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, 0x8414) }, /* Decagon USB Cable Adapter */ 134 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 135 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 136 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 137 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 138 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 139 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 140 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 141 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 142 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 143 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 144 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 145 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 146 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 147 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 148 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 149 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 150 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 151 { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 152 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 153 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 154 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 155 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 156 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 157 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 158 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 159 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 160 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 161 { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */ 162 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 163 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 164 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 165 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 166 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 167 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 168 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 169 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 170 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 171 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 172 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 173 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 174 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 175 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 176 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 177 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 178 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 179 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 180 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 181 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 182 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 183 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 184 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 185 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 186 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 187 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 188 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 189 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 190 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 191 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 192 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 193 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 194 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 195 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 196 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 197 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 198 { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */ 199 { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */ 200 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 201 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 202 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 203 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 204 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 205 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 206 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 207 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 208 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 209 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 210 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 211 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */ 212 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */ 213 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 214 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 215 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 216 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 217 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 218 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 219 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 220 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 221 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 222 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 223 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 224 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 225 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 226 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 227 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 228 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 229 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 230 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 231 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 232 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 233 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 234 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 235 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 236 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 237 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 238 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 239 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 240 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 241 { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */ 242 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 243 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 244 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 245 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 246 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 247 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 248 { } /* Terminating Entry */ 249 }; 250 251 MODULE_DEVICE_TABLE(usb, id_table); 252 253 struct cp210x_serial_private { 254 #ifdef CONFIG_GPIOLIB 255 struct gpio_chip gc; 256 bool gpio_registered; 257 u16 gpio_pushpull; 258 u16 gpio_altfunc; 259 u16 gpio_input; 260 #endif 261 u8 partnum; 262 u32 fw_version; 263 speed_t min_speed; 264 speed_t max_speed; 265 bool use_actual_rate; 266 bool no_flow_control; 267 bool no_event_mode; 268 }; 269 270 enum cp210x_event_state { 271 ES_DATA, 272 ES_ESCAPE, 273 ES_LSR, 274 ES_LSR_DATA_0, 275 ES_LSR_DATA_1, 276 ES_MSR 277 }; 278 279 struct cp210x_port_private { 280 u8 bInterfaceNumber; 281 bool event_mode; 282 enum cp210x_event_state event_state; 283 u8 lsr; 284 285 struct mutex mutex; 286 bool crtscts; 287 bool dtr; 288 bool rts; 289 }; 290 291 static struct usb_serial_driver cp210x_device = { 292 .driver = { 293 .owner = THIS_MODULE, 294 .name = "cp210x", 295 }, 296 .id_table = id_table, 297 .num_ports = 1, 298 .bulk_in_size = 256, 299 .bulk_out_size = 256, 300 .open = cp210x_open, 301 .close = cp210x_close, 302 .break_ctl = cp210x_break_ctl, 303 .set_termios = cp210x_set_termios, 304 .tx_empty = cp210x_tx_empty, 305 .throttle = usb_serial_generic_throttle, 306 .unthrottle = usb_serial_generic_unthrottle, 307 .tiocmget = cp210x_tiocmget, 308 .tiocmset = cp210x_tiocmset, 309 .get_icount = usb_serial_generic_get_icount, 310 .attach = cp210x_attach, 311 .disconnect = cp210x_disconnect, 312 .release = cp210x_release, 313 .port_probe = cp210x_port_probe, 314 .port_remove = cp210x_port_remove, 315 .dtr_rts = cp210x_dtr_rts, 316 .process_read_urb = cp210x_process_read_urb, 317 }; 318 319 static struct usb_serial_driver * const serial_drivers[] = { 320 &cp210x_device, NULL 321 }; 322 323 /* Config request types */ 324 #define REQTYPE_HOST_TO_INTERFACE 0x41 325 #define REQTYPE_INTERFACE_TO_HOST 0xc1 326 #define REQTYPE_HOST_TO_DEVICE 0x40 327 #define REQTYPE_DEVICE_TO_HOST 0xc0 328 329 /* Config request codes */ 330 #define CP210X_IFC_ENABLE 0x00 331 #define CP210X_SET_BAUDDIV 0x01 332 #define CP210X_GET_BAUDDIV 0x02 333 #define CP210X_SET_LINE_CTL 0x03 334 #define CP210X_GET_LINE_CTL 0x04 335 #define CP210X_SET_BREAK 0x05 336 #define CP210X_IMM_CHAR 0x06 337 #define CP210X_SET_MHS 0x07 338 #define CP210X_GET_MDMSTS 0x08 339 #define CP210X_SET_XON 0x09 340 #define CP210X_SET_XOFF 0x0A 341 #define CP210X_SET_EVENTMASK 0x0B 342 #define CP210X_GET_EVENTMASK 0x0C 343 #define CP210X_SET_CHAR 0x0D 344 #define CP210X_GET_CHARS 0x0E 345 #define CP210X_GET_PROPS 0x0F 346 #define CP210X_GET_COMM_STATUS 0x10 347 #define CP210X_RESET 0x11 348 #define CP210X_PURGE 0x12 349 #define CP210X_SET_FLOW 0x13 350 #define CP210X_GET_FLOW 0x14 351 #define CP210X_EMBED_EVENTS 0x15 352 #define CP210X_GET_EVENTSTATE 0x16 353 #define CP210X_SET_CHARS 0x19 354 #define CP210X_GET_BAUDRATE 0x1D 355 #define CP210X_SET_BAUDRATE 0x1E 356 #define CP210X_VENDOR_SPECIFIC 0xFF 357 358 /* CP210X_IFC_ENABLE */ 359 #define UART_ENABLE 0x0001 360 #define UART_DISABLE 0x0000 361 362 /* CP210X_(SET|GET)_BAUDDIV */ 363 #define BAUD_RATE_GEN_FREQ 0x384000 364 365 /* CP210X_(SET|GET)_LINE_CTL */ 366 #define BITS_DATA_MASK 0X0f00 367 #define BITS_DATA_5 0X0500 368 #define BITS_DATA_6 0X0600 369 #define BITS_DATA_7 0X0700 370 #define BITS_DATA_8 0X0800 371 #define BITS_DATA_9 0X0900 372 373 #define BITS_PARITY_MASK 0x00f0 374 #define BITS_PARITY_NONE 0x0000 375 #define BITS_PARITY_ODD 0x0010 376 #define BITS_PARITY_EVEN 0x0020 377 #define BITS_PARITY_MARK 0x0030 378 #define BITS_PARITY_SPACE 0x0040 379 380 #define BITS_STOP_MASK 0x000f 381 #define BITS_STOP_1 0x0000 382 #define BITS_STOP_1_5 0x0001 383 #define BITS_STOP_2 0x0002 384 385 /* CP210X_SET_BREAK */ 386 #define BREAK_ON 0x0001 387 #define BREAK_OFF 0x0000 388 389 /* CP210X_(SET_MHS|GET_MDMSTS) */ 390 #define CONTROL_DTR 0x0001 391 #define CONTROL_RTS 0x0002 392 #define CONTROL_CTS 0x0010 393 #define CONTROL_DSR 0x0020 394 #define CONTROL_RING 0x0040 395 #define CONTROL_DCD 0x0080 396 #define CONTROL_WRITE_DTR 0x0100 397 #define CONTROL_WRITE_RTS 0x0200 398 399 /* CP210X_(GET|SET)_CHARS */ 400 struct cp210x_special_chars { 401 u8 bEofChar; 402 u8 bErrorChar; 403 u8 bBreakChar; 404 u8 bEventChar; 405 u8 bXonChar; 406 u8 bXoffChar; 407 }; 408 409 /* CP210X_VENDOR_SPECIFIC values */ 410 #define CP210X_GET_FW_VER 0x000E 411 #define CP210X_READ_2NCONFIG 0x000E 412 #define CP210X_GET_FW_VER_2N 0x0010 413 #define CP210X_READ_LATCH 0x00C2 414 #define CP210X_GET_PARTNUM 0x370B 415 #define CP210X_GET_PORTCONFIG 0x370C 416 #define CP210X_GET_DEVICEMODE 0x3711 417 #define CP210X_WRITE_LATCH 0x37E1 418 419 /* Part number definitions */ 420 #define CP210X_PARTNUM_CP2101 0x01 421 #define CP210X_PARTNUM_CP2102 0x02 422 #define CP210X_PARTNUM_CP2103 0x03 423 #define CP210X_PARTNUM_CP2104 0x04 424 #define CP210X_PARTNUM_CP2105 0x05 425 #define CP210X_PARTNUM_CP2108 0x08 426 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 427 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 428 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 429 #define CP210X_PARTNUM_UNKNOWN 0xFF 430 431 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 432 struct cp210x_comm_status { 433 __le32 ulErrors; 434 __le32 ulHoldReasons; 435 __le32 ulAmountInInQueue; 436 __le32 ulAmountInOutQueue; 437 u8 bEofReceived; 438 u8 bWaitForImmediate; 439 u8 bReserved; 440 } __packed; 441 442 /* 443 * CP210X_PURGE - 16 bits passed in wValue of USB request. 444 * SiLabs app note AN571 gives a strange description of the 4 bits: 445 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 446 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 447 */ 448 #define PURGE_ALL 0x000f 449 450 /* CP210X_EMBED_EVENTS */ 451 #define CP210X_ESCCHAR 0xec 452 453 #define CP210X_LSR_OVERRUN BIT(1) 454 #define CP210X_LSR_PARITY BIT(2) 455 #define CP210X_LSR_FRAME BIT(3) 456 #define CP210X_LSR_BREAK BIT(4) 457 458 459 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 460 struct cp210x_flow_ctl { 461 __le32 ulControlHandshake; 462 __le32 ulFlowReplace; 463 __le32 ulXonLimit; 464 __le32 ulXoffLimit; 465 }; 466 467 /* cp210x_flow_ctl::ulControlHandshake */ 468 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 469 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 470 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 471 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 472 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 473 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 474 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 475 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 476 477 /* cp210x_flow_ctl::ulFlowReplace */ 478 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 479 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 480 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 481 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 482 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 483 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 484 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 485 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 486 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 487 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 488 489 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 490 struct cp210x_pin_mode { 491 u8 eci; 492 u8 sci; 493 }; 494 495 #define CP210X_PIN_MODE_MODEM 0 496 #define CP210X_PIN_MODE_GPIO BIT(0) 497 498 /* 499 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 500 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 501 */ 502 struct cp210x_dual_port_config { 503 __le16 gpio_mode; 504 u8 __pad0[2]; 505 __le16 reset_state; 506 u8 __pad1[4]; 507 __le16 suspend_state; 508 u8 sci_cfg; 509 u8 eci_cfg; 510 u8 device_cfg; 511 } __packed; 512 513 /* 514 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 515 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 516 */ 517 struct cp210x_single_port_config { 518 __le16 gpio_mode; 519 u8 __pad0[2]; 520 __le16 reset_state; 521 u8 __pad1[4]; 522 __le16 suspend_state; 523 u8 device_cfg; 524 } __packed; 525 526 /* GPIO modes */ 527 #define CP210X_SCI_GPIO_MODE_OFFSET 9 528 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 529 530 #define CP210X_ECI_GPIO_MODE_OFFSET 2 531 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 532 533 #define CP210X_GPIO_MODE_OFFSET 8 534 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 535 536 /* CP2105 port configuration values */ 537 #define CP2105_GPIO0_TXLED_MODE BIT(0) 538 #define CP2105_GPIO1_RXLED_MODE BIT(1) 539 #define CP2105_GPIO1_RS485_MODE BIT(2) 540 541 /* CP2104 port configuration values */ 542 #define CP2104_GPIO0_TXLED_MODE BIT(0) 543 #define CP2104_GPIO1_RXLED_MODE BIT(1) 544 #define CP2104_GPIO2_RS485_MODE BIT(2) 545 546 struct cp210x_quad_port_state { 547 __le16 gpio_mode_pb0; 548 __le16 gpio_mode_pb1; 549 __le16 gpio_mode_pb2; 550 __le16 gpio_mode_pb3; 551 __le16 gpio_mode_pb4; 552 553 __le16 gpio_lowpower_pb0; 554 __le16 gpio_lowpower_pb1; 555 __le16 gpio_lowpower_pb2; 556 __le16 gpio_lowpower_pb3; 557 __le16 gpio_lowpower_pb4; 558 559 __le16 gpio_latch_pb0; 560 __le16 gpio_latch_pb1; 561 __le16 gpio_latch_pb2; 562 __le16 gpio_latch_pb3; 563 __le16 gpio_latch_pb4; 564 }; 565 566 /* 567 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes 568 * on a CP2108 chip. 569 * 570 * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf 571 */ 572 struct cp210x_quad_port_config { 573 struct cp210x_quad_port_state reset_state; 574 struct cp210x_quad_port_state suspend_state; 575 u8 ipdelay_ifc[4]; 576 u8 enhancedfxn_ifc[4]; 577 u8 enhancedfxn_device; 578 u8 extclkfreq[4]; 579 } __packed; 580 581 #define CP2108_EF_IFC_GPIO_TXLED 0x01 582 #define CP2108_EF_IFC_GPIO_RXLED 0x02 583 #define CP2108_EF_IFC_GPIO_RS485 0x04 584 #define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08 585 #define CP2108_EF_IFC_GPIO_CLOCK 0x10 586 #define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40 587 588 /* CP2102N configuration array indices */ 589 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 590 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 591 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 592 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 593 594 /* CP2102N QFN20 port configuration values */ 595 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 596 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 597 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 598 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 599 600 /* 601 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes 602 * for CP2102N, CP2103, CP2104 and CP2105. 603 */ 604 struct cp210x_gpio_write { 605 u8 mask; 606 u8 state; 607 }; 608 609 /* 610 * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes 611 * for CP2108. 612 */ 613 struct cp210x_gpio_write16 { 614 __le16 mask; 615 __le16 state; 616 }; 617 618 /* 619 * Helper to get interface number when we only have struct usb_serial. 620 */ 621 static u8 cp210x_interface_num(struct usb_serial *serial) 622 { 623 struct usb_host_interface *cur_altsetting; 624 625 cur_altsetting = serial->interface->cur_altsetting; 626 627 return cur_altsetting->desc.bInterfaceNumber; 628 } 629 630 /* 631 * Reads a variable-sized block of CP210X_ registers, identified by req. 632 * Returns data into buf in native USB byte order. 633 */ 634 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 635 void *buf, int bufsize) 636 { 637 struct usb_serial *serial = port->serial; 638 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 639 int result; 640 641 642 result = usb_control_msg_recv(serial->dev, 0, req, 643 REQTYPE_INTERFACE_TO_HOST, 0, 644 port_priv->bInterfaceNumber, buf, bufsize, 645 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 646 if (result) { 647 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 648 req, bufsize, result); 649 return result; 650 } 651 652 return 0; 653 } 654 655 /* 656 * Reads any 8-bit CP210X_ register identified by req. 657 */ 658 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 659 { 660 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 661 } 662 663 /* 664 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 665 * Returns data into buf in native USB byte order. 666 */ 667 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 668 void *buf, int bufsize) 669 { 670 int result; 671 672 result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 673 type, val, cp210x_interface_num(serial), buf, bufsize, 674 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 675 if (result) { 676 dev_err(&serial->interface->dev, 677 "failed to get vendor val 0x%04x size %d: %d\n", val, 678 bufsize, result); 679 return result; 680 } 681 682 return 0; 683 } 684 685 /* 686 * Writes any 16-bit CP210X_ register (req) whose value is passed 687 * entirely in the wValue field of the USB request. 688 */ 689 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 690 { 691 struct usb_serial *serial = port->serial; 692 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 693 int result; 694 695 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 696 req, REQTYPE_HOST_TO_INTERFACE, val, 697 port_priv->bInterfaceNumber, NULL, 0, 698 USB_CTRL_SET_TIMEOUT); 699 if (result < 0) { 700 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 701 req, result); 702 } 703 704 return result; 705 } 706 707 /* 708 * Writes a variable-sized block of CP210X_ registers, identified by req. 709 * Data in buf must be in native USB byte order. 710 */ 711 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 712 void *buf, int bufsize) 713 { 714 struct usb_serial *serial = port->serial; 715 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 716 int result; 717 718 result = usb_control_msg_send(serial->dev, 0, req, 719 REQTYPE_HOST_TO_INTERFACE, 0, 720 port_priv->bInterfaceNumber, buf, bufsize, 721 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 722 if (result) { 723 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 724 req, bufsize, result); 725 return result; 726 } 727 728 return 0; 729 } 730 731 /* 732 * Writes any 32-bit CP210X_ register identified by req. 733 */ 734 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 735 { 736 __le32 le32_val; 737 738 le32_val = cpu_to_le32(val); 739 740 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 741 } 742 743 #ifdef CONFIG_GPIOLIB 744 /* 745 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 746 * Data in buf must be in native USB byte order. 747 */ 748 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 749 u16 val, void *buf, int bufsize) 750 { 751 int result; 752 753 result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC, 754 type, val, cp210x_interface_num(serial), buf, bufsize, 755 USB_CTRL_SET_TIMEOUT, GFP_KERNEL); 756 if (result) { 757 dev_err(&serial->interface->dev, 758 "failed to set vendor val 0x%04x size %d: %d\n", val, 759 bufsize, result); 760 return result; 761 } 762 763 return 0; 764 } 765 #endif 766 767 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 768 { 769 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 770 int result; 771 772 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 773 if (result) { 774 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 775 return result; 776 } 777 778 if (tty) 779 cp210x_set_termios(tty, port, NULL); 780 781 result = usb_serial_generic_open(tty, port); 782 if (result) 783 goto err_disable; 784 785 return 0; 786 787 err_disable: 788 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 789 port_priv->event_mode = false; 790 791 return result; 792 } 793 794 static void cp210x_close(struct usb_serial_port *port) 795 { 796 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 797 798 usb_serial_generic_close(port); 799 800 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 801 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 802 803 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 804 805 /* Disabling the interface disables event-insertion mode. */ 806 port_priv->event_mode = false; 807 } 808 809 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 810 { 811 if (lsr & CP210X_LSR_BREAK) { 812 port->icount.brk++; 813 *flag = TTY_BREAK; 814 } else if (lsr & CP210X_LSR_PARITY) { 815 port->icount.parity++; 816 *flag = TTY_PARITY; 817 } else if (lsr & CP210X_LSR_FRAME) { 818 port->icount.frame++; 819 *flag = TTY_FRAME; 820 } 821 822 if (lsr & CP210X_LSR_OVERRUN) { 823 port->icount.overrun++; 824 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 825 } 826 } 827 828 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 829 { 830 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 831 832 switch (port_priv->event_state) { 833 case ES_DATA: 834 if (*ch == CP210X_ESCCHAR) { 835 port_priv->event_state = ES_ESCAPE; 836 break; 837 } 838 return false; 839 case ES_ESCAPE: 840 switch (*ch) { 841 case 0: 842 dev_dbg(&port->dev, "%s - escape char\n", __func__); 843 *ch = CP210X_ESCCHAR; 844 port_priv->event_state = ES_DATA; 845 return false; 846 case 1: 847 port_priv->event_state = ES_LSR_DATA_0; 848 break; 849 case 2: 850 port_priv->event_state = ES_LSR; 851 break; 852 case 3: 853 port_priv->event_state = ES_MSR; 854 break; 855 default: 856 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 857 port_priv->event_state = ES_DATA; 858 break; 859 } 860 break; 861 case ES_LSR_DATA_0: 862 port_priv->lsr = *ch; 863 port_priv->event_state = ES_LSR_DATA_1; 864 break; 865 case ES_LSR_DATA_1: 866 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 867 __func__, port_priv->lsr, *ch); 868 cp210x_process_lsr(port, port_priv->lsr, flag); 869 port_priv->event_state = ES_DATA; 870 return false; 871 case ES_LSR: 872 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 873 port_priv->lsr = *ch; 874 cp210x_process_lsr(port, port_priv->lsr, flag); 875 port_priv->event_state = ES_DATA; 876 break; 877 case ES_MSR: 878 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 879 /* unimplemented */ 880 port_priv->event_state = ES_DATA; 881 break; 882 } 883 884 return true; 885 } 886 887 static void cp210x_process_read_urb(struct urb *urb) 888 { 889 struct usb_serial_port *port = urb->context; 890 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 891 unsigned char *ch = urb->transfer_buffer; 892 char flag; 893 int i; 894 895 if (!urb->actual_length) 896 return; 897 898 if (port_priv->event_mode) { 899 for (i = 0; i < urb->actual_length; i++, ch++) { 900 flag = TTY_NORMAL; 901 902 if (cp210x_process_char(port, ch, &flag)) 903 continue; 904 905 tty_insert_flip_char(&port->port, *ch, flag); 906 } 907 } else { 908 tty_insert_flip_string(&port->port, ch, urb->actual_length); 909 } 910 tty_flip_buffer_push(&port->port); 911 } 912 913 /* 914 * Read how many bytes are waiting in the TX queue. 915 */ 916 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 917 u32 *count) 918 { 919 struct usb_serial *serial = port->serial; 920 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 921 struct cp210x_comm_status sts; 922 int result; 923 924 result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS, 925 REQTYPE_INTERFACE_TO_HOST, 0, 926 port_priv->bInterfaceNumber, &sts, sizeof(sts), 927 USB_CTRL_GET_TIMEOUT, GFP_KERNEL); 928 if (result) { 929 dev_err(&port->dev, "failed to get comm status: %d\n", result); 930 return result; 931 } 932 933 *count = le32_to_cpu(sts.ulAmountInOutQueue); 934 935 return 0; 936 } 937 938 static bool cp210x_tx_empty(struct usb_serial_port *port) 939 { 940 int err; 941 u32 count; 942 943 err = cp210x_get_tx_queue_byte_count(port, &count); 944 if (err) 945 return true; 946 947 return !count; 948 } 949 950 struct cp210x_rate { 951 speed_t rate; 952 speed_t high; 953 }; 954 955 static const struct cp210x_rate cp210x_an205_table1[] = { 956 { 300, 300 }, 957 { 600, 600 }, 958 { 1200, 1200 }, 959 { 1800, 1800 }, 960 { 2400, 2400 }, 961 { 4000, 4000 }, 962 { 4800, 4803 }, 963 { 7200, 7207 }, 964 { 9600, 9612 }, 965 { 14400, 14428 }, 966 { 16000, 16062 }, 967 { 19200, 19250 }, 968 { 28800, 28912 }, 969 { 38400, 38601 }, 970 { 51200, 51558 }, 971 { 56000, 56280 }, 972 { 57600, 58053 }, 973 { 64000, 64111 }, 974 { 76800, 77608 }, 975 { 115200, 117028 }, 976 { 128000, 129347 }, 977 { 153600, 156868 }, 978 { 230400, 237832 }, 979 { 250000, 254234 }, 980 { 256000, 273066 }, 981 { 460800, 491520 }, 982 { 500000, 567138 }, 983 { 576000, 670254 }, 984 { 921600, UINT_MAX } 985 }; 986 987 /* 988 * Quantises the baud rate as per AN205 Table 1 989 */ 990 static speed_t cp210x_get_an205_rate(speed_t baud) 991 { 992 int i; 993 994 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 995 if (baud <= cp210x_an205_table1[i].high) 996 break; 997 } 998 999 return cp210x_an205_table1[i].rate; 1000 } 1001 1002 static speed_t cp210x_get_actual_rate(speed_t baud) 1003 { 1004 unsigned int prescale = 1; 1005 unsigned int div; 1006 1007 if (baud <= 365) 1008 prescale = 4; 1009 1010 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1011 baud = 48000000 / (2 * prescale * div); 1012 1013 return baud; 1014 } 1015 1016 /* 1017 * CP2101 supports the following baud rates: 1018 * 1019 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1020 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1021 * 1022 * CP2102 and CP2103 support the following additional rates: 1023 * 1024 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1025 * 576000 1026 * 1027 * The device will map a requested rate to a supported one, but the result 1028 * of requests for rates greater than 1053257 is undefined (see AN205). 1029 * 1030 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1031 * respectively, with an error less than 1%. The actual rates are determined 1032 * by 1033 * 1034 * div = round(freq / (2 x prescale x request)) 1035 * actual = freq / (2 x prescale x div) 1036 * 1037 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1038 * or 1 otherwise. 1039 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1040 * otherwise. 1041 */ 1042 static void cp210x_change_speed(struct tty_struct *tty, 1043 struct usb_serial_port *port, struct ktermios *old_termios) 1044 { 1045 struct usb_serial *serial = port->serial; 1046 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1047 u32 baud; 1048 1049 /* 1050 * This maps the requested rate to the actual rate, a valid rate on 1051 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1052 * 1053 * NOTE: B0 is not implemented. 1054 */ 1055 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1056 1057 if (priv->use_actual_rate) 1058 baud = cp210x_get_actual_rate(baud); 1059 else if (baud < 1000000) 1060 baud = cp210x_get_an205_rate(baud); 1061 1062 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1063 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1064 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1065 if (old_termios) 1066 baud = old_termios->c_ospeed; 1067 else 1068 baud = 9600; 1069 } 1070 1071 tty_encode_baud_rate(tty, baud, baud); 1072 } 1073 1074 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1075 { 1076 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1077 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1078 int ret; 1079 1080 if (port_priv->event_mode) 1081 return; 1082 1083 if (priv->no_event_mode) 1084 return; 1085 1086 port_priv->event_state = ES_DATA; 1087 port_priv->event_mode = true; 1088 1089 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1090 if (ret) { 1091 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1092 port_priv->event_mode = false; 1093 } 1094 } 1095 1096 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1097 { 1098 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1099 int ret; 1100 1101 if (!port_priv->event_mode) 1102 return; 1103 1104 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1105 if (ret) { 1106 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1107 return; 1108 } 1109 1110 port_priv->event_mode = false; 1111 } 1112 1113 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1114 { 1115 bool iflag_change, cc_change; 1116 1117 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1118 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1119 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1120 1121 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1122 } 1123 1124 static void cp210x_set_flow_control(struct tty_struct *tty, 1125 struct usb_serial_port *port, struct ktermios *old_termios) 1126 { 1127 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1128 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1129 struct cp210x_special_chars chars; 1130 struct cp210x_flow_ctl flow_ctl; 1131 u32 flow_repl; 1132 u32 ctl_hs; 1133 bool crtscts; 1134 int ret; 1135 1136 /* 1137 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1138 * CP2102N_E104). Report back that flow control is not supported. 