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 * 7 * Support to set flow control line levels using TIOCMGET and TIOCMSET 8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 9 * control thanks to Munir Nassar nassarmu@real-time.com 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/tty.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/usb.h> 21 #include <linux/uaccess.h> 22 #include <linux/usb/serial.h> 23 #include <linux/gpio/driver.h> 24 #include <linux/bitops.h> 25 #include <linux/mutex.h> 26 27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 28 29 /* 30 * Function Prototypes 31 */ 32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 33 static void cp210x_close(struct usb_serial_port *); 34 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 35 struct ktermios *); 36 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 37 struct ktermios*); 38 static bool cp210x_tx_empty(struct usb_serial_port *port); 39 static int cp210x_tiocmget(struct tty_struct *); 40 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 41 static int cp210x_tiocmset_port(struct usb_serial_port *port, 42 unsigned int, unsigned int); 43 static void cp210x_break_ctl(struct tty_struct *, int); 44 static int cp210x_attach(struct usb_serial *); 45 static void cp210x_disconnect(struct usb_serial *); 46 static void cp210x_release(struct usb_serial *); 47 static int cp210x_port_probe(struct usb_serial_port *); 48 static int cp210x_port_remove(struct usb_serial_port *); 49 static void cp210x_dtr_rts(struct usb_serial_port *port, int on); 50 static void cp210x_process_read_urb(struct urb *urb); 51 static void cp210x_enable_event_mode(struct usb_serial_port *port); 52 static void cp210x_disable_event_mode(struct usb_serial_port *port); 53 54 static const struct usb_device_id id_table[] = { 55 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 56 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 57 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 58 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 59 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 60 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 61 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 62 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 63 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 64 { USB_DEVICE(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(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 205 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 206 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 207 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 208 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 209 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 210 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 211 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 212 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 213 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 214 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 215 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 216 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 217 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 218 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 219 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 220 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 221 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 227 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 228 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 229 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 230 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 231 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 232 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 233 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 234 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 235 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 236 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 237 { } /* Terminating Entry */ 238 }; 239 240 MODULE_DEVICE_TABLE(usb, id_table); 241 242 struct cp210x_serial_private { 243 #ifdef CONFIG_GPIOLIB 244 struct gpio_chip gc; 245 bool gpio_registered; 246 u8 gpio_pushpull; 247 u8 gpio_altfunc; 248 u8 gpio_input; 249 #endif 250 u8 partnum; 251 speed_t min_speed; 252 speed_t max_speed; 253 bool use_actual_rate; 254 }; 255 256 enum cp210x_event_state { 257 ES_DATA, 258 ES_ESCAPE, 259 ES_LSR, 260 ES_LSR_DATA_0, 261 ES_LSR_DATA_1, 262 ES_MSR 263 }; 264 265 struct cp210x_port_private { 266 u8 bInterfaceNumber; 267 bool event_mode; 268 enum cp210x_event_state event_state; 269 u8 lsr; 270 }; 271 272 static struct usb_serial_driver cp210x_device = { 273 .driver = { 274 .owner = THIS_MODULE, 275 .name = "cp210x", 276 }, 277 .id_table = id_table, 278 .num_ports = 1, 279 .bulk_in_size = 256, 280 .bulk_out_size = 256, 281 .open = cp210x_open, 282 .close = cp210x_close, 283 .break_ctl = cp210x_break_ctl, 284 .set_termios = cp210x_set_termios, 285 .tx_empty = cp210x_tx_empty, 286 .throttle = usb_serial_generic_throttle, 287 .unthrottle = usb_serial_generic_unthrottle, 288 .tiocmget = cp210x_tiocmget, 289 .tiocmset = cp210x_tiocmset, 290 .get_icount = usb_serial_generic_get_icount, 291 .attach = cp210x_attach, 292 .disconnect = cp210x_disconnect, 293 .release = cp210x_release, 294 .port_probe = cp210x_port_probe, 295 .port_remove = cp210x_port_remove, 296 .dtr_rts = cp210x_dtr_rts, 297 .process_read_urb = cp210x_process_read_urb, 298 }; 299 300 static struct usb_serial_driver * const serial_drivers[] = { 301 &cp210x_device, NULL 302 }; 303 304 /* Config request types */ 305 #define REQTYPE_HOST_TO_INTERFACE 0x41 306 #define REQTYPE_INTERFACE_TO_HOST 0xc1 307 #define REQTYPE_HOST_TO_DEVICE 0x40 308 #define REQTYPE_DEVICE_TO_HOST 0xc0 309 310 /* Config request codes */ 311 #define CP210X_IFC_ENABLE 0x00 312 #define CP210X_SET_BAUDDIV 0x01 313 #define CP210X_GET_BAUDDIV 0x02 314 #define CP210X_SET_LINE_CTL 0x03 315 #define CP210X_GET_LINE_CTL 0x04 316 #define CP210X_SET_BREAK 0x05 317 #define CP210X_IMM_CHAR 0x06 318 #define CP210X_SET_MHS 0x07 319 #define CP210X_GET_MDMSTS 0x08 320 #define CP210X_SET_XON 0x09 321 #define CP210X_SET_XOFF 0x0A 322 #define CP210X_SET_EVENTMASK 0x0B 323 #define CP210X_GET_EVENTMASK 0x0C 324 #define CP210X_SET_CHAR 0x0D 325 #define CP210X_GET_CHARS 0x0E 326 #define CP210X_GET_PROPS 0x0F 327 #define CP210X_GET_COMM_STATUS 0x10 328 #define CP210X_RESET 0x11 329 #define CP210X_PURGE 0x12 330 #define CP210X_SET_FLOW 0x13 331 #define CP210X_GET_FLOW 0x14 332 #define CP210X_EMBED_EVENTS 0x15 333 #define CP210X_GET_EVENTSTATE 0x16 334 #define CP210X_SET_CHARS 0x19 335 #define CP210X_GET_BAUDRATE 0x1D 336 #define CP210X_SET_BAUDRATE 0x1E 337 #define CP210X_VENDOR_SPECIFIC 0xFF 338 339 /* CP210X_IFC_ENABLE */ 340 #define UART_ENABLE 0x0001 341 #define UART_DISABLE 0x0000 342 343 /* CP210X_(SET|GET)_BAUDDIV */ 344 #define BAUD_RATE_GEN_FREQ 0x384000 345 346 /* CP210X_(SET|GET)_LINE_CTL */ 347 #define BITS_DATA_MASK 0X0f00 348 #define BITS_DATA_5 0X0500 349 #define BITS_DATA_6 0X0600 350 #define BITS_DATA_7 0X0700 351 #define BITS_DATA_8 0X0800 352 #define BITS_DATA_9 0X0900 353 354 #define BITS_PARITY_MASK 0x00f0 355 #define BITS_PARITY_NONE 0x0000 356 #define BITS_PARITY_ODD 0x0010 357 #define BITS_PARITY_EVEN 0x0020 358 #define BITS_PARITY_MARK 0x0030 359 #define BITS_PARITY_SPACE 0x0040 360 361 #define BITS_STOP_MASK 0x000f 362 #define BITS_STOP_1 0x0000 363 #define BITS_STOP_1_5 0x0001 364 #define BITS_STOP_2 0x0002 365 366 /* CP210X_SET_BREAK */ 367 #define BREAK_ON 0x0001 368 #define BREAK_OFF 0x0000 369 370 /* CP210X_(SET_MHS|GET_MDMSTS) */ 371 #define CONTROL_DTR 0x0001 372 #define CONTROL_RTS 0x0002 373 #define CONTROL_CTS 0x0010 374 #define CONTROL_DSR 0x0020 375 #define CONTROL_RING 0x0040 376 #define CONTROL_DCD 0x0080 377 #define CONTROL_WRITE_DTR 0x0100 378 #define CONTROL_WRITE_RTS 0x0200 379 380 /* CP210X_(GET|SET)_CHARS */ 381 struct cp210x_special_chars { 382 u8 bEofChar; 383 u8 bErrorChar; 384 u8 bBreakChar; 385 u8 bEventChar; 386 u8 bXonChar; 387 u8 bXoffChar; 388 }; 389 390 /* CP210X_VENDOR_SPECIFIC values */ 391 #define CP210X_READ_2NCONFIG 0x000E 392 #define CP210X_READ_LATCH 0x00C2 393 #define CP210X_GET_PARTNUM 0x370B 394 #define CP210X_GET_PORTCONFIG 0x370C 395 #define CP210X_GET_DEVICEMODE 0x3711 396 #define CP210X_WRITE_LATCH 0x37E1 397 398 /* Part number definitions */ 399 #define CP210X_PARTNUM_CP2101 0x01 400 #define CP210X_PARTNUM_CP2102 0x02 401 #define CP210X_PARTNUM_CP2103 0x03 402 #define CP210X_PARTNUM_CP2104 0x04 403 #define CP210X_PARTNUM_CP2105 0x05 404 #define CP210X_PARTNUM_CP2108 0x08 405 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 406 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 407 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 408 #define CP210X_PARTNUM_UNKNOWN 0xFF 409 410 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 411 struct cp210x_comm_status { 412 __le32 ulErrors; 413 __le32 ulHoldReasons; 414 __le32 ulAmountInInQueue; 415 __le32 ulAmountInOutQueue; 416 u8 bEofReceived; 417 u8 bWaitForImmediate; 418 u8 bReserved; 419 } __packed; 420 421 /* 422 * CP210X_PURGE - 16 bits passed in wValue of USB request. 423 * SiLabs app note AN571 gives a strange description of the 4 bits: 424 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 425 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 426 */ 427 #define PURGE_ALL 0x000f 428 429 /* CP210X_EMBED_EVENTS */ 430 #define CP210X_ESCCHAR 0xec 431 432 #define CP210X_LSR_OVERRUN BIT(1) 433 #define CP210X_LSR_PARITY BIT(2) 434 #define CP210X_LSR_FRAME BIT(3) 435 #define CP210X_LSR_BREAK BIT(4) 436 437 438 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 439 struct cp210x_flow_ctl { 440 __le32 ulControlHandshake; 441 __le32 ulFlowReplace; 442 __le32 ulXonLimit; 443 __le32 ulXoffLimit; 444 }; 445 446 /* cp210x_flow_ctl::ulControlHandshake */ 447 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 448 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 449 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 450 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 451 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 452 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 453 454 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 455 #define CP210X_SERIAL_DTR_INACTIVE 0 456 #define CP210X_SERIAL_DTR_ACTIVE 1 457 #define CP210X_SERIAL_DTR_FLOW_CTL 2 458 459 /* cp210x_flow_ctl::ulFlowReplace */ 460 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 461 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 462 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 463 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 464 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 465 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 466 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 467 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 468 469 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 470 #define CP210X_SERIAL_RTS_INACTIVE 0 471 #define CP210X_SERIAL_RTS_ACTIVE 1 472 #define CP210X_SERIAL_RTS_FLOW_CTL 2 473 474 /* 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 == bufsize) { 678 result = 0; 679 } else { 680 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 681 req, bufsize, result); 682 if (result >= 0) 683 result = -EIO; 684 } 685 686 return result; 687 } 688 689 /* 690 * Writes any 32-bit CP210X_ register identified by req. 691 */ 692 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 693 { 694 __le32 le32_val; 695 696 le32_val = cpu_to_le32(val); 697 698 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 699 } 700 701 #ifdef CONFIG_GPIOLIB 702 /* 703 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 704 * Data in buf must be in native USB byte order. 