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_change_speed(struct tty_struct *, struct usb_serial_port *, 43 struct ktermios *); 44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 45 struct ktermios*); 46 static int cp210x_tiocmget(struct tty_struct *); 47 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 48 static int cp210x_tiocmset_port(struct usb_serial_port *port, 49 unsigned int, unsigned int); 50 static void cp210x_break_ctl(struct tty_struct *, int); 51 static int cp210x_startup(struct usb_serial *); 52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 53 54 static bool debug; 55 56 static const struct usb_device_id id_table[] = { 57 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 58 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 59 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 60 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 61 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 62 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 63 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 64 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 70 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 71 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 72 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 73 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 74 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 75 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 76 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 77 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 78 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 79 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 80 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 81 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 82 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 83 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 84 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 85 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 86 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 87 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 88 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 89 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 90 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 91 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 94 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 95 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 96 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 97 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 98 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 99 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 100 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 101 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 102 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 103 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 104 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 105 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 106 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 107 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 108 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 109 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 110 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 111 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 112 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 113 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 114 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 115 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 116 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 117 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 118 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 119 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 120 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 121 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 122 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 123 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 124 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 125 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 126 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 127 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 128 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 129 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 130 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 131 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 132 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 133 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 134 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 135 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 136 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 137 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 138 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 139 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 140 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 141 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 142 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 143 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 144 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 145 { } /* Terminating Entry */ 146 }; 147 148 MODULE_DEVICE_TABLE(usb, id_table); 149 150 static struct usb_driver cp210x_driver = { 151 .name = "cp210x", 152 .probe = usb_serial_probe, 153 .disconnect = usb_serial_disconnect, 154 .id_table = id_table, 155 .no_dynamic_id = 1, 156 }; 157 158 static struct usb_serial_driver cp210x_device = { 159 .driver = { 160 .owner = THIS_MODULE, 161 .name = "cp210x", 162 }, 163 .usb_driver = &cp210x_driver, 164 .id_table = id_table, 165 .num_ports = 1, 166 .bulk_in_size = 256, 167 .bulk_out_size = 256, 168 .open = cp210x_open, 169 .close = cp210x_close, 170 .break_ctl = cp210x_break_ctl, 171 .set_termios = cp210x_set_termios, 172 .tiocmget = cp210x_tiocmget, 173 .tiocmset = cp210x_tiocmset, 174 .attach = cp210x_startup, 175 .dtr_rts = cp210x_dtr_rts 176 }; 177 178 /* Config request types */ 179 #define REQTYPE_HOST_TO_DEVICE 0x41 180 #define REQTYPE_DEVICE_TO_HOST 0xc1 181 182 /* Config request codes */ 183 #define CP210X_IFC_ENABLE 0x00 184 #define CP210X_SET_BAUDDIV 0x01 185 #define CP210X_GET_BAUDDIV 0x02 186 #define CP210X_SET_LINE_CTL 0x03 187 #define CP210X_GET_LINE_CTL 0x04 188 #define CP210X_SET_BREAK 0x05 189 #define CP210X_IMM_CHAR 0x06 190 #define CP210X_SET_MHS 0x07 191 #define CP210X_GET_MDMSTS 0x08 192 #define CP210X_SET_XON 0x09 193 #define CP210X_SET_XOFF 0x0A 194 #define CP210X_SET_EVENTMASK 0x0B 195 #define CP210X_GET_EVENTMASK 0x0C 196 #define CP210X_SET_CHAR 0x0D 197 #define CP210X_GET_CHARS 0x0E 198 #define CP210X_GET_PROPS 0x0F 199 #define CP210X_GET_COMM_STATUS 0x10 200 #define CP210X_RESET 0x11 201 #define CP210X_PURGE 0x12 202 #define CP210X_SET_FLOW 0x13 203 #define CP210X_GET_FLOW 0x14 204 #define CP210X_EMBED_EVENTS 0x15 205 #define CP210X_GET_EVENTSTATE 0x16 206 #define CP210X_SET_CHARS 0x19 207 #define CP210X_GET_BAUDRATE 0x1D 208 #define CP210X_SET_BAUDRATE 0x1E 209 210 /* CP210X_IFC_ENABLE */ 211 #define UART_ENABLE 0x0001 212 #define UART_DISABLE 0x0000 213 214 /* CP210X_(SET|GET)_BAUDDIV */ 215 #define BAUD_RATE_GEN_FREQ 0x384000 216 217 /* CP210X_(SET|GET)_LINE_CTL */ 218 #define BITS_DATA_MASK 0X0f00 219 #define BITS_DATA_5 0X0500 220 #define BITS_DATA_6 0X0600 221 #define BITS_DATA_7 0X0700 222 #define BITS_DATA_8 0X0800 223 #define BITS_DATA_9 0X0900 224 225 #define BITS_PARITY_MASK 0x00f0 226 #define BITS_PARITY_NONE 0x0000 227 #define BITS_PARITY_ODD 0x0010 228 #define BITS_PARITY_EVEN 0x0020 229 #define BITS_PARITY_MARK 0x0030 230 #define BITS_PARITY_SPACE 0x0040 231 232 #define BITS_STOP_MASK 0x000f 233 #define BITS_STOP_1 0x0000 234 #define BITS_STOP_1_5 0x0001 235 #define BITS_STOP_2 0x0002 236 237 /* CP210X_SET_BREAK */ 238 #define BREAK_ON 0x0001 239 #define BREAK_OFF 0x0000 240 241 /* CP210X_(SET_MHS|GET_MDMSTS) */ 242 #define CONTROL_DTR 0x0001 243 #define CONTROL_RTS 0x0002 244 #define CONTROL_CTS 0x0010 245 #define CONTROL_DSR 0x0020 246 #define CONTROL_RING 0x0040 247 #define CONTROL_DCD 0x0080 248 #define CONTROL_WRITE_DTR 0x0100 249 #define CONTROL_WRITE_RTS 0x0200 250 251 /* 252 * cp210x_get_config 253 * Reads from the CP210x configuration registers 254 * 'size' is specified in bytes. 