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(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 140 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 141 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 142 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 143 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 144 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 145 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 146 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 147 { } /* Terminating Entry */ 148 }; 149 150 MODULE_DEVICE_TABLE(usb, id_table); 151 152 static struct usb_driver cp210x_driver = { 153 .name = "cp210x", 154 .probe = usb_serial_probe, 155 .disconnect = usb_serial_disconnect, 156 .id_table = id_table, 157 .no_dynamic_id = 1, 158 }; 159 160 static struct usb_serial_driver cp210x_device = { 161 .driver = { 162 .owner = THIS_MODULE, 163 .name = "cp210x", 164 }, 165 .usb_driver = &cp210x_driver, 166 .id_table = id_table, 167 .num_ports = 1, 168 .bulk_in_size = 256, 169 .bulk_out_size = 256, 170 .open = cp210x_open, 171 .close = cp210x_close, 172 .break_ctl = cp210x_break_ctl, 173 .set_termios = cp210x_set_termios, 174 .tiocmget = cp210x_tiocmget, 175 .tiocmset = cp210x_tiocmset, 176 .attach = cp210x_startup, 177 .dtr_rts = cp210x_dtr_rts 178 }; 179 180 /* Config request types */ 181 #define REQTYPE_HOST_TO_DEVICE 0x41 182 #define REQTYPE_DEVICE_TO_HOST 0xc1 183 184 /* Config request codes */ 185 #define CP210X_IFC_ENABLE 0x00 186 #define CP210X_SET_BAUDDIV 0x01 187 #define CP210X_GET_BAUDDIV 0x02 188 #define CP210X_SET_LINE_CTL 0x03 189 #define CP210X_GET_LINE_CTL 0x04 190 #define CP210X_SET_BREAK 0x05 191 #define CP210X_IMM_CHAR 0x06 192 #define CP210X_SET_MHS 0x07 193 #define CP210X_GET_MDMSTS 0x08 194 #define CP210X_SET_XON 0x09 195 #define CP210X_SET_XOFF 0x0A 196 #define CP210X_SET_EVENTMASK 0x0B 197 #define CP210X_GET_EVENTMASK 0x0C 198 #define CP210X_SET_CHAR 0x0D 199 #define CP210X_GET_CHARS 0x0E 200 #define CP210X_GET_PROPS 0x0F 201 #define CP210X_GET_COMM_STATUS 0x10 202 #define CP210X_RESET 0x11 203 #define CP210X_PURGE 0x12 204 #define CP210X_SET_FLOW 0x13 205 #define CP210X_GET_FLOW 0x14 206 #define CP210X_EMBED_EVENTS 0x15 207 #define CP210X_GET_EVENTSTATE 0x16 208 #define CP210X_SET_CHARS 0x19 209 #define CP210X_GET_BAUDRATE 0x1D 210 #define CP210X_SET_BAUDRATE 0x1E 211 212 /* CP210X_IFC_ENABLE */ 213 #define UART_ENABLE 0x0001 214 #define UART_DISABLE 0x0000 215 216 /* CP210X_(SET|GET)_BAUDDIV */ 217 #define BAUD_RATE_GEN_FREQ 0x384000 218 219 /* CP210X_(SET|GET)_LINE_CTL */ 220 #define BITS_DATA_MASK 0X0f00 221 #define BITS_DATA_5 0X0500 222 #define BITS_DATA_6 0X0600 223 #define BITS_DATA_7 0X0700 224 #define BITS_DATA_8 0X0800 225 #define BITS_DATA_9 0X0900 226 227 #define BITS_PARITY_MASK 0x00f0 228 #define BITS_PARITY_NONE 0x0000 229 #define BITS_PARITY_ODD 0x0010 230 #define BITS_PARITY_EVEN 0x0020 231 #define BITS_PARITY_MARK 0x0030 232 #define BITS_PARITY_SPACE 0x0040 233 234 #define BITS_STOP_MASK 0x000f 235 #define BITS_STOP_1 0x0000 236 #define BITS_STOP_1_5 0x0001 237 #define BITS_STOP_2 0x0002 238 239 /* CP210X_SET_BREAK */ 240 #define BREAK_ON 0x0001 241 #define BREAK_OFF 0x0000 242 243 /* CP210X_(SET_MHS|GET_MDMSTS) */ 244 #define CONTROL_DTR 0x0001 245 #define CONTROL_RTS 0x0002 246 #define CONTROL_CTS 0x0010 247 #define CONTROL_DSR 0x0020 248 #define CONTROL_RING 0x0040 249 #define CONTROL_DCD 0x0080 250 #define CONTROL_WRITE_DTR 0x0100 251 #define CONTROL_WRITE_RTS 0x0200 252 253 /* 254 * cp210x_get_config 255 * Reads from the CP210x configuration registers 256 * 'size' is specified in bytes. 