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 const struct ktermios *); 35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 36 const 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, 1043 const 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, 1126 const struct ktermios *old_termios) 1127 { 1128 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1129 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1130 struct cp210x_special_chars chars; 1131 struct cp210x_flow_ctl flow_ctl; 1132 u32 flow_repl; 1133 u32 ctl_hs; 1134 bool crtscts; 1135 int ret; 1136 1137 /* 1138 * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum 1139 * CP2102N_E104). Report back that flow control is not supported. 1140 */ 1141 if (priv->no_flow_control) { 1142 tty->termios.c_cflag &= ~CRTSCTS; 1143 tty->termios.c_iflag &= ~(IXON | IXOFF); 1144 } 1145 1146 if (old_termios && 1147 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1148 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1149 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1150 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1151 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1152 return; 1153 } 1154 1155 if (I_IXON(tty) || I_IXOFF(tty)) { 1156 memset(&chars, 0, sizeof(chars)); 1157 1158 chars.bXonChar = START_CHAR(tty); 1159 chars.bXoffChar = STOP_CHAR(tty); 1160 1161 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars, 1162 sizeof(chars)); 1163 if (ret) { 1164 dev_err(&port->dev, "failed to set special chars: %d\n", 1165 ret); 1166 } 1167 } 1168 1169 mutex_lock(&port_priv->mutex); 1170 1171 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1172 sizeof(flow_ctl)); 1173 if (ret) 1174 goto out_unlock; 1175 1176 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1177 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1178 1179 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1180 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1181 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1182 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1183 if (port_priv->dtr) 1184 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1185 else 1186 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1187 1188 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1189 if (C_CRTSCTS(tty)) { 1190 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1191 if (port_priv->rts) 1192 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1193 else 1194 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1195 crtscts = true; 1196 } else { 1197 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1198 if (port_priv->rts) 1199 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1200 else 1201 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1202 crtscts = false; 1203 } 1204 1205 if (I_IXOFF(tty)) { 1206 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1207 1208 flow_ctl.ulXonLimit = cpu_to_le32(128); 1209 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1210 } else { 1211 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1212 } 1213 1214 if (I_IXON(tty)) 1215 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1216 else 1217 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1218 1219 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1220 ctl_hs, flow_repl); 1221 1222 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1223 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1224 1225 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1226 sizeof(flow_ctl)); 1227 if (ret) 1228 goto out_unlock; 1229 1230 port_priv->crtscts = crtscts; 1231 out_unlock: 1232 mutex_unlock(&port_priv->mutex); 1233 } 1234 1235 static void cp210x_set_termios(struct tty_struct *tty, 1236 struct usb_serial_port *port, 1237 const struct ktermios *old_termios) 1238 { 1239 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1240 u16 bits; 1241 int ret; 1242 1243 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1244 return; 1245 1246 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1247 cp210x_change_speed(tty, port, old_termios); 1248 1249 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1250 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1251 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1252 tty->termios.c_cflag |= CS8; 1253 } 1254 1255 bits = 0; 1256 