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 * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org) 7 * 8 * Support to set flow control line levels using TIOCMGET and TIOCMSET 9 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 10 * control thanks to Munir Nassar nassarmu@real-time.com 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/slab.h> 17 #include <linux/tty.h> 18 #include <linux/tty_flip.h> 19 #include <linux/module.h> 20 #include <linux/usb.h> 21 #include <linux/usb/serial.h> 22 #include <linux/gpio/driver.h> 23 #include <linux/bitops.h> 24 #include <linux/mutex.h> 25 26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 27 28 /* 29 * Function Prototypes 30 */ 31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 32 static void cp210x_close(struct usb_serial_port *); 33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 34 struct ktermios *); 35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 36 struct ktermios*); 37 static bool cp210x_tx_empty(struct usb_serial_port *port); 38 static int cp210x_tiocmget(struct tty_struct *); 39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 40 static int cp210x_tiocmset_port(struct usb_serial_port *port, 41 unsigned int, unsigned int); 42 static void cp210x_break_ctl(struct tty_struct *, int); 43 static int cp210x_attach(struct usb_serial *); 44 static void cp210x_disconnect(struct usb_serial *); 45 static void cp210x_release(struct usb_serial *); 46 static int cp210x_port_probe(struct usb_serial_port *); 47 static void cp210x_port_remove(struct usb_serial_port *); 48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on); 49 static void cp210x_process_read_urb(struct urb *urb); 50 static void cp210x_enable_event_mode(struct usb_serial_port *port); 51 static void cp210x_disable_event_mode(struct usb_serial_port *port); 52 53 static const struct usb_device_id id_table[] = { 54 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 55 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 56 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 57 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 59 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 62 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 63 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 64 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 83 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 131 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 132 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 133 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 134 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 135 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 136 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 137 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 138 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 139 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 140 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 141 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 142 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 143 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 144 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 145 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 146 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 147 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 149 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 151 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 152 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 153 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 154 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 155 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 156 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 157 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 158 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 159 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 160 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 161 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 162 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 164 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 165 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 166 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 167 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 168 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 169 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 170 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 171 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 172 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 173 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 174 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 175 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 176 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 177 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 178 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 179 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 180 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 181 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 182 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 183 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 184 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 185 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 186 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 187 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 188 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 189 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 191 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 192 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 193 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 194 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 195 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 196 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 197 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 198 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 199 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 200 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 201 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 202 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 203 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 204 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 205 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 206 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 207 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 208 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 209 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 210 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 211 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 212 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 213 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 214 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 215 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 216 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 217 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 218 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 219 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 220 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 221 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 222 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 223 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 224 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 225 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 226 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 230 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 231 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 