1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 4 * 5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 6 * 7 * Support to set flow control line levels using TIOCMGET and TIOCMSET 8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 9 * control thanks to Munir Nassar nassarmu@real-time.com 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/tty.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/usb.h> 21 #include <linux/uaccess.h> 22 #include <linux/usb/serial.h> 23 #include <linux/gpio/driver.h> 24 #include <linux/bitops.h> 25 #include <linux/mutex.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 tcflag_t *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_attach(struct usb_serial *); 48 static void cp210x_disconnect(struct usb_serial *); 49 static void cp210x_release(struct usb_serial *); 50 static int cp210x_port_probe(struct usb_serial_port *); 51 static int cp210x_port_remove(struct usb_serial_port *); 52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 53 54 static const struct usb_device_id id_table[] = { 55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 63 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 64 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 94 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 95 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 96 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 97 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 98 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 99 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 100 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 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, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 119 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 120 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 121 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 122 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 123 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 124 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 125 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 126 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 127 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 128 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 129 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 130 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 131 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 132 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 133 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 134 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 135 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 136 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 137 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 138 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 139 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 140 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 141 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 142 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 143 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 144 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 145 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 146 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 147 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 148 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 149 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 150 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 151 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 152 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 153 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 154 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 155 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 156 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 157 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 158 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 159 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 160 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 161 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 162 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 163 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 164 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 165 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 166 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 167 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 168 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 169 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 170 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 171 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 172 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 173 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 174 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 175 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 176 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 177 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 178 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 179 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 180 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 181 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 182 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 183 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 184 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 185 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 186 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 187 