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_flip.h> 19 #include <linux/serial.h> 20 #include <linux/module.h> 21 #include <linux/spinlock.h> 22 #include <linux/usb.h> 23 #include <linux/usb/serial.h> 24 #include <linux/unaligned.h> 25 #include "pl2303.h" 26 27 28 #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0) 29 #define PL2303_QUIRK_LEGACY BIT(1) 30 #define PL2303_QUIRK_ENDPOINT_HACK BIT(2) 31 #define PL2303_QUIRK_NO_BREAK_GETLINE BIT(3) 32 33 static const struct usb_device_id id_table[] = { 34 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID), 35 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 36 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) }, 37 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) }, 38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) }, 39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) }, 40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) }, 41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) }, 42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) }, 43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) }, 44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) }, 45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) }, 46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) }, 47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) }, 48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) }, 49 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) }, 50 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) }, 51 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) }, 52 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) }, 53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) }, 54 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, 55 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, 56 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID), 57 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 58 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485), 59 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 60 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B), 61 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 62 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) }, 63 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, 64 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, 65 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, 66 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, 67 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, 68 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, 69 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, 70 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, 71 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, 72 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, 73 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, 74 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, 75 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1), 76 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 77 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65), 78 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 79 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75), 80 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 81 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81), 82 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 83 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */ 84 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) }, 85 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) }, 86 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) }, 87 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) }, 88 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) }, 89 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) }, 90 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) }, 91 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) }, 92 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID), 93 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 94 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) }, 95 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) }, 96 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) }, 97 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) }, 98 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) }, 99 { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) }, 100 { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) }, 101 { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) }, 102 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) }, 103 { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) }, 104 