drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2003 IBM Corp.
   6  *
   7  * Original driver for 2.2.x by anonymous
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License version
  11  *      2 as published by the Free Software Foundation.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this
  14  * driver
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/slab.h>
  20 #include <linux/tty.h>
  21 #include <linux/tty_driver.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial.h>
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/usb.h>
  29 #include <linux/usb/serial.h>
  30 #include <asm/unaligned.h>
  31 #include "pl2303.h"
  32
  33
  34 #define PL2303_QUIRK_UART_STATE_IDX0            BIT(0)
  35 #define PL2303_QUIRK_LEGACY                     BIT(1)
  36
  37 static const struct usb_device_id id_table[] = {
  38         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  39         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  40         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  41         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  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(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  50         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  51         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  52         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  53         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  54         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  55         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  56         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  57         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  58         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  59         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  60         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  61         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  62         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  63         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  64         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  65         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  66                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  67         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  68                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  69         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  70                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  71         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
  72         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  73         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  74         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  75         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  76         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  77         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  78         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  79         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  80         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  81         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
  82         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  83         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  84         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  85         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
  86         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
  87         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
  88         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
  89         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
  90         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
  91         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
  92         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
  93         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
  94         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
  95         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
  96         { }                                     /* Terminating entry */
  97 };
  98
  99 MODULE_DEVICE_TABLE(usb, id_table);
 100
 101 #define SET_LINE_REQUEST_TYPE           0x21
 102 #define SET_LINE_REQUEST                0x20
 103
 104 #define SET_CONTROL_REQUEST_TYPE        0x21
 105 #define SET_CONTROL_REQUEST             0x22
 106 #define CONTROL_DTR                     0x01
 107 #define CONTROL_RTS                     0x02
 108
 109 #define BREAK_REQUEST_TYPE              0x21
 110 #define BREAK_REQUEST                   0x23
 111 #define BREAK_ON                        0xffff
 112 #define BREAK_OFF                       0x0000
 113
 114 #define GET_LINE_REQUEST_TYPE           0xa1
 115 #define GET_LINE_REQUEST                0x21
 116
 117 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 118 #define VENDOR_WRITE_REQUEST            0x01
 119
 120 #define VENDOR_READ_REQUEST_TYPE        0xc0
 121 #define VENDOR_READ_REQUEST             0x01
 122
 123 #define UART_STATE_INDEX                8
 124 #define UART_STATE_MSR_MASK             0x8b
 125 #define UART_STATE_TRANSIENT_MASK       0x74
 126 #define UART_DCD                        0x01
 127 #define UART_DSR                        0x02
 128 #define UART_BREAK_ERROR                0x04
 129 #define UART_RING                       0x08
 130 #define UART_FRAME_ERROR                0x10
 131 #define UART_PARITY_ERROR               0x20
 132 #define UART_OVERRUN_ERROR              0x40
 133 #define UART_CTS                        0x80
 134
 135
 136 enum pl2303_type {
 137         TYPE_01,        /* Type 0 and 1 (difference unknown) */
 138         TYPE_HX,        /* HX version of the pl2303 chip */
 139         TYPE_COUNT
 140 };
 141
 142 struct pl2303_type_data {
 143         speed_t max_baud_rate;
 144         unsigned long quirks;
 145 };
 146
 147 struct pl2303_serial_private {
 148         const struct pl2303_type_data *type;
 149         unsigned long quirks;
 150 };
 151
 152 struct pl2303_private {
 153         spinlock_t lock;
 154         u8 line_control;
 155         u8 line_status;
 156
 157         u8 line_settings[7];
 158 };
 159
 160 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 161         [TYPE_01] = {