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 188 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 189 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 190 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 191 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 192 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 193 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 194 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 195 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 196 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 197 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 198 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 199 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 200 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 201 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 202 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 203 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 204 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 205 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 206 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 207 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 208 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 209 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 210 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 211 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 212 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 213 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 214 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 215 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 216 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 217 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 218 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 219 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 220 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 221 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 224 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 225 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 226 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 227 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 228 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 229 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 230 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 231 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 232 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 233 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 234 { } /* Terminating Entry */ 235 }; 236 237 MODULE_DEVICE_TABLE(usb, id_table); 238 239 struct cp210x_serial_private { 240 #ifdef CONFIG_GPIOLIB 241 struct gpio_chip gc; 242 u8 config; 243 u8 gpio_mode; 244 bool gpio_registered; 245 #endif 246 u8 partnum; 247 }; 248 249 struct cp210x_port_private { 250 __u8 bInterfaceNumber; 251 bool has_swapped_line_ctl; 252 }; 253 254 static struct usb_serial_driver cp210x_device = { 255 .driver = { 256 .owner = THIS_MODULE, 257 .name = "cp210x", 258 }, 259 .id_table = id_table, 260 .num_ports = 1, 261 .bulk_in_size = 256, 262 .bulk_out_size = 256, 263 .open = cp210x_open, 264 .close = cp210x_close, 265 .break_ctl = cp210x_break_ctl, 266 .set_termios = cp210x_set_termios, 267 .tx_empty = cp210x_tx_empty, 268 .tiocmget = cp210x_tiocmget, 269 .tiocmset = cp210x_tiocmset, 270 .attach = cp210x_attach, 271 .disconnect = cp210x_disconnect, 272 .release = cp210x_release, 273 .port_probe = cp210x_port_probe, 274 .port_remove = cp210x_port_remove, 275 .dtr_rts = cp210x_dtr_rts 276 }; 277 278 static struct usb_serial_driver * const serial_drivers[] = { 279 &cp210x_device, NULL 280 }; 281 282 /* Config request types */ 283 #define REQTYPE_HOST_TO_INTERFACE 0x41 284 #define REQTYPE_INTERFACE_TO_HOST 0xc1 285 #define REQTYPE_HOST_TO_DEVICE 0x40 286 #define REQTYPE_DEVICE_TO_HOST 0xc0 287 288 /* Config request codes */ 289 #define CP210X_IFC_ENABLE 0x00 290 #define CP210X_SET_BAUDDIV 0x01 291 #define CP210X_GET_BAUDDIV 0x02 292 #define CP210X_SET_LINE_CTL 0x03 293 #define CP210X_GET_LINE_CTL 0x04 294 #define CP210X_SET_BREAK 0x05 295 #define CP210X_IMM_CHAR 0x06 296 #define CP210X_SET_MHS 0x07 297 #define CP210X_GET_MDMSTS 0x08 298 #define CP210X_SET_XON 0x09 299 #define CP210X_SET_XOFF 0x0A 300 #define CP210X_SET_EVENTMASK 0x0B 301 #define CP210X_GET_EVENTMASK 0x0C 302 #define CP210X_SET_CHAR 0x0D 303 #define CP210X_GET_CHARS 0x0E 304 #define CP210X_GET_PROPS 0x0F 305 #define CP210X_GET_COMM_STATUS 0x10 306 #define CP210X_RESET 0x11 307 #define CP210X_PURGE 0x12 308 #define CP210X_SET_FLOW 0x13 309 #define CP210X_GET_FLOW 0x14 310 #define CP210X_EMBED_EVENTS 0x15 311 #define CP210X_GET_EVENTSTATE 0x16 312 #define CP210X_SET_CHARS 0x19 313 #define CP210X_GET_BAUDRATE 0x1D 314 #define CP210X_SET_BAUDRATE 0x1E 315 #define CP210X_VENDOR_SPECIFIC 0xFF 316 317 /* CP210X_IFC_ENABLE */ 318 #define UART_ENABLE 0x0001 319 #define UART_DISABLE 0x0000 320 321 /* CP210X_(SET|GET)_BAUDDIV */ 322 #define BAUD_RATE_GEN_FREQ 0x384000 323 324 /* CP210X_(SET|GET)_LINE_CTL */ 325 #define BITS_DATA_MASK 0X0f00 326 #define BITS_DATA_5 0X0500 327 #define BITS_DATA_6 0X0600 328 #define BITS_DATA_7 0X0700 329 #define BITS_DATA_8 0X0800 330 #define BITS_DATA_9 0X0900 331 332 #define BITS_PARITY_MASK 0x00f0 333 #define BITS_PARITY_NONE 0x0000 334 #define BITS_PARITY_ODD 0x0010 335 #define BITS_PARITY_EVEN 0x0020 336 #define BITS_PARITY_MARK 0x0030 337 #define BITS_PARITY_SPACE 0x0040 338 339 #define BITS_STOP_MASK 0x000f 340 #define BITS_STOP_1 0x0000 341 #define BITS_STOP_1_5 0x0001 342 #define BITS_STOP_2 0x0002 343 344 /* CP210X_SET_BREAK */ 345 #define BREAK_ON 0x0001 346 #define BREAK_OFF 0x0000 347 348 /* CP210X_(SET_MHS|GET_MDMSTS) */ 349 #define CONTROL_DTR 0x0001 350 #define CONTROL_RTS 0x0002 351 #define CONTROL_CTS 0x0010 352 #define CONTROL_DSR 0x0020 353 #define CONTROL_RING 0x0040 354 #define CONTROL_DCD 0x0080 355 #define CONTROL_WRITE_DTR 0x0100 356 #define CONTROL_WRITE_RTS 0x0200 357 358 /* CP210X_VENDOR_SPECIFIC values */ 359 #define CP210X_READ_LATCH 0x00C2 360 #define CP210X_GET_PARTNUM 0x370B 361 #define CP210X_GET_PORTCONFIG 0x370C 362 #define CP210X_GET_DEVICEMODE 0x3711 363 #define CP210X_WRITE_LATCH 0x37E1 364 365 /* Part number definitions */ 366 #define CP210X_PARTNUM_CP2101 0x01 367 #define CP210X_PARTNUM_CP2102 0x02 368 #define CP210X_PARTNUM_CP2103 0x03 369 #define CP210X_PARTNUM_CP2104 0x04 370 #define CP210X_PARTNUM_CP2105 0x05 371 #define CP210X_PARTNUM_CP2108 0x08 372 #define CP210X_PARTNUM_UNKNOWN 0xFF 373 374 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 375 struct cp210x_comm_status { 376 __le32 ulErrors; 377 __le32 ulHoldReasons; 378 __le32 ulAmountInInQueue; 379 __le32 ulAmountInOutQueue; 380 u8 bEofReceived; 381 u8 bWaitForImmediate; 382 u8 bReserved; 383 } __packed; 384 385 /* 386 * CP210X_PURGE - 16 bits passed in wValue of USB request. 387 * SiLabs app note AN571 gives a strange description of the 4 bits: 388 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 389 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 390 */ 391 #define PURGE_ALL 0x000f 392 393 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 394 struct cp210x_flow_ctl { 395 __le32 ulControlHandshake; 396 __le32 ulFlowReplace; 397 __le32 ulXonLimit; 398 __le32 ulXoffLimit; 399 } __packed; 400 401 /* cp210x_flow_ctl::ulControlHandshake */ 402 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 403 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 404 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 405 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 406 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 407 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 408 409 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 410 #define CP210X_SERIAL_DTR_INACTIVE 0 411 #define CP210X_SERIAL_DTR_ACTIVE 1 412 #define CP210X_SERIAL_DTR_FLOW_CTL 2 413 414 /* cp210x_flow_ctl::ulFlowReplace */ 415 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 416 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 417 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 418 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 419 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 420 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 421 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 422 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 423 424 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 425 #define CP210X_SERIAL_RTS_INACTIVE 0 426 #define CP210X_SERIAL_RTS_ACTIVE 1 427 #define CP210X_SERIAL_RTS_FLOW_CTL 2 428 429 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 430 struct cp210x_pin_mode { 431 u8 eci; 432 u8 sci; 433 } __packed; 434 435 #define CP210X_PIN_MODE_MODEM 0 436 #define CP210X_PIN_MODE_GPIO BIT(0) 437 438 /* 439 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes. 440 * Structure needs padding due to unused/unspecified bytes. 441 */ 442 struct cp210x_config { 443 __le16 gpio_mode; 444 u8 __pad0[2]; 445 __le16 reset_state; 446 u8 __pad1[4]; 447 __le16 suspend_state; 448 u8 sci_cfg; 449 u8 eci_cfg; 450 u8 device_cfg; 451 } __packed; 452 453 /* GPIO modes */ 454 #define CP210X_SCI_GPIO_MODE_OFFSET 9 455 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 456 457 #define CP210X_ECI_GPIO_MODE_OFFSET 2 458 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 459 460 /* CP2105 port configuration values */ 461 #define CP2105_GPIO0_TXLED_MODE BIT(0) 462 #define CP2105_GPIO1_RXLED_MODE BIT(1) 463 #define CP2105_GPIO1_RS485_MODE BIT(2) 464 465 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 466 struct cp210x_gpio_write { 467 u8 mask; 468 u8 state; 469 } __packed; 470 471 /* 472 * Helper to get interface number when we only have struct usb_serial. 473 */ 474 static u8 cp210x_interface_num(struct usb_serial *serial) 475 { 476 struct usb_host_interface *cur_altsetting; 477 478 cur_altsetting = serial->interface->cur_altsetting; 479 480 return cur_altsetting->desc.bInterfaceNumber; 481 } 482 483 /* 484 * Reads a variable-sized block of CP210X_ registers, identified by req. 485 * Returns data into buf in native USB byte order. 486 */ 487 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 488 void *buf, int bufsize) 489 { 490 struct usb_serial *serial = port->serial; 491 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 492 void *dmabuf; 493 int result; 494 495 dmabuf = kmalloc(bufsize, GFP_KERNEL); 496 if (!dmabuf) { 497 /* 498 * FIXME Some callers don't bother to check for error, 499 * at least give them consistent junk until they are fixed 500 */ 501 memset(buf, 0, bufsize); 502 return -ENOMEM; 503 } 504 505 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 506 req, REQTYPE_INTERFACE_TO_HOST, 0, 507 port_priv->bInterfaceNumber, dmabuf, bufsize, 508 USB_CTRL_SET_TIMEOUT); 509 if (result == bufsize) { 510 memcpy(buf, dmabuf, bufsize); 511 result = 0; 512 } else { 513 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 514 req, bufsize, result); 515 if (result >= 0) 516 result = -EIO; 517 518 /* 519 * FIXME Some callers don't bother to check for error, 520 * at least give them consistent junk until they are fixed 521 */ 522 memset(buf, 0, bufsize); 523 } 524 525 kfree(dmabuf); 526 527 return result; 528 } 529 530 /* 531 * Reads any 32-bit