705 */ 706 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 707 u16 val, void *buf, int bufsize) 708 { 709 void *dmabuf; 710 int result; 711 712 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 713 if (!dmabuf) 714 return -ENOMEM; 715 716 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 717 CP210X_VENDOR_SPECIFIC, type, val, 718 cp210x_interface_num(serial), dmabuf, bufsize, 719 USB_CTRL_SET_TIMEOUT); 720 721 kfree(dmabuf); 722 723 if (result == bufsize) { 724 result = 0; 725 } else { 726 dev_err(&serial->interface->dev, 727 "failed to set vendor val 0x%04x size %d: %d\n", val, 728 bufsize, result); 729 if (result >= 0) 730 result = -EIO; 731 } 732 733 return result; 734 } 735 #endif 736 737 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 738 { 739 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 740 int result; 741 742 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 743 if (result) { 744 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 745 return result; 746 } 747 748 if (tty) 749 cp210x_set_termios(tty, port, NULL); 750 751 result = usb_serial_generic_open(tty, port); 752 if (result) 753 goto err_disable; 754 755 return 0; 756 757 err_disable: 758 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 759 port_priv->event_mode = false; 760 761 return result; 762 } 763 764 static void cp210x_close(struct usb_serial_port *port) 765 { 766 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 767 768 usb_serial_generic_close(port); 769 770 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 771 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 772 773 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 774 775 /* Disabling the interface disables event-insertion mode. */ 776 port_priv->event_mode = false; 777 } 778 779 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 780 { 781 if (lsr & CP210X_LSR_BREAK) { 782 port->icount.brk++; 783 *flag = TTY_BREAK; 784 } else if (lsr & CP210X_LSR_PARITY) { 785 port->icount.parity++; 786 *flag = TTY_PARITY; 787 } else if (lsr & CP210X_LSR_FRAME) { 788 port->icount.frame++; 789 *flag = TTY_FRAME; 790 } 791 792 if (lsr & CP210X_LSR_OVERRUN) { 793 port->icount.overrun++; 794 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 795 } 796 } 797 798 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 799 { 800 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 801 802 switch (port_priv->event_state) { 803 case ES_DATA: 804 if (*ch == CP210X_ESCCHAR) { 805 port_priv->event_state = ES_ESCAPE; 806 break; 807 } 808 return false; 809 case ES_ESCAPE: 810 switch (*ch) { 811 case 0: 812 dev_dbg(&port->dev, "%s - escape char\n", __func__); 813 *ch = CP210X_ESCCHAR; 814 port_priv->event_state = ES_DATA; 815 return false; 816 case 1: 817 port_priv->event_state = ES_LSR_DATA_0; 818 break; 819 case 2: 820 port_priv->event_state = ES_LSR; 821 break; 822 case 3: 823 port_priv->event_state = ES_MSR; 824 break; 825 default: 826 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 827 port_priv->event_state = ES_DATA; 828 break; 829 } 830 break; 831 case ES_LSR_DATA_0: 832 port_priv->lsr = *ch; 833 port_priv->event_state = ES_LSR_DATA_1; 834 break; 835 case ES_LSR_DATA_1: 836 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 837 __func__, port_priv->lsr, *ch); 838 cp210x_process_lsr(port, port_priv->lsr, flag); 839 port_priv->event_state = ES_DATA; 840 return false; 841 case ES_LSR: 842 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 843 port_priv->lsr = *ch; 844 cp210x_process_lsr(port, port_priv->lsr, flag); 845 port_priv->event_state = ES_DATA; 846 break; 847 case ES_MSR: 848 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 849 /* unimplemented */ 850 port_priv->event_state = ES_DATA; 851 break; 852 } 853 854 return true; 855 } 856 857 static void cp210x_process_read_urb(struct urb *urb) 858 { 859 struct usb_serial_port *port = urb->context; 860 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 861 unsigned char *ch = urb->transfer_buffer; 862 char flag; 863 int i; 864 865 if (!urb->actual_length) 866 return; 867 868 if (port_priv->event_mode) { 869 for (i = 0; i < urb->actual_length; i++, ch++) { 870 flag = TTY_NORMAL; 871 872 if (cp210x_process_char(port, ch, &flag)) 873 continue; 874 875 tty_insert_flip_char(&port->port, *ch, flag); 876 } 877 } else { 878 tty_insert_flip_string(&port->port, ch, urb->actual_length); 879 } 880 tty_flip_buffer_push(&port->port); 881 } 882 883 /* 884 * Read how many bytes are waiting in the TX queue. 