drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <[email protected]>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB              0x0856
 123 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 124 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 125 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 126 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 127 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 128 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 129 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 130 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 131 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 132 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 133 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 134 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 135 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 136
 137 /* This driver also supports
 138  * ATEN UC2324 device using Moschip MCS7840
 139  * ATEN UC2322 device using Moschip MCS7820
 140  */
 141 #define USB_VENDOR_ID_ATENINTL          0x0557
 142 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 143 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 144
 145 /* Interrupt Routine Defines    */
 146
 147 #define SERIAL_IIR_RLS      0x06
 148 #define SERIAL_IIR_MS       0x00
 149
 150 /*
 151  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 152  */
 153 #define SERIAL_LSR_DR       0x0001
 154 #define SERIAL_LSR_OE       0x0002
 155 #define SERIAL_LSR_PE       0x0004
 156 #define SERIAL_LSR_FE       0x0008
 157 #define SERIAL_LSR_BI       0x0010
 158
 159 #define MOS_MSR_DELTA_CTS   0x10
 160 #define MOS_MSR_DELTA_DSR   0x20
 161 #define MOS_MSR_DELTA_RI    0x40
 162 #define MOS_MSR_DELTA_CD    0x80
 163
 164 /* Serial Port register Address */
 165 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 166 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 167 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 168 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 169 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 170 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 171 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 172 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 173 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 174
 175 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 176 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 177
 178 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 179
 180 /*
 181  * URB POOL related defines
 182  */
 183 #define NUM_URBS                        16      /* URB Count */
 184 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 185
 186
 187 static const struct usb_device_id moschip_port_id_table[] = {
 188         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 204         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 205         {}                      /* terminating entry */
 206 };
 207
 208 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 209         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 210         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 211         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 212         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 213         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 214         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 215         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 216         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 217         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 218         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 219         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 220         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 221         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 222         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 223         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 224         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 225         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 226         {}                      /* terminating entry */
 227 };
 228
 229 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 230
 231 /* This structure holds all of the local port information */
 232
 233 struct moschip_port {
 234         int port_num;           /*Actual port number in the device(1,2,etc) */
 235         struct urb *write_urb;  /* write URB for this port */
 236         struct urb *read_urb;   /* read URB for this port */
 237         struct urb *int_urb;
 238         __u8 shadowLCR;         /* last LCR value received */
 239         __u8 shadowMCR;         /* last MCR value received */
 240         char open;
 241         char open_ports;
 242         char zombie;
 243         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 244         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 245         int delta_msr_cond;
 246         struct async_icount icount;
 247         struct usb_serial_port *port;   /* loop back to the owner of this object */
 248
 249         /* Offsets */
 250         __u8 SpRegOffset;
 251         __u8 ControlRegOffset;
 252         __u8 DcrRegOffset;
 253         /* for processing control URBS in interrupt context */
 254         struct urb *control_urb;
 255         struct usb_ctrlrequest *dr;
 256         char *ctrl_buf;
 257         int MsrLsr;
 258
 259         spinlock_t pool_lock;
 260         struct urb *write_urb_pool[NUM_URBS];
 261         char busy[NUM_URBS];
 262         bool read_urb_busy;
 263 };
 264
 265
 266 static int debug;
 267
 268 /*
 269  * mos7840_set_reg_sync
 270  *      To set the Control register by calling usb_fill_control_urb function
 271  *      by passing usb_sndctrlpipe function as parameter.
 272  */
 273
 274 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 275                                 __u16 val)
 276 {
 277         struct usb_device *dev = port->serial->dev;
 278         val = val & 0x00ff;
 279         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 280
 281         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 282                                MCS_WR_RTYPE, val, reg, NULL, 0,
 283                                MOS_WDR_TIMEOUT);
 284 }
 285
 286 /*
 287  * mos7840_get_reg_sync
 288  *      To set the Uart register by calling usb_fill_control_urb function by
 289  *      passing usb_rcvctrlpipe function as parameter.
 290  */
 291
 292 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 293                                 __u16 *val)
 294 {
 295         struct usb_device *dev = port->serial->dev;
 296         int ret = 0;
 297         u8 *buf;
 298
 299         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 300         if (!buf)
 301                 return -ENOMEM;
 302
 303         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 304                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 305                               MOS_WDR_TIMEOUT);
 306         *val = buf[0];
 307         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 308
 309         kfree(buf);
 310         return ret;
 311 }
 312
 313 /*
 314  * mos7840_set_uart_reg
 315  *      To set the Uart register by calling usb_fill_control_urb function by
 316  *      passing usb_sndctrlpipe function as parameter.
 317  */
 318
 319 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 320                                 __u16 val)
 321 {
 322
 323         struct usb_device *dev = port->serial->dev;
 324         val = val & 0x00ff;
 325         /* For the UART control registers, the application number need
 326            to be Or'ed */
 327         if (port->serial->num_ports == 4) {
 328                 val |= (((__u16) port->number -
 329                                 (__u16) (port->serial->minor)) + 1) << 8;
 330                 dbg("mos7840_set_uart_reg application number is %x", val);
 331         } else {
 332                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 333                         val |= (((__u16) port->number -
 334                               (__u16) (port->serial->minor)) + 1) << 8;
 335                         dbg("mos7840_set_uart_reg application number is %x",
 336                             val);
 337                 } else {
 338                         val |=
 339                             (((__u16) port->number -
 340                               (__u16) (port->serial->minor)) + 2) << 8;
 341                         dbg("mos7840_set_uart_reg application number is %x",
 342                             val);
 343                 }
 344         }
 345         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 346                                MCS_WR_RTYPE, val, reg, NULL, 0,
 347                                MOS_WDR_TIMEOUT);
 348
 349 }
 350
 351 /*
 352  * mos7840_get_uart_reg
 353  *      To set the Control register by calling usb_fill_control_urb function
 354  *      by passing usb_rcvctrlpipe function as parameter.
 355  */
 356 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 357                                 __u16 *val)
 358 {
 359         struct usb_device *dev = port->serial->dev;
 360         int ret = 0;
 361         __u16 Wval;
 362         u8 *buf;
 363
 364         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 365         if (!buf)
 366                 return -ENOMEM;
 367
 368         /* dbg("application number is %4x",
 369             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 370         /* Wval  is same as application number */
 371         if (port->serial->num_ports == 4) {
 372                 Wval =
 373                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 374                      1) << 8;
 375                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 376         } else {
 377                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 378                         Wval = (((__u16) port->number -
 379                               (__u16) (port->serial->minor)) + 1) << 8;
 380                         dbg("mos7840_get_uart_reg application number is %x",
 381                             Wval);
 382                 } else {
 383                         Wval = (((__u16) port->number -
 384                               (__u16) (port->serial->minor)) + 2) << 8;
 385                         dbg("mos7840_get_uart_reg application number is %x",
 386                             Wval);
 387                 }
 388         }
 389         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 390                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 391                               MOS_WDR_TIMEOUT);
 392         *val = buf[0];
 393
 394         kfree(buf);
 395         return ret;
 396 }
 397
 398 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 399 {
 400
 401         dbg("***************************************");
 402         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 403         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 404         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 405         dbg("***************************************");
 406
 407 }
 408
 409 /************************************************************************/
 410 /************************************************************************/
 411 /*             I N T E R F A C E   F U N C T I O N S                    */
 412 /*             I N T E R F A C E   F U N C T I O N S                    */
 413 /************************************************************************/
 414 /************************************************************************/
 415
 416 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 417                                             struct moschip_port *data)
 418 {
 419         usb_set_serial_port_data(port, (void *)data);
 420 }
 421
 422 static inline struct moschip_port *mos7840_get_port_private(struct
 423                                                             usb_serial_port
 424                                                             *port)
 425 {
 426         return (struct moschip_port *)usb_get_serial_port_data(port);
 427 }
 428
 429 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 430 {
 431         struct moschip_port *mos7840_port;
 432         struct async_icount *icount;
 433         mos7840_port = port;
 434         icount = &mos7840_port->icount;
 435         if (new_msr &
 436             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 437              MOS_MSR_DELTA_CD)) {
 438                 icount = &mos7840_port->icount;
 439
 440                 /* update input line counters */
 441                 if (new_msr & MOS_MSR_DELTA_CTS) {
 442                         icount->cts++;
 443                         smp_wmb();
 444                 }
 445                 if (new_msr & MOS_MSR_DELTA_DSR) {
 446                         icount->dsr++;
 447                         smp_wmb();
 448                 }
 449                 if (new_msr & MOS_MSR_DELTA_CD) {
 450                         icount->dcd++;
 451                         smp_wmb();
 452                 }
 453                 if (new_msr & MOS_MSR_DELTA_RI) {
 454                         icount->rng++;
 455                         smp_wmb();
 456                 }
 457         }
 458 }
 459
 460 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 461 {
 462         struct async_icount *icount;
 463
 464         dbg("%s - %02x", __func__, new_lsr);
 465
 466         if (new_lsr & SERIAL_LSR_BI) {
 467                 /*
 468                  * Parity and Framing errors only count if they
 469                  * occur exclusive of a break being
 470                  * received.
