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_get_termios(struct tty_struct *, struct usb_serial_port *); 35 static void cp210x_get_termios_port(struct usb_serial_port *port, 36 tcflag_t *cflagp, unsigned int *baudp); 37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 38 struct ktermios *); 39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 40 struct ktermios*); 41 static bool cp210x_tx_empty(struct usb_serial_port *port); 42 static int cp210x_tiocmget(struct tty_struct *); 43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 44 static int cp210x_tiocmset_port(struct usb_serial_port *port, 45 unsigned int, unsigned int); 46 static void cp210x_break_ctl(struct tty_struct *, int); 47 static int cp210x_attach(struct usb_serial *); 48 static void cp210x_disconnect(struct usb_serial *); 49 static void cp210x_release(struct usb_serial *); 50 static int cp210x_port_probe(struct usb_serial_port *); 51 static int cp210x_port_remove(struct usb_serial_port *); 52 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 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(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 65 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 66 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 67 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 68 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 69 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 70 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 71 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 72 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 73 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 74 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 75 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 76 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 77 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 78 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 79 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 80 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 81 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 82 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 83 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 84 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 85 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 86 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 87 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 88 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 89 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 90 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 91 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 92 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 93 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 94 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 95 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 96 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 97 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 98 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 99 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 100 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 102 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 103 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 104 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 105 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 106 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 107 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 108 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 109 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 110 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 111 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 112 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 113 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 114 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 115 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 116 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 117 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 118 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 119 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 120 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 121 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 122 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 123 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 124 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 125 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 126 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 127 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 128 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 129 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 130 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 131 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 132 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 133 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 134 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 135 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 136 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 137 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 138 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 139 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 140 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 141 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 142 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 143 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 144 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 145 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 146 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 147 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 148 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 149 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 150 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 151 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 152 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 153 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 154 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 155 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 156 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 157 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 158 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 159 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 160 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 161 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 162 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 163 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 164 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 165 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 