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, 0x88D8) }, /* Acuity Brands nLight Air Adapter */ 149 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 151 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 152 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 153 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 154 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 155 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 156 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 157 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 158 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 159 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 160 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 161 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 162 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 163 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 164 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 165 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 166 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 167 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 168 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 169 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 170 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 171 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 172 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 173 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 174 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 175 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 176 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 177 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 178 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 179 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 180 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 181 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 182 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 183 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 184 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 185 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 186 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 187 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 188 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 189 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 191 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 192 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 193 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 194 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 195 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 196 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 197 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 198 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 199 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 200 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 201 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 202 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 203 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 204 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 205 { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 Display serial interface */ 206 { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 M.2 Key E serial interface */ 207 { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */ 208 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 209 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 210 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 211 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 212 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 213 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 214 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 215 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 216 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 217 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 218 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 219 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 220 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 221 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 222 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 223 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 224 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 225 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 228 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 229 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 230 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 231 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 232 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 233 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 234 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 235 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 236 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 237 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 238 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 239 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 240 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 241 { } /* Terminating Entry */ 242 }; 243 244 MODULE_DEVICE_TABLE(usb, id_table); 245 246 struct cp210x_serial_private { 247 #ifdef CONFIG_GPIOLIB 248 struct gpio_chip gc; 249 bool gpio_registered; 250 u8 gpio_pushpull; 251 u8 gpio_altfunc; 252 u8 gpio_input; 253 #endif 254 u8 partnum; 255 speed_t min_speed; 256 speed_t max_speed; 257 bool use_actual_rate; 258 }; 259 260 enum cp210x_event_state { 261 ES_DATA, 262 ES_ESCAPE, 263 ES_LSR, 264 ES_LSR_DATA_0, 265 ES_LSR_DATA_1, 266 ES_MSR 267 }; 268 269 struct cp210x_port_private { 270 u8 bInterfaceNumber; 271 bool event_mode; 272 enum cp210x_event_state event_state; 273 u8 lsr; 274 275 struct mutex mutex; 276 bool crtscts; 277 bool dtr; 278 bool rts; 279 }; 280 281 static struct usb_serial_driver cp210x_device = { 282 .driver = { 283 .owner = THIS_MODULE, 284 .name = "cp210x", 285 }, 286 .id_table = id_table, 287 .num_ports = 1, 288 .bulk_in_size = 256, 289 .bulk_out_size = 256, 290 .open = cp210x_open, 291 .close = cp210x_close, 292 .break_ctl = cp210x_break_ctl, 293 .set_termios = cp210x_set_termios, 294 .tx_empty = cp210x_tx_empty, 295 .throttle = usb_serial_generic_throttle, 296 .unthrottle = usb_serial_generic_unthrottle, 297 .tiocmget = cp210x_tiocmget, 298 .tiocmset = cp210x_tiocmset, 299 .get_icount = usb_serial_generic_get_icount, 300 .attach = cp210x_attach, 301 .disconnect = cp210x_disconnect, 302 .release = cp210x_release, 303 .port_probe = cp210x_port_probe, 304 .port_remove = cp210x_port_remove, 305 .dtr_rts = cp210x_dtr_rts, 