232 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 233 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 234 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 235 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 236 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 237 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 238 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 239 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 240 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 241 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 242 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 243 { } /* Terminating Entry */ 244 }; 245 246 MODULE_DEVICE_TABLE(usb, id_table); 247 248 struct cp210x_serial_private { 249 #ifdef CONFIG_GPIOLIB 250 struct gpio_chip gc; 251 bool gpio_registered; 252 u16 gpio_pushpull; 253 u16 gpio_altfunc; 254 u16 gpio_input; 255 #endif 256 u8 partnum; 257 u32 fw_version; 258 speed_t min_speed; 259 speed_t max_speed; 260 bool use_actual_rate; 261 bool no_flow_control; 262 bool no_event_mode; 263 }; 264 265 enum cp210x_event_state { 266 ES_DATA, 267 ES_ESCAPE, 268 ES_LSR, 269 ES_LSR_DATA_0, 270 ES_LSR_DATA_1, 271 ES_MSR 272 }; 273 274 struct cp210x_port_private { 275 u8 bInterfaceNumber; 276 bool event_mode; 277 enum cp210x_event_state event_state; 278 u8 lsr; 279 280 struct mutex mutex; 281 bool crtscts; 282 bool dtr; 283 bool rts; 284 }; 285 286 static struct usb_serial_driver cp210x_device = { 287 .driver = { 288 .owner = THIS_MODULE, 289 .name = "cp210x", 290 }, 291 .id_table = id_table, 292 .num_ports = 1, 293 .bulk_in_size = 256, 294 .bulk_out_size = 256, 295 .open = cp210x_open, 296 .close = cp210x_close, 297 .break_ctl = cp210x_break_ctl, 298 .set_termios = cp210x_set_termios, 299 .tx_empty = cp210x_tx_empty, 300 .throttle = usb_serial_generic_throttle, 301 .unthrottle = usb_serial_generic_unthrottle, 302 .tiocmget = cp210x_tiocmget, 303 .tiocmset = cp210x_tiocmset, 304 .get_icount = usb_serial_generic_get_icount, 305 .attach = cp210x_attach, 306 .disconnect = cp210x_disconnect, 307 .release = cp210x_release, 308 .port_probe = cp210x_port_probe, 309 .port_remove = cp210x_port_remove, 310 .dtr_rts = cp210x_dtr_rts, 311 .process_read_urb = cp210x_process_read_urb, 312 }; 313 314 static struct usb_serial_driver * const serial_drivers[] = { 315 &cp210x_device, NULL 316 }; 317 318 /* Config request types */ 319 #define REQTYPE_HOST_TO_INTERFACE 0x41 320 #define REQTYPE_INTERFACE_TO_HOST 0xc1 321 #define REQTYPE_HOST_TO_DEVICE 0x40 322 #define REQTYPE_DEVICE_TO_HOST 0xc0 323 324 /* Config request codes */ 325 #define CP210X_IFC_ENABLE 0x00 326 #define CP210X_SET_BAUDDIV 0x01 327 #define CP210X_GET_BAUDDIV 0x02 328 #define CP210X_SET_LINE_CTL 0x03 329 #define CP210X_GET_LINE_CTL 0x04 330 #define CP210X_SET_BREAK 0x05 331 #define CP210X_IMM_CHAR 0x06 332 #define CP210X_SET_MHS 0x07 333 #define CP210X_GET_MDMSTS 0x08 334 #define CP210X_SET_XON 0x09 335 #define CP210X_SET_XOFF 0x0A 336 #define CP210X_SET_EVENTMASK 0x0B 337 #define CP210X_GET_EVENTMASK 0x0C 338 #define CP210X_SET_CHAR 0x0D 339 #define CP210X_GET_CHARS 0x0E 340 #define CP210X_GET_PROPS 0x0F 341 #define CP210X_GET_COMM_STATUS 0x10 342 #define CP210X_RESET 0x11 343 #define CP210X_PURGE 0x12 344 #define CP210X_SET_FLOW 0x13 345 #define CP210X_GET_FLOW 0x14 346 #define CP210X_EMBED_EVENTS 0x15 347 #define CP210X_GET_EVENTSTATE 0x16 348 #define CP210X_SET_CHARS 0x19 349 #define CP210X_GET_BAUDRATE 0x1D 350 #define CP210X_SET_BAUDRATE 0x1E 351 #define CP210X_VENDOR_SPECIFIC 0xFF 352 353 /* CP210X_IFC_ENABLE */ 354 #define UART_ENABLE 0x0001 355 #define UART_DISABLE 0x0000 356 357 /* CP210X_(SET|GET)_BAUDDIV */ 358 #define BAUD_RATE_GEN_FREQ 0x384000 359 360 /* CP210X_(SET|GET)_LINE_CTL */ 361 #define BITS_DATA_MASK 0X0f00 362 #define BITS_DATA_5 0X0500 363 #define BITS_DATA_6 0X0600 364 #define BITS_DATA_7 0X0700 365 #define BITS_DATA_8 0X0800 366 #define BITS_DATA_9 0X0900 367 368 #define BITS_PARITY_MASK 0x00f0 369 #define BITS_PARITY_NONE 0x0000 370 #define BITS_PARITY_ODD 0x0010 371 #define BITS_PARITY_EVEN 0x0020 372 #define BITS_PARITY_MARK 0x0030 373 #define BITS_PARITY_SPACE 0x0040 374 375 #define BITS_STOP_MASK 0x000f 376 #define BITS_STOP_1 0x0000 377 #define BITS_STOP_1_5 0x0001 378 #define BITS_STOP_2 0x0002 379 380 /* CP210X_SET_BREAK */ 381 #define BREAK_ON 0x0001 382 #define BREAK_OFF 0x0000 383 384 /* CP210X_(SET_MHS|GET_MDMSTS) */ 385 #define CONTROL_DTR 0x0001 386 #define CONTROL_RTS 0x0002 387 #define CONTROL_CTS 0x0010 388 #define CONTROL_DSR 0x0020 389 #define CONTROL_RING 0x0040 390 #define CONTROL_DCD 0x0080 391 #define CONTROL_WRITE_DTR 0x0100 392 #define CONTROL_WRITE_RTS 0x0200 393 394 /* CP210X_(GET|SET)_CHARS */ 395 struct cp210x_special_chars { 396 u8 bEofChar; 397 u8 bErrorChar; 398 u8 bBreakChar; 399 u8 bEventChar; 400 u8 bXonChar; 401 u8 bXoffChar; 402 }; 403 404 /* CP210X_VENDOR_SPECIFIC values */ 405 #define CP210X_GET_FW_VER 0x000E 406 #define CP210X_READ_2NCONFIG 0x000E 407 #define CP210X_GET_FW_VER_2N 0x0010 408 #define CP210X_READ_LATCH 0x00C2 409 #define CP210X_GET_PARTNUM 0x370B 410 #define CP210X_GET_PORTCONFIG 0x370C 411 #define CP210X_GET_DEVICEMODE 0x3711 412 #define CP210X_WRITE_LATCH 0x37E1 413 414 /* Part number definitions */ 415 #define CP210X_PARTNUM_CP2101 0x01 416 #define CP210X_PARTNUM_CP2102 0x02 417 #define CP210X_PARTNUM_CP2103 0x03 418 #define CP210X_PARTNUM_CP2104 0x04 419 #define CP210X_PARTNUM_CP2105 0x05 420 #define CP210X_PARTNUM_CP2108 0x08 421 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 422 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 423 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 424 #define CP210X_PARTNUM_UNKNOWN 0xFF 425 426 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 427 struct cp210x_comm_status { 428 __le32 ulErrors; 429 __le32 ulHoldReasons; 430 __le32 ulAmountInInQueue; 431 __le32 ulAmountInOutQueue; 432 u8 bEofReceived; 433 u8 bWaitForImmediate; 434 u8 bReserved; 435 } __packed; 436 437 /* 438 * CP210X_PURGE - 16 bits passed in wValue of USB request. 439 * SiLabs app note AN571 gives a strange description of the 4 bits: 440 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 441 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 442 */ 443 #define PURGE_ALL 0x000f 444 445 /* CP210X_EMBED_EVENTS */ 446 #define CP210X_ESCCHAR 0xec 447 448 #define CP210X_LSR_OVERRUN BIT(1) 449 #define CP210X_LSR_PARITY BIT(2) 450 #define CP210X_LSR_FRAME BIT(3) 451 #define CP210X_LSR_BREAK BIT(4) 452 453 454 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 455 struct cp210x_flow_ctl { 456 __le32 ulControlHandshake; 457 __le32 ulFlowReplace; 458 __le32 ulXonLimit; 459 __le32 ulXoffLimit; 460 }; 461 462 /* cp210x_flow_ctl::ulControlHandshake */ 463 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 464 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 465 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 466 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 467 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 468 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 469 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 470 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 471 472 /* cp210x_flow_ctl::ulFlowReplace */ 473 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 474 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 475 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 476 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 477 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 478 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 479 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 480 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 481 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 482 