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 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 335 struct cp210x_flow_ctl { 336 __le32 ulControlHandshake; 337 __le32 ulFlowReplace; 338 __le32 ulXonLimit; 339 __le32 ulXoffLimit; 340 } __packed; 341 342 /* cp210x_flow_ctl::ulControlHandshake */ 343 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 344 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 345 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 346 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 347 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 348 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 349 350 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 351 #define CP210X_SERIAL_DTR_INACTIVE 0 352 #define CP210X_SERIAL_DTR_ACTIVE 1 353 #define CP210X_SERIAL_DTR_FLOW_CTL 2 354 355 /* cp210x_flow_ctl::ulFlowReplace */ 356 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 357 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 358 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 359 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 360 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 361 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 362 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 363 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 364 365 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 366 #define CP210X_SERIAL_RTS_INACTIVE 0 367 #define CP210X_SERIAL_RTS_ACTIVE 1 368 #define CP210X_SERIAL_RTS_FLOW_CTL 2 369 370 /* 371 * Reads a variable-sized block of CP210X_ registers, identified by req. 372 * Returns data into buf in native USB byte order. 373 */ 374 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 375 void *buf, int bufsize) 376 { 377 struct usb_serial *serial = port->serial; 378 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 379 void *dmabuf; 380 int result; 381 382 dmabuf = kmalloc(bufsize, GFP_KERNEL); 383 if (!dmabuf) { 384 /* 385 * FIXME Some callers don't bother to check for error, 386 * at least give them consistent junk until they are fixed 387 */ 388 memset(buf, 0, bufsize); 389 return -ENOMEM; 390 } 391 392 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 393 req, REQTYPE_INTERFACE_TO_HOST, 0, 394 port_priv->bInterfaceNumber, dmabuf, bufsize, 395 USB_CTRL_SET_TIMEOUT); 396 if (result == bufsize) { 397 memcpy(buf, dmabuf, bufsize); 398 result = 0; 399 } else { 400 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 401 req, bufsize, result); 402 if (result >= 0) 403 result = -EPROTO; 404 405 /* 406 * FIXME Some callers don't bother to check for error, 407 * at least give them consistent junk until they are fixed 408 */ 409 memset(buf, 0, bufsize); 410 } 411 412 kfree(dmabuf); 413 414 return result; 415 } 416 417 /* 418 * Reads any 32-bit CP210X_ register identified by req. 419 */ 420 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 421 { 422 __le32 le32_val; 423 int err; 424 425 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 426 if (err) { 427 /* 428 * FIXME Some callers don't bother to check for error, 429 * at least give them consistent junk until they are fixed 430 */ 431 *val = 0; 432 return err; 433 } 434 435 *val = le32_to_cpu(le32_val); 436 437 return 0; 438 } 439 440 /* 441 * Reads any 16-bit CP210X_ register identified by req. 442 */ 443 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 444 { 445 __le16 le16_val; 446 int err; 447 448 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 449 if (err) 450 return err; 451 452 *val = le16_to_cpu(le16_val); 453 454 return 0; 455 } 456 457 /* 458 * Reads any 8-bit CP210X_ register identified by req. 459 */ 460 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 461 { 462 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 463 } 464 465 /* 466 * Writes any 16-bit CP210X_ register (req) whose value is passed 467 * entirely in the wValue field of the USB request. 468 */ 469 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 470 { 471 struct usb_serial *serial = port->serial; 472 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 473 int result; 474 475 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 476 req, REQTYPE_HOST_TO_INTERFACE, val, 477 port_priv->bInterfaceNumber, NULL, 0, 478 USB_CTRL_SET_TIMEOUT); 479 if (result < 0) { 480 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 481 req, result); 482 } 483 484 return result; 485 } 486 487 /* 488 * Writes a variable-sized block of CP210X_ registers, identified by req. 489 * Data in buf must be in native USB byte order. 