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