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(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */ 73 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 74 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 75 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 76 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 77 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 78 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 79 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 80 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 81 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 82 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 83 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 84 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 85 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 86 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 87 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 88 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 89 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 90 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 91 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 92 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 93 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 94 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 95 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 96 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 97 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 98 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 99 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 100 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 101 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 102 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 104 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 105 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 106 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 107 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 108 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 109 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 110 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 111 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 112 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 113 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 114 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 115 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 116 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 117 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 118 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 119 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 120 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 121 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 122 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 123 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 124 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 125 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 126 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 127 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 128 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 129 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 130 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 131 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 132 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 133 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 134 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 135 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 136 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 137 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 138 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 139 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 140 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 141 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 142 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 143 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 144 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 145 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 146 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 147 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 148 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 149 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 150 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 151 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 152 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 153 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 154 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 155 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 156 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 157 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 158 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 159 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 160 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 161 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 162 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 163 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 164 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 165 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 166 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 167 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 168 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 169 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 170 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 171 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 172 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 173 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 174 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 175 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 176 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 177 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 178 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 179 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 180 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 181 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 182 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 183 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 184 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 185 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 186 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 187 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 188 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 189 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 190 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 191 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 192 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 193 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 194 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 195 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 196 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 197 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 198 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 199 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 200 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 201 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 202 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 203 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 204 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 205 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 206 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 207 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 208 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 209 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 210 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 