 162                 .max_baud_rate =        1228800,
 163                 .quirks =               PL2303_QUIRK_LEGACY,
 164         },
 165         [TYPE_HX] = {
 166                 .max_baud_rate =        12000000,
 167         },
 168 };
 169
 170 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 171                                                         unsigned char buf[1])
 172 {
 173         struct device *dev = &serial->interface->dev;
 174         int res;
 175
 176         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 177                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 178                         value, 0, buf, 1, 100);
 179         if (res != 1) {
 180                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 181                                                                 value, res);
 182                 if (res >= 0)
 183                         res = -EIO;
 184
 185                 return res;
 186         }
 187
 188         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 189
 190         return 0;
 191 }
 192
 193 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 194 {
 195         struct device *dev = &serial->interface->dev;
 196         int res;
 197
 198         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 199
 200         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 201                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 202                         value, index, NULL, 0, 100);
 203         if (res) {
 204                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 205                                                                 value, res);
 206                 return res;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int pl2303_probe(struct usb_serial *serial,
 213                                         const struct usb_device_id *id)
 214 {
 215         usb_set_serial_data(serial, (void *)id->driver_info);
 216
 217         return 0;
 218 }
 219
 220 static int pl2303_startup(struct usb_serial *serial)
 221 {
 222         struct pl2303_serial_private *spriv;
 223         enum pl2303_type type = TYPE_01;
 224         unsigned char *buf;
 225
 226         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 227         if (!spriv)
 228                 return -ENOMEM;
 229
 230         buf = kmalloc(1, GFP_KERNEL);
 231         if (!buf) {
 232                 kfree(spriv);
 233                 return -ENOMEM;
 234         }
 235
 236         if (serial->dev->descriptor.bDeviceClass == 0x02)
 237                 type = TYPE_01;         /* type 0 */
 238         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 239                 type = TYPE_HX;
 240         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 241                 type = TYPE_01;         /* type 1 */
 242         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 243                 type = TYPE_01;         /* type 1 */
 244         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 245
 246         spriv->type = &pl2303_type_data[type];
 247         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 248         spriv->quirks |= spriv->type->quirks;
 249
 250         usb_set_serial_data(serial, spriv);
 251
 252         pl2303_vendor_read(serial, 0x8484, buf);
 253         pl2303_vendor_write(serial, 0x0404, 0);
 254         pl2303_vendor_read(serial, 0x8484, buf);
 255         pl2303_vendor_read(serial, 0x8383, buf);
 256         pl2303_vendor_read(serial, 0x8484, buf);
 257         pl2303_vendor_write(serial, 0x0404, 1);
 258         pl2303_vendor_read(serial, 0x8484, buf);
 259         pl2303_vendor_read(serial, 0x8383, buf);
 260         pl2303_vendor_write(serial, 0, 1);
 261         pl2303_vendor_write(serial, 1, 0);
 262         if (spriv->quirks & PL2303_QUIRK_LEGACY)
 263                 pl2303_vendor_write(serial, 2, 0x24);
 264         else
 265                 pl2303_vendor_write(serial, 2, 0x44);
 266
 267         kfree(buf);
 268
 269         return 0;
 270 }
 271
 272 static void pl2303_release(struct usb_serial *serial)
 273 {
 274         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 275
 276         kfree(spriv);
 277 }
 278
 279 static int pl2303_port_probe(struct usb_serial_port *port)
 280 {
 281         struct pl2303_private *priv;
 282
 283         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 284         if (!priv)
 285                 return -ENOMEM;
 286
 287         spin_lock_init(&priv->lock);
 288
 289         usb_set_serial_port_data(port, priv);
 290
 291         port->port.drain_delay = 256;
 292
 293         return 0;
 294 }
 295
 296 static int pl2303_port_remove(struct usb_serial_port *port)
 297 {
 298         struct pl2303_private *priv = usb_get_serial_port_data(port);
 299
 300         kfree(priv);
 301
 302         return 0;
 303 }
 304
 305 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 306 {
 307         struct usb_device *dev = port->serial->dev;
 308         int retval;
 309
 310         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 311
 312         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 313                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 314                                  value, 0, NULL, 0, 100);
 315         if (retval)
 316                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 317
 318         return retval;
 319 }
 320
 321 /*
 322  * Returns the nearest supported baud rate that can be set directly without
 323  * using divisors.
 324  */
 325 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 326 {
 327         static const speed_t baud_sup[] = {
 328                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 329                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 330                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 331         };
 332
 333         unsigned i;
 334
 335         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 336                 if (baud_sup[i] > baud)
 337                         break;
 338         }
 339
 340         if (i == ARRAY_SIZE(baud_sup))
 341                 baud = baud_sup[i - 1];
 342         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 343                 baud = baud_sup[i - 1];
 344         else
 345                 baud = baud_sup[i];
 346
 347         return baud;
 348 }
 349
 350 /*
 351  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 352  *       use 9600 baud.
