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/init.h> 20 #include <linux/slab.h> 21 #include <linux/tty.h> 22 #include <linux/tty_driver.h> 23 #include <linux/tty_flip.h> 24 #include <linux/serial.h> 25 #include <linux/module.h> 26 #include <linux/moduleparam.h> 27 #include <linux/spinlock.h> 28 #include <linux/uaccess.h> 29 #include <linux/usb.h> 30 #include <linux/usb/serial.h> 31 #include <asm/unaligned.h> 32 #include "pl2303.h" 33 34 35 #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0) 36 #define PL2303_QUIRK_LEGACY BIT(1) 37 38 static const struct usb_device_id id_table[] = { 39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) }, 40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) }, 41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) }, 42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) }, 43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) }, 44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) }, 45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) }, 46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) }, 47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) }, 48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) }, 49 { USB_DEVICE(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(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, 88 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, 89 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, 90 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, 91 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, 92 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, 93 { } /* Terminating entry */ 94 }; 95 96 MODULE_DEVICE_TABLE(usb, id_table); 97 98 #define SET_LINE_REQUEST_TYPE 0x21 99 #define SET_LINE_REQUEST 0x20 100 101 #define SET_CONTROL_REQUEST_TYPE 0x21 102 #define SET_CONTROL_REQUEST 0x22 103 #define CONTROL_DTR 0x01 104 #define CONTROL_RTS 0x02 105 106 #define BREAK_REQUEST_TYPE 0x21 107 #define BREAK_REQUEST 0x23 108 #define BREAK_ON 0xffff 109 #define BREAK_OFF 0x0000 110 111 #define GET_LINE_REQUEST_TYPE 0xa1 112 #define GET_LINE_REQUEST 0x21 113 114 #define VENDOR_WRITE_REQUEST_TYPE 0x40 115 #define VENDOR_WRITE_REQUEST 0x01 116 117 #define VENDOR_READ_REQUEST_TYPE 0xc0 118 #define VENDOR_READ_REQUEST 0x01 119 120 #define UART_STATE_INDEX 8 121 #define UART_STATE_MSR_MASK 0x8b 122 #define UART_STATE_TRANSIENT_MASK 0x74 123 #define UART_DCD 0x01 124 #define UART_DSR 0x02 125 #define UART_BREAK_ERROR 0x04 126 #define UART_RING 0x08 127 #define UART_FRAME_ERROR 0x10 128 #define UART_PARITY_ERROR 0x20 129 #define UART_OVERRUN_ERROR 0x40 130 #define UART_CTS 0x80 131 132 133 enum pl2303_type { 134 TYPE_01, /* Type 0 and 1 (difference unknown) */ 135 TYPE_HX, /* HX version of the pl2303 chip */ 136 TYPE_COUNT 137 }; 138 139 struct pl2303_type_data { 140 speed_t max_baud_rate; 141 unsigned long quirks; 142 }; 143 144 struct pl2303_serial_private { 145 const struct pl2303_type_data *type; 146 unsigned long quirks; 147 }; 148 149 struct pl2303_private { 150 spinlock_t lock; 151 u8 line_control; 152 u8 line_status; 153 154 u8 line_settings[7]; 155 }; 156 157 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 158 [TYPE_01] = { 159 .max_baud_rate = 1228800, 160 .quirks = PL2303_QUIRK_LEGACY, 161 }, 162 }; 163 164 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 165 unsigned char buf[1]) 166 { 167 struct device *dev = &serial->interface->dev; 168 int res; 169 170 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 171 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE, 172 value, 0, buf, 1, 100); 173 if (res != 1) { 174 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 175 value, res); 176 if (res >= 0) 177 res = -EIO; 178 179 return res; 180 } 181 182 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 183 184 return 0; 185 } 186 187 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 188 { 189 struct device *dev = &serial->interface->dev; 190 int res; 191 192 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 