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(PL2303_VENDOR_ID, PL256X_PRODUCT_ID_4P) }, 55 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, 56 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, 57 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID), 58 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 59 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485), 60 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 61 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B), 62 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 63 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) }, 64 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, 65 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, 66 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, 67 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, 68 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, 69 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, 70 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, 71 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, 72 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, 73 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, 74 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, 75 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, 76 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1), 77 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 78 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65), 79 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 80 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75), 81 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 82 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81), 83 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 84 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */ 85 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) }, 86 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) }, 87 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) }, 88 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) }, 89 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) }, 90 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) }, 91 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) }, 92 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) }, 93 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID), 94 .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, 95 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) }, 96 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) }, 97 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) }, 98 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) }, 99 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) }, 100 { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) }, 101 { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) }, 102 { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) }, 103 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) }, 104 { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) }, 105 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) }, 106 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) }, 107 { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) }, 108 { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) }, 109 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) }, 110 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) }, 111 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, 112 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, 113 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, 114 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, 115 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, 116 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) }, 117 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, 118 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) }, 119 { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) }, 120 { USB_DEVICE(MACROSILICON_VENDOR_ID, MACROSILICON_MS3020_PRODUCT_ID) }, 121 { } /* Terminating entry */ 122 }; 123 124 MODULE_DEVICE_TABLE(usb, id_table); 125 126 #define SET_LINE_REQUEST_TYPE 0x21 127 #define SET_LINE_REQUEST 0x20 128 129 #define SET_CONTROL_REQUEST_TYPE 0x21 130 #define SET_CONTROL_REQUEST 0x22 131 #define CONTROL_DTR 0x01 132 #define CONTROL_RTS 0x02 133 134 #define BREAK_REQUEST_TYPE 0x21 135 #define BREAK_REQUEST 0x23 136 #define BREAK_ON 0xffff 137 #define BREAK_OFF 0x0000 138 139 #define GET_LINE_REQUEST_TYPE 0xa1 140 #define GET_LINE_REQUEST 0x21 141 142 #define VENDOR_WRITE_REQUEST_TYPE 0x40 143 #define VENDOR_WRITE_REQUEST 0x01 144 #define VENDOR_WRITE_NREQUEST 0x80 145 #define VENDOR_WRITE_MPREQUEST 0x80 146 147 #define VENDOR_READ_REQUEST_TYPE 0xc0 148 #define VENDOR_READ_REQUEST 0x01 149 #define VENDOR_READ_NREQUEST 0x81 150 #define VENDOR_READ_MPREQUEST 0x80 151 152 #define PL256X_RESET_REQUEST_TYPE 0x40 153 #define PL256X_RESET_REQUEST 0x96 154 155 #define UART_STATE_INDEX 8 156 #define UART_STATE_MSR_MASK 0x8b 157 #define UART_STATE_TRANSIENT_MASK 0x74 158 #define UART_DCD 0x01 159 #define UART_DSR 0x02 160 #define UART_BREAK_ERROR 0x04 161 #define UART_RING 0x08 162 #define UART_FRAME_ERROR 0x10 163 #define UART_PARITY_ERROR 0x20 164 #define UART_OVERRUN_ERROR 0x40 165 #define UART_CTS 0x80 166 167 #define PL2303_FLOWCTRL_MASK 0xf0 168 169 #define PL2303_READ_TYPE_HX_STATUS 0x8080 170 171 #define PL2303_HXN_RESET_REG 0x07 172 #define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02 173 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01 174 175 #define PL2303_HXN_FLOWCTRL_REG 0x0a 176 #define PL2303_HXN_FLOWCTRL_MASK 0x1c 177 #define PL2303_HXN_FLOWCTRL_NONE 0x1c 178 #define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18 179 #define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c 180 181 #define PL256X_PORT_A_FLOWCTRL_REG 0xc005 182 #define PL256X_PORT_B_FLOWCTRL_REG 0xd005 183 #define PL256X_PORT_C_FLOWCTRL_REG 0xe005 184 #define PL256X_PORT_D_FLOWCTRL_REG 0xf005 185 186 #define PL256X_FLOWCTRL_MASK 0x43 187 #define PL256X_FLOWCTRL_XON_XOFF 0x40 188 #define PL256X_FLOWCTRL_RTS_CTS 0x03 189 #define PL256X_FLOWCTRL_NONE 0x00 190 191 static int pl2303_set_break(struct usb_serial_port *port, bool enable); 192 193 enum pl2303_type { 194 TYPE_H, 195 TYPE_HX, 196 TYPE_TA, 197 TYPE_TB, 198 TYPE_HXD, 199 TYPE_HXN, 200 TYPE_MP, 201 TYPE_COUNT 202 }; 203 204 struct pl2303_type_data { 205 const char *name; 206 speed_t max_baud_rate; 207 unsigned long quirks; 208 unsigned int no_autoxonxoff:1; 209 unsigned int no_divisors:1; 210 unsigned int alt_divisors:1; 211 }; 212 213 struct pl2303_serial_private { 214 const struct pl2303_type_data *type; 215 unsigned long quirks; 216 u16 interface_num; 217 u16 flowctrl_reg; 218 }; 219 220 struct pl2303_private { 221 spinlock_t lock; 222 u8 line_control; 223 u8 line_status; 224 225 u8 line_settings[7]; 226 }; 227 228 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 229 [TYPE_H] = { 230 .name = "H", 231 .max_baud_rate = 1228800, 232 .quirks = PL2303_QUIRK_LEGACY, 233 .no_autoxonxoff = true, 234 }, 235 [TYPE_HX] = { 236 .name = "HX", 237 .max_baud_rate = 6000000, 238 }, 239 [TYPE_TA] = { 240 .name = "TA", 241 .max_baud_rate = 6000000, 242 .alt_divisors = true, 243 }, 244 [TYPE_TB] = { 245 .name = "TB", 246 .max_baud_rate = 12000000, 247 .alt_divisors = true, 248 }, 249 [TYPE_HXD] = { 250 .name = "HXD", 251 .max_baud_rate = 12000000, 252 }, 253 [TYPE_HXN] = { 254 .name = "G", 255 .max_baud_rate = 12000000, 256 .no_divisors = true, 257 }, 258 [TYPE_MP] = { 259 .name = "MP", 260 .max_baud_rate = 24000000, 261 .no_divisors = true, 262 }, 263 }; 264 265 static int pl256x_uart_reset(struct usb_serial *serial) 266 { 267 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 268 struct device *dev = &serial->interface->dev; 269 int res; 270 271 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 272 PL256X_RESET_REQUEST, PL256X_RESET_REQUEST_TYPE, 273 0, spriv->interface_num, NULL, 0, 100); 274 if (res) { 275 dev_err(dev, "failed to reset device: %d\n", res); 276 return res; 277 } 278 279 return 0; 280 } 281 282 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 283 unsigned char buf[1]) 284 { 285 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 286 struct device *dev = &serial->interface->dev; 287 u8 request; 288 int res; 289 290 if (spriv->type == &pl2303_type_data[TYPE_HXN]) 291 request = VENDOR_READ_NREQUEST; 292 else if (spriv->type == &pl2303_type_data[TYPE_MP]) 293 request = VENDOR_READ_MPREQUEST; 294 else 295 request = VENDOR_READ_REQUEST; 296 297 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 298 request, VENDOR_READ_REQUEST_TYPE, 299 value, 0, buf, 1, 100); 300 if (res != 1) { 301 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 302 value, res); 303 if (res >= 0) 304 res = -EIO; 305 306 return res; 307 } 308 309 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 310 311 return 0; 312 } 313 314 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 315 { 316 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 317 struct device *dev = &serial->interface->dev; 318 u8 request; 319 int res; 320 321 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 322 323 if (spriv->type == &pl2303_type_data[TYPE_HXN]) 324 request = VENDOR_WRITE_NREQUEST; 325 else if (spriv->type == &pl2303_type_data[TYPE_MP]) 326 request = VENDOR_WRITE_MPREQUEST; 327 else 328 request = VENDOR_WRITE_REQUEST; 329 330 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 331 request, VENDOR_WRITE_REQUEST_TYPE, 332 value, index, NULL, 0, 100); 333 if (res) { 334 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 335 value, res); 336 return res; 337 } 338 339 return 0; 340 } 341 342 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val) 