306 .process_read_urb = cp210x_process_read_urb, 307 }; 308 309 static struct usb_serial_driver * const serial_drivers[] = { 310 &cp210x_device, NULL 311 }; 312 313 /* Config request types */ 314 #define REQTYPE_HOST_TO_INTERFACE 0x41 315 #define REQTYPE_INTERFACE_TO_HOST 0xc1 316 #define REQTYPE_HOST_TO_DEVICE 0x40 317 #define REQTYPE_DEVICE_TO_HOST 0xc0 318 319 /* Config request codes */ 320 #define CP210X_IFC_ENABLE 0x00 321 #define CP210X_SET_BAUDDIV 0x01 322 #define CP210X_GET_BAUDDIV 0x02 323 #define CP210X_SET_LINE_CTL 0x03 324 #define CP210X_GET_LINE_CTL 0x04 325 #define CP210X_SET_BREAK 0x05 326 #define CP210X_IMM_CHAR 0x06 327 #define CP210X_SET_MHS 0x07 328 #define CP210X_GET_MDMSTS 0x08 329 #define CP210X_SET_XON 0x09 330 #define CP210X_SET_XOFF 0x0A 331 #define CP210X_SET_EVENTMASK 0x0B 332 #define CP210X_GET_EVENTMASK 0x0C 333 #define CP210X_SET_CHAR 0x0D 334 #define CP210X_GET_CHARS 0x0E 335 #define CP210X_GET_PROPS 0x0F 336 #define CP210X_GET_COMM_STATUS 0x10 337 #define CP210X_RESET 0x11 338 #define CP210X_PURGE 0x12 339 #define CP210X_SET_FLOW 0x13 340 #define CP210X_GET_FLOW 0x14 341 #define CP210X_EMBED_EVENTS 0x15 342 #define CP210X_GET_EVENTSTATE 0x16 343 #define CP210X_SET_CHARS 0x19 344 #define CP210X_GET_BAUDRATE 0x1D 345 #define CP210X_SET_BAUDRATE 0x1E 346 #define CP210X_VENDOR_SPECIFIC 0xFF 347 348 /* CP210X_IFC_ENABLE */ 349 #define UART_ENABLE 0x0001 350 #define UART_DISABLE 0x0000 351 352 /* CP210X_(SET|GET)_BAUDDIV */ 353 #define BAUD_RATE_GEN_FREQ 0x384000 354 355 /* CP210X_(SET|GET)_LINE_CTL */ 356 #define BITS_DATA_MASK 0X0f00 357 #define BITS_DATA_5 0X0500 358 #define BITS_DATA_6 0X0600 359 #define BITS_DATA_7 0X0700 360 #define BITS_DATA_8 0X0800 361 #define BITS_DATA_9 0X0900 362 363 #define BITS_PARITY_MASK 0x00f0 364 #define BITS_PARITY_NONE 0x0000 365 #define BITS_PARITY_ODD 0x0010 366 #define BITS_PARITY_EVEN 0x0020 367 #define BITS_PARITY_MARK 0x0030 368 #define BITS_PARITY_SPACE 0x0040 369 370 #define BITS_STOP_MASK 0x000f 371 #define BITS_STOP_1 0x0000 372 #define BITS_STOP_1_5 0x0001 373 #define BITS_STOP_2 0x0002 374 375 /* CP210X_SET_BREAK */ 376 #define BREAK_ON 0x0001 377 #define BREAK_OFF 0x0000 378 379 /* CP210X_(SET_MHS|GET_MDMSTS) */ 380 #define CONTROL_DTR 0x0001 381 #define CONTROL_RTS 0x0002 382 #define CONTROL_CTS 0x0010 383 #define CONTROL_DSR 0x0020 384 #define CONTROL_RING 0x0040 385 #define CONTROL_DCD 0x0080 386 #define CONTROL_WRITE_DTR 0x0100 387 #define CONTROL_WRITE_RTS 0x0200 388 389 /* CP210X_(GET|SET)_CHARS */ 390 struct cp210x_special_chars { 391 u8 bEofChar; 392 u8 bErrorChar; 393 u8 bBreakChar; 394 u8 bEventChar; 395 u8 bXonChar; 396 u8 bXoffChar; 397 }; 398 399 /* CP210X_VENDOR_SPECIFIC values */ 400 #define CP210X_READ_2NCONFIG 0x000E 401 #define CP210X_READ_LATCH 0x00C2 402 #define CP210X_GET_PARTNUM 0x370B 403 #define CP210X_GET_PORTCONFIG 0x370C 404 #define CP210X_GET_DEVICEMODE 0x3711 405 #define CP210X_WRITE_LATCH 0x37E1 406 407 /* Part number definitions */ 408 #define CP210X_PARTNUM_CP2101 0x01 409 #define CP210X_PARTNUM_CP2102 0x02 410 #define CP210X_PARTNUM_CP2103 0x03 411 #define CP210X_PARTNUM_CP2104 0x04 412 #define CP210X_PARTNUM_CP2105 0x05 413 #define CP210X_PARTNUM_CP2108 0x08 414 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 415 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 416 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 417 #define CP210X_PARTNUM_UNKNOWN 0xFF 418 419 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 420 struct cp210x_comm_status { 421 __le32 ulErrors; 422 __le32 ulHoldReasons; 423 __le32 ulAmountInInQueue; 424 __le32 ulAmountInOutQueue; 425 u8 bEofReceived; 426 u8 bWaitForImmediate; 427 u8 bReserved; 428 } __packed; 429 430 /* 431 * CP210X_PURGE - 16 bits passed in wValue of USB request. 432 * SiLabs app note AN571 gives a strange description of the 4 bits: 433 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 434 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 435 */ 436 #define PURGE_ALL 0x000f 437 438 /* CP210X_EMBED_EVENTS */ 439 #define CP210X_ESCCHAR 0xec 440 441 #define CP210X_LSR_OVERRUN BIT(1) 442 #define CP210X_LSR_PARITY BIT(2) 443 #define CP210X_LSR_FRAME BIT(3) 444 #define CP210X_LSR_BREAK BIT(4) 445 446 447 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 448 struct cp210x_flow_ctl { 449 __le32 ulControlHandshake; 450 __le32 ulFlowReplace; 451 __le32 ulXonLimit; 452 __le32 ulXoffLimit; 453 }; 454 455 /* cp210x_flow_ctl::ulControlHandshake */ 456 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 457 #define CP210X_SERIAL_DTR_INACTIVE (0 << 0) 458 #define CP210X_SERIAL_DTR_ACTIVE (1 << 0) 459 #define CP210X_SERIAL_DTR_FLOW_CTL (2 << 0) 460 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 461 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 462 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 463 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 464 465 /* cp210x_flow_ctl::ulFlowReplace */ 466 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 467 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 468 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 469 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 470 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 471 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 472 #define CP210X_SERIAL_RTS_INACTIVE (0 << 6) 473 #define CP210X_SERIAL_RTS_ACTIVE (1 << 6) 474 #define CP210X_SERIAL_RTS_FLOW_CTL (2 << 6) 475 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 476 477 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 478 struct cp210x_pin_mode { 479 u8 eci; 480 u8 sci; 481 }; 482 483 #define CP210X_PIN_MODE_MODEM 0 484 #define CP210X_PIN_MODE_GPIO BIT(0) 485 486 /* 487 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 488 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 489 */ 490 struct cp210x_dual_port_config { 491 __le16 gpio_mode; 492 u8 __pad0[2]; 493 __le16 reset_state; 494 u8 __pad1[4]; 495 __le16 suspend_state; 496 u8 sci_cfg; 497 u8 eci_cfg; 498 u8 device_cfg; 499 } __packed; 500 501 /* 502 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 503 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 504 */ 505 struct cp210x_single_port_config { 506 __le16 gpio_mode; 507 u8 __pad0[2]; 508 __le16 reset_state; 509 u8 __pad1[4]; 510 __le16 suspend_state; 511 u8 device_cfg; 512 } __packed; 513 514 /* GPIO modes */ 515 #define CP210X_SCI_GPIO_MODE_OFFSET 9 516 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 517 518 #define CP210X_ECI_GPIO_MODE_OFFSET 2 519 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 520 521 #define CP210X_GPIO_MODE_OFFSET 8 522 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 523 524 /* CP2105 port configuration values */ 525 #define