 471                  */
 472                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 473         }
 474
 475         /* update input line counters */
 476         icount = &port->icount;
 477         if (new_lsr & SERIAL_LSR_BI) {
 478                 icount->brk++;
 479                 smp_wmb();
 480         }
 481         if (new_lsr & SERIAL_LSR_OE) {
 482                 icount->overrun++;
 483                 smp_wmb();
 484         }
 485         if (new_lsr & SERIAL_LSR_PE) {
 486                 icount->parity++;
 487                 smp_wmb();
 488         }
 489         if (new_lsr & SERIAL_LSR_FE) {
 490                 icount->frame++;
 491                 smp_wmb();
 492         }
 493 }
 494
 495 /************************************************************************/
 496 /************************************************************************/
 497 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 498 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 499 /************************************************************************/
 500 /************************************************************************/
 501
 502 static void mos7840_control_callback(struct urb *urb)
 503 {
 504         unsigned char *data;
 505         struct moschip_port *mos7840_port;
 506         __u8 regval = 0x0;
 507         int result = 0;
 508         int status = urb->status;
 509
 510         mos7840_port = urb->context;
 511
 512         switch (status) {
 513         case 0:
 514                 /* success */
 515                 break;
 516         case -ECONNRESET:
 517         case -ENOENT:
 518         case -ESHUTDOWN:
 519                 /* this urb is terminated, clean up */
 520                 dbg("%s - urb shutting down with status: %d", __func__,
 521                     status);
 522                 return;
 523         default:
 524                 dbg("%s - nonzero urb status received: %d", __func__,
 525                     status);
 526                 goto exit;
 527         }
 528
 529         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 530         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 531             mos7840_port->MsrLsr, mos7840_port->port_num);
 532         data = urb->transfer_buffer;
 533         regval = (__u8) data[0];
 534         dbg("%s data is %x", __func__, regval);
 535         if (mos7840_port->MsrLsr == 0)
 536                 mos7840_handle_new_msr(mos7840_port, regval);
 537         else if (mos7840_port->MsrLsr == 1)
 538                 mos7840_handle_new_lsr(mos7840_port, regval);
 539
 540 exit:
 541         spin_lock(&mos7840_port->pool_lock);
 542         if (!mos7840_port->zombie)
 543                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 544         spin_unlock(&mos7840_port->pool_lock);
 545         if (result) {
 546                 dev_err(&urb->dev->dev,
 547                         "%s - Error %d submitting interrupt urb\n",
 548                         __func__, result);
 549         }
 550 }
 551
 552 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 553                            __u16 *val)
 554 {
 555         struct usb_device *dev = mcs->port->serial->dev;
 556         struct usb_ctrlrequest *dr = mcs->dr;
 557         unsigned char *buffer = mcs->ctrl_buf;
 558         int ret;
 559
 560         dr->bRequestType = MCS_RD_RTYPE;
 561         dr->bRequest = MCS_RDREQ;
 562         dr->wValue = cpu_to_le16(Wval); /* 0 */
 563         dr->wIndex = cpu_to_le16(reg);
 564         dr->wLength = cpu_to_le16(2);
 565
 566         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 567                              (unsigned char *)dr, buffer, 2,
 568                              mos7840_control_callback, mcs);
 569         mcs->control_urb->transfer_buffer_length = 2;
 570         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 571         return ret;
 572 }
 573
 574 /*****************************************************************************
 575  * mos7840_interrupt_callback
 576  *      this is the callback function for when we have received data on the
 577  *      interrupt endpoint.
 578  *****************************************************************************/
 579
 580 static void mos7840_interrupt_callback(struct urb *urb)
 581 {
 582         int result;
 583         int length;
 584         struct moschip_port *mos7840_port;
 585         struct usb_serial *serial;
 586         __u16 Data;
 587         unsigned char *data;
 588         __u8 sp[5], st;
 589         int i, rv = 0;
 590         __u16 wval, wreg = 0;
 591         int status = urb->status;
 592
 593         dbg("%s", " : Entering");
 594
 595         switch (status) {
 596         case 0:
 597                 /* success */
 598                 break;
 599         case -ECONNRESET:
 600         case -ENOENT:
 601         case -ESHUTDOWN:
 602                 /* this urb is terminated, clean up */
 603                 dbg("%s - urb shutting down with status: %d", __func__,
 604                     status);
 605                 return;
 606         default:
 607                 dbg("%s - nonzero urb status received: %d", __func__,
 608                     status);
 609                 goto exit;
 610         }
 611
 612         length = urb->actual_length;
 613         data = urb->transfer_buffer;
 614
 615         serial = urb->context;
 616
 617         /* Moschip get 5 bytes
 618          * Byte 1 IIR Port 1 (port.number is 0)
 619          * Byte 2 IIR Port 2 (port.number is 1)
 620          * Byte 3 IIR Port 3 (port.number is 2)
 621          * Byte 4 IIR Port 4 (port.number is 3)
 622          * Byte 5 FIFO status for both */
 623
 624         if (length && length > 5) {
 625                 dbg("%s", "Wrong data !!!");
 626                 return;
 627         }
 628
 629         sp[0] = (__u8) data[0];
 630         sp[1] = (__u8) data[1];
 631         sp[2] = (__u8) data[2];
 632         sp[3] = (__u8) data[3];
 633         st = (__u8) data[4];
 634
 635         for (i = 0; i < serial->num_ports; i++) {
 636                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 637                 wval =
 638                     (((__u16) serial->port[i]->number -
 639                       (__u16) (serial->minor)) + 1) << 8;
 640                 if (mos7840_port->open) {
 641                         if (sp[i] & 0x01) {
 642                                 dbg("SP%d No Interrupt !!!", i);
 643                         } else {
 644                                 switch (sp[i] & 0x0f) {
 645                                 case SERIAL_IIR_RLS:
 646                                         dbg("Serial Port %d: Receiver status error or ", i);
 647                                         dbg("address bit detected in 9-bit mode");
 648                                         mos7840_port->MsrLsr = 1;
 649                                         wreg = LINE_STATUS_REGISTER;
 650                                         break;
 651                                 case SERIAL_IIR_MS:
 652                                         dbg("Serial Port %d: Modem status change", i);
 653                                         mos7840_port->MsrLsr = 0;
 654                                         wreg = MODEM_STATUS_REGISTER;
 655                                         break;
 656                                 }
 657                                 spin_lock(&mos7840_port->pool_lock);
 658                                 if (!mos7840_port->zombie) {
 659                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 660                                 } else {
 661                                         spin_unlock(&mos7840_port->pool_lock);
 662                                         return;
 663                                 }
 664                                 spin_unlock(&mos7840_port->pool_lock);
 665                         }
 666                 }
 667         }
 668         if (!(rv < 0))
 669                 /* the completion handler for the control urb will resubmit */
 670                 return;
 671 exit:
 672         result = usb_submit_urb(urb, GFP_ATOMIC);
 673         if (result) {
 674                 dev_err(&urb->dev->dev,
 675                         "%s - Error %d submitting interrupt urb\n",
 676                         __func__, result);
 677         }
 678 }
 679
 680 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 681                                        const char *function)
 682 {
 683         if (!port) {
 684                 dbg("%s - port == NULL", function);
 685                 return -1;
 686         }
 687         if (!port->serial) {
 688                 dbg("%s - port->serial == NULL", function);
 689                 return -1;
 690         }
 691
 692         return 0;
 693 }
 694
 695 /* Inline functions to check the sanity of a pointer that is passed to us */
 696 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 697                                          const char *function)
 698 {
 699         if (!serial) {
 700                 dbg("%s - serial == NULL", function);
 701                 return -1;
 702         }
 703         if (!serial->type) {
 704                 dbg("%s - serial->type == NULL!", function);
 705                 return -1;
 706         }
 707
 708         return 0;
 709 }
 710
 711 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 712                                                  const char *function)
 713 {
 714         /* if no port was specified, or it fails a paranoia check */
 715         if (!port ||
 716             mos7840_port_paranoia_check(port, function) ||
 717             mos7840_serial_paranoia_check(port->serial, function)) {
 718                 /* then say that we don't have a valid usb_serial thing,
 719                  * which will end up genrating -ENODEV return values */
 720                 return NULL;
 721         }
 722
 723         return port->serial;
 724 }
 725
 726 /*****************************************************************************
 727  * mos7840_bulk_in_callback
 728  *      this is the callback function for when we have received data on the
 729  *      bulk in endpoint.
 730  *****************************************************************************/
 731
 732 static void mos7840_bulk_in_callback(struct urb *urb)
 733 {
 734         int retval;
 735         unsigned char *data;
 736         struct usb_serial *serial;
 737         struct usb_serial_port *port;
 738         struct moschip_port *mos7840_port;
 739         struct tty_struct *tty;
 740         int status = urb->status;
 741
 742         mos7840_port = urb->context;
 743         if (!mos7840_port) {
 744                 dbg("%s", "NULL mos7840_port pointer");
 745                 return;
 746         }
 747
 748         if (status) {
 749                 dbg("nonzero read bulk status received: %d", status);
 750                 mos7840_port->read_urb_busy = false;
 751                 return;
 752         }
 753
 754         port = (struct usb_serial_port *)mos7840_port->port;
 755         if (mos7840_port_paranoia_check(port, __func__)) {
 756                 dbg("%s", "Port Paranoia failed");
 757                 mos7840_port->read_urb_busy = false;
 758                 return;
 759         }
 760
 761         serial = mos7840_get_usb_serial(port, __func__);
 762         if (!serial) {
 763                 dbg("%s", "Bad serial pointer");
 764                 mos7840_port->read_urb_busy = false;
 765                 return;
 766         }
 767
 768         dbg("%s", "Entering... ");
 769
 770         data = urb->transfer_buffer;
 771
 772         dbg("%s", "Entering ...........");
 773
 774         if (urb->actual_length) {
 775                 tty = tty_port_tty_get(&mos7840_port->port->port);
 776                 if (tty) {
 777                         tty_insert_flip_string(tty, data, urb->actual_length);
 778                         dbg(" %s ", data);
 779                         tty_flip_buffer_push(tty);
 780                         tty_kref_put(tty);
 781                 }
 782                 mos7840_port->icount.rx += urb->actual_length;
 783                 smp_wmb();
 784                 dbg("mos7840_port->icount.rx is %d:",
 785                     mos7840_port->icount.rx);
 786         }
 787
 788         if (!mos7840_port->read_urb) {
 789                 dbg("%s", "URB KILLED !!!");
 790                 mos7840_port->read_urb_busy = false;
 791                 return;
 792         }
 793
 794
 795         mos7840_port->read_urb->dev = serial->dev;
 796
 797         mos7840_port->read_urb_busy = true;
 798         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 799
 800         if (retval) {
 801                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 802                 mos7840_port->read_urb_busy = false;
 803         }
 804 }
 805
 806 /*****************************************************************************
 807  * mos7840_bulk_out_data_callback
 808  *      this is the callback function for when we have finished sending
 809  *      serial data on the bulk out endpoint.
