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_LM930_PRODUCT_ID) },
 110         { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
 111         { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
 112         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 113         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 114         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 115         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 116         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 117         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
 118         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 119         { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
 120         { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
 121         { }                                     /* Terminating entry */
 122 };
 123
 124 MODULE_DEVICE_TABLE(usb, id_table);
 125
 126 #define SET_LINE_REQUEST_TYPE           0x21
 127 #define SET_LINE_REQUEST                0x20
 128
 129 #define SET_CONTROL_REQUEST_TYPE        0x21
 130 #define SET_CONTROL_REQUEST             0x22
 131 #define CONTROL_DTR                     0x01
 132 #define CONTROL_RTS                     0x02
 133
 134 #define BREAK_REQUEST_TYPE              0x21
 135 #define BREAK_REQUEST                   0x23
 136 #define BREAK_ON                        0xffff
 137 #define BREAK_OFF                       0x0000
 138
 139 #define GET_LINE_REQUEST_TYPE           0xa1
 140 #define GET_LINE_REQUEST                0x21
 141
 142 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 143 #define VENDOR_WRITE_REQUEST            0x01
 144 #define VENDOR_WRITE_NREQUEST           0x80
 145
 146 #define VENDOR_READ_REQUEST_TYPE        0xc0
 147 #define VENDOR_READ_REQUEST             0x01
 148 #define VENDOR_READ_NREQUEST            0x81
 149
 150 #define UART_STATE_INDEX                8
 151 #define UART_STATE_MSR_MASK             0x8b
 152 #define UART_STATE_TRANSIENT_MASK       0x74
 153 #define UART_DCD                        0x01
 154 #define UART_DSR                        0x02
 155 #define UART_BREAK_ERROR                0x04
 156 #define UART_RING                       0x08
 157 #define UART_FRAME_ERROR                0x10
 158 #define UART_PARITY_ERROR               0x20
 159 #define UART_OVERRUN_ERROR              0x40
 160 #define UART_CTS                        0x80
 161
 162 #define PL2303_FLOWCTRL_MASK            0xf0
 163
 164 #define PL2303_READ_TYPE_HX_STATUS      0x8080
 165
 166 #define PL2303_HXN_RESET_REG            0x07
 167 #define PL2303_HXN_RESET_UPSTREAM_PIPE  0x02
 168 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE        0x01
 169
 170 #define PL2303_HXN_FLOWCTRL_REG         0x0a
 171 #define PL2303_HXN_FLOWCTRL_MASK        0x1c
 172 #define PL2303_HXN_FLOWCTRL_NONE        0x1c
 173 #define PL2303_HXN_FLOWCTRL_RTS_CTS     0x18
 174 #define PL2303_HXN_FLOWCTRL_XON_XOFF    0x0c
 175
 176 static int pl2303_set_break(struct usb_serial_port *port, bool enable);
 177
 178 enum pl2303_type {
 179         TYPE_H,
 180         TYPE_HX,
 181         TYPE_TA,
 182         TYPE_TB,
 183         TYPE_HXD,
 184         TYPE_HXN,
 185         TYPE_COUNT
 186 };
 187
 188 struct pl2303_type_data {
 189         const char *name;
 190         speed_t max_baud_rate;
 191         unsigned long quirks;
 192         unsigned int no_autoxonxoff:1;
 193         unsigned int no_divisors:1;
 194         unsigned int alt_divisors:1;
 195 };
 196
 197 struct pl2303_serial_private {
 198         const struct pl2303_type_data *type;
 199         unsigned long quirks;
 200 };
 201
 202 struct pl2303_private {
 203         spinlock_t lock;
 204         u8 line_control;
 205         u8 line_status;
 206
 207         u8 line_settings[7];
 208 };
 209
 210 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 211         [TYPE_H] = {
 212                 .name                   = "H",
 213                 .max_baud_rate          = 1228800,
 214                 .quirks                 = PL2303_QUIRK_LEGACY,
 215                 .no_autoxonxoff         = true,
 216         },
 217         [TYPE_HX] = {
 218                 .name                   = "HX",
 219                 .max_baud_rate          = 6000000,
 220         },
 221         [TYPE_TA] = {
 222                 .name                   = "TA",
 223                 .max_baud_rate          = 6000000,
 224                 .alt_divisors           = true,
 225         },
 226         [TYPE_TB] = {
 227                 .name                   = "TB",
 228                 .max_baud_rate          = 12000000,
 229                 .alt_divisors           = true,
 230         },
 231         [TYPE_HXD] = {
 232                 .name                   = "HXD",
 233                 .max_baud_rate          = 12000000,
 234         },
 235         [TYPE_HXN] = {
 236                 .name                   = "G",
 237                 .max_baud_rate          = 12000000,
 238                 .no_divisors            = true,
 239         },
 240 };
 241
 242 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 243                                                         unsigned char buf[1])
 244 {
 245         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 246         struct device *dev = &serial->interface->dev;
 247         u8 request;
 248         int res;
 249
