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 134 135 136 enum pl2303_type { 137 TYPE_01, /* Type 0 and 1 (difference unknown) */ 138 TYPE_HX, /* HX version of the pl2303 chip */ 139 TYPE_COUNT 140 }; 141 142 struct pl2303_type_data { 143 speed_t max_baud_rate; 144 unsigned long quirks; 145 }; 146 147 struct pl2303_serial_private { 148 const struct pl2303_type_data *type; 149 unsigned long quirks; 150 }; 151 152 struct pl2303_private { 153 spinlock_t lock; 154 u8 line_control; 155 u8 line_status; 156 157 u8 line_settings[7]; 158 }; 159 160 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 161 [TYPE_01] = { 162 .max_baud_rate = 1228800, 163 .quirks = PL2303_QUIRK_LEGACY, 164 }, 165 }; 166 167 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 168 unsigned char buf[1]) 169 { 170 struct device *dev = &serial->interface->dev; 171 int res; 172 173 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 174 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE, 175 value, 0, buf, 1, 100); 176 if (res != 1) { 177 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 178 value, res); 179 if (res >= 0) 180 res = -EIO; 181 182 return res; 183 } 184 185 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 186 187 return 0; 188 } 189 190 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 191 { 192 struct device *dev = &serial->interface->dev; 193 int res; 194 195 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 196 197 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 198 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 199 value, index, NULL, 0, 100); 200 if (res) { 201 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 202 value, res); 203 return res; 204 } 205 206 return 0; 207 } 208 209 static int pl2303_probe(struct usb_serial *serial, 210 const struct usb_device_id *id) 211 { 212 usb_set_serial_data(serial, (void *)id->driver_info); 213 214 return 0; 215 } 216 217 static int pl2303_startup(struct usb_serial *serial) 218 { 219 struct pl2303_serial_private *spriv; 220 enum pl2303_type type = TYPE_01; 221 unsigned char *buf; 222 223 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 224 if (!spriv) 225 return -ENOMEM; 226 227 buf = kmalloc(1, GFP_KERNEL); 228 if (!buf) { 229 kfree(spriv); 230 return -ENOMEM; 231 } 232 233 if (serial->dev->descriptor.bDeviceClass == 0x02) 234 type = TYPE_01; /* type 0 */ 235 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) 236 type = TYPE_HX; 237 else if (serial->dev->descriptor.bDeviceClass == 0x00) 238 type = TYPE_01; /* type 1 */ 239 else if (serial->dev->descriptor.bDeviceClass == 0xFF) 240 type = TYPE_01; /* type 1 */ 241 dev_dbg(&serial->interface->dev, "device type: %d\n", type); 242 243 spriv->type = &pl2303_type_data[type]; 244 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 245 spriv->quirks |= spriv->type->quirks; 246 247 usb_set_serial_data(serial, spriv); 248 249 pl2303_vendor_read(serial, 0x8484, buf); 250 pl2303_vendor_write(serial, 0x0404, 0); 251 pl2303_vendor_read(serial, 0x8484, buf); 252 pl2303_vendor_read(serial, 0x8383, buf); 253 pl2303_vendor_read(serial, 0x8484, buf); 254 pl2303_vendor_write(serial, 0x0404, 1); 255 pl2303_vendor_read(serial, 0x8484, buf); 256 pl2303_vendor_read(serial, 0x8383, buf); 257 pl2303_vendor_write(serial, 0, 1); 258 pl2303_vendor_write(serial, 1, 0); 259 if (spriv->quirks & PL2303_QUIRK_LEGACY) 260 pl2303_vendor_write(serial, 2, 0x24); 261 else 262 pl2303_vendor_write(serial, 2, 0x44); 263 264 kfree(buf); 265 266 return 0; 267 } 268 269 static void pl2303_release(struct usb_serial *serial) 270 { 271 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 272 273 kfree(spriv); 274 } 275 276 static int pl2303_port_probe(struct usb_serial_port *port) 277 { 278 struct pl2303_private *priv; 279 280 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 281 if (!priv) 282 return -ENOMEM; 283 284 spin_lock_init(&priv->lock); 285 286 usb_set_serial_port_data(port, priv); 287 288 port->port.drain_delay = 256; 289 290 return 0; 291 } 292 293 static int pl2303_port_remove(struct usb_serial_port *port) 294 { 295 struct pl2303_private *priv = usb_get_serial_port_data(port); 296 297 kfree(priv); 298 299 return 0; 300 } 301 302 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 303 { 304 struct usb_device *dev = port->serial->dev; 305 int retval; 306 307 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 308 309 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 310 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 311 value, 0, NULL, 0, 100); 312 if (retval) 313 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 314 315 return retval; 316 } 317 318 /* 319 * Returns the nearest supported baud rate that can be set directly without 320 * using divisors. 