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) }, 105 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) }, 106 { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) }, 107 { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) }, 108 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) }, 109 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) }, 110 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, 111 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, 112 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, 113 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, 114 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, 115 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) }, 116 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, 117 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) }, 118 { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) }, 119 { USB_DEVICE(MACROSILICON_VENDOR_ID, MACROSILICON_MS3020_PRODUCT_ID) }, 120 { } /* Terminating entry */ 121 }; 122 123 MODULE_DEVICE_TABLE(usb, id_table); 124 125 #define SET_LINE_REQUEST_TYPE 0x21 126 #define SET_LINE_REQUEST 0x20 127 128 #define SET_CONTROL_REQUEST_TYPE 0x21 129 #define SET_CONTROL_REQUEST 0x22 130 #define CONTROL_DTR 0x01 131 #define CONTROL_RTS 0x02 132 133 #define BREAK_REQUEST_TYPE 0x21 134 #define BREAK_REQUEST 0x23 135 #define BREAK_ON 0xffff 136 #define BREAK_OFF 0x0000 137 138 #define GET_LINE_REQUEST_TYPE 0xa1 139 #define GET_LINE_REQUEST 0x21 140 141 #define VENDOR_WRITE_REQUEST_TYPE 0x40 142 #define VENDOR_WRITE_REQUEST 0x01 143 #define VENDOR_WRITE_NREQUEST 0x80 144 145 #define VENDOR_READ_REQUEST_TYPE 0xc0 146 #define VENDOR_READ_REQUEST 0x01 147 #define VENDOR_READ_NREQUEST 0x81 148 149 #define UART_STATE_INDEX 8 150 #define UART_STATE_MSR_MASK 0x8b 151 #define UART_STATE_TRANSIENT_MASK 0x74 152 #define UART_DCD 0x01 153 #define UART_DSR 0x02 154 #define UART_BREAK_ERROR 0x04 155 #define UART_RING 0x08 156 #define UART_FRAME_ERROR 0x10 157 #define UART_PARITY_ERROR 0x20 158 #define UART_OVERRUN_ERROR 0x40 159 #define UART_CTS 0x80 160 161 #define PL2303_FLOWCTRL_MASK 0xf0 162 163 #define PL2303_READ_TYPE_HX_STATUS 0x8080 164 165 #define PL2303_HXN_RESET_REG 0x07 166 #define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02 167 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01 168 169 #define PL2303_HXN_FLOWCTRL_REG 0x0a 170 #define PL2303_HXN_FLOWCTRL_MASK 0x1c 171 #define PL2303_HXN_FLOWCTRL_NONE 0x1c 172 #define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18 173 #define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c 174 175 static int pl2303_set_break(struct usb_serial_port *port, bool enable); 176 177 enum pl2303_type { 178 TYPE_H, 179 TYPE_HX, 180 TYPE_TA, 181 TYPE_TB, 182 TYPE_HXD, 183 TYPE_HXN, 184 TYPE_COUNT 185 }; 186 187 struct pl2303_type_data { 188 const char *name; 189 speed_t max_baud_rate; 190 unsigned long quirks; 191 unsigned int no_autoxonxoff:1; 192 unsigned int no_divisors:1; 193 unsigned int alt_divisors:1; 194 }; 195 196 struct pl2303_serial_private { 197 const struct pl2303_type_data *type; 198 unsigned long quirks; 199 }; 200 201 struct pl2303_private { 202 spinlock_t lock; 203 u8 line_control; 204 u8 line_status; 205 206 u8 line_settings[7]; 207 }; 208 209 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 210 [TYPE_H] = { 211 .name = "H", 212 .max_baud_rate = 1228800, 213 .quirks = PL2303_QUIRK_LEGACY, 214 .no_autoxonxoff = true, 215 }, 216 [TYPE_HX] = { 217 .name = "HX", 218 .max_baud_rate = 6000000, 219 }, 220 [TYPE_TA] = { 221 .name = "TA", 222 .max_baud_rate = 6000000, 223 .alt_divisors = true, 224 }, 225 [TYPE_TB] = { 226 .name = "TB", 227 .max_baud_rate = 12000000, 228 .alt_divisors = true, 229 }, 230 [TYPE_HXD] = { 231 .name = "HXD", 232 .max_baud_rate = 12000000, 233 }, 234 [TYPE_HXN] = { 235 .name = "G", 236 .max_baud_rate = 12000000, 237 .no_divisors = true, 238 }, 239 }; 240 241 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 242 unsigned char buf[1]) 243 { 244 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 245 struct device *dev = &serial->interface->dev; 246 u8 request; 247 int res; 248 249 if (spriv->type == &pl2303_type_data[TYPE_HXN]) 250 request = VENDOR_READ_NREQUEST; 251 else 252 request = VENDOR_READ_REQUEST; 253 254 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 255 request, VENDOR_READ_REQUEST_TYPE, 256 value, 0, buf, 1, 100); 257 if (res != 1) { 258 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 259 value, res); 260 if (res >= 0) 261 res = -EIO; 262 263 return res; 264 } 265 266 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 267 268 return 0; 269 } 270 271 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 