FILE
pl2303.c
File preview with syntax highlighting.
linux-6.19.14/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 (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 36static 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 126MODULE_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 178static int pl2303_set_break(struct usb_serial_port *port, bool enable); 179 180enum 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 190struct 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 199struct pl2303_serial_private { 200 const struct pl2303_type_data *type; 201 unsigned long quirks; 202}; 203 204struct pl2303_private { 205 spinlock_t lock; 206 u8 line_control; 207 u8 line_status; 208 209 u8 line_settings[7]; 210}; 211 212static 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 244static 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 274static 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 300static 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); 322out_free: 323 kfree(buf); 324 325 return ret; 326} 327 328static 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 */ 341static 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 371static 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 392static 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 404static 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 case 0x905: /* GT-2AB */ 462 case 0x1005: /* GC-Q20 */ 463 return TYPE_HXN; 464 } 465 break; 466 } 467 468 dev_err(&serial->interface->dev, 469 "unknown device type, please report to linux-usb@vger.kernel.org\n"); 470 return -ENODEV; 471} 472 473static bool pl2303_is_hxd_clone(struct usb_serial *serial) 474{ 475 struct usb_device *udev = serial->dev; 476 unsigned char *buf; 477 int ret; 478 479 buf = kmalloc(7, GFP_KERNEL); 480 if (!buf) 481 return false; 482 483 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 484 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 485 0, 0, buf, 7, 100); 486 487 kfree(buf); 488 489 return ret == -EPIPE; 490} 491 492static int pl2303_startup(struct usb_serial *serial) 493{ 494 struct pl2303_serial_private *spriv; 495 enum pl2303_type type; 496 unsigned char *buf; 497 int ret; 498 499 ret = pl2303_detect_type(serial); 500 if (ret < 0) 501 return ret; 502 503 type = ret; 504 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name); 505 506 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 507 if (!spriv) 508 return -ENOMEM; 509 510 spriv->type = &pl2303_type_data[type]; 511 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 512 spriv->quirks |= spriv->type->quirks; 513 514 if (type == TYPE_HXD && pl2303_is_hxd_clone(serial)) 515 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE; 516 517 usb_set_serial_data(serial, spriv); 518 519 if (type != TYPE_HXN) { 520 buf = kmalloc(1, GFP_KERNEL); 521 if (!buf) { 522 kfree(spriv); 523 return -ENOMEM; 524 } 525 526 pl2303_vendor_read(serial, 0x8484, buf); 527 pl2303_vendor_write(serial, 0x0404, 0); 528 pl2303_vendor_read(serial, 0x8484, buf); 529 pl2303_vendor_read(serial, 0x8383, buf); 530 pl2303_vendor_read(serial, 0x8484, buf); 531 pl2303_vendor_write(serial, 0x0404, 1); 532 pl2303_vendor_read(serial, 0x8484, buf); 533 pl2303_vendor_read(serial, 0x8383, buf); 534 pl2303_vendor_write(serial, 0, 1); 535 pl2303_vendor_write(serial, 1, 0); 536 if (spriv->quirks & PL2303_QUIRK_LEGACY) 537 pl2303_vendor_write(serial, 2, 0x24); 538 else 539 pl2303_vendor_write(serial, 2, 0x44); 540 541 kfree(buf); 542 } 543 544 return 0; 545} 546 547static void pl2303_release(struct usb_serial *serial) 548{ 549 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 550 551 kfree(spriv); 552} 553 554static int pl2303_port_probe(struct usb_serial_port *port) 555{ 556 struct pl2303_private *priv; 557 558 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 559 if (!priv) 560 return -ENOMEM; 561 562 spin_lock_init(&priv->lock); 563 564 usb_set_serial_port_data(port, priv); 565 566 port->port.drain_delay = 256; 567 568 return 0; 569} 570 571static void pl2303_port_remove(struct usb_serial_port *port) 572{ 573 struct pl2303_private *priv = usb_get_serial_port_data(port); 574 575 kfree(priv); 576} 577 578static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 579{ 580 struct usb_device *dev = port->serial->dev; 581 int retval; 582 583 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 584 585 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 586 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 587 value, 0, NULL, 0, 100); 588 if (retval) 589 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 590 591 return retval; 592} 593 594/* 595 * Returns the nearest supported baud rate that can be set directly without 596 * using divisors. 