1 /* 2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 3 * 4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 as published by the Free Software Foundation. 9 * 10 * Support to set flow control line levels using TIOCMGET and TIOCMSET 11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 12 * control thanks to Munir Nassar nassarmu@real-time.com 13 * 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/errno.h> 18 #include <linux/slab.h> 19 #include <linux/tty.h> 20 #include <linux/tty_flip.h> 21 #include <linux/module.h> 22 #include <linux/moduleparam.h> 23 #include <linux/usb.h> 24 #include <linux/uaccess.h> 25 #include <linux/usb/serial.h> 26 27 /* 28 * Version Information 29 */ 30 #define DRIVER_VERSION "v0.09" 31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 32 33 /* 34 * Function Prototypes 35 */ 36 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 37 static void cp210x_close(struct usb_serial_port *); 38 static void cp210x_get_termios(struct tty_struct *, 39 struct usb_serial_port *port); 40 static void cp210x_get_termios_port(struct usb_serial_port *port, 41 unsigned int *cflagp, unsigned int *baudp); 42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 43 struct ktermios*); 44 static int cp210x_tiocmget(struct tty_struct *, struct file *); 45 static int cp210x_tiocmset(struct tty_struct *, struct file *, 46 unsigned int, unsigned int); 47 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *, 48 unsigned int, unsigned int); 49 static void cp210x_break_ctl(struct tty_struct *, int); 50 static int cp210x_startup(struct usb_serial *); 51 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 52 static int cp210x_carrier_raised(struct usb_serial_port *p); 53 54 static int debug; 55 56 static const struct usb_device_id id_table[] = { 57 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 58 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 62 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 63 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 64 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 65 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 66 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 67 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 68 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 69 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 70 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 71 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 72 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 73 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 74 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 75 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 76 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 77 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 78 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 79 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 80 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 81 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 82 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 83 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 84 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 85 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 86 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 87 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 88 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 89 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 90 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 91 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 92 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 93 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 94 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 95 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 96 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */ 97 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesys ETRX2USB */ 98 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 99 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 100 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 101 