257 * 'data' is a pointer to a pre-allocated array of integers large 258 * enough to hold 'size' bytes (with 4 bytes to each integer) 259 */ 260 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 261 unsigned int *data, int size) 262 { 263 struct usb_serial *serial = port->serial; 264 __le32 *buf; 265 int result, i, length; 266 267 /* Number of integers required to contain the array */ 268 length = (((size - 1) | 3) + 1)/4; 269 270 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 271 if (!buf) { 272 dev_err(&port->dev, "%s - out of memory.\n", __func__); 273 return -ENOMEM; 274 } 275 276 /* Issue the request, attempting to read 'size' bytes */ 277 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 278 request, REQTYPE_DEVICE_TO_HOST, 0x0000, 279 0, buf, size, 300); 280 281 /* Convert data into an array of integers */ 282 for (i = 0; i < length; i++) 283 data[i] = le32_to_cpu(buf[i]); 284 285 kfree(buf); 286 287 if (result != size) { 288 dbg("%s - Unable to send config request, " 289 "request=0x%x size=%d result=%d\n", 290 __func__, request, size, result); 291 if (result > 0) 292 result = -EPROTO; 293 294 return result; 295 } 296 297 return 0; 298 } 299 300 /* 301 * cp210x_set_config 302 * Writes to the CP210x configuration registers 303 * Values less than 16 bits wide are sent directly 304 * 'size' is specified in bytes. 305 */ 306 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 307 unsigned int *data, int size) 308 { 309 struct usb_serial *serial = port->serial; 310 __le32 *buf; 311 int result, i, length; 312 313 /* Number of integers required to contain the array */ 314 length = (((size - 1) | 3) + 1)/4; 315 316 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 317 if (!buf) { 318 dev_err(&port->dev, "%s - out of memory.\n", 319 __func__); 320 return -ENOMEM; 321 } 322 323 /* Array of integers into bytes */ 324 for (i = 0; i < length; i++) 325 buf[i] = cpu_to_le32(data[i]); 326 327 if (size > 2) { 328 result = usb_control_msg(serial->dev, 329 usb_sndctrlpipe(serial->dev, 0), 330 request, REQTYPE_HOST_TO_DEVICE, 0x0000, 331 0, buf, size, 300); 332 } else { 333 result = usb_control_msg(serial->dev, 334 usb_sndctrlpipe(serial->dev, 0), 335 request, REQTYPE_HOST_TO_DEVICE, data[0], 336 0, NULL, 0, 300); 337 } 338 339 kfree(buf); 340 341 if ((size > 2 && result != size) || result < 0) { 342 dbg("%s - Unable to send request, " 343 "request=0x%x size=%d result=%d\n", 344 __func__, request, size, result); 345 if (result > 0) 346 result = -EPROTO; 347 348 return result; 349 } 350 351 return 0; 352 } 353 354 /* 355 * cp210x_set_config_single 356 * Convenience function for calling cp210x_set_config on single data values 357 * without requiring an integer pointer 358 */ 359 static inline int cp210x_set_config_single(struct usb_serial_port *port, 360 u8 request, unsigned int data) 361 { 362 return cp210x_set_config(port, request, &data, 2); 363 } 364 365 /* 366 * cp210x_quantise_baudrate 367 * Quantises the baud rate as per AN205 Table 1 368 */ 369 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 370 if (baud <= 300) 371 baud = 300; 372 else if (baud <= 600) baud = 600; 373 else if (baud <= 1200) baud = 1200; 374 else if (baud <= 1800) baud = 1800; 375 else if (baud <= 2400) baud = 2400; 376 else if (baud <= 4000) baud = 4000; 377 else if (baud <= 4803) baud = 4800; 378 else if (baud <= 7207) baud = 7200; 379 else if (baud <= 9612) baud = 9600; 380 else if (baud <= 14428) baud = 14400; 381 else if (baud <= 16062) baud = 16000; 382 else if (baud <= 19250) baud = 19200; 383 else if (baud <= 28912) baud = 28800; 384 else if (baud <= 38601) baud = 38400; 385 else if (baud <= 51558) baud = 51200; 386 else if (baud <= 56280) baud = 56000; 387 else if (baud <= 58053) baud = 57600; 388 else if (baud <= 64111) baud = 64000; 389 else if (baud <= 77608) baud = 76800; 390 else if (baud <= 117028) baud = 115200; 391 else if (baud <= 129347) baud = 128000; 392 else if (baud <= 156868) baud = 153600; 393 else if (baud <= 237832) baud = 230400; 394 else if (baud <= 254234) baud = 250000; 395 else if (baud <= 273066) baud = 256000; 396 else if (baud <= 491520) baud = 460800; 397 else if (baud <= 567138) baud = 500000; 398 else if (baud <= 670254) baud = 576000; 399 else if (baud < 1000000) 400 baud = 921600; 401 else if (baud > 2000000) 402 baud = 2000000; 403 return baud; 404 } 405 406 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 407 { 408 int result; 409 410 dbg("%s - port %d", __func__, port->number); 411 412 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 413 UART_ENABLE); 414 if (result) { 415 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 416 return result; 417 } 418 419 /* Configure the termios structure */ 420 cp210x_get_termios(tty, port); 421 422 /* The baud rate must be initialised on cp2104 */ 423 if (tty) 424 cp210x_change_speed(tty, port, NULL); 425 426 return usb_serial_generic_open(tty, port); 427 } 428 429 static void cp210x_close(struct usb_serial_port *port) 430 { 431 dbg("%s - port %d", __func__, port->number); 432 433 usb_serial_generic_close(port); 434 435 mutex_lock(&port->serial->disc_mutex); 436 if (!port->serial->disconnected) 437 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 438 mutex_unlock(&port->serial->disc_mutex); 439 } 440 441 /* 442 * cp210x_get_termios 443 * Reads the baud rate, data bits, parity, stop bits and flow control mode 444 * from the device, corrects any unsupported values, and configures the 445 * termios structure to reflect the state of the device 446 */ 447 static void cp210x_get_termios(struct tty_struct *tty, 448 struct usb_serial_port *port) 449 { 450 unsigned int baud; 451 452 if (tty) { 453 cp210x_get_termios_port(tty->driver_data, 454 &tty->termios->c_cflag, &baud); 455 tty_encode_baud_rate(tty, baud, baud); 456 } 457 458 else { 459 unsigned int cflag; 460 cflag = 0; 461 cp210x_get_termios_port(port, &cflag, &baud); 462 } 463 } 464 465 /* 466 * cp210x_get_termios_port 467 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 468 */ 469 static void cp210x_get_termios_port(struct usb_serial_port *port, 470 unsigned int *cflagp, unsigned int *baudp) 471 { 472 unsigned int cflag, modem_ctl[4]; 473 unsigned int baud; 474 unsigned int bits; 475 476 dbg("%s - port %d", __func__, port->number); 477 478 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 479 480 dbg("%s - baud rate = %d", __func__, baud); 481 *baudp = baud; 482 483 cflag = *cflagp; 484 485 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 486 cflag &= ~CSIZE; 487 switch (bits & BITS_DATA_MASK) { 488 case BITS_DATA_5: 489 dbg("%s - data bits = 5", __func__); 490 cflag |= CS5; 491 break; 492 case BITS_DATA_6: 493 dbg("%s - data bits = 6", __func__); 494 cflag |= CS6; 495 break; 496 case BITS_DATA_7: 497 dbg("%s - data bits = 7", __func__); 498 cflag |= CS7; 499 break; 500 case BITS_DATA_8: 501 dbg("%s - data bits = 8", __func__); 502 cflag |= CS8; 503 break; 504 case BITS_DATA_9: 505 dbg("%s - data bits = 9 (not supported, using 8 data bits)", 506 __func__); 507 cflag |= CS8; 508 bits &= ~BITS_DATA_MASK; 509 bits |= BITS_DATA_8; 510 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 511 break; 512 default: 513 dbg("%s - Unknown number of data bits, using 8", __func__); 514 cflag |= CS8; 515 bits &= ~BITS_DATA_MASK; 516 bits |= BITS_DATA_8; 517 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 518 break; 519 } 520 521 switch (bits & BITS_PARITY_MASK) { 522 case BITS_PARITY_NONE: 523 dbg("%s - parity = NONE", __func__); 524 cflag &= ~PARENB; 525 break; 526 case BITS_PARITY_ODD: 527 dbg("%s - parity = ODD", __func__); 528 cflag |= (PARENB|PARODD); 529 break; 530 case BITS_PARITY_EVEN: 531 dbg("%s - parity = EVEN", __func__); 532 cflag &= ~PARODD; 533 cflag |= PARENB; 534 break; 535 case BITS_PARITY_MARK: 536 dbg("%s - parity = MARK", __func__); 537 cflag |= (PARENB|PARODD|CMSPAR); 538 break; 539 case BITS_PARITY_SPACE: 540 dbg("%s - parity = SPACE", __func__); 541 cflag &= ~PARODD; 542 cflag |= (PARENB|CMSPAR); 543 break; 544 default: 545 dbg("%s - Unknown parity mode, disabling parity", __func__); 546 cflag &= ~PARENB; 547 bits &= ~BITS_PARITY_MASK; 548 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 549 break; 550 } 551 552 cflag &= ~CSTOPB; 553 switch (bits & BITS_STOP_MASK) { 554 case BITS_STOP_1: 555 dbg("%s - stop bits = 1", __func__); 556 break; 557 case BITS_STOP_1_5: 558 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)", 559 __func__); 560 bits &= ~BITS_STOP_MASK; 561 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 562 break; 563 case BITS_STOP_2: 564 dbg("%s - stop bits = 2", __func__); 565 cflag |= CSTOPB; 566 break; 567 default: 568 dbg("%s - Unknown number of stop bits, using 1 stop bit", 569 __func__); 570 bits &= ~BITS_STOP_MASK; 571 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 572 break; 573 } 574 575 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 576 if (modem_ctl[0] & 0x0008) { 577 dbg("%s - flow control = CRTSCTS", __func__); 578 cflag |= CRTSCTS; 579 } else { 580 dbg("%s - flow control = NONE", __func__); 581 cflag &= ~CRTSCTS; 582 } 583 584 *cflagp = cflag; 585 } 586 587 /* 588 * CP2101 supports the following baud rates: 589 * 590 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 591 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 592 * 593 * CP2102 and CP2103 support the following additional rates: 594 * 595 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 596 * 576000 597 * 598 * The device will map a requested rate to a supported one, but the result 599 * of requests for rates greater than 1053257 is undefined (see AN205). 600 * 601 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 602 * respectively, with an error less than 1%. The actual rates are determined 603 * by 604 * 605 * div = round(freq / (2 x prescale x request)) 606 * actual = freq / (2 x prescale x div) 607 * 608 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 609 * or 1 otherwise. 610 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 611 * otherwise. 612 */ 613 static void cp210x_change_speed(struct tty_struct *tty, 614 struct usb_serial_port *port, struct ktermios *old_termios) 615 { 616 u32 baud; 617 618 baud = tty->termios->c_ospeed; 619 620 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 621 * or to an arbitrary rate in [1M,2M]. 622 * 623 * NOTE: B0 is not implemented. 