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, 0x80CA) }, /* Degree Controls Inc */ 86 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 87 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 88 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 89 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 90 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 91 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 92 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 93 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 94 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 102 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 103 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 104 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 105 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 106 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 107 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 108 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 109 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 110 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 111 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 112 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 113 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 114 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 115 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 116 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 117 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 118 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 119 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 120 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 121 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 122 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 123 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 124 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 125 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 126 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 127 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 128 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 129 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 130 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 131 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 132 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 133 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 134 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 135 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 136 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 137 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 138 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 139 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 140 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 141 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 142 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 143 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 144 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 145 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 146 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 147 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 148 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 149 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 150 { } /* Terminating Entry */ 151 }; 152 153 MODULE_DEVICE_TABLE(usb, id_table); 154 155 struct cp210x_port_private { 156 __u8 bInterfaceNumber; 157 }; 158 159 static struct usb_driver cp210x_driver = { 160 .name = "cp210x", 161 .probe = usb_serial_probe, 162 .disconnect = usb_serial_disconnect, 163 .id_table = id_table, 164 }; 165 166 static struct usb_serial_driver cp210x_device = { 167 .driver = { 168 .owner = THIS_MODULE, 169 .name = "cp210x", 170 }, 171 .id_table = id_table, 172 .num_ports = 1, 173 .bulk_in_size = 256, 174 .bulk_out_size = 256, 175 .open = cp210x_open, 176 .close = cp210x_close, 177 .break_ctl = cp210x_break_ctl, 178 .set_termios = cp210x_set_termios, 179 .tiocmget = cp210x_tiocmget, 180 .tiocmset = cp210x_tiocmset, 181 .attach = cp210x_startup, 182 .release = cp210x_release, 183 .dtr_rts = cp210x_dtr_rts 184 }; 185 186 static struct usb_serial_driver * const serial_drivers[] = { 187 &cp210x_device, NULL 188 }; 189 190 /* Config request types */ 191 #define REQTYPE_HOST_TO_DEVICE 0x41 192 #define REQTYPE_DEVICE_TO_HOST 0xc1 193 194 /* Config request codes */ 195 #define CP210X_IFC_ENABLE 0x00 196 #define CP210X_SET_BAUDDIV 0x01 197 #define CP210X_GET_BAUDDIV 0x02 198 #define CP210X_SET_LINE_CTL 0x03 199 #define CP210X_GET_LINE_CTL 0x04 200 #define CP210X_SET_BREAK 0x05 201 #define CP210X_IMM_CHAR 0x06 202 #define CP210X_SET_MHS 0x07 203 #define CP210X_GET_MDMSTS 0x08 204 #define CP210X_SET_XON 0x09 205 #define CP210X_SET_XOFF 0x0A 206 #define CP210X_SET_EVENTMASK 0x0B 207 #define CP210X_GET_EVENTMASK 0x0C 208 #define CP210X_SET_CHAR 0x0D 209 #define CP210X_GET_CHARS 0x0E 210 #define CP210X_GET_PROPS 0x0F 211 #define CP210X_GET_COMM_STATUS 0x10 212 #define CP210X_RESET 0x11 213 #define CP210X_PURGE 0x12 214 #define CP210X_SET_FLOW 0x13 215 #define CP210X_GET_FLOW 0x14 216 #define CP210X_EMBED_EVENTS 0x15 217 #define CP210X_GET_EVENTSTATE 0x16 218 #define CP210X_SET_CHARS 0x19 219 #define CP210X_GET_BAUDRATE 0x1D 220 #define CP210X_SET_BAUDRATE 0x1E 221 222 /* CP210X_IFC_ENABLE */ 223 #define UART_ENABLE 0x0001 224 #define UART_DISABLE 0x0000 225 226 /* CP210X_(SET|GET)_BAUDDIV */ 227 #define BAUD_RATE_GEN_FREQ 0x384000 228 229 /* CP210X_(SET|GET)_LINE_CTL */ 230 #define BITS_DATA_MASK 0X0f00 231 #define BITS_DATA_5 0X0500 232 #define BITS_DATA_6 0X0600 233 #define BITS_DATA_7 0X0700 234 #define BITS_DATA_8 0X0800 235 #define BITS_DATA_9 0X0900 236 237 #define BITS_PARITY_MASK 0x00f0 238 #define BITS_PARITY_NONE 0x0000 239 #define BITS_PARITY_ODD 0x0010 240 #define BITS_PARITY_EVEN 0x0020 241 #define BITS_PARITY_MARK 0x0030 242 #define BITS_PARITY_SPACE 0x0040 243 244 #define BITS_STOP_MASK 0x000f 245 #define BITS_STOP_1 0x0000 246 #define BITS_STOP_1_5 0x0001 247 #define BITS_STOP_2 0x0002 248 249 /* CP210X_SET_BREAK */ 250 #define BREAK_ON 0x0001 251 #define BREAK_OFF 0x0000 252 253 /* CP210X_(SET_MHS|GET_MDMSTS) */ 254 #define CONTROL_DTR 0x0001 255 #define CONTROL_RTS 0x0002 256 #define CONTROL_CTS 0x0010 257 #define CONTROL_DSR 0x0020 258 #define CONTROL_RING 0x0040 259 #define CONTROL_DCD 0x0080 260 #define CONTROL_WRITE_DTR 0x0100 261 #define CONTROL_WRITE_RTS 0x0200 262 263 /* 264 * cp210x_get_config 265 * Reads from the CP210x configuration registers 266 * 'size' is specified in bytes. 267 * 'data' is a pointer to a pre-allocated array of integers large 268 * enough to hold 'size' bytes (with 4 bytes to each integer) 269 */ 270 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 271 unsigned int *data, int size) 272 { 273 struct usb_serial *serial = port->serial; 274 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 275 __le32 *buf; 276 int result, i, length; 277 278 /* Number of integers required to contain the array */ 279 length = (((size - 1) | 3) + 1)/4; 280 281 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 282 if (!buf) { 283 dev_err(&port->dev, "%s - out of memory.\n", __func__); 284 return -ENOMEM; 285 } 286 287 /* Issue the request, attempting to read 'size' bytes */ 288 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 289 request, REQTYPE_DEVICE_TO_HOST, 0x0000, 290 port_priv->bInterfaceNumber, buf, size, 291 USB_CTRL_GET_TIMEOUT); 292 293 /* Convert data into an array of integers */ 294 for (i = 0; i < length; i++) 295 data[i] = le32_to_cpu(buf[i]); 296 297 kfree(buf); 298 299 if (result != size) { 300 dbg("%s - Unable to send config request, " 301 "request=0x%x size=%d result=%d", 302 __func__, request, size, result); 303 if (result > 0) 304 result = -EPROTO; 305 306 return result; 307 } 308 309 return 0; 310 } 311 312 /* 313 * cp210x_set_config 314 * Writes to the CP210x configuration registers 315 * Values less than 16 bits wide are sent directly 316 * 'size' is specified in bytes. 