885 */ 886 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 887 u32 *count) 888 { 889 struct usb_serial *serial = port->serial; 890 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 891 struct cp210x_comm_status *sts; 892 int result; 893 894 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 895 if (!sts) 896 return -ENOMEM; 897 898 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 899 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 900 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 901 USB_CTRL_GET_TIMEOUT); 902 if (result == sizeof(*sts)) { 903 *count = le32_to_cpu(sts->ulAmountInOutQueue); 904 result = 0; 905 } else { 906 dev_err(&port->dev, "failed to get comm status: %d\n", result); 907 if (result >= 0) 908 result = -EIO; 909 } 910 911 kfree(sts); 912 913 return result; 914 } 915 916 static bool cp210x_tx_empty(struct usb_serial_port *port) 917 { 918 int err; 919 u32 count; 920 921 err = cp210x_get_tx_queue_byte_count(port, &count); 922 if (err) 923 return true; 924 925 return !count; 926 } 927 928 struct cp210x_rate { 929 speed_t rate; 930 speed_t high; 931 }; 932 933 static const struct cp210x_rate cp210x_an205_table1[] = { 934 { 300, 300 }, 935 { 600, 600 }, 936 { 1200, 1200 }, 937 { 1800, 1800 }, 938 { 2400, 2400 }, 939 { 4000, 4000 }, 940 { 4800, 4803 }, 941 { 7200, 7207 }, 942 { 9600, 9612 }, 943 { 14400, 14428 }, 944 { 16000, 16062 }, 945 { 19200, 19250 }, 946 { 28800, 28912 }, 947 { 38400, 38601 }, 948 { 51200, 51558 }, 949 { 56000, 56280 }, 950 { 57600, 58053 }, 951 { 64000, 64111 }, 952 { 76800, 77608 }, 953 { 115200, 117028 }, 954 { 128000, 129347 }, 955 { 153600, 156868 }, 956 { 230400, 237832 }, 957 { 250000, 254234 }, 958 { 256000, 273066 }, 959 { 460800, 491520 }, 960 { 500000, 567138 }, 961 { 576000, 670254 }, 962 { 921600, UINT_MAX } 963 }; 964 965 /* 966 * Quantises the baud rate as per AN205 Table 1 967 */ 968 static speed_t cp210x_get_an205_rate(speed_t baud) 969 { 970 int i; 971 972 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 973 if (baud <= cp210x_an205_table1[i].high) 974 break; 975 } 976 977 return cp210x_an205_table1[i].rate; 978 } 979 980 static speed_t cp210x_get_actual_rate(speed_t baud) 981 { 982 unsigned int prescale = 1; 983 unsigned int div; 984 985 if (baud <= 365) 986 prescale = 4; 987 988 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 989 baud = 48000000 / (2 * prescale * div); 990 991 return baud; 992 } 993 994 /* 995 * CP2101 supports the following baud rates: 996 * 997 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 998 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 999 * 1000 * CP2102 and CP2103 support the following additional rates: 1001 * 1002 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1003 * 576000 1004 * 1005 * The device will map a requested rate to a supported one, but the result 1006 * of requests for rates greater than 1053257 is undefined (see AN205). 1007 * 1008 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1009 * respectively, with an error less than 1%. The actual rates are determined 1010 * by 1011 * 1012 * div = round(freq / (2 x prescale x request)) 1013 * actual = freq / (2 x prescale x div) 1014 * 1015 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1016 * or 1 otherwise. 1017 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1018 * otherwise. 1019 */ 1020 static void cp210x_change_speed(struct tty_struct *tty, 1021 struct usb_serial_port *port, struct ktermios *old_termios) 1022 { 1023 struct usb_serial *serial = port->serial; 1024 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1025 u32 baud; 1026 1027 /* 1028 * This maps the requested rate to the actual rate, a valid rate on 1029 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1030 * 1031 * NOTE: B0 is not implemented. 1032 */ 1033 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1034 1035 if (priv->use_actual_rate) 1036 baud = cp210x_get_actual_rate(baud); 1037 else if (baud < 1000000) 1038 baud = cp210x_get_an205_rate(baud); 1039 1040 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1041 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1042 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1043 if (old_termios) 1044 baud = old_termios->c_ospeed; 1045 else 1046 baud = 9600; 1047 } 1048 1049 tty_encode_baud_rate(tty, baud, baud); 1050 } 1051 1052 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1053 { 1054 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1055 int ret; 1056 1057 if (port_priv->event_mode) 1058 return; 1059 1060 port_priv->event_state = ES_DATA; 1061 port_priv->event_mode = true; 1062 1063 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1064 if (ret) { 1065 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1066 port_priv->event_mode = false; 1067 } 1068 } 1069 1070 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1071 { 1072 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1073 int ret; 1074 1075 if (!port_priv->event_mode) 1076 return; 1077 1078 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1079 if (ret) { 1080 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1081 return; 1082 } 1083 1084 port_priv->event_mode = false; 1085 } 1086 1087 static int cp210x_set_chars(struct usb_serial_port *port, 1088 struct cp210x_special_chars *chars) 1089 { 1090 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1091 struct usb_serial *serial = port->serial; 1092 void *dmabuf; 1093 int result; 1094 1095 dmabuf = kmemdup(chars, sizeof(*chars), GFP_KERNEL); 1096 if (!dmabuf) 1097 return -ENOMEM; 1098 1099 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 1100 CP210X_SET_CHARS, REQTYPE_HOST_TO_INTERFACE, 0, 1101 port_priv->bInterfaceNumber, 1102 dmabuf, sizeof(*chars), USB_CTRL_SET_TIMEOUT); 1103 1104 kfree(dmabuf); 1105 1106 if (result < 0) { 