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(0x0988, 0x0578) }, /* Teraoka AD2000 */ 65 { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */ 66 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 67 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 68 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 70 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 71 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 72 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 73 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 74 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 75 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 76 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 77 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 78 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 79 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 80 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 81 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 82 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 83 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 84 { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */ 85 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 86 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 87 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 88 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 89 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 90 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 91 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 92 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 93 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 94 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 95 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 96 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 97 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 98 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 99 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 100 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 101 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 104 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 105 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 106 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 107 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 108 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 109 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 110 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 111 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 112 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 113 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 114 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 115 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 116 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 117 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 118 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 119 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 120 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 121 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 122 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 123 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 124 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 125 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 126 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 127 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 128 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 129 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 130 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 131 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 132 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 133 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 134 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 135 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 136 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 137 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 138 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 139 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 140 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 141 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 142 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 143 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 144 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 145 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 146 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 147 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 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(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 206 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 207 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 208 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 209 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 210 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 211 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 212 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 213 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 214 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 215 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 216 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 217 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 218 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 219 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 220 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 221 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 222 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 227 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 228 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 229 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 230 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 231 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 232 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 233 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 234 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 235 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 236 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 237 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 238 { } /* Terminating Entry */ 239 }; 240 241 MODULE_DEVICE_TABLE(usb, id_table); 242 243 struct cp210x_serial_private { 244 #ifdef CONFIG_GPIOLIB 245 struct gpio_chip gc; 246 bool gpio_registered; 247 u8 gpio_pushpull; 248 u8 gpio_altfunc; 249 u8 gpio_input; 250 #endif 251 u8 partnum; 252 speed_t min_speed; 253 speed_t max_speed; 254 bool use_actual_rate; 255 }; 256 257 enum cp210x_event_state { 258 ES_DATA, 259 ES_ESCAPE, 260 ES_LSR, 261 ES_LSR_DATA_0, 262 ES_LSR_DATA_1, 263 ES_MSR 264 }; 265 266 struct cp210x_port_private { 267 u8 bInterfaceNumber; 268 bool event_mode; 269 enum cp210x_event_state event_state; 270 u8 lsr; 271 }; 272 273 static struct usb_serial_driver cp210x_device = { 274 .driver = { 275 .owner = THIS_MODULE, 276 .name = "cp210x", 277 }, 278 .id_table = id_table, 279 .num_ports = 1, 280 .bulk_in_size = 256, 281 .bulk_out_size = 256, 282 .open = cp210x_open, 283 .close = cp210x_close, 284 .break_ctl = cp210x_break_ctl, 285 .set_termios = cp210x_set_termios, 286 .tx_empty = cp210x_tx_empty, 287 .throttle = usb_serial_generic_throttle, 288 .unthrottle = usb_serial_generic_unthrottle, 289 .tiocmget = cp210x_tiocmget, 290 .tiocmset = cp210x_tiocmset, 291 .get_icount = usb_serial_generic_get_icount, 292 .attach = cp210x_attach, 293 .disconnect = cp210x_disconnect, 294 .release = cp210x_release, 295 .port_probe = cp210x_port_probe, 296 .port_remove = cp210x_port_remove, 297 .dtr_rts = cp210x_dtr_rts, 298 .process_read_urb = cp210x_process_read_urb, 299 }; 300 301 static struct usb_serial_driver * const serial_drivers[] = { 302 &cp210x_device, NULL 303 }; 304 305 /* Config request types */ 306 #define REQTYPE_HOST_TO_INTERFACE 0x41 307 #define REQTYPE_INTERFACE_TO_HOST 0xc1 308 #define REQTYPE_HOST_TO_DEVICE 0x40 309 #define REQTYPE_DEVICE_TO_HOST 0xc0 310 311 /* Config request codes */ 312 #define CP210X_IFC_ENABLE 0x00 313 #define CP210X_SET_BAUDDIV 0x01 314 #define CP210X_GET_BAUDDIV 0x02 315 #define CP210X_SET_LINE_CTL 0x03 316 #define CP210X_GET_LINE_CTL 0x04 317 #define CP210X_SET_BREAK 0x05 318 #define CP210X_IMM_CHAR 0x06 319 #define CP210X_SET_MHS 0x07 320 #define CP210X_GET_MDMSTS 0x08 321 #define CP210X_SET_XON 0x09 322 #define CP210X_SET_XOFF 0x0A 323 #define CP210X_SET_EVENTMASK 0x0B 324 #define CP210X_GET_EVENTMASK 0x0C 325 #define CP210X_SET_CHAR 0x0D 326 #define CP210X_GET_CHARS 0x0E 327 #define CP210X_GET_PROPS 0x0F 328 #define CP210X_GET_COMM_STATUS 0x10 329 #define CP210X_RESET 0x11 330 #define CP210X_PURGE 0x12 331 #define CP210X_SET_FLOW 0x13 332 #define CP210X_GET_FLOW 0x14 333 #define CP210X_EMBED_EVENTS 0x15 334 #define CP210X_GET_EVENTSTATE 0x16 335 #define CP210X_SET_CHARS 0x19 336 #define CP210X_GET_BAUDRATE 0x1D 337 #define CP210X_SET_BAUDRATE 0x1E 338 #define CP210X_VENDOR_SPECIFIC 0xFF 339 340 /* CP210X_IFC_ENABLE */ 341 #define UART_ENABLE 0x0001 342 #define UART_DISABLE 0x0000 343 344 /* CP210X_(SET|GET)_BAUDDIV */ 345 #define BAUD_RATE_GEN_FREQ 0x384000 346 347 /* CP210X_(SET|GET)_LINE_CTL */ 348 #define BITS_DATA_MASK 0X0f00 349 #define BITS_DATA_5 0X0500 350 #define BITS_DATA_6 0X0600 351 #define BITS_DATA_7 0X0700 352 #define BITS_DATA_8 0X0800 353 #define BITS_DATA_9 0X0900 354 355 #define BITS_PARITY_MASK 0x00f0 356 #define BITS_PARITY_NONE 0x0000 357 #define BITS_PARITY_ODD 0x0010 358 #define BITS_PARITY_EVEN 0x0020 359 #define BITS_PARITY_MARK 0x0030 360 #define BITS_PARITY_SPACE 0x0040 361 362 #define BITS_STOP_MASK 0x000f 363 #define BITS_STOP_1 0x0000 364 #define BITS_STOP_1_5 0x0001 365 #define BITS_STOP_2 0x0002 366 367 /* CP210X_SET_BREAK */ 368 #define BREAK_ON 0x0001 369 #define BREAK_OFF 0x0000 370 371 /* CP210X_(SET_MHS|GET_MDMSTS) */ 372 #define CONTROL_DTR 0x0001 373 #define CONTROL_RTS 0x0002 374 #define CONTROL_CTS 0x0010 375 #define CONTROL_DSR 0x0020 376 #define CONTROL_RING 0x0040 377 #define CONTROL_DCD 0x0080 378 #define CONTROL_WRITE_DTR 0x0100 379 #define CONTROL_WRITE_RTS 0x0200 380 381 /* CP210X_VENDOR_SPECIFIC values */ 382 #define CP210X_READ_2NCONFIG 0x000E 383 #define CP210X_READ_LATCH 0x00C2 384 #define CP210X_GET_PARTNUM 0x370B 385 #define CP210X_GET_PORTCONFIG 0x370C 386 #define CP210X_GET_DEVICEMODE 0x3711 387 #define CP210X_WRITE_LATCH 0x37E1 388 389 /* Part number definitions */ 390 #define CP210X_PARTNUM_CP2101 0x01 391 #define CP210X_PARTNUM_CP2102 0x02 392 #define CP210X_PARTNUM_CP2103 0x03 393 #define CP210X_PARTNUM_CP2104 0x04 394 #define CP210X_PARTNUM_CP2105 0x05 395 #define CP210X_PARTNUM_CP2108 0x08 396 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 397 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 398 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 399 #define CP210X_PARTNUM_UNKNOWN 0xFF 400 401 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 402 struct cp210x_comm_status { 403 __le32 ulErrors; 404 __le32 ulHoldReasons; 405 __le32 ulAmountInInQueue; 406 __le32 ulAmountInOutQueue; 407 u8 bEofReceived; 408 u8 bWaitForImmediate; 409 u8 bReserved; 410 } __packed; 411 412 /* 413 * CP210X_PURGE - 16 bits passed in wValue of USB request. 414 * SiLabs app note AN571 gives a strange description of the 4 bits: 415 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 416 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 417 */ 418 #define PURGE_ALL 0x000f 419 420 /* CP210X_EMBED_EVENTS */ 421 #define CP210X_ESCCHAR 0xec 422 423 #define CP210X_LSR_OVERRUN BIT(1) 424 #define CP210X_LSR_PARITY BIT(2) 425 #define CP210X_LSR_FRAME BIT(3) 426 #define CP210X_LSR_BREAK BIT(4) 427 428 429 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 430 struct cp210x_flow_ctl { 431 __le32 ulControlHandshake; 432 __le32 ulFlowReplace; 433 __le32 ulXonLimit; 434 __le32 ulXoffLimit; 435 }; 436 437 /* cp210x_flow_ctl::ulControlHandshake */ 438 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 439 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 440 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 441 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 442 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 443 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 444 445 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 446 #define CP210X_SERIAL_DTR_INACTIVE 0 447 #define