166 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 167 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 168 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 169 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 170 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 171 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 172 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 173 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 174 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 175 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 176 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 177 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 178 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 179 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 180 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 181 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 182 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 183 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 184 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 185 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 186 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 187 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 188 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 189 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 190 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 191 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 192 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 193 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 194 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 195 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 196 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 197 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 198 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 199 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 200 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 201 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 202 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 203 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 204 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 205 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 206 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 207 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 208 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 209 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 210 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 211 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 212 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 213 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 214 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 215 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 216 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 217 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 218 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 219 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 220 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 221 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 224 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 225 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 226 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 227 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 228 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 229 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 230 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 231 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 232 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 233 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 234 { } /* Terminating Entry */ 235 }; 236 237 MODULE_DEVICE_TABLE(usb, id_table); 238 239 struct cp210x_serial_private { 240 #ifdef CONFIG_GPIOLIB 241 struct gpio_chip gc; 242 bool gpio_registered; 243 u8 gpio_pushpull; 244 u8 gpio_altfunc; 245 u8 gpio_input; 246 #endif 247 u8 partnum; 248 speed_t max_speed; 249 bool use_actual_rate; 250 }; 251 252 struct cp210x_port_private { 253 __u8 bInterfaceNumber; 254 bool has_swapped_line_ctl; 255 }; 256 257 static struct usb_serial_driver cp210x_device = { 258 .driver = { 259 .owner = THIS_MODULE, 260 .name = "cp210x", 261 }, 262 .id_table = id_table, 263 .num_ports = 1, 264 .bulk_in_size = 256, 265 .bulk_out_size = 256, 266 .open = cp210x_open, 267 .close = cp210x_close, 268 .break_ctl = cp210x_break_ctl, 269 .set_termios = cp210x_set_termios, 270 .tx_empty = cp210x_tx_empty, 271 .tiocmget = cp210x_tiocmget, 272 .tiocmset = cp210x_tiocmset, 273 .attach = cp210x_attach, 274 .disconnect = cp210x_disconnect, 275 .release = cp210x_release, 276 .port_probe = cp210x_port_probe, 277 .port_remove = cp210x_port_remove, 278 .dtr_rts = cp210x_dtr_rts 279 }; 280 281 static struct usb_serial_driver * const serial_drivers[] = { 282 &cp210x_device, NULL 283 }; 284 285 /* Config request types */ 286 #define REQTYPE_HOST_TO_INTERFACE 0x41 287 #define REQTYPE_INTERFACE_TO_HOST 0xc1 288 #define REQTYPE_HOST_TO_DEVICE 0x40 289 #define REQTYPE_DEVICE_TO_HOST 0xc0 290 291 /* Config request codes */ 292 #define CP210X_IFC_ENABLE 0x00 293 #define CP210X_SET_BAUDDIV 0x01 294 #define CP210X_GET_BAUDDIV 0x02 295 #define CP210X_SET_LINE_CTL 0x03 296 #define CP210X_GET_LINE_CTL 0x04 297 #define CP210X_SET_BREAK 0x05 298 #define CP210X_IMM_CHAR 0x06 299 #define CP210X_SET_MHS 0x07 300 #define CP210X_GET_MDMSTS 0x08 301 #define CP210X_SET_XON 0x09 302 #define CP210X_SET_XOFF 0x0A 303 #define CP210X_SET_EVENTMASK 0x0B 304 #define CP210X_GET_EVENTMASK 0x0C 305 #define CP210X_SET_CHAR 0x0D 306 #define CP210X_GET_CHARS 0x0E 307 #define CP210X_GET_PROPS 0x0F 308 #define CP210X_GET_COMM_STATUS 0x10 309 #define CP210X_RESET 0x11 310 #define CP210X_PURGE 0x12 311 #define CP210X_SET_FLOW 0x13 312 #define CP210X_GET_FLOW 0x14 313 #define CP210X_EMBED_EVENTS 0x15 314 #define CP210X_GET_EVENTSTATE 0x16 315 #define CP210X_SET_CHARS 0x19 316 #define CP210X_GET_BAUDRATE 0x1D 317 #define CP210X_SET_BAUDRATE 0x1E 318 #define CP210X_VENDOR_SPECIFIC 0xFF 319 320 /* CP210X_IFC_ENABLE */ 321 #define UART_ENABLE 0x0001 322 #define UART_DISABLE 0x0000 323 324 /* CP210X_(SET|GET)_BAUDDIV */ 325 #define BAUD_RATE_GEN_FREQ 0x384000 326 327 /* CP210X_(SET|GET)_LINE_CTL */ 328 #define BITS_DATA_MASK 0X0f00 329 #define BITS_DATA_5 0X0500 330 #define BITS_DATA_6 0X0600 331 #define BITS_DATA_7 0X0700 332 #define BITS_DATA_8 0X0800 333 #define BITS_DATA_9 0X0900 334 335 #define BITS_PARITY_MASK 0x00f0 336 #define BITS_PARITY_NONE 0x0000 337 #define BITS_PARITY_ODD 0x0010 338 #define BITS_PARITY_EVEN 0x0020 339 #define BITS_PARITY_MARK 0x0030 340 #define BITS_PARITY_SPACE 0x0040 341 342 #define BITS_STOP_MASK 0x000f 343 #define