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 483 484 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 485 struct cp210x_pin_mode { 486 u8 eci; 487 u8 sci; 488 }; 489 490 #define CP210X_PIN_MODE_MODEM 0 491 #define CP210X_PIN_MODE_GPIO BIT(0) 492 493 /* 494 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 495 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 496 */ 497 struct cp210x_dual_port_config { 498 __le16 gpio_mode; 499 u8 __pad0[2]; 500 __le16 reset_state; 501 u8 __pad1[4]; 502 __le16 suspend_state; 503 u8 sci_cfg; 504 u8 eci_cfg; 505 u8 device_cfg; 506 } __packed; 507 508 /* 509 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 510 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 511 */ 512 struct cp210x_single_port_config { 513 __le16 gpio_mode; 514 u8 __pad0[2]; 515 __le16 reset_state; 516 u8 __pad1[4]; 517 __le16 suspend_state; 518 u8 device_cfg; 519 } __packed; 520 521 /* GPIO modes */ 522 #define CP210X_SCI_GPIO_MODE_OFFSET 9 523 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 524 525 #define CP210X_ECI_GPIO_MODE_OFFSET 2 526 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 527 528 #define CP210X_GPIO_MODE_OFFSET 8 529 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 530 531 /* CP2105 port configuration values */ 532 #define CP2105_GPIO0_TXLED_MODE BIT(0) 533 #define CP2105_GPIO1_RXLED_MODE BIT(1) 534 #define CP2105_GPIO1_RS485_MODE BIT(2) 535 536 /* CP2104 port configuration values */ 537 #define CP2104_GPIO0_TXLED_MODE BIT(0) 538 #define CP2104_GPIO1_RXLED_MODE BIT(1) 539 #define CP2104_GPIO2_RS485_MODE BIT(2) 540 541 struct cp210x_quad_port_state { 542 __le16 gpio_mode_pb0; 543 __le16 gpio_mode_pb1; 544 __le16 gpio_mode_pb2; 545 __le16 gpio_mode_pb3; 546 __le16 gpio_mode_pb4; 547 548 __le16 gpio_lowpower_pb0; 549 __le16 gpio_lowpower_pb1; 550 __le16 gpio_lowpower_pb2; 551 __le16 gpio_lowpower_pb3; 552 __le16 gpio_lowpower_pb4; 553 554 __le16 gpio_latch_pb0; 555 __le16 gpio_latch_pb1; 556 __le16 gpio_latch_pb2; 557 __le16 gpio_latch_pb3; 558 __le16 gpio_latch_pb4; 559 }; 560 561 /* 562 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 563 * on a CP2108 chip. 564 * 565 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 566 */ 567 struct cp210x_quad_port_config { 568 struct cp210x_quad_port_state reset_state; 569 struct cp210x_quad_port_state suspend_state; 570 u8 ipdelay_ifc[4]; 571 u8 enhancedfxn_ifc[4]; 572 u8 enhancedfxn_device; 573 u8 extclkfreq[4]; 574 } __packed; 575 576 #define CP2108_EF_IFC_GPIO_TXLED 0x01 577 #define CP2108_EF_IFC_GPIO_RXLED 0x02 578 #define CP2108_EF_IFC_GPIO_RS485 0x04 579 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 580 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 581 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 582 583 /* CP2102N configuration array indices */ 584 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 585 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 586 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 587 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 588 589 /* CP2102N QFN20 port configuration values */ 590 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 591 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 592 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 593 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 594 595 /* 596 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 597 * for CP2102N, CP2103, CP2104 and CP2105. 598 */ 599 struct cp210x_gpio_write { 600 u8 mask; 601 u8 state; 602 }; 603 604 /* 605 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 606 * for CP2108. 607 */ 608 struct cp210x_gpio_write16 { 609 __le16 mask; 610 __le16 state; 611 }; 612 613 /* 614 * Helper to get interface number when we only have struct usb_serial. 615 */ 616 static u8 cp210x_interface_num(struct usb_serial *serial) 617 { 618 struct usb_host_interface *cur_altsetting; 619 620 cur_altsetting = serial->interface->cur_altsetting; 621 622 return cur_altsetting->desc.bInterfaceNumber; 623 } 624 625 /* 626 * Reads a variable-sized block of CP210X_ registers, identified by req. 627 * Returns data into buf in native USB byte order. 628 */ 629 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 630 void *buf, int bufsize) 631 { 632 struct usb_serial *serial = port->serial; 633 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 634 int result; 635 636 637 result = usb_control_msg_recv(serial->dev, 0, req, 638 REQTYPE_INTERFACE_TO_HOST, 0, 639 port_priv->bInterfaceNumber, buf, bufsize, 640 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 641 if (result) { 642 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 643 req, bufsize, result); 644 return result; 645 } 646 647 return 0; 648 } 649 650 /* 651 * Reads any 8-bit CP210X_ register identified by req. 652 */ 653 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 654 { 655 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 656 } 657 658 /* 659 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 660 * Returns data into buf in native USB byte order. 661 */ 662 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 663 void *buf, int bufsize) 664 { 665 int result; 666 667 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 668 type, val, cp210x_interface_num(serial), buf, bufsize, 669 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 670 if (result) { 671 dev_err(&serial->interface->dev, 672 "failed to get vendor val 0x%04x size %d: %d\n", val, 673 bufsize, result); 674 return result; 675 } 676 677 return 0; 678 } 679 680 /* 681 * Writes any 16-bit CP210X_ register (req) whose value is passed 682 * entirely in the wValue field of the USB request. 683 */ 684 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 685 { 686 struct usb_serial *serial = port->serial; 687 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 688 int result; 689 690 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 691 req, REQTYPE_HOST_TO_INTERFACE, val, 692 port_priv->bInterfaceNumber, NULL, 0, 693 USB_CTRL_SET_TIMEOUT); 694 if (result < 0) { 695 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 696 req, result); 697 } 698 699 return result; 700 } 701 702 /* 703 * Writes a variable-sized block of CP210X_ registers, identified by req. 704 * Data in buf must be in native USB byte order. 705 */ 706 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 707 void *buf, int bufsize) 708 { 709 struct usb_serial *serial = port->serial; 710 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 711 int result; 712 713 result = usb_control_msg_send(serial->dev, 0, req, 714 REQTYPE_HOST_TO_INTERFACE, 0, 715 port_priv->bInterfaceNumber, buf, bufsize, 716 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 717 if (result) { 718 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 719 req, bufsize, result); 720 return result; 721 } 722 723 return 0; 724 } 725 726 /* 727 * Writes any 32-bit CP210X_ register identified by req. 728 */ 729 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 730 { 731 __le32 le32_val; 732 733 le32_val = cpu_to_le32(val); 734 735 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 736 } 737 738 #ifdef CONFIG_GPIOLIB 739 /* 740 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 741 * Data in buf must be in native USB byte order. 