drivers/net/usb/hso.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Driver for Option High Speed Mobile Devices.
   5  *
   6  *  Copyright (C) 2008 Option International
   7  *                     Filip Aben <[email protected]>
   8  *                     Denis Joseph Barrow <[email protected]>
   9  *                     Jan Dumon <[email protected]>
  10  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  11  *                      <[email protected]>
  12  *  Copyright (C) 2008 Greg Kroah-Hartman <[email protected]>
  13  *  Copyright (C) 2008 Novell, Inc.
  14  *
  15  *****************************************************************************/
  16
  17 /******************************************************************************
  18  *
  19  * Description of the device:
  20  *
  21  * Interface 0: Contains the IP network interface on the bulk end points.
  22  *              The multiplexed serial ports are using the interrupt and
  23  *              control endpoints.
  24  *              Interrupt contains a bitmap telling which multiplexed
  25  *              serialport needs servicing.
  26  *
  27  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
  28  *              port is opened, as this have a huge impact on the network port
  29  *              throughput.
  30  *
  31  * Interface 2: Standard modem interface - circuit switched interface, this
  32  *              can be used to make a standard ppp connection however it
  33  *              should not be used in conjunction with the IP network interface
  34  *              enabled for USB performance reasons i.e. if using this set
  35  *              ideally disable_net=1.
  36  *
  37  *****************************************************************************/
  38
  39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  40
  41 #include <linux/sched/signal.h>
  42 #include <linux/slab.h>
  43 #include <linux/init.h>
  44 #include <linux/delay.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/module.h>
  47 #include <linux/ethtool.h>
  48 #include <linux/usb.h>
  49 #include <linux/tty.h>
  50 #include <linux/tty_driver.h>
  51 #include <linux/tty_flip.h>
  52 #include <linux/kmod.h>
  53 #include <linux/rfkill.h>
  54 #include <linux/ip.h>
  55 #include <linux/uaccess.h>
  56 #include <linux/usb/cdc.h>
  57 #include <net/arp.h>
  58 #include <asm/byteorder.h>
  59 #include <linux/serial_core.h>
  60 #include <linux/serial.h>
  61
  62
  63 #define MOD_AUTHOR                      "Option Wireless"
  64 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
  65
  66 #define HSO_MAX_NET_DEVICES             10
  67 #define HSO__MAX_MTU                    2048
  68 #define DEFAULT_MTU                     1500
  69 #define DEFAULT_MRU                     1500
  70
  71 #define CTRL_URB_RX_SIZE                1024
  72 #define CTRL_URB_TX_SIZE                64
  73
  74 #define BULK_URB_RX_SIZE                4096
  75 #define BULK_URB_TX_SIZE                8192
  76
  77 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
  78 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
  79 #define MUX_BULK_RX_BUF_COUNT           4
  80 #define USB_TYPE_OPTION_VENDOR          0x20
  81
  82 /* These definitions are used with the struct hso_net flags element */
  83 /* - use *_bit operations on it. (bit indices not values.) */
  84 #define HSO_NET_RUNNING                 0
  85
  86 #define HSO_NET_TX_TIMEOUT              (HZ*10)
  87
  88 #define HSO_SERIAL_MAGIC                0x48534f31
  89
  90 /* Number of ttys to handle */
  91 #define HSO_SERIAL_TTY_MINORS           256
  92
  93 #define MAX_RX_URBS                     2
  94
  95 /*****************************************************************************/
  96 /* Debugging functions                                                       */
  97 /*****************************************************************************/
  98 #define hso_dbg(lvl, fmt, ...)                                          \
  99 do {                                                                    \
 100         if ((lvl) & debug)                                              \
 101                 pr_info("[%d:%s] " fmt,                                 \
 102                         __LINE__, __func__, ##__VA_ARGS__);             \
 103 } while (0)
 104
 105 /*****************************************************************************/
 106 /* Enumerators                                                               */
 107 /*****************************************************************************/
 108 enum pkt_parse_state {
 109         WAIT_IP,
 110         WAIT_DATA,
 111         WAIT_SYNC
 112 };
 113
 114 /*****************************************************************************/
 115 /* Structs                                                                   */
 116 /*****************************************************************************/
 117
 118 struct hso_shared_int {
 119         struct usb_endpoint_descriptor *intr_endp;
 120         void *shared_intr_buf;
 121         struct urb *shared_intr_urb;
 122         struct usb_device *usb;
 123         int use_count;
 124         int ref_count;
 125         struct mutex shared_int_lock;
 126 };
 127
 128 struct hso_net {
 129         struct hso_device *parent;
 130         struct net_device *net;
 131         struct rfkill *rfkill;
 132         char name[24];
 133
 134         struct usb_endpoint_descriptor *in_endp;
 135         struct usb_endpoint_descriptor *out_endp;
 136
 137         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
 138         struct urb *mux_bulk_tx_urb;
 139         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
 140         void *mux_bulk_tx_buf;
 141
 142         struct sk_buff *skb_rx_buf;
 143         struct sk_buff *skb_tx_buf;
 144
 145         enum pkt_parse_state rx_parse_state;
 146         spinlock_t net_lock;
 147
 148         unsigned short rx_buf_size;
 149         unsigned short rx_buf_missing;
 150         struct iphdr rx_ip_hdr;
 151
 152         unsigned long flags;
 153 };
 154
 155 enum rx_ctrl_state{
 156         RX_IDLE,
 157         RX_SENT,
 158         RX_PENDING
 159 };
 160
 161 #define BM_REQUEST_TYPE (0xa1)
 162 #define B_NOTIFICATION  (0x20)
 163 #define W_VALUE         (0x0)
 164 #define W_LENGTH        (0x2)
 165
 166 #define B_OVERRUN       (0x1<<6)
 167 #define B_PARITY        (0x1<<5)
 168 #define B_FRAMING       (0x1<<4)
 169 #define B_RING_SIGNAL   (0x1<<3)
 170 #define B_BREAK         (0x1<<2)
 171 #define B_TX_CARRIER    (0x1<<1)
 172 #define B_RX_CARRIER    (0x1<<0)
 173
 174 struct hso_serial_state_notification {
 175         u8 bmRequestType;
 176         u8 bNotification;
 177         u16 wValue;
 178         u16 wIndex;
 179         u16 wLength;
 180         u16 UART_state_bitmap;
 181 } __packed;
 182
 183 struct hso_tiocmget {
 184         struct mutex mutex;
 185         wait_queue_head_t waitq;
 186         int    intr_completed;
 187         struct usb_endpoint_descriptor *endp;
 188         struct urb *urb;
 189         struct hso_serial_state_notification *serial_state_notification;
 190         u16    prev_UART_state_bitmap;
 191         struct uart_icount icount;
 192 };
 193
 194
 195 struct hso_serial {
 196         struct hso_device *parent;
 197         int magic;
 198         u8 minor;
 199
 200         struct hso_shared_int *shared_int;
 201
 202         /* rx/tx urb could be either a bulk urb or a control urb depending
 203            on which serial port it is used on. */
 204         struct urb *rx_urb[MAX_RX_URBS];
 205         u8 num_rx_urbs;
 206         u8 *rx_data[MAX_RX_URBS];
 207         u16 rx_data_length;     /* should contain allocated length */
 208
 209         struct urb *tx_urb;
 210         u8 *tx_data;
 211         u8 *tx_buffer;
 212         u16 tx_data_length;     /* should contain allocated length */
 213         u16 tx_data_count;
 214         u16 tx_buffer_count;
 215         struct usb_ctrlrequest ctrl_req_tx;
 216         struct usb_ctrlrequest ctrl_req_rx;
 217
 218         struct usb_endpoint_descriptor *in_endp;
 219         struct usb_endpoint_descriptor *out_endp;
 220
 221         enum rx_ctrl_state rx_state;
 222         u8 rts_state;
 223         u8 dtr_state;
 224         unsigned tx_urb_used:1;
 225
 226         struct tty_port port;
 227         /* from usb_serial_port */
 228         spinlock_t serial_lock;
 229
 230         int (*write_data) (struct hso_serial *serial);
 231         struct hso_tiocmget  *tiocmget;
 232         /* Hacks required to get flow control
 233          * working on the serial receive buffers
 234          * so as not to drop characters on the floor.
 235          */
 236         int  curr_rx_urb_idx;
 237         u8   rx_urb_filled[MAX_RX_URBS];
 238         struct tasklet_struct unthrottle_tasklet;
 239 };
 240
 241 struct hso_device {
 242         union {
 243                 struct hso_serial *dev_serial;
 244                 struct hso_net *dev_net;
 245         } port_data;
 246
 247         u32 port_spec;
 248
 249         u8 is_active;
 250         u8 usb_gone;
 251         struct work_struct async_get_intf;
 252         struct work_struct async_put_intf;
 253
 254         struct usb_device *usb;
 255         struct usb_interface *interface;
 256
 257         struct device *dev;
 258         struct kref ref;
 259         struct mutex mutex;
 260 };
 261
 262 /* Type of interface */
 263 #define HSO_INTF_MASK           0xFF00
 264 #define HSO_INTF_MUX            0x0100
 265 #define HSO_INTF_BULK           0x0200
 266
 267 /* Type of port */
 268 #define HSO_PORT_MASK           0xFF
 269 #define HSO_PORT_NO_PORT        0x0
 270 #define HSO_PORT_CONTROL        0x1
 271 #define HSO_PORT_APP            0x2
 272 #define HSO_PORT_GPS            0x3
 273 #define HSO_PORT_PCSC           0x4
 274 #define HSO_PORT_APP2           0x5
 275 #define HSO_PORT_GPS_CONTROL    0x6
 276 #define HSO_PORT_MSD            0x7
 277 #define HSO_PORT_VOICE          0x8
 278 #define HSO_PORT_DIAG2          0x9
 279 #define HSO_PORT_DIAG           0x10
 280 #define HSO_PORT_MODEM          0x11
 281 #define HSO_PORT_NETWORK        0x12
 282
 283 /* Additional device info */
 284 #define HSO_INFO_MASK           0xFF000000
 285 #define HSO_INFO_CRC_BUG        0x01000000
 286
 287 /*****************************************************************************/
 288 /* Prototypes                                                                */
 289 /*****************************************************************************/
 290 /* Serial driver functions */
 291 static int hso_serial_tiocmset(struct tty_struct *tty,
 292                                unsigned int set, unsigned int clear);
 293 static void ctrl_callback(struct urb *urb);
 294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
 295 static void hso_kick_transmit(struct hso_serial *serial);
 296 /* Helper functions */
 297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
 298                                    struct usb_device *usb, gfp_t gfp);
 299 static void handle_usb_error(int status, const char *function,
 300                              struct hso_device *hso_dev);
 301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
 302                                                   int type, int dir);
 303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
 304 static void hso_free_interface(struct usb_interface *intf);
 305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
 306 static int hso_stop_serial_device(struct hso_device *hso_dev);
 307 static int hso_start_net_device(struct hso_device *hso_dev);
 308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
 309 static int hso_stop_net_device(struct hso_device *hso_dev);
 310 static void hso_serial_ref_free(struct kref *ref);
 311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
 312 static int hso_mux_serial_read(struct hso_serial *serial);
 313 static void async_get_intf(struct work_struct *data);
 314 static void async_put_intf(struct work_struct *data);
 315 static int hso_put_activity(struct hso_device *hso_dev);
 316 static int hso_get_activity(struct hso_device *hso_dev);
 317 static void tiocmget_intr_callback(struct urb *urb);
 318 /*****************************************************************************/
 319 /* Helping functions                                                         */
 320 /*****************************************************************************/
 321
 322 /* #define DEBUG */
 323
 324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
 325 {
 326         return hso_dev->port_data.dev_net;
 327 }
 328
 329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
 330 {
 331         return hso_dev->port_data.dev_serial;
 332 }
 333
 334 /* Debugging functions */
 335 #ifdef DEBUG
 336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
 337                      unsigned int len)
 338 {
 339         static char name[255];
 340
 341         sprintf(name, "hso[%d:%s]", line_count, func_name);
 342         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
 343 }
 344
 345 #define DUMP(buf_, len_)        \
 346         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
 347
 348 #define DUMP1(buf_, len_)                       \
 349         do {                                    \
 350                 if (0x01 & debug)               \
 351                         DUMP(buf_, len_);       \
 352         } while (0)
 353 #else
 354 #define DUMP(buf_, len_)
 355 #define DUMP1(buf_, len_)
 356 #endif
 357
 358 /* module parameters */
 359 static int debug;
 360 static int tty_major;
 361 static int disable_net;
 362
 363 /* driver info */
 364 static const char driver_name[] = "hso";
 365 static const char tty_filename[] = "ttyHS";
 366 static const char *version = __FILE__ ": " MOD_AUTHOR;
 367 /* the usb driver itself (registered in hso_init) */
 368 static struct usb_driver hso_driver;
 369 /* serial structures */
 370 static struct tty_driver *tty_drv;
 371 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
 372 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
 373 static DEFINE_SPINLOCK(serial_table_lock);
 374
 375 static const s32 default_port_spec[] = {
 376         HSO_INTF_MUX | HSO_PORT_NETWORK,
 377         HSO_INTF_BULK | HSO_PORT_DIAG,
 378         HSO_INTF_BULK | HSO_PORT_MODEM,
 379         0
 380 };
 381
 382 static const s32 icon321_port_spec[] = {
 383         HSO_INTF_MUX | HSO_PORT_NETWORK,
 384         HSO_INTF_BULK | HSO_PORT_DIAG2,
 385         HSO_INTF_BULK | HSO_PORT_MODEM,
 386         HSO_INTF_BULK | HSO_PORT_DIAG,
 387         0
 388 };
 389
 390 #define default_port_device(vendor, product)    \
 391         USB_DEVICE(vendor, product),    \
 392                 .driver_info = (kernel_ulong_t)default_port_spec
 393
 394 #define icon321_port_device(vendor, product)    \
 395         USB_DEVICE(vendor, product),    \
 396                 .driver_info = (kernel_ulong_t)icon321_port_spec
 397
 398 /* list of devices we support */
 399 static const struct usb_device_id hso_ids[] = {
 400         {default_port_device(0x0af0, 0x6711)},
 401         {default_port_device(0x0af0, 0x6731)},
 402         {default_port_device(0x0af0, 0x6751)},
 403         {default_port_device(0x0af0, 0x6771)},
 404         {default_port_device(0x0af0, 0x6791)},
 405         {default_port_device(0x0af0, 0x6811)},
 406         {default_port_device(0x0af0, 0x6911)},
 407         {default_port_device(0x0af0, 0x6951)},
 408         {default_port_device(0x0af0, 0x6971)},
 409         {default_port_device(0x0af0, 0x7011)},
 410         {default_port_device(0x0af0, 0x7031)},
