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(0x0B00, 0x3070) }, /* Ingenico 3070 */ 65 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 66 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 67 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 68 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 69 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 70 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 71 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 72 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 73 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 74 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 75 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 76 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 77 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 78 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 79 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 80 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 81 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 82 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 83 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 84 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 85 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 86 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 87 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 88 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 89 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 90 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 91 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 92 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 93 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 94 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 95 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 96 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 97 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 98 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 99 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 100 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 103 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 104 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 105 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 106 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 107 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 108 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 109 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 110 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 111 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 112 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 113 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 114 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 115 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 116 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 117 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 118 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 119 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 120 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 121 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 122 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 123 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 124 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 125 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 126 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 127 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 128 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 129 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 130 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 131 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 132 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 133 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 134 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 135 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 136 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 137 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 138 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 139 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 140 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 141 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 142 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 143 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 144 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 145 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 146 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 147 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 148 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 149 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 150 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 151 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 152 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 153 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 154 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 155 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 156 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 157 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 158 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 159 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 160 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 161 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 162 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 163 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 164 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 165 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 166 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 167 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 168 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 169 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 170 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 171 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 172 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 173 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 174 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 175 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 176 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 177 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 178 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 179 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 180 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 181 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 182 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 183 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 184 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 185 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 186 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 187 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 188 