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(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 55 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 56 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 57 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 59 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 60 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 61 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 62 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 63 { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */ 64 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 83 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 131 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 132 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 133 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 134 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 135 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 136 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 137 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 138 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 139 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 140 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 141 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 142 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 143 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 144 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 145 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 146 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 147 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 149 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 151 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 152 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 153 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 154 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 155 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 156 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 157 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 158 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 159 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 160 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 161 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 162 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 164 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 165 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 166 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 167 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 168 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 169 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 170 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 171 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 172 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 173 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 174 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 175 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 176 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 177 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 178 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 179 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 180 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 181 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 182 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 183 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 184 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 185 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 186 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 187 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 188 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 189 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 191 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 192 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 193 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 194 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 195 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 196 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 197 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 198 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 199 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 200 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 201 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 202 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 203 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 204 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 205 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 206 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 207 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 208 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 209 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 210 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 211 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 212 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 213 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 214 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 215 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 216 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 217 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 218 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 219 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 220 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 221 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 222 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 228 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 229 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 230 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 231 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 232 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 233 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 234 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 235 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 236 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 237 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 238 { } /* Terminating Entry */ 239 }; 240 241 MODULE_DEVICE_TABLE(usb, id_table); 242 243 struct cp210x_serial_private { 244 #ifdef CONFIG_GPIOLIB 245 struct gpio_chip gc; 246 bool gpio_registered; 247 u8 gpio_pushpull; 248 u8 gpio_altfunc; 249 u8 gpio_input; 250 #endif 251 u8 partnum; 252 speed_t min_speed; 253 speed_t max_speed; 254 bool use_actual_rate; 255 }; 256 257 enum cp210x_event_state { 258 