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, 0x815F) }, /* Timewave HamLinkUSB */ 97 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 98 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 99 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 100 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 101 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 102 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 103 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 104 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 105 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 106 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 107 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 108 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 109 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 110 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 111 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 112 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 113 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 114 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 115 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 116 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 117 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 118 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 119 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 120 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 121 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 122 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 123 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 124 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 125 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 126 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 127 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 128 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 129 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 130 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 131 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 132 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 133 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 134 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 135 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 136 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 137 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 138 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 139 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 140 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 141 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 142 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 143 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 144 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 145 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 146 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 147 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 148 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 149 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 150 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 151 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 152 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 153 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 154 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 155 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 156 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 157 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 158 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 159 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 160 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 161 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 162 { } /* Terminating Entry */ 163 }; 164 165 MODULE_DEVICE_TABLE(usb, id_table); 166 167 struct cp210x_port_private { 168 __u8 bInterfaceNumber; 169 }; 170 171 static struct usb_serial_driver cp210x_device = { 172 .driver = { 173 .owner = THIS_MODULE, 174 .name = "cp210x", 175 }, 176 .id_table = id_table, 177 .num_ports = 1, 178 .bulk_in_size = 256, 179 .bulk_out_size = 256, 180 .open = cp210x_open, 181 .close = cp210x_close, 182 .break_ctl = cp210x_break_ctl, 183 .set_termios = cp210x_set_termios, 184 .tiocmget = cp210x_tiocmget, 185 .tiocmset = cp210x_tiocmset, 186 .attach = cp210x_startup, 187 .release = cp210x_release, 188 .dtr_rts = cp210x_dtr_rts 189 }; 190 191 static struct usb_serial_driver * const serial_drivers[] = { 192 &cp210x_device, NULL 193 }; 194 195 /* Config request types */ 196 #define REQTYPE_HOST_TO_INTERFACE 0x41 197 #define REQTYPE_INTERFACE_TO_HOST 0xc1 198 #define REQTYPE_HOST_TO_DEVICE 0x40 199 #define REQTYPE_DEVICE_TO_HOST 0xc0 200 201 /* Config request codes */ 202 #define CP210X_IFC_ENABLE 0x00 203 #define CP210X_SET_BAUDDIV 0x01 204 #define CP210X_GET_BAUDDIV 0x02 205 #define CP210X_SET_LINE_CTL 0x03 206 #define CP210X_GET_LINE_CTL 0x04 207 #define CP210X_SET_BREAK 0x05 208 #define CP210X_IMM_CHAR 0x06 209 #define CP210X_SET_MHS 0x07 210 #define CP210X_GET_MDMSTS 0x08 211 #define CP210X_SET_XON 0x09 212 #define CP210X_SET_XOFF 0x0A 213 #define CP210X_SET_EVENTMASK 0x0B 214 #define CP210X_GET_EVENTMASK 0x0C 215 #define CP210X_SET_CHAR 0x0D 216 #define CP210X_GET_CHARS 0x0E 217 #define CP210X_GET_PROPS 0x0F 218 #define CP210X_GET_COMM_STATUS 0x10 219 #define CP210X_RESET 0x11 220 #define CP210X_PURGE 0x12 221 #define CP210X_SET_FLOW 0x13 222 #define CP210X_GET_FLOW 0x14 223 #define CP210X_EMBED_EVENTS 0x15 224 #define CP210X_GET_EVENTSTATE 0x16 225 #define CP210X_SET_CHARS 0x19 226 #define CP210X_GET_BAUDRATE 0x1D 227 #define CP210X_SET_BAUDRATE 0x1E 228 229 /* CP210X_IFC_ENABLE */ 230 #define UART_ENABLE 0x0001 231 #define UART_DISABLE 0x0000 232 233 /* CP210X_(SET|GET)_BAUDDIV */ 234 #define BAUD_RATE_GEN_FREQ 0x384000 235 236 /* CP210X_(SET|GET)_LINE_CTL */ 237 #define BITS_DATA_MASK 0X0f00 238 #define BITS_DATA_5 0X0500 239 #define BITS_DATA_6 0X0600 240 #define BITS_DATA_7 0X0700 241 #define BITS_DATA_8 0X0800 242 #define BITS_DATA_9 0X0900 243 244 #define BITS_PARITY_MASK 0x00f0 245 #define BITS_PARITY_NONE 0x0000 246 #define BITS_PARITY_ODD 0x0010 247 #define BITS_PARITY_EVEN 0x0020 248 #define BITS_PARITY_MARK 0x0030 249 #define BITS_PARITY_SPACE 0x0040 250 251 #define BITS_STOP_MASK 0x000f 252 #define BITS_STOP_1 0x0000 253 #define BITS_STOP_1_5 0x0001 254 #define BITS_STOP_2 0x0002 255 256 /* CP210X_SET_BREAK */ 257 #define BREAK_ON 0x0001 258 #define BREAK_OFF 0x0000 259 260 /* CP210X_(SET_MHS|GET_MDMSTS) */ 261 #define CONTROL_DTR 0x0001 262 #define CONTROL_RTS 0x0002 263 #define CONTROL_CTS 0x0010 264 #define CONTROL_DSR 0x0020 265 #define CONTROL_RING 0x0040 266 #define CONTROL_DCD 0x0080 267 #define CONTROL_WRITE_DTR 0x0100 268 #define CONTROL_WRITE_RTS 0x0200 269 270 /* 271 * cp210x_get_config 272 * Reads from the CP210x configuration registers 273 * 'size' is specified in bytes. 274 * 'data' is a pointer to a pre-allocated array of integers large 275 * enough to hold 'size' bytes (with 4 bytes to each integer) 276 */ 277 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 278 unsigned int *data, int size) 279 { 280 struct usb_serial *serial = port->serial; 281 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 282 __le32 *buf; 283 int result, i, length; 284 285 /* Number of integers required to contain the array */ 286 length = (((size - 1) | 3) + 1)/4; 287 288 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 289 if (!buf) { 290 dev_err(&port->dev, "%s - out of memory.\n", __func__); 291 return -ENOMEM; 292 } 293 294 /* Issue the request, attempting to read 'size' bytes */ 295 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 296 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 297 port_priv->bInterfaceNumber, buf, size, 298 USB_CTRL_GET_TIMEOUT); 299 300 /* Convert data into an array of integers */ 301 for (i = 0; i < length; i++) 302 data[i] = le32_to_cpu(buf[i]); 303 304 kfree(buf); 305 306 if (result != size) { 307 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 308 __func__, request, size, result); 309 if (result > 0) 310 result = -EPROTO; 311 312 return result; 313 } 314 315 return 0; 316 } 317 318 /* 319 * cp210x_set_config 320 * Writes to the CP210x configuration registers 321 * Values less than 16 bits wide are sent directly 322 * 'size' is specified in bytes. 