 411         {default_port_device(0x0af0, 0x7051)},
 412         {default_port_device(0x0af0, 0x7071)},
 413         {default_port_device(0x0af0, 0x7111)},
 414         {default_port_device(0x0af0, 0x7211)},
 415         {default_port_device(0x0af0, 0x7251)},
 416         {default_port_device(0x0af0, 0x7271)},
 417         {default_port_device(0x0af0, 0x7311)},
 418         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
 419         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
 420         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
 421         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
 422         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
 423         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
 424         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
 425         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
 426         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
 427         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
 428         {USB_DEVICE(0x0af0, 0x7701)},
 429         {USB_DEVICE(0x0af0, 0x7706)},
 430         {USB_DEVICE(0x0af0, 0x7801)},
 431         {USB_DEVICE(0x0af0, 0x7901)},
 432         {USB_DEVICE(0x0af0, 0x7A01)},
 433         {USB_DEVICE(0x0af0, 0x7A05)},
 434         {USB_DEVICE(0x0af0, 0x8200)},
 435         {USB_DEVICE(0x0af0, 0x8201)},
 436         {USB_DEVICE(0x0af0, 0x8300)},
 437         {USB_DEVICE(0x0af0, 0x8302)},
 438         {USB_DEVICE(0x0af0, 0x8304)},
 439         {USB_DEVICE(0x0af0, 0x8400)},
 440         {USB_DEVICE(0x0af0, 0x8600)},
 441         {USB_DEVICE(0x0af0, 0x8800)},
 442         {USB_DEVICE(0x0af0, 0x8900)},
 443         {USB_DEVICE(0x0af0, 0x9000)},
 444         {USB_DEVICE(0x0af0, 0x9200)},           /* Option GTM671WFS */
 445         {USB_DEVICE(0x0af0, 0xd035)},
 446         {USB_DEVICE(0x0af0, 0xd055)},
 447         {USB_DEVICE(0x0af0, 0xd155)},
 448         {USB_DEVICE(0x0af0, 0xd255)},
 449         {USB_DEVICE(0x0af0, 0xd057)},
 450         {USB_DEVICE(0x0af0, 0xd157)},
 451         {USB_DEVICE(0x0af0, 0xd257)},
 452         {USB_DEVICE(0x0af0, 0xd357)},
 453         {USB_DEVICE(0x0af0, 0xd058)},
 454         {USB_DEVICE(0x0af0, 0xc100)},
 455         {}
 456 };
 457 MODULE_DEVICE_TABLE(usb, hso_ids);
 458
 459 /* Sysfs attribute */
 460 static ssize_t hsotype_show(struct device *dev,
 461                             struct device_attribute *attr, char *buf)
 462 {
 463         struct hso_device *hso_dev = dev_get_drvdata(dev);
 464         char *port_name;
 465
 466         if (!hso_dev)
 467                 return 0;
 468
 469         switch (hso_dev->port_spec & HSO_PORT_MASK) {
 470         case HSO_PORT_CONTROL:
 471                 port_name = "Control";
 472                 break;
 473         case HSO_PORT_APP:
 474                 port_name = "Application";
 475                 break;
 476         case HSO_PORT_APP2:
 477                 port_name = "Application2";
 478                 break;
 479         case HSO_PORT_GPS:
 480                 port_name = "GPS";
 481                 break;
 482         case HSO_PORT_GPS_CONTROL:
 483                 port_name = "GPS Control";
 484                 break;
 485         case HSO_PORT_PCSC:
 486                 port_name = "PCSC";
 487                 break;
 488         case HSO_PORT_DIAG:
 489                 port_name = "Diagnostic";
 490                 break;
 491         case HSO_PORT_DIAG2:
 492                 port_name = "Diagnostic2";
 493                 break;
 494         case HSO_PORT_MODEM:
 495                 port_name = "Modem";
 496                 break;
 497         case HSO_PORT_NETWORK:
 498                 port_name = "Network";
 499                 break;
 500         default:
 501                 port_name = "Unknown";
 502                 break;
 503         }
 504
 505         return sprintf(buf, "%s\n", port_name);
 506 }
 507 static DEVICE_ATTR_RO(hsotype);
 508
 509 static struct attribute *hso_serial_dev_attrs[] = {
 510         &dev_attr_hsotype.attr,
 511         NULL
 512 };
 513
 514 ATTRIBUTE_GROUPS(hso_serial_dev);
 515
 516 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
 517 {
 518         int idx;
 519
 520         for (idx = 0; idx < serial->num_rx_urbs; idx++)
 521                 if (serial->rx_urb[idx] == urb)
 522                         return idx;
 523         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
 524         return -1;
 525 }
 526
 527 /* converts mux value to a port spec value */
 528 static u32 hso_mux_to_port(int mux)
 529 {
 530         u32 result;
 531
 532         switch (mux) {
 533         case 0x1:
 534                 result = HSO_PORT_CONTROL;
 535                 break;
 536         case 0x2:
 537                 result = HSO_PORT_APP;
 538                 break;
 539         case 0x4:
 540                 result = HSO_PORT_PCSC;
 541                 break;
 542         case 0x8:
 543                 result = HSO_PORT_GPS;
 544                 break;
 545         case 0x10:
 546                 result = HSO_PORT_APP2;
 547                 break;
 548         default:
 549                 result = HSO_PORT_NO_PORT;
 550         }
 551         return result;
 552 }
 553
 554 /* converts port spec value to a mux value */
 555 static u32 hso_port_to_mux(int port)
 556 {
 557         u32 result;
 558
 559         switch (port & HSO_PORT_MASK) {
 560         case HSO_PORT_CONTROL:
 561                 result = 0x0;
 562                 break;
 563         case HSO_PORT_APP:
 564                 result = 0x1;
 565                 break;
 566         case HSO_PORT_PCSC:
 567                 result = 0x2;
 568                 break;
 569         case HSO_PORT_GPS:
 570                 result = 0x3;
 571                 break;
 572         case HSO_PORT_APP2:
 573                 result = 0x4;
 574                 break;
 575         default:
 576                 result = 0x0;
 577         }
 578         return result;
 579 }
 580
 581 static struct hso_serial *get_serial_by_shared_int_and_type(
 582                                         struct hso_shared_int *shared_int,
 583                                         int mux)
 584 {
 585         int i, port;
 586
 587         port = hso_mux_to_port(mux);
 588
 589         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
 590                 if (serial_table[i] &&
 591                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
 592                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
 593                         return dev2ser(serial_table[i]);
 594                 }
 595         }
 596
 597         return NULL;
 598 }
 599
 600 static struct hso_serial *get_serial_by_index(unsigned index)
 601 {
 602         struct hso_serial *serial = NULL;
 603         unsigned long flags;
 604
 605         spin_lock_irqsave(&serial_table_lock, flags);
 606         if (serial_table[index])
 607                 serial = dev2ser(serial_table[index]);
 608         spin_unlock_irqrestore(&serial_table_lock, flags);
 609
 610         return serial;
 611 }
 612
 613 static int obtain_minor(struct hso_serial *serial)
 614 {
 615         int index;
 616         unsigned long flags;
 617
 618         spin_lock_irqsave(&serial_table_lock, flags);
 619         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
 620                 if (serial_table[index] == NULL) {
 621                         serial_table[index] = serial->parent;
 622                         serial->minor = index;
 623                         spin_unlock_irqrestore(&serial_table_lock, flags);
 624                         return 0;
 625                 }
 626         }
 627         spin_unlock_irqrestore(&serial_table_lock, flags);
 628
 629         pr_err("%s: no free serial devices in table\n", __func__);
 630         return -1;
 631 }
 632
 633 static void release_minor(struct hso_serial *serial)
 634 {
 635         unsigned long flags;
 636
 637         spin_lock_irqsave(&serial_table_lock, flags);
 638         serial_table[serial->minor] = NULL;
 639         spin_unlock_irqrestore(&serial_table_lock, flags);
 640 }
 641
 642 static void handle_usb_error(int status, const char *function,
 643                              struct hso_device *hso_dev)
 644 {
 645         char *explanation;
 646
 647         switch (status) {
 648         case -ENODEV:
 649                 explanation = "no device";
 650                 break;
 651         case -ENOENT:
 652                 explanation = "endpoint not enabled";
 653                 break;
 654         case -EPIPE:
 655                 explanation = "endpoint stalled";
 656                 break;
 657         case -ENOSPC:
 658                 explanation = "not enough bandwidth";
 659                 break;
 660         case -ESHUTDOWN:
 661                 explanation = "device disabled";
 662                 break;
 663         case -EHOSTUNREACH:
 664                 explanation = "device suspended";
 665                 break;
 666         case -EINVAL:
 667         case -EAGAIN:
 668         case -EFBIG:
 669         case -EMSGSIZE:
 670                 explanation = "internal error";
 671                 break;
 672         case -EILSEQ:
 673         case -EPROTO:
 674         case -ETIME:
 675         case -ETIMEDOUT:
 676                 explanation = "protocol error";
 677                 if (hso_dev)
 678                         usb_queue_reset_device(hso_dev->interface);
 679                 break;
 680         default:
 681                 explanation = "unknown status";
 682                 break;
 683         }
 684
 685         /* log a meaningful explanation of an USB status */
 686         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
 687                 function, explanation, status);
 688 }
 689
 690 /* Network interface functions */
 691
 692 /* called when net interface is brought up by ifconfig */
 693 static int hso_net_open(struct net_device *net)
 694 {
 695         struct hso_net *odev = netdev_priv(net);
 696         unsigned long flags = 0;
 697
 698         if (!odev) {
 699                 dev_err(&net->dev, "No net device !\n");
 700                 return -ENODEV;
 701         }
 702
 703         odev->skb_tx_buf = NULL;
 704
 705         /* setup environment */
 706         spin_lock_irqsave(&odev->net_lock, flags);
 707         odev->rx_parse_state = WAIT_IP;
 708         odev->rx_buf_size = 0;
 709         odev->rx_buf_missing = sizeof(struct iphdr);
 710         spin_unlock_irqrestore(&odev->net_lock, flags);
 711
 712         /* We are up and running. */
 713         set_bit(HSO_NET_RUNNING, &odev->flags);
 714         hso_start_net_device(odev->parent);
 715
 716         /* Tell the kernel we are ready to start receiving from it */
 717         netif_start_queue(net);
 718
 719         return 0;
 720 }
 721
 722 /* called when interface is brought down by ifconfig */
 723 static int hso_net_close(struct net_device *net)
 724 {
 725         struct hso_net *odev = netdev_priv(net);
 726
 727         /* we don't need the queue anymore */
 728         netif_stop_queue(net);
 729         /* no longer running */
 730         clear_bit(HSO_NET_RUNNING, &odev->flags);
 731
 732         hso_stop_net_device(odev->parent);
 733
 734         /* done */
 735         return 0;
 736 }
 737
 738 /* USB tells is xmit done, we should start the netqueue again */
 739 static void write_bulk_callback(struct urb *urb)
 740 {
 741         struct hso_net *odev = urb->context;
 742         int status = urb->status;
 743
 744         /* Sanity check */
 745         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 746                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
 747                 return;
 748         }
 749
 750         /* Do we still have a valid kernel network device? */
 751         if (!netif_device_present(odev->net)) {
 752                 dev_err(&urb->dev->dev, "%s: net device not present\n",
 753                         __func__);
 754                 return;
 755         }
 756
 757         /* log status, but don't act on it, we don't need to resubmit anything
 758          * anyhow */
 759         if (status)
 760                 handle_usb_error(status, __func__, odev->parent);
 761
 762         hso_put_activity(odev->parent);
 763
 764         /* Tell the network interface we are ready for another frame */
 765         netif_wake_queue(odev->net);
 766 }
 767
 768 /* called by kernel when we need to transmit a packet */
 769 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
 770                                             struct net_device *net)
 771 {
 772         struct hso_net *odev = netdev_priv(net);
 773         int result;
 774
 775         /* Tell the kernel, "No more frames 'til we are done with this one." */
 776         netif_stop_queue(net);
 777         if (hso_get_activity(odev->parent) == -EAGAIN) {
 778                 odev->skb_tx_buf = skb;
 779                 return NETDEV_TX_OK;
 780         }
 781
 782         /* log if asked */
 783         DUMP1(skb->data, skb->len);
 784         /* Copy it from kernel memory to OUR memory */
 785         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
 786         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
 787
 788         /* Fill in the URB for shipping it out. */
 789         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
 790                           odev->parent->usb,
 791                           usb_sndbulkpipe(odev->parent->usb,
 792                                           odev->out_endp->
 793                                           bEndpointAddress & 0x7F),
 794                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
 795                           odev);
 796
 797         /* Deal with the Zero Length packet problem, I hope */
 798         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
 799
 800         /* Send the URB on its merry way. */
 801         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
 802         if (result) {
 803                 dev_warn(&odev->parent->interface->dev,
 804                         "failed mux_bulk_tx_urb %d\n", result);
 805                 net->stats.tx_errors++;
 806                 netif_start_queue(net);
 807         } else {
 808                 net->stats.tx_packets++;
 809                 net->stats.tx_bytes += skb->len;
 810         }
 811         dev_kfree_skb(skb);
 812         /* we're done */
 813         return NETDEV_TX_OK;
 814 }
 815
 816 static const struct ethtool_ops ops = {
 817         .get_link = ethtool_op_get_link
 818 };
 819
 820 /* called when a packet did not ack after watchdogtimeout */
 821 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
 822 {
 823         struct hso_net *odev = netdev_priv(net);
 824
 825         if (!odev)
 826                 return;
 827
 828         /* Tell syslog we are hosed. */
 829         dev_warn(&net->dev, "Tx timed out.\n");
 830
 831         /* Tear the waiting frame off the list */
 832         if (odev->mux_bulk_tx_urb)
 833                 usb_unlink_urb(odev->mux_bulk_tx_urb);
 834
 835         /* Update statistics */
 836         net->stats.tx_errors++;
 837 }
 838
 839 /* make a real packet from the received USB buffer */
 840 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
 841                         unsigned int count, unsigned char is_eop)
 842 {
 843         unsigned short temp_bytes;
 844         unsigned short buffer_offset = 0;
 845         unsigned short frame_len;
 846
 847         /* log if needed */
 848         hso_dbg(0x1, "Rx %d bytes\n", count);
 849         DUMP(ip_pkt, min(128, (int)count));
 850
 851         while (count) {
