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(0x0404, 0x034C) }, /* NCR Retail IO Box */ 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(0x0988, 0x0578) }, /* Teraoka AD2000 */ 65 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 66 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 67 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 68 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 70 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 71 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 72 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 73 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 74 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 75 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 76 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 77 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 78 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 79 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 80 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 81 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 82 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 83 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 84 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 101 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 104 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 105 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 106 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 107 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 108 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 109 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 110 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 111 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 112 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 113 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 114 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 115 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 116 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 117 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 118 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 119 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 120 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 121 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 122 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 123 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 124 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 125 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 126 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 127 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 128 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 129 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 130 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 131 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 132 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 133 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 134 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 135 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 136 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 137 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 138 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 139 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 140 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 141 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 142 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 143 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 144 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 145 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 146 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 147 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 149 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 150 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 151 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 152 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 153 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 154 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 155 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 156 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 157 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 158 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 159 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 160 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 161 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 162 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 164 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 165 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 166 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 167 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 168 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 169 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 170 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 171 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 172 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 173 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 174 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 175 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 176 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 177 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 178 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 179 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 180 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 181 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 182 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 183 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 184 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 185 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 186 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 187 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 188 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 189 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 190 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 191 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 192 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 193 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 194 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 195 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 196 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 197 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 198 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 199 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 200 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 201 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 202 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 203 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 204 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 205 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 206 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 207 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 208 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 209 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 210 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 211 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 212 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 213 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 214 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 215 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 216 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 217 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 218 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 219 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 