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(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 64 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 65 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 66 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 67 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 68 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 69 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 70 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 71 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 72 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 73 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 74 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 75 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 76 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 77 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 78 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 79 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 80 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 81 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 82 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 83 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 84 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 85 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 86 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 87 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 88 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 89 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 90 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 91 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 92 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 93 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 94 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 95 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 96 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 97 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 98 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 99 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 100 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 101 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 102 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 103 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 104 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 105 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 106 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 107 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 108 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 109 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 110 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 111 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 112 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 113 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 114 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 115 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 116 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 117 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 118 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 119 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 120 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 121 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 122 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 123 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 124 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 125 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 126 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 127 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 128 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 129 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 130 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 131 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 132 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 133 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 134 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 135 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 136 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 137 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 138 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 139 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 140 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 141 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 142 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 143 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 144 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 145 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 146 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 147 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 148 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 149 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 150 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 151 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 152 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 153 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 154 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 155 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 156 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 157 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 158 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 159 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 160 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 161 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 162 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 163 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 164 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 165 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 166 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 167 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 168 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 169 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 170 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 171 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 172 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 173 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 174 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 175 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 176 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 177 { } /* Terminating Entry */ 178 }; 179 180 MODULE_DEVICE_TABLE(usb, id_table); 181 182 struct cp210x_serial_private { 183 __u8 bInterfaceNumber; 184 }; 185 186 static struct usb_serial_driver cp210x_device = { 187 .driver = { 188 .owner = THIS_MODULE, 189 .name = "cp210x", 190 }, 191 .id_table = id_table, 192 .num_ports = 1, 193 .bulk_in_size = 256, 194 .bulk_out_size = 256, 195 .open = cp210x_open, 196 .close = cp210x_close, 197 .break_ctl = cp210x_break_ctl, 198 .set_termios = cp210x_set_termios, 199 .tiocmget = cp210x_tiocmget, 200 .tiocmset = cp210x_tiocmset, 201 .attach = cp210x_startup, 202 .release = cp210x_release, 203 .dtr_rts = cp210x_dtr_rts 204 }; 205 206 static struct usb_serial_driver * const serial_drivers[] = { 207 &cp210x_device, NULL 208 }; 209 210 /* Config request types */ 211 #define REQTYPE_HOST_TO_INTERFACE 0x41 212 #define REQTYPE_INTERFACE_TO_HOST 0xc1 213 #define REQTYPE_HOST_TO_DEVICE 0x40 214 #define REQTYPE_DEVICE_TO_HOST 0xc0 215 216 /* Config request codes */ 217 #define CP210X_IFC_ENABLE 0x00 218 #define CP210X_SET_BAUDDIV 0x01 219 #define CP210X_GET_BAUDDIV 0x02 220 #define CP210X_SET_LINE_CTL 0x03 221 #define CP210X_GET_LINE_CTL 0x04 222 #define CP210X_SET_BREAK 0x05 223 #define CP210X_IMM_CHAR 0x06 224 #define CP210X_SET_MHS 0x07 225 #define CP210X_GET_MDMSTS 0x08 226 #define CP210X_SET_XON 0x09 227 #define CP210X_SET_XOFF 0x0A 228 #define CP210X_SET_EVENTMASK 0x0B 229 #define CP210X_GET_EVENTMASK 0x0C 230 #define CP210X_SET_CHAR 0x0D 231 #define CP210X_GET_CHARS 0x0E 232 #define CP210X_GET_PROPS 0x0F 233 #define CP210X_GET_COMM_STATUS 0x10 234 #define CP210X_RESET 0x11 235 #define CP210X_PURGE 0x12 236 #define CP210X_SET_FLOW 0x13 237 #define CP210X_GET_FLOW 0x14 238 #define CP210X_EMBED_EVENTS 0x15 239 #define CP210X_GET_EVENTSTATE 0x16 240 #define CP210X_SET_CHARS 0x19 241 #define CP210X_GET_BAUDRATE 0x1D 242 #define CP210X_SET_BAUDRATE 0x1E 243 244 /* CP210X_IFC_ENABLE */ 245 #define UART_ENABLE 0x0001 246 #define UART_DISABLE 0x0000 247 248 /* CP210X_(SET|GET)_BAUDDIV */ 249 #define BAUD_RATE_GEN_FREQ 0x384000 250 251 /* CP210X_(SET|GET)_LINE_CTL */ 252 #define BITS_DATA_MASK 0X0f00 253 #define BITS_DATA_5 0X0500 254 #define BITS_DATA_6 0X0600 255 #define BITS_DATA_7 0X0700 256 #define BITS_DATA_8 0X0800 257 #define BITS_DATA_9 0X0900 258 259 #define BITS_PARITY_MASK 0x00f0 260 #define BITS_PARITY_NONE 0x0000 261 #define BITS_PARITY_ODD 