742 */ 743 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 744 u16 val, void *buf, int bufsize) 745 { 746 int result; 747 748 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 749 type, val, cp210x_interface_num(serial), buf, bufsize, 750 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 751 if (result) { 752 dev_err(&serial->interface->dev, 753 "failed to set vendor val 0x%04x size %d: %d\n", val, 754 bufsize, result); 755 return result; 756 } 757 758 return 0; 759 } 760 #endif 761 762 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 763 { 764 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 765 int result; 766 767 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 768 if (result) { 769 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 770 return result; 771 } 772 773 if (tty) 774 cp210x_set_termios(tty, port, NULL); 775 776 result = usb_serial_generic_open(tty, port); 777 if (result) 778 goto err_disable; 779 780 return 0; 781 782 err_disable: 783 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 784 port_priv->event_mode = false; 785 786 return result; 787 } 788 789 static void cp210x_close(struct usb_serial_port *port) 790 { 791 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 792 793 usb_serial_generic_close(port); 794 795 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 796 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 797 798 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 799 800 /* Disabling the interface disables event-insertion mode. */ 801 port_priv->event_mode = false; 802 } 803 804 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 805 { 806 if (lsr & CP210X_LSR_BREAK) { 807 port->icount.brk++; 808 *flag = TTY_BREAK; 809 } else if (lsr & CP210X_LSR_PARITY) { 810 port->icount.parity++; 811 *flag = TTY_PARITY; 812 } else if (lsr & CP210X_LSR_FRAME) { 813 port->icount.frame++; 814 *flag = TTY_FRAME; 815 } 816 817 if (lsr & CP210X_LSR_OVERRUN) { 818 port->icount.overrun++; 819 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 820 } 821 } 822 823 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 824 { 825 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 826 827 switch (port_priv->event_state) { 828 case ES_DATA: 829 if (*ch == CP210X_ESCCHAR) { 830 port_priv->event_state = ES_ESCAPE; 831 break; 832 } 833 return false; 834 case ES_ESCAPE: 835 switch (*ch) { 836 case 0: 837 dev_dbg(&port->dev, "%s - escape char\n", __func__); 838 *ch = CP210X_ESCCHAR; 839 port_priv->event_state = ES_DATA; 840 return false; 841 case 1: 842 port_priv->event_state = ES_LSR_DATA_0; 843 break; 844 case 2: 845 port_priv->event_state = ES_LSR; 846 break; 847 case 3: 848 port_priv->event_state = ES_MSR; 849 break; 850 default: 851 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 852 port_priv->event_state = ES_DATA; 853 break; 854 } 855 break; 856 case ES_LSR_DATA_0: 857 port_priv->lsr = *ch; 858 port_priv->event_state = ES_LSR_DATA_1; 859 break; 860 case ES_LSR_DATA_1: 861 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 862 __func__, port_priv->lsr, *ch); 863 cp210x_process_lsr(port, port_priv->lsr, flag); 864 port_priv->event_state = ES_DATA; 865 return false; 866 case ES_LSR: 867 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 868 port_priv->lsr = *ch; 869 cp210x_process_lsr(port, port_priv->lsr, flag); 870 port_priv->event_state = ES_DATA; 871 break; 872 case ES_MSR: 873 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 874 /* unimplemented */ 875 port_priv->event_state = ES_DATA; 876 break; 877 } 878 879 return true; 880 } 881 882 static void cp210x_process_read_urb(struct urb *urb) 883 { 884 struct usb_serial_port *port = urb->context; 885 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 886 unsigned char *ch = urb->transfer_buffer; 887 char flag; 888 int i; 889 890 if (!urb->actual_length) 891 return; 892 893 if (port_priv->event_mode) { 894 for (i = 0; i < urb->actual_length; i++, ch++) { 895 flag = TTY_NORMAL; 896 897 if (cp210x_process_char(port, ch, &flag)) 898 continue; 899 900 tty_insert_flip_char(&port->port, *ch, flag); 901 } 902 } else { 903 tty_insert_flip_string(&port->port, ch, urb->actual_length); 904 } 905 tty_flip_buffer_push(&port->port); 906 } 907 908 /* 909 * Read how many bytes are waiting in the TX queue. 910 */ 911 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 912 u32 *count) 913 { 914 struct usb_serial *serial = port->serial; 915 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 916 struct cp210x_comm_status sts; 917 int result; 918 919 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 920 REQTYPE_INTERFACE_TO_HOST, 0, 921 port_priv->bInterfaceNumber, &sts, sizeof(sts), 922 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 923 if (result) { 924 dev_err(&port->dev, "failed to get comm status: %d\n", result); 925 return result; 926 } 927 928 *count = le32_to_cpu(sts.ulAmountInOutQueue); 929 930 return 0; 931 } 932 933 static bool cp210x_tx_empty(struct usb_serial_port *port) 934 { 935 int err; 936 u32 count; 937 938 err = cp210x_get_tx_queue_byte_count(port, &count); 939 if (err) 940 return true; 941 942 return !count; 943 } 944 945 struct cp210x_rate { 946 speed_t rate; 947 speed_t high; 948 }; 949 950 static const struct cp210x_rate cp210x_an205_table1[] = { 951 { 300, 300 }, 952 { 600, 600 }, 953 { 1200, 1200 }, 954 { 1800, 1800 }, 955 { 2400, 2400 }, 956 { 4000, 4000 }, 957 { 4800, 4803 }, 958 { 7200, 7207 }, 959 { 9600, 9612 }, 960 { 14400, 14428 }, 961 { 16000, 16062 }, 962 { 19200, 19250 }, 963 { 28800, 28912 }, 964 { 38400, 38601 }, 965 { 51200, 51558 }, 966 { 56000, 56280 }, 967 { 57600, 58053 }, 968 { 64000, 64111 }, 969 { 76800, 77608 }, 970 { 115200, 117028 }, 971 { 128000, 129347 }, 972 { 153600, 156868 }, 973 { 230400, 237832 }, 974 { 250000, 254234 }, 975 { 256000, 273066 }, 976 { 460800, 491520 }, 977 { 500000, 567138 }, 978 { 576000, 670254 }, 979 { 921600, UINT_MAX } 980 }; 981 982 /* 983 * Quantises the baud rate as per AN205 Table 1 984 */ 985 static speed_t cp210x_get_an205_rate(speed_t baud) 986 { 987 int i; 988 989 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 990 if (baud <= cp210x_an205_table1[i].high) 991 break; 992 } 993 994 return cp210x_an205_table1[i].rate; 995 } 996 997 static speed_t cp210x_get_actual_rate(speed_t baud) 998 { 999 unsigned int prescale = 1; 1000 unsigned int div; 1001 1002 if (baud <= 365) 1003 prescale = 4; 1004 1005 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1006 baud = 48000000 / (2 * prescale * div); 1007 1008 return baud; 1009 } 1010 1011 /* 1012 * CP2101 supports the following baud rates: 1013 * 1014 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1015 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1016 * 1017 * CP2102 and CP2103 support the following additional rates: 1018 * 1019 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1020 * 576000 1021 * 1022 * The device will map a requested rate to a supported one, but the result 1023 * of requests for rates greater than 1053257 is undefined (see AN205). 1024 * 1025 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1026 * respectively, with an error less than 1%. The actual rates are determined 1027 * by 1028 * 1029 * div = round(freq / (2 x prescale x request)) 1030 * actual = freq / (2 x prescale x div) 1031 * 1032 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1033 * or 1 otherwise. 1034 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1035 * otherwise. 1036 */ 1037 static void cp210x_change_speed(struct tty_struct *tty, 1038 struct usb_serial_port *port, struct ktermios *old_termios) 1039 { 1040 struct usb_serial *serial = port->serial; 1041 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1042 u32 baud; 1043 1044 /* 1045 * This maps the requested rate to the actual rate, a valid rate on 1046 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1047 * 1048 * NOTE: B0 is not implemented. 