1257 switch (C_CSIZE(tty)) { 1258 case CS5: 1259 bits |= BITS_DATA_5; 1260 break; 1261 case CS6: 1262 bits |= BITS_DATA_6; 1263 break; 1264 case CS7: 1265 bits |= BITS_DATA_7; 1266 break; 1267 case CS8: 1268 default: 1269 bits |= BITS_DATA_8; 1270 break; 1271 } 1272 1273 if (C_PARENB(tty)) { 1274 if (C_CMSPAR(tty)) { 1275 if (C_PARODD(tty)) 1276 bits |= BITS_PARITY_MARK; 1277 else 1278 bits |= BITS_PARITY_SPACE; 1279 } else { 1280 if (C_PARODD(tty)) 1281 bits |= BITS_PARITY_ODD; 1282 else 1283 bits |= BITS_PARITY_EVEN; 1284 } 1285 } 1286 1287 if (C_CSTOPB(tty)) 1288 bits |= BITS_STOP_2; 1289 else 1290 bits |= BITS_STOP_1; 1291 1292 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1293 if (ret) 1294 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1295 1296 cp210x_set_flow_control(tty, port, old_termios); 1297 1298 /* 1299 * Enable event-insertion mode only if input parity checking is 1300 * enabled for now. 1301 */ 1302 if (I_INPCK(tty)) 1303 cp210x_enable_event_mode(port); 1304 else 1305 cp210x_disable_event_mode(port); 1306 } 1307 1308 static int cp210x_tiocmset(struct tty_struct *tty, 1309 unsigned int set, unsigned int clear) 1310 { 1311 struct usb_serial_port *port = tty->driver_data; 1312 return cp210x_tiocmset_port(port, set, clear); 1313 } 1314 1315 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1316 unsigned int set, unsigned int clear) 1317 { 1318 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1319 struct cp210x_flow_ctl flow_ctl; 1320 u32 ctl_hs, flow_repl; 1321 u16 control = 0; 1322 int ret; 1323 1324 mutex_lock(&port_priv->mutex); 1325 1326 if (set & TIOCM_RTS) { 1327 port_priv->rts = true; 1328 control |= CONTROL_RTS; 1329 control |= CONTROL_WRITE_RTS; 1330 } 1331 if (set & TIOCM_DTR) { 1332 port_priv->dtr = true; 1333 control |= CONTROL_DTR; 1334 control |= CONTROL_WRITE_DTR; 1335 } 1336 if (clear & TIOCM_RTS) { 1337 port_priv->rts = false; 1338 control &= ~CONTROL_RTS; 1339 control |= CONTROL_WRITE_RTS; 1340 } 1341 if (clear & TIOCM_DTR) { 1342 port_priv->dtr = false; 1343 control &= ~CONTROL_DTR; 1344 control |= CONTROL_WRITE_DTR; 1345 } 1346 1347 /* 1348 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1349 * flow control is enabled. 1350 */ 1351 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1352 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1353 sizeof(flow_ctl)); 1354 if (ret) 1355 goto out_unlock; 1356 1357 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1358 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1359 1360 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1361 if (port_priv->dtr) 1362 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1363 else 1364 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1365 1366 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1367 if (port_priv->rts) 1368 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1369 else 1370 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1371 1372 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1373 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1374 1375 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1376 __func__, ctl_hs, flow_repl); 1377 1378 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1379 sizeof(flow_ctl)); 1380 } else { 1381 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1382 1383 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1384 } 1385 out_unlock: 1386 mutex_unlock(&port_priv->mutex); 1387 1388 return ret; 1389 } 1390 1391 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1392 { 1393 if (on) 1394 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1395 else 1396 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1397 } 1398 1399 static int cp210x_tiocmget(struct tty_struct *tty) 1400 { 1401 struct usb_serial_port *port = tty->driver_data; 1402 u8 control; 1403 int result; 1404 1405 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1406 if (result) 1407 return result; 1408 1409 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1410 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1411 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1412 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1413 |((control & CONTROL_RING)? TIOCM_RI : 0) 1414 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1415 1416 