drivers/usb/serial/pl2303.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Prolific PL2303 USB to serial adaptor driver
   4  *
   5  * Copyright (C) 2001-2007 Greg Kroah-Hartman ([email protected])
   6  * Copyright (C) 2003 IBM Corp.
   7  *
   8  * Original driver for 2.2.x by anonymous
   9  *
  10  * See Documentation/usb/usb-serial.rst for more information on using this
  11  * driver
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_driver.h>
  19 #include <linux/tty_flip.h>
  20 #include <linux/serial.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/serial.h>
  27 #include <asm/unaligned.h>
  28 #include "pl2303.h"
  29
  30
  31 #define PL2303_QUIRK_UART_STATE_IDX0            BIT(0)
  32 #define PL2303_QUIRK_LEGACY                     BIT(1)
  33 #define PL2303_QUIRK_ENDPOINT_HACK              BIT(2)
  34
  35 static const struct usb_device_id id_table[] = {
  36         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
  37                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  38         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  39         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  40         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  41         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
  42         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  43         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  44         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  45         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  48         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
  49         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
  50         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
  51         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
  52         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
  53         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
  55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
  56         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  57         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  58         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
  59                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  60         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
  61                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  62         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
  63                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  64         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
  65         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  66         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  67         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  68         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  69         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  70         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  71         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  72         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  73         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  74         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  75         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  76         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  77         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  78                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  79         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  80                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  81         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  82                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  83         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
  84                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  85         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  86         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  87         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  88         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  89         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  90         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  91         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  92         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  93         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  94         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
  95                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  96         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  97         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  98         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  99         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
 100         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
 101         { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
 102         { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
 103         { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
 104         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
 105         { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
 106         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 107         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 108         { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
 109         { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
 110         { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
 111         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 112         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 113         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 114         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 115         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 116         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 117         { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
 118         { }                                     /* Terminating entry */
 119 };
 120
 121 MODULE_DEVICE_TABLE(usb, id_table);
 122
 123 #define SET_LINE_REQUEST_TYPE           0x21
 124 #define SET_LINE_REQUEST                0x20
 125
 126 #define SET_CONTROL_REQUEST_TYPE        0x21
 127 #define SET_CONTROL_REQUEST             0x22
 128 #define CONTROL_DTR                     0x01
 129 #define CONTROL_RTS                     0x02
 130
 131 #define BREAK_REQUEST_TYPE              0x21
 132 #define BREAK_REQUEST                   0x23
 133 #define BREAK_ON                        0xffff
 134 #define BREAK_OFF                       0x0000
 135
 136 #define GET_LINE_REQUEST_TYPE           0xa1