BITS_STOP_1 0x0000 344 #define BITS_STOP_1_5 0x0001 345 #define BITS_STOP_2 0x0002 346 347 /* CP210X_SET_BREAK */ 348 #define BREAK_ON 0x0001 349 #define BREAK_OFF 0x0000 350 351 /* CP210X_(SET_MHS|GET_MDMSTS) */ 352 #define CONTROL_DTR 0x0001 353 #define CONTROL_RTS 0x0002 354 #define CONTROL_CTS 0x0010 355 #define CONTROL_DSR 0x0020 356 #define CONTROL_RING 0x0040 357 #define CONTROL_DCD 0x0080 358 #define CONTROL_WRITE_DTR 0x0100 359 #define CONTROL_WRITE_RTS 0x0200 360 361 /* CP210X_VENDOR_SPECIFIC values */ 362 #define CP210X_READ_2NCONFIG 0x000E 363 #define CP210X_READ_LATCH 0x00C2 364 #define CP210X_GET_PARTNUM 0x370B 365 #define CP210X_GET_PORTCONFIG 0x370C 366 #define CP210X_GET_DEVICEMODE 0x3711 367 #define CP210X_WRITE_LATCH 0x37E1 368 369 /* Part number definitions */ 370 #define CP210X_PARTNUM_CP2101 0x01 371 #define CP210X_PARTNUM_CP2102 0x02 372 #define CP210X_PARTNUM_CP2103 0x03 373 #define CP210X_PARTNUM_CP2104 0x04 374 #define CP210X_PARTNUM_CP2105 0x05 375 #define CP210X_PARTNUM_CP2108 0x08 376 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 377 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 378 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 379 #define CP210X_PARTNUM_UNKNOWN 0xFF 380 381 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 382 struct cp210x_comm_status { 383 __le32 ulErrors; 384 __le32 ulHoldReasons; 385 __le32 ulAmountInInQueue; 386 __le32 ulAmountInOutQueue; 387 u8 bEofReceived; 388 u8 bWaitForImmediate; 389 u8 bReserved; 390 } __packed; 391 392 /* 393 * CP210X_PURGE - 16 bits passed in wValue of USB request. 394 * SiLabs app note AN571 gives a strange description of the 4 bits: 395 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 396 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 397 */ 398 #define PURGE_ALL 0x000f 399 400 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 401 struct cp210x_flow_ctl { 402 __le32 ulControlHandshake; 403 __le32 ulFlowReplace; 404 __le32 ulXonLimit; 405 __le32 ulXoffLimit; 406 } __packed; 407 408 /* cp210x_flow_ctl::ulControlHandshake */ 409 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 410 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 411 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 412 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 413 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 414 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 415 416 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 417 #define CP210X_SERIAL_DTR_INACTIVE 0 418 #define CP210X_SERIAL_DTR_ACTIVE 1 419 #define CP210X_SERIAL_DTR_FLOW_CTL 2 420 421 /* cp210x_flow_ctl::ulFlowReplace */ 422 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 423 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 424 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 425 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 426 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 427 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 428 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 429 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 430 431 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 432 #define CP210X_SERIAL_RTS_INACTIVE 0 433 #define CP210X_SERIAL_RTS_ACTIVE 1 434 #define CP210X_SERIAL_RTS_FLOW_CTL 2 435 436 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 437 struct cp210x_pin_mode { 438 u8 eci; 439 u8 sci; 440 } __packed; 441 442 #define CP210X_PIN_MODE_MODEM 0 443 #define CP210X_PIN_MODE_GPIO BIT(0) 444 445 /* 446 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes. 447 * Structure needs padding due to unused/unspecified bytes. 448 */ 449 struct cp210x_config { 450 __le16 gpio_mode; 451 u8 __pad0[2]; 452 __le16 reset_state; 453 u8 __pad1[4]; 454 __le16 suspend_state; 455 u8 sci_cfg; 456 u8 eci_cfg; 457 u8 device_cfg; 458 } __packed; 459 460 /* GPIO modes */ 461 #define CP210X_SCI_GPIO_MODE_OFFSET 9 462 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 463 464 #define CP210X_ECI_GPIO_MODE_OFFSET 2 465 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 466 467 /* CP2105 port configuration values */ 468 #define CP2105_GPIO0_TXLED_MODE BIT(0) 469 #define CP2105_GPIO1_RXLED_MODE BIT(1) 470 #define CP2105_GPIO1_RS485_MODE BIT(2) 471 472 /* CP2102N configuration array indices */ 473 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 474 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 475 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 476 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 477 478 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 479 struct cp210x_gpio_write { 480 u8 mask; 481 u8 state; 482 } __packed; 483 484 /* 485 * Helper to get interface number when we only have struct usb_serial. 486 */ 487 static u8 cp210x_interface_num(struct usb_serial *serial) 488 { 489 struct usb_host_interface *cur_altsetting; 490 491 cur_altsetting = serial->interface->cur_altsetting; 492 493 return cur_altsetting->desc.bInterfaceNumber; 494 } 495 496 /* 497 * Reads a variable-sized block of CP210X_ registers, identified by req. 498 * Returns data into buf in native USB byte order. 499 */ 500 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 501 void *buf, int bufsize) 502 { 503 struct usb_serial *serial = port->serial; 504 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 505 void *dmabuf; 506 int result; 507 508 dmabuf = kmalloc(bufsize, GFP_KERNEL); 509 if (!dmabuf) { 510 /* 511 * FIXME Some callers don't bother to check for error, 512 * at least give them consistent junk until they are fixed 513 */ 514 memset(buf, 0, bufsize); 515 return -ENOMEM; 516 } 517 518 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 519 req, REQTYPE_INTERFACE_TO_HOST, 0, 520 port_priv->bInterfaceNumber, dmabuf, bufsize, 521 USB_CTRL_SET_TIMEOUT); 522 if (result == bufsize) { 523 memcpy(buf, dmabuf, bufsize); 524 result = 0; 525 } else { 526 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 527 req, bufsize, result); 528 if (result >= 0) 529 result = -EIO; 530 531 /* 532 * FIXME Some callers don't bother to check for error, 533 * at least give them consistent junk until they are fixed 534 */ 535 memset(buf, 0, bufsize); 536 } 537 538 kfree(dmabuf); 539 540 return result; 541 } 542 543 /* 544 * Reads any 32-bit CP210X_ register identified by req. 545 */ 546 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 547 { 548 __le32 le32_val; 549 int err; 550 551 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 552 if (err) { 553 /* 554 * FIXME Some callers don't bother to check for error, 555 * at least give them consistent junk until they are fixed 556 */ 557 *val = 0; 558 return err; 559 } 560 561 *val = le32_to_cpu(le32_val); 562 563 return 0; 564 } 565 566 /* 567 * Reads any 16-bit CP210X_ register identified by req. 568 */ 569 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 570 { 571 __le16 le16_val; 572 int err; 573 574 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 575 if (err) 576 return err; 577 578 *val = le16_to_cpu(le16_val); 579 580 return 0; 581 } 582 583 /* 584 * Reads any 8-bit CP210X_ register identified by req. 585 */ 586 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 587 { 588 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 589 } 590 591 /* 592 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 593 * Returns data into buf in native USB byte order. 