211 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 212 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 213 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 214 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 215 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 216 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 217 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 218 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 219 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 220 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 221 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 222 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 223 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 224 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 225 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 226 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 227 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 228 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 230 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 231 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 232 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 233 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 234 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 235 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 236 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 237 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 238 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 239 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 240 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 241 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 242 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 243 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 244 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 245 { } /* Terminating Entry */ 246 }; 247 248 MODULE_DEVICE_TABLE(usb, id_table); 249 250 struct cp210x_serial_private { 251 #ifdef CONFIG_GPIOLIB 252 struct gpio_chip gc; 253 bool gpio_registered; 254 u16 gpio_pushpull; 255 u16 gpio_altfunc; 256 u16 gpio_input; 257 #endif 258 u8 partnum; 259 u32 fw_version; 260 speed_t min_speed; 261 speed_t max_speed; 262 bool use_actual_rate; 263 bool no_flow_control; 264 bool no_event_mode; 265 }; 266 267 enum cp210x_event_state { 268 ES_DATA, 269 ES_ESCAPE, 270 ES_LSR, 271 ES_LSR_DATA_0, 272 ES_LSR_DATA_1, 273 ES_MSR 274 }; 275 276 struct cp210x_port_private { 277 u8 bInterfaceNumber; 278 bool event_mode; 279 enum cp210x_event_state event_state; 280 u8 lsr; 281 282 struct mutex mutex; 283 bool crtscts; 284 bool dtr; 285 bool rts; 286 }; 287 288 static struct usb_serial_driver cp210x_device = { 289 .driver = { 290 .owner = THIS_MODULE, 291 .name = "cp210x", 292 }, 293 .id_table = id_table, 294 .num_ports = 1, 295 .bulk_in_size = 256, 296 .bulk_out_size = 256, 297 .open = cp210x_open, 298 .close = cp210x_close, 299 .break_ctl = cp210x_break_ctl, 300 .set_termios = cp210x_set_termios, 301 .tx_empty = cp210x_tx_empty, 302 .throttle = usb_serial_generic_throttle, 303 .unthrottle = usb_serial_generic_unthrottle, 304 .tiocmget = cp210x_tiocmget, 305 .tiocmset = cp210x_tiocmset, 306 .get_icount = usb_serial_generic_get_icount, 307 .attach = cp210x_attach, 308 .disconnect = cp210x_disconnect, 309 .release = cp210x_release, 310 .port_probe = cp210x_port_probe, 311 .port_remove = cp210x_port_remove, 312 .dtr_rts = cp210x_dtr_rts, 313 .process_read_urb = cp210x_process_read_urb, 314 }; 315 316 static struct usb_serial_driver * const serial_drivers[] = { 317 &cp210x_device, NULL 318 }; 319 320 /* Config request types */ 321 #define REQTYPE_HOST_TO_INTERFACE 0x41 322 #define REQTYPE_INTERFACE_TO_HOST 0xc1 323 #define REQTYPE_HOST_TO_DEVICE 0x40 324 #define REQTYPE_DEVICE_TO_HOST 0xc0 325 326 /* Config request codes */ 327 #define CP210X_IFC_ENABLE 0x00 328 #define CP210X_SET_BAUDDIV 0x01 329 #define CP210X_GET_BAUDDIV 0x02 330 #define CP210X_SET_LINE_CTL 0x03 331 #define CP210X_GET_LINE_CTL 0x04 332 #define CP210X_SET_BREAK 0x05 333 #define CP210X_IMM_CHAR 0x06 334 #define CP210X_SET_MHS 0x07 335 #define CP210X_GET_MDMSTS 0x08 336 #define CP210X_SET_XON 0x09 337 #define CP210X_SET_XOFF 0x0A 338 #define CP210X_SET_EVENTMASK 0x0B 339 #define CP210X_GET_EVENTMASK 0x0C 340 #define CP210X_SET_CHAR 0x0D 341 #define CP210X_GET_CHARS 0x0E 342 #define CP210X_GET_PROPS 0x0F 343 #define CP210X_GET_COMM_STATUS 0x10 344 #define CP210X_RESET 0x11 345 #define CP210X_PURGE 0x12 346 #define CP210X_SET_FLOW 0x13 347 #define CP210X_GET_FLOW 0x14 348 #define CP210X_EMBED_EVENTS 0x15 349 #define CP210X_GET_EVENTSTATE 0x16 350 #define CP210X_SET_CHARS 0x19 351 #define CP210X_GET_BAUDRATE 0x1D 352 #define CP210X_SET_BAUDRATE 0x1E 353 #define CP210X_VENDOR_SPECIFIC 0xFF 354 355 /* CP210X_IFC_ENABLE */ 356 #define UART_ENABLE 0x0001 357 #define UART_DISABLE 0x0000 358 359 /* CP210X_(SET|GET)_BAUDDIV */ 360 #define BAUD_RATE_GEN_FREQ 0x384000 361 362 /* CP210X_(SET|GET)_LINE_CTL */ 363 #define BITS_DATA_MASK 0X0f00 364 #define BITS_DATA_5 0X0500 365 #define BITS_DATA_6 0X0600 366 #define BITS_DATA_7 0X0700 367 #define BITS_DATA_8 0X0800 368 #define BITS_DATA_9 0X0900 369 370 #define BITS_PARITY_MASK 0x00f0 371 #define BITS_PARITY_NONE 0x0000 372 #define BITS_PARITY_ODD 0x0010 373 #define BITS_PARITY_EVEN 0x0020 374 #define BITS_PARITY_MARK 0x0030 375 #define BITS_PARITY_SPACE 0x0040 376 377 #define BITS_STOP_MASK 0x000f 378 #define BITS_STOP_1 0x0000 379 #define BITS_STOP_1_5 0x0001 380 #define BITS_STOP_2 0x0002 381 382 /* CP210X_SET_BREAK */ 383 #define BREAK_ON 0x0001 384 #define BREAK_OFF 0x0000 385 386 /* CP210X_(SET_MHS|GET_MDMSTS) */ 387 #define CONTROL_DTR 0x0001 388 #define CONTROL_RTS 0x0002 389 #define CONTROL_CTS 0x0010 390 #define CONTROL_DSR 0x0020 391 #define CONTROL_RING 0x0040 392 #define CONTROL_DCD 0x0080 393 #define CONTROL_WRITE_DTR 0x0100 394 #define CONTROL_WRITE_RTS 0x0200 395 396 /* CP210X_(GET|SET)_CHARS */ 397 struct cp210x_special_chars { 398 u8 bEofChar; 399 u8 bErrorChar; 400 u8 bBreakChar; 401 u8 bEventChar; 402 u8 bXonChar; 403 u8 bXoffChar; 404 }; 405 406 /* CP210X_VENDOR_SPECIFIC values */ 407 #define CP210X_GET_FW_VER 0x000E 408 #define CP210X_READ_2NCONFIG 0x000E 409 #define CP210X_GET_FW_VER_2N 0x0010 410 #define CP210X_READ_LATCH 0x00C2 411 #define CP210X_GET_PARTNUM 0x370B 412 #define CP210X_GET_PORTCONFIG 0x370C 413 #define CP210X_GET_DEVICEMODE 0x3711 414 #define CP210X_WRITE_LATCH 0x37E1 415 416 /* Part number definitions */ 417 #define CP210X_PARTNUM_CP2101 0x01 418 #define CP210X_PARTNUM_CP2102 0x02 419 #define CP210X_PARTNUM_CP2103 0x03 420 #define CP210X_PARTNUM_CP2104 0x04 421 #define CP210X_PARTNUM_CP2105 0x05 422 #define CP210X_PARTNUM_CP2108 0x08 423 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 424 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 425 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 426 #define CP210X_PARTNUM_UNKNOWN 0xFF 427 428 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 429 struct cp210x_comm_status { 430 __le32 ulErrors; 431 __le32 ulHoldReasons; 432 __le32 ulAmountInInQueue; 433 __le32 ulAmountInOutQueue; 434 u8 bEofReceived; 435 u8 bWaitForImmediate; 436 u8 bReserved; 437 } __packed; 438 439 /* 440 * CP210X_PURGE - 16 bits passed in wValue of USB request. 