317 */ 318 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 319 unsigned int *data, int size) 320 { 321 struct usb_serial *serial = port->serial; 322 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 323 __le32 *buf; 324 int result, i, length; 325 326 /* Number of integers required to contain the array */ 327 length = (((size - 1) | 3) + 1)/4; 328 329 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 330 if (!buf) { 331 dev_err(&port->dev, "%s - out of memory.\n", 332 __func__); 333 return -ENOMEM; 334 } 335 336 /* Array of integers into bytes */ 337 for (i = 0; i < length; i++) 338 buf[i] = cpu_to_le32(data[i]); 339 340 if (size > 2) { 341 result = usb_control_msg(serial->dev, 342 usb_sndctrlpipe(serial->dev, 0), 343 request, REQTYPE_HOST_TO_DEVICE, 0x0000, 344 port_priv->bInterfaceNumber, buf, size, 345 USB_CTRL_SET_TIMEOUT); 346 } else { 347 result = usb_control_msg(serial->dev, 348 usb_sndctrlpipe(serial->dev, 0), 349 request, REQTYPE_HOST_TO_DEVICE, data[0], 350 port_priv->bInterfaceNumber, NULL, 0, 351 USB_CTRL_SET_TIMEOUT); 352 } 353 354 kfree(buf); 355 356 if ((size > 2 && result != size) || result < 0) { 357 dbg("%s - Unable to send request, " 358 "request=0x%x size=%d result=%d", 359 __func__, request, size, result); 360 if (result > 0) 361 result = -EPROTO; 362 363 return result; 364 } 365 366 return 0; 367 } 368 369 /* 370 * cp210x_set_config_single 371 * Convenience function for calling cp210x_set_config on single data values 372 * without requiring an integer pointer 373 */ 374 static inline int cp210x_set_config_single(struct usb_serial_port *port, 375 u8 request, unsigned int data) 376 { 377 return cp210x_set_config(port, request, &data, 2); 378 } 379 380 /* 381 * cp210x_quantise_baudrate 382 * Quantises the baud rate as per AN205 Table 1 383 */ 384 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 385 if (baud <= 300) 386 baud = 300; 387 else if (baud <= 600) baud = 600; 388 else if (baud <= 1200) baud = 1200; 389 else if (baud <= 1800) baud = 1800; 390 else if (baud <= 2400) baud = 2400; 391 else if (baud <= 4000) baud = 4000; 392 else if (baud <= 4803) baud = 4800; 393 else if (baud <= 7207) baud = 7200; 394 else if (baud <= 9612) baud = 9600; 395 else if (baud <= 14428) baud = 14400; 396 else if (baud <= 16062) baud = 16000; 397 else if (baud <= 19250) baud = 19200; 398 else if (baud <= 28912) baud = 28800; 399 else if (baud <= 38601) baud = 38400; 400 else if (baud <= 51558) baud = 51200; 401 else if (baud <= 56280) baud = 56000; 402 else if (baud <= 58053) baud = 57600; 403 else if (baud <= 64111) baud = 64000; 404 else if (baud <= 77608) baud = 76800; 405 else if (baud <= 117028) baud = 115200; 406 else if (baud <= 129347) baud = 128000; 407 else if (baud <= 156868) baud = 153600; 408 else if (baud <= 237832) baud = 230400; 409 else if (baud <= 254234) baud = 250000; 410 else if (baud <= 273066) baud = 256000; 411 else if (baud <= 491520) baud = 460800; 412 else if (baud <= 567138) baud = 500000; 413 else if (baud <= 670254) baud = 576000; 414 else if (baud < 1000000) 415 baud = 921600; 416 else if (baud > 2000000) 417 baud = 2000000; 418 return baud; 419 } 420 421 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 422 { 423 int result; 424 425 dbg("%s - port %d", __func__, port->number); 426 427 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 428 UART_ENABLE); 429 if (result) { 430 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 431 return result; 432 } 433 434 /* Configure the termios structure */ 435 cp210x_get_termios(tty, port); 436 437 /* The baud rate must be initialised on cp2104 */ 438 if (tty) 439 cp210x_change_speed(tty, port, NULL); 440 441 return usb_serial_generic_open(tty, port); 442 } 443 444 static void cp210x_close(struct usb_serial_port *port) 445 { 446 dbg("%s - port %d", __func__, port->number); 447 448 usb_serial_generic_close(port); 449 450 mutex_lock(&port->serial->disc_mutex); 451 if (!port->serial->disconnected) 452 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 453 mutex_unlock(&port->serial->disc_mutex); 454 } 455 456 /* 457 * cp210x_get_termios 458 * Reads the baud