272 { 273 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 274 struct device *dev = &serial->interface->dev; 275 u8 request; 276 int res; 277 278 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 279 280 if (spriv->type == &pl2303_type_data[TYPE_HXN]) 281 request = VENDOR_WRITE_NREQUEST; 282 else 283 request = VENDOR_WRITE_REQUEST; 284 285 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 286 request, VENDOR_WRITE_REQUEST_TYPE, 287 value, index, NULL, 0, 100); 288 if (res) { 289 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 290 value, res); 291 return res; 292 } 293 294 return 0; 295 } 296 297 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val) 298 { 299 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 300 int ret = 0; 301 u8 *buf; 302 303 buf = kmalloc(1, GFP_KERNEL); 304 if (!buf) 305 return -ENOMEM; 306 307 if (spriv->type == &pl2303_type_data[TYPE_HXN]) 308 ret = pl2303_vendor_read(serial, reg, buf); 309 else 310 ret = pl2303_vendor_read(serial, reg | 0x80, buf); 311 312 if (ret) 313 goto out_free; 314 315 *buf &= ~mask; 316 *buf |= val & mask; 317 318 ret = pl2303_vendor_write(serial, reg, *buf); 319 out_free: 320 kfree(buf); 321 322 return ret; 323 } 324 325 static int pl2303_probe(struct usb_serial *serial, 326 const struct usb_device_id *id) 327 { 328 usb_set_serial_data(serial, (void *)id->driver_info); 329 330 return 0; 331 } 332 333 /* 334 * Use interrupt endpoint from first interface if available. 335 * 336 * This is needed due to the looney way its endpoints are set up. 337 */ 338 static int pl2303_endpoint_hack(struct usb_serial *serial, 339 struct usb_serial_endpoints *epds) 340 { 341 struct usb_interface *interface = serial->interface; 342 struct usb_device *dev = serial->dev; 343 struct device *ddev = &interface->dev; 344 struct usb_host_interface *iface_desc; 345 struct usb_endpoint_descriptor *endpoint; 346 unsigned int i; 347 348 if (interface == dev->actconfig->interface[0]) 349 return 0; 350 351 /* check out the endpoints of the other interface */ 352 iface_desc = dev->actconfig->interface[0]->cur_altsetting; 353 354 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 355 endpoint = &iface_desc->endpoint[i].desc; 356 357 if (!usb_endpoint_is_int_in(endpoint)) 358 continue; 359 360 dev_dbg(ddev, "found interrupt in on separate interface\n"); 361 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in)) 362 epds->interrupt_in[epds->num_interrupt_in++] = endpoint; 363 } 364 365 return 0; 366 } 367 368 static int pl2303_calc_num_ports(struct usb_serial *serial, 369 struct usb_serial_endpoints *epds) 370 { 371 unsigned long quirks = (unsigned long)usb_get_serial_data(serial); 372 struct device *dev = &serial->interface->dev; 373 int ret; 374 375 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) { 376 ret = pl2303_endpoint_hack(serial, epds); 377 if (ret) 378 return ret; 379 } 380 381 if (epds->num_interrupt_in < 1) { 382 dev_err(dev, "required interrupt-in endpoint missing\n"); 383 return -ENODEV; 384 } 385 386 return 1; 387 } 388 389 static bool pl2303_supports_hx_status(struct usb_serial *serial) 390 { 391 int ret; 392 u8 buf; 393 394 ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST, 395 VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS, 396 0, &buf, 1, 100, GFP_KERNEL); 397 398 return ret == 0; 399 } 400 401 static int pl2303_detect_type(struct usb_serial *serial) 402 { 403 struct usb_device_descriptor *desc = &serial->dev->descriptor; 404 u16 bcdDevice, bcdUSB; 405 406 /* 407 * Legacy PL2303H, variants 0 and 1 (difference unknown). 408 */ 409 if (desc->bDeviceClass == 0x02) 410 return TYPE_H; /* variant 0 */ 411 412 if (desc->bMaxPacketSize0 != 0x40) { 413 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff) 414 return TYPE_H; /* variant 1 */ 415 416 return TYPE_H; /* variant 0 */ 417 } 418 419 bcdDevice = le16_to_cpu(desc->bcdDevice); 420 bcdUSB = le16_to_cpu(desc->bcdUSB); 421 422 switch (bcdUSB) { 423 case 0x101: 424 /* USB 1.0.1? Let's assume they meant 1.1... */ 425 fallthrough; 426 case 0x110: 427 switch (bcdDevice) { 428 case 0x300: 429 return TYPE_HX; 430 case 0x400: 431 return TYPE_HXD; 432 default: 433 return TYPE_HX; 434 } 435 break; 436 case 0x200: 437 switch (bcdDevice) { 438 case 0x100: /* GC */ 439 case 0x105: 440 return TYPE_HXN; 441 case 0x300: /* GT / TA */ 442 if (pl2303_supports_hx_status(serial)) 443 return TYPE_TA; 444 fallthrough; 445 case 0x305: 446 case 0x400: /* GL */ 447 case 0x405: 448 return TYPE_HXN; 449 case 0x500: /* GE / TB */ 450 if (pl2303_supports_hx_status(serial)) 451 return TYPE_TB; 452 fallthrough; 453 case 0x505: 454 case 0x600: /* GS */ 455 case 0x605: 456 case 0x700: /* GR */ 457 case 0x705: 458 case 0x905: /* GT-2AB */ 459 case 0x1005: /* GC-Q20 */ 460 return TYPE_HXN; 461 } 462 break; 463 } 464 465 dev_err(&serial->interface->dev, 466 "unknown device type, please report to linux-usb@vger.kernel.org\n"); 467 return -ENODEV; 468 } 469 470 static bool pl2303_is_hxd_clone(struct usb_serial *serial) 471 { 472 struct usb_device *udev = serial->dev; 473 unsigned char *buf; 474 int ret; 475 476 buf = kmalloc(7, GFP_KERNEL); 477 if (!buf) 478 return false; 479 480 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 481 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 482 0, 0, buf, 7, 100); 483 484 kfree(buf); 485 486 return ret == -EPIPE; 487 } 488 489 static int pl2303_startup(struct usb_serial *serial) 490 { 491 struct pl2303_serial_private *spriv; 492 enum pl2303_type type; 493 unsigned char *buf; 494 int ret; 495 496 ret = pl2303_detect_type(serial); 497 if (ret < 0) 498 return ret; 499 500 type = ret; 501 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name); 502 503 spriv = kzalloc_obj(*spriv); 504 if (!spriv) 505 return -ENOMEM; 506 507 spriv->type = &pl2303_type_data[type]; 508 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 509 spriv->quirks |= spriv->type->quirks; 510 511 if (type == TYPE_HXD && pl2303_is_hxd_clone(serial)) 512 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE; 513 514 usb_set_serial_data(serial, spriv); 515 516 if (type != TYPE_HXN) { 517 buf = kmalloc(1, GFP_KERNEL); 518 if (!buf) { 519 kfree(spriv); 520 return -ENOMEM; 521 } 522 523 pl2303_vendor_read(serial, 0x8484, buf); 524 pl2303_vendor_write(serial, 0x0404, 0); 525 pl2303_vendor_read(serial, 0x8484, buf); 526 pl2303_vendor_read(serial, 0x8383, buf); 527 pl2303_vendor_read(serial, 0x8484, buf); 528 pl2303_vendor_write(serial, 0x0404, 1); 529 pl2303_vendor_read(serial, 0x8484, buf); 530 pl2303_vendor_read(serial, 0x8383, buf); 531 pl2303_vendor_write(serial, 0, 1); 532 pl2303_vendor_write(serial, 1, 0); 533 if (spriv->quirks & PL2303_QUIRK_LEGACY) 534 pl2303_vendor_write(serial, 2, 0x24); 535 else 536 pl2303_vendor_write(serial, 2, 0x44); 537 538 kfree(buf); 539 } 540 541 return 0; 542 } 543 544 static void pl2303_release(struct usb_serial *serial) 545 { 546 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 547 548 kfree(spriv); 549 } 550 551 static int pl2303_port_probe(struct usb_serial_port *port) 552 { 553 struct pl2303_private *priv; 554 555 priv = kzalloc_obj(*priv); 556 if (!priv) 557 return -ENOMEM; 558 559 spin_lock_init(&priv->lock); 560 561 usb_set_serial_port_data(port, priv); 562 563 port->port.drain_delay = 256; 564 565 return 0; 566 } 567 568 static void pl2303_port_remove(struct usb_serial_port *port) 569 { 570 struct pl2303_private *priv = usb_get_serial_port_data(port); 571 572 kfree(priv); 573 } 574 575 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 576 { 577 struct usb_device *dev = port->serial->dev; 578 int retval; 579 580 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 581 582 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 583 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 584 value, 0, NULL, 0, 100); 585 if (retval) 586 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 587 588 return retval; 589 } 590 591 /* 592 * Returns the nearest supported baud rate that can be set directly without 593 * using divisors. 594 */ 595 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 596 { 597 static const speed_t baud_sup[] = { 598 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 599 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 600 614400, 921600, 1228800, 2457600, 3000000, 6000000 601 }; 602 603 unsigned i; 604 605 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 606 if (baud_sup[i] > baud) 607 break; 608 } 609 610 if (i == ARRAY_SIZE(baud_sup)) 611 baud = baud_sup[i - 1]; 612 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 613 baud = baud_sup[i - 1]; 614 else 615 baud = baud_sup[i]; 616 617 return baud; 618 } 619 620 /* 621 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 622 * use 9600 baud. 623 */ 624 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 625 speed_t baud) 626 { 627 put_unaligned_le32(baud, buf); 628 629 return baud; 630 } 631 632 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 633 speed_t baud) 634 { 635 unsigned int baseline, mantissa, exponent; 636 637 /* 638 * Apparently the formula is: 639 * baudrate = 12M * 32 / (mantissa * 4^exponent) 640 * where 641 * mantissa = buf[8:0] 642 * exponent = buf[11:9] 643 */ 644 baseline = 12000000 * 32; 645 mantissa = baseline / baud; 646 if (mantissa == 0) 647 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 648 exponent = 0; 649 while (mantissa >= 512) { 650 if (exponent < 7) { 651 mantissa >>= 