CP210X_SERIAL_DTR_ACTIVE 1 448 #define CP210X_SERIAL_DTR_FLOW_CTL 2 449 450 /* cp210x_flow_ctl::ulFlowReplace */ 451 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 452 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 453 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 454 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 455 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 456 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 457 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 458 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 459 460 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 461 #define CP210X_SERIAL_RTS_INACTIVE 0 462 #define CP210X_SERIAL_RTS_ACTIVE 1 463 #define CP210X_SERIAL_RTS_FLOW_CTL 2 464 465 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 466 struct cp210x_pin_mode { 467 u8 eci; 468 u8 sci; 469 }; 470 471 #define CP210X_PIN_MODE_MODEM 0 472 #define CP210X_PIN_MODE_GPIO BIT(0) 473 474 /* 475 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 476 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 477 */ 478 struct cp210x_dual_port_config { 479 __le16 gpio_mode; 480 u8 __pad0[2]; 481 __le16 reset_state; 482 u8 __pad1[4]; 483 __le16 suspend_state; 484 u8 sci_cfg; 485 u8 eci_cfg; 486 u8 device_cfg; 487 } __packed; 488 489 /* 490 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 491 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 492 */ 493 struct cp210x_single_port_config { 494 __le16 gpio_mode; 495 u8 __pad0[2]; 496 __le16 reset_state; 497 u8 __pad1[4]; 498 __le16 suspend_state; 499 u8 device_cfg; 500 } __packed; 501 502 /* GPIO modes */ 503 #define CP210X_SCI_GPIO_MODE_OFFSET 9 504 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 505 506 #define CP210X_ECI_GPIO_MODE_OFFSET 2 507 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 508 509 #define CP210X_GPIO_MODE_OFFSET 8 510 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 511 512 /* CP2105 port configuration values */ 513 #define CP2105_GPIO0_TXLED_MODE BIT(0) 514 #define CP2105_GPIO1_RXLED_MODE BIT(1) 515 #define CP2105_GPIO1_RS485_MODE BIT(2) 516 517 /* CP2104 port configuration values */ 518 #define CP2104_GPIO0_TXLED_MODE BIT(0) 519 #define CP2104_GPIO1_RXLED_MODE BIT(1) 520 #define CP2104_GPIO2_RS485_MODE BIT(2) 521 522 /* CP2102N configuration array indices */ 523 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 524 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 525 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 526 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 527 528 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 529 struct cp210x_gpio_write { 530 u8 mask; 531 u8 state; 532 }; 533 534 /* 535 * Helper to get interface number when we only have struct usb_serial. 536 */ 537 static u8 cp210x_interface_num(struct usb_serial *serial) 538 { 539 struct usb_host_interface *cur_altsetting; 540 541 cur_altsetting = serial->interface->cur_altsetting; 542 543 return cur_altsetting->desc.bInterfaceNumber; 544 } 545 546 /* 547 * Reads a variable-sized block of CP210X_ registers, identified by req. 548 * Returns data into buf in native USB byte order. 549 */ 550 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 551 void *buf, int bufsize) 552 { 553 struct usb_serial *serial = port->serial; 554 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 555 void *dmabuf; 556 int result; 557 558 dmabuf = kmalloc(bufsize, GFP_KERNEL); 559 if (!dmabuf) 560 return -ENOMEM; 561 562 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 563 req, REQTYPE_INTERFACE_TO_HOST, 0, 564 port_priv->bInterfaceNumber, dmabuf, bufsize, 565 USB_CTRL_SET_TIMEOUT); 566 if (result == bufsize) { 567 memcpy(buf, dmabuf, bufsize); 568 result = 0; 569 } else { 570 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 571 req, bufsize, result); 572 if (result >= 0) 573 result = -EIO; 574 } 575 576 kfree(dmabuf); 577 578 return result; 579 } 580 581 /* 582 * Reads any 8-bit CP210X_ register identified by req. 583 */ 584 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 585 { 586 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 587 } 588 589 /* 590 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 591 * Returns data into buf in native USB byte order. 592 */ 593 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 594 void *buf, int bufsize) 595 { 596 void *dmabuf; 597 int result; 598 599 dmabuf = kmalloc(bufsize, GFP_KERNEL); 600 if (!dmabuf) 601 return -ENOMEM; 602 603 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 604 CP210X_VENDOR_SPECIFIC, type, val, 605 cp210x_interface_num(serial), dmabuf, bufsize, 606 USB_CTRL_GET_TIMEOUT); 607 if (result == bufsize) { 608 memcpy(buf, dmabuf, bufsize); 609 result = 0; 610 } else { 611 dev_err(&serial->interface->dev, 612 "failed to get vendor val 0x%04x size %d: %d\n", val, 613 bufsize, result); 614 if (result >= 0) 615 result = -EIO; 616 } 617 618 kfree(dmabuf); 619 620 return result; 621 } 622 623 /* 624 * Writes any 16-bit CP210X_ register (req) whose value is passed 625 * entirely in the wValue field of the USB request. 626 */ 627 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 628 { 629 struct usb_serial *serial = port->serial; 630 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 631 int result; 632 633 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 634 req, REQTYPE_HOST_TO_INTERFACE, val, 635 port_priv->bInterfaceNumber, NULL, 0, 636 USB_CTRL_SET_TIMEOUT); 637 if (result < 0) { 638 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 639 req, result); 640 } 641 642 return result; 643 } 644 645 /* 646 * Writes a variable-sized block of CP210X_ registers, identified by req. 647 * Data in buf must be in native USB byte order. 