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_release(struct usb_serial *); 53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 54 55 static bool debug; 56 57 static const struct usb_device_id id_table[] = { 58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 63 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 64 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 94 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 95 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 96 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 97 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 98 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 99 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 100 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 101 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 102 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 103 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 104 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 105 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 106 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 107 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 108 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 109 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 110 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 111 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 112 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 113 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 114 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 115 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 116 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 117 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 118 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 119 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 120 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 121 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 122 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 123 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 124 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 125 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 126 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 127 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 128 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 129 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 130 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 131 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 132 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 133 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 134 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 135 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 136 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 137 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 138 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 139 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 140 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 141 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 142 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 143 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 144 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 145 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 146 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 147 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 148 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 149 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 150 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 151 { } /* Terminating Entry */ 152 }; 153 154 MODULE_DEVICE_TABLE(usb, id_table); 155 156 struct cp210x_port_private { 157 __u8 bInterfaceNumber; 158 }; 159 160 static struct usb_serial_driver cp210x_device = { 161 .driver = { 162 .owner = THIS_MODULE, 163 .name = "cp210x", 164 }, 165 .id_table = id_table, 166 .num_ports = 1, 167 .bulk_in_size = 256, 168 .bulk_out_size = 256, 169 .open = cp210x_open, 170 .close = cp210x_close, 171 .break_ctl = cp210x_break_ctl, 172 .set_termios = cp210x_set_termios, 173 .tiocmget = cp210x_tiocmget, 174 .tiocmset = cp210x_tiocmset, 175 .attach = cp210x_startup, 176 .release = cp210x_release, 177 .dtr_rts = cp210x_dtr_rts 178 }; 179 180 static struct usb_serial_driver * const serial_drivers[] = { 181 &cp210x_device, NULL 182 }; 183 184 /* Config request types */ 185 #define REQTYPE_HOST_TO_INTERFACE 0x41 186 #define REQTYPE_INTERFACE_TO_HOST 0xc1 187 #define REQTYPE_HOST_TO_DEVICE 0x40 188 #define REQTYPE_DEVICE_TO_HOST 0xc0 189 190 /* Config request codes */ 191 #define CP210X_IFC_ENABLE 0x00 192 #define CP210X_SET_BAUDDIV 0x01 193 #define CP210X_GET_BAUDDIV 0x02 194 #define CP210X_SET_LINE_CTL 0x03 195 #define CP210X_GET_LINE_CTL 0x04 196 #define CP210X_SET_BREAK 0x05 197 #define CP210X_IMM_CHAR 0x06 198 #define CP210X_SET_MHS 0x07 199 #define CP210X_GET_MDMSTS 0x08 200 #define CP210X_SET_XON 0x09 201 #define CP210X_SET_XOFF 0x0A 202 #define CP210X_SET_EVENTMASK 0x0B 203 #define CP210X_GET_EVENTMASK 0x0C 204 #define CP210X_SET_CHAR 0x0D 205 #define CP210X_GET_CHARS 0x0E 206 #define CP210X_GET_PROPS 0x0F 207 #define CP210X_GET_COMM_STATUS 0x10 208 #define CP210X_RESET 0x11 209 #define CP210X_PURGE 0x12 210 #define CP210X_SET_FLOW 0x13 211 #define CP210X_GET_FLOW 0x14 212 #define CP210X_EMBED_EVENTS 0x15 213 #define CP210X_GET_EVENTSTATE 0x16 214 #define CP210X_SET_CHARS 0x19 215 #define CP210X_GET_BAUDRATE 0x1D 216 #define CP210X_SET_BAUDRATE 0x1E 217 218 /* CP210X_IFC_ENABLE */ 219 #define UART_ENABLE 0x0001 220 #define UART_DISABLE 0x0000 221 222 /* CP210X_(SET|GET)_BAUDDIV */ 223 #define BAUD_RATE_GEN_FREQ 0x384000 224 225 /* CP210X_(SET|GET)_LINE_CTL */ 226 #define BITS_DATA_MASK 0X0f00 227 #define BITS_DATA_5 0X0500 228 #define BITS_DATA_6 0X0600 229 #define BITS_DATA_7 0X0700 230 #define BITS_DATA_8 0X0800 231 #define BITS_DATA_9 0X0900 232 233 #define BITS_PARITY_MASK 0x00f0 234 #define BITS_PARITY_NONE 0x0000 235 #define BITS_PARITY_ODD 0x0010 236 #define BITS_PARITY_EVEN 0x0020 237 #define BITS_PARITY_MARK 0x0030 238 #define BITS_PARITY_SPACE 0x0040 239 240 #define BITS_STOP_MASK 0x000f 241 #define BITS_STOP_1 0x0000 242 #define BITS_STOP_1_5 0x0001 243 #define BITS_STOP_2 0x0002 244 245 /* CP210X_SET_BREAK */ 246 #define BREAK_ON 0x0001 247 #define BREAK_OFF 0x0000 248 249 /* CP210X_(SET_MHS|GET_MDMSTS) */ 250 #define CONTROL_DTR 0x0001 251 #define CONTROL_RTS 0x0002 252 #define CONTROL_CTS 0x0010 253 #define CONTROL_DSR 0x0020 254 #define CONTROL_RING 0x0040 255 #define CONTROL_DCD 0x0080 256 #define CONTROL_WRITE_DTR 0x0100 257 #define CONTROL_WRITE_RTS 0x0200 258 259 /* 260 * cp210x_get_config 261 * Reads from the CP210x configuration registers 262 * 'size' is specified in bytes. 263 * 'data' is a pointer to a pre-allocated array of integers large 264 * enough to hold 'size' bytes (with 4 bytes to each integer) 265 */ 266 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 267 unsigned int *data, int size) 268 { 269 struct usb_serial *serial = port->serial; 270 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 271 __le32 *buf; 272 int result, i, length; 273 274 /* Number of integers required to contain the array */ 275 length = (((size - 1) | 3) + 1)/4; 276 277 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 278 if (!buf) { 279 dev_err(&port->dev, "%s - out of memory.\n", __func__); 280 return -ENOMEM; 281 } 282 283 /* Issue the request, attempting to read 'size' bytes */ 284 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 285 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 286 port_priv->bInterfaceNumber, buf, size, 287 USB_CTRL_GET_TIMEOUT); 288 289 /* Convert data into an array of integers */ 290 for (i = 0; i < length; i++) 291 data[i] = le32_to_cpu(buf[i]); 292 293 kfree(buf); 294 295 if (result != size) { 296 dbg("%s - Unable to send config request, " 297 "request=0x%x size=%d result=%d", 298 __func__, request, size, result); 299 if (result > 0) 300 result = -EPROTO; 301 302 return result; 303 } 304 305 return 0; 306 } 307 308 /* 309 * cp210x_set_config 310 * Writes to the CP210x configuration registers 311 * Values less than 16 bits wide are sent directly 312 * 'size' is specified in bytes. 