2; /* divide by 4 */ 652 exponent++; 653 } else { 654 /* Exponent is maxed. Trim mantissa and leave. */ 655 mantissa = 511; 656 break; 657 } 658 } 659 660 buf[3] = 0x80; 661 buf[2] = 0; 662 buf[1] = exponent << 1 | mantissa >> 8; 663 buf[0] = mantissa & 0xff; 664 665 /* Calculate and return the exact baud rate. */ 666 baud = (baseline / mantissa) >> (exponent << 1); 667 668 return baud; 669 } 670 671 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4], 672 speed_t baud) 673 { 674 unsigned int baseline, mantissa, exponent; 675 676 /* 677 * Apparently, for the TA version the formula is: 678 * baudrate = 12M * 32 / (mantissa * 2^exponent) 679 * where 680 * mantissa = buf[10:0] 681 * exponent = buf[15:13 16] 682 */ 683 baseline = 12000000 * 32; 684 mantissa = baseline / baud; 685 if (mantissa == 0) 686 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 687 exponent = 0; 688 while (mantissa >= 2048) { 689 if (exponent < 15) { 690 mantissa >>= 1; /* divide by 2 */ 691 exponent++; 692 } else { 693 /* Exponent is maxed. Trim mantissa and leave. */ 694 mantissa = 2047; 695 break; 696 } 697 } 698 699 buf[3] = 0x80; 700 buf[2] = exponent & 0x01; 701 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8; 702 buf[0] = mantissa & 0xff; 703 704 /* Calculate and return the exact baud rate. */ 705 baud = (baseline / mantissa) >> exponent; 706 707 return baud; 708 } 709 710 static void pl2303_encode_baud_rate(struct tty_struct *tty, 711 struct usb_serial_port *port, 712 u8 buf[4]) 713 { 714 struct usb_serial *serial = port->serial; 715 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 716 speed_t baud_sup; 717 speed_t baud; 718 719 baud = tty_get_baud_rate(tty); 720 dev_dbg(&port->dev, "baud requested = %u\n", baud); 721 if (!baud) 722 return; 723 724 if (spriv->type->max_baud_rate) 725 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 726 /* 727 * Use direct method for supported baud rates, otherwise use divisors. 728 * Newer chip types do not support divisor encoding. 729 */ 730 if (spriv->type->no_divisors) 731 baud_sup = baud; 732 else 733 baud_sup = pl2303_get_supported_baud_rate(baud); 734 735 if (baud == baud_sup) 736 baud = pl2303_encode_baud_rate_direct(buf, baud); 737 else if (spriv->type->alt_divisors) 738 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud); 739 else 740 baud = pl2303_encode_baud_rate_divisor(buf, baud); 741 742 /* Save resulting baud rate */ 743 tty_encode_baud_rate(tty, baud, baud); 744 dev_dbg(&port->dev, "baud set = %u\n", baud); 745 } 746 747 static int pl2303_get_line_request(struct usb_serial_port *port, 748 unsigned char buf[7]) 749 { 750 struct usb_serial *serial = port->serial; 751 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 752 struct usb_device *udev = serial->dev; 753 int ret; 754 755 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) { 756 struct pl2303_private *priv = usb_get_serial_port_data(port); 757 758 memcpy(buf, priv->line_settings, 7); 759 return 0; 760 } 761 762 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 763 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 764 0, 0, buf, 7, 100); 765 if (ret != 7) { 766 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 767 768 if (ret >= 0) 769 ret = -EIO; 770 771 return ret; 772 } 773 774 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 775 776 return 0; 777 } 778 779 static int pl2303_set_line_request(struct usb_serial_port *port, 780 unsigned char buf[7]) 781 { 782 struct usb_device *udev = port->serial->dev; 783 int ret; 784 785 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 786 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 787 0, 0, buf, 7, 100); 788 if (ret < 0) { 789 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 790 return ret; 791 } 792 793 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 794 795 return 0; 796 } 797 798 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b) 799 { 800 bool ixon_change; 801 802 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) || 803 a->c_cc[VSTART] != b->c_cc[VSTART] || 804 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 805 806 return tty_termios_hw_change(a, b) || ixon_change; 807 } 808 809 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type) 810 { 811 if (!I_IXON(tty) || I_IXANY(tty)) 812 return false; 813 814 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13) 815 return false; 816 817 if (type->no_autoxonxoff) 818 return false; 819 820 return true; 821 } 822 823 static void pl2303_set_termios(struct tty_struct *tty, 824 struct usb_serial_port *port, 825 const struct ktermios *old_termios) 826 { 827 struct usb_serial *serial = port->serial; 828 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 829 struct