490 */ 491 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 492 void *buf, int bufsize) 493 { 494 struct usb_serial *serial = port->serial; 495 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 496 void *dmabuf; 497 int result; 498 499 dmabuf = kmalloc(bufsize, GFP_KERNEL); 500 if (!dmabuf) 501 return -ENOMEM; 502 503 memcpy(dmabuf, buf, bufsize); 504 505 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 506 req, REQTYPE_HOST_TO_INTERFACE, 0, 507 port_priv->bInterfaceNumber, dmabuf, bufsize, 508 USB_CTRL_SET_TIMEOUT); 509 510 kfree(dmabuf); 511 512 if (result == bufsize) { 513 result = 0; 514 } else { 515 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 516 req, bufsize, result); 517 if (result >= 0) 518 result = -EPROTO; 519 } 520 521 return result; 522 } 523 524 /* 525 * Writes any 32-bit CP210X_ register identified by req. 526 */ 527 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 528 { 529 __le32 le32_val; 530 531 le32_val = cpu_to_le32(val); 532 533 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 534 } 535 536 /* 537 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 538 * Write a known good value 0x800, read it back. 539 * If it comes back swapped the bug is detected. 540 * Preserve the original register value. 541 */ 542 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 543 { 544 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 545 u16 line_ctl_save; 546 u16 line_ctl_test; 547 int err; 548 549 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 550 if (err) 551 return err; 552 553 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 554 if (err) 555 return err; 556 557 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 558 if (err) 559 return err; 560 561 if (line_ctl_test == 8) { 562 port_priv->has_swapped_line_ctl = true; 563 line_ctl_save = swab16(line_ctl_save); 564 } 565 566 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 567 } 568 569 /* 570 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 571 * to workaround cp2108 bug and get correct value. 572 */ 573 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 574 { 575 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 576 int err; 577 578 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 579 if (err) 580 return err; 581 582 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 583 if (port_priv->has_swapped_line_ctl) 584 *ctl = swab16(*ctl); 585 586 return 0; 587 } 588 589 /* 590 * cp210x_quantise_baudrate 591 * Quantises the baud rate as per AN205 Table 1 592 */ 593 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 594 { 595 if (baud <= 300) 596 baud = 300; 597 else if (baud <= 600) baud = 600; 598 else if (baud <= 1200) baud = 1200; 599 else if (baud <= 1800) baud = 1800; 600 else if (baud <= 2400) baud = 2400; 601 else if (baud <= 4000) baud = 4000; 602 else if (baud <= 4803) baud = 4800; 603 else if (baud <= 7207) baud = 7200; 604 else if (baud <= 9612) baud = 9600; 605 else if (baud <= 14428) baud = 14400; 606 else if (baud <= 16062) baud = 16000; 607 else if (baud <= 19250) baud = 19200; 608 else if (baud <= 28912) baud = 28800; 609 else if (baud <= 38601) baud = 38400; 610 else if (baud <= 51558) baud = 51200; 611 else if (baud <= 56280) baud = 56000; 612 else if (baud <= 58053) baud = 57600; 613 else if (baud <= 64111) baud = 64000; 614 else if (baud <= 77608) baud = 76800; 615 else if (baud <= 117028) baud = 115200; 616 else if (baud <= 129347) baud = 128000; 617 else if (baud <= 156868) baud = 153600; 618 else if (baud <= 237832) baud = 230400; 619 else if (baud <= 254234) baud = 250000; 620 else if (baud <= 273066) baud = 256000; 621 else if (baud <= 491520) baud = 460800; 622 else if (baud <= 567138) baud = 500000; 623 else if (baud <= 670254) baud = 576000; 624 else if (baud < 1000000) 625 baud = 921600; 626 else if (baud > 2000000) 627 baud = 2000000; 628 return baud; 629 } 630 631 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 632 { 633 int result; 634 635 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 636 if (result) { 637 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 638 return result; 639 } 640 641 /* Configure the termios structure */ 642 cp210x_get_termios(tty, port); 643 644 /* The baud rate must be initialised on cp2104 */ 645 if (tty) 646 cp210x_change_speed(tty, port, NULL); 647 648 return usb_serial_generic_open(tty, port); 649 } 650 651 static void cp210x_close(struct usb_serial_port *port) 652 { 653 usb_serial_generic_close(port); 654 655 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 656 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 657 658 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 659 } 660 661 /* 662 * Read how many bytes are waiting in the TX queue. 