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 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 28 29 /* 30 * Function Prototypes 31 */ 32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 33 static void cp210x_close(struct usb_serial_port *); 34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); 35 static void cp210x_get_termios_port(struct usb_serial_port *port, 36 unsigned int *cflagp, unsigned int *baudp); 37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 38 struct ktermios *); 39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 40 struct ktermios*); 41 static int cp210x_tiocmget(struct tty_struct *); 42 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 43 static int cp210x_tiocmset_port(struct usb_serial_port *port, 44 unsigned int, unsigned int); 45 static void cp210x_break_ctl(struct tty_struct *, int); 46 static int cp210x_startup(struct usb_serial *); 47 static void cp210x_release(struct usb_serial *); 48 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 49 50 static const struct usb_device_id id_table[] = { 51 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 52 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 53 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 54 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 55 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 56 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 57 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 58 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 59 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 60 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 61 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 62 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 63 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 64 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 65 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 66 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 67 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 68 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 69 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 70 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 71 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 72 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 73 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 74 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 75 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 76 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 77 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 78 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 79 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 80 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 81 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 82 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 83 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 84 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 85 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 86 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 87 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 88 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 89 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 90 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 91 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 92 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 93 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 94 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 95 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 96 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 97 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 98 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 99 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 100 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 101 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 102 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 103 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 104 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 105 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 106 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 107 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 108 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 109 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 110 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 111 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 112 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 113 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 114 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 115 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 116 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 117 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 118 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 119 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 120 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 121 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 122 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 123 