441 * SiLabs app note AN571 gives a strange description of the 4 bits: 442 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 443 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 444 */ 445 #define PURGE_ALL 0x000f 446 447 /* CP210X_EMBED_EVENTS */ 448 #define CP210X_ESCCHAR 0xec 449 450 #define CP210X_LSR_OVERRUN BIT(1) 451 #define CP210X_LSR_PARITY BIT(2) 452 #define CP210X_LSR_FRAME BIT(3) 453 #define CP210X_LSR_BREAK BIT(4) 454 455 456 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 457 struct cp210x_flow_ctl { 458 __le32 ulControlHandshake; 459 __le32 ulFlowReplace; 460 __le32 ulXonLimit; 461 __le32 ulXoffLimit; 462 }; 463 464 /* cp210x_flow_ctl::ulControlHandshake */ 465 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 466 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 467 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 468 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 469 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 470 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 471 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 472 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 473 474 /* cp210x_flow_ctl::ulFlowReplace */ 475 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 476 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 477 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 478 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 479 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 480 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 481 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 482 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 483 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 484 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 485 486 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 487 struct cp210x_pin_mode { 488 u8 eci; 489 u8 sci; 490 }; 491 492 #define CP210X_PIN_MODE_MODEM 0 493 #define CP210X_PIN_MODE_GPIO BIT(0) 494 495 /* 496 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 497 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 498 */ 499 struct cp210x_dual_port_config { 500 __le16 gpio_mode; 501 u8 __pad0[2]; 502 __le16 reset_state; 503 u8 __pad1[4]; 504 __le16 suspend_state; 505 u8 sci_cfg; 506 u8 eci_cfg; 507 u8 device_cfg; 508 } __packed; 509 510 /* 511 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 512 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 513 */ 514 struct cp210x_single_port_config { 515 __le16 gpio_mode; 516 u8 __pad0[2]; 517 __le16 reset_state; 518 u8 __pad1[4]; 519 __le16 suspend_state; 520 u8 device_cfg; 521 } __packed; 522 523 /* GPIO modes */ 524 #define CP210X_SCI_GPIO_MODE_OFFSET 9 525 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 526 527 #define CP210X_ECI_GPIO_MODE_OFFSET 2 528 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 529 530 #define CP210X_GPIO_MODE_OFFSET 8 531 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 532 533 /* CP2105 port configuration values */ 534 #define CP2105_GPIO0_TXLED_MODE BIT(0) 535 #define CP2105_GPIO1_RXLED_MODE BIT(1) 536 #define CP2105_GPIO1_RS485_MODE BIT(2) 537 538 /* CP2104 port configuration values */ 539 #define CP2104_GPIO0_TXLED_MODE BIT(0) 540 #define CP2104_GPIO1_RXLED_MODE BIT(1) 541 #define CP2104_GPIO2_RS485_MODE BIT(2) 542 543 struct cp210x_quad_port_state { 544 __le16 gpio_mode_pb0; 545 __le16 gpio_mode_pb1; 546 __le16 gpio_mode_pb2; 547 __le16 gpio_mode_pb3; 548 __le16 gpio_mode_pb4; 549 550 __le16 gpio_lowpower_pb0; 551 __le16 gpio_lowpower_pb1; 552 __le16 gpio_lowpower_pb2; 553 __le16 gpio_lowpower_pb3; 554 __le16 gpio_lowpower_pb4; 555 556 __le16 gpio_latch_pb0; 557 __le16 gpio_latch_pb1; 558 __le16 gpio_latch_pb2; 559 __le16 gpio_latch_pb3; 560 __le16 gpio_latch_pb4; 561 }; 562 563 /* 564 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 565 * on a CP2108 chip. 566 * 567 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 568 */ 569 struct cp210x_quad_port_config { 570 struct cp210x_quad_port_state reset_state; 571 struct cp210x_quad_port_state suspend_state; 572 u8 ipdelay_ifc[4]; 573 u8 enhancedfxn_ifc[4]; 574 u8 enhancedfxn_device; 575 u8 extclkfreq[4]; 576 } __packed; 577 578 #define CP2108_EF_IFC_GPIO_TXLED 0x01 579 #define CP2108_EF_IFC_GPIO_RXLED 0x02 580 #define CP2108_EF_IFC_GPIO_RS485 0x04 581 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 582 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 583 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 584 585 /* CP2102N configuration array indices */ 586 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 587 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 588 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 589 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 590 591 /* CP2102N QFN20 port configuration values */ 592 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 593 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 594 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 595 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 596 597 /* 598 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 599 * for CP2102N, CP2103, CP2104 and CP2105. 600 */ 601 struct cp210x_gpio_write { 602 u8 mask; 603 u8 state; 604 }; 605 606 /* 607 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 608 * for CP2108. 609 */ 610 struct cp210x_gpio_write16 { 611 __le16 mask; 612 __le16 state; 613 }; 614 615 /* 616 * Helper to get interface number when we only have struct usb_serial. 617 */ 618 static u8 cp210x_interface_num(struct usb_serial *serial) 619 { 620 struct usb_host_interface *cur_altsetting; 621 622 cur_altsetting = serial->interface->cur_altsetting; 623 624 return cur_altsetting->desc.bInterfaceNumber; 625 } 626 627 /* 628 * Reads a variable-sized block of CP210X_ registers, identified by req. 629 * Returns data into buf in native USB byte order. 630 */ 631 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 632 void *buf, int bufsize) 633 { 634 struct usb_serial *serial = port->serial; 635 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 636 int result; 637 638 639 result = usb_control_msg_recv(serial->dev, 0, req, 640 REQTYPE_INTERFACE_TO_HOST, 0, 641 port_priv->bInterfaceNumber, buf, bufsize, 642 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 643 if (result) { 644 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 645 req, bufsize, result); 646 return result; 647 } 648 649 return 0; 650 } 651 652 /* 653 * Reads any 8-bit CP210X_ register identified by req. 654 */ 655 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 656 { 657 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 658 } 659 660 /* 661 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 662 * Returns data into buf in native USB byte order. 663 */ 664 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 665 void *buf, int bufsize) 666 { 667 int result; 668 669 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 670 type, val, cp210x_interface_num(serial), buf, bufsize, 671 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 672 if (result) { 673 dev_err(&serial->interface->dev, 674 "failed to get vendor val 0x%04x size %d: %d\n", val, 675 bufsize, result); 676 return result; 677 } 678 679 return 0; 680 } 681 682 /* 683 * Writes any 16-bit CP210X_ register (req) whose value is passed 684 * entirely in the wValue field of the USB request. 685 */ 686 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 687 { 688 struct usb_serial *serial = port->serial; 689 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 690 int result; 691 692 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 693 req, REQTYPE_HOST_TO_INTERFACE, val, 694 port_priv->bInterfaceNumber, NULL, 0, 695 USB_CTRL_SET_TIMEOUT); 696 if (result < 0) { 697 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 698 req, result); 699 } 700 701 return result; 702 } 703 704 /* 705 * Writes a variable-sized block of CP210X_ registers, identified by req. 706 * Data in buf must be in native USB byte order. 707 */ 708 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 709 void *buf, int bufsize) 710 { 711 struct usb_serial *serial = port->serial; 712 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 713 int result; 714 715 result = usb_control_msg_send(serial->dev, 0, req, 716 REQTYPE_HOST_TO_INTERFACE, 0, 717 port_priv->bInterfaceNumber, buf, bufsize, 718 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 719 if (result) { 720 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 721 req, bufsize, result); 722 return result; 723 } 724 725 return 0; 726 } 727 728 /* 729 * Writes any 32-bit CP210X_ register identified by req. 730 */ 731 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 732 { 733 __le32 le32_val; 734 735 le32_val = cpu_to_le32(val); 736 737 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 738 } 739 740 #ifdef CONFIG_GPIOLIB 741 /* 742 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 743 * Data in buf must be in native USB byte order. 