CP2105_GPIO0_TXLED_MODE BIT(0) 526 #define CP2105_GPIO1_RXLED_MODE BIT(1) 527 #define CP2105_GPIO1_RS485_MODE BIT(2) 528 529 /* CP2104 port configuration values */ 530 #define CP2104_GPIO0_TXLED_MODE BIT(0) 531 #define CP2104_GPIO1_RXLED_MODE BIT(1) 532 #define CP2104_GPIO2_RS485_MODE BIT(2) 533 534 /* CP2102N configuration array indices */ 535 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 536 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 537 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 538 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 539 540 /* CP2102N QFN20 port configuration values */ 541 #define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2) 542 #define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3) 543 #define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4) 544 #define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6) 545 546 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 547 struct cp210x_gpio_write { 548 u8 mask; 549 u8 state; 550 }; 551 552 /* 553 * Helper to get interface number when we only have struct usb_serial. 554 */ 555 static u8 cp210x_interface_num(struct usb_serial *serial) 556 { 557 struct usb_host_interface *cur_altsetting; 558 559 cur_altsetting = serial->interface->cur_altsetting; 560 561 return cur_altsetting->desc.bInterfaceNumber; 562 } 563 564 /* 565 * Reads a variable-sized block of CP210X_ registers, identified by req. 566 * Returns data into buf in native USB byte order. 567 */ 568 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 569 void *buf, int bufsize) 570 { 571 struct usb_serial *serial = port->serial; 572 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 573 void *dmabuf; 574 int result; 575 576 dmabuf = kmalloc(bufsize, GFP_KERNEL); 577 if (!dmabuf) 578 return -ENOMEM; 579 580 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 581 req, REQTYPE_INTERFACE_TO_HOST, 0, 582 port_priv->bInterfaceNumber, dmabuf, bufsize, 583 USB_CTRL_SET_TIMEOUT); 584 if (result == bufsize) { 585 memcpy(buf, dmabuf, bufsize); 586 result = 0; 587 } else { 588 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 589 req, bufsize, result); 590 if (result >= 0) 591 result = -EIO; 592 } 593 594 kfree(dmabuf); 595 596 return result; 597 } 598 599 /* 600 * Reads any 8-bit CP210X_ register identified by req. 601 */ 602 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 603 { 604 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 605 } 606 607 /* 608 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 609 * Returns data into buf in native USB byte order. 610 */ 611 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 612 void *buf, int bufsize) 613 { 614 void *dmabuf; 615 int result; 616 617 dmabuf = kmalloc(bufsize, GFP_KERNEL); 618 if (!dmabuf) 619 return -ENOMEM; 620 621 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 622 CP210X_VENDOR_SPECIFIC, type, val, 623 cp210x_interface_num(serial), dmabuf, bufsize, 624 USB_CTRL_GET_TIMEOUT); 625 if (result == bufsize) { 626 memcpy(buf, dmabuf, bufsize); 627 result = 0; 628 } else { 629 dev_err(&serial->interface->dev, 630 "failed to get vendor val 0x%04x size %d: %d\n", val, 631 bufsize, result); 632 if (result >= 0) 633 result = -EIO; 634 } 635 636 kfree(dmabuf); 637 638 return result; 639 } 640 641 /* 642 * Writes any 16-bit CP210X_ register (req) whose value is passed 643 * entirely in the wValue field of the USB request. 644 */ 645 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 646 { 647 struct usb_serial *serial = port->serial; 648 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 649 int result; 650 651 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 652 req, REQTYPE_HOST_TO_INTERFACE, val, 653 port_priv->bInterfaceNumber, NULL, 0, 654 USB_CTRL_SET_TIMEOUT); 655 if (result < 0) { 656 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 657 req, result); 658 } 659 660 return result; 661 } 662 663 /* 664 * Writes a variable-sized block of CP210X_ registers, identified by req. 665 * Data in buf must be in native USB byte order. 666 */ 667 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 668 void *buf, int bufsize) 669 { 670 struct usb_serial *serial = port->serial; 671 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 672 void *dmabuf; 673 int result; 674 675 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 676 if (!dmabuf) 677 return -ENOMEM; 678 679 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 680 req, REQTYPE_HOST_TO_INTERFACE, 0, 681 port_priv->bInterfaceNumber, dmabuf, bufsize, 682 USB_CTRL_SET_TIMEOUT); 683 684 kfree(dmabuf); 685 686 if (result < 0) { 687 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 688 req, bufsize, result); 689 return result; 690 } 691 692 return 0; 693 } 694 695 /* 696 * Writes any 32-bit CP210X_ register identified by req. 697 */ 698 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 699 { 700 __le32 le32_val; 701 702 le32_val = cpu_to_le32(val); 703 704 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 705 } 706 707 #ifdef CONFIG_GPIOLIB 708 /* 709 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 710 * Data in buf must be in native USB byte order. 711 */ 712 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 713 u16 val, void *buf, int bufsize) 714 { 715 void *dmabuf; 716 int result; 717 718 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 719 if (!dmabuf) 720 return -ENOMEM; 721 722 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 723 CP210X_VENDOR_SPECIFIC, type, val, 724 cp210x_interface_num(serial), dmabuf, bufsize, 725 USB_CTRL_SET_TIMEOUT); 726 727 kfree(dmabuf); 728 729 if (result < 0) { 730 dev_err(&serial->interface->dev, 731 "failed to set vendor val 0x%04x size %d: %d\n", val, 732 bufsize, result); 733 return result; 734 } 735 736 return 0; 737 } 738 #endif 739 740 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 741 { 742 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 743 int result; 744 745 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 746 if (result) { 747 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 748 return result; 749 } 750 751 if (tty) 752 cp210x_set_termios(tty, port, NULL); 753 754 result = usb_serial_generic_open(tty, port); 755 if (result) 756 goto err_disable; 757 758 return 0; 759 760 err_disable: 761 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 762 port_priv->event_mode = false; 763 764 return result; 765 } 766 767 static void cp210x_close(struct usb_serial_port *port) 768 { 769 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 770 771 usb_serial_generic_close(port); 772 773 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 774 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 775 776 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 