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 124 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 125 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 126 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 127 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 128 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 129 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 130 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 131 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 132 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 133 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 134 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 135 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 136 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 137 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 138 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 139 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 140 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 141 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 142 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 143 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 144 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 145 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 146 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 147 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 148 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 149 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 150 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 151 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 152 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 153 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 154 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 155 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 156 { } /* Terminating Entry */ 157 }; 158 159 MODULE_DEVICE_TABLE(usb, id_table); 160 161 struct cp210x_serial_private { 162 __u8 bInterfaceNumber; 163 }; 164 165 static struct usb_serial_driver cp210x_device = { 166 .driver = { 167 .owner = THIS_MODULE, 168 .name = "cp210x", 169 }, 170 .id_table = id_table, 171 .num_ports = 1, 172 .bulk_in_size = 256, 173 .bulk_out_size = 256, 174 .open = cp210x_open, 175 .close = cp210x_close, 176 .break_ctl = cp210x_break_ctl, 177 .set_termios = cp210x_set_termios, 178 .tiocmget = cp210x_tiocmget, 179 .tiocmset = cp210x_tiocmset, 180 .attach = cp210x_startup, 181 .release = cp210x_release, 182 .dtr_rts = cp210x_dtr_rts 183 }; 184 185 static struct usb_serial_driver * const serial_drivers[] = { 186 &cp210x_device, NULL 187 }; 188 189 /* Config request types */ 190 #define REQTYPE_HOST_TO_INTERFACE 0x41 191 #define REQTYPE_INTERFACE_TO_HOST 0xc1 192 #define REQTYPE_HOST_TO_DEVICE 0x40 193 #define REQTYPE_DEVICE_TO_HOST 0xc0 194 195 /* Config request codes */ 196 #define CP210X_IFC_ENABLE 0x00 197 #define CP210X_SET_BAUDDIV 0x01 198 #define CP210X_GET_BAUDDIV 0x02 199 #define CP210X_SET_LINE_CTL 0x03 200 #define CP210X_GET_LINE_CTL 0x04 201 #define CP210X_SET_BREAK 0x05 202 #define CP210X_IMM_CHAR 0x06 203 #define CP210X_SET_MHS 0x07 204 #define CP210X_GET_MDMSTS 0x08 205 #define CP210X_SET_XON 0x09 206 #define CP210X_SET_XOFF 0x0A 207 #define CP210X_SET_EVENTMASK 0x0B 208 #define CP210X_GET_EVENTMASK 0x0C 209 #define CP210X_SET_CHAR 0x0D 210 #define CP210X_GET_CHARS 0x0E 211 #define CP210X_GET_PROPS 0x0F 212 #define CP210X_GET_COMM_STATUS 0x10 213 #define CP210X_RESET 0x11 214 #define CP210X_PURGE 0x12 215 #define CP210X_SET_FLOW 0x13 216 #define CP210X_GET_FLOW 0x14 217 #define CP210X_EMBED_EVENTS 0x15 218 #define CP210X_GET_EVENTSTATE 0x16 219 #define CP210X_SET_CHARS 0x19 220 #define CP210X_GET_BAUDRATE 0x1D 221 #define CP210X_SET_BAUDRATE 0x1E 222 223 /* CP210X_IFC_ENABLE */ 224 #define UART_ENABLE 0x0001 225 #define UART_DISABLE 0x0000 226 227 /* CP210X_(SET|GET)_BAUDDIV */ 228 #define BAUD_RATE_GEN_FREQ 0x384000 229 230 /* CP210X_(SET|GET)_LINE_CTL */ 231 #define BITS_DATA_MASK 0X0f00 232 #define BITS_DATA_5 0X0500 233 #define BITS_DATA_6 0X0600 234 #define BITS_DATA_7 0X0700 235 #define BITS_DATA_8 0X0800 236 #define BITS_DATA_9 0X0900 237 238 #define BITS_PARITY_MASK 0x00f0 239 #define BITS_PARITY_NONE 0x0000 240 #define BITS_PARITY_ODD 0x0010 241 #define BITS_PARITY_EVEN 0x0020 242 #define BITS_PARITY_MARK 0x0030 243 #define BITS_PARITY_SPACE 0x0040 244 245 #define BITS_STOP_MASK 0x000f 246 #define BITS_STOP_1 0x0000 247 #define BITS_STOP_1_5 0x0001 248 #define BITS_STOP_2 0x0002 249 250 /* CP210X_SET_BREAK */ 251 #define BREAK_ON 0x0001 252 #define BREAK_OFF 0x0000 253 254 /* CP210X_(SET_MHS|GET_MDMSTS) */ 255 #define CONTROL_DTR 0x0001 256 #define CONTROL_RTS 0x0002 257 #define CONTROL_CTS 0x0010 258 #define CONTROL_DSR 0x0020 259 #define CONTROL_RING 0x0040 260 #define CONTROL_DCD 0x0080 261 #define CONTROL_WRITE_DTR 0x0100 262 #define CONTROL_WRITE_RTS 0x0200 263 264 /* 265 * cp210x_get_config 266 * Reads from the CP210x configuration registers 267 * 'size' is specified in bytes. 