1049 */ 1050 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1051 1052 if (priv->use_actual_rate) 1053 baud = cp210x_get_actual_rate(baud); 1054 else if (baud < 1000000) 1055 baud = cp210x_get_an205_rate(baud); 1056 1057 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1058 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1059 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1060 if (old_termios) 1061 baud = old_termios->c_ospeed; 1062 else 1063 baud = 9600; 1064 } 1065 1066 tty_encode_baud_rate(tty, baud, baud); 1067 } 1068 1069 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1070 { 1071 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1072 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1073 int ret; 1074 1075 if (port_priv->event_mode) 1076 return; 1077 1078 if (priv->no_event_mode) 1079 return; 1080 1081 port_priv->event_state = ES_DATA; 1082 port_priv->event_mode = true; 1083 1084 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1085 if (ret) { 1086 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1087 port_priv->event_mode = false; 1088 } 1089 } 1090 1091 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1092 { 1093 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1094 int ret; 1095 1096 if (!port_priv->event_mode) 1097 return; 1098 1099 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1100 if (ret) { 1101 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1102 return; 1103 } 1104 1105 port_priv->event_mode = false; 1106 } 1107 1108 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1109 { 1110 bool iflag_change, cc_change; 1111 1112 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1113 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1114 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1115 1116 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1117 } 1118 1119 static void cp210x_set_flow_control(struct tty_struct *tty, 1120 struct usb_serial_port *port, struct ktermios *old_termios) 1121 { 1122 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1123 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1124 struct cp210x_special_chars chars; 1125 struct cp210x_flow_ctl flow_ctl; 1126 u32 flow_repl; 1127 u32 ctl_hs; 1128 bool crtscts; 1129 int ret; 1130 1131 /* 1132 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1133 * CP2102N_E104). Report back that flow control is not supported. 1134 */ 1135 if (priv->no_flow_control) { 1136 tty->termios.c_cflag &= ~CRTSCTS; 1137 tty->termios.c_iflag &= ~(IXON | IXOFF); 1138 } 1139 1140 if (old_termios && 1141 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1142 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1143 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1144 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1145 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1146 return; 1147 } 1148 1149 if (I_IXON(tty) || I_IXOFF(tty)) { 1150 memset(&chars, 0, sizeof(chars)); 1151 1152 chars.bXonChar = START_CHAR(tty); 1153 chars.bXoffChar = STOP_CHAR(tty); 1154 1155 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1156 sizeof(chars)); 1157 if (ret) { 1158 dev_err(&port->dev, "failed to set special chars: %d\n", 1159 ret); 1160 } 1161 } 1162 1163 mutex_lock(&port_priv->mutex); 1164 1165 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1166 sizeof(flow_ctl)); 1167 if (ret) 1168 goto out_unlock; 1169 1170 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1171 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1172 1173 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1174 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1175 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1176 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1177 if (port_priv->dtr) 1178 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1179 else 1180 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1181 1182 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1183 if (C_CRTSCTS(tty)) { 1184 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1185 if (port_priv->rts) 1186 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1187 else 1188 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1189 crtscts = true; 1190 } else { 1191 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1192 if (port_priv->rts) 1193 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1194 else 1195 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1196 crtscts = false; 1197 } 1198 1199 if (I_IXOFF(tty)) { 1200 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1201 1202 flow_ctl.ulXonLimit = cpu_to_le32(128); 1203 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1204 } else { 1205 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1206 } 1207 1208 if (I_IXON(tty)) 1209 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1210 else 1211 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1212 1213 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1214 ctl_hs, flow_repl); 1215 1216 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1217 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1218 1219 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1220 sizeof(flow_ctl)); 1221 if (ret) 1222 goto out_unlock; 1223 1224 port_priv->crtscts = crtscts; 1225 out_unlock: 1226 mutex_unlock(&port_priv->mutex); 1227 } 1228 1229 static void cp210x_set_termios(struct tty_struct *tty, 1230 struct usb_serial_port *port, struct ktermios *old_termios) 1231 { 1232 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1233 u16 bits; 1234 int ret; 1235 1236 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1237 return; 1238 1239 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1240 cp210x_change_speed(tty, port, old_termios); 1241 1242 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1243 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1244 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1245 tty->termios.c_cflag |= CS8; 1246 } 1247 1248 bits = 0; 1249 1250 switch (C_CSIZE(tty)) { 1251 case CS5: 1252 bits |= BITS_DATA_5; 1253 break; 1254 case CS6: 1255 bits |= BITS_DATA_6; 1256 break; 1257 case CS7: 1258 bits |= BITS_DATA_7; 1259 break; 1260 case CS8: 1261 default: 1262 bits |= BITS_DATA_8; 1263 break; 1264 } 1265 1266 if (C_PARENB(tty)) { 1267 if (C_CMSPAR(tty)) { 1268 if (C_PARODD(tty)) 1269 bits |= BITS_PARITY_MARK; 1270 else 1271 bits |= BITS_PARITY_SPACE; 1272 } else { 1273 if (C_PARODD(tty)) 1274 bits |= BITS_PARITY_ODD; 1275 else 1276 bits |= BITS_PARITY_EVEN; 1277 } 1278 } 1279 1280 if (C_CSTOPB(tty)) 1281 bits |= BITS_STOP_2; 1282 else 1283 bits |= BITS_STOP_1; 1284 1285 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1286 if (ret) 1287 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1288 1289 cp210x_set_flow_control(tty, port, old_termios); 1290 1291 /* 1292 * Enable event-insertion mode only if input parity checking is 1293 * enabled for now. 1294 */ 1295 if (I_INPCK(tty)) 1296 cp210x_enable_event_mode(port); 1297 else 1298 cp210x_disable_event_mode(port); 1299 } 1300 1301 static int cp210x_tiocmset(struct tty_struct *tty, 1302 unsigned int set, unsigned int clear) 1303 { 1304 struct usb_serial_port *port = tty->driver_data; 1305 return cp210x_tiocmset_port(port, set, clear); 1306 } 1307 1308 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1309 unsigned int set, unsigned int clear) 1310 { 1311 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1312 struct cp210x_flow_ctl flow_ctl; 1313 u32 ctl_hs, flow_repl; 1314 u16 control = 0; 1315 int ret; 1316 1317 mutex_lock(&port_priv->mutex); 1318 1319 if (set & TIOCM_RTS) { 1320 port_priv->rts = true; 1321 control |= CONTROL_RTS; 1322 control |= CONTROL_WRITE_RTS; 1323 } 1324 if (set & TIOCM_DTR) { 1325 port_priv->dtr = true; 1326 control |= CONTROL_DTR; 1327 control |= CONTROL_WRITE_DTR; 1328 } 1329 if (clear & TIOCM_RTS) { 1330 port_priv->rts = false; 1331 control &= ~CONTROL_RTS; 1332 control |= CONTROL_WRITE_RTS; 1333 } 1334 if (clear & TIOCM_DTR) { 1335 port_priv->dtr = false; 1336 control &= ~CONTROL_DTR; 1337 control |= CONTROL_WRITE_DTR; 1338 } 1339 1340 /* 1341 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1342 * flow control is enabled. 