663 */ 664 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 665 u32 *count) 666 { 667 struct usb_serial *serial = port->serial; 668 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 669 struct cp210x_comm_status *sts; 670 int result; 671 672 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 673 if (!sts) 674 return -ENOMEM; 675 676 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 677 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 678 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 679 USB_CTRL_GET_TIMEOUT); 680 if (result == sizeof(*sts)) { 681 *count = le32_to_cpu(sts->ulAmountInOutQueue); 682 result = 0; 683 } else { 684 dev_err(&port->dev, "failed to get comm status: %d\n", result); 685 if (result >= 0) 686 result = -EPROTO; 687 } 688 689 kfree(sts); 690 691 return result; 692 } 693 694 static bool cp210x_tx_empty(struct usb_serial_port *port) 695 { 696 int err; 697 u32 count; 698 699 err = cp210x_get_tx_queue_byte_count(port, &count); 700 if (err) 701 return true; 702 703 return !count; 704 } 705 706 /* 707 * cp210x_get_termios 708 * Reads the baud rate, data bits, parity, stop bits and flow control mode 709 * from the device, corrects any unsupported values, and configures the 710 * termios structure to reflect the state of the device 711 */ 712 static void cp210x_get_termios(struct tty_struct *tty, 713 struct usb_serial_port *port) 714 { 715 unsigned int baud; 716 717 if (tty) { 718 cp210x_get_termios_port(tty->driver_data, 719 &tty->termios.c_cflag, &baud); 720 tty_encode_baud_rate(tty, baud, baud); 721 } else { 722 unsigned int cflag; 723 cflag = 0; 724 cp210x_get_termios_port(port, &cflag, &baud); 725 } 726 } 727 728 /* 729 * cp210x_get_termios_port 730 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 731 */ 732 static void cp210x_get_termios_port(struct usb_serial_port *port, 733 unsigned int *cflagp, unsigned int *baudp) 734 { 735 struct device *dev = &port->dev; 736 unsigned int cflag; 737 struct cp210x_flow_ctl flow_ctl; 738 u32 baud; 739 u16 bits; 740 u32 ctl_hs; 741 742 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 743 744 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 745 *baudp = baud; 746 747 cflag = *cflagp; 748 749 cp210x_get_line_ctl(port, &bits); 750 cflag &= ~CSIZE; 751 switch (bits & BITS_DATA_MASK) { 752 case BITS_DATA_5: 753 dev_dbg(dev, "%s - data bits = 5\n", __func__); 754 cflag |= CS5; 755 break; 756 case BITS_DATA_6: 757 dev_dbg(dev, "%s - data bits = 6\n", __func__); 758 cflag |= CS6; 759 break; 760 case BITS_DATA_7: 761 dev_dbg(dev, "%s - data bits = 7\n", __func__); 762 cflag |= CS7; 763 break; 764 case BITS_DATA_8: 765 dev_dbg(dev, "%s - data bits = 8\n", __func__); 766 cflag |= CS8; 767 break; 768 case BITS_DATA_9: 769 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 770 cflag |= CS8; 771 bits &= ~BITS_DATA_MASK; 772 bits |= BITS_DATA_8; 773 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 774 break; 775 default: 776 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 777 cflag |= CS8; 778 bits &= ~BITS_DATA_MASK; 779 bits |= BITS_DATA_8; 780 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 781 break; 782 } 783 784 switch (bits & BITS_PARITY_MASK) { 785 case BITS_PARITY_NONE: 786 dev_dbg(dev, "%s - parity = NONE\n", __func__); 787 cflag &= ~PARENB; 788 break; 789 case BITS_PARITY_ODD: 790 dev_dbg(dev, "%s - parity = ODD\n", __func__); 791 cflag |= (PARENB|PARODD); 792 break; 793 case BITS_PARITY_EVEN: 794 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 795 cflag &= ~PARODD; 796 cflag |= PARENB; 797 break; 798 case BITS_PARITY_MARK: 799 dev_dbg(dev, "%s - parity = MARK\n", __func__); 800 cflag |= (PARENB|PARODD|CMSPAR); 801 break; 802 case BITS_PARITY_SPACE: 803 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 804 cflag &= ~PARODD; 805 cflag |= (PARENB|CMSPAR); 806 break; 807 default: 808 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 809 cflag &= ~PARENB; 810 bits &= ~BITS_PARITY_MASK; 811 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 812 break; 813 } 814 815 cflag &= ~CSTOPB; 816 switch (bits & BITS_STOP_MASK) { 817 case BITS_STOP_1: 818 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 819 break; 820 case BITS_STOP_1_5: 821 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 822 bits &= ~BITS_STOP_MASK; 823 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 824 break; 825 case BITS_STOP_2: 826 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 827 cflag |= CSTOPB; 828 break; 829 default: 830 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 831 bits &= ~BITS_STOP_MASK; 832 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 833 break; 834 } 835 836 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 