220 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 221 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 222 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 223 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 224 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 225 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 226 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 227 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 230 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 231 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 232 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 233 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 234 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 235 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 236 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 237 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 238 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 239 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 240 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 241 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 242 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 243 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 244 { } /* Terminating Entry */ 245 }; 246 247 MODULE_DEVICE_TABLE(usb, id_table); 248 249 struct cp210x_serial_private { 250 #ifdef CONFIG_GPIOLIB 251 struct gpio_chip gc; 252 bool gpio_registered; 253 u16 gpio_pushpull; 254 u16 gpio_altfunc; 255 u16 gpio_input; 256 #endif 257 u8 partnum; 258 u32 fw_version; 259 speed_t min_speed; 260 speed_t max_speed; 261 bool use_actual_rate; 262 bool no_flow_control; 263 bool no_event_mode; 264 }; 265 266 enum cp210x_event_state { 267 ES_DATA, 268 ES_ESCAPE, 269 ES_LSR, 270 ES_LSR_DATA_0, 271 ES_LSR_DATA_1, 272 ES_MSR 273 }; 274 275 struct cp210x_port_private { 276 u8 bInterfaceNumber; 277 bool event_mode; 278 enum cp210x_event_state event_state; 279 u8 lsr; 280 281 struct mutex mutex; 282 bool crtscts; 283 bool dtr; 284 bool rts; 285 }; 286 287 static struct usb_serial_driver cp210x_device = { 288 .driver = { 289 .owner = THIS_MODULE, 290 .name = "cp210x", 291 }, 292 .id_table = id_table, 293 .num_ports = 1, 294 .bulk_in_size = 256, 295 .bulk_out_size = 256, 296 .open = cp210x_open, 297 .close = cp210x_close, 298 .break_ctl = cp210x_break_ctl, 299 .set_termios = cp210x_set_termios, 300 .tx_empty = cp210x_tx_empty, 301 .throttle = usb_serial_generic_throttle, 302 .unthrottle = usb_serial_generic_unthrottle, 303 .tiocmget = cp210x_tiocmget, 304 .tiocmset = cp210x_tiocmset, 305 .get_icount = usb_serial_generic_get_icount, 306 .attach = cp210x_attach, 307 .disconnect = cp210x_disconnect, 308 .release = cp210x_release, 309 .port_probe = cp210x_port_probe, 310 .port_remove = cp210x_port_remove, 311 .dtr_rts = cp210x_dtr_rts, 312 .process_read_urb = cp210x_process_read_urb, 313 }; 314 315 static struct usb_serial_driver * const serial_drivers[] = { 316 &cp210x_device, NULL 317 }; 318 319 /* Config request types */ 320 #define REQTYPE_HOST_TO_INTERFACE 0x41 321 #define REQTYPE_INTERFACE_TO_HOST 0xc1 322 #define REQTYPE_HOST_TO_DEVICE 0x40 323 #define REQTYPE_DEVICE_TO_HOST 0xc0 324 325 /* Config request codes */ 326 #define CP210X_IFC_ENABLE 0x00 327 #define CP210X_SET_BAUDDIV 0x01 328 #define CP210X_GET_BAUDDIV 0x02 329 #define CP210X_SET_LINE_CTL 0x03 330 #define CP210X_GET_LINE_CTL 0x04 331 #define CP210X_SET_BREAK 0x05 332 #define CP210X_IMM_CHAR 0x06 333 #define CP210X_SET_MHS 0x07 334 #define CP210X_GET_MDMSTS 0x08 335 #define CP210X_SET_XON 0x09 336 #define CP210X_SET_XOFF 0x0A 337 #define CP210X_SET_EVENTMASK 0x0B 338 #define CP210X_GET_EVENTMASK 0x0C 339 #define CP210X_SET_CHAR 0x0D 340 #define CP210X_GET_CHARS 0x0E 341 #define CP210X_GET_PROPS 0x0F 342 #define CP210X_GET_COMM_STATUS 0x10 343 #define CP210X_RESET 0x11 344 #define CP210X_PURGE 0x12 345 #define CP210X_SET_FLOW 0x13 346 #define CP210X_GET_FLOW 0x14 347 #define CP210X_EMBED_EVENTS 0x15 348 #define CP210X_GET_EVENTSTATE 0x16 349 #define CP210X_SET_CHARS 0x19 350 #define CP210X_GET_BAUDRATE 0x1D 351 #define CP210X_SET_BAUDRATE 0x1E 352 #define CP210X_VENDOR_SPECIFIC 0xFF 353 354 /* CP210X_IFC_ENABLE */ 355 #define UART_ENABLE 0x0001 356 #define UART_DISABLE 0x0000 357 358 /* CP210X_(SET|GET)_BAUDDIV */ 359 #define BAUD_RATE_GEN_FREQ 0x384000 360 361 /* CP210X_(SET|GET)_LINE_CTL */ 362 #define BITS_DATA_MASK 0X0f00 363 #define BITS_DATA_5 0X0500 364 #define BITS_DATA_6 0X0600 365 #define BITS_DATA_7 0X0700 366 #define BITS_DATA_8 0X0800 367 #define BITS_DATA_9 0X0900 368 369 #define BITS_PARITY_MASK 0x00f0 370 #define BITS_PARITY_NONE 0x0000 371 #define BITS_PARITY_ODD 0x0010 372 #define BITS_PARITY_EVEN 0x0020 373 #define BITS_PARITY_MARK 0x0030 374 #define BITS_PARITY_SPACE 0x0040 375 376 #define BITS_STOP_MASK 0x000f 377 #define BITS_STOP_1 0x0000 378 #define BITS_STOP_1_5 0x0001 379 #define BITS_STOP_2 0x0002 380 381 /* CP210X_SET_BREAK */ 382 #define BREAK_ON 0x0001 383 #define BREAK_OFF 0x0000 384 385 /* CP210X_(SET_MHS|GET_MDMSTS) */ 386 #define CONTROL_DTR 0x0001 387 #define CONTROL_RTS 0x0002 388 #define CONTROL_CTS 0x0010 389 #define CONTROL_DSR 0x0020 390 #define CONTROL_RING 0x0040 391 #define CONTROL_DCD 0x0080 392 #define CONTROL_WRITE_DTR 0x0100 393 #define CONTROL_WRITE_RTS 0x0200 394 395 /* CP210X_(GET|SET)_CHARS */ 396 struct cp210x_special_chars { 397 u8 bEofChar; 398 u8 bErrorChar; 399 u8 bBreakChar; 400 u8 bEventChar; 401 u8 bXonChar; 402 u8 bXoffChar; 403 }; 404 405 /* CP210X_VENDOR_SPECIFIC values */ 406 #define CP210X_GET_FW_VER 0x000E 407 #define CP210X_READ_2NCONFIG 0x000E 408 #define CP210X_GET_FW_VER_2N 0x0010 409 #define CP210X_READ_LATCH 0x00C2 410 #define CP210X_GET_PARTNUM 0x370B 411 #define CP210X_GET_PORTCONFIG 0x370C 412 #define CP210X_GET_DEVICEMODE 0x3711 413 #define CP210X_WRITE_LATCH 0x37E1 414 415 /* Part number definitions */ 416 #define CP210X_PARTNUM_CP2101 0x01 417 #define CP210X_PARTNUM_CP2102 0x02 418 #define CP210X_PARTNUM_CP2103 0x03 419 #define CP210X_PARTNUM_CP2104 0x04 420 #define CP210X_PARTNUM_CP2105 0x05 421 #define CP210X_PARTNUM_CP2108 0x08 422 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 423 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 424 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 425 #define CP210X_PARTNUM_UNKNOWN 0xFF 426 427 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 428 struct cp210x_comm_status { 429 __le32 ulErrors; 430 __le32 ulHoldReasons; 431 __le32 ulAmountInInQueue; 432 __le32 ulAmountInOutQueue; 433 u8 bEofReceived; 434 u8 bWaitForImmediate; 435 u8 bReserved; 436 } __packed; 437 438 /* 439 * CP210X_PURGE - 16 bits passed in wValue of USB request. 440 * SiLabs app note AN571 gives a strange description of the 4 bits: 441 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 442 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 443 */ 444 #define PURGE_ALL 0x000f 445 446 /* CP210X_EMBED_EVENTS */ 447 #define CP210X_ESCCHAR 0xec 448 449 #define CP210X_LSR_OVERRUN BIT(1) 450 #define CP210X_LSR_PARITY BIT(2) 451 #define CP210X_LSR_FRAME BIT(3) 452 #define CP210X_LSR_BREAK BIT(4) 453 454 455 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 456 struct cp210x_flow_ctl { 457 __le32 ulControlHandshake; 458 __le32 ulFlowReplace; 459 __le32 ulXonLimit; 460 __le32 ulXoffLimit; 461 }; 462 463 /* cp210x_flow_ctl::ulControlHandshake */ 464 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 465 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 466 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 467 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 468 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 469 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 470 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 471 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 472 473 /* cp210x_flow_ctl::ulFlowReplace */ 