 250         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 251                 request = VENDOR_READ_NREQUEST;
 252         else
 253                 request = VENDOR_READ_REQUEST;
 254
 255         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 256                         request, VENDOR_READ_REQUEST_TYPE,
 257                         value, 0, buf, 1, 100);
 258         if (res != 1) {
 259                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 260                                                                 value, res);
 261                 if (res >= 0)
 262                         res = -EIO;
 263
 264                 return res;
 265         }
 266
 267         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 268
 269         return 0;
 270 }
 271
 272 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 273 {
 274         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 275         struct device *dev = &serial->interface->dev;
 276         u8 request;
 277         int res;
 278
 279         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 280
 281         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 282                 request = VENDOR_WRITE_NREQUEST;
 283         else
 284                 request = VENDOR_WRITE_REQUEST;
 285
 286         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 287                         request, VENDOR_WRITE_REQUEST_TYPE,
 288                         value, index, NULL, 0, 100);
 289         if (res) {
 290                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 291                                                                 value, res);
 292                 return res;
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 299 {
 300         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 301         int ret = 0;
 302         u8 *buf;
 303
 304         buf = kmalloc(1, GFP_KERNEL);
 305         if (!buf)
 306                 return -ENOMEM;
 307
 308         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 309                 ret = pl2303_vendor_read(serial, reg, buf);
 310         else
 311                 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
 312
 313         if (ret)
 314                 goto out_free;
 315
 316         *buf &= ~mask;
 317         *buf |= val & mask;
 318
 319         ret = pl2303_vendor_write(serial, reg, *buf);
 320 out_free:
 321         kfree(buf);
 322
 323         return ret;
 324 }
 325
 326 static int pl2303_probe(struct usb_serial *serial,
 327                                         const struct usb_device_id *id)
 328 {
 329         usb_set_serial_data(serial, (void *)id->driver_info);
 330
 331         return 0;
 332 }
 333
 334 /*
 335  * Use interrupt endpoint from first interface if available.
 336  *
 337  * This is needed due to the looney way its endpoints are set up.
 338  */
 339 static int pl2303_endpoint_hack(struct usb_serial *serial,
 340                                         struct usb_serial_endpoints *epds)
 341 {
 342         struct usb_interface *interface = serial->interface;
 343         struct usb_device *dev = serial->dev;
 344         struct device *ddev = &interface->dev;
 345         struct usb_host_interface *iface_desc;
 346         struct usb_endpoint_descriptor *endpoint;
 347         unsigned int i;
 348
 349         if (interface == dev->actconfig->interface[0])
 350                 return 0;
 351
 352         /* check out the endpoints of the other interface */
 353         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 354
 355         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 356                 endpoint = &iface_desc->endpoint[i].desc;
 357
 358                 if (!usb_endpoint_is_int_in(endpoint))
 359                         continue;
 360
 361                 dev_dbg(ddev, "found interrupt in on separate interface\n");
 362                 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 363                         epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int pl2303_calc_num_ports(struct usb_serial *serial,
 370                                         struct usb_serial_endpoints *epds)
 371 {
 372         unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 373         struct device *dev = &serial->interface->dev;
 374         int ret;
 375
 376         if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 377                 ret = pl2303_endpoint_hack(serial, epds);
 378                 if (ret)
 379                         return ret;
 380         }
 381
 382         if (epds->num_interrupt_in < 1) {
 383                 dev_err(dev, "required interrupt-in endpoint missing\n");
 384                 return -ENODEV;
 385         }
 386
 387         return 1;
 388 }
 389
 390 static bool pl2303_supports_hx_status(struct usb_serial *serial)
 391 {
 392         int ret;
 393         u8 buf;
 394
 395         ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
 396                         VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
 397                         0, &buf, 1, 100, GFP_KERNEL);
 398
 399         return ret == 0;
 400 }
 401
 402 static int pl2303_detect_type(struct usb_serial *serial)
 403 {
 404         struct usb_device_descriptor *desc = &serial->dev->descriptor;
 405         u16 bcdDevice, bcdUSB;
 406
 407         /*
 408          * Legacy PL2303H, variants 0 and 1 (difference unknown).