744 */ 745 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 746 u16 val, void *buf, int bufsize) 747 { 748 int result; 749 750 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 751 type, val, cp210x_interface_num(serial), buf, bufsize, 752 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 753 if (result) { 754 dev_err(&serial->interface->dev, 755 "failed to set vendor val 0x%04x size %d: %d\n", val, 756 bufsize, result); 757 return result; 758 } 759 760 return 0; 761 } 762 #endif 763 764 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 765 { 766 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 767 int result; 768 769 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 770 if (result) { 771 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 772 return result; 773 } 774 775 if (tty) 776 cp210x_set_termios(tty, port, NULL); 777 778 result = usb_serial_generic_open(tty, port); 779 if (result) 780 goto err_disable; 781 782 return 0; 783 784 err_disable: 785 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 786 port_priv->event_mode = false; 787 788 return result; 789 } 790 791 static void cp210x_close(struct usb_serial_port *port) 792 { 793 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 794 795 usb_serial_generic_close(port); 796 797 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 798 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 799 800 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 801 802 /* Disabling the interface disables event-insertion mode. */ 803 port_priv->event_mode = false; 804 } 805 806 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 807 { 808 if (lsr & CP210X_LSR_BREAK) { 809 port->icount.brk++; 810 *flag = TTY_BREAK; 811 } else if (lsr & CP210X_LSR_PARITY) { 812 port->icount.parity++; 813 *flag = TTY_PARITY; 814 } else if (lsr & CP210X_LSR_FRAME) { 815 port->icount.frame++; 816 *flag = TTY_FRAME; 817 } 818 819 if (lsr & CP210X_LSR_OVERRUN) { 820 port->icount.overrun++; 821 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 822 } 823 } 824 825 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 826 { 827 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 828 829 switch (port_priv->event_state) { 830 case ES_DATA: 831 if (*ch == CP210X_ESCCHAR) { 832 port_priv->event_state = ES_ESCAPE; 833 break; 834 } 835 return false; 836 case ES_ESCAPE: 837 switch (*ch) { 838 case 0: 839 dev_dbg(&port->dev, "%s - escape char\n", __func__); 840 *ch = CP210X_ESCCHAR; 841 port_priv->event_state = ES_DATA; 842 return false; 843 case 1: 844 port_priv->event_state = ES_LSR_DATA_0; 845 break; 846 case 2: 847 port_priv->event_state = ES_LSR; 848 break; 849 case 3: 850 port_priv->event_state = ES_MSR; 851 break; 852 default: 853 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 854 port_priv->event_state = ES_DATA; 855 break; 856 } 857 break; 858 case ES_LSR_DATA_0: 859 port_priv->lsr = *ch; 860 port_priv->event_state = ES_LSR_DATA_1; 861 break; 862 case ES_LSR_DATA_1: 863 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 864 __func__, port_priv->lsr, *ch); 865 cp210x_process_lsr(port, port_priv->lsr, flag); 866 port_priv->event_state = ES_DATA; 867 return false; 868 case ES_LSR: 869 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 870 port_priv->lsr = *ch; 871 cp210x_process_lsr(port, port_priv->lsr, flag); 872 port_priv->event_state = ES_DATA; 873 break; 874 case ES_MSR: 875 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 876 /* unimplemented */ 877 port_priv->event_state = ES_DATA; 878 break; 879 } 880 881 return true; 882 } 883 884 static void cp210x_process_read_urb(struct urb *urb) 885 { 886 struct usb_serial_port *port = urb->context; 887 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 888 unsigned char *ch = urb->transfer_buffer; 889 char flag; 890 int i; 891 892 if (!urb->actual_length) 893 return; 894 895 if (port_priv->event_mode) { 896 for (i = 0; i < urb->actual_length; i++, ch++) { 897 flag = TTY_NORMAL; 898 899 if (cp210x_process_char(port, ch, &flag)) 900 continue; 901 902 tty_insert_flip_char(&port->port, *ch, flag); 903 } 904 } else { 905 tty_insert_flip_string(&port->port, ch, urb->actual_length); 906 } 907 tty_flip_buffer_push(&port->port); 908 } 909 910 /* 911 * Read how many bytes are waiting in the TX queue. 912 */ 913 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 914 u32 *count) 915 { 916 struct usb_serial *serial = port->serial; 917 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 918 struct cp210x_comm_status sts; 919 int result; 920 921 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 922 REQTYPE_INTERFACE_TO_HOST, 0, 923 port_priv->bInterfaceNumber, &sts, sizeof(sts), 924 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 925 if (result) { 926 dev_err(&port->dev, "failed to get comm status: %d\n", result); 927 return result; 928 } 929 930 *count = le32_to_cpu(sts.ulAmountInOutQueue); 931 932 return 0; 933 } 934 935 static bool cp210x_tx_empty(struct usb_serial_port *port) 936 { 937 int err; 938 u32 count; 939 940 err = cp210x_get_tx_queue_byte_count(port, &count); 941 if (err) 942 return true; 943 944 return !count; 945 } 946 947 struct cp210x_rate { 948 speed_t rate; 949 speed_t high; 950 }; 951 952 static const struct cp210x_rate cp210x_an205_table1[] = { 953 { 300, 300 }, 954 { 600, 600 }, 955 { 1200, 1200 }, 956 { 1800, 1800 }, 957 { 2400, 2400 }, 958 { 4000, 4000 }, 959 { 4800, 4803 }, 960 { 7200, 7207 }, 961 { 9600, 9612 }, 962 { 14400, 14428 }, 963 { 16000, 16062 }, 964 { 19200, 19250 }, 965 { 28800, 28912 }, 966 { 38400, 38601 }, 967 { 51200, 51558 }, 968 { 56000, 56280 }, 969 { 57600, 58053 }, 970 { 64000, 64111 }, 971 { 76800, 77608 }, 972 { 115200, 117028 }, 973 { 128000, 129347 }, 974 { 153600, 156868 }, 975 { 230400, 237832 }, 976 { 250000, 254234 }, 977 { 256000, 273066 }, 978 { 460800, 491520 }, 979 { 500000, 567138 }, 980 { 576000, 670254 }, 981 { 921600, UINT_MAX } 982 }; 983 984 /* 985 * Quantises the baud rate as per AN205 Table 1 986 */ 987 static speed_t cp210x_get_an205_rate(speed_t baud) 988 { 989 int i; 990 991 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 992 if (baud <= cp210x_an205_table1[i].high) 993 break; 994 } 995 996 return cp210x_an205_table1[i].rate; 997 } 998 999 static speed_t cp210x_get_actual_rate(speed_t baud) 1000 { 1001 unsigned int prescale = 1; 1002 unsigned int div; 1003 1004 if (baud <= 365) 1005 prescale = 4; 1006 1007 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1008 baud = 48000000 / (2 * prescale * div); 1009 1010 return baud; 1011 } 1012 1013 /* 1014 * CP2101 supports the following baud rates: 1015 * 1016 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1017 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1018 * 1019 * CP2102 and CP2103 support the following additional rates: 1020 * 1021 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1022 * 576000 1023 * 1024 * The device will map a requested rate to a supported one, but the result 1025 * of requests for rates greater than 1053257 is undefined (see AN205). 1026 * 1027 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1028 * respectively, with an error less than 1%. The actual rates are determined 1029 * by 1030 * 1031 * div = round(freq / (2 x prescale x request)) 1032 * actual = freq / (2 x prescale x div) 1033 * 1034 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1035 * or 1 otherwise. 1036 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1037 * otherwise. 