594 */ 595 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 596 void *buf, int bufsize) 597 { 598 void *dmabuf; 599 int result; 600 601 dmabuf = kmalloc(bufsize, GFP_KERNEL); 602 if (!dmabuf) 603 return -ENOMEM; 604 605 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 606 CP210X_VENDOR_SPECIFIC, type, val, 607 cp210x_interface_num(serial), dmabuf, bufsize, 608 USB_CTRL_GET_TIMEOUT); 609 if (result == bufsize) { 610 memcpy(buf, dmabuf, bufsize); 611 result = 0; 612 } else { 613 dev_err(&serial->interface->dev, 614 "failed to get vendor val 0x%04x size %d: %d\n", val, 615 bufsize, result); 616 if (result >= 0) 617 result = -EIO; 618 } 619 620 kfree(dmabuf); 621 622 return result; 623 } 624 625 /* 626 * Writes any 16-bit CP210X_ register (req) whose value is passed 627 * entirely in the wValue field of the USB request. 628 */ 629 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 630 { 631 struct usb_serial *serial = port->serial; 632 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 633 int result; 634 635 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 636 req, REQTYPE_HOST_TO_INTERFACE, val, 637 port_priv->bInterfaceNumber, NULL, 0, 638 USB_CTRL_SET_TIMEOUT); 639 if (result < 0) { 640 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 641 req, result); 642 } 643 644 return result; 645 } 646 647 /* 648 * Writes a variable-sized block of CP210X_ registers, identified by req. 649 * Data in buf must be in native USB byte order. 650 */ 651 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 652 void *buf, int bufsize) 653 { 654 struct usb_serial *serial = port->serial; 655 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 656 void *dmabuf; 657 int result; 658 659 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 660 if (!dmabuf) 661 return -ENOMEM; 662 663 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 664 req, REQTYPE_HOST_TO_INTERFACE, 0, 665 port_priv->bInterfaceNumber, dmabuf, bufsize, 666 USB_CTRL_SET_TIMEOUT); 667 668 kfree(dmabuf); 669 670 if (result == bufsize) { 671 result = 0; 672 } else { 673 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 674 req, bufsize, result); 675 if (result >= 0) 676 result = -EIO; 677 } 678 679 return result; 680 } 681 682 /* 683 * Writes any 32-bit CP210X_ register identified by req. 684 */ 685 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 686 { 687 __le32 le32_val; 688 689 le32_val = cpu_to_le32(val); 690 691 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 692 } 693 694 #ifdef CONFIG_GPIOLIB 695 /* 696 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 697 * Data in buf must be in native USB byte order. 698 */ 699 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 700 u16 val, void *buf, int bufsize) 701 { 702 void *dmabuf; 703 int result; 704 705 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 706 if (!dmabuf) 707 return -ENOMEM; 708 709 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 710 CP210X_VENDOR_SPECIFIC, type, val, 711 cp210x_interface_num(serial), dmabuf, bufsize, 712 USB_CTRL_SET_TIMEOUT); 713 714 kfree(dmabuf); 715 716 if (result == bufsize) { 717 result = 0; 718 } else { 719 dev_err(&serial->interface->dev, 720 "failed to set vendor val 0x%04x size %d: %d\n", val, 721 bufsize, result); 722 if (result >= 0) 723 result = -EIO; 724 } 725 726 return result; 727 } 728 #endif 729 730 /* 731 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 732 * Write a known good value 0x800, read it back. 733 * If it comes back swapped the bug is detected. 734 * Preserve the original register value. 735 */ 736 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 737 { 738 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 739 u16 line_ctl_save; 740 u16 line_ctl_test; 741 int err; 742 743 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 744 if (err) 745 return err; 746 747 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 748 if (err) 749 return err; 750 751 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 752 if (err) 753 return err; 754 755 if (line_ctl_test == 8) { 756 port_priv->has_swapped_line_ctl = true; 757 line_ctl_save = swab16(line_ctl_save); 758 } 759 760 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 761 } 762 763 /* 764 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 765 * to workaround cp2108 bug and get correct value. 766 */ 767 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 768 { 769 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 770 int err; 771 772 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 773 if (err) 774 return err; 775 776 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 777 if (port_priv->has_swapped_line_ctl) 778 *ctl = swab16(*ctl); 779 780 return 0; 781 } 782 783 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 784 { 785 int result; 786 787 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 788 if (result) { 789 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 790 return result; 791 } 792 793 /* Configure the termios structure */ 794 cp210x_get_termios(tty, port); 795 796 /* The baud rate must be initialised on cp2104 */ 797 if (tty) 798 cp210x_change_speed(tty, port, NULL); 799 800 return usb_serial_generic_open(tty, port); 801 } 802 803 static void cp210x_close(struct usb_serial_port *port) 804 { 805 usb_serial_generic_close(port); 806 807 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 808 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 809 810 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 811 } 812 813 /* 814 * Read how many bytes are waiting in the TX queue. 