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, 0x8056) }, /* Lorenz Messtechnik devices */ 84 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 85 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 86 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 87 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 88 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 89 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 90 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 91 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 92 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 93 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 94 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 95 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 96 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 97 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 98 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 99 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 100 { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */ 101 { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */ 102 { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */ 103 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 104 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 105 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 106 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 107 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 108 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 109 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 110 { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */ 111 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 112 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 113 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 114 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 115 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 116 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 117 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 118 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 119 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 120 { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */ 121 { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */ 122 { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */ 123 { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */ 124 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 125 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 126 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 127 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 128 { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */ 129 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 130 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 131 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 132 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 133 { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */ 134 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 135 { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */ 136 { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */ 137 { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */ 138 { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */ 139 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 140 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 141 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 142 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 143 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 144 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 145 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 146 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 147 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 148 { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */ 149 { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */ 150 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 151 { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */ 152 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 153 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 154 { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */ 155 { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */ 156 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 157 { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */ 158 { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */ 159 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 160 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 161 { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */ 162 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 163 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 164 { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */ 165 { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */ 166 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 167 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 168 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 169 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 170 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 171 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 172 { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */ 173 { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */ 174 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 175 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 176 { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */ 177 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 178 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 179 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 