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 <linux/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 #define PL2303_QUIRK_NO_BREAK_GETLINE           BIT(3)
  35
  36 static const struct usb_device_id id_table[] = {
  37         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
  38                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  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_CHILITAG) },
  43         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  44         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  45         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  48         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  49         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
  50         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
  51         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
  52         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
  53         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
  55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
  56         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
  57         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  58         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  59         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
  60                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  61         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
  62                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  63         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
  64                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  65         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
  66         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  67         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  68         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  69         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  70         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  71         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  72         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  73         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  74         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  75         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  76         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  77         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  78         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  79                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  80         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  81                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  82         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  83                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  84         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
  85                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  86         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  87         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  88         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  89         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  90         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  91         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  92         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  93         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  94         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  95         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
  96                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  97         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  98         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  99         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
 100         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
 101         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
 102         { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
 103         { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
 104         { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
 105         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
 106         { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
 107         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 108         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 109         { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
 110         { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) },
 111         { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
 112         { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
 113         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 114         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 115         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 116         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 117         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 118         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
 119         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 120         { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
 121         { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
 122         { USB_DEVICE(MACROSILICON_VENDOR_ID, MACROSILICON_MS3020_PRODUCT_ID) },
 123         { }                                     /* Terminating entry */
 124 };
 125
 126 MODULE_DEVICE_TABLE(usb, id_table);
 127
 128 #define SET_LINE_REQUEST_TYPE           0x21
 129 #define SET_LINE_REQUEST                0x20
 130
 131 #define SET_CONTROL_REQUEST_TYPE        0x21
 132 #define SET_CONTROL_REQUEST             0x22
 133 #define CONTROL_DTR                     0x01
 134 #define CONTROL_RTS                     0x02
 135
 136 #define BREAK_REQUEST_TYPE              0x21
 137 #define BREAK_REQUEST                   0x23
 138 #define BREAK_ON                        0xffff
 139 #define BREAK_OFF                       0x0000
 140
 141 #define GET_LINE_REQUEST_TYPE           0xa1
 142 #define GET_LINE_REQUEST                0x21
 143
 144 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 145 #define VENDOR_WRITE_REQUEST            0x01
 146 #define VENDOR_WRITE_NREQUEST           0x80
 147
 148 #define VENDOR_READ_REQUEST_TYPE        0xc0
 149 #define VENDOR_READ_REQUEST             0x01
 150 #define VENDOR_READ_NREQUEST            0x81
 151
 152 #define UART_STATE_INDEX                8
 153 #define UART_STATE_MSR_MASK             0x8b
 154 #define UART_STATE_TRANSIENT_MASK       0x74
 155 #define UART_DCD                        0x01
 156 #define UART_DSR                        0x02
 157 #define UART_BREAK_ERROR                0x04
 158 #define UART_RING                       0x08
 159 #define UART_FRAME_ERROR                0x10
 160 #define UART_PARITY_ERROR               0x20
 161 #define UART_OVERRUN_ERROR              0x40
 162 #define UART_CTS                        0x80
 163
 164 #define PL2303_FLOWCTRL_MASK            0xf0
 165
 166 #define PL2303_READ_TYPE_HX_STATUS      0x8080
 167
 168 #define PL2303_HXN_RESET_REG            0x07
 169 #define PL2303_HXN_RESET_UPSTREAM_PIPE  0x02
 170 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE        0x01
 171
 172 #define PL2303_HXN_FLOWCTRL_REG         0x0a
 173 #define PL2303_HXN_FLOWCTRL_MASK        0x1c
 174 #define PL2303_HXN_FLOWCTRL_NONE        0x1c
 175 #define PL2303_HXN_FLOWCTRL_RTS_CTS     0x18
 176 #define PL2303_HXN_FLOWCTRL_XON_XOFF    0x0c
 177
 178 static int pl2303_set_break(struct usb_serial_port *port, bool enable);