pl2303_private *priv = usb_get_serial_port_data(port); 830 unsigned long flags; 831 unsigned char *buf; 832 int ret; 833 u8 control; 834 835 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios)) 836 return; 837 838 buf = kzalloc(7, GFP_KERNEL); 839 if (!buf) { 840 /* Report back no change occurred */ 841 if (old_termios) 842 tty->termios = *old_termios; 843 return; 844 } 845 846 pl2303_get_line_request(port, buf); 847 848 buf[6] = tty_get_char_size(tty->termios.c_cflag); 849 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 850 851 /* For reference buf[0]:buf[3] baud rate value */ 852 pl2303_encode_baud_rate(tty, port, &buf[0]); 853 854 /* For reference buf[4]=0 is 1 stop bits */ 855 /* For reference buf[4]=1 is 1.5 stop bits */ 856 /* For reference buf[4]=2 is 2 stop bits */ 857 if (C_CSTOPB(tty)) { 858 /* 859 * NOTE: Comply with "real" UARTs / RS232: 860 * use 1.5 instead of 2 stop bits with 5 data bits 861 */ 862 if (C_CSIZE(tty) == CS5) { 863 buf[4] = 1; 864 dev_dbg(&port->dev, "stop bits = 1.5\n"); 865 } else { 866 buf[4] = 2; 867 dev_dbg(&port->dev, "stop bits = 2\n"); 868 } 869 } else { 870 buf[4] = 0; 871 dev_dbg(&port->dev, "stop bits = 1\n"); 872 } 873 874 if (C_PARENB(tty)) { 875 /* For reference buf[5]=0 is none parity */ 876 /* For reference buf[5]=1 is odd parity */ 877 /* For reference buf[5]=2 is even parity */ 878 /* For reference buf[5]=3 is mark parity */ 879 /* For reference buf[5]=4 is space parity */ 880 if (C_PARODD(tty)) { 881 if (C_CMSPAR(tty)) { 882 buf[5] = 3; 883 dev_dbg(&port->dev, "parity = mark\n"); 884 } else { 885 buf[5] = 1; 886 dev_dbg(&port->dev, "parity = odd\n"); 887 } 888 } else { 889 if (C_CMSPAR(tty)) { 890 buf[5] = 4; 891 dev_dbg(&port->dev, "parity = space\n"); 892 } else { 893 buf[5] = 2; 894 dev_dbg(&port->dev, "parity = even\n"); 895 } 896 } 897 } else { 898 buf[5] = 0; 899 dev_dbg(&port->dev, "parity = none\n"); 900 } 901 902 /* 903 * Some PL2303 are known to lose bytes if you change serial settings 904 * even to the same values as before. Thus we actually need to filter 905 * in this specific case. 906 * 907 * Note that the tty_termios_hw_change check above is not sufficient 908 * as a previously requested baud rate may differ from the one 909 * actually used (and stored in old_termios). 910 * 911 * NOTE: No additional locking needed for line_settings as it is 912 * only used in set_termios, which is serialised against itself. 913 */ 914 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 915 ret = pl2303_set_line_request(port, buf); 916 if (!ret) 917 memcpy(priv->line_settings, buf, 7); 918 } 919 920 /* change control lines if we are switching to or from B0 */ 921 spin_lock_irqsave(&priv->lock, flags); 922 control = priv->line_control; 923 if (C_BAUD(tty) == B0) 924 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 925 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 926 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 927 if (control != priv->line_control) { 928 control = priv->line_control; 929 spin_unlock_irqrestore(&priv->lock, flags); 930 pl2303_set_control_lines(port, control); 931 } else { 932 spin_unlock_irqrestore(&priv->lock, flags); 933 } 934 935 if (C_CRTSCTS(tty)) { 936 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 937 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40); 938 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 939 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 940 PL2303_HXN_FLOWCTRL_MASK, 941 PL2303_HXN_FLOWCTRL_RTS_CTS); 942 } else { 943 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60); 944 } 945 } else if (pl2303_enable_xonxoff(tty, spriv->type)) { 946 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 947 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 948 PL2303_HXN_FLOWCTRL_MASK, 949 PL2303_HXN_FLOWCTRL_XON_XOFF); 950 } else { 951 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0); 952 } 953 } else { 954 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 955 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 956 PL2303_HXN_FLOWCTRL_MASK, 957 PL2303_HXN_FLOWCTRL_NONE); 958 } else { 959 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0); 960 } 961 } 962 963 kfree(buf); 964 } 965 966 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 967 { 968 struct pl2303_private *priv = usb_get_serial_port_data(port); 969 unsigned long flags; 970 u8 control; 971 972 spin_lock_irqsave(&priv->lock, flags); 973 if (on) 974 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 975 else 976 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 977 control = priv->line_control; 978 spin_unlock_irqrestore(&priv->lock, flags); 979 980 pl2303_set_control_lines(port, control); 981 } 982 983 static void