CP210X_ register identified by req. 532 */ 533 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 534 { 535 __le32 le32_val; 536 int err; 537 538 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 539 if (err) { 540 /* 541 * FIXME Some callers don't bother to check for error, 542 * at least give them consistent junk until they are fixed 543 */ 544 *val = 0; 545 return err; 546 } 547 548 *val = le32_to_cpu(le32_val); 549 550 return 0; 551 } 552 553 /* 554 * Reads any 16-bit CP210X_ register identified by req. 555 */ 556 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 557 { 558 __le16 le16_val; 559 int err; 560 561 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 562 if (err) 563 return err; 564 565 *val = le16_to_cpu(le16_val); 566 567 return 0; 568 } 569 570 /* 571 * Reads any 8-bit CP210X_ register identified by req. 572 */ 573 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 574 { 575 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 576 } 577 578 /* 579 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 580 * Returns data into buf in native USB byte order. 581 */ 582 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 583 void *buf, int bufsize) 584 { 585 void *dmabuf; 586 int result; 587 588 dmabuf = kmalloc(bufsize, GFP_KERNEL); 589 if (!dmabuf) 590 return -ENOMEM; 591 592 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 593 CP210X_VENDOR_SPECIFIC, type, val, 594 cp210x_interface_num(serial), dmabuf, bufsize, 595 USB_CTRL_GET_TIMEOUT); 596 if (result == bufsize) { 597 memcpy(buf, dmabuf, bufsize); 598 result = 0; 599 } else { 600 dev_err(&serial->interface->dev, 601 "failed to get vendor val 0x%04x size %d: %d\n", val, 602 bufsize, result); 603 if (result >= 0) 604 result = -EIO; 605 } 606 607 kfree(dmabuf); 608 609 return result; 610 } 611 612 /* 613 * Writes any 16-bit CP210X_ register (req) whose value is passed 614 * entirely in the wValue field of the USB request. 615 */ 616 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 617 { 618 struct usb_serial *serial = port->serial; 619 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 620 int result; 621 622 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 623 req, REQTYPE_HOST_TO_INTERFACE, val, 624 port_priv->bInterfaceNumber, NULL, 0, 625 USB_CTRL_SET_TIMEOUT); 626 if (result < 0) { 627 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 628 req, result); 629 } 630 631 return result; 632 } 633 634 /* 635 * Writes a variable-sized block of CP210X_ registers, identified by req. 636 * Data in buf must be in native USB byte order. 637 */ 638 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 639 void *buf, int bufsize) 640 { 641 struct usb_serial *serial = port->serial; 642 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 643 void *dmabuf; 644 int result; 645 646 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 647 if (!dmabuf) 648 return -ENOMEM; 649 650 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 651 req, REQTYPE_HOST_TO_INTERFACE, 0, 652 port_priv->bInterfaceNumber, dmabuf, bufsize, 653 USB_CTRL_SET_TIMEOUT); 654 655 kfree(dmabuf); 656 657 if (result == bufsize) { 658 result = 0; 659 } else { 660 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 661 req, bufsize, result); 662 if (result >= 0) 663 result = -EIO; 664 } 665 666 return result; 667 } 668 669 /* 670 * Writes any 32-bit CP210X_ register identified by req. 671 */ 672 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 673 { 674 __le32 le32_val; 675 676 le32_val = cpu_to_le32(val); 677 678 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 679 } 680 681 #ifdef CONFIG_GPIOLIB 682 /* 683 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 684 * Data in buf must be in native USB byte order. 685 */ 686 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 687 u16 val, void *buf, int bufsize) 688 { 689 void *dmabuf; 690 int result; 691 692 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 693 if (!dmabuf) 694 return -ENOMEM; 695 696 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 697 CP210X_VENDOR_SPECIFIC, type, val, 698 cp210x_interface_num(serial), dmabuf, bufsize, 699 USB_CTRL_SET_TIMEOUT); 700 701 kfree(dmabuf); 702 703 if (result == bufsize) { 704 result = 0; 705 } else { 706 dev_err(&serial->interface->dev, 707 "failed to set vendor val 0x%04x size %d: %d\n", val, 708 bufsize, result); 709 if (result >= 0) 710 result = -EIO; 711 } 712 713 return result; 714 } 715 #endif 716 717 /* 718 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 719 * Write a known good value 0x800, read it back. 720 * If it comes back swapped the bug is detected. 721 * Preserve the original register value. 722 */ 723 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 724 { 725 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 726 u16 line_ctl_save; 727 u16 line_ctl_test; 728 int err; 729 730 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 731 if (err) 732 return err; 733 734 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 735 if (err) 736 return err; 737 738 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 739 if (err) 740 return err; 741 742 if (line_ctl_test == 8) { 743 port_priv->has_swapped_line_ctl = true; 744 line_ctl_save = swab16(line_ctl_save); 745 } 746 747 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 748 } 749 750 /* 751 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 752 * to workaround cp2108 bug and get correct value. 