180 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 181 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 182 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 183 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 184 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 185 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 186 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 187 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 188 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 189 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 190 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 191 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 192 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 193 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 194 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 195 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 196 { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */ 197 { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */ 198 { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */ 199 { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */ 200 { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */ 201 { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */ 202 { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */ 203 { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */ 204 { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */ 205 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 206 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 207 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 208 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 209 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 210 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 211 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 212 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 213 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 214 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 215 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 216 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 217 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 218 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 219 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 220 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 221 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 222 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 223 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 224 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 225 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 226 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 227 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 228 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 229 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 230 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 231 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 232 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 233 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 234 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 235 { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */ 236 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 237 { } /* Terminating Entry */ 238 }; 239 240 MODULE_DEVICE_TABLE(usb, id_table); 241 242 struct cp210x_serial_private { 243 #ifdef CONFIG_GPIOLIB 244 struct gpio_chip gc; 245 bool gpio_registered; 246 u8 gpio_pushpull; 247 u8 gpio_altfunc; 248 u8 gpio_input; 249 #endif 250 u8 partnum; 251 speed_t min_speed; 252 speed_t max_speed; 253 bool use_actual_rate; 254 }; 255 256 struct cp210x_port_private { 257 __u8 bInterfaceNumber; 258 bool has_swapped_line_ctl; 259 }; 260 261 static struct usb_serial_driver cp210x_device = { 262 .driver = { 263 .owner = THIS_MODULE, 264 .name = "cp210x", 265 }, 266 .id_table = id_table, 267 .num_ports = 1, 268 .bulk_in_size = 256, 269 .bulk_out_size = 256, 270 .open = cp210x_open, 271 .close = cp210x_close, 272 .break_ctl = cp210x_break_ctl, 273 .set_termios = cp210x_set_termios, 274 .tx_empty = cp210x_tx_empty, 275 .tiocmget = cp210x_tiocmget, 276 .tiocmset = cp210x_tiocmset, 277 .attach = cp210x_attach, 278 .disconnect = cp210x_disconnect, 279 .release = cp210x_release, 280 .port_probe = cp210x_port_probe, 281 .port_remove = cp210x_port_remove, 282 .dtr_rts = cp210x_dtr_rts 283 }; 284 285 static struct usb_serial_driver * const serial_drivers[] = { 286 &cp210x_device, NULL 287 }; 288 289 /* Config request types */ 290 #define REQTYPE_HOST_TO_INTERFACE 0x41 291 #define REQTYPE_INTERFACE_TO_HOST 0xc1 292 #define REQTYPE_HOST_TO_DEVICE 0x40 293 #define REQTYPE_DEVICE_TO_HOST 0xc0 294 295 /* Config request codes */ 296 #define CP210X_IFC_ENABLE 0x00 297 #define CP210X_SET_BAUDDIV 0x01 298 #define CP210X_GET_BAUDDIV 0x02 299 #define CP210X_SET_LINE_CTL 0x03 300 #define CP210X_GET_LINE_CTL 0x04 301 #define CP210X_SET_BREAK 0x05 302 #define CP210X_IMM_CHAR 0x06 303 #define CP210X_SET_MHS 0x07 304 #define CP210X_GET_MDMSTS 0x08 305 #define CP210X_SET_XON 0x09 306 #define CP210X_SET_XOFF 0x0A 307 #define CP210X_SET_EVENTMASK 0x0B 308 #define CP210X_GET_EVENTMASK 0x0C 309 #define CP210X_SET_CHAR 0x0D 310 #define CP210X_GET_CHARS 0x0E 311 #define CP210X_GET_PROPS 0x0F 312 #define CP210X_GET_COMM_STATUS 0x10 313 #define CP210X_RESET 0x11 314 #define CP210X_PURGE 0x12 315 #define CP210X_SET_FLOW 0x13 316 #define CP210X_GET_FLOW 0x14 317 #define CP210X_EMBED_EVENTS 0x15 318 #define CP210X_GET_EVENTSTATE 0x16 319 #define CP210X_SET_CHARS 0x19 320 #define CP210X_GET_BAUDRATE 0x1D 321 #define