 810  *****************************************************************************/
 811
 812 static void mos7840_bulk_out_data_callback(struct urb *urb)
 813 {
 814         struct moschip_port *mos7840_port;
 815         struct tty_struct *tty;
 816         int status = urb->status;
 817         int i;
 818
 819         mos7840_port = urb->context;
 820         spin_lock(&mos7840_port->pool_lock);
 821         for (i = 0; i < NUM_URBS; i++) {
 822                 if (urb == mos7840_port->write_urb_pool[i]) {
 823                         mos7840_port->busy[i] = 0;
 824                         break;
 825                 }
 826         }
 827         spin_unlock(&mos7840_port->pool_lock);
 828
 829         if (status) {
 830                 dbg("nonzero write bulk status received:%d", status);
 831                 return;
 832         }
 833
 834         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 835                 dbg("%s", "Port Paranoia failed");
 836                 return;
 837         }
 838
 839         dbg("%s", "Entering .........");
 840
 841         tty = tty_port_tty_get(&mos7840_port->port->port);
 842         if (tty && mos7840_port->open)
 843                 tty_wakeup(tty);
 844         tty_kref_put(tty);
 845
 846 }
 847
 848 /************************************************************************/
 849 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 850 /************************************************************************/
 851 #ifdef MCSSerialProbe
 852 static int mos7840_serial_probe(struct usb_serial *serial,
 853                                 const struct usb_device_id *id)
 854 {
 855
 856         /*need to implement the mode_reg reading and updating\
 857            structures usb_serial_ device_type\
 858            (i.e num_ports, num_bulkin,bulkout etc) */
 859         /* Also we can update the changes  attach */
 860         return 1;
 861 }
 862 #endif
 863
 864 /*****************************************************************************
 865  * mos7840_open
 866  *      this function is called by the tty driver when a port is opened
 867  *      If successful, we return 0
 868  *      Otherwise we return a negative error number.
 869  *****************************************************************************/
 870
 871 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 872 {
 873         int response;
 874         int j;
 875         struct usb_serial *serial;
 876         struct urb *urb;
 877         __u16 Data;
 878         int status;
 879         struct moschip_port *mos7840_port;
 880         struct moschip_port *port0;
 881
 882         dbg ("%s enter", __func__);
 883
 884         if (mos7840_port_paranoia_check(port, __func__)) {
 885                 dbg("%s", "Port Paranoia failed");
 886                 return -ENODEV;
 887         }
 888
 889         serial = port->serial;
 890
 891         if (mos7840_serial_paranoia_check(serial, __func__)) {
 892                 dbg("%s", "Serial Paranoia failed");
 893                 return -ENODEV;
 894         }
 895
 896         mos7840_port = mos7840_get_port_private(port);
 897         port0 = mos7840_get_port_private(serial->port[0]);
 898
 899         if (mos7840_port == NULL || port0 == NULL)
 900                 return -ENODEV;
 901
 902         usb_clear_halt(serial->dev, port->write_urb->pipe);
 903         usb_clear_halt(serial->dev, port->read_urb->pipe);
 904         port0->open_ports++;
 905
 906         /* Initialising the write urb pool */
 907         for (j = 0; j < NUM_URBS; ++j) {
 908                 urb = usb_alloc_urb(0, GFP_KERNEL);
 909                 mos7840_port->write_urb_pool[j] = urb;
 910
 911                 if (urb == NULL) {
 912                         dev_err(&port->dev, "No more urbs???\n");
 913                         continue;
 914                 }
 915
 916                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 917                                                                 GFP_KERNEL);
 918                 if (!urb->transfer_buffer) {
 919                         usb_free_urb(urb);
 920                         mos7840_port->write_urb_pool[j] = NULL;
 921                         dev_err(&port->dev,
 922                                 "%s-out of memory for urb buffers.\n",
 923                                 __func__);
 924                         continue;
 925                 }
 926         }
 927
 928 /*****************************************************************************
 929  * Initialize MCS7840 -- Write Init values to corresponding Registers
 930  *
 931  * Register Index
 932  * 1 : IER
 933  * 2 : FCR
 934  * 3 : LCR
 935  * 4 : MCR
 936  *
 937  * 0x08 : SP1/2 Control Reg
 938  *****************************************************************************/
 939
 940         /* NEED to check the following Block */
 941
 942         Data = 0x0;
 943         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 944         if (status < 0) {
 945                 dbg("Reading Spreg failed");
 946                 return -1;
 947         }
 948         Data |= 0x80;
 949         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 950         if (status < 0) {
 951                 dbg("writing Spreg failed");
 952                 return -1;
 953         }
 954
 955         Data &= ~0x80;
 956         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 957         if (status < 0) {
 958                 dbg("writing Spreg failed");
 959                 return -1;
 960         }
 961         /* End of block to be checked */
 962
 963         Data = 0x0;
 964         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 965                                                                         &Data);
 966         if (status < 0) {
 967                 dbg("Reading Controlreg failed");
 968                 return -1;
 969         }
 970         Data |= 0x08;           /* Driver done bit */
 971         Data |= 0x20;           /* rx_disable */
 972         status = mos7840_set_reg_sync(port,
 973                                 mos7840_port->ControlRegOffset, Data);
 974         if (status < 0) {
 975                 dbg("writing Controlreg failed");
 976                 return -1;
 977         }
 978         /* do register settings here */
 979         /* Set all regs to the device default values. */
 980         /***********************************
 981          * First Disable all interrupts.
 982          ***********************************/
 983         Data = 0x00;
 984         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 985         if (status < 0) {
 986                 dbg("disabling interrupts failed");
 987                 return -1;
 988         }
 989         /* Set FIFO_CONTROL_REGISTER to the default value */
 990         Data = 0x00;
 991         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 992         if (status < 0) {
 993                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 994                 return -1;
 995         }
 996
 997         Data = 0xcf;
 998         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 999         if (status < 0) {
1000                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
1001                 return -1;
1002         }
1003
1004         Data = 0x03;
1005         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1006         mos7840_port->shadowLCR = Data;
1007
1008         Data = 0x0b;
1009         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1010         mos7840_port->shadowMCR = Data;
1011
1012         Data = 0x00;
1013         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1014         mos7840_port->shadowLCR = Data;
1015
1016         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1017         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1018
1019         Data = 0x0c;
1020         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1021
1022         Data = 0x0;
1023         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1024
1025         Data = 0x00;
1026         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1027
1028         Data = Data & ~SERIAL_LCR_DLAB;
1029         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1030         mos7840_port->shadowLCR = Data;
1031
1032         /* clearing Bulkin and Bulkout Fifo */
1033         Data = 0x0;
1034         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1035
1036         Data = Data | 0x0c;
1037         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1038
1039         Data = Data & ~0x0c;
1040         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1041         /* Finally enable all interrupts */
1042         Data = 0x0c;
1043         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1044
1045         /* clearing rx_disable */
1046         Data = 0x0;
1047         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1048                                                                         &Data);
1049         Data = Data & ~0x20;
1050         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1051                                                                         Data);
1052
1053         /* rx_negate */
1054         Data = 0x0;
1055         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1056                                                                         &Data);
1057         Data = Data | 0x10;
1058         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1059                                                                         Data);
1060
1061         /* Check to see if we've set up our endpoint info yet    *
1062          * (can't set it up in mos7840_startup as the structures *
1063          * were not set up at that time.)                        */
1064         if (port0->open_ports == 1) {
1065                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1066                         /* set up interrupt urb */
1067                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1068                                 serial->dev,
1069                                 usb_rcvintpipe(serial->dev,
1070                                 serial->port[0]->interrupt_in_endpointAddress),
1071                                 serial->port[0]->interrupt_in_buffer,
1072                                 serial->port[0]->interrupt_in_urb->
1073                                 transfer_buffer_length,
1074                                 mos7840_interrupt_callback,
1075                                 serial,
1076                                 serial->port[0]->interrupt_in_urb->interval);
1077
1078                         /* start interrupt read for mos7840               *
1079                          * will continue as long as mos7840 is connected  */
1080
1081                         response =
1082                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1083                                            GFP_KERNEL);
1084                         if (response) {
1085                                 dev_err(&port->dev, "%s - Error %d submitting "
1086                                         "interrupt urb\n", __func__, response);
1087                         }
1088
1089                 }
1090
1091         }
1092
1093         /* see if we've set up our endpoint info yet   *
1094          * (can't set it up in mos7840_startup as the  *
1095          * structures were not set up at that time.)   */
1096
1097         dbg("port number is %d", port->number);
1098         dbg("serial number is %d", port->serial->minor);
1099         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1100         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1101         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1102         dbg("port's number in the device is %d", mos7840_port->port_num);
1103         mos7840_port->read_urb = port->read_urb;
1104
1105         /* set up our bulk in urb */
1106
1107         usb_fill_bulk_urb(mos7840_port->read_urb,
1108                           serial->dev,
1109                           usb_rcvbulkpipe(serial->dev,
1110                                           port->bulk_in_endpointAddress),
1111                           port->bulk_in_buffer,
1112                           mos7840_port->read_urb->transfer_buffer_length,
1113                           mos7840_bulk_in_callback, mos7840_port);
1114
1115         dbg("mos7840_open: bulkin endpoint is %d",
1116             port->bulk_in_endpointAddress);
1117         mos7840_port->read_urb_busy = true;
1118         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1119         if (response) {
1120                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1121                         __func__, response);
1122                 mos7840_port->read_urb_busy = false;
1123         }
1124
1125         /* initialize our wait queues */
1126         init_waitqueue_head(&mos7840_port->wait_chase);
1127         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1128
1129         /* initialize our icount structure */
1130         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1131
1132         /* initialize our port settings */
1133         /* Must set to enable ints! */
1134         mos7840_port->shadowMCR = MCR_MASTER_IE;
1135         /* send a open port command */
1136         mos7840_port->open = 1;
1137         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1138         mos7840_port->icount.tx = 0;
1139         mos7840_port->icount.rx = 0;
1140
1141         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1142                                 serial, mos7840_port, port);
1143
1144         dbg ("%s leave", __func__);
1145
1146         return 0;
1147
1148 }
1149
1150 /*****************************************************************************
1151  * mos7840_chars_in_buffer
1152  *      this function is called by the tty driver when it wants to know how many
1153  *      bytes of data we currently have outstanding in the port (data that has
1154  *      been written, but hasn't made it out the port yet)
1155  *      If successful, we return the number of bytes left to be written in the
1156  *      system,
1157  *      Otherwise we return zero.