648 */ 649 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 650 void *buf, int bufsize) 651 { 652 struct usb_serial *serial = port->serial; 653 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 654 void *dmabuf; 655 int result; 656 657 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 658 if (!dmabuf) 659 return -ENOMEM; 660 661 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 662 req, REQTYPE_HOST_TO_INTERFACE, 0, 663 port_priv->bInterfaceNumber, dmabuf, bufsize, 664 USB_CTRL_SET_TIMEOUT); 665 666 kfree(dmabuf); 667 668 if (result == bufsize) { 669 result = 0; 670 } else { 671 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 672 req, bufsize, result); 673 if (result >= 0) 674 result = -EIO; 675 } 676 677 return result; 678 } 679 680 /* 681 * Writes any 32-bit CP210X_ register identified by req. 682 */ 683 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 684 { 685 __le32 le32_val; 686 687 le32_val = cpu_to_le32(val); 688 689 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 690 } 691 692 #ifdef CONFIG_GPIOLIB 693 /* 694 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 695 * Data in buf must be in native USB byte order. 696 */ 697 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 698 u16 val, void *buf, int bufsize) 699 { 700 void *dmabuf; 701 int result; 702 703 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 704 if (!dmabuf) 705 return -ENOMEM; 706 707 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 708 CP210X_VENDOR_SPECIFIC, type, val, 709 cp210x_interface_num(serial), dmabuf, bufsize, 710 USB_CTRL_SET_TIMEOUT); 711 712 kfree(dmabuf); 713 714 if (result == bufsize) { 715 result = 0; 716 } else { 717 dev_err(&serial->interface->dev, 718 "failed to set vendor val 0x%04x size %d: %d\n", val, 719 bufsize, result); 720 if (result >= 0) 721 result = -EIO; 722 } 723 724 return result; 725 } 726 #endif 727 728 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 729 { 730 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 731 int result; 732 733 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 734 if (result) { 735 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 736 return result; 737 } 738 739 if (tty) 740 cp210x_set_termios(tty, port, NULL); 741 742 result = usb_serial_generic_open(tty, port); 743 if (result) 744 goto err_disable; 745 746 return 0; 747 748 err_disable: 749 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 750 port_priv->event_mode = false; 751 752 return result; 753 } 754 755 static void cp210x_close(struct usb_serial_port *port) 756 { 757 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 758 759 usb_serial_generic_close(port); 760 761 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 762 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 763 764 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 765 766 /* Disabling the interface disables event-insertion mode. */ 767 port_priv->event_mode = false; 768 } 769 770 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag) 771 { 772 if (lsr & CP210X_LSR_BREAK) { 773 port->icount.brk++; 774 *flag = TTY_BREAK; 775 } else if (lsr & CP210X_LSR_PARITY) { 776 port->icount.parity++; 777 *flag = TTY_PARITY; 778 } else if (lsr & CP210X_LSR_FRAME) { 779 port->icount.frame++; 780 *flag = TTY_FRAME; 781 } 782 783 if (lsr & CP210X_LSR_OVERRUN) { 784 port->icount.overrun++; 785 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 786 } 787 } 788 789 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag) 790 { 791 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 792 793 switch (port_priv->event_state) { 794 case ES_DATA: 795 if (*ch == CP210X_ESCCHAR) { 796 port_priv->event_state = ES_ESCAPE; 797 break; 798 } 799 return false; 800 case ES_ESCAPE: 801 switch (*ch) { 802 case 0: 803 dev_dbg(&port->dev, "%s - escape char\n", __func__); 804 *ch = CP210X_ESCCHAR; 805 port_priv->event_state = ES_DATA; 806 return false; 807 case 1: 808 port_priv->event_state = ES_LSR_DATA_0; 809 break; 810 case 2: 811 port_priv->event_state = ES_LSR; 812 break; 813 case 3: 814 port_priv->event_state = ES_MSR; 815 break; 816 default: 817 dev_err(&port->dev, "malformed event 0x%02x\n", *ch); 818 port_priv->event_state = ES_DATA; 819 break; 820 } 821 break; 822 case ES_LSR_DATA_0: 823 port_priv->lsr = *ch; 824 port_priv->event_state = ES_LSR_DATA_1; 825 break; 826 case ES_LSR_DATA_1: 827 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n", 828 __func__, port_priv->lsr, *ch); 829 cp210x_process_lsr(port, port_priv->lsr, flag); 830 port_priv->event_state = ES_DATA; 831 return false; 832 case ES_LSR: 833 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch); 834 port_priv->lsr = *ch; 835 cp210x_process_lsr(port, port_priv->lsr, flag); 836 port_priv->event_state = ES_DATA; 837 break; 838 case ES_MSR: 839 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch); 840 /* unimplemented */ 841 port_priv->event_state = ES_DATA; 842 break; 843 } 844 845 return true; 846 } 847 848 static void cp210x_process_read_urb(struct urb *urb) 849 { 850 struct usb_serial_port *port = urb->context; 851 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 852 unsigned char *ch = urb->transfer_buffer; 853 char flag; 854 int i; 855 856 if (!urb->actual_length) 857 return; 858 859 if (port_priv->event_mode) { 860 for (i = 0; i < urb->actual_length; i++, ch++) { 861 flag = TTY_NORMAL; 862 863 if (cp210x_process_char(port, ch, &flag)) 864 continue; 865 866 tty_insert_flip_char(&port->port, *ch, flag); 867 } 868 } else { 869 tty_insert_flip_string(&port->port, ch, urb->actual_length); 870 } 871 tty_flip_buffer_push(&port->port); 872 } 873 874 /* 875 * Read how many bytes are waiting in the TX queue. 876 */ 877 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 878 u32 *count) 879 { 880 struct usb_serial *serial = port->serial; 881 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 882 struct cp210x_comm_status *sts; 883 int result; 884 885 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 886 if (!sts) 887 return -ENOMEM; 888 889 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 890 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 891 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 892 USB_CTRL_GET_TIMEOUT); 893 if (result == sizeof(*sts)) { 894 *count = le32_to_cpu(sts->ulAmountInOutQueue); 895 result = 0; 896 } else { 897 dev_err(&port->dev, "failed to get comm status: %d\n", result); 898 if (result >= 0) 899 result = -EIO; 900 } 901 902 kfree(sts); 903 904 return result; 905 } 906 907 static bool cp210x_tx_empty(struct usb_serial_port *port) 908 { 909 int err; 910 u32 count; 911 912 err = cp210x_get_tx_queue_byte_count(port, &count); 913 if (err) 914 return true; 915 916 return !count; 917 } 918 919 struct cp210x_rate { 920 speed_t rate; 921 speed_t high; 922 }; 923 924 static const struct cp210x_rate cp210x_an205_table1[] = { 925 { 300, 300 }, 926 { 