255 * 'data' is a pointer to a pre-allocated array of integers large 256 * enough to hold 'size' bytes (with 4 bytes to each integer) 257 */ 258 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 259 unsigned int *data, int size) 260 { 261 struct usb_serial *serial = port->serial; 262 __le32 *buf; 263 int result, i, length; 264 265 /* Number of integers required to contain the array */ 266 length = (((size - 1) | 3) + 1)/4; 267 268 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 269 if (!buf) { 270 dev_err(&port->dev, "%s - out of memory.\n", __func__); 271 return -ENOMEM; 272 } 273 274 /* Issue the request, attempting to read 'size' bytes */ 275 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 276 request, REQTYPE_DEVICE_TO_HOST, 0x0000, 277 0, buf, size, 300); 278 279 /* Convert data into an array of integers */ 280 for (i = 0; i < length; i++) 281 data[i] = le32_to_cpu(buf[i]); 282 283 kfree(buf); 284 285 if (result != size) { 286 dbg("%s - Unable to send config request, " 287 "request=0x%x size=%d result=%d\n", 288 __func__, request, size, result); 289 if (result > 0) 290 result = -EPROTO; 291 292 return result; 293 } 294 295 return 0; 296 } 297 298 /* 299 * cp210x_set_config 300 * Writes to the CP210x configuration registers 301 * Values less than 16 bits wide are sent directly 302 * 'size' is specified in bytes. 303 */ 304 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 305 unsigned int *data, int size) 306 { 307 struct usb_serial *serial = port->serial; 308 __le32 *buf; 309 int result, i, length; 310 311 /* Number of integers required to contain the array */ 312 length = (((size - 1) | 3) + 1)/4; 313 314 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 315 if (!buf) { 316 dev_err(&port->dev, "%s - out of memory.\n", 317 __func__); 318 return -ENOMEM; 319 } 320 321 /* Array of integers into bytes */ 322 for (i = 0; i < length; i++) 323 buf[i] = cpu_to_le32(data[i]); 324 325 if (size > 2) { 326 result = usb_control_msg(serial->dev, 327 usb_sndctrlpipe(serial->dev, 0), 328 request, REQTYPE_HOST_TO_DEVICE, 0x0000, 329 0, buf, size, 300); 330 } else { 331 result = usb_control_msg(serial->dev, 332 usb_sndctrlpipe(serial->dev, 0), 333 request, REQTYPE_HOST_TO_DEVICE, data[0], 334 0, NULL, 0, 300); 335 } 336 337 kfree(buf); 338 339 if ((size > 2 && result != size) || result < 0) { 340 dbg("%s - Unable to send request, " 341 "request=0x%x size=%d result=%d\n", 342 __func__, request, size, result); 343 if (result > 0) 344 result = -EPROTO; 345 346 return result; 347 } 348 349 return 0; 350 } 351 352 /* 353 * cp210x_set_config_single 354 * Convenience function for calling cp210x_set_config on single data values 355 * without requiring an integer pointer 356 */ 357 static inline int cp210x_set_config_single(struct usb_serial_port *port, 358 u8 request, unsigned int data) 359 { 360 return cp210x_set_config(port, request, &data, 2); 361 } 362 363 /* 364 * cp210x_quantise_baudrate 365 * Quantises the baud rate as per AN205 Table 1 366 */ 367 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 368 if (baud <= 300) 369 baud = 300; 370 else if (baud <= 600) baud = 600; 371 else if (baud <= 1200) baud = 1200; 372 else if (baud <= 1800) baud = 1800; 373 else if (baud <= 2400) baud = 2400; 374 else if (baud <= 4000) baud = 4000; 375 else if (baud <= 4803) baud = 4800; 376 else if (baud <= 7207) baud = 7200; 377 else if (baud <= 9612) baud = 9600; 378 else if (baud <= 14428) baud = 14400; 379 else if (baud <= 16062) baud = 16000; 380 else if (baud <= 19250) baud = 19200; 381 else if (baud <= 28912) baud = 28800; 382 else if (baud <= 38601) baud = 38400; 383 else if (baud <= 51558) baud = 51200; 384 else if (baud <= 56280) baud = 56000; 385 else if (baud <= 58053) baud = 57600; 386 else if (baud <= 64111) baud = 64000; 387 else if (baud <= 77608) baud = 76800; 388 else if (baud <= 117028) baud = 115200; 389 else if (baud <= 129347) baud = 128000; 390 else if (baud <= 156868) baud = 153600; 391 else if (baud <= 237832) baud = 230400; 392 else if (baud <= 254234) baud = 250000; 393 else if (baud <= 273066) baud = 256000; 394 else if (baud <= 491520) baud = 460800; 395 else if (baud <= 567138) baud = 500000; 396 else if (baud <= 670254) baud = 576000; 397 else if (baud < 1000000) 398 baud = 921600; 399 else if (baud > 2000000) 400 baud = 2000000; 401 return baud; 402 } 403 404 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 405 { 406 int result; 407 408 dbg("%s - port %d", __func__, port->number); 409 410 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 411 UART_ENABLE); 