 353  */
 354 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 355                                                                 speed_t baud)
 356 {
 357         put_unaligned_le32(baud, buf);
 358
 359         return baud;
 360 }
 361
 362 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 363                                                                 speed_t baud)
 364 {
 365         unsigned int tmp;
 366
 367         /*
 368          * Apparently the formula is:
 369          * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
 370          */
 371         tmp = 12000000 * 32 / baud;
 372         buf[3] = 0x80;
 373         buf[2] = 0;
 374         buf[1] = (tmp >= 256);
 375         while (tmp >= 256) {
 376                 tmp >>= 2;
 377                 buf[1] <<= 1;
 378         }
 379         buf[0] = tmp;
 380
 381         return baud;
 382 }
 383
 384 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 385                                         struct usb_serial_port *port,
 386                                         u8 buf[4])
 387 {
 388         struct usb_serial *serial = port->serial;
 389         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 390         speed_t baud_sup;
 391         speed_t baud;
 392
 393         baud = tty_get_baud_rate(tty);
 394         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 395         if (!baud)
 396                 return;
 397
 398         if (spriv->type->max_baud_rate)
 399                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 400         /*
 401          * Use direct method for supported baud rates, otherwise use divisors.
 402          */
 403         baud_sup = pl2303_get_supported_baud_rate(baud);
 404
 405         if (baud == baud_sup)
 406                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 407         else
 408                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 409
 410         /* Save resulting baud rate */
 411         tty_encode_baud_rate(tty, baud, baud);
 412         dev_dbg(&port->dev, "baud set = %u\n", baud);
 413 }
 414
 415 static int pl2303_get_line_request(struct usb_serial_port *port,
 416                                                         unsigned char buf[7])
 417 {
 418         struct usb_device *udev = port->serial->dev;
 419         int ret;
 420
 421         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 422                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 423                                 0, 0, buf, 7, 100);
 424         if (ret != 7) {
 425                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 426
 427                 if (ret > 0)
 428                         ret = -EIO;
 429
 430                 return ret;
 431         }
 432
 433         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 434
 435         return 0;
 436 }
 437
 438 static int pl2303_set_line_request(struct usb_serial_port *port,
 439                                                         unsigned char buf[7])
 440 {
 441         struct usb_device *udev = port->serial->dev;
 442         int ret;
 443
 444         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 445                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 446                                 0, 0, buf, 7, 100);
 447         if (ret != 7) {
 448                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 449
 450                 if (ret > 0)
 451                         ret = -EIO;
 452
 453                 return ret;
 454         }
 455
 456         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 457
 458         return 0;
 459 }
 460
 461 static void pl2303_set_termios(struct tty_struct *tty,
 462                 struct usb_serial_port *port, struct ktermios *old_termios)
 463 {
 464         struct usb_serial *serial = port->serial;
 465         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 466         struct pl2303_private *priv = usb_get_serial_port_data(port);
 467         unsigned long flags;
 468         unsigned char *buf;
 469         int ret;
 470         u8 control;
 471
 472         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 473                 return;
 474
 475         buf = kzalloc(7, GFP_KERNEL);
 476         if (!buf) {
 477                 /* Report back no change occurred */
 478                 if (old_termios)
 479                         tty->termios = *old_termios;
 480                 return;
 481         }
 482
 483         pl2303_get_line_request(port, buf);
 484
 485         switch (C_CSIZE(tty)) {
 486         case CS5:
 487                 buf[6] = 5;
 488                 break;
 489         case CS6:
 490                 buf[6] = 6;
 491                 break;
 492         case CS7:
 493                 buf[6] = 7;
 494                 break;
 495         default:
 496         case CS8:
 497                 buf[6] = 8;
 498         }
 499         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 500
 501         /* For reference buf[0]:buf[3] baud rate value */
 502         pl2303_encode_baud_rate(tty, port, &buf[0]);
 503
 504         /* For reference buf[4]=0 is 1 stop bits */
 505         /* For reference buf[4]=1 is 1.5 stop bits */
 506         /* For reference buf[4]=2 is 2 stop bits */
 507         if (C_CSTOPB(tty)) {
 508                 /*
 509                  * NOTE: Comply with "real" UARTs / RS232:
 510                  *       use 1.5 instead of 2 stop bits with 5 data bits
 511                  */
 512                 if (C_CSIZE(tty) == CS5) {
 513                         buf[4] = 1;
 514                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 515                 } else {
 516                         buf[4] = 2;
 517                         dev_dbg(&port->dev, "stop bits = 2\n");
 518                 }
 519         } else {
 520                 buf[4] = 0;
 521                 dev_dbg(&port->dev, "stop bits = 1\n");
 522         }
 523
 524         if (C_PARENB(tty)) {
 525                 /* For reference buf[5]=0 is none parity */
 526                 /* For reference buf[5]=1 is odd parity */
 527                 /* For reference buf[5]=2 is even parity */
 528                 /* For reference buf[5]=3 is mark parity */
 529                 /* For reference buf[5]=4 is space parity */
 530                 if (C_PARODD(tty)) {
 531                         if (C_CMSPAR(tty)) {
 532                                 buf[5] = 3;
 533                                 dev_dbg(&port->dev, "parity = mark\n");
 534                         } else {
 535                                 buf[5] = 1;
 536                                 dev_dbg(&port->dev, "parity = odd\n");
 537                         }
 538                 } else {
 539                         if (C_CMSPAR(tty)) {
 540                                 buf[5] = 4;
 541                                 dev_dbg(&port->dev, "parity = space\n");
 542                         } else {
 543                                 buf[5] = 2;
 544                                 dev_dbg(&port->dev, "parity = even\n");
 545                         }
 546                 }
 547         } else {
 548                 buf[5] = 0;
 549                 dev_dbg(&port->dev, "parity = none\n");
 550         }
 551
 552         /*
 553          * Some PL2303 are known to lose bytes if you change serial settings
 554          * even to the same values as before. Thus we actually need to filter
 555          * in this specific case.