753 */ 754 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 755 { 756 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 757 int err; 758 759 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 760 if (err) 761 return err; 762 763 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 764 if (port_priv->has_swapped_line_ctl) 765 *ctl = swab16(*ctl); 766 767 return 0; 768 } 769 770 /* 771 * cp210x_quantise_baudrate 772 * Quantises the baud rate as per AN205 Table 1 773 */ 774 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 775 { 776 if (baud <= 300) 777 baud = 300; 778 else if (baud <= 600) baud = 600; 779 else if (baud <= 1200) baud = 1200; 780 else if (baud <= 1800) baud = 1800; 781 else if (baud <= 2400) baud = 2400; 782 else if (baud <= 4000) baud = 4000; 783 else if (baud <= 4803) baud = 4800; 784 else if (baud <= 7207) baud = 7200; 785 else if (baud <= 9612) baud = 9600; 786 else if (baud <= 14428) baud = 14400; 787 else if (baud <= 16062) baud = 16000; 788 else if (baud <= 19250) baud = 19200; 789 else if (baud <= 28912) baud = 28800; 790 else if (baud <= 38601) baud = 38400; 791 else if (baud <= 51558) baud = 51200; 792 else if (baud <= 56280) baud = 56000; 793 else if (baud <= 58053) baud = 57600; 794 else if (baud <= 64111) baud = 64000; 795 else if (baud <= 77608) baud = 76800; 796 else if (baud <= 117028) baud = 115200; 797 else if (baud <= 129347) baud = 128000; 798 else if (baud <= 156868) baud = 153600; 799 else if (baud <= 237832) baud = 230400; 800 else if (baud <= 254234) baud = 250000; 801 else if (baud <= 273066) baud = 256000; 802 else if (baud <= 491520) baud = 460800; 803 else if (baud <= 567138) baud = 500000; 804 else if (baud <= 670254) baud = 576000; 805 else if (baud < 1000000) 806 baud = 921600; 807 else if (baud > 2000000) 808 baud = 2000000; 809 return baud; 810 } 811 812 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 813 { 814 int result; 815 816 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 817 if (result) { 818 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 819 return result; 820 } 821 822 /* Configure the termios structure */ 823 cp210x_get_termios(tty, port); 824 825 /* The baud rate must be initialised on cp2104 */ 826 if (tty) 827 cp210x_change_speed(tty, port, NULL); 828 829 return usb_serial_generic_open(tty, port); 830 } 831 832 static void cp210x_close(struct usb_serial_port *port) 833 { 834 usb_serial_generic_close(port); 835 836 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 837 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 838 839 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 840 } 841 842 /* 843 * Read how many bytes are waiting in the TX queue. 844 */ 845 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 846 u32 *count) 847 { 848 struct usb_serial *serial = port->serial; 849 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 850 struct cp210x_comm_status *sts; 851 int result; 852 853 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 854 if (!sts) 855 return -ENOMEM; 856 857 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 858 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 859 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 860 USB_CTRL_GET_TIMEOUT); 861 if (result == sizeof(*sts)) { 862 *count = le32_to_cpu(sts->ulAmountInOutQueue); 863 result = 0; 864 } else { 865 dev_err(&port->dev, "failed to get comm status: %d\n", result); 866 if (result >= 0) 867 result = -EIO; 868 } 869 870 kfree(sts); 871 872 return result; 873 } 874 875 static bool cp210x_tx_empty(struct usb_serial_port *port) 876 { 877 int err; 878 u32 count; 879 880 err = cp210x_get_tx_queue_byte_count(port, &count); 881 if (err) 882 return true; 883 884 return !count; 885 } 886 887 /* 888 * cp210x_get_termios 889 * Reads the baud rate, data bits, parity, stop bits and flow control mode 890 * from the device, corrects any unsupported values, and configures the 891 * termios structure to reflect the state of the device 892 */ 893 static void cp210x_get_termios(struct tty_struct *tty, 894 struct usb_serial_port *port) 895 { 896 unsigned int baud; 897 898 if (tty) { 899 cp210x_get_termios_port(tty->driver_data, 900 &tty->termios.c_cflag, &baud); 901 tty_encode_baud_rate(tty, baud, baud); 902 } else { 903 tcflag_t cflag; 904 cflag = 0; 905 cp210x_get_termios_port(port, &cflag, &baud); 906 } 907 } 908 909 /* 910 * cp210x_get_termios_port 911 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 912 */ 913 static void cp210x_get_termios_port(struct usb_serial_port *port, 914 tcflag_t *cflagp, unsigned int *baudp) 915 { 916 struct device *dev = &port->dev; 917 tcflag_t cflag; 918 struct cp210x_flow_ctl flow_ctl; 919 u32 baud; 920 u16 bits; 921 u32 ctl_hs; 922 923 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 924 925 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 926 *baudp = baud; 927 928 cflag = *cflagp; 929 930 cp210x_get_line_ctl(port, &bits); 931 cflag &= ~CSIZE; 932 switch (bits & BITS_DATA_MASK) { 933 case BITS_DATA_5: 934 dev_dbg(dev, "%s - data bits = 5\n", __func__); 935 cflag |= CS5; 936 break; 937 case BITS_DATA_6: 938 dev_dbg(dev, "%s - data bits = 6\n", __func__); 939 cflag |= CS6; 940 break; 941 case BITS_DATA_7: 942 dev_dbg(dev, "%s - data bits = 7\n", __func__); 943 cflag |= CS7; 944 break; 945 case BITS_DATA_8: 946 dev_dbg(dev, "%s - data bits = 8\n", __func__); 947 cflag |= CS8; 948 break; 949 case BITS_DATA_9: 950 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 951 cflag |= CS8; 952 bits &= ~BITS_DATA_MASK; 953 bits |= BITS_DATA_8; 954 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 955 break; 956 default: 957 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 958 cflag |= CS8; 959 bits &= ~BITS_DATA_MASK; 960 bits |= BITS_DATA_8; 961 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 962 break; 963 } 964 965 switch (bits & BITS_PARITY_MASK) { 966 case BITS_PARITY_NONE: 967 