837 sizeof(flow_ctl)); 838 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 839 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 840 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 841 cflag |= CRTSCTS; 842 } else { 843 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 844 cflag &= ~CRTSCTS; 845 } 846 847 *cflagp = cflag; 848 } 849 850 /* 851 * CP2101 supports the following baud rates: 852 * 853 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 854 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 855 * 856 * CP2102 and CP2103 support the following additional rates: 857 * 858 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 859 * 576000 860 * 861 * The device will map a requested rate to a supported one, but the result 862 * of requests for rates greater than 1053257 is undefined (see AN205). 863 * 864 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 865 * respectively, with an error less than 1%. The actual rates are determined 866 * by 867 * 868 * div = round(freq / (2 x prescale x request)) 869 * actual = freq / (2 x prescale x div) 870 * 871 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 872 * or 1 otherwise. 873 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 874 * otherwise. 875 */ 876 static void cp210x_change_speed(struct tty_struct *tty, 877 struct usb_serial_port *port, struct ktermios *old_termios) 878 { 879 u32 baud; 880 881 baud = tty->termios.c_ospeed; 882 883 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 884 * or to an arbitrary rate in [1M,2M]. 885 * 886 * NOTE: B0 is not implemented. 887 */ 888 baud = cp210x_quantise_baudrate(baud); 889 890 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 891 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 892 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 893 if (old_termios) 894 baud = old_termios->c_ospeed; 895 else 896 baud = 9600; 897 } 898 899 tty_encode_baud_rate(tty, baud, baud); 900 } 901 902 static void cp210x_set_termios(struct tty_struct *tty, 903 struct usb_serial_port *port, struct ktermios *old_termios) 904 { 905 struct device *dev = &port->dev; 906 unsigned int cflag, old_cflag; 907 u16 bits; 908 909 cflag = tty->termios.c_cflag; 910 old_cflag = old_termios->c_cflag; 911 912 if (tty->termios.c_ospeed != old_termios->c_ospeed) 913 cp210x_change_speed(tty, port, old_termios); 914 915 /* If the number of data bits is to be updated */ 916 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 917 cp210x_get_line_ctl(port, &bits); 918 bits &= ~BITS_DATA_MASK; 919 switch (cflag & CSIZE) { 920 case CS5: 921 bits |= BITS_DATA_5; 922 dev_dbg(dev, "%s - data bits = 5\n", __func__); 923 break; 924 case CS6: 925 bits |= BITS_DATA_6; 926 dev_dbg(dev, "%s - data bits = 6\n", __func__); 927 break; 928 case CS7: 929 bits |= BITS_DATA_7; 930 dev_dbg(dev, "%s - data bits = 7\n", __func__); 931 break; 932 case CS8: 933 bits |= BITS_DATA_8; 934 dev_dbg(dev, "%s - data bits = 8\n", __func__); 935 break; 936 /*case CS9: 937 bits |= BITS_DATA_9; 938 dev_dbg(dev, "%s - data bits = 9\n", __func__); 939 break;*/ 940 default: 941 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 942 bits |= BITS_DATA_8; 943 break; 944 } 945 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 946 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 947 } 948 949 if ((cflag & (PARENB|PARODD|CMSPAR)) != 950 (old_cflag & (PARENB|PARODD|CMSPAR))) { 951 cp210x_get_line_ctl(port, &bits); 952 bits &= ~BITS_PARITY_MASK; 953 if (cflag & PARENB) { 954 if (cflag & CMSPAR) { 955 if (cflag & PARODD) { 956 bits |= BITS_PARITY_MARK; 957 dev_dbg(dev, "%s - parity = MARK\n", __func__); 958 } else { 959 bits |= BITS_PARITY_SPACE; 960 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 961 } 962 } else { 963 if (cflag & PARODD) { 964 bits |= BITS_PARITY_ODD; 965 dev_dbg(dev, "%s - parity = ODD\n", __func__); 966 } else { 967 bits |= BITS_PARITY_EVEN; 968 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 969 } 970 } 971 } 972 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 973 dev_dbg(dev, "Parity mode not supported by device\n"); 974 } 975 976 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 977 cp210x_get_line_ctl(port, &bits); 978 bits &= ~BITS_STOP_MASK; 979 if (cflag & CSTOPB) { 980 bits |= BITS_STOP_2; 981 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 982 } else { 983 bits |= BITS_STOP_1; 984 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 985 } 986 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 987 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 988 } 989 990 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 991 struct cp210x_flow_ctl flow_ctl; 992 u32 ctl_hs; 993 