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 (greg@kroah.com) 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 linux-usb@vger.kernel.org\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"); 1309