268 * 'data' is a pointer to a pre-allocated array of integers large 269 * enough to hold 'size' bytes (with 4 bytes to each integer) 270 */ 271 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 272 unsigned int *data, int size) 273 { 274 struct usb_serial *serial = port->serial; 275 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 276 __le32 *buf; 277 int result, i, length; 278 279 /* Number of integers required to contain the array */ 280 length = (((size - 1) | 3) + 1) / 4; 281 282 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 283 if (!buf) { 284 dev_err(&port->dev, "%s - out of memory.\n", __func__); 285 return -ENOMEM; 286 } 287 288 /* Issue the request, attempting to read 'size' bytes */ 289 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 290 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 291 spriv->bInterfaceNumber, buf, size, 292 USB_CTRL_GET_TIMEOUT); 293 294 /* Convert data into an array of integers */ 295 for (i = 0; i < length; i++) 296 data[i] = le32_to_cpu(buf[i]); 297 298 kfree(buf); 299 300 if (result != size) { 301 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 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_serial_private *spriv = usb_get_serial_data(serial); 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", __func__); 332 return -ENOMEM; 333 } 334 335 /* Array of integers into bytes */ 336 for (i = 0; i < length; i++) 337 buf[i] = cpu_to_le32(data[i]); 338 339 if (size > 2) { 340 result = usb_control_msg(serial->dev, 341 usb_sndctrlpipe(serial->dev, 0), 342 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 343 spriv->bInterfaceNumber, buf, size, 344 USB_CTRL_SET_TIMEOUT); 345 } else { 346 result = usb_control_msg(serial->dev, 347 usb_sndctrlpipe(serial->dev, 0), 348 request, REQTYPE_HOST_TO_INTERFACE, data[0], 349 spriv->bInterfaceNumber, NULL, 0, 350 USB_CTRL_SET_TIMEOUT); 351 } 352 353 kfree(buf); 354 355 if ((size > 2 && result != size) || result < 0) { 356 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 357 __func__, request, size, result); 358 if (result > 0) 359 result = -EPROTO; 360 361 return result; 362 } 363 364 return 0; 365 } 366 367 /* 368 * cp210x_set_config_single 369 * Convenience function for calling cp210x_set_config on single data values 370 * without requiring an integer pointer 371 */ 372 static inline int cp210x_set_config_single(struct usb_serial_port *port, 373 u8 request, unsigned int data) 374 { 375 return cp210x_set_config(port, request, &data, 2); 376 } 377 378 /* 379 * cp210x_quantise_baudrate 380 * Quantises the baud rate as per AN205 Table 1 381 */ 382 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 383 { 384 if (baud <= 300) 385 baud = 300; 386 else if (baud <= 600) baud = 600; 387 else if (baud <= 1200) baud = 1200; 388 else if (baud <= 1800) baud = 1800; 389 else if (baud <= 2400) baud = 2400; 390 else if (baud <= 4000) baud = 4000; 391 else if (baud <= 4803) baud = 4800; 392 else if (baud <= 7207) baud = 7200; 393 else if (baud <= 9612) baud = 9600; 394 else if (baud <= 14428) baud = 14400; 395 else if (baud <= 16062) baud = 16000; 396 else if (baud <= 19250) baud = 19200; 397 else if (baud <= 28912) baud = 28800; 398 else if (baud <= 38601) baud = 38400; 399 else if (baud <= 51558) baud = 51200; 400 else if (baud <= 56280) baud = 56000; 401 else if (baud <= 58053) baud = 57600; 402 else if (baud <= 64111) baud = 64000; 403 else if (baud <= 77608) baud = 76800; 404 else if (baud <= 117028) baud = 115200; 405 else if (baud <= 129347) baud = 128000; 406 else if (baud <= 156868) baud = 153600; 407 else if (baud <= 237832) baud = 230400; 408 else if (baud <= 254234) baud = 250000; 409 else if (baud <= 273066) baud = 256000; 410 else if (baud <= 491520) baud = 460800; 411 else if (baud <= 567138) baud = 500000; 412 else if (baud <= 670254) baud = 576000; 413 else if (baud < 1000000) 414 baud = 921600; 415 else if (baud > 2000000) 416 baud = 2000000; 417 return baud; 418 } 419 420 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 421 { 422 int result; 423 424 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 425 UART_ENABLE); 426 if (result) { 427 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 428 return result; 429 } 430 431 /* Configure the termios structure */ 432 cp210x_get_termios(tty, port); 433 434 /* The baud rate must be initialised on cp2104 */ 435 if (tty) 436 cp210x_change_speed(tty, port, NULL); 437 438 return usb_serial_generic_open(tty, port); 439 } 440 441 static void cp210x_close(struct usb_serial_port *port) 442 { 443 usb_serial_generic_close(port); 444 445 mutex_lock(&port->serial->disc_mutex); 446 if (!port->serial->disconnected) 447 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 448 mutex_unlock(&port->serial->disc_mutex); 449 } 450 451 /* 452 * cp210x_get_termios 453 * Reads the baud rate, data bits, parity, stop bits and flow control mode 454 * from the device, corrects any unsupported values, and configures the 455 * termios structure to reflect the state of the device 456 */ 457 static void cp210x_get_termios(struct tty_struct *tty, 458 struct usb_serial_port *port) 459 { 460 unsigned int baud; 461 462 if (tty) { 463 cp210x_get_termios_port(tty->driver_data, 464 &tty->termios.c_cflag, &baud); 465 tty_encode_baud_rate(tty, baud, baud); 466 } else { 