1158  *****************************************************************************/
1159
1160 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1161 {
1162         struct usb_serial_port *port = tty->driver_data;
1163         int i;
1164         int chars = 0;
1165         unsigned long flags;
1166         struct moschip_port *mos7840_port;
1167
1168         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1169
1170         if (mos7840_port_paranoia_check(port, __func__)) {
1171                 dbg("%s", "Invalid port");
1172                 return 0;
1173         }
1174
1175         mos7840_port = mos7840_get_port_private(port);
1176         if (mos7840_port == NULL) {
1177                 dbg("%s", "mos7840_break:leaving ...........");
1178                 return 0;
1179         }
1180
1181         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1182         for (i = 0; i < NUM_URBS; ++i)
1183                 if (mos7840_port->busy[i])
1184                         chars += URB_TRANSFER_BUFFER_SIZE;
1185         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1186         dbg("%s - returns %d", __func__, chars);
1187         return chars;
1188
1189 }
1190
1191 /*****************************************************************************
1192  * mos7840_close
1193  *      this function is called by the tty driver when a port is closed
1194  *****************************************************************************/
1195
1196 static void mos7840_close(struct usb_serial_port *port)
1197 {
1198         struct usb_serial *serial;
1199         struct moschip_port *mos7840_port;
1200         struct moschip_port *port0;
1201         int j;
1202         __u16 Data;
1203
1204         dbg("%s", "mos7840_close:entering...");
1205
1206         if (mos7840_port_paranoia_check(port, __func__)) {
1207                 dbg("%s", "Port Paranoia failed");
1208                 return;
1209         }
1210
1211         serial = mos7840_get_usb_serial(port, __func__);
1212         if (!serial) {
1213                 dbg("%s", "Serial Paranoia failed");
1214                 return;
1215         }
1216
1217         mos7840_port = mos7840_get_port_private(port);
1218         port0 = mos7840_get_port_private(serial->port[0]);
1219
1220         if (mos7840_port == NULL || port0 == NULL)
1221                 return;
1222
1223         for (j = 0; j < NUM_URBS; ++j)
1224                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1225
1226         /* Freeing Write URBs */
1227         for (j = 0; j < NUM_URBS; ++j) {
1228                 if (mos7840_port->write_urb_pool[j]) {
1229                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1230                                 kfree(mos7840_port->write_urb_pool[j]->
1231                                       transfer_buffer);
1232
1233                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1234                 }
1235         }
1236
1237         /* While closing port, shutdown all bulk read, write  *
1238          * and interrupt read if they exists                  */
1239         if (serial->dev) {
1240                 if (mos7840_port->write_urb) {
1241                         dbg("%s", "Shutdown bulk write");
1242                         usb_kill_urb(mos7840_port->write_urb);
1243                 }
1244                 if (mos7840_port->read_urb) {
1245                         dbg("%s", "Shutdown bulk read");
1246                         usb_kill_urb(mos7840_port->read_urb);
1247                         mos7840_port->read_urb_busy = false;
1248                 }
1249                 if ((&mos7840_port->control_urb)) {
1250                         dbg("%s", "Shutdown control read");
1251                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1252                 }
1253         }
1254 /*      if(mos7840_port->ctrl_buf != NULL) */
1255 /*              kfree(mos7840_port->ctrl_buf); */
1256         port0->open_ports--;
1257         dbg("mos7840_num_open_ports in close%d:in port%d",
1258             port0->open_ports, port->number);
1259         if (port0->open_ports == 0) {
1260                 if (serial->port[0]->interrupt_in_urb) {
1261                         dbg("%s", "Shutdown interrupt_in_urb");
1262                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1263                 }
1264         }
1265
1266         if (mos7840_port->write_urb) {
1267                 /* if this urb had a transfer buffer already (old tx) free it */
1268                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1269                         kfree(mos7840_port->write_urb->transfer_buffer);
1270                 usb_free_urb(mos7840_port->write_urb);
1271         }
1272
1273         Data = 0x0;
1274         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1275
1276         Data = 0x00;
1277         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1278
1279         mos7840_port->open = 0;
1280
1281         dbg("%s", "Leaving ............");
1282 }
1283
1284 /************************************************************************
1285  *
1286  * mos7840_block_until_chase_response
1287  *
1288  *      This function will block the close until one of the following:
1289  *              1. Response to our Chase comes from mos7840
1290  *              2. A timeout of 10 seconds without activity has expired
1291  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1292  *
1293  ************************************************************************/
1294
1295 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1296                                         struct moschip_port *mos7840_port)
1297 {
1298         int timeout = 1 * HZ;
1299         int wait = 10;
1300         int count;
1301
1302         while (1) {
1303                 count = mos7840_chars_in_buffer(tty);
1304
1305                 /* Check for Buffer status */
1306                 if (count <= 0)
1307                         return;
1308
1309                 /* Block the thread for a while */
1310                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1311                                                timeout);
1312                 /* No activity.. count down section */
1313                 wait--;
1314                 if (wait == 0) {
1315                         dbg("%s - TIMEOUT", __func__);
1316                         return;
1317                 } else {
1318                         /* Reset timeout value back to seconds */
1319                         wait = 10;
1320                 }
1321         }
1322
1323 }
1324
1325 /*****************************************************************************
1326  * mos7840_break
1327  *      this function sends a break to the port
1328  *****************************************************************************/
1329 static void mos7840_break(struct tty_struct *tty, int break_state)
1330 {
1331         struct usb_serial_port *port = tty->driver_data;
1332         unsigned char data;
1333         struct usb_serial *serial;
1334         struct moschip_port *mos7840_port;
1335
1336         dbg("%s", "Entering ...........");
1337         dbg("mos7840_break: Start");
1338
1339         if (mos7840_port_paranoia_check(port, __func__)) {
1340                 dbg("%s", "Port Paranoia failed");
1341                 return;
1342         }
1343
1344         serial = mos7840_get_usb_serial(port, __func__);
1345         if (!serial) {
1346                 dbg("%s", "Serial Paranoia failed");
1347                 return;
1348         }
1349
1350         mos7840_port = mos7840_get_port_private(port);
1351
1352         if (mos7840_port == NULL)
1353                 return;
1354
1355         if (serial->dev)
1356                 /* flush and block until tx is empty */
1357                 mos7840_block_until_chase_response(tty, mos7840_port);
1358
1359         if (break_state == -1)
1360                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1361         else
1362                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1363
1364         /* FIXME: no locking on shadowLCR anywhere in driver */
1365         mos7840_port->shadowLCR = data;
1366         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1367             mos7840_port->shadowLCR);
1368         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1369                              mos7840_port->shadowLCR);
1370 }
1371
1372 /*****************************************************************************
1373  * mos7840_write_room
1374  *      this function is called by the tty driver when it wants to know how many
1375  *      bytes of data we can accept for a specific port.
1376  *      If successful, we return the amount of room that we have for this port
1377  *      Otherwise we return a negative error number.
1378  *****************************************************************************/
1379
1380 static int mos7840_write_room(struct tty_struct *tty)
1381 {
1382         struct usb_serial_port *port = tty->driver_data;
1383         int i;
1384         int room = 0;
1385         unsigned long flags;
1386         struct moschip_port *mos7840_port;
1387
1388         dbg("%s", " mos7840_write_room:entering ...........");
1389
1390         if (mos7840_port_paranoia_check(port, __func__)) {
1391                 dbg("%s", "Invalid port");
1392                 dbg("%s", " mos7840_write_room:leaving ...........");
1393                 return -1;
1394         }
1395
1396         mos7840_port = mos7840_get_port_private(port);
1397         if (mos7840_port == NULL) {
1398                 dbg("%s", "mos7840_break:leaving ...........");
1399                 return -1;
1400         }
1401
1402         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1403         for (i = 0; i < NUM_URBS; ++i) {
1404                 if (!mos7840_port->busy[i])
1405                         room += URB_TRANSFER_BUFFER_SIZE;
1406         }
1407         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1408
1409         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1410         dbg("%s - returns %d", __func__, room);
1411         return room;
1412
1413 }
1414
1415 /*****************************************************************************
1416  * mos7840_write
1417  *      this function is called by the tty driver when data should be written to
1418  *      the port.
1419  *      If successful, we return the number of bytes written, otherwise we
1420  *      return a negative error number.