 409          */
 410         if (desc->bDeviceClass == 0x02)
 411                 return TYPE_H;          /* variant 0 */
 412
 413         if (desc->bMaxPacketSize0 != 0x40) {
 414                 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
 415                         return TYPE_H;  /* variant 1 */
 416
 417                 return TYPE_H;          /* variant 0 */
 418         }
 419
 420         bcdDevice = le16_to_cpu(desc->bcdDevice);
 421         bcdUSB = le16_to_cpu(desc->bcdUSB);
 422
 423         switch (bcdUSB) {
 424         case 0x101:
 425                 /* USB 1.0.1? Let's assume they meant 1.1... */
 426                 fallthrough;
 427         case 0x110:
 428                 switch (bcdDevice) {
 429                 case 0x300:
 430                         return TYPE_HX;
 431                 case 0x400:
 432                         return TYPE_HXD;
 433                 default:
 434                         return TYPE_HX;
 435                 }
 436                 break;
 437         case 0x200:
 438                 switch (bcdDevice) {
 439                 case 0x100:     /* GC */
 440                 case 0x105:
 441                         return TYPE_HXN;
 442                 case 0x300:     /* GT / TA */
 443                         if (pl2303_supports_hx_status(serial))
 444                                 return TYPE_TA;
 445                         fallthrough;
 446                 case 0x305:
 447                 case 0x400:     /* GL */
 448                 case 0x405:
 449                         return TYPE_HXN;
 450                 case 0x500:     /* GE / TB */
 451                         if (pl2303_supports_hx_status(serial))
 452                                 return TYPE_TB;
 453                         fallthrough;
 454                 case 0x505:
 455                 case 0x600:     /* GS */
 456                 case 0x605:
 457                 case 0x700:     /* GR */
 458                 case 0x705:
 459                         return TYPE_HXN;
 460                 }
 461                 break;
 462         }
 463
 464         dev_err(&serial->interface->dev,
 465                         "unknown device type, please report to [email protected]\n");
 466         return -ENODEV;
 467 }
 468
 469 static int pl2303_startup(struct usb_serial *serial)
 470 {
 471         struct pl2303_serial_private *spriv;
 472         enum pl2303_type type;
 473         unsigned char *buf;
 474         int ret;
 475
 476         ret = pl2303_detect_type(serial);
 477         if (ret < 0)
 478                 return ret;
 479
 480         type = ret;
 481         dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
 482
 483         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 484         if (!spriv)
 485                 return -ENOMEM;
 486
 487         spriv->type = &pl2303_type_data[type];
 488         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 489         spriv->quirks |= spriv->type->quirks;
 490
 491         usb_set_serial_data(serial, spriv);
 492
 493         if (type != TYPE_HXN) {
 494                 buf = kmalloc(1, GFP_KERNEL);
 495                 if (!buf) {
 496                         kfree(spriv);
 497                         return -ENOMEM;
 498                 }
 499
 500                 pl2303_vendor_read(serial, 0x8484, buf);
 501                 pl2303_vendor_write(serial, 0x0404, 0);
 502                 pl2303_vendor_read(serial, 0x8484, buf);
 503                 pl2303_vendor_read(serial, 0x8383, buf);
 504                 pl2303_vendor_read(serial, 0x8484, buf);
 505                 pl2303_vendor_write(serial, 0x0404, 1);
 506                 pl2303_vendor_read(serial, 0x8484, buf);
 507                 pl2303_vendor_read(serial, 0x8383, buf);
 508                 pl2303_vendor_write(serial, 0, 1);
 509                 pl2303_vendor_write(serial, 1, 0);
 510                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 511                         pl2303_vendor_write(serial, 2, 0x24);
 512                 else
 513                         pl2303_vendor_write(serial, 2, 0x44);
 514
 515                 kfree(buf);
 516         }
 517
 518         return 0;
 519 }
 520
 521 static void pl2303_release(struct usb_serial *serial)
 522 {
 523         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 524
 525         kfree(spriv);
 526 }
 527
 528 static int pl2303_port_probe(struct usb_serial_port *port)
 529 {
 530         struct pl2303_private *priv;
 531
 532         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 533         if (!priv)
 534                 return -ENOMEM;
 535
 536         spin_lock_init(&priv->lock);
 537
 538         usb_set_serial_port_data(port, priv);
 539
 540         port->port.drain_delay = 256;
 541
 542         return 0;
 543 }
 544
 545 static void pl2303_port_remove(struct usb_serial_port *port)
 546 {
 547         struct pl2303_private *priv = usb_get_serial_port_data(port);
 548
 549         kfree(priv);
 550 }
 551
 552 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 553 {
 554         struct usb_device *dev = port->serial->dev;
 555         int retval;
 556
 557         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 558
 559         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 560                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 561                                  value, 0, NULL, 0, 100);
 562         if (retval)
 563                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 564
 565         return retval;
 566 }
 567
 568 /*
 569  * Returns the nearest supported baud rate that can be set directly without
 570  * using divisors.