323 */ 324 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 325 unsigned int *data, int size) 326 { 327 struct usb_serial *serial = port->serial; 328 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 329 __le32 *buf; 330 int result, i, length; 331 332 /* Number of integers required to contain the array */ 333 length = (((size - 1) | 3) + 1)/4; 334 335 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 336 if (!buf) { 337 dev_err(&port->dev, "%s - out of memory.\n", 338 __func__); 339 return -ENOMEM; 340 } 341 342 /* Array of integers into bytes */ 343 for (i = 0; i < length; i++) 344 buf[i] = cpu_to_le32(data[i]); 345 346 if (size > 2) { 347 result = usb_control_msg(serial->dev, 348 usb_sndctrlpipe(serial->dev, 0), 349 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 350 port_priv->bInterfaceNumber, buf, size, 351 USB_CTRL_SET_TIMEOUT); 352 } else { 353 result = usb_control_msg(serial->dev, 354 usb_sndctrlpipe(serial->dev, 0), 355 request, REQTYPE_HOST_TO_INTERFACE, data[0], 356 port_priv->bInterfaceNumber, NULL, 0, 357 USB_CTRL_SET_TIMEOUT); 358 } 359 360 kfree(buf); 361 362 if ((size > 2 && result != size) || result < 0) { 363 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 364 __func__, request, size, result); 365 if (result > 0) 366 result = -EPROTO; 367 368 return result; 369 } 370 371 return 0; 372 } 373 374 /* 375 * cp210x_set_config_single 376 * Convenience function for calling cp210x_set_config on single data values 377 * without requiring an integer pointer 378 */ 379 static inline int cp210x_set_config_single(struct usb_serial_port *port, 380 u8 request, unsigned int data) 381 { 382 return cp210x_set_config(port, request, &data, 2); 383 } 384 385 /* 386 * cp210x_quantise_baudrate 387 * Quantises the baud rate as per AN205 Table 1 388 */ 389 static unsigned int cp210x_quantise_baudrate(unsigned int baud) { 390 if (baud <= 300) 391 baud = 300; 392 else if (baud <= 600) baud = 600; 393 else if (baud <= 1200) baud = 1200; 394 else if (baud <= 1800) baud = 1800; 395 else if (baud <= 2400) baud = 2400; 396 else if (baud <= 4000) baud = 4000; 397 else if (baud <= 4803) baud = 4800; 398 else if (baud <= 7207) baud = 7200; 399 else if (baud <= 9612) baud = 9600; 400 else if (baud <= 14428) baud = 14400; 401 else if (baud <= 16062) baud = 16000; 402 else if (baud <= 19250) baud = 19200; 403 else if (baud <= 28912) baud = 28800; 404 else if (baud <= 38601) baud = 38400; 405 else if (baud <= 51558) baud = 51200; 406 else if (baud <= 56280) baud = 56000; 407 else if (baud <= 58053) baud = 57600; 408 else if (baud <= 64111) baud = 64000; 409 else if (baud <= 77608) baud = 76800; 410 else if (baud <= 117028) baud = 115200; 411 else if (baud <= 129347) baud = 128000; 412 else if (baud <= 156868) baud = 153600; 413 else if (baud <= 237832) baud = 230400; 414 else if (baud <= 254234) baud = 250000; 415 else if (baud <= 273066) baud = 256000; 416 else if (baud <= 491520) baud = 460800; 417 else if (baud <= 567138) baud = 500000; 418 else if (baud <= 670254) baud = 576000; 419 else if (baud < 1000000) 420 baud = 921600; 421 else if (baud > 2000000) 422 baud = 2000000; 423 return baud; 424 } 425 426 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 427 { 428 int result; 429 430 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 431 UART_ENABLE); 432 if (result) { 433 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 434 return result; 435 } 436 437 /* Configure the termios structure */ 438 cp210x_get_termios(tty, port); 439 440 /* The baud rate must be initialised on cp2104 */ 441 if (tty) 442 cp210x_change_speed(tty, port, NULL); 443 444 return usb_serial_generic_open(tty, port); 445 } 446 447 static void cp210x_close(struct usb_serial_port *port) 448 { 449 usb_serial_generic_close(port); 450 451 mutex_lock(&port->serial->disc_mutex); 452 if (!port->serial->disconnected) 453 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 