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 #include <linux/gpio/driver.h> 27 #include <linux/bitops.h> 28 #include <linux/mutex.h> 29 30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 31 32 /* 33 * Function Prototypes 34 */ 35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 36 static void cp210x_close(struct usb_serial_port *); 37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); 38 static void cp210x_get_termios_port(struct usb_serial_port *port, 39 tcflag_t *cflagp, unsigned int *baudp); 40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 41 struct ktermios *); 42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 43 struct ktermios*); 44 static bool cp210x_tx_empty(struct usb_serial_port *port); 45 static int cp210x_tiocmget(struct tty_struct *); 46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 47 static int cp210x_tiocmset_port(struct usb_serial_port *port, 48 unsigned int, unsigned int); 49 static void cp210x_break_ctl(struct tty_struct *, int); 50 static int cp210x_attach(struct usb_serial *); 51 static void cp210x_disconnect(struct usb_serial *); 52 static void cp210x_release(struct usb_serial *); 53 static int cp210x_port_probe(struct usb_serial_port *); 54 static int cp210x_port_remove(struct usb_serial_port *); 55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 56 57 static const struct usb_device_id id_table[] = { 58 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 59 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 60 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 61 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 62 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 63 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 64 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 65 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 66 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 67 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 68 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 69 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 71 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 72 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 73 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 74 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 75 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 76 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 77 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 78 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 79 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 80 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 81 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 82 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 83 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 84 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 118 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 119 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 120 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 121 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 122 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 123 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 124 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 125 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 127 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 128 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 129 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 130 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 131 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 132 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 133 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 134 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 135 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 136 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 137 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 138 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 139 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 140 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 141 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 142 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 143 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 144 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 145 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 146 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 147 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 148 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 149 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 150 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 151 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 152 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 153 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 154 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 155 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 156 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 157 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 158 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 159 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 160 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 161 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 162 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 163 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 164 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 165 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 166 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 167 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 