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