1 /* 2 * Prolific PL2303 USB to serial adaptor driver 3 * 4 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com) 5 * Copyright (C) 2003 IBM Corp. 6 * 7 * Original driver for 2.2.x by anonymous 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License version 11 * 2 as published by the Free Software Foundation. 12 * 13 * See Documentation/usb/usb-serial.txt for more information on using this 14 * driver 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/errno.h> 19 #include <linux/slab.h> 20 #include <linux/tty.h> 21 #include <linux/tty_driver.h> 22 #include <linux/tty_flip.h> 23 #include <linux/serial.h> 24 #include <linux/module.h> 25 #include <linux/moduleparam.h> 26 #include <linux/spinlock.h> 27 #include <linux/uaccess.h> 28 #include <linux/usb.h> 29 #include <linux/usb/serial.h> 30 #include <asm/unaligned.h> 31 #include "pl2303.h" 32 33 34 #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0) 35 #define PL2303_QUIRK_LEGACY BIT(1) 36 37 static const struct usb_device_id id_table[] = { 38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) }, 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_PHAROS) }, 43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) }, 44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) }, 45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) }, 46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) }, 47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) }, 48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) }, 49 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, 50 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, 51 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) }, 52 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, 53 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, 54 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, 55 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, 56 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, 57 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, 58 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, 59 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, 60 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, 61 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, 62 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, 63 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, 64 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) }, 65 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1), 66 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 67 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65), 68 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 69 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75), 70 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, 71 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) }, 72 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */ 73 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) }, 74 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) }, 75 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) }, 76 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) }, 77 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) }, 78 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) }, 79 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) }, 80 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) }, 81 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) }, 82 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) }, 83 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) }, 84 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) }, 85 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) }, 86 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) }, 87 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) }, 88 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) }, 89 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) }, 90 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, 91 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, 92 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, 93 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, 94 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, 95 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, 96 { } /* Terminating entry */ 97 }; 98 99 MODULE_DEVICE_TABLE(usb, id_table); 100 101 #define SET_LINE_REQUEST_TYPE 0x21 102 #define SET_LINE_REQUEST 0x20 103 104 #define SET_CONTROL_REQUEST_TYPE 0x21 