168 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 169 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 170 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 171 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 172 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 173 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 174 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 175 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 176 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 177 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 178 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 179 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 180 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 181 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 182 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 183 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 184 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 185 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 186 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 187 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 188 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 189 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 190 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 191 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 192 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 193 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 194 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 195 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 196 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 197 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 198 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 199 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 200 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 201 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 202 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 203 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 204 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 205 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 206 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 207 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 208 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 209 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 210 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 211 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 212 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 213 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 214 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 215 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 216 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 217 { } /* Terminating Entry */ 218 }; 219 220 MODULE_DEVICE_TABLE(usb, id_table); 221 222 struct cp210x_serial_private { 223 #ifdef CONFIG_GPIOLIB 224 struct gpio_chip gc; 225 u8 config; 226 u8 gpio_mode; 227 bool gpio_registered; 228 #endif 229 u8 partnum; 230 }; 231 232 struct cp210x_port_private { 233 __u8 bInterfaceNumber; 234 bool has_swapped_line_ctl; 235 }; 236 237 static struct usb_serial_driver cp210x_device = { 238 .driver = { 239 .owner = THIS_MODULE, 240 .name = "cp210x", 241 }, 242 .id_table = id_table, 243 .num_ports = 1, 244 .bulk_in_size = 256, 245 .bulk_out_size = 256, 246 .open = cp210x_open, 247 .close = cp210x_close, 248 .break_ctl = cp210x_break_ctl, 249 .set_termios = cp210x_set_termios, 250 .tx_empty = cp210x_tx_empty, 251 .tiocmget = cp210x_tiocmget, 252 .tiocmset = cp210x_tiocmset, 253 .attach = cp210x_attach, 254 .disconnect = cp210x_disconnect, 255 .release = cp210x_release, 256 .port_probe = cp210x_port_probe, 257 .port_remove = cp210x_port_remove, 258 .dtr_rts = cp210x_dtr_rts 259 }; 260 261 static struct usb_serial_driver * const serial_drivers[] = { 262 &cp210x_device, NULL 263 }; 264 265 /* Config request types */ 266 #define REQTYPE_HOST_TO_INTERFACE 0x41 267 #define REQTYPE_INTERFACE_TO_HOST 0xc1 268 #define REQTYPE_HOST_TO_DEVICE 0x40 269 #define REQTYPE_DEVICE_TO_HOST 0xc0 270 271 /* Config request codes */ 272 #define CP210X_IFC_ENABLE 0x00 273 #define CP210X_SET_BAUDDIV 0x01 274 #define CP210X_GET_BAUDDIV 0x02 275 #define CP210X_SET_LINE_CTL 0x03 276 #define CP210X_GET_LINE_CTL 0x04 277 #define CP210X_SET_BREAK 0x05 278 #define CP210X_IMM_CHAR 0x06 279 #define CP210X_SET_MHS 0x07 280 #define CP210X_GET_MDMSTS 0x08 281 #define CP210X_SET_XON 0x09 282 #define CP210X_SET_XOFF 0x0A 283 #define CP210X_SET_EVENTMASK 0x0B 284 #define CP210X_GET_EVENTMASK 0x0C 285 #define CP210X_SET_CHAR 0x0D 286 #define CP210X_GET_CHARS 0x0E 287 #define CP210X_GET_PROPS 0x0F 288 #define CP210X_GET_COMM_STATUS 0x10 289 #define CP210X_RESET 0x11 290 #define CP210X_PURGE 0x12 291 #define CP210X_SET_FLOW 0x13 292 #define CP210X_GET_FLOW 0x14 293 #define CP210X_EMBED_EVENTS 0x15 294 #define CP210X_GET_EVENTSTATE 0x16 295 #define CP210X_SET_CHARS 0x19 296 #define CP210X_GET_BAUDRATE 0x1D 297 #define CP210X_SET_BAUDRATE 0x1E 298 #define CP210X_VENDOR_SPECIFIC 0xFF 299 300 /* CP210X_IFC_ENABLE */ 301 #define UART_ENABLE 0x0001 302 #define UART_DISABLE 0x0000 303 304 /* CP210X_(SET|GET)_BAUDDIV */ 305 #define BAUD_RATE_GEN_FREQ 0x384000 306 307 /* CP210X_(SET|GET)_LINE_CTL */ 308 #define BITS_DATA_MASK 0X0f00 309 #define BITS_DATA_5 0X0500 310 #define BITS_DATA_6 0X0600 311 #define BITS_DATA_7 0X0700 312 #define BITS_DATA_8 0X0800 313 #define BITS_DATA_9 0X0900 314 315 #define BITS_PARITY_MASK 0x00f0 316 #define BITS_PARITY_NONE 0x0000 317 #define BITS_PARITY_ODD 0x0010 318 #define BITS_PARITY_EVEN 0x0020 