CP210X_SET_BAUDRATE 0x1E 322 #define CP210X_VENDOR_SPECIFIC 0xFF 323 324 /* CP210X_IFC_ENABLE */ 325 #define UART_ENABLE 0x0001 326 #define UART_DISABLE 0x0000 327 328 /* CP210X_(SET|GET)_BAUDDIV */ 329 #define BAUD_RATE_GEN_FREQ 0x384000 330 331 /* CP210X_(SET|GET)_LINE_CTL */ 332 #define BITS_DATA_MASK 0X0f00 333 #define BITS_DATA_5 0X0500 334 #define BITS_DATA_6 0X0600 335 #define BITS_DATA_7 0X0700 336 #define BITS_DATA_8 0X0800 337 #define BITS_DATA_9 0X0900 338 339 #define BITS_PARITY_MASK 0x00f0 340 #define BITS_PARITY_NONE 0x0000 341 #define BITS_PARITY_ODD 0x0010 342 #define BITS_PARITY_EVEN 0x0020 343 #define BITS_PARITY_MARK 0x0030 344 #define BITS_PARITY_SPACE 0x0040 345 346 #define BITS_STOP_MASK 0x000f 347 #define BITS_STOP_1 0x0000 348 #define BITS_STOP_1_5 0x0001 349 #define BITS_STOP_2 0x0002 350 351 /* CP210X_SET_BREAK */ 352 #define BREAK_ON 0x0001 353 #define BREAK_OFF 0x0000 354 355 /* CP210X_(SET_MHS|GET_MDMSTS) */ 356 #define CONTROL_DTR 0x0001 357 #define CONTROL_RTS 0x0002 358 #define CONTROL_CTS 0x0010 359 #define CONTROL_DSR 0x0020 360 #define CONTROL_RING 0x0040 361 #define CONTROL_DCD 0x0080 362 #define CONTROL_WRITE_DTR 0x0100 363 #define CONTROL_WRITE_RTS 0x0200 364 365 /* CP210X_VENDOR_SPECIFIC values */ 366 #define CP210X_READ_2NCONFIG 0x000E 367 #define CP210X_READ_LATCH 0x00C2 368 #define CP210X_GET_PARTNUM 0x370B 369 #define CP210X_GET_PORTCONFIG 0x370C 370 #define CP210X_GET_DEVICEMODE 0x3711 371 #define CP210X_WRITE_LATCH 0x37E1 372 373 /* Part number definitions */ 374 #define CP210X_PARTNUM_CP2101 0x01 375 #define CP210X_PARTNUM_CP2102 0x02 376 #define CP210X_PARTNUM_CP2103 0x03 377 #define CP210X_PARTNUM_CP2104 0x04 378 #define CP210X_PARTNUM_CP2105 0x05 379 #define CP210X_PARTNUM_CP2108 0x08 380 #define CP210X_PARTNUM_CP2102N_QFN28 0x20 381 #define CP210X_PARTNUM_CP2102N_QFN24 0x21 382 #define CP210X_PARTNUM_CP2102N_QFN20 0x22 383 #define CP210X_PARTNUM_UNKNOWN 0xFF 384 385 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 386 struct cp210x_comm_status { 387 __le32 ulErrors; 388 __le32 ulHoldReasons; 389 __le32 ulAmountInInQueue; 390 __le32 ulAmountInOutQueue; 391 u8 bEofReceived; 392 u8 bWaitForImmediate; 393 u8 bReserved; 394 } __packed; 395 396 /* 397 * CP210X_PURGE - 16 bits passed in wValue of USB request. 398 * SiLabs app note AN571 gives a strange description of the 4 bits: 399 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 400 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 401 */ 402 #define PURGE_ALL 0x000f 403 404 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */ 405 struct cp210x_flow_ctl { 406 __le32 ulControlHandshake; 407 __le32 ulFlowReplace; 408 __le32 ulXonLimit; 409 __le32 ulXoffLimit; 410 } __packed; 411 412 /* cp210x_flow_ctl::ulControlHandshake */ 413 #define CP210X_SERIAL_DTR_MASK GENMASK(1, 0) 414 #define CP210X_SERIAL_DTR_SHIFT(_mode) (_mode) 415 #define CP210X_SERIAL_CTS_HANDSHAKE BIT(3) 416 #define CP210X_SERIAL_DSR_HANDSHAKE BIT(4) 417 #define CP210X_SERIAL_DCD_HANDSHAKE BIT(5) 418 #define CP210X_SERIAL_DSR_SENSITIVITY BIT(6) 419 420 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */ 421 #define CP210X_SERIAL_DTR_INACTIVE 0 422 #define CP210X_SERIAL_DTR_ACTIVE 1 423 #define CP210X_SERIAL_DTR_FLOW_CTL 2 424 425 /* cp210x_flow_ctl::ulFlowReplace */ 426 #define CP210X_SERIAL_AUTO_TRANSMIT BIT(0) 427 #define CP210X_SERIAL_AUTO_RECEIVE BIT(1) 428 #define CP210X_SERIAL_ERROR_CHAR BIT(2) 429 #define CP210X_SERIAL_NULL_STRIPPING BIT(3) 430 #define CP210X_SERIAL_BREAK_CHAR BIT(4) 431 #define CP210X_SERIAL_RTS_MASK GENMASK(7, 6) 432 #define CP210X_SERIAL_RTS_SHIFT(_mode) (_mode << 6) 433 #define CP210X_SERIAL_XOFF_CONTINUE BIT(31) 434 435 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */ 436 #define CP210X_SERIAL_RTS_INACTIVE 0 437 #define CP210X_SERIAL_RTS_ACTIVE 1 438 #define CP210X_SERIAL_RTS_FLOW_CTL 2 439 440 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */ 441 struct cp210x_pin_mode { 442 u8 eci; 443 u8 sci; 444 } __packed; 445 446 #define CP210X_PIN_MODE_MODEM 0 447 #define CP210X_PIN_MODE_GPIO BIT(0) 448 449 /* 450 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes 451 * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes. 452 */ 453 struct cp210x_dual_port_config { 454 __le16 gpio_mode; 455 u8 __pad0[2]; 456 __le16 reset_state; 457 u8 __pad1[4]; 458 __le16 suspend_state; 459 u8 sci_cfg; 460 u8 eci_cfg; 461 u8 device_cfg; 462 } __packed; 463 464 /* 465 * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes 466 * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes. 467 */ 468 struct cp210x_single_port_config { 469 __le16 gpio_mode; 470 u8 __pad0[2]; 471 __le16 reset_state; 472 u8 __pad1[4]; 473 __le16 suspend_state; 474 u8 device_cfg; 475 } __packed; 476 477 /* GPIO modes */ 478 #define CP210X_SCI_GPIO_MODE_OFFSET 9 479 #define CP210X_SCI_GPIO_MODE_MASK GENMASK(11, 9) 480 481 #define CP210X_ECI_GPIO_MODE_OFFSET 2 482 #define CP210X_ECI_GPIO_MODE_MASK GENMASK(3, 2) 483 484 #define CP210X_GPIO_MODE_OFFSET 8 485 #define CP210X_GPIO_MODE_MASK GENMASK(11, 8) 486 487 /* CP2105 port configuration values */ 488 #define CP2105_GPIO0_TXLED_MODE BIT(0) 489 #define CP2105_GPIO1_RXLED_MODE BIT(1) 490 #define CP2105_GPIO1_RS485_MODE BIT(2) 491 492 /* CP2104 port configuration values */ 493 #define CP2104_GPIO0_TXLED_MODE BIT(0) 494 #define CP2104_GPIO1_RXLED_MODE BIT(1) 495 #define CP2104_GPIO2_RS485_MODE BIT(2) 496 497 /* CP2102N configuration array indices */ 498 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2 499 #define CP210X_2NCONFIG_GPIO_MODE_IDX 581 500 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587 501 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600 502 503 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */ 504 struct cp210x_gpio_write { 505 u8 mask; 506 u8 state; 507 } __packed; 508 509 /* 510 * Helper to get interface number when we only have struct usb_serial. 