597 */ 598static speed_t pl2303_get_supported_baud_rate(speed_t baud) 599{ 600 static const speed_t baud_sup[] = { 601 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 602 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 603 614400, 921600, 1228800, 2457600, 3000000, 6000000 604 }; 605 606 unsigned i; 607 608 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 609 if (baud_sup[i] > baud) 610 break; 611 } 612 613 if (i == ARRAY_SIZE(baud_sup)) 614 baud = baud_sup[i - 1]; 615 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 616 baud = baud_sup[i - 1]; 617 else 618 baud = baud_sup[i]; 619 620 return baud; 621} 622 623/* 624 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 625 * use 9600 baud. 626 */ 627static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 628 speed_t baud) 629{ 630 put_unaligned_le32(baud, buf); 631 632 return baud; 633} 634 635static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 636 speed_t baud) 637{ 638 unsigned int baseline, mantissa, exponent; 639 640 /* 641 * Apparently the formula is: 642 * baudrate = 12M * 32 / (mantissa * 4^exponent) 643 * where 644 * mantissa = buf[8:0] 645 * exponent = buf[11:9] 646 */ 647 baseline = 12000000 * 32; 648 mantissa = baseline / baud; 649 if (mantissa == 0) 650 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 651 exponent = 0; 652 while (mantissa >= 512) { 653 if (exponent < 7) { 654 mantissa >>= 2; /* divide by 4 */ 655 exponent++; 656 } else { 657 /* Exponent is maxed. Trim mantissa and leave. */ 658 mantissa = 511; 659 break; 660 } 661 } 662 663 buf[3] = 0x80; 664 buf[2] = 0; 665 buf[1] = exponent << 1 | mantissa >> 8; 666 buf[0] = mantissa & 0xff; 667 668 /* Calculate and return the exact baud rate. */ 669 baud = (baseline / mantissa) >> (exponent << 1); 670 671 return baud; 672} 673 674static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4], 675 speed_t baud) 676{ 677 unsigned int baseline, mantissa, exponent; 678 679 /* 680 * Apparently, for the TA version the formula is: 681 * baudrate = 12M * 32 / (mantissa * 2^exponent) 682 * where 683 * mantissa = buf[10:0] 684 * exponent = buf[15:13 16] 685 */ 686 baseline = 12000000 * 32; 687 mantissa = baseline / baud; 688 if (mantissa == 0) 689 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 690 exponent = 0; 691 while (mantissa >= 2048) { 692 if (exponent < 15) { 693 mantissa >>= 1; /* divide by 2 */ 694 exponent++; 695 } else { 696 /* Exponent is maxed. Trim mantissa and leave. */ 697 mantissa = 2047; 698 break; 699 } 700 } 701 702 buf[3] = 0x80; 703 buf[2] = exponent & 0x01; 704 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8; 705 buf[0] = mantissa & 0xff; 706 707 /* Calculate and return the exact baud rate. */ 708 baud = (baseline / mantissa) >> exponent; 709 710 return baud; 711} 712 713static void pl2303_encode_baud_rate(struct tty_struct *tty, 714 struct usb_serial_port *port, 715 u8 buf[4]) 716{ 717 struct usb_serial *serial = port->serial; 718 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 719 speed_t baud_sup; 720 speed_t baud; 721 722 baud = tty_get_baud_rate(tty); 723 dev_dbg(&port->dev, "baud requested = %u\n", baud); 724 if (!baud) 725 return; 726 727 if (spriv->type->max_baud_rate) 728 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 729 /* 730 * Use direct method for supported baud rates, otherwise use divisors. 731 * Newer chip types do not support divisor encoding. 