815 */ 816 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 817 u32 *count) 818 { 819 struct usb_serial *serial = port->serial; 820 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 821 struct cp210x_comm_status *sts; 822 int result; 823 824 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 825 if (!sts) 826 return -ENOMEM; 827 828 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 829 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 830 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 831 USB_CTRL_GET_TIMEOUT); 832 if (result == sizeof(*sts)) { 833 *count = le32_to_cpu(sts->ulAmountInOutQueue); 834 result = 0; 835 } else { 836 dev_err(&port->dev, "failed to get comm status: %d\n", result); 837 if (result >= 0) 838 result = -EIO; 839 } 840 841 kfree(sts); 842 843 return result; 844 } 845 846 static bool cp210x_tx_empty(struct usb_serial_port *port) 847 { 848 int err; 849 u32 count; 850 851 err = cp210x_get_tx_queue_byte_count(port, &count); 852 if (err) 853 return true; 854 855 return !count; 856 } 857 858 /* 859 * cp210x_get_termios 860 * Reads the baud rate, data bits, parity, stop bits and flow control mode 861 * from the device, corrects any unsupported values, and configures the 862 * termios structure to reflect the state of the device 863 */ 864 static void cp210x_get_termios(struct tty_struct *tty, 865 struct usb_serial_port *port) 866 { 867 unsigned int baud; 868 869 if (tty) { 870 cp210x_get_termios_port(tty->driver_data, 871 &tty->termios.c_cflag, &baud); 872 tty_encode_baud_rate(tty, baud, baud); 873 } else { 874 tcflag_t cflag; 875 cflag = 0; 876 cp210x_get_termios_port(port, &cflag, &baud); 877 } 878 } 879 880 /* 881 * cp210x_get_termios_port 882 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 883 */ 884 static void cp210x_get_termios_port(struct usb_serial_port *port, 885 tcflag_t *cflagp, unsigned int *baudp) 886 { 887 struct device *dev = &port->dev; 888 tcflag_t cflag; 889 struct cp210x_flow_ctl flow_ctl; 890 u32 baud; 891 u16 bits; 892 u32 ctl_hs; 893 894 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 895 896 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 897 *baudp = baud; 898 899 cflag = *cflagp; 900 901 cp210x_get_line_ctl(port, &bits); 902 cflag &= ~CSIZE; 903 switch (bits & BITS_DATA_MASK) { 904 case BITS_DATA_5: 905 dev_dbg(dev, "%s - data bits = 5\n", __func__); 906 cflag |= CS5; 907 break; 908 case BITS_DATA_6: 909 dev_dbg(dev, "%s - data bits = 6\n", __func__); 910 cflag |= CS6; 911 break; 912 case BITS_DATA_7: 913 dev_dbg(dev, "%s - data bits = 7\n", __func__); 914 cflag |= CS7; 915 break; 916 case BITS_DATA_8: 917 dev_dbg(dev, "%s - data bits = 8\n", __func__); 918 cflag |= CS8; 919 break; 920 case BITS_DATA_9: 921 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 922 cflag |= CS8; 923 bits &= ~BITS_DATA_MASK; 924 bits |= BITS_DATA_8; 925 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 926 break; 927 default: 928 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 929 cflag |= CS8; 930 bits &= ~BITS_DATA_MASK; 931 bits |= BITS_DATA_8; 932 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 933 break; 934 } 935 936 switch (bits & BITS_PARITY_MASK) { 937 case BITS_PARITY_NONE: 938 dev_dbg(dev, "%s - parity = NONE\n", __func__); 939 cflag &= ~PARENB; 940 break; 941 case BITS_PARITY_ODD: 942 dev_dbg(dev, "%s - parity = ODD\n", __func__); 943 cflag |= (PARENB|PARODD); 944 break; 945 case BITS_PARITY_EVEN: 946 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 947 cflag &= ~PARODD; 948 cflag |= PARENB; 949 break; 950 case BITS_PARITY_MARK: 951 dev_dbg(dev, "%s - parity = MARK\n", __func__); 952 cflag |= (PARENB|PARODD|CMSPAR); 953 break; 954 case BITS_PARITY_SPACE: 955 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 956 cflag &= ~PARODD; 957 cflag |= (PARENB|CMSPAR); 958 break; 959 default: 960 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 961 cflag &= ~PARENB; 962 bits &= ~BITS_PARITY_MASK; 963 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 964 break; 965 } 966 967 cflag &= ~CSTOPB; 968 switch (bits & BITS_STOP_MASK) { 969 case BITS_STOP_1: 970 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 971 break; 972 case BITS_STOP_1_5: 973 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 974 bits &= ~BITS_STOP_MASK; 975 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 976 break; 977 case BITS_STOP_2: 978 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 979 cflag |= CSTOPB; 980 break; 981 default: 982 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 983 bits &= ~BITS_STOP_MASK; 984 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 985 break; 986 } 987 988 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 989 sizeof(flow_ctl)); 990 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 991 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 992 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 993 cflag |= CRTSCTS; 994 } else { 995 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 996 cflag &= ~CRTSCTS; 997 } 998 999 *cflagp = cflag; 1000 } 1001 1002 struct cp210x_rate { 1003 speed_t rate; 1004 speed_t high; 1005 }; 1006 1007 static const struct cp210x_rate cp210x_an205_table1[] = { 1008 { 300, 300 }, 1009 { 600, 600 }, 1010 { 1200, 1200 }, 1011 { 1800, 1800 }, 1012 { 2400, 2400 }, 1013 { 4000, 4000 }, 1014 { 4800, 4803 }, 1015 { 7200, 7207 }, 1016 { 9600, 9612 }, 1017 { 14400, 14428 }, 1018 { 16000, 16062 }, 1019 { 19200, 19250 }, 1020 { 28800, 28912 }, 1021 { 38400, 38601 }, 1022 { 51200, 51558 }, 1023 { 56000, 56280 }, 1024 { 57600, 58053 }, 1025 { 64000, 64111 }, 1026 { 76800, 77608 }, 1027 { 115200, 117028 }, 1028 { 128000, 129347 }, 1029 { 153600, 156868 }, 1030 { 230400, 237832 }, 1031 { 250000, 254234 }, 1032 { 256000, 273066 }, 1033 { 460800, 491520 }, 1034 { 500000, 567138 }, 1035 { 576000, 670254 }, 1036 { 921600, UINT_MAX } 1037 }; 1038 1039 /* 1040 * Quantises the baud rate as per AN205 Table 1 1041 */ 1042 static speed_t cp210x_get_an205_rate(speed_t baud) 1043 { 1044 int i; 1045 1046 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1047 if (baud <= cp210x_an205_table1[i].high) 1048 break; 1049 } 1050 1051 return cp210x_an205_table1[i].rate; 1052 } 1053 1054 static speed_t cp210x_get_actual_rate(struct usb_serial *serial, speed_t baud) 1055 { 1056 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1057 unsigned int prescale = 1; 1058 unsigned int div; 1059 1060 baud = clamp(baud, 300u, priv->max_speed); 1061 1062 if (baud <= 365) 1063 prescale = 4; 1064 1065 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1066 baud = 48000000 / (2 * prescale * div); 1067 1068 return baud; 1069 } 1070 1071 /* 1072 * CP2101 supports the following baud rates: 1073 * 1074 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1075 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1076 * 1077 * CP2102 and CP2103 support the following additional rates: 1078 * 1079 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1080 * 576000 1081 * 1082 * The device will map a requested rate to a supported one, but the result 1083 * of requests for rates greater than 1053257 is undefined (see AN205). 1084 * 1085 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1086 * respectively, with an error less than 1%. The actual rates are determined 1087 * by 1088 * 1089 * div = round(freq / (2 x prescale x request)) 1090 * actual = freq / (2 x prescale x div) 1091 * 1092 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1093 * or 1 otherwise. 1094 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1095 * otherwise. 