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 102 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 103 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 104 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 105 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 106 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 107 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 108 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 109 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 110 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 111 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 112 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 113 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 114 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 115 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 116 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 117 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 118 { } /* Terminating Entry */ 119 }; 120 121 MODULE_DEVICE_TABLE(usb, id_table); 122 123 static struct usb_driver cp210x_driver = { 124 .name = "cp210x", 125 .probe = usb_serial_probe, 126 .disconnect = usb_serial_disconnect, 127 .id_table = id_table, 128 .no_dynamic_id = 1, 129 }; 130 131 static struct usb_serial_driver cp210x_device = { 132 .driver = { 133 .owner = THIS_MODULE, 134 .name = "cp210x", 135 }, 136 .usb_driver = &cp210x_driver, 137 .id_table = id_table, 138 .num_ports = 1, 139 .bulk_in_size = 256, 140 .bulk_out_size = 256, 141 .open = cp210x_open, 142 .close = cp210x_close, 143 .break_ctl = cp210x_break_ctl, 144 .set_termios = cp210x_set_termios, 145 .tiocmget = cp210x_tiocmget, 146 .tiocmset = cp210x_tiocmset, 147 .attach = cp210x_startup, 148 .dtr_rts = cp210x_dtr_rts, 149 .carrier_raised = cp210x_carrier_raised 150 }; 151 152 /* Config request types */ 153 #define REQTYPE_HOST_TO_DEVICE 0x41 154 #define REQTYPE_DEVICE_TO_HOST 0xc1 155 156 /* Config request codes */ 157 #define CP210X_IFC_ENABLE 0x00 158 #define CP210X_SET_BAUDDIV 0x01 159 #define CP210X_GET_BAUDDIV 0x02 160 #define CP210X_SET_LINE_CTL 0x03 161 #define CP210X_GET_LINE_CTL 0x04 162 #define CP210X_SET_BREAK 0x05 163 #define CP210X_IMM_CHAR 0x06 164 #define CP210X_SET_MHS 0x07 165 #define CP210X_GET_MDMSTS 0x08 166 #define CP210X_SET_XON 0x09 167 #define CP210X_SET_XOFF 0x0A 168 #define CP210X_SET_EVENTMASK 0x0B 169 #define CP210X_GET_EVENTMASK 0x0C 170 #define CP210X_SET_CHAR 0x0D 171 #define CP210X_GET_CHARS 0x0E 172 #define CP210X_GET_PROPS 0x0F 173 #define CP210X_GET_COMM_STATUS 0x10 174 #define CP210X_RESET 0x11 175 #define CP210X_PURGE 0x12 176 #define CP210X_SET_FLOW 0x13 177 #define CP210X_GET_FLOW 0x14 178 #define CP210X_EMBED_EVENTS 0x15 179 #define CP210X_GET_EVENTSTATE 0x16 180 #define CP210X_SET_CHARS 0x19 181 182 /* CP210X_IFC_ENABLE */ 183 #define UART_ENABLE 0x0001 184 #define UART_DISABLE 0x0000 185 186 /* CP210X_(SET|GET)_BAUDDIV */ 187 #define BAUD_RATE_GEN_FREQ 0x384000 188 189 /* CP210X_(SET|GET)_LINE_CTL */ 190 #define BITS_DATA_MASK 0X0f00 191 #define BITS_DATA_5 0X0500 192 #define BITS_DATA_6 0X0600 193 #define BITS_DATA_7 0X0700 194 #define BITS_DATA_8 0X0800 195 #define BITS_DATA_9 0X0900 196 197 #define BITS_PARITY_MASK 0x00f0 198 #define BITS_PARITY_NONE 0x0000 199 #define BITS_PARITY_ODD 0x0010 200 #define BITS_PARITY_EVEN 0x0020 201 #define BITS_PARITY_MARK 0x0030 202 #define BITS_PARITY_SPACE 0x0040 203 204 #define BITS_STOP_MASK 0x000f 205 #define BITS_STOP_1 0x0000 206 #define BITS_STOP_1_5 0x0001 207 #define BITS_STOP_2 0x0002 208 209 /* CP210X_SET_BREAK */ 210 #define BREAK_ON 0x0000 211 #define BREAK_OFF 0x0001 212 213 /* CP210X_(SET_MHS|GET_MDMSTS) */ 214 #define CONTROL_DTR 0x0001 215 #define CONTROL_RTS 0x0002 216 #define CONTROL_CTS 0x0010 217 #define CONTROL_DSR 0x0020 218 #define CONTROL_RING 0x0040 219 #define CONTROL_DCD 0x0080 220 #define CONTROL_WRITE_DTR 0x0100 221 #define CONTROL_WRITE_RTS 0x0200 222 223 /* 224 * cp210x_get_config 225 * Reads from the CP210x configuration registers 226 * 'size' is specified in bytes. 