343 { 344 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 345 int ret = 0; 346 u8 *buf; 347 348 buf = kmalloc(1, GFP_KERNEL); 349 if (!buf) 350 return -ENOMEM; 351 352 if (spriv->type == &pl2303_type_data[TYPE_HXN] || 353 spriv->type == &pl2303_type_data[TYPE_MP]) { 354 ret = pl2303_vendor_read(serial, reg, buf); 355 } else { 356 ret = pl2303_vendor_read(serial, reg | 0x80, buf); 357 } 358 359 if (ret) 360 goto out_free; 361 362 *buf &= ~mask; 363 *buf |= val & mask; 364 365 ret = pl2303_vendor_write(serial, reg, *buf); 366 out_free: 367 kfree(buf); 368 369 return ret; 370 } 371 372 static int pl2303_probe(struct usb_serial *serial, 373 const struct usb_device_id *id) 374 { 375 usb_set_serial_data(serial, (void *)id->driver_info); 376 377 return 0; 378 } 379 380 /* 381 * Use interrupt endpoint from first interface if available. 382 * 383 * This is needed due to the looney way its endpoints are set up. 384 */ 385 static int pl2303_endpoint_hack(struct usb_serial *serial, 386 struct usb_serial_endpoints *epds) 387 { 388 struct usb_interface *interface = serial->interface; 389 struct usb_device *dev = serial->dev; 390 struct device *ddev = &interface->dev; 391 struct usb_host_interface *iface_desc; 392 struct usb_endpoint_descriptor *endpoint; 393 unsigned int i; 394 395 if (interface == dev->actconfig->interface[0]) 396 return 0; 397 398 /* check out the endpoints of the other interface */ 399 iface_desc = dev->actconfig->interface[0]->cur_altsetting; 400 401 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 402 endpoint = &iface_desc->endpoint[i].desc; 403 404 if (!usb_endpoint_is_int_in(endpoint)) 405 continue; 406 407 dev_dbg(ddev, "found interrupt in on separate interface\n"); 408 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in)) 409 epds->interrupt_in[epds->num_interrupt_in++] = endpoint; 410 } 411 412 return 0; 413 } 414 415 static int pl2303_calc_num_ports(struct usb_serial *serial, 416 struct usb_serial_endpoints *epds) 417 { 418 unsigned long quirks = (unsigned long)usb_get_serial_data(serial); 419 struct device *dev = &serial->interface->dev; 420 int ret; 421 422 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) { 423 ret = pl2303_endpoint_hack(serial, epds); 424 if (ret) 425 return ret; 426 } 427 428 if (epds->num_interrupt_in < 1) { 429 dev_err(dev, "required interrupt-in endpoint missing\n"); 430 return -ENODEV; 431 } 432 433 return 1; 434 } 435 436 static bool pl2303_supports_hx_status(struct usb_serial *serial) 437 { 438 int ret; 439 u8 buf; 440 441 ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST, 442 VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS, 443 0, &buf, 1, 100, GFP_KERNEL); 444 445 return ret == 0; 446 } 447 448 static int pl2303_detect_type(struct usb_serial *serial) 449 { 450 struct usb_device_descriptor *desc = &serial->dev->descriptor; 451 u16 bcdDevice, bcdUSB; 452 453 /* 454 * Legacy PL2303H, variants 0 and 1 (difference unknown). 455 */ 456 if (desc->bDeviceClass == 0x02) 457 return TYPE_H; /* variant 0 */ 458 459 if (desc->bMaxPacketSize0 != 0x40) { 460 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff) 461 return TYPE_H; /* variant 1 */ 462 463 return TYPE_H; /* variant 0 */ 464 } 465 466 bcdDevice = le16_to_cpu(desc->bcdDevice); 467 bcdUSB = le16_to_cpu(desc->bcdUSB); 468 469 switch (bcdUSB) { 470 case 0x101: 471 /* USB 1.0.1? Let's assume they meant 1.1... */ 472 fallthrough; 473 case 0x110: 474 switch (bcdDevice) { 475 case 0x300: 476 return TYPE_HX; 477 case 0x400: 478 return TYPE_HXD; 479 default: 480 return TYPE_HX; 481 } 482 break; 483 case 0x200: 484 switch (bcdDevice) { 485 case 0x100: /* GC */ 486 case 0x105: 487 return TYPE_HXN; 488 case 0x300: /* GT / TA */ 489 if (pl2303_supports_hx_status(serial)) 490 return TYPE_TA; 491 fallthrough; 492 case 0x305: 493 case 0x400: /* GL */ 494 case 0x405: 495 return TYPE_HXN; 496 case 0x500: /* GE / TB */ 497 if (pl2303_supports_hx_status(serial)) 498 return TYPE_TB; 499 fallthrough; 500 case 0x505: 501 case 0x600: /* GS */ 502 case 0x605: 503 case 0x700: /* GR */ 504 case 0x705: 505 case 0x905: /* GT-2AB */ 506 case 0x1005: /* GC-Q20 */ 507 return TYPE_HXN; 508 case 0x3302: /* PL2533 VC 2 Port */ 509 case 0x3304: /* PL2533 VC 4 Port */ 510 case 0x4302: /* PL2543 VC 2 Port */ 511 case 0x4304: /* PL2543 VC 4 Port */ 512 case 0x6502: /* PL2565 VC 2 Port */ 513 case 0x6504: /* PL2565 VC 4 Port */ 514 case 0x6506: /* PL2565 VC 4 Port QFN64 package */ 515 return TYPE_MP; 516 } 517 break; 518 } 519 520 dev_err(&serial->interface->dev, 521 "unknown device type, please report to linux-usb@vger.kernel.org\n"); 522 return -ENODEV; 523 } 524 525 static bool pl2303_is_hxd_clone(struct usb_serial *serial) 526 { 527 struct usb_device *udev = serial->dev; 528 unsigned char *buf; 529 int ret; 530 531 buf = kmalloc(7, GFP_KERNEL); 532 if (!buf) 533 return false; 534 535 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 