474 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 475 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 476 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 477 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 478 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 479 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 480 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 481 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 482 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 483 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 484 485 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 486 struct cp210x_pin_mode { 487 u8 eci; 488 u8 sci; 489 }; 490 491 #define CP210X_PIN_MODE_MODEM 0 492 #define CP210X_PIN_MODE_GPIO BIT(0) 493 494 /* 495 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 496 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 497 */ 498 struct cp210x_dual_port_config { 499 __le16 gpio_mode; 500 u8 __pad0[2]; 501 __le16 reset_state; 502 u8 __pad1[4]; 503 __le16 suspend_state; 504 u8 sci_cfg; 505 u8 eci_cfg; 506 u8 device_cfg; 507 } __packed; 508 509 /* 510 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 511 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 512 */ 513 struct cp210x_single_port_config { 514 __le16 gpio_mode; 515 u8 __pad0[2]; 516 __le16 reset_state; 517 u8 __pad1[4]; 518 __le16 suspend_state; 519 u8 device_cfg; 520 } __packed; 521 522 /* GPIO modes */ 523 #define CP210X_SCI_GPIO_MODE_OFFSET 9 524 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 525 526 #define CP210X_ECI_GPIO_MODE_OFFSET 2 527 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 528 529 #define CP210X_GPIO_MODE_OFFSET 8 530 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 531 532 /* CP2105 port configuration values */ 533 #define CP2105_GPIO0_TXLED_MODE BIT(0) 534 #define CP2105_GPIO1_RXLED_MODE BIT(1) 535 #define CP2105_GPIO1_RS485_MODE BIT(2) 536 537 /* CP2104 port configuration values */ 538 #define CP2104_GPIO0_TXLED_MODE BIT(0) 539 #define CP2104_GPIO1_RXLED_MODE BIT(1) 540 #define CP2104_GPIO2_RS485_MODE BIT(2) 541 542 struct cp210x_quad_port_state { 543 __le16 gpio_mode_pb0; 544 __le16 gpio_mode_pb1; 545 __le16 gpio_mode_pb2; 546 __le16 gpio_mode_pb3; 547 __le16 gpio_mode_pb4; 548 549 __le16 gpio_lowpower_pb0; 550 __le16 gpio_lowpower_pb1; 551 __le16 gpio_lowpower_pb2; 552 __le16 gpio_lowpower_pb3; 553 __le16 gpio_lowpower_pb4; 554 555 __le16 gpio_latch_pb0; 556 __le16 gpio_latch_pb1; 557 __le16 gpio_latch_pb2; 558 __le16 gpio_latch_pb3; 559 __le16 gpio_latch_pb4; 560 }; 561 562 /* 563 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 564 * on a CP2108 chip. 565 * 566 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 567 */ 568 struct cp210x_quad_port_config { 569 struct cp210x_quad_port_state reset_state; 570 struct cp210x_quad_port_state suspend_state; 571 u8 ipdelay_ifc[4]; 572 u8 enhancedfxn_ifc[4]; 573 u8 enhancedfxn_device; 574 u8 extclkfreq[4]; 575 } __packed; 576 577 #define CP2108_EF_IFC_GPIO_TXLED 0x01 578 #define CP2108_EF_IFC_GPIO_RXLED 0x02 579 #define CP2108_EF_IFC_GPIO_RS485 0x04 580 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 581 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 582 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 583 584 /* CP2102N configuration array indices */ 585 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 586 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 587 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 588 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 589 590 /* CP2102N QFN20 port configuration values */ 591 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 592 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 593 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 594 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 595 596 /* 597 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 598 * for CP2102N, CP2103, CP2104 and CP2105. 599 */ 600 struct cp210x_gpio_write { 601 u8 mask; 602 u8 state; 603 }; 604 605 /* 606 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 607 * for CP2108. 608 */ 609 struct cp210x_gpio_write16 { 610 __le16 mask; 611 __le16 state; 612 }; 613 614 /* 615 * Helper to get interface number when we only have struct usb_serial. 616 */ 617 static u8 cp210x_interface_num(struct usb_serial *serial) 618 { 619 struct usb_host_interface *cur_altsetting; 620 621 cur_altsetting = serial->interface->cur_altsetting; 622 623 return cur_altsetting->desc.bInterfaceNumber; 624 } 625 626 /* 627 * Reads a variable-sized block of CP210X_ registers, identified by req. 628 * Returns data into buf in native USB byte order. 629 */ 630 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 631 void *buf, int bufsize) 632 { 633 struct usb_serial *serial = port->serial; 634 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 635 int result; 636 637 638 result = usb_control_msg_recv(serial->dev, 0, req, 639 REQTYPE_INTERFACE_TO_HOST, 0, 640 port_priv->bInterfaceNumber, buf, bufsize, 641 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 642 if (result) { 643 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 644 req, bufsize, result); 645 return result; 646 } 647 648 return 0; 649 } 650 651 /* 652 * Reads any 8-bit CP210X_ register identified by req. 653 */ 654 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 655 { 656 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 657 } 658 659 /* 660 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 661 * Returns data into buf in native USB byte order. 662 */ 663 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 664 void *buf, int bufsize) 665 { 666 int result; 667 668 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 669 type, val, cp210x_interface_num(serial), buf, bufsize, 670 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 671 if (result) { 672 dev_err(&serial->interface->dev, 673 "failed to get vendor val 0x%04x size %d: %d\n", val, 674 bufsize, result); 675 return result; 676 } 677 678 return 0; 679 } 680 681 /* 682 * Writes any 16-bit CP210X_ register (req) whose value is passed 683 * entirely in the wValue field of the USB request. 684 */ 685 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 686 { 687 struct usb_serial *serial = port->serial; 688 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 689 int result; 690 691 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 692 req, REQTYPE_HOST_TO_INTERFACE, val, 693 port_priv->bInterfaceNumber, NULL, 0, 694 USB_CTRL_SET_TIMEOUT); 695 if (result < 0) { 696 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 697 req, result); 698 } 699 700 return result; 701 } 702 703 /* 704 * Writes a variable-sized block of CP210X_ registers, identified by req. 705 * Data in buf must be in native USB byte order. 706 */ 707 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 708 void *buf, int bufsize) 709 { 710 struct usb_serial *serial = port->serial; 711 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 712 int result; 713 714 result = usb_control_msg_send(serial->dev, 0, req, 715 REQTYPE_HOST_TO_INTERFACE, 0, 716 port_priv->bInterfaceNumber, buf, bufsize, 717 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 718 if (result) { 719 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 720 req, bufsize, result); 721 return result; 722 } 723 724 return 0; 725 } 726 727 /* 728 * Writes any 32-bit CP210X_ register identified by req. 729 */ 730 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 731 { 732 __le32 le32_val; 733 734 le32_val = cpu_to_le32(val); 735 736 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 737 } 738 739 #ifdef CONFIG_GPIOLIB 740 /* 741 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 742 * Data in buf must be in native USB byte order. 