105 #define SET_CONTROL_REQUEST 0x22 106 #define CONTROL_DTR 0x01 107 #define CONTROL_RTS 0x02 108 109 #define BREAK_REQUEST_TYPE 0x21 110 #define BREAK_REQUEST 0x23 111 #define BREAK_ON 0xffff 112 #define BREAK_OFF 0x0000 113 114 #define GET_LINE_REQUEST_TYPE 0xa1 115 #define GET_LINE_REQUEST 0x21 116 117 #define VENDOR_WRITE_REQUEST_TYPE 0x40 118 #define VENDOR_WRITE_REQUEST 0x01 119 120 #define VENDOR_READ_REQUEST_TYPE 0xc0 121 #define VENDOR_READ_REQUEST 0x01 122 123 #define UART_STATE_INDEX 8 124 #define UART_STATE_MSR_MASK 0x8b 125 #define UART_STATE_TRANSIENT_MASK 0x74 126 #define UART_DCD 0x01 127 #define UART_DSR 0x02 128 #define UART_BREAK_ERROR 0x04 129 #define UART_RING 0x08 130 #define UART_FRAME_ERROR 0x10 131 #define UART_PARITY_ERROR 0x20 132 #define UART_OVERRUN_ERROR 0x40 133 #define UART_CTS 0x80 134 135 static void pl2303_set_break(struct usb_serial_port *port, bool enable); 136 137 enum pl2303_type { 138 TYPE_01, /* Type 0 and 1 (difference unknown) */ 139 TYPE_HX, /* HX version of the pl2303 chip */ 140 TYPE_COUNT 141 }; 142 143 struct pl2303_type_data { 144 speed_t max_baud_rate; 145 unsigned long quirks; 146 }; 147 148 struct pl2303_serial_private { 149 const struct pl2303_type_data *type; 150 unsigned long quirks; 151 }; 152 153 struct pl2303_private { 154 spinlock_t lock; 155 u8 line_control; 156 u8 line_status; 157 158 u8 line_settings[7]; 159 }; 160 161 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 162 [TYPE_01] = { 163 .max_baud_rate = 1228800, 164 .quirks = PL2303_QUIRK_LEGACY, 165 }, 166 [TYPE_HX] = { 167 .max_baud_rate = 12000000, 168 }, 169 }; 170 171 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 172 unsigned char buf[1]) 173 { 174 struct device *dev = &serial->interface->dev; 175 int res; 176 177 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 178 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE, 179 value, 0, buf, 1, 100); 180 if (res != 1) { 181 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 182 value, res); 183 if (res >= 0) 184 res = -EIO; 185 186 return res; 187 } 188 189 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 190 191 return 0; 192 } 193 194 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 195 { 196 struct device *dev = &serial->interface->dev; 197 int res; 198 199 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 200 201 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 202 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 203 value, index, NULL, 0, 100); 204 if (res) { 205 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 206 value, res); 207 return res; 208 } 209 210 return 0; 211 } 212 213 static int pl2303_probe(struct usb_serial *serial, 214 const struct usb_device_id *id) 215 { 216 usb_set_serial_data(serial, (void *)id->driver_info); 217 218 return 0; 219 } 220 221 static int pl2303_startup(struct usb_serial *serial) 222 { 223 struct pl2303_serial_private *spriv; 224 enum pl2303_type type = TYPE_01; 225 unsigned char *buf; 226 227 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 228 if (!spriv) 229 return -ENOMEM; 230 231 buf = kmalloc(1, GFP_KERNEL); 232 if (!buf) { 233 kfree(spriv); 234 return -ENOMEM; 235 } 236 237 if (serial->dev->descriptor.bDeviceClass == 0x02) 238 type = TYPE_01; /* type 0 */ 239 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) 240 type = TYPE_HX; 241 else if (serial->dev->descriptor.bDeviceClass == 0x00) 242 type = TYPE_01; /* type 1 */ 243 else if (serial->dev->descriptor.bDeviceClass == 0xFF) 244 type = TYPE_01; /* type 1 */ 245 dev_dbg(&serial->interface->dev, "device type: %d\n", type); 246 247 spriv->type = &pl2303_type_data[type]; 248 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 249 spriv->quirks |= spriv->type->quirks; 250 251 usb_set_serial_data(serial, spriv); 252 253 pl2303_vendor_read(serial, 0x8484, buf); 254 pl2303_vendor_write(serial, 0x0404, 0); 255 pl2303_vendor_read(serial, 0x8484, buf); 256 pl2303_vendor_read(serial, 0x8383, buf); 257 pl2303_vendor_read(serial, 0x8484, buf); 258 pl2303_vendor_write(serial, 0x0404, 1); 259 pl2303_vendor_read(serial, 0x8484, buf); 260 pl2303_vendor_read(serial, 0x8383, buf); 261 pl2303_vendor_write(serial, 0, 1); 262 pl2303_vendor_write(serial, 1, 0); 263 if (spriv->quirks & PL2303_QUIRK_LEGACY) 264 pl2303_vendor_write(serial, 2, 0x24); 265 else 266 pl2303_vendor_write(serial, 2, 0x44); 267 268 kfree(buf); 269 270 return 0; 271 } 272 273 static void pl2303_release(struct usb_serial *serial) 274 { 275 