193 194 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 195 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 196 value, index, NULL, 0, 100); 197 if (res) { 198 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 199 value, res); 200 return res; 201 } 202 203 return 0; 204 } 205 206 static int pl2303_probe(struct usb_serial *serial, 207 const struct usb_device_id *id) 208 { 209 usb_set_serial_data(serial, (void *)id->driver_info); 210 211 return 0; 212 } 213 214 static int pl2303_startup(struct usb_serial *serial) 215 { 216 struct pl2303_serial_private *spriv; 217 enum pl2303_type type = TYPE_01; 218 unsigned char *buf; 219 220 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 221 if (!spriv) 222 return -ENOMEM; 223 224 buf = kmalloc(1, GFP_KERNEL); 225 if (!buf) { 226 kfree(spriv); 227 return -ENOMEM; 228 } 229 230 if (serial->dev->descriptor.bDeviceClass == 0x02) 231 type = TYPE_01; /* type 0 */ 232 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) 233 type = TYPE_HX; 234 else if (serial->dev->descriptor.bDeviceClass == 0x00) 235 type = TYPE_01; /* type 1 */ 236 else if (serial->dev->descriptor.bDeviceClass == 0xFF) 237 type = TYPE_01; /* type 1 */ 238 dev_dbg(&serial->interface->dev, "device type: %d\n", type); 239 240 spriv->type = &pl2303_type_data[type]; 241 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 242 spriv->quirks |= spriv->type->quirks; 243 244 usb_set_serial_data(serial, spriv); 245 246 pl2303_vendor_read(serial, 0x8484, buf); 247 pl2303_vendor_write(serial, 0x0404, 0); 248 pl2303_vendor_read(serial, 0x8484, buf); 249 pl2303_vendor_read(serial, 0x8383, buf); 250 pl2303_vendor_read(serial, 0x8484, buf); 251 pl2303_vendor_write(serial, 0x0404, 1); 252 pl2303_vendor_read(serial, 0x8484, buf); 253 pl2303_vendor_read(serial, 0x8383, buf); 254 pl2303_vendor_write(serial, 0, 1); 255 pl2303_vendor_write(serial, 1, 0); 256 if (spriv->quirks & PL2303_QUIRK_LEGACY) 257 pl2303_vendor_write(serial, 2, 0x24); 258 else 259 pl2303_vendor_write(serial, 2, 0x44); 260 261 kfree(buf); 262 263 return 0; 264 } 265 266 static void pl2303_release(struct usb_serial *serial) 267 { 268 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 269 270 kfree(spriv); 271 } 272 273 static int pl2303_port_probe(struct usb_serial_port *port) 274 { 275 struct pl2303_private *priv; 276 277 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 278 if (!priv) 279 return -ENOMEM; 280 281 spin_lock_init(&priv->lock); 282 283 usb_set_serial_port_data(port, priv); 284 285 port->port.drain_delay = 256; 286 287 return 0; 288 } 289 290 static int pl2303_port_remove(struct usb_serial_port *port) 291 { 292 struct pl2303_private *priv = usb_get_serial_port_data(port); 293 294 kfree(priv); 295 296 return 0; 297 } 298 299 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 300 { 301 struct usb_device *dev = port->serial->dev; 302 int retval; 303 304 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 305 306 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 307 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 308 value, 0, NULL, 0, 100); 309 if (retval) 310 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 311 312 return retval; 313 } 314 315 /* 316 * Returns the nearest supported baud rate that can be set directly without 317 * using divisors. 318 */ 319 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 320 { 321 static const speed_t baud_sup[] = { 322 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 323 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 324 614400, 921600, 1228800, 2457600, 3000000, 6000000 325 }; 326 327 unsigned i; 328 329 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 330 if (baud_sup[i] > baud) 331 break; 332 } 333 334 if (i == ARRAY_SIZE(baud_sup)) 335 baud = baud_sup[i - 1]; 336 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 337 baud = baud_sup[i - 1]; 338 else 339 baud = baud_sup[i]; 340 341 return baud; 342 } 343 344 /* 345 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 