536 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 537 0, 0, buf, 7, 100); 538 539 kfree(buf); 540 541 return ret == -EPIPE; 542 } 543 544 static int pl2303_startup(struct usb_serial *serial) 545 { 546 struct pl2303_serial_private *spriv; 547 enum pl2303_type type; 548 unsigned char *buf; 549 unsigned int ifnum; 550 int ret; 551 552 ret = pl2303_detect_type(serial); 553 if (ret < 0) 554 return ret; 555 556 type = ret; 557 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name); 558 559 ifnum = serial->interface->altsetting->desc.bInterfaceNumber; 560 561 spriv = kzalloc_obj(*spriv); 562 if (!spriv) 563 return -ENOMEM; 564 565 if (type == TYPE_MP) { 566 switch (ifnum) { 567 case 0: 568 spriv->flowctrl_reg = PL256X_PORT_A_FLOWCTRL_REG; 569 break; 570 case 1: 571 spriv->flowctrl_reg = PL256X_PORT_B_FLOWCTRL_REG; 572 break; 573 case 2: 574 spriv->flowctrl_reg = PL256X_PORT_C_FLOWCTRL_REG; 575 break; 576 case 3: 577 spriv->flowctrl_reg = PL256X_PORT_D_FLOWCTRL_REG; 578 break; 579 default: 580 kfree(spriv); 581 return -ENODEV; 582 } 583 } 584 585 spriv->type = &pl2303_type_data[type]; 586 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 587 spriv->quirks |= spriv->type->quirks; 588 spriv->interface_num = ifnum; 589 590 if (type == TYPE_HXD && pl2303_is_hxd_clone(serial)) 591 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE; 592 593 usb_set_serial_data(serial, spriv); 594 595 if (type != TYPE_HXN && type != TYPE_MP) { 596 buf = kmalloc(1, GFP_KERNEL); 597 if (!buf) { 598 kfree(spriv); 599 return -ENOMEM; 600 } 601 602 pl2303_vendor_read(serial, 0x8484, buf); 603 pl2303_vendor_write(serial, 0x0404, 0); 604 pl2303_vendor_read(serial, 0x8484, buf); 605 pl2303_vendor_read(serial, 0x8383, buf); 606 pl2303_vendor_read(serial, 0x8484, buf); 607 pl2303_vendor_write(serial, 0x0404, 1); 608 pl2303_vendor_read(serial, 0x8484, buf); 609 pl2303_vendor_read(serial, 0x8383, buf); 610 pl2303_vendor_write(serial, 0, 1); 611 pl2303_vendor_write(serial, 1, 0); 612 if (spriv->quirks & PL2303_QUIRK_LEGACY) 613 pl2303_vendor_write(serial, 2, 0x24); 614 else 615 pl2303_vendor_write(serial, 2, 0x44); 616 617 kfree(buf); 618 } 619 620 return 0; 621 } 622 623 static void pl2303_release(struct usb_serial *serial) 624 { 625 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 626 627 kfree(spriv); 628 } 629 630 static int pl2303_port_probe(struct usb_serial_port *port) 631 { 632 struct pl2303_private *priv; 633 634 priv = kzalloc_obj(*priv); 635 if (!priv) 636 return -ENOMEM; 637 638 spin_lock_init(&priv->lock); 639 640 usb_set_serial_port_data(port, priv); 641 642 port->port.drain_delay = 256; 643 644 return 0; 645 } 646 647 static void pl2303_port_remove(struct usb_serial_port *port) 648 { 649 struct pl2303_private *priv = usb_get_serial_port_data(port); 650 651 kfree(priv); 652 } 653 654 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 655 { 656 struct usb_device *dev = port->serial->dev; 657 struct usb_serial *serial = port->serial; 658 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 659 int retval; 660 661 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 662 663 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 664 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 665 value, spriv->interface_num, NULL, 0, 100); 666 if (retval) 667 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 668 669 return retval; 670 } 671 672 /* 673 * Returns the nearest supported baud rate that can be set directly without 674 * using divisors. 675 */ 676 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 677 { 678 static const speed_t baud_sup[] = { 679 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 680 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 681 614400, 921600, 1228800, 2457600, 3000000, 6000000 682 }; 683 684 unsigned i; 685 686 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 687 if (baud_sup[i] > baud) 688 break; 689 } 690 691 if (i == ARRAY_SIZE(baud_sup)) 692 baud = baud_sup[i - 1]; 693 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 694 baud = baud_sup[i - 1]; 695 else 696 baud = baud_sup[i]; 697 698 return baud; 699 } 700 701 /* 702 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 703 * use 9600 baud. 704 */ 705 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 706 speed_t baud) 707 { 708 put_unaligned_le32(baud, buf); 709 710 return baud; 711 } 712 713 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 714 speed_t baud) 715 { 716 unsigned int baseline, mantissa, exponent; 717 718 /* 719 * Apparently the formula is: 720 * baudrate = 12M * 32 / (mantissa * 4^exponent) 721 * where 722 * mantissa = buf[8:0] 723 * exponent = buf[11:9] 724 */ 725 baseline = 12000000 * 32; 726 mantissa = baseline / baud; 727 if (mantissa == 0) 728 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 729 exponent = 0; 730 while (mantissa >= 512) { 731 if (exponent < 7) { 732 mantissa >>= 