1421  *****************************************************************************/
1422
1423 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1424                          const unsigned char *data, int count)
1425 {
1426         int status;
1427         int i;
1428         int bytes_sent = 0;
1429         int transfer_size;
1430         unsigned long flags;
1431
1432         struct moschip_port *mos7840_port;
1433         struct usb_serial *serial;
1434         struct urb *urb;
1435         /* __u16 Data; */
1436         const unsigned char *current_position = data;
1437         unsigned char *data1;
1438         dbg("%s", "entering ...........");
1439         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1440                                         mos7840_port->shadowLCR); */
1441
1442 #ifdef NOTMOS7840
1443         Data = 0x00;
1444         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1445         mos7840_port->shadowLCR = Data;
1446         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1447         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1448             mos7840_port->shadowLCR);
1449
1450         /* Data = 0x03; */
1451         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1452         /* mos7840_port->shadowLCR=Data;//Need to add later */
1453
1454         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1455         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1456
1457         /* Data = 0x0c; */
1458         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1459         Data = 0x00;
1460         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1461         dbg("mos7840_write:DLL value is %x", Data);
1462
1463         Data = 0x0;
1464         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1465         dbg("mos7840_write:DLM value is %x", Data);
1466
1467         Data = Data & ~SERIAL_LCR_DLAB;
1468         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1469             mos7840_port->shadowLCR);
1470         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1471 #endif
1472
1473         if (mos7840_port_paranoia_check(port, __func__)) {
1474                 dbg("%s", "Port Paranoia failed");
1475                 return -1;
1476         }
1477
1478         serial = port->serial;
1479         if (mos7840_serial_paranoia_check(serial, __func__)) {
1480                 dbg("%s", "Serial Paranoia failed");
1481                 return -1;
1482         }
1483
1484         mos7840_port = mos7840_get_port_private(port);
1485         if (mos7840_port == NULL) {
1486                 dbg("%s", "mos7840_port is NULL");
1487                 return -1;
1488         }
1489
1490         /* try to find a free urb in the list */
1491         urb = NULL;
1492
1493         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1494         for (i = 0; i < NUM_URBS; ++i) {
1495                 if (!mos7840_port->busy[i]) {
1496                         mos7840_port->busy[i] = 1;
1497                         urb = mos7840_port->write_urb_pool[i];
1498                         dbg("URB:%d", i);
1499                         break;
1500                 }
1501         }
1502         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1503
1504         if (urb == NULL) {
1505                 dbg("%s - no more free urbs", __func__);
1506                 goto exit;
1507         }
1508
1509         if (urb->transfer_buffer == NULL) {
1510                 urb->transfer_buffer =
1511                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1512
1513                 if (urb->transfer_buffer == NULL) {
1514                         dev_err(&port->dev, "%s no more kernel memory...\n",
1515                                 __func__);
1516                         goto exit;
1517                 }
1518         }
1519         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1520
1521         memcpy(urb->transfer_buffer, current_position, transfer_size);
1522
1523         /* fill urb with data and submit  */
1524         usb_fill_bulk_urb(urb,
1525                           serial->dev,
1526                           usb_sndbulkpipe(serial->dev,
1527                                           port->bulk_out_endpointAddress),
1528                           urb->transfer_buffer,
1529                           transfer_size,
1530                           mos7840_bulk_out_data_callback, mos7840_port);
1531
1532         data1 = urb->transfer_buffer;
1533         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1534
1535         /* send it down the pipe */
1536         status = usb_submit_urb(urb, GFP_ATOMIC);
1537
1538         if (status) {
1539                 mos7840_port->busy[i] = 0;
1540                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1541                         "with status = %d\n", __func__, status);
1542                 bytes_sent = status;
1543                 goto exit;
1544         }
1545         bytes_sent = transfer_size;
1546         mos7840_port->icount.tx += transfer_size;
1547         smp_wmb();
1548         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1549 exit:
1550         return bytes_sent;
1551
1552 }
1553
1554 /*****************************************************************************
1555  * mos7840_throttle
1556  *      this function is called by the tty driver when it wants to stop the data
1557  *      being read from the port.
1558  *****************************************************************************/
1559
1560 static void mos7840_throttle(struct tty_struct *tty)
1561 {
1562         struct usb_serial_port *port = tty->driver_data;
1563         struct moschip_port *mos7840_port;
1564         int status;
1565
1566         if (mos7840_port_paranoia_check(port, __func__)) {
1567                 dbg("%s", "Invalid port");
1568                 return;
1569         }
1570
1571         dbg("- port %d", port->number);
1572
1573         mos7840_port = mos7840_get_port_private(port);
1574
1575         if (mos7840_port == NULL)
1576                 return;
1577
1578         if (!mos7840_port->open) {
1579                 dbg("%s", "port not opened");
1580                 return;
1581         }
1582
1583         dbg("%s", "Entering ..........");
1584
1585         /* if we are implementing XON/XOFF, send the stop character */
1586         if (I_IXOFF(tty)) {
1587                 unsigned char stop_char = STOP_CHAR(tty);
1588                 status = mos7840_write(tty, port, &stop_char, 1);
1589                 if (status <= 0)
1590                         return;
1591         }
1592         /* if we are implementing RTS/CTS, toggle that line */
1593         if (tty->termios->c_cflag & CRTSCTS) {
1594                 mos7840_port->shadowMCR &= ~MCR_RTS;
1595                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1596                                          mos7840_port->shadowMCR);
1597                 if (status < 0)
1598                         return;
1599         }
1600 }
1601
1602 /*****************************************************************************
1603  * mos7840_unthrottle
1604  *      this function is called by the tty driver when it wants to resume
1605  *      the data being read from the port (called after mos7840_throttle is
1606  *      called)
1607  *****************************************************************************/
1608 static void mos7840_unthrottle(struct tty_struct *tty)
1609 {
1610         struct usb_serial_port *port = tty->driver_data;
1611         int status;
1612         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1613
1614         if (mos7840_port_paranoia_check(port, __func__)) {
1615                 dbg("%s", "Invalid port");
1616                 return;
1617         }
1618
1619         if (mos7840_port == NULL)
1620                 return;
1621
1622         if (!mos7840_port->open) {
1623                 dbg("%s - port not opened", __func__);
1624                 return;
1625         }
1626
1627         dbg("%s", "Entering ..........");
1628
1629         /* if we are implementing XON/XOFF, send the start character */
1630         if (I_IXOFF(tty)) {
1631                 unsigned char start_char = START_CHAR(tty);
1632                 status = mos7840_write(tty, port, &start_char, 1);
1633                 if (status <= 0)
1634                         return;
1635         }
1636
1637         /* if we are implementing RTS/CTS, toggle that line */
1638         if (tty->termios->c_cflag & CRTSCTS) {
1639                 mos7840_port->shadowMCR |= MCR_RTS;
1640                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1641                                          mos7840_port->shadowMCR);
1642                 if (status < 0)
1643                         return;
1644         }
1645 }
1646
1647 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1648 {
1649         struct usb_serial_port *port = tty->driver_data;
1650         struct moschip_port *mos7840_port;
1651         unsigned int result;
1652         __u16 msr;
1653         __u16 mcr;
1654         int status;
1655         mos7840_port = mos7840_get_port_private(port);
1656
1657         dbg("%s - port %d", __func__, port->number);
1658
1659         if (mos7840_port == NULL)
1660                 return -ENODEV;
1661
1662         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1663         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1664         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1665             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1666             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1667             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1668             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1669             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1670             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1671
1672         dbg("%s - 0x%04X", __func__, result);
1673
1674         return result;
1675 }
1676
1677 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1678                             unsigned int set, unsigned int clear)
1679 {
1680         struct usb_serial_port *port = tty->driver_data;
1681         struct moschip_port *mos7840_port;
1682         unsigned int mcr;
1683         int status;
1684
1685         dbg("%s - port %d", __func__, port->number);
1686
1687         mos7840_port = mos7840_get_port_private(port);
1688
1689         if (mos7840_port == NULL)
1690                 return -ENODEV;
1691
1692         /* FIXME: What locks the port registers ? */
1693         mcr = mos7840_port->shadowMCR;
1694         if (clear & TIOCM_RTS)
1695                 mcr &= ~MCR_RTS;
1696         if (clear & TIOCM_DTR)
1697                 mcr &= ~MCR_DTR;
1698         if (clear & TIOCM_LOOP)
1699                 mcr &= ~MCR_LOOPBACK;
1700
1701         if (set & TIOCM_RTS)
1702                 mcr |= MCR_RTS;
1703         if (set & TIOCM_DTR)
1704                 mcr |= MCR_DTR;
1705         if (set & TIOCM_LOOP)
1706                 mcr |= MCR_LOOPBACK;
1707
1708         mos7840_port->shadowMCR = mcr;
1709
1710         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1711         if (status < 0) {
1712                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1713                 return status;
1714         }
1715
1716         return 0;
1717 }
1718
1719 /*****************************************************************************
1720  * mos7840_calc_baud_rate_divisor
1721  *      this function calculates the proper baud rate divisor for the specified
1722  *      baud rate.
1723  *****************************************************************************/
1724 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1725                                           __u16 *clk_sel_val)
1726 {
1727
1728         dbg("%s - %d", __func__, baudRate);
1729
1730         if (baudRate <= 115200) {
1731                 *divisor = 115200 / baudRate;
1732                 *clk_sel_val = 0x0;
1733         }
1734         if ((baudRate > 115200) && (baudRate <= 230400)) {
1735                 *divisor = 230400 / baudRate;
1736                 *clk_sel_val = 0x10;
1737         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1738                 *divisor = 403200 / baudRate;
1739                 *clk_sel_val = 0x20;
1740         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1741                 *divisor = 460800 / baudRate;
1742                 *clk_sel_val = 0x30;
1743         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1744                 *divisor = 806400 / baudRate;
1745                 *clk_sel_val = 0x40;
1746         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1747                 *divisor = 921600 / baudRate;
1748                 *clk_sel_val = 0x50;
1749         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1750                 *divisor = 1572864 / baudRate;
1751                 *clk_sel_val = 0x60;
1752         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1753                 *divisor = 3145728 / baudRate;
1754                 *clk_sel_val = 0x70;
1755         }
1756         return 0;
1757
1758 #ifdef NOTMCS7840
1759
1760         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1761                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1762                         *divisor = mos7840_divisor_table[i].Divisor;
1763                         return 0;
1764                 }
1765         }
1766
1767         /* After trying for all the standard baud rates    *
1768          * Try calculating the divisor for this baud rate  */
1769
1770         if (baudrate > 75 && baudrate < 230400) {
1771                 /* get the divisor */
1772                 custom = (__u16) (230400L / baudrate);
1773
1774                 /* Check for round off */
1775                 round1 = (__u16) (2304000L / baudrate);
1776                 round = (__u16) (round1 - (custom * 10));
1777                 if (round > 4)
1778                         custom++;
1779                 *divisor = custom;
1780
1781                 dbg(" Baud %d = %d", baudrate, custom);
1782                 return 0;
1783         }
1784
1785         dbg("%s", " Baud calculation Failed...");
1786         return -1;
1787 #endif
1788 }
1789
1790 /*****************************************************************************
1791  * mos7840_send_cmd_write_baud_rate
1792  *      this function sends the proper command to change the baud rate of the
1793  *      specified port.