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 276 277 kfree(spriv); 278 } 279 280 static int pl2303_port_probe(struct usb_serial_port *port) 281 { 282 struct pl2303_private *priv; 283 284 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 285 if (!priv) 286 return -ENOMEM; 287 288 spin_lock_init(&priv->lock); 289 290 usb_set_serial_port_data(port, priv); 291 292 port->port.drain_delay = 256; 293 294 return 0; 295 } 296 297 static int pl2303_port_remove(struct usb_serial_port *port) 298 { 299 struct pl2303_private *priv = usb_get_serial_port_data(port); 300 301 kfree(priv); 302 303 return 0; 304 } 305 306 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 307 { 308 struct usb_device *dev = port->serial->dev; 309 int retval; 310 311 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 312 313 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 314 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 315 value, 0, NULL, 0, 100); 316 if (retval) 317 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 318 319 return retval; 320 } 321 322 /* 323 * Returns the nearest supported baud rate that can be set directly without 324 * using divisors. 325 */ 326 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 327 { 328 static const speed_t baud_sup[] = { 329 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 330 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 331 614400, 921600, 1228800, 2457600, 3000000, 6000000 332 }; 333 334 unsigned i; 335 336 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 337 if (baud_sup[i] > baud) 338 break; 339 } 340 341 if (i == ARRAY_SIZE(baud_sup)) 342 baud = baud_sup[i - 1]; 343 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 344 baud = baud_sup[i - 1]; 345 else 346 baud = baud_sup[i]; 347 348 return baud; 349 } 350 351 /* 352 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 353 * use 9600 baud. 354 */ 355 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 356 speed_t baud) 357 { 358 put_unaligned_le32(baud, buf); 359 360 return baud; 361 } 362 363 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 364 speed_t baud) 365 { 366 unsigned int tmp; 367 368 /* 369 * Apparently the formula is: 370 * baudrate = 12M * 32 / (2^buf[1]) / buf[0] 371 */ 372 tmp = 12000000 * 32 / baud; 373 buf[3] = 0x80; 374 buf[2] = 0; 375 buf[1] = (tmp >= 256); 376 while (tmp >= 256) { 377 tmp >>= 2; 378 buf[1] <<= 1; 379 } 380 buf[0] = tmp; 381 382 return baud; 383 } 384 385 static void pl2303_encode_baud_rate(struct tty_struct *tty, 386 struct usb_serial_port *port, 387 u8 buf[4]) 388 { 389 struct usb_serial *serial = port->serial; 390 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 391 speed_t baud_sup; 392 speed_t baud; 393 394 baud = tty_get_baud_rate(tty); 395 dev_dbg(&port->dev, "baud requested = %u\n", baud); 396 if (!baud) 397 return; 398 399 if (spriv->type->max_baud_rate) 400 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 401 /* 402 * Use direct method for supported baud rates, otherwise use divisors. 403 */ 404 baud_sup = pl2303_get_supported_baud_rate(baud); 405 406 if (baud == baud_sup) 407 baud = pl2303_encode_baud_rate_direct(buf, baud); 408 else 409 baud = pl2303_encode_baud_rate_divisor(buf, baud); 410 411 /* Save resulting baud rate */ 412 tty_encode_baud_rate(tty, baud, baud); 413 dev_dbg(&port->dev, "baud set = %u\n", baud); 414 } 415 416 static int pl2303_get_line_request(struct usb_serial_port *port, 417 unsigned char buf[7]) 418 { 419 struct usb_device *udev = port->serial->dev; 420 int ret; 421 422 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 423 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 424 0, 0, buf, 7, 100); 425 if (ret != 7) { 426 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 427 428 if (ret > 0) 429 ret = -EIO; 430 431 return ret; 432 } 433 434 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 435 436 return 0; 437 } 438 439 static int pl2303_set_line_request(struct usb_serial_port *port, 440 unsigned char buf[7]) 441 { 442 struct usb_device *udev = port->serial->dev; 443 int ret; 444 445 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 446 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 447 0, 0, buf, 7, 100); 448 if (ret != 7) { 449 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 450 451 if (ret > 0) 452 ret = -EIO; 453 454 return ret; 455 } 456 457 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 458 459 return 0; 460 } 461 462 static void pl2303_set_termios(struct tty_struct *tty, 463 