 571  */
 572 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 573 {
 574         static const speed_t baud_sup[] = {
 575                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 576                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 577                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 578         };
 579
 580         unsigned i;
 581
 582         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 583                 if (baud_sup[i] > baud)
 584                         break;
 585         }
 586
 587         if (i == ARRAY_SIZE(baud_sup))
 588                 baud = baud_sup[i - 1];
 589         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 590                 baud = baud_sup[i - 1];
 591         else
 592                 baud = baud_sup[i];
 593
 594         return baud;
 595 }
 596
 597 /*
 598  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 599  *       use 9600 baud.
 600  */
 601 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 602                                                                 speed_t baud)
 603 {
 604         put_unaligned_le32(baud, buf);
 605
 606         return baud;
 607 }
 608
 609 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 610                                                                 speed_t baud)
 611 {
 612         unsigned int baseline, mantissa, exponent;
 613
 614         /*
 615          * Apparently the formula is:
 616          *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 617          * where
 618          *   mantissa = buf[8:0]
 619          *   exponent = buf[11:9]
 620          */
 621         baseline = 12000000 * 32;
 622         mantissa = baseline / baud;
 623         if (mantissa == 0)
 624                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 625         exponent = 0;
 626         while (mantissa >= 512) {
 627                 if (exponent < 7) {
 628                         mantissa >>= 2; /* divide by 4 */
 629                         exponent++;
 630                 } else {
 631                         /* Exponent is maxed. Trim mantissa and leave. */
 632                         mantissa = 511;
 633                         break;
 634                 }
 635         }
 636
 637         buf[3] = 0x80;
 638         buf[2] = 0;
 639         buf[1] = exponent << 1 | mantissa >> 8;
 640         buf[0] = mantissa & 0xff;
 641
 642         /* Calculate and return the exact baud rate. */
 643         baud = (baseline / mantissa) >> (exponent << 1);
 644
 645         return baud;
 646 }
 647
 648 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
 649                                                                 speed_t baud)
 650 {
 651         unsigned int baseline, mantissa, exponent;
 652
 653         /*
 654          * Apparently, for the TA version the formula is:
 655          *   baudrate = 12M * 32 / (mantissa * 2^exponent)
 656          * where
 657          *   mantissa = buf[10:0]
 658          *   exponent = buf[15:13 16]
 659          */
 660         baseline = 12000000 * 32;
 661         mantissa = baseline / baud;
 662         if (mantissa == 0)
 663                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 664         exponent = 0;
 665         while (mantissa >= 2048) {
 666                 if (exponent < 15) {
 667                         mantissa >>= 1; /* divide by 2 */
 668                         exponent++;
 669                 } else {
 670                         /* Exponent is maxed. Trim mantissa and leave. */
 671                         mantissa = 2047;
 672                         break;
 673                 }
 674         }
 675
 676         buf[3] = 0x80;
 677         buf[2] = exponent & 0x01;
 678         buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
 679         buf[0] = mantissa & 0xff;
 680
 681         /* Calculate and return the exact baud rate. */
 682         baud = (baseline / mantissa) >> exponent;
 683
 684         return baud;
 685 }
 686
 687 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 688                                         struct usb_serial_port *port,
 689                                         u8 buf[4])
 690 {
 691         struct usb_serial *serial = port->serial;
 692         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 693         speed_t baud_sup;
 694         speed_t baud;
 695
 696         baud = tty_get_baud_rate(tty);
 697         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 698         if (!baud)
 699                 return;
 700
 701         if (spriv->type->max_baud_rate)
 702                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 703         /*
 704          * Use direct method for supported baud rates, otherwise use divisors.
 705          * Newer chip types do not support divisor encoding.
