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(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 167 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 168 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 169 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 170 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 171 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 172 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 173 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 174 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 175 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 176 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 177 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 178 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 179 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 180 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 181 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 182 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 183 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 184 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 185 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 186 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 187 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 188 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 189 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 190 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 191 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 192 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 193 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 194 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 195 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 196 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 197 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 198 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 199 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 200 { } /* Terminating Entry */ 201 }; 202 203 MODULE_DEVICE_TABLE(usb, id_table); 204 205 struct cp210x_port_private { 206 __u8 bInterfaceNumber; 207 bool has_swapped_line_ctl; 208 }; 209 210 static struct usb_serial_driver cp210x_device = { 211 .driver = { 212 .owner = THIS_MODULE, 213 .name = "cp210x", 214 }, 215 .id_table = id_table, 216 .num_ports = 1, 217 .bulk_in_size = 256, 218 .bulk_out_size = 256, 219 .open = cp210x_open, 220 .close = cp210x_close, 221 .break_ctl = cp210x_break_ctl, 222 .set_termios = cp210x_set_termios, 223 .tx_empty = cp210x_tx_empty, 224 .tiocmget = cp210x_tiocmget, 225 .tiocmset = cp210x_tiocmset, 226 .port_probe = cp210x_port_probe, 227 .port_remove = cp210x_port_remove, 228 .dtr_rts = cp210x_dtr_rts 229 }; 230 231 static struct usb_serial_driver * const serial_drivers[] = { 232 &cp210x_device, NULL 233 }; 234 235 /* Config request types */ 236 #define REQTYPE_HOST_TO_INTERFACE 0x41 237 #define REQTYPE_INTERFACE_TO_HOST 0xc1 238 #define REQTYPE_HOST_TO_DEVICE 0x40 239 #define REQTYPE_DEVICE_TO_HOST 0xc0 240 241 /* Config request codes */ 242 #define CP210X_IFC_ENABLE 0x00 243 #define CP210X_SET_BAUDDIV 0x01 244 #define CP210X_GET_BAUDDIV 0x02 245 #define CP210X_SET_LINE_CTL 0x03 246 #define CP210X_GET_LINE_CTL 0x04 247 #define CP210X_SET_BREAK 0x05 248 #define CP210X_IMM_CHAR 0x06 249 #define CP210X_SET_MHS 0x07 250 #define CP210X_GET_MDMSTS 0x08 251 #define CP210X_SET_XON 0x09 252 #define CP210X_SET_XOFF 0x0A 253 #define CP210X_SET_EVENTMASK 0x0B 254 #define CP210X_GET_EVENTMASK 0x0C 255 #define CP210X_SET_CHAR 0x0D 256 #define CP210X_GET_CHARS 0x0E 257 #define CP210X_GET_PROPS 0x0F 258 #define CP210X_GET_COMM_STATUS 0x10 259 #define CP210X_RESET 0x11 260 #define CP210X_PURGE 0x12 261 #define CP210X_SET_FLOW 0x13 262 #define CP210X_GET_FLOW 0x14 263 #define CP210X_EMBED_EVENTS 0x15 264 #define CP210X_GET_EVENTSTATE 0x16 265 #define CP210X_SET_CHARS 0x19 266 #define CP210X_GET_BAUDRATE 0x1D 267 #define CP210X_SET_BAUDRATE 0x1E 268 269 /* CP210X_IFC_ENABLE */ 270 #define UART_ENABLE 0x0001 271 #define UART_DISABLE 0x0000 272 273 /* CP210X_(SET|GET)_BAUDDIV */ 274 #define BAUD_RATE_GEN_FREQ 0x384000 275 276 /* CP210X_(SET|GET)_LINE_CTL */ 277 #define BITS_DATA_MASK 0X0f00 278 #define BITS_DATA_5 0X0500 279 #define BITS_DATA_6 0X0600 280 #define BITS_DATA_7 0X0700 281 #define BITS_DATA_8 0X0800 282 #define BITS_DATA_9 0X0900 283 284 #define BITS_PARITY_MASK 0x00f0 285 #define BITS_PARITY_NONE 0x0000 286 #define BITS_PARITY_ODD 0x0010 287 #define BITS_PARITY_EVEN 0x0020 288 #define BITS_PARITY_MARK 0x0030 289 #define BITS_PARITY_SPACE 0x0040 290 291 #define BITS_STOP_MASK 0x000f 292 #define BITS_STOP_1 0x0000 293 #define BITS_STOP_1_5 0x0001 294 #define BITS_STOP_2 0x0002 295 296 /* CP210X_SET_BREAK */ 297 #define BREAK_ON 0x0001 298 #define BREAK_OFF 0x0000 299 300 /* CP210X_(SET_MHS|GET_MDMSTS) */ 301 #define CONTROL_DTR 0x0001 302 #define CONTROL_RTS 0x0002 303 #define CONTROL_CTS 0x0010 304 #define CONTROL_DSR 0x0020 305 #define CONTROL_RING 0x0040 306 #define CONTROL_DCD 0x0080 307 #define CONTROL_WRITE_DTR 0x0100 308 #define CONTROL_WRITE_RTS 0x0200 309 310 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 311 struct cp210x_comm_status { 312 __le32 ulErrors; 313 __le32 ulHoldReasons; 314 __le32 ulAmountInInQueue; 315 __le32 ulAmountInOutQueue; 316 u8 bEofReceived; 317 u8 bWaitForImmediate; 318 u8 bReserved; 319 } __packed; 320 321 /* 322 * CP210X_PURGE - 16 bits passed in wValue of USB request. 323 * SiLabs app note AN571 gives a strange description of the 4 bits: 324 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 325 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 326 */ 327 #define PURGE_ALL 0x000f 328 329 /* 330 * Reads a variable-sized block of CP210X_ registers, identified by req. 331 * Returns data into buf in native USB byte order. 332 */ 333 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 334 void *buf, int bufsize) 335 { 336 struct usb_serial *serial = port->serial; 337 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 338 void *dmabuf; 339 int result; 340 341 dmabuf = kmalloc(bufsize, GFP_KERNEL); 342 if (!dmabuf) { 343 /* 344 * FIXME Some callers don't bother to check for error, 345 * at least give them consistent junk until they are fixed 346 */ 347 memset(buf, 0, bufsize); 348 return -ENOMEM; 349 } 350 351 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 352 req, REQTYPE_INTERFACE_TO_HOST, 0, 353 port_priv->bInterfaceNumber, dmabuf, bufsize, 354 USB_CTRL_SET_TIMEOUT); 355 if (result == bufsize) { 356 memcpy(buf, dmabuf, bufsize); 357 result = 0; 358 } else { 359 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 360 req, bufsize, result); 361 if (result >= 0) 362 result = -EPROTO; 363 364 /* 365 * FIXME Some callers don't bother to check for error, 366 * at least give them consistent junk until they are fixed 367 */ 368 memset(buf, 0, bufsize); 369 } 370 371 kfree(dmabuf); 372 373 return result; 374 } 375 376 /* 377 * Reads any 32-bit CP210X_ register identified by req. 378 */ 379 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 380 { 381 __le32 le32_val; 382 int err; 383 384 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 385 if (err) { 386 /* 387 * FIXME Some callers don't bother to check for error, 388 * at least give them consistent junk until they are fixed 389 */ 390 *val = 0; 391 return err; 392 } 393 394 *val = le32_to_cpu(le32_val); 395 396 return 0; 397 } 398 399 /* 400 * Reads any 16-bit CP210X_ register identified by req. 401 */ 402 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 403 { 404 __le16 le16_val; 405 int err; 406 407 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 408 if (err) 409 return err; 410 411 *val = le16_to_cpu(le16_val); 412 413 return 0; 414 } 415 416 /* 417 * Reads any 8-bit CP210X_ register identified by req. 418 */ 419 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 420 { 421 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 422 } 423 424 /* 425 * Writes any 16-bit CP210X_ register (req) whose value is passed 426 * entirely in the wValue field of the USB request. 427 */ 428 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 429 { 430 struct usb_serial *serial = port->serial; 431 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 432 int result; 433 434 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 435 req, REQTYPE_HOST_TO_INTERFACE, val, 436 port_priv->bInterfaceNumber, NULL, 0, 437 USB_CTRL_SET_TIMEOUT); 438 if (result < 0) { 439 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 440 req, result); 441 } 442 443 return result; 444 } 445 446 /* 447 * Writes a variable-sized block of CP210X_ registers, identified by req. 448 * Data in buf must be in native USB byte order. 