2; /* divide by 4 */ 733 exponent++; 734 } else { 735 /* Exponent is maxed. Trim mantissa and leave. */ 736 mantissa = 511; 737 break; 738 } 739 } 740 741 buf[3] = 0x80; 742 buf[2] = 0; 743 buf[1] = exponent << 1 | mantissa >> 8; 744 buf[0] = mantissa & 0xff; 745 746 /* Calculate and return the exact baud rate. */ 747 baud = (baseline / mantissa) >> (exponent << 1); 748 749 return baud; 750 } 751 752 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4], 753 speed_t baud) 754 { 755 unsigned int baseline, mantissa, exponent; 756 757 /* 758 * Apparently, for the TA version the formula is: 759 * baudrate = 12M * 32 / (mantissa * 2^exponent) 760 * where 761 * mantissa = buf[10:0] 762 * exponent = buf[15:13 16] 763 */ 764 baseline = 12000000 * 32; 765 mantissa = baseline / baud; 766 if (mantissa == 0) 767 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 768 exponent = 0; 769 while (mantissa >= 2048) { 770 if (exponent < 15) { 771 mantissa >>= 1; /* divide by 2 */ 772 exponent++; 773 } else { 774 /* Exponent is maxed. Trim mantissa and leave. */ 775 mantissa = 2047; 776 break; 777 } 778 } 779 780 buf[3] = 0x80; 781 buf[2] = exponent & 0x01; 782 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8; 783 buf[0] = mantissa & 0xff; 784 785 /* Calculate and return the exact baud rate. */ 786 baud = (baseline / mantissa) >> exponent; 787 788 return baud; 789 } 790 791 static void pl2303_encode_baud_rate(struct tty_struct *tty, 792 struct usb_serial_port *port, 793 u8 buf[4]) 794 { 795 struct usb_serial *serial = port->serial; 796 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 797 speed_t baud_sup; 798 speed_t baud; 799 800 baud = tty_get_baud_rate(tty); 801 dev_dbg(&port->dev, "baud requested = %u\n", baud); 802 if (!baud) 803 return; 804 805 if (spriv->type->max_baud_rate) 806 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 807 /* 808 * Use direct method for supported baud rates, otherwise use divisors. 809 * Newer chip types do not support divisor encoding. 810 */ 811 if (spriv->type->no_divisors) 812 baud_sup = baud; 813 else 814 baud_sup = pl2303_get_supported_baud_rate(baud); 815 816 if (baud == baud_sup) 817 baud = pl2303_encode_baud_rate_direct(buf, baud); 818 else if (spriv->type->alt_divisors) 819 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud); 820 else 821 baud = pl2303_encode_baud_rate_divisor(buf, baud); 822 823 /* Save resulting baud rate */ 824 tty_encode_baud_rate(tty, baud, baud); 825 dev_dbg(&port->dev, "baud set = %u\n", baud); 826 } 827 828 static int pl2303_get_line_request(struct usb_serial_port *port, 829 unsigned char buf[7]) 830 { 831 struct usb_serial *serial = port->serial; 832 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 833 struct usb_device *udev = serial->dev; 834 int ret; 835 836 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) { 837 struct pl2303_private *priv = usb_get_serial_port_data(port); 838 839 memcpy(buf, priv->line_settings, 7); 840 return 0; 841 } 842 843 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 844 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 845 0, spriv->interface_num, buf, 7, 100); 846 if (ret != 7) { 847 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 848 849 if (ret >= 0) 850 ret = -EIO; 851 852 return ret; 853 } 854 855 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 856 857 return 0; 858 } 859 860 static int pl2303_set_line_request(struct usb_serial_port *port, 861 unsigned char buf[7]) 862 { 863 struct usb_device *udev = port->serial->dev; 864 struct usb_serial *serial = port->serial; 865 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 866 int ret; 867 868 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 869 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 870 0, spriv->interface_num, buf, 7, 100); 871 if (ret < 0) { 872 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 873 return ret; 874 } 875 876 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 877 878 return 0; 879 } 880 881 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b) 882 { 883 bool ixon_change; 884 885 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) || 886 a->c_cc[VSTART] != b->c_cc[VSTART] || 887 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 888 889 return tty_termios_hw_change(a, b) || ixon_change; 890 } 891 892 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type) 893 { 894 if (!I_IXON(tty) || I_IXANY(tty)) 895 return false; 896 897 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13) 898 return false; 899 900 if (type->no_autoxonxoff) 901 return false; 902 903 return true; 904 } 905 906 static void pl2303_set_termios(struct tty_struct *tty, 907 struct usb_serial_port *port, 908 const struct ktermios *old_termios) 909 { 910 struct usb_serial *serial = port->serial; 911 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 912 struct pl2303_private *priv = usb_get_serial_port_data(port); 