1139 */ 1140 if (priv->no_flow_control) { 1141 tty->termios.c_cflag &= ~CRTSCTS; 1142 tty->termios.c_iflag &= ~(IXON | IXOFF); 1143 } 1144 1145 if (old_termios && 1146 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1147 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1148 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1149 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1150 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1151 return; 1152 } 1153 1154 if (I_IXON(tty) || I_IXOFF(tty)) { 1155 memset(&chars, 0, sizeof(chars)); 1156 1157 chars.bXonChar = START_CHAR(tty); 1158 chars.bXoffChar = STOP_CHAR(tty); 1159 1160 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1161 sizeof(chars)); 1162 if (ret) { 1163 dev_err(&port->dev, "failed to set special chars: %d\n", 1164 ret); 1165 } 1166 } 1167 1168 mutex_lock(&port_priv->mutex); 1169 1170 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1171 sizeof(flow_ctl)); 1172 if (ret) 1173 goto out_unlock; 1174 1175 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1176 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1177 1178 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1179 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1180 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1181 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1182 if (port_priv->dtr) 1183 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1184 else 1185 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1186 1187 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1188 if (C_CRTSCTS(tty)) { 1189 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1190 if (port_priv->rts) 1191 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1192 else 1193 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1194 crtscts = true; 1195 } else { 1196 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1197 if (port_priv->rts) 1198 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1199 else 1200 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1201 crtscts = false; 1202 } 1203 1204 if (I_IXOFF(tty)) { 1205 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1206 1207 flow_ctl.ulXonLimit = cpu_to_le32(128); 1208 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1209 } else { 1210 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1211 } 1212 1213 if (I_IXON(tty)) 1214 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1215 else 1216 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1217 1218 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1219 ctl_hs, flow_repl); 1220 1221 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1222 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1223 1224 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1225 sizeof(flow_ctl)); 1226 if (ret) 1227 goto out_unlock; 1228 1229 port_priv->crtscts = crtscts; 1230 out_unlock: 1231 mutex_unlock(&port_priv->mutex); 1232 } 1233 1234 static void cp210x_set_termios(struct tty_struct *tty, 1235 struct usb_serial_port *port, struct ktermios *old_termios) 1236 { 1237 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1238 u16 bits; 1239 int ret; 1240 1241 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1242 return; 1243 1244 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1245 cp210x_change_speed(tty, port, old_termios); 1246 1247 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1248 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1249 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1250 tty->termios.c_cflag |= CS8; 1251 } 1252 1253 bits = 0; 1254 1255 switch (C_CSIZE(tty)) { 1256 case CS5: 1257 bits |= BITS_DATA_5; 1258 break; 1259 case CS6: 1260 bits |= BITS_DATA_6; 1261 break; 1262 case CS7: 1263 bits |= BITS_DATA_7; 1264 break; 1265 case CS8: 1266 default: 1267 bits |= BITS_DATA_8; 1268 break; 1269 } 1270 1271 if (C_PARENB(tty)) { 1272 if (C_CMSPAR(tty)) { 1273 if (C_PARODD(tty)) 1274 bits |= BITS_PARITY_MARK; 1275 else 1276 bits |= BITS_PARITY_SPACE; 1277 } else { 1278 if (C_PARODD(tty)) 1279 bits |= BITS_PARITY_ODD; 1280 else 1281 bits |= BITS_PARITY_EVEN; 1282 } 1283 } 1284 1285 if (C_CSTOPB(tty)) 1286 bits |= BITS_STOP_2; 1287 else 1288 bits |= BITS_STOP_1; 1289 1290 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1291 if (ret) 1292 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1293 1294 cp210x_set_flow_control(tty, port, old_termios); 1295 1296 /* 1297 * Enable event-insertion mode only if input parity checking is 1298 * enabled for now. 1299 */ 1300 if (I_INPCK(tty)) 1301 cp210x_enable_event_mode(port); 1302 else 1303 cp210x_disable_event_mode(port); 1304 } 1305 1306 static int cp210x_tiocmset(struct tty_struct *tty, 1307 unsigned int set, unsigned int clear) 1308 { 1309 struct usb_serial_port *port = tty->driver_data; 1310 return cp210x_tiocmset_port(port, set, clear); 1311 } 1312 1313 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1314 unsigned int set, unsigned int clear) 1315 { 1316 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1317 struct cp210x_flow_ctl flow_ctl; 1318 u32 ctl_hs, flow_repl; 1319 u16 control = 0; 1320 int ret; 1321 1322 mutex_lock(&port_priv->mutex); 1323 1324 if (set & TIOCM_RTS) { 1325 port_priv->rts = true; 1326 control |= CONTROL_RTS; 1327 control |= CONTROL_WRITE_RTS; 1328 } 1329 if (set & TIOCM_DTR) { 1330 port_priv->dtr = true; 1331 control |= CONTROL_DTR; 1332 control |= CONTROL_WRITE_DTR; 1333 } 1334 if (clear & TIOCM_RTS) { 1335 port_priv->rts = false; 1336 control &= ~CONTROL_RTS; 1337 control |= CONTROL_WRITE_RTS; 1338 } 1339 if (clear & TIOCM_DTR) { 1340 port_priv->dtr = false; 1341 control &= ~CONTROL_DTR; 1342 control |= CONTROL_WRITE_DTR; 1343 } 1344 1345 /* 1346 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1347 * flow control is enabled. 