ES_DATA, 259 ES_ESCAPE, 260 ES_LSR, 261 ES_LSR_DATA_0, 262 ES_LSR_DATA_1, 263 ES_MSR 264 }; 265 266 struct cp210x_port_private { 267 u8 bInterfaceNumber; 268 bool event_mode; 269 enum cp210x_event_state event_state; 270 u8 lsr; 271 272 struct mutex mutex; 273 bool crtscts; 274 bool dtr; 275 bool rts; 276 }; 277 278 static struct usb_serial_driver cp210x_device = { 279 .driver = { 280 .owner = THIS_MODULE, 281 .name = "cp210x", 282 }, 283 .id_table = id_table, 284 .num_ports = 1, 285 .bulk_in_size = 256, 286 .bulk_out_size = 256, 287 .open = cp210x_open, 288 .close = cp210x_close, 289 .break_ctl = cp210x_break_ctl, 290 .set_termios = cp210x_set_termios, 291 .tx_empty = cp210x_tx_empty, 292 .throttle = usb_serial_generic_throttle, 293 .unthrottle = usb_serial_generic_unthrottle, 294 .tiocmget = cp210x_tiocmget, 295 .tiocmset = cp210x_tiocmset, 296 .get_icount = usb_serial_generic_get_icount, 297 .attach = cp210x_attach, 298 .disconnect = cp210x_disconnect, 299 .release = cp210x_release, 300 .port_probe = cp210x_port_probe, 301 .port_remove = cp210x_port_remove, 302 .dtr_rts = cp210x_dtr_rts, 303 .process_read_urb = cp210x_process_read_urb, 304 }; 305 306 static struct usb_serial_driver * const serial_drivers[] = { 307 &cp210x_device, NULL 308 }; 309 310 /* Config request types */ 311 #define REQTYPE_HOST_TO_INTERFACE 0x41 312 #define REQTYPE_INTERFACE_TO_HOST 0xc1 313 #define REQTYPE_HOST_TO_DEVICE 0x40 314 #define REQTYPE_DEVICE_TO_HOST 0xc0 315 316 /* Config request codes */ 317 #define CP210X_IFC_ENABLE 0x00 318 #define CP210X_SET_BAUDDIV 0x01 319 #define CP210X_GET_BAUDDIV 0x02 320 #define CP210X_SET_LINE_CTL 0x03 321 #define CP210X_GET_LINE_CTL 0x04 322 #define CP210X_SET_BREAK 0x05 323 #define CP210X_IMM_CHAR 0x06 324 #define CP210X_SET_MHS 0x07 325 #define CP210X_GET_MDMSTS 0x08 326 #define CP210X_SET_XON 0x09 327 #define CP210X_SET_XOFF 0x0A 328 #define CP210X_SET_EVENTMASK 0x0B 329 #define CP210X_GET_EVENTMASK 0x0C 330 #define CP210X_SET_CHAR 0x0D 331 #define CP210X_GET_CHARS 0x0E 332 #define CP210X_GET_PROPS 0x0F 333 #define CP210X_GET_COMM_STATUS 0x10 334 #define CP210X_RESET 0x11 335 #define CP210X_PURGE 0x12 336 #define CP210X_SET_FLOW 0x13 337 #define CP210X_GET_FLOW 0x14 338 #define CP210X_EMBED_EVENTS 0x15 339 #define CP210X_GET_EVENTSTATE 0x16 340 #define CP210X_SET_CHARS 0x19 341 #define CP210X_GET_BAUDRATE 0x1D 342 #define CP210X_SET_BAUDRATE 0x1E 343 #define CP210X_VENDOR_SPECIFIC 0xFF 344 345 /* CP210X_IFC_ENABLE */ 346 #define UART_ENABLE 0x0001 347 #define UART_DISABLE 0x0000 348 349 /* CP210X_(SET|GET)_BAUDDIV */ 350 #define BAUD_RATE_GEN_FREQ 0x384000 351 352 /* CP210X_(SET|GET)_LINE_CTL */ 353 #define BITS_DATA_MASK 0X0f00 354 #define BITS_DATA_5 0X0500 355 #define BITS_DATA_6 0X0600 356 #define BITS_DATA_7 0X0700 357 #define BITS_DATA_8 0X0800 358 #define BITS_DATA_9 0X0900 359 360 #define BITS_PARITY_MASK 0x00f0 361 #define BITS_PARITY_NONE 0x0000 362 #define BITS_PARITY_ODD 0x0010 363 #define BITS_PARITY_EVEN 0x0020 364 #define BITS_PARITY_MARK 0x0030 365 #define BITS_PARITY_SPACE 0x0040 366 367 #define BITS_STOP_MASK 0x000f 368 #define BITS_STOP_1 0x0000 369 #define BITS_STOP_1_5 0x0001 370 #define BITS_STOP_2 0x0002 371 372 /* CP210X_SET_BREAK */ 373 #define BREAK_ON 0x0001 374 #define BREAK_OFF 0x0000 375 376 /* CP210X_(SET_MHS|GET_MDMSTS) */ 377 #define CONTROL_DTR 0x0001 378 #define CONTROL_RTS 0x0002 379 #define CONTROL_CTS 0x0010 380 #define CONTROL_DSR 0x0020 381 #define CONTROL_RING 0x0040 382 #define CONTROL_DCD 0x0080 383 #define CONTROL_WRITE_DTR 0x0100 384 #define CONTROL_WRITE_RTS 0x0200 385 386 /* CP210X_(GET|SET)_CHARS */ 387 struct cp210x_special_chars { 388 u8 bEofChar; 389 u8 bErrorChar; 390 u8 bBreakChar; 391 u8 bEventChar; 392 u8 bXonChar; 393 u8 bXoffChar; 394 }; 395 396 /* CP210X_VENDOR_SPECIFIC values */ 397 #define CP210X_READ_2NCONFIG 0x000E 398 #define CP210X_READ_LATCH 0x00C2 399 #define CP210X_GET_PARTNUM 0x370B 400 #define CP210X_GET_PORTCONFIG 0x370C 401 #define CP210X_GET_DEVICEMODE 0x3711 402 #define CP210X_WRITE_LATCH 0x37E1 403 404 /* Part number definitions */ 405 #define CP210X_PARTNUM_CP2101 0x01 406 #define CP210X_PARTNUM_CP2102 0x02 407 #define CP210X_PARTNUM_CP2103 0x03 408 #define CP210X_PARTNUM_CP2104 0x04 409 #define CP210X_PARTNUM_CP2105 0x05 410 #define CP210X_PARTNUM_CP2108 0x08 411 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 412 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 413 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 414 #define CP210X_PARTNUM_UNKNOWN 0xFF 415 416 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 417 struct cp210x_comm_status { 418 __le32 ulErrors; 419 __le32 ulHoldReasons; 420 __le32 ulAmountInInQueue; 421 __le32 ulAmountInOutQueue; 422 u8 bEofReceived; 423 u8 bWaitForImmediate; 424 u8 bReserved; 425 } __packed; 426 427 /* 428 * CP210X_PURGE - 16 bits passed in wValue of USB request. 429 * SiLabs app note AN571 gives a strange description of the 4 bits: 430 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 431 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 432 */ 433 #define PURGE_ALL 0x000f 434 435 /* CP210X_EMBED_EVENTS */ 436 #define CP210X_ESCCHAR 0xec 437 438 #define CP210X_LSR_OVERRUN BIT(1) 439 #define CP210X_LSR_PARITY BIT(2) 440 #define CP210X_LSR_FRAME BIT(3) 441 #define CP210X_LSR_BREAK BIT(4) 442 443 444 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 445 struct cp210x_flow_ctl { 446 __le32 ulControlHandshake; 447 __le32 ulFlowReplace; 448 __le32 ulXonLimit; 449 __le32 ulXoffLimit; 450 }; 451 452 /* cp210x_flow_ctl::ulControlHandshake */ 453 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 454 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 455 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 456 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 457 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 458 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 459 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 460 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 461 462 /* cp210x_flow_ctl::ulFlowReplace */ 463 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 464 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 465 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 466 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 467 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 468 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 469 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 470 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 471 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 472 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 473 474 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 475 struct cp210x_pin_mode { 476 u8 eci; 477 u8 sci; 478 }; 479 480 #define CP210X_PIN_MODE_MODEM 0 481 #define CP210X_PIN_MODE_GPIO BIT(0) 482 483 /* 484 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 485 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 486 */ 487 struct cp210x_dual_port_config { 488 __le16 gpio_mode; 489 u8 __pad0[2]; 490 __le16 reset_state; 491 u8 __pad1[4]; 492 __le16 suspend_state; 493 u8 sci_cfg; 494 u8 eci_cfg; 495 u8 device_cfg; 496 } __packed; 497 498 /* 499 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 500 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 501 */ 502 struct cp210x_single_port_config { 503 __le16 gpio_mode; 504 u8 __pad0[2]; 505 __le16 reset_state; 506 u8 __pad1[4]; 507 __le16 suspend_state; 508 u8 device_cfg; 509 } __packed; 510 511 /* GPIO modes */ 512 #define CP210X_SCI_GPIO_MODE_OFFSET 9 513 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 514 515 #define CP210X_ECI_GPIO_MODE_OFFSET 2 516 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 517 518 #define CP210X_GPIO_MODE_OFFSET 8 519 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 520 521 /* CP2105 port configuration values */ 522 #define CP2105_GPIO0_TXLED_MODE BIT(0) 523 #define CP2105_GPIO1_RXLED_MODE BIT(1) 524 #define CP2105_GPIO1_RS485_MODE BIT(2) 525 526 /* CP2104 port configuration values */ 527 #define CP2104_GPIO0_TXLED_MODE BIT(0) 528 #define CP2104_GPIO1_RXLED_MODE BIT(1) 529 #define CP2104_GPIO2_RS485_MODE BIT(2) 530 531 /* CP2102N configuration array indices */ 532 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 533 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 534 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 535 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 536 537 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 538 struct cp210x_gpio_write { 539 u8 mask; 540 u8 state; 541 }; 542 543 /* 544 * Helper to get interface number when we only have struct usb_serial. 545 */ 546 static u8 cp210x_interface_num(struct usb_serial *serial) 547 { 548 struct usb_host_interface *cur_altsetting; 549 550 cur_altsetting = serial->interface->cur_altsetting; 551 552 return cur_altsetting->desc.bInterfaceNumber; 553 } 554 555 /* 556 * Reads a variable-sized block of CP210X_ registers, identified by req. 557 * Returns data into buf in native USB byte order. 558 */ 559 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 560 void *buf, int bufsize) 561 { 562 struct usb_serial *serial = port->serial; 563 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 564 void *dmabuf; 565 int result; 566 567 dmabuf = kmalloc(bufsize, GFP_KERNEL); 568 if (!dmabuf) 569 return -ENOMEM; 570 571 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 572 req, REQTYPE_INTERFACE_TO_HOST, 0, 573 port_priv->bInterfaceNumber, dmabuf, bufsize, 574 USB_CTRL_SET_TIMEOUT); 575 if (result == bufsize) { 576 memcpy(buf, dmabuf, bufsize); 577 result = 0; 578 } else { 579 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 580 req, bufsize, result); 581 if (result >= 0) 582 result = -EIO; 583 } 584 585 kfree(dmabuf); 586 587 return result; 588 } 589 590 /* 591 * Reads any 8-bit CP210X_ register identified by req. 592 */ 593 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 594 { 595 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 596 } 597 598 /* 599 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 600 * Returns data into buf in native USB byte order. 601 */ 602 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 603 void *buf, int bufsize) 604 { 605 void *dmabuf; 606 int result; 607 608 dmabuf = kmalloc(bufsize, GFP_KERNEL); 609 if (!dmabuf) 610 return -ENOMEM; 611 612 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 613 CP210X_VENDOR_SPECIFIC, type, val, 614 cp210x_interface_num(serial), dmabuf, bufsize, 615 USB_CTRL_GET_TIMEOUT); 616 if (result == bufsize) { 617 memcpy(buf, dmabuf, bufsize); 618 result = 0; 619 } else { 620 dev_err(&serial->interface->dev, 621 "failed to get vendor val 0x%04x size %d: %d\n", val, 622 bufsize, result); 623 if (result >= 0) 624 result = -EIO; 625 } 626 627 kfree(dmabuf); 628 629 return result; 630 } 631 632 /* 633 * Writes any 16-bit CP210X_ register (req) whose value is passed 634 * entirely in the wValue field of the USB request. 635 */ 636 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 637 { 638 struct usb_serial *serial = port->serial; 639 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 640 int result; 641 642 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 643 req, REQTYPE_HOST_TO_INTERFACE, val, 644 port_priv->bInterfaceNumber, NULL, 0, 645 USB_CTRL_SET_TIMEOUT); 646 if (result < 0) { 647 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 648 req, result); 649 } 650 651 return result; 652 } 653 654 /* 655 * Writes a variable-sized block of CP210X_ registers, identified by req. 656 * Data in buf must be in native USB byte order. 657 */ 658 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 659 void *buf, int bufsize) 660 { 661 struct usb_serial *serial = port->serial; 662 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 663 void *dmabuf; 664 int result; 665 666 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 667 if (!dmabuf) 668 return -ENOMEM; 669 670 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 671 req, REQTYPE_HOST_TO_INTERFACE, 0, 672 port_priv->bInterfaceNumber, dmabuf, bufsize, 673 USB_CTRL_SET_TIMEOUT); 674 675 kfree(dmabuf); 676 677 if (result < 0) { 678 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 679 req, bufsize, result); 680 return result; 681 } 682 683 return 0; 684 } 685 686 /* 687 * Writes any 32-bit CP210X_ register identified by req. 688 */ 689 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 690 { 691 __le32 le32_val; 692 693 le32_val = cpu_to_le32(val); 694 695 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 696 } 697 698 #ifdef CONFIG_GPIOLIB 699 /* 700 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 701 * Data in buf must be in native USB byte order. 