1038 */ 1039 static void cp210x_change_speed(struct tty_struct *tty, 1040 struct usb_serial_port *port, struct ktermios *old_termios) 1041 { 1042 struct usb_serial *serial = port->serial; 1043 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1044 u32 baud; 1045 1046 /* 1047 * This maps the requested rate to the actual rate, a valid rate on 1048 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1049 * 1050 * NOTE: B0 is not implemented. 1051 */ 1052 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1053 1054 if (priv->use_actual_rate) 1055 baud = cp210x_get_actual_rate(baud); 1056 else if (baud < 1000000) 1057 baud = cp210x_get_an205_rate(baud); 1058 1059 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1060 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1061 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1062 if (old_termios) 1063 baud = old_termios->c_ospeed; 1064 else 1065 baud = 9600; 1066 } 1067 1068 tty_encode_baud_rate(tty, baud, baud); 1069 } 1070 1071 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1072 { 1073 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1074 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1075 int ret; 1076 1077 if (port_priv->event_mode) 1078 return; 1079 1080 if (priv->no_event_mode) 1081 return; 1082 1083 port_priv->event_state = ES_DATA; 1084 port_priv->event_mode = true; 1085 1086 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1087 if (ret) { 1088 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1089 port_priv->event_mode = false; 1090 } 1091 } 1092 1093 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1094 { 1095 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1096 int ret; 1097 1098 if (!port_priv->event_mode) 1099 return; 1100 1101 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1102 if (ret) { 1103 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1104 return; 1105 } 1106 1107 port_priv->event_mode = false; 1108 } 1109 1110 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1111 { 1112 bool iflag_change, cc_change; 1113 1114 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1115 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1116 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1117 1118 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1119 } 1120 1121 static void cp210x_set_flow_control(struct tty_struct *tty, 1122 struct usb_serial_port *port, struct ktermios *old_termios) 1123 { 1124 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1125 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1126 struct cp210x_special_chars chars; 1127 struct cp210x_flow_ctl flow_ctl; 1128 u32 flow_repl; 1129 u32 ctl_hs; 1130 bool crtscts; 1131 int ret; 1132 1133 /* 1134 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1135 * CP2102N_E104). Report back that flow control is not supported. 1136 */ 1137 if (priv->no_flow_control) { 1138 tty->termios.c_cflag &= ~CRTSCTS; 1139 tty->termios.c_iflag &= ~(IXON | IXOFF); 1140 } 1141 1142 if (old_termios && 1143 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1144 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1145 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1146 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1147 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1148 return; 1149 } 1150 1151 if (I_IXON(tty) || I_IXOFF(tty)) { 1152 memset(&chars, 0, sizeof(chars)); 1153 1154 chars.bXonChar = START_CHAR(tty); 1155 chars.bXoffChar = STOP_CHAR(tty); 1156 1157 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1158 sizeof(chars)); 1159 if (ret) { 1160 dev_err(&port->dev, "failed to set special chars: %d\n", 1161 ret); 1162 } 1163 } 1164 1165 mutex_lock(&port_priv->mutex); 1166 1167 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1168 sizeof(flow_ctl)); 1169 if (ret) 1170 goto out_unlock; 1171 1172 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1173 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1174 1175 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1176 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1177 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1178 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1179 if (port_priv->dtr) 1180 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1181 else 1182 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1183 1184 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1185 if (C_CRTSCTS(tty)) { 1186 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1187 if (port_priv->rts) 1188 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1189 else 1190 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1191 crtscts = true; 1192 } else { 1193 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1194 if (port_priv->rts) 1195 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1196 else 1197 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1198 crtscts = false; 1199 } 1200 1201 if (I_IXOFF(tty)) { 1202 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1203 1204 flow_ctl.ulXonLimit = cpu_to_le32(128); 1205 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1206 } else { 1207 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1208 } 1209 1210 if (I_IXON(tty)) 1211 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1212 else 1213 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1214 1215 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1216 ctl_hs, flow_repl); 1217 1218 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1219 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1220 1221 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1222 sizeof(flow_ctl)); 1223 if (ret) 1224 goto out_unlock; 1225 1226 port_priv->crtscts = crtscts; 1227 out_unlock: 1228 mutex_unlock(&port_priv->mutex); 1229 } 1230 1231 static void cp210x_set_termios(struct tty_struct *tty, 1232 struct usb_serial_port *port, struct ktermios *old_termios) 1233 { 1234 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1235 u16 bits; 1236 int ret; 1237 1238 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1239 return; 1240 1241 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1242 cp210x_change_speed(tty, port, old_termios); 1243 1244 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1245 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1246 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1247 tty->termios.c_cflag |= CS8; 1248 } 1249 1250 bits = 0; 1251 1252 switch (C_CSIZE(tty)) { 1253 case CS5: 1254 bits |= BITS_DATA_5; 1255 break; 1256 case CS6: 1257 bits |= BITS_DATA_6; 1258 break; 1259 case CS7: 1260 bits |= BITS_DATA_7; 1261 break; 1262 case CS8: 1263 default: 1264 bits |= BITS_DATA_8; 1265 break; 1266 } 1267 1268 if (C_PARENB(tty)) { 1269 if (C_CMSPAR(tty)) { 1270 if (C_PARODD(tty)) 1271 bits |= BITS_PARITY_MARK; 1272 else 1273 bits |= BITS_PARITY_SPACE; 1274 } else { 1275 if (C_PARODD(tty)) 1276 bits |= BITS_PARITY_ODD; 1277 else 1278 bits |= BITS_PARITY_EVEN; 1279 } 1280 } 1281 1282 if (C_CSTOPB(tty)) 1283 bits |= BITS_STOP_2; 1284 else 1285 bits |= BITS_STOP_1; 1286 1287 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1288 if (ret) 1289 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1290 1291 cp210x_set_flow_control(tty, port, old_termios); 1292 1293 /* 1294 * Enable event-insertion mode only if input parity checking is 1295 * enabled for now. 1296 */ 1297 if (I_INPCK(tty)) 1298 cp210x_enable_event_mode(port); 1299 else 1300 cp210x_disable_event_mode(port); 1301 } 1302 1303 static int cp210x_tiocmset(struct tty_struct *tty, 1304 unsigned int set, unsigned int clear) 1305 { 1306 struct usb_serial_port *port = tty->driver_data; 1307 return cp210x_tiocmset_port(port, set, clear); 1308 } 1309 1310 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1311 unsigned int set, unsigned int clear) 1312 { 1313 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1314 struct cp210x_flow_ctl flow_ctl; 1315 u32 ctl_hs, flow_repl; 1316 u16 control = 0; 1317 int ret; 1318 1319 mutex_lock(&port_priv->mutex); 1320 1321 if (set & TIOCM_RTS) { 1322 port_priv->rts = true; 1323 control |= CONTROL_RTS; 1324 control |= CONTROL_WRITE_RTS; 1325 } 1326 if (set & TIOCM_DTR) { 1327 port_priv->dtr = true; 1328 control |= CONTROL_DTR; 1329 control |= CONTROL_WRITE_DTR; 1330 } 1331 if (clear & TIOCM_RTS) { 1332 port_priv->rts = false; 1333 control &= ~CONTROL_RTS; 1334 control |= CONTROL_WRITE_RTS; 1335 } 1336 if (clear & TIOCM_DTR) { 1337 port_priv->dtr = false; 1338 control &= ~CONTROL_DTR; 1339 control |= CONTROL_WRITE_DTR; 1340 } 1341 1342 /* 1343 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1344 * flow control is enabled. 