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 189 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 190 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 191 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 192 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 193 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 194 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 195 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 196 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 197 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 198 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 199 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 200 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 201 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 202 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 203 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 204 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 205 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 206 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 207 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 208 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 209 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 210 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 211 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 212 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 213 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 214 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 215 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 216 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 217 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 218 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 219 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 220 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 221 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 225 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 226 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 227 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 228 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 229 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 230 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 231 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 232 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 233 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 234 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 235 { } /* Terminating Entry */ 236 }; 237 238 MODULE_DEVICE_TABLE(usb, id_table); 239 240 struct cp210x_serial_private { 241 #ifdef CONFIG_GPIOLIB 242 struct gpio_chip gc; 243 bool gpio_registered; 244 u8 gpio_pushpull; 245 u8 gpio_altfunc; 246 u8 gpio_input; 247 #endif 248 u8 partnum; 249 speed_t min_speed; 250 speed_t max_speed; 251 bool use_actual_rate; 252 }; 253 254 struct cp210x_port_private { 255 __u8 bInterfaceNumber; 256 bool has_swapped_line_ctl; 257 }; 258 259 static struct usb_serial_driver cp210x_device = { 260 .driver = { 261 .owner = THIS_MODULE, 262 .name = "cp210x", 263 }, 264 .id_table = id_table, 265 .num_ports = 1, 266 .bulk_in_size = 256, 267 .bulk_out_size = 256, 268 .open = cp210x_open, 269 .close = cp210x_close, 270 .break_ctl = cp210x_break_ctl, 271 .set_termios = cp210x_set_termios, 272 .tx_empty = cp210x_tx_empty, 273 .tiocmget = cp210x_tiocmget, 274 .tiocmset = cp210x_tiocmset, 275 .attach = cp210x_attach, 276 .disconnect = cp210x_disconnect, 277 .release = cp210x_release, 278 .port_probe = cp210x_port_probe, 279 .port_remove = cp210x_port_remove, 280 .dtr_rts = cp210x_dtr_rts 281 }; 282 283 static struct usb_serial_driver * const serial_drivers[] = { 284 &cp210x_device, NULL 285 }; 286 287 /* Config request types */ 288 #define REQTYPE_HOST_TO_INTERFACE 0x41 289 #define REQTYPE_INTERFACE_TO_HOST 0xc1 290 #define REQTYPE_HOST_TO_DEVICE 0x40 291 #define REQTYPE_DEVICE_TO_HOST 0xc0 292 293 /* Config request codes */ 294 #define CP210X_IFC_ENABLE 0x00 295 #define CP210X_SET_BAUDDIV 0x01 296 #define CP210X_GET_BAUDDIV 0x02 297 #define CP210X_SET_LINE_CTL 0x03 298 #define CP210X_GET_LINE_CTL 0x04 299 #define CP210X_SET_BREAK 0x05 300 #define CP210X_IMM_CHAR 0x06 301 #define CP210X_SET_MHS 0x07 302 #define CP210X_GET_MDMSTS 0x08 303 #define CP210X_SET_XON 0x09 304 #define CP210X_SET_XOFF 0x0A 305 #define CP210X_SET_EVENTMASK 0x0B 306 #define CP210X_GET_EVENTMASK 0x0C 307 #define CP210X_SET_CHAR 0x0D 308 #define CP210X_GET_CHARS 0x0E 309 #define CP210X_GET_PROPS 0x0F 310 #define CP210X_GET_COMM_STATUS 0x10 311 #define CP210X_RESET 0x11 312 #define CP210X_PURGE 0x12 313 #define CP210X_SET_FLOW 0x13 314 #define CP210X_GET_FLOW 0x14 315 #define CP210X_EMBED_EVENTS 0x15 316 #define CP210X_GET_EVENTSTATE 0x16 317 #define CP210X_SET_CHARS 0x19 318 #define CP210X_GET_BAUDRATE 0x1D 319 #define CP210X_SET_BAUDRATE 0x1E 320 #define CP210X_VENDOR_SPECIFIC 0xFF 321 322 /* CP210X_IFC_ENABLE */ 323 #define UART_ENABLE 0x0001 324 #define UART_DISABLE 0x0000 325 326 /* CP210X_(SET|GET)_BAUDDIV */ 327 #define BAUD_RATE_GEN_FREQ 0x384000 328 329 /* CP210X_(SET|GET)_LINE_CTL */ 330 #define BITS_DATA_MASK 0X0f00 331 #define BITS_DATA_5 0X0500 332 #define BITS_DATA_6 0X0600 333 #define BITS_DATA_7 0X0700 334 #define BITS_DATA_8 0X0800 335 #define BITS_DATA_9 0X0900 336 337 #define BITS_PARITY_MASK 0x00f0 338 #define BITS_PARITY_NONE 0x0000 339 #define BITS_PARITY_ODD 0x0010 340 #define BITS_PARITY_EVEN 0x0020 341 #define BITS_PARITY_MARK 0x0030 342 #define BITS_PARITY_SPACE 0x0040 343 344 #define BITS_STOP_MASK 0x000f 345 #define BITS_STOP_1 0x0000 346 #define BITS_STOP_1_5 0x0001 347 #define BITS_STOP_2 0x0002 348 349 /* CP210X_SET_BREAK */ 350 #define BREAK_ON 0x0001 351 #define BREAK_OFF 0x0000 352 353 /* CP210X_(SET_MHS|GET_MDMSTS) */ 354 #define CONTROL_DTR 0x0001 355 #define CONTROL_RTS 0x0002 356 #define CONTROL_CTS 0x0010 357 #define CONTROL_DSR 0x0020 358 #define CONTROL_RING 0x0040 359 #define CONTROL_DCD 0x0080 360 #define CONTROL_WRITE_DTR 0x0100 361 #define CONTROL_WRITE_RTS 0x0200 362 363 /* CP210X_VENDOR_SPECIFIC values */ 364 #define CP210X_READ_2NCONFIG 0x000E 365 #define CP210X_READ_LATCH 0x00C2 366 #define CP210X_GET_PARTNUM 0x370B 367 #define CP210X_GET_PORTCONFIG 0x370C 368 #define CP210X_GET_DEVICEMODE 0x3711 369 #define CP210X_WRITE_LATCH 0x37E1 370 371 /* Part number definitions */ 372 #define CP210X_PARTNUM_CP2101 0x01 373 #define CP210X_PARTNUM_CP2102 0x02 374 #define CP210X_PARTNUM_CP2103 0x03 375 #define CP210X_PARTNUM_CP2104 0x04 376 #define CP210X_PARTNUM_CP2105 0x05 377 #define CP210X_PARTNUM_CP2108 0x08 378 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 379 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 380 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 381 #define CP210X_PARTNUM_UNKNOWN 0xFF 382 383 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 384 struct cp210x_comm_status { 385 __le32 ulErrors; 386 __le32 ulHoldReasons; 387 __le32 ulAmountInInQueue; 388 __le32 ulAmountInOutQueue; 389 u8 bEofReceived; 390 u8 bWaitForImmediate; 391 u8 bReserved; 392 } __packed; 393 394 /* 395 * CP210X_PURGE - 16 bits passed in wValue of USB request. 