rate, data bits, parity, stop bits and flow control mode 459 * from the device, corrects any unsupported values, and configures the 460 * termios structure to reflect the state of the device 461 */ 462 static void cp210x_get_termios(struct tty_struct *tty, 463 struct usb_serial_port *port) 464 { 465 unsigned int baud; 466 467 if (tty) { 468 cp210x_get_termios_port(tty->driver_data, 469 &tty->termios->c_cflag, &baud); 470 tty_encode_baud_rate(tty, baud, baud); 471 } 472 473 else { 474 unsigned int cflag; 475 cflag = 0; 476 cp210x_get_termios_port(port, &cflag, &baud); 477 } 478 } 479 480 /* 481 * cp210x_get_termios_port 482 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 483 */ 484 static void cp210x_get_termios_port(struct usb_serial_port *port, 485 unsigned int *cflagp, unsigned int *baudp) 486 { 487 unsigned int cflag, modem_ctl[4]; 488 unsigned int baud; 489 unsigned int bits; 490 491 dbg("%s - port %d", __func__, port->number); 492 493 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 494 495 dbg("%s - baud rate = %d", __func__, baud); 496 *baudp = baud; 497 498 cflag = *cflagp; 499 500 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 501 cflag &= ~CSIZE; 502 switch (bits & BITS_DATA_MASK) { 503 case BITS_DATA_5: 504 dbg("%s - data bits = 5", __func__); 505 cflag |= CS5; 506 break; 507 case BITS_DATA_6: 508 dbg("%s - data bits = 6", __func__); 509 cflag |= CS6; 510 break; 511 case BITS_DATA_7: 512 dbg("%s - data bits = 7", __func__); 513 cflag |= CS7; 514 break; 515 case BITS_DATA_8: 516 dbg("%s - data bits = 8", __func__); 517 cflag |= CS8; 518 break; 519 case BITS_DATA_9: 520 dbg("%s - data bits = 9 (not supported, using 8 data bits)", 521 __func__); 522 cflag |= CS8; 523 bits &= ~BITS_DATA_MASK; 524 bits |= BITS_DATA_8; 525 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 526 break; 527 default: 528 dbg("%s - Unknown number of data bits, using 8", __func__); 529 cflag |= CS8; 530 bits &= ~BITS_DATA_MASK; 531 bits |= BITS_DATA_8; 532 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 533 break; 534 } 535 536 switch (bits & BITS_PARITY_MASK) { 537 case BITS_PARITY_NONE: 538 dbg("%s - parity = NONE", __func__); 539 cflag &= ~PARENB; 540 break; 541 case BITS_PARITY_ODD: 542 dbg("%s - parity = ODD", __func__); 543 cflag |= (PARENB|PARODD); 544 break; 545 case BITS_PARITY_EVEN: 546 dbg("%s - parity = EVEN", __func__); 547 cflag &= ~PARODD; 548 cflag |= PARENB; 549 break; 550 case BITS_PARITY_MARK: 551 dbg("%s - parity = MARK", __func__); 552 cflag |= (PARENB|PARODD|CMSPAR); 553 break; 554 case BITS_PARITY_SPACE: 555 dbg("%s - parity = SPACE", __func__); 556 cflag &= ~PARODD; 557 cflag |= (PARENB|CMSPAR); 558 break; 559 default: 560 dbg("%s - Unknown parity mode, disabling parity", __func__); 561 cflag &= ~PARENB; 562 bits &= ~BITS_PARITY_MASK; 563 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 564 break; 565 } 566 567 cflag &= ~CSTOPB; 568 switch (bits & BITS_STOP_MASK) { 569 case BITS_STOP_1: 570 dbg("%s - stop bits = 1", __func__); 571 break; 572 case BITS_STOP_1_5: 573 dbg("%s - stop bits = 1.5 (not supported, 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 case BITS_STOP_2: 579 dbg("%s - stop bits = 2", __func__); 580 cflag |= CSTOPB; 581 break; 582 default: 583 dbg("%s - Unknown number of stop bits, using 1 stop bit", 584 __func__); 585 bits &= ~BITS_STOP_MASK; 586 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 587 break; 588 } 589 590 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 591 if (modem_ctl[0] & 0x0008) { 592 dbg("%s - flow control = CRTSCTS", __func__); 593 cflag |= CRTSCTS; 594 } else { 595 dbg("%s - flow control = NONE", __func__); 596 cflag &= ~CRTSCTS; 597 } 598 599 *cflagp = cflag; 600 } 601 602 /* 603 * CP2101 supports the following baud rates: 604 * 605 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 606 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 607 * 608 * CP2102 and CP2103 support the following additional rates: 609 * 610 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 611 * 576000 612 * 613 * The device will map a requested rate to a supported one, but the result 614 * of requests for rates greater than 1053257 is undefined (see AN205). 