467 unsigned int cflag; 468 cflag = 0; 469 cp210x_get_termios_port(port, &cflag, &baud); 470 } 471 } 472 473 /* 474 * cp210x_get_termios_port 475 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 476 */ 477 static void cp210x_get_termios_port(struct usb_serial_port *port, 478 unsigned int *cflagp, unsigned int *baudp) 479 { 480 struct device *dev = &port->dev; 481 unsigned int cflag, modem_ctl[4]; 482 unsigned int baud; 483 unsigned int bits; 484 485 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 486 487 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 488 *baudp = baud; 489 490 cflag = *cflagp; 491 492 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 493 cflag &= ~CSIZE; 494 switch (bits & BITS_DATA_MASK) { 495 case BITS_DATA_5: 496 dev_dbg(dev, "%s - data bits = 5\n", __func__); 497 cflag |= CS5; 498 break; 499 case BITS_DATA_6: 500 dev_dbg(dev, "%s - data bits = 6\n", __func__); 501 cflag |= CS6; 502 break; 503 case BITS_DATA_7: 504 dev_dbg(dev, "%s - data bits = 7\n", __func__); 505 cflag |= CS7; 506 break; 507 case BITS_DATA_8: 508 dev_dbg(dev, "%s - data bits = 8\n", __func__); 509 cflag |= CS8; 510 break; 511 case BITS_DATA_9: 512 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 513 cflag |= CS8; 514 bits &= ~BITS_DATA_MASK; 515 bits |= BITS_DATA_8; 516 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 517 break; 518 default: 519 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 520 cflag |= CS8; 521 bits &= ~BITS_DATA_MASK; 522 bits |= BITS_DATA_8; 523 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 524 break; 525 } 526 527 switch (bits & BITS_PARITY_MASK) { 528 case BITS_PARITY_NONE: 529 dev_dbg(dev, "%s - parity = NONE\n", __func__); 530 cflag &= ~PARENB; 531 break; 532 case BITS_PARITY_ODD: 533 dev_dbg(dev, "%s - parity = ODD\n", __func__); 534 cflag |= (PARENB|PARODD); 535 break; 536 case BITS_PARITY_EVEN: 537 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 538 cflag &= ~PARODD; 539 cflag |= PARENB; 540 break; 541 case BITS_PARITY_MARK: 542 dev_dbg(dev, "%s - parity = MARK\n", __func__); 543 cflag |= (PARENB|PARODD|CMSPAR); 544 break; 545 case BITS_PARITY_SPACE: 546 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 547 cflag &= ~PARODD; 548 cflag |= (PARENB|CMSPAR); 549 break; 550 default: 551 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 552 cflag &= ~PARENB; 553 bits &= ~BITS_PARITY_MASK; 554 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 555 break; 556 } 557 558 cflag &= ~CSTOPB; 559 switch (bits & BITS_STOP_MASK) { 560 case BITS_STOP_1: 561 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 562 break; 563 case BITS_STOP_1_5: 564 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __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 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 570 cflag |= CSTOPB; 571 break; 572 default: 573 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 574 bits &= ~BITS_STOP_MASK; 575 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 576 break; 577 } 578 579 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 580 if (modem_ctl[0] & 0x0008) { 581 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 582 cflag |= CRTSCTS; 583 } else { 584 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 585 cflag &= ~CRTSCTS; 586 } 587 588 *cflagp = cflag; 589 } 590 591 /* 592 * CP2101 supports the following baud rates: 593 * 594 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 595 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 596 * 597 * CP2102 and CP2103 support the following additional rates: 598 * 599 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 600 * 576000 601 * 602 * The device will map a requested rate to a supported one, but the result 603 * of requests for rates greater than 1053257 is undefined (see AN205). 604 * 605 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 606 * respectively, with an error less than 1%. The actual rates are determined 607 * by 608 * 609 * div = round(freq / (2 x prescale x request)) 610 * actual = freq / (2 x prescale x div) 611 * 612 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 613 * or 1 otherwise. 614 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 615 * otherwise. 616 */ 617 static void cp210x_change_speed(struct tty_struct *tty, 618 struct usb_serial_port *port, struct ktermios *old_termios) 619 { 620 u32 baud; 621 622 baud = tty->termios.c_ospeed; 623 624 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 625 * or to an arbitrary rate in [1M,2M]. 626 * 627 * NOTE: B0 is not implemented. 