 179
 180 enum pl2303_type {
 181         TYPE_H,
 182         TYPE_HX,
 183         TYPE_TA,
 184         TYPE_TB,
 185         TYPE_HXD,
 186         TYPE_HXN,
 187         TYPE_COUNT
 188 };
 189
 190 struct pl2303_type_data {
 191         const char *name;
 192         speed_t max_baud_rate;
 193         unsigned long quirks;
 194         unsigned int no_autoxonxoff:1;
 195         unsigned int no_divisors:1;
 196         unsigned int alt_divisors:1;
 197 };
 198
 199 struct pl2303_serial_private {
 200         const struct pl2303_type_data *type;
 201         unsigned long quirks;
 202 };
 203
 204 struct pl2303_private {
 205         spinlock_t lock;
 206         u8 line_control;
 207         u8 line_status;
 208
 209         u8 line_settings[7];
 210 };
 211
 212 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 213         [TYPE_H] = {
 214                 .name                   = "H",
 215                 .max_baud_rate          = 1228800,
 216                 .quirks                 = PL2303_QUIRK_LEGACY,
 217                 .no_autoxonxoff         = true,
 218         },
 219         [TYPE_HX] = {
 220                 .name                   = "HX",
 221                 .max_baud_rate          = 6000000,
 222         },
 223         [TYPE_TA] = {
 224                 .name                   = "TA",
 225                 .max_baud_rate          = 6000000,
 226                 .alt_divisors           = true,
 227         },
 228         [TYPE_TB] = {
 229                 .name                   = "TB",
 230                 .max_baud_rate          = 12000000,
 231                 .alt_divisors           = true,
 232         },
 233         [TYPE_HXD] = {
 234                 .name                   = "HXD",
 235                 .max_baud_rate          = 12000000,
 236         },
 237         [TYPE_HXN] = {
 238                 .name                   = "G",
 239                 .max_baud_rate          = 12000000,
 240                 .no_divisors            = true,
 241         },
 242 };
 243
 244 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 245                                                         unsigned char buf[1])
 246 {
 247         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 248         struct device *dev = &serial->interface->dev;
 249         u8 request;
 250         int res;
 251
 252         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 253                 request = VENDOR_READ_NREQUEST;
 254         else
 255                 request = VENDOR_READ_REQUEST;
 256
 257         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 258                         request, VENDOR_READ_REQUEST_TYPE,
 259                         value, 0, buf, 1, 100);
 260         if (res != 1) {
 261                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 262                                                                 value, res);
 263                 if (res >= 0)
 264                         res = -EIO;
 265
 266                 return res;
 267         }
 268
 269         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 270
 271         return 0;
 272 }
 273
 274 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 275 {
 276         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 277         struct device *dev = &serial->interface->dev;
 278         u8 request;
 279         int res;
 280
 281         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 282
 283         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 284                 request = VENDOR_WRITE_NREQUEST;
 285         else
 286                 request = VENDOR_WRITE_REQUEST;
 287
 288         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 289                         request, VENDOR_WRITE_REQUEST_TYPE,
 290                         value, index, NULL, 0, 100);
 291         if (res) {
 292                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 293                                                                 value, res);
 294                 return res;
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 301 {
 302         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 303         int ret = 0;
 304         u8 *buf;
 305
 306         buf = kmalloc(1, GFP_KERNEL);
 307         if (!buf)
 308                 return -ENOMEM;
 309
 310         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 311                 ret = pl2303_vendor_read(serial, reg, buf);
 312         else
 313                 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
 314
 315         if (ret)
 316                 goto out_free;
 317
 318         *buf &= ~mask;
 319         *buf |= val & mask;
 320
 321         ret = pl2303_vendor_write(serial, reg, *buf);
 322 out_free:
 323         kfree(buf);
 324
 325         return ret;
 326 }
 327
 328 static int pl2303_probe(struct usb_serial *serial,
 329                                         const struct usb_device_id *id)
 330 {
 331         usb_set_serial_data(serial, (void *)id->driver_info);
 332
 333         return 0;
 334 }
 335
 336 /*
 337  * Use interrupt endpoint from first interface if available.
 338  *
 339  * This is needed due to the looney way its endpoints are set up.
 340  */
 341 static int pl2303_endpoint_hack(struct usb_serial *serial,
 342                                         struct usb_serial_endpoints *epds)
 343 {
 344         struct usb_interface *interface = serial->interface;
 345         struct usb_device *dev = serial->dev;
 346         struct device *ddev = &interface->dev;
 347         struct usb_host_interface *iface_desc;
 348         struct usb_endpoint_descriptor *endpoint;
 349         unsigned int i;
 350
 351         if (interface == dev->actconfig->interface[0])
 352                 return 0;
 353
 354         /* check out the endpoints of the other interface */
 355         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 356
 357         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 358                 endpoint = &iface_desc->endpoint[i].desc;
 359
 360                 if (!usb_endpoint_is_int_in(endpoint))
 361                         continue;
 362
 363                 dev_dbg(ddev, "found interrupt in on separate interface\n");
 364                 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 365                         epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int pl2303_calc_num_ports(struct usb_serial *serial,
 372                                         struct usb_serial_endpoints *epds)
 373 {
 374         unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 375         struct device *dev = &serial->interface->dev;
 376         int ret;
 377
 378         if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 379                 ret = pl2303_endpoint_hack(serial, epds);
 380                 if (ret)
 381                         return ret;
 382         }
 383
 384         if (epds->num_interrupt_in < 1) {
 385                 dev_err(dev, "required interrupt-in endpoint missing\n");
 386                 return -ENODEV;
 387         }
 388
 389         return 1;
 390 }
 391
 392 static bool pl2303_supports_hx_status(struct usb_serial *serial)
 393 {
 394         int ret;
 395         u8 buf;
 396
 397         ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
 398                         VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
 399                         0, &buf, 1, 100, GFP_KERNEL);
 400
 401         return ret == 0;
 402 }
 403
 404 static int pl2303_detect_type(struct usb_serial *serial)
 405 {
 406         struct usb_device_descriptor *desc = &serial->dev->descriptor;
 407         u16 bcdDevice, bcdUSB;
 408
 409         /*
 410          * Legacy PL2303H, variants 0 and 1 (difference unknown).