511 */ 512 static u8 cp210x_interface_num(struct usb_serial *serial) 513 { 514 struct usb_host_interface *cur_altsetting; 515 516 cur_altsetting = serial->interface->cur_altsetting; 517 518 return cur_altsetting->desc.bInterfaceNumber; 519 } 520 521 /* 522 * Reads a variable-sized block of CP210X_ registers, identified by req. 523 * Returns data into buf in native USB byte order. 524 */ 525 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req, 526 void *buf, int bufsize) 527 { 528 struct usb_serial *serial = port->serial; 529 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 530 void *dmabuf; 531 int result; 532 533 dmabuf = kmalloc(bufsize, GFP_KERNEL); 534 if (!dmabuf) { 535 /* 536 * FIXME Some callers don't bother to check for error, 537 * at least give them consistent junk until they are fixed 538 */ 539 memset(buf, 0, bufsize); 540 return -ENOMEM; 541 } 542 543 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 544 req, REQTYPE_INTERFACE_TO_HOST, 0, 545 port_priv->bInterfaceNumber, dmabuf, bufsize, 546 USB_CTRL_SET_TIMEOUT); 547 if (result == bufsize) { 548 memcpy(buf, dmabuf, bufsize); 549 result = 0; 550 } else { 551 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n", 552 req, bufsize, result); 553 if (result >= 0) 554 result = -EIO; 555 556 /* 557 * FIXME Some callers don't bother to check for error, 558 * at least give them consistent junk until they are fixed 559 */ 560 memset(buf, 0, bufsize); 561 } 562 563 kfree(dmabuf); 564 565 return result; 566 } 567 568 /* 569 * Reads any 32-bit CP210X_ register identified by req. 570 */ 571 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val) 572 { 573 __le32 le32_val; 574 int err; 575 576 err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val)); 577 if (err) { 578 /* 579 * FIXME Some callers don't bother to check for error, 580 * at least give them consistent junk until they are fixed 581 */ 582 *val = 0; 583 return err; 584 } 585 586 *val = le32_to_cpu(le32_val); 587 588 return 0; 589 } 590 591 /* 592 * Reads any 16-bit CP210X_ register identified by req. 593 */ 594 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val) 595 { 596 __le16 le16_val; 597 int err; 598 599 err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val)); 600 if (err) 601 return err; 602 603 *val = le16_to_cpu(le16_val); 604 605 return 0; 606 } 607 608 /* 609 * Reads any 8-bit CP210X_ register identified by req. 610 */ 611 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val) 612 { 613 return cp210x_read_reg_block(port, req, val, sizeof(*val)); 614 } 615 616 /* 617 * Reads a variable-sized vendor block of CP210X_ registers, identified by val. 618 * Returns data into buf in native USB byte order. 619 */ 620 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val, 621 void *buf, int bufsize) 622 { 623 void *dmabuf; 624 int result; 625 626 dmabuf = kmalloc(bufsize, GFP_KERNEL); 627 if (!dmabuf) 628 return -ENOMEM; 629 630 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 631 CP210X_VENDOR_SPECIFIC, type, val, 632 cp210x_interface_num(serial), dmabuf, bufsize, 633 USB_CTRL_GET_TIMEOUT); 634 if (result == bufsize) { 635 memcpy(buf, dmabuf, bufsize); 636 result = 0; 637 } else { 638 dev_err(&serial->interface->dev, 639 "failed to get vendor val 0x%04x size %d: %d\n", val, 640 bufsize, result); 641 if (result >= 0) 642 result = -EIO; 643 } 644 645 kfree(dmabuf); 646 647 return result; 648 } 649 650 /* 651 * Writes any 16-bit CP210X_ register (req) whose value is passed 652 * entirely in the wValue field of the USB request. 653 */ 654 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val) 655 { 656 struct usb_serial *serial = port->serial; 657 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 658 int result; 659 660 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 661 req, REQTYPE_HOST_TO_INTERFACE, val, 662 port_priv->bInterfaceNumber, NULL, 0, 663 USB_CTRL_SET_TIMEOUT); 664 if (result < 0) { 665 dev_err(&port->dev, "failed set request 0x%x status: %d\n", 666 req, result); 667 } 668 669 return result; 670 } 671 672 /* 673 * Writes a variable-sized block of CP210X_ registers, identified by req. 674 * Data in buf must be in native USB byte order. 675 */ 676 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req, 677 void *buf, int bufsize) 678 { 679 struct usb_serial *serial = port->serial; 680 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 681 void *dmabuf; 682 int result; 683 684 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 685 if (!dmabuf) 686 return -ENOMEM; 687 688 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 689 req, REQTYPE_HOST_TO_INTERFACE, 0, 690 port_priv->bInterfaceNumber, dmabuf, bufsize, 691 USB_CTRL_SET_TIMEOUT); 692 693 kfree(dmabuf); 694 695 if (result == bufsize) { 696 result = 0; 697 } else { 698 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n", 699 req, bufsize, result); 700 if (result >= 0) 701 result = -EIO; 702 } 703 704 return result; 705 } 706 707 /* 708 * Writes any 32-bit CP210X_ register identified by req. 709 */ 710 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val) 711 { 712 __le32 le32_val; 713 714 le32_val = cpu_to_le32(val); 715 716 return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val)); 717 } 718 719 #ifdef CONFIG_GPIOLIB 720 /* 721 * Writes a variable-sized vendor block of CP210X_ registers, identified by val. 722 * Data in buf must be in native USB byte order. 