396 * SiLabs app note AN571 gives a strange description of the 4 bits: 397 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 398 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 399 */ 400 #define PURGE_ALL 0x000f 401 402 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 403 struct cp210x_flow_ctl { 404 __le32 ulControlHandshake; 405 __le32 ulFlowReplace; 406 __le32 ulXonLimit; 407 __le32 ulXoffLimit; 408 } __packed; 409 410 /* cp210x_flow_ctl::ulControlHandshake */ 411 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 412 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 413 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 414 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 415 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 416 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 417 418 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 419 #define CP210X_SERIAL_DTR_INACTIVE 0 420 #define CP210X_SERIAL_DTR_ACTIVE 1 421 #define CP210X_SERIAL_DTR_FLOW_CTL 2 422 423 /* cp210x_flow_ctl::ulFlowReplace */ 424 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 425 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 426 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 427 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 428 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 429 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 430 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 431 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 432 433 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 434 #define CP210X_SERIAL_RTS_INACTIVE 0 435 #define CP210X_SERIAL_RTS_ACTIVE 1 436 #define CP210X_SERIAL_RTS_FLOW_CTL 2 437 438 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 439 struct cp210x_pin_mode { 440 u8 eci; 441 u8 sci; 442 } __packed; 443 444 #define CP210X_PIN_MODE_MODEM 0 445 #define CP210X_PIN_MODE_GPIO BIT(0) 446 447 /* 448 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 449 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 450 */ 451 struct cp210x_dual_port_config { 452 __le16 gpio_mode; 453 u8 __pad0[2]; 454 __le16 reset_state; 455 u8 __pad1[4]; 456 __le16 suspend_state; 457 u8 sci_cfg; 458 u8 eci_cfg; 459 u8 device_cfg; 460 } __packed; 461 462 /* 463 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 464 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 465 */ 466 struct cp210x_single_port_config { 467 __le16 gpio_mode; 468 u8 __pad0[2]; 469 __le16 reset_state; 470 u8 __pad1[4]; 471 __le16 suspend_state; 472 u8 device_cfg; 473 } __packed; 474 475 /* GPIO modes */ 476 #define CP210X_SCI_GPIO_MODE_OFFSET 9 477 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 478 479 #define CP210X_ECI_GPIO_MODE_OFFSET 2 480 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 481 482 #define CP210X_GPIO_MODE_OFFSET 8 483 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 484 485 /* CP2105 port configuration values */ 486 #define CP2105_GPIO0_TXLED_MODE BIT(0) 487 #define CP2105_GPIO1_RXLED_MODE BIT(1) 488 #define CP2105_GPIO1_RS485_MODE BIT(2) 489 490 /* CP2104 port configuration values */ 491 #define CP2104_GPIO0_TXLED_MODE BIT(0) 492 #define CP2104_GPIO1_RXLED_MODE BIT(1) 493 #define CP2104_GPIO2_RS485_MODE BIT(2) 494 495 /* CP2102N configuration array indices */ 496 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 497 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 498 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 499 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 500 501 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 502 struct cp210x_gpio_write { 503 u8 mask; 504 u8 state; 505 } __packed; 506 507 /* 508 * Helper to get interface number when we only have struct usb_serial. 509 */ 510 static u8 cp210x_interface_num(struct usb_serial *serial) 511 { 512 struct usb_host_interface *cur_altsetting; 513 514 cur_altsetting = serial->interface->cur_altsetting; 515 516 return cur_altsetting->desc.bInterfaceNumber; 517 } 518 519 /* 520 * Reads a variable-sized block of CP210X_ registers, identified by req. 521 * Returns data into buf in native USB byte order. 522 */ 523 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 524 void *buf, int bufsize) 525 { 526 struct usb_serial *serial = port->serial; 527 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 528 void *dmabuf; 529 int result; 530 531 dmabuf = kmalloc(bufsize, GFP_KERNEL); 532 if (!dmabuf) { 533 /* 534 * FIXME Some callers don't bother to check for error, 535 * at least give them consistent junk until they are fixed 536 */ 537 memset(buf, 0, bufsize); 538 return -ENOMEM; 539 } 540 541 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 542 req, REQTYPE_INTERFACE_TO_HOST, 0, 543 port_priv->bInterfaceNumber, dmabuf, bufsize, 544 USB_CTRL_SET_TIMEOUT); 545 if (result == bufsize) { 546 memcpy(buf, dmabuf, bufsize); 547 result = 0; 548 } else { 549 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 550 req, bufsize, result); 551 if (result >= 0) 552 result = -EIO; 553 554 /* 555 * FIXME Some callers don't bother to check for error, 556 * at least give them consistent junk until they are fixed 557 */ 558 memset(buf, 0, bufsize); 559 } 560 561 kfree(dmabuf); 562 563 return result; 564 } 565 566 /* 567 * Reads any 32-bit CP210X_ register identified by req. 568 */ 569 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 570 { 571 __le32 le32_val; 572 int err; 573 574 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 575 if (err) { 576 /* 577 * FIXME Some callers don't bother to check for error, 578 * at least give them consistent junk until they are fixed 579 */ 580 *val = 0; 581 return err; 582 } 583 584 *val = le32_to_cpu(le32_val); 585 586 return 0; 587 } 588 589 /* 590 * Reads any 16-bit CP210X_ register identified by req. 591 */ 592 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 593 { 594 __le16 le16_val; 595 int err; 596 597 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 598 if (err) 599 return err; 600 601 *val = le16_to_cpu(le16_val); 602 603 return 0; 604 } 605 606 /* 607 * Reads any 8-bit CP210X_ register identified by req. 608 */ 609 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 610 { 611 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 612 } 613 614 /* 615 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 616 * Returns data into buf in native USB byte order. 617 */ 618 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 619 void *buf, int bufsize) 620 { 621 void *dmabuf; 622 int result; 623 624 dmabuf = kmalloc(bufsize, GFP_KERNEL); 625 if (!dmabuf) 626 return -ENOMEM; 627 628 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 629 CP210X_VENDOR_SPECIFIC, type, val, 630 cp210x_interface_num(serial), dmabuf, bufsize, 631 USB_CTRL_GET_TIMEOUT); 632 if (result == bufsize) { 633 memcpy(buf, dmabuf, bufsize); 634 result = 0; 635 } else { 636 dev_err(&serial->interface->dev, 637 "failed to get vendor val 0x%04x size %d: %d\n", val, 638 bufsize, result); 639 if (result >= 0) 640 result = -EIO; 641 } 642 643 kfree(dmabuf); 644 645 return result; 646 } 647 648 /* 649 * Writes any 16-bit CP210X_ register (req) whose value is passed 650 * entirely in the wValue field of the USB request. 