 411          */
 412         if (desc->bDeviceClass == 0x02)
 413                 return TYPE_H;          /* variant 0 */
 414
 415         if (desc->bMaxPacketSize0 != 0x40) {
 416                 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
 417                         return TYPE_H;  /* variant 1 */
 418
 419                 return TYPE_H;          /* variant 0 */
 420         }
 421
 422         bcdDevice = le16_to_cpu(desc->bcdDevice);
 423         bcdUSB = le16_to_cpu(desc->bcdUSB);
 424
 425         switch (bcdUSB) {
 426         case 0x101:
 427                 /* USB 1.0.1? Let's assume they meant 1.1... */
 428                 fallthrough;
 429         case 0x110:
 430                 switch (bcdDevice) {
 431                 case 0x300:
 432                         return TYPE_HX;
 433                 case 0x400:
 434                         return TYPE_HXD;
 435                 default:
 436                         return TYPE_HX;
 437                 }
 438                 break;
 439         case 0x200:
 440                 switch (bcdDevice) {
 441                 case 0x100:     /* GC */
 442                 case 0x105:
 443                         return TYPE_HXN;
 444                 case 0x300:     /* GT / TA */
 445                         if (pl2303_supports_hx_status(serial))
 446                                 return TYPE_TA;
 447                         fallthrough;
 448                 case 0x305:
 449                 case 0x400:     /* GL */
 450                 case 0x405:
 451                         return TYPE_HXN;
 452                 case 0x500:     /* GE / TB */
 453                         if (pl2303_supports_hx_status(serial))
 454                                 return TYPE_TB;
 455                         fallthrough;
 456                 case 0x505:
 457                 case 0x600:     /* GS */
 458                 case 0x605:
 459                 case 0x700:     /* GR */
 460                 case 0x705:
 461                         return TYPE_HXN;
 462                 }
 463                 break;
 464         }
 465
 466         dev_err(&serial->interface->dev,
 467                         "unknown device type, please report to [email protected]\n");
 468         return -ENODEV;
 469 }
 470
 471 static bool pl2303_is_hxd_clone(struct usb_serial *serial)
 472 {
 473         struct usb_device *udev = serial->dev;
 474         unsigned char *buf;
 475         int ret;
 476
 477         buf = kmalloc(7, GFP_KERNEL);
 478         if (!buf)
 479                 return false;
 480
 481         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 482                               GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 483                               0, 0, buf, 7, 100);
 484
 485         kfree(buf);
 486
 487         return ret == -EPIPE;
 488 }
 489
 490 static int pl2303_startup(struct usb_serial *serial)
 491 {
 492         struct pl2303_serial_private *spriv;
 493         enum pl2303_type type;
 494         unsigned char *buf;
 495         int ret;
 496
 497         ret = pl2303_detect_type(serial);
 498         if (ret < 0)
 499                 return ret;
 500
 501         type = ret;
 502         dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
 503
 504         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 505         if (!spriv)
 506                 return -ENOMEM;
 507
 508         spriv->type = &pl2303_type_data[type];
 509         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 510         spriv->quirks |= spriv->type->quirks;
 511
 512         if (type == TYPE_HXD && pl2303_is_hxd_clone(serial))
 513                 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE;
 514
 515         usb_set_serial_data(serial, spriv);
 516
 517         if (type != TYPE_HXN) {
 518                 buf = kmalloc(1, GFP_KERNEL);
 519                 if (!buf) {
 520                         kfree(spriv);
 521                         return -ENOMEM;
 522                 }
 523
 524                 pl2303_vendor_read(serial, 0x8484, buf);
 525                 pl2303_vendor_write(serial, 0x0404, 0);
 526                 pl2303_vendor_read(serial, 0x8484, buf);
 527                 pl2303_vendor_read(serial, 0x8383, buf);
 528                 pl2303_vendor_read(serial, 0x8484, buf);
 529                 pl2303_vendor_write(serial, 0x0404, 1);
 530                 pl2303_vendor_read(serial, 0x8484, buf);
 531                 pl2303_vendor_read(serial, 0x8383, buf);
 532                 pl2303_vendor_write(serial, 0, 1);
 533                 pl2303_vendor_write(serial, 1, 0);
 534                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 535                         pl2303_vendor_write(serial, 2, 0x24);
 536                 else
 537                         pl2303_vendor_write(serial, 2, 0x44);
 538
 539                 kfree(buf);
 540         }
 541
 542         return 0;
 543 }
 544
 545 static void pl2303_release(struct usb_serial *serial)
 546 {
 547         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 548
 549         kfree(spriv);
 550 }
 551
 552 static int pl2303_port_probe(struct usb_serial_port *port)
 553 {
 554         struct pl2303_private *priv;
 555
 556         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 557         if (!priv)
 558                 return -ENOMEM;
 559
 560         spin_lock_init(&priv->lock);
 561
 562         usb_set_serial_port_data(port, priv);
 563
 564         port->port.drain_delay = 256;
 565
 566         return 0;
 567 }
 568
 569 static void pl2303_port_remove(struct usb_serial_port *port)