743 */ 744 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 745 u16 val, void *buf, int bufsize) 746 { 747 int result; 748 749 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 750 type, val, cp210x_interface_num(serial), buf, bufsize, 751 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 752 if (result) { 753 dev_err(&serial->interface->dev, 754 "failed to set vendor val 0x%04x size %d: %d\n", val, 755 bufsize, result); 756 return result; 757 } 758 759 return 0; 760 } 761 #endif 762 763 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 764 { 765 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 766 int result; 767 768 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 769 if (result) { 770 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 771 return result; 772 } 773 774 if (tty) 775 cp210x_set_termios(tty, port, NULL); 776 777 result = usb_serial_generic_open(tty, port); 778 if (result) 779 goto err_disable; 780 781 return 0; 782 783 err_disable: 784 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 785 port_priv->event_mode = false; 786 787 return result; 788 } 789 790 static void cp210x_close(struct usb_serial_port *port) 791 { 792 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 793 794 usb_serial_generic_close(port); 795 796 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 797 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 798 799 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 800 801 /* Disabling the interface disables event-insertion mode. */ 802 port_priv->event_mode = false; 803 } 804 805 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 806 { 807 if (lsr & CP210X_LSR_BREAK) { 808 port->icount.brk++; 809 *flag = TTY_BREAK; 810 } else if (lsr & CP210X_LSR_PARITY) { 811 port->icount.parity++; 812 *flag = TTY_PARITY; 813 } else if (lsr & CP210X_LSR_FRAME) { 814 port->icount.frame++; 815 *flag = TTY_FRAME; 816 } 817 818 if (lsr & CP210X_LSR_OVERRUN) { 819 port->icount.overrun++; 820 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 821 } 822 } 823 824 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 825 { 826 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 827 828 switch (port_priv->event_state) { 829 case ES_DATA: 830 if (*ch == CP210X_ESCCHAR) { 831 port_priv->event_state = ES_ESCAPE; 832 break; 833 } 834 return false; 835 case ES_ESCAPE: 836 switch (*ch) { 837 case 0: 838 dev_dbg(&port->dev, "%s - escape char\n", __func__); 839 *ch = CP210X_ESCCHAR; 840 port_priv->event_state = ES_DATA; 841 return false; 842 case 1: 843 port_priv->event_state = ES_LSR_DATA_0; 844 break; 845 case 2: 846 port_priv->event_state = ES_LSR; 847 break; 848 case 3: 849 port_priv->event_state = ES_MSR; 850 break; 851 default: 852 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 853 port_priv->event_state = ES_DATA; 854 break; 855 } 856 break; 857 case ES_LSR_DATA_0: 858 port_priv->lsr = *ch; 859 port_priv->event_state = ES_LSR_DATA_1; 860 break; 861 case ES_LSR_DATA_1: 862 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 863 __func__, port_priv->lsr, *ch); 864 cp210x_process_lsr(port, port_priv->lsr, flag); 865 port_priv->event_state = ES_DATA; 866 return false; 867 case ES_LSR: 868 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 869 port_priv->lsr = *ch; 870 cp210x_process_lsr(port, port_priv->lsr, flag); 871 port_priv->event_state = ES_DATA; 872 break; 873 case ES_MSR: 874 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 875 /* unimplemented */ 876 port_priv->event_state = ES_DATA; 877 break; 878 } 879 880 return true; 881 } 882 883 static void cp210x_process_read_urb(struct urb *urb) 884 { 885 struct usb_serial_port *port = urb->context; 886 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 887 unsigned char *ch = urb->transfer_buffer; 888 char flag; 889 int i; 890 891 if (!urb->actual_length) 892 return; 893 894 if (port_priv->event_mode) { 895 for (i = 0; i < urb->actual_length; i++, ch++) { 896 flag = TTY_NORMAL; 897 898 if (cp210x_process_char(port, ch, &flag)) 899 continue; 900 901 tty_insert_flip_char(&port->port, *ch, flag); 902 } 903 } else { 904 tty_insert_flip_string(&port->port, ch, urb->actual_length); 905 } 906 tty_flip_buffer_push(&port->port); 907 } 908 909 /* 910 * Read how many bytes are waiting in the TX queue. 911 */ 912 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 913 u32 *count) 914 { 915 struct usb_serial *serial = port->serial; 916 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 917 struct cp210x_comm_status sts; 918 int result; 919 920 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 921 REQTYPE_INTERFACE_TO_HOST, 0, 922 port_priv->bInterfaceNumber, &sts, sizeof(sts), 923 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 924 if (result) { 925 dev_err(&port->dev, "failed to get comm status: %d\n", result); 926 return result; 927 } 928 929 *count = le32_to_cpu(sts.ulAmountInOutQueue); 930 931 return 0; 932 } 933 934 static bool cp210x_tx_empty(struct usb_serial_port *port) 935 { 936 int err; 937 u32 count; 938 939 err = cp210x_get_tx_queue_byte_count(port, &count); 940 if (err) 941 return true; 942 943 return !count; 944 } 945 946 struct cp210x_rate { 947 speed_t rate; 948 speed_t high; 949 }; 950 951 static const struct cp210x_rate cp210x_an205_table1[] = { 952 { 300, 300 }, 953 { 600, 600 }, 954 { 1200, 1200 }, 955 { 1800, 1800 }, 956 { 2400, 2400 }, 957 { 4000, 4000 }, 958 { 4800, 4803 }, 959 { 7200, 7207 }, 960 { 9600, 9612 }, 961 { 14400, 14428 }, 962 { 16000, 16062 }, 963 { 19200, 19250 }, 964 { 28800, 28912 }, 965 { 38400, 38601 }, 966 { 51200, 51558 }, 967 { 56000, 56280 }, 968 { 57600, 58053 }, 969 { 64000, 64111 }, 970 { 76800, 77608 }, 971 { 115200, 117028 }, 972 { 128000, 129347 }, 973 { 153600, 156868 }, 974 { 230400, 237832 }, 975 { 250000, 254234 }, 976 { 256000, 273066 }, 977 { 460800, 491520 }, 978 { 500000, 567138 }, 979 { 576000, 670254 }, 980 { 921600, UINT_MAX } 981 }; 982 983 /* 984 * Quantises the baud rate as per AN205 Table 1 985 */ 986 static speed_t cp210x_get_an205_rate(speed_t baud) 987 { 988 int i; 989 990 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 991 if (baud <= cp210x_an205_table1[i].high) 992 break; 993 } 994 995 return cp210x_an205_table1[i].rate; 996 } 997 998 static speed_t cp210x_get_actual_rate(speed_t baud) 999 { 1000 unsigned int prescale = 1; 1001 unsigned int div; 1002 1003 if (baud <= 365) 1004 prescale = 4; 1005 1006 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1007 baud = 48000000 / (2 * prescale * div); 1008 1009 return baud; 1010 } 1011 1012 /* 1013 * CP2101 supports the following baud rates: 1014 * 1015 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1016 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1017 * 1018 * CP2102 and CP2103 support the following additional rates: 1019 * 1020 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1021 * 576000 1022 * 1023 * The device will map a requested rate to a supported one, but the result 1024 * of requests for rates greater than 1053257 is undefined (see AN205). 1025 * 1026 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1027 * respectively, with an error less than 1%. The actual rates are determined 1028 * by 1029 * 1030 * div = round(freq / (2 x prescale x request)) 1031 * actual = freq / (2 x prescale x div) 1032 * 1033 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1034 * or 1 otherwise. 1035 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1036 * otherwise. 1037 */ 1038 static void cp210x_change_speed(struct tty_struct *tty, 1039 struct usb_serial_port *port, struct ktermios *old_termios) 1040 { 1041 struct usb_serial *serial = port->serial; 1042 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1043 u32 baud; 1044 1045 /* 1046 * This maps the requested rate to the actual rate, a valid rate on 1047 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1048 * 1049 * NOTE: B0 is not implemented. 