777 778 /* Disabling the interface disables event-insertion mode. */ 779 port_priv->event_mode = false; 780 } 781 782 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 783 { 784 if (lsr & CP210X_LSR_BREAK) { 785 port->icount.brk++; 786 *flag = TTY_BREAK; 787 } else if (lsr & CP210X_LSR_PARITY) { 788 port->icount.parity++; 789 *flag = TTY_PARITY; 790 } else if (lsr & CP210X_LSR_FRAME) { 791 port->icount.frame++; 792 *flag = TTY_FRAME; 793 } 794 795 if (lsr & CP210X_LSR_OVERRUN) { 796 port->icount.overrun++; 797 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 798 } 799 } 800 801 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 802 { 803 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 804 805 switch (port_priv->event_state) { 806 case ES_DATA: 807 if (*ch == CP210X_ESCCHAR) { 808 port_priv->event_state = ES_ESCAPE; 809 break; 810 } 811 return false; 812 case ES_ESCAPE: 813 switch (*ch) { 814 case 0: 815 dev_dbg(&port->dev, "%s - escape char\n", __func__); 816 *ch = CP210X_ESCCHAR; 817 port_priv->event_state = ES_DATA; 818 return false; 819 case 1: 820 port_priv->event_state = ES_LSR_DATA_0; 821 break; 822 case 2: 823 port_priv->event_state = ES_LSR; 824 break; 825 case 3: 826 port_priv->event_state = ES_MSR; 827 break; 828 default: 829 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 830 port_priv->event_state = ES_DATA; 831 break; 832 } 833 break; 834 case ES_LSR_DATA_0: 835 port_priv->lsr = *ch; 836 port_priv->event_state = ES_LSR_DATA_1; 837 break; 838 case ES_LSR_DATA_1: 839 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 840 __func__, port_priv->lsr, *ch); 841 cp210x_process_lsr(port, port_priv->lsr, flag); 842 port_priv->event_state = ES_DATA; 843 return false; 844 case ES_LSR: 845 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 846 port_priv->lsr = *ch; 847 cp210x_process_lsr(port, port_priv->lsr, flag); 848 port_priv->event_state = ES_DATA; 849 break; 850 case ES_MSR: 851 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 852 /* unimplemented */ 853 port_priv->event_state = ES_DATA; 854 break; 855 } 856 857 return true; 858 } 859 860 static void cp210x_process_read_urb(struct urb *urb) 861 { 862 struct usb_serial_port *port = urb->context; 863 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 864 unsigned char *ch = urb->transfer_buffer; 865 char flag; 866 int i; 867 868 if (!urb->actual_length) 869 return; 870 871 if (port_priv->event_mode) { 872 for (i = 0; i < urb->actual_length; i++, ch++) { 873 flag = TTY_NORMAL; 874 875 if (cp210x_process_char(port, ch, &flag)) 876 continue; 877 878 tty_insert_flip_char(&port->port, *ch, flag); 879 } 880 } else { 881 tty_insert_flip_string(&port->port, ch, urb->actual_length); 882 } 883 tty_flip_buffer_push(&port->port); 884 } 885 886 /* 887 * Read how many bytes are waiting in the TX queue. 888 */ 889 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 890 u32 *count) 891 { 892 struct usb_serial *serial = port->serial; 893 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 894 struct cp210x_comm_status *sts; 895 int result; 896 897 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 898 if (!sts) 899 return -ENOMEM; 900 901 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 902 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 903 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 904 USB_CTRL_GET_TIMEOUT); 905 if (result == sizeof(*sts)) { 906 *count = le32_to_cpu(sts->ulAmountInOutQueue); 907 result = 0; 908 } else { 909 dev_err(&port->dev, "failed to get comm status: %d\n", result); 910 if (result >= 0) 911 result = -EIO; 912 } 913 914 kfree(sts); 915 916 return result; 917 } 918 919 static bool cp210x_tx_empty(struct usb_serial_port *port) 920 { 921 int err; 922 u32 count; 923 924 err = cp210x_get_tx_queue_byte_count(port, &count); 925 if (err) 926 return true; 927 928 return !count; 929 } 930 931 struct cp210x_rate { 932 speed_t rate; 933 speed_t high; 934 }; 935 936 static const struct cp210x_rate cp210x_an205_table1[] = { 937 { 300, 300 }, 938 { 600, 600 }, 939 { 1200, 1200 }, 940 { 1800, 1800 }, 941 { 2400, 2400 }, 942 { 4000, 4000 }, 943 { 4800, 4803 }, 944 { 7200, 7207 }, 945 { 9600, 9612 }, 946 { 14400, 14428 }, 947 { 16000, 16062 }, 948 { 19200, 19250 }, 949 { 28800, 28912 }, 950 { 38400, 38601 }, 951 { 51200, 51558 }, 952 { 56000, 56280 }, 953 { 57600, 58053 }, 954 { 64000, 64111 }, 955 { 76800, 77608 }, 956 { 115200, 117028 }, 957 { 128000, 129347 }, 958 { 153600, 156868 }, 959 { 230400, 237832 }, 960 { 250000, 254234 }, 961 { 256000, 273066 }, 962 { 460800, 491520 }, 963 { 500000, 567138 }, 964 { 576000, 670254 }, 965 { 921600, UINT_MAX } 966 }; 967 968 /* 969 * Quantises the baud rate as per AN205 Table 1 970 */ 971 static speed_t cp210x_get_an205_rate(speed_t baud) 972 { 973 int i; 974 975 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 976 if (baud <= cp210x_an205_table1[i].high) 977 break; 978 } 979 980 return cp210x_an205_table1[i].rate; 981 } 982 983 static speed_t cp210x_get_actual_rate(speed_t baud) 984 { 985 unsigned int prescale = 1; 986 unsigned int div; 987 988 if (baud <= 365) 989 prescale = 4; 990 991 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 992 baud = 48000000 / (2 * prescale * div); 993 994 return baud; 995 } 996 997 /* 998 * CP2101 supports the following baud rates: 999 * 1000 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1001 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1002 * 1003 * CP2102 and CP2103 support the following additional rates: 1004 * 1005 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1006 * 576000 1007 * 1008 * The device will map a requested rate to a supported one, but the result 1009 * of requests for rates greater than 1053257 is undefined (see AN205). 1010 * 1011 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1012 * respectively, with an error less than 1%. The actual rates are determined 1013 * by 1014 * 1015 * div = round(freq / (2 x prescale x request)) 1016 * actual = freq / (2 x prescale x div) 1017 * 1018 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1019 * or 1 otherwise. 1020 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1021 * otherwise. 1022 */ 1023 static void cp210x_change_speed(struct tty_struct *tty, 1024 struct usb_serial_port *port, struct ktermios *old_termios) 1025 { 1026 struct usb_serial *serial = port->serial; 1027 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1028 u32 baud; 1029 1030 /* 1031 * This maps the requested rate to the actual rate, a valid rate on 1032 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1033 * 1034 * NOTE: B0 is not implemented. 