913 unsigned long flags; 914 unsigned char *buf; 915 int ret; 916 u8 control; 917 918 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios)) 919 return; 920 921 buf = kzalloc(7, GFP_KERNEL); 922 if (!buf) { 923 /* Report back no change occurred */ 924 if (old_termios) 925 tty->termios = *old_termios; 926 return; 927 } 928 929 pl2303_get_line_request(port, buf); 930 931 buf[6] = tty_get_char_size(tty->termios.c_cflag); 932 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 933 934 /* For reference buf[0]:buf[3] baud rate value */ 935 pl2303_encode_baud_rate(tty, port, &buf[0]); 936 937 /* For reference buf[4]=0 is 1 stop bits */ 938 /* For reference buf[4]=1 is 1.5 stop bits */ 939 /* For reference buf[4]=2 is 2 stop bits */ 940 if (C_CSTOPB(tty)) { 941 /* 942 * NOTE: Comply with "real" UARTs / RS232: 943 * use 1.5 instead of 2 stop bits with 5 data bits 944 */ 945 if (C_CSIZE(tty) == CS5) { 946 buf[4] = 1; 947 dev_dbg(&port->dev, "stop bits = 1.5\n"); 948 } else { 949 buf[4] = 2; 950 dev_dbg(&port->dev, "stop bits = 2\n"); 951 } 952 } else { 953 buf[4] = 0; 954 dev_dbg(&port->dev, "stop bits = 1\n"); 955 } 956 957 if (C_PARENB(tty)) { 958 /* For reference buf[5]=0 is none parity */ 959 /* For reference buf[5]=1 is odd parity */ 960 /* For reference buf[5]=2 is even parity */ 961 /* For reference buf[5]=3 is mark parity */ 962 /* For reference buf[5]=4 is space parity */ 963 if (C_PARODD(tty)) { 964 if (C_CMSPAR(tty)) { 965 buf[5] = 3; 966 dev_dbg(&port->dev, "parity = mark\n"); 967 } else { 968 buf[5] = 1; 969 dev_dbg(&port->dev, "parity = odd\n"); 970 } 971 } else { 972 if (C_CMSPAR(tty)) { 973 buf[5] = 4; 974 dev_dbg(&port->dev, "parity = space\n"); 975 } else { 976 buf[5] = 2; 977 dev_dbg(&port->dev, "parity = even\n"); 978 } 979 } 980 } else { 981 buf[5] = 0; 982 dev_dbg(&port->dev, "parity = none\n"); 983 } 984 985 /* 986 * Some PL2303 are known to lose bytes if you change serial settings 987 * even to the same values as before. Thus we actually need to filter 988 * in this specific case. 989 * 990 * Note that the tty_termios_hw_change check above is not sufficient 991 * as a previously requested baud rate may differ from the one 992 * actually used (and stored in old_termios). 993 * 994 * NOTE: No additional locking needed for line_settings as it is 995 * only used in set_termios, which is serialised against itself. 996 */ 997 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 998 ret = pl2303_set_line_request(port, buf); 999 if (!ret) 1000 memcpy(priv->line_settings, buf, 7); 1001 } 1002 1003 /* change control lines if we are switching to or from B0 */ 1004 spin_lock_irqsave(&priv->lock, flags); 1005 control = priv->line_control; 1006 if (C_BAUD(tty) == B0) 1007 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 1008 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 1009 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 1010 if (control != priv->line_control) { 1011 control = priv->line_control; 1012 spin_unlock_irqrestore(&priv->lock, flags); 1013 pl2303_set_control_lines(port, control); 1014 } else { 1015 spin_unlock_irqrestore(&priv->lock, flags); 1016 } 1017 1018 if (C_CRTSCTS(tty)) { 1019 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 1020 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40); 1021 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 1022 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 1023 PL2303_HXN_FLOWCTRL_MASK, 1024 PL2303_HXN_FLOWCTRL_RTS_CTS); 1025 } else if (spriv->type == &pl2303_type_data[TYPE_MP]) { 1026 pl2303_vendor_write(serial, spriv->flowctrl_reg, 1027 PL256X_FLOWCTRL_RTS_CTS); 1028 } else { 1029 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60); 1030 } 1031 } else if (pl2303_enable_xonxoff(tty, spriv->type)) { 1032 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 1033 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 1034 PL2303_HXN_FLOWCTRL_MASK, 1035 PL2303_HXN_FLOWCTRL_XON_XOFF); 1036 } else if (spriv->type == &pl2303_type_data[TYPE_MP]) { 1037 pl2303_vendor_write(serial, spriv->flowctrl_reg, 1038 PL256X_FLOWCTRL_XON_XOFF); 1039 } else { 1040 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0); 1041 } 1042 } else { 1043 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 1044 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG, 1045 PL2303_HXN_FLOWCTRL_MASK, 1046 PL2303_HXN_FLOWCTRL_NONE); 1047 } else if (spriv->type == &pl2303_type_data[TYPE_MP]) { 1048 pl2303_vendor_write(serial, spriv->flowctrl_reg, 1049 PL256X_FLOWCTRL_NONE); 1050 } else { 1051 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0); 1052 } 1053 } 1054 1055 kfree(buf); 1056 } 1057 1058 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 1059 { 1060 struct pl2303_private *priv = usb_get_serial_port_data(port); 1061 unsigned long flags; 1062 u8 control; 1063 1064 spin_lock_irqsave(&priv->lock, flags); 1065 if (on) 1066 