346 * use 9600 baud. 347 */ 348 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 349 speed_t baud) 350 { 351 put_unaligned_le32(baud, buf); 352 353 return baud; 354 } 355 356 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 357 speed_t baud) 358 { 359 unsigned int tmp; 360 361 /* 362 * Apparently the formula is: 363 * baudrate = 12M * 32 / (2^buf[1]) / buf[0] 364 */ 365 tmp = 12000000 * 32 / baud; 366 buf[3] = 0x80; 367 buf[2] = 0; 368 buf[1] = (tmp >= 256); 369 while (tmp >= 256) { 370 tmp >>= 2; 371 buf[1] <<= 1; 372 } 373 buf[0] = tmp; 374 375 return baud; 376 } 377 378 static void pl2303_encode_baud_rate(struct tty_struct *tty, 379 struct usb_serial_port *port, 380 u8 buf[4]) 381 { 382 struct usb_serial *serial = port->serial; 383 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 384 speed_t baud_sup; 385 speed_t baud; 386 387 baud = tty_get_baud_rate(tty); 388 dev_dbg(&port->dev, "baud requested = %u\n", baud); 389 if (!baud) 390 return; 391 392 if (spriv->type->max_baud_rate) 393 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 394 /* 395 * Set baud rate to nearest supported value. 396 * 397 * NOTE: Baud rate 500k can only be set using divisors. 398 */ 399 baud_sup = pl2303_get_supported_baud_rate(baud); 400 401 if (baud == 500000) 402 baud = pl2303_encode_baud_rate_divisor(buf, baud); 403 else 404 baud = pl2303_encode_baud_rate_direct(buf, baud_sup); 405 406 /* Save resulting baud rate */ 407 tty_encode_baud_rate(tty, baud, baud); 408 dev_dbg(&port->dev, "baud set = %u\n", baud); 409 } 410 411 static int pl2303_get_line_request(struct usb_serial_port *port, 412 unsigned char buf[7]) 413 { 414 struct usb_device *udev = port->serial->dev; 415 int ret; 416 417 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 418 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 419 0, 0, buf, 7, 100); 420 if (ret != 7) { 421 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 422 423 if (ret > 0) 424 ret = -EIO; 425 426 return ret; 427 } 428 429 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 430 431 return 0; 432 } 433 434 static int pl2303_set_line_request(struct usb_serial_port *port, 435 unsigned char buf[7]) 436 { 437 struct usb_device *udev = port->serial->dev; 438 int ret; 439 440 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 441 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 442 0, 0, buf, 7, 100); 443 if (ret != 7) { 444 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 445 446 if (ret > 0) 447 ret = -EIO; 448 449 return ret; 450 } 451 452 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 453 454 return 0; 455 } 456 457 static void pl2303_set_termios(struct tty_struct *tty, 458 struct usb_serial_port *port, struct ktermios *old_termios) 459 { 460 struct usb_serial *serial = port->serial; 461 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 462 struct pl2303_private *priv = usb_get_serial_port_data(port); 463 unsigned long flags; 464 unsigned char *buf; 465 int ret; 466 u8 control; 467 468 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 469 return; 470 471 buf = kzalloc(7, GFP_KERNEL); 472 if (!buf) { 473 /* Report back no change occurred */ 474 if (old_termios) 475 tty->termios = *old_termios; 476 return; 477 } 478 479 pl2303_get_line_request(port, buf); 480 481 switch (C_CSIZE(tty)) { 482 case CS5: 483 buf[6] = 5; 484 break; 485 case CS6: 486 buf[6] = 6; 487 break; 488 case CS7: 489 buf[6] = 7; 490 break; 491 default: 492 case CS8: 493 buf[6] = 8; 494 } 495 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 496 497 /* For reference buf[0]:buf[3] baud rate value */ 498 pl2303_encode_baud_rate(tty, port, &buf[0]); 499 500 /* For reference buf[4]=0 is 1 stop bits */ 501 /* For reference buf[4]=1 is 1.5 stop bits */ 502 /* For reference buf[4]=2 is 2 stop bits */ 503 if (C_CSTOPB(tty)) { 504 /* 505 * NOTE: Comply with "real" UARTs / RS232: 506 * use 1.5 instead of 2 stop bits with 5 data bits 507 */ 508 if (C_CSIZE(tty) == CS5) { 509 buf[4] = 1; 510 