 570 {
 571         struct pl2303_private *priv = usb_get_serial_port_data(port);
 572
 573         kfree(priv);
 574 }
 575
 576 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 577 {
 578         struct usb_device *dev = port->serial->dev;
 579         int retval;
 580
 581         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 582
 583         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 584                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 585                                  value, 0, NULL, 0, 100);
 586         if (retval)
 587                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 588
 589         return retval;
 590 }
 591
 592 /*
 593  * Returns the nearest supported baud rate that can be set directly without
 594  * using divisors.
 595  */
 596 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 597 {
 598         static const speed_t baud_sup[] = {
 599                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 600                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 601                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 602         };
 603
 604         unsigned i;
 605
 606         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 607                 if (baud_sup[i] > baud)
 608                         break;
 609         }
 610
 611         if (i == ARRAY_SIZE(baud_sup))
 612                 baud = baud_sup[i - 1];
 613         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 614                 baud = baud_sup[i - 1];
 615         else
 616                 baud = baud_sup[i];
 617
 618         return baud;
 619 }
 620
 621 /*
 622  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 623  *       use 9600 baud.
 624  */
 625 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 626                                                                 speed_t baud)
 627 {
 628         put_unaligned_le32(baud, buf);
 629
 630         return baud;
 631 }
 632
 633 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 634                                                                 speed_t baud)
 635 {
 636         unsigned int baseline, mantissa, exponent;
 637
 638         /*
 639          * Apparently the formula is:
 640          *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 641          * where
 642          *   mantissa = buf[8:0]
 643          *   exponent = buf[11:9]
 644          */
 645         baseline = 12000000 * 32;
 646         mantissa = baseline / baud;
 647         if (mantissa == 0)
 648                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 649         exponent = 0;
 650         while (mantissa >= 512) {
 651                 if (exponent < 7) {
 652                         mantissa >>= 2; /* divide by 4 */
 653                         exponent++;
 654                 } else {
 655                         /* Exponent is maxed. Trim mantissa and leave. */
 656                         mantissa = 511;
 657                         break;
 658                 }
 659         }
 660
 661         buf[3] = 0x80;
 662         buf[2] = 0;
 663         buf[1] = exponent << 1 | mantissa >> 8;
 664         buf[0] = mantissa & 0xff;
 665
 666         /* Calculate and return the exact baud rate. */
 667         baud = (baseline / mantissa) >> (exponent << 1);
 668
 669         return baud;
 670 }
 671
 672 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
 673                                                                 speed_t baud)
 674 {
 675         unsigned int baseline, mantissa, exponent;
 676
 677         /*
 678          * Apparently, for the TA version the formula is:
 679          *   baudrate = 12M * 32 / (mantissa * 2^exponent)
 680          * where
 681          *   mantissa = buf[10:0]
 682          *   exponent = buf[15:13 16]
 683          */
 684         baseline = 12000000 * 32;
 685         mantissa = baseline / baud;
 686         if (mantissa == 0)
 687                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 688         exponent = 0;
 689         while (mantissa >= 2048) {
 690                 if (exponent < 15) {
 691                         mantissa >>= 1; /* divide by 2 */
 692                         exponent++;
 693                 } else {
 694                         /* Exponent is maxed. Trim mantissa and leave. */
 695                         mantissa = 2047;
 696                         break;
 697                 }
 698         }
 699
 700         buf[3] = 0x80;
 701         buf[2] = exponent & 0x01;
 702         buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
 703         buf[0] = mantissa & 0xff;
 704
 705         /* Calculate and return the exact baud rate. */
 706         baud = (baseline / mantissa) >> exponent;
 707
 708         return baud;
 709 }
 710
 711 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 712                                         struct usb_serial_port *port,
 713                                         u8 buf[4])
 714 {
 715         struct usb_serial *serial = port->serial;
 716         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 717         speed_t baud_sup;
 718         speed_t baud;
 719
 720         baud = tty_get_baud_rate(tty);
 721         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 722         if (!baud)
 723                 return;
 724
 725         if (spriv->type->max_baud_rate)
 726                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 727         /*
 728          * Use direct method for supported baud rates, otherwise use divisors.