454 mutex_unlock(&port->serial->disc_mutex); 455 } 456 457 /* 458 * cp210x_get_termios 459 * Reads the baud rate, data bits, parity, stop bits and flow control mode 460 * from the device, corrects any unsupported values, and configures the 461 * termios structure to reflect the state of the device 462 */ 463 static void cp210x_get_termios(struct tty_struct *tty, 464 struct usb_serial_port *port) 465 { 466 unsigned int baud; 467 468 if (tty) { 469 cp210x_get_termios_port(tty->driver_data, 470 &tty->termios->c_cflag, &baud); 471 tty_encode_baud_rate(tty, baud, baud); 472 } 473 474 else { 475 unsigned int cflag; 476 cflag = 0; 477 cp210x_get_termios_port(port, &cflag, &baud); 478 } 479 } 480 481 /* 482 * cp210x_get_termios_port 483 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 484 */ 485 static void cp210x_get_termios_port(struct usb_serial_port *port, 486 unsigned int *cflagp, unsigned int *baudp) 487 { 488 struct device *dev = &port->dev; 489 unsigned int cflag, modem_ctl[4]; 490 unsigned int baud; 491 unsigned int bits; 492 493 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 494 495 dev_dbg(dev, "%s - baud rate = %d\n", __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 dev_dbg(dev, "%s - data bits = 5\n", __func__); 505 cflag |= CS5; 506 break; 507 case BITS_DATA_6: 508 dev_dbg(dev, "%s - data bits = 6\n", __func__); 509 cflag |= CS6; 510 break; 511 case BITS_DATA_7: 512 dev_dbg(dev, "%s - data bits = 7\n", __func__); 513 cflag |= CS7; 514 break; 515 case BITS_DATA_8: 516 dev_dbg(dev, "%s - data bits = 8\n", __func__); 517 cflag |= CS8; 518 break; 519 case BITS_DATA_9: 520 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 521 cflag |= CS8; 522 bits &= ~BITS_DATA_MASK; 523 bits |= BITS_DATA_8; 524 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 525 break; 526 default: 527 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 528 cflag |= CS8; 529 bits &= ~BITS_DATA_MASK; 530 bits |= BITS_DATA_8; 531 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 532 break; 533 } 534 535 switch (bits & BITS_PARITY_MASK) { 536 case BITS_PARITY_NONE: 537 dev_dbg(dev, "%s - parity = NONE\n", __func__); 538 cflag &= ~PARENB; 539 break; 540 case BITS_PARITY_ODD: 541 dev_dbg(dev, "%s - parity = ODD\n", __func__); 542 cflag |= (PARENB|PARODD); 543 break; 544 case BITS_PARITY_EVEN: 545 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 546 cflag &= ~PARODD; 547 cflag |= PARENB; 548 break; 549 case BITS_PARITY_MARK: 550 dev_dbg(dev, "%s - parity = MARK\n", __func__); 551 cflag |= (PARENB|PARODD|CMSPAR); 552 break; 553 case BITS_PARITY_SPACE: 554 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 555 cflag &= ~PARODD; 556 cflag |= (PARENB|CMSPAR); 557 break; 558 default: 559 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 560 cflag &= ~PARENB; 561 bits &= ~BITS_PARITY_MASK; 562 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 563 break; 564 } 565 566 cflag &= ~CSTOPB; 567 switch (bits & BITS_STOP_MASK) { 568 case BITS_STOP_1: 569 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 570 break; 571 case BITS_STOP_1_5: 572 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 573 bits &= ~BITS_STOP_MASK; 574 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 575 break; 576 case BITS_STOP_2: 577 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 578 cflag |= CSTOPB; 579 break; 580 default: 581 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 582 bits &= ~BITS_STOP_MASK; 583 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 584 break; 585 } 586 587 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 588 if (modem_ctl[0] & 0x0008) { 589 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 590 cflag |= CRTSCTS; 591 } else { 592 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 593 cflag &= ~CRTSCTS; 594 } 595 596 *cflagp = cflag; 597 } 598 599 /* 600 * CP2101 supports the following baud rates: 601 * 602 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 603 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 604 * 605 * CP2102 and CP2103 support the following additional rates: 606 * 607 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 608 * 576000 609 * 610 * The device will map a requested rate to a supported one, but the result 611 * of requests for rates greater than 1053257 is undefined (see AN205). 