449 */ 450 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 451 void *buf, int bufsize) 452 { 453 struct usb_serial *serial = port->serial; 454 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 455 void *dmabuf; 456 int result; 457 458 dmabuf = kmalloc(bufsize, GFP_KERNEL); 459 if (!dmabuf) 460 return -ENOMEM; 461 462 memcpy(dmabuf, buf, bufsize); 463 464 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 465 req, REQTYPE_HOST_TO_INTERFACE, 0, 466 port_priv->bInterfaceNumber, dmabuf, bufsize, 467 USB_CTRL_SET_TIMEOUT); 468 469 kfree(dmabuf); 470 471 if (result == bufsize) { 472 result = 0; 473 } else { 474 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 475 req, bufsize, result); 476 if (result >= 0) 477 result = -EPROTO; 478 } 479 480 return result; 481 } 482 483 /* 484 * Writes any 32-bit CP210X_ register identified by req. 485 */ 486 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 487 { 488 __le32 le32_val; 489 490 le32_val = cpu_to_le32(val); 491 492 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 493 } 494 495 /* 496 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 497 * Write a known good value 0x800, read it back. 498 * If it comes back swapped the bug is detected. 499 * Preserve the original register value. 500 */ 501 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 502 { 503 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 504 u16 line_ctl_save; 505 u16 line_ctl_test; 506 int err; 507 508 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 509 if (err) 510 return err; 511 512 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 513 if (err) 514 return err; 515 516 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 517 if (err) 518 return err; 519 520 if (line_ctl_test == 8) { 521 port_priv->has_swapped_line_ctl = true; 522 line_ctl_save = swab16(line_ctl_save); 523 } 524 525 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 526 } 527 528 /* 529 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 530 * to workaround cp2108 bug and get correct value. 531 */ 532 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 533 { 534 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 535 int err; 536 537 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 538 if (err) 539 return err; 540 541 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 542 if (port_priv->has_swapped_line_ctl) 543 *ctl = swab16(*ctl); 544 545 return 0; 546 } 547 548 /* 549 * cp210x_quantise_baudrate 550 * Quantises the baud rate as per AN205 Table 1 551 */ 552 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 553 { 554 if (baud <= 300) 555 baud = 300; 556 else if (baud <= 600) baud = 600; 557 else if (baud <= 1200) baud = 1200; 558 else if (baud <= 1800) baud = 1800; 559 else if (baud <= 2400) baud = 2400; 560 else if (baud <= 4000) baud = 4000; 561 else if (baud <= 4803) baud = 4800; 562 else if (baud <= 7207) baud = 7200; 563 else if (baud <= 9612) baud = 9600; 564 else if (baud <= 14428) baud = 14400; 565 else if (baud <= 16062) baud = 16000; 566 else if (baud <= 19250) baud = 19200; 567 else if (baud <= 28912) baud = 28800; 568 else if (baud <= 38601) baud = 38400; 569 else if (baud <= 51558) baud = 51200; 570 else if (baud <= 56280) baud = 56000; 571 else if (baud <= 58053) baud = 57600; 572 else if (baud <= 64111) baud = 64000; 573 else if (baud <= 77608) baud = 76800; 574 else if (baud <= 117028) baud = 115200; 575 else if (baud <= 129347) baud = 128000; 576 else if (baud <= 156868) baud = 153600; 577 else if (baud <= 237832) baud = 230400; 578 else if (baud <= 254234) baud = 250000; 579 else if (baud <= 273066) baud = 256000; 580 else if (baud <= 491520) baud = 460800; 581 else if (baud <= 567138) baud = 500000; 582 else if (baud <= 670254) baud = 576000; 583 else if (baud < 1000000) 584 baud = 921600; 585 else if (baud > 2000000) 586 baud = 2000000; 587 return baud; 588 } 589 590 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 591 { 592 int result; 593 594 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 595 if (result) { 596 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 597 return result; 598 } 599 600 /* Configure the termios structure */ 601 cp210x_get_termios(tty, port); 602 603 /* The baud rate must be initialised on cp2104 */ 604 if (tty) 605 cp210x_change_speed(tty, port, NULL); 606 607 return usb_serial_generic_open(tty, port); 608 } 609 610 static void cp210x_close(struct usb_serial_port *port) 611 { 612 usb_serial_generic_close(port); 613 614 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 615 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 616 617 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 618 } 619 620 /* 621 * Read how many bytes are waiting in the TX queue. 