0x0010 262 #define BITS_PARITY_EVEN 0x0020 263 #define BITS_PARITY_MARK 0x0030 264 #define BITS_PARITY_SPACE 0x0040 265 266 #define BITS_STOP_MASK 0x000f 267 #define BITS_STOP_1 0x0000 268 #define BITS_STOP_1_5 0x0001 269 #define BITS_STOP_2 0x0002 270 271 /* CP210X_SET_BREAK */ 272 #define BREAK_ON 0x0001 273 #define BREAK_OFF 0x0000 274 275 /* CP210X_(SET_MHS|GET_MDMSTS) */ 276 #define CONTROL_DTR 0x0001 277 #define CONTROL_RTS 0x0002 278 #define CONTROL_CTS 0x0010 279 #define CONTROL_DSR 0x0020 280 #define CONTROL_RING 0x0040 281 #define CONTROL_DCD 0x0080 282 #define CONTROL_WRITE_DTR 0x0100 283 #define CONTROL_WRITE_RTS 0x0200 284 285 /* 286 * cp210x_get_config 287 * Reads from the CP210x configuration registers 288 * 'size' is specified in bytes. 289 * 'data' is a pointer to a pre-allocated array of integers large 290 * enough to hold 'size' bytes (with 4 bytes to each integer) 291 */ 292 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 293 unsigned int *data, int size) 294 { 295 struct usb_serial *serial = port->serial; 296 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 297 __le32 *buf; 298 int result, i, length; 299 300 /* Number of integers required to contain the array */ 301 length = (((size - 1) | 3) + 1) / 4; 302 303 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 304 if (!buf) { 305 dev_err(&port->dev, "%s - out of memory.\n", __func__); 306 return -ENOMEM; 307 } 308 309 /* Issue the request, attempting to read 'size' bytes */ 310 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 311 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 312 spriv->bInterfaceNumber, buf, size, 313 USB_CTRL_GET_TIMEOUT); 314 315 /* Convert data into an array of integers */ 316 for (i = 0; i < length; i++) 317 data[i] = le32_to_cpu(buf[i]); 318 319 kfree(buf); 320 321 if (result != size) { 322 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 323 __func__, request, size, result); 324 if (result > 0) 325 result = -EPROTO; 326 327 return result; 328 } 329 330 return 0; 331 } 332 333 /* 334 * cp210x_set_config 335 * Writes to the CP210x configuration registers 336 * Values less than 16 bits wide are sent directly 337 * 'size' is specified in bytes. 338 */ 339 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 340 unsigned int *data, int size) 341 { 342 struct usb_serial *serial = port->serial; 343 struct cp210x_serial_private *spriv = usb_get_serial_data(serial); 344 __le32 *buf; 345 int result, i, length; 346 347 /* Number of integers required to contain the array */ 348 length = (((size - 1) | 3) + 1) / 4; 349 350 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 351 if (!buf) { 352 dev_err(&port->dev, "%s - out of memory.\n", __func__); 353 return -ENOMEM; 354 } 355 356 /* Array of integers into bytes */ 357 for (i = 0; i < length; i++) 358 buf[i] = cpu_to_le32(data[i]); 359 360 if (size > 2) { 361 result = usb_control_msg(serial->dev, 362 usb_sndctrlpipe(serial->dev, 0), 363 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 364 spriv->bInterfaceNumber, buf, size, 365 USB_CTRL_SET_TIMEOUT); 366 } else { 367 result = usb_control_msg(serial->dev, 368 usb_sndctrlpipe(serial->dev, 0), 369 request, REQTYPE_HOST_TO_INTERFACE, data[0], 370 spriv->bInterfaceNumber, NULL, 0, 371 USB_CTRL_SET_TIMEOUT); 372 } 373 374 kfree(buf); 375 376 if ((size > 2 && result != size) || result < 0) { 377 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 378 __func__, request, size, result); 379 if (result > 0) 380 result = -EPROTO; 381 382 return result; 383 } 384 385 return 0; 386 } 387 388 /* 389 * cp210x_set_config_single 390 * Convenience function for calling cp210x_set_config on single data values 391 * without requiring an integer pointer 392 */ 393 static inline int cp210x_set_config_single(struct usb_serial_port *port, 394 u8 request, unsigned int data) 395 { 396 return cp210x_set_config(port, request, &data, 2); 397 } 398 399 /* 400 * cp210x_quantise_baudrate 401 * Quantises the baud rate as per AN205 Table 1 402 */ 403 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 404 { 405 if (baud <= 300) 406 baud = 300; 407 else if (baud <= 600) baud = 600; 408 else if (baud <= 1200) baud = 1200; 409 else if (baud <= 1800) baud = 1800; 410 else if (baud <= 2400) baud = 2400; 411 else if (baud <= 4000) baud = 4000; 412 else if (baud <= 4803) baud = 4800; 413 else if (baud <= 7207) baud = 7200; 414 else if (baud <= 9612) baud = 9600; 415 else if (baud <= 14428) baud = 14400; 416 else if (baud <= 16062) baud = 16000; 417 else if (baud <= 19250) baud = 19200; 418 else if (baud <= 28912) baud = 28800; 419 else if (baud <= 38601) baud = 38400; 420 else if (baud <= 51558) baud = 51200; 421 else if (baud <= 56280) baud = 56000; 422 else if (baud <= 58053) baud = 57600; 423 else if (baud <= 64111) baud = 64000; 424 else if (baud <= 77608) baud = 76800; 425 else if (baud <= 117028) baud = 115200; 426 else if (baud <= 129347) baud = 128000; 427 else if (baud <= 156868) baud = 153600; 428 else if (baud <= 237832) baud = 230400; 429 else if (baud <= 254234) baud = 250000; 430 else if (baud <= 273066) baud = 256000; 431 else if (baud <= 491520) baud = 460800; 432 else if (baud <= 567138) baud = 500000; 433 else if (baud <= 670254) baud = 576000; 434 else if (baud < 1000000) 435 baud = 921600; 436 else if (baud > 2000000) 437 baud = 2000000; 438 return baud; 439 } 440 441 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 442 { 443 int result; 444 445 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 446 UART_ENABLE); 447 if (result) { 448 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 449 return result; 450 } 451 452 /* Configure the termios structure */ 453 cp210x_get_termios(tty, port); 454 455 /* The baud rate must be initialised on cp2104 */ 456 if (tty) 457 cp210x_change_speed(tty, port, NULL); 458 459 return usb_serial_generic_open(tty, port); 460 } 461 462 static void cp210x_close(struct usb_serial_port *port) 463 { 464 usb_serial_generic_close(port); 465 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 466 } 467 468 /* 469 * cp210x_get_termios 470 * Reads the baud rate, data bits, parity, stop bits and flow control mode 471 * from the device, corrects any unsupported values, and configures the 472 * termios structure to reflect the state of the device 473 */ 474 static void cp210x_get_termios(struct tty_struct *tty, 475 struct usb_serial_port *port) 476 { 477 unsigned int baud; 478 479 if (tty) { 480 cp210x_get_termios_port(tty->driver_data, 481 &tty->termios.c_cflag, &baud); 482 tty_encode_baud_rate(tty, baud, baud); 483 } else { 484 unsigned int cflag; 485 cflag = 0; 486 cp210x_get_termios_port(port, &cflag, &baud); 487 } 488 } 489 490 /* 491 * cp210x_get_termios_port 492 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 493 */ 494 static void cp210x_get_termios_port(struct usb_serial_port *port, 495 unsigned int *cflagp, unsigned int *baudp) 496 { 497 struct device *dev = &port->dev; 498 unsigned int cflag, modem_ctl[4]; 499 unsigned int baud; 500 unsigned int bits; 501 502 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 503 504 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 505 *baudp = baud; 506 507 cflag = *cflagp; 508 509 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 510 cflag &= ~CSIZE; 511 switch (bits & BITS_DATA_MASK) { 512 case BITS_DATA_5: 513 dev_dbg(dev, "%s - data bits = 5\n", __func__); 514 cflag |= CS5; 515 break; 516 case BITS_DATA_6: 517 dev_dbg(dev, "%s - data bits = 6\n", __func__); 518 cflag |= CS6; 519 break; 520 case BITS_DATA_7: 521 dev_dbg(dev, "%s - data bits = 7\n", __func__); 522 cflag |= CS7; 523 break; 524 case BITS_DATA_8: 525 dev_dbg(dev, "%s - data bits = 8\n", __func__); 526 cflag |= CS8; 527 break; 528 case BITS_DATA_9: 529 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 530 cflag |= CS8; 531 bits &= ~BITS_DATA_MASK; 532 bits |= BITS_DATA_8; 533 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 534 break; 535 default: 536 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 537 cflag |= CS8; 538 bits &= ~BITS_DATA_MASK; 539 bits |= BITS_DATA_8; 540 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 541 break; 542 } 543 544 switch (bits & BITS_PARITY_MASK) { 545 case BITS_PARITY_NONE: 546 dev_dbg(dev, "%s - parity = NONE\n", __func__); 547 cflag &= ~PARENB; 548 break; 549 case BITS_PARITY_ODD: 550 dev_dbg(dev, "%s - parity = ODD\n", __func__); 551 cflag |= (PARENB|PARODD); 552 break; 553 case BITS_PARITY_EVEN: 554 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 555 cflag &= ~PARODD; 556 cflag |= PARENB; 557 break; 558 case BITS_PARITY_MARK: 559 dev_dbg(dev, "%s - parity = MARK\n", __func__); 560 cflag |= (PARENB|PARODD|CMSPAR); 561 break; 562 case BITS_PARITY_SPACE: 563 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 564 cflag &= ~PARODD; 565 cflag |= (PARENB|CMSPAR); 566 break; 567 default: 568 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 569 cflag &= ~PARENB; 570 bits &= ~BITS_PARITY_MASK; 571 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 572 