702 */ 703 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 704 u16 val, void *buf, int bufsize) 705 { 706 void *dmabuf; 707 int result; 708 709 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 710 if (!dmabuf) 711 return -ENOMEM; 712 713 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 714 CP210X_VENDOR_SPECIFIC, type, val, 715 cp210x_interface_num(serial), dmabuf, bufsize, 716 USB_CTRL_SET_TIMEOUT); 717 718 kfree(dmabuf); 719 720 if (result < 0) { 721 dev_err(&serial->interface->dev, 722 "failed to set vendor val 0x%04x size %d: %d\n", val, 723 bufsize, result); 724 return result; 725 } 726 727 return 0; 728 } 729 #endif 730 731 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 732 { 733 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 734 int result; 735 736 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 737 if (result) { 738 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 739 return result; 740 } 741 742 if (tty) 743 cp210x_set_termios(tty, port, NULL); 744 745 result = usb_serial_generic_open(tty, port); 746 if (result) 747 goto err_disable; 748 749 return 0; 750 751 err_disable: 752 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 753 port_priv->event_mode = false; 754 755 return result; 756 } 757 758 static void cp210x_close(struct usb_serial_port *port) 759 { 760 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 761 762 usb_serial_generic_close(port); 763 764 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 765 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 766 767 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 768 769 /* Disabling the interface disables event-insertion mode. */ 770 port_priv->event_mode = false; 771 } 772 773 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 774 { 775 if (lsr & CP210X_LSR_BREAK) { 776 port->icount.brk++; 777 *flag = TTY_BREAK; 778 } else if (lsr & CP210X_LSR_PARITY) { 779 port->icount.parity++; 780 *flag = TTY_PARITY; 781 } else if (lsr & CP210X_LSR_FRAME) { 782 port->icount.frame++; 783 *flag = TTY_FRAME; 784 } 785 786 if (lsr & CP210X_LSR_OVERRUN) { 787 port->icount.overrun++; 788 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 789 } 790 } 791 792 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 793 { 794 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 795 796 switch (port_priv->event_state) { 797 case ES_DATA: 798 if (*ch == CP210X_ESCCHAR) { 799 port_priv->event_state = ES_ESCAPE; 800 break; 801 } 802 return false; 803 case ES_ESCAPE: 804 switch (*ch) { 805 case 0: 806 dev_dbg(&port->dev, "%s - escape char\n", __func__); 807 *ch = CP210X_ESCCHAR; 808 port_priv->event_state = ES_DATA; 809 return false; 810 case 1: 811 port_priv->event_state = ES_LSR_DATA_0; 812 break; 813 case 2: 814 port_priv->event_state = ES_LSR; 815 break; 816 case 3: 817 port_priv->event_state = ES_MSR; 818 break; 819 default: 820 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 821 port_priv->event_state = ES_DATA; 822 break; 823 } 824 break; 825 case ES_LSR_DATA_0: 826 port_priv->lsr = *ch; 827 port_priv->event_state = ES_LSR_DATA_1; 828 break; 829 case ES_LSR_DATA_1: 830 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 831 __func__, port_priv->lsr, *ch); 832 cp210x_process_lsr(port, port_priv->lsr, flag); 833 port_priv->event_state = ES_DATA; 834 return false; 835 case ES_LSR: 836 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 837 port_priv->lsr = *ch; 838 cp210x_process_lsr(port, port_priv->lsr, flag); 839 port_priv->event_state = ES_DATA; 840 break; 841 case ES_MSR: 842 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 843 /* unimplemented */ 844 port_priv->event_state = ES_DATA; 845 break; 846 } 847 848 return true; 849 } 850 851 static void cp210x_process_read_urb(struct urb *urb) 852 { 853 struct usb_serial_port *port = urb->context; 854 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 855 unsigned char *ch = urb->transfer_buffer; 856 char flag; 857 int i; 858 859 if (!urb->actual_length) 860 return; 861 862 if (port_priv->event_mode) { 863 for (i = 0; i < urb->actual_length; i++, ch++) { 864 flag = TTY_NORMAL; 865 866 if (cp210x_process_char(port, ch, &flag)) 867 continue; 868 869 tty_insert_flip_char(&port->port, *ch, flag); 870 } 871 } else { 872 tty_insert_flip_string(&port->port, ch, urb->actual_length); 873 } 874 tty_flip_buffer_push(&port->port); 875 } 876 877 /* 878 * Read how many bytes are waiting in the TX queue. 879 */ 880 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 881 u32 *count) 882 { 883 struct usb_serial *serial = port->serial; 884 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 885 struct cp210x_comm_status *sts; 886 int result; 887 888 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 889 if (!sts) 890 return -ENOMEM; 891 892 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 893 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 894 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 895 USB_CTRL_GET_TIMEOUT); 896 if (result == sizeof(*sts)) { 897 *count = le32_to_cpu(sts->ulAmountInOutQueue); 898 result = 0; 899 } else { 900 dev_err(&port->dev, "failed to get comm status: %d\n", result); 901 if (result >= 0) 902 result = -EIO; 903 } 904 905 kfree(sts); 906 907 return result; 908 } 909 910 static bool cp210x_tx_empty(struct usb_serial_port *port) 911 { 912 int err; 913 u32 count; 914 915 err = cp210x_get_tx_queue_byte_count(port, &count); 916 if (err) 917 return true; 918 919 return !count; 920 } 921 922 struct cp210x_rate { 923 speed_t rate; 924 speed_t high; 925 }; 926 927 static const struct cp210x_rate cp210x_an205_table1[] = { 928 { 300, 300 }, 929 { 600, 600 }, 930 { 1200, 1200 }, 931 { 1800, 1800 }, 932 { 2400, 2400 }, 933 { 4000, 4000 }, 934 { 4800, 4803 }, 935 { 7200, 7207 }, 936 { 9600, 9612 }, 937 { 14400, 14428 }, 938 { 16000, 16062 }, 939 { 19200, 19250 }, 940 { 28800, 28912 }, 941 { 38400, 38601 }, 942 { 51200, 51558 }, 943 { 56000, 56280 }, 944 { 57600, 58053 }, 945 { 64000, 64111 }, 946 { 76800, 77608 }, 947 { 115200, 117028 }, 948 { 128000, 129347 }, 949 { 153600, 156868 }, 950 { 230400, 237832 }, 951 { 250000, 254234 }, 952 { 256000, 273066 }, 953 { 460800, 491520 }, 954 { 500000, 567138 }, 955 { 576000, 670254 }, 956 { 921600, UINT_MAX } 957 }; 958 959 /* 960 * Quantises the baud rate as per AN205 Table 1 961 */ 962 static speed_t cp210x_get_an205_rate(speed_t baud) 963 { 964 int i; 965 966 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 967 if (baud <= cp210x_an205_table1[i].high) 968 break; 969 } 970 971 return cp210x_an205_table1[i].rate; 972 } 973 974 static speed_t cp210x_get_actual_rate(speed_t baud) 975 { 976 unsigned int prescale = 1; 977 unsigned int div; 978 979 if (baud <= 365) 980 prescale = 4; 981 982 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 983 baud = 48000000 / (2 * prescale * div); 984 985 return baud; 986 } 987 988 /* 989 * CP2101 supports the following baud rates: 990 * 991 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 992 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 993 * 994 * CP2102 and CP2103 support the following additional rates: 995 * 996 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 997 * 576000 998 * 999 * The device will map a requested rate to a supported one, but the result 1000 * of requests for rates greater than 1053257 is undefined (see AN205). 