 137 #define GET_LINE_REQUEST                0x21
 138
 139 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 140 #define VENDOR_WRITE_REQUEST            0x01
 141 #define VENDOR_WRITE_NREQUEST           0x80
 142
 143 #define VENDOR_READ_REQUEST_TYPE        0xc0
 144 #define VENDOR_READ_REQUEST             0x01
 145 #define VENDOR_READ_NREQUEST            0x81
 146
 147 #define UART_STATE_INDEX                8
 148 #define UART_STATE_MSR_MASK             0x8b
 149 #define UART_STATE_TRANSIENT_MASK       0x74
 150 #define UART_DCD                        0x01
 151 #define UART_DSR                        0x02
 152 #define UART_BREAK_ERROR                0x04
 153 #define UART_RING                       0x08
 154 #define UART_FRAME_ERROR                0x10
 155 #define UART_PARITY_ERROR               0x20
 156 #define UART_OVERRUN_ERROR              0x40
 157 #define UART_CTS                        0x80
 158
 159 #define PL2303_FLOWCTRL_MASK            0xf0
 160
 161 #define PL2303_READ_TYPE_HX_STATUS      0x8080
 162
 163 #define PL2303_HXN_RESET_REG            0x07
 164 #define PL2303_HXN_RESET_UPSTREAM_PIPE  0x02
 165 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE        0x01
 166
 167 #define PL2303_HXN_FLOWCTRL_REG         0x0a
 168 #define PL2303_HXN_FLOWCTRL_MASK        0x1c
 169 #define PL2303_HXN_FLOWCTRL_NONE        0x1c
 170 #define PL2303_HXN_FLOWCTRL_RTS_CTS     0x18
 171 #define PL2303_HXN_FLOWCTRL_XON_XOFF    0x0c
 172
 173 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
 174
 175 enum pl2303_type {
 176         TYPE_H,
 177         TYPE_HX,
 178         TYPE_TA,
 179         TYPE_TB,
 180         TYPE_HXD,
 181         TYPE_HXN,
 182         TYPE_COUNT
 183 };
 184
 185 struct pl2303_type_data {
 186         const char *name;
 187         speed_t max_baud_rate;
 188         unsigned long quirks;
 189         unsigned int no_autoxonxoff:1;
 190         unsigned int no_divisors:1;
 191         unsigned int alt_divisors:1;
 192 };
 193
 194 struct pl2303_serial_private {
 195         const struct pl2303_type_data *type;
 196         unsigned long quirks;
 197 };
 198
 199 struct pl2303_private {
 200         spinlock_t lock;
 201         u8 line_control;
 202         u8 line_status;
 203
 204         u8 line_settings[7];
 205 };
 206
 207 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 208         [TYPE_H] = {
 209                 .name                   = "H",
 210                 .max_baud_rate          = 1228800,
 211                 .quirks                 = PL2303_QUIRK_LEGACY,
 212                 .no_autoxonxoff         = true,
 213         },
 214         [TYPE_HX] = {
 215                 .name                   = "HX",
 216                 .max_baud_rate          = 6000000,
 217         },
 218         [TYPE_TA] = {
 219                 .name                   = "TA",
 220                 .max_baud_rate          = 6000000,
 221                 .alt_divisors           = true,
 222         },
 223         [TYPE_TB] = {
 224                 .name                   = "TB",
 225                 .max_baud_rate          = 12000000,
 226                 .alt_divisors           = true,
 227         },
 228         [TYPE_HXD] = {
 229                 .name                   = "HXD",
 230                 .max_baud_rate          = 12000000,
 231         },
 232         [TYPE_HXN] = {
 233                 .name                   = "G",
 234                 .max_baud_rate          = 12000000,
 235                 .no_divisors            = true,
 236         },
 237 };
 238
 239 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 240                                                         unsigned char buf[1])
 241 {
 242         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 243         struct device *dev = &serial->interface->dev;
 244         u8 request;
 245         int res;
 246
 247         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 248                 request = VENDOR_READ_NREQUEST;
 249         else
 250                 request = VENDOR_READ_REQUEST;
 251
 252         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 253                         request, VENDOR_READ_REQUEST_TYPE,
 254                         value, 0, buf, 1, 100);
 255         if (res != 1) {
 256                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 257                                                                 value, res);
 258                 if (res >= 0)
 259                         res = -EIO;
 260
 261                 return res;
 262         }
 263
 264         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 265
 266         return 0;
 267 }
 268
 269 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 270 {
 271         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 272         struct device *dev = &serial->interface->dev;
 273         u8 request;
 274         int res;
 275
 276         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 277
 278         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 279                 request = VENDOR_WRITE_NREQUEST;
 280         else
 281                 request = VENDOR_WRITE_REQUEST;
 282
 283         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 284                         request, VENDOR_WRITE_REQUEST_TYPE,
 285                         value, index, NULL, 0, 100);
 286         if (res) {
 287                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 288                                                                 value, res);
 289                 return res;
 290         }
 291
 292         return 0;
 293 }
 294
 295 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 296 {
 297         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 298         int ret = 0;
 299         u8 *buf;
 300
 301         buf = kmalloc(1, GFP_KERNEL);
 302         if (!buf)
 303                 return -ENOMEM;
 304
 305         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 306                 ret = pl2303_vendor_read(serial, reg, buf);
 307         else
 308                 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
 309
 310         if (ret)
 311                 goto out_free;
 312
 313         *buf &= ~mask;
 314         *buf |= val & mask;
 315
 316         ret = pl2303_vendor_write(serial, reg, *buf);
 317 out_free:
 318         kfree(buf);
 319
 320         return ret;
 321 }
 322
 323 static int pl2303_probe(struct usb_serial *serial,
 324                                         const struct usb_device_id *id)
 325 {
 326         usb_set_serial_data(serial, (void *)id->driver_info);
 327
 328         return 0;
 329 }
 330
 331 /*
 332  * Use interrupt endpoint from first interface if available.
 333  *
 334  * This is needed due to the looney way its endpoints are set up.