1050 */ 1051 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1052 1053 if (priv->use_actual_rate) 1054 baud = cp210x_get_actual_rate(baud); 1055 else if (baud < 1000000) 1056 baud = cp210x_get_an205_rate(baud); 1057 1058 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1059 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1060 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1061 if (old_termios) 1062 baud = old_termios->c_ospeed; 1063 else 1064 baud = 9600; 1065 } 1066 1067 tty_encode_baud_rate(tty, baud, baud); 1068 } 1069 1070 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1071 { 1072 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1073 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1074 int ret; 1075 1076 if (port_priv->event_mode) 1077 return; 1078 1079 if (priv->no_event_mode) 1080 return; 1081 1082 port_priv->event_state = ES_DATA; 1083 port_priv->event_mode = true; 1084 1085 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1086 if (ret) { 1087 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1088 port_priv->event_mode = false; 1089 } 1090 } 1091 1092 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1093 { 1094 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1095 int ret; 1096 1097 if (!port_priv->event_mode) 1098 return; 1099 1100 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1101 if (ret) { 1102 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1103 return; 1104 } 1105 1106 port_priv->event_mode = false; 1107 } 1108 1109 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1110 { 1111 bool iflag_change, cc_change; 1112 1113 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1114 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1115 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1116 1117 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1118 } 1119 1120 static void cp210x_set_flow_control(struct tty_struct *tty, 1121 struct usb_serial_port *port, struct ktermios *old_termios) 1122 { 1123 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1124 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1125 struct cp210x_special_chars chars; 1126 struct cp210x_flow_ctl flow_ctl; 1127 u32 flow_repl; 1128 u32 ctl_hs; 1129 bool crtscts; 1130 int ret; 1131 1132 /* 1133 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1134 * CP2102N_E104). Report back that flow control is not supported. 1135 */ 1136 if (priv->no_flow_control) { 1137 tty->termios.c_cflag &= ~CRTSCTS; 1138 tty->termios.c_iflag &= ~(IXON | IXOFF); 1139 } 1140 1141 if (old_termios && 1142 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1143 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1144 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1145 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1146 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1147 return; 1148 } 1149 1150 if (I_IXON(tty) || I_IXOFF(tty)) { 1151 memset(&chars, 0, sizeof(chars)); 1152 1153 chars.bXonChar = START_CHAR(tty); 1154 chars.bXoffChar = STOP_CHAR(tty); 1155 1156 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1157 sizeof(chars)); 1158 if (ret) { 1159 dev_err(&port->dev, "failed to set special chars: %d\n", 1160 ret); 1161 } 1162 } 1163 1164 mutex_lock(&port_priv->mutex); 1165 1166 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1167 sizeof(flow_ctl)); 1168 if (ret) 1169 goto out_unlock; 1170 1171 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1172 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1173 1174 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1175 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1176 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1177 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1178 if (port_priv->dtr) 1179 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1180 else 1181 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1182 1183 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1184 if (C_CRTSCTS(tty)) { 1185 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1186 if (port_priv->rts) 1187 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1188 else 1189 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1190 crtscts = true; 1191 } else { 1192 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1193 if (port_priv->rts) 1194 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1195 else 1196 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1197 crtscts = false; 1198 } 1199 1200 if (I_IXOFF(tty)) { 1201 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1202 1203 flow_ctl.ulXonLimit = cpu_to_le32(128); 1204 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1205 } else { 1206 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1207 } 1208 1209 if (I_IXON(tty)) 1210 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1211 else 1212 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1213 1214 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1215 ctl_hs, flow_repl); 1216 1217 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1218 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1219 1220 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1221 sizeof(flow_ctl)); 1222 if (ret) 1223 goto out_unlock; 1224 1225 port_priv->crtscts = crtscts; 1226 out_unlock: 1227 mutex_unlock(&port_priv->mutex); 1228 } 1229 1230 static void cp210x_set_termios(struct tty_struct *tty, 1231 struct usb_serial_port *port, struct ktermios *old_termios) 1232 { 1233 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1234 u16 bits; 1235 int ret; 1236 1237 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1238 return; 1239 1240 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1241 cp210x_change_speed(tty, port, old_termios); 1242 1243 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1244 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1245 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1246 tty->termios.c_cflag |= CS8; 1247 } 1248 1249 bits = 0; 1250 1251 switch (C_CSIZE(tty)) { 1252 case CS5: 1253 bits |= BITS_DATA_5; 1254 break; 1255 case CS6: 1256 bits |= BITS_DATA_6; 1257 break; 1258 case CS7: 1259 bits |= BITS_DATA_7; 1260 break; 1261 case CS8: 1262 default: 1263 bits |= BITS_DATA_8; 1264 break; 1265 } 1266 1267 if (C_PARENB(tty)) { 1268 if (C_CMSPAR(tty)) { 1269 if (C_PARODD(tty)) 1270 bits |= BITS_PARITY_MARK; 1271 else 1272 bits |= BITS_PARITY_SPACE; 1273 } else { 1274 if (C_PARODD(tty)) 1275 bits |= BITS_PARITY_ODD; 1276 else 1277 bits |= BITS_PARITY_EVEN; 1278 } 1279 } 1280 1281 if (C_CSTOPB(tty)) 1282 bits |= BITS_STOP_2; 1283 else 1284 bits |= BITS_STOP_1; 1285 1286 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1287 if (ret) 1288 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1289 1290 cp210x_set_flow_control(tty, port, old_termios); 1291 1292 /* 1293 * Enable event-insertion mode only if input parity checking is 1294 * enabled for now. 1295 */ 1296 if (I_INPCK(tty)) 1297 cp210x_enable_event_mode(port); 1298 else 1299 cp210x_disable_event_mode(port); 1300 } 1301 1302 static int cp210x_tiocmset(struct tty_struct *tty, 1303 unsigned int set, unsigned int clear) 1304 { 1305 struct usb_serial_port *port = tty->driver_data; 1306 return cp210x_tiocmset_port(port, set, clear); 1307 } 1308 1309 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1310 unsigned int set, unsigned int clear) 1311 { 1312 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1313 struct cp210x_flow_ctl flow_ctl; 1314 u32 ctl_hs, flow_repl; 1315 u16 control = 0; 1316 int ret; 1317 1318 mutex_lock(&port_priv->mutex); 1319 1320 if (set & TIOCM_RTS) { 1321 port_priv->rts = true; 1322 control |= CONTROL_RTS; 1323 control |= CONTROL_WRITE_RTS; 1324 } 1325 if (set & TIOCM_DTR) { 1326 port_priv->dtr = true; 1327 control |= CONTROL_DTR; 1328 control |= CONTROL_WRITE_DTR; 1329 } 1330 if (clear & TIOCM_RTS) { 1331 port_priv->rts = false; 1332 control &= ~CONTROL_RTS; 1333 control |= CONTROL_WRITE_RTS; 1334 } 1335 if (clear & TIOCM_DTR) { 1336 port_priv->dtr = false; 1337 control &= ~CONTROL_DTR; 1338 control |= CONTROL_WRITE_DTR; 1339 } 1340 1341 /* 1342 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1343 * flow control is enabled. 