1107 dev_err(&port->dev, "failed to set special chars: %d\n", result); 1108 return result; 1109 } 1110 1111 return 0; 1112 } 1113 1114 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1115 { 1116 bool iflag_change; 1117 1118 iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF)); 1119 1120 return tty_termios_hw_change(a, b) || iflag_change; 1121 } 1122 1123 static void cp210x_set_flow_control(struct tty_struct *tty, 1124 struct usb_serial_port *port, struct ktermios *old_termios) 1125 { 1126 struct cp210x_special_chars chars; 1127 struct cp210x_flow_ctl flow_ctl; 1128 u32 flow_repl; 1129 u32 ctl_hs; 1130 int ret; 1131 1132 if (old_termios && 1133 C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) && 1134 I_IXON(tty) == (old_termios->c_iflag & IXON) && 1135 I_IXOFF(tty) == (old_termios->c_iflag & IXOFF)) { 1136 return; 1137 } 1138 1139 if (I_IXON(tty) || I_IXOFF(tty)) { 1140 memset(&chars, 0, sizeof(chars)); 1141 1142 chars.bXonChar = START_CHAR(tty); 1143 chars.bXoffChar = STOP_CHAR(tty); 1144 1145 ret = cp210x_set_chars(port, &chars); 1146 if (ret) 1147 return; 1148 } 1149 1150 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1151 sizeof(flow_ctl)); 1152 if (ret) 1153 return; 1154 1155 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1156 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1157 1158 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1159 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1160 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1161 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1162 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1163 1164 if (C_CRTSCTS(tty)) { 1165 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1166 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1167 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); 1168 } else { 1169 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1170 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1171 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_ACTIVE); 1172 } 1173 1174 if (I_IXOFF(tty)) 1175 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE; 1176 else 1177 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE; 1178 1179 if (I_IXON(tty)) 1180 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT; 1181 else 1182 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT; 1183 1184 flow_ctl.ulXonLimit = cpu_to_le32(128); 1185 flow_ctl.ulXoffLimit = cpu_to_le32(128); 1186 1187 dev_dbg(&port->dev, "%s - ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1188 __func__, ctl_hs, flow_repl); 1189 1190 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1191 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1192 1193 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1194 sizeof(flow_ctl)); 1195 } 1196 1197 static void cp210x_set_termios(struct tty_struct *tty, 1198 struct usb_serial_port *port, struct ktermios *old_termios) 1199 { 1200 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1201 u16 bits; 1202 int ret; 1203 1204 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1205 return; 1206 1207 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1208 cp210x_change_speed(tty, port, old_termios); 1209 1210 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1211 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1212 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1213 tty->termios.c_cflag |= CS8; 1214 } 1215 1216 bits = 0; 1217 1218 switch (C_CSIZE(tty)) { 1219 case CS5: 1220 bits |= BITS_DATA_5; 1221 break; 1222 case CS6: 1223 bits |= BITS_DATA_6; 1224 break; 1225 case CS7: 1226 bits |= BITS_DATA_7; 1227 break; 1228 case CS8: 1229 default: 1230 bits |= BITS_DATA_8; 1231 break; 1232 } 1233 1234 if (C_PARENB(tty)) { 1235 if (C_CMSPAR(tty)) { 1236 if (C_PARODD(tty)) 1237 bits |= BITS_PARITY_MARK; 1238 else 1239 bits |= BITS_PARITY_SPACE; 1240 } else { 1241 if (C_PARODD(tty)) 1242 bits |= BITS_PARITY_ODD; 1243 else 1244 bits |= BITS_PARITY_EVEN; 1245 } 1246 } 1247 1248 if (C_CSTOPB(tty)) 1249 bits |= BITS_STOP_2; 1250 else 1251 bits |= BITS_STOP_1; 1252 1253 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1254 if (ret) 1255 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1256 1257 cp210x_set_flow_control(tty, port, old_termios); 1258 1259 /* 1260 * Enable event-insertion mode only if input parity checking is 1261 * enabled for now. 1262 */ 1263 if (I_INPCK(tty)) 1264 cp210x_enable_event_mode(port); 1265 else 1266 cp210x_disable_event_mode(port); 1267 } 1268 1269 static int cp210x_tiocmset(struct tty_struct *tty, 1270 unsigned int set, unsigned int clear) 1271 { 1272 struct usb_serial_port *port = tty->driver_data; 1273 return cp210x_tiocmset_port(port, set, clear); 1274 } 1275 1276 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1277 unsigned int set, unsigned int clear) 1278 { 1279 u16 control = 0; 1280 1281 if (set & TIOCM_RTS) { 1282 control |= CONTROL_RTS; 1283 control |= CONTROL_WRITE_RTS; 1284 } 1285 if (set & TIOCM_DTR) { 1286 control |= CONTROL_DTR; 1287 control |= CONTROL_WRITE_DTR; 1288 } 1289 if (clear & TIOCM_RTS) { 1290 control &= ~CONTROL_RTS; 1291 control |= CONTROL_WRITE_RTS; 1292 } 1293 if (clear & TIOCM_DTR) { 1294 control &= ~CONTROL_DTR; 1295 control |= CONTROL_WRITE_DTR; 1296 } 1297 1298 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1299 1300 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1301 } 1302 1303 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1304 { 1305 if (on) 1306 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1307 