624 */ 625 baud = cp210x_quantise_baudrate(baud); 626 627 dbg("%s - setting baud rate to %u", __func__, baud); 628 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 629 sizeof(baud))) { 630 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 631 if (old_termios) 632 baud = old_termios->c_ospeed; 633 else 634 baud = 9600; 635 } 636 637 tty_encode_baud_rate(tty, baud, baud); 638 } 639 640 static void cp210x_set_termios(struct tty_struct *tty, 641 struct usb_serial_port *port, struct ktermios *old_termios) 642 { 643 unsigned int cflag, old_cflag; 644 unsigned int bits; 645 unsigned int modem_ctl[4]; 646 647 dbg("%s - port %d", __func__, port->number); 648 649 if (!tty) 650 return; 651 652 cflag = tty->termios->c_cflag; 653 old_cflag = old_termios->c_cflag; 654 655 if (tty->termios->c_ospeed != old_termios->c_ospeed) 656 cp210x_change_speed(tty, port, old_termios); 657 658 /* If the number of data bits is to be updated */ 659 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 660 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 661 bits &= ~BITS_DATA_MASK; 662 switch (cflag & CSIZE) { 663 case CS5: 664 bits |= BITS_DATA_5; 665 dbg("%s - data bits = 5", __func__); 666 break; 667 case CS6: 668 bits |= BITS_DATA_6; 669 dbg("%s - data bits = 6", __func__); 670 break; 671 case CS7: 672 bits |= BITS_DATA_7; 673 dbg("%s - data bits = 7", __func__); 674 break; 675 case CS8: 676 bits |= BITS_DATA_8; 677 dbg("%s - data bits = 8", __func__); 678 break; 679 /*case CS9: 680 bits |= BITS_DATA_9; 681 dbg("%s - data bits = 9", __func__); 682 break;*/ 683 default: 684 dbg("cp210x driver does not " 685 "support the number of bits requested," 686 " using 8 bit mode\n"); 687 bits |= BITS_DATA_8; 688 break; 689 } 690 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 691 dbg("Number of data bits requested " 692 "not supported by device\n"); 693 } 694 695 if ((cflag & (PARENB|PARODD|CMSPAR)) != 696 (old_cflag & (PARENB|PARODD|CMSPAR))) { 697 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 698 bits &= ~BITS_PARITY_MASK; 699 if (cflag & PARENB) { 700 if (cflag & CMSPAR) { 701 if (cflag & PARODD) { 702 bits |= BITS_PARITY_MARK; 703 dbg("%s - parity = MARK", __func__); 704 } else { 705 bits |= BITS_PARITY_SPACE; 706 dbg("%s - parity = SPACE", __func__); 707 } 708 } else { 709 if (cflag & PARODD) { 710 bits |= BITS_PARITY_ODD; 711 dbg("%s - parity = ODD", __func__); 712 } else { 713 bits |= BITS_PARITY_EVEN; 714 dbg("%s - parity = EVEN", __func__); 715 } 716 } 717 } 718 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 719 dbg("Parity mode not supported " 720 "by device\n"); 721 } 722 723 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 724 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 725 bits &= ~BITS_STOP_MASK; 726 if (cflag & CSTOPB) { 727 bits |= BITS_STOP_2; 728 dbg("%s - stop bits = 2", __func__); 729 } else { 730 bits |= BITS_STOP_1; 731 dbg("%s - stop bits = 1", __func__); 732 } 733 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 734 dbg("Number of stop bits requested " 735 "not supported by device\n"); 736 } 737 738 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 739 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 740 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 741 __func__, modem_ctl[0], modem_ctl[1], 742 modem_ctl[2], modem_ctl[3]); 743 744 if (cflag & CRTSCTS) { 745 modem_ctl[0] &= ~0x7B; 746 modem_ctl[0] |= 0x09; 747 modem_ctl[1] = 0x80; 748 dbg("%s - flow control = CRTSCTS", __func__); 749 } else { 750 modem_ctl[0] &= ~0x7B; 751 modem_ctl[0] |= 0x01; 752 modem_ctl[1] |= 0x40; 753 dbg("%s - flow control = NONE", __func__); 754 } 755 756 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 