1344 */ 1345 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1346 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1347 sizeof(flow_ctl)); 1348 if (ret) 1349 goto out_unlock; 1350 1351 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1352 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1353 1354 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1355 if (port_priv->dtr) 1356 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1357 else 1358 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1359 1360 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1361 if (port_priv->rts) 1362 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1363 else 1364 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1365 1366 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1367 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1368 1369 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1370 __func__, ctl_hs, flow_repl); 1371 1372 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1373 sizeof(flow_ctl)); 1374 } else { 1375 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1376 1377 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1378 } 1379 out_unlock: 1380 mutex_unlock(&port_priv->mutex); 1381 1382 return ret; 1383 } 1384 1385 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1386 { 1387 if (on) 1388 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1389 else 1390 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1391 } 1392 1393 static int cp210x_tiocmget(struct tty_struct *tty) 1394 { 1395 struct usb_serial_port *port = tty->driver_data; 1396 u8 control; 1397 int result; 1398 1399 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1400 if (result) 1401 return result; 1402 1403 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1404 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1405 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1406 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1407 |((control & CONTROL_RING)? TIOCM_RI : 0) 1408 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1409 1410 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1411 1412 return result; 1413 } 1414 1415 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1416 { 1417 struct usb_serial_port *port = tty->driver_data; 1418 u16 state; 1419 1420 if (break_state == 0) 1421 state = BREAK_OFF; 1422 else 1423 state = BREAK_ON; 1424 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1425 state == BREAK_OFF ? "off" : "on"); 1426 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1427 } 1428 1429 #ifdef CONFIG_GPIOLIB 1430 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1431 { 1432 struct usb_serial *serial = gpiochip_get_data(gc); 1433 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1434 u8 req_type; 1435 u16 mask; 1436 int result; 1437 int len; 1438 1439 result = usb_autopm_get_interface(serial->interface); 1440 if (result) 1441 return result; 1442 1443 switch (priv->partnum) { 1444 case CP210X_PARTNUM_CP2105: 1445 req_type = REQTYPE_INTERFACE_TO_HOST; 1446 len = 1; 1447 break; 1448 case CP210X_PARTNUM_CP2108: 1449 req_type = REQTYPE_INTERFACE_TO_HOST; 1450 len = 2; 1451 break; 1452 default: 1453 req_type = REQTYPE_DEVICE_TO_HOST; 1454 len = 1; 1455 break; 1456 } 1457 1458 mask = 0; 1459 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1460 &mask, len); 1461 1462 usb_autopm_put_interface(serial->interface); 1463 1464 if (result < 0) 1465 return result; 1466 1467 le16_to_cpus(&mask); 1468 1469 return !!(mask & BIT(gpio)); 1470 } 1471 1472 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1473 { 1474 struct usb_serial *serial = gpiochip_get_data(gc); 1475 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1476 struct cp210x_gpio_write16 buf16; 1477 struct cp210x_gpio_write buf; 1478 u16 mask, state; 1479 u16 wIndex; 1480 int result; 1481 1482 if (value == 1) 1483 state = BIT(gpio); 1484 else 1485 state = 0; 1486 1487 mask = BIT(gpio); 1488 1489 result = usb_autopm_get_interface(serial->interface); 1490 if (result) 1491 goto out; 1492 1493 switch (priv->partnum) { 1494 case CP210X_PARTNUM_CP2105: 1495 buf.mask = (u8)mask; 1496 buf.state = (u8)state; 1497 result = cp210x_write_vendor_block(serial, 1498 REQTYPE_HOST_TO_INTERFACE, 1499 CP210X_WRITE_LATCH, &buf, 1500 sizeof(buf)); 1501 break; 1502 case CP210X_PARTNUM_CP2108: 1503 buf16.mask = cpu_to_le16(mask); 1504 buf16.state = cpu_to_le16(state); 1505 result = cp210x_write_vendor_block(serial, 1506 REQTYPE_HOST_TO_INTERFACE, 1507 CP210X_WRITE_LATCH, &buf16, 1508 sizeof(buf16)); 1509 break; 1510 default: 1511 wIndex = state << 8 | mask; 1512 result = usb_control_msg(serial->dev, 1513 usb_sndctrlpipe(serial->dev, 0), 1514 CP210X_VENDOR_SPECIFIC, 1515 REQTYPE_HOST_TO_DEVICE, 1516 CP210X_WRITE_LATCH, 1517 wIndex, 1518 NULL, 0, USB_CTRL_SET_TIMEOUT); 1519 break; 1520 } 1521 1522 usb_autopm_put_interface(serial->interface); 1523 out: 1524 if (result < 0) { 1525 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1526 result); 1527 } 1528 } 1529 1530 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1531 { 1532 struct usb_serial *serial = gpiochip_get_data(gc); 1533 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1534 1535 return priv->gpio_input & BIT(gpio); 1536 } 1537 1538 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1539 { 1540 struct usb_serial *serial = gpiochip_get_data(gc); 1541 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1542 1543 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1544 /* hardware does not support an input mode */ 1545 return -ENOTSUPP; 1546 } 1547 1548 /* push-pull pins cannot be changed to be inputs */ 1549 if (priv->gpio_pushpull & BIT(gpio)) 1550 return -EINVAL; 1551 1552 /* make sure to release pin if it is being driven low */ 1553 cp210x_gpio_set(gc, gpio, 1); 1554 1555 priv->gpio_input |= BIT(gpio); 1556 1557 return 0; 1558 } 1559 1560 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1561 int value) 1562 { 1563 struct usb_serial *serial = gpiochip_get_data(gc); 1564 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1565 1566 priv->gpio_input &= ~BIT(gpio); 1567 cp210x_gpio_set(gc, gpio, value); 1568 1569 return 0; 1570 } 1571 1572 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1573 unsigned long config) 1574 { 1575 struct usb_serial *serial = gpiochip_get_data(gc); 1576 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1577 enum pin_config_param param = pinconf_to_config_param(config); 1578 1579 /* Succeed only if in correct mode (this can't be set at runtime) */ 1580 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1581 (priv->gpio_pushpull & BIT(gpio))) 1582 return 0; 1583 1584 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1585 !(priv->gpio_pushpull & BIT(gpio))) 1586 return 0; 1587 1588 return -ENOTSUPP; 1589 } 1590 1591 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1592 unsigned long *valid_mask, unsigned int ngpios) 1593 { 1594 struct usb_serial *serial = gpiochip_get_data(gc); 1595 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1596 struct device *dev = &serial->interface->dev; 1597 unsigned long altfunc_mask = priv->gpio_altfunc; 1598 1599 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1600 1601 if (bitmap_empty(valid_mask, ngpios)) 1602 dev_dbg(dev, "no pin configured for GPIO\n"); 1603 else 1604 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1605 valid_mask); 1606 return 0; 1607 } 1608 1609 /* 1610 * This function is for configuring GPIO using shared pins, where other signals 1611 * are made unavailable by configuring the use of GPIO. This is believed to be 1612 * only applicable to the cp2105 at this point, the other devices supported by 1613 * this driver that provide GPIO do so in a way that does not impact other 1614 * signals and are thus expected to have very different initialisation. 