1794  *****************************************************************************/
1795
1796 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1797                                             int baudRate)
1798 {
1799         int divisor = 0;
1800         int status;
1801         __u16 Data;
1802         unsigned char number;
1803         __u16 clk_sel_val;
1804         struct usb_serial_port *port;
1805
1806         if (mos7840_port == NULL)
1807                 return -1;
1808
1809         port = (struct usb_serial_port *)mos7840_port->port;
1810         if (mos7840_port_paranoia_check(port, __func__)) {
1811                 dbg("%s", "Invalid port");
1812                 return -1;
1813         }
1814
1815         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1816                 dbg("%s", "Invalid Serial");
1817                 return -1;
1818         }
1819
1820         dbg("%s", "Entering ..........");
1821
1822         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1823
1824         dbg("%s - port = %d, baud = %d", __func__,
1825             mos7840_port->port->number, baudRate);
1826         /* reset clk_uart_sel in spregOffset */
1827         if (baudRate > 115200) {
1828 #ifdef HW_flow_control
1829                 /* NOTE: need to see the pther register to modify */
1830                 /* setting h/w flow control bit to 1 */
1831                 Data = 0x2b;
1832                 mos7840_port->shadowMCR = Data;
1833                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1834                                                                         Data);
1835                 if (status < 0) {
1836                         dbg("Writing spreg failed in set_serial_baud");
1837                         return -1;
1838                 }
1839 #endif
1840
1841         } else {
1842 #ifdef HW_flow_control
1843                 / *setting h/w flow control bit to 0 */
1844                 Data = 0xb;
1845                 mos7840_port->shadowMCR = Data;
1846                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1847                                                                         Data);
1848                 if (status < 0) {
1849                         dbg("Writing spreg failed in set_serial_baud");
1850                         return -1;
1851                 }
1852 #endif
1853
1854         }
1855
1856         if (1) {                /* baudRate <= 115200) */
1857                 clk_sel_val = 0x0;
1858                 Data = 0x0;
1859                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1860                                                    &clk_sel_val);
1861                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1862                                                                  &Data);
1863                 if (status < 0) {
1864                         dbg("reading spreg failed in set_serial_baud");
1865                         return -1;
1866                 }
1867                 Data = (Data & 0x8f) | clk_sel_val;
1868                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1869                                                                 Data);
1870                 if (status < 0) {
1871                         dbg("Writing spreg failed in set_serial_baud");
1872                         return -1;
1873                 }
1874                 /* Calculate the Divisor */
1875
1876                 if (status) {
1877                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1878                         return status;
1879                 }
1880                 /* Enable access to divisor latch */
1881                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1882                 mos7840_port->shadowLCR = Data;
1883                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1884
1885                 /* Write the divisor */
1886                 Data = (unsigned char)(divisor & 0xff);
1887                 dbg("set_serial_baud Value to write DLL is %x", Data);
1888                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1889
1890                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1891                 dbg("set_serial_baud Value to write DLM is %x", Data);
1892                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1893
1894                 /* Disable access to divisor latch */
1895                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1896                 mos7840_port->shadowLCR = Data;
1897                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1898
1899         }
1900         return status;
1901 }
1902
1903 /*****************************************************************************
1904  * mos7840_change_port_settings
1905  *      This routine is called to set the UART on the device to match
1906  *      the specified new settings.
1907  *****************************************************************************/
1908
1909 static void mos7840_change_port_settings(struct tty_struct *tty,
1910         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1911 {
1912         int baud;
1913         unsigned cflag;
1914         unsigned iflag;
1915         __u8 lData;
1916         __u8 lParity;
1917         __u8 lStop;
1918         int status;
1919         __u16 Data;
1920         struct usb_serial_port *port;
1921         struct usb_serial *serial;
1922
1923         if (mos7840_port == NULL)
1924                 return;
1925
1926         port = (struct usb_serial_port *)mos7840_port->port;
1927
1928         if (mos7840_port_paranoia_check(port, __func__)) {
1929                 dbg("%s", "Invalid port");
1930                 return;
1931         }
1932
1933         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1934                 dbg("%s", "Invalid Serial");
1935                 return;
1936         }
1937
1938         serial = port->serial;
1939
1940         dbg("%s - port %d", __func__, mos7840_port->port->number);
1941
1942         if (!mos7840_port->open) {
1943                 dbg("%s - port not opened", __func__);
1944                 return;
1945         }
1946
1947         dbg("%s", "Entering ..........");
1948
1949         lData = LCR_BITS_8;
1950         lStop = LCR_STOP_1;
1951         lParity = LCR_PAR_NONE;
1952
1953         cflag = tty->termios->c_cflag;
1954         iflag = tty->termios->c_iflag;
1955
1956         /* Change the number of bits */
1957         if (cflag & CSIZE) {
1958                 switch (cflag & CSIZE) {
1959                 case CS5:
1960                         lData = LCR_BITS_5;
1961                         break;
1962
1963                 case CS6:
1964                         lData = LCR_BITS_6;
1965                         break;
1966
1967                 case CS7:
1968                         lData = LCR_BITS_7;
1969                         break;
1970                 default:
1971                 case CS8:
1972                         lData = LCR_BITS_8;
1973                         break;
1974                 }
1975         }
1976         /* Change the Parity bit */
1977         if (cflag & PARENB) {
1978                 if (cflag & PARODD) {
1979                         lParity = LCR_PAR_ODD;
1980                         dbg("%s - parity = odd", __func__);
1981                 } else {
1982                         lParity = LCR_PAR_EVEN;
1983                         dbg("%s - parity = even", __func__);
1984                 }
1985
1986         } else {
1987                 dbg("%s - parity = none", __func__);
1988         }
1989
1990         if (cflag & CMSPAR)
1991                 lParity = lParity | 0x20;
1992
1993         /* Change the Stop bit */
1994         if (cflag & CSTOPB) {
1995                 lStop = LCR_STOP_2;
1996                 dbg("%s - stop bits = 2", __func__);
1997         } else {
1998                 lStop = LCR_STOP_1;
1999                 dbg("%s - stop bits = 1", __func__);
2000         }
2001
2002         /* Update the LCR with the correct value */
2003         mos7840_port->shadowLCR &=
2004             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2005         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2006
2007         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2008             mos7840_port->shadowLCR);
2009         /* Disable Interrupts */
2010         Data = 0x00;
2011         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2012
2013         Data = 0x00;
2014         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2015
2016         Data = 0xcf;
2017         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2018
2019         /* Send the updated LCR value to the mos7840 */
2020         Data = mos7840_port->shadowLCR;
2021
2022         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2023
2024         Data = 0x00b;
2025         mos7840_port->shadowMCR = Data;
2026         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2027         Data = 0x00b;
2028         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2029
2030         /* set up the MCR register and send it to the mos7840 */
2031
2032         mos7840_port->shadowMCR = MCR_MASTER_IE;
2033         if (cflag & CBAUD)
2034                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2035
2036         if (cflag & CRTSCTS)
2037                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2038         else
2039                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2040
2041         Data = mos7840_port->shadowMCR;
2042         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2043
2044         /* Determine divisor based on baud rate */
2045         baud = tty_get_baud_rate(tty);
2046
2047         if (!baud) {
2048                 /* pick a default, any default... */
2049                 dbg("%s", "Picked default baud...");
2050                 baud = 9600;
2051         }
2052
2053         dbg("%s - baud rate = %d", __func__, baud);
2054         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2055
2056         /* Enable Interrupts */
2057         Data = 0x0c;
2058         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2059
2060         if (mos7840_port->read_urb_busy == false) {
2061                 mos7840_port->read_urb->dev = serial->dev;
2062                 mos7840_port->read_urb_busy = true;
2063                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2064                 if (status) {
2065                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2066                             status);
2067                         mos7840_port->read_urb_busy = false;
2068                 }
2069         }
2070         wake_up(&mos7840_port->delta_msr_wait);
2071         mos7840_port->delta_msr_cond = 1;
2072         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2073             mos7840_port->shadowLCR);
2074 }
2075
2076 /*****************************************************************************
2077  * mos7840_set_termios
2078  *      this function is called by the tty driver when it wants to change
2079  *      the termios structure
2080  *****************************************************************************/
2081
2082 static void mos7840_set_termios(struct tty_struct *tty,
2083                                 struct usb_serial_port *port,
2084                                 struct ktermios *old_termios)
2085 {
2086         int status;
2087         unsigned int cflag;
2088         struct usb_serial *serial;
2089         struct moschip_port *mos7840_port;
2090         dbg("mos7840_set_termios: START");
2091         if (mos7840_port_paranoia_check(port, __func__)) {
2092                 dbg("%s", "Invalid port");
2093                 return;
2094         }
2095
2096         serial = port->serial;
2097
2098         if (mos7840_serial_paranoia_check(serial, __func__)) {
2099                 dbg("%s", "Invalid Serial");
2100                 return;
2101         }
2102
2103         mos7840_port = mos7840_get_port_private(port);
2104
2105         if (mos7840_port == NULL)
2106                 return;
2107
2108         if (!mos7840_port->open) {
2109                 dbg("%s - port not opened", __func__);
2110                 return;
2111         }
2112
2113         dbg("%s", "setting termios - ");
2114
2115         cflag = tty->termios->c_cflag;
2116
2117         dbg("%s - clfag %08x iflag %08x", __func__,
2118             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2119         dbg("%s - old clfag %08x old iflag %08x", __func__,
2120             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2121         dbg("%s - port %d", __func__, port->number);
2122
2123         /* change the port settings to the new ones specified */
2124
2125         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2126
2127         if (!mos7840_port->read_urb) {
2128                 dbg("%s", "URB KILLED !!!!!");
2129                 return;
2130         }
2131
2132         if (mos7840_port->read_urb_busy == false) {
2133                 mos7840_port->read_urb->dev = serial->dev;
2134                 mos7840_port->read_urb_busy = true;
2135                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2136                 if (status) {
2137                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2138                             status);
2139                         mos7840_port->read_urb_busy = false;
2140                 }
2141         }
2142 }
2143
2144 /*****************************************************************************
2145  * mos7840_get_lsr_info - get line status register info
2146  *
2147  * Purpose: Let user call ioctl() to get info when the UART physically
2148  *          is emptied.  On bus types like RS485, the transmitter must
2149  *          release the bus after transmitting. This must be done when
2150  *          the transmit shift register is empty, not be done when the
2151  *          transmit holding register is empty.  This functionality
2152  *          allows an RS485 driver to be written in user space.