651 */ 652 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 653 { 654 struct usb_serial *serial = port->serial; 655 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 656 int result; 657 658 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 659 req, REQTYPE_HOST_TO_INTERFACE, val, 660 port_priv->bInterfaceNumber, NULL, 0, 661 USB_CTRL_SET_TIMEOUT); 662 if (result < 0) { 663 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 664 req, result); 665 } 666 667 return result; 668 } 669 670 /* 671 * Writes a variable-sized block of CP210X_ registers, identified by req. 672 * Data in buf must be in native USB byte order. 673 */ 674 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 675 void *buf, int bufsize) 676 { 677 struct usb_serial *serial = port->serial; 678 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 679 void *dmabuf; 680 int result; 681 682 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 683 if (!dmabuf) 684 return -ENOMEM; 685 686 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 687 req, REQTYPE_HOST_TO_INTERFACE, 0, 688 port_priv->bInterfaceNumber, dmabuf, bufsize, 689 USB_CTRL_SET_TIMEOUT); 690 691 kfree(dmabuf); 692 693 if (result == bufsize) { 694 result = 0; 695 } else { 696 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 697 req, bufsize, result); 698 if (result >= 0) 699 result = -EIO; 700 } 701 702 return result; 703 } 704 705 /* 706 * Writes any 32-bit CP210X_ register identified by req. 707 */ 708 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 709 { 710 __le32 le32_val; 711 712 le32_val = cpu_to_le32(val); 713 714 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 715 } 716 717 #ifdef CONFIG_GPIOLIB 718 /* 719 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 720 * Data in buf must be in native USB byte order. 721 */ 722 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 723 u16 val, void *buf, int bufsize) 724 { 725 void *dmabuf; 726 int result; 727 728 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 729 if (!dmabuf) 730 return -ENOMEM; 731 732 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 733 CP210X_VENDOR_SPECIFIC, type, val, 734 cp210x_interface_num(serial), dmabuf, bufsize, 735 USB_CTRL_SET_TIMEOUT); 736 737 kfree(dmabuf); 738 739 if (result == bufsize) { 740 result = 0; 741 } else { 742 dev_err(&serial->interface->dev, 743 "failed to set vendor val 0x%04x size %d: %d\n", val, 744 bufsize, result); 745 if (result >= 0) 746 result = -EIO; 747 } 748 749 return result; 750 } 751 #endif 752 753 /* 754 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 755 * Write a known good value 0x800, read it back. 756 * If it comes back swapped the bug is detected. 757 * Preserve the original register value. 758 */ 759 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 760 { 761 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 762 u16 line_ctl_save; 763 u16 line_ctl_test; 764 int err; 765 766 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 767 if (err) 768 return err; 769 770 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 771 if (err) 772 return err; 773 774 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 775 if (err) 776 return err; 777 778 if (line_ctl_test == 8) { 779 port_priv->has_swapped_line_ctl = true; 780 line_ctl_save = swab16(line_ctl_save); 781 } 782 783 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 784 } 785 786 /* 787 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 788 * to workaround cp2108 bug and get correct value. 789 */ 790 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 791 { 792 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 793 int err; 794 795 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 796 if (err) 797 return err; 798 799 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 800 if (port_priv->has_swapped_line_ctl) 801 *ctl = swab16(*ctl); 802 803 return 0; 804 } 805 806 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 807 { 808 int result; 809 810 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 811 if (result) { 812 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 813 return result; 814 } 815 816 /* Configure the termios structure */ 817 cp210x_get_termios(tty, port); 818 819 /* The baud rate must be initialised on cp2104 */ 820 if (tty) 821 cp210x_change_speed(tty, port, NULL); 822 823 return usb_serial_generic_open(tty, port); 824 } 825 826 static void cp210x_close(struct usb_serial_port *port) 827 { 828 usb_serial_generic_close(port); 829 830 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 831 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 832 833 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 834 } 835 836 /* 837 * Read how many bytes are waiting in the TX queue. 838 */ 839 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 840 u32 *count) 841 { 842 struct usb_serial *serial = port->serial; 843 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 844 struct cp210x_comm_status *sts; 845 int result; 846 847 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 848 if (!sts) 849 return -ENOMEM; 850 851 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 852 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 853 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 854 USB_CTRL_GET_TIMEOUT); 855 if (result == sizeof(*sts)) { 856 *count = le32_to_cpu(sts->ulAmountInOutQueue); 857 result = 0; 858 } else { 859 dev_err(&port->dev, "failed to get comm status: %d\n", result); 860 if (result >= 0) 861 result = -EIO; 862 } 863 864 kfree(sts); 865 866 return result; 867 } 868 869 static bool cp210x_tx_empty(struct usb_serial_port *port) 870 { 871 int err; 872 u32 count; 873 874 err = cp210x_get_tx_queue_byte_count(port, &count); 875 if (err) 876 return true; 877 878 return !count; 879 } 880 881 /* 882 * cp210x_get_termios 883 * Reads the baud rate, data bits, parity, stop bits and flow control mode 884 * from the device, corrects any unsupported values, and configures the 885 * termios structure to reflect the state of the device 886 */ 887 static void cp210x_get_termios(struct tty_struct *tty, 888 struct usb_serial_port *port) 889 { 890 unsigned int baud; 891 892 if (tty) { 893 cp210x_get_termios_port(tty->driver_data, 894 &tty->termios.c_cflag, &baud); 895 tty_encode_baud_rate(tty, baud, baud); 896 } else { 897 tcflag_t cflag; 898 cflag = 0; 899 cp210x_get_termios_port(port, &cflag, &baud); 900 } 901 } 902 903 /* 904 * cp210x_get_termios_port 905 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 906 */ 907 static void cp210x_get_termios_port(struct usb_serial_port *port, 908 tcflag_t *cflagp, unsigned int *baudp) 909 { 910 struct device *dev = &port->dev; 911 tcflag_t cflag; 912 struct cp210x_flow_ctl flow_ctl; 913 u32 baud; 914 u16 bits; 915 u32 ctl_hs; 916 917 