321 */ 322 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 323 { 324 static const speed_t baud_sup[] = { 325 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 326 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 327 614400, 921600, 1228800, 2457600, 3000000, 6000000 328 }; 329 330 unsigned i; 331 332 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 333 if (baud_sup[i] > baud) 334 break; 335 } 336 337 if (i == ARRAY_SIZE(baud_sup)) 338 baud = baud_sup[i - 1]; 339 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 340 baud = baud_sup[i - 1]; 341 else 342 baud = baud_sup[i]; 343 344 return baud; 345 } 346 347 /* 348 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 349 * use 9600 baud. 350 */ 351 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 352 speed_t baud) 353 { 354 put_unaligned_le32(baud, buf); 355 356 return baud; 357 } 358 359 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 360 speed_t baud) 361 { 362 unsigned int tmp; 363 364 /* 365 * Apparently the formula is: 366 * baudrate = 12M * 32 / (2^buf[1]) / buf[0] 367 */ 368 tmp = 12000000 * 32 / baud; 369 buf[3] = 0x80; 370 buf[2] = 0; 371 buf[1] = (tmp >= 256); 372 while (tmp >= 256) { 373 tmp >>= 2; 374 buf[1] <<= 1; 375 } 376 buf[0] = tmp; 377 378 return baud; 379 } 380 381 static void pl2303_encode_baud_rate(struct tty_struct *tty, 382 struct usb_serial_port *port, 383 u8 buf[4]) 384 { 385 struct usb_serial *serial = port->serial; 386 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 387 speed_t baud_sup; 388 speed_t baud; 389 390 baud = tty_get_baud_rate(tty); 391 dev_dbg(&port->dev, "baud requested = %u\n", baud); 392 if (!baud) 393 return; 394 395 if (spriv->type->max_baud_rate) 396 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 397 /* 398 * Set baud rate to nearest supported value. 399 * 400 * NOTE: Baud rate 500k can only be set using divisors. 401 */ 402 baud_sup = pl2303_get_supported_baud_rate(baud); 403 404 if (baud == 500000) 405 baud = pl2303_encode_baud_rate_divisor(buf, baud); 406 else 407 baud = pl2303_encode_baud_rate_direct(buf, baud_sup); 408 409 /* Save resulting baud rate */ 410 tty_encode_baud_rate(tty, baud, baud); 411 dev_dbg(&port->dev, "baud set = %u\n", baud); 412 } 413 414 static int pl2303_get_line_request(struct usb_serial_port *port, 415 unsigned char buf[7]) 416 { 417 struct usb_device *udev = port->serial->dev; 418 int ret; 419 420 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 421 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 422 0, 0, buf, 7, 100); 423 if (ret != 7) { 424 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 425 426 if (ret > 0) 427 ret = -EIO; 428 429 return ret; 430 } 431 432 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 433 434 return 0; 435 } 436 437 static int pl2303_set_line_request(struct usb_serial_port *port, 438 unsigned char buf[7]) 439 { 440 struct usb_device *udev = port->serial->dev; 441 int ret; 442 443 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 444 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 445 0, 0, buf, 7, 100); 446 if (ret != 7) { 447 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 448 449 if (ret > 0) 450 ret = -EIO; 451 452 return ret; 453 } 454 455 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 456 457 return 0; 458 } 459 460 static void pl2303_set_termios(struct tty_struct *tty, 461 struct usb_serial_port *port, struct ktermios *old_termios) 462 { 463 struct usb_serial *serial = port->serial; 464 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 465 struct pl2303_private *priv = usb_get_serial_port_data(port); 466 unsigned long flags; 467 unsigned char *buf; 468 int ret; 469 u8 control; 470 471 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 472 return; 473 474 buf = kzalloc(7, GFP_KERNEL); 475 if (!buf) { 476 /* Report