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 bool cp210x_tx_empty(struct usb_serial_port *port); 42 static int cp210x_tiocmget(struct tty_struct *); 43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 44 static int cp210x_tiocmset_port(struct usb_serial_port *port, 45 unsigned int, unsigned int); 46 static void cp210x_break_ctl(struct tty_struct *, int); 47 static int cp210x_port_probe(struct usb_serial_port *); 48 static int cp210x_port_remove(struct usb_serial_port *); 49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 50 51 static const struct usb_device_id id_table[] = { 52 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 53 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 54 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 55 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 56 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 57 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 58 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 59 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 60 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 61 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 62 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 66 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 75 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 76 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 77 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 78 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 79 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 80 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 81 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 82 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 83 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 84 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 85 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 86 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 87 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 88 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 89 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 90 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 91 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 94 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 102 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 103 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 104 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 105 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 106 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 107 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 108 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 109 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 110 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 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, 0x85F8) }, /* Virtenio Preon32 */ 124 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 125 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 126 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 127 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 128 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 129 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 130 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 131 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 132 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 133 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 134 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 135 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 136 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 137 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 138 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 139 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 140 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 141 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 142 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 143 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 144 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 145 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 146 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 147 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 148 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 149 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 150 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 151 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 152 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 153 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 154 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 155 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 156 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 157 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 158 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 159 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 160 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 161 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 162 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 163 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 164 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 165 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 166 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 167 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 168 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 169 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 170 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 171 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 172 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 173 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 174 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 175 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 176 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 177 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 178 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 179 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 180 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 181 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 182 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 183 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 184 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 185 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 186 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 187 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 188 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 189 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 190 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 191 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 192 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 193 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 194 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 195 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 196 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 197 { } /* Terminating Entry */ 198 }; 199 200 MODULE_DEVICE_TABLE(usb, id_table); 201 202 struct cp210x_port_private { 203 __u8 bInterfaceNumber; 204 bool has_swapped_line_ctl; 205 }; 206 207 static struct usb_serial_driver cp210x_device = { 208 .driver = { 209 .owner = THIS_MODULE, 210 .name = "cp210x", 211 }, 212 .id_table = id_table, 213 .num_ports = 1, 214 .bulk_in_size = 256, 215 .bulk_out_size = 256, 216 .open = cp210x_open, 217 .close = cp210x_close, 218 .break_ctl = cp210x_break_ctl, 219 .set_termios = cp210x_set_termios, 220 .tx_empty = cp210x_tx_empty, 221 .tiocmget = cp210x_tiocmget, 222 .tiocmset = cp210x_tiocmset, 223 .port_probe = cp210x_port_probe, 224 .port_remove = cp210x_port_remove, 225 .dtr_rts = cp210x_dtr_rts 226 }; 227 228 static struct usb_serial_driver * const serial_drivers[] = { 229 &cp210x_device, NULL 230 }; 231 232 /* Config request types */ 233 #define REQTYPE_HOST_TO_INTERFACE 0x41 234 #define REQTYPE_INTERFACE_TO_HOST 0xc1 235 #define REQTYPE_HOST_TO_DEVICE 0x40 236 #define REQTYPE_DEVICE_TO_HOST 0xc0 237 238 /* Config request codes */ 239 #define CP210X_IFC_ENABLE 0x00 240 #define CP210X_SET_BAUDDIV 0x01 241 #define CP210X_GET_BAUDDIV 0x02 242 #define CP210X_SET_LINE_CTL 0x03 243 #define CP210X_GET_LINE_CTL 0x04 244 #define CP210X_SET_BREAK 0x05 245 #define CP210X_IMM_CHAR 0x06 246 #define CP210X_SET_MHS 0x07 247 #define CP210X_GET_MDMSTS 0x08 248 #define CP210X_SET_XON 0x09 249 #define CP210X_SET_XOFF 0x0A 250 #define CP210X_SET_EVENTMASK 0x0B 251 #define CP210X_GET_EVENTMASK 0x0C 252 #define CP210X_SET_CHAR 0x0D 253 #define CP210X_GET_CHARS 0x0E 254 #define CP210X_GET_PROPS 0x0F 255 #define CP210X_GET_COMM_STATUS 0x10 256 #define CP210X_RESET 0x11 257 #define CP210X_PURGE 0x12 258 #define CP210X_SET_FLOW 0x13 259 #define CP210X_GET_FLOW 0x14 260 #define CP210X_EMBED_EVENTS 0x15 261 #define CP210X_GET_EVENTSTATE 0x16 262 #define CP210X_SET_CHARS 0x19 263 #define CP210X_GET_BAUDRATE 0x1D 264 #define CP210X_SET_BAUDRATE 0x1E 265 266 /* CP210X_IFC_ENABLE */ 267 #define UART_ENABLE 0x0001 268 #define UART_DISABLE 0x0000 269 270 /* CP210X_(SET|GET)_BAUDDIV */ 271 #define BAUD_RATE_GEN_FREQ 0x384000 272 273 /* CP210X_(SET|GET)_LINE_CTL */ 274 #define BITS_DATA_MASK 0X0f00 275 #define BITS_DATA_5 0X0500 276 #define BITS_DATA_6 0X0600 277 #define BITS_DATA_7 0X0700 278 #define BITS_DATA_8 0X0800 279 #define BITS_DATA_9 0X0900 280 281 #define BITS_PARITY_MASK 0x00f0 282 #define BITS_PARITY_NONE 0x0000 283 #define BITS_PARITY_ODD 0x0010 284 #define BITS_PARITY_EVEN 0x0020 285 #define BITS_PARITY_MARK 0x0030 286 #define BITS_PARITY_SPACE 0x0040 287 288 #define BITS_STOP_MASK 0x000f 289 #define BITS_STOP_1 0x0000 290 #define BITS_STOP_1_5 0x0001 291 #define BITS_STOP_2 0x0002 292 293 /* CP210X_SET_BREAK */ 294 #define BREAK_ON 0x0001 295 #define BREAK_OFF 0x0000 296 297 /* CP210X_(SET_MHS|GET_MDMSTS) */ 298 #define CONTROL_DTR 0x0001 299 #define CONTROL_RTS 0x0002 300 #define CONTROL_CTS 0x0010 301 #define CONTROL_DSR 0x0020 302 #define CONTROL_RING 0x0040 303 #define CONTROL_DCD 0x0080 304 #define CONTROL_WRITE_DTR 0x0100 305 #define CONTROL_WRITE_RTS 0x0200 306 307 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 308 struct cp210x_comm_status { 309 __le32 ulErrors; 310 __le32 ulHoldReasons; 311 __le32 ulAmountInInQueue; 312 __le32 ulAmountInOutQueue; 313 u8 bEofReceived; 314 u8 bWaitForImmediate; 315 u8 bReserved; 316 } __packed; 317 318 /* 319 * CP210X_PURGE - 16 bits passed in wValue of USB request. 320 * SiLabs app note AN571 gives a strange description of the 4 bits: 321 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 322 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 323 */ 324 #define PURGE_ALL 0x000f 325 326 /* 327 * cp210x_get_config 328 * Reads from the CP210x configuration registers 329 * 'size' is specified in bytes. 330 * 'data' is a pointer to a pre-allocated array of integers large 331 * enough to hold 'size' bytes (with 4 bytes to each integer) 332 */ 333 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 334 unsigned int *data, int size) 335 { 336 struct usb_serial *serial = port->serial; 337 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 338 __le32 *buf; 339 int result, i, length; 340 341 /* Number of integers required to contain the array */ 342 length = (((size - 1) | 3) + 1) / 4; 343 344 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 345 if (!buf) 346 return -ENOMEM; 347 348 /* Issue the request, attempting to read 'size' bytes */ 349 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 350 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 351 port_priv->bInterfaceNumber, buf, size, 352 USB_CTRL_GET_TIMEOUT); 353 354 /* Convert data into an array of integers */ 355 for (i = 0; i < length; i++) 356 data[i] = le32_to_cpu(buf[i]); 357 358 kfree(buf); 359 360 if (result != size) { 361 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 362 __func__, request, size, result); 363 if (result > 0) 364 result = -EPROTO; 365 366 return result; 367 } 368 369 return 0; 370 } 371 372 /* 373 * cp210x_set_config 374 * Writes to the CP210x configuration registers 375 * Values less than 16 bits wide are sent directly 376 * 'size' is specified in bytes. 377 */ 378 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 379 unsigned int *data, int size) 380 { 381 struct usb_serial *serial = port->serial; 382 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 383 __le32 *buf; 384 int result, i, length; 385 386 /* Number of integers required to contain the array */ 387 length = (((size - 1) | 3) + 1) / 4; 388 389 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 390 if (!buf) 391 return -ENOMEM; 392 393 /* Array of integers into bytes */ 394 for (i = 0; i < length; i++) 395 buf[i] = cpu_to_le32(data[i]); 396 397 if (size > 2) { 398 result = usb_control_msg(serial->dev, 399 usb_sndctrlpipe(serial->dev, 0), 400 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 401 port_priv->bInterfaceNumber, buf, size, 402 USB_CTRL_SET_TIMEOUT); 403 } else { 404 result = usb_control_msg(serial->dev, 405 usb_sndctrlpipe(serial->dev, 0), 406 request, REQTYPE_HOST_TO_INTERFACE, data[0], 407 port_priv->bInterfaceNumber, NULL, 0, 408 USB_CTRL_SET_TIMEOUT); 409 } 410 411 kfree(buf); 412 413 if ((size > 2 && result != size) || result < 0) { 414 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 415 __func__, request, size, result); 416 if (result > 0) 417 result = -EPROTO; 418 419 return result; 420 } 421 422 return 0; 423 } 424 425 /* 426 * Reads a variable-sized block of CP210X_ registers, identified by req. 427 * Returns data into buf in native USB byte order. 