227 * 'data' is a pointer to a pre-allocated array of integers large 228 * enough to hold 'size' bytes (with 4 bytes to each integer) 229 */ 230 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 231 unsigned int *data, int size) 232 { 233 struct usb_serial *serial = port->serial; 234 __le32 *buf; 235 int result, i, length; 236 237 /* Number of integers required to contain the array */ 238 length = (((size - 1) | 3) + 1)/4; 239 240 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 241 if (!buf) { 242 dev_err(&port->dev, "%s - out of memory.\n", __func__); 243 return -ENOMEM; 244 } 245 246 /* Issue the request, attempting to read 'size' bytes */ 247 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 248 request, REQTYPE_DEVICE_TO_HOST, 0x0000, 249 0, buf, size, 300); 250 251 /* Convert data into an array of integers */ 252 for (i = 0; i < length; i++) 253 data[i] = le32_to_cpu(buf[i]); 254 255 kfree(buf); 256 257 if (result != size) { 258 dbg("%s - Unable to send config request, " 259 "request=0x%x size=%d result=%d\n", 260 __func__, request, size, result); 261 return -EPROTO; 262 } 263 264 return 0; 265 } 266 267 /* 268 * cp210x_set_config 269 * Writes to the CP210x configuration registers 270 * Values less than 16 bits wide are sent directly 271 * 'size' is specified in bytes. 272 */ 273 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 274 unsigned int *data, int size) 275 { 276 struct usb_serial *serial = port->serial; 277 __le32 *buf; 278 int result, i, length; 279 280 /* Number of integers required to contain the array */ 281 length = (((size - 1) | 3) + 1)/4; 282 283 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 284 if (!buf) { 285 dev_err(&port->dev, "%s - out of memory.\n", 286 __func__); 287 return -ENOMEM; 288 } 289 290 /* Array of integers into bytes */ 291 for (i = 0; i < length; i++) 292 buf[i] = cpu_to_le32(data[i]); 293 294 if (size > 2) { 295 result = usb_control_msg(serial->dev, 296 usb_sndctrlpipe(serial->dev, 0), 297 request, REQTYPE_HOST_TO_DEVICE, 0x0000, 298 0, buf, size, 300); 299 } else { 300 result = usb_control_msg(serial->dev, 301 usb_sndctrlpipe(serial->dev, 0), 302 request, REQTYPE_HOST_TO_DEVICE, data[0], 303 0, NULL, 0, 300); 304 } 305 306 kfree(buf); 307 308 if ((size > 2 && result != size) || result < 0) { 309 dbg("%s - Unable to send request, " 310 "request=0x%x size=%d result=%d\n", 311 __func__, request, size, result); 312 return -EPROTO; 313 } 314 315 return 0; 316 } 317 318 /* 319 * cp210x_set_config_single 320 * Convenience function for calling cp210x_set_config on single data values 321 * without requiring an integer pointer 322 */ 323 static inline int cp210x_set_config_single(struct usb_serial_port *port, 324 u8 request, unsigned int data) 325 { 326 return cp210x_set_config(port, request, &data, 2); 327 } 328 329 /* 330 * cp210x_quantise_baudrate 331 * Quantises the baud rate as per AN205 Table 1 332 */ 333 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 334 if (baud <= 56) baud = 0; 335 else if (baud <= 300) baud = 300; 336 else if (baud <= 600) baud = 600; 337 else if (baud <= 1200) baud = 1200; 338 else if (baud <= 1800) baud = 1800; 339 else if (baud <= 2400) baud = 2400; 340 else if (baud <= 4000) baud = 4000; 341 else if (baud <= 4803) baud = 4800; 342 else if (baud <= 7207) baud = 7200; 343 else if (baud <= 9612) baud = 9600; 344 else if (baud <= 14428) baud = 14400; 345 else if (baud <= 16062) baud = 16000; 346 else if (baud <= 19250) baud = 19200; 347 else if (baud <= 28912) baud = 28800; 348 else if (baud <= 38601) baud = 38400; 349 else if (baud <= 51558) baud = 51200; 350 else if (baud <= 56280) baud = 56000; 351 else if (baud <= 58053) baud = 57600; 352 else if (baud <= 64111) baud = 64000; 353 else if (baud <= 77608) baud = 76800; 354 else if (baud <= 117028) baud = 115200; 355 else if (baud <= 129347) baud = 128000; 356 else if (baud <= 156868) baud = 153600; 357 else if (baud <= 237832) baud = 230400; 358 else if (baud <= 254234) baud = 250000; 359 else if (baud <= 273066) baud = 256000; 360 else if (baud <= 491520) baud = 460800; 361 else if (baud <= 567138) baud = 500000; 362 else if (baud <= 670254) baud = 576000; 363 else if (baud <= 1053257) baud = 921600; 364 else if (baud <= 1474560) baud = 1228800; 365 else if (baud <= 2457600) baud = 1843200; 366 else baud = 3686400; 367 return baud; 368 } 369 370 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 371 { 372 int result; 373 374 dbg("%s - port %d", __func__, port->number); 375 376 if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) { 377 dev_err(&port->dev, "%s - Unable to enable UART\n", 378 __func__); 379 return -EPROTO; 380 } 381 382 result = usb_serial_generic_open(tty, port); 383 if (result) 384 return result; 385 386 /* Configure the termios structure */ 387 cp210x_get_termios(tty, port); 388 return 0; 389 } 390 391 static void cp210x_close(struct usb_serial_port *port) 392 { 393 dbg("%s - port %d", __func__, port->number); 394 395 usb_serial_generic_close(port); 396 397 mutex_lock(&port->serial->disc_mutex); 398 if (!port->serial->disconnected) 399 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 400 mutex_unlock(&port->serial->disc_mutex); 401 } 402 403 /* 404 * cp210x_get_termios 405 * Reads the baud rate, data bits, parity, stop bits and flow control mode 406 * from the device, corrects any unsupported values, and configures the 407 * termios structure to reflect the state of the device 408 */ 409 static void cp210x_get_termios(struct tty_struct *tty, 410 struct usb_serial_port *port) 411 { 412 unsigned int baud; 413 414 if (tty) { 415 cp210x_get_termios_port(tty->driver_data, 416 &tty->termios->c_cflag, &baud); 417 tty_encode_baud_rate(tty, baud, baud); 418 } 419 420 else { 421 unsigned int cflag; 422 cflag = 0; 423 cp210x_get_termios_port(port, &cflag, &baud); 424 } 425 } 426 427 /* 428 * cp210x_get_termios_port 429 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 430 */ 431 static void cp210x_get_termios_port(struct usb_serial_port *port, 432 unsigned int *cflagp, unsigned int *baudp) 433 { 434 unsigned int cflag, modem_ctl[4]; 435 unsigned int baud; 436 unsigned int bits; 437 438 dbg("%s - port %d", __func__, port->number); 439 440 cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2); 441 /* Convert to baudrate */ 442 if (baud) 443 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud); 444 445 dbg("%s - baud rate = %d", __func__, baud); 446 *baudp = baud; 447 448 cflag = *cflagp; 449 450 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 451 cflag &= ~CSIZE; 452 switch (bits & BITS_DATA_MASK) { 453 case BITS_DATA_5: 454 dbg("%s - data bits = 5", __func__); 455 cflag |= CS5; 456 break; 457 case BITS_DATA_6: 458 dbg("%s - data bits = 6", __func__); 459 cflag |= CS6; 460 break; 461 case BITS_DATA_7: 462 dbg("%s - data bits = 7", __func__); 463 cflag |= CS7; 464 break; 465 case BITS_DATA_8: 466 dbg("%s - data bits = 8", __func__); 467 cflag |= CS8; 468 break; 469 case BITS_DATA_9: 470 dbg("%s - data bits = 9 (not supported, using 8 data bits)", 471 __func__); 472 cflag |= CS8; 473 bits &= ~BITS_DATA_MASK; 474 bits |= BITS_DATA_8; 475 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 476 break; 477 default: 478 dbg("%s - Unknown number of data bits, using 8", __func__); 479 cflag |= CS8; 480 bits &= ~BITS_DATA_MASK; 481 bits |= BITS_DATA_8; 482 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 483 break; 484 } 485 486 switch (bits & BITS_PARITY_MASK) { 487 case BITS_PARITY_NONE: 488 dbg("%s - parity = NONE", __func__); 489 cflag &= ~PARENB; 490 break; 491 case BITS_PARITY_ODD: 492 dbg("%s - parity = ODD", __func__); 493 cflag |= (PARENB|PARODD); 494 break; 495 case BITS_PARITY_EVEN: 496 dbg("%s - parity = EVEN", __func__); 497 cflag &= ~PARODD; 498 cflag |= PARENB; 499 break; 500 case BITS_PARITY_MARK: 501 dbg("%s - parity = MARK (not supported, disabling parity)", 502 __func__); 503 cflag &= ~PARENB; 504 bits &= ~BITS_PARITY_MASK; 505 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 506 break; 507 case BITS_PARITY_SPACE: 508 dbg("%s - parity = SPACE (not supported, disabling parity)", 509 __func__); 510 cflag &= ~PARENB; 511 bits &= ~BITS_PARITY_MASK; 512 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 513 break; 514 default: 515 dbg("%s - Unknown parity mode, disabling parity", __func__); 516 cflag &= ~PARENB; 517 bits &= ~BITS_PARITY_MASK; 