313 */ 314 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 315 unsigned int *data, int size) 316 { 317 struct usb_serial *serial = port->serial; 318 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 319 __le32 *buf; 320 int result, i, length; 321 322 /* Number of integers required to contain the array */ 323 length = (((size - 1) | 3) + 1)/4; 324 325 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 326 if (!buf) { 327 dev_err(&port->dev, "%s - out of memory.\n", 328 __func__); 329 return -ENOMEM; 330 } 331 332 /* Array of integers into bytes */ 333 for (i = 0; i < length; i++) 334 buf[i] = cpu_to_le32(data[i]); 335 336 if (size > 2) { 337 result = usb_control_msg(serial->dev, 338 usb_sndctrlpipe(serial->dev, 0), 339 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 340 port_priv->bInterfaceNumber, buf, size, 341 USB_CTRL_SET_TIMEOUT); 342 } else { 343 result = usb_control_msg(serial->dev, 344 usb_sndctrlpipe(serial->dev, 0), 345 request, REQTYPE_HOST_TO_INTERFACE, data[0], 346 port_priv->bInterfaceNumber, NULL, 0, 347 USB_CTRL_SET_TIMEOUT); 348 } 349 350 kfree(buf); 351 352 if ((size > 2 && result != size) || result < 0) { 353 dbg("%s - Unable to send request, " 354 "request=0x%x size=%d result=%d", 355 __func__, request, size, result); 356 if (result > 0) 357 result = -EPROTO; 358 359 return result; 360 } 361 362 return 0; 363 } 364 365 /* 366 * cp210x_set_config_single 367 * Convenience function for calling cp210x_set_config on single data values 368 * without requiring an integer pointer 369 */ 370 static inline int cp210x_set_config_single(struct usb_serial_port *port, 371 u8 request, unsigned int data) 372 { 373 return cp210x_set_config(port, request, &data, 2); 374 } 375 376 /* 377 * cp210x_quantise_baudrate 378 * Quantises the baud rate as per AN205 Table 1 379 */ 380 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 381 if (baud <= 300) 382 baud = 300; 383 else if (baud <= 600) baud = 600; 384 else if (baud <= 1200) baud = 1200; 385 else if (baud <= 1800) baud = 1800; 386 else if (baud <= 2400) baud = 2400; 387 else if (baud <= 4000) baud = 4000; 388 else if (baud <= 4803) baud = 4800; 389 else if (baud <= 7207) baud = 7200; 390 else if (baud <= 9612) baud = 9600; 391 else if (baud <= 14428) baud = 14400; 392 else if (baud <= 16062) baud = 16000; 393 else if (baud <= 19250) baud = 19200; 394 else if (baud <= 28912) baud = 28800; 395 else if (baud <= 38601) baud = 38400; 396 else if (baud <= 51558) baud = 51200; 397 else if (baud <= 56280) baud = 56000; 398 else if (baud <= 58053) baud = 57600; 399 else if (baud <= 64111) baud = 64000; 400 else if (baud <= 77608) baud = 76800; 401 else if (baud <= 117028) baud = 115200; 402 else if (baud <= 129347) baud = 128000; 403 else if (baud <= 156868) baud = 153600; 404 else if (baud <= 237832) baud = 230400; 405 else if (baud <= 254234) baud = 250000; 406 else if (baud <= 273066) baud = 256000; 407 else if (baud <= 491520) baud = 460800; 408 else if (baud <= 567138) baud = 500000; 409 else if (baud <= 670254) baud = 576000; 410 else if (baud < 1000000) 411 baud = 921600; 412 else if (baud > 2000000) 413 baud = 2000000; 414 return baud; 415 } 416 417 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 418 { 419 int result; 420 421 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 422 UART_ENABLE); 423 if (result) { 424 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 425 return result; 426 } 427 428 /* Configure the termios structure */ 429 cp210x_get_termios(tty, port); 430 431 /* The baud rate must be initialised on cp2104 */ 432 if (tty) 