2153  *****************************************************************************/
2154
2155 static int mos7840_get_lsr_info(struct tty_struct *tty,
2156                                 unsigned int __user *value)
2157 {
2158         int count;
2159         unsigned int result = 0;
2160
2161         count = mos7840_chars_in_buffer(tty);
2162         if (count == 0) {
2163                 dbg("%s -- Empty", __func__);
2164                 result = TIOCSER_TEMT;
2165         }
2166
2167         if (copy_to_user(value, &result, sizeof(int)))
2168                 return -EFAULT;
2169         return 0;
2170 }
2171
2172 /*****************************************************************************
2173  * mos7840_get_serial_info
2174  *      function to get information about serial port
2175  *****************************************************************************/
2176
2177 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2178                                    struct serial_struct __user *retinfo)
2179 {
2180         struct serial_struct tmp;
2181
2182         if (mos7840_port == NULL)
2183                 return -1;
2184
2185         if (!retinfo)
2186                 return -EFAULT;
2187
2188         memset(&tmp, 0, sizeof(tmp));
2189
2190         tmp.type = PORT_16550A;
2191         tmp.line = mos7840_port->port->serial->minor;
2192         tmp.port = mos7840_port->port->number;
2193         tmp.irq = 0;
2194         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2195         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2196         tmp.baud_base = 9600;
2197         tmp.close_delay = 5 * HZ;
2198         tmp.closing_wait = 30 * HZ;
2199
2200         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2201                 return -EFAULT;
2202         return 0;
2203 }
2204
2205 static int mos7840_get_icount(struct tty_struct *tty,
2206                         struct serial_icounter_struct *icount)
2207 {
2208         struct usb_serial_port *port = tty->driver_data;
2209         struct moschip_port *mos7840_port;
2210         struct async_icount cnow;
2211
2212         mos7840_port = mos7840_get_port_private(port);
2213         cnow = mos7840_port->icount;
2214
2215         smp_rmb();
2216         icount->cts = cnow.cts;
2217         icount->dsr = cnow.dsr;
2218         icount->rng = cnow.rng;
2219         icount->dcd = cnow.dcd;
2220         icount->rx = cnow.rx;
2221         icount->tx = cnow.tx;
2222         icount->frame = cnow.frame;
2223         icount->overrun = cnow.overrun;
2224         icount->parity = cnow.parity;
2225         icount->brk = cnow.brk;
2226         icount->buf_overrun = cnow.buf_overrun;
2227
2228         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2229                 port->number, icount->rx, icount->tx);
2230         return 0;
2231 }
2232
2233 /*****************************************************************************
2234  * SerialIoctl
2235  *      this function handles any ioctl calls to the driver
2236  *****************************************************************************/
2237
2238 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2239                          unsigned int cmd, unsigned long arg)
2240 {
2241         struct usb_serial_port *port = tty->driver_data;
2242         void __user *argp = (void __user *)arg;
2243         struct moschip_port *mos7840_port;
2244
2245         struct async_icount cnow;
2246         struct async_icount cprev;
2247
2248         if (mos7840_port_paranoia_check(port, __func__)) {
2249                 dbg("%s", "Invalid port");
2250                 return -1;
2251         }
2252
2253         mos7840_port = mos7840_get_port_private(port);
2254
2255         if (mos7840_port == NULL)
2256                 return -1;
2257
2258         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2259
2260         switch (cmd) {
2261                 /* return number of bytes available */
2262
2263         case TIOCSERGETLSR:
2264                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2265                 return mos7840_get_lsr_info(tty, argp);
2266                 return 0;
2267
2268         case TIOCGSERIAL:
2269                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2270                 return mos7840_get_serial_info(mos7840_port, argp);
2271
2272         case TIOCSSERIAL:
2273                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2274                 break;
2275
2276         case TIOCMIWAIT:
2277                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2278                 cprev = mos7840_port->icount;
2279                 while (1) {
2280                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2281                         mos7840_port->delta_msr_cond = 0;
2282                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2283                                                  (mos7840_port->
2284                                                   delta_msr_cond == 1));
2285
2286                         /* see if a signal did it */
2287                         if (signal_pending(current))
2288                                 return -ERESTARTSYS;
2289                         cnow = mos7840_port->icount;
2290                         smp_rmb();
2291                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2292                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2293                                 return -EIO;    /* no change => error */
2294                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2295                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2296                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2297                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2298                                 return 0;
2299                         }
2300                         cprev = cnow;
2301                 }
2302                 /* NOTREACHED */
2303                 break;
2304
2305         default:
2306                 break;
2307         }
2308         return -ENOIOCTLCMD;
2309 }
2310
2311 static int mos7840_calc_num_ports(struct usb_serial *serial)
2312 {
2313         int mos7840_num_ports = 0;
2314
2315         dbg("numberofendpoints: cur %d, alt %d",
2316             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2317             (int)serial->interface->altsetting->desc.bNumEndpoints);
2318         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2319                 mos7840_num_ports = serial->num_ports = 2;
2320         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2321                 serial->num_bulk_in = 4;
2322                 serial->num_bulk_out = 4;
2323                 mos7840_num_ports = serial->num_ports = 4;
2324         }
2325         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2326         return mos7840_num_ports;
2327 }
2328
2329 /****************************************************************************
2330  * mos7840_startup
2331  ****************************************************************************/
2332
2333 static int mos7840_startup(struct usb_serial *serial)
2334 {
2335         struct moschip_port *mos7840_port;
2336         struct usb_device *dev;
2337         int i, status;
2338
2339         __u16 Data;
2340         dbg("%s", "mos7840_startup :Entering..........");
2341
2342         if (!serial) {
2343                 dbg("%s", "Invalid Handler");
2344                 return -1;
2345         }
2346
2347         dev = serial->dev;
2348
2349         dbg("%s", "Entering...");
2350         dbg ("mos7840_startup: serial = %p", serial);
2351
2352         /* we set up the pointers to the endpoints in the mos7840_open *
2353          * function, as the structures aren't created yet.             */
2354
2355         /* set up port private structures */
2356         for (i = 0; i < serial->num_ports; ++i) {
2357                 dbg ("mos7840_startup: configuring port %d............", i);
2358                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2359                 if (mos7840_port == NULL) {
2360                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2361                         status = -ENOMEM;
2362                         i--; /* don't follow NULL pointer cleaning up */
2363                         goto error;
2364                 }
2365
2366                 /* Initialize all port interrupt end point to port 0 int
2367                  * endpoint. Our device has only one interrupt end point
2368                  * common to all port */
2369
2370                 mos7840_port->port = serial->port[i];
2371                 mos7840_set_port_private(serial->port[i], mos7840_port);
2372                 spin_lock_init(&mos7840_port->pool_lock);
2373
2374                 /* minor is not initialised until later by
2375                  * usb-serial.c:get_free_serial() and cannot therefore be used
2376                  * to index device instances */
2377                 mos7840_port->port_num = i + 1;
2378                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2379                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2380                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2381                 dbg ("serial->minor = %d", serial->minor);
2382
2383                 if (mos7840_port->port_num == 1) {
2384                         mos7840_port->SpRegOffset = 0x0;
2385                         mos7840_port->ControlRegOffset = 0x1;
2386                         mos7840_port->DcrRegOffset = 0x4;
2387                 } else if ((mos7840_port->port_num == 2)
2388                            && (serial->num_ports == 4)) {
2389                         mos7840_port->SpRegOffset = 0x8;
2390                         mos7840_port->ControlRegOffset = 0x9;
2391                         mos7840_port->DcrRegOffset = 0x16;
2392                 } else if ((mos7840_port->port_num == 2)
2393                            && (serial->num_ports == 2)) {
2394                         mos7840_port->SpRegOffset = 0xa;
2395                         mos7840_port->ControlRegOffset = 0xb;
2396                         mos7840_port->DcrRegOffset = 0x19;
2397                 } else if ((mos7840_port->port_num == 3)
2398                            && (serial->num_ports == 4)) {
2399                         mos7840_port->SpRegOffset = 0xa;
2400                         mos7840_port->ControlRegOffset = 0xb;
2401                         mos7840_port->DcrRegOffset = 0x19;
2402                 } else if ((mos7840_port->port_num == 4)
2403                            && (serial->num_ports == 4)) {
2404                         mos7840_port->SpRegOffset = 0xc;
2405                         mos7840_port->ControlRegOffset = 0xd;
2406                         mos7840_port->DcrRegOffset = 0x1c;
2407                 }
2408                 mos7840_dump_serial_port(mos7840_port);
2409                 mos7840_set_port_private(serial->port[i], mos7840_port);
2410
2411                 /* enable rx_disable bit in control register */
2412                 status = mos7840_get_reg_sync(serial->port[i],
2413                                  mos7840_port->ControlRegOffset, &Data);
2414                 if (status < 0) {
2415                         dbg("Reading ControlReg failed status-0x%x", status);
2416                         break;
2417                 } else
2418                         dbg("ControlReg Reading success val is %x, status%d",
2419                             Data, status);
2420                 Data |= 0x08;   /* setting driver done bit */
2421                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2422                                    modem status reg */
2423
2424                 /* Data |= 0x20; //rx_disable bit */
2425                 status = mos7840_set_reg_sync(serial->port[i],
2426                                          mos7840_port->ControlRegOffset, Data);
2427                 if (status < 0) {
2428                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2429                         break;
2430                 } else
2431                         dbg("ControlReg Writing success(rx_disable) status%d",
2432                             status);
2433
2434                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2435                    and 0x24 in DCR3 */
2436                 Data = 0x01;
2437                 status = mos7840_set_reg_sync(serial->port[i],
2438                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2439                 if (status < 0) {