break; 573 } 574 575 cflag &= ~CSTOPB; 576 switch (bits & BITS_STOP_MASK) { 577 case BITS_STOP_1: 578 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 579 break; 580 case BITS_STOP_1_5: 581 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, 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 case BITS_STOP_2: 586 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 587 cflag |= CSTOPB; 588 break; 589 default: 590 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 591 bits &= ~BITS_STOP_MASK; 592 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 593 break; 594 } 595 596 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 597 if (modem_ctl[0] & 0x0008) { 598 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 599 cflag |= CRTSCTS; 600 } else { 601 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 602 cflag &= ~CRTSCTS; 603 } 604 605 *cflagp = cflag; 606 } 607 608 /* 609 * CP2101 supports the following baud rates: 610 * 611 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 612 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 613 * 614 * CP2102 and CP2103 support the following additional rates: 615 * 616 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 617 * 576000 618 * 619 * The device will map a requested rate to a supported one, but the result 620 * of requests for rates greater than 1053257 is undefined (see AN205). 621 * 622 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 623 * respectively, with an error less than 1%. The actual rates are determined 624 * by 625 * 626 * div = round(freq / (2 x prescale x request)) 627 * actual = freq / (2 x prescale x div) 628 * 629 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 630 * or 1 otherwise. 631 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 632 * otherwise. 633 */ 634 static void cp210x_change_speed(struct tty_struct *tty, 635 struct usb_serial_port *port, struct ktermios *old_termios) 636 { 637 u32 baud; 638 639 baud = tty->termios.c_ospeed; 640 641 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 642 * or to an arbitrary rate in [1M,2M]. 643 * 644 * NOTE: B0 is not implemented. 645 */ 646 baud = cp210x_quantise_baudrate(baud); 647 648 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 649 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 650 sizeof(baud))) { 651 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 652 if (old_termios) 653 baud = old_termios->c_ospeed; 654 else 655 baud = 9600; 656 } 657 658 tty_encode_baud_rate(tty, baud, baud); 659 } 660 661 static void cp210x_set_termios(struct tty_struct *tty, 662 struct usb_serial_port *port, struct ktermios *old_termios) 663 { 664 struct device *dev = &port->dev; 665 unsigned int cflag, old_cflag; 666 unsigned int bits; 667 unsigned int modem_ctl[4]; 668 669 if (!tty) 670 return; 671 672 cflag = tty->termios.c_cflag; 673 old_cflag = old_termios->c_cflag; 674 675 if (tty->termios.c_ospeed != old_termios->c_ospeed) 676 cp210x_change_speed(tty, port, old_termios); 677 678 /* If the number of data bits is to be updated */ 679 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 680 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 681 bits &= ~BITS_DATA_MASK; 682 switch (cflag & CSIZE) { 683 case CS5: 684 bits |= BITS_DATA_5; 685 dev_dbg(dev, "%s - data bits = 5\n", __func__); 686 break; 687 case CS6: 688 bits |= BITS_DATA_6; 689 dev_dbg(dev, "%s - data bits = 6\n", __func__); 690 break; 691 case CS7: 692 bits |= BITS_DATA_7; 693 dev_dbg(dev, "%s - data bits = 7\n", __func__); 694 break; 695 case CS8: 696 bits |= BITS_DATA_8; 697 dev_dbg(dev, "%s - data bits = 8\n", __func__); 698 break; 699 /*case CS9: 700 bits |= BITS_DATA_9; 701 dev_dbg(dev, "%s - data bits = 9\n", __func__); 702 break;*/ 703 default: 704 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 705 bits |= BITS_DATA_8; 706 break; 707 } 708 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 709 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 710 } 711 712 if ((cflag & (PARENB|PARODD|CMSPAR)) != 713 (old_cflag & (PARENB|PARODD|CMSPAR))) { 714 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 715 bits &= ~BITS_PARITY_MASK; 716 if (cflag & PARENB) { 717 if (cflag & CMSPAR) { 718 if (cflag & PARODD) { 719 bits |= BITS_PARITY_MARK; 720 dev_dbg(dev, "%s - parity = MARK\n", __func__); 721 } else { 722 bits |= BITS_PARITY_SPACE; 723 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 724 } 725 } else { 726 if (cflag & PARODD) { 727 bits |= BITS_PARITY_ODD; 728 dev_dbg(dev, "%s - parity = ODD\n", __func__); 729 } else { 730 bits |= BITS_PARITY_EVEN; 731 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 732 } 733 } 734 } 735 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 736 dev_dbg(dev, "Parity mode not supported by device\n"); 737 } 738 739 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 740 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2); 741 bits &= ~BITS_STOP_MASK; 742 if (cflag & CSTOPB) { 743 bits |= BITS_STOP_2; 744 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 745 } else { 746 bits |= BITS_STOP_1; 747 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 748 } 749 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 750 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 751 } 752 753 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 754 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 755 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 756 __func__, modem_ctl[0], modem_ctl[1], 757 modem_ctl[2], modem_ctl[3]); 758 759 if (cflag & CRTSCTS) { 760 modem_ctl[0] &= ~0x7B; 761 modem_ctl[0] |= 0x09; 762 modem_ctl[1] = 0x80; 763 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 764 } else { 765 modem_ctl[0] &= ~0x7B; 766 modem_ctl[0] |= 0x01; 767 modem_ctl[1] |= 0x40; 768 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 769 } 770 771 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 772 __func__, modem_ctl[0], modem_ctl[1], 773 modem_ctl[2], modem_ctl[3]); 774 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 775 } 776 777 } 778 779 static int cp210x_tiocmset(struct tty_struct *tty, 780 unsigned int set, unsigned int clear) 781 { 782 struct usb_serial_port *port = tty->driver_data; 783 return cp210x_tiocmset_port(port, set, clear); 784 } 785 786 static int cp210x_tiocmset_port(struct usb_serial_port *port, 787 unsigned int set, unsigned int clear) 788 { 789 unsigned int control = 0; 790 791 if (set & TIOCM_RTS) { 792 control |= CONTROL_RTS; 793 control |= CONTROL_WRITE_RTS; 794 } 795 if (set & TIOCM_DTR) { 796 control |= CONTROL_DTR; 797 control |= CONTROL_WRITE_DTR; 798 } 799 if (clear & TIOCM_RTS) { 800 control &= ~CONTROL_RTS; 801 control |= CONTROL_WRITE_RTS; 802 } 803 if (clear & TIOCM_DTR) { 804 control &= ~CONTROL_DTR; 805 control |= CONTROL_WRITE_DTR; 806 } 807 808 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 809 810 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 811 } 812 813 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 814 { 815 if (on) 816 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 817 else 818 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 819 } 820 821 static int cp210x_tiocmget(struct tty_struct *tty) 822 { 823 struct usb_serial_port *port = tty->driver_data; 824 unsigned int control; 825 int result; 826 827 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 828 829 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 830 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 831 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 832 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 833 |((control & CONTROL_RING)? TIOCM_RI : 0) 834 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 835 836 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 837 838 return result; 839 } 840 841 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 842 { 843 struct usb_serial_port *port = tty->driver_data; 844 unsigned int state; 845 846 if (break_state == 0) 847 state = BREAK_OFF; 848 else 849 state = BREAK_ON; 850 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 851 state == BREAK_OFF ? "off" : "on"); 852 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 853 } 854 855 static int cp210x_startup(struct usb_serial *serial) 856 { 857 struct usb_host_interface *cur_altsetting; 858 struct cp210x_serial_private *spriv; 859 860 /* cp210x buffers behave strangely unless device is reset */ 861 usb_reset_device(serial->dev); 862 863 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 864 if (!spriv) 865 return -ENOMEM; 866 867 cur_altsetting = serial->interface->cur_altsetting; 868 spriv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 869 870 usb_set_serial_data(serial, spriv); 871 872 return 0; 873 } 874 875 static void cp210x_release(struct usb_serial *serial) 876 { 877 struct cp210x_serial_private *spriv; 878 879 spriv = usb_get_serial_data(serial); 880 kfree(spriv); 881 } 882 883 module_usb_serial_driver(serial_drivers, id_table); 884 885 MODULE_DESCRIPTION(DRIVER_DESC); 886 MODULE_LICENSE("GPL"); 887