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1417 1418 return result; 1419 } 1420 1421 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1422 { 1423 struct usb_serial_port *port = tty->driver_data; 1424 u16 state; 1425 1426 if (break_state == 0) 1427 state = BREAK_OFF; 1428 else 1429 state = BREAK_ON; 1430 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1431 state == BREAK_OFF ? "off" : "on"); 1432 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1433 } 1434 1435 #ifdef CONFIG_GPIOLIB 1436 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1437 { 1438 struct usb_serial *serial = gpiochip_get_data(gc); 1439 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1440 u8 req_type; 1441 u16 mask; 1442 int result; 1443 int len; 1444 1445 result = usb_autopm_get_interface(serial->interface); 1446 if (result) 1447 return result; 1448 1449 switch (priv->partnum) { 1450 case CP210X_PARTNUM_CP2105: 1451 req_type = REQTYPE_INTERFACE_TO_HOST; 1452 len = 1; 1453 break; 1454 case CP210X_PARTNUM_CP2108: 1455 req_type = REQTYPE_INTERFACE_TO_HOST; 1456 len = 2; 1457 break; 1458 default: 1459 req_type = REQTYPE_DEVICE_TO_HOST; 1460 len = 1; 1461 break; 1462 } 1463 1464 mask = 0; 1465 result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH, 1466 &mask, len); 1467 1468 usb_autopm_put_interface(serial->interface); 1469 1470 if (result < 0) 1471 return result; 1472 1473 le16_to_cpus(&mask); 1474 1475 return !!(mask & BIT(gpio)); 1476 } 1477 1478 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1479 { 1480 struct usb_serial *serial = gpiochip_get_data(gc); 1481 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1482 struct cp210x_gpio_write16 buf16; 1483 struct cp210x_gpio_write buf; 1484 u16 mask, state; 1485 u16 wIndex; 1486 int result; 1487 1488 if (value == 1) 1489 state = BIT(gpio); 1490 else 1491 state = 0; 1492 1493 mask = BIT(gpio); 1494 1495 result = usb_autopm_get_interface(serial->interface); 1496 if (result) 1497 goto out; 1498 1499 switch (priv->partnum) { 1500 case CP210X_PARTNUM_CP2105: 1501 buf.mask = (u8)mask; 1502 buf.state = (u8)state; 1503 result = cp210x_write_vendor_block(serial, 1504 REQTYPE_HOST_TO_INTERFACE, 1505 CP210X_WRITE_LATCH, &buf, 1506 sizeof(buf)); 1507 break; 1508 case CP210X_PARTNUM_CP2108: 1509 buf16.mask = cpu_to_le16(mask); 1510 buf16.state = cpu_to_le16(state); 1511 result = cp210x_write_vendor_block(serial, 1512 REQTYPE_HOST_TO_INTERFACE, 1513 CP210X_WRITE_LATCH, &buf16, 1514 sizeof(buf16)); 1515 break; 1516 default: 1517 wIndex = state << 8 | mask; 1518 result = usb_control_msg(serial->dev, 1519 usb_sndctrlpipe(serial->dev, 0), 1520 CP210X_VENDOR_SPECIFIC, 1521 REQTYPE_HOST_TO_DEVICE, 1522 CP210X_WRITE_LATCH, 1523 wIndex, 1524 NULL, 0, USB_CTRL_SET_TIMEOUT); 1525 break; 1526 } 1527 1528 usb_autopm_put_interface(serial->interface); 1529 out: 1530 if (result < 0) { 1531 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1532 result); 1533 } 1534 } 1535 1536 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1537 { 1538 struct usb_serial *serial = gpiochip_get_data(gc); 1539 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1540 1541 return priv->gpio_input & BIT(gpio); 1542 } 1543 1544 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1545 { 1546 struct usb_serial *serial = gpiochip_get_data(gc); 1547 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1548 1549 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1550 /* hardware does not support an input mode */ 1551 return -ENOTSUPP; 1552 } 1553 1554 /* push-pull pins cannot be changed to be inputs */ 1555 if (priv->gpio_pushpull & BIT(gpio)) 1556 return -EINVAL; 1557 1558 /* make sure to release pin if it is being driven low */ 1559 cp210x_gpio_set(gc, gpio, 1); 1560 1561 priv->gpio_input |= BIT(gpio); 1562 1563 return 0; 1564 } 1565 1566 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1567 int value) 1568 { 1569 struct usb_serial *serial = gpiochip_get_data(gc); 1570 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1571 1572 priv->gpio_input &= ~BIT(gpio); 1573 cp210x_gpio_set(gc, gpio, value); 1574 1575 return 0; 1576 } 1577 1578 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1579 unsigned long config) 1580 { 1581 struct usb_serial *serial = gpiochip_get_data(gc); 1582 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1583 enum pin_config_param param = pinconf_to_config_param(config); 1584 1585 /* Succeed only if in correct mode (this can't be set at runtime) */ 1586 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1587 (priv->gpio_pushpull & BIT(gpio))) 1588 return 0; 1589 1590 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1591 !