1615 */ 1616 static int cp2105_gpioconf_init(struct usb_serial *serial) 1617 { 1618 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1619 struct cp210x_pin_mode mode; 1620 struct cp210x_dual_port_config config; 1621 u8 intf_num = cp210x_interface_num(serial); 1622 u8 iface_config; 1623 int result; 1624 1625 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1626 CP210X_GET_DEVICEMODE, &mode, 1627 sizeof(mode)); 1628 if (result < 0) 1629 return result; 1630 1631 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1632 CP210X_GET_PORTCONFIG, &config, 1633 sizeof(config)); 1634 if (result < 0) 1635 return result; 1636 1637 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1638 if (intf_num == 0) { 1639 priv->gc.ngpio = 2; 1640 1641 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1642 /* mark all GPIOs of this interface as reserved */ 1643 priv->gpio_altfunc = 0xff; 1644 return 0; 1645 } 1646 1647 iface_config = config.eci_cfg; 1648 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1649 CP210X_ECI_GPIO_MODE_MASK) >> 1650 CP210X_ECI_GPIO_MODE_OFFSET); 1651 } else if (intf_num == 1) { 1652 priv->gc.ngpio = 3; 1653 1654 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1655 /* mark all GPIOs of this interface as reserved */ 1656 priv->gpio_altfunc = 0xff; 1657 return 0; 1658 } 1659 1660 iface_config = config.sci_cfg; 1661 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1662 CP210X_SCI_GPIO_MODE_MASK) >> 1663 CP210X_SCI_GPIO_MODE_OFFSET); 1664 } else { 1665 return -ENODEV; 1666 } 1667 1668 /* mark all pins which are not in GPIO mode */ 1669 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1670 priv->gpio_altfunc |= BIT(0); 1671 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1672 CP2105_GPIO1_RS485_MODE)) 1673 priv->gpio_altfunc |= BIT(1); 1674 1675 /* driver implementation for CP2105 only supports outputs */ 1676 priv->gpio_input = 0; 1677 1678 return 0; 1679 } 1680 1681 static int cp2104_gpioconf_init(struct usb_serial *serial) 1682 { 1683 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1684 struct cp210x_single_port_config config; 1685 u8 iface_config; 1686 u8 gpio_latch; 1687 int result; 1688 u8 i; 1689 1690 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1691 CP210X_GET_PORTCONFIG, &config, 1692 sizeof(config)); 1693 if (result < 0) 1694 return result; 1695 1696 priv->gc.ngpio = 4; 1697 1698 iface_config = config.device_cfg; 1699 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1700 CP210X_GPIO_MODE_MASK) >> 1701 CP210X_GPIO_MODE_OFFSET); 1702 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1703 CP210X_GPIO_MODE_MASK) >> 1704 CP210X_GPIO_MODE_OFFSET); 1705 1706 /* mark all pins which are not in GPIO mode */ 1707 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1708 priv->gpio_altfunc |= BIT(0); 1709 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1710 priv->gpio_altfunc |= BIT(1); 1711 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1712 priv->gpio_altfunc |= BIT(2); 1713 1714 /* 1715 * Like CP2102N, CP2104 has also no strict input and output pin 1716 * modes. 1717 * Do the same input mode emulation as CP2102N. 1718 */ 1719 for (i = 0; i < priv->gc.ngpio; ++i) { 1720 /* 1721 * Set direction to "input" iff pin is open-drain and reset 1722 * value is 1. 1723 */ 1724 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1725 priv->gpio_input |= BIT(i); 1726 } 1727 1728 return 0; 1729 } 1730 1731 static int cp2108_gpio_init(struct usb_serial *serial) 1732 { 1733 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1734 struct cp210x_quad_port_config config; 1735 u16 gpio_latch; 1736 int result; 1737 u8 i; 1738 1739 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1740 CP210X_GET_PORTCONFIG, &config, 1741 sizeof(config)); 1742 if (result < 0) 1743 return result; 1744 1745 priv->gc.ngpio = 16; 1746 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1747 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1748 1749 /* 1750 * Mark all pins which are not in GPIO mode. 1751 * 1752 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1753 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1754 * 1755 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1756 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1757 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1758 */ 1759 for (i = 0; i < 4; i++) { 1760 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1761 priv->gpio_altfunc |= BIT(i * 4); 1762 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1763 priv->gpio_altfunc |= BIT((i * 4) + 1); 1764 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1765 priv->gpio_altfunc |= BIT((i * 4) + 2); 1766 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1767 priv->gpio_altfunc |= BIT((i * 4) + 3); 1768 } 1769 1770 /* 1771 * Like CP2102N, CP2108 has also no strict input and output pin 1772 * modes. Do the same input mode emulation as CP2102N. 1773 */ 1774 for (i = 0; i < priv->gc.ngpio; ++i) { 1775 /* 1776 * Set direction to "input" iff pin is open-drain and reset 1777 * value is 1. 1778 */ 1779 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1780 priv->gpio_input |= BIT(i); 1781 } 1782 1783 return 0; 1784 } 1785 1786 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1787 { 1788 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1789 const u16 config_size = 0x02a6; 1790 u8 gpio_rst_latch; 1791 u8 config_version; 1792 u8 gpio_pushpull; 1793 u8 *config_buf; 1794 u8 gpio_latch; 1795 u8 gpio_ctrl; 1796 int result; 1797 u8 i; 1798 1799 /* 1800 * Retrieve device configuration from the device. 1801 * The array received contains all customization settings done at the 1802 * factory/manufacturer. Format of the array is documented at the 1803 * time of writing at: 1804 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1805 */ 1806 config_buf = kmalloc(config_size, GFP_KERNEL); 1807 if (!config_buf) 1808 return -ENOMEM; 1809 1810 result = cp210x_read_vendor_block(serial, 1811 REQTYPE_DEVICE_TO_HOST, 1812 CP210X_READ_2NCONFIG, 1813 config_buf, 1814 config_size); 1815 if (result < 0) { 1816 kfree(config_buf); 1817 return result; 1818 } 1819 1820 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1821 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1822 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1823 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1824 1825 kfree(config_buf); 1826 1827 /* Make sure this is a config format we understand. */ 1828 if (config_version != 0x01) 1829 return -ENOTSUPP; 1830 1831 priv->gc.ngpio = 4; 1832 1833 /* 1834 * Get default pin states after reset. Needed so we can determine 1835 * the direction of an open-drain pin. 1836 */ 1837 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1838 1839 /* 0 indicates open-drain mode, 1 is push-pull */ 1840 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1841 1842 /* 0 indicates GPIO mode, 1 is alternate function */ 1843 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1844 /* QFN20 is special... */ 1845 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1846 priv->gpio_altfunc |= BIT(0); 1847 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1848 priv->gpio_altfunc |= BIT(1); 1849 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1850 priv->gpio_altfunc |= BIT(2); 1851 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1852 priv->gpio_altfunc |= BIT(3); 1853 } else { 1854 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1855 } 1856 1857 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1858 /* 1859 * For the QFN28 package, GPIO4-6 are controlled by 1860 * the low three bits of the mode/latch fields. 