1348 */ 1349 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1350 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1351 sizeof(flow_ctl)); 1352 if (ret) 1353 goto out_unlock; 1354 1355 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1356 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1357 1358 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1359 if (port_priv->dtr) 1360 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1361 else 1362 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1363 1364 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1365 if (port_priv->rts) 1366 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1367 else 1368 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1369 1370 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1371 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1372 1373 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1374 __func__, ctl_hs, flow_repl); 1375 1376 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1377 sizeof(flow_ctl)); 1378 } else { 1379 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1380 1381 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1382 } 1383 out_unlock: 1384 mutex_unlock(&port_priv->mutex); 1385 1386 return ret; 1387 } 1388 1389 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1390 { 1391 if (on) 1392 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1393 else 1394 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1395 } 1396 1397 static int cp210x_tiocmget(struct tty_struct *tty) 1398 { 1399 struct usb_serial_port *port = tty->driver_data; 1400 u8 control; 1401 int result; 1402 1403 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1404 if (result) 1405 return result; 1406 1407 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1408 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1409 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1410 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1411 |((control & CONTROL_RING)? TIOCM_RI : 0) 1412 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1413 1414 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1415 1416 return result; 1417 } 1418 1419 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1420 { 1421 struct usb_serial_port *port = tty->driver_data; 1422 u16 state; 1423 1424 if (break_state == 0) 1425 state = BREAK_OFF; 1426 else 1427 state = BREAK_ON; 1428 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1429 state == BREAK_OFF ? "off" : "on"); 1430 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1431 } 1432 1433 #ifdef CONFIG_GPIOLIB 1434 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1435 { 1436 struct usb_serial *serial = gpiochip_get_data(gc); 1437 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1438 u8 req_type; 1439 u16 mask; 1440 int result; 1441 int len; 1442 1443 result = usb_autopm_get_interface(serial->interface); 1444 if (result) 1445 return result; 1446 1447 switch (priv->partnum) { 1448 case CP210X_PARTNUM_CP2105: 1449 req_type = REQTYPE_INTERFACE_TO_HOST; 1450 len = 1; 1451 break; 1452 case CP210X_PARTNUM_CP2108: 1453 req_type = REQTYPE_INTERFACE_TO_HOST; 1454 len = 2; 1455 break; 1456 default: 1457 req_type = REQTYPE_DEVICE_TO_HOST; 1458 len = 1; 1459 break; 1460 } 1461 1462 mask = 0; 1463 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1464 &mask, len); 1465 1466 usb_autopm_put_interface(serial->interface); 1467 1468 if (result < 0) 1469 return result; 1470 1471 le16_to_cpus(&mask); 1472 1473 return !!(mask & BIT(gpio)); 1474 } 1475 1476 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1477 { 1478 struct usb_serial *serial = gpiochip_get_data(gc); 1479 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1480 struct cp210x_gpio_write16 buf16; 1481 struct cp210x_gpio_write buf; 1482 u16 mask, state; 1483 u16 wIndex; 1484 int result; 1485 1486 if (value == 1) 1487 state = BIT(gpio); 1488 else 1489 state = 0; 1490 1491 mask = BIT(gpio); 1492 1493 result = usb_autopm_get_interface(serial->interface); 1494 if (result) 1495 goto out; 1496 1497 switch (priv->partnum) { 1498 case CP210X_PARTNUM_CP2105: 1499 buf.mask = (u8)mask; 1500 buf.state = (u8)state; 1501 result = cp210x_write_vendor_block(serial, 1502 REQTYPE_HOST_TO_INTERFACE, 1503 CP210X_WRITE_LATCH, &buf, 1504 sizeof(buf)); 1505 break; 1506 case CP210X_PARTNUM_CP2108: 1507 buf16.mask = cpu_to_le16(mask); 1508 buf16.state = cpu_to_le16(state); 1509 result = cp210x_write_vendor_block(serial, 1510 REQTYPE_HOST_TO_INTERFACE, 1511 CP210X_WRITE_LATCH, &buf16, 1512 sizeof(buf16)); 1513 break; 1514 default: 1515 wIndex = state << 8 | mask; 1516 result = usb_control_msg(serial->dev, 1517 usb_sndctrlpipe(serial->dev, 0), 1518 CP210X_VENDOR_SPECIFIC, 1519 REQTYPE_HOST_TO_DEVICE, 1520 CP210X_WRITE_LATCH, 1521 wIndex, 1522 NULL, 0, USB_CTRL_SET_TIMEOUT); 1523 break; 1524 } 1525 1526 usb_autopm_put_interface(serial->interface); 1527 out: 1528 if (result < 0) { 1529 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1530 result); 1531 } 1532 } 1533 1534 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1535 { 1536 struct usb_serial *serial = gpiochip_get_data(gc); 1537 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1538 1539 return priv->gpio_input & BIT(gpio); 1540 } 1541 1542 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1543 { 1544 struct usb_serial *serial = gpiochip_get_data(gc); 1545 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1546 1547 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1548 /* hardware does not support an input mode */ 1549 return -ENOTSUPP; 1550 } 1551 1552 /* push-pull pins cannot be changed to be inputs */ 1553 if (priv->gpio_pushpull & BIT(gpio)) 1554 return -EINVAL; 1555 1556 /* make sure to release pin if it is being driven low */ 1557 cp210x_gpio_set(gc, gpio, 1); 1558 1559 priv->gpio_input |= BIT(gpio); 1560 1561 return 0; 1562 } 1563 1564 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1565 int value) 1566 { 1567 struct usb_serial *serial = gpiochip_get_data(gc); 1568 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1569 1570 priv->gpio_input &= ~BIT(gpio); 1571 cp210x_gpio_set(gc, gpio, value); 1572 1573 return 0; 1574 } 1575 1576 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1577 unsigned long config) 1578 { 1579 struct usb_serial *serial = gpiochip_get_data(gc); 1580 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1581 enum pin_config_param param = pinconf_to_config_param(config); 1582 1583 /* Succeed only if in correct mode (this can't be set at runtime) */ 1584 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1585 (priv->gpio_pushpull & BIT(gpio))) 1586 return 0; 1587 1588 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1589 !(priv->gpio_pushpull & BIT(gpio))) 1590 return 0; 1591 1592 return -ENOTSUPP; 1593 } 1594 1595 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1596 unsigned long *valid_mask, unsigned int ngpios) 1597 { 1598 struct usb_serial *serial = gpiochip_get_data(gc); 1599 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1600 struct device *dev = &serial->interface->dev; 1601 unsigned long altfunc_mask = priv->gpio_altfunc; 1602 1603 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1604 1605 if (bitmap_empty(valid_mask, ngpios)) 1606 dev_dbg(dev, "no pin configured for GPIO\n"); 1607 else 1608 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1609 valid_mask); 1610 return 0; 1611 } 1612 1613 /* 1614 * This function is for configuring GPIO using shared pins, where other signals 1615 * are made unavailable by configuring the use of GPIO. This is believed to be 1616 * only applicable to the cp2105 at this point, the other devices supported by 1617 * this driver that provide GPIO do so in a way that does not impact other 1618 * signals and are thus expected to have very different initialisation. 