dev_dbg(&port->dev, "stop bits = 1.5\n"); 511 } else { 512 buf[4] = 2; 513 dev_dbg(&port->dev, "stop bits = 2\n"); 514 } 515 } else { 516 buf[4] = 0; 517 dev_dbg(&port->dev, "stop bits = 1\n"); 518 } 519 520 if (C_PARENB(tty)) { 521 /* For reference buf[5]=0 is none parity */ 522 /* For reference buf[5]=1 is odd parity */ 523 /* For reference buf[5]=2 is even parity */ 524 /* For reference buf[5]=3 is mark parity */ 525 /* For reference buf[5]=4 is space parity */ 526 if (C_PARODD(tty)) { 527 if (C_CMSPAR(tty)) { 528 buf[5] = 3; 529 dev_dbg(&port->dev, "parity = mark\n"); 530 } else { 531 buf[5] = 1; 532 dev_dbg(&port->dev, "parity = odd\n"); 533 } 534 } else { 535 if (C_CMSPAR(tty)) { 536 buf[5] = 4; 537 dev_dbg(&port->dev, "parity = space\n"); 538 } else { 539 buf[5] = 2; 540 dev_dbg(&port->dev, "parity = even\n"); 541 } 542 } 543 } else { 544 buf[5] = 0; 545 dev_dbg(&port->dev, "parity = none\n"); 546 } 547 548 /* 549 * Some PL2303 are known to lose bytes if you change serial settings 550 * even to the same values as before. Thus we actually need to filter 551 * in this specific case. 552 * 553 * Note that the tty_termios_hw_change check above is not sufficient 554 * as a previously requested baud rate may differ from the one 555 * actually used (and stored in old_termios). 556 * 557 * NOTE: No additional locking needed for line_settings as it is 558 * only used in set_termios, which is serialised against itself. 559 */ 560 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 561 ret = pl2303_set_line_request(port, buf); 562 if (!ret) 563 memcpy(priv->line_settings, buf, 7); 564 } 565 566 /* change control lines if we are switching to or from B0 */ 567 spin_lock_irqsave(&priv->lock, flags); 568 control = priv->line_control; 569 if (C_BAUD(tty) == B0) 570 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 571 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 572 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 573 if (control != priv->line_control) { 574 control = priv->line_control; 575 spin_unlock_irqrestore(&priv->lock, flags); 576 pl2303_set_control_lines(port, control); 577 } else { 578 spin_unlock_irqrestore(&priv->lock, flags); 579 } 580 581 if (C_CRTSCTS(tty)) { 582 if (spriv->quirks & PL2303_QUIRK_LEGACY) 583 pl2303_vendor_write(serial, 0x0, 0x41); 584 else 585 pl2303_vendor_write(serial, 0x0, 0x61); 586 } else { 587 pl2303_vendor_write(serial, 0x0, 0x0); 588 } 589 590 kfree(buf); 591 } 592 593 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 594 { 595 struct pl2303_private *priv = usb_get_serial_port_data(port); 596 unsigned long flags; 597 u8 control; 598 599 spin_lock_irqsave(&priv->lock, flags); 600 if (on) 601 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 602 else 603 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 604 control = priv->line_control; 605 spin_unlock_irqrestore(&priv->lock, flags); 606 607 pl2303_set_control_lines(port, control); 608 } 609 610 static void pl2303_close(struct usb_serial_port *port) 611 { 612 usb_serial_generic_close(port); 613 usb_kill_urb(port->interrupt_in_urb); 614 } 615 616 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 617 { 618 struct usb_serial *serial = port->serial; 619 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 620 int result; 621 622 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 623 usb_clear_halt(serial->dev, port->write_urb->pipe); 624 usb_clear_halt(serial->dev, port->read_urb->pipe); 625 } else { 626 /* reset upstream data pipes */ 627 pl2303_vendor_write(serial, 8, 0); 628 pl2303_vendor_write(serial, 9, 0); 629 } 630 631 /* Setup termios */ 632 if (tty) 633 pl2303_set_termios(tty, port, NULL); 634 635 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 636 if (result) { 637 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 638 result); 639 return result; 640 } 641 642 result = usb_serial_generic_open(tty, port); 643 if (result) { 644 usb_kill_urb(port->interrupt_in_urb); 645 return result; 646 } 647 648 return 0; 649 } 650 651 static int pl2303_tiocmset(struct tty_struct *tty, 652 unsigned int set, unsigned int clear) 653 { 654 struct usb_serial_port *port = tty->driver_data; 655 struct pl2303_private *priv = usb_get_serial_port_data(port); 656 unsigned long flags; 657 u8 control; 658 int ret; 659 660 spin_lock_irqsave(&priv->lock, flags); 661 if (set & TIOCM_RTS) 662 priv->line_control |= CONTROL_RTS; 663 if (set & TIOCM_DTR) 664 priv->line_control |= CONTROL_DTR; 665 if (clear & TIOCM_RTS) 666 priv->line_control &= ~CONTROL_RTS; 667 if (clear & TIOCM_DTR) 668 priv->line_control &= ~CONTROL_DTR; 669 control = priv->line_control; 670 spin_unlock_irqrestore(&priv->lock, flags); 671 672 ret = pl2303_set_control_lines(port, control); 673 if (ret) 674 return usb_translate_errors(ret); 675 676 return 0; 677 } 678 679 static int pl2303_tiocmget(struct tty_struct *tty) 680 { 681 struct usb_serial_port *port = tty->driver_data; 682 struct pl2303_private *priv = usb_get_serial_port_data(port); 683 unsigned long flags; 684 unsigned int mcr; 685 unsigned int status; 686 unsigned int result; 687 688 spin_lock_irqsave(&priv->lock, flags); 689 mcr = priv->line_control; 690 status = priv->line_status; 691 spin_unlock_irqrestore(&priv->lock, flags); 692 693 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 694 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 695 | ((status & UART_CTS) ? TIOCM_CTS : 0) 696 | ((status & UART_DSR) ? TIOCM_DSR : 0) 697 | ((status & UART_RING) ? TIOCM_RI : 0) 698 | ((status & UART_DCD) ? TIOCM_CD : 0); 699 700 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 701 702 return result; 703 } 704 705 static int pl2303_carrier_raised(struct usb_serial_port *port) 706 { 707 struct pl2303_private *priv = usb_get_serial_port_data(port); 708 709 if (priv->line_status & UART_DCD) 710 return 1; 711 712 return 0; 713 } 714 715 static int pl2303_ioctl(struct tty_struct *tty, 716 unsigned int cmd, unsigned long arg) 717 { 718 struct serial_struct ser; 719 struct usb_serial_port *port = tty->driver_data; 720 721 switch (cmd) { 722 case TIOCGSERIAL: 723 memset(&ser, 0, sizeof ser); 724 ser.type = PORT_16654; 725 ser.line = port->minor; 726 ser.port = port->port_number; 727 ser.baud_base = 460800; 728 729 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 730 return -EFAULT; 731 732 return 0; 733 default: 734 break; 735 } 736 737 return -ENOIOCTLCMD; 738 } 739 740 static void pl2303_break_ctl(struct tty_struct *tty, int break_state) 741 { 742 struct usb_serial_port *port = tty->driver_data; 743 struct usb_serial *serial = port->serial; 744 u16 state; 745 int result; 746 747 if (break_state == 0) 748 state = BREAK_OFF; 749 else 750 state = BREAK_ON; 751 752 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 753 state == BREAK_OFF ? "off" : "on"); 754 755 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 756 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 757 0, NULL, 0, 100); 758 if (result) 759 dev_err(&port->dev, "error sending break = %d\n", result); 760 } 761 762 static void pl2303_update_line_status(struct usb_serial_port *port, 763 unsigned char *data, 764 unsigned int actual_length) 765 { 766 struct usb_serial *serial = port->serial; 767 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 768 struct pl2303_private *priv = usb_get_serial_port_data(port); 769 struct tty_struct *tty; 770 unsigned long flags; 771 unsigned int status_idx = UART_STATE_INDEX; 772 u8 status; 773 u8 delta; 774 775 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 776 status_idx = 0; 777 778 if (actual_length < status_idx + 1) 779 return; 780 781 status = data[status_idx]; 782 783 /* Save off the uart status for others to look at */ 784 spin_lock_irqsave(&priv->lock, flags); 785 delta = priv->line_status ^ status; 786 priv->line_status = status; 787 spin_unlock_irqrestore(&priv->lock, flags); 788 789 if (status & UART_BREAK_ERROR) 790 usb_serial_handle_break(port); 791 792 if (delta & UART_STATE_MSR_MASK) { 793 if (delta & UART_CTS) 794 