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, 0x82F4) }, /* Starizona MicroTouch */ 113 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 114 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 115 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 116 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 117 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 118 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 119 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 120 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 121 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 122 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 123 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 124 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 125 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 126 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 127 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 128 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 129 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 130 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 131 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 132 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 133 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 134 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 135 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 136 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 137 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 138 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 139 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 140 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 141 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 142 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 143 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 144 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 145 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 146 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 147 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 148 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 149 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 150 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 151 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 152 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 153 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 154 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 155 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 156 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 157 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 158 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 159 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 160 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 161 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 162 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 163 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 164 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 165 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 166 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 167 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 168 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 169 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 170 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 171 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 172 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 173 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 174 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 175 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 176 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 177 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 178 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 179 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 180 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 181 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 182 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 183 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 184 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 185 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 186 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 187 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 188 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 189 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 190 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 191 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 192 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 193 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 194 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 195 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 196 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 197 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 198 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 199 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 200 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 201 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 202 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 203 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 204 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 205 { } /* Terminating Entry */ 206 }; 207 208 MODULE_DEVICE_TABLE(usb, id_table); 209 210 struct cp210x_port_private { 211 __u8 bInterfaceNumber; 212 bool has_swapped_line_ctl; 213 }; 214 215 static struct usb_serial_driver cp210x_device = { 216 .driver = { 217 .owner = THIS_MODULE, 218 .name = "cp210x", 219 }, 220 .id_table = id_table, 221 .num_ports = 1, 222 .bulk_in_size = 256, 223 .bulk_out_size = 256, 224 .open = cp210x_open, 225 .close = cp210x_close, 226 .break_ctl = cp210x_break_ctl, 227 .set_termios = cp210x_set_termios, 228 .tx_empty = cp210x_tx_empty, 229 .tiocmget = cp210x_tiocmget, 230 .tiocmset = cp210x_tiocmset, 231 .port_probe = cp210x_port_probe, 232 .port_remove = cp210x_port_remove, 233 .dtr_rts = cp210x_dtr_rts 234 }; 235 236 static struct usb_serial_driver * const serial_drivers[] = { 237 &cp210x_device, NULL 238 }; 239 240 /* Config request types */ 241 #define REQTYPE_HOST_TO_INTERFACE 0x41 242 #define REQTYPE_INTERFACE_TO_HOST 0xc1 243 #define REQTYPE_HOST_TO_DEVICE 0x40 244 #define REQTYPE_DEVICE_TO_HOST 0xc0 245 246 /* Config request codes */ 247 #define CP210X_IFC_ENABLE 0x00 248 #define CP210X_SET_BAUDDIV 0x01 249 #define CP210X_GET_BAUDDIV 0x02 250 #define CP210X_SET_LINE_CTL 0x03 251 #define CP210X_GET_LINE_CTL 0x04 252 #define CP210X_SET_BREAK 0x05 253 #define CP210X_IMM_CHAR 0x06 254 #define CP210X_SET_MHS 0x07 255 #define CP210X_GET_MDMSTS 0x08 256 #define CP210X_SET_XON 0x09 257 #define CP210X_SET_XOFF 0x0A 258 #define CP210X_SET_EVENTMASK 0x0B 259 #define CP210X_GET_EVENTMASK 0x0C 260 #define CP210X_SET_CHAR 0x0D 261 #define CP210X_GET_CHARS 0x0E 262 #define CP210X_GET_PROPS 0x0F 263 #define CP210X_GET_COMM_STATUS 0x10 264 #define CP210X_RESET 0x11 265 #define CP210X_PURGE 0x12 266 #define CP210X_SET_FLOW 0x13 267 #define CP210X_GET_FLOW 0x14 268 #define CP210X_EMBED_EVENTS 0x15 269 #define CP210X_GET_EVENTSTATE 0x16 270 #define CP210X_SET_CHARS 0x19 271 #define CP210X_GET_BAUDRATE 0x1D 272 #define CP210X_SET_BAUDRATE 0x1E 273 274 /* CP210X_IFC_ENABLE */ 275 #define UART_ENABLE 0x0001 276 #define UART_DISABLE 0x0000 277 278 /* CP210X_(SET|GET)_BAUDDIV */ 279 #define BAUD_RATE_GEN_FREQ 0x384000 280 281 /* CP210X_(SET|GET)_LINE_CTL */ 282 #define BITS_DATA_MASK 0X0f00 283 #define BITS_DATA_5 0X0500 284 #define BITS_DATA_6 0X0600 285 #define BITS_DATA_7 0X0700 286 #define BITS_DATA_8 0X0800 287 #define BITS_DATA_9 0X0900 288 289 #define BITS_PARITY_MASK 0x00f0 290 #define BITS_PARITY_NONE 0x0000 291 #define BITS_PARITY_ODD 0x0010 292 #define BITS_PARITY_EVEN 0x0020 293 #define BITS_PARITY_MARK 0x0030 294 #define BITS_PARITY_SPACE 0x0040 295 296 #define BITS_STOP_MASK 0x000f 297 #define BITS_STOP_1 0x0000 298 #define BITS_STOP_1_5 0x0001 299 #define BITS_STOP_2 0x0002 300 301 /* CP210X_SET_BREAK */ 302 #define BREAK_ON 0x0001 303 #define BREAK_OFF 0x0000 304 305 /* CP210X_(SET_MHS|GET_MDMSTS) */ 306 #define CONTROL_DTR 0x0001 307 #define CONTROL_RTS 0x0002 308 #define CONTROL_CTS 0x0010 309 #define CONTROL_DSR 0x0020 310 #define CONTROL_RING 0x0040 311 #define CONTROL_DCD 0x0080 312 #define CONTROL_WRITE_DTR 0x0100 313 #define CONTROL_WRITE_RTS 0x0200 314 315 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 316 struct cp210x_comm_status { 317 __le32 ulErrors; 318 __le32 ulHoldReasons; 319 __le32 ulAmountInInQueue; 320 __le32 ulAmountInOutQueue; 321 u8 bEofReceived; 322 u8 bWaitForImmediate; 323 u8 bReserved; 324 } __packed; 325 326 /* 327 * CP210X_PURGE - 16 bits passed in wValue of USB request. 