 335  */
 336 static int pl2303_endpoint_hack(struct usb_serial *serial,
 337                                         struct usb_serial_endpoints *epds)
 338 {
 339         struct usb_interface *interface = serial->interface;
 340         struct usb_device *dev = serial->dev;
 341         struct device *ddev = &interface->dev;
 342         struct usb_host_interface *iface_desc;
 343         struct usb_endpoint_descriptor *endpoint;
 344         unsigned int i;
 345
 346         if (interface == dev->actconfig->interface[0])
 347                 return 0;
 348
 349         /* check out the endpoints of the other interface */
 350         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 351
 352         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 353                 endpoint = &iface_desc->endpoint[i].desc;
 354
 355                 if (!usb_endpoint_is_int_in(endpoint))
 356                         continue;
 357
 358                 dev_dbg(ddev, "found interrupt in on separate interface\n");
 359                 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 360                         epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int pl2303_calc_num_ports(struct usb_serial *serial,
 367                                         struct usb_serial_endpoints *epds)
 368 {
 369         unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 370         struct device *dev = &serial->interface->dev;
 371         int ret;
 372
 373         if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 374                 ret = pl2303_endpoint_hack(serial, epds);
 375                 if (ret)
 376                         return ret;
 377         }
 378
 379         if (epds->num_interrupt_in < 1) {
 380                 dev_err(dev, "required interrupt-in endpoint missing\n");
 381                 return -ENODEV;
 382         }
 383
 384         return 1;
 385 }
 386
 387 static bool pl2303_supports_hx_status(struct usb_serial *serial)
 388 {
 389         int ret;
 390         u8 buf;
 391
 392         ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
 393                         VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
 394                         0, &buf, 1, 100, GFP_KERNEL);
 395
 396         return ret == 0;
 397 }
 398
 399 static int pl2303_detect_type(struct usb_serial *serial)
 400 {
 401         struct usb_device_descriptor *desc = &serial->dev->descriptor;
 402         u16 bcdDevice, bcdUSB;
 403
 404         /*
 405          * Legacy PL2303H, variants 0 and 1 (difference unknown).
 406          */
 407         if (desc->bDeviceClass == 0x02)
 408                 return TYPE_H;          /* variant 0 */
 409
 410         if (desc->bMaxPacketSize0 != 0x40) {
 411                 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
 412                         return TYPE_H;  /* variant 1 */
 413
 414                 return TYPE_H;          /* variant 0 */
 415         }
 416
 417         bcdDevice = le16_to_cpu(desc->bcdDevice);
 418         bcdUSB = le16_to_cpu(desc->bcdUSB);
 419
 420         switch (bcdDevice) {
 421         case 0x100:
 422                 /*
 423                  * Assume it's an HXN-type if the device doesn't support the old read
 424                  * request value.
 425                  */
 426                 if (bcdUSB == 0x200 && !pl2303_supports_hx_status(serial))
 427                         return TYPE_HXN;
 428                 break;
 429         case 0x300:
 430                 if (bcdUSB == 0x200)
 431                         return TYPE_TA;
 432
 433                 return TYPE_HX;
 434         case 0x400:
 435                 return TYPE_HXD;
 436         case 0x500:
 437                 return TYPE_TB;
 438         }
 439
 440         dev_err(&serial->interface->dev,
 441                         "unknown device type, please report to [email protected]\n");
 442         return -ENODEV;
 443 }
 444
 445 static int pl2303_startup(struct usb_serial *serial)
 446 {
 447         struct pl2303_serial_private *spriv;
 448         enum pl2303_type type;
 449         unsigned char *buf;
 450         int ret;
 451
 452         ret = pl2303_detect_type(serial);
 453         if (ret < 0)
 454                 return ret;
 455
 456         type = ret;
 457         dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
 458
 459         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 460         if (!spriv)
 461                 return -ENOMEM;
 462
 463         spriv->type = &pl2303_type_data[type];
 464         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 465         spriv->quirks |= spriv->type->quirks;
 466
 467         usb_set_serial_data(serial, spriv);
 468
 469         if (type != TYPE_HXN) {
 470                 buf = kmalloc(1, GFP_KERNEL);
 471                 if (!buf) {
 472                         kfree(spriv);
 473                         return -ENOMEM;
 474                 }
 475
 476                 pl2303_vendor_read(serial, 0x8484, buf);
 477                 pl2303_vendor_write(serial, 0x0404, 0);
 478                 pl2303_vendor_read(serial, 0x8484, buf);
 479                 pl2303_vendor_read(serial, 0x8383, buf);
 480                 pl2303_vendor_read(serial, 0x8484, buf);
 481                 pl2303_vendor_write(serial, 0x0404, 1);
 482                 pl2303_vendor_read(serial, 0x8484, buf);
 483                 pl2303_vendor_read(serial, 0x8383, buf);
 484                 pl2303_vendor_write(serial, 0, 1);
 485                 pl2303_vendor_write(serial, 1, 0);
 486                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 487                         pl2303_vendor_write(serial, 2, 0x24);
 488                 else
 489                         pl2303_vendor_write(serial, 2, 0x44);
 490
 491                 kfree(buf);
 492         }
 493
 494         return 0;
 495 }
 496
 497 static void pl2303_release(struct usb_serial *serial)
 498 {
 499         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 500
 501         kfree(spriv);
 502 }
 503
 504 static int pl2303_port_probe(struct usb_serial_port *port)
 505 {
 506         struct pl2303_private *priv;
 507
 508         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 509         if (!priv)
 510                 return -ENOMEM;
 511
 512         spin_lock_init(&priv->lock);
 513
 514         usb_set_serial_port_data(port, priv);
 515
 516         port->port.drain_delay = 256;
 517
 518         return 0;
 519 }
 520
 521 static void pl2303_port_remove(struct usb_serial_port *port)
 522 {
 523         struct pl2303_private *priv = usb_get_serial_port_data(port);
 524
 525         kfree(priv);
 526 }
 527
 528 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 529 {
 530         struct usb_device *dev = port->serial->dev;
 531         int retval;
 532
 533         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 534
 535         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 536                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 537                                  value, 0, NULL, 0, 100);
 538         if (retval)
 539                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 540
 541         return retval;
 542 }
 543
 544 /*
 545  * Returns the nearest supported baud rate that can be set directly without
 546  * using divisors.