 729          * Newer chip types do not support divisor encoding.
 730          */
 731         if (spriv->type->no_divisors)
 732                 baud_sup = baud;
 733         else
 734                 baud_sup = pl2303_get_supported_baud_rate(baud);
 735
 736         if (baud == baud_sup)
 737                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 738         else if (spriv->type->alt_divisors)
 739                 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
 740         else
 741                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 742
 743         /* Save resulting baud rate */
 744         tty_encode_baud_rate(tty, baud, baud);
 745         dev_dbg(&port->dev, "baud set = %u\n", baud);
 746 }
 747
 748 static int pl2303_get_line_request(struct usb_serial_port *port,
 749                                                         unsigned char buf[7])
 750 {
 751         struct usb_serial *serial = port->serial;
 752         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 753         struct usb_device *udev = serial->dev;
 754         int ret;
 755
 756         if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) {
 757                 struct pl2303_private *priv = usb_get_serial_port_data(port);
 758
 759                 memcpy(buf, priv->line_settings, 7);
 760                 return 0;
 761         }
 762
 763         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 764                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 765                                 0, 0, buf, 7, 100);
 766         if (ret != 7) {
 767                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 768
 769                 if (ret >= 0)
 770                         ret = -EIO;
 771
 772                 return ret;
 773         }
 774
 775         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 776
 777         return 0;
 778 }
 779
 780 static int pl2303_set_line_request(struct usb_serial_port *port,
 781                                                         unsigned char buf[7])
 782 {
 783         struct usb_device *udev = port->serial->dev;
 784         int ret;
 785
 786         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 787                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 788                                 0, 0, buf, 7, 100);
 789         if (ret < 0) {
 790                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 791                 return ret;
 792         }
 793
 794         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 795
 796         return 0;
 797 }
 798
 799 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
 800 {
 801         bool ixon_change;
 802
 803         ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
 804                         a->c_cc[VSTART] != b->c_cc[VSTART] ||
 805                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
 806
 807         return tty_termios_hw_change(a, b) || ixon_change;
 808 }
 809
 810 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
 811 {
 812         if (!I_IXON(tty) || I_IXANY(tty))
 813                 return false;
 814
 815         if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
 816                 return false;
 817
 818         if (type->no_autoxonxoff)
 819                 return false;
 820
 821         return true;
 822 }
 823
 824 static void pl2303_set_termios(struct tty_struct *tty,
 825                                struct usb_serial_port *port,
 826                                const struct ktermios *old_termios)
 827 {
 828         struct usb_serial *serial = port->serial;
 829         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 830         struct pl2303_private *priv = usb_get_serial_port_data(port);
 831         unsigned long flags;
 832         unsigned char *buf;
 833         int ret;
 834         u8 control;
 835
 836         if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
 837                 return;
 838
 839         buf = kzalloc(7, GFP_KERNEL);
 840         if (!buf) {
 841                 /* Report back no change occurred */
 842                 if (old_termios)
 843                         tty->termios = *old_termios;
 844                 return;
 845         }
 846
 847         pl2303_get_line_request(port, buf);
 848
 849         buf[6] = tty_get_char_size(tty->termios.c_cflag);
 850         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 851
 852         /* For reference buf[0]:buf[3] baud rate value */
 853         pl2303_encode_baud_rate(tty, port, &buf[0]);
 854
 855         /* For reference buf[4]=0 is 1 stop bits */
 856         /* For reference buf[4]=1 is 1.5 stop bits */
 857         /* For reference buf[4]=2 is 2 stop bits */
 858         if (C_CSTOPB(tty)) {
 859                 /*
 860                  * NOTE: Comply with "real" UARTs / RS232:
 861                  *       use 1.5 instead of 2 stop bits with 5 data bits
 862                  */
 863                 if (C_CSIZE(tty) == CS5) {
 864                         buf[4] = 1;
 865                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 866                 } else {
 867                         buf[4] = 2;
 868                         dev_dbg(&port->dev, "stop bits = 2\n");
 869                 }
 870         } else {
 871                 buf[4] = 0;
 872                 dev_dbg(&port->dev, "stop bits = 1\n");
 873         }
 874
 875         if (C_PARENB(tty)) {
 876                 /* For reference buf[5]=0 is none parity */
 877                 /* For reference buf[5]=1 is odd parity */
 878                 /* For reference buf[5]=2 is even parity */
 879                 /* For reference buf[5]=3 is mark parity */
 880                 /* For reference buf[5]=4 is space parity */
 881                 if (C_PARODD(tty)) {
 882                         if (C_CMSPAR(tty)) {
 883                                 buf[5] = 3;
 884                                 dev_dbg(&port->dev, "parity = mark\n");
 885                         } else {
 886                                 buf[5] = 1;
 887                                 dev_dbg(&port->dev, "parity = odd\n");
 888                         }
 889                 } else {
 890                         if (C_CMSPAR(tty)) {
 891                                 buf[5] = 4;
 892                                 dev_dbg(&port->dev, "parity = space\n");
 893                         } else {
 894                                 buf[5] = 2;
 895                                 dev_dbg(&port->dev, "parity = even\n");
 896                         }
 897                 }
 898         } else {
 899                 buf[5] = 0;
 900                 dev_dbg(&port->dev, "parity = none\n");
 901         }
 902
 903         /*
 904          * Some PL2303 are known to lose bytes if you change serial settings
 905          * even to the same values as before. Thus we actually need to filter
 906          * in this specific case.