struct usb_serial_port *port, struct ktermios *old_termios) 464 { 465 struct usb_serial *serial = port->serial; 466 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 467 struct pl2303_private *priv = usb_get_serial_port_data(port); 468 unsigned long flags; 469 unsigned char *buf; 470 int ret; 471 u8 control; 472 473 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 474 return; 475 476 buf = kzalloc(7, GFP_KERNEL); 477 if (!buf) { 478 /* Report back no change occurred */ 479 if (old_termios) 480 tty->termios = *old_termios; 481 return; 482 } 483 484 pl2303_get_line_request(port, buf); 485 486 switch (C_CSIZE(tty)) { 487 case CS5: 488 buf[6] = 5; 489 break; 490 case CS6: 491 buf[6] = 6; 492 break; 493 case CS7: 494 buf[6] = 7; 495 break; 496 default: 497 case CS8: 498 buf[6] = 8; 499 } 500 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 501 502 /* For reference buf[0]:buf[3] baud rate value */ 503 pl2303_encode_baud_rate(tty, port, &buf[0]); 504 505 /* For reference buf[4]=0 is 1 stop bits */ 506 /* For reference buf[4]=1 is 1.5 stop bits */ 507 /* For reference buf[4]=2 is 2 stop bits */ 508 if (C_CSTOPB(tty)) { 509 /* 510 * NOTE: Comply with "real" UARTs / RS232: 511 * use 1.5 instead of 2 stop bits with 5 data bits 512 */ 513 if (C_CSIZE(tty) == CS5) { 514 buf[4] = 1; 515 dev_dbg(&port->dev, "stop bits = 1.5\n"); 516 } else { 517 buf[4] = 2; 518 dev_dbg(&port->dev, "stop bits = 2\n"); 519 } 520 } else { 521 buf[4] = 0; 522 dev_dbg(&port->dev, "stop bits = 1\n"); 523 } 524 525 if (C_PARENB(tty)) { 526 /* For reference buf[5]=0 is none parity */ 527 /* For reference buf[5]=1 is odd parity */ 528 /* For reference buf[5]=2 is even parity */ 529 /* For reference buf[5]=3 is mark parity */ 530 /* For reference buf[5]=4 is space parity */ 531 if (C_PARODD(tty)) { 532 if (C_CMSPAR(tty)) { 533 buf[5] = 3; 534 dev_dbg(&port->dev, "parity = mark\n"); 535 } else { 536 buf[5] = 1; 537 dev_dbg(&port->dev, "parity = odd\n"); 538 } 539 } else { 540 if (C_CMSPAR(tty)) { 541 buf[5] = 4; 542 dev_dbg(&port->dev, "parity = space\n"); 543 } else { 544 buf[5] = 2; 545 dev_dbg(&port->dev, "parity = even\n"); 546 } 547 } 548 } else { 549 buf[5] = 0; 550 dev_dbg(&port->dev, "parity = none\n"); 551 } 552 553 /* 554 * Some PL2303 are known to lose bytes if you change serial settings 555 * even to the same values as before. Thus we actually need to filter 556 * in this specific case. 557 * 558 * Note that the tty_termios_hw_change check above is not sufficient 559 * as a previously requested baud rate may differ from the one 560 * actually used (and stored in old_termios). 561 * 562 * NOTE: No additional locking needed for line_settings as it is 563 * only used in set_termios, which is serialised against itself. 564 */ 565 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 566 ret = pl2303_set_line_request(port, buf); 567 if (!ret) 568 memcpy(priv->line_settings, buf, 7); 569 } 570 571 /* change control lines if we are switching to or from B0 */ 572 spin_lock_irqsave(&priv->lock, flags); 573 control = priv->line_control; 574 if (C_BAUD(tty) == B0) 575 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 576 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 577 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 578 if (control != priv->line_control) { 579 control = priv->line_control; 580 spin_unlock_irqrestore(&priv->lock, flags); 581 pl2303_set_control_lines(port, control); 582 } else { 583 spin_unlock_irqrestore(&priv->lock, flags); 584 } 585 586 if (C_CRTSCTS(tty)) { 587 if (spriv->quirks & PL2303_QUIRK_LEGACY) 588 pl2303_vendor_write(serial, 0x0, 0x41); 589 else 590 pl2303_vendor_write(serial, 0x0, 0x61); 591 } else { 592 pl2303_vendor_write(serial, 0x0, 0x0); 593 } 594 595 kfree(buf); 596 } 597 598 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 599 { 600 struct pl2303_private *priv = usb_get_serial_port_data(port); 601 unsigned long flags; 602 u8 control; 603 604 spin_lock_irqsave(&priv->lock, flags); 605 if (on) 606 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 607 else 608 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 609 control = priv->line_control; 610 spin_unlock_irqrestore(&priv->lock, flags); 611 612 pl2303_set_control_lines(port, control); 613 } 614 615 static void pl2303_close(struct usb_serial_port *port) 616 { 617 usb_serial_generic_close(port); 618 usb_kill_urb(port->interrupt_in_urb); 619 pl2303_set_break(port, false); 620 } 621 622 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 