u32 flow_repl; 994 995 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 996 sizeof(flow_ctl)); 997 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 998 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 999 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1000 __func__, ctl_hs, flow_repl); 1001 1002 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1003 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1004 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1005 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1006 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1007 if (cflag & CRTSCTS) { 1008 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1009 1010 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1011 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1012 CP210X_SERIAL_RTS_FLOW_CTL); 1013 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1014 } else { 1015 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1016 1017 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1018 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1019 CP210X_SERIAL_RTS_ACTIVE); 1020 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1021 } 1022 1023 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1024 __func__, ctl_hs, flow_repl); 1025 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1026 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1027 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1028 sizeof(flow_ctl)); 1029 } 1030 1031 } 1032 1033 static int cp210x_tiocmset(struct tty_struct *tty, 1034 unsigned int set, unsigned int clear) 1035 { 1036 struct usb_serial_port *port = tty->driver_data; 1037 return cp210x_tiocmset_port(port, set, clear); 1038 } 1039 1040 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1041 unsigned int set, unsigned int clear) 1042 { 1043 u16 control = 0; 1044 1045 if (set & TIOCM_RTS) { 1046 control |= CONTROL_RTS; 1047 control |= CONTROL_WRITE_RTS; 1048 } 1049 if (set & TIOCM_DTR) { 1050 control |= CONTROL_DTR; 1051 control |= CONTROL_WRITE_DTR; 1052 } 1053 if (clear & TIOCM_RTS) { 1054 control &= ~CONTROL_RTS; 1055 control |= CONTROL_WRITE_RTS; 1056 } 1057 if (clear & TIOCM_DTR) { 1058 control &= ~CONTROL_DTR; 1059 control |= CONTROL_WRITE_DTR; 1060 } 1061 1062 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1063 1064 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1065 } 1066 1067 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1068 { 1069 if (on) 1070 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1071 else 1072 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1073 } 1074 1075 static int cp210x_tiocmget(struct tty_struct *tty) 1076 { 1077 struct usb_serial_port *port = tty->driver_data; 1078 u8 control; 1079 int result; 1080 1081 cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1082 1083 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1084 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1085 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1086 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1087 |((control & CONTROL_RING)? TIOCM_RI : 0) 1088 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1089 1090 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1091 1092 return result; 1093 } 1094 1095 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1096 { 1097 struct usb_serial_port *port = tty->driver_data; 1098 u16 state; 1099 1100 if (break_state == 0) 1101 state = BREAK_OFF; 1102 else 1103 state = BREAK_ON; 1104 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1105 state == BREAK_OFF ? "off" : "on"); 1106 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1107 } 1108 1109 static int cp210x_port_probe(struct usb_serial_port *port) 1110 { 1111 struct usb_serial *serial = port->serial; 1112 struct usb_host_interface *cur_altsetting; 1113 struct cp210x_port_private *port_priv; 1114 int ret; 1115 1116 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1117 if (!port_priv) 1118 return -ENOMEM; 1119 1120 cur_altsetting = serial->interface->cur_altsetting; 1121 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1122 1123 usb_set_serial_port_data(port, port_priv); 1124 1125 ret = cp210x_detect_swapped_line_ctl(port); 1126 if (ret) { 1127 kfree(port_priv); 1128 return ret; 1129 } 1130 1131 return 0; 1132 } 1133 1134 static int cp210x_port_remove(struct usb_serial_port *port) 1135 { 1136 struct cp210x_port_private *port_priv; 1137 1138 port_priv = usb_get_serial_port_data(port); 1139 kfree(port_priv); 1140 1141 return 0; 1142 } 1143 1144 module_usb_serial_driver(serial_drivers, id_table); 1145 1146 MODULE_DESCRIPTION(DRIVER_DESC); 1147 MODULE_LICENSE("GPL"); 1148