1343 */ 1344 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1345 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1346 sizeof(flow_ctl)); 1347 if (ret) 1348 goto out_unlock; 1349 1350 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1351 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1352 1353 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1354 if (port_priv->dtr) 1355 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1356 else 1357 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1358 1359 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1360 if (port_priv->rts) 1361 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1362 else 1363 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1364 1365 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1366 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1367 1368 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1369 __func__, ctl_hs, flow_repl); 1370 1371 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1372 sizeof(flow_ctl)); 1373 } else { 1374 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1375 1376 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1377 } 1378 out_unlock: 1379 mutex_unlock(&port_priv->mutex); 1380 1381 return ret; 1382 } 1383 1384 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1385 { 1386 if (on) 1387 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1388 else 1389 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1390 } 1391 1392 static int cp210x_tiocmget(struct tty_struct *tty) 1393 { 1394 struct usb_serial_port *port = tty->driver_data; 1395 u8 control; 1396 int result; 1397 1398 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1399 if (result) 1400 return result; 1401 1402 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1403 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1404 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1405 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1406 |((control & CONTROL_RING)? TIOCM_RI : 0) 1407 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1408 1409 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1410 1411 return result; 1412 } 1413 1414 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1415 { 1416 struct usb_serial_port *port = tty->driver_data; 1417 u16 state; 1418 1419 if (break_state == 0) 1420 state = BREAK_OFF; 1421 else 1422 state = BREAK_ON; 1423 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1424 state == BREAK_OFF ? "off" : "on"); 1425 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1426 } 1427 1428 #ifdef CONFIG_GPIOLIB 1429 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1430 { 1431 struct usb_serial *serial = gpiochip_get_data(gc); 1432 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1433 u8 req_type; 1434 u16 mask; 1435 int result; 1436 int len; 1437 1438 result = usb_autopm_get_interface(serial->interface); 1439 if (result) 1440 return result; 1441 1442 switch (priv->partnum) { 1443 case CP210X_PARTNUM_CP2105: 1444 req_type = REQTYPE_INTERFACE_TO_HOST; 1445 len = 1; 1446 break; 1447 case CP210X_PARTNUM_CP2108: 1448 req_type = REQTYPE_INTERFACE_TO_HOST; 1449 len = 2; 1450 break; 1451 default: 1452 req_type = REQTYPE_DEVICE_TO_HOST; 1453 len = 1; 1454 break; 1455 } 1456 1457 mask = 0; 1458 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1459 &mask, len); 1460 1461 usb_autopm_put_interface(serial->interface); 1462 1463 if (result < 0) 1464 return result; 1465 1466 le16_to_cpus(&mask); 1467 1468 return !!(mask & BIT(gpio)); 1469 } 1470 1471 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1472 { 1473 struct usb_serial *serial = gpiochip_get_data(gc); 1474 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1475 struct cp210x_gpio_write16 buf16; 1476 struct cp210x_gpio_write buf; 1477 u16 mask, state; 1478 u16 wIndex; 1479 int result; 1480 1481 if (value == 1) 1482 state = BIT(gpio); 1483 else 1484 state = 0; 1485 1486 mask = BIT(gpio); 1487 1488 result = usb_autopm_get_interface(serial->interface); 1489 if (result) 1490 goto out; 1491 1492 switch (priv->partnum) { 1493 case CP210X_PARTNUM_CP2105: 1494 buf.mask = (u8)mask; 1495 buf.state = (u8)state; 1496 result = cp210x_write_vendor_block(serial, 1497 REQTYPE_HOST_TO_INTERFACE, 1498 CP210X_WRITE_LATCH, &buf, 1499 sizeof(buf)); 1500 break; 1501 case CP210X_PARTNUM_CP2108: 1502 buf16.mask = cpu_to_le16(mask); 1503 buf16.state = cpu_to_le16(state); 1504 result = cp210x_write_vendor_block(serial, 1505 REQTYPE_HOST_TO_INTERFACE, 1506 CP210X_WRITE_LATCH, &buf16, 1507 sizeof(buf16)); 1508 break; 1509 default: 1510 wIndex = state << 8 | mask; 1511 result = usb_control_msg(serial->dev, 1512 usb_sndctrlpipe(serial->dev, 0), 1513 CP210X_VENDOR_SPECIFIC, 1514 REQTYPE_HOST_TO_DEVICE, 1515 CP210X_WRITE_LATCH, 1516 wIndex, 1517 NULL, 0, USB_CTRL_SET_TIMEOUT); 1518 break; 1519 } 1520 1521 usb_autopm_put_interface(serial->interface); 1522 out: 1523 if (result < 0) { 1524 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1525 result); 1526 } 1527 } 1528 1529 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1530 { 1531 struct usb_serial *serial = gpiochip_get_data(gc); 1532 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1533 1534 return priv->gpio_input & BIT(gpio); 1535 } 1536 1537 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1538 { 1539 struct usb_serial *serial = gpiochip_get_data(gc); 1540 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1541 1542 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1543 /* hardware does not support an input mode */ 1544 return -ENOTSUPP; 1545 } 1546 1547 /* push-pull pins cannot be changed to be inputs */ 1548 if (priv->gpio_pushpull & BIT(gpio)) 1549 return -EINVAL; 1550 1551 /* make sure to release pin if it is being driven low */ 1552 cp210x_gpio_set(gc, gpio, 1); 1553 1554 priv->gpio_input |= BIT(gpio); 1555 1556 return 0; 1557 } 1558 1559 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1560 int value) 1561 { 1562 struct usb_serial *serial = gpiochip_get_data(gc); 1563 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1564 1565 priv->gpio_input &= ~BIT(gpio); 1566 cp210x_gpio_set(gc, gpio, value); 1567 1568 return 0; 1569 } 1570 1571 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1572 unsigned long config) 1573 { 1574 struct usb_serial *serial = gpiochip_get_data(gc); 1575 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1576 enum pin_config_param param = pinconf_to_config_param(config); 1577 1578 /* Succeed only if in correct mode (this can't be set at runtime) */ 1579 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1580 (priv->gpio_pushpull & BIT(gpio))) 1581 return 0; 1582 1583 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1584 !(priv->gpio_pushpull & BIT(gpio))) 1585 return 0; 1586 1587 return -ENOTSUPP; 1588 } 1589 1590 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1591 unsigned long *valid_mask, unsigned int ngpios) 1592 { 1593 struct usb_serial *serial = gpiochip_get_data(gc); 1594 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1595 struct device *dev = &serial->interface->dev; 1596 unsigned long altfunc_mask = priv->gpio_altfunc; 1597 1598 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1599 1600 if (bitmap_empty(valid_mask, ngpios)) 1601 dev_dbg(dev, "no pin configured for GPIO\n"); 1602 else 1603 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1604 valid_mask); 1605 return 0; 1606 } 1607 1608 /* 1609 * This function is for configuring GPIO using shared pins, where other signals 1610 * are made unavailable by configuring the use of GPIO. This is believed to be 1611 * only applicable to the cp2105 at this point, the other devices supported by 1612 * this driver that provide GPIO do so in a way that does not impact other 1613 * signals and are thus expected to have very different initialisation. 