319 #define BITS_PARITY_MARK 0x0030 320 #define BITS_PARITY_SPACE 0x0040 321 322 #define BITS_STOP_MASK 0x000f 323 #define BITS_STOP_1 0x0000 324 #define BITS_STOP_1_5 0x0001 325 #define BITS_STOP_2 0x0002 326 327 /* CP210X_SET_BREAK */ 328 #define BREAK_ON 0x0001 329 #define BREAK_OFF 0x0000 330 331 /* CP210X_(SET_MHS|GET_MDMSTS) */ 332 #define CONTROL_DTR 0x0001 333 #define CONTROL_RTS 0x0002 334 #define CONTROL_CTS 0x0010 335 #define CONTROL_DSR 0x0020 336 #define CONTROL_RING 0x0040 337 #define CONTROL_DCD 0x0080 338 #define CONTROL_WRITE_DTR 0x0100 339 #define CONTROL_WRITE_RTS 0x0200 340 341 /* CP210X_VENDOR_SPECIFIC values */ 342 #define CP210X_READ_LATCH 0x00C2 343 #define CP210X_GET_PARTNUM 0x370B 344 #define CP210X_GET_PORTCONFIG 0x370C 345 #define CP210X_GET_DEVICEMODE 0x3711 346 #define CP210X_WRITE_LATCH 0x37E1 347 348 /* Part number definitions */ 349 #define CP210X_PARTNUM_CP2101 0x01 350 #define CP210X_PARTNUM_CP2102 0x02 351 #define CP210X_PARTNUM_CP2103 0x03 352 #define CP210X_PARTNUM_CP2104 0x04 353 #define CP210X_PARTNUM_CP2105 0x05 354 #define CP210X_PARTNUM_CP2108 0x08 355 356 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 357 struct cp210x_comm_status { 358 __le32 ulErrors; 359 __le32 ulHoldReasons; 360 __le32 ulAmountInInQueue; 361 __le32 ulAmountInOutQueue; 362 u8 bEofReceived; 363 u8 bWaitForImmediate; 364 u8 bReserved; 365 } __packed; 366 367 /* 368 * CP210X_PURGE - 16 bits passed in wValue of USB request. 369 * SiLabs app note AN571 gives a strange description of the 4 bits: 370 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 371 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 372 */ 373 #define PURGE_ALL 0x000f 374 375 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 376 struct cp210x_flow_ctl { 377 __le32 ulControlHandshake; 378 __le32 ulFlowReplace; 379 __le32 ulXonLimit; 380 __le32 ulXoffLimit; 381 } __packed; 382 383 /* cp210x_flow_ctl::ulControlHandshake */ 384 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 385 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 386 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 387 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 388 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 389 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 390 391 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 392 #define CP210X_SERIAL_DTR_INACTIVE 0 393 #define CP210X_SERIAL_DTR_ACTIVE 1 394 #define CP210X_SERIAL_DTR_FLOW_CTL 2 395 396 /* cp210x_flow_ctl::ulFlowReplace */ 397 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 398 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 399 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 400 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 401 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 402 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 403 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 404 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 405 406 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 407 #define CP210X_SERIAL_RTS_INACTIVE 0 408 #define CP210X_SERIAL_RTS_ACTIVE 1 409 #define CP210X_SERIAL_RTS_FLOW_CTL 2 410 411 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 412 struct cp210x_pin_mode { 413 u8 eci; 414 u8 sci; 415 } __packed; 416 417 #define CP210X_PIN_MODE_MODEM 0 418 #define CP210X_PIN_MODE_GPIO BIT(0) 419 420 /* 421 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes. 422 * Structure needs padding due to unused/unspecified bytes. 423 */ 424 struct cp210x_config { 425 __le16 gpio_mode; 426 u8 __pad0[2]; 427 __le16 reset_state; 428 u8 __pad1[4]; 429 __le16 suspend_state; 430 u8 sci_cfg; 431 u8 eci_cfg; 432 u8 device_cfg; 433 } __packed; 434 435 /* GPIO modes */ 436 #define CP210X_SCI_GPIO_MODE_OFFSET 9 437 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 438 439 #define CP210X_ECI_GPIO_MODE_OFFSET 2 440 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 441 442 /* CP2105 port configuration values */ 443 #define CP2105_GPIO0_TXLED_MODE BIT(0) 444 #define CP2105_GPIO1_RXLED_MODE BIT(1) 445 #define CP2105_GPIO1_RS485_MODE BIT(2) 446 447 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 448 struct cp210x_gpio_write { 449 u8 mask; 450 u8 state; 451 } __packed; 452 453 /* 454 * Helper to get interface number when we only have struct usb_serial. 455 */ 456 static u8 cp210x_interface_num(struct usb_serial *serial) 457 { 458 struct usb_host_interface *cur_altsetting; 459 460 cur_altsetting = serial->interface->cur_altsetting; 461 462 return cur_altsetting->desc.bInterfaceNumber; 463 } 464 465 /* 466 * Reads a variable-sized block of CP210X_ registers, identified by req. 467 * Returns data into buf in native USB byte order. 468 */ 469 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 470 void *buf, int bufsize) 471 { 472 struct usb_serial *serial = port->serial; 473 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 474 void *dmabuf; 475 int result; 476 477 dmabuf = kmalloc(bufsize, GFP_KERNEL); 478 if (!dmabuf) { 479 /* 480 * FIXME Some callers don't bother to check for error, 481 * at least give them consistent junk until they are fixed 482 */ 483 memset(buf, 0, bufsize); 484 return -ENOMEM; 485 } 486 487 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 488 req, REQTYPE_INTERFACE_TO_HOST, 0, 489 port_priv->bInterfaceNumber, dmabuf, bufsize, 490 USB_CTRL_SET_TIMEOUT); 491 if (result == bufsize) { 492 memcpy(buf, dmabuf, bufsize); 493 result = 0; 494 } else { 495 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 496 req, bufsize, result); 497 if (result >= 0) 498 result = -EIO; 499 500 /* 501 * FIXME Some callers don't bother to check for error, 502 * at least