412 if (result) { 413 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 414 return result; 415 } 416 417 /* Configure the termios structure */ 418 cp210x_get_termios(tty, port); 419 420 /* The baud rate must be initialised on cp2104 */ 421 if (tty) 422 cp210x_change_speed(tty, port, NULL); 423 424 return usb_serial_generic_open(tty, port); 425 } 426 427 static void cp210x_close(struct usb_serial_port *port) 428 { 429 dbg("%s - port %d", __func__, port->number); 430 431 usb_serial_generic_close(port); 432 433 mutex_lock(&port->serial->disc_mutex); 434 if (!port->serial->disconnected) 435 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 436 mutex_unlock(&port->serial->disc_mutex); 437 } 438 439 /* 440 * cp210x_get_termios 441 * Reads the baud rate, data bits, parity, stop bits and flow control mode 442 * from the device, corrects any unsupported values, and configures the 443 * termios structure to reflect the state of the device 444 */ 445 static void cp210x_get_termios(struct tty_struct *tty, 446 struct usb_serial_port *port) 447 { 448 unsigned int baud; 449 450 if (tty) { 451 cp210x_get_termios_port(tty->driver_data, 452 &tty->termios->c_cflag, &baud); 453 tty_encode_baud_rate(tty, baud, baud); 454 } 455 456 else { 457 unsigned int cflag; 458 cflag = 0; 459 cp210x_get_termios_port(port, &cflag, &baud); 460 } 461 } 462 463 /* 464 * cp210x_get_termios_port 465 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 466 */ 467 static void cp210x_get_termios_port(struct usb_serial_port *port, 468 unsigned int *cflagp, unsigned int *baudp) 469 { 470 unsigned int cflag, modem_ctl[4]; 471 unsigned int baud; 472 unsigned int bits; 473 474 dbg("%s - port %d", __func__, port->number); 475 476 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 477 478 dbg("%s - baud rate = %d", __func__, baud); 479 *baudp = baud; 480 481 cflag = *cflagp; 482 483 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 484 cflag &= ~CSIZE; 485 switch (bits & BITS_DATA_MASK) { 486 case BITS_DATA_5: 487 dbg("%s - data bits = 5", __func__); 488 cflag |= CS5; 489 break; 490 case BITS_DATA_6: 491 dbg("%s - data bits = 6", __func__); 492 cflag |= CS6; 493 break; 494 case BITS_DATA_7: 495 dbg("%s - data bits = 7", __func__); 496 cflag |= CS7; 497 break; 498 case BITS_DATA_8: 499 dbg("%s - data bits = 8", __func__); 500 cflag |= CS8; 501 break; 502 case BITS_DATA_9: 503 dbg("%s - data bits = 9 (not supported, using 8 data bits)", 504 __func__); 505 cflag |= CS8; 506 bits &= ~BITS_DATA_MASK; 507 bits |= BITS_DATA_8; 508 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 509 break; 510 default: 511 dbg("%s - Unknown number of data bits, using 8", __func__); 512 cflag |= CS8; 513 bits &= ~BITS_DATA_MASK; 514 bits |= BITS_DATA_8; 515 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 516 break; 517 } 518 519 switch (bits & BITS_PARITY_MASK) { 520 case BITS_PARITY_NONE: 521 dbg("%s - parity = NONE", __func__); 522 cflag &= ~PARENB; 523 break; 524 case BITS_PARITY_ODD: 525 dbg("%s - parity = ODD", __func__); 526 cflag |= (PARENB|PARODD); 527 break; 528 case BITS_PARITY_EVEN: 529 dbg("%s - parity = EVEN", __func__); 530 cflag &= ~PARODD; 531 cflag |= PARENB; 532 break; 533 case BITS_PARITY_MARK: 534 dbg("%s - parity = MARK", __func__); 535 cflag |= (PARENB|PARODD|CMSPAR); 536 break; 537 case BITS_PARITY_SPACE: 538 dbg("%s - parity = SPACE", __func__); 539 cflag &= ~PARODD; 540 cflag |= (PARENB|CMSPAR); 541 break; 542 default: 543 dbg("%s - Unknown parity mode, disabling parity", __func__); 544 cflag &= ~PARENB; 545 bits &= ~BITS_PARITY_MASK; 546 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 547 break; 548 } 549 550 cflag &= ~CSTOPB; 551 switch (bits & BITS_STOP_MASK) { 552 case BITS_STOP_1: 553 dbg("%s - stop bits = 1", __func__); 554 break; 555 case BITS_STOP_1_5: 556 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)", 557 __func__); 558 bits &= ~BITS_STOP_MASK; 559 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 560 break; 561 case BITS_STOP_2: 562 dbg("%s - stop bits = 2", __func__); 563 cflag |= CSTOPB; 564 break; 565 default: 566 dbg("%s - Unknown number of stop bits, using 1 stop bit", 567 __func__); 568 bits &= ~BITS_STOP_MASK; 569 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 570 break; 571 } 572 573 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 