 547  */
 548 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 549 {
 550         static const speed_t baud_sup[] = {
 551                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 552                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 553                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 554         };
 555
 556         unsigned i;
 557
 558         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 559                 if (baud_sup[i] > baud)
 560                         break;
 561         }
 562
 563         if (i == ARRAY_SIZE(baud_sup))
 564                 baud = baud_sup[i - 1];
 565         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 566                 baud = baud_sup[i - 1];
 567         else
 568                 baud = baud_sup[i];
 569
 570         return baud;
 571 }
 572
 573 /*
 574  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 575  *       use 9600 baud.
 576  */
 577 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 578                                                                 speed_t baud)
 579 {
 580         put_unaligned_le32(baud, buf);
 581
 582         return baud;
 583 }
 584
 585 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 586                                                                 speed_t baud)
 587 {
 588         unsigned int baseline, mantissa, exponent;
 589
 590         /*
 591          * Apparently the formula is:
 592          *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 593          * where
 594          *   mantissa = buf[8:0]
 595          *   exponent = buf[11:9]
 596          */
 597         baseline = 12000000 * 32;
 598         mantissa = baseline / baud;
 599         if (mantissa == 0)
 600                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 601         exponent = 0;
 602         while (mantissa >= 512) {
 603                 if (exponent < 7) {
 604                         mantissa >>= 2; /* divide by 4 */
 605                         exponent++;
 606                 } else {
 607                         /* Exponent is maxed. Trim mantissa and leave. */
 608                         mantissa = 511;
 609                         break;
 610                 }
 611         }
 612
 613         buf[3] = 0x80;
 614         buf[2] = 0;
 615         buf[1] = exponent << 1 | mantissa >> 8;
 616         buf[0] = mantissa & 0xff;
 617
 618         /* Calculate and return the exact baud rate. */
 619         baud = (baseline / mantissa) >> (exponent << 1);
 620
 621         return baud;
 622 }
 623
 624 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
 625                                                                 speed_t baud)
 626 {
 627         unsigned int baseline, mantissa, exponent;
 628
 629         /*
 630          * Apparently, for the TA version the formula is:
 631          *   baudrate = 12M * 32 / (mantissa * 2^exponent)
 632          * where
 633          *   mantissa = buf[10:0]
 634          *   exponent = buf[15:13 16]
 635          */
 636         baseline = 12000000 * 32;
 637         mantissa = baseline / baud;
 638         if (mantissa == 0)
 639                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 640         exponent = 0;
 641         while (mantissa >= 2048) {
 642                 if (exponent < 15) {
 643                         mantissa >>= 1; /* divide by 2 */
 644                         exponent++;
 645                 } else {
 646                         /* Exponent is maxed. Trim mantissa and leave. */
 647                         mantissa = 2047;
 648                         break;
 649                 }
 650         }
 651
 652         buf[3] = 0x80;
 653         buf[2] = exponent & 0x01;
 654         buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
 655         buf[0] = mantissa & 0xff;
 656
 657         /* Calculate and return the exact baud rate. */
 658         baud = (baseline / mantissa) >> exponent;
 659
 660         return baud;
 661 }
 662
 663 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 664                                         struct usb_serial_port *port,
 665                                         u8 buf[4])
 666 {
 667         struct usb_serial *serial = port->serial;
 668         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 669         speed_t baud_sup;
 670         speed_t baud;
 671
 672         baud = tty_get_baud_rate(tty);
 673         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 674         if (!baud)
 675                 return;
 676
 677         if (spriv->type->max_baud_rate)
 678                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 679         /*
 680          * Use direct method for supported baud rates, otherwise use divisors.