give them consistent junk until they are fixed 503 */ 504 memset(buf, 0, bufsize); 505 } 506 507 kfree(dmabuf); 508 509 return result; 510 } 511 512 /* 513 * Reads any 32-bit CP210X_ register identified by req. 514 */ 515 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 516 { 517 __le32 le32_val; 518 int err; 519 520 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 521 if (err) { 522 /* 523 * FIXME Some callers don't bother to check for error, 524 * at least give them consistent junk until they are fixed 525 */ 526 *val = 0; 527 return err; 528 } 529 530 *val = le32_to_cpu(le32_val); 531 532 return 0; 533 } 534 535 /* 536 * Reads any 16-bit CP210X_ register identified by req. 537 */ 538 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 539 { 540 __le16 le16_val; 541 int err; 542 543 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 544 if (err) 545 return err; 546 547 *val = le16_to_cpu(le16_val); 548 549 return 0; 550 } 551 552 /* 553 * Reads any 8-bit CP210X_ register identified by req. 554 */ 555 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 556 { 557 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 558 } 559 560 /* 561 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 562 * Returns data into buf in native USB byte order. 563 */ 564 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 565 void *buf, int bufsize) 566 { 567 void *dmabuf; 568 int result; 569 570 dmabuf = kmalloc(bufsize, GFP_KERNEL); 571 if (!dmabuf) 572 return -ENOMEM; 573 574 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 575 CP210X_VENDOR_SPECIFIC, type, val, 576 cp210x_interface_num(serial), dmabuf, bufsize, 577 USB_CTRL_GET_TIMEOUT); 578 if (result == bufsize) { 579 memcpy(buf, dmabuf, bufsize); 580 result = 0; 581 } else { 582 dev_err(&serial->interface->dev, 583 "failed to get vendor val 0x%04x size %d: %d\n", val, 584 bufsize, result); 585 if (result >= 0) 586 result = -EIO; 587 } 588 589 kfree(dmabuf); 590 591 return result; 592 } 593 594 /* 595 * Writes any 16-bit CP210X_ register (req) whose value is passed 596 * entirely in the wValue field of the USB request. 597 */ 598 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 599 { 600 struct usb_serial *serial = port->serial; 601 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 602 int result; 603 604 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 605 req, REQTYPE_HOST_TO_INTERFACE, val, 606 port_priv->bInterfaceNumber, NULL, 0, 607 USB_CTRL_SET_TIMEOUT); 608 if (result < 0) { 609 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 610 req, result); 611 } 612 613 return result; 614 } 615 616 /* 617 * Writes a variable-sized block of CP210X_ registers, identified by req. 618 * Data in buf must be in native USB byte order. 619 */ 620 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 621 void *buf, int bufsize) 622 { 623 struct usb_serial *serial = port->serial; 624 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 625 void *dmabuf; 626 int result; 627 628 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 629 if (!dmabuf) 630 return -ENOMEM; 631 632 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 633 req, REQTYPE_HOST_TO_INTERFACE, 0, 634 port_priv->bInterfaceNumber, dmabuf, bufsize, 635 USB_CTRL_SET_TIMEOUT); 636 637 kfree(dmabuf); 638 639 if (result == bufsize) { 640 result = 0; 641 } else { 642 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 643 req, bufsize, result); 644 if (result >= 0) 645 result = -EIO; 646 } 647 648 return result; 649 } 650 651 /* 652 * Writes any 32-bit CP210X_ register identified by req. 653 */ 654 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 655 { 656 __le32 le32_val; 657 658 le32_val = cpu_to_le32(val); 659 660 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 661 } 662 663 #ifdef CONFIG_GPIOLIB 664 /* 665 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 666 * Data in buf must be in native USB byte order. 667 */ 668 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 669 u16 val, void *buf, int bufsize) 670 { 671 void *dmabuf; 672 int result; 673 674 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 675 if (!dmabuf) 676 return -ENOMEM; 677 678 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 679 CP210X_VENDOR_SPECIFIC, type, val, 680 cp210x_interface_num(serial), dmabuf, bufsize, 681 USB_CTRL_SET_TIMEOUT); 682 683 kfree(dmabuf); 684 685 if (result == bufsize) { 686 result = 0; 687 } else { 688 dev_err(&serial->interface->dev, 689 "failed to set vendor val 0x%04x size %d: %d\n", val, 690 bufsize, result); 691 if (result >= 0) 692 result = -EIO; 693 } 694 695 return result; 696 } 697 #endif 698 699 /* 700 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 701 * Write a known good value 0x800, read it back. 702 * If it comes back swapped the bug is detected. 703 * Preserve the original register value. 704 */ 705 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 706 { 707 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 708 u16 line_ctl_save; 709 u16 line_ctl_test; 710 int err; 711 712 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 713 if (err) 714 return err; 715 716 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 717 if (err) 718 return err; 719 720 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 721 if (err) 722 return err; 723 724 if (line_ctl_test == 8) { 725 port_priv->has_swapped_line_ctl = true; 726 line_ctl_save = swab16(line_ctl_save); 727 } 728 729 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 730 } 731 732 /* 733 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 734 * to workaround cp2108 bug and get correct value. 