574 if (modem_ctl[0] & 0x0008) { 575 dbg("%s - flow control = CRTSCTS", __func__); 576 cflag |= CRTSCTS; 577 } else { 578 dbg("%s - flow control = NONE", __func__); 579 cflag &= ~CRTSCTS; 580 } 581 582 *cflagp = cflag; 583 } 584 585 /* 586 * CP2101 supports the following baud rates: 587 * 588 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 589 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 590 * 591 * CP2102 and CP2103 support the following additional rates: 592 * 593 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 594 * 576000 595 * 596 * The device will map a requested rate to a supported one, but the result 597 * of requests for rates greater than 1053257 is undefined (see AN205). 598 * 599 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 600 * respectively, with an error less than 1%. The actual rates are determined 601 * by 602 * 603 * div = round(freq / (2 x prescale x request)) 604 * actual = freq / (2 x prescale x div) 605 * 606 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 607 * or 1 otherwise. 608 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 609 * otherwise. 610 */ 611 static void cp210x_change_speed(struct tty_struct *tty, 612 struct usb_serial_port *port, struct ktermios *old_termios) 613 { 614 u32 baud; 615 616 baud = tty->termios->c_ospeed; 617 618 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 619 * or to an arbitrary rate in [1M,2M]. 620 * 621 * NOTE: B0 is not implemented. 622 */ 623 baud = cp210x_quantise_baudrate(baud); 624 625 dbg("%s - setting baud rate to %u", __func__, baud); 626 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 627 sizeof(baud))) { 628 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 629 if (old_termios) 630 baud = old_termios->c_ospeed; 631 else 632 baud = 9600; 633 } 634 635 tty_encode_baud_rate(tty, baud, baud); 636 } 637 638 static void cp210x_set_termios(struct tty_struct *tty, 639 struct usb_serial_port *port, struct ktermios *old_termios) 640 { 641 unsigned int cflag, old_cflag; 642 unsigned int bits; 643 unsigned int modem_ctl[4]; 644 645 dbg("%s - port %d", __func__, port->number); 646 647 if (!tty) 648 return; 649 650 cflag = tty->termios->c_cflag; 651 old_cflag = old_termios->c_cflag; 652 653 if (tty->termios->c_ospeed != old_termios->c_ospeed) 654 cp210x_change_speed(tty, port, old_termios); 655 656 /* If the number of data bits is to be updated */ 657 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 658 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 659 bits &= ~BITS_DATA_MASK; 660 switch (cflag & CSIZE) { 661 case CS5: 662 bits |= BITS_DATA_5; 663 dbg("%s - data bits = 5", __func__); 664 break; 665 case CS6: 666 bits |= BITS_DATA_6; 667 dbg("%s - data bits = 6", __func__); 668 break; 669 case CS7: 670 bits |= BITS_DATA_7; 671 dbg("%s - data bits = 7", __func__); 672 break; 673 case CS8: 674 bits |= BITS_DATA_8; 675 dbg("%s - data bits = 8", __func__); 676 break; 677 /*case CS9: 678 bits |= BITS_DATA_9; 679 dbg("%s - data bits = 9", __func__); 680 break;*/ 681 default: 682 dbg("cp210x driver does not " 683 "support the number of bits requested," 684 " using 8 bit mode\n"); 685 bits |= BITS_DATA_8; 686 break; 687 } 688 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 689 dbg("Number of data bits requested " 690 "not supported by device\n"); 691 } 692 693 if ((cflag & (PARENB|PARODD|CMSPAR)) != 694 (old_cflag & (PARENB|PARODD|CMSPAR))) { 695 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 696 bits &= ~BITS_PARITY_MASK; 697 if (cflag & PARENB) { 698 if (cflag & CMSPAR) { 699 if (cflag & PARODD) { 700 bits |= BITS_PARITY_MARK; 701 dbg("%s - parity = MARK", __func__); 702 } else { 703 bits |= BITS_PARITY_SPACE; 704 dbg("%s - parity = SPACE", __func__); 705 } 706 } else { 707 if (cflag & PARODD) { 708 bits |= BITS_PARITY_ODD; 709 dbg("%s - parity = ODD", __func__); 710 } else { 711 bits |= BITS_PARITY_EVEN; 712 dbg("%s - parity = EVEN", __func__); 713 } 714 } 715 } 716 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 717 dbg("Parity mode not supported " 718 "by device\n"); 719 } 720 721 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 722 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 723 bits &= ~BITS_STOP_MASK; 724 if (cflag & CSTOPB) { 725 bits |= BITS_STOP_2; 726 dbg("%s - stop bits = 2", __func__); 727 } else { 728 