 907          *
 908          * Note that the tty_termios_hw_change check above is not sufficient
 909          * as a previously requested baud rate may differ from the one
 910          * actually used (and stored in old_termios).
 911          *
 912          * NOTE: No additional locking needed for line_settings as it is
 913          *       only used in set_termios, which is serialised against itself.
 914          */
 915         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 916                 ret = pl2303_set_line_request(port, buf);
 917                 if (!ret)
 918                         memcpy(priv->line_settings, buf, 7);
 919         }
 920
 921         /* change control lines if we are switching to or from B0 */
 922         spin_lock_irqsave(&priv->lock, flags);
 923         control = priv->line_control;
 924         if (C_BAUD(tty) == B0)
 925                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 926         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 927                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 928         if (control != priv->line_control) {
 929                 control = priv->line_control;
 930                 spin_unlock_irqrestore(&priv->lock, flags);
 931                 pl2303_set_control_lines(port, control);
 932         } else {
 933                 spin_unlock_irqrestore(&priv->lock, flags);
 934         }
 935
 936         if (C_CRTSCTS(tty)) {
 937                 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 938                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
 939                 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 940                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 941                                         PL2303_HXN_FLOWCTRL_MASK,
 942                                         PL2303_HXN_FLOWCTRL_RTS_CTS);
 943                 } else {
 944                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
 945                 }
 946         } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
 947                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 948                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 949                                         PL2303_HXN_FLOWCTRL_MASK,
 950                                         PL2303_HXN_FLOWCTRL_XON_XOFF);
 951                 } else {
 952                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
 953                 }
 954         } else {
 955                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 956                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 957                                         PL2303_HXN_FLOWCTRL_MASK,
 958                                         PL2303_HXN_FLOWCTRL_NONE);
 959                 } else {
 960                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 961                 }
 962         }
 963
 964         kfree(buf);
 965 }
 966
 967 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 968 {
 969         struct pl2303_private *priv = usb_get_serial_port_data(port);
 970         unsigned long flags;
 971         u8 control;
 972
 973         spin_lock_irqsave(&priv->lock, flags);
 974         if (on)
 975                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 976         else
 977                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 978         control = priv->line_control;
 979         spin_unlock_irqrestore(&priv->lock, flags);
 980
 981         pl2303_set_control_lines(port, control);
 982 }
 983
 984 static void pl2303_close(struct usb_serial_port *port)
 985 {
 986         usb_serial_generic_close(port);
 987         usb_kill_urb(port->interrupt_in_urb);
 988         pl2303_set_break(port, false);
 989 }
 990
 991 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 992 {
 993         struct usb_serial *serial = port->serial;
 994         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 995         int result;
 996
 997         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 998                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 999                 usb_clear_halt(serial->dev, port->read_urb->pipe);
1000         } else {
1001                 /* reset upstream data pipes */
1002                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
1003                         pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
1004                                         PL2303_HXN_RESET_UPSTREAM_PIPE |
1005                                         PL2303_HXN_RESET_DOWNSTREAM_PIPE);
1006                 } else {
1007                         pl2303_vendor_write(serial, 8, 0);
1008                         pl2303_vendor_write(serial, 9, 0);
1009                 }
1010         }
1011
1012         /* Setup termios */
1013         if (tty)
1014                 pl2303_set_termios(tty, port, NULL);
1015
1016         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1017         if (result) {
1018                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
1019                         result);
1020                 return result;
1021         }
1022
1023         result = usb_serial_generic_open(tty, port);
1024         if (result) {
1025                 usb_kill_urb(port->interrupt_in_urb);
1026                 return result;
1027         }
1028
1029         return 0;
1030 }