 681          * Newer chip types do not support divisor encoding.
 682          */
 683         if (spriv->type->no_divisors)
 684                 baud_sup = baud;
 685         else
 686                 baud_sup = pl2303_get_supported_baud_rate(baud);
 687
 688         if (baud == baud_sup)
 689                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 690         else if (spriv->type->alt_divisors)
 691                 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
 692         else
 693                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 694
 695         /* Save resulting baud rate */
 696         tty_encode_baud_rate(tty, baud, baud);
 697         dev_dbg(&port->dev, "baud set = %u\n", baud);
 698 }
 699
 700 static int pl2303_get_line_request(struct usb_serial_port *port,
 701                                                         unsigned char buf[7])
 702 {
 703         struct usb_device *udev = port->serial->dev;
 704         int ret;
 705
 706         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 707                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 708                                 0, 0, buf, 7, 100);
 709         if (ret != 7) {
 710                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 711
 712                 if (ret >= 0)
 713                         ret = -EIO;
 714
 715                 return ret;
 716         }
 717
 718         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 719
 720         return 0;
 721 }
 722
 723 static int pl2303_set_line_request(struct usb_serial_port *port,
 724                                                         unsigned char buf[7])
 725 {
 726         struct usb_device *udev = port->serial->dev;
 727         int ret;
 728
 729         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 730                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 731                                 0, 0, buf, 7, 100);
 732         if (ret < 0) {
 733                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 734                 return ret;
 735         }
 736
 737         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 738
 739         return 0;
 740 }
 741
 742 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
 743 {
 744         bool ixon_change;
 745
 746         ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
 747                         a->c_cc[VSTART] != b->c_cc[VSTART] ||
 748                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
 749
 750         return tty_termios_hw_change(a, b) || ixon_change;
 751 }
 752
 753 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
 754 {
 755         if (!I_IXON(tty) || I_IXANY(tty))
 756                 return false;
 757
 758         if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
 759                 return false;
 760
 761         if (type->no_autoxonxoff)
 762                 return false;
 763
 764         return true;
 765 }
 766
 767 static void pl2303_set_termios(struct tty_struct *tty,
 768                 struct usb_serial_port *port, struct ktermios *old_termios)
 769 {
 770         struct usb_serial *serial = port->serial;
 771         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 772         struct pl2303_private *priv = usb_get_serial_port_data(port);
 773         unsigned long flags;
 774         unsigned char *buf;
 775         int ret;
 776         u8 control;
 777
 778         if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
 779                 return;
 780
 781         buf = kzalloc(7, GFP_KERNEL);
 782         if (!buf) {
 783                 /* Report back no change occurred */
 784                 if (old_termios)
 785                         tty->termios = *old_termios;
 786                 return;
 787         }
 788
 789         pl2303_get_line_request(port, buf);
 790
 791         switch (C_CSIZE(tty)) {
 792         case CS5:
 793                 buf[6] = 5;
 794                 break;
 795         case CS6:
 796                 buf[6] = 6;
 797                 break;
 798         case CS7:
 799                 buf[6] = 7;
 800                 break;
 801         default:
 802         case CS8:
 803                 buf[6] = 8;
 804         }
 805         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 806
 807         /* For reference buf[0]:buf[3] baud rate value */
 808         pl2303_encode_baud_rate(tty, port, &buf[0]);
 809
 810         /* For reference buf[4]=0 is 1 stop bits */
 811         /* For reference buf[4]=1 is 1.5 stop bits */
 812         /* For reference buf[4]=2 is 2 stop bits */
 813         if (C_CSTOPB(tty)) {
 814                 /*
 815                  * NOTE: Comply with "real" UARTs / RS232:
 816                  *       use 1.5 instead of 2 stop bits with 5 data bits
 817                  */
 818                 if (C_CSIZE(tty) == CS5) {
 819                         buf[4] = 1;
 820                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 821                 } else {
 822                         buf[4] = 2;
 823                         dev_dbg(&port->dev, "stop bits = 2\n");
 824                 }
 825         } else {
 826                 buf[4] = 0;
 827                 dev_dbg(&port->dev, "stop bits = 1\n");
 828         }
 829
 830         if (C_PARENB(tty)) {
 831                 /* For reference buf[5]=0 is none parity */
 832                 /* For reference buf[5]=1 is odd parity */
 833                 /* For reference buf[5]=2 is even parity */
 834                 /* For reference buf[5]=3 is mark parity */
 835                 /* For reference buf[5]=4 is space parity */
 836                 if (C_PARODD(tty)) {
 837                         if (C_CMSPAR(tty)) {
 838                                 buf[5] = 3;
 839                                 dev_dbg(&port->dev, "parity = mark\n");
 840                         } else {
 841                                 buf[5] = 1;
 842                                 dev_dbg(&port->dev, "parity = odd\n");
 843                         }
 844                 } else {
 845                         if (C_CMSPAR(tty)) {
 846                                 buf[5] = 4;
 847                                 dev_dbg(&port->dev, "parity = space\n");
 848                         } else {
 849                                 buf[5] = 2;
 850                                 dev_dbg(&port->dev, "parity = even\n");
 851                         }
 852                 }
 853         } else {
 854                 buf[5] = 0;
 855                 dev_dbg(&port->dev, "parity = none\n");
 856         }
 857
 858         /*
 859          * Some PL2303 are known to lose bytes if you change serial settings
 860          * even to the same values as before. Thus we actually need to filter
 861          * in this specific case.