1035 */ 1036 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1037 1038 if (priv->use_actual_rate) 1039 baud = cp210x_get_actual_rate(baud); 1040 else if (baud < 1000000) 1041 baud = cp210x_get_an205_rate(baud); 1042 1043 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1044 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1045 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1046 if (old_termios) 1047 baud = old_termios->c_ospeed; 1048 else 1049 baud = 9600; 1050 } 1051 1052 tty_encode_baud_rate(tty, baud, baud); 1053 } 1054 1055 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1056 { 1057 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1058 int ret; 1059 1060 if (port_priv->event_mode) 1061 return; 1062 1063 port_priv->event_state = ES_DATA; 1064 port_priv->event_mode = true; 1065 1066 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1067 if (ret) { 1068 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1069 port_priv->event_mode = false; 1070 } 1071 } 1072 1073 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1074 { 1075 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1076 int ret; 1077 1078 if (!port_priv->event_mode) 1079 return; 1080 1081 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1082 if (ret) { 1083 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1084 return; 1085 } 1086 1087 port_priv->event_mode = false; 1088 } 1089 1090 static int cp210x_set_chars(struct usb_serial_port *port, 1091 struct cp210x_special_chars *chars) 1092 { 1093 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1094 struct usb_serial *serial = port->serial; 1095 void *dmabuf; 1096 int result; 1097 1098 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL); 1099 if (!dmabuf) 1100 return -ENOMEM; 1101 1102 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1103 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0, 1104 port_priv->bInterfaceNumber, 1105 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT); 1106 1107 kfree(dmabuf); 1108 1109 if (result < 0) { 1110 dev_err(&port->dev, "failed to set special chars: %d\n", result); 1111 return result; 1112 } 1113 1114 return 0; 1115 } 1116 1117 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1118 { 1119 bool iflag_change, cc_change; 1120 1121 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1122 cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] || 1123 a->c_cc[VSTOP] != b->c_cc[VSTOP]; 1124 1125 return tty_termios_hw_change(a, b) || iflag_change || cc_change; 1126 } 1127 1128 static void cp210x_set_flow_control(struct tty_struct *tty, 1129 struct usb_serial_port *port, struct ktermios *old_termios) 1130 { 1131 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1132 struct cp210x_special_chars chars; 1133 struct cp210x_flow_ctl flow_ctl; 1134 u32 flow_repl; 1135 u32 ctl_hs; 1136 int ret; 1137 1138 if (old_termios && 1139 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1140 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1141 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) && 1142 START_CHAR(tty) == old_termios->c_cc[VSTART] && 1143 STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) { 1144 return; 1145 } 1146 1147 if (I_IXON(tty) || I_IXOFF(tty)) { 1148 memset(&chars, 0, sizeof(chars)); 1149 1150 chars.bXonChar = START_CHAR(tty); 1151 chars.bXoffChar = STOP_CHAR(tty); 1152 1153 ret = cp210x_set_chars(port, &chars); 1154 if (ret) 1155 return; 1156 } 1157 1158 mutex_lock(&port_priv->mutex); 1159 1160 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1161 sizeof(flow_ctl)); 1162 if (ret) 1163 goto out_unlock; 1164 1165 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1166 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1167 1168 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1169 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1170 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1171 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1172 if (port_priv->dtr) 1173 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1174 else 1175 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1176 1177 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1178 if (C_CRTSCTS(tty)) { 1179 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1180 if (port_priv->rts) 1181 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1182 else 1183 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1184 port_priv->crtscts = true; 1185 } else { 1186 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1187 if (port_priv->rts) 1188 flow_repl |= CP210X_SERIAL_RTS_ACTIVE; 1189 else 1190 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1191 port_priv->crtscts = false; 1192 } 1193 1194 if (I_IXOFF(tty)) 1195 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1196 else 1197 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1198 1199 if (I_IXON(tty)) 1200 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1201 else 1202 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1203 1204 flow_ctl.ulXonLimit = cpu_to_le32(128); 1205 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1206 1207 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__, 1208 ctl_hs, flow_repl); 1209 1210 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1211 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1212 1213 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1214 sizeof(flow_ctl)); 1215 out_unlock: 1216 mutex_unlock(&port_priv->mutex); 1217 } 1218 1219 static void cp210x_set_termios(struct tty_struct *tty, 1220 struct usb_serial_port *port, struct ktermios *old_termios) 1221 { 1222 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1223 u16 bits; 1224 int ret; 1225 1226 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1227 return; 1228 1229 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1230 cp210x_change_speed(tty, port, old_termios); 1231 1232 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1233 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1234 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1235 tty->termios.c_cflag |= CS8; 1236 } 1237 1238 bits = 0; 1239 1240 switch (C_CSIZE(tty)) { 1241 case CS5: 1242 bits |= BITS_DATA_5; 1243 break; 1244 case CS6: 1245 bits |= BITS_DATA_6; 1246 break; 1247 case CS7: 1248 bits |= BITS_DATA_7; 1249 break; 1250 case CS8: 1251 default: 1252 bits |= BITS_DATA_8; 1253 break; 1254 } 1255 1256 if (C_PARENB(tty)) { 1257 if (C_CMSPAR(tty)) { 1258 if (C_PARODD(tty)) 1259 bits |= BITS_PARITY_MARK; 1260 else 1261 bits |= BITS_PARITY_SPACE; 1262 } else { 1263 if (C_PARODD(tty)) 1264 bits |= BITS_PARITY_ODD; 1265 else 1266 bits |= BITS_PARITY_EVEN; 1267 } 1268 } 1269 1270 if (C_CSTOPB(tty)) 1271 bits |= BITS_STOP_2; 1272 else 1273 bits |= BITS_STOP_1; 1274 1275 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1276 if (ret) 1277 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1278 1279 cp210x_set_flow_control(tty, port, old_termios); 