 852                 switch (odev->rx_parse_state) {
 853                 case WAIT_IP:
 854                         /* waiting for IP header. */
 855                         /* wanted bytes - size of ip header */
 856                         temp_bytes =
 857                             (count <
 858                              odev->rx_buf_missing) ? count : odev->
 859                             rx_buf_missing;
 860
 861                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
 862                                odev->rx_buf_size, ip_pkt + buffer_offset,
 863                                temp_bytes);
 864
 865                         odev->rx_buf_size += temp_bytes;
 866                         buffer_offset += temp_bytes;
 867                         odev->rx_buf_missing -= temp_bytes;
 868                         count -= temp_bytes;
 869
 870                         if (!odev->rx_buf_missing) {
 871                                 /* header is complete allocate an sk_buffer and
 872                                  * continue to WAIT_DATA */
 873                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
 874
 875                                 if ((frame_len > DEFAULT_MRU) ||
 876                                     (frame_len < sizeof(struct iphdr))) {
 877                                         dev_err(&odev->net->dev,
 878                                                 "Invalid frame (%d) length\n",
 879                                                 frame_len);
 880                                         odev->rx_parse_state = WAIT_SYNC;
 881                                         continue;
 882                                 }
 883                                 /* Allocate an sk_buff */
 884                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
 885                                                                     frame_len);
 886                                 if (!odev->skb_rx_buf) {
 887                                         /* We got no receive buffer. */
 888                                         hso_dbg(0x1, "could not allocate memory\n");
 889                                         odev->rx_parse_state = WAIT_SYNC;
 890                                         continue;
 891                                 }
 892
 893                                 /* Copy what we got so far. make room for iphdr
 894                                  * after tail. */
 895                                 skb_put_data(odev->skb_rx_buf,
 896                                              (char *)&(odev->rx_ip_hdr),
 897                                              sizeof(struct iphdr));
 898
 899                                 /* ETH_HLEN */
 900                                 odev->rx_buf_size = sizeof(struct iphdr);
 901
 902                                 /* Filip actually use .tot_len */
 903                                 odev->rx_buf_missing =
 904                                     frame_len - sizeof(struct iphdr);
 905                                 odev->rx_parse_state = WAIT_DATA;
 906                         }
 907                         break;
 908
 909                 case WAIT_DATA:
 910                         temp_bytes = (count < odev->rx_buf_missing)
 911                                         ? count : odev->rx_buf_missing;
 912
 913                         /* Copy the rest of the bytes that are left in the
 914                          * buffer into the waiting sk_buf. */
 915                         /* Make room for temp_bytes after tail. */
 916                         skb_put_data(odev->skb_rx_buf,
 917                                      ip_pkt + buffer_offset,
 918                                      temp_bytes);
 919
 920                         odev->rx_buf_missing -= temp_bytes;
 921                         count -= temp_bytes;
 922                         buffer_offset += temp_bytes;
 923                         odev->rx_buf_size += temp_bytes;
 924                         if (!odev->rx_buf_missing) {
 925                                 /* Packet is complete. Inject into stack. */
 926                                 /* We have IP packet here */
 927                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
 928                                 skb_reset_mac_header(odev->skb_rx_buf);
 929
 930                                 /* Ship it off to the kernel */
 931                                 netif_rx(odev->skb_rx_buf);
 932                                 /* No longer our buffer. */
 933                                 odev->skb_rx_buf = NULL;
 934
 935                                 /* update out statistics */
 936                                 odev->net->stats.rx_packets++;
 937
 938                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
 939
 940                                 odev->rx_buf_size = 0;
 941                                 odev->rx_buf_missing = sizeof(struct iphdr);
 942                                 odev->rx_parse_state = WAIT_IP;
 943                         }
 944                         break;
 945
 946                 case WAIT_SYNC:
 947                         hso_dbg(0x1, " W_S\n");
 948                         count = 0;
 949                         break;
 950                 default:
 951                         hso_dbg(0x1, "\n");
 952                         count--;
 953                         break;
 954                 }
 955         }
 956
 957         /* Recovery mechanism for WAIT_SYNC state. */
 958         if (is_eop) {
 959                 if (odev->rx_parse_state == WAIT_SYNC) {
 960                         odev->rx_parse_state = WAIT_IP;
 961                         odev->rx_buf_size = 0;
 962                         odev->rx_buf_missing = sizeof(struct iphdr);
 963                 }
 964         }
 965 }
 966
 967 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
 968 {
 969         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
 970         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
 971
 972         if (((rest == 5) || (rest == 6)) &&
 973             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
 974                     crc_check, 4)) {
 975                 urb->actual_length -= 4;
 976         }
 977 }
 978
 979 /* Moving data from usb to kernel (in interrupt state) */
 980 static void read_bulk_callback(struct urb *urb)
 981 {
 982         struct hso_net *odev = urb->context;
 983         struct net_device *net;
 984         int result;
 985         unsigned long flags;
 986         int status = urb->status;
 987
 988         /* is al ok?  (Filip: Who's Al ?) */
 989         if (status) {
 990                 handle_usb_error(status, __func__, odev->parent);
 991                 return;
 992         }
 993
 994         /* Sanity check */
 995         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 996                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
 997                 return;
 998         }
 999         usb_mark_last_busy(urb->dev);
1000
1001         net = odev->net;
1002
1003         if (!netif_device_present(net)) {
1004                 /* Somebody killed our network interface... */
1005                 return;
1006         }
1007
1008         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1009                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1010
1011         /* do we even have a packet? */
1012         if (urb->actual_length) {
1013                 /* Handle the IP stream, add header and push it onto network
1014                  * stack if the packet is complete. */
1015                 spin_lock_irqsave(&odev->net_lock, flags);
1016                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1017                             (urb->transfer_buffer_length >
1018                              urb->actual_length) ? 1 : 0);
1019                 spin_unlock_irqrestore(&odev->net_lock, flags);
1020         }
1021
1022         /* We are done with this URB, resubmit it. Prep the USB to wait for
1023          * another frame. Reuse same as received. */
1024         usb_fill_bulk_urb(urb,
1025                           odev->parent->usb,
1026                           usb_rcvbulkpipe(odev->parent->usb,
1027                                           odev->in_endp->
1028                                           bEndpointAddress & 0x7F),
1029                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1030                           read_bulk_callback, odev);
1031
1032         /* Give this to the USB subsystem so it can tell us when more data
1033          * arrives. */
1034         result = usb_submit_urb(urb, GFP_ATOMIC);
1035         if (result)
1036                 dev_warn(&odev->parent->interface->dev,
1037                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1038                          result);
1039 }
1040
1041 /* Serial driver functions */
1042
1043 static void hso_init_termios(struct ktermios *termios)
1044 {
1045         /*
1046          * The default requirements for this device are:
1047          */
1048         termios->c_iflag &=
1049                 ~(IGNBRK        /* disable ignore break */
1050                 | BRKINT        /* disable break causes interrupt */
1051                 | PARMRK        /* disable mark parity errors */
1052                 | ISTRIP        /* disable clear high bit of input characters */
1053                 | INLCR         /* disable translate NL to CR */
1054                 | IGNCR         /* disable ignore CR */
1055                 | ICRNL         /* disable translate CR to NL */
1056                 | IXON);        /* disable enable XON/XOFF flow control */
1057
1058         /* disable postprocess output characters */
1059         termios->c_oflag &= ~OPOST;
1060
1061         termios->c_lflag &=
1062                 ~(ECHO          /* disable echo input characters */
1063                 | ECHONL        /* disable echo new line */
1064                 | ICANON        /* disable erase, kill, werase, and rprnt
1065                                    special characters */
1066                 | ISIG          /* disable interrupt, quit, and suspend special
1067                                    characters */
1068                 | IEXTEN);      /* disable non-POSIX special characters */
1069
1070         termios->c_cflag &=
1071                 ~(CSIZE         /* no size */
1072                 | PARENB        /* disable parity bit */
1073                 | CBAUD         /* clear current baud rate */
1074                 | CBAUDEX);     /* clear current buad rate */
1075
1076         termios->c_cflag |= CS8;        /* character size 8 bits */
1077
1078         /* baud rate 115200 */
1079         tty_termios_encode_baud_rate(termios, 115200, 115200);
1080 }
1081
1082 static void _hso_serial_set_termios(struct tty_struct *tty,
1083                                     struct ktermios *old)
1084 {
1085         struct hso_serial *serial = tty->driver_data;
1086
1087         if (!serial) {
1088                 pr_err("%s: no tty structures", __func__);
1089                 return;
1090         }
1091
1092         hso_dbg(0x8, "port %d\n", serial->minor);
1093
1094         /*
1095          *      Fix up unsupported bits
1096          */
1097         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1098
1099         tty->termios.c_cflag &=
1100                 ~(CSIZE         /* no size */
1101                 | PARENB        /* disable parity bit */
1102                 | CBAUD         /* clear current baud rate */
1103                 | CBAUDEX);     /* clear current buad rate */
1104
1105         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1106
1107         /* baud rate 115200 */
1108         tty_encode_baud_rate(tty, 115200, 115200);
1109 }
1110
1111 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1112 {
1113         int result;
1114         /* We are done with this URB, resubmit it. Prep the USB to wait for
1115          * another frame */
1116         usb_fill_bulk_urb(urb, serial->parent->usb,
1117                           usb_rcvbulkpipe(serial->parent->usb,
1118                                           serial->in_endp->
1119                                           bEndpointAddress & 0x7F),
1120                           urb->transfer_buffer, serial->rx_data_length,
1121                           hso_std_serial_read_bulk_callback, serial);
1122         /* Give this to the USB subsystem so it can tell us when more data
1123          * arrives. */
1124         result = usb_submit_urb(urb, GFP_ATOMIC);
1125         if (result) {
1126                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1127                         __func__, result);
1128         }
1129 }
1130
1131
1132
1133
1134 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1135 {
1136         int count;
1137         struct urb *curr_urb;
1138
1139         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1140                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1141                 count = put_rxbuf_data(curr_urb, serial);
1142                 if (count == -1)
1143                         return;
1144                 if (count == 0) {
1145                         serial->curr_rx_urb_idx++;
1146                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1147                                 serial->curr_rx_urb_idx = 0;
1148                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1149                 }
1150         }
1151 }
1152
1153 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1154 {
1155         int count = 0;
1156         struct urb *urb;
1157
1158         urb = serial->rx_urb[0];
1159         if (serial->port.count > 0) {
1160                 count = put_rxbuf_data(urb, serial);
1161                 if (count == -1)
1162                         return;
1163         }
1164         /* Re issue a read as long as we receive data. */
1165
1166         if (count == 0 && ((urb->actual_length != 0) ||
1167                            (serial->rx_state == RX_PENDING))) {
1168                 serial->rx_state = RX_SENT;
1169                 hso_mux_serial_read(serial);
1170         } else
1171                 serial->rx_state = RX_IDLE;
1172 }
1173
1174
1175 /* read callback for Diag and CS port */
1176 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1177 {
1178         struct hso_serial *serial = urb->context;
1179         int status = urb->status;
1180         unsigned long flags;
1181
1182         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1183
1184         /* sanity check */
1185         if (!serial) {
1186                 hso_dbg(0x1, "serial == NULL\n");
1187                 return;
1188         }
1189         if (status) {
1190                 handle_usb_error(status, __func__, serial->parent);
1191                 return;
1192         }
1193
1194         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1195         DUMP1(urb->transfer_buffer, urb->actual_length);
1196
1197         /* Anyone listening? */
1198         if (serial->port.count == 0)
1199                 return;
1200
1201         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1202                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1203         /* Valid data, handle RX data */
1204         spin_lock_irqsave(&serial->serial_lock, flags);
1205         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1206         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1207         spin_unlock_irqrestore(&serial->serial_lock, flags);
1208 }
1209
1210 /*
1211  * This needs to be a tasklet otherwise we will
1212  * end up recursively calling this function.