732 */ 733 if (spriv->type->no_divisors) 734 baud_sup = baud; 735 else 736 baud_sup = pl2303_get_supported_baud_rate(baud); 737 738 if (baud == baud_sup) 739 baud = pl2303_encode_baud_rate_direct(buf, baud); 740 else if (spriv->type->alt_divisors) 741 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud); 742 else 743 baud = pl2303_encode_baud_rate_divisor(buf, baud); 744 745 /* Save resulting baud rate */ 746 tty_encode_baud_rate(tty, baud, baud); 747 dev_dbg(&port->dev, "baud set = %u\n", baud); 748} 749 750static int pl2303_get_line_request(struct usb_serial_port *port, 751 unsigned char buf[7]) 752{ 753 struct usb_serial *serial = port->serial; 754 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 755 struct usb_device *udev = serial->dev; 756 int ret; 757 758 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) { 759 struct pl2303_private *priv = usb_get_serial_port_data(port); 760 761 memcpy(buf, priv->line_settings, 7); 762 return 0; 763 } 764 765 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 766 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 767 0, 0, buf, 7, 100); 768 if (ret != 7) { 769 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 770 771 if (ret >= 0) 772 ret = -EIO; 773 774 return ret; 775 } 776 777 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 778 779 return 0; 780} 781 782static int pl2303_set_line_request(struct usb_serial_port *port, 783 unsigned char buf[7]) 784{ 785 struct usb_device *udev = port->serial->dev; 786 int ret; 787 788 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 789 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 790 0, 0, buf, 7, 100); 791 if (ret < 0) { 792 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 793 return ret; 794 } 795 796 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 797 798 return 0; 799} 800 801static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b) 802{ 803 bool ixon_change; 804 805 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) || 806 a->c_cc[VSTART] != b->c_cc[VSTART] || 807 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 808 809 return tty_termios_hw_change(a, b) || ixon_change; 810} 811 812static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type) 813{ 814 if (!I_IXON(tty) || I_IXANY(tty)) 815 return false; 816 817 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13) 818 return false; 819 820 if (type->no_autoxonxoff) 821 return false; 822 823 return true; 824} 825 826static void pl2303_set_termios(struct tty_struct *tty, 827 struct usb_serial_port *port, 828 const struct ktermios *old_termios) 829{ 830 struct usb_serial *serial = port->serial; 831 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 832 struct pl2303_private *priv = usb_get_serial_port_data(port); 833 unsigned long flags; 834 unsigned char *buf; 835 int ret; 836 u8 control; 837 838 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios)) 839 return; 840 841 buf = kzalloc(7, GFP_KERNEL); 842 if (!buf) { 843 /* Report back no change occurred */ 844 if (old_termios) 845 tty->termios = *old_termios; 846 return; 847 } 848 849 pl2303_get_line_request(port, buf); 850 851 buf[6] = tty_get_char_size(tty->termios.c_cflag); 852 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 853 854 /* For reference buf[0]:buf[3] baud rate value */ 855 pl2303_encode_baud_rate(tty, port, &buf[0]); 856 857 /* For reference buf[4]=0 is 1 stop bits */ 858 /* For reference buf[4]=1 is 1.5 stop bits */ 859 /* For reference buf[4]=2 is 2 stop bits */ 860 if (C_CSTOPB(tty)) { 861 /* 862 * NOTE: Comply with "real" UARTs / RS232: 863 * use 1.5 instead of 2 stop bits with 5 data bits 864 */ 865 if (C_CSIZE(tty) == CS5) { 866 buf[4] = 1; 867 dev_dbg(&port->dev, "stop bits = 1.5\n"); 868 } else { 869 buf[4] = 2; 870 dev_dbg(&port->dev, "stop bits = 2\n"); 871 } 872 } else { 873 buf[4] = 0; 874 dev_dbg(&port->dev, "stop bits = 1\n"); 875 } 876 877 if (C_PARENB(tty)) { 878 /* For reference buf[5]=0 is none parity */ 879 /* For reference buf[5]=1 is odd parity */ 880 /* For reference buf[5]=2 is even parity */ 881 /* For reference buf[5]=3 is mark parity */ 882 /* For reference buf[5]=4 is space parity */ 883 if (C_PARODD(tty)) { 884 if (C_CMSPAR(tty)) { 885 buf[5] = 3; 886 dev_dbg(&port->dev, "parity = mark\n"); 887 } else { 888 buf[5] = 1; 889 dev_dbg(&port->dev, "parity = odd\n"); 890 } 891 } else { 892 if (C_CMSPAR(tty)) { 893 buf[5] = 4; 894 dev_dbg(&port->dev, "parity = space\n"); 895 } else { 896 buf[5] = 2; 897 dev_dbg(&port->dev, "parity = even\n"); 898 } 899 } 900 } else { 901 buf[5] = 0; 902 dev_dbg(&port->dev, "parity = none\n"); 903 } 904 905 /* 906 * Some PL2303 are known to lose bytes if you change serial settings 907 * even to the same values as before. Thus we actually need to filter 908 * in this specific case. 909 * 910 * Note that the tty_termios_hw_change check above is not sufficient 911 * as a previously requested baud rate may differ from the one 912 * actually used (and stored in old_termios). 913 * 914 * NOTE: No additional locking needed for line_settings as it is 915 * only used in set_termios, which is serialised against itself. 916 */ 917 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 918 ret = pl2303_set_line_request(port, buf); 919 if (!ret) 920 memcpy(priv->line_settings, buf, 7); 921 } 922 923 /* change control lines if we are switching to or from B0 */ 924 spin_lock_irqsave(&priv->lock, flags); 925 control = priv->line_control; 926 if (C_BAUD(tty) == B0) 927 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 928 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 929 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 930 if (control != priv->line_control) { 931 control = priv->line_control; 932 spin_unlock_irqrestore(&priv->lock, flags); 933 pl2303_set_control_lines(port, control); 934 } else { 935 spin_unlock_irqrestore(&priv->lock, flags); 936 } 937 938 if (C_CRTSCTS(tty)) { 939 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 940 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40); 941 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 942 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 943 PL2303_HXN_FLOWCTRL_MASK, 944 PL2303_HXN_FLOWCTRL_RTS_CTS); 945 } else { 946 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60); 947 } 948 } else if (pl2303_enable_xonxoff(tty, spriv->type)) { 949 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 950 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 951 PL2303_HXN_FLOWCTRL_MASK, 952 PL2303_HXN_FLOWCTRL_XON_XOFF); 953 } else { 954 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0); 955 } 956 } else { 957 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 958 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 959 PL2303_HXN_FLOWCTRL_MASK, 960 PL2303_HXN_FLOWCTRL_NONE); 961 } else { 962 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0); 963 } 964 } 965 966 kfree(buf); 967} 968 969static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 970{ 971 struct pl2303_private *priv = usb_get_serial_port_data(port); 972 unsigned long flags; 973 u8 control; 974 975 spin_lock_irqsave(&priv->lock, flags); 976 if (on) 977 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 978 else 979 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 980 control = priv->line_control; 981 spin_unlock_irqrestore(&priv->lock, flags); 982 983 pl2303_set_control_lines(port, control); 984} 985 986static void pl2303_close(struct usb_serial_port *port) 987{ 988 usb_serial_generic_close(port); 989 usb_kill_urb(port->interrupt_in_urb); 990 pl2303_set_break(port, false); 991} 992 993static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 994{ 995 struct usb_serial *serial = port->serial; 996 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 997 int result; 998 999 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 1000 usb_clear_halt(serial->dev, port->write_urb->pipe); 1001 usb_clear_halt(serial->dev, port->read_urb->pipe); 1002 } else { 1003 /* reset upstream data pipes */ 1004 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 1005 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG, 1006 PL2303_HXN_RESET_UPSTREAM_PIPE | 1007 PL2303_HXN_RESET_DOWNSTREAM_PIPE); 1008 } else { 1009 pl2303_vendor_write(serial, 8, 0); 1010 pl2303_vendor_write(serial, 9, 0); 1011 } 1012 } 1013 1014 /* Setup termios */ 1015 if (tty) 1016 pl2303_set_termios(tty, port, NULL); 1017 1018 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1019 if (result) { 1020 