1619 */ 1620 static int cp2105_gpioconf_init(struct usb_serial *serial) 1621 { 1622 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1623 struct cp210x_pin_mode mode; 1624 struct cp210x_dual_port_config config; 1625 u8 intf_num = cp210x_interface_num(serial); 1626 u8 iface_config; 1627 int result; 1628 1629 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1630 CP210X_GET_DEVICEMODE, &mode, 1631 sizeof(mode)); 1632 if (result < 0) 1633 return result; 1634 1635 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1636 CP210X_GET_PORTCONFIG, &config, 1637 sizeof(config)); 1638 if (result < 0) 1639 return result; 1640 1641 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1642 if (intf_num == 0) { 1643 priv->gc.ngpio = 2; 1644 1645 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1646 /* mark all GPIOs of this interface as reserved */ 1647 priv->gpio_altfunc = 0xff; 1648 return 0; 1649 } 1650 1651 iface_config = config.eci_cfg; 1652 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1653 CP210X_ECI_GPIO_MODE_MASK) >> 1654 CP210X_ECI_GPIO_MODE_OFFSET); 1655 } else if (intf_num == 1) { 1656 priv->gc.ngpio = 3; 1657 1658 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1659 /* mark all GPIOs of this interface as reserved */ 1660 priv->gpio_altfunc = 0xff; 1661 return 0; 1662 } 1663 1664 iface_config = config.sci_cfg; 1665 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1666 CP210X_SCI_GPIO_MODE_MASK) >> 1667 CP210X_SCI_GPIO_MODE_OFFSET); 1668 } else { 1669 return -ENODEV; 1670 } 1671 1672 /* mark all pins which are not in GPIO mode */ 1673 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1674 priv->gpio_altfunc |= BIT(0); 1675 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1676 CP2105_GPIO1_RS485_MODE)) 1677 priv->gpio_altfunc |= BIT(1); 1678 1679 /* driver implementation for CP2105 only supports outputs */ 1680 priv->gpio_input = 0; 1681 1682 return 0; 1683 } 1684 1685 static int cp2104_gpioconf_init(struct usb_serial *serial) 1686 { 1687 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1688 struct cp210x_single_port_config config; 1689 u8 iface_config; 1690 u8 gpio_latch; 1691 int result; 1692 u8 i; 1693 1694 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1695 CP210X_GET_PORTCONFIG, &config, 1696 sizeof(config)); 1697 if (result < 0) 1698 return result; 1699 1700 priv->gc.ngpio = 4; 1701 1702 iface_config = config.device_cfg; 1703 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1704 CP210X_GPIO_MODE_MASK) >> 1705 CP210X_GPIO_MODE_OFFSET); 1706 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1707 CP210X_GPIO_MODE_MASK) >> 1708 CP210X_GPIO_MODE_OFFSET); 1709 1710 /* mark all pins which are not in GPIO mode */ 1711 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1712 priv->gpio_altfunc |= BIT(0); 1713 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1714 priv->gpio_altfunc |= BIT(1); 1715 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1716 priv->gpio_altfunc |= BIT(2); 1717 1718 /* 1719 * Like CP2102N, CP2104 has also no strict input and output pin 1720 * modes. 1721 * Do the same input mode emulation as CP2102N. 1722 */ 1723 for (i = 0; i < priv->gc.ngpio; ++i) { 1724 /* 1725 * Set direction to "input" iff pin is open-drain and reset 1726 * value is 1. 1727 */ 1728 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1729 priv->gpio_input |= BIT(i); 1730 } 1731 1732 return 0; 1733 } 1734 1735 static int cp2108_gpio_init(struct usb_serial *serial) 1736 { 1737 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1738 struct cp210x_quad_port_config config; 1739 u16 gpio_latch; 1740 int result; 1741 u8 i; 1742 1743 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1744 CP210X_GET_PORTCONFIG, &config, 1745 sizeof(config)); 1746 if (result < 0) 1747 return result; 1748 1749 priv->gc.ngpio = 16; 1750 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1751 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1752 1753 /* 1754 * Mark all pins which are not in GPIO mode. 1755 * 1756 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1757 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1758 * 1759 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1760 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1761 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1762 */ 1763 for (i = 0; i < 4; i++) { 1764 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1765 priv->gpio_altfunc |= BIT(i * 4); 1766 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1767 priv->gpio_altfunc |= BIT((i * 4) + 1); 1768 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1769 priv->gpio_altfunc |= BIT((i * 4) + 2); 1770 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1771 priv->gpio_altfunc |= BIT((i * 4) + 3); 1772 } 1773 1774 /* 1775 * Like CP2102N, CP2108 has also no strict input and output pin 1776 * modes. Do the same input mode emulation as CP2102N. 1777 */ 1778 for (i = 0; i < priv->gc.ngpio; ++i) { 1779 /* 1780 * Set direction to "input" iff pin is open-drain and reset 1781 * value is 1. 1782 */ 1783 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1784 priv->gpio_input |= BIT(i); 1785 } 1786 1787 return 0; 1788 } 1789 1790 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1791 { 1792 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1793 const u16 config_size = 0x02a6; 1794 u8 gpio_rst_latch; 1795 u8 config_version; 1796 u8 gpio_pushpull; 1797 u8 *config_buf; 1798 u8 gpio_latch; 1799 u8 gpio_ctrl; 1800 int result; 1801 u8 i; 1802 1803 /* 1804 * Retrieve device configuration from the device. 1805 * The array received contains all customization settings done at the 1806 * factory/manufacturer. Format of the array is documented at the 1807 * time of writing at: 1808 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1809 */ 1810 config_buf = kmalloc(config_size, GFP_KERNEL); 1811 if (!config_buf) 1812 return -ENOMEM; 1813 1814 result = cp210x_read_vendor_block(serial, 1815 REQTYPE_DEVICE_TO_HOST, 1816 CP210X_READ_2NCONFIG, 1817 config_buf, 1818 config_size); 1819 if (result < 0) { 1820 kfree(config_buf); 1821 return result; 1822 } 1823 1824 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1825 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1826 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1827 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1828 1829 kfree(config_buf); 1830 1831 /* Make sure this is a config format we understand. */ 1832 if (config_version != 0x01) 1833 return -ENOTSUPP; 1834 1835 priv->gc.ngpio = 4; 1836 1837 /* 1838 * Get default pin states after reset. Needed so we can determine 1839 * the direction of an open-drain pin. 1840 */ 1841 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1842 1843 /* 0 indicates open-drain mode, 1 is push-pull */ 1844 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1845 1846 /* 0 indicates GPIO mode, 1 is alternate function */ 1847 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1848 /* QFN20 is special... */ 1849 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1850 priv->gpio_altfunc |= BIT(0); 1851 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1852 priv->gpio_altfunc |= BIT(1); 1853 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1854 priv->gpio_altfunc |= BIT(2); 1855 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1856 priv->gpio_altfunc |= BIT(3); 1857 } else { 1858 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1859 } 1860 1861 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1862 /* 1863 * For the QFN28 package, GPIO4-6 are controlled by 1864 * the low three bits of the mode/latch fields. 1865 * Contrary to the document linked above, the bits for 1866 * the SUSPEND pins are elsewhere. No alternate 1867 * function is available for these pins. 1868 */ 1869 priv->gc.ngpio = 7; 1870 gpio_latch |= (gpio_rst_latch & 7) << 4; 1871 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1872 } 1873 1874 /* 1875 * The CP2102N does not strictly has input and output pin modes, 1876 * it only knows open-drain and push-pull modes which is set at 1877 * factory. An open-drain pin can function both as an 1878 * input or an output. We emulate input mode for open-drain pins 1879 * by making sure they are not driven low, and we do not allow 1880 * push-pull pins to be set as an input. 