 556          *
 557          * Note that the tty_termios_hw_change check above is not sufficient
 558          * as a previously requested baud rate may differ from the one
 559          * actually used (and stored in old_termios).
 560          *
 561          * NOTE: No additional locking needed for line_settings as it is
 562          *       only used in set_termios, which is serialised against itself.
 563          */
 564         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 565                 ret = pl2303_set_line_request(port, buf);
 566                 if (!ret)
 567                         memcpy(priv->line_settings, buf, 7);
 568         }
 569
 570         /* change control lines if we are switching to or from B0 */
 571         spin_lock_irqsave(&priv->lock, flags);
 572         control = priv->line_control;
 573         if (C_BAUD(tty) == B0)
 574                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 575         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 576                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 577         if (control != priv->line_control) {
 578                 control = priv->line_control;
 579                 spin_unlock_irqrestore(&priv->lock, flags);
 580                 pl2303_set_control_lines(port, control);
 581         } else {
 582                 spin_unlock_irqrestore(&priv->lock, flags);
 583         }
 584
 585         if (C_CRTSCTS(tty)) {
 586                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 587                         pl2303_vendor_write(serial, 0x0, 0x41);
 588                 else
 589                         pl2303_vendor_write(serial, 0x0, 0x61);
 590         } else {
 591                 pl2303_vendor_write(serial, 0x0, 0x0);
 592         }
 593
 594         kfree(buf);
 595 }
 596
 597 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 598 {
 599         struct pl2303_private *priv = usb_get_serial_port_data(port);
 600         unsigned long flags;
 601         u8 control;
 602
 603         spin_lock_irqsave(&priv->lock, flags);
 604         if (on)
 605                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 606         else
 607                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 608         control = priv->line_control;
 609         spin_unlock_irqrestore(&priv->lock, flags);
 610
 611         pl2303_set_control_lines(port, control);
 612 }
 613
 614 static void pl2303_close(struct usb_serial_port *port)
 615 {
 616         usb_serial_generic_close(port);
 617         usb_kill_urb(port->interrupt_in_urb);
 618 }
 619
 620 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 621 {
 622         struct usb_serial *serial = port->serial;
 623         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 624         int result;
 625
 626         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 627                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 628                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 629         } else {
 630                 /* reset upstream data pipes */
 631                 pl2303_vendor_write(serial, 8, 0);
 632                 pl2303_vendor_write(serial, 9, 0);
 633         }
 634
 635         /* Setup termios */
 636         if (tty)
 637                 pl2303_set_termios(tty, port, NULL);
 638
 639         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 640         if (result) {
 641                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 642                         result);
 643                 return result;
 644         }
 645
 646         result = usb_serial_generic_open(tty, port);
 647         if (result) {
 648                 usb_kill_urb(port->interrupt_in_urb);
 649                 return result;
 650         }
 651
 652         return 0;
 653 }
 654
 655 static int pl2303_tiocmset(struct tty_struct *tty,
 656                            unsigned int set, unsigned int clear)
 657 {
 658         struct usb_serial_port *port = tty->driver_data;
 659         struct pl2303_private *priv = usb_get_serial_port_data(port);
 660         unsigned long flags;
 661         u8 control;
 662         int ret;
 663
 664         spin_lock_irqsave(&priv->lock, flags);
 665         if (set & TIOCM_RTS)
 666                 priv->line_control |= CONTROL_RTS;
 667         if (set & TIOCM_DTR)
 668                 priv->line_control |= CONTROL_DTR;
 669         if (clear & TIOCM_RTS)
 670                 priv->line_control &= ~CONTROL_RTS;
 671         if (clear & TIOCM_DTR)
 672                 priv->line_control &= ~CONTROL_DTR;
 673         control = priv->line_control;
 674         spin_unlock_irqrestore(&priv->lock, flags);
 675
 676         ret = pl2303_set_control_lines(port, control);
 677         if (ret)
 678                 return usb_translate_errors(ret);
 679
 680         return 0;
 681 }
 682
 683 static int pl2303_tiocmget(struct tty_struct *tty)
 684 {