600, 600 }, 927 { 1200, 1200 }, 928 { 1800, 1800 }, 929 { 2400, 2400 }, 930 { 4000, 4000 }, 931 { 4800, 4803 }, 932 { 7200, 7207 }, 933 { 9600, 9612 }, 934 { 14400, 14428 }, 935 { 16000, 16062 }, 936 { 19200, 19250 }, 937 { 28800, 28912 }, 938 { 38400, 38601 }, 939 { 51200, 51558 }, 940 { 56000, 56280 }, 941 { 57600, 58053 }, 942 { 64000, 64111 }, 943 { 76800, 77608 }, 944 { 115200, 117028 }, 945 { 128000, 129347 }, 946 { 153600, 156868 }, 947 { 230400, 237832 }, 948 { 250000, 254234 }, 949 { 256000, 273066 }, 950 { 460800, 491520 }, 951 { 500000, 567138 }, 952 { 576000, 670254 }, 953 { 921600, UINT_MAX } 954 }; 955 956 /* 957 * Quantises the baud rate as per AN205 Table 1 958 */ 959 static speed_t cp210x_get_an205_rate(speed_t baud) 960 { 961 int i; 962 963 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 964 if (baud <= cp210x_an205_table1[i].high) 965 break; 966 } 967 968 return cp210x_an205_table1[i].rate; 969 } 970 971 static speed_t cp210x_get_actual_rate(speed_t baud) 972 { 973 unsigned int prescale = 1; 974 unsigned int div; 975 976 if (baud <= 365) 977 prescale = 4; 978 979 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 980 baud = 48000000 / (2 * prescale * div); 981 982 return baud; 983 } 984 985 /* 986 * CP2101 supports the following baud rates: 987 * 988 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 989 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 990 * 991 * CP2102 and CP2103 support the following additional rates: 992 * 993 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 994 * 576000 995 * 996 * The device will map a requested rate to a supported one, but the result 997 * of requests for rates greater than 1053257 is undefined (see AN205). 998 * 999 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1000 * respectively, with an error less than 1%. The actual rates are determined 1001 * by 1002 * 1003 * div = round(freq / (2 x prescale x request)) 1004 * actual = freq / (2 x prescale x div) 1005 * 1006 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1007 * or 1 otherwise. 1008 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1009 * otherwise. 1010 */ 1011 static void cp210x_change_speed(struct tty_struct *tty, 1012 struct usb_serial_port *port, struct ktermios *old_termios) 1013 { 1014 struct usb_serial *serial = port->serial; 1015 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1016 u32 baud; 1017 1018 /* 1019 * This maps the requested rate to the actual rate, a valid rate on 1020 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1021 * 1022 * NOTE: B0 is not implemented. 1023 */ 1024 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1025 1026 if (priv->use_actual_rate) 1027 baud = cp210x_get_actual_rate(baud); 1028 else if (baud < 1000000) 1029 baud = cp210x_get_an205_rate(baud); 1030 1031 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1032 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1033 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1034 if (old_termios) 1035 baud = old_termios->c_ospeed; 1036 else 1037 baud = 9600; 1038 } 1039 1040 tty_encode_baud_rate(tty, baud, baud); 1041 } 1042 1043 static void cp210x_enable_event_mode(struct usb_serial_port *port) 1044 { 1045 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1046 int ret; 1047 1048 if (port_priv->event_mode) 1049 return; 1050 1051 port_priv->event_state = ES_DATA; 1052 port_priv->event_mode = true; 1053 1054 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR); 1055 if (ret) { 1056 dev_err(&port->dev, "failed to enable events: %d\n", ret); 1057 port_priv->event_mode = false; 1058 } 1059 } 1060 1061 static void cp210x_disable_event_mode(struct usb_serial_port *port) 1062 { 1063 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 1064 int ret; 1065 1066 if (!port_priv->event_mode) 1067 return; 1068 1069 ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0); 1070 if (ret) { 1071 dev_err(&port->dev, "failed to disable events: %d\n", ret); 1072 return; 1073 } 1074 1075 port_priv->event_mode = false; 1076 } 1077 1078 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b) 1079 { 1080 bool iflag_change; 1081 1082 iflag_change = ((a->c_iflag ^ b->c_iflag) & INPCK); 1083 1084 return tty_termios_hw_change(a, b) || iflag_change; 1085 } 1086 1087 static void cp210x_set_flow_control(struct tty_struct *tty, 1088 struct usb_serial_port *port, struct ktermios *old_termios) 1089 { 1090 struct cp210x_flow_ctl flow_ctl; 1091 u32 flow_repl; 1092 u32 ctl_hs; 1093 int ret; 1094 1095 if (old_termios && C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS)) 1096 return; 1097 1098 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1099 sizeof(flow_ctl)); 1100 if (ret) 1101 return; 1102 1103 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1104 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1105 1106 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1107 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1108 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1109 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1110 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1111 1112 if (C_CRTSCTS(tty)) { 1113 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1114 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1115 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL); 1116 } else { 1117 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1118 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1119 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_ACTIVE); 1120 } 1121 1122 dev_dbg(&port->dev, "%s - ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1123 __func__, ctl_hs, flow_repl); 1124 1125 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1126 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1127 1128 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1129 sizeof(flow_ctl)); 1130 } 1131 1132 static void cp210x_set_termios(struct tty_struct *tty, 1133 struct usb_serial_port *port, struct ktermios *old_termios) 1134 { 1135 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); 1136 u16 bits; 1137 int ret; 1138 1139 if (old_termios && !cp210x_termios_change(&tty->termios, old_termios)) 1140 return; 1141 1142 if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed) 1143 cp210x_change_speed(tty, port, old_termios); 1144 