1614 */ 1615 static int cp2105_gpioconf_init(struct usb_serial *serial) 1616 { 1617 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1618 struct cp210x_pin_mode mode; 1619 struct cp210x_dual_port_config config; 1620 u8 intf_num = cp210x_interface_num(serial); 1621 u8 iface_config; 1622 int result; 1623 1624 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1625 CP210X_GET_DEVICEMODE, &mode, 1626 sizeof(mode)); 1627 if (result < 0) 1628 return result; 1629 1630 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1631 CP210X_GET_PORTCONFIG, &config, 1632 sizeof(config)); 1633 if (result < 0) 1634 return result; 1635 1636 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1637 if (intf_num == 0) { 1638 priv->gc.ngpio = 2; 1639 1640 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1641 /* mark all GPIOs of this interface as reserved */ 1642 priv->gpio_altfunc = 0xff; 1643 return 0; 1644 } 1645 1646 iface_config = config.eci_cfg; 1647 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1648 CP210X_ECI_GPIO_MODE_MASK) >> 1649 CP210X_ECI_GPIO_MODE_OFFSET); 1650 } else if (intf_num == 1) { 1651 priv->gc.ngpio = 3; 1652 1653 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1654 /* mark all GPIOs of this interface as reserved */ 1655 priv->gpio_altfunc = 0xff; 1656 return 0; 1657 } 1658 1659 iface_config = config.sci_cfg; 1660 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1661 CP210X_SCI_GPIO_MODE_MASK) >> 1662 CP210X_SCI_GPIO_MODE_OFFSET); 1663 } else { 1664 return -ENODEV; 1665 } 1666 1667 /* mark all pins which are not in GPIO mode */ 1668 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1669 priv->gpio_altfunc |= BIT(0); 1670 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1671 CP2105_GPIO1_RS485_MODE)) 1672 priv->gpio_altfunc |= BIT(1); 1673 1674 /* driver implementation for CP2105 only supports outputs */ 1675 priv->gpio_input = 0; 1676 1677 return 0; 1678 } 1679 1680 static int cp2104_gpioconf_init(struct usb_serial *serial) 1681 { 1682 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1683 struct cp210x_single_port_config config; 1684 u8 iface_config; 1685 u8 gpio_latch; 1686 int result; 1687 u8 i; 1688 1689 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1690 CP210X_GET_PORTCONFIG, &config, 1691 sizeof(config)); 1692 if (result < 0) 1693 return result; 1694 1695 priv->gc.ngpio = 4; 1696 1697 iface_config = config.device_cfg; 1698 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1699 CP210X_GPIO_MODE_MASK) >> 1700 CP210X_GPIO_MODE_OFFSET); 1701 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1702 CP210X_GPIO_MODE_MASK) >> 1703 CP210X_GPIO_MODE_OFFSET); 1704 1705 /* mark all pins which are not in GPIO mode */ 1706 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1707 priv->gpio_altfunc |= BIT(0); 1708 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1709 priv->gpio_altfunc |= BIT(1); 1710 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1711 priv->gpio_altfunc |= BIT(2); 1712 1713 /* 1714 * Like CP2102N, CP2104 has also no strict input and output pin 1715 * modes. 1716 * Do the same input mode emulation as CP2102N. 1717 */ 1718 for (i = 0; i < priv->gc.ngpio; ++i) { 1719 /* 1720 * Set direction to "input" iff pin is open-drain and reset 1721 * value is 1. 1722 */ 1723 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1724 priv->gpio_input |= BIT(i); 1725 } 1726 1727 return 0; 1728 } 1729 1730 static int cp2108_gpio_init(struct usb_serial *serial) 1731 { 1732 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1733 struct cp210x_quad_port_config config; 1734 u16 gpio_latch; 1735 int result; 1736 u8 i; 1737 1738 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1739 CP210X_GET_PORTCONFIG, &config, 1740 sizeof(config)); 1741 if (result < 0) 1742 return result; 1743 1744 priv->gc.ngpio = 16; 1745 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1746 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1747 1748 /* 1749 * Mark all pins which are not in GPIO mode. 1750 * 1751 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1752 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1753 * 1754 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1755 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1756 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1757 */ 1758 for (i = 0; i < 4; i++) { 1759 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1760 priv->gpio_altfunc |= BIT(i * 4); 1761 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1762 priv->gpio_altfunc |= BIT((i * 4) + 1); 1763 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1764 priv->gpio_altfunc |= BIT((i * 4) + 2); 1765 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1766 priv->gpio_altfunc |= BIT((i * 4) + 3); 1767 } 1768 1769 /* 1770 * Like CP2102N, CP2108 has also no strict input and output pin 1771 * modes. Do the same input mode emulation as CP2102N. 1772 */ 1773 for (i = 0; i < priv->gc.ngpio; ++i) { 1774 /* 1775 * Set direction to "input" iff pin is open-drain and reset 1776 * value is 1. 1777 */ 1778 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1779 priv->gpio_input |= BIT(i); 1780 } 1781 1782 return 0; 1783 } 1784 1785 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1786 { 1787 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1788 const u16 config_size = 0x02a6; 1789 u8 gpio_rst_latch; 1790 u8 config_version; 1791 u8 gpio_pushpull; 1792 u8 *config_buf; 1793 u8 gpio_latch; 1794 u8 gpio_ctrl; 1795 int result; 1796 u8 i; 1797 1798 /* 1799 * Retrieve device configuration from the device. 1800 * The array received contains all customization settings done at the 1801 * factory/manufacturer. Format of the array is documented at the 1802 * time of writing at: 1803 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1804 */ 1805 config_buf = kmalloc(config_size, GFP_KERNEL); 1806 if (!config_buf) 1807 return -ENOMEM; 1808 1809 result = cp210x_read_vendor_block(serial, 1810 REQTYPE_DEVICE_TO_HOST, 1811 CP210X_READ_2NCONFIG, 1812 config_buf, 1813 config_size); 1814 if (result < 0) { 1815 kfree(config_buf); 1816 return result; 1817 } 1818 1819 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1820 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1821 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1822 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1823 1824 kfree(config_buf); 1825 1826 /* Make sure this is a config format we understand. */ 1827 if (config_version != 0x01) 1828 return -ENOTSUPP; 1829 1830 priv->gc.ngpio = 4; 1831 1832 /* 1833 * Get default pin states after reset. Needed so we can determine 1834 * the direction of an open-drain pin. 1835 */ 1836 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1837 1838 /* 0 indicates open-drain mode, 1 is push-pull */ 1839 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1840 1841 /* 0 indicates GPIO mode, 1 is alternate function */ 1842 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1843 /* QFN20 is special... */ 1844 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1845 priv->gpio_altfunc |= BIT(0); 1846 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1847 priv->gpio_altfunc |= BIT(1); 1848 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1849 priv->gpio_altfunc |= BIT(2); 1850 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1851 priv->gpio_altfunc |= BIT(3); 1852 } else { 1853 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1854 } 1855 1856 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1857 /* 1858 * For the QFN28 package, GPIO4-6 are controlled by 1859 * the low three bits of the mode/latch fields. 1860 * Contrary to the document linked above, the bits for 1861 * the SUSPEND pins are elsewhere. No alternate 1862 * function is available for these pins. 1863 */ 1864 priv->gc.ngpio = 7; 1865 gpio_latch |= (gpio_rst_latch & 7) << 4; 1866 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1867 } 1868 1869 /* 1870 * The CP2102N does not strictly has input and output pin modes, 1871 * it only knows open-drain and push-pull modes which is set at 1872 * factory. An open-drain pin can function both as an 1873 * input or an output. We emulate input mode for open-drain pins 1874 * by making sure they are not driven low, and we do not allow 1875 * push-pull pins to be set as an input. 