622 */ 623 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 624 u32 *count) 625 { 626 struct usb_serial *serial = port->serial; 627 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 628 struct cp210x_comm_status *sts; 629 int result; 630 631 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 632 if (!sts) 633 return -ENOMEM; 634 635 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 636 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 637 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 638 USB_CTRL_GET_TIMEOUT); 639 if (result == sizeof(*sts)) { 640 *count = le32_to_cpu(sts->ulAmountInOutQueue); 641 result = 0; 642 } else { 643 dev_err(&port->dev, "failed to get comm status: %d\n", result); 644 if (result >= 0) 645 result = -EPROTO; 646 } 647 648 kfree(sts); 649 650 return result; 651 } 652 653 static bool cp210x_tx_empty(struct usb_serial_port *port) 654 { 655 int err; 656 u32 count; 657 658 err = cp210x_get_tx_queue_byte_count(port, &count); 659 if (err) 660 return true; 661 662 return !count; 663 } 664 665 /* 666 * cp210x_get_termios 667 * Reads the baud rate, data bits, parity, stop bits and flow control mode 668 * from the device, corrects any unsupported values, and configures the 669 * termios structure to reflect the state of the device 670 */ 671 static void cp210x_get_termios(struct tty_struct *tty, 672 struct usb_serial_port *port) 673 { 674 unsigned int baud; 675 676 if (tty) { 677 cp210x_get_termios_port(tty->driver_data, 678 &tty->termios.c_cflag, &baud); 679 tty_encode_baud_rate(tty, baud, baud); 680 } else { 681 unsigned int cflag; 682 cflag = 0; 683 cp210x_get_termios_port(port, &cflag, &baud); 684 } 685 } 686 687 /* 688 * cp210x_get_termios_port 689 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 690 */ 691 static void cp210x_get_termios_port(struct usb_serial_port *port, 692 unsigned int *cflagp, unsigned int *baudp) 693 { 694 struct device *dev = &port->dev; 695 unsigned int cflag; 696 u8 modem_ctl[16]; 697 u32 baud; 698 u16 bits; 699 700 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 701 702 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 703 *baudp = baud; 704 705 cflag = *cflagp; 706 707 cp210x_get_line_ctl(port, &bits); 708 cflag &= ~CSIZE; 709 switch (bits & BITS_DATA_MASK) { 710 case BITS_DATA_5: 711 dev_dbg(dev, "%s - data bits = 5\n", __func__); 712 cflag |= CS5; 713 break; 714 case BITS_DATA_6: 715 dev_dbg(dev, "%s - data bits = 6\n", __func__); 716 cflag |= CS6; 717 break; 718 case BITS_DATA_7: 719 dev_dbg(dev, "%s - data bits = 7\n", __func__); 720 cflag |= CS7; 721 break; 722 case BITS_DATA_8: 723 dev_dbg(dev, "%s - data bits = 8\n", __func__); 724 cflag |= CS8; 725 break; 726 case BITS_DATA_9: 727 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 728 cflag |= CS8; 729 bits &= ~BITS_DATA_MASK; 730 bits |= BITS_DATA_8; 731 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 732 break; 733 default: 734 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 735 cflag |= CS8; 736 bits &= ~BITS_DATA_MASK; 737 bits |= BITS_DATA_8; 738 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 739 break; 740 } 741 742 switch (bits & BITS_PARITY_MASK) { 743 case BITS_PARITY_NONE: 744 dev_dbg(dev, "%s - parity = NONE\n", __func__); 745 cflag &= ~PARENB; 746 break; 747 case BITS_PARITY_ODD: 748 dev_dbg(dev, "%s - parity = ODD\n", __func__); 749 cflag |= (PARENB|PARODD); 750 break; 751 case BITS_PARITY_EVEN: 752 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 753 cflag &= ~PARODD; 754 cflag |= PARENB; 755 break; 756 case BITS_PARITY_MARK: 757 dev_dbg(dev, "%s - parity = MARK\n", __func__); 758 cflag |= (PARENB|PARODD|CMSPAR); 759 break; 760 case BITS_PARITY_SPACE: 761 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 762 cflag &= ~PARODD; 763 cflag |= (PARENB|CMSPAR); 764 break; 765 default: 766 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 767 cflag &= ~PARENB; 768 bits &= ~BITS_PARITY_MASK; 769 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 770 break; 771 } 772 773 cflag &= ~CSTOPB; 774 switch (bits & BITS_STOP_MASK) { 775 case BITS_STOP_1: 776 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 777 break; 778 case BITS_STOP_1_5: 779 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 780 bits &= ~BITS_STOP_MASK; 781 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 782 break; 783 case BITS_STOP_2: 784 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 785 cflag |= CSTOPB; 786 