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 918 919 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 920 *baudp = baud; 921 922 cflag = *cflagp; 923 924 cp210x_get_line_ctl(port, &bits); 925 cflag &= ~CSIZE; 926 switch (bits & BITS_DATA_MASK) { 927 case BITS_DATA_5: 928 dev_dbg(dev, "%s - data bits = 5\n", __func__); 929 cflag |= CS5; 930 break; 931 case BITS_DATA_6: 932 dev_dbg(dev, "%s - data bits = 6\n", __func__); 933 cflag |= CS6; 934 break; 935 case BITS_DATA_7: 936 dev_dbg(dev, "%s - data bits = 7\n", __func__); 937 cflag |= CS7; 938 break; 939 case BITS_DATA_8: 940 dev_dbg(dev, "%s - data bits = 8\n", __func__); 941 cflag |= CS8; 942 break; 943 case BITS_DATA_9: 944 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 945 cflag |= CS8; 946 bits &= ~BITS_DATA_MASK; 947 bits |= BITS_DATA_8; 948 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 949 break; 950 default: 951 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 952 cflag |= CS8; 953 bits &= ~BITS_DATA_MASK; 954 bits |= BITS_DATA_8; 955 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 956 break; 957 } 958 959 switch (bits & BITS_PARITY_MASK) { 960 case BITS_PARITY_NONE: 961 dev_dbg(dev, "%s - parity = NONE\n", __func__); 962 cflag &= ~PARENB; 963 break; 964 case BITS_PARITY_ODD: 965 dev_dbg(dev, "%s - parity = ODD\n", __func__); 966 cflag |= (PARENB|PARODD); 967 break; 968 case BITS_PARITY_EVEN: 969 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 970 cflag &= ~PARODD; 971 cflag |= PARENB; 972 break; 973 case BITS_PARITY_MARK: 974 dev_dbg(dev, "%s - parity = MARK\n", __func__); 975 cflag |= (PARENB|PARODD|CMSPAR); 976 break; 977 case BITS_PARITY_SPACE: 978 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 979 cflag &= ~PARODD; 980 cflag |= (PARENB|CMSPAR); 981 break; 982 default: 983 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 984 cflag &= ~PARENB; 985 bits &= ~BITS_PARITY_MASK; 986 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 987 break; 988 } 989 990 cflag &= ~CSTOPB; 991 switch (bits & BITS_STOP_MASK) { 992 case BITS_STOP_1: 993 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 994 break; 995 case BITS_STOP_1_5: 996 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 997 bits &= ~BITS_STOP_MASK; 998 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 999 break; 1000 case BITS_STOP_2: 1001 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1002 cflag |= CSTOPB; 1003 break; 1004 default: 1005 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 1006 bits &= ~BITS_STOP_MASK; 1007 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1008 break; 1009 } 1010 1011 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1012 sizeof(flow_ctl)); 1013 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1014 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1015 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1016 cflag |= CRTSCTS; 1017 } else { 1018 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1019 cflag &= ~CRTSCTS; 1020 } 1021 1022 *cflagp = cflag; 1023 } 1024 1025 struct cp210x_rate { 1026 speed_t rate; 1027 speed_t high; 1028 }; 1029 1030 static const struct cp210x_rate cp210x_an205_table1[] = { 1031 { 300, 300 }, 1032 { 600, 600 }, 1033 { 1200, 1200 }, 1034 { 1800, 1800 }, 1035 { 2400, 2400 }, 1036 { 4000, 4000 }, 1037 { 4800, 4803 }, 1038 { 7200, 7207 }, 1039 { 9600, 9612 }, 1040 { 14400, 14428 }, 1041 { 16000, 16062 }, 1042 { 19200, 19250 }, 1043 { 28800, 28912 }, 1044 { 38400, 38601 }, 1045 { 51200, 51558 }, 1046 { 56000, 56280 }, 1047 { 57600, 58053 }, 1048 { 64000, 64111 }, 1049 { 76800, 77608 }, 1050 { 115200, 117028 }, 1051 { 128000, 129347 }, 1052 { 153600, 156868 }, 1053 { 230400, 237832 }, 1054 { 250000, 254234 }, 1055 { 256000, 273066 }, 1056 { 460800, 491520 }, 1057 { 500000, 567138 }, 1058 { 576000, 670254 }, 1059 { 921600, UINT_MAX } 1060 }; 1061 1062 /* 1063 * Quantises the baud rate as per AN205 Table 1 1064 */ 1065 static speed_t cp210x_get_an205_rate(speed_t baud) 1066 { 1067 int i; 1068 1069 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1070 if (baud <= cp210x_an205_table1[i].high) 1071 break; 1072 } 1073 1074 return cp210x_an205_table1[i].rate; 1075 } 1076 1077 static speed_t cp210x_get_actual_rate(speed_t baud) 1078 { 1079 unsigned int prescale = 1; 1080 unsigned int div; 1081 1082 if (baud <= 365) 1083 prescale = 4; 1084 1085 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1086 baud = 48000000 / (2 * prescale * div); 1087 1088 return baud; 1089 } 1090 1091 /* 1092 * CP2101 supports the following baud rates: 1093 * 1094 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1095 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1096 * 1097 * CP2102 and CP2103 support the following additional rates: 1098 * 1099 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1100 * 576000 1101 * 1102 * The device will map a requested rate to a supported one, but the result 1103 * of requests for rates greater than 1053257 is undefined (see AN205). 1104 * 1105 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1106 * respectively, with an error less than 1%. The actual rates are determined 1107 * by 1108 * 1109 * div = round(freq / (2 x prescale x request)) 1110 * actual = freq / (2 x prescale x div) 1111 * 1112 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1113 * or 1 otherwise. 1114 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1115 * otherwise. 1116 */ 1117 static void cp210x_change_speed(struct tty_struct *tty, 1118 struct usb_serial_port *port, struct ktermios *old_termios) 1119 { 1120 struct usb_serial *serial = port->serial; 1121 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1122 u32 baud; 1123 1124 /* 1125 * This maps the requested rate to the actual rate, a valid rate on 1126 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1127 * 1128 * NOTE: B0 is not implemented. 1129 */ 1130 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1131 1132 if (priv->use_actual_rate) 1133 baud = cp210x_get_actual_rate(baud); 1134 else if (baud < 1000000) 1135 baud = cp210x_get_an205_rate(baud); 1136 1137 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1138 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1139 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1140 if (old_termios) 1141 baud = old_termios->c_ospeed; 1142 else 1143 baud = 9600; 1144 } 1145 1146 tty_encode_baud_rate(tty, baud, baud); 1147 } 1148 1149 static void cp210x_set_termios(struct tty_struct *tty, 1150 struct usb_serial_port *port, struct ktermios *old_termios) 1151 { 1152 struct device *dev = &port->dev; 1153 unsigned int cflag, old_cflag; 1154 u16 bits; 1155 1156 cflag = tty->termios.c_cflag; 1157 old_cflag = old_termios->c_cflag; 1158 1159 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1160 cp210x_change_speed(tty, port, old_termios); 1161 1162 /* If the number of data bits is to be updated */ 1163 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1164 cp210x_get_line_ctl(port, &bits); 1165 bits &= ~BITS_DATA_MASK; 1166 switch (cflag & CSIZE) { 1167 case CS5: 1168 bits |= BITS_DATA_5; 1169 