(priv->gpio_pushpull & BIT(gpio))) 1592 return 0; 1593 1594 return -ENOTSUPP; 1595 } 1596 1597 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1598 unsigned long *valid_mask, unsigned int ngpios) 1599 { 1600 struct usb_serial *serial = gpiochip_get_data(gc); 1601 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1602 struct device *dev = &serial->interface->dev; 1603 unsigned long altfunc_mask = priv->gpio_altfunc; 1604 1605 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1606 1607 if (bitmap_empty(valid_mask, ngpios)) 1608 dev_dbg(dev, "no pin configured for GPIO\n"); 1609 else 1610 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1611 valid_mask); 1612 return 0; 1613 } 1614 1615 /* 1616 * This function is for configuring GPIO using shared pins, where other signals 1617 * are made unavailable by configuring the use of GPIO. This is believed to be 1618 * only applicable to the cp2105 at this point, the other devices supported by 1619 * this driver that provide GPIO do so in a way that does not impact other 1620 * signals and are thus expected to have very different initialisation. 1621 */ 1622 static int cp2105_gpioconf_init(struct usb_serial *serial) 1623 { 1624 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1625 struct cp210x_pin_mode mode; 1626 struct cp210x_dual_port_config config; 1627 u8 intf_num = cp210x_interface_num(serial); 1628 u8 iface_config; 1629 int result; 1630 1631 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1632 CP210X_GET_DEVICEMODE, &mode, 1633 sizeof(mode)); 1634 if (result < 0) 1635 return result; 1636 1637 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1638 CP210X_GET_PORTCONFIG, &config, 1639 sizeof(config)); 1640 if (result < 0) 1641 return result; 1642 1643 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1644 if (intf_num == 0) { 1645 priv->gc.ngpio = 2; 1646 1647 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1648 /* mark all GPIOs of this interface as reserved */ 1649 priv->gpio_altfunc = 0xff; 1650 return 0; 1651 } 1652 1653 iface_config = config.eci_cfg; 1654 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1655 CP210X_ECI_GPIO_MODE_MASK) >> 1656 CP210X_ECI_GPIO_MODE_OFFSET); 1657 } else if (intf_num == 1) { 1658 priv->gc.ngpio = 3; 1659 1660 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1661 /* mark all GPIOs of this interface as reserved */ 1662 priv->gpio_altfunc = 0xff; 1663 return 0; 1664 } 1665 1666 iface_config = config.sci_cfg; 1667 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1668 CP210X_SCI_GPIO_MODE_MASK) >> 1669 CP210X_SCI_GPIO_MODE_OFFSET); 1670 } else { 1671 return -ENODEV; 1672 } 1673 1674 /* mark all pins which are not in GPIO mode */ 1675 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1676 priv->gpio_altfunc |= BIT(0); 1677 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1678 CP2105_GPIO1_RS485_MODE)) 1679 priv->gpio_altfunc |= BIT(1); 1680 1681 /* driver implementation for CP2105 only supports outputs */ 1682 priv->gpio_input = 0; 1683 1684 return 0; 1685 } 1686 1687 static int cp2104_gpioconf_init(struct usb_serial *serial) 1688 { 1689 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1690 struct cp210x_single_port_config config; 1691 u8 iface_config; 1692 u8 gpio_latch; 1693 int result; 1694 u8 i; 1695 1696 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1697 CP210X_GET_PORTCONFIG, &config, 1698 sizeof(config)); 1699 if (result < 0) 1700 return result; 1701 1702 priv->gc.ngpio = 4; 1703 1704 iface_config = config.device_cfg; 1705 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1706 CP210X_GPIO_MODE_MASK) >> 1707 CP210X_GPIO_MODE_OFFSET); 1708 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1709 CP210X_GPIO_MODE_MASK) >> 1710 CP210X_GPIO_MODE_OFFSET); 1711 1712 /* mark all pins which are not in GPIO mode */ 1713 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1714 priv->gpio_altfunc |= BIT(0); 1715 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1716 priv->gpio_altfunc |= BIT(1); 1717 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1718 priv->gpio_altfunc |= BIT(2); 1719 1720 /* 1721 * Like CP2102N, CP2104 has also no strict input and output pin 1722 * modes. 