518 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 519 break; 520 } 521 522 cflag &= ~CSTOPB; 523 switch (bits & BITS_STOP_MASK) { 524 case BITS_STOP_1: 525 dbg("%s - stop bits = 1", __func__); 526 break; 527 case BITS_STOP_1_5: 528 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)", 529 __func__); 530 bits &= ~BITS_STOP_MASK; 531 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 532 break; 533 case BITS_STOP_2: 534 dbg("%s - stop bits = 2", __func__); 535 cflag |= CSTOPB; 536 break; 537 default: 538 dbg("%s - Unknown number of stop bits, using 1 stop bit", 539 __func__); 540 bits &= ~BITS_STOP_MASK; 541 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 542 break; 543 } 544 545 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 546 if (modem_ctl[0] & 0x0008) { 547 dbg("%s - flow control = CRTSCTS", __func__); 548 cflag |= CRTSCTS; 549 } else { 550 dbg("%s - flow control = NONE", __func__); 551 cflag &= ~CRTSCTS; 552 } 553 554 *cflagp = cflag; 555 } 556 557 static void cp210x_set_termios(struct tty_struct *tty, 558 struct usb_serial_port *port, struct ktermios *old_termios) 559 { 560 unsigned int cflag, old_cflag; 561 unsigned int baud = 0, bits; 562 unsigned int modem_ctl[4]; 563 564 dbg("%s - port %d", __func__, port->number); 565 566 if (!tty) 567 return; 568 569 tty->termios->c_cflag &= ~CMSPAR; 570 cflag = tty->termios->c_cflag; 571 old_cflag = old_termios->c_cflag; 572 baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty)); 573 574 /* If the baud rate is to be updated*/ 575 if (baud != tty_termios_baud_rate(old_termios) && baud != 0) { 576 dbg("%s - Setting baud rate to %d baud", __func__, 577 baud); 578 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV, 579 ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) { 580 dbg("Baud rate requested not supported by device"); 581 baud = tty_termios_baud_rate(old_termios); 582 } 583 } 584 /* Report back the resulting baud rate */ 585 tty_encode_baud_rate(tty, baud, baud); 586 587 /* If the number of data bits is to be updated */ 588 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 589 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 590 bits &= ~BITS_DATA_MASK; 591 switch (cflag & CSIZE) { 592 case CS5: 593 bits |= BITS_DATA_5; 594 dbg("%s - data bits = 5", __func__); 595 break; 596 case CS6: 597 bits |= BITS_DATA_6; 598 dbg("%s - data bits = 6", __func__); 599 break; 600 case CS7: 601 bits |= BITS_DATA_7; 602 dbg("%s - data bits = 7", __func__); 603 break; 604 case CS8: 605 bits |= BITS_DATA_8; 606 dbg("%s - data bits = 8", __func__); 607 break; 608 /*case CS9: 609 bits |= BITS_DATA_9; 610 dbg("%s - data bits = 9", __func__); 611 break;*/ 612 default: 613 dbg("cp210x driver does not " 614 "support the number of bits requested," 615 " using 8 bit mode\n"); 616 bits |= BITS_DATA_8; 617 break; 618 } 619 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 620 dbg("Number of data bits requested " 621 "not supported by device\n"); 622 } 623 624 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) { 625 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 626 bits &= ~BITS_PARITY_MASK; 627 if (cflag & PARENB) { 628 if (cflag & PARODD) { 629 bits |= BITS_PARITY_ODD; 630 dbg("%s - parity = ODD", __func__); 631 } else { 632 bits |= BITS_PARITY_EVEN; 633 dbg("%s - parity = EVEN", __func__); 634 } 635 } 636 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 637 dbg("Parity mode not supported " 638 "by device\n"); 639 } 640 641 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 642 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 643 bits &= ~BITS_STOP_MASK; 644 if (cflag & CSTOPB) { 645 bits |= BITS_STOP_2; 646 dbg("%s - stop bits = 2", __func__); 647 } else { 648 bits |= BITS_STOP_1; 649 dbg("%s - stop bits = 1", __func__); 650 } 651 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 652 dbg("Number of stop bits requested " 653 "not supported by device\n"); 654 } 655 656 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 657 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 658 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 659 __func__, modem_ctl[0], modem_ctl[1], 660 