328 * SiLabs app note AN571 gives a strange description of the 4 bits: 329 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 330 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 331 */ 332 #define PURGE_ALL 0x000f 333 334 /* 335 * Reads a variable-sized block of CP210X_ registers, identified by req. 336 * Returns data into buf in native USB byte order. 337 */ 338 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 339 void *buf, int bufsize) 340 { 341 struct usb_serial *serial = port->serial; 342 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 343 void *dmabuf; 344 int result; 345 346 dmabuf = kmalloc(bufsize, GFP_KERNEL); 347 if (!dmabuf) { 348 /* 349 * FIXME Some callers don't bother to check for error, 350 * at least give them consistent junk until they are fixed 351 */ 352 memset(buf, 0, bufsize); 353 return -ENOMEM; 354 } 355 356 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 357 req, REQTYPE_INTERFACE_TO_HOST, 0, 358 port_priv->bInterfaceNumber, dmabuf, bufsize, 359 USB_CTRL_SET_TIMEOUT); 360 if (result == bufsize) { 361 memcpy(buf, dmabuf, bufsize); 362 result = 0; 363 } else { 364 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 365 req, bufsize, result); 366 if (result >= 0) 367 result = -EPROTO; 368 369 /* 370 * FIXME Some callers don't bother to check for error, 371 * at least give them consistent junk until they are fixed 372 */ 373 memset(buf, 0, bufsize); 374 } 375 376 kfree(dmabuf); 377 378 return result; 379 } 380 381 /* 382 * Reads any 32-bit CP210X_ register identified by req. 383 */ 384 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 385 { 386 __le32 le32_val; 387 int err; 388 389 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 390 if (err) { 391 /* 392 * FIXME Some callers don't bother to check for error, 393 * at least give them consistent junk until they are fixed 394 */ 395 *val = 0; 396 return err; 397 } 398 399 *val = le32_to_cpu(le32_val); 400 401 return 0; 402 } 403 404 /* 405 * Reads any 16-bit CP210X_ register identified by req. 406 */ 407 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 408 { 409 __le16 le16_val; 410 int err; 411 412 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 413 if (err) 414 return err; 415 416 *val = le16_to_cpu(le16_val); 417 418 return 0; 419 } 420 421 /* 422 * Reads any 8-bit CP210X_ register identified by req. 423 */ 424 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 425 { 426 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 427 } 428 429 /* 430 * Writes any 16-bit CP210X_ register (req) whose value is passed 431 * entirely in the wValue field of the USB request. 432 */ 433 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 434 { 435 struct usb_serial *serial = port->serial; 436 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 437 int result; 438 439 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 440 req, REQTYPE_HOST_TO_INTERFACE, val, 441 port_priv->bInterfaceNumber, NULL, 0, 442 USB_CTRL_SET_TIMEOUT); 443 if (result < 0) { 444 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 445 req, result); 446 } 447 448 return result; 449 } 450 451 /* 452 * Writes a variable-sized block of CP210X_ registers, identified by req. 453 * Data in buf must be in native USB byte order. 454 */ 455 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 456 void *buf, int bufsize) 457 { 458 struct usb_serial *serial = port->serial; 459 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 460 void *dmabuf; 461 int result; 462 463 dmabuf = kmalloc(bufsize, GFP_KERNEL); 464 if (!dmabuf) 465 return -ENOMEM; 466 467 memcpy(dmabuf, buf, bufsize); 468 469 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 470 req, REQTYPE_HOST_TO_INTERFACE, 0, 471 port_priv->bInterfaceNumber, dmabuf, bufsize, 472 USB_CTRL_SET_TIMEOUT); 473 474 kfree(dmabuf); 475 476 if (result == bufsize) { 477 result = 0; 478 } else { 479 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 480 req, bufsize, result); 481 if (result >= 0) 482 result = -EPROTO; 483 } 484 485 return result; 486 } 487 488 /* 489 * Writes any 32-bit CP210X_ register identified by req. 490 */ 491 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 492 { 493 __le32 le32_val; 494 495 le32_val = cpu_to_le32(val); 496 497 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 498 } 499 500 /* 501 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 502 * Write a known good value 0x800, read it back. 503 * If it comes back swapped the bug is detected. 