612 * 613 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 614 * respectively, with an error less than 1%. The actual rates are determined 615 * by 616 * 617 * div = round(freq / (2 x prescale x request)) 618 * actual = freq / (2 x prescale x div) 619 * 620 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 621 * or 1 otherwise. 622 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 623 * otherwise. 624 */ 625 static void cp210x_change_speed(struct tty_struct *tty, 626 struct usb_serial_port *port, struct ktermios *old_termios) 627 { 628 u32 baud; 629 630 baud = tty->termios->c_ospeed; 631 632 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 633 * or to an arbitrary rate in [1M,2M]. 634 * 635 * NOTE: B0 is not implemented. 636 */ 637 baud = cp210x_quantise_baudrate(baud); 638 639 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 640 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 641 sizeof(baud))) { 642 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 643 if (old_termios) 644 baud = old_termios->c_ospeed; 645 else 646 baud = 9600; 647 } 648 649 tty_encode_baud_rate(tty, baud, baud); 650 } 651 652 static void cp210x_set_termios(struct tty_struct *tty, 653 struct usb_serial_port *port, struct ktermios *old_termios) 654 { 655 struct device *dev = &port->dev; 656 unsigned int cflag, old_cflag; 657 unsigned int bits; 658 unsigned int modem_ctl[4]; 659 660 dev_dbg(dev, "%s - port %d\n", __func__, port->number); 661 662 if (!tty) 663 return; 664 665 cflag = tty->termios->c_cflag; 666 old_cflag = old_termios->c_cflag; 667 668 if (tty->termios->c_ospeed != old_termios->c_ospeed) 669 cp210x_change_speed(tty, port, old_termios); 670 671 /* If the number of data bits is to be updated */ 672 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 673 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 674 bits &= ~BITS_DATA_MASK; 675 switch (cflag & CSIZE) { 676 case CS5: 677 bits |= BITS_DATA_5; 678 dev_dbg(dev, "%s - data bits = 5\n", __func__); 679 break; 680 case CS6: 681 bits |= BITS_DATA_6; 682 dev_dbg(dev, "%s - data bits = 6\n", __func__); 683 break; 684 case CS7: 685 bits |= BITS_DATA_7; 686 dev_dbg(dev, "%s - data bits = 7\n", __func__); 687 break; 688 case CS8: 689 bits |= BITS_DATA_8; 690 dev_dbg(dev, "%s - data bits = 8\n", __func__); 691 break; 692 /*case CS9: 693 bits |= BITS_DATA_9; 694 dev_dbg(dev, "%s - data bits = 9\n", __func__); 695 break;*/ 696 default: 697 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 698 bits |= BITS_DATA_8; 699 break; 700 } 701 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 702 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 703 } 704 705 if ((cflag & (PARENB|PARODD|CMSPAR)) != 706 (old_cflag & (PARENB|PARODD|CMSPAR))) { 707 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 708 bits &= ~BITS_PARITY_MASK; 709 if (cflag & PARENB) { 710 if (cflag & CMSPAR) { 711 if (cflag & PARODD) { 712 bits |= BITS_PARITY_MARK; 713 dev_dbg(dev, "%s - parity = MARK\n", __func__); 714 } else { 715 bits |= BITS_PARITY_SPACE; 716 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 717 } 718 } else { 719 if (cflag & PARODD) { 720 bits |= BITS_PARITY_ODD; 721 dev_dbg(dev, "%s - parity = ODD\n", __func__); 722 } else { 723 bits |= BITS_PARITY_EVEN; 724 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 725 } 726 } 727 } 728 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 729 dev_dbg(dev, "Parity mode not supported by device\n"); 730 } 731 732 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 733 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 734 bits &= ~BITS_STOP_MASK; 735 if (cflag & CSTOPB) { 736 bits |= BITS_STOP_2; 737 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 738 } else { 739 bits |= BITS_STOP_1; 740 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 741 } 742 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 743 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 