1213  */
1214 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1215 {
1216         struct hso_serial *serial = from_tasklet(serial, t,
1217                                                  unthrottle_tasklet);
1218         unsigned long flags;
1219
1220         spin_lock_irqsave(&serial->serial_lock, flags);
1221         if ((serial->parent->port_spec & HSO_INTF_MUX))
1222                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1223         else
1224                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1225         spin_unlock_irqrestore(&serial->serial_lock, flags);
1226 }
1227
1228 static  void hso_unthrottle(struct tty_struct *tty)
1229 {
1230         struct hso_serial *serial = tty->driver_data;
1231
1232         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1233 }
1234
1235 /* open the requested serial port */
1236 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1237 {
1238         struct hso_serial *serial = get_serial_by_index(tty->index);
1239         int result;
1240
1241         /* sanity check */
1242         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1243                 WARN_ON(1);
1244                 tty->driver_data = NULL;
1245                 hso_dbg(0x1, "Failed to open port\n");
1246                 return -ENODEV;
1247         }
1248
1249         mutex_lock(&serial->parent->mutex);
1250         result = usb_autopm_get_interface(serial->parent->interface);
1251         if (result < 0)
1252                 goto err_out;
1253
1254         hso_dbg(0x1, "Opening %d\n", serial->minor);
1255
1256         /* setup */
1257         tty->driver_data = serial;
1258         tty_port_tty_set(&serial->port, tty);
1259
1260         /* check for port already opened, if not set the termios */
1261         serial->port.count++;
1262         if (serial->port.count == 1) {
1263                 serial->rx_state = RX_IDLE;
1264                 /* Force default termio settings */
1265                 _hso_serial_set_termios(tty, NULL);
1266                 tasklet_setup(&serial->unthrottle_tasklet,
1267                               hso_unthrottle_tasklet);
1268                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1269                 if (result) {
1270                         hso_stop_serial_device(serial->parent);
1271                         serial->port.count--;
1272                 } else {
1273                         kref_get(&serial->parent->ref);
1274                 }
1275         } else {
1276                 hso_dbg(0x1, "Port was already open\n");
1277         }
1278
1279         usb_autopm_put_interface(serial->parent->interface);
1280
1281         /* done */
1282         if (result)
1283                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1284 err_out:
1285         mutex_unlock(&serial->parent->mutex);
1286         return result;
1287 }
1288
1289 /* close the requested serial port */
1290 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1291 {
1292         struct hso_serial *serial = tty->driver_data;
1293         u8 usb_gone;
1294
1295         hso_dbg(0x1, "Closing serial port\n");
1296
1297         /* Open failed, no close cleanup required */
1298         if (serial == NULL)
1299                 return;
1300
1301         mutex_lock(&serial->parent->mutex);
1302         usb_gone = serial->parent->usb_gone;
1303
1304         if (!usb_gone)
1305                 usb_autopm_get_interface(serial->parent->interface);
1306
1307         /* reset the rts and dtr */
1308         /* do the actual close */
1309         serial->port.count--;
1310
1311         if (serial->port.count <= 0) {
1312                 serial->port.count = 0;
1313                 tty_port_tty_set(&serial->port, NULL);
1314                 if (!usb_gone)
1315                         hso_stop_serial_device(serial->parent);
1316                 tasklet_kill(&serial->unthrottle_tasklet);
1317         }
1318
1319         if (!usb_gone)
1320                 usb_autopm_put_interface(serial->parent->interface);
1321
1322         mutex_unlock(&serial->parent->mutex);
1323 }
1324
1325 /* close the requested serial port */
1326 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1327                             int count)
1328 {
1329         struct hso_serial *serial = tty->driver_data;
1330         int space, tx_bytes;
1331         unsigned long flags;
1332
1333         /* sanity check */
1334         if (serial == NULL) {
1335                 pr_err("%s: serial is NULL\n", __func__);
1336                 return -ENODEV;
1337         }
1338
1339         spin_lock_irqsave(&serial->serial_lock, flags);
1340
1341         space = serial->tx_data_length - serial->tx_buffer_count;
1342         tx_bytes = (count < space) ? count : space;
1343
1344         if (!tx_bytes)
1345                 goto out;
1346
1347         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1348         serial->tx_buffer_count += tx_bytes;
1349
1350 out:
1351         spin_unlock_irqrestore(&serial->serial_lock, flags);
1352
1353         hso_kick_transmit(serial);
1354         /* done */
1355         return tx_bytes;
1356 }
1357
1358 /* how much room is there for writing */
1359 static int hso_serial_write_room(struct tty_struct *tty)
1360 {
1361         struct hso_serial *serial = tty->driver_data;
1362         int room;
1363         unsigned long flags;
1364
1365         spin_lock_irqsave(&serial->serial_lock, flags);
1366         room = serial->tx_data_length - serial->tx_buffer_count;
1367         spin_unlock_irqrestore(&serial->serial_lock, flags);
1368
1369         /* return free room */
1370         return room;
1371 }
1372
1373 static void hso_serial_cleanup(struct tty_struct *tty)
1374 {
1375         struct hso_serial *serial = tty->driver_data;
1376
1377         if (!serial)
1378                 return;
1379
1380         kref_put(&serial->parent->ref, hso_serial_ref_free);
1381 }
1382
1383 /* setup the term */
1384 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1385 {
1386         struct hso_serial *serial = tty->driver_data;
1387         unsigned long flags;
1388
1389         if (old)
1390                 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1391                         (unsigned int)tty->termios.c_cflag,
1392                         (unsigned int)old->c_cflag);
1393
1394         /* the actual setup */
1395         spin_lock_irqsave(&serial->serial_lock, flags);
1396         if (serial->port.count)
1397                 _hso_serial_set_termios(tty, old);
1398         else
1399                 tty->termios = *old;
1400         spin_unlock_irqrestore(&serial->serial_lock, flags);
1401
1402         /* done */
1403 }
1404
1405 /* how many characters in the buffer */
1406 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1407 {
1408         struct hso_serial *serial = tty->driver_data;
1409         int chars;
1410         unsigned long flags;
1411
1412         /* sanity check */
1413         if (serial == NULL)
1414                 return 0;
1415
1416         spin_lock_irqsave(&serial->serial_lock, flags);
1417         chars = serial->tx_buffer_count;
1418         spin_unlock_irqrestore(&serial->serial_lock, flags);
1419
1420         return chars;
1421 }
1422 static int tiocmget_submit_urb(struct hso_serial *serial,
1423                                struct hso_tiocmget *tiocmget,
1424                                struct usb_device *usb)
1425 {
1426         int result;
1427
1428         if (serial->parent->usb_gone)
1429                 return -ENODEV;
1430         usb_fill_int_urb(tiocmget->urb, usb,
1431                          usb_rcvintpipe(usb,
1432                                         tiocmget->endp->
1433                                         bEndpointAddress & 0x7F),
1434                          tiocmget->serial_state_notification,
1435                          sizeof(struct hso_serial_state_notification),
1436                          tiocmget_intr_callback, serial,
1437                          tiocmget->endp->bInterval);
1438         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1439         if (result) {
1440                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1441                          result);
1442         }
1443         return result;
1444
1445 }
1446
1447 static void tiocmget_intr_callback(struct urb *urb)
1448 {
1449         struct hso_serial *serial = urb->context;
1450         struct hso_tiocmget *tiocmget;
1451         int status = urb->status;
1452         u16 UART_state_bitmap, prev_UART_state_bitmap;
1453         struct uart_icount *icount;
1454         struct hso_serial_state_notification *serial_state_notification;
1455         struct usb_device *usb;
1456         struct usb_interface *interface;
1457         int if_num;
1458
1459         /* Sanity checks */
1460         if (!serial)
1461                 return;
1462         if (status) {
1463                 handle_usb_error(status, __func__, serial->parent);
1464                 return;
1465         }
1466
1467         /* tiocmget is only supported on HSO_PORT_MODEM */
1468         tiocmget = serial->tiocmget;
1469         if (!tiocmget)
1470                 return;
1471         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1472
1473         usb = serial->parent->usb;
1474         interface = serial->parent->interface;
1475
1476         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1477
1478         /* wIndex should be the USB interface number of the port to which the
1479          * notification applies, which should always be the Modem port.
1480          */
1481         serial_state_notification = tiocmget->serial_state_notification;
1482         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1483             serial_state_notification->bNotification != B_NOTIFICATION ||
1484             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1485             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1486             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1487                 dev_warn(&usb->dev,
1488                          "hso received invalid serial state notification\n");
1489                 DUMP(serial_state_notification,
1490                      sizeof(struct hso_serial_state_notification));
1491         } else {
1492                 unsigned long flags;
1493
1494                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1495                                                 UART_state_bitmap);
1496                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1497                 icount = &tiocmget->icount;
1498                 spin_lock_irqsave(&serial->serial_lock, flags);
1499                 if ((UART_state_bitmap & B_OVERRUN) !=
1500                    (prev_UART_state_bitmap & B_OVERRUN))
1501                         icount->parity++;
1502                 if ((UART_state_bitmap & B_PARITY) !=
1503                    (prev_UART_state_bitmap & B_PARITY))
1504                         icount->parity++;
1505                 if ((UART_state_bitmap & B_FRAMING) !=
1506                    (prev_UART_state_bitmap & B_FRAMING))
1507                         icount->frame++;
1508                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1509                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1510                         icount->rng++;
1511                 if ((UART_state_bitmap & B_BREAK) !=
1512                    (prev_UART_state_bitmap & B_BREAK))
1513                         icount->brk++;
1514                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1515                    (prev_UART_state_bitmap & B_TX_CARRIER))
1516                         icount->dsr++;
1517                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1518                    (prev_UART_state_bitmap & B_RX_CARRIER))
1519                         icount->dcd++;
1520                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1521                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1522                 tiocmget->intr_completed = 1;
1523                 wake_up_interruptible(&tiocmget->waitq);
1524         }
1525         memset(serial_state_notification, 0,
1526                sizeof(struct hso_serial_state_notification));
1527         tiocmget_submit_urb(serial,
1528                             tiocmget,
1529                             serial->parent->usb);
1530 }
1531
1532 /*
1533  * next few functions largely stolen from drivers/serial/serial_core.c
1534  */
1535 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1536  * - mask passed in arg for lines of interest
1537  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1538  * Caller should use TIOCGICOUNT to see which one it was
1539  */
1540 static int
1541 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1542 {
1543         DECLARE_WAITQUEUE(wait, current);
1544         struct uart_icount cprev, cnow;
1545         struct hso_tiocmget  *tiocmget;
1546         int ret;
1547
1548         tiocmget = serial->tiocmget;
1549         if (!tiocmget)
1550                 return -ENOENT;
1551         /*
1552          * note the counters on entry
1553          */
1554         spin_lock_irq(&serial->serial_lock);
1555         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1556         spin_unlock_irq(&serial->serial_lock);
1557         add_wait_queue(&tiocmget->waitq, &wait);
1558         for (;;) {
1559                 spin_lock_irq(&serial->serial_lock);
1560                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1561                 spin_unlock_irq(&serial->serial_lock);
1562                 set_current_state(TASK_INTERRUPTIBLE);
1563                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1564                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1565                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1566                         ret = 0;
1567                         break;
1568                 }
1569                 schedule();
1570                 /* see if a signal did it */
1571                 if (signal_pending(current)) {
1572                         ret = -ERESTARTSYS;
1573                         break;
1574                 }
1575                 cprev = cnow;
1576         }
1577         __set_current_state(TASK_RUNNING);
1578         remove_wait_queue(&tiocmget->waitq, &wait);
1579
1580         return ret;
1581 }
1582
1583 /*
1584  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1585  * Return: write counters to the user passed counter struct
1586  * NB: both 1->0 and 0->1 transitions are counted except for
1587  *     RI where only 0->1 is counted.