504 * Preserve the original register value. 505 */ 506 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 507 { 508 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 509 u16 line_ctl_save; 510 u16 line_ctl_test; 511 int err; 512 513 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 514 if (err) 515 return err; 516 517 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 518 if (err) 519 return err; 520 521 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 522 if (err) 523 return err; 524 525 if (line_ctl_test == 8) { 526 port_priv->has_swapped_line_ctl = true; 527 line_ctl_save = swab16(line_ctl_save); 528 } 529 530 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 531 } 532 533 /* 534 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 535 * to workaround cp2108 bug and get correct value. 536 */ 537 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 538 { 539 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 540 int err; 541 542 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 543 if (err) 544 return err; 545 546 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 547 if (port_priv->has_swapped_line_ctl) 548 *ctl = swab16(*ctl); 549 550 return 0; 551 } 552 553 /* 554 * cp210x_quantise_baudrate 555 * Quantises the baud rate as per AN205 Table 1 556 */ 557 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 558 { 559 if (baud <= 300) 560 baud = 300; 561 else if (baud <= 600) baud = 600; 562 else if (baud <= 1200) baud = 1200; 563 else if (baud <= 1800) baud = 1800; 564 else if (baud <= 2400) baud = 2400; 565 else if (baud <= 4000) baud = 4000; 566 else if (baud <= 4803) baud = 4800; 567 else if (baud <= 7207) baud = 7200; 568 else if (baud <= 9612) baud = 9600; 569 else if (baud <= 14428) baud = 14400; 570 else if (baud <= 16062) baud = 16000; 571 else if (baud <= 19250) baud = 19200; 572 else if (baud <= 28912) baud = 28800; 573 else if (baud <= 38601) baud = 38400; 574 else if (baud <= 51558) baud = 51200; 575 else if (baud <= 56280) baud = 56000; 576 else if (baud <= 58053) baud = 57600; 577 else if (baud <= 64111) baud = 64000; 578 else if (baud <= 77608) baud = 76800; 579 else if (baud <= 117028) baud = 115200; 580 else if (baud <= 129347) baud = 128000; 581 else if (baud <= 156868) baud = 153600; 582 else if (baud <= 237832) baud = 230400; 583 else if (baud <= 254234) baud = 250000; 584 else if (baud <= 273066) baud = 256000; 585 else if (baud <= 491520) baud = 460800; 586 else if (baud <= 567138) baud = 500000; 587 else if (baud <= 670254) baud = 576000; 588 else if (baud < 1000000) 589 baud = 921600; 590 else if (baud > 2000000) 591 baud = 2000000; 592 return baud; 593 } 594 595 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 596 { 597 int result; 598 599 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 600 if (result) { 601 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 602 return result; 603 } 604 605 /* Configure the termios structure */ 606 cp210x_get_termios(tty, port); 607 608 /* The baud rate must be initialised on cp2104 */ 609 if (tty) 610 cp210x_change_speed(tty, port, NULL); 611 612 return usb_serial_generic_open(tty, port); 613 } 614 615 static void cp210x_close(struct usb_serial_port *port) 616 { 617 usb_serial_generic_close(port); 618 619 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 620 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 621 622 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 623 } 624 625 /* 626 * Read how many bytes are waiting in the TX queue. 