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1170 break; 1171 case CS6: 1172 bits |= BITS_DATA_6; 1173 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1174 break; 1175 case CS7: 1176 bits |= BITS_DATA_7; 1177 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1178 break; 1179 case CS8: 1180 default: 1181 bits |= BITS_DATA_8; 1182 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1183 break; 1184 } 1185 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1186 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1187 } 1188 1189 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1190 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1191 cp210x_get_line_ctl(port, &bits); 1192 bits &= ~BITS_PARITY_MASK; 1193 if (cflag & PARENB) { 1194 if (cflag & CMSPAR) { 1195 if (cflag & PARODD) { 1196 bits |= BITS_PARITY_MARK; 1197 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1198 } else { 1199 bits |= BITS_PARITY_SPACE; 1200 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1201 } 1202 } else { 1203 if (cflag & PARODD) { 1204 bits |= BITS_PARITY_ODD; 1205 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1206 } else { 1207 bits |= BITS_PARITY_EVEN; 1208 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1209 } 1210 } 1211 } 1212 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1213 dev_dbg(dev, "Parity mode not supported by device\n"); 1214 } 1215 1216 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1217 cp210x_get_line_ctl(port, &bits); 1218 bits &= ~BITS_STOP_MASK; 1219 if (cflag & CSTOPB) { 1220 bits |= BITS_STOP_2; 1221 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1222 } else { 1223 bits |= BITS_STOP_1; 1224 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1225 } 1226 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1227 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1228 } 1229 1230 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1231 struct cp210x_flow_ctl flow_ctl; 1232 u32 ctl_hs; 1233 u32 flow_repl; 1234 1235 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1236 sizeof(flow_ctl)); 1237 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1238 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1239 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1240 __func__, ctl_hs, flow_repl); 1241 1242 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1243 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1244 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1245 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1246 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1247 if (cflag & CRTSCTS) { 1248 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1249 1250 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1251 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1252 CP210X_SERIAL_RTS_FLOW_CTL); 1253 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1254 } else { 1255 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1256 1257 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1258 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1259 CP210X_SERIAL_RTS_ACTIVE); 1260 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1261 } 1262 1263 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1264 __func__, ctl_hs, flow_repl); 1265 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1266 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1267 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1268 sizeof(flow_ctl)); 1269 } 1270 1271 } 1272 1273 static int cp210x_tiocmset(struct tty_struct *tty, 1274 unsigned int set, unsigned int clear) 1275 { 1276 struct usb_serial_port *port = tty->driver_data; 1277 return cp210x_tiocmset_port(port, set, clear); 1278 } 1279 1280 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1281 unsigned int set, unsigned int clear) 1282 { 1283 u16 control = 0; 1284 1285 if (set & TIOCM_RTS) { 1286 control |= CONTROL_RTS; 1287 control |= CONTROL_WRITE_RTS; 1288 } 1289 if (set & TIOCM_DTR) { 1290 control |= CONTROL_DTR; 1291 control |= CONTROL_WRITE_DTR; 1292 } 1293 if (clear & TIOCM_RTS) { 1294 control &= ~CONTROL_RTS; 1295 control |= CONTROL_WRITE_RTS; 1296 } 1297 if (clear & TIOCM_DTR) { 1298 control &= ~CONTROL_DTR; 1299 control |= CONTROL_WRITE_DTR; 1300 } 1301 1302 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1303 1304 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1305 } 1306 1307 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1308 { 1309 if (on) 1310 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1311 else 1312 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1313 } 1314 1315 static int cp210x_tiocmget(struct tty_struct *tty) 1316 { 1317 struct usb_serial_port *port = tty->driver_data; 1318 u8 control; 1319 int result; 1320 1321 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1322 if (result) 1323 return result; 1324 1325 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1326 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1327 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1328 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1329 |((control & CONTROL_RING)? TIOCM_RI : 0) 1330 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1331 1332 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1333 1334 return result; 1335 } 1336 1337 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1338 { 1339 struct usb_serial_port *port = tty->driver_data; 1340 u16 state; 1341 1342 if (break_state == 0) 1343 state = BREAK_OFF; 1344 else 1345 state = BREAK_ON; 1346 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1347 state == BREAK_OFF ? "off" : "on"); 1348 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1349 } 1350 1351 #ifdef CONFIG_GPIOLIB 1352 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1353 { 1354 struct usb_serial *serial = gpiochip_get_data(gc); 1355 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1356 1357 if (priv->gpio_altfunc & BIT(offset)) 1358 return -ENODEV; 1359 1360 return 0; 1361 } 1362 1363 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1364 { 1365 struct usb_serial *serial = gpiochip_get_data(gc); 1366 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1367 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1368 int result; 1369 u8 buf; 1370 1371 if (priv->partnum == CP210X_PARTNUM_CP2105) 1372 req_type = REQTYPE_INTERFACE_TO_HOST; 1373 1374 result = usb_autopm_get_interface(serial->interface); 1375 if (result) 1376 return result; 1377 1378 result = cp210x_read_vendor_block(serial, req_type, 1379 CP210X_READ_LATCH, &buf, sizeof(buf)); 1380 usb_autopm_put_interface(serial->interface); 1381 if (result < 0) 1382 return result; 1383 1384 return !!