744 } 745 746 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 747 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 748 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 749 __func__, modem_ctl[0], modem_ctl[1], 750 modem_ctl[2], modem_ctl[3]); 751 752 if (cflag & CRTSCTS) { 753 modem_ctl[0] &= ~0x7B; 754 modem_ctl[0] |= 0x09; 755 modem_ctl[1] = 0x80; 756 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 757 } else { 758 modem_ctl[0] &= ~0x7B; 759 modem_ctl[0] |= 0x01; 760 modem_ctl[1] |= 0x40; 761 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 762 } 763 764 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 765 __func__, modem_ctl[0], modem_ctl[1], 766 modem_ctl[2], modem_ctl[3]); 767 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 768 } 769 770 } 771 772 static int cp210x_tiocmset (struct tty_struct *tty, 773 unsigned int set, unsigned int clear) 774 { 775 struct usb_serial_port *port = tty->driver_data; 776 return cp210x_tiocmset_port(port, set, clear); 777 } 778 779 static int cp210x_tiocmset_port(struct usb_serial_port *port, 780 unsigned int set, unsigned int clear) 781 { 782 unsigned int control = 0; 783 784 if (set & TIOCM_RTS) { 785 control |= CONTROL_RTS; 786 control |= CONTROL_WRITE_RTS; 787 } 788 if (set & TIOCM_DTR) { 789 control |= CONTROL_DTR; 790 control |= CONTROL_WRITE_DTR; 791 } 792 if (clear & TIOCM_RTS) { 793 control &= ~CONTROL_RTS; 794 control |= CONTROL_WRITE_RTS; 795 } 796 if (clear & TIOCM_DTR) { 797 control &= ~CONTROL_DTR; 798 control |= CONTROL_WRITE_DTR; 799 } 800 801 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 802 803 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 804 } 805 806 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 807 { 808 if (on) 809 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 810 else 811 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 812 } 813 814 static int cp210x_tiocmget (struct tty_struct *tty) 815 { 816 struct usb_serial_port *port = tty->driver_data; 817 unsigned int control; 818 int result; 819 820 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 821 822 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 823 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 824 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 825 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 826 |((control & CONTROL_RING)? TIOCM_RI : 0) 827 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 828 829 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 830 831 return result; 832 } 833 834 static void cp210x_break_ctl (struct tty_struct *tty, int break_state) 835 { 836 struct usb_serial_port *port = tty->driver_data; 837 unsigned int state; 838 839 if (break_state == 0) 840 state = BREAK_OFF; 841 else 842 state = BREAK_ON; 843 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 844 state == BREAK_OFF ? "off" : "on"); 845 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 846 } 847 848 static int cp210x_startup(struct usb_serial *serial) 849 { 850 struct cp210x_port_private *port_priv; 851 int i; 852 853 /* cp210x buffers behave strangely unless device is reset */ 854 usb_reset_device(serial->dev); 855 856 for (i = 0; i < serial->num_ports; i++) { 857 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 858 if (!port_priv) 859 return -ENOMEM; 860 861 port_priv->bInterfaceNumber = 862 serial->interface->cur_altsetting->desc.bInterfaceNumber; 863 864 usb_set_serial_port_data(serial->port[i], port_priv); 865 } 866 867 return 0; 868 } 869 870 static void cp210x_release(struct usb_serial *serial) 871 { 872 struct cp210x_port_private *port_priv; 873 int i; 874 875 for (i = 0; i < serial->num_ports; i++) { 876 port_priv = usb_get_serial_port_data(serial->port[i]); 877 kfree(port_priv); 878 usb_set_serial_port_data(serial->port[i], NULL); 879 } 880 } 881 882 module_usb_serial_driver(serial_drivers, id_table); 883 884 MODULE_DESCRIPTION(DRIVER_DESC); 885 MODULE_VERSION(DRIVER_VERSION); 886 MODULE_LICENSE("GPL"); 887 888 module_param(debug, bool, S_IRUGO | S_IWUSR); 889 MODULE_PARM_DESC(debug, "Enable verbose debugging messages"); 890