735 */ 736 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 737 { 738 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 739 int err; 740 741 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 742 if (err) 743 return err; 744 745 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 746 if (port_priv->has_swapped_line_ctl) 747 *ctl = swab16(*ctl); 748 749 return 0; 750 } 751 752 /* 753 * cp210x_quantise_baudrate 754 * Quantises the baud rate as per AN205 Table 1 755 */ 756 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 757 { 758 if (baud <= 300) 759 baud = 300; 760 else if (baud <= 600) baud = 600; 761 else if (baud <= 1200) baud = 1200; 762 else if (baud <= 1800) baud = 1800; 763 else if (baud <= 2400) baud = 2400; 764 else if (baud <= 4000) baud = 4000; 765 else if (baud <= 4803) baud = 4800; 766 else if (baud <= 7207) baud = 7200; 767 else if (baud <= 9612) baud = 9600; 768 else if (baud <= 14428) baud = 14400; 769 else if (baud <= 16062) baud = 16000; 770 else if (baud <= 19250) baud = 19200; 771 else if (baud <= 28912) baud = 28800; 772 else if (baud <= 38601) baud = 38400; 773 else if (baud <= 51558) baud = 51200; 774 else if (baud <= 56280) baud = 56000; 775 else if (baud <= 58053) baud = 57600; 776 else if (baud <= 64111) baud = 64000; 777 else if (baud <= 77608) baud = 76800; 778 else if (baud <= 117028) baud = 115200; 779 else if (baud <= 129347) baud = 128000; 780 else if (baud <= 156868) baud = 153600; 781 else if (baud <= 237832) baud = 230400; 782 else if (baud <= 254234) baud = 250000; 783 else if (baud <= 273066) baud = 256000; 784 else if (baud <= 491520) baud = 460800; 785 else if (baud <= 567138) baud = 500000; 786 else if (baud <= 670254) baud = 576000; 787 else if (baud < 1000000) 788 baud = 921600; 789 else if (baud > 2000000) 790 baud = 2000000; 791 return baud; 792 } 793 794 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 795 { 796 int result; 797 798 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 799 if (result) { 800 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 801 return result; 802 } 803 804 /* Configure the termios structure */ 805 cp210x_get_termios(tty, port); 806 807 /* The baud rate must be initialised on cp2104 */ 808 if (tty) 809 cp210x_change_speed(tty, port, NULL); 810 811 return usb_serial_generic_open(tty, port); 812 } 813 814 static void cp210x_close(struct usb_serial_port *port) 815 { 816 usb_serial_generic_close(port); 817 818 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 819 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 820 821 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 822 } 823 824 /* 825 * Read how many bytes are waiting in the TX queue. 826 */ 827 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 828 u32 *count) 829 { 830 struct usb_serial *serial = port->serial; 831 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 832 struct cp210x_comm_status *sts; 833 int result; 834 835 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 836 if (!sts) 837 return -ENOMEM; 838 839 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 840 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 841 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 842 USB_CTRL_GET_TIMEOUT); 843 if (result == sizeof(*sts)) { 844 *count = le32_to_cpu(sts->ulAmountInOutQueue); 845 result = 0; 846 } else { 847 dev_err(&port->dev, "failed to get comm status: %d\n", result); 848 if (result >= 0) 849 result = -EIO; 850 } 851 852 kfree(sts); 853 854 return result; 855 } 856 857 static bool cp210x_tx_empty(struct usb_serial_port *port) 858 { 859 int err; 860 u32 count; 861 862 err = cp210x_get_tx_queue_byte_count(port, &count); 863 if (err) 864 return true; 865 866 return !count; 867 } 868 869 /* 870 * cp210x_get_termios 871 * Reads the baud rate, data bits, parity, stop bits and flow control mode 872 * from the device, corrects any unsupported values, and configures the 873 * termios structure to reflect the state of the device 874 */ 875 static void cp210x_get_termios(struct tty_struct *tty, 876 struct usb_serial_port *port) 877 { 878 unsigned int baud; 879 880 if (tty) { 881 cp210x_get_termios_port(tty->driver_data, 882 &tty->termios.c_cflag, &baud); 883 tty_encode_baud_rate(tty, baud, baud); 884 } else { 885 tcflag_t cflag; 886 cflag = 0; 887 cp210x_get_termios_port(port, &cflag, &baud); 888 } 889 } 890 891 /* 892 * cp210x_get_termios_port 893 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 894 */ 895 static void cp210x_get_termios_port(struct usb_serial_port *port, 896 tcflag_t *cflagp, unsigned int *baudp) 897 { 898 struct device *dev = &port->dev; 899 tcflag_t cflag; 900 struct cp210x_flow_ctl flow_ctl; 901 u32 baud; 902 u16 bits; 903 u32 ctl_hs; 904 905 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 906 907 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 908 *baudp = baud; 909 910 cflag = *cflagp; 911 912 cp210x_get_line_ctl(port, &bits); 913 cflag &= ~CSIZE; 914 switch (bits & BITS_DATA_MASK) { 915 case BITS_DATA_5: 916 dev_dbg(dev, "%s - data bits = 5\n", __func__); 917 cflag |= CS5; 918 break; 919 case BITS_DATA_6: 920 dev_dbg(dev, "%s - data bits = 6\n", __func__); 921 cflag |= CS6; 922 break; 923 case BITS_DATA_7: 924 dev_dbg(dev, "%s - data bits = 7\n", __func__); 925 cflag |= CS7; 926 break; 927 case BITS_DATA_8: 928 dev_dbg(dev, "%s - data bits = 8\n", __func__); 929 cflag |= CS8; 930 break; 931 case BITS_DATA_9: 932 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 933 cflag |= CS8; 934 bits &= ~BITS_DATA_MASK; 935 bits |= BITS_DATA_8; 936 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 937 break; 938 default: 939 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 940 cflag |= CS8; 941 bits &= ~BITS_DATA_MASK; 942 bits |= BITS_DATA_8; 943 