627 */ 628 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 629 u32 *count) 630 { 631 struct usb_serial *serial = port->serial; 632 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 633 struct cp210x_comm_status *sts; 634 int result; 635 636 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 637 if (!sts) 638 return -ENOMEM; 639 640 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 641 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 642 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 643 USB_CTRL_GET_TIMEOUT); 644 if (result == sizeof(*sts)) { 645 *count = le32_to_cpu(sts->ulAmountInOutQueue); 646 result = 0; 647 } else { 648 dev_err(&port->dev, "failed to get comm status: %d\n", result); 649 if (result >= 0) 650 result = -EPROTO; 651 } 652 653 kfree(sts); 654 655 return result; 656 } 657 658 static bool cp210x_tx_empty(struct usb_serial_port *port) 659 { 660 int err; 661 u32 count; 662 663 err = cp210x_get_tx_queue_byte_count(port, &count); 664 if (err) 665 return true; 666 667 return !count; 668 } 669 670 /* 671 * cp210x_get_termios 672 * Reads the baud rate, data bits, parity, stop bits and flow control mode 673 * from the device, corrects any unsupported values, and configures the 674 * termios structure to reflect the state of the device 675 */ 676 static void cp210x_get_termios(struct tty_struct *tty, 677 struct usb_serial_port *port) 678 { 679 unsigned int baud; 680 681 if (tty) { 682 cp210x_get_termios_port(tty->driver_data, 683 &tty->termios.c_cflag, &baud); 684 tty_encode_baud_rate(tty, baud, baud); 685 } else { 686 unsigned int cflag; 687 cflag = 0; 688 cp210x_get_termios_port(port, &cflag, &baud); 689 } 690 } 691 692 /* 693 * cp210x_get_termios_port 694 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 695 */ 696 static void cp210x_get_termios_port(struct usb_serial_port *port, 697 unsigned int *cflagp, unsigned int *baudp) 698 { 699 struct device *dev = &port->dev; 700 unsigned int cflag; 701 u8 modem_ctl[16]; 702 u32 baud; 703 u16 bits; 704 705 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 706 707 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 708 *baudp = baud; 709 710 cflag = *cflagp; 711 712 cp210x_get_line_ctl(port, &bits); 713 cflag &= ~CSIZE; 714 switch (bits & BITS_DATA_MASK) { 715 case BITS_DATA_5: 716 dev_dbg(dev, "%s - data bits = 5\n", __func__); 717 cflag |= CS5; 718 break; 719 case BITS_DATA_6: 720 dev_dbg(dev, "%s - data bits = 6\n", __func__); 721 cflag |= CS6; 722 break; 723 case BITS_DATA_7: 724 dev_dbg(dev, "%s - data bits = 7\n", __func__); 725 cflag |= CS7; 726 break; 727 case BITS_DATA_8: 728 dev_dbg(dev, "%s - data bits = 8\n", __func__); 729 cflag |= CS8; 730 break; 731 case BITS_DATA_9: 732 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 733 cflag |= CS8; 734 bits &= ~BITS_DATA_MASK; 735 bits |= BITS_DATA_8; 736 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 737 break; 738 default: 739 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 740 cflag |= CS8; 741 bits &= ~BITS_DATA_MASK; 742 bits |= BITS_DATA_8; 743 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 744 break; 745 } 746 747 switch (bits & BITS_PARITY_MASK) { 748 case BITS_PARITY_NONE: 749 dev_dbg(dev, "%s - parity = NONE\n", __func__); 750 cflag &= ~PARENB; 751 break; 752 case BITS_PARITY_ODD: 753 dev_dbg(dev, "%s - parity = ODD\n", __func__); 754 cflag |= (PARENB|PARODD); 755 break; 756 case BITS_PARITY_EVEN: 757 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 758 cflag &= ~PARODD; 759 cflag |= PARENB; 760 break; 761 case BITS_PARITY_MARK: 762 dev_dbg(dev, "%s - parity = MARK\n", __func__); 763 cflag |= (PARENB|PARODD|CMSPAR); 764 break; 765 case BITS_PARITY_SPACE: 766 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 767 cflag &= ~PARODD; 768 cflag |= (PARENB|CMSPAR); 769 break; 770 default: 771 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 772 cflag &= ~PARENB; 773 bits &= ~BITS_PARITY_MASK; 774 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 775 break; 776 } 777 778 cflag &= ~CSTOPB; 779 switch (bits & BITS_STOP_MASK) { 780 case BITS_STOP_1: 781 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 782 break; 783 case BITS_STOP_1_5: 784 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 785 bits &= ~BITS_STOP_MASK; 786 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 787 break; 788 case BITS_STOP_2: 789 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 790 cflag |= CSTOPB; 791 break; 792 default: 793 dev_dbg(dev, "%s - Unknown number of stop bits, 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 } 798 799 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl, 800 sizeof(modem_ctl)); 801 if (modem_ctl[0] & 0x08) { 802 