 685         struct usb_serial_port *port = tty->driver_data;
 686         struct pl2303_private *priv = usb_get_serial_port_data(port);
 687         unsigned long flags;
 688         unsigned int mcr;
 689         unsigned int status;
 690         unsigned int result;
 691
 692         spin_lock_irqsave(&priv->lock, flags);
 693         mcr = priv->line_control;
 694         status = priv->line_status;
 695         spin_unlock_irqrestore(&priv->lock, flags);
 696
 697         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 698                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 699                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 700                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 701                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 702                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 703
 704         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 705
 706         return result;
 707 }
 708
 709 static int pl2303_carrier_raised(struct usb_serial_port *port)
 710 {
 711         struct pl2303_private *priv = usb_get_serial_port_data(port);
 712
 713         if (priv->line_status & UART_DCD)
 714                 return 1;
 715
 716         return 0;
 717 }
 718
 719 static int pl2303_ioctl(struct tty_struct *tty,
 720                         unsigned int cmd, unsigned long arg)
 721 {
 722         struct serial_struct ser;
 723         struct usb_serial_port *port = tty->driver_data;
 724
 725         switch (cmd) {
 726         case TIOCGSERIAL:
 727                 memset(&ser, 0, sizeof ser);
 728                 ser.type = PORT_16654;
 729                 ser.line = port->minor;
 730                 ser.port = port->port_number;
 731                 ser.baud_base = 460800;
 732
 733                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
 734                         return -EFAULT;
 735
 736                 return 0;
 737         default:
 738                 break;
 739         }
 740
 741         return -ENOIOCTLCMD;
 742 }
 743
 744 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
 745 {
 746         struct usb_serial_port *port = tty->driver_data;
 747         struct usb_serial *serial = port->serial;
 748         u16 state;
 749         int result;
 750
 751         if (break_state == 0)
 752                 state = BREAK_OFF;
 753         else
 754                 state = BREAK_ON;
 755
 756         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 757                         state == BREAK_OFF ? "off" : "on");
 758
 759         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 760                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 761                                  0, NULL, 0, 100);
 762         if (result)
 763                 dev_err(&port->dev, "error sending break = %d\n", result);
 764 }
 765
 766 static void pl2303_update_line_status(struct usb_serial_port *port,
 767                                       unsigned char *data,
 768                                       unsigned int actual_length)
 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         struct tty_struct *tty;
 774         unsigned long flags;
 775         unsigned int status_idx = UART_STATE_INDEX;
 776         u8 status;
 777         u8 delta;
 778
 779         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
 780                 status_idx = 0;
 781
 782         if (actual_length < status_idx + 1)
 783                 return;
 784
 785         status = data[status_idx];
 786
 787         /* Save off the uart status for others to look at */
 788         spin_lock_irqsave(&priv->lock, flags);
 789         delta = priv->line_status ^ status;
 790         priv->line_status = status;
 791         spin_unlock_irqrestore(&priv->lock, flags);
 792
 793         if (status & UART_BREAK_ERROR)
 794                 usb_serial_handle_break(port);
 795
 796         if (delta & UART_STATE_MSR_MASK) {
 797                 if (delta & UART_CTS)
 798                         port->icount.cts++;
 799                 if (delta & UART_DSR)
 800                         port->icount.dsr++;
 801                 if (delta & UART_RING)
 802                         port->icount.rng++;
 803                 if (delta & UART_DCD) {
 804                         port->icount.dcd++;
 805                         tty = tty_port_tty_get(&port->port);
 806                         if (tty) {
 807                                 usb_serial_handle_dcd_change(port, tty,
 808                                                         status & UART_DCD);
 809                                 tty_kref_put(tty);
 810                         }
 811                 }
 812
 813                 wake_up_interruptible(&port->port.delta_msr_wait);
 814         }
 815 }
 816
 817 static void pl2303_read_int_callback(struct urb *urb)
 818 {
 819         struct usb_serial_port *port =  urb->context;