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 1067 else 1068 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 1069 control = priv->line_control; 1070 spin_unlock_irqrestore(&priv->lock, flags); 1071 1072 pl2303_set_control_lines(port, control); 1073 } 1074 1075 static void pl2303_close(struct usb_serial_port *port) 1076 { 1077 usb_serial_generic_close(port); 1078 usb_kill_urb(port->interrupt_in_urb); 1079 pl2303_set_break(port, false); 1080 } 1081 1082 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 1083 { 1084 struct usb_serial *serial = port->serial; 1085 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1086 int result; 1087 1088 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 1089 usb_clear_halt(serial->dev, port->write_urb->pipe); 1090 usb_clear_halt(serial->dev, port->read_urb->pipe); 1091 } else { 1092 /* reset upstream data pipes */ 1093 if (spriv->type == &pl2303_type_data[TYPE_HXN]) { 1094 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG, 1095 PL2303_HXN_RESET_UPSTREAM_PIPE | 1096 PL2303_HXN_RESET_DOWNSTREAM_PIPE); 1097 } else if (spriv->type == &pl2303_type_data[TYPE_MP]) { 1098 pl256x_uart_reset(serial); 1099 } else { 1100 pl2303_vendor_write(serial, 8, 0); 1101 pl2303_vendor_write(serial, 9, 0); 1102 } 1103 } 1104 1105 /* Setup termios */ 1106 if (tty) 1107 pl2303_set_termios(tty, port, NULL); 1108 1109 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1110 if (result) { 1111 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 1112 result); 1113 return result; 1114 } 1115 1116 result = usb_serial_generic_open(tty, port); 1117 if (result) { 1118 usb_kill_urb(port->interrupt_in_urb); 1119 return result; 1120 } 1121 1122 return 0; 1123 } 1124 1125 static int pl2303_tiocmset(struct tty_struct *tty, 1126 unsigned int set, unsigned int clear) 1127 { 1128 struct usb_serial_port *port = tty->driver_data; 1129 struct pl2303_private *priv = usb_get_serial_port_data(port); 1130 unsigned long flags; 1131 u8 control; 1132 int ret; 1133 1134 spin_lock_irqsave(&priv->lock, flags); 1135 if (set & TIOCM_RTS) 1136 priv->line_control |= CONTROL_RTS; 1137 if (set & TIOCM_DTR) 1138 priv->line_control |= CONTROL_DTR; 1139 if (clear & TIOCM_RTS) 1140 priv->line_control &= ~CONTROL_RTS; 1141 if (clear & TIOCM_DTR) 1142 priv->line_control &= ~CONTROL_DTR; 1143 control = priv->line_control; 1144 spin_unlock_irqrestore(&priv->lock, flags); 1145 1146 ret = pl2303_set_control_lines(port, control); 1147 if (ret) 1148 return usb_translate_errors(ret); 1149 1150 return 0; 1151 } 1152 1153 static int pl2303_tiocmget(struct tty_struct *tty) 1154 { 1155 struct usb_serial_port *port = tty->driver_data; 1156 struct pl2303_private *priv = usb_get_serial_port_data(port); 1157 unsigned long flags; 1158 unsigned int mcr; 1159 unsigned int status; 1160 unsigned int result; 1161 1162 spin_lock_irqsave(&priv->lock, flags); 1163 mcr = priv->line_control; 1164 status = priv->line_status; 1165 spin_unlock_irqrestore(&priv->lock, flags); 1166 1167 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 1168 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 1169 | ((status & UART_CTS) ? TIOCM_CTS : 0) 1170 | ((status & UART_DSR) ? TIOCM_DSR : 0) 1171 | ((status & UART_RING) ? TIOCM_RI : 0) 1172 | ((status & UART_DCD) ? TIOCM_CD : 0); 1173 1174 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 1175 1176 return result; 1177 } 1178 1179 static int pl2303_carrier_raised(struct usb_serial_port *port) 1180 { 1181 struct pl2303_private *priv = usb_get_serial_port_data(port); 1182 1183 if (priv->line_status & UART_DCD) 1184 return 1; 1185 1186 return 0; 1187 } 1188 1189 static int pl2303_set_break(struct usb_serial_port *port, bool enable) 1190 { 1191 struct usb_serial *serial = port->serial; 1192 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1193 u16 state; 1194 int result; 1195 1196 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) 1197 return -ENOTTY; 1198 1199 if (enable) 1200 state = BREAK_ON; 1201 else 1202 state = BREAK_OFF; 1203 1204 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1205 state == BREAK_OFF ? "off" : "on"); 1206 1207 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1208 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 1209 spriv->interface_num, NULL, 0, 100); 1210 if (result) { 1211 dev_err(&port->dev, "error sending break = %d\n", result); 1212 return result; 1213 } 1214 1215 return 0; 1216 } 1217 1218 static int pl2303_break_ctl(struct tty_struct *tty, int state) 1219 { 1220 struct usb_serial_port *port = tty->driver_data; 1221 1222 return pl2303_set_break(port, state); 1223 } 1224 1225 static void pl2303_update_line_status(struct usb_serial_port *port, 1226 unsigned char *data, 1227 unsigned int actual_length) 1228 { 1229 struct usb_serial *serial = port->serial; 1230 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 1231 struct pl2303_private *priv = usb_get_serial_port_data(port); 1232 