1001 * 1002 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1003 * respectively, with an error less than 1%. The actual rates are determined 1004 * by 1005 * 1006 * div = round(freq / (2 x prescale x request)) 1007 * actual = freq / (2 x prescale x div) 1008 * 1009 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1010 * or 1 otherwise. 1011 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1012 * otherwise. 1013 */ 1014 static void cp210x_change_speed(struct tty_struct *tty, 1015 struct usb_serial_port *port, struct ktermios *old_termios) 1016 { 1017 struct usb_serial *serial = port->serial; 1018 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1019 u32 baud; 1020 1021 /* 1022 * This maps the requested rate to the actual rate, a valid rate on 1023 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1024 * 1025 * NOTE: B0 is not implemented. 1026 */ 1027 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1028 1029 if (priv->use_actual_rate) 1030 baud = cp210x_get_actual_rate(baud); 1031 else if (baud < 1000000) 1032 baud = cp210x_get_an205_rate(baud); 1033 1034 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1035 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1036 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1037 if (old_termios) 1038 baud = old_termios->c_ospeed; 1039 else 1040 baud = 9600; 1041 } 1042 1043 tty_encode_baud_rate(tty, baud, baud); 1044 } 1045 1046 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1047 { 1048 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1049 int ret; 1050 1051 if (port_priv->event_mode) 1052 return; 1053 1054 port_priv->event_state = ES_DATA; 1055 port_priv->event_mode = true; 1056 1057 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1058 if (ret) { 1059 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1060 port_priv->event_mode = false; 1061 } 1062 } 1063 1064 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1065 { 1066 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1067 int ret; 1068 1069 if (!port_priv->event_mode) 1070 return; 1071 1072 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1073 if (ret) { 1074 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1075 return; 1076 } 1077 1078 port_priv->event_mode = false; 1079 } 1080 1081 static int cp210x_set_chars(struct usb_serial_port *port, 1082 struct cp210x_special_chars *chars) 1083 { 1084 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1085 struct usb_serial *serial = port->serial; 1086 void *dmabuf; 1087 int result; 1088 1089 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL); 1090 if (!dmabuf) 1091 return -ENOMEM; 1092 1093 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1094 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0, 1095 port_priv->bInterfaceNumber, 1096 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT); 1097 1098 kfree(dmabuf); 1099 1100 if (result < 0) { 1101 dev_err(&port->dev, "failed to set special chars: %d\n", result); 1102 return result; 1103 } 1104 1105 return 0; 1106 } 1107 1108 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1109 { 1110 bool iflag_change, cc_change; 1111 1112 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1113 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1114 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1115 1116 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1117 } 1118 1119 static void cp210x_set_flow_control(struct tty_struct *tty, 1120 struct usb_serial_port *port, struct ktermios *old_termios) 1121 { 1122 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1123 struct cp210x_special_chars chars; 1124 struct cp210x_flow_ctl flow_ctl; 1125 u32 flow_repl; 1126 u32 ctl_hs; 1127 int ret; 1128 1129 if (old_termios && 1130 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1131 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1132 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1133 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1134 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1135 return; 1136 } 1137 1138 if (I_IXON(tty) || I_IXOFF(tty)) { 1139 memset(&chars, 0, sizeof(chars)); 1140 1141 chars.bXonChar = START_CHAR(tty); 1142 chars.bXoffChar = STOP_CHAR(tty); 1143 1144 ret = cp210x_set_chars(port, &chars); 1145 if (ret) 1146 return; 1147 } 1148 1149 mutex_lock(&port_priv->mutex); 1150 1151 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1152 sizeof(flow_ctl)); 1153 if (ret) 1154 goto out_unlock; 1155 1156 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1157 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1158 1159 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1160 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1161 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1162 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1163 if (port_priv->dtr) 1164 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1165 else 1166 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1167 1168 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1169 if (C_CRTSCTS(tty)) { 1170 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1171 if (port_priv->rts) 1172 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1173 else 1174 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1175 port_priv->crtscts = true; 1176 } else { 1177 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1178 if (port_priv->rts) 1179 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1180 else 1181 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1182 port_priv->crtscts = false; 1183 } 1184 1185 if (I_IXOFF(tty)) 1186 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1187 else 1188 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1189 1190 if (I_IXON(tty)) 1191 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1192 else 1193 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1194 1195 flow_ctl.ulXonLimit = cpu_to_le32(128); 1196 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1197 1198 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1199 ctl_hs, flow_repl); 1200 1201 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1202 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1203 1204 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1205 sizeof(flow_ctl)); 1206 out_unlock: 1207 mutex_unlock(&port_priv->mutex); 1208 } 1209 1210 static void cp210x_set_termios(struct tty_struct *tty, 1211 struct usb_serial_port *port, struct ktermios *old_termios) 1212 { 1213 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1214 u16 bits; 1215 int ret; 1216 1217 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1218 return; 1219 1220 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1221 cp210x_change_speed(tty, port, old_termios); 1222 1223 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1224 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1225 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1226 