723 */ 724 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type, 725 u16 val, void *buf, int bufsize) 726 { 727 void *dmabuf; 728 int result; 729 730 dmabuf = kmemdup(buf, bufsize, GFP_KERNEL); 731 if (!dmabuf) 732 return -ENOMEM; 733 734 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 735 CP210X_VENDOR_SPECIFIC, type, val, 736 cp210x_interface_num(serial), dmabuf, bufsize, 737 USB_CTRL_SET_TIMEOUT); 738 739 kfree(dmabuf); 740 741 if (result == bufsize) { 742 result = 0; 743 } else { 744 dev_err(&serial->interface->dev, 745 "failed to set vendor val 0x%04x size %d: %d\n", val, 746 bufsize, result); 747 if (result >= 0) 748 result = -EIO; 749 } 750 751 return result; 752 } 753 #endif 754 755 /* 756 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 757 * Write a known good value 0x800, read it back. 758 * If it comes back swapped the bug is detected. 759 * Preserve the original register value. 760 */ 761 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 762 { 763 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 764 u16 line_ctl_save; 765 u16 line_ctl_test; 766 int err; 767 768 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save); 769 if (err) 770 return err; 771 772 err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800); 773 if (err) 774 return err; 775 776 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test); 777 if (err) 778 return err; 779 780 if (line_ctl_test == 8) { 781 port_priv->has_swapped_line_ctl = true; 782 line_ctl_save = swab16(line_ctl_save); 783 } 784 785 return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save); 786 } 787 788 /* 789 * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL) 790 * to workaround cp2108 bug and get correct value. 791 */ 792 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl) 793 { 794 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 795 int err; 796 797 err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl); 798 if (err) 799 return err; 800 801 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 802 if (port_priv->has_swapped_line_ctl) 803 *ctl = swab16(*ctl); 804 805 return 0; 806 } 807 808 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 809 { 810 int result; 811 812 result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE); 813 if (result) { 814 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 815 return result; 816 } 817 818 /* Configure the termios structure */ 819 cp210x_get_termios(tty, port); 820 821 /* The baud rate must be initialised on cp2104 */ 822 if (tty) 823 cp210x_change_speed(tty, port, NULL); 824 825 return usb_serial_generic_open(tty, port); 826 } 827 828 static void cp210x_close(struct usb_serial_port *port) 829 { 830 usb_serial_generic_close(port); 831 832 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 833 cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL); 834 835 cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE); 836 } 837 838 /* 839 * Read how many bytes are waiting in the TX queue. 840 */ 841 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 842 u32 *count) 843 { 844 struct usb_serial *serial = port->serial; 845 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 846 struct cp210x_comm_status *sts; 847 int result; 848 849 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 850 if (!sts) 851 return -ENOMEM; 852 853 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 854 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 855 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 856 USB_CTRL_GET_TIMEOUT); 857 if (result == sizeof(*sts)) { 858 *count = le32_to_cpu(sts->ulAmountInOutQueue); 859 result = 0; 860 } else { 861 dev_err(&port->dev, "failed to get comm status: %d\n", result); 862 if (result >= 0) 863 result = -EIO; 864 } 865 866 kfree(sts); 867 868 return result; 869 } 870 871 static bool cp210x_tx_empty(struct usb_serial_port *port) 872 { 873 int err; 874 u32 count; 875 876 err = cp210x_get_tx_queue_byte_count(port, &count); 877 if (err) 878 return true; 879 880 return !count; 881 } 882 883 /* 884 * cp210x_get_termios 885 * Reads the baud rate, data bits, parity, stop bits and flow control mode 886 * from the device, corrects any unsupported values, and configures the 887 * termios structure to reflect the state of the device 888 */ 889 static void cp210x_get_termios(struct tty_struct *tty, 890 struct usb_serial_port *port) 891 { 892 unsigned int baud; 893 894 if (tty) { 895 cp210x_get_termios_port(tty->driver_data, 896 &tty->termios.c_cflag, &baud); 897 tty_encode_baud_rate(tty, baud, baud); 898 } else { 899 tcflag_t cflag; 900 cflag = 0; 901 cp210x_get_termios_port(port, &cflag, &baud); 902 } 903 } 904 905 /* 906 * cp210x_get_termios_port 907 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 908 */ 909 static void cp210x_get_termios_port(struct usb_serial_port *port, 910 tcflag_t *cflagp, unsigned int *baudp) 911 { 912 struct device *dev = &port->dev; 913 tcflag_t cflag; 914 struct cp210x_flow_ctl flow_ctl; 915 u32 baud; 916 u16 bits; 917 u32 ctl_hs; 918 919 cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud); 920 921 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 922 *baudp = baud; 923 924 cflag = *cflagp; 925 926 cp210x_get_line_ctl(port, &bits); 927 cflag &= ~CSIZE; 928 switch (bits & BITS_DATA_MASK) { 929 case BITS_DATA_5: 930 dev_dbg(dev, "%s - data bits = 5\n", __func__); 931 cflag |= CS5; 932 break; 933 case BITS_DATA_6: 934 dev_dbg(dev, "%s - data bits = 6\n", __func__); 935 cflag |= CS6; 936 break; 937 case BITS_DATA_7: 938 dev_dbg(dev, "%s - data bits = 7\n", __func__); 939 cflag |= CS7; 940 break; 941 case BITS_DATA_8: 942 dev_dbg(dev, "%s - data bits = 8\n", __func__); 943 cflag |= CS8; 944 break; 945 case BITS_DATA_9: 946 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 