757 __func__, modem_ctl[0], modem_ctl[1], 758 modem_ctl[2], modem_ctl[3]); 759 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 760 } 761 762 } 763 764 static int cp210x_tiocmset (struct tty_struct *tty, 765 unsigned int set, unsigned int clear) 766 { 767 struct usb_serial_port *port = tty->driver_data; 768 return cp210x_tiocmset_port(port, set, clear); 769 } 770 771 static int cp210x_tiocmset_port(struct usb_serial_port *port, 772 unsigned int set, unsigned int clear) 773 { 774 unsigned int control = 0; 775 776 dbg("%s - port %d", __func__, port->number); 777 778 if (set & TIOCM_RTS) { 779 control |= CONTROL_RTS; 780 control |= CONTROL_WRITE_RTS; 781 } 782 if (set & TIOCM_DTR) { 783 control |= CONTROL_DTR; 784 control |= CONTROL_WRITE_DTR; 785 } 786 if (clear & TIOCM_RTS) { 787 control &= ~CONTROL_RTS; 788 control |= CONTROL_WRITE_RTS; 789 } 790 if (clear & TIOCM_DTR) { 791 control &= ~CONTROL_DTR; 792 control |= CONTROL_WRITE_DTR; 793 } 794 795 dbg("%s - control = 0x%.4x", __func__, control); 796 797 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 798 } 799 800 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 801 { 802 if (on) 803 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 804 else 805 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 806 } 807 808 static int cp210x_tiocmget (struct tty_struct *tty) 809 { 810 struct usb_serial_port *port = tty->driver_data; 811 unsigned int control; 812 int result; 813 814 dbg("%s - port %d", __func__, port->number); 815 816 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 817 818 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 819 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 820 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 821 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 822 |((control & CONTROL_RING)? TIOCM_RI : 0) 823 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 824 825 dbg("%s - control = 0x%.2x", __func__, control); 826 827 return result; 828 } 829 830 static void cp210x_break_ctl (struct tty_struct *tty, int break_state) 831 { 832 struct usb_serial_port *port = tty->driver_data; 833 unsigned int state; 834 835 dbg("%s - port %d", __func__, port->number); 836 if (break_state == 0) 837 state = BREAK_OFF; 838 else 839 state = BREAK_ON; 840 dbg("%s - turning break %s", __func__, 841 state == BREAK_OFF ? "off" : "on"); 842 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 843 } 844 845 static int cp210x_startup(struct usb_serial *serial) 846 { 847 /* cp210x buffers behave strangely unless device is reset */ 848 usb_reset_device(serial->dev); 849 return 0; 850 } 851 852 static int __init cp210x_init(void) 853 { 854 int retval; 855 856 retval = usb_serial_register(&cp210x_device); 857 if (retval) 858 return retval; /* Failed to register */ 859 860 retval = usb_register(&cp210x_driver); 861 if (retval) { 862 /* Failed to register */ 863 usb_serial_deregister(&cp210x_device); 864 return retval; 865 } 866 867 /* Success */ 868 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 869 DRIVER_DESC "\n"); 870 return 0; 871 } 872 873 static void __exit cp210x_exit(void) 874 { 875 usb_deregister(&cp210x_driver); 876 usb_serial_deregister(&cp210x_device); 877 } 878 879 module_init(cp210x_init); 880 module_exit(cp210x_exit); 881 882 MODULE_DESCRIPTION(DRIVER_DESC); 883 MODULE_VERSION(DRIVER_VERSION); 884 MODULE_LICENSE("GPL"); 885 886 module_param(debug, bool, S_IRUGO | S_IWUSR); 887 MODULE_PARM_DESC(debug, "Enable verbose debugging messages"); 888