433 cp210x_change_speed(tty, port, NULL); 434 435 return usb_serial_generic_open(tty, port); 436 } 437 438 static void cp210x_close(struct usb_serial_port *port) 439 { 440 usb_serial_generic_close(port); 441 442 mutex_lock(&port->serial->disc_mutex); 443 if (!port->serial->disconnected) 444 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 445 mutex_unlock(&port->serial->disc_mutex); 446 } 447 448 /* 449 * cp210x_get_termios 450 * Reads the baud rate, data bits, parity, stop bits and flow control mode 451 * from the device, corrects any unsupported values, and configures the 452 * termios structure to reflect the state of the device 453 */ 454 static void cp210x_get_termios(struct tty_struct *tty, 455 struct usb_serial_port *port) 456 { 457 unsigned int baud; 458 459 if (tty) { 460 cp210x_get_termios_port(tty->driver_data, 461 &tty->termios->c_cflag, &baud); 462 tty_encode_baud_rate(tty, baud, baud); 463 } 464 465 else { 466 unsigned int cflag; 467 cflag = 0; 468 cp210x_get_termios_port(port, &cflag, &baud); 469 } 470 } 471 472 /* 473 * cp210x_get_termios_port 474 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 475 */ 476 static void cp210x_get_termios_port(struct usb_serial_port *port, 477 unsigned int *cflagp, unsigned int *baudp) 478 { 479 unsigned int cflag, modem_ctl[4]; 480 unsigned int baud; 481 unsigned int bits; 482 483 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 484 485 dbg("%s - baud rate = %d", __func__, baud); 486 *baudp = baud; 487 488 cflag = *cflagp; 489 490 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 491 cflag &= ~CSIZE; 492 switch (bits & BITS_DATA_MASK) { 493 case BITS_DATA_5: 494 dbg("%s - data bits = 5", __func__); 495 cflag |= CS5; 496 break; 497 case BITS_DATA_6: 498 dbg("%s - data bits = 6", __func__); 499 cflag |= CS6; 500 break; 501 case BITS_DATA_7: 502 dbg("%s - data bits = 7", __func__); 503 cflag |= CS7; 504 break; 505 case BITS_DATA_8: 506 dbg("%s - data bits = 8", __func__); 507 cflag |= CS8; 508 break; 509 case BITS_DATA_9: 510 dbg("%s - data bits = 9 (not supported, using 8 data bits)", 511 __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 default: 518 dbg("%s - Unknown number of data bits, using 8", __func__); 519 cflag |= CS8; 520 bits &= ~BITS_DATA_MASK; 521 bits |= BITS_DATA_8; 522 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 523 break; 524 } 525 526 switch (bits & BITS_PARITY_MASK) { 527 case BITS_PARITY_NONE: 528 dbg("%s - parity = NONE", __func__); 529 cflag &= ~PARENB; 530 break; 531 case BITS_PARITY_ODD: 532 dbg("%s - parity = ODD", __func__); 533 cflag |= (PARENB|PARODD); 534 break; 535 case BITS_PARITY_EVEN: 536 dbg("%s - parity = EVEN", __func__); 537 cflag &= ~PARODD; 538 cflag |= PARENB; 539 break; 540 case BITS_PARITY_MARK: 541 dbg("%s - parity = MARK", __func__); 542 cflag |= (PARENB|PARODD|CMSPAR); 543 break; 544 case BITS_PARITY_SPACE: 545 dbg("%s - parity = SPACE", __func__); 546 cflag &= ~PARODD; 547 cflag |= (PARENB|CMSPAR); 548 break; 549 default: 550 dbg("%s - Unknown parity mode, disabling parity", __func__); 551 cflag &= ~PARENB; 552 bits &= ~BITS_PARITY_MASK; 553 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 554 break; 555 } 556 557 cflag &= ~CSTOPB; 558 switch (bits & BITS_STOP_MASK) { 559 case BITS_STOP_1: 560 dbg("%s - stop bits = 1", __func__); 561 break; 562 case BITS_STOP_1_5: 563 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)", 564 __func__); 565 bits &= ~BITS_STOP_MASK; 566 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 567 break; 568 case BITS_STOP_2: 569 dbg("%s - stop bits = 2", __func__); 570 cflag |= CSTOPB; 571 break; 572 default: 573 dbg("%s - Unknown number of stop bits, using 1 stop bit", 574 __func__); 575 bits &= ~BITS_STOP_MASK; 576 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 577 break; 578 } 579 580 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 581 if (modem_ctl[0] & 0x0008) { 582 dbg("%s - flow control = CRTSCTS", __func__); 583 cflag |= CRTSCTS; 584 } else { 585 dbg("%s - flow control = NONE", __func__); 586 cflag &= ~CRTSCTS; 587 } 588 589 *cflagp = cflag; 590 } 591 592 /* 593 * CP2101 supports the following baud rates: 594 * 595 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 596 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 597 * 598 * CP2102 and CP2103 support the following additional rates: 599 * 600 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 601 * 576000 602 * 603 * The device will map a requested rate to a supported one, but the result 604 * of requests for rates greater than 1053257 is undefined (see AN205). 605 * 606 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 607 * respectively, with an error less than 1%. The actual rates are determined 608 * by 609 * 610 * div = round(freq / (2 x prescale x request)) 611 * actual = freq / (2 x prescale x div) 612 * 613 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 614 * or 1 otherwise. 615 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 616 * otherwise. 617 */ 618 static void cp210x_change_speed(struct tty_struct *tty, 619 struct usb_serial_port *port, struct ktermios *old_termios) 620 { 621 u32 baud; 622 623 baud = tty->termios->c_ospeed; 624 625 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 626 * or to an arbitrary rate in [1M,2M]. 627 * 628 * NOTE: B0 is not implemented. 629 */ 630 baud = cp210x_quantise_baudrate(baud); 631 632 dbg("%s - setting baud rate to %u", __func__, baud); 633 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 634 sizeof(baud))) { 635 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 636 if (old_termios) 637 baud = old_termios->c_ospeed; 638 else 639 baud = 9600; 640 } 641 642 tty_encode_baud_rate(tty, baud, baud); 643 } 644 645 static void cp210x_set_termios(struct tty_struct *tty, 646 struct usb_serial_port *port, struct ktermios *old_termios) 647 { 648 unsigned int cflag, old_cflag; 649 unsigned int bits; 650 unsigned int modem_ctl[4]; 651 652 dbg("%s - port %d", __func__, port->number); 653 654 if (!tty) 655 return; 656 657 cflag = tty->termios->c_cflag; 658 old_cflag = old_termios->c_cflag; 659 660 if (tty->termios->c_ospeed != old_termios->c_ospeed) 661 cp210x_change_speed(tty, port, old_termios); 662 663 /* If the number of data bits is to be updated */ 664 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 665 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 666 bits &= ~BITS_DATA_MASK; 667 switch (cflag & CSIZE) { 668 case CS5: 669 bits |= BITS_DATA_5; 670 dbg("%s - data bits = 5", __func__); 671 break; 672 case CS6: 673 bits |= BITS_DATA_6; 674 dbg("%s - data bits = 6", __func__); 675 break; 676 case CS7: 677 bits |= BITS_DATA_7; 678 dbg("%s - data bits = 7", __func__); 679 break; 680 case CS8: 681 bits |= BITS_DATA_8; 682 dbg("%s - data bits = 8", __func__); 683 break; 684 /*case CS9: 685 bits |= BITS_DATA_9; 686 dbg("%s - data bits = 9", __func__); 687 break;*/ 688 default: 689 dbg("cp210x driver does not " 690 "support the number of bits requested," 691 " using 8 bit mode"); 692 bits |= BITS_DATA_8; 693 break; 694 } 695 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 696 dbg("Number of data bits requested " 697 "not supported by device"); 698 } 699 700 if ((cflag & (PARENB|PARODD|CMSPAR)) != 701 (old_cflag & (PARENB|PARODD|CMSPAR))) { 702 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 703 bits &= ~BITS_PARITY_MASK; 704 if (cflag & PARENB) { 705 if (cflag & CMSPAR) { 706 if (cflag & PARODD) { 707 bits |= BITS_PARITY_MARK; 708 dbg("%s - parity = MARK", __func__); 709 } else { 710 bits |= BITS_PARITY_SPACE; 711 dbg("%s - parity = SPACE", __func__); 712 } 713 } else { 714 if (cflag & PARODD) { 715 bits |= BITS_PARITY_ODD; 716 dbg("%s - parity = ODD", __func__); 717 } else { 718 bits |= BITS_PARITY_EVEN; 719 dbg("%s - parity = EVEN", __func__); 720 } 721 } 722 } 723 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 724 dbg("Parity mode not supported by device"); 725 } 726 