 706          */
 707         if (spriv->type->no_divisors)
 708                 baud_sup = baud;
 709         else
 710                 baud_sup = pl2303_get_supported_baud_rate(baud);
 711
 712         if (baud == baud_sup)
 713                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 714         else if (spriv->type->alt_divisors)
 715                 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
 716         else
 717                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 718
 719         /* Save resulting baud rate */
 720         tty_encode_baud_rate(tty, baud, baud);
 721         dev_dbg(&port->dev, "baud set = %u\n", baud);
 722 }
 723
 724 static int pl2303_get_line_request(struct usb_serial_port *port,
 725                                                         unsigned char buf[7])
 726 {
 727         struct usb_device *udev = port->serial->dev;
 728         int ret;
 729
 730         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 731                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 732                                 0, 0, buf, 7, 100);
 733         if (ret != 7) {
 734                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 735
 736                 if (ret >= 0)
 737                         ret = -EIO;
 738
 739                 return ret;
 740         }
 741
 742         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 743
 744         return 0;
 745 }
 746
 747 static int pl2303_set_line_request(struct usb_serial_port *port,
 748                                                         unsigned char buf[7])
 749 {
 750         struct usb_device *udev = port->serial->dev;
 751         int ret;
 752
 753         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 754                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 755                                 0, 0, buf, 7, 100);
 756         if (ret < 0) {
 757                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 758                 return ret;
 759         }
 760
 761         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 762
 763         return 0;
 764 }
 765
 766 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
 767 {
 768         bool ixon_change;
 769
 770         ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
 771                         a->c_cc[VSTART] != b->c_cc[VSTART] ||
 772                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
 773
 774         return tty_termios_hw_change(a, b) || ixon_change;
 775 }
 776
 777 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
 778 {
 779         if (!I_IXON(tty) || I_IXANY(tty))
 780                 return false;
 781
 782         if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
 783                 return false;
 784
 785         if (type->no_autoxonxoff)
 786                 return false;
 787
 788         return true;
 789 }
 790
 791 static void pl2303_set_termios(struct tty_struct *tty,
 792                                struct usb_serial_port *port,
 793                                const struct ktermios *old_termios)
 794 {
 795         struct usb_serial *serial = port->serial;
 796         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 797         struct pl2303_private *priv = usb_get_serial_port_data(port);
 798         unsigned long flags;
 799         unsigned char *buf;
 800         int ret;
 801         u8 control;
 802
 803         if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
 804                 return;
 805
 806         buf = kzalloc(7, GFP_KERNEL);
 807         if (!buf) {
 808                 /* Report back no change occurred */
 809                 if (old_termios)
 810                         tty->termios = *old_termios;
 811                 return;
 812         }
 813
 814         pl2303_get_line_request(port, buf);
 815
 816         buf[6] = tty_get_char_size(tty->termios.c_cflag);
 817         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 818
 819         /* For reference buf[0]:buf[3] baud rate value */
 820         pl2303_encode_baud_rate(tty, port, &buf[0]);
 821
 822         /* For reference buf[4]=0 is 1 stop bits */
 823         /* For reference buf[4]=1 is 1.5 stop bits */
 824         /* For reference buf[4]=2 is 2 stop bits */
 825         if (C_CSTOPB(tty)) {
 826                 /*
 827                  * NOTE: Comply with "real" UARTs / RS232:
 828                  *       use 1.5 instead of 2 stop bits with 5 data bits
 829                  */
 830                 if (C_CSIZE(tty) == CS5) {
 831                         buf[4] = 1;
 832                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 833                 } else {
 834                         buf[4] = 2;
 835                         dev_dbg(&port->dev, "stop bits = 2\n");
 836                 }
 837         } else {
 838                 buf[4] = 0;
 839                 dev_dbg(&port->dev, "stop bits = 1\n");
 840         }
 841
 842         if (C_PARENB(tty)) {
 843                 /* For reference buf[5]=0 is none parity */
 844                 /* For reference buf[5]=1 is odd parity */
 845                 /* For reference buf[5]=2 is even parity */
 846                 /* For reference buf[5]=3 is mark parity */
 847                 /* For reference buf[5]=4 is space parity */
 848                 if (C_PARODD(tty)) {
 849                         if (C_CMSPAR(tty)) {
 850                                 buf[5] = 3;
 851                                 dev_dbg(&port->dev, "parity = mark\n");
 852                         } else {
 853                                 buf[5] = 1;
 854                                 dev_dbg(&port->dev, "parity = odd\n");
 855                         }
 856                 } else {
 857                         if (C_CMSPAR(tty)) {
 858                                 buf[5] = 4;
 859                                 dev_dbg(&port->dev, "parity = space\n");
 860                         } else {
 861                                 buf[5] = 2;
 862                                 dev_dbg(&port->dev, "parity = even\n");
 863                         }
 864                 }
 865         } else {
 866                 buf[5] = 0;
 867                 dev_dbg(&port->dev, "parity = none\n");
 868         }
 869
 870         /*
 871          * Some PL2303 are known to lose bytes if you change serial settings
 872          * even to the same values as before. Thus we actually need to filter
 873          * in this specific case.