back no change occurred */ 477 if (old_termios) 478 tty->termios = *old_termios; 479 return; 480 } 481 482 pl2303_get_line_request(port, buf); 483 484 switch (C_CSIZE(tty)) { 485 case CS5: 486 buf[6] = 5; 487 break; 488 case CS6: 489 buf[6] = 6; 490 break; 491 case CS7: 492 buf[6] = 7; 493 break; 494 default: 495 case CS8: 496 buf[6] = 8; 497 } 498 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 499 500 /* For reference buf[0]:buf[3] baud rate value */ 501 pl2303_encode_baud_rate(tty, port, &buf[0]); 502 503 /* For reference buf[4]=0 is 1 stop bits */ 504 /* For reference buf[4]=1 is 1.5 stop bits */ 505 /* For reference buf[4]=2 is 2 stop bits */ 506 if (C_CSTOPB(tty)) { 507 /* 508 * NOTE: Comply with "real" UARTs / RS232: 509 * use 1.5 instead of 2 stop bits with 5 data bits 510 */ 511 if (C_CSIZE(tty) == CS5) { 512 buf[4] = 1; 513 dev_dbg(&port->dev, "stop bits = 1.5\n"); 514 } else { 515 buf[4] = 2; 516 dev_dbg(&port->dev, "stop bits = 2\n"); 517 } 518 } else { 519 buf[4] = 0; 520 dev_dbg(&port->dev, "stop bits = 1\n"); 521 } 522 523 if (C_PARENB(tty)) { 524 /* For reference buf[5]=0 is none parity */ 525 /* For reference buf[5]=1 is odd parity */ 526 /* For reference buf[5]=2 is even parity */ 527 /* For reference buf[5]=3 is mark parity */ 528 /* For reference buf[5]=4 is space parity */ 529 if (C_PARODD(tty)) { 530 if (C_CMSPAR(tty)) { 531 buf[5] = 3; 532 dev_dbg(&port->dev, "parity = mark\n"); 533 } else { 534 buf[5] = 1; 535 dev_dbg(&port->dev, "parity = odd\n"); 536 } 537 } else { 538 if (C_CMSPAR(tty)) { 539 buf[5] = 4; 540 dev_dbg(&port->dev, "parity = space\n"); 541 } else { 542 buf[5] = 2; 543 dev_dbg(&port->dev, "parity = even\n"); 544 } 545 } 546 } else { 547 buf[5] = 0; 548 dev_dbg(&port->dev, "parity = none\n"); 549 } 550 551 /* 552 * Some PL2303 are known to lose bytes if you change serial settings 553 * even to the same values as before. Thus we actually need to filter 554 * in this specific case. 555 * 556 * Note that the tty_termios_hw_change check above is not sufficient 557 * as a previously requested baud rate may differ from the one 558 * actually used (and stored in old_termios). 559 * 560 * NOTE: No additional locking needed for line_settings as it is 561 * only used in set_termios, which is serialised against itself. 562 */ 563 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 564 ret = pl2303_set_line_request(port, buf); 565 if (!ret) 566 memcpy(priv->line_settings, buf, 7); 567 } 568 569 /* change control lines if we are switching to or from B0 */ 570 spin_lock_irqsave(&priv->lock, flags); 571 control = priv->line_control; 572 if (C_BAUD(tty) == B0) 573 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 574 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 575 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 576 if (control != priv->line_control) { 577 control = priv->line_control; 578 spin_unlock_irqrestore(&priv->lock, flags); 579 pl2303_set_control_lines(port, control); 580 } else { 581 spin_unlock_irqrestore(&priv->lock, flags); 582 } 583 584 if (C_CRTSCTS(tty)) { 585 if (spriv->quirks & PL2303_QUIRK_LEGACY) 586 pl2303_vendor_write(serial, 0x0, 0x41); 587 else 588 pl2303_vendor_write(serial, 0x0, 0x61); 589 } else { 590 pl2303_vendor_write(serial, 0x0, 0x0); 591 } 592 593 kfree(buf); 594 } 595 596 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 597 { 598 struct pl2303_private *priv = usb_get_serial_port_data(port); 599 unsigned long flags; 600 u8 control; 601 602 spin_lock_irqsave(&priv->lock, flags); 603 if (on) 604 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 605 else 606 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 607 control = priv->line_control; 608 spin_unlock_irqrestore(&priv->lock, flags); 609 610 pl2303_set_control_lines(port, control); 611 } 612 613 static void pl2303_close(struct usb_serial_port *port) 614 { 615 usb_serial_generic_close(port); 616 usb_kill_urb(port->interrupt_in_urb); 617 } 618 619 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 620 { 621 struct usb_serial *serial = port->serial; 622 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 623 int result; 624 625 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 626 usb_clear_halt(serial->dev, port->write_urb->pipe); 627 usb_clear_halt(serial->dev, port->read_urb->pipe); 