1096 */ 1097 static void cp210x_change_speed(struct tty_struct *tty, 1098 struct usb_serial_port *port, struct ktermios *old_termios) 1099 { 1100 struct usb_serial *serial = port->serial; 1101 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1102 u32 baud; 1103 1104 baud = tty->termios.c_ospeed; 1105 1106 /* 1107 * This maps the requested rate to the actual rate, a valid rate on 1108 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1109 * 1110 * NOTE: B0 is not implemented. 1111 */ 1112 if (priv->use_actual_rate) 1113 baud = cp210x_get_actual_rate(serial, baud); 1114 else if (baud < 1000000) 1115 baud = cp210x_get_an205_rate(baud); 1116 else if (baud > priv->max_speed) 1117 baud = priv->max_speed; 1118 1119 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1120 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1121 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1122 if (old_termios) 1123 baud = old_termios->c_ospeed; 1124 else 1125 baud = 9600; 1126 } 1127 1128 tty_encode_baud_rate(tty, baud, baud); 1129 } 1130 1131 static void cp210x_set_termios(struct tty_struct *tty, 1132 struct usb_serial_port *port, struct ktermios *old_termios) 1133 { 1134 struct device *dev = &port->dev; 1135 unsigned int cflag, old_cflag; 1136 u16 bits; 1137 1138 cflag = tty->termios.c_cflag; 1139 old_cflag = old_termios->c_cflag; 1140 1141 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1142 cp210x_change_speed(tty, port, old_termios); 1143 1144 /* If the number of data bits is to be updated */ 1145 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1146 cp210x_get_line_ctl(port, &bits); 1147 bits &= ~BITS_DATA_MASK; 1148 switch (cflag & CSIZE) { 1149 case CS5: 1150 bits |= BITS_DATA_5; 1151 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1152 break; 1153 case CS6: 1154 bits |= BITS_DATA_6; 1155 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1156 break; 1157 case CS7: 1158 bits |= BITS_DATA_7; 1159 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1160 break; 1161 case CS8: 1162 default: 1163 bits |= BITS_DATA_8; 1164 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1165 break; 1166 } 1167 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1168 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1169 } 1170 1171 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1172 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1173 cp210x_get_line_ctl(port, &bits); 1174 bits &= ~BITS_PARITY_MASK; 1175 if (cflag & PARENB) { 1176 if (cflag & CMSPAR) { 1177 if (cflag & PARODD) { 1178 bits |= BITS_PARITY_MARK; 1179 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1180 } else { 1181 bits |= BITS_PARITY_SPACE; 1182 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1183 } 1184 } else { 1185 if (cflag & PARODD) { 1186 bits |= BITS_PARITY_ODD; 1187 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1188 } else { 1189 bits |= BITS_PARITY_EVEN; 1190 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1191 } 1192 } 1193 } 1194 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1195 dev_dbg(dev, "Parity mode not supported by device\n"); 1196 } 1197 1198 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1199 cp210x_get_line_ctl(port, &bits); 1200 bits &= ~BITS_STOP_MASK; 1201 if (cflag & CSTOPB) { 1202 bits |= BITS_STOP_2; 1203 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1204 } else { 1205 bits |= BITS_STOP_1; 1206 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1207 } 1208 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1209 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1210 } 1211 1212 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1213 struct cp210x_flow_ctl flow_ctl; 1214 u32 ctl_hs; 1215 u32 flow_repl; 1216 1217 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1218 sizeof(flow_ctl)); 1219 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1220 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1221 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1222 __func__, ctl_hs, flow_repl); 1223 1224 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1225 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1226 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1227 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1228 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1229 if (cflag & CRTSCTS) { 1230 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1231 1232 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1233 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1234 CP210X_SERIAL_RTS_FLOW_CTL); 1235 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1236 } else { 1237 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1238 1239 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1240 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1241 CP210X_SERIAL_RTS_ACTIVE); 1242 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1243 } 1244 1245 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1246 __func__, ctl_hs, flow_repl); 1247 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1248 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1249 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1250 sizeof(flow_ctl)); 1251 } 1252 1253 } 1254 1255 static int cp210x_tiocmset(struct tty_struct *tty, 1256 unsigned int set, unsigned int clear) 1257 { 1258 struct usb_serial_port *port = tty->driver_data; 1259 return cp210x_tiocmset_port(port, set, clear); 1260 } 1261 1262 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1263 unsigned int set, unsigned int clear) 1264 { 1265 u16 control = 0; 1266 1267 if (set & TIOCM_RTS) { 1268 control |= CONTROL_RTS; 1269 control |= CONTROL_WRITE_RTS; 1270 } 1271 if (set & TIOCM_DTR) { 1272 control |= CONTROL_DTR; 1273 control |= CONTROL_WRITE_DTR; 1274 } 1275 if (clear & TIOCM_RTS) { 1276 control &= ~CONTROL_RTS; 1277 control |= CONTROL_WRITE_RTS; 1278 } 1279 if (clear & TIOCM_DTR) { 1280 control &= ~CONTROL_DTR; 1281 control |= CONTROL_WRITE_DTR; 1282 } 1283 1284 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1285 1286 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1287 } 1288 1289 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1290 { 1291 if (on) 1292 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1293 else 1294 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1295 } 1296 1297 static int cp210x_tiocmget(struct tty_struct *tty) 1298 { 1299 struct usb_serial_port *port = tty->driver_data; 1300 u8 control; 1301 int result; 1302 1303 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1304 if (result) 1305 return result; 1306 1307 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1308 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1309 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1310 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1311 |((control & CONTROL_RING)? TIOCM_RI : 0) 1312 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1313 1314 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1315 1316 return result; 1317 } 1318 1319 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1320 { 1321 struct usb_serial_port *port = tty->driver_data; 1322 u16 state; 1323 1324 if (break_state == 0) 1325 state = BREAK_OFF; 1326 else 1327 state = BREAK_ON; 1328 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1329 state == BREAK_OFF ? "off" : "on"); 1330 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1331 } 1332 1333 #ifdef CONFIG_GPIOLIB 1334 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1335 { 1336 struct usb_serial *serial = gpiochip_get_data(gc); 1337 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1338 1339 if (priv->gpio_altfunc & BIT(offset)) 1340 return -ENODEV; 1341 1342 return 0; 1343 } 1344 1345 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1346 { 1347 struct usb_serial *serial = gpiochip_get_data(gc); 1348 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1349 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1350 int result; 1351 u8 buf; 1352 1353 if (priv->partnum == CP210X_PARTNUM_CP2105) 1354 req_type = REQTYPE_INTERFACE_TO_HOST; 1355 1356 result = cp210x_read_vendor_block(serial, req_type, 1357 CP210X_READ_LATCH, &buf, sizeof(buf)); 1358 if (result < 0) 1359 return result; 1360 1361 return !!(buf & BIT(gpio)); 1362 } 1363 1364 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1365 { 1366 struct usb_serial *serial = gpiochip_get_data(gc); 1367 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1368 struct cp210x_gpio_write buf; 1369 int result; 1370 1371 if (value == 1) 1372 buf.state = BIT(gpio); 1373 else 1374 buf.state = 0; 1375 1376 buf.mask = BIT(gpio); 1377 1378 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1379 result = cp210x_write_vendor_block(serial, 1380 REQTYPE_HOST_TO_INTERFACE, 1381 CP210X_WRITE_LATCH, &buf, 1382 sizeof(buf)); 1383 } else { 1384 u16 wIndex = buf.state << 8 | buf.mask; 1385 1386 result = usb_control_msg(serial->dev, 1387 usb_sndctrlpipe(serial->dev, 0), 1388 CP210X_VENDOR_SPECIFIC, 1389 REQTYPE_HOST_TO_DEVICE, 1390 CP210X_WRITE_LATCH, 1391 wIndex, 1392 NULL, 0, USB_CTRL_SET_TIMEOUT); 1393 } 1394 1395 if (result < 0) { 1396 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1397 result); 1398 } 1399 } 1400 1401 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1402 { 1403 struct usb_serial *serial = gpiochip_get_data(gc); 1404 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1405 1406 return priv->gpio_input & BIT(gpio); 1407 } 1408 1409 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1410 { 1411 struct usb_serial *serial = gpiochip_get_data(gc); 1412 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1413 1414 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1415 /* hardware does not support an input mode */ 1416 return -ENOTSUPP; 1417 } 1418 1419 /* push-pull pins cannot be changed to be inputs */ 1420 if (priv->gpio_pushpull & BIT(gpio)) 1421 return -EINVAL; 1422 1423 /* make sure to release pin if it is being driven low */ 1424 cp210x_gpio_set(gc, gpio, 1); 1425 1426 priv->gpio_input |= BIT(gpio); 1427 1428 return 0; 1429 } 1430 1431 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1432 int value) 1433 { 1434 struct usb_serial *serial = gpiochip_get_data(gc); 1435 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1436 1437 priv->gpio_input &= ~BIT(gpio); 1438 cp210x_gpio_set(gc, gpio, value); 1439 1440 return 0; 1441 } 1442 1443 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1444 unsigned long config) 1445 { 1446 struct usb_serial *serial = gpiochip_get_data(gc); 1447 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1448 enum pin_config_param param = pinconf_to_config_param(config); 1449 1450 /* Succeed only if in correct mode (this can't be set at runtime) */ 1451 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1452 (priv->gpio_pushpull & BIT(gpio))) 1453 return 0; 1454 1455 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1456 !(priv->gpio_pushpull & BIT(gpio))) 1457 return 0; 1458 1459 return -ENOTSUPP; 1460 } 1461 1462 /* 1463 * This function is for configuring GPIO using shared pins, where other signals 1464 * are made unavailable by configuring the use of GPIO. This is believed to be 1465 * only applicable to the cp2105 at this point, the other devices supported by 1466 * this driver that provide GPIO do so in a way that does not impact other 1467 * signals and are thus expected to have very different initialisation. 1468 */ 1469 static int cp2105_gpioconf_init(struct usb_serial *serial) 1470 { 1471 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1472 struct cp210x_pin_mode mode; 1473 struct cp210x_config config; 1474 u8 intf_num = cp210x_interface_num(serial); 1475 u8 iface_config; 1476 int result; 1477 1478 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1479 CP210X_GET_DEVICEMODE, &mode, 1480 sizeof(mode)); 1481 if (result < 0) 1482 return result; 1483 1484 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1485 CP210X_GET_PORTCONFIG, &config, 1486 sizeof(config)); 1487 if (result < 0) 1488 return result; 1489 1490 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1491 if (intf_num == 0) { 1492 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1493 /* mark all GPIOs of this interface as reserved */ 1494 priv->gpio_altfunc = 0xff; 1495 return 0; 1496 } 1497 1498 iface_config = config.eci_cfg; 1499 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1500 CP210X_ECI_GPIO_MODE_MASK) >> 1501 CP210X_ECI_GPIO_MODE_OFFSET); 1502 priv->gc.ngpio = 2; 1503 } else if (intf_num == 1) { 1504 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1505 /* mark all GPIOs of this interface as reserved */ 1506 priv->gpio_altfunc = 0xff; 1507 return 0; 1508 } 1509 1510 iface_config = config.sci_cfg; 1511 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1512 CP210X_SCI_GPIO_MODE_MASK) >> 1513 CP210X_SCI_GPIO_MODE_OFFSET); 1514 priv->gc.ngpio = 3; 1515 } else { 1516 return -ENODEV; 1517 } 1518 1519 /* mark all pins which are not in GPIO mode */ 1520 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1521 priv->gpio_altfunc |= BIT(0); 1522 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1523 CP2105_GPIO1_RS485_MODE)) 1524 priv->gpio_altfunc |= BIT(1); 1525 1526 /* driver implementation for CP2105 only supports outputs */ 1527 priv->gpio_input = 0; 1528 1529 return 0; 1530 } 1531 1532 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1533 { 1534 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1535 const u16 config_size = 0x02a6; 1536 u8 gpio_rst_latch; 1537 u8 config_version; 1538 u8 gpio_pushpull; 1539 u8 *config_buf; 1540 u8 gpio_latch; 1541 u8 gpio_ctrl; 1542 int result; 1543 u8 i; 1544 1545 /* 1546 * Retrieve device configuration from the device. 