727 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 728 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 729 bits &= ~BITS_STOP_MASK; 730 if (cflag & CSTOPB) { 731 bits |= BITS_STOP_2; 732 dbg("%s - stop bits = 2", __func__); 733 } else { 734 bits |= BITS_STOP_1; 735 dbg("%s - stop bits = 1", __func__); 736 } 737 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 738 dbg("Number of stop bits requested " 739 "not supported by device"); 740 } 741 742 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 743 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 744 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 745 __func__, modem_ctl[0], modem_ctl[1], 746 modem_ctl[2], modem_ctl[3]); 747 748 if (cflag & CRTSCTS) { 749 modem_ctl[0] &= ~0x7B; 750 modem_ctl[0] |= 0x09; 751 modem_ctl[1] = 0x80; 752 dbg("%s - flow control = CRTSCTS", __func__); 753 } else { 754 modem_ctl[0] &= ~0x7B; 755 modem_ctl[0] |= 0x01; 756 modem_ctl[1] |= 0x40; 757 dbg("%s - flow control = NONE", __func__); 758 } 759 760 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 761 __func__, modem_ctl[0], modem_ctl[1], 762 modem_ctl[2], modem_ctl[3]); 763 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 764 } 765 766 } 767 768 static int cp210x_tiocmset (struct tty_struct *tty, 769 unsigned int set, unsigned int clear) 770 { 771 struct usb_serial_port *port = tty->driver_data; 772 return cp210x_tiocmset_port(port, set, clear); 773 } 774 775 static int cp210x_tiocmset_port(struct usb_serial_port *port, 776 unsigned int set, unsigned int clear) 777 { 778 unsigned int control = 0; 779 780 if (set & TIOCM_RTS) { 781 control |= CONTROL_RTS; 782 control |= CONTROL_WRITE_RTS; 783 } 784 if (set & TIOCM_DTR) { 785 control |= CONTROL_DTR; 786 control |= CONTROL_WRITE_DTR; 787 } 788 if (clear & TIOCM_RTS) { 789 control &= ~CONTROL_RTS; 790 control |= CONTROL_WRITE_RTS; 791 } 792 if (clear & TIOCM_DTR) { 793 control &= ~CONTROL_DTR; 794 control |= CONTROL_WRITE_DTR; 795 } 796 797 dbg("%s - control = 0x%.4x", __func__, control); 798 799 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 800 } 801 802 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 803 { 804 if (on) 805 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 806 else 807 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 808 } 809 810 static int cp210x_tiocmget (struct tty_struct *tty) 811 { 812 struct usb_serial_port *port = tty->driver_data; 813 unsigned int control; 814 int result; 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 if (break_state == 0) 836 state = BREAK_OFF; 837 else 838 state = BREAK_ON; 839 dbg("%s - turning break %s", __func__, 840 state == BREAK_OFF ? "off" : "on"); 841 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 842 } 843 844 static int cp210x_startup(struct usb_serial *serial) 845 { 846 struct cp210x_port_private *port_priv; 847 int i; 848 849 /* cp210x buffers behave strangely unless device is reset */ 850 usb_reset_device(serial->dev); 851 852 for (i = 0; i < serial->num_ports; i++) { 853 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 854 if (!port_priv) 855 return -ENOMEM; 856 857 memset(port_priv, 0x00, sizeof(*port_priv)); 858 port_priv->bInterfaceNumber = 859 serial->interface->cur_altsetting->desc.bInterfaceNumber; 860 861 usb_set_serial_port_data(serial->port[i], port_priv); 862 } 863 864 return 0; 865 } 866 867 static void cp210x_release(struct usb_serial *serial) 868 { 869 struct cp210x_port_private *port_priv; 870 int i; 871 872 for (i = 0; i < serial->num_ports; i++) { 873 port_priv = usb_get_serial_port_data(serial->port[i]); 874 kfree(port_priv); 875 usb_set_serial_port_data(serial->port[i], NULL); 876 } 877 } 878 879 module_usb_serial_driver(serial_drivers, id_table); 880 881 MODULE_DESCRIPTION(DRIVER_DESC); 882 MODULE_VERSION(DRIVER_VERSION); 883 MODULE_LICENSE("GPL"); 884 885 module_param(debug, bool, S_IRUGO | S_IWUSR); 886 MODULE_PARM_DESC(debug, "Enable verbose debugging messages"); 887