947 cflag |= CS8; 948 bits &= ~BITS_DATA_MASK; 949 bits |= BITS_DATA_8; 950 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 951 break; 952 default: 953 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 954 cflag |= CS8; 955 bits &= ~BITS_DATA_MASK; 956 bits |= BITS_DATA_8; 957 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 958 break; 959 } 960 961 switch (bits & BITS_PARITY_MASK) { 962 case BITS_PARITY_NONE: 963 dev_dbg(dev, "%s - parity = NONE\n", __func__); 964 cflag &= ~PARENB; 965 break; 966 case BITS_PARITY_ODD: 967 dev_dbg(dev, "%s - parity = ODD\n", __func__); 968 cflag |= (PARENB|PARODD); 969 break; 970 case BITS_PARITY_EVEN: 971 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 972 cflag &= ~PARODD; 973 cflag |= PARENB; 974 break; 975 case BITS_PARITY_MARK: 976 dev_dbg(dev, "%s - parity = MARK\n", __func__); 977 cflag |= (PARENB|PARODD|CMSPAR); 978 break; 979 case BITS_PARITY_SPACE: 980 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 981 cflag &= ~PARODD; 982 cflag |= (PARENB|CMSPAR); 983 break; 984 default: 985 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 986 cflag &= ~PARENB; 987 bits &= ~BITS_PARITY_MASK; 988 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 989 break; 990 } 991 992 cflag &= ~CSTOPB; 993 switch (bits & BITS_STOP_MASK) { 994 case BITS_STOP_1: 995 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 996 break; 997 case BITS_STOP_1_5: 998 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 999 bits &= ~BITS_STOP_MASK; 1000 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1001 break; 1002 case BITS_STOP_2: 1003 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1004 cflag |= CSTOPB; 1005 break; 1006 default: 1007 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 1008 bits &= ~BITS_STOP_MASK; 1009 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits); 1010 break; 1011 } 1012 1013 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1014 sizeof(flow_ctl)); 1015 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1016 if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) { 1017 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1018 cflag |= CRTSCTS; 1019 } else { 1020 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1021 cflag &= ~CRTSCTS; 1022 } 1023 1024 *cflagp = cflag; 1025 } 1026 1027 struct cp210x_rate { 1028 speed_t rate; 1029 speed_t high; 1030 }; 1031 1032 static const struct cp210x_rate cp210x_an205_table1[] = { 1033 { 300, 300 }, 1034 { 600, 600 }, 1035 { 1200, 1200 }, 1036 { 1800, 1800 }, 1037 { 2400, 2400 }, 1038 { 4000, 4000 }, 1039 { 4800, 4803 }, 1040 { 7200, 7207 }, 1041 { 9600, 9612 }, 1042 { 14400, 14428 }, 1043 { 16000, 16062 }, 1044 { 19200, 19250 }, 1045 { 28800, 28912 }, 1046 { 38400, 38601 }, 1047 { 51200, 51558 }, 1048 { 56000, 56280 }, 1049 { 57600, 58053 }, 1050 { 64000, 64111 }, 1051 { 76800, 77608 }, 1052 { 115200, 117028 }, 1053 { 128000, 129347 }, 1054 { 153600, 156868 }, 1055 { 230400, 237832 }, 1056 { 250000, 254234 }, 1057 { 256000, 273066 }, 1058 { 460800, 491520 }, 1059 { 500000, 567138 }, 1060 { 576000, 670254 }, 1061 { 921600, UINT_MAX } 1062 }; 1063 1064 /* 1065 * Quantises the baud rate as per AN205 Table 1 1066 */ 1067 static speed_t cp210x_get_an205_rate(speed_t baud) 1068 { 1069 int i; 1070 1071 for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) { 1072 if (baud <= cp210x_an205_table1[i].high) 1073 break; 1074 } 1075 1076 return cp210x_an205_table1[i].rate; 1077 } 1078 1079 static speed_t cp210x_get_actual_rate(speed_t baud) 1080 { 1081 unsigned int prescale = 1; 1082 unsigned int div; 1083 1084 if (baud <= 365) 1085 prescale = 4; 1086 1087 div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud); 1088 baud = 48000000 / (2 * prescale * div); 1089 1090 return baud; 1091 } 1092 1093 /* 1094 * CP2101 supports the following baud rates: 1095 * 1096 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 1097 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 1098 * 1099 * CP2102 and CP2103 support the following additional rates: 1100 * 1101 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 1102 * 576000 1103 * 1104 * The device will map a requested rate to a supported one, but the result 1105 * of requests for rates greater than 1053257 is undefined (see AN205). 1106 * 1107 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 1108 * respectively, with an error less than 1%. The actual rates are determined 1109 * by 1110 * 1111 * div = round(freq / (2 x prescale x request)) 1112 * actual = freq / (2 x prescale x div) 1113 * 1114 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 1115 * or 1 otherwise. 1116 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 1117 * otherwise. 1118 */ 1119 static void cp210x_change_speed(struct tty_struct *tty, 1120 struct usb_serial_port *port, struct ktermios *old_termios) 1121 { 1122 struct usb_serial *serial = port->serial; 1123 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1124 u32 baud; 1125 1126 /* 1127 * This maps the requested rate to the actual rate, a valid rate on 1128 * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed]. 1129 * 1130 * NOTE: B0 is not implemented. 