 862          *
 863          * Note that the tty_termios_hw_change check above is not sufficient
 864          * as a previously requested baud rate may differ from the one
 865          * actually used (and stored in old_termios).
 866          *
 867          * NOTE: No additional locking needed for line_settings as it is
 868          *       only used in set_termios, which is serialised against itself.
 869          */
 870         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 871                 ret = pl2303_set_line_request(port, buf);
 872                 if (!ret)
 873                         memcpy(priv->line_settings, buf, 7);
 874         }
 875
 876         /* change control lines if we are switching to or from B0 */
 877         spin_lock_irqsave(&priv->lock, flags);
 878         control = priv->line_control;
 879         if (C_BAUD(tty) == B0)
 880                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 881         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 882                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 883         if (control != priv->line_control) {
 884                 control = priv->line_control;
 885                 spin_unlock_irqrestore(&priv->lock, flags);
 886                 pl2303_set_control_lines(port, control);
 887         } else {
 888                 spin_unlock_irqrestore(&priv->lock, flags);
 889         }
 890
 891         if (C_CRTSCTS(tty)) {
 892                 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 893                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
 894                 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 895                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 896                                         PL2303_HXN_FLOWCTRL_MASK,
 897                                         PL2303_HXN_FLOWCTRL_RTS_CTS);
 898                 } else {
 899                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
 900                 }
 901         } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
 902                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 903                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 904                                         PL2303_HXN_FLOWCTRL_MASK,
 905                                         PL2303_HXN_FLOWCTRL_XON_XOFF);
 906                 } else {
 907                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
 908                 }
 909         } else {
 910                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 911                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 912                                         PL2303_HXN_FLOWCTRL_MASK,
 913                                         PL2303_HXN_FLOWCTRL_NONE);
 914                 } else {
 915                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 916                 }
 917         }
 918
 919         kfree(buf);
 920 }
 921
 922 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 923 {
 924         struct pl2303_private *priv = usb_get_serial_port_data(port);
 925         unsigned long flags;
 926         u8 control;
 927
 928         spin_lock_irqsave(&priv->lock, flags);
 929         if (on)
 930                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 931         else
 932                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 933         control = priv->line_control;
 934         spin_unlock_irqrestore(&priv->lock, flags);
 935
 936         pl2303_set_control_lines(port, control);
 937 }
 938
 939 static void pl2303_close(struct usb_serial_port *port)
 940 {
 941         usb_serial_generic_close(port);
 942         usb_kill_urb(port->interrupt_in_urb);
 943         pl2303_set_break(port, false);
 944 }
 945
 946 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 947 {
 948         struct usb_serial *serial = port->serial;
 949         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 950         int result;
 951
 952         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 953                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 954                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 955         } else {
 956                 /* reset upstream data pipes */
 957                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 958                         pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
 959                                         PL2303_HXN_RESET_UPSTREAM_PIPE |
 960                                         PL2303_HXN_RESET_DOWNSTREAM_PIPE);
 961                 } else {
 962                         pl2303_vendor_write(serial, 8, 0);
 963                         pl2303_vendor_write(serial, 9, 0);
 964                 }
 965         }
 966
 967         /* Setup termios */
 968         if (tty)
 969                 pl2303_set_termios(tty, port, NULL);
 970
 971         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 972         if (result) {
 973                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 974                         result);
 975                 return result;
 976         }
 977
 978         result = usb_serial_generic_open(tty, port);
 979         if (result) {
 980                 usb_kill_urb(port->interrupt_in_urb);