428 */ 429 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 430 void *buf, int bufsize) 431 { 432 struct usb_serial *serial = port->serial; 433 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 434 void *dmabuf; 435 int result; 436 437 dmabuf = kmalloc(bufsize, GFP_KERNEL); 438 if (!dmabuf) { 439 /* 440 * FIXME Some callers don't bother to check for error, 441 * at least give them consistent junk until they are fixed 442 */ 443 memset(buf, 0, bufsize); 444 return -ENOMEM; 445 } 446 447 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 448 req, REQTYPE_INTERFACE_TO_HOST, 0, 449 port_priv->bInterfaceNumber, dmabuf, bufsize, 450 USB_CTRL_SET_TIMEOUT); 451 if (result == bufsize) { 452 memcpy(buf, dmabuf, bufsize); 453 result = 0; 454 } else { 455 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 456 req, bufsize, result); 457 if (result >= 0) 458 result = -EPROTO; 459 460 /* 461 * FIXME Some callers don't bother to check for error, 462 * at least give them consistent junk until they are fixed 463 */ 464 memset(buf, 0, bufsize); 465 } 466 467 kfree(dmabuf); 468 469 return result; 470 } 471 472 /* 473 * Reads any 16-bit CP210X_ register identified by req. 474 */ 475 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 476 { 477 __le16 le16_val; 478 int err; 479 480 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 481 if (err) 482 return err; 483 484 *val = le16_to_cpu(le16_val); 485 return 0; 486 } 487 488 /* 489 * Writes any 16-bit CP210X_ register (req) whose value is passed 490 * entirely in the wValue field of the USB request. 491 */ 492 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 493 { 494 struct usb_serial *serial = port->serial; 495 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 496 int result; 497 498 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 499 req, REQTYPE_HOST_TO_INTERFACE, val, 500 port_priv->bInterfaceNumber, NULL, 0, 501 USB_CTRL_SET_TIMEOUT); 502 if (result < 0) { 503 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 504 req, result); 505 } 506 507 return result; 508 } 509 510 /* 511 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 512 * Write a known good value 0x800, read it back. 513 * If it comes back swapped the bug is detected. 514 * Preserve the original register value. 515 */ 516 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 517 { 518 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 519 u16 line_ctl_save; 520 u16 line_ctl_test; 521 int err; 522 523 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 524 if (err) 525 return err; 526 527 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 528 if (err) 529 return err; 530 531 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 532 if (err) 533 return err; 534 535 if (line_ctl_test == 8) { 536 port_priv->has_swapped_line_ctl = true; 537 line_ctl_save = swab16(line_ctl_save); 538 } 539 540 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 541 } 542 543 /* 544 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 545 * to workaround cp2108 bug and get correct value. 546 */ 547 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 548 { 549 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 550 int err; 551 552 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 553 if (err) 554 return err; 555 556 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 557 if (port_priv->has_swapped_line_ctl) 558 *ctl = swab16(*ctl); 559 560 return 0; 561 } 562 563 /* 564 * cp210x_quantise_baudrate 565 * Quantises the baud rate as per AN205 Table 1 566 */ 567 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 568 { 569 if (baud <= 300) 570 baud = 300; 571 else if (baud <= 600) baud = 600; 572 else if (baud <= 1200) baud = 1200; 573 else if (baud <= 1800) baud = 1800; 574 else if (baud <= 2400) baud = 2400; 575 else if (baud <= 4000) baud = 4000; 576 else if (baud <= 4803) baud = 4800; 577 else if (baud <= 7207) baud = 7200; 578 else if (baud <= 9612) baud = 9600; 579 else if (baud <= 14428) baud = 14400; 580 else if (baud <= 16062) baud = 16000; 581 else if (baud <= 19250) baud = 19200; 582 else if (baud <= 28912) baud = 28800; 583 else if (baud <= 38601) baud = 38400; 584 else if (baud <= 51558) baud = 51200; 585 else if (baud <= 56280) baud = 56000; 586 else if (baud <= 58053) baud = 57600; 587 else if (baud <= 64111) baud = 64000; 588 else if (baud <= 77608) baud = 76800; 589 else if (baud <= 117028) baud = 115200; 590 else if (baud <= 129347) baud = 128000; 591 else if (baud <= 156868) baud = 153600; 592 else if (baud <= 237832) baud = 230400; 593 else if (baud <= 254234) baud = 250000; 594 else if (baud <= 273066) baud = 256000; 595 else if (baud <= 491520) baud = 460800; 596 else if (baud <= 567138) baud = 500000; 597 else if (baud <= 670254) baud = 576000; 598 else if (baud < 1000000) 599 baud = 921600; 600 else if (baud > 2000000) 601 baud = 2000000; 602 return baud; 603 } 604 605 