(buf & BIT(gpio)); 1385 } 1386 1387 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1388 { 1389 struct usb_serial *serial = gpiochip_get_data(gc); 1390 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1391 struct cp210x_gpio_write buf; 1392 int result; 1393 1394 if (value == 1) 1395 buf.state = BIT(gpio); 1396 else 1397 buf.state = 0; 1398 1399 buf.mask = BIT(gpio); 1400 1401 result = usb_autopm_get_interface(serial->interface); 1402 if (result) 1403 goto out; 1404 1405 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1406 result = cp210x_write_vendor_block(serial, 1407 REQTYPE_HOST_TO_INTERFACE, 1408 CP210X_WRITE_LATCH, &buf, 1409 sizeof(buf)); 1410 } else { 1411 u16 wIndex = buf.state << 8 | buf.mask; 1412 1413 result = usb_control_msg(serial->dev, 1414 usb_sndctrlpipe(serial->dev, 0), 1415 CP210X_VENDOR_SPECIFIC, 1416 REQTYPE_HOST_TO_DEVICE, 1417 CP210X_WRITE_LATCH, 1418 wIndex, 1419 NULL, 0, USB_CTRL_SET_TIMEOUT); 1420 } 1421 1422 usb_autopm_put_interface(serial->interface); 1423 out: 1424 if (result < 0) { 1425 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1426 result); 1427 } 1428 } 1429 1430 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1431 { 1432 struct usb_serial *serial = gpiochip_get_data(gc); 1433 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1434 1435 return priv->gpio_input & BIT(gpio); 1436 } 1437 1438 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1439 { 1440 struct usb_serial *serial = gpiochip_get_data(gc); 1441 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1442 1443 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1444 /* hardware does not support an input mode */ 1445 return -ENOTSUPP; 1446 } 1447 1448 /* push-pull pins cannot be changed to be inputs */ 1449 if (priv->gpio_pushpull & BIT(gpio)) 1450 return -EINVAL; 1451 1452 /* make sure to release pin if it is being driven low */ 1453 cp210x_gpio_set(gc, gpio, 1); 1454 1455 priv->gpio_input |= BIT(gpio); 1456 1457 return 0; 1458 } 1459 1460 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1461 int value) 1462 { 1463 struct usb_serial *serial = gpiochip_get_data(gc); 1464 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1465 1466 priv->gpio_input &= ~BIT(gpio); 1467 cp210x_gpio_set(gc, gpio, value); 1468 1469 return 0; 1470 } 1471 1472 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1473 unsigned long config) 1474 { 1475 struct usb_serial *serial = gpiochip_get_data(gc); 1476 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1477 enum pin_config_param param = pinconf_to_config_param(config); 1478 1479 /* Succeed only if in correct mode (this can't be set at runtime) */ 1480 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1481 (priv->gpio_pushpull & BIT(gpio))) 1482 return 0; 1483 1484 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1485 !(priv->gpio_pushpull & BIT(gpio))) 1486 return 0; 1487 1488 return -ENOTSUPP; 1489 } 1490 1491 /* 1492 * This function is for configuring GPIO using shared pins, where other signals 1493 * are made unavailable by configuring the use of GPIO. This is believed to be 1494 * only applicable to the cp2105 at this point, the other devices supported by 1495 * this driver that provide GPIO do so in a way that does not impact other 1496 * signals and are thus expected to have very different initialisation. 1497 */ 1498 static int cp2105_gpioconf_init(struct usb_serial *serial) 1499 { 1500 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1501 struct cp210x_pin_mode mode; 1502 struct cp210x_dual_port_config config; 1503 u8 intf_num = cp210x_interface_num(serial); 1504 u8 iface_config; 1505 int result; 1506 1507 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1508 CP210X_GET_DEVICEMODE, &mode, 1509 sizeof(mode)); 1510 if (result < 0) 1511 return result; 1512 1513 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1514 CP210X_GET_PORTCONFIG, &config, 1515 sizeof(config)); 1516 if (result < 0) 1517 return result; 1518 1519 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1520 if (intf_num == 0) { 1521 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1522 /* mark all GPIOs of this interface as reserved */ 1523 priv->gpio_altfunc = 0xff; 1524 return 0; 1525 } 1526 1527 iface_config = config.eci_cfg; 1528 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1529 CP210X_ECI_GPIO_MODE_MASK) >> 1530 CP210X_ECI_GPIO_MODE_OFFSET); 1531 priv->gc.ngpio = 2; 1532 } else if (intf_num == 1) { 1533 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1534 /* mark all GPIOs of this interface as reserved */ 1535 priv->gpio_altfunc = 0xff; 1536 return 0; 1537 } 1538 1539 iface_config = config.sci_cfg; 1540 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1541 CP210X_SCI_GPIO_MODE_MASK) >> 1542 CP210X_SCI_GPIO_MODE_OFFSET); 1543 priv->gc.ngpio = 3; 1544 } else { 1545 return -ENODEV; 1546 } 1547 1548 /* mark all pins which are not in GPIO mode */ 1549 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1550 priv->gpio_altfunc |= BIT(0); 1551 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1552 CP2105_GPIO1_RS485_MODE)) 1553 priv->gpio_altfunc |= BIT(1); 1554 1555 /* driver implementation for CP2105 only supports outputs */ 1556 priv->gpio_input = 0; 1557 1558 return 0; 1559 } 1560 1561 static int cp2104_gpioconf_init(struct usb_serial *serial) 1562 { 1563 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1564 struct cp210x_single_port_config config; 1565 u8 iface_config; 1566 u8 gpio_latch; 1567 int result; 1568 u8 i; 1569 1570 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1571 CP210X_GET_PORTCONFIG, &config, 1572 sizeof(config)); 1573 if (result < 0) 1574 return result; 1575 1576 priv->gc.ngpio = 4; 1577 1578 iface_config = config.device_cfg; 1579 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1580 CP210X_GPIO_MODE_MASK) >> 1581 CP210X_GPIO_MODE_OFFSET); 1582 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1583 CP210X_GPIO_MODE_MASK) >> 1584 CP210X_GPIO_MODE_OFFSET); 1585 1586 /* mark all pins which are not in GPIO mode */ 1587 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1588 priv->gpio_altfunc |= BIT(0); 1589 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1590 priv->gpio_altfunc |= BIT(1); 1591 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1592 priv->gpio_altfunc |= BIT(2); 1593 1594 /* 1595 * Like CP2102N, CP2104 has also no strict input and output pin 1596 * modes. 1597 * Do the same input mode emulation as CP2102N. 1598 */ 1599 for (i = 0; i < priv->gc.ngpio; ++i) { 1600 /* 1601 * Set direction to "input" iff pin is open-drain and reset 1602 * value is 1. 1603 */ 1604 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1605 priv->gpio_input |= BIT(i); 1606 } 1607 1608 return 0; 1609 } 1610 1611 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1612 { 1613 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1614 const u16 config_size = 0x02a6; 1615 u8 gpio_rst_latch; 1616 u8 config_version; 1617 u8 gpio_pushpull; 1618 u8 *config_buf; 1619 u8 gpio_latch; 1620 u8 gpio_ctrl; 1621 int result; 1622 u8 i; 1623 1624 /* 1625 * Retrieve device configuration from the device. 