1723 * Do the same input mode emulation as CP2102N. 1724 */ 1725 for (i = 0; i < priv->gc.ngpio; ++i) { 1726 /* 1727 * Set direction to "input" iff pin is open-drain and reset 1728 * value is 1. 1729 */ 1730 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1731 priv->gpio_input |= BIT(i); 1732 } 1733 1734 return 0; 1735 } 1736 1737 static int cp2108_gpio_init(struct usb_serial *serial) 1738 { 1739 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1740 struct cp210x_quad_port_config config; 1741 u16 gpio_latch; 1742 int result; 1743 u8 i; 1744 1745 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1746 CP210X_GET_PORTCONFIG, &config, 1747 sizeof(config)); 1748 if (result < 0) 1749 return result; 1750 1751 priv->gc.ngpio = 16; 1752 priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1); 1753 gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1); 1754 1755 /* 1756 * Mark all pins which are not in GPIO mode. 1757 * 1758 * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet: 1759 * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf 1760 * 1761 * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0] 1762 * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7, 1763 * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15. 1764 */ 1765 for (i = 0; i < 4; i++) { 1766 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED) 1767 priv->gpio_altfunc |= BIT(i * 4); 1768 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED) 1769 priv->gpio_altfunc |= BIT((i * 4) + 1); 1770 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485) 1771 priv->gpio_altfunc |= BIT((i * 4) + 2); 1772 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK) 1773 priv->gpio_altfunc |= BIT((i * 4) + 3); 1774 } 1775 1776 /* 1777 * Like CP2102N, CP2108 has also no strict input and output pin 1778 * modes. Do the same input mode emulation as CP2102N. 1779 */ 1780 for (i = 0; i < priv->gc.ngpio; ++i) { 1781 /* 1782 * Set direction to "input" iff pin is open-drain and reset 1783 * value is 1. 1784 */ 1785 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1786 priv->gpio_input |= BIT(i); 1787 } 1788 1789 return 0; 1790 } 1791 1792 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1793 { 1794 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1795 const u16 config_size = 0x02a6; 1796 u8 gpio_rst_latch; 1797 u8 config_version; 1798 u8 gpio_pushpull; 1799 u8 *config_buf; 1800 u8 gpio_latch; 1801 u8 gpio_ctrl; 1802 int result; 1803 u8 i; 1804 1805 /* 1806 * Retrieve device configuration from the device. 1807 * The array received contains all customization settings done at the 1808 * factory/manufacturer. Format of the array is documented at the 1809 * time of writing at: 1810 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1811 */ 1812 config_buf = kmalloc(config_size, GFP_KERNEL); 1813 if (!config_buf) 1814 return -ENOMEM; 1815 1816 result = cp210x_read_vendor_block(serial, 1817 REQTYPE_DEVICE_TO_HOST, 1818 CP210X_READ_2NCONFIG, 1819 config_buf, 1820 config_size); 1821 if (result < 0) { 1822 kfree(config_buf); 1823 return result; 1824 } 1825 1826 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1827 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1828 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1829 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1830 1831 kfree(config_buf); 1832 1833 /* Make sure this is a config format we understand. */ 1834 if (config_version != 0x01) 1835 return -ENOTSUPP; 1836 1837 priv->gc.ngpio = 4; 1838 1839 /* 1840 * Get default pin states after reset. Needed so we can determine 1841 * the direction of an open-drain pin. 1842 */ 1843 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1844 1845 /* 0 indicates open-drain mode, 1 is push-pull */ 1846 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1847 1848 /* 0 indicates GPIO mode, 1 is alternate function */ 1849 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1850 /* QFN20 is special... */ 1851 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1852 priv->gpio_altfunc |= BIT(0); 1853 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1854 priv->gpio_altfunc |= BIT(1); 1855 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1856 priv->gpio_altfunc |= BIT(2); 1857 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1858 priv->gpio_altfunc |= BIT(3); 1859 } else { 1860 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1861 } 1862 1863 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1864 /* 1865 * For the QFN28 package, GPIO4-6 are controlled by 1866 * the low three bits of the mode/latch fields. 