 981                 return result;
 982         }
 983
 984         return 0;
 985 }
 986
 987 static int pl2303_tiocmset(struct tty_struct *tty,
 988                            unsigned int set, unsigned int clear)
 989 {
 990         struct usb_serial_port *port = tty->driver_data;
 991         struct pl2303_private *priv = usb_get_serial_port_data(port);
 992         unsigned long flags;
 993         u8 control;
 994         int ret;
 995
 996         spin_lock_irqsave(&priv->lock, flags);
 997         if (set & TIOCM_RTS)
 998                 priv->line_control |= CONTROL_RTS;
 999         if (set & TIOCM_DTR)
1000                 priv->line_control |= CONTROL_DTR;
1001         if (clear & TIOCM_RTS)
1002                 priv->line_control &= ~CONTROL_RTS;
1003         if (clear & TIOCM_DTR)
1004                 priv->line_control &= ~CONTROL_DTR;
1005         control = priv->line_control;
1006         spin_unlock_irqrestore(&priv->lock, flags);
1007
1008         ret = pl2303_set_control_lines(port, control);
1009         if (ret)
1010                 return usb_translate_errors(ret);
1011
1012         return 0;
1013 }
1014
1015 static int pl2303_tiocmget(struct tty_struct *tty)
1016 {
1017         struct usb_serial_port *port = tty->driver_data;
1018         struct pl2303_private *priv = usb_get_serial_port_data(port);
1019         unsigned long flags;
1020         unsigned int mcr;
1021         unsigned int status;
1022         unsigned int result;
1023
1024         spin_lock_irqsave(&priv->lock, flags);
1025         mcr = priv->line_control;
1026         status = priv->line_status;
1027         spin_unlock_irqrestore(&priv->lock, flags);
1028
1029         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
1030                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
1031                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
1032                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
1033                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
1034                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
1035
1036         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1037
1038         return result;
1039 }
1040
1041 static int pl2303_carrier_raised(struct usb_serial_port *port)
1042 {
1043         struct pl2303_private *priv = usb_get_serial_port_data(port);
1044
1045         if (priv->line_status & UART_DCD)
1046                 return 1;
1047
1048         return 0;
1049 }
1050
1051 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
1052 {
1053         struct usb_serial *serial = port->serial;
1054         u16 state;
1055         int result;
1056
1057         if (enable)
1058                 state = BREAK_ON;
1059         else
1060                 state = BREAK_OFF;
1061
1062         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1063                         state == BREAK_OFF ? "off" : "on");
1064
1065         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1066                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1067                                  0, NULL, 0, 100);
1068         if (result)
1069                 dev_err(&port->dev, "error sending break = %d\n", result);
1070 }
1071
1072 static void pl2303_break_ctl(struct tty_struct *tty, int state)
1073 {
1074         struct usb_serial_port *port = tty->driver_data;
1075
1076         pl2303_set_break(port, state);
1077 }
1078
1079 static void pl2303_update_line_status(struct usb_serial_port *port,
1080                                       unsigned char *data,
1081                                       unsigned int actual_length)
1082 {
1083         struct usb_serial *serial = port->serial;
1084         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1085         struct pl2303_private *priv = usb_get_serial_port_data(port);
1086         struct tty_struct *tty;
1087         unsigned long flags;
1088         unsigned int status_idx = UART_STATE_INDEX;
1089         u8 status;
1090         u8 delta;
1091
1092         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1093                 status_idx = 0;
1094
1095         if (actual_length < status_idx + 1)
1096                 return;
1097
1098         status = data[status_idx];
1099
1100         /* Save off the uart status for others to look at */
1101         spin_lock_irqsave(&priv->lock, flags);
1102         delta = priv->line_status ^ status;
1103         priv->line_status = status;
1104         spin_unlock_irqrestore(&priv->lock, flags);
1105
1106         if (status & UART_BREAK_ERROR)
1107                 usb_serial_handle_break(port);
1108
1109         if (delta & UART_STATE_MSR_MASK) {
1110                 if (delta & UART_CTS)
1111                         port->icount.cts++;
1112                 if (delta & UART_DSR)
1113                         port->icount.dsr++;
1114                 if (delta & UART_RING)
1115                         port->icount.rng++;
1116                 if (delta & UART_DCD) {
1117                         port->icount.dcd++;
1118                         tty = tty_port_tty_get(&port->port);
1119                         if (tty) {
1120                                 usb_serial_handle_dcd_change(port, tty,
1121                                                         status & UART_DCD);
1122                                 tty_kref_put(tty);