break; 787 default: 788 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 789 bits &= ~BITS_STOP_MASK; 790 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 791 break; 792 } 793 794 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl, 795 sizeof(modem_ctl)); 796 if (modem_ctl[0] & 0x08) { 797 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 798 cflag |= CRTSCTS; 799 } else { 800 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 801 cflag &= ~CRTSCTS; 802 } 803 804 *cflagp = cflag; 805 } 806 807 /* 808 * CP2101 supports the following baud rates: 809 * 810 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 811 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 812 * 813 * CP2102 and CP2103 support the following additional rates: 814 * 815 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 816 * 576000 817 * 818 * The device will map a requested rate to a supported one, but the result 819 * of requests for rates greater than 1053257 is undefined (see AN205). 820 * 821 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 822 * respectively, with an error less than 1%. The actual rates are determined 823 * by 824 * 825 * div = round(freq / (2 x prescale x request)) 826 * actual = freq / (2 x prescale x div) 827 * 828 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 829 * or 1 otherwise. 830 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 831 * otherwise. 832 */ 833 static void cp210x_change_speed(struct tty_struct *tty, 834 struct usb_serial_port *port, struct ktermios *old_termios) 835 { 836 u32 baud; 837 838 baud = tty->termios.c_ospeed; 839 840 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 841 * or to an arbitrary rate in [1M,2M]. 842 * 843 * NOTE: B0 is not implemented. 844 */ 845 baud = cp210x_quantise_baudrate(baud); 846 847 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 848 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 849 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 850 if (old_termios) 851 baud = old_termios->c_ospeed; 852 else 853 baud = 9600; 854 } 855 856 tty_encode_baud_rate(tty, baud, baud); 857 } 858 859 static void cp210x_set_termios(struct tty_struct *tty, 860 struct usb_serial_port *port, struct ktermios *old_termios) 861 { 862 struct device *dev = &port->dev; 863 unsigned int cflag, old_cflag; 864 u16 bits; 865 u8 modem_ctl[16]; 866 867 cflag = tty->termios.c_cflag; 868 old_cflag = old_termios->c_cflag; 869 870 if (tty->termios.c_ospeed != old_termios->c_ospeed) 871 cp210x_change_speed(tty, port, old_termios); 872 873 /* If the number of data bits is to be updated */ 874 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 875 cp210x_get_line_ctl(port, &bits); 876 bits &= ~BITS_DATA_MASK; 877 switch (cflag & CSIZE) { 878 case CS5: 879 bits |= BITS_DATA_5; 880 dev_dbg(dev, "%s - data bits = 5\n", __func__); 881 break; 882 case CS6: 883 bits |= BITS_DATA_6; 884 dev_dbg(dev, "%s - data bits = 6\n", __func__); 885 break; 886 case CS7: 887 bits |= BITS_DATA_7; 888 dev_dbg(dev, "%s - data bits = 7\n", __func__); 889 break; 890 case CS8: 891 bits |= BITS_DATA_8; 892 dev_dbg(dev, "%s - data bits = 8\n", __func__); 893 break; 894 /*case CS9: 895 bits |= BITS_DATA_9; 896 dev_dbg(dev, "%s - data bits = 9\n", __func__); 897 break;*/ 898 default: 899 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 900 bits |= BITS_DATA_8; 901 break; 902 } 903 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 904 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 905 } 906 907 if ((cflag & (PARENB|PARODD|CMSPAR)) != 908 (old_cflag & (PARENB|PARODD|CMSPAR))) { 909 cp210x_get_line_ctl(port, &bits); 910 bits &= ~BITS_PARITY_MASK; 911 if (cflag & PARENB) { 912 if (cflag & CMSPAR) { 913 if (cflag & PARODD) { 914 bits |= BITS_PARITY_MARK; 915 dev_dbg(dev, "%s - parity = MARK\n", __func__); 916 } else { 917 bits |= BITS_PARITY_SPACE; 918 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 919 } 920 } else { 921 if (cflag & PARODD) { 922 bits |= BITS_PARITY_ODD; 923 dev_dbg(dev, "%s - parity = ODD\n", __func__); 924 } else { 925 bits |= BITS_PARITY_EVEN; 926 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 927 } 928 } 929 } 930 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 931 dev_dbg(dev, "Parity mode not supported by device\n"); 932 } 933 934 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 935 cp210x_get_line_ctl(port, &bits); 936 bits &= ~BITS_STOP_MASK; 937 if (cflag & CSTOPB) { 938 bits |= BITS_STOP_2; 939 