modem_ctl[2], modem_ctl[3]); 661 662 if (cflag & CRTSCTS) { 663 modem_ctl[0] &= ~0x7B; 664 modem_ctl[0] |= 0x09; 665 modem_ctl[1] = 0x80; 666 dbg("%s - flow control = CRTSCTS", __func__); 667 } else { 668 modem_ctl[0] &= ~0x7B; 669 modem_ctl[0] |= 0x01; 670 modem_ctl[1] |= 0x40; 671 dbg("%s - flow control = NONE", __func__); 672 } 673 674 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 675 __func__, modem_ctl[0], modem_ctl[1], 676 modem_ctl[2], modem_ctl[3]); 677 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 678 } 679 680 } 681 682 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file, 683 unsigned int set, unsigned int clear) 684 { 685 struct usb_serial_port *port = tty->driver_data; 686 return cp210x_tiocmset_port(port, file, set, clear); 687 } 688 689 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file, 690 unsigned int set, unsigned int clear) 691 { 692 unsigned int control = 0; 693 694 dbg("%s - port %d", __func__, port->number); 695 696 if (set & TIOCM_RTS) { 697 control |= CONTROL_RTS; 698 control |= CONTROL_WRITE_RTS; 699 } 700 if (set & TIOCM_DTR) { 701 control |= CONTROL_DTR; 702 control |= CONTROL_WRITE_DTR; 703 } 704 if (clear & TIOCM_RTS) { 705 control &= ~CONTROL_RTS; 706 control |= CONTROL_WRITE_RTS; 707 } 708 if (clear & TIOCM_DTR) { 709 control &= ~CONTROL_DTR; 710 control |= CONTROL_WRITE_DTR; 711 } 712 713 dbg("%s - control = 0x%.4x", __func__, control); 714 715 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 716 } 717 718 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 719 { 720 if (on) 721 cp210x_tiocmset_port(p, NULL, TIOCM_DTR|TIOCM_RTS, 0); 722 else 723 cp210x_tiocmset_port(p, NULL, 0, TIOCM_DTR|TIOCM_RTS); 724 } 725 726 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file) 727 { 728 struct usb_serial_port *port = tty->driver_data; 729 unsigned int control; 730 int result; 731 732 dbg("%s - port %d", __func__, port->number); 733 734 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 735 736 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 737 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 738 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 739 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 740 |((control & CONTROL_RING)? TIOCM_RI : 0) 741 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 742 743 dbg("%s - control = 0x%.2x", __func__, control); 744 745 return result; 746 } 747 748 static int cp210x_carrier_raised(struct usb_serial_port *p) 749 { 750 unsigned int control; 751 cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1); 752 if (control & CONTROL_DCD) 753 return 1; 754 return 0; 755 } 756 757 static void cp210x_break_ctl (struct tty_struct *tty, int break_state) 758 { 759 struct usb_serial_port *port = tty->driver_data; 760 unsigned int state; 761 762 dbg("%s - port %d", __func__, port->number); 763 if (break_state == 0) 764 state = BREAK_OFF; 765 else 766 state = BREAK_ON; 767 dbg("%s - turning break %s", __func__, 768 state == BREAK_OFF ? "off" : "on"); 769 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 770 } 771 772 static int cp210x_startup(struct usb_serial *serial) 773 { 774 /* cp210x buffers behave strangely unless device is reset */ 775 usb_reset_device(serial->dev); 776 return 0; 777 } 778 779 static int __init cp210x_init(void) 780 { 781 int retval; 782 783 retval = usb_serial_register(&cp210x_device); 784 if (retval) 785 return retval; /* Failed to register */ 786 787 retval = usb_register(&cp210x_driver); 788 if (retval) { 789 /* Failed to register */ 790 usb_serial_deregister(&cp210x_device); 791 return retval; 792 } 793 794 /* Success */ 795 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 796 DRIVER_DESC "\n"); 797 return 0; 798 } 799 800 static void __exit cp210x_exit(void) 801 { 802 usb_deregister(&cp210x_driver); 803 usb_serial_deregister(&cp210x_device); 804 } 805 806 module_init(cp210x_init); 807 module_exit(cp210x_exit); 808 809 MODULE_DESCRIPTION(DRIVER_DESC); 810 MODULE_VERSION(DRIVER_VERSION); 811 MODULE_LICENSE("GPL"); 812 813 module_param(debug, bool, S_IRUGO | S_IWUSR); 814 MODULE_PARM_DESC(debug, "Enable verbose debugging messages"); 815