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 606 { 607 int result; 608 609 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 610 if (result) { 611 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 612 return result; 613 } 614 615 /* Configure the termios structure */ 616 cp210x_get_termios(tty, port); 617 618 /* The baud rate must be initialised on cp2104 */ 619 if (tty) 620 cp210x_change_speed(tty, port, NULL); 621 622 return usb_serial_generic_open(tty, port); 623 } 624 625 static void cp210x_close(struct usb_serial_port *port) 626 { 627 usb_serial_generic_close(port); 628 629 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 630 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 631 632 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 633 } 634 635 /* 636 * Read how many bytes are waiting in the TX queue. 637 */ 638 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 639 u32 *count) 640 { 641 struct usb_serial *serial = port->serial; 642 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 643 struct cp210x_comm_status *sts; 644 int result; 645 646 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 647 if (!sts) 648 return -ENOMEM; 649 650 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 651 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 652 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 653 USB_CTRL_GET_TIMEOUT); 654 if (result == sizeof(*sts)) { 655 *count = le32_to_cpu(sts->ulAmountInOutQueue); 656 result = 0; 657 } else { 658 dev_err(&port->dev, "failed to get comm status: %d\n", result); 659 if (result >= 0) 660 result = -EPROTO; 661 } 662 663 kfree(sts); 664 665 return result; 666 } 667 668 static bool cp210x_tx_empty(struct usb_serial_port *port) 669 { 670 int err; 671 u32 count; 672 673 err = cp210x_get_tx_queue_byte_count(port, &count); 674 if (err) 675 return true; 676 677 return !count; 678 } 679 680 /* 681 * cp210x_get_termios 682 * Reads the baud rate, data bits, parity, stop bits and flow control mode 683 * from the device, corrects any unsupported values, and configures the 684 * termios structure to reflect the state of the device 685 */ 686 static void cp210x_get_termios(struct tty_struct *tty, 687 struct usb_serial_port *port) 688 { 689 unsigned int baud; 690 691 if (tty) { 692 cp210x_get_termios_port(tty->driver_data, 693 &tty->termios.c_cflag, &baud); 694 tty_encode_baud_rate(tty, baud, baud); 695 } else { 696 unsigned int cflag; 697 cflag = 0; 698 cp210x_get_termios_port(port, &cflag, &baud); 699 } 700 } 701 702 /* 703 * cp210x_get_termios_port 704 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 705 */ 706 static void cp210x_get_termios_port(struct usb_serial_port *port, 707 unsigned int *cflagp, unsigned int *baudp) 708 { 709 struct device *dev = &port->dev; 710 unsigned int cflag, modem_ctl[4]; 711 unsigned int baud; 712 u16 bits; 713 714 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 715 716 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 717 *baudp = baud; 718 719 cflag = *cflagp; 720 721 cp210x_get_line_ctl(port, &bits); 722 cflag &= ~CSIZE; 723 switch (bits & BITS_DATA_MASK) { 724 case BITS_DATA_5: 725 dev_dbg(dev, "%s - data bits = 5\n", __func__); 726 cflag |= CS5; 727 break; 728 case BITS_DATA_6: 729 dev_dbg(dev, "%s - data bits = 6\n", __func__); 730 cflag |= CS6; 731 break; 732 case BITS_DATA_7: 733 dev_dbg(dev, "%s - data bits = 7\n", __func__); 734 cflag |= CS7; 735 break; 736 case BITS_DATA_8: 737 dev_dbg(dev, "%s - data bits = 8\n", __func__); 738 cflag |= CS8; 739 break; 740 case BITS_DATA_9: 741 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 742 cflag |= CS8; 743 bits &= ~BITS_DATA_MASK; 744 bits |= BITS_DATA_8; 745 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 746 break; 747 default: 748 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 749 cflag |= CS8; 750 bits &= ~BITS_DATA_MASK; 751 bits |= BITS_DATA_8; 752 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 753 break; 754 } 755 756 switch (bits & BITS_PARITY_MASK) { 757 case BITS_PARITY_NONE: 758 dev_dbg(dev, "%s - parity = NONE\n", __func__); 759 cflag &= ~PARENB; 760 break; 761 case BITS_PARITY_ODD: 762 dev_dbg(dev, "%s - parity = ODD\n", __func__); 763 cflag |= (PARENB|PARODD); 764 break; 765 case BITS_PARITY_EVEN: 766 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 767 cflag &= ~PARODD; 768 cflag |= PARENB; 769 break; 770 case BITS_PARITY_MARK: 771 dev_dbg(dev, "%s - parity = MARK\n", __func__); 772 cflag |= (PARENB|PARODD|CMSPAR); 773 break; 774 case BITS_PARITY_SPACE: 775 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 776 cflag &= ~PARODD; 777 cflag |= (PARENB|CMSPAR); 778 break; 779 default: 