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 803 cflag |= CRTSCTS; 804 } else { 805 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 806 cflag &= ~CRTSCTS; 807 } 808 809 *cflagp = cflag; 810 } 811 812 /* 813 * CP2101 supports the following baud rates: 814 * 815 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 816 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 817 * 818 * CP2102 and CP2103 support the following additional rates: 819 * 820 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 821 * 576000 822 * 823 * The device will map a requested rate to a supported one, but the result 824 * of requests for rates greater than 1053257 is undefined (see AN205). 825 * 826 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 827 * respectively, with an error less than 1%. The actual rates are determined 828 * by 829 * 830 * div = round(freq / (2 x prescale x request)) 831 * actual = freq / (2 x prescale x div) 832 * 833 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 834 * or 1 otherwise. 835 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 836 * otherwise. 837 */ 838 static void cp210x_change_speed(struct tty_struct *tty, 839 struct usb_serial_port *port, struct ktermios *old_termios) 840 { 841 u32 baud; 842 843 baud = tty->termios.c_ospeed; 844 845 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 846 * or to an arbitrary rate in [1M,2M]. 847 * 848 * NOTE: B0 is not implemented. 849 */ 850 baud = cp210x_quantise_baudrate(baud); 851 852 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 853 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 854 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 855 if (old_termios) 856 baud = old_termios->c_ospeed; 857 else 858 baud = 9600; 859 } 860 861 tty_encode_baud_rate(tty, baud, baud); 862 } 863 864 static void cp210x_set_termios(struct tty_struct *tty, 865 struct usb_serial_port *port, struct ktermios *old_termios) 866 { 867 struct device *dev = &port->dev; 868 unsigned int cflag, old_cflag; 869 u16 bits; 870 u8 modem_ctl[16]; 871 872 cflag = tty->termios.c_cflag; 873 old_cflag = old_termios->c_cflag; 874 875 if (tty->termios.c_ospeed != old_termios->c_ospeed) 876 cp210x_change_speed(tty, port, old_termios); 877 878 /* If the number of data bits is to be updated */ 879 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 880 cp210x_get_line_ctl(port, &bits); 881 bits &= ~BITS_DATA_MASK; 882 switch (cflag & CSIZE) { 883 case CS5: 884 bits |= BITS_DATA_5; 885 dev_dbg(dev, "%s - data bits = 5\n", __func__); 886 break; 887 case CS6: 888 bits |= BITS_DATA_6; 889 dev_dbg(dev, "%s - data bits = 6\n", __func__); 890 break; 891 case CS7: 892 bits |= BITS_DATA_7; 893 dev_dbg(dev, "%s - data bits = 7\n", __func__); 894 break; 895 case CS8: 896 bits |= BITS_DATA_8; 897 dev_dbg(dev, "%s - data bits = 8\n", __func__); 898 break; 899 /*case CS9: 900 bits |= BITS_DATA_9; 901 dev_dbg(dev, "%s - data bits = 9\n", __func__); 902 break;*/ 903 default: 904 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 905 bits |= BITS_DATA_8; 906 break; 907 } 908 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 909 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 910 } 911 912 if ((cflag & (PARENB|PARODD|CMSPAR)) != 913 (old_cflag & (PARENB|PARODD|CMSPAR))) { 914 cp210x_get_line_ctl(port, &bits); 915 bits &= ~BITS_PARITY_MASK; 916 if (cflag & PARENB) { 917 if (cflag & CMSPAR) { 918 if (cflag & PARODD) { 919 bits |= BITS_PARITY_MARK; 920 dev_dbg(dev, "%s - parity = MARK\n", __func__); 921 } else { 922 bits |= BITS_PARITY_SPACE; 923 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 924 } 925 } else { 926 if (cflag & PARODD) { 927 bits |= BITS_PARITY_ODD; 928 dev_dbg(dev, "%s - parity = ODD\n", __func__); 929 } else { 930 bits |= BITS_PARITY_EVEN; 931 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 932 } 933 } 934 } 935 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 936 dev_dbg(dev, "Parity mode not supported by device\n"); 937 } 938 939 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 940 cp210x_get_line_ctl(port, &bits); 941 bits &= ~BITS_STOP_MASK; 942 if (cflag & CSTOPB) { 943 bits |= BITS_STOP_2; 944 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 945 } else { 946 bits |= BITS_STOP_1; 947 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 948 } 949 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 