1588  */
1589 static int hso_get_count(struct tty_struct *tty,
1590                   struct serial_icounter_struct *icount)
1591 {
1592         struct uart_icount cnow;
1593         struct hso_serial *serial = tty->driver_data;
1594         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1595
1596         memset(icount, 0, sizeof(struct serial_icounter_struct));
1597
1598         if (!tiocmget)
1599                  return -ENOENT;
1600         spin_lock_irq(&serial->serial_lock);
1601         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1602         spin_unlock_irq(&serial->serial_lock);
1603
1604         icount->cts         = cnow.cts;
1605         icount->dsr         = cnow.dsr;
1606         icount->rng         = cnow.rng;
1607         icount->dcd         = cnow.dcd;
1608         icount->rx          = cnow.rx;
1609         icount->tx          = cnow.tx;
1610         icount->frame       = cnow.frame;
1611         icount->overrun     = cnow.overrun;
1612         icount->parity      = cnow.parity;
1613         icount->brk         = cnow.brk;
1614         icount->buf_overrun = cnow.buf_overrun;
1615
1616         return 0;
1617 }
1618
1619
1620 static int hso_serial_tiocmget(struct tty_struct *tty)
1621 {
1622         int retval;
1623         struct hso_serial *serial = tty->driver_data;
1624         struct hso_tiocmget  *tiocmget;
1625         u16 UART_state_bitmap;
1626
1627         /* sanity check */
1628         if (!serial) {
1629                 hso_dbg(0x1, "no tty structures\n");
1630                 return -EINVAL;
1631         }
1632         spin_lock_irq(&serial->serial_lock);
1633         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1634             ((serial->dtr_state) ? TIOCM_DTR : 0);
1635         tiocmget = serial->tiocmget;
1636         if (tiocmget) {
1637
1638                 UART_state_bitmap = le16_to_cpu(
1639                         tiocmget->prev_UART_state_bitmap);
1640                 if (UART_state_bitmap & B_RING_SIGNAL)
1641                         retval |=  TIOCM_RNG;
1642                 if (UART_state_bitmap & B_RX_CARRIER)
1643                         retval |=  TIOCM_CD;
1644                 if (UART_state_bitmap & B_TX_CARRIER)
1645                         retval |=  TIOCM_DSR;
1646         }
1647         spin_unlock_irq(&serial->serial_lock);
1648         return retval;
1649 }
1650
1651 static int hso_serial_tiocmset(struct tty_struct *tty,
1652                                unsigned int set, unsigned int clear)
1653 {
1654         int val = 0;
1655         unsigned long flags;
1656         int if_num;
1657         struct hso_serial *serial = tty->driver_data;
1658         struct usb_interface *interface;
1659
1660         /* sanity check */
1661         if (!serial) {
1662                 hso_dbg(0x1, "no tty structures\n");
1663                 return -EINVAL;
1664         }
1665
1666         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1667                 return -EINVAL;
1668
1669         interface = serial->parent->interface;
1670         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1671
1672         spin_lock_irqsave(&serial->serial_lock, flags);
1673         if (set & TIOCM_RTS)
1674                 serial->rts_state = 1;
1675         if (set & TIOCM_DTR)
1676                 serial->dtr_state = 1;
1677
1678         if (clear & TIOCM_RTS)
1679                 serial->rts_state = 0;
1680         if (clear & TIOCM_DTR)
1681                 serial->dtr_state = 0;
1682
1683         if (serial->dtr_state)
1684                 val |= 0x01;
1685         if (serial->rts_state)
1686                 val |= 0x02;
1687
1688         spin_unlock_irqrestore(&serial->serial_lock, flags);
1689
1690         return usb_control_msg(serial->parent->usb,
1691                                usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
1692                                0x21, val, if_num, NULL, 0,
1693                                USB_CTRL_SET_TIMEOUT);
1694 }
1695
1696 static int hso_serial_ioctl(struct tty_struct *tty,
1697                             unsigned int cmd, unsigned long arg)
1698 {
1699         struct hso_serial *serial = tty->driver_data;
1700         int ret = 0;
1701         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1702
1703         if (!serial)
1704                 return -ENODEV;
1705         switch (cmd) {
1706         case TIOCMIWAIT:
1707                 ret = hso_wait_modem_status(serial, arg);
1708                 break;
1709         default:
1710                 ret = -ENOIOCTLCMD;
1711                 break;
1712         }
1713         return ret;
1714 }
1715
1716
1717 /* starts a transmit */
1718 static void hso_kick_transmit(struct hso_serial *serial)
1719 {
1720         unsigned long flags;
1721         int res;
1722
1723         spin_lock_irqsave(&serial->serial_lock, flags);
1724         if (!serial->tx_buffer_count)
1725                 goto out;
1726
1727         if (serial->tx_urb_used)
1728                 goto out;
1729
1730         /* Wakeup USB interface if necessary */
1731         if (hso_get_activity(serial->parent) == -EAGAIN)
1732                 goto out;
1733
1734         /* Switch pointers around to avoid memcpy */
1735         swap(serial->tx_buffer, serial->tx_data);
1736         serial->tx_data_count = serial->tx_buffer_count;
1737         serial->tx_buffer_count = 0;
1738
1739         /* If serial->tx_data is set, it means we switched buffers */
1740         if (serial->tx_data && serial->write_data) {
1741                 res = serial->write_data(serial);
1742                 if (res >= 0)
1743                         serial->tx_urb_used = 1;
1744         }
1745 out:
1746         spin_unlock_irqrestore(&serial->serial_lock, flags);
1747 }
1748
1749 /* make a request (for reading and writing data to muxed serial port) */
1750 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1751                               struct urb *ctrl_urb,
1752                               struct usb_ctrlrequest *ctrl_req,
1753                               u8 *ctrl_urb_data, u32 size)
1754 {
1755         int result;
1756         int pipe;
1757
1758         /* Sanity check */
1759         if (!serial || !ctrl_urb || !ctrl_req) {
1760                 pr_err("%s: Wrong arguments\n", __func__);
1761                 return -EINVAL;
1762         }
1763
1764         /* initialize */
1765         ctrl_req->wValue = 0;
1766         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1767         ctrl_req->wLength = cpu_to_le16(size);
1768
1769         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1770                 /* Reading command */
1771                 ctrl_req->bRequestType = USB_DIR_IN |
1772                                          USB_TYPE_OPTION_VENDOR |
1773                                          USB_RECIP_INTERFACE;
1774                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1775                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1776         } else {
1777                 /* Writing command */
1778                 ctrl_req->bRequestType = USB_DIR_OUT |
1779                                          USB_TYPE_OPTION_VENDOR |
1780                                          USB_RECIP_INTERFACE;
1781                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1782                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1783         }
1784         /* syslog */
1785         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1786                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1787                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1788
1789         /* Load ctrl urb */
1790         ctrl_urb->transfer_flags = 0;
1791         usb_fill_control_urb(ctrl_urb,
1792                              serial->parent->usb,
1793                              pipe,
1794                              (u8 *) ctrl_req,
1795                              ctrl_urb_data, size, ctrl_callback, serial);
1796         /* Send it on merry way */
1797         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1798         if (result) {
1799                 dev_err(&ctrl_urb->dev->dev,
1800                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1801                         result, type);
1802                 return result;
1803         }
1804
1805         /* done */
1806         return size;
1807 }
1808
1809 /* called by intr_callback when read occurs */
1810 static int hso_mux_serial_read(struct hso_serial *serial)
1811 {
1812         if (!serial)
1813                 return -EINVAL;
1814
1815         /* clean data */
1816         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1817         /* make the request */
1818
1819         if (serial->num_rx_urbs != 1) {
1820                 dev_err(&serial->parent->interface->dev,
1821                         "ERROR: mux'd reads with multiple buffers "
1822                         "not possible\n");
1823                 return 0;
1824         }
1825         return mux_device_request(serial,
1826                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1827                                   serial->parent->port_spec & HSO_PORT_MASK,
1828                                   serial->rx_urb[0],
1829                                   &serial->ctrl_req_rx,
1830                                   serial->rx_data[0], serial->rx_data_length);
1831 }
1832
1833 /* used for muxed serial port callback (muxed serial read) */
1834 static void intr_callback(struct urb *urb)
1835 {
1836         struct hso_shared_int *shared_int = urb->context;
1837         struct hso_serial *serial;
1838         unsigned char *port_req;
1839         int status = urb->status;
1840         unsigned long flags;
1841         int i;
1842
1843         usb_mark_last_busy(urb->dev);
1844
1845         /* sanity check */
1846         if (!shared_int)
1847                 return;
1848
1849         /* status check */
1850         if (status) {
1851                 handle_usb_error(status, __func__, NULL);
1852                 return;
1853         }
1854         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1855
1856         /* what request? */
1857         port_req = urb->transfer_buffer;
1858         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1859         /* loop over all muxed ports to find the one sending this */
1860         for (i = 0; i < 8; i++) {
1861                 /* max 8 channels on MUX */
1862                 if (*port_req & (1 << i)) {
1863                         serial = get_serial_by_shared_int_and_type(shared_int,
1864                                                                    (1 << i));
1865                         if (serial != NULL) {
1866                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1867                                         i);
1868                                 spin_lock_irqsave(&serial->serial_lock, flags);
1869                                 if (serial->rx_state == RX_IDLE &&
1870                                         serial->port.count > 0) {
1871                                         /* Setup and send a ctrl req read on
1872                                          * port i */
1873                                         if (!serial->rx_urb_filled[0]) {
1874                                                 serial->rx_state = RX_SENT;
1875                                                 hso_mux_serial_read(serial);
1876                                         } else
1877                                                 serial->rx_state = RX_PENDING;
1878                                 } else {
1879                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1880                                                 i);
1881                                 }
1882                                 spin_unlock_irqrestore(&serial->serial_lock,
1883                                                        flags);
1884                         }
1885                 }
1886         }
1887         /* Resubmit interrupt urb */
1888         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1889 }
1890
1891 /* called for writing to muxed serial port */
1892 static int hso_mux_serial_write_data(struct hso_serial *serial)
1893 {
1894         if (NULL == serial)
1895                 return -EINVAL;
1896
1897         return mux_device_request(serial,
1898                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1899                                   serial->parent->port_spec & HSO_PORT_MASK,
1900                                   serial->tx_urb,
1901                                   &serial->ctrl_req_tx,
1902                                   serial->tx_data, serial->tx_data_count);
1903 }
1904
1905 /* write callback for Diag and CS port */
1906 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1907 {
1908         struct hso_serial *serial = urb->context;
1909         int status = urb->status;
1910         unsigned long flags;
1911
1912         /* sanity check */
1913         if (!serial) {
1914                 hso_dbg(0x1, "serial == NULL\n");
1915                 return;
1916         }
1917
1918         spin_lock_irqsave(&serial->serial_lock, flags);
1919         serial->tx_urb_used = 0;
1920         spin_unlock_irqrestore(&serial->serial_lock, flags);
1921         if (status) {
1922                 handle_usb_error(status, __func__, serial->parent);
1923                 return;
1924         }
1925         hso_put_activity(serial->parent);
1926         tty_port_tty_wakeup(&serial->port);
1927         hso_kick_transmit(serial);
1928
1929         hso_dbg(0x1, "\n");
1930 }
1931
1932 /* called for writing diag or CS serial port */
1933 static int hso_std_serial_write_data(struct hso_serial *serial)
1934 {
1935         int count = serial->tx_data_count;
1936         int result;
1937
1938         usb_fill_bulk_urb(serial->tx_urb,
1939                           serial->parent->usb,
1940                           usb_sndbulkpipe(serial->parent->usb,
1941                                           serial->out_endp->
1942                                           bEndpointAddress & 0x7F),
1943                           serial->tx_data, serial->tx_data_count,
1944                           hso_std_serial_write_bulk_callback, serial);
1945
1946         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1947         if (result) {
1948                 dev_warn(&serial->parent->usb->dev,
1949                          "Failed to submit urb - res %d\n", result);
1950                 return result;
1951         }
1952
1953         return count;
1954 }
1955
1956 /* callback after read or write on muxed serial port */
1957 static void ctrl_callback(struct urb *urb)
1958 {
1959         struct hso_serial *serial = urb->context;
1960         struct usb_ctrlrequest *req;
1961         int status = urb->status;
1962         unsigned long flags;
1963
1964         /* sanity check */
1965         if (!serial)
1966                 return;
1967
1968         spin_lock_irqsave(&serial->serial_lock, flags);
1969         serial->tx_urb_used = 0;
1970         spin_unlock_irqrestore(&serial->serial_lock, flags);
1971         if (status) {
1972                 handle_usb_error(status, __func__, serial->parent);
1973                 return;
1974         }
1975
1976         /* what request? */
1977         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1978         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1979         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1980         DUMP1(urb->transfer_buffer, urb->actual_length);
1981
1982         if (req->bRequestType ==
1983             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1984                 /* response to a read command */
1985                 serial->rx_urb_filled[0] = 1;
1986                 spin_lock_irqsave(&serial->serial_lock, flags);
1987                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1988                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1989         } else {
1990                 hso_put_activity(serial->parent);
1991                 tty_port_tty_wakeup(&serial->port);
1992                 /* response to a write command */
1993                 hso_kick_transmit(serial);
1994         }
1995 }
1996