else 1308 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1309 } 1310 1311 static int cp210x_tiocmget(struct tty_struct *tty) 1312 { 1313 struct usb_serial_port *port = tty->driver_data; 1314 u8 control; 1315 int result; 1316 1317 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1318 if (result) 1319 return result; 1320 1321 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1322 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1323 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1324 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1325 |((control & CONTROL_RING)? TIOCM_RI : 0) 1326 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1327 1328 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1329 1330 return result; 1331 } 1332 1333 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1334 { 1335 struct usb_serial_port *port = tty->driver_data; 1336 u16 state; 1337 1338 if (break_state == 0) 1339 state = BREAK_OFF; 1340 else 1341 state = BREAK_ON; 1342 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1343 state == BREAK_OFF ? "off" : "on"); 1344 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1345 } 1346 1347 #ifdef CONFIG_GPIOLIB 1348 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1349 { 1350 struct usb_serial *serial = gpiochip_get_data(gc); 1351 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1352 1353 if (priv->gpio_altfunc & BIT(offset)) 1354 return -ENODEV; 1355 1356 return 0; 1357 } 1358 1359 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1360 { 1361 struct usb_serial *serial = gpiochip_get_data(gc); 1362 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1363 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1364 int result; 1365 u8 buf; 1366 1367 if (priv->partnum == CP210X_PARTNUM_CP2105) 1368 req_type = REQTYPE_INTERFACE_TO_HOST; 1369 1370 result = usb_autopm_get_interface(serial->interface); 1371 if (result) 1372 return result; 1373 1374 result = cp210x_read_vendor_block(serial, req_type, 1375 CP210X_READ_LATCH, &buf, sizeof(buf)); 1376 usb_autopm_put_interface(serial->interface); 1377 if (result < 0) 1378 return result; 1379 1380 return !!(buf & BIT(gpio)); 1381 } 1382 1383 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1384 { 1385 struct usb_serial *serial = gpiochip_get_data(gc); 1386 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1387 struct cp210x_gpio_write buf; 1388 int result; 1389 1390 if (value == 1) 1391 buf.state = BIT(gpio); 1392 else 1393 buf.state = 0; 1394 1395 buf.mask = BIT(gpio); 1396 1397 result = usb_autopm_get_interface(serial->interface); 1398 if (result) 1399 goto out; 1400 1401 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1402 result = cp210x_write_vendor_block(serial, 1403 REQTYPE_HOST_TO_INTERFACE, 1404 CP210X_WRITE_LATCH, &buf, 1405 sizeof(buf)); 1406 } else { 1407 u16 wIndex = buf.state << 8 | buf.mask; 1408 1409 result = usb_control_msg(serial->dev, 1410 usb_sndctrlpipe(serial->dev, 0), 1411 CP210X_VENDOR_SPECIFIC, 1412 REQTYPE_HOST_TO_DEVICE, 1413 CP210X_WRITE_LATCH, 1414 wIndex, 1415 NULL, 0, USB_CTRL_SET_TIMEOUT); 1416 } 1417 1418 usb_autopm_put_interface(serial->interface); 1419 out: 1420 if (result < 0) { 1421 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1422 result); 1423 } 1424 } 1425 1426 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1427 { 1428 struct usb_serial *serial = gpiochip_get_data(gc); 1429 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1430 1431 return priv->gpio_input & BIT(gpio); 1432 } 1433 1434 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1435 { 1436 struct usb_serial *serial = gpiochip_get_data(gc); 1437 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1438 1439 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1440 /* hardware does not support an input mode */ 1441 return -ENOTSUPP; 1442 } 1443 1444 /* push-pull pins cannot be changed to be inputs */ 1445 if (priv->gpio_pushpull & BIT(gpio)) 1446 return -EINVAL; 1447 1448 /* make sure to release pin if it is being driven low */ 1449 cp210x_gpio_set(gc, gpio, 1); 1450 1451 priv->gpio_input |= BIT(gpio); 1452 1453 return 0; 1454 } 1455 1456 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1457 int value) 1458 { 1459 struct usb_serial *serial = gpiochip_get_data(gc); 1460 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1461 1462 priv->gpio_input &= ~BIT(gpio); 1463 cp210x_gpio_set(gc, gpio, value); 1464 1465 return 0; 1466 } 1467 1468 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1469 unsigned long config) 1470 { 1471 struct usb_serial *serial = gpiochip_get_data(gc); 1472 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1473 enum pin_config_param param = pinconf_to_config_param(config); 1474 1475 /* Succeed only if in correct mode (this can't be set at runtime) */ 1476 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1477 (priv->gpio_pushpull & BIT(gpio))) 1478 return 0; 1479 1480 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1481 !(priv->gpio_pushpull & BIT(gpio))) 1482 return 0; 1483 1484 return -ENOTSUPP; 1485 } 1486 1487 /* 1488 * This function is for configuring GPIO using shared pins, where other signals 1489 * are made unavailable by configuring the use of GPIO. This is believed to be 1490 * only applicable to the cp2105 at this point, the other devices supported by 1491 * this driver that provide GPIO do so in a way that does not impact other 1492 * signals and are thus expected to have very different initialisation. 