1145 /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */ 1146 if (priv->partnum == CP210X_PARTNUM_CP2101) { 1147 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR); 1148 tty->termios.c_cflag |= CS8; 1149 } 1150 1151 bits = 0; 1152 1153 switch (C_CSIZE(tty)) { 1154 case CS5: 1155 bits |= BITS_DATA_5; 1156 break; 1157 case CS6: 1158 bits |= BITS_DATA_6; 1159 break; 1160 case CS7: 1161 bits |= BITS_DATA_7; 1162 break; 1163 case CS8: 1164 default: 1165 bits |= BITS_DATA_8; 1166 break; 1167 } 1168 1169 if (C_PARENB(tty)) { 1170 if (C_CMSPAR(tty)) { 1171 if (C_PARODD(tty)) 1172 bits |= BITS_PARITY_MARK; 1173 else 1174 bits |= BITS_PARITY_SPACE; 1175 } else { 1176 if (C_PARODD(tty)) 1177 bits |= BITS_PARITY_ODD; 1178 else 1179 bits |= BITS_PARITY_EVEN; 1180 } 1181 } 1182 1183 if (C_CSTOPB(tty)) 1184 bits |= BITS_STOP_2; 1185 else 1186 bits |= BITS_STOP_1; 1187 1188 ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1189 if (ret) 1190 dev_err(&port->dev, "failed to set line control: %d\n", ret); 1191 1192 cp210x_set_flow_control(tty, port, old_termios); 1193 1194 /* 1195 * Enable event-insertion mode only if input parity checking is 1196 * enabled for now. 1197 */ 1198 if (I_INPCK(tty)) 1199 cp210x_enable_event_mode(port); 1200 else 1201 cp210x_disable_event_mode(port); 1202 } 1203 1204 static int cp210x_tiocmset(struct tty_struct *tty, 1205 unsigned int set, unsigned int clear) 1206 { 1207 struct usb_serial_port *port = tty->driver_data; 1208 return cp210x_tiocmset_port(port, set, clear); 1209 } 1210 1211 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1212 unsigned int set, unsigned int clear) 1213 { 1214 u16 control = 0; 1215 1216 if (set & TIOCM_RTS) { 1217 control |= CONTROL_RTS; 1218 control |= CONTROL_WRITE_RTS; 1219 } 1220 if (set & TIOCM_DTR) { 1221 control |= CONTROL_DTR; 1222 control |= CONTROL_WRITE_DTR; 1223 } 1224 if (clear & TIOCM_RTS) { 1225 control &= ~CONTROL_RTS; 1226 control |= CONTROL_WRITE_RTS; 1227 } 1228 if (clear & TIOCM_DTR) { 1229 control &= ~CONTROL_DTR; 1230 control |= CONTROL_WRITE_DTR; 1231 } 1232 1233 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1234 1235 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1236 } 1237 1238 static void cp210x_dtr_rts(struct usb_serial_port *port, int on) 1239 { 1240 if (on) 1241 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0); 1242 else 1243 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS); 1244 } 1245 1246 static int cp210x_tiocmget(struct tty_struct *tty) 1247 { 1248 struct usb_serial_port *port = tty->driver_data; 1249 u8 control; 1250 int result; 1251 1252 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1253 if (result) 1254 return result; 1255 1256 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1257 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1258 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1259 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1260 |((control & CONTROL_RING)? TIOCM_RI : 0) 1261 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1262 1263 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1264 1265 return result; 1266 } 1267 1268 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1269 { 1270 struct usb_serial_port *port = tty->driver_data; 1271 u16 state; 1272 1273 if (break_state == 0) 1274 state = BREAK_OFF; 1275 else 1276 state = BREAK_ON; 1277 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1278 state == BREAK_OFF ? "off" : "on"); 1279 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1280 } 1281 1282 #ifdef CONFIG_GPIOLIB 1283 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1284 { 1285 struct usb_serial *serial = gpiochip_get_data(gc); 1286 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1287 1288 if (priv->gpio_altfunc & BIT(offset)) 1289 return -ENODEV; 1290 1291 return 0; 1292 } 1293 1294 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1295 { 1296 struct usb_serial *serial = gpiochip_get_data(gc); 1297 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1298 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1299 int result; 1300 u8 buf; 1301 1302 if (priv->partnum == CP210X_PARTNUM_CP2105) 1303 req_type = REQTYPE_INTERFACE_TO_HOST; 1304 1305 result = usb_autopm_get_interface(serial->interface); 1306 if (result) 1307 return result; 1308 1309 result = cp210x_read_vendor_block(serial, req_type, 1310 CP210X_READ_LATCH, &buf, sizeof(buf)); 1311 usb_autopm_put_interface(serial->interface); 1312 if (result < 0) 1313 return result; 1314 1315 return !!(buf & BIT(gpio)); 1316 } 1317 1318 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1319 { 1320 struct usb_serial *serial = gpiochip_get_data(gc); 1321 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1322 struct cp210x_gpio_write buf; 1323 int result; 1324 1325 if (value == 1) 1326 buf.state = BIT(gpio); 1327 else 1328 buf.state = 0; 1329 1330 buf.mask = BIT(gpio); 1331 1332 result = usb_autopm_get_interface(serial->interface); 1333 if (result) 1334 goto out; 1335 1336 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1337 result = cp210x_write_vendor_block(serial, 1338 REQTYPE_HOST_TO_INTERFACE, 1339 CP210X_WRITE_LATCH, &buf, 1340 sizeof(buf)); 1341 } else { 1342 u16 wIndex = buf.state << 8 | buf.mask; 1343 1344 result = usb_control_msg(serial->dev, 1345 usb_sndctrlpipe(serial->dev, 0), 1346 CP210X_VENDOR_SPECIFIC, 1347 REQTYPE_HOST_TO_DEVICE, 1348 CP210X_WRITE_LATCH, 1349 wIndex, 1350 NULL, 0, USB_CTRL_SET_TIMEOUT); 1351 } 1352 1353 usb_autopm_put_interface(serial->interface); 1354 out: 1355 if (result < 0) { 1356 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1357 result); 1358 } 1359 } 1360 1361 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1362 { 1363 struct usb_serial *serial = gpiochip_get_data(gc); 1364 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1365 1366 return priv->gpio_input & BIT(gpio); 1367 } 1368 1369 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1370 { 1371 struct usb_serial *serial = gpiochip_get_data(gc); 1372 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1373 1374 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1375 /* hardware does not support an input mode */ 1376 return -ENOTSUPP; 1377 } 1378 1379 /* push-pull pins cannot be changed to be inputs */ 1380 if (priv->gpio_pushpull & BIT(gpio)) 1381 return -EINVAL; 1382 1383 /* make sure to release pin if it is being driven low */ 1384 cp210x_gpio_set(gc, gpio, 1); 1385 1386 priv->gpio_input |= BIT(gpio); 1387 1388 return 0; 1389 } 1390 1391 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1392 int value) 1393 { 1394 struct usb_serial *serial = gpiochip_get_data(gc); 1395 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1396 1397 priv->gpio_input &= ~BIT(gpio); 1398 cp210x_gpio_set(gc, gpio, value); 1399 1400 return 0; 1401 } 1402 1403 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1404 unsigned long config) 1405 { 1406 struct usb_serial *serial = gpiochip_get_data(gc); 1407 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1408 enum pin_config_param param = pinconf_to_config_param(config); 1409 1410 /* Succeed only if in correct mode (this can't be set at runtime) */ 1411 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1412 (priv->gpio_pushpull & BIT(gpio))) 1413 return 0; 1414 1415 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1416 !(priv->gpio_pushpull & BIT(gpio))) 1417 return 0; 1418 1419 return -ENOTSUPP; 1420 } 1421 1422 /* 1423 * This function is for configuring GPIO using shared pins, where other signals 1424 * are made unavailable by configuring the use of GPIO. This is believed to be 1425 * only applicable to the cp2105 at this point, the other devices supported by 1426 * this driver that provide GPIO do so in a way that does not impact other 1427 * signals and are thus expected to have very different initialisation. 1428 */ 1429 static int cp2105_gpioconf_init(struct usb_serial *serial) 1430 { 1431 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1432 struct cp210x_pin_mode mode; 1433 struct cp210x_dual_port_config config; 1434 u8 intf_num = cp210x_interface_num(serial); 1435 u8 iface_config; 1436 int result; 1437 1438 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1439 CP210X_GET_DEVICEMODE, &mode, 1440 sizeof(mode)); 1441 if (result < 0) 1442 return result; 1443 1444 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1445 CP210X_GET_PORTCONFIG, &config, 1446 sizeof(config)); 1447 if (result < 0) 1448 return result; 1449 1450 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1451 if (intf_num == 0) { 1452 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1453 /* mark all GPIOs of this interface as reserved */ 1454 priv->gpio_altfunc = 0xff; 1455 return 0; 1456 } 1457 1458 iface_config = config.eci_cfg; 1459 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1460 CP210X_ECI_GPIO_MODE_MASK) >> 1461 CP210X_ECI_GPIO_MODE_OFFSET); 1462 priv->gc.ngpio = 2; 1463 } else if (intf_num == 1) { 1464 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1465 /* mark all GPIOs of this interface as reserved */ 1466 priv->gpio_altfunc = 0xff; 1467 return 0; 1468 } 1469 1470 iface_config = config.sci_cfg; 1471 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1472 CP210X_SCI_GPIO_MODE_MASK) >> 1473 CP210X_SCI_GPIO_MODE_OFFSET); 1474 priv->gc.ngpio = 3; 1475 } else { 1476 return -ENODEV; 1477 } 1478 1479 /* mark all pins which are not in GPIO mode */ 1480 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1481 priv->gpio_altfunc |= BIT(0); 1482 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1483 CP2105_GPIO1_RS485_MODE)) 1484 priv->gpio_altfunc |= BIT(1); 1485 1486 /* driver implementation for CP2105 only supports outputs */ 1487 priv->gpio_input = 0; 1488 1489 return 0; 1490 } 1491 1492 static int cp2104_gpioconf_init(struct usb_serial *serial) 1493 { 1494 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1495 struct cp210x_single_port_config config; 1496 u8 iface_config; 1497 u8 gpio_latch; 1498 int result; 1499 u8 i; 1500 1501 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1502 CP210X_GET_PORTCONFIG, &config, 1503 sizeof(config)); 1504 if (result < 0) 1505 return result; 1506 1507 priv->gc.ngpio = 4; 1508 1509 iface_config = config.device_cfg; 1510 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1511 CP210X_GPIO_MODE_MASK) >> 1512 CP210X_GPIO_MODE_OFFSET); 1513 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1514 CP210X_GPIO_MODE_MASK) >> 1515 CP210X_GPIO_MODE_OFFSET); 1516 1517 /* mark all pins which are not in GPIO mode */ 1518 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1519 priv->gpio_altfunc |= BIT(0); 1520 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1521 priv->gpio_altfunc |= BIT(1); 1522 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1523 priv->gpio_altfunc |= BIT(2); 1524 1525 /* 1526 * Like CP2102N, CP2104 has also no strict input and output pin 1527 * modes. 1528 * Do the same input mode emulation as CP2102N. 1529 */ 1530 for (i = 0; i < priv->gc.ngpio; ++i) { 1531 /* 1532 * Set direction to "input" iff pin is open-drain and reset 1533 * value is 1. 1534 */ 1535 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1536 priv->gpio_input |= BIT(i); 1537 } 1538 1539 return 0; 1540 } 1541 1542 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1543 { 1544 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1545 const u16 config_size = 0x02a6; 1546 u8 gpio_rst_latch; 1547 u8 config_version; 1548 u8 gpio_pushpull; 1549 u8 *config_buf; 1550 u8 gpio_latch; 1551 u8 gpio_ctrl; 1552 int result; 1553 u8 i; 1554 1555 /* 1556 * Retrieve device configuration from the device. 1557 * The array received contains all customization settings done at the 1558 * factory/manufacturer. Format of the array is documented at the 1559 * time of writing at: 1560 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1561 */ 1562 config_buf = kmalloc(config_size, GFP_KERNEL); 1563 if (!config_buf) 1564 return -ENOMEM; 1565 1566 result = cp210x_read_vendor_block(serial, 1567 REQTYPE_DEVICE_TO_HOST, 1568 CP210X_READ_2NCONFIG, 1569 config_buf, 1570 config_size); 1571 if (result < 0) { 1572 kfree(config_buf); 1573 return result; 1574 } 1575 1576 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1577 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1578 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1579 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1580 1581 kfree(config_buf); 1582 1583 /* Make sure this is a config format we understand. */ 1584 if (config_version != 0x01) 1585 return -ENOTSUPP; 1586 1587 priv->gc.ngpio = 4; 1588 1589 /* 1590 * Get default pin states after reset. Needed so we can determine 1591 * the direction of an open-drain pin. 1592 */ 1593 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1594 1595 /* 0 indicates open-drain mode, 1 is push-pull */ 1596 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1597 1598 /* 0 indicates GPIO mode, 1 is alternate function */ 1599 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1600 1601 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1602 /* 1603 * For the QFN28 package, GPIO4-6 are controlled by 1604 * the low three bits of the mode/latch fields. 