1997 /* handle RX data for serial port */
1998 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
1999 {
2000         struct tty_struct *tty;
2001         int count;
2002
2003         /* Sanity check */
2004         if (urb == NULL || serial == NULL) {
2005                 hso_dbg(0x1, "serial = NULL\n");
2006                 return -2;
2007         }
2008
2009         tty = tty_port_tty_get(&serial->port);
2010
2011         if (tty && tty_throttled(tty)) {
2012                 tty_kref_put(tty);
2013                 return -1;
2014         }
2015
2016         /* Push data to tty */
2017         hso_dbg(0x1, "data to push to tty\n");
2018         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2019         if (count >= urb->actual_length) {
2020                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2021                                        urb->actual_length);
2022                 tty_flip_buffer_push(&serial->port);
2023         } else {
2024                 dev_warn(&serial->parent->usb->dev,
2025                          "dropping data, %d bytes lost\n", urb->actual_length);
2026         }
2027
2028         tty_kref_put(tty);
2029
2030         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2031
2032         return 0;
2033 }
2034
2035
2036 /* Base driver functions */
2037
2038 static void hso_log_port(struct hso_device *hso_dev)
2039 {
2040         char *port_type;
2041         char port_dev[20];
2042
2043         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2044         case HSO_PORT_CONTROL:
2045                 port_type = "Control";
2046                 break;
2047         case HSO_PORT_APP:
2048                 port_type = "Application";
2049                 break;
2050         case HSO_PORT_GPS:
2051                 port_type = "GPS";
2052                 break;
2053         case HSO_PORT_GPS_CONTROL:
2054                 port_type = "GPS control";
2055                 break;
2056         case HSO_PORT_APP2:
2057                 port_type = "Application2";
2058                 break;
2059         case HSO_PORT_PCSC:
2060                 port_type = "PCSC";
2061                 break;
2062         case HSO_PORT_DIAG:
2063                 port_type = "Diagnostic";
2064                 break;
2065         case HSO_PORT_DIAG2:
2066                 port_type = "Diagnostic2";
2067                 break;
2068         case HSO_PORT_MODEM:
2069                 port_type = "Modem";
2070                 break;
2071         case HSO_PORT_NETWORK:
2072                 port_type = "Network";
2073                 break;
2074         default:
2075                 port_type = "Unknown";
2076                 break;
2077         }
2078         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2079                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2080         } else
2081                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2082                         dev2ser(hso_dev)->minor);
2083
2084         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2085                 port_type, port_dev);
2086 }
2087
2088 static int hso_start_net_device(struct hso_device *hso_dev)
2089 {
2090         int i, result = 0;
2091         struct hso_net *hso_net = dev2net(hso_dev);
2092
2093         if (!hso_net)
2094                 return -ENODEV;
2095
2096         /* send URBs for all read buffers */
2097         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2098
2099                 /* Prep a receive URB */
2100                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2101                                   hso_dev->usb,
2102                                   usb_rcvbulkpipe(hso_dev->usb,
2103                                                   hso_net->in_endp->
2104                                                   bEndpointAddress & 0x7F),
2105                                   hso_net->mux_bulk_rx_buf_pool[i],
2106                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2107                                   hso_net);
2108
2109                 /* Put it out there so the device can send us stuff */
2110                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2111                                         GFP_NOIO);
2112                 if (result)
2113                         dev_warn(&hso_dev->usb->dev,
2114                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2115                                 i, result);
2116         }
2117
2118         return result;
2119 }
2120
2121 static int hso_stop_net_device(struct hso_device *hso_dev)
2122 {
2123         int i;
2124         struct hso_net *hso_net = dev2net(hso_dev);
2125
2126         if (!hso_net)
2127                 return -ENODEV;
2128
2129         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2130                 if (hso_net->mux_bulk_rx_urb_pool[i])
2131                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2132
2133         }
2134         if (hso_net->mux_bulk_tx_urb)
2135                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2136
2137         return 0;
2138 }
2139
2140 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2141 {
2142         int i, result = 0;
2143         struct hso_serial *serial = dev2ser(hso_dev);
2144
2145         if (!serial)
2146                 return -ENODEV;
2147
2148         /* If it is not the MUX port fill in and submit a bulk urb (already
2149          * allocated in hso_serial_start) */
2150         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2151                 for (i = 0; i < serial->num_rx_urbs; i++) {
2152                         usb_fill_bulk_urb(serial->rx_urb[i],
2153                                           serial->parent->usb,
2154                                           usb_rcvbulkpipe(serial->parent->usb,
2155                                                           serial->in_endp->
2156                                                           bEndpointAddress &
2157                                                           0x7F),
2158                                           serial->rx_data[i],
2159                                           serial->rx_data_length,
2160                                           hso_std_serial_read_bulk_callback,
2161                                           serial);
2162                         result = usb_submit_urb(serial->rx_urb[i], flags);
2163                         if (result) {
2164                                 dev_warn(&serial->parent->usb->dev,
2165                                          "Failed to submit urb - res %d\n",
2166                                          result);
2167                                 break;
2168                         }
2169                 }
2170         } else {
2171                 mutex_lock(&serial->shared_int->shared_int_lock);
2172                 if (!serial->shared_int->use_count) {
2173                         result =
2174                             hso_mux_submit_intr_urb(serial->shared_int,
2175                                                     hso_dev->usb, flags);
2176                 }
2177                 serial->shared_int->use_count++;
2178                 mutex_unlock(&serial->shared_int->shared_int_lock);
2179         }
2180         if (serial->tiocmget)
2181                 tiocmget_submit_urb(serial,
2182                                     serial->tiocmget,
2183                                     serial->parent->usb);
2184         return result;
2185 }
2186
2187 static int hso_stop_serial_device(struct hso_device *hso_dev)
2188 {
2189         int i;
2190         struct hso_serial *serial = dev2ser(hso_dev);
2191         struct hso_tiocmget  *tiocmget;
2192
2193         if (!serial)
2194                 return -ENODEV;
2195
2196         for (i = 0; i < serial->num_rx_urbs; i++) {
2197                 if (serial->rx_urb[i]) {
2198                         usb_kill_urb(serial->rx_urb[i]);
2199                         serial->rx_urb_filled[i] = 0;
2200                 }
2201         }
2202         serial->curr_rx_urb_idx = 0;
2203
2204         if (serial->tx_urb)
2205                 usb_kill_urb(serial->tx_urb);
2206
2207         if (serial->shared_int) {
2208                 mutex_lock(&serial->shared_int->shared_int_lock);
2209                 if (serial->shared_int->use_count &&
2210                     (--serial->shared_int->use_count == 0)) {
2211                         struct urb *urb;
2212
2213                         urb = serial->shared_int->shared_intr_urb;
2214                         if (urb)
2215                                 usb_kill_urb(urb);
2216                 }
2217                 mutex_unlock(&serial->shared_int->shared_int_lock);
2218         }
2219         tiocmget = serial->tiocmget;
2220         if (tiocmget) {
2221                 wake_up_interruptible(&tiocmget->waitq);
2222                 usb_kill_urb(tiocmget->urb);
2223         }
2224
2225         return 0;
2226 }
2227
2228 static void hso_serial_tty_unregister(struct hso_serial *serial)
2229 {
2230         tty_unregister_device(tty_drv, serial->minor);
2231         release_minor(serial);
2232 }
2233
2234 static void hso_serial_common_free(struct hso_serial *serial)
2235 {
2236         int i;
2237
2238         for (i = 0; i < serial->num_rx_urbs; i++) {
2239                 /* unlink and free RX URB */
2240                 usb_free_urb(serial->rx_urb[i]);
2241                 /* free the RX buffer */
2242                 kfree(serial->rx_data[i]);
2243         }
2244
2245         /* unlink and free TX URB */
2246         usb_free_urb(serial->tx_urb);
2247         kfree(serial->tx_buffer);
2248         kfree(serial->tx_data);
2249         tty_port_destroy(&serial->port);
2250 }
2251
2252 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2253                                     int rx_size, int tx_size)
2254 {
2255         int i;
2256
2257         tty_port_init(&serial->port);
2258
2259         if (obtain_minor(serial))
2260                 goto exit2;
2261
2262         /* register our minor number */
2263         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2264                         tty_drv, serial->minor, &serial->parent->interface->dev,
2265                         serial->parent, hso_serial_dev_groups);
2266         if (IS_ERR(serial->parent->dev)) {
2267                 release_minor(serial);
2268                 goto exit2;
2269         }
2270
2271         serial->magic = HSO_SERIAL_MAGIC;
2272         spin_lock_init(&serial->serial_lock);
2273         serial->num_rx_urbs = num_urbs;
2274
2275         /* RX, allocate urb and initialize */
2276
2277         /* prepare our RX buffer */
2278         serial->rx_data_length = rx_size;
2279         for (i = 0; i < serial->num_rx_urbs; i++) {
2280                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2281                 if (!serial->rx_urb[i])
2282                         goto exit;
2283                 serial->rx_urb[i]->transfer_buffer = NULL;
2284                 serial->rx_urb[i]->transfer_buffer_length = 0;
2285                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2286                                              GFP_KERNEL);
2287                 if (!serial->rx_data[i])
2288                         goto exit;
2289         }
2290
2291         /* TX, allocate urb and initialize */
2292         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2293         if (!serial->tx_urb)
2294                 goto exit;
2295         serial->tx_urb->transfer_buffer = NULL;
2296         serial->tx_urb->transfer_buffer_length = 0;
2297         /* prepare our TX buffer */
2298         serial->tx_data_count = 0;
2299         serial->tx_buffer_count = 0;
2300         serial->tx_data_length = tx_size;
2301         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2302         if (!serial->tx_data)
2303                 goto exit;
2304
2305         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2306         if (!serial->tx_buffer)
2307                 goto exit;
2308
2309         return 0;
2310 exit:
2311         hso_serial_tty_unregister(serial);
2312 exit2:
2313         hso_serial_common_free(serial);
2314         return -1;
2315 }
2316
2317 /* Creates a general hso device */
2318 static struct hso_device *hso_create_device(struct usb_interface *intf,
2319                                             int port_spec)
2320 {
2321         struct hso_device *hso_dev;
2322
2323         hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2324         if (!hso_dev)
2325                 return NULL;
2326
2327         hso_dev->port_spec = port_spec;
2328         hso_dev->usb = interface_to_usbdev(intf);
2329         hso_dev->interface = intf;
2330         kref_init(&hso_dev->ref);
2331         mutex_init(&hso_dev->mutex);
2332
2333         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2334         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2335
2336         return hso_dev;
2337 }
2338
2339 /* Removes a network device in the network device table */
2340 static int remove_net_device(struct hso_device *hso_dev)
2341 {
2342         int i;
2343
2344         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2345                 if (network_table[i] == hso_dev) {
2346                         network_table[i] = NULL;
2347                         break;
2348                 }
2349         }
2350         if (i == HSO_MAX_NET_DEVICES)
2351                 return -1;
2352         return 0;
2353 }
2354
2355 /* Frees our network device */
2356 static void hso_free_net_device(struct hso_device *hso_dev, bool bailout)
2357 {
2358         int i;
2359         struct hso_net *hso_net = dev2net(hso_dev);
2360
2361         if (!hso_net)
2362                 return;
2363
2364         remove_net_device(hso_net->parent);
2365
2366         if (hso_net->net)
2367                 unregister_netdev(hso_net->net);
2368
2369         /* start freeing */
2370         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2371                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2372                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2373                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2374         }
2375         usb_free_urb(hso_net->mux_bulk_tx_urb);
2376         kfree(hso_net->mux_bulk_tx_buf);
2377         hso_net->mux_bulk_tx_buf = NULL;
2378
2379         if (hso_net->net && !bailout)
2380                 free_netdev(hso_net->net);
2381
2382         kfree(hso_dev);
2383 }
2384
2385 static const struct net_device_ops hso_netdev_ops = {
2386         .ndo_open       = hso_net_open,
2387         .ndo_stop       = hso_net_close,
2388         .ndo_start_xmit = hso_net_start_xmit,
2389         .ndo_tx_timeout = hso_net_tx_timeout,
2390 };
2391
2392 /* initialize the network interface */
2393 static void hso_net_init(struct net_device *net)
2394 {
2395         struct hso_net *hso_net = netdev_priv(net);
2396
2397         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2398
2399         /* fill in the other fields */
2400         net->netdev_ops = &hso_netdev_ops;
2401         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2402         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2403         net->type = ARPHRD_NONE;
2404         net->mtu = DEFAULT_MTU - 14;
2405         net->tx_queue_len = 10;
2406         net->ethtool_ops = &ops;
2407
2408         /* and initialize the semaphore */
2409         spin_lock_init(&hso_net->net_lock);
2410 }
2411
2412 /* Adds a network device in the network device table */
2413 static int add_net_device(struct hso_device *hso_dev)
2414 {
2415         int i;
2416
2417         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2418                 if (network_table[i] == NULL) {
2419                         network_table[i] = hso_dev;
2420                         break;
2421                 }
2422         }
2423         if (i == HSO_MAX_NET_DEVICES)
2424                 return -1;
2425         return 0;
2426 }
2427
2428 static int hso_rfkill_set_block(void *data, bool blocked)
2429 {
2430         struct hso_device *hso_dev = data;
2431         int enabled = !blocked;
2432         int rv;
2433
2434         mutex_lock(&hso_dev->mutex);
2435         if (hso_dev->usb_gone)
2436                 rv = 0;