628 } else { 629 /* reset upstream data pipes */ 630 pl2303_vendor_write(serial, 8, 0); 631 pl2303_vendor_write(serial, 9, 0); 632 } 633 634 /* Setup termios */ 635 if (tty) 636 pl2303_set_termios(tty, port, NULL); 637 638 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 639 if (result) { 640 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 641 result); 642 return result; 643 } 644 645 result = usb_serial_generic_open(tty, port); 646 if (result) { 647 usb_kill_urb(port->interrupt_in_urb); 648 return result; 649 } 650 651 return 0; 652 } 653 654 static int pl2303_tiocmset(struct tty_struct *tty, 655 unsigned int set, unsigned int clear) 656 { 657 struct usb_serial_port *port = tty->driver_data; 658 struct pl2303_private *priv = usb_get_serial_port_data(port); 659 unsigned long flags; 660 u8 control; 661 int ret; 662 663 spin_lock_irqsave(&priv->lock, flags); 664 if (set & TIOCM_RTS) 665 priv->line_control |= CONTROL_RTS; 666 if (set & TIOCM_DTR) 667 priv->line_control |= CONTROL_DTR; 668 if (clear & TIOCM_RTS) 669 priv->line_control &= ~CONTROL_RTS; 670 if (clear & TIOCM_DTR) 671 priv->line_control &= ~CONTROL_DTR; 672 control = priv->line_control; 673 spin_unlock_irqrestore(&priv->lock, flags); 674 675 ret = pl2303_set_control_lines(port, control); 676 if (ret) 677 return usb_translate_errors(ret); 678 679 return 0; 680 } 681 682 static int pl2303_tiocmget(struct tty_struct *tty) 683 { 684 struct usb_serial_port *port = tty->driver_data; 685 struct pl2303_private *priv = usb_get_serial_port_data(port); 686 unsigned long flags; 687 unsigned int mcr; 688 unsigned int status; 689 unsigned int result; 690 691 spin_lock_irqsave(&priv->lock, flags); 692 mcr = priv->line_control; 693 status = priv->line_status; 694 spin_unlock_irqrestore(&priv->lock, flags); 695 696 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 697 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 698 | ((status & UART_CTS) ? TIOCM_CTS : 0) 699 | ((status & UART_DSR) ? TIOCM_DSR : 0) 700 | ((status & UART_RING) ? TIOCM_RI : 0) 701 | ((status & UART_DCD) ? TIOCM_CD : 0); 702 703 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 704 705 return result; 706 } 707 708 static int pl2303_carrier_raised(struct usb_serial_port *port) 709 { 710 struct pl2303_private *priv = usb_get_serial_port_data(port); 711 712 if (priv->line_status & UART_DCD) 713 return 1; 714 715 return 0; 716 } 717 718 static int pl2303_ioctl(struct tty_struct *tty, 719 unsigned int cmd, unsigned long arg) 720 { 721 struct serial_struct ser; 722 struct usb_serial_port *port = tty->driver_data; 723 724 switch (cmd) { 725 case TIOCGSERIAL: 726 memset(&ser, 0, sizeof ser); 727 ser.type = PORT_16654; 728 ser.line = port->minor; 729 ser.port = port->port_number; 730 ser.baud_base = 460800; 731 732 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 733 return -EFAULT; 734 735 return 0; 736 default: 737 break; 738 } 739 740 return -ENOIOCTLCMD; 741 } 742 743 static void pl2303_break_ctl(struct tty_struct *tty, int break_state) 744 { 745 struct usb_serial_port *port = tty->driver_data; 746 struct usb_serial *serial = port->serial; 747 u16 state; 748 int result; 749 750 if (break_state == 0) 751 state = BREAK_OFF; 752 else 753 state = BREAK_ON; 754 755 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 756 state == BREAK_OFF ? "off" : "on"); 757 758 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 759 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 760 0, NULL, 0, 100); 761 if (result) 762 dev_err(&port->dev, "error sending break = %d\n", result); 763 } 764 765 static void pl2303_update_line_status(struct usb_serial_port *port, 766 unsigned char *data, 767 unsigned int actual_length) 768 { 769 struct usb_serial *serial = port->serial; 770 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 771 struct pl2303_private *priv = usb_get_serial_port_data(port); 772 struct tty_struct *tty; 773 unsigned long flags; 774 unsigned int status_idx = UART_STATE_INDEX; 775 u8 status; 776 u8 delta; 777 778 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 779 status_idx = 0; 780 781 if (actual_length < status_idx + 1) 782 return; 783 784 status = data[status_idx]; 785 786 /* Save off the uart status for others to look at */ 787 spin_lock_irqsave(&priv->lock, flags); 