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 1021 result); 1022 return result; 1023 } 1024 1025 result = usb_serial_generic_open(tty, port); 1026 if (result) { 1027 usb_kill_urb(port->interrupt_in_urb); 1028 return result; 1029 } 1030 1031 return 0; 1032} 1033 1034static int pl2303_tiocmset(struct tty_struct *tty, 1035 unsigned int set, unsigned int clear) 1036{ 1037 struct usb_serial_port *port = tty->driver_data; 1038 struct pl2303_private *priv = usb_get_serial_port_data(port); 1039 unsigned long flags; 1040 u8 control; 1041 int ret; 1042 1043 spin_lock_irqsave(&priv->lock, flags); 1044 if (set & TIOCM_RTS) 1045 priv->line_control |= CONTROL_RTS; 1046 if (set & TIOCM_DTR) 1047 priv->line_control |= CONTROL_DTR; 1048 if (clear & TIOCM_RTS) 1049 priv->line_control &= ~CONTROL_RTS; 1050 if (clear & TIOCM_DTR) 1051 priv->line_control &= ~CONTROL_DTR; 1052 control = priv->line_control; 1053 spin_unlock_irqrestore(&priv->lock, flags); 1054 1055 ret = pl2303_set_control_lines(port, control); 1056 if (ret) 1057 return usb_translate_errors(ret); 1058 1059 return 0; 1060} 1061 1062static int pl2303_tiocmget(struct tty_struct *tty) 1063{ 1064 struct usb_serial_port *port = tty->driver_data; 1065 struct pl2303_private *priv = usb_get_serial_port_data(port); 1066 unsigned long flags; 1067 unsigned int mcr; 1068 unsigned int status; 1069 unsigned int result; 1070 1071 spin_lock_irqsave(&priv->lock, flags); 1072 mcr = priv->line_control; 1073 status = priv->line_status; 1074 spin_unlock_irqrestore(&priv->lock, flags); 1075 1076 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 1077 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 1078 | ((status & UART_CTS) ? TIOCM_CTS : 0) 1079 | ((status & UART_DSR) ? TIOCM_DSR : 0) 1080 | ((status & UART_RING) ? TIOCM_RI : 0) 1081 | ((status & UART_DCD) ? TIOCM_CD : 0); 1082 1083 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 1084 1085 return result; 1086} 1087 1088static int pl2303_carrier_raised(struct usb_serial_port *port) 1089{ 1090 struct pl2303_private *priv = usb_get_serial_port_data(port); 1091 1092 if (priv->line_status & UART_DCD) 1093 return 1; 1094 1095 return 0; 1096} 1097 1098static int pl2303_set_break(struct usb_serial_port *port, bool enable) 1099{ 1100 struct usb_serial *serial = port->serial; 1101 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1102 u16 state; 1103 int result; 1104 1105 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) 1106 return -ENOTTY; 1107 1108 if (enable) 1109 state = BREAK_ON; 1110 else 1111 state = BREAK_OFF; 1112 1113 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1114 state == BREAK_OFF ? "off" : "on"); 1115 1116 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1117 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 1118 0, NULL, 0, 100); 1119 if (result) { 1120 dev_err(&port->dev, "error sending break = %d\n", result); 1121 return result; 1122 } 1123 1124 return 0; 1125} 1126 1127static int pl2303_break_ctl(struct tty_struct *tty, int state) 1128{ 1129 struct usb_serial_port *port = tty->driver_data; 1130 1131 return pl2303_set_break(port, state); 1132} 1133 1134static void pl2303_update_line_status(struct usb_serial_port *port, 1135 unsigned char *data, 1136 unsigned int actual_length) 1137{ 1138 struct usb_serial *serial = port->serial; 1139 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1140 struct pl2303_private *priv = usb_get_serial_port_data(port); 1141 struct tty_struct *tty; 1142 unsigned long flags; 1143 unsigned int status_idx = UART_STATE_INDEX; 1144 u8 status; 1145 u8 delta; 1146 1147 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 1148 status_idx = 0; 1149 1150 if (actual_length < status_idx + 1) 1151 return; 1152 1153 status = data[status_idx]; 1154 1155 /* Save off the uart status for others to look at */ 1156 spin_lock_irqsave(&priv->lock, flags); 1157 delta = priv->line_status ^ status; 1158 priv->line_status = status; 1159 spin_unlock_irqrestore(&priv->lock, flags); 1160 1161 if (status & UART_BREAK_ERROR) 1162 usb_serial_handle_break(port); 1163 1164 if (delta & UART_STATE_MSR_MASK) { 1165 if (delta & UART_CTS) 1166 port->icount.cts++; 1167 if (delta & UART_DSR) 1168 