780 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 781 cflag &= ~PARENB; 782 bits &= ~BITS_PARITY_MASK; 783 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 784 break; 785 } 786 787 cflag &= ~CSTOPB; 788 switch (bits & BITS_STOP_MASK) { 789 case BITS_STOP_1: 790 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 791 break; 792 case BITS_STOP_1_5: 793 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 794 bits &= ~BITS_STOP_MASK; 795 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 796 break; 797 case BITS_STOP_2: 798 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 799 cflag |= CSTOPB; 800 break; 801 default: 802 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 803 bits &= ~BITS_STOP_MASK; 804 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 805 break; 806 } 807 808 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 809 if (modem_ctl[0] & 0x0008) { 810 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 811 cflag |= CRTSCTS; 812 } else { 813 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 814 cflag &= ~CRTSCTS; 815 } 816 817 *cflagp = cflag; 818 } 819 820 /* 821 * CP2101 supports the following baud rates: 822 * 823 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 824 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 825 * 826 * CP2102 and CP2103 support the following additional rates: 827 * 828 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 829 * 576000 830 * 831 * The device will map a requested rate to a supported one, but the result 832 * of requests for rates greater than 1053257 is undefined (see AN205). 833 * 834 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 835 * respectively, with an error less than 1%. The actual rates are determined 836 * by 837 * 838 * div = round(freq / (2 x prescale x request)) 839 * actual = freq / (2 x prescale x div) 840 * 841 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 842 * or 1 otherwise. 843 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 844 * otherwise. 845 */ 846 static void cp210x_change_speed(struct tty_struct *tty, 847 struct usb_serial_port *port, struct ktermios *old_termios) 848 { 849 u32 baud; 850 851 baud = tty->termios.c_ospeed; 852 853 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 854 * or to an arbitrary rate in [1M,2M]. 855 * 856 * NOTE: B0 is not implemented. 857 */ 858 baud = cp210x_quantise_baudrate(baud); 859 860 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 861 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 862 sizeof(baud))) { 863 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 864 if (old_termios) 865 baud = old_termios->c_ospeed; 866 else 867 baud = 9600; 868 } 869 870 tty_encode_baud_rate(tty, baud, baud); 871 } 872 873 static void cp210x_set_termios(struct tty_struct *tty, 874 struct usb_serial_port *port, struct ktermios *old_termios) 875 { 876 struct device *dev = &port->dev; 877 unsigned int cflag, old_cflag; 878 u16 bits; 879 unsigned int modem_ctl[4]; 880 881 cflag = tty->termios.c_cflag; 882 old_cflag = old_termios->c_cflag; 883 884 if (tty->termios.c_ospeed != old_termios->c_ospeed) 885 cp210x_change_speed(tty, port, old_termios); 886 887 /* If the number of data bits is to be updated */ 888 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 889 cp210x_get_line_ctl(port, &bits); 890 bits &= ~BITS_DATA_MASK; 891 switch (cflag & CSIZE) { 892 case CS5: 893 bits |= BITS_DATA_5; 894 dev_dbg(dev, "%s - data bits = 5\n", __func__); 895 break; 896 case CS6: 897 bits |= BITS_DATA_6; 898 dev_dbg(dev, "%s - data bits = 6\n", __func__); 899 break; 900 case CS7: 901 bits |= BITS_DATA_7; 902 dev_dbg(dev, "%s - data bits = 7\n", __func__); 903 break; 904 case CS8: 905 bits |= BITS_DATA_8; 906 dev_dbg(dev, "%s - data bits = 8\n", __func__); 907 break; 908 /*case CS9: 909 bits |= BITS_DATA_9; 910 dev_dbg(dev, "%s - data bits = 9\n", __func__); 911 break;*/ 912 default: 913 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 914 bits |= BITS_DATA_8; 915 break; 916 } 917 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 918 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 919 } 920 921 if ((cflag & (PARENB|PARODD|CMSPAR)) != 922 (old_cflag & (PARENB|PARODD|CMSPAR))) { 923 cp210x_get_line_ctl(port, &bits); 924 bits &= ~BITS_PARITY_MASK; 925 if (cflag & PARENB) { 926 if (cflag & CMSPAR) { 927 if (cflag & PARODD) { 928 bits |= BITS_PARITY_MARK; 929 dev_dbg(dev, "%s - parity = MARK\n", __func__); 930 } else { 931 bits |= BITS_PARITY_SPACE; 932 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 933 } 934 } else { 935 if (cflag & PARODD) { 936 bits |= BITS_PARITY_ODD; 937 dev_dbg(dev, "%s - parity = ODD\n", __func__); 