1280 1281 /* 1282 * Enable event-insertion mode only if input parity checking is 1283 * enabled for now. 1284 */ 1285 if (I_INPCK(tty)) 1286 cp210x_enable_event_mode(port); 1287 else 1288 cp210x_disable_event_mode(port); 1289 } 1290 1291 static int cp210x_tiocmset(struct tty_struct *tty, 1292 unsigned int set, unsigned int clear) 1293 { 1294 struct usb_serial_port *port = tty->driver_data; 1295 return cp210x_tiocmset_port(port, set, clear); 1296 } 1297 1298 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1299 unsigned int set, unsigned int clear) 1300 { 1301 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1302 struct cp210x_flow_ctl flow_ctl; 1303 u32 ctl_hs, flow_repl; 1304 u16 control = 0; 1305 int ret; 1306 1307 mutex_lock(&port_priv->mutex); 1308 1309 if (set & TIOCM_RTS) { 1310 port_priv->rts = true; 1311 control |= CONTROL_RTS; 1312 control |= CONTROL_WRITE_RTS; 1313 } 1314 if (set & TIOCM_DTR) { 1315 port_priv->dtr = true; 1316 control |= CONTROL_DTR; 1317 control |= CONTROL_WRITE_DTR; 1318 } 1319 if (clear & TIOCM_RTS) { 1320 port_priv->rts = false; 1321 control &= ~CONTROL_RTS; 1322 control |= CONTROL_WRITE_RTS; 1323 } 1324 if (clear & TIOCM_DTR) { 1325 port_priv->dtr = false; 1326 control &= ~CONTROL_DTR; 1327 control |= CONTROL_WRITE_DTR; 1328 } 1329 1330 /* 1331 * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware 1332 * flow control is enabled. 1333 */ 1334 if (port_priv->crtscts && control & CONTROL_WRITE_RTS) { 1335 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1336 sizeof(flow_ctl)); 1337 if (ret) 1338 goto out_unlock; 1339 1340 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1341 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1342 1343 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1344 if (port_priv->dtr) 1345 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE; 1346 else 1347 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE; 1348 1349 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1350 if (port_priv->rts) 1351 flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL; 1352 else 1353 flow_repl |= CP210X_SERIAL_RTS_INACTIVE; 1354 1355 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1356 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1357 1358 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", 1359 __func__, ctl_hs, flow_repl); 1360 1361 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1362 sizeof(flow_ctl)); 1363 } else { 1364 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control); 1365 1366 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1367 } 1368 out_unlock: 1369 mutex_unlock(&port_priv->mutex); 1370 1371 return ret; 1372 } 1373 1374 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1375 { 1376 if (on) 1377 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1378 else 1379 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1380 } 1381 1382 static int cp210x_tiocmget(struct tty_struct *tty) 1383 { 1384 struct usb_serial_port *port = tty->driver_data; 1385 u8 control; 1386 int result; 1387 1388 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1389 if (result) 1390 return result; 1391 1392 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1393 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1394 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1395 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1396 |((control & CONTROL_RING)? TIOCM_RI : 0) 1397 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1398 1399 dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control); 1400 1401 return result; 1402 } 1403 1404 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1405 { 1406 struct usb_serial_port *port = tty->driver_data; 1407 u16 state; 1408 1409 if (break_state == 0) 1410 state = BREAK_OFF; 1411 else 1412 state = BREAK_ON; 1413 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1414 state == BREAK_OFF ? "off" : "on"); 1415 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1416 } 1417 1418 #ifdef CONFIG_GPIOLIB 1419 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1420 { 1421 struct usb_serial *serial = gpiochip_get_data(gc); 1422 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1423 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1424 int result; 1425 u8 buf; 1426 1427 if (priv->partnum == CP210X_PARTNUM_CP2105) 1428 req_type = REQTYPE_INTERFACE_TO_HOST; 1429 1430 result = usb_autopm_get_interface(serial->interface); 1431 if (result) 1432 return result; 1433 1434 result = cp210x_read_vendor_block(serial, req_type, 1435 CP210X_READ_LATCH, &buf, sizeof(buf)); 1436 usb_autopm_put_interface(serial->interface); 1437 if (result < 0) 1438 return result; 1439 1440 return !!(buf & BIT(gpio)); 1441 } 1442 1443 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1444 { 1445 struct usb_serial *serial = gpiochip_get_data(gc); 1446 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1447 struct cp210x_gpio_write buf; 1448 int result; 1449 1450 if (value == 1) 1451 buf.state = BIT(gpio); 1452 else 1453 buf.state = 0; 1454 1455 buf.mask = BIT(gpio); 1456 1457 result = usb_autopm_get_interface(serial->interface); 1458 if (result) 1459 goto out; 1460 1461 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1462 result = cp210x_write_vendor_block(serial, 1463 REQTYPE_HOST_TO_INTERFACE, 1464 CP210X_WRITE_LATCH, &buf, 1465 sizeof(buf)); 1466 } else { 1467 u16 wIndex = buf.state << 8 | buf.mask; 1468 1469 result = usb_control_msg(serial->dev, 1470 usb_sndctrlpipe(serial->dev, 0), 1471 CP210X_VENDOR_SPECIFIC, 1472 REQTYPE_HOST_TO_DEVICE, 1473 CP210X_WRITE_LATCH, 1474 wIndex, 1475 NULL, 0, USB_CTRL_SET_TIMEOUT); 1476 } 1477 1478 usb_autopm_put_interface(serial->interface); 1479 out: 1480 if (result < 0) { 1481 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1482 result); 1483 } 1484 } 1485 1486 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1487 { 1488 struct usb_serial *serial = gpiochip_get_data(gc); 1489 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1490 1491 return priv->gpio_input & BIT(gpio); 1492 } 1493 1494 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1495 { 1496 struct usb_serial *serial = gpiochip_get_data(gc); 1497 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1498 1499 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1500 /* hardware does not support an input mode */ 1501 return -ENOTSUPP; 1502 } 1503 1504 /* push-pull pins cannot be changed to be inputs */ 1505 if (priv->gpio_pushpull & BIT(gpio)) 1506 return -EINVAL; 1507 1508 /* make sure to release pin if it is being driven low */ 1509 cp210x_gpio_set(gc, gpio, 1); 1510 1511 priv->gpio_input |= BIT(gpio); 1512 1513 return 0; 1514 } 1515 1516 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1517 int value) 1518 { 1519 struct usb_serial *serial = gpiochip_get_data(gc); 1520 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1521 1522 priv->gpio_input &= ~BIT(gpio); 1523 cp210x_gpio_set(gc, gpio, value); 1524 1525 return 0; 1526 } 1527 1528 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1529 unsigned long config) 1530 { 1531 struct usb_serial *serial = gpiochip_get_data(gc); 1532 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1533 enum pin_config_param param = pinconf_to_config_param(config); 1534 1535 /* Succeed only if in correct mode (this can't be set at runtime) */ 1536 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1537 (priv->gpio_pushpull & BIT(gpio))) 1538 return 0; 1539 1540 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1541 !