dev_dbg(dev, "%s - parity = NONE\n", __func__); 968 cflag &= ~PARENB; 969 break; 970 case BITS_PARITY_ODD: 971 dev_dbg(dev, "%s - parity = ODD\n", __func__); 972 cflag |= (PARENB|PARODD); 973 break; 974 case BITS_PARITY_EVEN: 975 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 976 cflag &= ~PARODD; 977 cflag |= PARENB; 978 break; 979 case BITS_PARITY_MARK: 980 dev_dbg(dev, "%s - parity = MARK\n", __func__); 981 cflag |= (PARENB|PARODD|CMSPAR); 982 break; 983 case BITS_PARITY_SPACE: 984 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 985 cflag &= ~PARODD; 986 cflag |= (PARENB|CMSPAR); 987 break; 988 default: 989 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 990 cflag &= ~PARENB; 991 bits &= ~BITS_PARITY_MASK; 992 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 993 break; 994 } 995 996 cflag &= ~CSTOPB; 997 switch (bits & BITS_STOP_MASK) { 998 case BITS_STOP_1: 999 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1000 break; 1001 case BITS_STOP_1_5: 1002 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 1003 bits &= ~BITS_STOP_MASK; 1004 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1005 break; 1006 case BITS_STOP_2: 1007 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1008 cflag |= CSTOPB; 1009 break; 1010 default: 1011 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 1012 bits &= ~BITS_STOP_MASK; 1013 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1014 break; 1015 } 1016 1017 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1018 sizeof(flow_ctl)); 1019 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1020 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1021 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1022 cflag |= CRTSCTS; 1023 } else { 1024 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1025 cflag &= ~CRTSCTS; 1026 } 1027 1028 *cflagp = cflag; 1029 } 1030 1031 /* 1032 * CP2101 supports the following baud rates: 1033 * 1034 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1035 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1036 * 1037 * CP2102 and CP2103 support the following additional rates: 1038 * 1039 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1040 * 576000 1041 * 1042 * The device will map a requested rate to a supported one, but the result 1043 * of requests for rates greater than 1053257 is undefined (see AN205). 1044 * 1045 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1046 * respectively, with an error less than 1%. The actual rates are determined 1047 * by 1048 * 1049 * div = round(freq / (2 x prescale x request)) 1050 * actual = freq / (2 x prescale x div) 1051 * 1052 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1053 * or 1 otherwise. 1054 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1055 * otherwise. 1056 */ 1057 static void cp210x_change_speed(struct tty_struct *tty, 1058 struct usb_serial_port *port, struct ktermios *old_termios) 1059 { 1060 u32 baud; 1061 1062 baud = tty->termios.c_ospeed; 1063 1064 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 1065 * or to an arbitrary rate in [1M,2M]. 1066 * 1067 * NOTE: B0 is not implemented. 1068 */ 1069 baud = cp210x_quantise_baudrate(baud); 1070 1071 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1072 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1073 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1074 if (old_termios) 1075 baud = old_termios->c_ospeed; 1076 else 1077 baud = 9600; 1078 } 1079 1080 tty_encode_baud_rate(tty, baud, baud); 1081 } 1082 1083 static void cp210x_set_termios(struct tty_struct *tty, 1084 struct usb_serial_port *port, struct ktermios *old_termios) 1085 { 1086 struct device *dev = &port->dev; 1087 unsigned int cflag, old_cflag; 1088 u16 bits; 1089 1090 cflag = tty->termios.c_cflag; 1091 old_cflag = old_termios->c_cflag; 1092 1093 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1094 cp210x_change_speed(tty, port, old_termios); 1095 1096 /* If the number of data bits is to be updated */ 1097 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1098 cp210x_get_line_ctl(port, &bits); 1099 bits &= ~BITS_DATA_MASK; 1100 switch (cflag & CSIZE) { 1101 case CS5: 1102 bits |= BITS_DATA_5; 1103 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1104 break; 1105 case CS6: 1106 bits |= BITS_DATA_6; 1107 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1108 break; 1109 case CS7: 1110 bits |= BITS_DATA_7; 1111 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1112 break; 1113 case CS8: 1114 default: 1115 bits |= BITS_DATA_8; 1116 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1117 break; 1118 } 1119 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1120 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1121 } 1122 1123 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1124 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1125 cp210x_get_line_ctl(port, &bits); 1126 bits &= ~BITS_PARITY_MASK; 1127 if (cflag & PARENB) { 1128 if (cflag & CMSPAR) { 1129 if (cflag & PARODD) { 1130 bits |= BITS_PARITY_MARK; 1131 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1132 } else { 1133 bits |= BITS_PARITY_SPACE; 1134 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1135 } 1136 } else { 1137 if (cflag & PARODD) { 1138 bits |= BITS_PARITY_ODD; 1139 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1140 } else { 1141 bits |= BITS_PARITY_EVEN; 1142 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1143 } 1144 } 1145 } 1146 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1147 dev_dbg(dev, "Parity mode not supported by device\n"); 1148 } 1149 1150 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1151 cp210x_get_line_ctl(port, &bits); 1152 bits &= ~BITS_STOP_MASK; 1153 if (cflag & CSTOPB) { 1154 bits |= BITS_STOP_2; 1155 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1156 } else { 1157 bits |= BITS_STOP_1; 1158 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1159 } 1160 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1161 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1162 } 1163 1164 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1165 struct cp210x_flow_ctl flow_ctl; 1166 u32 ctl_hs; 1167 u32 flow_repl; 1168 1169 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1170 sizeof(flow_ctl)); 1171 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1172 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1173 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1174 __func__, ctl_hs, flow_repl); 1175 1176 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1177 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1178 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1179 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1180 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1181 if (cflag & CRTSCTS) { 1182 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1183 1184 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1185 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1186 CP210X_SERIAL_RTS_FLOW_CTL); 1187 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1188 } else { 1189 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1190 1191 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1192 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1193 CP210X_SERIAL_RTS_ACTIVE); 1194 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1195 } 1196 1197 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1198 __func__, ctl_hs, flow_repl); 1199 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1200 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1201 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1202 sizeof(flow_ctl)); 1203 } 1204 1205 } 1206 1207 static int cp210x_tiocmset(struct tty_struct *tty, 1208 unsigned int set, unsigned int clear) 1209 { 1210 struct usb_serial_port *port = tty->driver_data; 1211 return cp210x_tiocmset_port(port, set, clear); 1212 } 1213 1214 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1215 unsigned int set, unsigned int clear) 1216 { 1217 u16 control = 0; 1218 1219 if (set & TIOCM_RTS) { 1220 control |= CONTROL_RTS; 1221 control |= CONTROL_WRITE_RTS; 1222 } 1223 if (set & TIOCM_DTR) { 1224 control |= CONTROL_DTR; 1225 control |= CONTROL_WRITE_DTR; 1226 } 1227 if (clear & TIOCM_RTS) { 1228 control &= ~CONTROL_RTS; 1229 control |= CONTROL_WRITE_RTS; 1230 } 1231 if (clear & TIOCM_DTR) { 1232 control &= ~CONTROL_DTR; 1233 control |= CONTROL_WRITE_DTR; 1234 } 1235 1236 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1237 1238 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1239 } 1240 1241 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1242 { 1243 if (on) 1244 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1245 else 1246 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1247 } 1248 1249 static int cp210x_tiocmget(struct tty_struct *tty) 1250 { 1251 struct usb_serial_port *port = tty->driver_data; 1252 u8 control; 1253 int result; 1254 1255 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1256 if (result) 1257 return result; 1258 1259 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1260 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1261 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1262 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1263 |((control & CONTROL_RING)? TIOCM_RI : 0) 1264 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1265 1266 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1267 1268 return result; 1269 } 1270 1271 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1272 { 1273 struct usb_serial_port *port = tty->driver_data; 1274 u16 state; 1275 1276 if (break_state == 0) 1277 state = BREAK_OFF; 1278 else 1279 state = BREAK_ON; 1280 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1281 state == BREAK_OFF ? "off" : "on"); 1282 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1283 } 1284 1285 #ifdef CONFIG_GPIOLIB 1286 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1287 { 1288 struct usb_serial *serial = gpiochip_get_data(gc); 1289 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1290 1291 switch (offset) { 1292 case 0: 1293 if (priv->config & CP2105_GPIO0_TXLED_MODE) 1294 return -ENODEV; 1295 break; 1296 case 1: 1297 if (priv->config & (CP2105_GPIO1_RXLED_MODE | 1298 CP2105_GPIO1_RS485_MODE)) 1299 return -ENODEV; 1300 break; 1301 } 1302 1303 return 0; 1304 } 1305 1306 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1307 { 1308 struct usb_serial *serial = gpiochip_get_data(gc); 1309 int result; 1310 u8 buf; 1311 1312 result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST, 1313 CP210X_READ_LATCH, &buf, sizeof(buf)); 1314 if (result < 0) 1315 return result; 1316 1317 return !!