 820         unsigned char *data = urb->transfer_buffer;
 821         unsigned int actual_length = urb->actual_length;
 822         int status = urb->status;
 823         int retval;
 824
 825         switch (status) {
 826         case 0:
 827                 /* success */
 828                 break;
 829         case -ECONNRESET:
 830         case -ENOENT:
 831         case -ESHUTDOWN:
 832                 /* this urb is terminated, clean up */
 833                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 834                         __func__, status);
 835                 return;
 836         default:
 837                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 838                         __func__, status);
 839                 goto exit;
 840         }
 841
 842         usb_serial_debug_data(&port->dev, __func__,
 843                               urb->actual_length, urb->transfer_buffer);
 844
 845         pl2303_update_line_status(port, data, actual_length);
 846
 847 exit:
 848         retval = usb_submit_urb(urb, GFP_ATOMIC);
 849         if (retval) {
 850                 dev_err(&port->dev,
 851                         "%s - usb_submit_urb failed with result %d\n",
 852                         __func__, retval);
 853         }
 854 }
 855
 856 static void pl2303_process_read_urb(struct urb *urb)
 857 {
 858         struct usb_serial_port *port = urb->context;
 859         struct pl2303_private *priv = usb_get_serial_port_data(port);
 860         unsigned char *data = urb->transfer_buffer;
 861         char tty_flag = TTY_NORMAL;
 862         unsigned long flags;
 863         u8 line_status;
 864         int i;
 865
 866         /* update line status */
 867         spin_lock_irqsave(&priv->lock, flags);
 868         line_status = priv->line_status;
 869         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 870         spin_unlock_irqrestore(&priv->lock, flags);
 871
 872         if (!urb->actual_length)
 873                 return;
 874
 875         /*
 876          * Break takes precedence over parity, which takes precedence over
 877          * framing errors.
 878          */
 879         if (line_status & UART_BREAK_ERROR)
 880                 tty_flag = TTY_BREAK;
 881         else if (line_status & UART_PARITY_ERROR)
 882                 tty_flag = TTY_PARITY;
 883         else if (line_status & UART_FRAME_ERROR)
 884                 tty_flag = TTY_FRAME;
 885
 886         if (tty_flag != TTY_NORMAL)
 887                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
 888                                                                 tty_flag);
 889         /* overrun is special, not associated with a char */
 890         if (line_status & UART_OVERRUN_ERROR)
 891                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 892
 893         if (port->port.console && port->sysrq) {
 894                 for (i = 0; i < urb->actual_length; ++i)
 895                         if (!usb_serial_handle_sysrq_char(port, data[i]))
 896                                 tty_insert_flip_char(&port->port, data[i],
 897                                                 tty_flag);
 898         } else {
 899                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
 900                                                         urb->actual_length);
 901         }
 902
 903         tty_flip_buffer_push(&port->port);
 904 }
 905
 906 static struct usb_serial_driver pl2303_device = {
 907         .driver = {
 908                 .owner =        THIS_MODULE,
 909                 .name =         "pl2303",
 910         },
 911         .id_table =             id_table,
 912         .num_ports =            1,
 913         .bulk_in_size =         256,
 914         .bulk_out_size =        256,
 915         .open =                 pl2303_open,
 916         .close =                pl2303_close,
 917         .dtr_rts =              pl2303_dtr_rts,
 918         .carrier_raised =       pl2303_carrier_raised,
 919         .ioctl =                pl2303_ioctl,
 920         .break_ctl =            pl2303_break_ctl,
 921         .set_termios =          pl2303_set_termios,
 922         .tiocmget =             pl2303_tiocmget,
 923         .tiocmset =             pl2303_tiocmset,
 924         .tiocmiwait =           usb_serial_generic_tiocmiwait,
 925         .process_read_urb =     pl2303_process_read_urb,
 926         .read_int_callback =    pl2303_read_int_callback,
 927         .probe =                pl2303_probe,
 928         .attach =               pl2303_startup,
 929         .release =              pl2303_release,
 930         .port_probe =           pl2303_port_probe,
 931         .port_remove =          pl2303_port_remove,
 932 };
 933
 934 static struct usb_serial_driver * const serial_drivers[] = {
 935         &pl2303_device, NULL
 936 };
 937
 938 module_usb_serial_driver(serial_drivers, id_table);
 939
 940 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
 941 MODULE_LICENSE("GPL");