623 { 624 struct usb_serial *serial = port->serial; 625 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 626 int result; 627 628 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 629 usb_clear_halt(serial->dev, port->write_urb->pipe); 630 usb_clear_halt(serial->dev, port->read_urb->pipe); 631 } else { 632 /* reset upstream data pipes */ 633 pl2303_vendor_write(serial, 8, 0); 634 pl2303_vendor_write(serial, 9, 0); 635 } 636 637 /* Setup termios */ 638 if (tty) 639 pl2303_set_termios(tty, port, NULL); 640 641 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 642 if (result) { 643 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 644 result); 645 return result; 646 } 647 648 result = usb_serial_generic_open(tty, port); 649 if (result) { 650 usb_kill_urb(port->interrupt_in_urb); 651 return result; 652 } 653 654 return 0; 655 } 656 657 static int pl2303_tiocmset(struct tty_struct *tty, 658 unsigned int set, unsigned int clear) 659 { 660 struct usb_serial_port *port = tty->driver_data; 661 struct pl2303_private *priv = usb_get_serial_port_data(port); 662 unsigned long flags; 663 u8 control; 664 int ret; 665 666 spin_lock_irqsave(&priv->lock, flags); 667 if (set & TIOCM_RTS) 668 priv->line_control |= CONTROL_RTS; 669 if (set & TIOCM_DTR) 670 priv->line_control |= CONTROL_DTR; 671 if (clear & TIOCM_RTS) 672 priv->line_control &= ~CONTROL_RTS; 673 if (clear & TIOCM_DTR) 674 priv->line_control &= ~CONTROL_DTR; 675 control = priv->line_control; 676 spin_unlock_irqrestore(&priv->lock, flags); 677 678 ret = pl2303_set_control_lines(port, control); 679 if (ret) 680 return usb_translate_errors(ret); 681 682 return 0; 683 } 684 685 static int pl2303_tiocmget(struct tty_struct *tty) 686 { 687 struct usb_serial_port *port = tty->driver_data; 688 struct pl2303_private *priv = usb_get_serial_port_data(port); 689 unsigned long flags; 690 unsigned int mcr; 691 unsigned int status; 692 unsigned int result; 693 694 spin_lock_irqsave(&priv->lock, flags); 695 mcr = priv->line_control; 696 status = priv->line_status; 697 spin_unlock_irqrestore(&priv->lock, flags); 698 699 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 700 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 701 | ((status & UART_CTS) ? TIOCM_CTS : 0) 702 | ((status & UART_DSR) ? TIOCM_DSR : 0) 703 | ((status & UART_RING) ? TIOCM_RI : 0) 704 | ((status & UART_DCD) ? TIOCM_CD : 0); 705 706 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 707 708 return result; 709 } 710 711 static int pl2303_carrier_raised(struct usb_serial_port *port) 712 { 713 struct pl2303_private *priv = usb_get_serial_port_data(port); 714 715 if (priv->line_status & UART_DCD) 716 return 1; 717 718 return 0; 719 } 720 721 static int pl2303_ioctl(struct tty_struct *tty, 722 unsigned int cmd, unsigned long arg) 723 { 724 struct serial_struct ser; 725 struct usb_serial_port *port = tty->driver_data; 726 727 switch (cmd) { 728 case TIOCGSERIAL: 729 memset(&ser, 0, sizeof ser); 730 ser.type = PORT_16654; 731 ser.line = port->minor; 732 ser.port = port->port_number; 733 ser.baud_base = 460800; 734 735 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 736 return -EFAULT; 737 738 return 0; 739 default: 740 break; 741 } 742 743 return -ENOIOCTLCMD; 744 } 745 746 static void pl2303_set_break(struct usb_serial_port *port, bool enable) 747 { 748 struct usb_serial *serial = port->serial; 749 u16 state; 750 int result; 751 752 if (enable) 753 state = BREAK_ON; 754 else 755 state = BREAK_OFF; 756 757 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 758 state == BREAK_OFF ? "off" : "on"); 759 760 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 761 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 762 0, NULL, 0, 100); 763 if (result) 764 dev_err(&port->dev, "error sending break = %d\n", result); 765 } 766 767 static void pl2303_break_ctl(struct tty_struct *tty, int state) 768 { 769 struct usb_serial_port *port = tty->driver_data; 770 771 pl2303_set_break(port, state); 772 } 773 774 static void pl2303_update_line_status(struct usb_serial_port *port, 775 unsigned char *data, 776 unsigned int actual_length) 777 { 778 struct usb_serial *serial = port->serial; 779 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 780 struct pl2303_private *priv = usb_get_serial_port_data(port); 781 struct tty_struct *tty; 782 unsigned long flags; 783 unsigned int status_idx = UART_STATE_INDEX; 784 u8 status; 785 u8 delta; 786 787 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 