628 */ 629 baud = cp210x_quantise_baudrate(baud); 630 631 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 632 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 633 sizeof(baud))) { 634 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 635 if (old_termios) 636 baud = old_termios->c_ospeed; 637 else 638 baud = 9600; 639 } 640 641 tty_encode_baud_rate(tty, baud, baud); 642 } 643 644 static void cp210x_set_termios(struct tty_struct *tty, 645 struct usb_serial_port *port, struct ktermios *old_termios) 646 { 647 struct device *dev = &port->dev; 648 unsigned int cflag, old_cflag; 649 unsigned int bits; 650 unsigned int modem_ctl[4]; 651 652 dev_dbg(dev, "%s - port %d\n", __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 dev_dbg(dev, "%s - data bits = 5\n", __func__); 671 break; 672 case CS6: 673 bits |= BITS_DATA_6; 674 dev_dbg(dev, "%s - data bits = 6\n", __func__); 675 break; 676 case CS7: 677 bits |= BITS_DATA_7; 678 dev_dbg(dev, "%s - data bits = 7\n", __func__); 679 break; 680 case CS8: 681 bits |= BITS_DATA_8; 682 dev_dbg(dev, "%s - data bits = 8\n", __func__); 683 break; 684 /*case CS9: 685 bits |= BITS_DATA_9; 686 dev_dbg(dev, "%s - data bits = 9\n", __func__); 687 break;*/ 688 default: 689 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 690 bits |= BITS_DATA_8; 691 break; 692 } 693 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 694 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 695 } 696 697 if ((cflag & (PARENB|PARODD|CMSPAR)) != 698 (old_cflag & (PARENB|PARODD|CMSPAR))) { 699 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 700 bits &= ~BITS_PARITY_MASK; 701 if (cflag & PARENB) { 702 if (cflag & CMSPAR) { 703 if (cflag & PARODD) { 704 bits |= BITS_PARITY_MARK; 705 dev_dbg(dev, "%s - parity = MARK\n", __func__); 706 } else { 707 bits |= BITS_PARITY_SPACE; 708 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 709 } 710 } else { 711 if (cflag & PARODD) { 712 bits |= BITS_PARITY_ODD; 713 dev_dbg(dev, "%s - parity = ODD\n", __func__); 714 } else { 715 bits |= BITS_PARITY_EVEN; 716 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 717 } 718 } 719 } 720 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 721 dev_dbg(dev, "Parity mode not supported by device\n"); 722 } 723 724 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 725 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 726 bits &= ~BITS_STOP_MASK; 727 if (cflag & CSTOPB) { 728 bits |= BITS_STOP_2; 729 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 730 } else { 731 bits |= BITS_STOP_1; 732 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 733 } 734 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 735 dev_dbg(dev, "Number of stop bits requested 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 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 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 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 749 } else { 750 modem_ctl[0] &= ~0x7B; 751 modem_ctl[0] |= 0x01; 752 modem_ctl[1] |= 0x40; 753 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 754 } 755 756 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 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 if (set & TIOCM_RTS) { 777 control |= CONTROL_RTS; 778 control |= CONTROL_WRITE_RTS; 779 } 780 if (set & TIOCM_DTR) { 781 control |= CONTROL_DTR; 782 control |= CONTROL_WRITE_DTR; 783 } 784 if (clear & TIOCM_RTS) { 785 control &= ~CONTROL_RTS; 786 control |= CONTROL_WRITE_RTS; 787 } 788 if (clear & TIOCM_DTR) { 789 control &= ~CONTROL_DTR; 790 control |= CONTROL_WRITE_DTR; 791 } 792 793 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 794 795 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 796 } 797 798 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 799 { 800 if (on) 801 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 802 else 803 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 804 } 805 806 static int cp210x_tiocmget(struct tty_struct *tty) 807 { 808 struct usb_serial_port *port = tty->driver_data; 809 unsigned int control; 810 int result; 811 812 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 813 814 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 815 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 816 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 817 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 818 |((control & CONTROL_RING)? TIOCM_RI : 0) 819 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 820 821 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 822 823 return result; 824 } 825 826 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 827 { 828 struct usb_serial_port *port = tty->driver_data; 829 unsigned int state; 830 831 if (break_state == 0) 832 state = BREAK_OFF; 833 else 834 state = BREAK_ON; 835 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 836 state == BREAK_OFF ? "off" : "on"); 837 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 838 } 839 840 static int cp210x_startup(struct usb_serial *serial) 841 { 842 struct usb_host_interface *cur_altsetting; 843 struct cp210x_serial_private *spriv; 844 845 /* cp210x buffers behave strangely unless device is reset */ 846 usb_reset_device(serial->dev); 847 848 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 849 if (!spriv) 850 return -ENOMEM; 851 852 cur_altsetting = serial->interface->cur_altsetting; 853 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 854 855 usb_set_serial_data(serial, spriv); 856 857 return 0; 858 } 859 860 static void cp210x_release(struct usb_serial *serial) 861 { 862 struct cp210x_serial_private *spriv; 863 864 spriv = usb_get_serial_data(serial); 865 kfree(spriv); 866 } 867 868 module_usb_serial_driver(serial_drivers, id_table); 869 870 MODULE_DESCRIPTION(DRIVER_DESC); 871 MODULE_LICENSE("GPL"); 872