(priv->gpio_pushpull & BIT(gpio))) 1542 return 0; 1543 1544 return -ENOTSUPP; 1545 } 1546 1547 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc, 1548 unsigned long *valid_mask, unsigned int ngpios) 1549 { 1550 struct usb_serial *serial = gpiochip_get_data(gc); 1551 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1552 struct device *dev = &serial->interface->dev; 1553 unsigned long altfunc_mask = priv->gpio_altfunc; 1554 1555 bitmap_complement(valid_mask, &altfunc_mask, ngpios); 1556 1557 if (bitmap_empty(valid_mask, ngpios)) 1558 dev_dbg(dev, "no pin configured for GPIO\n"); 1559 else 1560 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios, 1561 valid_mask); 1562 return 0; 1563 } 1564 1565 /* 1566 * This function is for configuring GPIO using shared pins, where other signals 1567 * are made unavailable by configuring the use of GPIO. This is believed to be 1568 * only applicable to the cp2105 at this point, the other devices supported by 1569 * this driver that provide GPIO do so in a way that does not impact other 1570 * signals and are thus expected to have very different initialisation. 1571 */ 1572 static int cp2105_gpioconf_init(struct usb_serial *serial) 1573 { 1574 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1575 struct cp210x_pin_mode mode; 1576 struct cp210x_dual_port_config config; 1577 u8 intf_num = cp210x_interface_num(serial); 1578 u8 iface_config; 1579 int result; 1580 1581 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1582 CP210X_GET_DEVICEMODE, &mode, 1583 sizeof(mode)); 1584 if (result < 0) 1585 return result; 1586 1587 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1588 CP210X_GET_PORTCONFIG, &config, 1589 sizeof(config)); 1590 if (result < 0) 1591 return result; 1592 1593 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1594 if (intf_num == 0) { 1595 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1596 /* mark all GPIOs of this interface as reserved */ 1597 priv->gpio_altfunc = 0xff; 1598 return 0; 1599 } 1600 1601 iface_config = config.eci_cfg; 1602 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1603 CP210X_ECI_GPIO_MODE_MASK) >> 1604 CP210X_ECI_GPIO_MODE_OFFSET); 1605 priv->gc.ngpio = 2; 1606 } else if (intf_num == 1) { 1607 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1608 /* mark all GPIOs of this interface as reserved */ 1609 priv->gpio_altfunc = 0xff; 1610 return 0; 1611 } 1612 1613 iface_config = config.sci_cfg; 1614 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1615 CP210X_SCI_GPIO_MODE_MASK) >> 1616 CP210X_SCI_GPIO_MODE_OFFSET); 1617 priv->gc.ngpio = 3; 1618 } else { 1619 return -ENODEV; 1620 } 1621 1622 /* mark all pins which are not in GPIO mode */ 1623 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1624 priv->gpio_altfunc |= BIT(0); 1625 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1626 CP2105_GPIO1_RS485_MODE)) 1627 priv->gpio_altfunc |= BIT(1); 1628 1629 /* driver implementation for CP2105 only supports outputs */ 1630 priv->gpio_input = 0; 1631 1632 return 0; 1633 } 1634 1635 static int cp2104_gpioconf_init(struct usb_serial *serial) 1636 { 1637 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1638 struct cp210x_single_port_config config; 1639 u8 iface_config; 1640 u8 gpio_latch; 1641 int result; 1642 u8 i; 1643 1644 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1645 CP210X_GET_PORTCONFIG, &config, 1646 sizeof(config)); 1647 if (result < 0) 1648 return result; 1649 1650 priv->gc.ngpio = 4; 1651 1652 iface_config = config.device_cfg; 1653 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1654 CP210X_GPIO_MODE_MASK) >> 1655 CP210X_GPIO_MODE_OFFSET); 1656 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1657 CP210X_GPIO_MODE_MASK) >> 1658 CP210X_GPIO_MODE_OFFSET); 1659 1660 /* mark all pins which are not in GPIO mode */ 1661 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1662 priv->gpio_altfunc |= BIT(0); 1663 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1664 priv->gpio_altfunc |= BIT(1); 1665 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1666 priv->gpio_altfunc |= BIT(2); 1667 1668 /* 1669 * Like CP2102N, CP2104 has also no strict input and output pin 1670 * modes. 1671 * Do the same input mode emulation as CP2102N. 1672 */ 1673 for (i = 0; i < priv->gc.ngpio; ++i) { 1674 /* 1675 * Set direction to "input" iff pin is open-drain and reset 1676 * value is 1. 1677 */ 1678 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1679 priv->gpio_input |= BIT(i); 1680 } 1681 1682 return 0; 1683 } 1684 1685 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1686 { 1687 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1688 const u16 config_size = 0x02a6; 1689 u8 gpio_rst_latch; 1690 u8 config_version; 1691 u8 gpio_pushpull; 1692 u8 *config_buf; 1693 u8 gpio_latch; 1694 u8 gpio_ctrl; 1695 int result; 1696 u8 i; 1697 1698 /* 1699 * Retrieve device configuration from the device. 1700 * The array received contains all customization settings done at the 1701 * factory/manufacturer. Format of the array is documented at the 1702 * time of writing at: 1703 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1704 */ 1705 config_buf = kmalloc(config_size, GFP_KERNEL); 1706 if (!config_buf) 1707 return -ENOMEM; 1708 1709 result = cp210x_read_vendor_block(serial, 1710 REQTYPE_DEVICE_TO_HOST, 1711 CP210X_READ_2NCONFIG, 1712 config_buf, 1713 config_size); 1714 if (result < 0) { 1715 kfree(config_buf); 1716 return result; 1717 } 1718 1719 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1720 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1721 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1722 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1723 1724 kfree(config_buf); 1725 1726 /* Make sure this is a config format we understand. */ 1727 if (config_version != 0x01) 1728 return -ENOTSUPP; 1729 1730 priv->gc.ngpio = 4; 1731 1732 /* 1733 * Get default pin states after reset. Needed so we can determine 1734 * the direction of an open-drain pin. 1735 */ 1736 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1737 1738 /* 0 indicates open-drain mode, 1 is push-pull */ 1739 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1740 1741 /* 0 indicates GPIO mode, 1 is alternate function */ 1742 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) { 1743 /* QFN20 is special... */ 1744 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */ 1745 priv->gpio_altfunc |= BIT(0); 1746 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */ 1747 priv->gpio_altfunc |= BIT(1); 1748 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */ 1749 priv->gpio_altfunc |= BIT(2); 1750 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */ 1751 priv->gpio_altfunc |= BIT(3); 1752 } else { 1753 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1754 } 1755 1756 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1757 /* 1758 * For the QFN28 package, GPIO4-6 are controlled by 1759 * the low three bits of the mode/latch fields. 