788 status_idx = 0; 789 790 if (actual_length < status_idx + 1) 791 return; 792 793 status = data[status_idx]; 794 795 /* Save off the uart status for others to look at */ 796 spin_lock_irqsave(&priv->lock, flags); 797 delta = priv->line_status ^ status; 798 priv->line_status = status; 799 spin_unlock_irqrestore(&priv->lock, flags); 800 801 if (status & UART_BREAK_ERROR) 802 usb_serial_handle_break(port); 803 804 if (delta & UART_STATE_MSR_MASK) { 805 if (delta & UART_CTS) 806 port->icount.cts++; 807 if (delta & UART_DSR) 808 port->icount.dsr++; 809 if (delta & UART_RING) 810 port->icount.rng++; 811 if (delta & UART_DCD) { 812 port->icount.dcd++; 813 tty = tty_port_tty_get(&port->port); 814 if (tty) { 815 usb_serial_handle_dcd_change(port, tty, 816 status & UART_DCD); 817 tty_kref_put(tty); 818 } 819 } 820 821 wake_up_interruptible(&port->port.delta_msr_wait); 822 } 823 } 824 825 static void pl2303_read_int_callback(struct urb *urb) 826 { 827 struct usb_serial_port *port = urb->context; 828 unsigned char *data = urb->transfer_buffer; 829 unsigned int actual_length = urb->actual_length; 830 int status = urb->status; 831 int retval; 832 833 switch (status) { 834 case 0: 835 /* success */ 836 break; 837 case -ECONNRESET: 838 case -ENOENT: 839 case -ESHUTDOWN: 840 /* this urb is terminated, clean up */ 841 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 842 __func__, status); 843 return; 844 default: 845 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 846 __func__, status); 847 goto exit; 848 } 849 850 usb_serial_debug_data(&port->dev, __func__, 851 urb->actual_length, urb->transfer_buffer); 852 853 pl2303_update_line_status(port, data, actual_length); 854 855 exit: 856 retval = usb_submit_urb(urb, GFP_ATOMIC); 857 if (retval) { 858 dev_err(&port->dev, 859 "%s - usb_submit_urb failed with result %d\n", 860 __func__, retval); 861 } 862 } 863 864 static void pl2303_process_read_urb(struct urb *urb) 865 { 866 struct usb_serial_port *port = urb->context; 867 struct pl2303_private *priv = usb_get_serial_port_data(port); 868 unsigned char *data = urb->transfer_buffer; 869 char tty_flag = TTY_NORMAL; 870 unsigned long flags; 871 u8 line_status; 872 int i; 873 874 /* update line status */ 875 spin_lock_irqsave(&priv->lock, flags); 876 line_status = priv->line_status; 877 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 878 spin_unlock_irqrestore(&priv->lock, flags); 879 880 if (!urb->actual_length) 881 return; 882 883 /* 884 * Break takes precedence over parity, which takes precedence over 885 * framing errors. 886 */ 887 if (line_status & UART_BREAK_ERROR) 888 tty_flag = TTY_BREAK; 889 else if (line_status & UART_PARITY_ERROR) 890 tty_flag = TTY_PARITY; 891 else if (line_status & UART_FRAME_ERROR) 892 tty_flag = TTY_FRAME; 893 894 if (tty_flag != TTY_NORMAL) 895 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 896 tty_flag); 897 /* overrun is special, not associated with a char */ 898 if (line_status & UART_OVERRUN_ERROR) 899 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 900 901 if (port->port.console && port->sysrq) { 902 for (i = 0; i < urb->actual_length; ++i) 903 if (!usb_serial_handle_sysrq_char(port, data[i])) 904 tty_insert_flip_char(&port->port, data[i], 905 tty_flag); 906 } else { 907 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 908 urb->actual_length); 909 } 910 911 tty_flip_buffer_push(&port->port); 912 } 913 914 static struct usb_serial_driver pl2303_device = { 915 .driver = { 916 .owner = THIS_MODULE, 917 .name = "pl2303", 918 }, 919 .id_table = id_table, 920 .num_ports = 1, 921 .bulk_in_size = 256, 922 .bulk_out_size = 256, 923 .open = pl2303_open, 924 .close = pl2303_close, 925 .dtr_rts = pl2303_dtr_rts, 926 .carrier_raised = pl2303_carrier_raised, 927 .ioctl = pl2303_ioctl, 928 .break_ctl = pl2303_break_ctl, 929 .set_termios = pl2303_set_termios, 930 .tiocmget = pl2303_tiocmget, 931 .tiocmset = pl2303_tiocmset, 932 .tiocmiwait = usb_serial_generic_tiocmiwait, 933 .process_read_urb = pl2303_process_read_urb, 934 .read_int_callback = pl2303_read_int_callback, 935 .probe = pl2303_probe, 936 .attach = pl2303_startup, 937 .release = pl2303_release, 938 .port_probe = pl2303_port_probe, 939 .port_remove = pl2303_port_remove, 940 }; 941 942 static struct usb_serial_driver * const serial_drivers[] = { 943 &pl2303_device, NULL 944 }; 945 946 module_usb_serial_driver(serial_drivers, id_table); 947 948 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 949 MODULE_LICENSE("GPL"); 950