 874          *
 875          * Note that the tty_termios_hw_change check above is not sufficient
 876          * as a previously requested baud rate may differ from the one
 877          * actually used (and stored in old_termios).
 878          *
 879          * NOTE: No additional locking needed for line_settings as it is
 880          *       only used in set_termios, which is serialised against itself.
 881          */
 882         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 883                 ret = pl2303_set_line_request(port, buf);
 884                 if (!ret)
 885                         memcpy(priv->line_settings, buf, 7);
 886         }
 887
 888         /* change control lines if we are switching to or from B0 */
 889         spin_lock_irqsave(&priv->lock, flags);
 890         control = priv->line_control;
 891         if (C_BAUD(tty) == B0)
 892                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 893         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 894                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 895         if (control != priv->line_control) {
 896                 control = priv->line_control;
 897                 spin_unlock_irqrestore(&priv->lock, flags);
 898                 pl2303_set_control_lines(port, control);
 899         } else {
 900                 spin_unlock_irqrestore(&priv->lock, flags);
 901         }
 902
 903         if (C_CRTSCTS(tty)) {
 904                 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 905                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
 906                 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 907                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 908                                         PL2303_HXN_FLOWCTRL_MASK,
 909                                         PL2303_HXN_FLOWCTRL_RTS_CTS);
 910                 } else {
 911                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
 912                 }
 913         } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
 914                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 915                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 916                                         PL2303_HXN_FLOWCTRL_MASK,
 917                                         PL2303_HXN_FLOWCTRL_XON_XOFF);
 918                 } else {
 919                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
 920                 }
 921         } else {
 922                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 923                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 924                                         PL2303_HXN_FLOWCTRL_MASK,
 925                                         PL2303_HXN_FLOWCTRL_NONE);
 926                 } else {
 927                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 928                 }
 929         }
 930
 931         kfree(buf);
 932 }
 933
 934 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 935 {
 936         struct pl2303_private *priv = usb_get_serial_port_data(port);
 937         unsigned long flags;
 938         u8 control;
 939
 940         spin_lock_irqsave(&priv->lock, flags);
 941         if (on)
 942                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 943         else
 944                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 945         control = priv->line_control;
 946         spin_unlock_irqrestore(&priv->lock, flags);
 947
 948         pl2303_set_control_lines(port, control);
 949 }
 950
 951 static void pl2303_close(struct usb_serial_port *port)
 952 {
 953         usb_serial_generic_close(port);
 954         usb_kill_urb(port->interrupt_in_urb);
 955         pl2303_set_break(port, false);
 956 }
 957
 958 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 959 {
 960         struct usb_serial *serial = port->serial;
 961         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 962         int result;
 963
 964         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 965                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 966                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 967         } else {
 968                 /* reset upstream data pipes */
 969                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 970                         pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
 971                                         PL2303_HXN_RESET_UPSTREAM_PIPE |
 972                                         PL2303_HXN_RESET_DOWNSTREAM_PIPE);
 973                 } else {
 974                         pl2303_vendor_write(serial, 8, 0);
 975                         pl2303_vendor_write(serial, 9, 0);
 976                 }
 977         }
 978
 979         /* Setup termios */
 980         if (tty)
 981                 pl2303_set_termios(tty, port, NULL);
 982
 983         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 984         if (result) {
 985                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 986                         result);
 987                 return result;
 988         }
 989
 990         result = usb_serial_generic_open(tty, port);
 991         if (result) {
 992                 usb_kill_urb(port->interrupt_in_urb);
 993                 return result;
 994         }