788 delta = priv->line_status ^ status; 789 priv->line_status = status; 790 spin_unlock_irqrestore(&priv->lock, flags); 791 792 if (status & UART_BREAK_ERROR) 793 usb_serial_handle_break(port); 794 795 if (delta & UART_STATE_MSR_MASK) { 796 if (delta & UART_CTS) 797 port->icount.cts++; 798 if (delta & UART_DSR) 799 port->icount.dsr++; 800 if (delta & UART_RING) 801 port->icount.rng++; 802 if (delta & UART_DCD) { 803 port->icount.dcd++; 804 tty = tty_port_tty_get(&port->port); 805 if (tty) { 806 usb_serial_handle_dcd_change(port, tty, 807 status & UART_DCD); 808 tty_kref_put(tty); 809 } 810 } 811 812 wake_up_interruptible(&port->port.delta_msr_wait); 813 } 814 } 815 816 static void pl2303_read_int_callback(struct urb *urb) 817 { 818 struct usb_serial_port *port = urb->context; 819 unsigned char *data = urb->transfer_buffer; 820 unsigned int actual_length = urb->actual_length; 821 int status = urb->status; 822 int retval; 823 824 switch (status) { 825 case 0: 826 /* success */ 827 break; 828 case -ECONNRESET: 829 case -ENOENT: 830 case -ESHUTDOWN: 831 /* this urb is terminated, clean up */ 832 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 833 __func__, status); 834 return; 835 default: 836 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 837 __func__, status); 838 goto exit; 839 } 840 841 usb_serial_debug_data(&port->dev, __func__, 842 urb->actual_length, urb->transfer_buffer); 843 844 pl2303_update_line_status(port, data, actual_length); 845 846 exit: 847 retval = usb_submit_urb(urb, GFP_ATOMIC); 848 if (retval) { 849 dev_err(&port->dev, 850 "%s - usb_submit_urb failed with result %d\n", 851 __func__, retval); 852 } 853 } 854 855 static void pl2303_process_read_urb(struct urb *urb) 856 { 857 struct usb_serial_port *port = urb->context; 858 struct pl2303_private *priv = usb_get_serial_port_data(port); 859 unsigned char *data = urb->transfer_buffer; 860 char tty_flag = TTY_NORMAL; 861 unsigned long flags; 862 u8 line_status; 863 int i; 864 865 /* update line status */ 866 spin_lock_irqsave(&priv->lock, flags); 867 line_status = priv->line_status; 868 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 869 spin_unlock_irqrestore(&priv->lock, flags); 870 871 if (!urb->actual_length) 872 return; 873 874 /* 875 * Break takes precedence over parity, which takes precedence over 876 * framing errors. 877 */ 878 if (line_status & UART_BREAK_ERROR) 879 tty_flag = TTY_BREAK; 880 else if (line_status & UART_PARITY_ERROR) 881 tty_flag = TTY_PARITY; 882 else if (line_status & UART_FRAME_ERROR) 883 tty_flag = TTY_FRAME; 884 885 if (tty_flag != TTY_NORMAL) 886 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 887 tty_flag); 888 /* overrun is special, not associated with a char */ 889 if (line_status & UART_OVERRUN_ERROR) 890 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 891 892 if (port->port.console && port->sysrq) { 893 for (i = 0; i < urb->actual_length; ++i) 894 if (!usb_serial_handle_sysrq_char(port, data[i])) 895 tty_insert_flip_char(&port->port, data[i], 896 tty_flag); 897 } else { 898 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 899 urb->actual_length); 900 } 901 902 tty_flip_buffer_push(&port->port); 903 } 904 905 static struct usb_serial_driver pl2303_device = { 906 .driver = { 907 .owner = THIS_MODULE, 908 .name = "pl2303", 909 }, 910 .id_table = id_table, 911 .num_ports = 1, 912 .bulk_in_size = 256, 913 .bulk_out_size = 256, 914 .open = pl2303_open, 915 .close = pl2303_close, 916 .dtr_rts = pl2303_dtr_rts, 917 .carrier_raised = pl2303_carrier_raised, 918 .ioctl = pl2303_ioctl, 919 .break_ctl = pl2303_break_ctl, 920 .set_termios = pl2303_set_termios, 921 .tiocmget = pl2303_tiocmget, 922 .tiocmset = pl2303_tiocmset, 923 .tiocmiwait = usb_serial_generic_tiocmiwait, 924 .process_read_urb = pl2303_process_read_urb, 925 .read_int_callback = pl2303_read_int_callback, 926 .probe = pl2303_probe, 927 .attach = pl2303_startup, 928 .release = pl2303_release, 929 .port_probe = pl2303_port_probe, 930 .port_remove = pl2303_port_remove, 931 }; 932 933 static struct usb_serial_driver * const serial_drivers[] = { 934 &pl2303_device, NULL 935 }; 936 937 module_usb_serial_driver(serial_drivers, id_table); 938 939 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 940 MODULE_LICENSE("GPL"); 941