1760 * Contrary to the document linked above, the bits for 1761 * the SUSPEND pins are elsewhere. No alternate 1762 * function is available for these pins. 1763 */ 1764 priv->gc.ngpio = 7; 1765 gpio_latch |= (gpio_rst_latch & 7) << 4; 1766 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1767 } 1768 1769 /* 1770 * The CP2102N does not strictly has input and output pin modes, 1771 * it only knows open-drain and push-pull modes which is set at 1772 * factory. An open-drain pin can function both as an 1773 * input or an output. We emulate input mode for open-drain pins 1774 * by making sure they are not driven low, and we do not allow 1775 * push-pull pins to be set as an input. 1776 */ 1777 for (i = 0; i < priv->gc.ngpio; ++i) { 1778 /* 1779 * Set direction to "input" iff pin is open-drain and reset 1780 * value is 1. 1781 */ 1782 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1783 priv->gpio_input |= BIT(i); 1784 } 1785 1786 return 0; 1787 } 1788 1789 static int cp210x_gpio_init(struct usb_serial *serial) 1790 { 1791 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1792 int result; 1793 1794 switch (priv->partnum) { 1795 case CP210X_PARTNUM_CP2104: 1796 result = cp2104_gpioconf_init(serial); 1797 break; 1798 case CP210X_PARTNUM_CP2105: 1799 result = cp2105_gpioconf_init(serial); 1800 break; 1801 case CP210X_PARTNUM_CP2102N_QFN28: 1802 case CP210X_PARTNUM_CP2102N_QFN24: 1803 case CP210X_PARTNUM_CP2102N_QFN20: 1804 result = cp2102n_gpioconf_init(serial); 1805 break; 1806 default: 1807 return 0; 1808 } 1809 1810 if (result < 0) 1811 return result; 1812 1813 priv->gc.label = "cp210x"; 1814 priv->gc.get_direction = cp210x_gpio_direction_get; 1815 priv->gc.direction_input = cp210x_gpio_direction_input; 1816 priv->gc.direction_output = cp210x_gpio_direction_output; 1817 priv->gc.get = cp210x_gpio_get; 1818 priv->gc.set = cp210x_gpio_set; 1819 priv->gc.set_config = cp210x_gpio_set_config; 1820 priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask; 1821 priv->gc.owner = THIS_MODULE; 1822 priv->gc.parent = &serial->interface->dev; 1823 priv->gc.base = -1; 1824 priv->gc.can_sleep = true; 1825 1826 result = gpiochip_add_data(&priv->gc, serial); 1827 if (!result) 1828 priv->gpio_registered = true; 1829 1830 return result; 1831 } 1832 1833 static void cp210x_gpio_remove(struct usb_serial *serial) 1834 { 1835 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1836 1837 if (priv->gpio_registered) { 1838 gpiochip_remove(&priv->gc); 1839 priv->gpio_registered = false; 1840 } 1841 } 1842 1843 #else 1844 1845 static int cp210x_gpio_init(struct usb_serial *serial) 1846 { 1847 return 0; 1848 } 1849 1850 static void cp210x_gpio_remove(struct usb_serial *serial) 1851 { 1852 /* Nothing to do */ 1853 } 1854 1855 #endif 1856 1857 static int cp210x_port_probe(struct usb_serial_port *port) 1858 { 1859 struct usb_serial *serial = port->serial; 1860 struct cp210x_port_private *port_priv; 1861 1862 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1863 if (!port_priv) 1864 return -ENOMEM; 1865 1866 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1867 mutex_init(&port_priv->mutex); 1868 1869 usb_set_serial_port_data(port, port_priv); 1870 1871 return 0; 1872 } 1873 1874 static void cp210x_port_remove(struct usb_serial_port *port) 1875 { 1876 struct cp210x_port_private *port_priv; 1877 1878 port_priv = usb_get_serial_port_data(port); 1879 kfree(port_priv); 1880 } 1881 1882 static void cp210x_init_max_speed(struct usb_serial *serial) 1883 { 1884 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1885 bool use_actual_rate = false; 1886 speed_t min = 300; 1887 speed_t max; 1888 1889 switch (priv->partnum) { 1890 case CP210X_PARTNUM_CP2101: 1891 max = 921600; 1892 break; 1893 case CP210X_PARTNUM_CP2102: 1894 case CP210X_PARTNUM_CP2103: 1895 max = 1000000; 1896 break; 1897 case CP210X_PARTNUM_CP2104: 1898 use_actual_rate = true; 1899 max = 2000000; 1900 break; 1901 case CP210X_PARTNUM_CP2108: 1902 max = 2000000; 1903 break; 1904 case CP210X_PARTNUM_CP2105: 1905 if (cp210x_interface_num(serial) == 0) { 1906 use_actual_rate = true; 1907 max = 2000000; /* ECI */ 1908 } else { 1909 min = 2400; 1910 max = 921600; /* SCI */ 1911 } 1912 break; 1913 case CP210X_PARTNUM_CP2102N_QFN28: 1914 case CP210X_PARTNUM_CP2102N_QFN24: 1915 case CP210X_PARTNUM_CP2102N_QFN20: 1916 use_actual_rate = true; 1917 max = 3000000; 1918 break; 1919 default: 1920 max = 2000000; 1921 break; 1922 } 1923 1924 priv->min_speed = min; 1925 priv->max_speed = max; 1926 priv->use_actual_rate = use_actual_rate; 1927 } 1928 1929 static int cp210x_attach(struct usb_serial *serial) 1930 { 1931 int result; 1932 struct cp210x_serial_private *priv; 1933 1934 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1935 if (!priv) 1936 return -ENOMEM; 1937 1938 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1939 CP210X_GET_PARTNUM, &priv->partnum, 1940 sizeof(priv->partnum)); 1941 if (result < 0) { 1942 dev_warn(&serial->interface->dev, 1943 "querying part number failed\n"); 1944 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1945 } 1946 1947 usb_set_serial_data(serial, priv); 1948 1949 cp210x_init_max_speed(serial); 1950 1951 result = cp210x_gpio_init(serial); 1952 if (result < 0) { 1953 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1954 result); 1955 } 1956 1957 return 0; 1958 } 1959 1960 static void cp210x_disconnect(struct usb_serial *serial) 1961 { 1962 cp210x_gpio_remove(serial); 1963 } 1964 1965 static void cp210x_release(struct usb_serial *serial) 1966 { 1967 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1968 1969 cp210x_gpio_remove(serial); 1970 1971 kfree(priv); 1972 } 1973 1974 module_usb_serial_driver(serial_drivers, id_table); 1975 1976 MODULE_DESCRIPTION(DRIVER_DESC); 1977 MODULE_LICENSE("GPL v2"); 1978