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