950 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 951 } 952 953 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 954 955 /* Only bytes 0, 4 and 7 out of first 8 have functional bits */ 956 957 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl, 958 sizeof(modem_ctl)); 959 dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n", 960 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]); 961 962 if (cflag & CRTSCTS) { 963 modem_ctl[0] &= ~0x7B; 964 modem_ctl[0] |= 0x09; 965 modem_ctl[4] = 0x80; 966 /* FIXME - why clear reserved bits just read? */ 967 modem_ctl[5] = 0; 968 modem_ctl[6] = 0; 969 modem_ctl[7] = 0; 970 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 971 } else { 972 modem_ctl[0] &= ~0x7B; 973 modem_ctl[0] |= 0x01; 974 /* FIXME - OR here instead of assignment looks wrong */ 975 modem_ctl[4] |= 0x40; 976 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 977 } 978 979 dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n", 980 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]); 981 cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl, 982 sizeof(modem_ctl)); 983 } 984 985 } 986 987 static int cp210x_tiocmset(struct tty_struct *tty, 988 unsigned int set, unsigned int clear) 989 { 990 struct usb_serial_port *port = tty->driver_data; 991 return cp210x_tiocmset_port(port, set, clear); 992 } 993 994 static int cp210x_tiocmset_port(struct usb_serial_port *port, 995 unsigned int set, unsigned int clear) 996 { 997 u16 control = 0; 998 999 if (set & TIOCM_RTS) { 1000 control |= CONTROL_RTS; 1001 control |= CONTROL_WRITE_RTS; 1002 } 1003 if (set & TIOCM_DTR) { 1004 control |= CONTROL_DTR; 1005 control |= CONTROL_WRITE_DTR; 1006 } 1007 if (clear & TIOCM_RTS) { 1008 control &= ~CONTROL_RTS; 1009 control |= CONTROL_WRITE_RTS; 1010 } 1011 if (clear & TIOCM_DTR) { 1012 control &= ~CONTROL_DTR; 1013 control |= CONTROL_WRITE_DTR; 1014 } 1015 1016 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1017 1018 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1019 } 1020 1021 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1022 { 1023 if (on) 1024 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1025 else 1026 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1027 } 1028 1029 static int cp210x_tiocmget(struct tty_struct *tty) 1030 { 1031 struct usb_serial_port *port = tty->driver_data; 1032 u8 control; 1033 int result; 1034 1035 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1036 1037 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1038 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1039 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1040 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1041 |((control & CONTROL_RING)? TIOCM_RI : 0) 1042 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1043 1044 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1045 1046 return result; 1047 } 1048 1049 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1050 { 1051 struct usb_serial_port *port = tty->driver_data; 1052 u16 state; 1053 1054 if (break_state == 0) 1055 state = BREAK_OFF; 1056 else 1057 state = BREAK_ON; 1058 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1059 state == BREAK_OFF ? "off" : "on"); 1060 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1061 } 1062 1063 static int cp210x_port_probe(struct usb_serial_port *port) 1064 { 1065 struct usb_serial *serial = port->serial; 1066 struct usb_host_interface *cur_altsetting; 1067 struct cp210x_port_private *port_priv; 1068 int ret; 1069 1070 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1071 if (!port_priv) 1072 return -ENOMEM; 1073 1074 cur_altsetting = serial->interface->cur_altsetting; 1075 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1076 1077 usb_set_serial_port_data(port, port_priv); 1078 1079 ret = cp210x_detect_swapped_line_ctl(port); 1080 if (ret) { 1081 kfree(port_priv); 1082 return ret; 1083 } 1084 1085 return 0; 1086 } 1087 1088 static int cp210x_port_remove(struct usb_serial_port *port) 1089 { 1090 struct cp210x_port_private *port_priv; 1091 1092 port_priv = usb_get_serial_port_data(port); 1093 kfree(port_priv); 1094 1095 return 0; 1096 } 1097 1098 module_usb_serial_driver(serial_drivers, id_table); 1099 1100 MODULE_DESCRIPTION(DRIVER_DESC); 1101 MODULE_LICENSE("GPL"); 1102