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 944 break; 945 } 946 947 switch (bits & BITS_PARITY_MASK) { 948 case BITS_PARITY_NONE: 949 dev_dbg(dev, "%s - parity = NONE\n", __func__); 950 cflag &= ~PARENB; 951 break; 952 case BITS_PARITY_ODD: 953 dev_dbg(dev, "%s - parity = ODD\n", __func__); 954 cflag |= (PARENB|PARODD); 955 break; 956 case BITS_PARITY_EVEN: 957 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 958 cflag &= ~PARODD; 959 cflag |= PARENB; 960 break; 961 case BITS_PARITY_MARK: 962 dev_dbg(dev, "%s - parity = MARK\n", __func__); 963 cflag |= (PARENB|PARODD|CMSPAR); 964 break; 965 case BITS_PARITY_SPACE: 966 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 967 cflag &= ~PARODD; 968 cflag |= (PARENB|CMSPAR); 969 break; 970 default: 971 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 972 cflag &= ~PARENB; 973 bits &= ~BITS_PARITY_MASK; 974 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 975 break; 976 } 977 978 cflag &= ~CSTOPB; 979 switch (bits & BITS_STOP_MASK) { 980 case BITS_STOP_1: 981 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 982 break; 983 case BITS_STOP_1_5: 984 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 985 bits &= ~BITS_STOP_MASK; 986 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 987 break; 988 case BITS_STOP_2: 989 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 990 cflag |= CSTOPB; 991 break; 992 default: 993 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 994 bits &= ~BITS_STOP_MASK; 995 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 996 break; 997 } 998 999 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1000 sizeof(flow_ctl)); 1001 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1002 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1003 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1004 cflag |= CRTSCTS; 1005 } else { 1006 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1007 cflag &= ~CRTSCTS; 1008 } 1009 1010 *cflagp = cflag; 1011 } 1012 1013 /* 1014 * CP2101 supports the following baud rates: 1015 * 1016 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1017 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1018 * 1019 * CP2102 and CP2103 support the following additional rates: 1020 * 1021 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1022 * 576000 1023 * 1024 * The device will map a requested rate to a supported one, but the result 1025 * of requests for rates greater than 1053257 is undefined (see AN205). 1026 * 1027 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1028 * respectively, with an error less than 1%. The actual rates are determined 1029 * by 1030 * 1031 * div = round(freq / (2 x prescale x request)) 1032 * actual = freq / (2 x prescale x div) 1033 * 1034 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1035 * or 1 otherwise. 1036 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1037 * otherwise. 1038 */ 1039 static void cp210x_change_speed(struct tty_struct *tty, 1040 struct usb_serial_port *port, struct ktermios *old_termios) 1041 { 1042 u32 baud; 1043 1044 baud = tty->termios.c_ospeed; 1045 1046 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 1047 * or to an arbitrary rate in [1M,2M]. 1048 * 1049 * NOTE: B0 is not implemented. 1050 */ 1051 baud = cp210x_quantise_baudrate(baud); 1052 1053 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1054 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1055 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1056 if (old_termios) 1057 baud = old_termios->c_ospeed; 1058 else 1059 baud = 9600; 1060 } 1061 1062 tty_encode_baud_rate(tty, baud, baud); 1063 } 1064 1065 static void cp210x_set_termios(struct tty_struct *tty, 1066 struct usb_serial_port *port, struct ktermios *old_termios) 1067 { 1068 struct device *dev = &port->dev; 1069 unsigned int cflag, old_cflag; 1070 u16 bits; 1071 1072 cflag = tty->termios.c_cflag; 1073 old_cflag = old_termios->c_cflag; 1074 1075 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1076 cp210x_change_speed(tty, port, old_termios); 1077 1078 /* If the number of data bits is to be updated */ 1079 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1080 cp210x_get_line_ctl(port, &bits); 1081 bits &= ~BITS_DATA_MASK; 1082 switch (cflag & CSIZE) { 1083 case CS5: 1084 bits |= BITS_DATA_5; 1085 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1086 break; 1087 case CS6: 1088 bits |= BITS_DATA_6; 1089 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1090 break; 1091 case CS7: 1092 bits |= BITS_DATA_7; 1093 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1094 break; 1095 case CS8: 1096 default: 1097 bits |= BITS_DATA_8; 1098 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1099 break; 1100 } 1101 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1102 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1103 } 1104 1105 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1106 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1107 cp210x_get_line_ctl(port, &bits); 1108 bits &= ~BITS_PARITY_MASK; 1109 if (cflag & PARENB) { 1110 if (cflag & CMSPAR) { 1111 if (cflag & PARODD) { 1112 bits |= BITS_PARITY_MARK; 1113 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1114 } else { 1115 bits |= BITS_PARITY_SPACE; 1116 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1117 } 1118 } else { 1119 if (cflag & PARODD) { 1120 bits |= BITS_PARITY_ODD; 1121 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1122 } else { 1123 bits |= BITS_PARITY_EVEN; 1124 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1125 } 1126 } 1127 } 1128 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1129 dev_dbg(dev, "Parity mode not supported by device\n"); 1130 } 1131 1132 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1133 cp210x_get_line_ctl(port, &bits); 1134 bits &= ~BITS_STOP_MASK; 1135 if (cflag & CSTOPB) { 1136 bits |= BITS_STOP_2; 1137 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1138 } else { 1139 bits |= BITS_STOP_1; 1140 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1141 } 1142 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1143 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1144 } 1145 1146 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1147 struct cp210x_flow_ctl flow_ctl; 1148 u32 ctl_hs; 1149 u32 flow_repl; 1150 1151 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1152 sizeof(flow_ctl)); 1153 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1154 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1155 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1156 __func__, ctl_hs, flow_repl); 1157 1158 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1159 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1160 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1161 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1162 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1163 if (cflag & CRTSCTS) { 1164 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1165 1166 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1167 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1168 CP210X_SERIAL_RTS_FLOW_CTL); 1169 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1170 } else { 1171 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1172 1173 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1174 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1175 CP210X_SERIAL_RTS_ACTIVE); 1176 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1177 } 1178 1179 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1180 __func__, ctl_hs, flow_repl); 1181 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1182 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1183 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1184 sizeof(flow_ctl)); 1185 } 1186 1187 } 1188 1189 static int cp210x_tiocmset(struct tty_struct *tty, 1190 unsigned int set, unsigned int clear) 1191 { 1192 struct usb_serial_port *port = tty->driver_data; 1193 return cp210x_tiocmset_port(port, set, clear); 1194 } 1195 1196 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1197 unsigned int set, unsigned int clear) 1198 { 1199 u16 control = 0; 1200 1201 if (set & TIOCM_RTS) { 1202 control |= CONTROL_RTS; 1203 control |= CONTROL_WRITE_RTS; 1204 } 1205 if (set & TIOCM_DTR) { 1206 control |= CONTROL_DTR; 1207 control |= CONTROL_WRITE_DTR; 1208 } 1209 if (clear & TIOCM_RTS) { 1210 control &= ~CONTROL_RTS; 1211 control |= CONTROL_WRITE_RTS; 1212 } 1213 if (clear & TIOCM_DTR) { 1214 control &= ~CONTROL_DTR; 1215 control |= CONTROL_WRITE_DTR; 1216 } 1217 1218 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1219 1220 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1221 } 1222 1223 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1224 { 1225 if (on) 1226 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1227 else 1228 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1229 } 1230 1231 static int cp210x_tiocmget(struct tty_struct *tty) 1232 { 1233 struct usb_serial_port *port = tty->driver_data; 1234 u8 control; 1235 int result; 1236 1237 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1238 if (result) 1239 return result; 1240 1241 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1242 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1243 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1244 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1245 |((control & CONTROL_RING)? TIOCM_RI : 0) 1246 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1247 1248 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1249 1250 return result; 1251 } 1252 1253 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1254 { 1255 struct usb_serial_port *port = tty->driver_data; 1256 u16 state; 1257 1258 if (break_state == 0) 1259 state = BREAK_OFF; 1260 else 1261 state = BREAK_ON; 1262 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1263 state == BREAK_OFF ? "off" : "on"); 1264 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1265 } 1266 1267 #ifdef CONFIG_GPIOLIB 1268 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1269 { 1270 struct usb_serial *serial = gpiochip_get_data(gc); 1271 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1272 1273 switch (offset) { 1274 case 0: 1275 if (priv->config & CP2105_GPIO0_TXLED_MODE) 1276 return -ENODEV; 1277 break; 1278 case 1: 1279 if (priv->config & (CP2105_GPIO1_RXLED_MODE | 1280 CP2105_GPIO1_RS485_MODE)) 1281 return -ENODEV; 1282 break; 1283 } 1284 1285 return 0; 1286 } 1287 1288 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1289 { 1290 struct usb_serial *serial = gpiochip_get_data(gc); 1291 int result; 1292 u8 buf; 1293 1294 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST, 1295 CP210X_READ_LATCH, &buf, sizeof(buf)); 1296 if (result < 0) 1297 return result; 1298 1299 return !!