1876 */ 1877 for (i = 0; i < priv->gc.ngpio; ++i) { 1878 /* 1879 * Set direction to "input" iff pin is open-drain and reset 1880 * value is 1. 1881 */ 1882 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1883 priv->gpio_input |= BIT(i); 1884 } 1885 1886 return 0; 1887 } 1888 1889 static int cp210x_gpio_init(struct usb_serial *serial) 1890 { 1891 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1892 int result; 1893 1894 switch (priv->partnum) { 1895 case CP210X_PARTNUM_CP2104: 1896 result = cp2104_gpioconf_init(serial); 1897 break; 1898 case CP210X_PARTNUM_CP2105: 1899 result = cp2105_gpioconf_init(serial); 1900 break; 1901 case CP210X_PARTNUM_CP2108: 1902 /* 1903 * The GPIOs are not tied to any specific port so only register 1904 * once for interface 0. 1905 */ 1906 if (cp210x_interface_num(serial) != 0) 1907 return 0; 1908 result = cp2108_gpio_init(serial); 1909 break; 1910 case CP210X_PARTNUM_CP2102N_QFN28: 1911 case CP210X_PARTNUM_CP2102N_QFN24: 1912 case CP210X_PARTNUM_CP2102N_QFN20: 1913 result = cp2102n_gpioconf_init(serial); 1914 break; 1915 default: 1916 return 0; 1917 } 1918 1919 if (result < 0) 1920 return result; 1921 1922 priv->gc.label = "cp210x"; 1923 priv->gc.get_direction = cp210x_gpio_direction_get; 1924 priv->gc.direction_input = cp210x_gpio_direction_input; 1925 priv->gc.direction_output = cp210x_gpio_direction_output; 1926 priv->gc.get = cp210x_gpio_get; 1927 priv->gc.set = cp210x_gpio_set; 1928 priv->gc.set_config = cp210x_gpio_set_config; 1929 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1930 priv->gc.owner = THIS_MODULE; 1931 priv->gc.parent = &serial->interface->dev; 1932 priv->gc.base = -1; 1933 priv->gc.can_sleep = true; 1934 1935 result = gpiochip_add_data(&priv->gc, serial); 1936 if (!result) 1937 priv->gpio_registered = true; 1938 1939 return result; 1940 } 1941 1942 static void cp210x_gpio_remove(struct usb_serial *serial) 1943 { 1944 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1945 1946 if (priv->gpio_registered) { 1947 gpiochip_remove(&priv->gc); 1948 priv->gpio_registered = false; 1949 } 1950 } 1951 1952 #else 1953 1954 static int cp210x_gpio_init(struct usb_serial *serial) 1955 { 1956 return 0; 1957 } 1958 1959 static void cp210x_gpio_remove(struct usb_serial *serial) 1960 { 1961 /* Nothing to do */ 1962 } 1963 1964 #endif 1965 1966 static int cp210x_port_probe(struct usb_serial_port *port) 1967 { 1968 struct usb_serial *serial = port->serial; 1969 struct cp210x_port_private *port_priv; 1970 1971 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1972 if (!port_priv) 1973 return -ENOMEM; 1974 1975 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1976 mutex_init(&port_priv->mutex); 1977 1978 usb_set_serial_port_data(port, port_priv); 1979 1980 return 0; 1981 } 1982 1983 static void cp210x_port_remove(struct usb_serial_port *port) 1984 { 1985 struct cp210x_port_private *port_priv; 1986 1987 port_priv = usb_get_serial_port_data(port); 1988 kfree(port_priv); 1989 } 1990 1991 static void cp210x_init_max_speed(struct usb_serial *serial) 1992 { 1993 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1994 bool use_actual_rate = false; 1995 speed_t min = 300; 1996 speed_t max; 1997 1998 switch (priv->partnum) { 1999 case CP210X_PARTNUM_CP2101: 2000 max = 921600; 2001 break; 2002 case CP210X_PARTNUM_CP2102: 2003 case CP210X_PARTNUM_CP2103: 2004 max = 1000000; 2005 break; 2006 case CP210X_PARTNUM_CP2104: 2007 use_actual_rate = true; 2008 max = 2000000; 2009 break; 2010 case CP210X_PARTNUM_CP2108: 2011 max = 2000000; 2012 break; 2013 case CP210X_PARTNUM_CP2105: 2014 if (cp210x_interface_num(serial) == 0) { 2015 use_actual_rate = true; 2016 max = 2000000; /* ECI */ 2017 } else { 2018 min = 2400; 2019 max = 921600; /* SCI */ 2020 } 2021 break; 2022 case CP210X_PARTNUM_CP2102N_QFN28: 2023 case CP210X_PARTNUM_CP2102N_QFN24: 2024 case CP210X_PARTNUM_CP2102N_QFN20: 2025 use_actual_rate = true; 2026 max = 3000000; 2027 break; 2028 default: 2029 max = 2000000; 2030 break; 2031 } 2032 2033 priv->min_speed = min; 2034 priv->max_speed = max; 2035 priv->use_actual_rate = use_actual_rate; 2036 } 2037 2038 static void cp2102_determine_quirks(struct usb_serial *serial) 2039 { 2040 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2041 u8 *buf; 2042 int ret; 2043 2044 buf = kmalloc(2, GFP_KERNEL); 2045 if (!buf) 2046 return; 2047 /* 2048 * Some (possibly counterfeit) CP2102 do not support event-insertion 2049 * mode and respond differently to malformed vendor requests. 2050 * Specifically, they return one instead of two bytes when sent a 2051 * two-byte part-number request. 2052 */ 2053 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2054 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2055 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2056 if (ret == 1) { 2057 dev_dbg(&serial->interface->dev, 2058 "device does not support event-insertion mode\n"); 2059 priv->no_event_mode = true; 2060 } 2061 2062 kfree(buf); 2063 } 2064 2065 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2066 { 2067 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2068 u8 ver[3]; 2069 int ret; 2070 2071 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2072 ver, sizeof(ver)); 2073 if (ret) 2074 return ret; 2075 2076 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2077 ver[0], ver[1], ver[2]); 2078 2079 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2080 2081 return 0; 2082 } 2083 2084 static void cp210x_determine_type(struct usb_serial *serial) 2085 { 2086 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2087 int ret; 2088 2089 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2090 CP210X_GET_PARTNUM, &priv->partnum, 2091 sizeof(priv->partnum)); 2092 if (ret < 0) { 2093 dev_warn(&serial->interface->dev, 2094 "querying part number failed\n"); 2095 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2096 return; 2097 } 2098 2099 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2100 2101 switch (priv->partnum) { 2102 case CP210X_PARTNUM_CP2102: 2103 cp2102_determine_quirks(serial); 2104 break; 2105 case CP210X_PARTNUM_CP2105: 2106 case CP210X_PARTNUM_CP2108: 2107 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2108 break; 2109 case CP210X_PARTNUM_CP2102N_QFN28: 2110 case CP210X_PARTNUM_CP2102N_QFN24: 2111 case CP210X_PARTNUM_CP2102N_QFN20: 2112 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2113 if (ret) 2114 break; 2115 if (priv->fw_version <= 0x10004) 2116 priv->no_flow_control = true; 2117 break; 2118 default: 2119 break; 2120 } 2121 } 2122 2123 static int cp210x_attach(struct usb_serial *serial) 2124 { 2125 int result; 2126 struct cp210x_serial_private *priv; 2127 2128 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2129 if (!priv) 2130 return -ENOMEM; 2131 2132 usb_set_serial_data(serial, priv); 2133 2134 cp210x_determine_type(serial); 2135 cp210x_init_max_speed(serial); 2136 2137 result = cp210x_gpio_init(serial); 2138 if (result < 0) { 2139 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2140 result); 2141 } 2142 2143 return 0; 2144 } 2145 2146 static void cp210x_disconnect(struct usb_serial *serial) 2147 { 2148 cp210x_gpio_remove(serial); 2149 } 2150 2151 static void cp210x_release(struct usb_serial *serial) 2152 { 2153 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2154 2155 cp210x_gpio_remove(serial); 2156 2157 kfree(priv); 2158 } 2159 2160 module_usb_serial_driver(serial_drivers, id_table); 2161 2162 MODULE_DESCRIPTION(DRIVER_DESC); 2163 MODULE_LICENSE("GPL v2"); 2164