615 * 616 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 617 * respectively, with an error less than 1%. The actual rates are determined 618 * by 619 * 620 * div = round(freq / (2 x prescale x request)) 621 * actual = freq / (2 x prescale x div) 622 * 623 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 624 * or 1 otherwise. 625 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 626 * otherwise. 627 */ 628 static void cp210x_change_speed(struct tty_struct *tty, 629 struct usb_serial_port *port, struct ktermios *old_termios) 630 { 631 u32 baud; 632 633 baud = tty->termios->c_ospeed; 634 635 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 636 * or to an arbitrary rate in [1M,2M]. 637 * 638 * NOTE: B0 is not implemented. 639 */ 640 baud = cp210x_quantise_baudrate(baud); 641 642 dbg("%s - setting baud rate to %u", __func__, baud); 643 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 644 sizeof(baud))) { 645 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 646 if (old_termios) 647 baud = old_termios->c_ospeed; 648 else 649 baud = 9600; 650 } 651 652 tty_encode_baud_rate(tty, baud, baud); 653 } 654 655 static void cp210x_set_termios(struct tty_struct *tty, 656 struct usb_serial_port *port, struct ktermios *old_termios) 657 { 658 unsigned int cflag, old_cflag; 659 unsigned int bits; 660 unsigned int modem_ctl[4]; 661 662 dbg("%s - port %d", __func__, port->number); 663 664 if (!tty) 665 return; 666 667 cflag = tty->termios->c_cflag; 668 old_cflag = old_termios->c_cflag; 669 670 if (tty->termios->c_ospeed != old_termios->c_ospeed) 671 cp210x_change_speed(tty, port, old_termios); 672 673 /* If the number of data bits is to be updated */ 674 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 675 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 676 bits &= ~BITS_DATA_MASK; 677 switch (cflag & CSIZE) { 678 case CS5: 679 bits |= BITS_DATA_5; 680 dbg("%s - data bits = 5", __func__); 681 break; 682 case CS6: 683 bits |= BITS_DATA_6; 684 dbg("%s - data bits = 6", __func__); 685 break; 686 case CS7: 687 bits |= BITS_DATA_7; 688 dbg("%s - data bits = 7", __func__); 689 break; 690 case CS8: 691 bits |= BITS_DATA_8; 692 dbg("%s - data bits = 8", __func__); 693 break; 694 /*case CS9: 695 bits |= BITS_DATA_9; 696 dbg("%s - data bits = 9", __func__); 697 break;*/ 698 default: 699 dbg("cp210x driver does not " 700 "support the number of bits requested," 701 " using 8 bit mode"); 702 bits |= BITS_DATA_8; 703 break; 704 } 705 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 706 dbg("Number of data bits requested " 707 "not supported by device"); 708 } 709 710 if ((cflag & (PARENB|PARODD|CMSPAR)) != 711 (old_cflag & (PARENB|PARODD|CMSPAR))) { 712 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 713 bits &= ~BITS_PARITY_MASK; 714 if (cflag & PARENB) { 715 if (cflag & CMSPAR) { 716 if (cflag & PARODD) { 717 bits |= BITS_PARITY_MARK; 718 dbg("%s - parity = MARK", __func__); 719 } else { 720 bits |= BITS_PARITY_SPACE; 721 dbg("%s - parity = SPACE", __func__); 722 } 723 } else { 724 if (cflag & PARODD) { 725 bits |= BITS_PARITY_ODD; 726 dbg("%s - parity = ODD", __func__); 727 } else { 728 bits |= BITS_PARITY_EVEN; 729 dbg("%s - parity = EVEN", __func__); 730 } 731 } 732 } 733 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 734 dbg("Parity mode not supported by device"); 735 } 736 737 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 738 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 739 bits &= ~BITS_STOP_MASK; 740 if (cflag & CSTOPB) { 741 bits |= BITS_STOP_2; 742 dbg("%s - stop bits = 2", __func__); 743 } else { 744 bits |= BITS_STOP_1; 745 dbg("%s - stop bits = 1", __func__); 746 } 747 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 748 dbg("Number of stop bits requested " 749 "not supported by device"); 750 } 751 752 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 753 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 754 dbg("%s - read 