1493 */ 1494 static int cp2105_gpioconf_init(struct usb_serial *serial) 1495 { 1496 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1497 struct cp210x_pin_mode mode; 1498 struct cp210x_dual_port_config config; 1499 u8 intf_num = cp210x_interface_num(serial); 1500 u8 iface_config; 1501 int result; 1502 1503 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1504 CP210X_GET_DEVICEMODE, &mode, 1505 sizeof(mode)); 1506 if (result < 0) 1507 return result; 1508 1509 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1510 CP210X_GET_PORTCONFIG, &config, 1511 sizeof(config)); 1512 if (result < 0) 1513 return result; 1514 1515 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1516 if (intf_num == 0) { 1517 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1518 /* mark all GPIOs of this interface as reserved */ 1519 priv->gpio_altfunc = 0xff; 1520 return 0; 1521 } 1522 1523 iface_config = config.eci_cfg; 1524 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1525 CP210X_ECI_GPIO_MODE_MASK) >> 1526 CP210X_ECI_GPIO_MODE_OFFSET); 1527 priv->gc.ngpio = 2; 1528 } else if (intf_num == 1) { 1529 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1530 /* mark all GPIOs of this interface as reserved */ 1531 priv->gpio_altfunc = 0xff; 1532 return 0; 1533 } 1534 1535 iface_config = config.sci_cfg; 1536 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1537 CP210X_SCI_GPIO_MODE_MASK) >> 1538 CP210X_SCI_GPIO_MODE_OFFSET); 1539 priv->gc.ngpio = 3; 1540 } else { 1541 return -ENODEV; 1542 } 1543 1544 /* mark all pins which are not in GPIO mode */ 1545 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1546 priv->gpio_altfunc |= BIT(0); 1547 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1548 CP2105_GPIO1_RS485_MODE)) 1549 priv->gpio_altfunc |= BIT(1); 1550 1551 /* driver implementation for CP2105 only supports outputs */ 1552 priv->gpio_input = 0; 1553 1554 return 0; 1555 } 1556 1557 static int cp2104_gpioconf_init(struct usb_serial *serial) 1558 { 1559 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1560 struct cp210x_single_port_config config; 1561 u8 iface_config; 1562 u8 gpio_latch; 1563 int result; 1564 u8 i; 1565 1566 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1567 CP210X_GET_PORTCONFIG, &config, 1568 sizeof(config)); 1569 if (result < 0) 1570 return result; 1571 1572 priv->gc.ngpio = 4; 1573 1574 iface_config = config.device_cfg; 1575 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1576 CP210X_GPIO_MODE_MASK) >> 1577 CP210X_GPIO_MODE_OFFSET); 1578 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1579 CP210X_GPIO_MODE_MASK) >> 1580 CP210X_GPIO_MODE_OFFSET); 1581 1582 /* mark all pins which are not in GPIO mode */ 1583 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1584 priv->gpio_altfunc |= BIT(0); 1585 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1586 priv->gpio_altfunc |= BIT(1); 1587 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1588 priv->gpio_altfunc |= BIT(2); 1589 1590 /* 1591 * Like CP2102N, CP2104 has also no strict input and output pin 1592 * modes. 1593 * Do the same input mode emulation as CP2102N. 1594 */ 1595 for (i = 0; i < priv->gc.ngpio; ++i) { 1596 /* 1597 * Set direction to "input" iff pin is open-drain and reset 1598 * value is 1. 1599 */ 1600 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1601 priv->gpio_input |= BIT(i); 1602 } 1603 1604 return 0; 1605 } 1606 1607 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1608 { 1609 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1610 const u16 config_size = 0x02a6; 1611 u8 gpio_rst_latch; 1612 u8 config_version; 1613 u8 gpio_pushpull; 1614 u8 *config_buf; 1615 u8 gpio_latch; 1616 u8 gpio_ctrl; 1617 int result; 1618 u8 i; 1619 1620 /* 1621 * Retrieve device configuration from the device. 1622 * The array received contains all customization settings done at the 1623 * factory/manufacturer. Format of the array is documented at the 1624 * time of writing at: 1625 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1626 */ 1627 config_buf = kmalloc(config_size, GFP_KERNEL); 1628 if (!config_buf) 1629 return -ENOMEM; 1630 1631 result = cp210x_read_vendor_block(serial, 1632 REQTYPE_DEVICE_TO_HOST, 1633 CP210X_READ_2NCONFIG, 1634 config_buf, 1635 config_size); 1636 if (result < 0) { 1637 kfree(config_buf); 1638 return result; 1639 } 1640 1641 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1642 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1643 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1644 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1645 1646 kfree(config_buf); 1647 1648 /* Make sure this is a config format we understand. */ 1649 if (config_version != 0x01) 1650 return -ENOTSUPP; 1651 1652 priv->gc.ngpio = 4; 1653 1654 /* 1655 * Get default pin states after reset. Needed so we can determine 1656 * the direction of an open-drain pin. 1657 */ 1658 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1659 1660 /* 0 indicates open-drain mode, 1 is push-pull */ 1661 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1662 1663 /* 0 indicates GPIO mode, 1 is alternate function */ 1664 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1665 1666 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1667 /* 1668 * For the QFN28 package, GPIO4-6 are controlled by 1669 * the low three bits of the mode/latch fields. 