(buf & BIT(gpio)); 1318 } 1319 1320 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1321 { 1322 struct usb_serial *serial = gpiochip_get_data(gc); 1323 struct cp210x_gpio_write buf; 1324 1325 if (value == 1) 1326 buf.state = BIT(gpio); 1327 else 1328 buf.state = 0; 1329 1330 buf.mask = BIT(gpio); 1331 1332 cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE, 1333 CP210X_WRITE_LATCH, &buf, sizeof(buf)); 1334 } 1335 1336 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1337 { 1338 /* Hardware does not support an input mode */ 1339 return 0; 1340 } 1341 1342 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1343 { 1344 /* Hardware does not support an input mode */ 1345 return -ENOTSUPP; 1346 } 1347 1348 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1349 int value) 1350 { 1351 return 0; 1352 } 1353 1354 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1355 unsigned long config) 1356 { 1357 struct usb_serial *serial = gpiochip_get_data(gc); 1358 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1359 enum pin_config_param param = pinconf_to_config_param(config); 1360 1361 /* Succeed only if in correct mode (this can't be set at runtime) */ 1362 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1363 (priv->gpio_mode & BIT(gpio))) 1364 return 0; 1365 1366 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1367 !(priv->gpio_mode & BIT(gpio))) 1368 return 0; 1369 1370 return -ENOTSUPP; 1371 } 1372 1373 /* 1374 * This function is for configuring GPIO using shared pins, where other signals 1375 * are made unavailable by configuring the use of GPIO. This is believed to be 1376 * only applicable to the cp2105 at this point, the other devices supported by 1377 * this driver that provide GPIO do so in a way that does not impact other 1378 * signals and are thus expected to have very different initialisation. 1379 */ 1380 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1381 { 1382 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1383 struct cp210x_pin_mode mode; 1384 struct cp210x_config config; 1385 u8 intf_num = cp210x_interface_num(serial); 1386 int result; 1387 1388 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1389 CP210X_GET_DEVICEMODE, &mode, 1390 sizeof(mode)); 1391 if (result < 0) 1392 return result; 1393 1394 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1395 CP210X_GET_PORTCONFIG, &config, 1396 sizeof(config)); 1397 if (result < 0) 1398 return result; 1399 1400 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1401 if (intf_num == 0) { 1402 if (mode.eci == CP210X_PIN_MODE_MODEM) 1403 return 0; 1404 1405 priv->config = config.eci_cfg; 1406 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1407 CP210X_ECI_GPIO_MODE_MASK) >> 1408 CP210X_ECI_GPIO_MODE_OFFSET); 1409 priv->gc.ngpio = 2; 1410 } else if (intf_num == 1) { 1411 if (mode.sci == CP210X_PIN_MODE_MODEM) 1412 return 0; 1413 1414 priv->config = config.sci_cfg; 1415 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) & 1416 CP210X_SCI_GPIO_MODE_MASK) >> 1417 CP210X_SCI_GPIO_MODE_OFFSET); 1418 priv->gc.ngpio = 3; 1419 } else { 1420 return -ENODEV; 1421 } 1422 1423 priv->gc.label = "cp210x"; 1424 priv->gc.request = cp210x_gpio_request; 1425 priv->gc.get_direction = cp210x_gpio_direction_get; 1426 priv->gc.direction_input = cp210x_gpio_direction_input; 1427 priv->gc.direction_output = cp210x_gpio_direction_output; 1428 priv->gc.get = cp210x_gpio_get; 1429 priv->gc.set = cp210x_gpio_set; 1430 priv->gc.set_config = cp210x_gpio_set_config; 1431 priv->gc.owner = THIS_MODULE; 1432 priv->gc.parent = &serial->interface->dev; 1433 priv->gc.base = -1; 1434 priv->gc.can_sleep = true; 1435 1436 result = gpiochip_add_data(&priv->gc, serial); 1437 if (!result) 1438 priv->gpio_registered = true; 1439 1440 return result; 1441 } 1442 1443 static void cp210x_gpio_remove(struct usb_serial *serial) 1444 { 1445 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1446 1447 if (priv->gpio_registered) { 1448 gpiochip_remove(&priv->gc); 1449 priv->gpio_registered = false; 1450 } 1451 } 1452 1453 #else 1454 1455 static int cp2105_shared_gpio_init(struct usb_serial *serial) 1456 { 1457 return 0; 1458 } 1459 1460 static void cp210x_gpio_remove(struct usb_serial *serial) 1461 { 1462 /* Nothing to do */ 1463 } 1464 1465 #endif 1466 1467 static int cp210x_port_probe(struct usb_serial_port *port) 1468 { 1469 struct usb_serial *serial = port->serial; 1470 struct cp210x_port_private *port_priv; 1471 int ret; 1472 1473 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1474 if (!port_priv) 1475 return -ENOMEM; 1476 1477 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1478 1479 usb_set_serial_port_data(port, port_priv); 1480 1481 ret = cp210x_detect_swapped_line_ctl(port); 1482 if (ret) { 1483 kfree(port_priv); 1484 return ret; 1485 } 1486 1487 return 0; 1488 } 1489 1490 static int cp210x_port_remove(struct usb_serial_port *port) 1491 { 1492 struct cp210x_port_private *port_priv; 1493 1494 port_priv = usb_get_serial_port_data(port); 1495 kfree(port_priv); 1496 1497 return 0; 1498 } 1499 1500 static int cp210x_attach(struct usb_serial *serial) 1501 { 1502 int result; 1503 struct cp210x_serial_private *priv; 1504 1505 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1506 if (!priv) 1507 return -ENOMEM; 1508 1509 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1510 CP210X_GET_PARTNUM, &priv->partnum, 1511 sizeof(priv->partnum)); 1512 if (result < 0) { 1513 dev_warn(&serial->interface->dev, 1514 "querying part number failed\n"); 1515 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1516 } 1517 1518 usb_set_serial_data(serial, priv); 1519 1520 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1521 result = cp2105_shared_gpio_init(serial); 1522 if (result < 0) { 1523 dev_err(&serial->interface->dev, 1524 "GPIO initialisation failed, continuing without GPIO support\n"); 1525 } 1526 } 1527 1528 return 0; 1529 } 1530 1531 static void cp210x_disconnect(struct usb_serial *serial) 1532 { 1533 cp210x_gpio_remove(serial); 1534 } 1535 1536 static void cp210x_release(struct usb_serial *serial) 1537 { 1538 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1539 1540 cp210x_gpio_remove(serial); 1541 1542 kfree(priv); 1543 } 1544 1545 module_usb_serial_driver(serial_drivers, id_table); 1546 1547 MODULE_DESCRIPTION(DRIVER_DESC); 1548 MODULE_LICENSE("GPL v2"); 1549