1123                         }
1124                 }
1125
1126                 wake_up_interruptible(&port->port.delta_msr_wait);
1127         }
1128 }
1129
1130 static void pl2303_read_int_callback(struct urb *urb)
1131 {
1132         struct usb_serial_port *port =  urb->context;
1133         unsigned char *data = urb->transfer_buffer;
1134         unsigned int actual_length = urb->actual_length;
1135         int status = urb->status;
1136         int retval;
1137
1138         switch (status) {
1139         case 0:
1140                 /* success */
1141                 break;
1142         case -ECONNRESET:
1143         case -ENOENT:
1144         case -ESHUTDOWN:
1145                 /* this urb is terminated, clean up */
1146                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1147                         __func__, status);
1148                 return;
1149         default:
1150                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1151                         __func__, status);
1152                 goto exit;
1153         }
1154
1155         usb_serial_debug_data(&port->dev, __func__,
1156                               urb->actual_length, urb->transfer_buffer);
1157
1158         pl2303_update_line_status(port, data, actual_length);
1159
1160 exit:
1161         retval = usb_submit_urb(urb, GFP_ATOMIC);
1162         if (retval) {
1163                 dev_err(&port->dev,
1164                         "%s - usb_submit_urb failed with result %d\n",
1165                         __func__, retval);
1166         }
1167 }
1168
1169 static void pl2303_process_read_urb(struct urb *urb)
1170 {
1171         struct usb_serial_port *port = urb->context;
1172         struct pl2303_private *priv = usb_get_serial_port_data(port);
1173         unsigned char *data = urb->transfer_buffer;
1174         char tty_flag = TTY_NORMAL;
1175         unsigned long flags;
1176         u8 line_status;
1177         int i;
1178
1179         /* update line status */
1180         spin_lock_irqsave(&priv->lock, flags);
1181         line_status = priv->line_status;
1182         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1183         spin_unlock_irqrestore(&priv->lock, flags);
1184
1185         if (!urb->actual_length)
1186                 return;
1187
1188         /*
1189          * Break takes precedence over parity, which takes precedence over
1190          * framing errors.
1191          */
1192         if (line_status & UART_BREAK_ERROR)
1193                 tty_flag = TTY_BREAK;
1194         else if (line_status & UART_PARITY_ERROR)
1195                 tty_flag = TTY_PARITY;
1196         else if (line_status & UART_FRAME_ERROR)
1197                 tty_flag = TTY_FRAME;
1198
1199         if (tty_flag != TTY_NORMAL)
1200                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1201                                                                 tty_flag);
1202         /* overrun is special, not associated with a char */
1203         if (line_status & UART_OVERRUN_ERROR)
1204                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1205
1206         if (port->sysrq) {
1207                 for (i = 0; i < urb->actual_length; ++i)
1208                         if (!usb_serial_handle_sysrq_char(port, data[i]))
1209                                 tty_insert_flip_char(&port->port, data[i],
1210                                                 tty_flag);
1211         } else {
1212                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1213                                                         urb->actual_length);
1214         }
1215
1216         tty_flip_buffer_push(&port->port);
1217 }
1218
1219 static struct usb_serial_driver pl2303_device = {
1220         .driver = {
1221                 .owner =        THIS_MODULE,
1222                 .name =         "pl2303",
1223         },
1224         .id_table =             id_table,
1225         .num_bulk_in =          1,
1226         .num_bulk_out =         1,
1227         .num_interrupt_in =     0,      /* see pl2303_calc_num_ports */
1228         .bulk_in_size =         256,
1229         .bulk_out_size =        256,
1230         .open =                 pl2303_open,
1231         .close =                pl2303_close,
1232         .dtr_rts =              pl2303_dtr_rts,
1233         .carrier_raised =       pl2303_carrier_raised,
1234         .break_ctl =            pl2303_break_ctl,
1235         .set_termios =          pl2303_set_termios,
1236         .tiocmget =             pl2303_tiocmget,
1237         .tiocmset =             pl2303_tiocmset,
1238         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1239         .process_read_urb =     pl2303_process_read_urb,
1240         .read_int_callback =    pl2303_read_int_callback,
1241         .probe =                pl2303_probe,
1242         .calc_num_ports =       pl2303_calc_num_ports,
1243         .attach =               pl2303_startup,
1244         .release =              pl2303_release,
1245         .port_probe =           pl2303_port_probe,
1246         .port_remove =          pl2303_port_remove,
1247 };
1248
1249 static struct usb_serial_driver * const serial_drivers[] = {
1250         &pl2303_device, NULL
1251 };
1252
1253 module_usb_serial_driver(serial_drivers, id_table);
1254
1255 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1256 MODULE_LICENSE("GPL v2");