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 940 } else { 941 bits |= BITS_STOP_1; 942 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 943 } 944 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 945 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 946 } 947 948 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 949 950 /* Only bytes 0, 4 and 7 out of first 8 have functional bits */ 951 952 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl, 953 sizeof(modem_ctl)); 954 dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n", 955 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]); 956 957 if (cflag & CRTSCTS) { 958 modem_ctl[0] &= ~0x7B; 959 modem_ctl[0] |= 0x09; 960 modem_ctl[4] = 0x80; 961 /* FIXME - why clear reserved bits just read? */ 962 modem_ctl[5] = 0; 963 modem_ctl[6] = 0; 964 modem_ctl[7] = 0; 965 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 966 } else { 967 modem_ctl[0] &= ~0x7B; 968 modem_ctl[0] |= 0x01; 969 /* FIXME - OR here instead of assignment looks wrong */ 970 modem_ctl[4] |= 0x40; 971 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 972 } 973 974 dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n", 975 __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]); 976 cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl, 977 sizeof(modem_ctl)); 978 } 979 980 } 981 982 static int cp210x_tiocmset(struct tty_struct *tty, 983 unsigned int set, unsigned int clear) 984 { 985 struct usb_serial_port *port = tty->driver_data; 986 return cp210x_tiocmset_port(port, set, clear); 987 } 988 989 static int cp210x_tiocmset_port(struct usb_serial_port *port, 990 unsigned int set, unsigned int clear) 991 { 992 u16 control = 0; 993 994 if (set & TIOCM_RTS) { 995 control |= CONTROL_RTS; 996 control |= CONTROL_WRITE_RTS; 997 } 998 if (set & TIOCM_DTR) { 999 control |= CONTROL_DTR; 1000 control |= CONTROL_WRITE_DTR; 1001 } 1002 if (clear & TIOCM_RTS) { 1003 control &= ~CONTROL_RTS; 1004 control |= CONTROL_WRITE_RTS; 1005 } 1006 if (clear & TIOCM_DTR) { 1007 control &= ~CONTROL_DTR; 1008 control |= CONTROL_WRITE_DTR; 1009 } 1010 1011 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1012 1013 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1014 } 1015 1016 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1017 { 1018 if (on) 1019 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1020 else 1021 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1022 } 1023 1024 static int cp210x_tiocmget(struct tty_struct *tty) 1025 { 1026 struct usb_serial_port *port = tty->driver_data; 1027 u8 control; 1028 int result; 1029 1030 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1031 1032 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1033 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1034 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1035 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1036 |((control & CONTROL_RING)? TIOCM_RI : 0) 1037 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1038 1039 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1040 1041 return result; 1042 } 1043 1044 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1045 { 1046 struct usb_serial_port *port = tty->driver_data; 1047 u16 state; 1048 1049 if (break_state == 0) 1050 state = BREAK_OFF; 1051 else 1052 state = BREAK_ON; 1053 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1054 state == BREAK_OFF ? "off" : "on"); 1055 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1056 } 1057 1058 static int cp210x_port_probe(struct usb_serial_port *port) 1059 { 1060 struct usb_serial *serial = port->serial; 1061 struct usb_host_interface *cur_altsetting; 1062 struct cp210x_port_private *port_priv; 1063 int ret; 1064 1065 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1066 if (!port_priv) 1067 return -ENOMEM; 1068 1069 cur_altsetting = serial->interface->cur_altsetting; 1070 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1071 1072 usb_set_serial_port_data(port, port_priv); 1073 1074 ret = cp210x_detect_swapped_line_ctl(port); 1075 if (ret) { 1076 kfree(port_priv); 1077 return ret; 1078 } 1079 1080 return 0; 1081 } 1082 1083 static int cp210x_port_remove(struct usb_serial_port *port) 1084 { 1085 struct cp210x_port_private *port_priv; 1086 1087 port_priv = usb_get_serial_port_data(port); 1088 kfree(port_priv); 1089 1090 return 0; 1091 } 1092 1093 module_usb_serial_driver(serial_drivers, id_table); 1094 1095 MODULE_DESCRIPTION(DRIVER_DESC); 1096 MODULE_LICENSE("GPL"); 1097