2437         else
2438                 rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
2439                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2440                                        USB_CTRL_SET_TIMEOUT);
2441         mutex_unlock(&hso_dev->mutex);
2442         return rv;
2443 }
2444
2445 static const struct rfkill_ops hso_rfkill_ops = {
2446         .set_block = hso_rfkill_set_block,
2447 };
2448
2449 /* Creates and sets up everything for rfkill */
2450 static void hso_create_rfkill(struct hso_device *hso_dev,
2451                              struct usb_interface *interface)
2452 {
2453         struct hso_net *hso_net = dev2net(hso_dev);
2454         struct device *dev = &hso_net->net->dev;
2455         static u32 rfkill_counter;
2456
2457         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2458                  rfkill_counter++);
2459
2460         hso_net->rfkill = rfkill_alloc(hso_net->name,
2461                                        &interface_to_usbdev(interface)->dev,
2462                                        RFKILL_TYPE_WWAN,
2463                                        &hso_rfkill_ops, hso_dev);
2464         if (!hso_net->rfkill)
2465                 return;
2466
2467         if (rfkill_register(hso_net->rfkill) < 0) {
2468                 rfkill_destroy(hso_net->rfkill);
2469                 hso_net->rfkill = NULL;
2470                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2471                 return;
2472         }
2473 }
2474
2475 static struct device_type hso_type = {
2476         .name   = "wwan",
2477 };
2478
2479 /* Creates our network device */
2480 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2481                                                 int port_spec)
2482 {
2483         int result, i;
2484         struct net_device *net;
2485         struct hso_net *hso_net;
2486         struct hso_device *hso_dev;
2487
2488         hso_dev = hso_create_device(interface, port_spec);
2489         if (!hso_dev)
2490                 return NULL;
2491
2492         /* allocate our network device, then we can put in our private data */
2493         /* call hso_net_init to do the basic initialization */
2494         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2495                            hso_net_init);
2496         if (!net) {
2497                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2498                 goto exit;
2499         }
2500
2501         hso_net = netdev_priv(net);
2502
2503         hso_dev->port_data.dev_net = hso_net;
2504         hso_net->net = net;
2505         hso_net->parent = hso_dev;
2506
2507         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2508                                       USB_DIR_IN);
2509         if (!hso_net->in_endp) {
2510                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2511                 goto exit;
2512         }
2513         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2514                                        USB_DIR_OUT);
2515         if (!hso_net->out_endp) {
2516                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2517                 goto exit;
2518         }
2519         SET_NETDEV_DEV(net, &interface->dev);
2520         SET_NETDEV_DEVTYPE(net, &hso_type);
2521
2522         /* start allocating */
2523         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2524                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2525                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2526                         goto exit;
2527                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2528                                                            GFP_KERNEL);
2529                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2530                         goto exit;
2531         }
2532         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2533         if (!hso_net->mux_bulk_tx_urb)
2534                 goto exit;
2535         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2536         if (!hso_net->mux_bulk_tx_buf)
2537                 goto exit;
2538
2539         add_net_device(hso_dev);
2540
2541         /* registering our net device */
2542         result = register_netdev(net);
2543         if (result) {
2544                 dev_err(&interface->dev, "Failed to register device\n");
2545                 goto exit;
2546         }
2547
2548         hso_log_port(hso_dev);
2549
2550         hso_create_rfkill(hso_dev, interface);
2551
2552         return hso_dev;
2553 exit:
2554         hso_free_net_device(hso_dev, true);
2555         return NULL;
2556 }
2557
2558 static void hso_free_tiomget(struct hso_serial *serial)
2559 {
2560         struct hso_tiocmget *tiocmget;
2561         if (!serial)
2562                 return;
2563         tiocmget = serial->tiocmget;
2564         if (tiocmget) {
2565                 usb_free_urb(tiocmget->urb);
2566                 tiocmget->urb = NULL;
2567                 serial->tiocmget = NULL;
2568                 kfree(tiocmget->serial_state_notification);
2569                 tiocmget->serial_state_notification = NULL;
2570                 kfree(tiocmget);
2571         }
2572 }
2573
2574 /* Frees an AT channel ( goes for both mux and non-mux ) */
2575 static void hso_free_serial_device(struct hso_device *hso_dev)
2576 {
2577         struct hso_serial *serial = dev2ser(hso_dev);
2578
2579         if (!serial)
2580                 return;
2581
2582         hso_serial_common_free(serial);
2583
2584         if (serial->shared_int) {
2585                 mutex_lock(&serial->shared_int->shared_int_lock);
2586                 if (--serial->shared_int->ref_count == 0)
2587                         hso_free_shared_int(serial->shared_int);
2588                 else
2589                         mutex_unlock(&serial->shared_int->shared_int_lock);
2590         }
2591         hso_free_tiomget(serial);
2592         kfree(serial);
2593         kfree(hso_dev);
2594 }
2595
2596 /* Creates a bulk AT channel */
2597 static struct hso_device *hso_create_bulk_serial_device(
2598                         struct usb_interface *interface, int port)
2599 {
2600         struct hso_device *hso_dev;
2601         struct hso_serial *serial;
2602         int num_urbs;
2603         struct hso_tiocmget *tiocmget;
2604
2605         hso_dev = hso_create_device(interface, port);
2606         if (!hso_dev)
2607                 return NULL;
2608
2609         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2610         if (!serial)
2611                 goto exit;
2612
2613         serial->parent = hso_dev;
2614         hso_dev->port_data.dev_serial = serial;
2615
2616         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2617                 num_urbs = 2;
2618                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2619                                            GFP_KERNEL);
2620                 if (!serial->tiocmget)
2621                         goto exit;
2622                 serial->tiocmget->serial_state_notification
2623                         = kzalloc(sizeof(struct hso_serial_state_notification),
2624                                            GFP_KERNEL);
2625                 if (!serial->tiocmget->serial_state_notification)
2626                         goto exit;
2627                 tiocmget = serial->tiocmget;
2628                 tiocmget->endp = hso_get_ep(interface,
2629                                             USB_ENDPOINT_XFER_INT,
2630                                             USB_DIR_IN);
2631                 if (!tiocmget->endp) {
2632                         dev_err(&interface->dev, "Failed to find INT IN ep\n");
2633                         goto exit;
2634                 }
2635
2636                 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2637                 if (!tiocmget->urb)
2638                         goto exit;
2639
2640                 mutex_init(&tiocmget->mutex);
2641                 init_waitqueue_head(&tiocmget->waitq);
2642         } else {
2643                 num_urbs = 1;
2644         }
2645
2646         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2647                                      BULK_URB_TX_SIZE))
2648                 goto exit;
2649
2650         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2651                                      USB_DIR_IN);
2652         if (!serial->in_endp) {
2653                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2654                 goto exit2;
2655         }
2656
2657         if (!
2658             (serial->out_endp =
2659              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2660                 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2661                 goto exit2;
2662         }
2663
2664         serial->write_data = hso_std_serial_write_data;
2665
2666         /* setup the proc dirs and files if needed */
2667         hso_log_port(hso_dev);
2668
2669         /* done, return it */
2670         return hso_dev;
2671
2672 exit2:
2673         hso_serial_tty_unregister(serial);
2674         hso_serial_common_free(serial);
2675 exit:
2676         hso_free_tiomget(serial);
2677         kfree(serial);
2678         kfree(hso_dev);
2679         return NULL;
2680 }
2681
2682 /* Creates a multiplexed AT channel */
2683 static
2684 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2685                                                 int port,
2686                                                 struct hso_shared_int *mux)
2687 {
2688         struct hso_device *hso_dev;
2689         struct hso_serial *serial;
2690         int port_spec;
2691
2692         port_spec = HSO_INTF_MUX;
2693         port_spec &= ~HSO_PORT_MASK;
2694
2695         port_spec |= hso_mux_to_port(port);
2696         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2697                 return NULL;
2698
2699         hso_dev = hso_create_device(interface, port_spec);
2700         if (!hso_dev)
2701                 return NULL;
2702
2703         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2704         if (!serial)
2705                 goto exit;
2706
2707         hso_dev->port_data.dev_serial = serial;
2708         serial->parent = hso_dev;
2709
2710         if (hso_serial_common_create
2711             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2712                 goto exit;
2713
2714         serial->tx_data_length--;
2715         serial->write_data = hso_mux_serial_write_data;
2716
2717         serial->shared_int = mux;
2718         mutex_lock(&serial->shared_int->shared_int_lock);
2719         serial->shared_int->ref_count++;
2720         mutex_unlock(&serial->shared_int->shared_int_lock);
2721
2722         /* setup the proc dirs and files if needed */
2723         hso_log_port(hso_dev);
2724
2725         /* done, return it */
2726         return hso_dev;
2727
2728 exit:
2729         if (serial) {
2730                 tty_unregister_device(tty_drv, serial->minor);
2731                 kfree(serial);
2732         }
2733         kfree(hso_dev);
2734         return NULL;
2735
2736 }
2737
2738 static void hso_free_shared_int(struct hso_shared_int *mux)
2739 {
2740         usb_free_urb(mux->shared_intr_urb);
2741         kfree(mux->shared_intr_buf);
2742         mutex_unlock(&mux->shared_int_lock);
2743         kfree(mux);
2744 }
2745
2746 static
2747 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2748 {
2749         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2750
2751         if (!mux)
2752                 return NULL;
2753
2754         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2755                                     USB_DIR_IN);
2756         if (!mux->intr_endp) {
2757                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2758                 goto exit;
2759         }
2760
2761         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2762         if (!mux->shared_intr_urb)
2763                 goto exit;
2764         mux->shared_intr_buf =
2765                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2766                         GFP_KERNEL);
2767         if (!mux->shared_intr_buf)
2768                 goto exit;
2769
2770         mutex_init(&mux->shared_int_lock);
2771
2772         return mux;
2773
2774 exit:
2775         kfree(mux->shared_intr_buf);
2776         usb_free_urb(mux->shared_intr_urb);
2777         kfree(mux);
2778         return NULL;
2779 }
2780
2781 /* Gets the port spec for a certain interface */
2782 static int hso_get_config_data(struct usb_interface *interface)
2783 {
2784         struct usb_device *usbdev = interface_to_usbdev(interface);
2785         u8 *config_data = kmalloc(17, GFP_KERNEL);
2786         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2787         s32 result;
2788
2789         if (!config_data)
2790                 return -ENOMEM;
2791         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2792                             0x86, 0xC0, 0, 0, config_data, 17,
2793                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2794                 kfree(config_data);
2795                 return -EIO;
2796         }
2797
2798         /* check if we have a valid interface */
2799         if (if_num > 16) {
2800                 kfree(config_data);
2801                 return -EINVAL;
2802         }
2803
2804         switch (config_data[if_num]) {
2805         case 0x0:
2806                 result = 0;
2807                 break;
2808         case 0x1:
2809                 result = HSO_PORT_DIAG;
2810                 break;
2811         case 0x2:
2812                 result = HSO_PORT_GPS;
2813                 break;
2814         case 0x3:
2815                 result = HSO_PORT_GPS_CONTROL;
2816                 break;
2817         case 0x4:
2818                 result = HSO_PORT_APP;
2819                 break;
2820         case 0x5:
2821                 result = HSO_PORT_APP2;
2822                 break;
2823         case 0x6:
2824                 result = HSO_PORT_CONTROL;
2825                 break;
2826         case 0x7:
2827                 result = HSO_PORT_NETWORK;
2828                 break;
2829         case 0x8:
2830                 result = HSO_PORT_MODEM;
2831                 break;
2832         case 0x9:
2833                 result = HSO_PORT_MSD;
2834                 break;
2835         case 0xa:
2836                 result = HSO_PORT_PCSC;
2837                 break;
2838         case 0xb:
2839                 result = HSO_PORT_VOICE;
2840                 break;
2841         default:
2842                 result = 0;
2843         }
2844
2845         if (result)
2846                 result |= HSO_INTF_BULK;
2847
2848         if (config_data[16] & 0x1)
2849                 result |= HSO_INFO_CRC_BUG;
2850
2851         kfree(config_data);
2852         return result;
2853 }
2854
2855 /* called once for each interface upon device insertion */
2856 static int hso_probe(struct usb_interface *interface,
2857                      const struct usb_device_id *id)
2858 {
2859         int mux, i, if_num, port_spec;
2860         unsigned char port_mask;
2861         struct hso_device *hso_dev = NULL;
2862         struct hso_shared_int *shared_int;
2863         struct hso_device *tmp_dev = NULL;
2864
2865         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2866                 dev_err(&interface->dev, "Not our interface\n");
2867                 return -ENODEV;
2868         }
2869
2870         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2871
2872         /* Get the interface/port specification from either driver_info or from
2873          * the device itself */
2874         if (id->driver_info) {
2875                 /* if_num is controlled by the device, driver_info is a 0 terminated
2876                  * array. Make sure, the access is in bounds! */
2877                 for (i = 0; i <= if_num; ++i)
2878                         if (((u32 *)(id->driver_info))[i] == 0)
2879                                 goto exit;
2880                 port_spec = ((u32 *)(id->driver_info))[if_num];
2881         } else {
2882                 port_spec = hso_get_config_data(interface);
2883                 if (port_spec < 0)
2884                         goto exit;
2885         }