(buf & BIT(gpio)); 1300 } 1301 1302 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1303 { 1304 struct usb_serial *serial = gpiochip_get_data(gc); 1305 struct cp210x_gpio_write buf; 1306 1307 if (value == 1) 1308 buf.state = BIT(gpio); 1309 else 1310 buf.state = 0; 1311 1312 buf.mask = BIT(gpio); 1313 1314 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE, 1315 CP210X_WRITE_LATCH, &buf, sizeof(buf)); 1316 } 1317 1318 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1319 { 1320 /* Hardware does not support an input mode */ 1321 return 0; 1322 } 1323 1324 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1325 { 1326 /* Hardware does not support an input mode */ 1327 return -ENOTSUPP; 1328 } 1329 1330 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1331 int value) 1332 { 1333 return 0; 1334 } 1335 1336 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1337 unsigned long config) 1338 { 1339 struct usb_serial *serial = gpiochip_get_data(gc); 1340 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1341 enum pin_config_param param = pinconf_to_config_param(config); 1342 1343 /* Succeed only if in correct mode (this can't be set at runtime) */ 1344 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1345 (priv->gpio_mode & BIT(gpio))) 1346 return 0; 1347 1348 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1349 !(priv->gpio_mode & BIT(gpio))) 1350 return 0; 1351 1352 return -ENOTSUPP; 1353 } 1354 1355 /* 1356 * This function is for configuring GPIO using shared pins, where other signals 1357 * are made unavailable by configuring the use of GPIO. This is believed to be 1358 * only applicable to the cp2105 at this point, the other devices supported by 1359 * this driver that provide GPIO do so in a way that does not impact other 1360 * signals and are thus expected to have very different initialisation. 1361 */ 1362 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1363 { 1364 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1365 struct cp210x_pin_mode mode; 1366 struct cp210x_config config; 1367 u8 intf_num = cp210x_interface_num(serial); 1368 int result; 1369 1370 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1371 CP210X_GET_DEVICEMODE, &mode, 1372 sizeof(mode)); 1373 if (result < 0) 1374 return result; 1375 1376 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1377 CP210X_GET_PORTCONFIG, &config, 1378 sizeof(config)); 1379 if (result < 0) 1380 return result; 1381 1382 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1383 if (intf_num == 0) { 1384 if (mode.eci == CP210X_PIN_MODE_MODEM) 1385 return 0; 1386 1387 priv->config = config.eci_cfg; 1388 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1389 CP210X_ECI_GPIO_MODE_MASK) >> 1390 CP210X_ECI_GPIO_MODE_OFFSET); 1391 priv->gc.ngpio = 2; 1392 } else if (intf_num == 1) { 1393 if (mode.sci == CP210X_PIN_MODE_MODEM) 1394 return 0; 1395 1396 priv->config = config.sci_cfg; 1397 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1398 CP210X_SCI_GPIO_MODE_MASK) >> 1399 CP210X_SCI_GPIO_MODE_OFFSET); 1400 priv->gc.ngpio = 3; 1401 } else { 1402 return -ENODEV; 1403 } 1404 1405 priv->gc.label = "cp210x"; 1406 priv->gc.request = cp210x_gpio_request; 1407 priv->gc.get_direction = cp210x_gpio_direction_get; 1408 priv->gc.direction_input = cp210x_gpio_direction_input; 1409 priv->gc.direction_output = cp210x_gpio_direction_output; 1410 priv->gc.get = cp210x_gpio_get; 1411 priv->gc.set = cp210x_gpio_set; 1412 priv->gc.set_config = cp210x_gpio_set_config; 1413 priv->gc.owner = THIS_MODULE; 1414 priv->gc.parent = &serial->interface->dev; 1415 priv->gc.base = -1; 1416 priv->gc.can_sleep = true; 1417 1418 result = gpiochip_add_data(&priv->gc, serial); 1419 if (!result) 1420 priv->gpio_registered = true; 1421 1422 return result; 1423 } 1424 1425 static void cp210x_gpio_remove(struct usb_serial *serial) 1426 { 1427 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1428 1429 if (priv->gpio_registered) { 1430 gpiochip_remove(&priv->gc); 1431 priv->gpio_registered = false; 1432 } 1433 } 1434 1435 #else 1436 1437 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1438 { 1439 return 0; 1440 } 1441 1442 static void cp210x_gpio_remove(struct usb_serial *serial) 1443 { 1444 /* Nothing to do */ 1445 } 1446 1447 #endif 1448 1449 static int cp210x_port_probe(struct usb_serial_port *port) 1450 { 1451 struct usb_serial *serial = port->serial; 1452 struct cp210x_port_private *port_priv; 1453 int ret; 1454 1455 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1456 if (!port_priv) 1457 return -ENOMEM; 1458 1459 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1460 1461 usb_set_serial_port_data(port, port_priv); 1462 1463 ret = cp210x_detect_swapped_line_ctl(port); 1464 if (ret) { 1465 kfree(port_priv); 1466 return ret; 1467 } 1468 1469 return 0; 1470 } 1471 1472 static int cp210x_port_remove(struct usb_serial_port *port) 1473 { 1474 struct cp210x_port_private *port_priv; 1475 1476 port_priv = usb_get_serial_port_data(port); 1477 kfree(port_priv); 1478 1479 return 0; 1480 } 1481 1482 static int cp210x_attach(struct usb_serial *serial) 1483 { 1484 int result; 1485 struct cp210x_serial_private *priv; 1486 1487 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1488 if (!priv) 1489 return -ENOMEM; 1490 1491 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1492 CP210X_GET_PARTNUM, &priv->partnum, 1493 sizeof(priv->partnum)); 1494 if (result < 0) 1495 goto err_free_priv; 1496 1497 usb_set_serial_data(serial, priv); 1498 1499 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1500 result = cp2105_shared_gpio_init(serial); 1501 if (result < 0) { 1502 dev_err(&serial->interface->dev, 1503 "GPIO initialisation failed, continuing without GPIO support\n"); 1504 } 1505 } 1506 1507 return 0; 1508 err_free_priv: 1509 kfree(priv); 1510 1511 return result; 1512 } 1513 1514 static void cp210x_disconnect(struct usb_serial *serial) 1515 { 1516 cp210x_gpio_remove(serial); 1517 } 1518 1519 static void cp210x_release(struct usb_serial *serial) 1520 { 1521 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1522 1523 cp210x_gpio_remove(serial); 1524 1525 kfree(priv); 1526 } 1527 1528 module_usb_serial_driver(serial_drivers, id_table); 1529 1530 MODULE_DESCRIPTION(DRIVER_DESC); 1531 MODULE_LICENSE("GPL"); 1532