port->icount.cts++; 795 if (delta & UART_DSR) 796 port->icount.dsr++; 797 if (delta & UART_RING) 798 port->icount.rng++; 799 if (delta & UART_DCD) { 800 port->icount.dcd++; 801 tty = tty_port_tty_get(&port->port); 802 if (tty) { 803 usb_serial_handle_dcd_change(port, tty, 804 status & UART_DCD); 805 tty_kref_put(tty); 806 } 807 } 808 809 wake_up_interruptible(&port->port.delta_msr_wait); 810 } 811 } 812 813 static void pl2303_read_int_callback(struct urb *urb) 814 { 815 struct usb_serial_port *port = urb->context; 816 unsigned char *data = urb->transfer_buffer; 817 unsigned int actual_length = urb->actual_length; 818 int status = urb->status; 819 int retval; 820 821 switch (status) { 822 case 0: 823 /* success */ 824 break; 825 case -ECONNRESET: 826 case -ENOENT: 827 case -ESHUTDOWN: 828 /* this urb is terminated, clean up */ 829 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 830 __func__, status); 831 return; 832 default: 833 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 834 __func__, status); 835 goto exit; 836 } 837 838 usb_serial_debug_data(&port->dev, __func__, 839 urb->actual_length, urb->transfer_buffer); 840 841 pl2303_update_line_status(port, data, actual_length); 842 843 exit: 844 retval = usb_submit_urb(urb, GFP_ATOMIC); 845 if (retval) { 846 dev_err(&port->dev, 847 "%s - usb_submit_urb failed with result %d\n", 848 __func__, retval); 849 } 850 } 851 852 static void pl2303_process_read_urb(struct urb *urb) 853 { 854 struct usb_serial_port *port = urb->context; 855 struct pl2303_private *priv = usb_get_serial_port_data(port); 856 unsigned char *data = urb->transfer_buffer; 857 char tty_flag = TTY_NORMAL; 858 unsigned long flags; 859 u8 line_status; 860 int i; 861 862 /* update line status */ 863 spin_lock_irqsave(&priv->lock, flags); 864 line_status = priv->line_status; 865 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 866 spin_unlock_irqrestore(&priv->lock, flags); 867 868 if (!urb->actual_length) 869 return; 870 871 /* 872 * Break takes precedence over parity, which takes precedence over 873 * framing errors. 874 */ 875 if (line_status & UART_BREAK_ERROR) 876 tty_flag = TTY_BREAK; 877 else if (line_status & UART_PARITY_ERROR) 878 tty_flag = TTY_PARITY; 879 else if (line_status & UART_FRAME_ERROR) 880 tty_flag = TTY_FRAME; 881 882 if (tty_flag != TTY_NORMAL) 883 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 884 tty_flag); 885 /* overrun is special, not associated with a char */ 886 if (line_status & UART_OVERRUN_ERROR) 887 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 888 889 if (port->port.console && port->sysrq) { 890 for (i = 0; i < urb->actual_length; ++i) 891 if (!usb_serial_handle_sysrq_char(port, data[i])) 892 tty_insert_flip_char(&port->port, data[i], 893 tty_flag); 894 } else { 895 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 896 urb->actual_length); 897 } 898 899 tty_flip_buffer_push(&port->port); 900 } 901 902 static struct usb_serial_driver pl2303_device = { 903 .driver = { 904 .owner = THIS_MODULE, 905 .name = "pl2303", 906 }, 907 .id_table = id_table, 908 .num_ports = 1, 909 .bulk_in_size = 256, 910 .bulk_out_size = 256, 911 .open = pl2303_open, 912 .close = pl2303_close, 913 .dtr_rts = pl2303_dtr_rts, 914 .carrier_raised = pl2303_carrier_raised, 915 .ioctl = pl2303_ioctl, 916 .break_ctl = pl2303_break_ctl, 917 .set_termios = pl2303_set_termios, 918 .tiocmget = pl2303_tiocmget, 919 .tiocmset = pl2303_tiocmset, 920 .tiocmiwait = usb_serial_generic_tiocmiwait, 921 .process_read_urb = pl2303_process_read_urb, 922 .read_int_callback = pl2303_read_int_callback, 923 .probe = pl2303_probe, 924 .attach = pl2303_startup, 925 .release = pl2303_release, 926 .port_probe = pl2303_port_probe, 927 .port_remove = pl2303_port_remove, 928 }; 929 930 static struct usb_serial_driver * const serial_drivers[] = { 931 &pl2303_device, NULL 932 }; 933 934 module_usb_serial_driver(serial_drivers, id_table); 935 936 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 937 MODULE_LICENSE("GPL"); 938