port->icount.dsr++; 1169 if (delta & UART_RING) 1170 port->icount.rng++; 1171 if (delta & UART_DCD) { 1172 port->icount.dcd++; 1173 tty = tty_port_tty_get(&port->port); 1174 if (tty) { 1175 usb_serial_handle_dcd_change(port, tty, 1176 status & UART_DCD); 1177 tty_kref_put(tty); 1178 } 1179 } 1180 1181 wake_up_interruptible(&port->port.delta_msr_wait); 1182 } 1183} 1184 1185static void pl2303_read_int_callback(struct urb *urb) 1186{ 1187 struct usb_serial_port *port = urb->context; 1188 unsigned char *data = urb->transfer_buffer; 1189 unsigned int actual_length = urb->actual_length; 1190 int status = urb->status; 1191 int retval; 1192 1193 switch (status) { 1194 case 0: 1195 /* success */ 1196 break; 1197 case -ECONNRESET: 1198 case -ENOENT: 1199 case -ESHUTDOWN: 1200 /* this urb is terminated, clean up */ 1201 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 1202 __func__, status); 1203 return; 1204 default: 1205 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 1206 __func__, status); 1207 goto exit; 1208 } 1209 1210 usb_serial_debug_data(&port->dev, __func__, 1211 urb->actual_length, urb->transfer_buffer); 1212 1213 pl2303_update_line_status(port, data, actual_length); 1214 1215exit: 1216 retval = usb_submit_urb(urb, GFP_ATOMIC); 1217 if (retval) { 1218 dev_err(&port->dev, 1219 "%s - usb_submit_urb failed with result %d\n", 1220 __func__, retval); 1221 } 1222} 1223 1224static void pl2303_process_read_urb(struct urb *urb) 1225{ 1226 struct usb_serial_port *port = urb->context; 1227 struct pl2303_private *priv = usb_get_serial_port_data(port); 1228 unsigned char *data = urb->transfer_buffer; 1229 char tty_flag = TTY_NORMAL; 1230 unsigned long flags; 1231 u8 line_status; 1232 int i; 1233 1234 /* update line status */ 1235 spin_lock_irqsave(&priv->lock, flags); 1236 line_status = priv->line_status; 1237 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 1238 spin_unlock_irqrestore(&priv->lock, flags); 1239 1240 if (!urb->actual_length) 1241 return; 1242 1243 /* 1244 * Break takes precedence over parity, which takes precedence over 1245 * framing errors. 1246 */ 1247 if (line_status & UART_BREAK_ERROR) 1248 tty_flag = TTY_BREAK; 1249 else if (line_status & UART_PARITY_ERROR) 1250 tty_flag = TTY_PARITY; 1251 else if (line_status & UART_FRAME_ERROR) 1252 tty_flag = TTY_FRAME; 1253 1254 if (tty_flag != TTY_NORMAL) 1255 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 1256 tty_flag); 1257 /* overrun is special, not associated with a char */ 1258 if (line_status & UART_OVERRUN_ERROR) 1259 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 1260 1261 if (port->sysrq) { 1262 for (i = 0; i < urb->actual_length; ++i) 1263 if (!usb_serial_handle_sysrq_char(port, data[i])) 1264 tty_insert_flip_char(&port->port, data[i], 1265 tty_flag); 1266 } else { 1267 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 1268 urb->actual_length); 1269 } 1270 1271 tty_flip_buffer_push(&port->port); 1272} 1273 1274static struct usb_serial_driver pl2303_device = { 1275 .driver = { 1276 .name = "pl2303", 1277 }, 1278 .id_table = id_table, 1279 .num_bulk_in = 1, 1280 .num_bulk_out = 1, 1281 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */ 1282 .bulk_in_size = 256, 1283 .bulk_out_size = 256, 1284 .open = pl2303_open, 1285 .close = pl2303_close, 1286 .dtr_rts = pl2303_dtr_rts, 1287 .carrier_raised = pl2303_carrier_raised, 1288 .break_ctl = pl2303_break_ctl, 1289 .set_termios = pl2303_set_termios, 1290 .tiocmget = pl2303_tiocmget, 1291 .tiocmset = pl2303_tiocmset, 1292 .tiocmiwait = usb_serial_generic_tiocmiwait, 1293 .process_read_urb = pl2303_process_read_urb, 1294 .read_int_callback = pl2303_read_int_callback, 1295 .probe = pl2303_probe, 1296 .calc_num_ports = pl2303_calc_num_ports, 1297 .attach = pl2303_startup, 1298 .release = pl2303_release, 1299 .port_probe = pl2303_port_probe, 1300 .port_remove = pl2303_port_remove, 1301}; 1302 1303static struct usb_serial_driver * const serial_drivers[] = { 1304 &pl2303_device, NULL 1305}; 1306 1307module_usb_serial_driver(serial_drivers, id_table); 1308 1309MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 1310MODULE_LICENSE("GPL v2");
~/
Read-only file preview.