struct tty_struct *tty; 1233 unsigned long flags; 1234 unsigned int status_idx = UART_STATE_INDEX; 1235 u8 status; 1236 u8 delta; 1237 1238 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 1239 status_idx = 0; 1240 1241 if (actual_length < status_idx + 1) 1242 return; 1243 1244 status = data[status_idx]; 1245 1246 /* Save off the uart status for others to look at */ 1247 spin_lock_irqsave(&priv->lock, flags); 1248 delta = priv->line_status ^ status; 1249 priv->line_status = status; 1250 spin_unlock_irqrestore(&priv->lock, flags); 1251 1252 if (status & UART_BREAK_ERROR) 1253 usb_serial_handle_break(port); 1254 1255 if (delta & UART_STATE_MSR_MASK) { 1256 if (delta & UART_CTS) 1257 port->icount.cts++; 1258 if (delta & UART_DSR) 1259 port->icount.dsr++; 1260 if (delta & UART_RING) 1261 port->icount.rng++; 1262 if (delta & UART_DCD) { 1263 port->icount.dcd++; 1264 tty = tty_port_tty_get(&port->port); 1265 if (tty) { 1266 usb_serial_handle_dcd_change(port, tty, 1267 status & UART_DCD); 1268 tty_kref_put(tty); 1269 } 1270 } 1271 1272 wake_up_interruptible(&port->port.delta_msr_wait); 1273 } 1274 } 1275 1276 static void pl2303_read_int_callback(struct urb *urb) 1277 { 1278 struct usb_serial_port *port = urb->context; 1279 unsigned char *data = urb->transfer_buffer; 1280 unsigned int actual_length = urb->actual_length; 1281 int status = urb->status; 1282 int retval; 1283 1284 switch (status) { 1285 case 0: 1286 /* success */ 1287 break; 1288 case -ECONNRESET: 1289 case -ENOENT: 1290 case -ESHUTDOWN: 1291 /* this urb is terminated, clean up */ 1292 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 1293 __func__, status); 1294 return; 1295 default: 1296 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 1297 __func__, status); 1298 goto exit; 1299 } 1300 1301 usb_serial_debug_data(&port->dev, __func__, 1302 urb->actual_length, urb->transfer_buffer); 1303 1304 pl2303_update_line_status(port, data, actual_length); 1305 1306 exit: 1307 retval = usb_submit_urb(urb, GFP_ATOMIC); 1308 if (retval) { 1309 dev_err(&port->dev, 1310 "%s - usb_submit_urb failed with result %d\n", 1311 __func__, retval); 1312 } 1313 } 1314 1315 static void pl2303_process_read_urb(struct urb *urb) 1316 { 1317 struct usb_serial_port *port = urb->context; 1318 struct pl2303_private *priv = usb_get_serial_port_data(port); 1319 unsigned char *data = urb->transfer_buffer; 1320 char tty_flag = TTY_NORMAL; 1321 unsigned long flags; 1322 u8 line_status; 1323 int i; 1324 1325 /* update line status */ 1326 spin_lock_irqsave(&priv->lock, flags); 1327 line_status = priv->line_status; 1328 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 1329 spin_unlock_irqrestore(&priv->lock, flags); 1330 1331 if (!urb->actual_length) 1332 return; 1333 1334 /* 1335 * Break takes precedence over parity, which takes precedence over 1336 * framing errors. 1337 */ 1338 if (line_status & UART_BREAK_ERROR) 1339 tty_flag = TTY_BREAK; 1340 else if (line_status & UART_PARITY_ERROR) 1341 tty_flag = TTY_PARITY; 1342 else if (line_status & UART_FRAME_ERROR) 1343 tty_flag = TTY_FRAME; 1344 1345 if (tty_flag != TTY_NORMAL) 1346 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 1347 tty_flag); 1348 /* overrun is special, not associated with a char */ 1349 if (line_status & UART_OVERRUN_ERROR) 1350 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 1351 1352 if (port->sysrq) { 1353 for (i = 0; i < urb->actual_length; ++i) 1354 if (!usb_serial_handle_sysrq_char(port, data[i])) 1355 tty_insert_flip_char(&port->port, data[i], 1356 tty_flag); 1357 } else { 1358 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 1359 urb->actual_length); 1360 } 1361 1362 tty_flip_buffer_push(&port->port); 1363 } 1364 1365 static struct usb_serial_driver pl2303_device = { 1366 .driver = { 1367 .name = "pl2303", 1368 }, 1369 .id_table = id_table, 1370 .num_bulk_in = 1, 1371 .num_bulk_out = 1, 1372 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */ 1373 .bulk_in_size = 256, 1374 .bulk_out_size = 256, 1375 .open = pl2303_open, 1376 .close = pl2303_close, 1377 .dtr_rts = pl2303_dtr_rts, 1378 .carrier_raised = pl2303_carrier_raised, 1379 .break_ctl = pl2303_break_ctl, 1380 .set_termios = pl2303_set_termios, 1381 .tiocmget = pl2303_tiocmget, 1382 .tiocmset = pl2303_tiocmset, 1383 .tiocmiwait = usb_serial_generic_tiocmiwait, 1384 .process_read_urb = pl2303_process_read_urb, 1385 .read_int_callback = pl2303_read_int_callback, 1386 .probe = pl2303_probe, 1387 .calc_num_ports = pl2303_calc_num_ports, 1388 .attach = pl2303_startup, 1389 .release = pl2303_release, 1390 .port_probe = pl2303_port_probe, 1391 .port_remove = pl2303_port_remove, 1392 }; 1393 1394 static struct usb_serial_driver * const serial_drivers[] = { 1395 &pl2303_device, NULL 1396 }; 1397 1398 module_usb_serial_driver(serial_drivers, id_table); 1399 1400 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 1401 MODULE_LICENSE("GPL v2"); 1402