 995
 996         return 0;
 997 }
 998
 999 static int pl2303_tiocmset(struct tty_struct *tty,
1000                            unsigned int set, unsigned int clear)
1001 {
1002         struct usb_serial_port *port = tty->driver_data;
1003         struct pl2303_private *priv = usb_get_serial_port_data(port);
1004         unsigned long flags;
1005         u8 control;
1006         int ret;
1007
1008         spin_lock_irqsave(&priv->lock, flags);
1009         if (set & TIOCM_RTS)
1010                 priv->line_control |= CONTROL_RTS;
1011         if (set & TIOCM_DTR)
1012                 priv->line_control |= CONTROL_DTR;
1013         if (clear & TIOCM_RTS)
1014                 priv->line_control &= ~CONTROL_RTS;
1015         if (clear & TIOCM_DTR)
1016                 priv->line_control &= ~CONTROL_DTR;
1017         control = priv->line_control;
1018         spin_unlock_irqrestore(&priv->lock, flags);
1019
1020         ret = pl2303_set_control_lines(port, control);
1021         if (ret)
1022                 return usb_translate_errors(ret);
1023
1024         return 0;
1025 }
1026
1027 static int pl2303_tiocmget(struct tty_struct *tty)
1028 {
1029         struct usb_serial_port *port = tty->driver_data;
1030         struct pl2303_private *priv = usb_get_serial_port_data(port);
1031         unsigned long flags;
1032         unsigned int mcr;
1033         unsigned int status;
1034         unsigned int result;
1035
1036         spin_lock_irqsave(&priv->lock, flags);
1037         mcr = priv->line_control;
1038         status = priv->line_status;
1039         spin_unlock_irqrestore(&priv->lock, flags);
1040
1041         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
1042                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
1043                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
1044                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
1045                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
1046                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
1047
1048         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1049
1050         return result;
1051 }
1052
1053 static int pl2303_carrier_raised(struct usb_serial_port *port)
1054 {
1055         struct pl2303_private *priv = usb_get_serial_port_data(port);
1056
1057         if (priv->line_status & UART_DCD)
1058                 return 1;
1059
1060         return 0;
1061 }
1062
1063 static int pl2303_set_break(struct usb_serial_port *port, bool enable)
1064 {
1065         struct usb_serial *serial = port->serial;
1066         u16 state;
1067         int result;
1068
1069         if (enable)
1070                 state = BREAK_ON;
1071         else
1072                 state = BREAK_OFF;
1073
1074         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1075                         state == BREAK_OFF ? "off" : "on");
1076
1077         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1078                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1079                                  0, NULL, 0, 100);
1080         if (result) {
1081                 dev_err(&port->dev, "error sending break = %d\n", result);
1082                 return result;
1083         }
1084
1085         return 0;
1086 }
1087
1088 static int pl2303_break_ctl(struct tty_struct *tty, int state)
1089 {
1090         struct usb_serial_port *port = tty->driver_data;
1091
1092         return pl2303_set_break(port, state);
1093 }
1094
1095 static void pl2303_update_line_status(struct usb_serial_port *port,
1096                                       unsigned char *data,
1097                                       unsigned int actual_length)
1098 {
1099         struct usb_serial *serial = port->serial;
1100         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1101         struct pl2303_private *priv = usb_get_serial_port_data(port);
1102         struct tty_struct *tty;
1103         unsigned long flags;
1104         unsigned int status_idx = UART_STATE_INDEX;
1105         u8 status;
1106         u8 delta;
1107
1108         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1109                 status_idx = 0;
1110
1111         if (actual_length < status_idx + 1)
1112                 return;
1113
1114         status = data[status_idx];
1115
1116         /* Save off the uart status for others to look at */
1117         spin_lock_irqsave(&priv->lock, flags);
1118         delta = priv->line_status ^ status;
1119         priv->line_status = status;
1120         spin_unlock_irqrestore(&priv->lock, flags);
1121
1122         if (status & UART_BREAK_ERROR)
1123                 usb_serial_handle_break(port);
1124
1125         if (delta & UART_STATE_MSR_MASK) {
1126                 if (delta & UART_CTS)
1127                         port->icount.cts++;
1128                 if (delta & UART_DSR)
1129                         port->icount.dsr++;
1130                 if (delta & UART_RING)
1131                         port->icount.rng++;
1132                 if (delta & UART_DCD) {
1133                         port->icount.dcd++;
1134                         tty = tty_port_tty_get(&port->port);
1135                         if (tty) {
1136                                 usb_serial_handle_dcd_change(port, tty,
1137                                                         status & UART_DCD);
1138                                 tty_kref_put(tty);