1031
1032 static int pl2303_tiocmset(struct tty_struct *tty,
1033                            unsigned int set, unsigned int clear)
1034 {
1035         struct usb_serial_port *port = tty->driver_data;
1036         struct pl2303_private *priv = usb_get_serial_port_data(port);
1037         unsigned long flags;
1038         u8 control;
1039         int ret;
1040
1041         spin_lock_irqsave(&priv->lock, flags);
1042         if (set & TIOCM_RTS)
1043                 priv->line_control |= CONTROL_RTS;
1044         if (set & TIOCM_DTR)
1045                 priv->line_control |= CONTROL_DTR;
1046         if (clear & TIOCM_RTS)
1047                 priv->line_control &= ~CONTROL_RTS;
1048         if (clear & TIOCM_DTR)
1049                 priv->line_control &= ~CONTROL_DTR;
1050         control = priv->line_control;
1051         spin_unlock_irqrestore(&priv->lock, flags);
1052
1053         ret = pl2303_set_control_lines(port, control);
1054         if (ret)
1055                 return usb_translate_errors(ret);
1056
1057         return 0;
1058 }
1059
1060 static int pl2303_tiocmget(struct tty_struct *tty)
1061 {
1062         struct usb_serial_port *port = tty->driver_data;
1063         struct pl2303_private *priv = usb_get_serial_port_data(port);
1064         unsigned long flags;
1065         unsigned int mcr;
1066         unsigned int status;
1067         unsigned int result;
1068
1069         spin_lock_irqsave(&priv->lock, flags);
1070         mcr = priv->line_control;
1071         status = priv->line_status;
1072         spin_unlock_irqrestore(&priv->lock, flags);
1073
1074         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
1075                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
1076                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
1077                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
1078                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
1079                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
1080
1081         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1082
1083         return result;
1084 }
1085
1086 static int pl2303_carrier_raised(struct usb_serial_port *port)
1087 {
1088         struct pl2303_private *priv = usb_get_serial_port_data(port);
1089
1090         if (priv->line_status & UART_DCD)
1091                 return 1;
1092
1093         return 0;
1094 }
1095
1096 static int pl2303_set_break(struct usb_serial_port *port, bool enable)
1097 {
1098         struct usb_serial *serial = port->serial;
1099         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1100         u16 state;
1101         int result;
1102
1103         if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE)
1104                 return -ENOTTY;
1105
1106         if (enable)
1107                 state = BREAK_ON;
1108         else
1109                 state = BREAK_OFF;
1110
1111         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1112                         state == BREAK_OFF ? "off" : "on");
1113
1114         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1115                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1116                                  0, NULL, 0, 100);
1117         if (result) {
1118                 dev_err(&port->dev, "error sending break = %d\n", result);
1119                 return result;
1120         }
1121
1122         return 0;
1123 }
1124
1125 static int pl2303_break_ctl(struct tty_struct *tty, int state)
1126 {
1127         struct usb_serial_port *port = tty->driver_data;
1128
1129         return pl2303_set_break(port, state);
1130 }
1131
1132 static void pl2303_update_line_status(struct usb_serial_port *port,
1133                                       unsigned char *data,
1134                                       unsigned int actual_length)
1135 {
1136         struct usb_serial *serial = port->serial;
1137         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1138         struct pl2303_private *priv = usb_get_serial_port_data(port);
1139         struct tty_struct *tty;
1140         unsigned long flags;
1141         unsigned int status_idx = UART_STATE_INDEX;
1142         u8 status;
1143         u8 delta;
1144
1145         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1146                 status_idx = 0;
1147
1148         if (actual_length < status_idx + 1)
1149                 return;
1150
1151         status = data[status_idx];
1152
1153         /* Save off the uart status for others to look at */
1154         spin_lock_irqsave(&priv->lock, flags);
1155         delta = priv->line_status ^ status;
1156         priv->line_status = status;
1157         spin_unlock_irqrestore(&priv->lock, flags);
1158
1159         if (status & UART_BREAK_ERROR)
1160                 usb_serial_handle_break(port);
1161
1162         if (delta & UART_STATE_MSR_MASK) {
1163                 if (delta & UART_CTS)
1164                         port->icount.cts++;
1165                 if (delta & UART_DSR)
1166                         port->icount.dsr++;
1167                 if (delta & UART_RING)
1168                         port->icount.rng++;
1169                 if (delta & UART_DCD) {
1170                         port->icount.dcd++;
1171                         tty = tty_port_tty_get(&port->port);
1172                         if (tty) {
1173                                 usb_serial_handle_dcd_change(port, tty,