1345 */ 1346 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1347 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1348 sizeof(flow_ctl)); 1349 if (ret) 1350 goto out_unlock; 1351 1352 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1353 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1354 1355 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1356 if (port_priv->dtr) 1357 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1358 else 1359 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1360 1361 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1362 if (port_priv->rts) 1363 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1364 else 1365 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1366 1367 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1368 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1369 1370 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1371 __func__, ctl_hs, flow_repl); 1372 1373 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1374 sizeof(flow_ctl)); 1375 } else { 1376 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1377 1378 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1379 } 1380 out_unlock: 1381 mutex_unlock(&port_priv->mutex); 1382 1383 return ret; 1384 } 1385 1386 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1387 { 1388 if (on) 1389 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1390 else 1391 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1392 } 1393 1394 static int cp210x_tiocmget(struct tty_struct *tty) 1395 { 1396 struct usb_serial_port *port = tty->driver_data; 1397 u8 control; 1398 int result; 1399 1400 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1401 if (result) 1402 return result; 1403 1404 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1405 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1406 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1407 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1408 |((control & CONTROL_RING)? TIOCM_RI : 0) 1409 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1410 1411 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1412 1413 return result; 1414 } 1415 1416 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1417 { 1418 struct usb_serial_port *port = tty->driver_data; 1419 u16 state; 1420 1421 if (break_state == 0) 1422 state = BREAK_OFF; 1423 else 1424 state = BREAK_ON; 1425 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1426 state == BREAK_OFF ? "off" : "on"); 1427 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1428 } 1429 1430 #ifdef CONFIG_GPIOLIB 1431 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1432 { 1433 struct usb_serial *serial = gpiochip_get_data(gc); 1434 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1435 u8 req_type; 1436 u16 mask; 1437 int result; 1438 int len; 1439 1440 result = usb_autopm_get_interface(serial->interface); 1441 if (result) 1442 return result; 1443 1444 switch (priv->partnum) { 1445 case CP210X_PARTNUM_CP2105: 1446 req_type = REQTYPE_INTERFACE_TO_HOST; 1447 len = 1; 1448 break; 1449 case CP210X_PARTNUM_CP2108: 1450 req_type = REQTYPE_INTERFACE_TO_HOST; 1451 len = 2; 1452 break; 1453 default: 1454 req_type = REQTYPE_DEVICE_TO_HOST; 1455 len = 1; 1456 break; 1457 } 1458 1459 mask = 0; 1460 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1461 &mask, len); 1462 1463 usb_autopm_put_interface(serial->interface); 1464 1465 if (result < 0) 1466 return result; 1467 1468 le16_to_cpus(&mask); 1469 1470 return !!(mask & BIT(gpio)); 1471 } 1472 1473 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1474 { 1475 struct usb_serial *serial = gpiochip_get_data(gc); 1476 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1477 struct cp210x_gpio_write16 buf16; 1478 struct cp210x_gpio_write buf; 1479 u16 mask, state; 1480 u16 wIndex; 1481 int result; 1482 1483 if (value == 1) 1484 state = BIT(gpio); 1485 else 1486 state = 0; 1487 1488 mask = BIT(gpio); 1489 1490 result = usb_autopm_get_interface(serial->interface); 1491 if (result) 1492 goto out; 1493 1494 switch (priv->partnum) { 1495 case CP210X_PARTNUM_CP2105: 1496 buf.mask = (u8)mask; 1497 buf.state = (u8)state; 1498 result = cp210x_write_vendor_block(serial, 1499 REQTYPE_HOST_TO_INTERFACE, 1500 CP210X_WRITE_LATCH, &buf, 1501 sizeof(buf)); 1502 break; 1503 case CP210X_PARTNUM_CP2108: 1504 buf16.mask = cpu_to_le16(mask); 1505 buf16.state = cpu_to_le16(state); 1506 result = cp210x_write_vendor_block(serial, 1507 REQTYPE_HOST_TO_INTERFACE, 1508 CP210X_WRITE_LATCH, &buf16, 1509 sizeof(buf16)); 1510 break; 1511 default: 1512 wIndex = state << 8 | mask; 1513 result = usb_control_msg(serial->dev, 1514 usb_sndctrlpipe(serial->dev, 0), 1515 CP210X_VENDOR_SPECIFIC, 1516 REQTYPE_HOST_TO_DEVICE, 1517 CP210X_WRITE_LATCH, 1518 wIndex, 1519 NULL, 0, USB_CTRL_SET_TIMEOUT); 1520 break; 1521 } 1522 1523 usb_autopm_put_interface(serial->interface); 1524 out: 1525 if (result < 0) { 1526 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1527 result); 1528 } 1529 } 1530 1531 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1532 { 1533 struct usb_serial *serial = gpiochip_get_data(gc); 1534 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1535 1536 return priv->gpio_input & BIT(gpio); 1537 } 1538 1539 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1540 { 1541 struct usb_serial *serial = gpiochip_get_data(gc); 1542 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1543 1544 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1545 /* hardware does not support an input mode */ 1546 return -ENOTSUPP; 1547 } 1548 1549 /* push-pull pins cannot be changed to be inputs */ 1550 if (priv->gpio_pushpull & BIT(gpio)) 1551 return -EINVAL; 1552 1553 /* make sure to release pin if it is being driven low */ 1554 cp210x_gpio_set(gc, gpio, 1); 1555 1556 priv->gpio_input |= BIT(gpio); 1557 1558 return 0; 1559 } 1560 1561 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1562 int value) 1563 { 1564 struct usb_serial *serial = gpiochip_get_data(gc); 1565 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1566 1567 priv->gpio_input &= ~BIT(gpio); 1568 cp210x_gpio_set(gc, gpio, value); 1569 1570 return 0; 1571 } 1572 1573 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1574 unsigned long config) 1575 { 1576 struct usb_serial *serial = gpiochip_get_data(gc); 1577 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1578 enum pin_config_param param = pinconf_to_config_param(config); 1579 1580 /* Succeed only if in correct mode (this can't be set at runtime) */ 1581 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1582 (priv->gpio_pushpull & BIT(gpio))) 1583 return 0; 1584 1585 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1586 !(priv->gpio_pushpull & BIT(gpio))) 1587 return 0; 1588 1589 return -ENOTSUPP; 1590 } 1591 1592 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1593 unsigned long *valid_mask, unsigned int ngpios) 1594 { 1595 struct usb_serial *serial = gpiochip_get_data(gc); 1596 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1597 struct device *dev = &serial->interface->dev; 1598 unsigned long altfunc_mask = priv->gpio_altfunc; 1599 1600 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1601 1602 if (bitmap_empty(valid_mask, ngpios)) 1603 dev_dbg(dev, "no pin configured for GPIO\n"); 1604 else 1605 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1606 valid_mask); 1607 return 0; 1608 } 1609 1610 /* 1611 * This function is for configuring GPIO using shared pins, where other signals 1612 * are made unavailable by configuring the use of GPIO. This is believed to be 1613 * only applicable to the cp2105 at this point, the other devices supported by 1614 * this driver that provide GPIO do so in a way that does not impact other 1615 * signals and are thus expected to have very different initialisation. 