2440                         dbg("Writing DCR0 failed status-0x%x", status);
2441                         break;
2442                 } else
2443                         dbg("DCR0 Writing success status%d", status);
2444
2445                 Data = 0x05;
2446                 status = mos7840_set_reg_sync(serial->port[i],
2447                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2448                 if (status < 0) {
2449                         dbg("Writing DCR1 failed status-0x%x", status);
2450                         break;
2451                 } else
2452                         dbg("DCR1 Writing success status%d", status);
2453
2454                 Data = 0x24;
2455                 status = mos7840_set_reg_sync(serial->port[i],
2456                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2457                 if (status < 0) {
2458                         dbg("Writing DCR2 failed status-0x%x", status);
2459                         break;
2460                 } else
2461                         dbg("DCR2 Writing success status%d", status);
2462
2463                 /* write values in clkstart0x0 and clkmulti 0x20 */
2464                 Data = 0x0;
2465                 status = mos7840_set_reg_sync(serial->port[i],
2466                                          CLK_START_VALUE_REGISTER, Data);
2467                 if (status < 0) {
2468                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2469                         break;
2470                 } else
2471                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2472
2473                 Data = 0x20;
2474                 status = mos7840_set_reg_sync(serial->port[i],
2475                                         CLK_MULTI_REGISTER, Data);
2476                 if (status < 0) {
2477                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2478                             status);
2479                         goto error;
2480                 } else
2481                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2482                             status);
2483
2484                 /* write value 0x0 to scratchpad register */
2485                 Data = 0x00;
2486                 status = mos7840_set_uart_reg(serial->port[i],
2487                                                 SCRATCH_PAD_REGISTER, Data);
2488                 if (status < 0) {
2489                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2490                             status);
2491                         break;
2492                 } else
2493                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2494                             status);
2495
2496                 /* Zero Length flag register */
2497                 if ((mos7840_port->port_num != 1)
2498                     && (serial->num_ports == 2)) {
2499
2500                         Data = 0xff;
2501                         status = mos7840_set_reg_sync(serial->port[i],
2502                                       (__u16) (ZLP_REG1 +
2503                                       ((__u16)mos7840_port->port_num)), Data);
2504                         dbg("ZLIP offset %x",
2505                             (__u16) (ZLP_REG1 +
2506                                         ((__u16) mos7840_port->port_num)));
2507                         if (status < 0) {
2508                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2509                                     i + 2, status);
2510                                 break;
2511                         } else
2512                                 dbg("ZLP_REG%d Writing success status%d",
2513                                     i + 2, status);
2514                 } else {
2515                         Data = 0xff;
2516                         status = mos7840_set_reg_sync(serial->port[i],
2517                               (__u16) (ZLP_REG1 +
2518                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2519                         dbg("ZLIP offset %x",
2520                             (__u16) (ZLP_REG1 +
2521                                      ((__u16) mos7840_port->port_num) - 0x1));
2522                         if (status < 0) {
2523                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2524                                     i + 1, status);
2525                                 break;
2526                         } else
2527                                 dbg("ZLP_REG%d Writing success status%d",
2528                                     i + 1, status);
2529
2530                 }
2531                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2532                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2533                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2534                                                                 GFP_KERNEL);
2535                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2536                                                         !mos7840_port->dr) {
2537                         status = -ENOMEM;
2538                         goto error;
2539                 }
2540         }
2541         dbg ("mos7840_startup: all ports configured...........");
2542
2543         /* Zero Length flag enable */
2544         Data = 0x0f;
2545         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2546         if (status < 0) {
2547                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2548                 goto error;
2549         } else
2550                 dbg("ZLP_REG5 Writing success status%d", status);
2551
2552         /* setting configuration feature to one */
2553         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2554                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2555         return 0;
2556 error:
2557         for (/* nothing */; i >= 0; i--) {
2558                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2559
2560                 kfree(mos7840_port->dr);
2561                 kfree(mos7840_port->ctrl_buf);
2562                 usb_free_urb(mos7840_port->control_urb);
2563                 kfree(mos7840_port);
2564                 serial->port[i] = NULL;
2565         }
2566         return status;
2567 }
2568
2569 /****************************************************************************
2570  * mos7840_disconnect
2571  *      This function is called whenever the device is removed from the usb bus.
2572  ****************************************************************************/
2573
2574 static void mos7840_disconnect(struct usb_serial *serial)
2575 {
2576         int i;
2577         unsigned long flags;
2578         struct moschip_port *mos7840_port;
2579         dbg("%s", " disconnect :entering..........");
2580
2581         if (!serial) {
2582                 dbg("%s", "Invalid Handler");
2583                 return;
2584         }
2585
2586         /* check for the ports to be closed,close the ports and disconnect */
2587
2588         /* free private structure allocated for serial port  *
2589          * stop reads and writes on all ports                */
2590
2591         for (i = 0; i < serial->num_ports; ++i) {
2592                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2593                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2594                 if (mos7840_port) {
2595                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2596                         mos7840_port->zombie = 1;
2597                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2598                         usb_kill_urb(mos7840_port->control_urb);
2599                 }
2600         }
2601
2602         dbg("%s", "Thank u :: ");
2603
2604 }
2605
2606 /****************************************************************************
2607  * mos7840_release
2608  *      This function is called when the usb_serial structure is freed.
2609  ****************************************************************************/
2610
2611 static void mos7840_release(struct usb_serial *serial)
2612 {
2613         int i;
2614         struct moschip_port *mos7840_port;
2615         dbg("%s", " release :entering..........");
2616
2617         if (!serial) {
2618                 dbg("%s", "Invalid Handler");
2619                 return;
2620         }
2621
2622         /* check for the ports to be closed,close the ports and disconnect */
2623
2624         /* free private structure allocated for serial port  *
2625          * stop reads and writes on all ports                */
2626
2627         for (i = 0; i < serial->num_ports; ++i) {
2628                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2629                 dbg("mos7840_port %d = %p", i, mos7840_port);
2630                 if (mos7840_port) {
2631                         kfree(mos7840_port->ctrl_buf);
2632                         kfree(mos7840_port->dr);
2633                         kfree(mos7840_port);
2634                 }
2635         }
2636
2637         dbg("%s", "Thank u :: ");
2638
2639 }
2640
2641 static struct usb_driver io_driver = {
2642         .name = "mos7840",
2643         .probe = usb_serial_probe,
2644         .disconnect = usb_serial_disconnect,
2645         .id_table = moschip_id_table_combined,
2646         .no_dynamic_id = 1,
2647 };
2648
2649 static struct usb_serial_driver moschip7840_4port_device = {
2650         .driver = {
2651                    .owner = THIS_MODULE,
2652                    .name = "mos7840",
2653                    },
2654         .description = DRIVER_DESC,
2655         .usb_driver = &io_driver,
2656         .id_table = moschip_port_id_table,
2657         .num_ports = 4,
2658         .open = mos7840_open,
2659         .close = mos7840_close,
2660         .write = mos7840_write,
2661         .write_room = mos7840_write_room,
2662         .chars_in_buffer = mos7840_chars_in_buffer,
2663         .throttle = mos7840_throttle,
2664         .unthrottle = mos7840_unthrottle,
2665         .calc_num_ports = mos7840_calc_num_ports,
2666 #ifdef MCSSerialProbe
2667         .probe = mos7840_serial_probe,
2668 #endif
2669         .ioctl = mos7840_ioctl,
2670         .set_termios = mos7840_set_termios,
2671         .break_ctl = mos7840_break,
2672         .tiocmget = mos7840_tiocmget,
2673         .tiocmset = mos7840_tiocmset,
2674         .get_icount = mos7840_get_icount,
2675         .attach = mos7840_startup,
2676         .disconnect = mos7840_disconnect,
2677         .release = mos7840_release,
2678         .read_bulk_callback = mos7840_bulk_in_callback,
2679         .read_int_callback = mos7840_interrupt_callback,
2680 };
2681
2682 /****************************************************************************
2683  * moschip7840_init
2684  *      This is called by the module subsystem, or on startup to initialize us
2685  ****************************************************************************/
2686 static int __init moschip7840_init(void)
2687 {
2688         int retval;
2689
2690         dbg("%s", " mos7840_init :entering..........");
2691
2692         /* Register with the usb serial */
2693         retval = usb_serial_register(&moschip7840_4port_device);
2694
2695         if (retval)
2696                 goto failed_port_device_register;
2697
2698         dbg("%s", "Entering...");
2699         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2700                DRIVER_DESC "\n");
2701
2702         /* Register with the usb */
2703         retval = usb_register(&io_driver);
2704         if (retval == 0) {
2705                 dbg("%s", "Leaving...");
2706                 return 0;
2707         }
2708         usb_serial_deregister(&moschip7840_4port_device);
2709 failed_port_device_register:
2710         return retval;
2711 }
2712
2713 /****************************************************************************
2714  * moschip7840_exit
2715  *      Called when the driver is about to be unloaded.
2716  ****************************************************************************/
2717 static void __exit moschip7840_exit(void)
2718 {
2719
2720         dbg("%s", " mos7840_exit :entering..........");
2721
2722         usb_deregister(&io_driver);
2723
2724         usb_serial_deregister(&moschip7840_4port_device);
2725
2726         dbg("%s", "Entering...");
2727 }
2728
2729 module_init(moschip7840_init);
2730 module_exit(moschip7840_exit);
2731
2732 /* Module information */
2733 MODULE_DESCRIPTION(DRIVER_DESC);
2734 MODULE_LICENSE("GPL");
2735
2736 module_param(debug, bool, S_IRUGO | S_IWUSR);
2737 MODULE_PARM_DESC(debug, "Debug enabled or not");