2886
2887         /* Check if we need to switch to alt interfaces prior to port
2888          * configuration */
2889         if (interface->num_altsetting > 1)
2890                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2891         interface->needs_remote_wakeup = 1;
2892
2893         /* Allocate new hso device(s) */
2894         switch (port_spec & HSO_INTF_MASK) {
2895         case HSO_INTF_MUX:
2896                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2897                         /* Create the network device */
2898                         if (!disable_net) {
2899                                 hso_dev = hso_create_net_device(interface,
2900                                                                 port_spec);
2901                                 if (!hso_dev)
2902                                         goto exit;
2903                                 tmp_dev = hso_dev;
2904                         }
2905                 }
2906
2907                 if (hso_get_mux_ports(interface, &port_mask))
2908                         /* TODO: de-allocate everything */
2909                         goto exit;
2910
2911                 shared_int = hso_create_shared_int(interface);
2912                 if (!shared_int)
2913                         goto exit;
2914
2915                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2916                         if (port_mask & i) {
2917                                 hso_dev = hso_create_mux_serial_device(
2918                                                 interface, i, shared_int);
2919                                 if (!hso_dev)
2920                                         goto exit;
2921                         }
2922                 }
2923
2924                 if (tmp_dev)
2925                         hso_dev = tmp_dev;
2926                 break;
2927
2928         case HSO_INTF_BULK:
2929                 /* It's a regular bulk interface */
2930                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2931                         if (!disable_net)
2932                                 hso_dev =
2933                                     hso_create_net_device(interface, port_spec);
2934                 } else {
2935                         hso_dev =
2936                             hso_create_bulk_serial_device(interface, port_spec);
2937                 }
2938                 if (!hso_dev)
2939                         goto exit;
2940                 break;
2941         default:
2942                 goto exit;
2943         }
2944
2945         /* save our data pointer in this device */
2946         usb_set_intfdata(interface, hso_dev);
2947
2948         /* done */
2949         return 0;
2950 exit:
2951         hso_free_interface(interface);
2952         return -ENODEV;
2953 }
2954
2955 /* device removed, cleaning up */
2956 static void hso_disconnect(struct usb_interface *interface)
2957 {
2958         hso_free_interface(interface);
2959
2960         /* remove reference of our private data */
2961         usb_set_intfdata(interface, NULL);
2962 }
2963
2964 static void async_get_intf(struct work_struct *data)
2965 {
2966         struct hso_device *hso_dev =
2967             container_of(data, struct hso_device, async_get_intf);
2968         usb_autopm_get_interface(hso_dev->interface);
2969 }
2970
2971 static void async_put_intf(struct work_struct *data)
2972 {
2973         struct hso_device *hso_dev =
2974             container_of(data, struct hso_device, async_put_intf);
2975         usb_autopm_put_interface(hso_dev->interface);
2976 }
2977
2978 static int hso_get_activity(struct hso_device *hso_dev)
2979 {
2980         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2981                 if (!hso_dev->is_active) {
2982                         hso_dev->is_active = 1;
2983                         schedule_work(&hso_dev->async_get_intf);
2984                 }
2985         }
2986
2987         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2988                 return -EAGAIN;
2989
2990         usb_mark_last_busy(hso_dev->usb);
2991
2992         return 0;
2993 }
2994
2995 static int hso_put_activity(struct hso_device *hso_dev)
2996 {
2997         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
2998                 if (hso_dev->is_active) {
2999                         hso_dev->is_active = 0;
3000                         schedule_work(&hso_dev->async_put_intf);
3001                         return -EAGAIN;
3002                 }
3003         }
3004         hso_dev->is_active = 0;
3005         return 0;
3006 }
3007
3008 /* called by kernel when we need to suspend device */
3009 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3010 {
3011         int i, result;
3012
3013         /* Stop all serial ports */
3014         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3015                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3016                         result = hso_stop_serial_device(serial_table[i]);
3017                         if (result)
3018                                 goto out;
3019                 }
3020         }
3021
3022         /* Stop all network ports */
3023         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3024                 if (network_table[i] &&
3025                     (network_table[i]->interface == iface)) {
3026                         result = hso_stop_net_device(network_table[i]);
3027                         if (result)
3028                                 goto out;
3029                 }
3030         }
3031
3032 out:
3033         return 0;
3034 }
3035
3036 /* called by kernel when we need to resume device */
3037 static int hso_resume(struct usb_interface *iface)
3038 {
3039         int i, result = 0;
3040         struct hso_net *hso_net;
3041
3042         /* Start all serial ports */
3043         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3044                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3045                         if (dev2ser(serial_table[i])->port.count) {
3046                                 result =
3047                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3048                                 hso_kick_transmit(dev2ser(serial_table[i]));
3049                                 if (result)
3050                                         goto out;
3051                         }
3052                 }
3053         }
3054
3055         /* Start all network ports */
3056         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3057                 if (network_table[i] &&
3058                     (network_table[i]->interface == iface)) {
3059                         hso_net = dev2net(network_table[i]);
3060                         if (hso_net->flags & IFF_UP) {
3061                                 /* First transmit any lingering data,
3062                                    then restart the device. */
3063                                 if (hso_net->skb_tx_buf) {
3064                                         dev_dbg(&iface->dev,
3065                                                 "Transmitting"
3066                                                 " lingering data\n");
3067                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3068                                                            hso_net->net);
3069                                         hso_net->skb_tx_buf = NULL;
3070                                 }
3071                                 result = hso_start_net_device(network_table[i]);
3072                                 if (result)
3073                                         goto out;
3074                         }
3075                 }
3076         }
3077
3078 out:
3079         return result;
3080 }
3081
3082 static void hso_serial_ref_free(struct kref *ref)
3083 {
3084         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3085
3086         hso_free_serial_device(hso_dev);
3087 }
3088
3089 static void hso_free_interface(struct usb_interface *interface)
3090 {
3091         struct hso_serial *serial;
3092         int i;
3093
3094         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3095                 if (serial_table[i] &&
3096                     (serial_table[i]->interface == interface)) {
3097                         serial = dev2ser(serial_table[i]);
3098                         tty_port_tty_hangup(&serial->port, false);
3099                         mutex_lock(&serial->parent->mutex);
3100                         serial->parent->usb_gone = 1;
3101                         mutex_unlock(&serial->parent->mutex);
3102                         cancel_work_sync(&serial_table[i]->async_put_intf);
3103                         cancel_work_sync(&serial_table[i]->async_get_intf);
3104                         hso_serial_tty_unregister(serial);
3105                         kref_put(&serial->parent->ref, hso_serial_ref_free);
3106                 }
3107         }
3108
3109         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3110                 if (network_table[i] &&
3111                     (network_table[i]->interface == interface)) {
3112                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3113                         /* hso_stop_net_device doesn't stop the net queue since
3114                          * traffic needs to start it again when suspended */
3115                         netif_stop_queue(dev2net(network_table[i])->net);
3116                         hso_stop_net_device(network_table[i]);
3117                         cancel_work_sync(&network_table[i]->async_put_intf);
3118                         cancel_work_sync(&network_table[i]->async_get_intf);
3119                         if (rfk) {
3120                                 rfkill_unregister(rfk);
3121                                 rfkill_destroy(rfk);
3122                         }
3123                         hso_free_net_device(network_table[i], false);
3124                 }
3125         }
3126 }
3127
3128 /* Helper functions */
3129
3130 /* Get the endpoint ! */
3131 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3132                                                   int type, int dir)
3133 {
3134         int i;
3135         struct usb_host_interface *iface = intf->cur_altsetting;
3136         struct usb_endpoint_descriptor *endp;
3137
3138         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3139                 endp = &iface->endpoint[i].desc;
3140                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3141                     (usb_endpoint_type(endp) == type))
3142                         return endp;
3143         }
3144
3145         return NULL;
3146 }
3147
3148 /* Get the byte that describes which ports are enabled */
3149 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3150 {
3151         int i;
3152         struct usb_host_interface *iface = intf->cur_altsetting;
3153
3154         if (iface->extralen == 3) {
3155                 *ports = iface->extra[2];
3156                 return 0;
3157         }
3158
3159         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3160                 if (iface->endpoint[i].extralen == 3) {
3161                         *ports = iface->endpoint[i].extra[2];
3162                         return 0;
3163                 }
3164         }
3165
3166         return -1;
3167 }
3168
3169 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3170 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3171                                    struct usb_device *usb, gfp_t gfp)
3172 {
3173         int result;
3174
3175         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3176                          usb_rcvintpipe(usb,
3177                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3178                          shared_int->shared_intr_buf,
3179                          1,
3180                          intr_callback, shared_int,
3181                          shared_int->intr_endp->bInterval);
3182
3183         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3184         if (result)
3185                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3186                         result);
3187
3188         return result;
3189 }
3190
3191 /* operations setup of the serial interface */
3192 static const struct tty_operations hso_serial_ops = {
3193         .open = hso_serial_open,
3194         .close = hso_serial_close,
3195         .write = hso_serial_write,
3196         .write_room = hso_serial_write_room,
3197         .cleanup = hso_serial_cleanup,
3198         .ioctl = hso_serial_ioctl,
3199         .set_termios = hso_serial_set_termios,
3200         .chars_in_buffer = hso_serial_chars_in_buffer,
3201         .tiocmget = hso_serial_tiocmget,
3202         .tiocmset = hso_serial_tiocmset,
3203         .get_icount = hso_get_count,
3204         .unthrottle = hso_unthrottle
3205 };
3206
3207 static struct usb_driver hso_driver = {
3208         .name = driver_name,
3209         .probe = hso_probe,
3210         .disconnect = hso_disconnect,
3211         .id_table = hso_ids,
3212         .suspend = hso_suspend,
3213         .resume = hso_resume,
3214         .reset_resume = hso_resume,
3215         .supports_autosuspend = 1,
3216         .disable_hub_initiated_lpm = 1,
3217 };
3218
3219 static int __init hso_init(void)
3220 {
3221         int i;
3222         int result;
3223
3224         /* put it in the log */
3225         pr_info("%s\n", version);
3226
3227         /* Initialise the serial table semaphore and table */
3228         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3229                 serial_table[i] = NULL;
3230
3231         /* allocate our driver using the proper amount of supported minors */
3232         tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3233         if (!tty_drv)
3234                 return -ENOMEM;
3235
3236         /* fill in all needed values */
3237         tty_drv->driver_name = driver_name;
3238         tty_drv->name = tty_filename;
3239
3240         /* if major number is provided as parameter, use that one */
3241         if (tty_major)
3242                 tty_drv->major = tty_major;
3243
3244         tty_drv->minor_start = 0;
3245         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3246         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3247         tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3248         tty_drv->init_termios = tty_std_termios;
3249         hso_init_termios(&tty_drv->init_termios);
3250         tty_set_operations(tty_drv, &hso_serial_ops);
3251
3252         /* register the tty driver */
3253         result = tty_register_driver(tty_drv);
3254         if (result) {
3255                 pr_err("%s - tty_register_driver failed(%d)\n",
3256                        __func__, result);
3257                 goto err_free_tty;
3258         }
3259
3260         /* register this module as an usb driver */
3261         result = usb_register(&hso_driver);
3262         if (result) {
3263                 pr_err("Could not register hso driver - error: %d\n", result);
3264                 goto err_unreg_tty;
3265         }
3266
3267         /* done */
3268         return 0;
3269 err_unreg_tty:
3270         tty_unregister_driver(tty_drv);
3271 err_free_tty:
3272         put_tty_driver(tty_drv);
3273         return result;
3274 }
3275
3276 static void __exit hso_exit(void)
3277 {
3278         pr_info("unloaded\n");
3279
3280         tty_unregister_driver(tty_drv);
3281         /* deregister the usb driver */
3282         usb_deregister(&hso_driver);
3283         put_tty_driver(tty_drv);
3284 }
3285
3286 /* Module definitions */
3287 module_init(hso_init);
3288 module_exit(hso_exit);
3289
3290 MODULE_AUTHOR(MOD_AUTHOR);
3291 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3292 MODULE_LICENSE("GPL");
3293
3294 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3295 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3296 module_param(debug, int, 0644);
3297
3298 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3299 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3300 module_param(tty_major, int, 0644);
3301
3302 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3303 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3304 module_param(disable_net, int, 0644);