1131 */ 1132 baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed); 1133 1134 if (priv->use_actual_rate) 1135 baud = cp210x_get_actual_rate(baud); 1136 else if (baud < 1000000) 1137 baud = cp210x_get_an205_rate(baud); 1138 1139 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 1140 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) { 1141 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 1142 if (old_termios) 1143 baud = old_termios->c_ospeed; 1144 else 1145 baud = 9600; 1146 } 1147 1148 tty_encode_baud_rate(tty, baud, baud); 1149 } 1150 1151 static void cp210x_set_termios(struct tty_struct *tty, 1152 struct usb_serial_port *port, struct ktermios *old_termios) 1153 { 1154 struct device *dev = &port->dev; 1155 unsigned int cflag, old_cflag; 1156 u16 bits; 1157 1158 cflag = tty->termios.c_cflag; 1159 old_cflag = old_termios->c_cflag; 1160 1161 if (tty->termios.c_ospeed != old_termios->c_ospeed) 1162 cp210x_change_speed(tty, port, old_termios); 1163 1164 /* If the number of data bits is to be updated */ 1165 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 1166 cp210x_get_line_ctl(port, &bits); 1167 bits &= ~BITS_DATA_MASK; 1168 switch (cflag & CSIZE) { 1169 case CS5: 1170 bits |= BITS_DATA_5; 1171 dev_dbg(dev, "%s - data bits = 5\n", __func__); 1172 break; 1173 case CS6: 1174 bits |= BITS_DATA_6; 1175 dev_dbg(dev, "%s - data bits = 6\n", __func__); 1176 break; 1177 case CS7: 1178 bits |= BITS_DATA_7; 1179 dev_dbg(dev, "%s - data bits = 7\n", __func__); 1180 break; 1181 case CS8: 1182 default: 1183 bits |= BITS_DATA_8; 1184 dev_dbg(dev, "%s - data bits = 8\n", __func__); 1185 break; 1186 } 1187 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1188 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 1189 } 1190 1191 if ((cflag & (PARENB|PARODD|CMSPAR)) != 1192 (old_cflag & (PARENB|PARODD|CMSPAR))) { 1193 cp210x_get_line_ctl(port, &bits); 1194 bits &= ~BITS_PARITY_MASK; 1195 if (cflag & PARENB) { 1196 if (cflag & CMSPAR) { 1197 if (cflag & PARODD) { 1198 bits |= BITS_PARITY_MARK; 1199 dev_dbg(dev, "%s - parity = MARK\n", __func__); 1200 } else { 1201 bits |= BITS_PARITY_SPACE; 1202 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 1203 } 1204 } else { 1205 if (cflag & PARODD) { 1206 bits |= BITS_PARITY_ODD; 1207 dev_dbg(dev, "%s - parity = ODD\n", __func__); 1208 } else { 1209 bits |= BITS_PARITY_EVEN; 1210 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 1211 } 1212 } 1213 } 1214 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1215 dev_dbg(dev, "Parity mode not supported by device\n"); 1216 } 1217 1218 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 1219 cp210x_get_line_ctl(port, &bits); 1220 bits &= ~BITS_STOP_MASK; 1221 if (cflag & CSTOPB) { 1222 bits |= BITS_STOP_2; 1223 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 1224 } else { 1225 bits |= BITS_STOP_1; 1226 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 1227 } 1228 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits)) 1229 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 1230 } 1231 1232 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 1233 struct cp210x_flow_ctl flow_ctl; 1234 u32 ctl_hs; 1235 u32 flow_repl; 1236 1237 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl, 1238 sizeof(flow_ctl)); 1239 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake); 1240 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace); 1241 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1242 __func__, ctl_hs, flow_repl); 1243 1244 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE; 1245 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE; 1246 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY; 1247 ctl_hs &= ~CP210X_SERIAL_DTR_MASK; 1248 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE); 1249 if (cflag & CRTSCTS) { 1250 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE; 1251 1252 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1253 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1254 CP210X_SERIAL_RTS_FLOW_CTL); 1255 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 1256 } else { 1257 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE; 1258 1259 flow_repl &= ~CP210X_SERIAL_RTS_MASK; 1260 flow_repl |= CP210X_SERIAL_RTS_SHIFT( 1261 CP210X_SERIAL_RTS_ACTIVE); 1262 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 1263 } 1264 1265 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n", 1266 __func__, ctl_hs, flow_repl); 1267 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs); 1268 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl); 1269 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl, 1270 sizeof(flow_ctl)); 1271 } 1272 1273 } 1274 1275 static int cp210x_tiocmset(struct tty_struct *tty, 1276 unsigned int set, unsigned int clear) 1277 { 1278 struct usb_serial_port *port = tty->driver_data; 1279 return cp210x_tiocmset_port(port, set, clear); 1280 } 1281 1282 static int cp210x_tiocmset_port(struct usb_serial_port *port, 1283 unsigned int set, unsigned int clear) 1284 { 1285 u16 control = 0; 1286 1287 if (set & TIOCM_RTS) { 1288 control |= CONTROL_RTS; 1289 control |= CONTROL_WRITE_RTS; 1290 } 1291 if (set & TIOCM_DTR) { 1292 control |= CONTROL_DTR; 1293 control |= CONTROL_WRITE_DTR; 1294 } 1295 if (clear & TIOCM_RTS) { 1296 control &= ~CONTROL_RTS; 1297 control |= CONTROL_WRITE_RTS; 1298 } 1299 if (clear & TIOCM_DTR) { 1300 control &= ~CONTROL_DTR; 1301 control |= CONTROL_WRITE_DTR; 1302 } 1303 1304 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 1305 1306 return cp210x_write_u16_reg(port, CP210X_SET_MHS, control); 1307 } 1308 1309 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 1310 { 1311 if (on) 1312 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 1313 else 1314 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 1315 } 1316 1317 static int cp210x_tiocmget(struct tty_struct *tty) 1318 { 1319 struct usb_serial_port *port = tty->driver_data; 1320 u8 control; 1321 int result; 1322 1323 result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control); 1324 if (result) 1325 return result; 1326 1327 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 1328 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 1329 