bits |= BITS_STOP_1; 729 dbg("%s - stop bits = 1", __func__); 730 } 731 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 732 dbg("Number of stop bits requested " 733 "not supported by device\n"); 734 } 735 736 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 737 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 738 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 739 __func__, modem_ctl[0], modem_ctl[1], 740 modem_ctl[2], modem_ctl[3]); 741 742 if (cflag & CRTSCTS) { 743 modem_ctl[0] &= ~0x7B; 744 modem_ctl[0] |= 0x09; 745 modem_ctl[1] = 0x80; 746 dbg("%s - flow control = CRTSCTS", __func__); 747 } else { 748 modem_ctl[0] &= ~0x7B; 749 modem_ctl[0] |= 0x01; 750 modem_ctl[1] |= 0x40; 751 dbg("%s - flow control = NONE", __func__); 752 } 753 754 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 755 __func__, modem_ctl[0], modem_ctl[1], 756 modem_ctl[2], modem_ctl[3]); 757 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 758 } 759 760 } 761 762 static int cp210x_tiocmset (struct tty_struct *tty, 763 unsigned int set, unsigned int clear) 764 { 765 struct usb_serial_port *port = tty->driver_data; 766 return cp210x_tiocmset_port(port, set, clear); 767 } 768 769 static int cp210x_tiocmset_port(struct usb_serial_port *port, 770 unsigned int set, unsigned int clear) 771 { 772 unsigned int control = 0; 773 774 dbg("%s - port %d", __func__, port->number); 775 776 if (set & TIOCM_RTS) { 777 control |= CONTROL_RTS; 778 control |= CONTROL_WRITE_RTS; 779 } 780 if (set & TIOCM_DTR) { 781 control |= CONTROL_DTR; 782 control |= CONTROL_WRITE_DTR; 783 } 784 if (clear & TIOCM_RTS) { 785 control &= ~CONTROL_RTS; 786 control |= CONTROL_WRITE_RTS; 787 } 788 if (clear & TIOCM_DTR) { 789 control &= ~CONTROL_DTR; 790 control |= CONTROL_WRITE_DTR; 791 } 792 793 dbg("%s - control = 0x%.4x", __func__, control); 794 795 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 796 } 797 798 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 799 { 800 if (on) 801 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 802 else 803 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 804 } 805 806 static int cp210x_tiocmget (struct tty_struct *tty) 807 { 808 struct usb_serial_port *port = tty->driver_data; 809 unsigned int control; 810 int result; 811 812 dbg("%s - port %d", __func__, port->number); 813 814 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 815 816 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 817 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 818 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 819 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 820 |((control & CONTROL_RING)? TIOCM_RI : 0) 821 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 822 823 dbg("%s - control = 0x%.2x", __func__, control); 824 825 return result; 826 } 827 828 static void cp210x_break_ctl (struct tty_struct *tty, int break_state) 829 { 830 struct usb_serial_port *port = tty->driver_data; 831 unsigned int state; 832 833 dbg("%s - port %d", __func__, port->number); 834 if (break_state == 0) 835 state = BREAK_OFF; 836 else 837 state = BREAK_ON; 838 dbg("%s - turning break %s", __func__, 839 state == BREAK_OFF ? "off" : "on"); 840 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 841 } 842 843 static int cp210x_startup(struct usb_serial *serial) 844 { 845 /* cp210x buffers behave strangely unless device is reset */ 846 usb_reset_device(serial->dev); 847 return 0; 848 } 849 850 static int __init cp210x_init(void) 851 { 852 int retval; 853 854 retval = usb_serial_register(&cp210x_device); 855 if (retval) 856 return retval; /* Failed to register */ 857 858 retval = usb_register(&cp210x_driver); 859 if (retval) { 860 /* Failed to register */ 861 usb_serial_deregister(&cp210x_device); 862 return retval; 863 } 864 865 /* Success */ 866 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 867 DRIVER_DESC "\n"); 868 return 0; 869 } 870 871 static void __exit cp210x_exit(void) 872 { 873 usb_deregister(&cp210x_driver); 874 usb_serial_deregister(&cp210x_device); 875 } 876 877 module_init(cp210x_init); 878 module_exit(cp210x_exit); 879 880 MODULE_DESCRIPTION(DRIVER_DESC); 881 MODULE_VERSION(DRIVER_VERSION); 882 MODULE_LICENSE("GPL"); 883 884 module_param(debug, bool, S_IRUGO | S_IWUSR); 885 MODULE_PARM_DESC(debug, "Enable verbose debugging messages"); 886