1616 */ 1617 static int cp2105_gpioconf_init(struct usb_serial *serial) 1618 { 1619 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1620 struct cp210x_pin_mode mode; 1621 struct cp210x_dual_port_config config; 1622 u8 intf_num = cp210x_interface_num(serial); 1623 u8 iface_config; 1624 int result; 1625 1626 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1627 CP210X_GET_DEVICEMODE, &mode, 1628 sizeof(mode)); 1629 if (result < 0) 1630 return result; 1631 1632 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1633 CP210X_GET_PORTCONFIG, &config, 1634 sizeof(config)); 1635 if (result < 0) 1636 return result; 1637 1638 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1639 if (intf_num == 0) { 1640 priv->gc.ngpio = 2; 1641 1642 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1643 /* mark all GPIOs of this interface as reserved */ 1644 priv->gpio_altfunc = 0xff; 1645 return 0; 1646 } 1647 1648 iface_config = config.eci_cfg; 1649 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1650 CP210X_ECI_GPIO_MODE_MASK) >> 1651 CP210X_ECI_GPIO_MODE_OFFSET); 1652 } else if (intf_num == 1) { 1653 priv->gc.ngpio = 3; 1654 1655 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1656 /* mark all GPIOs of this interface as reserved */ 1657 priv->gpio_altfunc = 0xff; 1658 return 0; 1659 } 1660 1661 iface_config = config.sci_cfg; 1662 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1663 CP210X_SCI_GPIO_MODE_MASK) >> 1664 CP210X_SCI_GPIO_MODE_OFFSET); 1665 } else { 1666 return -ENODEV; 1667 } 1668 1669 /* mark all pins which are not in GPIO mode */ 1670 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1671 priv->gpio_altfunc |= BIT(0); 1672 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1673 CP2105_GPIO1_RS485_MODE)) 1674 priv->gpio_altfunc |= BIT(1); 1675 1676 /* driver implementation for CP2105 only supports outputs */ 1677 priv->gpio_input = 0; 1678 1679 return 0; 1680 } 1681 1682 static int cp2104_gpioconf_init(struct usb_serial *serial) 1683 { 1684 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1685 struct cp210x_single_port_config config; 1686 u8 iface_config; 1687 u8 gpio_latch; 1688 int result; 1689 u8 i; 1690 1691 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1692 CP210X_GET_PORTCONFIG, &config, 1693 sizeof(config)); 1694 if (result < 0) 1695 return result; 1696 1697 priv->gc.ngpio = 4; 1698 1699 iface_config = config.device_cfg; 1700 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1701 CP210X_GPIO_MODE_MASK) >> 1702 CP210X_GPIO_MODE_OFFSET); 1703 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1704 CP210X_GPIO_MODE_MASK) >> 1705 CP210X_GPIO_MODE_OFFSET); 1706 1707 /* mark all pins which are not in GPIO mode */ 1708 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1709 priv->gpio_altfunc |= BIT(0); 1710 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1711 priv->gpio_altfunc |= BIT(1); 1712 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1713 priv->gpio_altfunc |= BIT(2); 1714 1715 /* 1716 * Like CP2102N, CP2104 has also no strict input and output pin 1717 * modes. 1718 * Do the same input mode emulation as CP2102N. 1719 */ 1720 for (i = 0; i < priv->gc.ngpio; ++i) { 1721 /* 1722 * Set direction to "input" iff pin is open-drain and reset 1723 * value is 1. 1724 */ 1725 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1726 priv->gpio_input |= BIT(i); 1727 } 1728 1729 return 0; 1730 } 1731 1732 static int cp2108_gpio_init(struct usb_serial *serial) 1733 { 1734 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1735 struct cp210x_quad_port_config config; 1736 u16 gpio_latch; 1737 int result; 1738 u8 i; 1739 1740 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1741 CP210X_GET_PORTCONFIG, &config, 1742 sizeof(config)); 1743 if (result < 0) 1744 return result; 1745 1746 priv->gc.ngpio = 16; 1747 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1748 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1749 1750 /* 1751 * Mark all pins which are not in GPIO mode. 1752 * 1753 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1754 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1755 * 1756 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1757 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1758 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1759 */ 1760 for (i = 0; i < 4; i++) { 1761 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1762 priv->gpio_altfunc |= BIT(i * 4); 1763 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1764 priv->gpio_altfunc |= BIT((i * 4) + 1); 1765 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1766 priv->gpio_altfunc |= BIT((i * 4) + 2); 1767 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1768 priv->gpio_altfunc |= BIT((i * 4) + 3); 1769 } 1770 1771 /* 1772 * Like CP2102N, CP2108 has also no strict input and output pin 1773 * modes. Do the same input mode emulation as CP2102N. 1774 */ 1775 for (i = 0; i < priv->gc.ngpio; ++i) { 1776 /* 1777 * Set direction to "input" iff pin is open-drain and reset 1778 * value is 1. 1779 */ 1780 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1781 priv->gpio_input |= BIT(i); 1782 } 1783 1784 return 0; 1785 } 1786 1787 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1788 { 1789 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1790 const u16 config_size = 0x02a6; 1791 u8 gpio_rst_latch; 1792 u8 config_version; 1793 u8 gpio_pushpull; 1794 u8 *config_buf; 1795 u8 gpio_latch; 1796 u8 gpio_ctrl; 1797 int result; 1798 u8 i; 1799 1800 /* 1801 * Retrieve device configuration from the device. 1802 * The array received contains all customization settings done at the 1803 * factory/manufacturer. Format of the array is documented at the 1804 * time of writing at: 1805 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1806 */ 1807 config_buf = kmalloc(config_size, GFP_KERNEL); 1808 if (!config_buf) 1809 return -ENOMEM; 1810 1811 result = cp210x_read_vendor_block(serial, 1812 REQTYPE_DEVICE_TO_HOST, 1813 CP210X_READ_2NCONFIG, 1814 config_buf, 1815 config_size); 1816 if (result < 0) { 1817 kfree(config_buf); 1818 return result; 1819 } 1820 1821 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1822 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1823 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1824 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1825 1826 kfree(config_buf); 1827 1828 /* Make sure this is a config format we understand. */ 1829 if (config_version != 0x01) 1830 return -ENOTSUPP; 1831 1832 priv->gc.ngpio = 4; 1833 1834 /* 1835 * Get default pin states after reset. Needed so we can determine 1836 * the direction of an open-drain pin. 1837 */ 1838 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1839 1840 /* 0 indicates open-drain mode, 1 is push-pull */ 1841 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1842 1843 /* 0 indicates GPIO mode, 1 is alternate function */ 1844 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1845 /* QFN20 is special... */ 1846 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1847 priv->gpio_altfunc |= BIT(0); 1848 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1849 priv->gpio_altfunc |= BIT(1); 1850 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1851 priv->gpio_altfunc |= BIT(2); 1852 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1853 priv->gpio_altfunc |= BIT(3); 1854 } else { 1855 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1856 } 1857 1858 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1859 /* 1860 * For the QFN28 package, GPIO4-6 are controlled by 1861 * the low three bits of the mode/latch fields. 