pl2303_close(struct usb_serial_port *port) 984 { 985 usb_serial_generic_close(port); 986 usb_kill_urb(port->interrupt_in_urb); 987 pl2303_set_break(port, false); 988 } 989 990 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 991 { 992 struct usb_serial *serial = port->serial; 993 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 994 int result; 995 996 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 997 usb_clear_halt(serial->dev, port->write_urb->pipe); 998 usb_clear_halt(serial->dev, port->read_urb->pipe); 999 } else { 1000 /* reset upstream data pipes */ 1001 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 1002 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG, 1003 PL2303_HXN_RESET_UPSTREAM_PIPE | 1004 PL2303_HXN_RESET_DOWNSTREAM_PIPE); 1005 } else { 1006 pl2303_vendor_write(serial, 8, 0); 1007 pl2303_vendor_write(serial, 9, 0); 1008 } 1009 } 1010 1011 /* Setup termios */ 1012 if (tty) 1013 pl2303_set_termios(tty, port, NULL); 1014 1015 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1016 if (result) { 1017 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 1018 result); 1019 return result; 1020 } 1021 1022 result = usb_serial_generic_open(tty, port); 1023 if (result) { 1024 usb_kill_urb(port->interrupt_in_urb); 1025 return result; 1026 } 1027 1028 return 0; 1029 } 1030 1031 static int pl2303_tiocmset(struct tty_struct *tty, 1032 unsigned int set, unsigned int clear) 1033 { 1034 struct usb_serial_port *port = tty->driver_data; 1035 struct pl2303_private *priv = usb_get_serial_port_data(port); 1036 unsigned long flags; 1037 u8 control; 1038 int ret; 1039 1040 spin_lock_irqsave(&priv->lock, flags); 1041 if (set & TIOCM_RTS) 1042 priv->line_control |= CONTROL_RTS; 1043 if (set & TIOCM_DTR) 1044 priv->line_control |= CONTROL_DTR; 1045 if (clear & TIOCM_RTS) 1046 priv->line_control &= ~CONTROL_RTS; 1047 if (clear & TIOCM_DTR) 1048 priv->line_control &= ~CONTROL_DTR; 1049 control = priv->line_control; 1050 spin_unlock_irqrestore(&priv->lock, flags); 1051 1052 ret = pl2303_set_control_lines(port, control); 1053 if (ret) 1054 return usb_translate_errors(ret); 1055 1056 return 0; 1057 } 1058 1059 static int pl2303_tiocmget(struct tty_struct *tty) 1060 { 1061 struct usb_serial_port *port = tty->driver_data; 1062 struct pl2303_private *priv = usb_get_serial_port_data(port); 1063 unsigned long flags; 1064 unsigned int mcr; 1065 unsigned int status; 1066 unsigned int result; 1067 1068 spin_lock_irqsave(&priv->lock, flags); 1069 mcr = priv->line_control; 1070 status = priv->line_status; 1071 spin_unlock_irqrestore(&priv->lock, flags); 1072 1073 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 1074 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 1075 | ((status & UART_CTS) ? TIOCM_CTS : 0) 1076 | ((status & UART_DSR) ? TIOCM_DSR : 0) 1077 | ((status & UART_RING) ? TIOCM_RI : 0) 1078 | ((status & UART_DCD) ? TIOCM_CD : 0); 1079 1080 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 1081 1082 return result; 1083 } 1084 1085 static int pl2303_carrier_raised(struct usb_serial_port *port) 1086 { 1087 struct pl2303_private *priv = usb_get_serial_port_data(port); 1088 1089 if (priv->line_status & UART_DCD) 1090 return 1; 1091 1092 return 0; 1093 } 1094 1095 static int pl2303_set_break(struct usb_serial_port *port, bool enable) 1096 { 1097 struct usb_serial *serial = port->serial; 1098 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1099 u16 state; 1100 int result; 1101 1102 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) 1103 return -ENOTTY; 1104 1105 if (enable) 1106 state = BREAK_ON; 1107 else 1108 state = BREAK_OFF; 1109 1110 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1111 state == BREAK_OFF ? "off" : "on"); 1112 1113 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1114 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 1115 0, NULL, 0, 100); 1116 if (result) { 1117 dev_err(&port->dev, "error sending break = %d\n", result); 1118 return result; 1119 } 1120 1121 return 0; 1122 } 1123 1124 static int pl2303_break_ctl(struct tty_struct *tty, int state) 1125 { 1126 struct usb_serial_port *port = tty->driver_data; 1127 1128 return pl2303_set_break(port, state); 1129 } 1130 1131 static void pl2303_update_line_status(struct usb_serial_port *port, 1132 unsigned char *data, 1133 unsigned int actual_length) 1134 { 1135 struct usb_serial *serial = port->serial; 1136 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1137 struct pl2303_private *priv = usb_get_serial_port_data(port); 1138 struct tty_struct *tty; 1139 unsigned long flags; 1140 unsigned int status_idx = UART_STATE_INDEX; 1141 u8 status; 1142 u8 delta; 1143 1144 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 