tty->termios.c_cflag |= CS8; 1227 } 1228 1229 bits = 0; 1230 1231 switch (C_CSIZE(tty)) { 1232 case CS5: 1233 bits |= BITS_DATA_5; 1234 break; 1235 case CS6: 1236 bits |= BITS_DATA_6; 1237 break; 1238 case CS7: 1239 bits |= BITS_DATA_7; 1240 break; 1241 case CS8: 1242 default: 1243 bits |= BITS_DATA_8; 1244 break; 1245 } 1246 1247 if (C_PARENB(tty)) { 1248 if (C_CMSPAR(tty)) { 1249 if (C_PARODD(tty)) 1250 bits |= BITS_PARITY_MARK; 1251 else 1252 bits |= BITS_PARITY_SPACE; 1253 } else { 1254 if (C_PARODD(tty)) 1255 bits |= BITS_PARITY_ODD; 1256 else 1257 bits |= BITS_PARITY_EVEN; 1258 } 1259 } 1260 1261 if (C_CSTOPB(tty)) 1262 bits |= BITS_STOP_2; 1263 else 1264 bits |= BITS_STOP_1; 1265 1266 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1267 if (ret) 1268 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1269 1270 cp210x_set_flow_control(tty, port, old_termios); 1271 1272 /* 1273 * Enable event-insertion mode only if input parity checking is 1274 * enabled for now. 1275 */ 1276 if (I_INPCK(tty)) 1277 cp210x_enable_event_mode(port); 1278 else 1279 cp210x_disable_event_mode(port); 1280 } 1281 1282 static int cp210x_tiocmset(struct tty_struct *tty, 1283 unsigned int set, unsigned int clear) 1284 { 1285 struct usb_serial_port *port = tty->driver_data; 1286 return cp210x_tiocmset_port(port, set, clear); 1287 } 1288 1289 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1290 unsigned int set, unsigned int clear) 1291 { 1292 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1293 struct cp210x_flow_ctl flow_ctl; 1294 u32 ctl_hs, flow_repl; 1295 u16 control = 0; 1296 int ret; 1297 1298 mutex_lock(&port_priv->mutex); 1299 1300 if (set & TIOCM_RTS) { 1301 port_priv->rts = true; 1302 control |= CONTROL_RTS; 1303 control |= CONTROL_WRITE_RTS; 1304 } 1305 if (set & TIOCM_DTR) { 1306 port_priv->dtr = true; 1307 control |= CONTROL_DTR; 1308 control |= CONTROL_WRITE_DTR; 1309 } 1310 if (clear & TIOCM_RTS) { 1311 port_priv->rts = false; 1312 control &= ~CONTROL_RTS; 1313 control |= CONTROL_WRITE_RTS; 1314 } 1315 if (clear & TIOCM_DTR) { 1316 port_priv->dtr = false; 1317 control &= ~CONTROL_DTR; 1318 control |= CONTROL_WRITE_DTR; 1319 } 1320 1321 /* 1322 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1323 * flow control is enabled. 1324 */ 1325 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1326 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1327 sizeof(flow_ctl)); 1328 if (ret) 1329 goto out_unlock; 1330 1331 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1332 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1333 1334 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1335 if (port_priv->dtr) 1336 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1337 else 1338 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1339 1340 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1341 if (port_priv->rts) 1342 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1343 else 1344 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1345 1346 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1347 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1348 1349 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1350 __func__, ctl_hs, flow_repl); 1351 1352 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1353 sizeof(flow_ctl)); 1354 } else { 1355 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1356 1357 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1358 } 1359 out_unlock: 1360 mutex_unlock(&port_priv->mutex); 1361 1362 return ret; 1363 } 1364 1365 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1366 { 1367 if (on) 1368 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1369 else 1370 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1371 } 1372 1373 static int cp210x_tiocmget(struct tty_struct *tty) 1374 { 1375 struct usb_serial_port *port = tty->driver_data; 1376 u8 control; 1377 int result; 1378 1379 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1380 if (result) 1381 return result; 1382 1383 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1384 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1385 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1386 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1387 |((control & CONTROL_RING)? TIOCM_RI : 0) 1388 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1389 1390 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1391 1392 return result; 1393 } 1394 1395 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1396 { 1397 struct usb_serial_port *port = tty->driver_data; 1398 u16 state; 1399 1400 if (break_state == 0) 1401 state = BREAK_OFF; 1402 else 1403 state = BREAK_ON; 1404 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1405 state == BREAK_OFF ? "off" : "on"); 1406 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1407 } 1408 1409 #ifdef CONFIG_GPIOLIB 1410 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1411 { 1412 struct usb_serial *serial = gpiochip_get_data(gc); 1413 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1414 1415 if (priv->gpio_altfunc & BIT(offset)) 1416 return -ENODEV; 1417 1418 return 0; 1419 } 1420 1421 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1422 { 1423 struct usb_serial *serial = gpiochip_get_data(gc); 1424 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1425 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1426 int result; 1427 u8 buf; 1428 1429 if (priv->partnum == CP210X_PARTNUM_CP2105) 1430 req_type = REQTYPE_INTERFACE_TO_HOST; 1431 1432 result = usb_autopm_get_interface(serial->interface); 1433 if (result) 1434 return result; 1435 1436 result = cp210x_read_vendor_block(serial, req_type, 1437 CP210X_READ_LATCH, &buf, sizeof(buf)); 1438 usb_autopm_put_interface(serial->interface); 1439 if (result < 0) 1440 return result; 1441 1442 return !!