1862 * Contrary to the document linked above, the bits for 1863 * the SUSPEND pins are elsewhere. No alternate 1864 * function is available for these pins. 1865 */ 1866 priv->gc.ngpio = 7; 1867 gpio_latch |= (gpio_rst_latch & 7) << 4; 1868 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1869 } 1870 1871 /* 1872 * The CP2102N does not strictly has input and output pin modes, 1873 * it only knows open-drain and push-pull modes which is set at 1874 * factory. An open-drain pin can function both as an 1875 * input or an output. We emulate input mode for open-drain pins 1876 * by making sure they are not driven low, and we do not allow 1877 * push-pull pins to be set as an input. 1878 */ 1879 for (i = 0; i < priv->gc.ngpio; ++i) { 1880 /* 1881 * Set direction to "input" iff pin is open-drain and reset 1882 * value is 1. 1883 */ 1884 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1885 priv->gpio_input |= BIT(i); 1886 } 1887 1888 return 0; 1889 } 1890 1891 static int cp210x_gpio_init(struct usb_serial *serial) 1892 { 1893 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1894 int result; 1895 1896 switch (priv->partnum) { 1897 case CP210X_PARTNUM_CP2104: 1898 result = cp2104_gpioconf_init(serial); 1899 break; 1900 case CP210X_PARTNUM_CP2105: 1901 result = cp2105_gpioconf_init(serial); 1902 break; 1903 case CP210X_PARTNUM_CP2108: 1904 /* 1905 * The GPIOs are not tied to any specific port so only register 1906 * once for interface 0. 1907 */ 1908 if (cp210x_interface_num(serial) != 0) 1909 return 0; 1910 result = cp2108_gpio_init(serial); 1911 break; 1912 case CP210X_PARTNUM_CP2102N_QFN28: 1913 case CP210X_PARTNUM_CP2102N_QFN24: 1914 case CP210X_PARTNUM_CP2102N_QFN20: 1915 result = cp2102n_gpioconf_init(serial); 1916 break; 1917 default: 1918 return 0; 1919 } 1920 1921 if (result < 0) 1922 return result; 1923 1924 priv->gc.label = "cp210x"; 1925 priv->gc.get_direction = cp210x_gpio_direction_get; 1926 priv->gc.direction_input = cp210x_gpio_direction_input; 1927 priv->gc.direction_output = cp210x_gpio_direction_output; 1928 priv->gc.get = cp210x_gpio_get; 1929 priv->gc.set = cp210x_gpio_set; 1930 priv->gc.set_config = cp210x_gpio_set_config; 1931 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1932 priv->gc.owner = THIS_MODULE; 1933 priv->gc.parent = &serial->interface->dev; 1934 priv->gc.base = -1; 1935 priv->gc.can_sleep = true; 1936 1937 result = gpiochip_add_data(&priv->gc, serial); 1938 if (!result) 1939 priv->gpio_registered = true; 1940 1941 return result; 1942 } 1943 1944 static void cp210x_gpio_remove(struct usb_serial *serial) 1945 { 1946 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1947 1948 if (priv->gpio_registered) { 1949 gpiochip_remove(&priv->gc); 1950 priv->gpio_registered = false; 1951 } 1952 } 1953 1954 #else 1955 1956 static int cp210x_gpio_init(struct usb_serial *serial) 1957 { 1958 return 0; 1959 } 1960 1961 static void cp210x_gpio_remove(struct usb_serial *serial) 1962 { 1963 /* Nothing to do */ 1964 } 1965 1966 #endif 1967 1968 static int cp210x_port_probe(struct usb_serial_port *port) 1969 { 1970 struct usb_serial *serial = port->serial; 1971 struct cp210x_port_private *port_priv; 1972 1973 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1974 if (!port_priv) 1975 return -ENOMEM; 1976 1977 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1978 mutex_init(&port_priv->mutex); 1979 1980 usb_set_serial_port_data(port, port_priv); 1981 1982 return 0; 1983 } 1984 1985 static void cp210x_port_remove(struct usb_serial_port *port) 1986 { 1987 struct cp210x_port_private *port_priv; 1988 1989 port_priv = usb_get_serial_port_data(port); 1990 kfree(port_priv); 1991 } 1992 1993 static void cp210x_init_max_speed(struct usb_serial *serial) 1994 { 1995 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1996 bool use_actual_rate = false; 1997 speed_t min = 300; 1998 speed_t max; 1999 2000 switch (priv->partnum) { 2001 case CP210X_PARTNUM_CP2101: 2002 max = 921600; 2003 break; 2004 case CP210X_PARTNUM_CP2102: 2005 case CP210X_PARTNUM_CP2103: 2006 max = 1000000; 2007 break; 2008 case CP210X_PARTNUM_CP2104: 2009 use_actual_rate = true; 2010 max = 2000000; 2011 break; 2012 case CP210X_PARTNUM_CP2108: 2013 max = 2000000; 2014 break; 2015 case CP210X_PARTNUM_CP2105: 2016 if (cp210x_interface_num(serial) == 0) { 2017 use_actual_rate = true; 2018 max = 2000000; /* ECI */ 2019 } else { 2020 min = 2400; 2021 max = 921600; /* SCI */ 2022 } 2023 break; 2024 case CP210X_PARTNUM_CP2102N_QFN28: 2025 case CP210X_PARTNUM_CP2102N_QFN24: 2026 case CP210X_PARTNUM_CP2102N_QFN20: 2027 use_actual_rate = true; 2028 max = 3000000; 2029 break; 2030 default: 2031 max = 2000000; 2032 break; 2033 } 2034 2035 priv->min_speed = min; 2036 priv->max_speed = max; 2037 priv->use_actual_rate = use_actual_rate; 2038 } 2039 2040 static void cp2102_determine_quirks(struct usb_serial *serial) 2041 { 2042 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2043 u8 *buf; 2044 int ret; 2045 2046 buf = kmalloc(2, GFP_KERNEL); 2047 if (!buf) 2048 return; 2049 /* 2050 * Some (possibly counterfeit) CP2102 do not support event-insertion 2051 * mode and respond differently to malformed vendor requests. 2052 * Specifically, they return one instead of two bytes when sent a 2053 * two-byte part-number request. 2054 */ 2055 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2056 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2057 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2058 if (ret == 1) { 2059 dev_dbg(&serial->interface->dev, 2060 "device does not support event-insertion mode\n"); 2061 priv->no_event_mode = true; 2062 } 2063 2064 kfree(buf); 2065 } 2066 2067 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2068 { 2069 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2070 u8 ver[3]; 2071 int ret; 2072 2073 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2074 ver, sizeof(ver)); 2075 if (ret) 2076 return ret; 2077 2078 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2079 ver[0], ver[1], ver[2]); 2080 2081 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2082 2083 return 0; 2084 } 2085 2086 static void cp210x_determine_type(struct usb_serial *serial) 2087 { 2088 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2089 int ret; 2090 2091 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2092 CP210X_GET_PARTNUM, &priv->partnum, 2093 sizeof(priv->partnum)); 2094 if (ret < 0) { 2095 dev_warn(&serial->interface->dev, 2096 "querying part number failed\n"); 2097 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2098 return; 2099 } 2100 2101 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2102 2103 switch (priv->partnum) { 2104 case CP210X_PARTNUM_CP2102: 2105 cp2102_determine_quirks(serial); 2106 break; 2107 case CP210X_PARTNUM_CP2105: 2108 case CP210X_PARTNUM_CP2108: 2109 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2110 break; 2111 case CP210X_PARTNUM_CP2102N_QFN28: 2112 case CP210X_PARTNUM_CP2102N_QFN24: 2113 case CP210X_PARTNUM_CP2102N_QFN20: 2114 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2115 if (ret) 2116 break; 2117 if (priv->fw_version <= 0x10004) 2118 priv->no_flow_control = true; 2119 break; 2120 default: 2121 break; 2122 } 2123 } 2124 2125 static int cp210x_attach(struct usb_serial *serial) 2126 { 2127 int result; 2128 struct cp210x_serial_private *priv; 2129 2130 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2131 if (!priv) 2132 return -ENOMEM; 2133 2134 usb_set_serial_data(serial, priv); 2135 2136 cp210x_determine_type(serial); 2137 cp210x_init_max_speed(serial); 2138 2139 result = cp210x_gpio_init(serial); 2140 if (result < 0) { 2141 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2142 result); 2143 } 2144 2145 return 0; 2146 } 2147 2148 static void cp210x_disconnect(struct usb_serial *serial) 2149 { 2150 cp210x_gpio_remove(serial); 2151 } 2152 2153 static void cp210x_release(struct usb_serial *serial) 2154 { 2155 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2156 2157 cp210x_gpio_remove(serial); 2158 2159 kfree(priv); 2160 } 2161 2162 module_usb_serial_driver(serial_drivers, id_table); 2163 2164 MODULE_DESCRIPTION(DRIVER_DESC); 2165 MODULE_LICENSE("GPL v2"); 2166