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]); 757 758 if (cflag & CRTSCTS) { 759 modem_ctl[0] &= ~0x7B; 760 modem_ctl[0] |= 0x09; 761 modem_ctl[1] = 0x80; 762 dbg("%s - flow control = CRTSCTS", __func__); 763 } else { 764 modem_ctl[0] &= ~0x7B; 765 modem_ctl[0] |= 0x01; 766 modem_ctl[1] |= 0x40; 767 dbg("%s - flow control = NONE", __func__); 768 } 769 770 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x", 771 __func__, modem_ctl[0], modem_ctl[1], 772 modem_ctl[2], modem_ctl[3]); 773 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 774 } 775 776 } 777 778 static int cp210x_tiocmset (struct tty_struct *tty, 779 unsigned int set, unsigned int clear) 780 { 781 struct usb_serial_port *port = tty->driver_data; 782 return cp210x_tiocmset_port(port, set, clear); 783 } 784 785 static int cp210x_tiocmset_port(struct usb_serial_port *port, 786 unsigned int set, unsigned int clear) 787 { 788 unsigned int control = 0; 789 790 dbg("%s - port %d", __func__, port->number); 791 792 if (set & TIOCM_RTS) { 793 control |= CONTROL_RTS; 794 control |= CONTROL_WRITE_RTS; 795 } 796 if (set & TIOCM_DTR) { 797 control |= CONTROL_DTR; 798 control |= CONTROL_WRITE_DTR; 799 } 800 if (clear & TIOCM_RTS) { 801 control &= ~CONTROL_RTS; 802 control |= CONTROL_WRITE_RTS; 803 } 804 if (clear & TIOCM_DTR) { 805 control &= ~CONTROL_DTR; 806 control |= CONTROL_WRITE_DTR; 807 } 808 809 dbg("%s - control = 0x%.4x", __func__, control); 810 811 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 812 } 813 814 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 815 { 816 if (on) 817 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 818 else 819 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 820 } 821 822 static int cp210x_tiocmget (struct tty_struct *tty) 823 { 824 struct usb_serial_port *port = tty->driver_data; 825 unsigned int control; 826 int result; 827 828 dbg("%s - port %d", __func__, port->number); 829 830 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 831 832 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 833 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 834 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 835 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 836 |((control & CONTROL_RING)? TIOCM_RI : 0) 837 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 838 839 dbg("%s - control = 0x%.2x", __func__, control); 840 841 return result; 842 } 843 844 static void cp210x_break_ctl (struct tty_struct *tty, int break_state) 845 { 846 struct usb_serial_port *port = tty->driver_data; 847 unsigned int state; 848 849 dbg("%s - port %d", __func__, port->number); 850 if (break_state == 0) 851 state = BREAK_OFF; 852 else 853 state = BREAK_ON; 854 dbg("%s - turning break %s", __func__, 855 state == BREAK_OFF ? "off" : "on"); 856 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 857 } 858 859 static int cp210x_startup(struct usb_serial *serial) 860 { 861 struct cp210x_port_private *port_priv; 862 int i; 863 864 /* cp210x buffers behave strangely unless device is reset */ 865 usb_reset_device(serial->dev); 866 867 for (i = 0; i < serial->num_ports; i++) { 868 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 869 if (!port_priv) 870 return -ENOMEM; 871 872 memset(port_priv, 0x00, sizeof(*port_priv)); 873 port_priv->bInterfaceNumber = 874 serial->interface->cur_altsetting->desc.bInterfaceNumber; 875 876 usb_set_serial_port_data(serial->port[i], port_priv); 877 } 878 879 return 0; 880 } 881 882 static void cp210x_release(struct usb_serial *serial) 883 { 884 struct cp210x_port_private *port_priv; 885 int i; 886 887 for (i = 0; i < serial->num_ports; i++) { 888 port_priv = usb_get_serial_port_data(serial->port[i]); 889 kfree(port_priv); 890 usb_set_serial_port_data(serial->port[i], NULL); 891 } 892 } 893 894 module_usb_serial_driver(cp210x_driver, serial_drivers); 895 896 MODULE_DESCRIPTION(DRIVER_DESC); 897 MODULE_VERSION(DRIVER_VERSION); 898 MODULE_LICENSE("GPL"); 899 900 module_param(debug, bool, S_IRUGO | S_IWUSR); 901 MODULE_PARM_DESC(debug, "Enable verbose debugging messages"); 902