(buf & BIT(gpio)); 1443 } 1444 1445 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1446 { 1447 struct usb_serial *serial = gpiochip_get_data(gc); 1448 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1449 struct cp210x_gpio_write buf; 1450 int result; 1451 1452 if (value == 1) 1453 buf.state = BIT(gpio); 1454 else 1455 buf.state = 0; 1456 1457 buf.mask = BIT(gpio); 1458 1459 result = usb_autopm_get_interface(serial->interface); 1460 if (result) 1461 goto out; 1462 1463 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1464 result = cp210x_write_vendor_block(serial, 1465 REQTYPE_HOST_TO_INTERFACE, 1466 CP210X_WRITE_LATCH, &buf, 1467 sizeof(buf)); 1468 } else { 1469 u16 wIndex = buf.state << 8 | buf.mask; 1470 1471 result = usb_control_msg(serial->dev, 1472 usb_sndctrlpipe(serial->dev, 0), 1473 CP210X_VENDOR_SPECIFIC, 1474 REQTYPE_HOST_TO_DEVICE, 1475 CP210X_WRITE_LATCH, 1476 wIndex, 1477 NULL, 0, USB_CTRL_SET_TIMEOUT); 1478 } 1479 1480 usb_autopm_put_interface(serial->interface); 1481 out: 1482 if (result < 0) { 1483 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1484 result); 1485 } 1486 } 1487 1488 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1489 { 1490 struct usb_serial *serial = gpiochip_get_data(gc); 1491 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1492 1493 return priv->gpio_input & BIT(gpio); 1494 } 1495 1496 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1497 { 1498 struct usb_serial *serial = gpiochip_get_data(gc); 1499 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1500 1501 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1502 /* hardware does not support an input mode */ 1503 return -ENOTSUPP; 1504 } 1505 1506 /* push-pull pins cannot be changed to be inputs */ 1507 if (priv->gpio_pushpull & BIT(gpio)) 1508 return -EINVAL; 1509 1510 /* make sure to release pin if it is being driven low */ 1511 cp210x_gpio_set(gc, gpio, 1); 1512 1513 priv->gpio_input |= BIT(gpio); 1514 1515 return 0; 1516 } 1517 1518 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1519 int value) 1520 { 1521 struct usb_serial *serial = gpiochip_get_data(gc); 1522 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1523 1524 priv->gpio_input &= ~BIT(gpio); 1525 cp210x_gpio_set(gc, gpio, value); 1526 1527 return 0; 1528 } 1529 1530 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1531 unsigned long config) 1532 { 1533 struct usb_serial *serial = gpiochip_get_data(gc); 1534 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1535 enum pin_config_param param = pinconf_to_config_param(config); 1536 1537 /* Succeed only if in correct mode (this can't be set at runtime) */ 1538 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1539 (priv->gpio_pushpull & BIT(gpio))) 1540 return 0; 1541 1542 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1543 !(priv->gpio_pushpull & BIT(gpio))) 1544 return 0; 1545 1546 return -ENOTSUPP; 1547 } 1548 1549 /* 1550 * This function is for configuring GPIO using shared pins, where other signals 1551 * are made unavailable by configuring the use of GPIO. This is believed to be 1552 * only applicable to the cp2105 at this point, the other devices supported by 1553 * this driver that provide GPIO do so in a way that does not impact other 1554 * signals and are thus expected to have very different initialisation. 1555 */ 1556 static int cp2105_gpioconf_init(struct usb_serial *serial) 1557 { 1558 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1559 struct cp210x_pin_mode mode; 1560 struct cp210x_dual_port_config config; 1561 u8 intf_num = cp210x_interface_num(serial); 1562 u8 iface_config; 1563 int result; 1564 1565 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1566 CP210X_GET_DEVICEMODE, &mode, 1567 sizeof(mode)); 1568 if (result < 0) 1569 return result; 1570 1571 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1572 CP210X_GET_PORTCONFIG, &config, 1573 sizeof(config)); 1574 if (result < 0) 1575 return result; 1576 1577 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1578 if (intf_num == 0) { 1579 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1580 /* mark all GPIOs of this interface as reserved */ 1581 priv->gpio_altfunc = 0xff; 1582 return 0; 1583 } 1584 1585 iface_config = config.eci_cfg; 1586 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1587 CP210X_ECI_GPIO_MODE_MASK) >> 1588 CP210X_ECI_GPIO_MODE_OFFSET); 1589 priv->gc.ngpio = 2; 1590 } else if (intf_num == 1) { 1591 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1592 /* mark all GPIOs of this interface as reserved */ 1593 priv->gpio_altfunc = 0xff; 1594 return 0; 1595 } 1596 1597 iface_config = config.sci_cfg; 1598 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1599 CP210X_SCI_GPIO_MODE_MASK) >> 1600 CP210X_SCI_GPIO_MODE_OFFSET); 1601 priv->gc.ngpio = 3; 1602 } else { 1603 return -ENODEV; 1604 } 1605 1606 /* mark all pins which are not in GPIO mode */ 1607 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1608 priv->gpio_altfunc |= BIT(0); 1609 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1610 CP2105_GPIO1_RS485_MODE)) 1611 priv->gpio_altfunc |= BIT(1); 1612 1613 /* driver implementation for CP2105 only supports outputs */ 1614 priv->gpio_input = 0; 1615 1616 return 0; 1617 } 1618 1619 static int cp2104_gpioconf_init(struct usb_serial *serial) 1620 { 1621 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1622 struct cp210x_single_port_config config; 1623 u8 iface_config; 1624 u8 gpio_latch; 1625 int result; 1626 u8 i; 1627 1628 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1629 CP210X_GET_PORTCONFIG, &config, 1630 sizeof(config)); 1631 if (result < 0) 1632 return result; 1633 1634 priv->gc.ngpio = 4; 1635 1636 iface_config = config.device_cfg; 1637 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1638 CP210X_GPIO_MODE_MASK) >> 1639 CP210X_GPIO_MODE_OFFSET); 1640 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1641 CP210X_GPIO_MODE_MASK) >> 1642 CP210X_GPIO_MODE_OFFSET); 1643 1644 /* mark all pins which are not in GPIO mode */ 1645 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1646 priv->gpio_altfunc |= BIT(0); 1647 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1648 priv->gpio_altfunc |= BIT(1); 1649 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1650 priv->gpio_altfunc |= BIT(2); 1651 1652 /* 1653 * Like CP2102N, CP2104 has also no strict input and output pin 1654 * modes. 1655 * Do the same input mode emulation as CP2102N. 1656 */ 1657 for (i = 0; i < priv->gc.ngpio; ++i) { 1658 /* 1659 * Set direction to "input" iff pin is open-drain and reset 1660 * value is 1. 1661 */ 1662 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1663 priv->gpio_input |= BIT(i); 1664 } 1665 1666 return 0; 1667 } 1668 1669 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1670 { 1671 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1672 const u16 config_size = 0x02a6; 1673 u8 gpio_rst_latch; 1674 u8 config_version; 1675 u8 gpio_pushpull; 1676 u8 *config_buf; 1677 u8 gpio_latch; 1678 u8 gpio_ctrl; 1679 int result; 1680 u8 i; 1681 1682 /* 1683 * Retrieve device configuration from the device. 