1881 */ 1882 for (i = 0; i < priv->gc.ngpio; ++i) { 1883 /* 1884 * Set direction to "input" iff pin is open-drain and reset 1885 * value is 1. 1886 */ 1887 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1888 priv->gpio_input |= BIT(i); 1889 } 1890 1891 return 0; 1892 } 1893 1894 static int cp210x_gpio_init(struct usb_serial *serial) 1895 { 1896 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1897 int result; 1898 1899 switch (priv->partnum) { 1900 case CP210X_PARTNUM_CP2104: 1901 result = cp2104_gpioconf_init(serial); 1902 break; 1903 case CP210X_PARTNUM_CP2105: 1904 result = cp2105_gpioconf_init(serial); 1905 break; 1906 case CP210X_PARTNUM_CP2108: 1907 /* 1908 * The GPIOs are not tied to any specific port so only register 1909 * once for interface 0. 1910 */ 1911 if (cp210x_interface_num(serial) != 0) 1912 return 0; 1913 result = cp2108_gpio_init(serial); 1914 break; 1915 case CP210X_PARTNUM_CP2102N_QFN28: 1916 case CP210X_PARTNUM_CP2102N_QFN24: 1917 case CP210X_PARTNUM_CP2102N_QFN20: 1918 result = cp2102n_gpioconf_init(serial); 1919 break; 1920 default: 1921 return 0; 1922 } 1923 1924 if (result < 0) 1925 return result; 1926 1927 priv->gc.label = "cp210x"; 1928 priv->gc.get_direction = cp210x_gpio_direction_get; 1929 priv->gc.direction_input = cp210x_gpio_direction_input; 1930 priv->gc.direction_output = cp210x_gpio_direction_output; 1931 priv->gc.get = cp210x_gpio_get; 1932 priv->gc.set = cp210x_gpio_set; 1933 priv->gc.set_config = cp210x_gpio_set_config; 1934 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1935 priv->gc.owner = THIS_MODULE; 1936 priv->gc.parent = &serial->interface->dev; 1937 priv->gc.base = -1; 1938 priv->gc.can_sleep = true; 1939 1940 result = gpiochip_add_data(&priv->gc, serial); 1941 if (!result) 1942 priv->gpio_registered = true; 1943 1944 return result; 1945 } 1946 1947 static void cp210x_gpio_remove(struct usb_serial *serial) 1948 { 1949 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1950 1951 if (priv->gpio_registered) { 1952 gpiochip_remove(&priv->gc); 1953 priv->gpio_registered = false; 1954 } 1955 } 1956 1957 #else 1958 1959 static int cp210x_gpio_init(struct usb_serial *serial) 1960 { 1961 return 0; 1962 } 1963 1964 static void cp210x_gpio_remove(struct usb_serial *serial) 1965 { 1966 /* Nothing to do */ 1967 } 1968 1969 #endif 1970 1971 static int cp210x_port_probe(struct usb_serial_port *port) 1972 { 1973 struct usb_serial *serial = port->serial; 1974 struct cp210x_port_private *port_priv; 1975 1976 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1977 if (!port_priv) 1978 return -ENOMEM; 1979 1980 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1981 mutex_init(&port_priv->mutex); 1982 1983 usb_set_serial_port_data(port, port_priv); 1984 1985 return 0; 1986 } 1987 1988 static void cp210x_port_remove(struct usb_serial_port *port) 1989 { 1990 struct cp210x_port_private *port_priv; 1991 1992 port_priv = usb_get_serial_port_data(port); 1993 kfree(port_priv); 1994 } 1995 1996 static void cp210x_init_max_speed(struct usb_serial *serial) 1997 { 1998 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1999 bool use_actual_rate = false; 2000 speed_t min = 300; 2001 speed_t max; 2002 2003 switch (priv->partnum) { 2004 case CP210X_PARTNUM_CP2101: 2005 max = 921600; 2006 break; 2007 case CP210X_PARTNUM_CP2102: 2008 case CP210X_PARTNUM_CP2103: 2009 max = 1000000; 2010 break; 2011 case CP210X_PARTNUM_CP2104: 2012 use_actual_rate = true; 2013 max = 2000000; 2014 break; 2015 case CP210X_PARTNUM_CP2108: 2016 max = 2000000; 2017 break; 2018 case CP210X_PARTNUM_CP2105: 2019 if (cp210x_interface_num(serial) == 0) { 2020 use_actual_rate = true; 2021 max = 2000000; /* ECI */ 2022 } else { 2023 min = 2400; 2024 max = 921600; /* SCI */ 2025 } 2026 break; 2027 case CP210X_PARTNUM_CP2102N_QFN28: 2028 case CP210X_PARTNUM_CP2102N_QFN24: 2029 case CP210X_PARTNUM_CP2102N_QFN20: 2030 use_actual_rate = true; 2031 max = 3000000; 2032 break; 2033 default: 2034 max = 2000000; 2035 break; 2036 } 2037 2038 priv->min_speed = min; 2039 priv->max_speed = max; 2040 priv->use_actual_rate = use_actual_rate; 2041 } 2042 2043 static void cp2102_determine_quirks(struct usb_serial *serial) 2044 { 2045 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2046 u8 *buf; 2047 int ret; 2048 2049 buf = kmalloc(2, GFP_KERNEL); 2050 if (!buf) 2051 return; 2052 /* 2053 * Some (possibly counterfeit) CP2102 do not support event-insertion 2054 * mode and respond differently to malformed vendor requests. 2055 * Specifically, they return one instead of two bytes when sent a 2056 * two-byte part-number request. 2057 */ 2058 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2059 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2060 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2061 if (ret == 1) { 2062 dev_dbg(&serial->interface->dev, 2063 "device does not support event-insertion mode\n"); 2064 priv->no_event_mode = true; 2065 } 2066 2067 kfree(buf); 2068 } 2069 2070 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2071 { 2072 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2073 u8 ver[3]; 2074 int ret; 2075 2076 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2077 ver, sizeof(ver)); 2078 if (ret) 2079 return ret; 2080 2081 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2082 ver[0], ver[1], ver[2]); 2083 2084 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2085 2086 return 0; 2087 } 2088 2089 static void cp210x_determine_type(struct usb_serial *serial) 2090 { 2091 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2092 int ret; 2093 2094 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2095 CP210X_GET_PARTNUM, &priv->partnum, 2096 sizeof(priv->partnum)); 2097 if (ret < 0) { 2098 dev_warn(&serial->interface->dev, 2099 "querying part number failed\n"); 2100 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2101 return; 2102 } 2103 2104 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2105 2106 switch (priv->partnum) { 2107 case CP210X_PARTNUM_CP2102: 2108 cp2102_determine_quirks(serial); 2109 break; 2110 case CP210X_PARTNUM_CP2105: 2111 case CP210X_PARTNUM_CP2108: 2112 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2113 break; 2114 case CP210X_PARTNUM_CP2102N_QFN28: 2115 case CP210X_PARTNUM_CP2102N_QFN24: 2116 case CP210X_PARTNUM_CP2102N_QFN20: 2117 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2118 if (ret) 2119 break; 2120 if (priv->fw_version <= 0x10004) 2121 priv->no_flow_control = true; 2122 break; 2123 default: 2124 break; 2125 } 2126 } 2127 2128 static int cp210x_attach(struct usb_serial *serial) 2129 { 2130 int result; 2131 struct cp210x_serial_private *priv; 2132 2133 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2134 if (!priv) 2135 return -ENOMEM; 2136 2137 usb_set_serial_data(serial, priv); 2138 2139 cp210x_determine_type(serial); 2140 cp210x_init_max_speed(serial); 2141 2142 result = cp210x_gpio_init(serial); 2143 if (result < 0) { 2144 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2145 result); 2146 } 2147 2148 return 0; 2149 } 2150 2151 static void cp210x_disconnect(struct usb_serial *serial) 2152 { 2153 cp210x_gpio_remove(serial); 2154 } 2155 2156 static void cp210x_release(struct usb_serial *serial) 2157 { 2158 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2159 2160 cp210x_gpio_remove(serial); 2161 2162 kfree(priv); 2163 } 2164 2165 module_usb_serial_driver(serial_drivers, id_table); 2166 2167 MODULE_DESCRIPTION(DRIVER_DESC); 2168 MODULE_LICENSE("GPL v2"); 2169