1145 status_idx = 0; 1146 1147 if (actual_length < status_idx + 1) 1148 return; 1149 1150 status = data[status_idx]; 1151 1152 /* Save off the uart status for others to look at */ 1153 spin_lock_irqsave(&priv->lock, flags); 1154 delta = priv->line_status ^ status; 1155 priv->line_status = status; 1156 spin_unlock_irqrestore(&priv->lock, flags); 1157 1158 if (status & UART_BREAK_ERROR) 1159 usb_serial_handle_break(port); 1160 1161 if (delta & UART_STATE_MSR_MASK) { 1162 if (delta & UART_CTS) 1163 port->icount.cts++; 1164 if (delta & UART_DSR) 1165 port->icount.dsr++; 1166 if (delta & UART_RING) 1167 port->icount.rng++; 1168 if (delta & UART_DCD) { 1169 port->icount.dcd++; 1170 tty = tty_port_tty_get(&port->port); 1171 if (tty) { 1172 usb_serial_handle_dcd_change(port, tty, 1173 status & UART_DCD); 1174 tty_kref_put(tty); 1175 } 1176 } 1177 1178 wake_up_interruptible(&port->port.delta_msr_wait); 1179 } 1180 } 1181 1182 static void pl2303_read_int_callback(struct urb *urb) 1183 { 1184 struct usb_serial_port *port = urb->context; 1185 unsigned char *data = urb->transfer_buffer; 1186 unsigned int actual_length = urb->actual_length; 1187 int status = urb->status; 1188 int retval; 1189 1190 switch (status) { 1191 case 0: 1192 /* success */ 1193 break; 1194 case -ECONNRESET: 1195 case -ENOENT: 1196 case -ESHUTDOWN: 1197 /* this urb is terminated, clean up */ 1198 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 1199 __func__, status); 1200 return; 1201 default: 1202 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 1203 __func__, status); 1204 goto exit; 1205 } 1206 1207 usb_serial_debug_data(&port->dev, __func__, 1208 urb->actual_length, urb->transfer_buffer); 1209 1210 pl2303_update_line_status(port, data, actual_length); 1211 1212 exit: 1213 retval = usb_submit_urb(urb, GFP_ATOMIC); 1214 if (retval) { 1215 dev_err(&port->dev, 1216 "%s - usb_submit_urb failed with result %d\n", 1217 __func__, retval); 1218 } 1219 } 1220 1221 static void pl2303_process_read_urb(struct urb *urb) 1222 { 1223 struct usb_serial_port *port = urb->context; 1224 struct pl2303_private *priv = usb_get_serial_port_data(port); 1225 unsigned char *data = urb->transfer_buffer; 1226 char tty_flag = TTY_NORMAL; 1227 unsigned long flags; 1228 u8 line_status; 1229 int i; 1230 1231 /* update line status */ 1232 spin_lock_irqsave(&priv->lock, flags); 1233 line_status = priv->line_status; 1234 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 1235 spin_unlock_irqrestore(&priv->lock, flags); 1236 1237 if (!urb->actual_length) 1238 return; 1239 1240 /* 1241 * Break takes precedence over parity, which takes precedence over 1242 * framing errors. 1243 */ 1244 if (line_status & UART_BREAK_ERROR) 1245 tty_flag = TTY_BREAK; 1246 else if (line_status & UART_PARITY_ERROR) 1247 tty_flag = TTY_PARITY; 1248 else if (line_status & UART_FRAME_ERROR) 1249 tty_flag = TTY_FRAME; 1250 1251 if (tty_flag != TTY_NORMAL) 1252 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 1253 tty_flag); 1254 /* overrun is special, not associated with a char */ 1255 if (line_status & UART_OVERRUN_ERROR) 1256 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 1257 1258 if (port->sysrq) { 1259 for (i = 0; i < urb->actual_length; ++i) 1260 if (!usb_serial_handle_sysrq_char(port, data[i])) 1261 tty_insert_flip_char(&port->port, data[i], 1262 tty_flag); 1263 } else { 1264 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 1265 urb->actual_length); 1266 } 1267 1268 tty_flip_buffer_push(&port->port); 1269 } 1270 1271 static struct usb_serial_driver pl2303_device = { 1272 .driver = { 1273 .name = "pl2303", 1274 }, 1275 .id_table = id_table, 1276 .num_bulk_in = 1, 1277 .num_bulk_out = 1, 1278 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */ 1279 .bulk_in_size = 256, 1280 .bulk_out_size = 256, 1281 .open = pl2303_open, 1282 .close = pl2303_close, 1283 .dtr_rts = pl2303_dtr_rts, 1284 .carrier_raised = pl2303_carrier_raised, 1285 .break_ctl = pl2303_break_ctl, 1286 .set_termios = pl2303_set_termios, 1287 .tiocmget = pl2303_tiocmget, 1288 .tiocmset = pl2303_tiocmset, 1289 .tiocmiwait = usb_serial_generic_tiocmiwait, 1290 .process_read_urb = pl2303_process_read_urb, 1291 .read_int_callback = pl2303_read_int_callback, 1292 .probe = pl2303_probe, 1293 .calc_num_ports = pl2303_calc_num_ports, 1294 .attach = pl2303_startup, 1295 .release = pl2303_release, 1296 .port_probe = pl2303_port_probe, 1297 .port_remove = pl2303_port_remove, 1298 }; 1299 1300 static struct usb_serial_driver * const serial_drivers[] = { 1301 &pl2303_device, NULL 1302 }; 1303 1304 module_usb_serial_driver(serial_drivers, id_table); 1305 1306 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 1307 MODULE_LICENSE("GPL v2"); 1308