1684 * The array received contains all customization settings done at the 1685 * factory/manufacturer. Format of the array is documented at the 1686 * time of writing at: 1687 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1688 */ 1689 config_buf = kmalloc(config_size, GFP_KERNEL); 1690 if (!config_buf) 1691 return -ENOMEM; 1692 1693 result = cp210x_read_vendor_block(serial, 1694 REQTYPE_DEVICE_TO_HOST, 1695 CP210X_READ_2NCONFIG, 1696 config_buf, 1697 config_size); 1698 if (result < 0) { 1699 kfree(config_buf); 1700 return result; 1701 } 1702 1703 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1704 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1705 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1706 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1707 1708 kfree(config_buf); 1709 1710 /* Make sure this is a config format we understand. */ 1711 if (config_version != 0x01) 1712 return -ENOTSUPP; 1713 1714 priv->gc.ngpio = 4; 1715 1716 /* 1717 * Get default pin states after reset. Needed so we can determine 1718 * the direction of an open-drain pin. 1719 */ 1720 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1721 1722 /* 0 indicates open-drain mode, 1 is push-pull */ 1723 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1724 1725 /* 0 indicates GPIO mode, 1 is alternate function */ 1726 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1727 1728 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1729 /* 1730 * For the QFN28 package, GPIO4-6 are controlled by 1731 * the low three bits of the mode/latch fields. 1732 * Contrary to the document linked above, the bits for 1733 * the SUSPEND pins are elsewhere. No alternate 1734 * function is available for these pins. 1735 */ 1736 priv->gc.ngpio = 7; 1737 gpio_latch |= (gpio_rst_latch & 7) << 4; 1738 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1739 } 1740 1741 /* 1742 * The CP2102N does not strictly has input and output pin modes, 1743 * it only knows open-drain and push-pull modes which is set at 1744 * factory. An open-drain pin can function both as an 1745 * input or an output. We emulate input mode for open-drain pins 1746 * by making sure they are not driven low, and we do not allow 1747 * push-pull pins to be set as an input. 1748 */ 1749 for (i = 0; i < priv->gc.ngpio; ++i) { 1750 /* 1751 * Set direction to "input" iff pin is open-drain and reset 1752 * value is 1. 1753 */ 1754 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1755 priv->gpio_input |= BIT(i); 1756 } 1757 1758 return 0; 1759 } 1760 1761 static int cp210x_gpio_init(struct usb_serial *serial) 1762 { 1763 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1764 int result; 1765 1766 switch (priv->partnum) { 1767 case CP210X_PARTNUM_CP2104: 1768 result = cp2104_gpioconf_init(serial); 1769 break; 1770 case CP210X_PARTNUM_CP2105: 1771 result = cp2105_gpioconf_init(serial); 1772 break; 1773 case CP210X_PARTNUM_CP2102N_QFN28: 1774 case CP210X_PARTNUM_CP2102N_QFN24: 1775 case CP210X_PARTNUM_CP2102N_QFN20: 1776 result = cp2102n_gpioconf_init(serial); 1777 break; 1778 default: 1779 return 0; 1780 } 1781 1782 if (result < 0) 1783 return result; 1784 1785 priv->gc.label = "cp210x"; 1786 priv->gc.request = cp210x_gpio_request; 1787 priv->gc.get_direction = cp210x_gpio_direction_get; 1788 priv->gc.direction_input = cp210x_gpio_direction_input; 1789 priv->gc.direction_output = cp210x_gpio_direction_output; 1790 priv->gc.get = cp210x_gpio_get; 1791 priv->gc.set = cp210x_gpio_set; 1792 priv->gc.set_config = cp210x_gpio_set_config; 1793 priv->gc.owner = THIS_MODULE; 1794 priv->gc.parent = &serial->interface->dev; 1795 priv->gc.base = -1; 1796 priv->gc.can_sleep = true; 1797 1798 result = gpiochip_add_data(&priv->gc, serial); 1799 if (!result) 1800 priv->gpio_registered = true; 1801 1802 return result; 1803 } 1804 1805 static void cp210x_gpio_remove(struct usb_serial *serial) 1806 { 1807 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1808 1809 if (priv->gpio_registered) { 1810 gpiochip_remove(&priv->gc); 1811 priv->gpio_registered = false; 1812 } 1813 } 1814 1815 #else 1816 1817 static int cp210x_gpio_init(struct usb_serial *serial) 1818 { 1819 return 0; 1820 } 1821 1822 static void cp210x_gpio_remove(struct usb_serial *serial) 1823 { 1824 /* Nothing to do */ 1825 } 1826 1827 #endif 1828 1829 static int cp210x_port_probe(struct usb_serial_port *port) 1830 { 1831 struct usb_serial *serial = port->serial; 1832 struct cp210x_port_private *port_priv; 1833 1834 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1835 if (!port_priv) 1836 return -ENOMEM; 1837 1838 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1839 mutex_init(&port_priv->mutex); 1840 1841 usb_set_serial_port_data(port, port_priv); 1842 1843 return 0; 1844 } 1845 1846 static void cp210x_port_remove(struct usb_serial_port *port) 1847 { 1848 struct cp210x_port_private *port_priv; 1849 1850 port_priv = usb_get_serial_port_data(port); 1851 kfree(port_priv); 1852 } 1853 1854 static void cp210x_init_max_speed(struct usb_serial *serial) 1855 { 1856 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1857 bool use_actual_rate = false; 1858 speed_t min = 300; 1859 speed_t max; 1860 1861 switch (priv->partnum) { 1862 case CP210X_PARTNUM_CP2101: 1863 max = 921600; 1864 break; 1865 case CP210X_PARTNUM_CP2102: 1866 case CP210X_PARTNUM_CP2103: 1867 max = 1000000; 1868 break; 1869 case CP210X_PARTNUM_CP2104: 1870 use_actual_rate = true; 1871 max = 2000000; 1872 break; 1873 case CP210X_PARTNUM_CP2108: 1874 max = 2000000; 1875 break; 1876 case CP210X_PARTNUM_CP2105: 1877 if (cp210x_interface_num(serial) == 0) { 1878 use_actual_rate = true; 1879 max = 2000000; /* ECI */ 1880 } else { 1881 min = 2400; 1882 max = 921600; /* SCI */ 1883 } 1884 break; 1885 case CP210X_PARTNUM_CP2102N_QFN28: 1886 case CP210X_PARTNUM_CP2102N_QFN24: 1887 case CP210X_PARTNUM_CP2102N_QFN20: 1888 use_actual_rate = true; 1889 max = 3000000; 1890 break; 1891 default: 1892 max = 2000000; 1893 break; 1894 } 1895 1896 priv->min_speed = min; 1897 priv->max_speed = max; 1898 priv->use_actual_rate = use_actual_rate; 1899 } 1900 1901 static int cp210x_attach(struct usb_serial *serial) 1902 { 1903 int result; 1904 struct cp210x_serial_private *priv; 1905 1906 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1907 if (!priv) 1908 return -ENOMEM; 1909 1910 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1911 CP210X_GET_PARTNUM, &priv->partnum, 1912 sizeof(priv->partnum)); 1913 if (result < 0) { 1914 dev_warn(&serial->interface->dev, 1915 "querying part number failed\n"); 1916 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1917 } 1918 1919 usb_set_serial_data(serial, priv); 1920 1921 cp210x_init_max_speed(serial); 1922 1923 result = cp210x_gpio_init(serial); 1924 if (result < 0) { 1925 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1926 result); 1927 } 1928 1929 return 0; 1930 } 1931 1932 static void cp210x_disconnect(struct usb_serial *serial) 1933 { 1934 cp210x_gpio_remove(serial); 1935 } 1936 1937 static void cp210x_release(struct usb_serial *serial) 1938 { 1939 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1940 1941 cp210x_gpio_remove(serial); 1942 1943 kfree(priv); 1944 } 1945 1946 module_usb_serial_driver(serial_drivers, id_table); 1947 1948 MODULE_DESCRIPTION(DRIVER_DESC); 1949 MODULE_LICENSE("GPL v2"); 1950