938 } else { 939 bits |= BITS_PARITY_EVEN; 940 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 941 } 942 } 943 } 944 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 945 dev_dbg(dev, "Parity mode not supported by device\n"); 946 } 947 948 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 949 cp210x_get_line_ctl(port, &bits); 950 bits &= ~BITS_STOP_MASK; 951 if (cflag & CSTOPB) { 952 bits |= BITS_STOP_2; 953 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 954 } else { 955 bits |= BITS_STOP_1; 956 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 957 } 958 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 959 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 960 } 961 962 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 963 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 964 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 965 __func__, modem_ctl[0], modem_ctl[1], 966 modem_ctl[2], modem_ctl[3]); 967 968 if (cflag & CRTSCTS) { 969 modem_ctl[0] &= ~0x7B; 970 modem_ctl[0] |= 0x09; 971 modem_ctl[1] = 0x80; 972 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 973 } else { 974 modem_ctl[0] &= ~0x7B; 975 modem_ctl[0] |= 0x01; 976 modem_ctl[1] |= 0x40; 977 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 978 } 979 980 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 981 __func__, modem_ctl[0], modem_ctl[1], 982 modem_ctl[2], modem_ctl[3]); 983 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 984 } 985 986 } 987 988 static int cp210x_tiocmset(struct tty_struct *tty, 989 unsigned int set, unsigned int clear) 990 { 991 struct usb_serial_port *port = tty->driver_data; 992 return cp210x_tiocmset_port(port, set, clear); 993 } 994 995 static int cp210x_tiocmset_port(struct usb_serial_port *port, 996 unsigned int set, unsigned int clear) 997 { 998 u16 control = 0; 999 1000 if (set & TIOCM_RTS) { 1001 control |= CONTROL_RTS; 1002 control |= CONTROL_WRITE_RTS; 1003 } 1004 if (set & TIOCM_DTR) { 1005 control |= CONTROL_DTR; 1006 control |= CONTROL_WRITE_DTR; 1007 } 1008 if (clear & TIOCM_RTS) { 1009 control &= ~CONTROL_RTS; 1010 control |= CONTROL_WRITE_RTS; 1011 } 1012 if (clear & TIOCM_DTR) { 1013 control &= ~CONTROL_DTR; 1014 control |= CONTROL_WRITE_DTR; 1015 } 1016 1017 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1018 1019 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1020 } 1021 1022 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1023 { 1024 if (on) 1025 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1026 else 1027 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1028 } 1029 1030 static int cp210x_tiocmget(struct tty_struct *tty) 1031 { 1032 struct usb_serial_port *port = tty->driver_data; 1033 unsigned int control; 1034 int result; 1035 1036 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 1037 1038 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1039 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1040 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1041 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1042 |((control & CONTROL_RING)? TIOCM_RI : 0) 1043 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1044 1045 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1046 1047 return result; 1048 } 1049 1050 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1051 { 1052 struct usb_serial_port *port = tty->driver_data; 1053 u16 state; 1054 1055 if (break_state == 0) 1056 state = BREAK_OFF; 1057 else 1058 state = BREAK_ON; 1059 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1060 state == BREAK_OFF ? "off" : "on"); 1061 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1062 } 1063 1064 static int cp210x_port_probe(struct usb_serial_port *port) 1065 { 1066 struct usb_serial *serial = port->serial; 1067 struct usb_host_interface *cur_altsetting; 1068 struct cp210x_port_private *port_priv; 1069 int ret; 1070 1071 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1072 if (!port_priv) 1073 return -ENOMEM; 1074 1075 cur_altsetting = serial->interface->cur_altsetting; 1076 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1077 1078 usb_set_serial_port_data(port, port_priv); 1079 1080 ret = cp210x_detect_swapped_line_ctl(port); 1081 if (ret) { 1082 kfree(port_priv); 1083 return ret; 1084 } 1085 1086 return 0; 1087 } 1088 1089 static int cp210x_port_remove(struct usb_serial_port *port) 1090 { 1091 struct cp210x_port_private *port_priv; 1092 1093 port_priv = usb_get_serial_port_data(port); 1094 kfree(port_priv); 1095 1096 return 0; 1097 } 1098 1099 module_usb_serial_driver(serial_drivers, id_table); 1100 1101 MODULE_DESCRIPTION(DRIVER_DESC); 1102 MODULE_LICENSE("GPL"); 1103