1174                                                         status & UART_DCD);
1175                                 tty_kref_put(tty);
1176                         }
1177                 }
1178
1179                 wake_up_interruptible(&port->port.delta_msr_wait);
1180         }
1181 }
1182
1183 static void pl2303_read_int_callback(struct urb *urb)
1184 {
1185         struct usb_serial_port *port =  urb->context;
1186         unsigned char *data = urb->transfer_buffer;
1187         unsigned int actual_length = urb->actual_length;
1188         int status = urb->status;
1189         int retval;
1190
1191         switch (status) {
1192         case 0:
1193                 /* success */
1194                 break;
1195         case -ECONNRESET:
1196         case -ENOENT:
1197         case -ESHUTDOWN:
1198                 /* this urb is terminated, clean up */
1199                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1200                         __func__, status);
1201                 return;
1202         default:
1203                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1204                         __func__, status);
1205                 goto exit;
1206         }
1207
1208         usb_serial_debug_data(&port->dev, __func__,
1209                               urb->actual_length, urb->transfer_buffer);
1210
1211         pl2303_update_line_status(port, data, actual_length);
1212
1213 exit:
1214         retval = usb_submit_urb(urb, GFP_ATOMIC);
1215         if (retval) {
1216                 dev_err(&port->dev,
1217                         "%s - usb_submit_urb failed with result %d\n",
1218                         __func__, retval);
1219         }
1220 }
1221
1222 static void pl2303_process_read_urb(struct urb *urb)
1223 {
1224         struct usb_serial_port *port = urb->context;
1225         struct pl2303_private *priv = usb_get_serial_port_data(port);
1226         unsigned char *data = urb->transfer_buffer;
1227         char tty_flag = TTY_NORMAL;
1228         unsigned long flags;
1229         u8 line_status;
1230         int i;
1231
1232         /* update line status */
1233         spin_lock_irqsave(&priv->lock, flags);
1234         line_status = priv->line_status;
1235         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1236         spin_unlock_irqrestore(&priv->lock, flags);
1237
1238         if (!urb->actual_length)
1239                 return;
1240
1241         /*
1242          * Break takes precedence over parity, which takes precedence over
1243          * framing errors.
1244          */
1245         if (line_status & UART_BREAK_ERROR)
1246                 tty_flag = TTY_BREAK;
1247         else if (line_status & UART_PARITY_ERROR)
1248                 tty_flag = TTY_PARITY;
1249         else if (line_status & UART_FRAME_ERROR)
1250                 tty_flag = TTY_FRAME;
1251
1252         if (tty_flag != TTY_NORMAL)
1253                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1254                                                                 tty_flag);
1255         /* overrun is special, not associated with a char */
1256         if (line_status & UART_OVERRUN_ERROR)
1257                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1258
1259         if (port->sysrq) {
1260                 for (i = 0; i < urb->actual_length; ++i)
1261                         if (!usb_serial_handle_sysrq_char(port, data[i]))
1262                                 tty_insert_flip_char(&port->port, data[i],
1263                                                 tty_flag);
1264         } else {
1265                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1266                                                         urb->actual_length);
1267         }
1268
1269         tty_flip_buffer_push(&port->port);
1270 }
1271
1272 static struct usb_serial_driver pl2303_device = {
1273         .driver = {
1274                 .name =         "pl2303",
1275         },
1276         .id_table =             id_table,
1277         .num_bulk_in =          1,
1278         .num_bulk_out =         1,
1279         .num_interrupt_in =     0,      /* see pl2303_calc_num_ports */
1280         .bulk_in_size =         256,
1281         .bulk_out_size =        256,
1282         .open =                 pl2303_open,
1283         .close =                pl2303_close,
1284         .dtr_rts =              pl2303_dtr_rts,
1285         .carrier_raised =       pl2303_carrier_raised,
1286         .break_ctl =            pl2303_break_ctl,
1287         .set_termios =          pl2303_set_termios,
1288         .tiocmget =             pl2303_tiocmget,
1289         .tiocmset =             pl2303_tiocmset,
1290         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1291         .process_read_urb =     pl2303_process_read_urb,
1292         .read_int_callback =    pl2303_read_int_callback,
1293         .probe =                pl2303_probe,
1294         .calc_num_ports =       pl2303_calc_num_ports,
1295         .attach =               pl2303_startup,
1296         .release =              pl2303_release,
1297         .port_probe =           pl2303_port_probe,
1298         .port_remove =          pl2303_port_remove,
1299 };
1300
1301 static struct usb_serial_driver * const serial_drivers[] = {
1302         &pl2303_device, NULL
1303 };
1304
1305 module_usb_serial_driver(serial_drivers, id_table);
1306
1307 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1308 MODULE_LICENSE("GPL v2");