1139                         }
1140                 }
1141
1142                 wake_up_interruptible(&port->port.delta_msr_wait);
1143         }
1144 }
1145
1146 static void pl2303_read_int_callback(struct urb *urb)
1147 {
1148         struct usb_serial_port *port =  urb->context;
1149         unsigned char *data = urb->transfer_buffer;
1150         unsigned int actual_length = urb->actual_length;
1151         int status = urb->status;
1152         int retval;
1153
1154         switch (status) {
1155         case 0:
1156                 /* success */
1157                 break;
1158         case -ECONNRESET:
1159         case -ENOENT:
1160         case -ESHUTDOWN:
1161                 /* this urb is terminated, clean up */
1162                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1163                         __func__, status);
1164                 return;
1165         default:
1166                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1167                         __func__, status);
1168                 goto exit;
1169         }
1170
1171         usb_serial_debug_data(&port->dev, __func__,
1172                               urb->actual_length, urb->transfer_buffer);
1173
1174         pl2303_update_line_status(port, data, actual_length);
1175
1176 exit:
1177         retval = usb_submit_urb(urb, GFP_ATOMIC);
1178         if (retval) {
1179                 dev_err(&port->dev,
1180                         "%s - usb_submit_urb failed with result %d\n",
1181                         __func__, retval);
1182         }
1183 }
1184
1185 static void pl2303_process_read_urb(struct urb *urb)
1186 {
1187         struct usb_serial_port *port = urb->context;
1188         struct pl2303_private *priv = usb_get_serial_port_data(port);
1189         unsigned char *data = urb->transfer_buffer;
1190         char tty_flag = TTY_NORMAL;
1191         unsigned long flags;
1192         u8 line_status;
1193         int i;
1194
1195         /* update line status */
1196         spin_lock_irqsave(&priv->lock, flags);
1197         line_status = priv->line_status;
1198         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1199         spin_unlock_irqrestore(&priv->lock, flags);
1200
1201         if (!urb->actual_length)
1202                 return;
1203
1204         /*
1205          * Break takes precedence over parity, which takes precedence over
1206          * framing errors.
1207          */
1208         if (line_status & UART_BREAK_ERROR)
1209                 tty_flag = TTY_BREAK;
1210         else if (line_status & UART_PARITY_ERROR)
1211                 tty_flag = TTY_PARITY;
1212         else if (line_status & UART_FRAME_ERROR)
1213                 tty_flag = TTY_FRAME;
1214
1215         if (tty_flag != TTY_NORMAL)
1216                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1217                                                                 tty_flag);
1218         /* overrun is special, not associated with a char */
1219         if (line_status & UART_OVERRUN_ERROR)
1220                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1221
1222         if (port->sysrq) {
1223                 for (i = 0; i < urb->actual_length; ++i)
1224                         if (!usb_serial_handle_sysrq_char(port, data[i]))
1225                                 tty_insert_flip_char(&port->port, data[i],
1226                                                 tty_flag);
1227         } else {
1228                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1229                                                         urb->actual_length);
1230         }
1231
1232         tty_flip_buffer_push(&port->port);
1233 }
1234
1235 static struct usb_serial_driver pl2303_device = {
1236         .driver = {
1237                 .owner =        THIS_MODULE,
1238                 .name =         "pl2303",
1239         },
1240         .id_table =             id_table,
1241         .num_bulk_in =          1,
1242         .num_bulk_out =         1,
1243         .num_interrupt_in =     0,      /* see pl2303_calc_num_ports */
1244         .bulk_in_size =         256,
1245         .bulk_out_size =        256,
1246         .open =                 pl2303_open,
1247         .close =                pl2303_close,
1248         .dtr_rts =              pl2303_dtr_rts,
1249         .carrier_raised =       pl2303_carrier_raised,
1250         .break_ctl =            pl2303_break_ctl,
1251         .set_termios =          pl2303_set_termios,
1252         .tiocmget =             pl2303_tiocmget,
1253         .tiocmset =             pl2303_tiocmset,
1254         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1255         .process_read_urb =     pl2303_process_read_urb,
1256         .read_int_callback =    pl2303_read_int_callback,
1257         .probe =                pl2303_probe,
1258         .calc_num_ports =       pl2303_calc_num_ports,
1259         .attach =               pl2303_startup,
1260         .release =              pl2303_release,
1261         .port_probe =           pl2303_port_probe,
1262         .port_remove =          pl2303_port_remove,
1263 };
1264
1265 static struct usb_serial_driver * const serial_drivers[] = {
1266         &pl2303_device, NULL
1267 };
1268
1269 module_usb_serial_driver(serial_drivers, id_table);
1270
1271 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1272 MODULE_LICENSE("GPL v2");