1547 * The array received contains all customization settings done at the 1548 * factory/manufacturer. Format of the array is documented at the 1549 * time of writing at: 1550 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1551 */ 1552 config_buf = kmalloc(config_size, GFP_KERNEL); 1553 if (!config_buf) 1554 return -ENOMEM; 1555 1556 result = cp210x_read_vendor_block(serial, 1557 REQTYPE_DEVICE_TO_HOST, 1558 CP210X_READ_2NCONFIG, 1559 config_buf, 1560 config_size); 1561 if (result < 0) { 1562 kfree(config_buf); 1563 return result; 1564 } 1565 1566 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1567 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1568 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1569 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1570 1571 kfree(config_buf); 1572 1573 /* Make sure this is a config format we understand. */ 1574 if (config_version != 0x01) 1575 return -ENOTSUPP; 1576 1577 /* 1578 * We only support 4 GPIOs even on the QFN28 package, because 1579 * config locations of GPIOs 4-6 determined using reverse 1580 * engineering revealed conflicting offsets with other 1581 * documented functions. So we'll just play it safe for now. 1582 */ 1583 priv->gc.ngpio = 4; 1584 1585 /* 1586 * Get default pin states after reset. Needed so we can determine 1587 * the direction of an open-drain pin. 1588 */ 1589 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1590 1591 /* 0 indicates open-drain mode, 1 is push-pull */ 1592 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1593 1594 /* 0 indicates GPIO mode, 1 is alternate function */ 1595 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1596 1597 /* 1598 * The CP2102N does not strictly has input and output pin modes, 1599 * it only knows open-drain and push-pull modes which is set at 1600 * factory. An open-drain pin can function both as an 1601 * input or an output. We emulate input mode for open-drain pins 1602 * by making sure they are not driven low, and we do not allow 1603 * push-pull pins to be set as an input. 1604 */ 1605 for (i = 0; i < priv->gc.ngpio; ++i) { 1606 /* 1607 * Set direction to "input" iff pin is open-drain and reset 1608 * value is 1. 1609 */ 1610 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1611 priv->gpio_input |= BIT(i); 1612 } 1613 1614 return 0; 1615 } 1616 1617 static int cp210x_gpio_init(struct usb_serial *serial) 1618 { 1619 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1620 int result; 1621 1622 switch (priv->partnum) { 1623 case CP210X_PARTNUM_CP2105: 1624 result = cp2105_gpioconf_init(serial); 1625 break; 1626 case CP210X_PARTNUM_CP2102N_QFN28: 1627 case CP210X_PARTNUM_CP2102N_QFN24: 1628 case CP210X_PARTNUM_CP2102N_QFN20: 1629 result = cp2102n_gpioconf_init(serial); 1630 break; 1631 default: 1632 return 0; 1633 } 1634 1635 if (result < 0) 1636 return result; 1637 1638 priv->gc.label = "cp210x"; 1639 priv->gc.request = cp210x_gpio_request; 1640 priv->gc.get_direction = cp210x_gpio_direction_get; 1641 priv->gc.direction_input = cp210x_gpio_direction_input; 1642 priv->gc.direction_output = cp210x_gpio_direction_output; 1643 priv->gc.get = cp210x_gpio_get; 1644 priv->gc.set = cp210x_gpio_set; 1645 priv->gc.set_config = cp210x_gpio_set_config; 1646 priv->gc.owner = THIS_MODULE; 1647 priv->gc.parent = &serial->interface->dev; 1648 priv->gc.base = -1; 1649 priv->gc.can_sleep = true; 1650 1651 result = gpiochip_add_data(&priv->gc, serial); 1652 if (!result) 1653 priv->gpio_registered = true; 1654 1655 return result; 1656 } 1657 1658 static void cp210x_gpio_remove(struct usb_serial *serial) 1659 { 1660 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1661 1662 if (priv->gpio_registered) { 1663 gpiochip_remove(&priv->gc); 1664 priv->gpio_registered = false; 1665 } 1666 } 1667 1668 #else 1669 1670 static int cp210x_gpio_init(struct usb_serial *serial) 1671 { 1672 return 0; 1673 } 1674 1675 static void cp210x_gpio_remove(struct usb_serial *serial) 1676 { 1677 /* Nothing to do */ 1678 } 1679 1680 #endif 1681 1682 static int cp210x_port_probe(struct usb_serial_port *port) 1683 { 1684 struct usb_serial *serial = port->serial; 1685 struct cp210x_port_private *port_priv; 1686 int ret; 1687 1688 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1689 if (!port_priv) 1690 return -ENOMEM; 1691 1692 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1693 1694 usb_set_serial_port_data(port, port_priv); 1695 1696 ret = cp210x_detect_swapped_line_ctl(port); 1697 if (ret) { 1698 kfree(port_priv); 1699 return ret; 1700 } 1701 1702 return 0; 1703 } 1704 1705 static int cp210x_port_remove(struct usb_serial_port *port) 1706 { 1707 struct cp210x_port_private *port_priv; 1708 1709 port_priv = usb_get_serial_port_data(port); 1710 kfree(port_priv); 1711 1712 return 0; 1713 } 1714 1715 static void cp210x_init_max_speed(struct usb_serial *serial) 1716 { 1717 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1718 bool use_actual_rate = false; 1719 speed_t max; 1720 1721 switch (priv->partnum) { 1722 case CP210X_PARTNUM_CP2101: 1723 max = 921600; 1724 break; 1725 case CP210X_PARTNUM_CP2102: 1726 case CP210X_PARTNUM_CP2103: 1727 max = 1000000; 1728 break; 1729 case CP210X_PARTNUM_CP2104: 1730 use_actual_rate = true; 1731 max = 2000000; 1732 break; 1733 case CP210X_PARTNUM_CP2108: 1734 max = 2000000; 1735 break; 1736 case CP210X_PARTNUM_CP2105: 1737 if (cp210x_interface_num(serial) == 0) { 1738 use_actual_rate = true; 1739 max = 2000000; /* ECI */ 1740 } else { 1741 max = 921600; /* SCI */ 1742 } 1743 break; 1744 case CP210X_PARTNUM_CP2102N_QFN28: 1745 case CP210X_PARTNUM_CP2102N_QFN24: 1746 case CP210X_PARTNUM_CP2102N_QFN20: 1747 use_actual_rate = true; 1748 max = 3000000; 1749 break; 1750 default: 1751 max = 2000000; 1752 break; 1753 } 1754 1755 priv->max_speed = max; 1756 priv->use_actual_rate = use_actual_rate; 1757 } 1758 1759 static int cp210x_attach(struct usb_serial *serial) 1760 { 1761 int result; 1762 struct cp210x_serial_private *priv; 1763 1764 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1765 if (!priv) 1766 return -ENOMEM; 1767 1768 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1769 CP210X_GET_PARTNUM, &priv->partnum, 1770 sizeof(priv->partnum)); 1771 if (result < 0) { 1772 dev_warn(&serial->interface->dev, 1773 "querying part number failed\n"); 1774 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1775 } 1776 1777 usb_set_serial_data(serial, priv); 1778 1779 cp210x_init_max_speed(serial); 1780 1781 result = cp210x_gpio_init(serial); 1782 if (result < 0) { 1783 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1784 result); 1785 } 1786 1787 return 0; 1788 } 1789 1790 static void cp210x_disconnect(struct usb_serial *serial) 1791 { 1792 cp210x_gpio_remove(serial); 1793 } 1794 1795 static void cp210x_release(struct usb_serial *serial) 1796 { 1797 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1798 1799 cp210x_gpio_remove(serial); 1800 1801 kfree(priv); 1802 } 1803 1804 module_usb_serial_driver(serial_drivers, id_table); 1805 1806 MODULE_DESCRIPTION(DRIVER_DESC); 1807 MODULE_LICENSE("GPL v2"); 1808