1861 * Contrary to the document linked above, the bits for 1862 * the SUSPEND pins are elsewhere. No alternate 1863 * function is available for these pins. 1864 */ 1865 priv->gc.ngpio = 7; 1866 gpio_latch |= (gpio_rst_latch & 7) << 4; 1867 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1868 } 1869 1870 /* 1871 * The CP2102N does not strictly has input and output pin modes, 1872 * it only knows open-drain and push-pull modes which is set at 1873 * factory. An open-drain pin can function both as an 1874 * input or an output. We emulate input mode for open-drain pins 1875 * by making sure they are not driven low, and we do not allow 1876 * push-pull pins to be set as an input. 1877 */ 1878 for (i = 0; i < priv->gc.ngpio; ++i) { 1879 /* 1880 * Set direction to "input" iff pin is open-drain and reset 1881 * value is 1. 1882 */ 1883 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1884 priv->gpio_input |= BIT(i); 1885 } 1886 1887 return 0; 1888 } 1889 1890 static int cp210x_gpio_init(struct usb_serial *serial) 1891 { 1892 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1893 int result; 1894 1895 switch (priv->partnum) { 1896 case CP210X_PARTNUM_CP2104: 1897 result = cp2104_gpioconf_init(serial); 1898 break; 1899 case CP210X_PARTNUM_CP2105: 1900 result = cp2105_gpioconf_init(serial); 1901 break; 1902 case CP210X_PARTNUM_CP2108: 1903 /* 1904 * The GPIOs are not tied to any specific port so only register 1905 * once for interface 0. 1906 */ 1907 if (cp210x_interface_num(serial) != 0) 1908 return 0; 1909 result = cp2108_gpio_init(serial); 1910 break; 1911 case CP210X_PARTNUM_CP2102N_QFN28: 1912 case CP210X_PARTNUM_CP2102N_QFN24: 1913 case CP210X_PARTNUM_CP2102N_QFN20: 1914 result = cp2102n_gpioconf_init(serial); 1915 break; 1916 default: 1917 return 0; 1918 } 1919 1920 if (result < 0) 1921 return result; 1922 1923 priv->gc.label = "cp210x"; 1924 priv->gc.get_direction = cp210x_gpio_direction_get; 1925 priv->gc.direction_input = cp210x_gpio_direction_input; 1926 priv->gc.direction_output = cp210x_gpio_direction_output; 1927 priv->gc.get = cp210x_gpio_get; 1928 priv->gc.set = cp210x_gpio_set; 1929 priv->gc.set_config = cp210x_gpio_set_config; 1930 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1931 priv->gc.owner = THIS_MODULE; 1932 priv->gc.parent = &serial->interface->dev; 1933 priv->gc.base = -1; 1934 priv->gc.can_sleep = true; 1935 1936 result = gpiochip_add_data(&priv->gc, serial); 1937 if (!result) 1938 priv->gpio_registered = true; 1939 1940 return result; 1941 } 1942 1943 static void cp210x_gpio_remove(struct usb_serial *serial) 1944 { 1945 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1946 1947 if (priv->gpio_registered) { 1948 gpiochip_remove(&priv->gc); 1949 priv->gpio_registered = false; 1950 } 1951 } 1952 1953 #else 1954 1955 static int cp210x_gpio_init(struct usb_serial *serial) 1956 { 1957 return 0; 1958 } 1959 1960 static void cp210x_gpio_remove(struct usb_serial *serial) 1961 { 1962 /* Nothing to do */ 1963 } 1964 1965 #endif 1966 1967 static int cp210x_port_probe(struct usb_serial_port *port) 1968 { 1969 struct usb_serial *serial = port->serial; 1970 struct cp210x_port_private *port_priv; 1971 1972 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1973 if (!port_priv) 1974 return -ENOMEM; 1975 1976 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1977 mutex_init(&port_priv->mutex); 1978 1979 usb_set_serial_port_data(port, port_priv); 1980 1981 return 0; 1982 } 1983 1984 static void cp210x_port_remove(struct usb_serial_port *port) 1985 { 1986 struct cp210x_port_private *port_priv; 1987 1988 port_priv = usb_get_serial_port_data(port); 1989 kfree(port_priv); 1990 } 1991 1992 static void cp210x_init_max_speed(struct usb_serial *serial) 1993 { 1994 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1995 bool use_actual_rate = false; 1996 speed_t min = 300; 1997 speed_t max; 1998 1999 switch (priv->partnum) { 2000 case CP210X_PARTNUM_CP2101: 2001 max = 921600; 2002 break; 2003 case CP210X_PARTNUM_CP2102: 2004 case CP210X_PARTNUM_CP2103: 2005 max = 1000000; 2006 break; 2007 case CP210X_PARTNUM_CP2104: 2008 use_actual_rate = true; 2009 max = 2000000; 2010 break; 2011 case CP210X_PARTNUM_CP2108: 2012 max = 2000000; 2013 break; 2014 case CP210X_PARTNUM_CP2105: 2015 if (cp210x_interface_num(serial) == 0) { 2016 use_actual_rate = true; 2017 max = 2000000; /* ECI */ 2018 } else { 2019 min = 2400; 2020 max = 921600; /* SCI */ 2021 } 2022 break; 2023 case CP210X_PARTNUM_CP2102N_QFN28: 2024 case CP210X_PARTNUM_CP2102N_QFN24: 2025 case CP210X_PARTNUM_CP2102N_QFN20: 2026 use_actual_rate = true; 2027 max = 3000000; 2028 break; 2029 default: 2030 max = 2000000; 2031 break; 2032 } 2033 2034 priv->min_speed = min; 2035 priv->max_speed = max; 2036 priv->use_actual_rate = use_actual_rate; 2037 } 2038 2039 static void cp2102_determine_quirks(struct usb_serial *serial) 2040 { 2041 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2042 u8 *buf; 2043 int ret; 2044 2045 buf = kmalloc(2, GFP_KERNEL); 2046 if (!buf) 2047 return; 2048 /* 2049 * Some (possibly counterfeit) CP2102 do not support event-insertion 2050 * mode and respond differently to malformed vendor requests. 2051 * Specifically, they return one instead of two bytes when sent a 2052 * two-byte part-number request. 2053 */ 2054 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2055 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2056 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2057 if (ret == 1) { 2058 dev_dbg(&serial->interface->dev, 2059 "device does not support event-insertion mode\n"); 2060 priv->no_event_mode = true; 2061 } 2062 2063 kfree(buf); 2064 } 2065 2066 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2067 { 2068 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2069 u8 ver[3]; 2070 int ret; 2071 2072 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2073 ver, sizeof(ver)); 2074 if (ret) 2075 return ret; 2076 2077 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2078 ver[0], ver[1], ver[2]); 2079 2080 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2081 2082 return 0; 2083 } 2084 2085 static void cp210x_determine_type(struct usb_serial *serial) 2086 { 2087 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2088 int ret; 2089 2090 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2091 CP210X_GET_PARTNUM, &priv->partnum, 2092 sizeof(priv->partnum)); 2093 if (ret < 0) { 2094 dev_warn(&serial->interface->dev, 2095 "querying part number failed\n"); 2096 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2097 return; 2098 } 2099 2100 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2101 2102 switch (priv->partnum) { 2103 case CP210X_PARTNUM_CP2102: 2104 cp2102_determine_quirks(serial); 2105 break; 2106 case CP210X_PARTNUM_CP2105: 2107 case CP210X_PARTNUM_CP2108: 2108 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2109 break; 2110 case CP210X_PARTNUM_CP2102N_QFN28: 2111 case CP210X_PARTNUM_CP2102N_QFN24: 2112 case CP210X_PARTNUM_CP2102N_QFN20: 2113 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2114 if (ret) 2115 break; 2116 if (priv->fw_version <= 0x10004) 2117 priv->no_flow_control = true; 2118 break; 2119 default: 2120 break; 2121 } 2122 } 2123 2124 static int cp210x_attach(struct usb_serial *serial) 2125 { 2126 int result; 2127 struct cp210x_serial_private *priv; 2128 2129 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2130 if (!priv) 2131 return -ENOMEM; 2132 2133 usb_set_serial_data(serial, priv); 2134 2135 cp210x_determine_type(serial); 2136 cp210x_init_max_speed(serial); 2137 2138 result = cp210x_gpio_init(serial); 2139 if (result < 0) { 2140 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2141 result); 2142 } 2143 2144 return 0; 2145 } 2146 2147 static void cp210x_disconnect(struct usb_serial *serial) 2148 { 2149 cp210x_gpio_remove(serial); 2150 } 2151 2152 static void cp210x_release(struct usb_serial *serial) 2153 { 2154 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2155 2156 cp210x_gpio_remove(serial); 2157 2158 kfree(priv); 2159 } 2160 2161 module_usb_serial_driver(serial_drivers, id_table); 2162 2163 MODULE_DESCRIPTION(DRIVER_DESC); 2164 MODULE_LICENSE("GPL v2"); 2165