1867 * Contrary to the document linked above, the bits for 1868 * the SUSPEND pins are elsewhere. No alternate 1869 * function is available for these pins. 1870 */ 1871 priv->gc.ngpio = 7; 1872 gpio_latch |= (gpio_rst_latch & 7) << 4; 1873 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1874 } 1875 1876 /* 1877 * The CP2102N does not strictly has input and output pin modes, 1878 * it only knows open-drain and push-pull modes which is set at 1879 * factory. An open-drain pin can function both as an 1880 * input or an output. We emulate input mode for open-drain pins 1881 * by making sure they are not driven low, and we do not allow 1882 * push-pull pins to be set as an input. 1883 */ 1884 for (i = 0; i < priv->gc.ngpio; ++i) { 1885 /* 1886 * Set direction to "input" iff pin is open-drain and reset 1887 * value is 1. 1888 */ 1889 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1890 priv->gpio_input |= BIT(i); 1891 } 1892 1893 return 0; 1894 } 1895 1896 static int cp210x_gpio_init(struct usb_serial *serial) 1897 { 1898 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1899 int result; 1900 1901 switch (priv->partnum) { 1902 case CP210X_PARTNUM_CP2104: 1903 result = cp2104_gpioconf_init(serial); 1904 break; 1905 case CP210X_PARTNUM_CP2105: 1906 result = cp2105_gpioconf_init(serial); 1907 break; 1908 case CP210X_PARTNUM_CP2108: 1909 /* 1910 * The GPIOs are not tied to any specific port so only register 1911 * once for interface 0. 1912 */ 1913 if (cp210x_interface_num(serial) != 0) 1914 return 0; 1915 result = cp2108_gpio_init(serial); 1916 break; 1917 case CP210X_PARTNUM_CP2102N_QFN28: 1918 case CP210X_PARTNUM_CP2102N_QFN24: 1919 case CP210X_PARTNUM_CP2102N_QFN20: 1920 result = cp2102n_gpioconf_init(serial); 1921 break; 1922 default: 1923 return 0; 1924 } 1925 1926 if (result < 0) 1927 return result; 1928 1929 priv->gc.label = "cp210x"; 1930 priv->gc.get_direction = cp210x_gpio_direction_get; 1931 priv->gc.direction_input = cp210x_gpio_direction_input; 1932 priv->gc.direction_output = cp210x_gpio_direction_output; 1933 priv->gc.get = cp210x_gpio_get; 1934 priv->gc.set = cp210x_gpio_set; 1935 priv->gc.set_config = cp210x_gpio_set_config; 1936 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1937 priv->gc.owner = THIS_MODULE; 1938 priv->gc.parent = &serial->interface->dev; 1939 priv->gc.base = -1; 1940 priv->gc.can_sleep = true; 1941 1942 result = gpiochip_add_data(&priv->gc, serial); 1943 if (!result) 1944 priv->gpio_registered = true; 1945 1946 return result; 1947 } 1948 1949 static void cp210x_gpio_remove(struct usb_serial *serial) 1950 { 1951 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1952 1953 if (priv->gpio_registered) { 1954 gpiochip_remove(&priv->gc); 1955 priv->gpio_registered = false; 1956 } 1957 } 1958 1959 #else 1960 1961 static int cp210x_gpio_init(struct usb_serial *serial) 1962 { 1963 return 0; 1964 } 1965 1966 static void cp210x_gpio_remove(struct usb_serial *serial) 1967 { 1968 /* Nothing to do */ 1969 } 1970 1971 #endif 1972 1973 static int cp210x_port_probe(struct usb_serial_port *port) 1974 { 1975 struct usb_serial *serial = port->serial; 1976 struct cp210x_port_private *port_priv; 1977 1978 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1979 if (!port_priv) 1980 return -ENOMEM; 1981 1982 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1983 mutex_init(&port_priv->mutex); 1984 1985 usb_set_serial_port_data(port, port_priv); 1986 1987 return 0; 1988 } 1989 1990 static void cp210x_port_remove(struct usb_serial_port *port) 1991 { 1992 struct cp210x_port_private *port_priv; 1993 1994 port_priv = usb_get_serial_port_data(port); 1995 kfree(port_priv); 1996 } 1997 1998 static void cp210x_init_max_speed(struct usb_serial *serial) 1999 { 2000 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2001 bool use_actual_rate = false; 2002 speed_t min = 300; 2003 speed_t max; 2004 2005 switch (priv->partnum) { 2006 case CP210X_PARTNUM_CP2101: 2007 max = 921600; 2008 break; 2009 case CP210X_PARTNUM_CP2102: 2010 case CP210X_PARTNUM_CP2103: 2011 max = 1000000; 2012 break; 2013 case CP210X_PARTNUM_CP2104: 2014 use_actual_rate = true; 2015 max = 2000000; 2016 break; 2017 case CP210X_PARTNUM_CP2108: 2018 max = 2000000; 2019 break; 2020 case CP210X_PARTNUM_CP2105: 2021 if (cp210x_interface_num(serial) == 0) { 2022 use_actual_rate = true; 2023 max = 2000000; /* ECI */ 2024 } else { 2025 min = 2400; 2026 max = 921600; /* SCI */ 2027 } 2028 break; 2029 case CP210X_PARTNUM_CP2102N_QFN28: 2030 case CP210X_PARTNUM_CP2102N_QFN24: 2031 case CP210X_PARTNUM_CP2102N_QFN20: 2032 use_actual_rate = true; 2033 max = 3000000; 2034 break; 2035 default: 2036 max = 2000000; 2037 break; 2038 } 2039 2040 priv->min_speed = min; 2041 priv->max_speed = max; 2042 priv->use_actual_rate = use_actual_rate; 2043 } 2044 2045 static void cp2102_determine_quirks(struct usb_serial *serial) 2046 { 2047 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2048 u8 *buf; 2049 int ret; 2050 2051 buf = kmalloc(2, GFP_KERNEL); 2052 if (!buf) 2053 return; 2054 /* 2055 * Some (possibly counterfeit) CP2102 do not support event-insertion 2056 * mode and respond differently to malformed vendor requests. 2057 * Specifically, they return one instead of two bytes when sent a 2058 * two-byte part-number request. 2059 */ 2060 ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 2061 CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST, 2062 CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT); 2063 if (ret == 1) { 2064 dev_dbg(&serial->interface->dev, 2065 "device does not support event-insertion mode\n"); 2066 priv->no_event_mode = true; 2067 } 2068 2069 kfree(buf); 2070 } 2071 2072 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value) 2073 { 2074 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2075 u8 ver[3]; 2076 int ret; 2077 2078 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value, 2079 ver, sizeof(ver)); 2080 if (ret) 2081 return ret; 2082 2083 dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__, 2084 ver[0], ver[1], ver[2]); 2085 2086 priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2]; 2087 2088 return 0; 2089 } 2090 2091 static void cp210x_determine_type(struct usb_serial *serial) 2092 { 2093 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2094 int ret; 2095 2096 ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 2097 CP210X_GET_PARTNUM, &priv->partnum, 2098 sizeof(priv->partnum)); 2099 if (ret < 0) { 2100 dev_warn(&serial->interface->dev, 2101 "querying part number failed\n"); 2102 priv->partnum = CP210X_PARTNUM_UNKNOWN; 2103 return; 2104 } 2105 2106 dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum); 2107 2108 switch (priv->partnum) { 2109 case CP210X_PARTNUM_CP2102: 2110 cp2102_determine_quirks(serial); 2111 break; 2112 case CP210X_PARTNUM_CP2105: 2113 case CP210X_PARTNUM_CP2108: 2114 cp210x_get_fw_version(serial, CP210X_GET_FW_VER); 2115 break; 2116 case CP210X_PARTNUM_CP2102N_QFN28: 2117 case CP210X_PARTNUM_CP2102N_QFN24: 2118 case CP210X_PARTNUM_CP2102N_QFN20: 2119 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N); 2120 if (ret) 2121 break; 2122 if (priv->fw_version <= 0x10004) 2123 priv->no_flow_control = true; 2124 break; 2125 default: 2126 break; 2127 } 2128 } 2129 2130 static int cp210x_attach(struct usb_serial *serial) 2131 { 2132 int result; 2133 struct cp210x_serial_private *priv; 2134 2135 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2136 if (!priv) 2137 return -ENOMEM; 2138 2139 usb_set_serial_data(serial, priv); 2140 2141 cp210x_determine_type(serial); 2142 cp210x_init_max_speed(serial); 2143 2144 result = cp210x_gpio_init(serial); 2145 if (result < 0) { 2146 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 2147 result); 2148 } 2149 2150 return 0; 2151 } 2152 2153 static void cp210x_disconnect(struct usb_serial *serial) 2154 { 2155 cp210x_gpio_remove(serial); 2156 } 2157 2158 static void cp210x_release(struct usb_serial *serial) 2159 { 2160 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 2161 2162 cp210x_gpio_remove(serial); 2163 2164 kfree(priv); 2165 } 2166 2167 module_usb_serial_driver(serial_drivers, id_table); 2168 2169 MODULE_DESCRIPTION(DRIVER_DESC); 2170 MODULE_LICENSE("GPL v2"); 2171