1670 * Contrary to the document linked above, the bits for 1671 * the SUSPEND pins are elsewhere. No alternate 1672 * function is available for these pins. 1673 */ 1674 priv->gc.ngpio = 7; 1675 gpio_latch |= (gpio_rst_latch & 7) << 4; 1676 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1677 } 1678 1679 /* 1680 * The CP2102N does not strictly has input and output pin modes, 1681 * it only knows open-drain and push-pull modes which is set at 1682 * factory. An open-drain pin can function both as an 1683 * input or an output. We emulate input mode for open-drain pins 1684 * by making sure they are not driven low, and we do not allow 1685 * push-pull pins to be set as an input. 1686 */ 1687 for (i = 0; i < priv->gc.ngpio; ++i) { 1688 /* 1689 * Set direction to "input" iff pin is open-drain and reset 1690 * value is 1. 1691 */ 1692 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1693 priv->gpio_input |= BIT(i); 1694 } 1695 1696 return 0; 1697 } 1698 1699 static int cp210x_gpio_init(struct usb_serial *serial) 1700 { 1701 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1702 int result; 1703 1704 switch (priv->partnum) { 1705 case CP210X_PARTNUM_CP2104: 1706 result = cp2104_gpioconf_init(serial); 1707 break; 1708 case CP210X_PARTNUM_CP2105: 1709 result = cp2105_gpioconf_init(serial); 1710 break; 1711 case CP210X_PARTNUM_CP2102N_QFN28: 1712 case CP210X_PARTNUM_CP2102N_QFN24: 1713 case CP210X_PARTNUM_CP2102N_QFN20: 1714 result = cp2102n_gpioconf_init(serial); 1715 break; 1716 default: 1717 return 0; 1718 } 1719 1720 if (result < 0) 1721 return result; 1722 1723 priv->gc.label = "cp210x"; 1724 priv->gc.request = cp210x_gpio_request; 1725 priv->gc.get_direction = cp210x_gpio_direction_get; 1726 priv->gc.direction_input = cp210x_gpio_direction_input; 1727 priv->gc.direction_output = cp210x_gpio_direction_output; 1728 priv->gc.get = cp210x_gpio_get; 1729 priv->gc.set = cp210x_gpio_set; 1730 priv->gc.set_config = cp210x_gpio_set_config; 1731 priv->gc.owner = THIS_MODULE; 1732 priv->gc.parent = &serial->interface->dev; 1733 priv->gc.base = -1; 1734 priv->gc.can_sleep = true; 1735 1736 result = gpiochip_add_data(&priv->gc, serial); 1737 if (!result) 1738 priv->gpio_registered = true; 1739 1740 return result; 1741 } 1742 1743 static void cp210x_gpio_remove(struct usb_serial *serial) 1744 { 1745 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1746 1747 if (priv->gpio_registered) { 1748 gpiochip_remove(&priv->gc); 1749 priv->gpio_registered = false; 1750 } 1751 } 1752 1753 #else 1754 1755 static int cp210x_gpio_init(struct usb_serial *serial) 1756 { 1757 return 0; 1758 } 1759 1760 static void cp210x_gpio_remove(struct usb_serial *serial) 1761 { 1762 /* Nothing to do */ 1763 } 1764 1765 #endif 1766 1767 static int cp210x_port_probe(struct usb_serial_port *port) 1768 { 1769 struct usb_serial *serial = port->serial; 1770 struct cp210x_port_private *port_priv; 1771 1772 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1773 if (!port_priv) 1774 return -ENOMEM; 1775 1776 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1777 1778 usb_set_serial_port_data(port, port_priv); 1779 1780 return 0; 1781 } 1782 1783 static int cp210x_port_remove(struct usb_serial_port *port) 1784 { 1785 struct cp210x_port_private *port_priv; 1786 1787 port_priv = usb_get_serial_port_data(port); 1788 kfree(port_priv); 1789 1790 return 0; 1791 } 1792 1793 static void cp210x_init_max_speed(struct usb_serial *serial) 1794 { 1795 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1796 bool use_actual_rate = false; 1797 speed_t min = 300; 1798 speed_t max; 1799 1800 switch (priv->partnum) { 1801 case CP210X_PARTNUM_CP2101: 1802 max = 921600; 1803 break; 1804 case CP210X_PARTNUM_CP2102: 1805 case CP210X_PARTNUM_CP2103: 1806 max = 1000000; 1807 break; 1808 case CP210X_PARTNUM_CP2104: 1809 use_actual_rate = true; 1810 max = 2000000; 1811 break; 1812 case CP210X_PARTNUM_CP2108: 1813 max = 2000000; 1814 break; 1815 case CP210X_PARTNUM_CP2105: 1816 if (cp210x_interface_num(serial) == 0) { 1817 use_actual_rate = true; 1818 max = 2000000; /* ECI */ 1819 } else { 1820 min = 2400; 1821 max = 921600; /* SCI */ 1822 } 1823 break; 1824 case CP210X_PARTNUM_CP2102N_QFN28: 1825 case CP210X_PARTNUM_CP2102N_QFN24: 1826 case CP210X_PARTNUM_CP2102N_QFN20: 1827 use_actual_rate = true; 1828 max = 3000000; 1829 break; 1830 default: 1831 max = 2000000; 1832 break; 1833 } 1834 1835 priv->min_speed = min; 1836 priv->max_speed = max; 1837 priv->use_actual_rate = use_actual_rate; 1838 } 1839 1840 static int cp210x_attach(struct usb_serial *serial) 1841 { 1842 int result; 1843 struct cp210x_serial_private *priv; 1844 1845 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1846 if (!priv) 1847 return -ENOMEM; 1848 1849 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1850 CP210X_GET_PARTNUM, &priv->partnum, 1851 sizeof(priv->partnum)); 1852 if (result < 0) { 1853 dev_warn(&serial->interface->dev, 1854 "querying part number failed\n"); 1855 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1856 } 1857 1858 usb_set_serial_data(serial, priv); 1859 1860 cp210x_init_max_speed(serial); 1861 1862 result = cp210x_gpio_init(serial); 1863 if (result < 0) { 1864 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1865 result); 1866 } 1867 1868 return 0; 1869 } 1870 1871 static void cp210x_disconnect(struct usb_serial *serial) 1872 { 1873 cp210x_gpio_remove(serial); 1874 } 1875 1876 static void cp210x_release(struct usb_serial *serial) 1877 { 1878 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1879 1880 cp210x_gpio_remove(serial); 1881 1882 kfree(priv); 1883 } 1884 1885 module_usb_serial_driver(serial_drivers, id_table); 1886 1887 MODULE_DESCRIPTION(DRIVER_DESC); 1888 MODULE_LICENSE("GPL v2"); 1889