1605 * Contrary to the document linked above, the bits for 1606 * the SUSPEND pins are elsewhere. No alternate 1607 * function is available for these pins. 1608 */ 1609 priv->gc.ngpio = 7; 1610 gpio_latch |= (gpio_rst_latch & 7) << 4; 1611 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1612 } 1613 1614 /* 1615 * The CP2102N does not strictly has input and output pin modes, 1616 * it only knows open-drain and push-pull modes which is set at 1617 * factory. An open-drain pin can function both as an 1618 * input or an output. We emulate input mode for open-drain pins 1619 * by making sure they are not driven low, and we do not allow 1620 * push-pull pins to be set as an input. 1621 */ 1622 for (i = 0; i < priv->gc.ngpio; ++i) { 1623 /* 1624 * Set direction to "input" iff pin is open-drain and reset 1625 * value is 1. 1626 */ 1627 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1628 priv->gpio_input |= BIT(i); 1629 } 1630 1631 return 0; 1632 } 1633 1634 static int cp210x_gpio_init(struct usb_serial *serial) 1635 { 1636 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1637 int result; 1638 1639 switch (priv->partnum) { 1640 case CP210X_PARTNUM_CP2104: 1641 result = cp2104_gpioconf_init(serial); 1642 break; 1643 case CP210X_PARTNUM_CP2105: 1644 result = cp2105_gpioconf_init(serial); 1645 break; 1646 case CP210X_PARTNUM_CP2102N_QFN28: 1647 case CP210X_PARTNUM_CP2102N_QFN24: 1648 case CP210X_PARTNUM_CP2102N_QFN20: 1649 result = cp2102n_gpioconf_init(serial); 1650 break; 1651 default: 1652 return 0; 1653 } 1654 1655 if (result < 0) 1656 return result; 1657 1658 priv->gc.label = "cp210x"; 1659 priv->gc.request = cp210x_gpio_request; 1660 priv->gc.get_direction = cp210x_gpio_direction_get; 1661 priv->gc.direction_input = cp210x_gpio_direction_input; 1662 priv->gc.direction_output = cp210x_gpio_direction_output; 1663 priv->gc.get = cp210x_gpio_get; 1664 priv->gc.set = cp210x_gpio_set; 1665 priv->gc.set_config = cp210x_gpio_set_config; 1666 priv->gc.owner = THIS_MODULE; 1667 priv->gc.parent = &serial->interface->dev; 1668 priv->gc.base = -1; 1669 priv->gc.can_sleep = true; 1670 1671 result = gpiochip_add_data(&priv->gc, serial); 1672 if (!result) 1673 priv->gpio_registered = true; 1674 1675 return result; 1676 } 1677 1678 static void cp210x_gpio_remove(struct usb_serial *serial) 1679 { 1680 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1681 1682 if (priv->gpio_registered) { 1683 gpiochip_remove(&priv->gc); 1684 priv->gpio_registered = false; 1685 } 1686 } 1687 1688 #else 1689 1690 static int cp210x_gpio_init(struct usb_serial *serial) 1691 { 1692 return 0; 1693 } 1694 1695 static void cp210x_gpio_remove(struct usb_serial *serial) 1696 { 1697 /* Nothing to do */ 1698 } 1699 1700 #endif 1701 1702 static int cp210x_port_probe(struct usb_serial_port *port) 1703 { 1704 struct usb_serial *serial = port->serial; 1705 struct cp210x_port_private *port_priv; 1706 1707 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1708 if (!port_priv) 1709 return -ENOMEM; 1710 1711 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1712 1713 usb_set_serial_port_data(port, port_priv); 1714 1715 return 0; 1716 } 1717 1718 static int cp210x_port_remove(struct usb_serial_port *port) 1719 { 1720 struct cp210x_port_private *port_priv; 1721 1722 port_priv = usb_get_serial_port_data(port); 1723 kfree(port_priv); 1724 1725 return 0; 1726 } 1727 1728 static void cp210x_init_max_speed(struct usb_serial *serial) 1729 { 1730 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1731 bool use_actual_rate = false; 1732 speed_t min = 300; 1733 speed_t max; 1734 1735 switch (priv->partnum) { 1736 case CP210X_PARTNUM_CP2101: 1737 max = 921600; 1738 break; 1739 case CP210X_PARTNUM_CP2102: 1740 case CP210X_PARTNUM_CP2103: 1741 max = 1000000; 1742 break; 1743 case CP210X_PARTNUM_CP2104: 1744 use_actual_rate = true; 1745 max = 2000000; 1746 break; 1747 case CP210X_PARTNUM_CP2108: 1748 max = 2000000; 1749 break; 1750 case CP210X_PARTNUM_CP2105: 1751 if (cp210x_interface_num(serial) == 0) { 1752 use_actual_rate = true; 1753 max = 2000000; /* ECI */ 1754 } else { 1755 min = 2400; 1756 max = 921600; /* SCI */ 1757 } 1758 break; 1759 case CP210X_PARTNUM_CP2102N_QFN28: 1760 case CP210X_PARTNUM_CP2102N_QFN24: 1761 case CP210X_PARTNUM_CP2102N_QFN20: 1762 use_actual_rate = true; 1763 max = 3000000; 1764 break; 1765 default: 1766 max = 2000000; 1767 break; 1768 } 1769 1770 priv->min_speed = min; 1771 priv->max_speed = max; 1772 priv->use_actual_rate = use_actual_rate; 1773 } 1774 1775 static int cp210x_attach(struct usb_serial *serial) 1776 { 1777 int result; 1778 struct cp210x_serial_private *priv; 1779 1780 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1781 if (!priv) 1782 return -ENOMEM; 1783 1784 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1785 CP210X_GET_PARTNUM, &priv->partnum, 1786 sizeof(priv->partnum)); 1787 if (result < 0) { 1788 dev_warn(&serial->interface->dev, 1789 "querying part number failed\n"); 1790 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1791 } 1792 1793 usb_set_serial_data(serial, priv); 1794 1795 cp210x_init_max_speed(serial); 1796 1797 result = cp210x_gpio_init(serial); 1798 if (result < 0) { 1799 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1800 result); 1801 } 1802 1803 return 0; 1804 } 1805 1806 static void cp210x_disconnect(struct usb_serial *serial) 1807 { 1808 cp210x_gpio_remove(serial); 1809 } 1810 1811 static void cp210x_release(struct usb_serial *serial) 1812 { 1813 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1814 1815 cp210x_gpio_remove(serial); 1816 1817 kfree(priv); 1818 } 1819 1820 module_usb_serial_driver(serial_drivers, id_table); 1821 1822 MODULE_DESCRIPTION(DRIVER_DESC); 1823 MODULE_LICENSE("GPL v2"); 1824