1626 * The array received contains all customization settings done at the 1627 * factory/manufacturer. Format of the array is documented at the 1628 * time of writing at: 1629 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1630 */ 1631 config_buf = kmalloc(config_size, GFP_KERNEL); 1632 if (!config_buf) 1633 return -ENOMEM; 1634 1635 result = cp210x_read_vendor_block(serial, 1636 REQTYPE_DEVICE_TO_HOST, 1637 CP210X_READ_2NCONFIG, 1638 config_buf, 1639 config_size); 1640 if (result < 0) { 1641 kfree(config_buf); 1642 return result; 1643 } 1644 1645 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1646 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1647 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1648 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1649 1650 kfree(config_buf); 1651 1652 /* Make sure this is a config format we understand. */ 1653 if (config_version != 0x01) 1654 return -ENOTSUPP; 1655 1656 priv->gc.ngpio = 4; 1657 1658 /* 1659 * Get default pin states after reset. Needed so we can determine 1660 * the direction of an open-drain pin. 1661 */ 1662 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1663 1664 /* 0 indicates open-drain mode, 1 is push-pull */ 1665 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1666 1667 /* 0 indicates GPIO mode, 1 is alternate function */ 1668 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1669 1670 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1671 /* 1672 * For the QFN28 package, GPIO4-6 are controlled by 1673 * the low three bits of the mode/latch fields. 1674 * Contrary to the document linked above, the bits for 1675 * the SUSPEND pins are elsewhere. No alternate 1676 * function is available for these pins. 1677 */ 1678 priv->gc.ngpio = 7; 1679 gpio_latch |= (gpio_rst_latch & 7) << 4; 1680 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1681 } 1682 1683 /* 1684 * The CP2102N does not strictly has input and output pin modes, 1685 * it only knows open-drain and push-pull modes which is set at 1686 * factory. An open-drain pin can function both as an 1687 * input or an output. We emulate input mode for open-drain pins 1688 * by making sure they are not driven low, and we do not allow 1689 * push-pull pins to be set as an input. 1690 */ 1691 for (i = 0; i < priv->gc.ngpio; ++i) { 1692 /* 1693 * Set direction to "input" iff pin is open-drain and reset 1694 * value is 1. 1695 */ 1696 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1697 priv->gpio_input |= BIT(i); 1698 } 1699 1700 return 0; 1701 } 1702 1703 static int cp210x_gpio_init(struct usb_serial *serial) 1704 { 1705 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1706 int result; 1707 1708 switch (priv->partnum) { 1709 case CP210X_PARTNUM_CP2104: 1710 result = cp2104_gpioconf_init(serial); 1711 break; 1712 case CP210X_PARTNUM_CP2105: 1713 result = cp2105_gpioconf_init(serial); 1714 break; 1715 case CP210X_PARTNUM_CP2102N_QFN28: 1716 case CP210X_PARTNUM_CP2102N_QFN24: 1717 case CP210X_PARTNUM_CP2102N_QFN20: 1718 result = cp2102n_gpioconf_init(serial); 1719 break; 1720 default: 1721 return 0; 1722 } 1723 1724 if (result < 0) 1725 return result; 1726 1727 priv->gc.label = "cp210x"; 1728 priv->gc.request = cp210x_gpio_request; 1729 priv->gc.get_direction = cp210x_gpio_direction_get; 1730 priv->gc.direction_input = cp210x_gpio_direction_input; 1731 priv->gc.direction_output = cp210x_gpio_direction_output; 1732 priv->gc.get = cp210x_gpio_get; 1733 priv->gc.set = cp210x_gpio_set; 1734 priv->gc.set_config = cp210x_gpio_set_config; 1735 priv->gc.owner = THIS_MODULE; 1736 priv->gc.parent = &serial->interface->dev; 1737 priv->gc.base = -1; 1738 priv->gc.can_sleep = true; 1739 1740 result = gpiochip_add_data(&priv->gc, serial); 1741 if (!result) 1742 priv->gpio_registered = true; 1743 1744 return result; 1745 } 1746 1747 static void cp210x_gpio_remove(struct usb_serial *serial) 1748 { 1749 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1750 1751 if (priv->gpio_registered) { 1752 gpiochip_remove(&priv->gc); 1753 priv->gpio_registered = false; 1754 } 1755 } 1756 1757 #else 1758 1759 static int cp210x_gpio_init(struct usb_serial *serial) 1760 { 1761 return 0; 1762 } 1763 1764 static void cp210x_gpio_remove(struct usb_serial *serial) 1765 { 1766 /* Nothing to do */ 1767 } 1768 1769 #endif 1770 1771 static int cp210x_port_probe(struct usb_serial_port *port) 1772 { 1773 struct usb_serial *serial = port->serial; 1774 struct cp210x_port_private *port_priv; 1775 int ret; 1776 1777 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1778 if (!port_priv) 1779 return -ENOMEM; 1780 1781 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1782 1783 usb_set_serial_port_data(port, port_priv); 1784 1785 ret = cp210x_detect_swapped_line_ctl(port); 1786 if (ret) { 1787 kfree(port_priv); 1788 return ret; 1789 } 1790 1791 return 0; 1792 } 1793 1794 static int cp210x_port_remove(struct usb_serial_port *port) 1795 { 1796 struct cp210x_port_private *port_priv; 1797 1798 port_priv = usb_get_serial_port_data(port); 1799 kfree(port_priv); 1800 1801 return 0; 1802 } 1803 1804 static void cp210x_init_max_speed(struct usb_serial *serial) 1805 { 1806 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1807 bool use_actual_rate = false; 1808 speed_t min = 300; 1809 speed_t max; 1810 1811 switch (priv->partnum) { 1812 case CP210X_PARTNUM_CP2101: 1813 max = 921600; 1814 break; 1815 case CP210X_PARTNUM_CP2102: 1816 case CP210X_PARTNUM_CP2103: 1817 max = 1000000; 1818 break; 1819 case CP210X_PARTNUM_CP2104: 1820 use_actual_rate = true; 1821 max = 2000000; 1822 break; 1823 case CP210X_PARTNUM_CP2108: 1824 max = 2000000; 1825 break; 1826 case CP210X_PARTNUM_CP2105: 1827 if (cp210x_interface_num(serial) == 0) { 1828 use_actual_rate = true; 1829 max = 2000000; /* ECI */ 1830 } else { 1831 min = 2400; 1832 max = 921600; /* SCI */ 1833 } 1834 break; 1835 case CP210X_PARTNUM_CP2102N_QFN28: 1836 case CP210X_PARTNUM_CP2102N_QFN24: 1837 case CP210X_PARTNUM_CP2102N_QFN20: 1838 use_actual_rate = true; 1839 max = 3000000; 1840 break; 1841 default: 1842 max = 2000000; 1843 break; 1844 } 1845 1846 priv->min_speed = min; 1847 priv->max_speed = max; 1848 priv->use_actual_rate = use_actual_rate; 1849 } 1850 1851 static int cp210x_attach(struct usb_serial *serial) 1852 { 1853 int result; 1854 struct cp210x_serial_private *priv; 1855 1856 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1857 if (!priv) 1858 return -ENOMEM; 1859 1860 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1861 CP210X_GET_PARTNUM, &priv->partnum, 1862 sizeof(priv->partnum)); 1863 if (result < 0) { 1864 dev_warn(&serial->interface->dev, 1865 "querying part number failed\n"); 1866 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1867 } 1868 1869 usb_set_serial_data(serial, priv); 1870 1871 cp210x_init_max_speed(serial); 1872 1873 result = cp210x_gpio_init(serial); 1874 if (result < 0) { 1875 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1876 result); 1877 } 1878 1879 return 0; 1880 } 1881 1882 static void cp210x_disconnect(struct usb_serial *serial) 1883 { 1884 cp210x_gpio_remove(serial); 1885 } 1886 1887 static void cp210x_release(struct usb_serial *serial) 1888 { 1889 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1890 1891 cp210x_gpio_remove(serial); 1892 1893 kfree(priv); 1894 } 1895 1896 module_usb_serial_driver(serial_drivers, id_table); 1897 1898 MODULE_DESCRIPTION(DRIVER_DESC); 1899 MODULE_LICENSE("GPL v2"); 1900