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 1330 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 1331 |((control & CONTROL_RING)? TIOCM_RI : 0) 1332 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 1333 1334 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 1335 1336 return result; 1337 } 1338 1339 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 1340 { 1341 struct usb_serial_port *port = tty->driver_data; 1342 u16 state; 1343 1344 if (break_state == 0) 1345 state = BREAK_OFF; 1346 else 1347 state = BREAK_ON; 1348 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 1349 state == BREAK_OFF ? "off" : "on"); 1350 cp210x_write_u16_reg(port, CP210X_SET_BREAK, state); 1351 } 1352 1353 #ifdef CONFIG_GPIOLIB 1354 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset) 1355 { 1356 struct usb_serial *serial = gpiochip_get_data(gc); 1357 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1358 1359 if (priv->gpio_altfunc & BIT(offset)) 1360 return -ENODEV; 1361 1362 return 0; 1363 } 1364 1365 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio) 1366 { 1367 struct usb_serial *serial = gpiochip_get_data(gc); 1368 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1369 u8 req_type = REQTYPE_DEVICE_TO_HOST; 1370 int result; 1371 u8 buf; 1372 1373 if (priv->partnum == CP210X_PARTNUM_CP2105) 1374 req_type = REQTYPE_INTERFACE_TO_HOST; 1375 1376 result = usb_autopm_get_interface(serial->interface); 1377 if (result) 1378 return result; 1379 1380 result = cp210x_read_vendor_block(serial, req_type, 1381 CP210X_READ_LATCH, &buf, sizeof(buf)); 1382 usb_autopm_put_interface(serial->interface); 1383 if (result < 0) 1384 return result; 1385 1386 return !!(buf & BIT(gpio)); 1387 } 1388 1389 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value) 1390 { 1391 struct usb_serial *serial = gpiochip_get_data(gc); 1392 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1393 struct cp210x_gpio_write buf; 1394 int result; 1395 1396 if (value == 1) 1397 buf.state = BIT(gpio); 1398 else 1399 buf.state = 0; 1400 1401 buf.mask = BIT(gpio); 1402 1403 result = usb_autopm_get_interface(serial->interface); 1404 if (result) 1405 goto out; 1406 1407 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1408 result = cp210x_write_vendor_block(serial, 1409 REQTYPE_HOST_TO_INTERFACE, 1410 CP210X_WRITE_LATCH, &buf, 1411 sizeof(buf)); 1412 } else { 1413 u16 wIndex = buf.state << 8 | buf.mask; 1414 1415 result = usb_control_msg(serial->dev, 1416 usb_sndctrlpipe(serial->dev, 0), 1417 CP210X_VENDOR_SPECIFIC, 1418 REQTYPE_HOST_TO_DEVICE, 1419 CP210X_WRITE_LATCH, 1420 wIndex, 1421 NULL, 0, USB_CTRL_SET_TIMEOUT); 1422 } 1423 1424 usb_autopm_put_interface(serial->interface); 1425 out: 1426 if (result < 0) { 1427 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n", 1428 result); 1429 } 1430 } 1431 1432 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio) 1433 { 1434 struct usb_serial *serial = gpiochip_get_data(gc); 1435 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1436 1437 return priv->gpio_input & BIT(gpio); 1438 } 1439 1440 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio) 1441 { 1442 struct usb_serial *serial = gpiochip_get_data(gc); 1443 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1444 1445 if (priv->partnum == CP210X_PARTNUM_CP2105) { 1446 /* hardware does not support an input mode */ 1447 return -ENOTSUPP; 1448 } 1449 1450 /* push-pull pins cannot be changed to be inputs */ 1451 if (priv->gpio_pushpull & BIT(gpio)) 1452 return -EINVAL; 1453 1454 /* make sure to release pin if it is being driven low */ 1455 cp210x_gpio_set(gc, gpio, 1); 1456 1457 priv->gpio_input |= BIT(gpio); 1458 1459 return 0; 1460 } 1461 1462 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio, 1463 int value) 1464 { 1465 struct usb_serial *serial = gpiochip_get_data(gc); 1466 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1467 1468 priv->gpio_input &= ~BIT(gpio); 1469 cp210x_gpio_set(gc, gpio, value); 1470 1471 return 0; 1472 } 1473 1474 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio, 1475 unsigned long config) 1476 { 1477 struct usb_serial *serial = gpiochip_get_data(gc); 1478 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1479 enum pin_config_param param = pinconf_to_config_param(config); 1480 1481 /* Succeed only if in correct mode (this can't be set at runtime) */ 1482 if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) && 1483 (priv->gpio_pushpull & BIT(gpio))) 1484 return 0; 1485 1486 if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) && 1487 !(priv->gpio_pushpull & BIT(gpio))) 1488 return 0; 1489 1490 return -ENOTSUPP; 1491 } 1492 1493 /* 1494 * This function is for configuring GPIO using shared pins, where other signals 1495 * are made unavailable by configuring the use of GPIO. This is believed to be 1496 * only applicable to the cp2105 at this point, the other devices supported by 1497 * this driver that provide GPIO do so in a way that does not impact other 1498 * signals and are thus expected to have very different initialisation. 1499 */ 1500 static int cp2105_gpioconf_init(struct usb_serial *serial) 1501 { 1502 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1503 struct cp210x_pin_mode mode; 1504 struct cp210x_dual_port_config config; 1505 u8 intf_num = cp210x_interface_num(serial); 1506 u8 iface_config; 1507 int result; 1508 1509 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1510 CP210X_GET_DEVICEMODE, &mode, 1511 sizeof(mode)); 1512 if (result < 0) 1513 return result; 1514 1515 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1516 CP210X_GET_PORTCONFIG, &config, 1517 sizeof(config)); 1518 if (result < 0) 1519 return result; 1520 1521 /* 2 banks of GPIO - One for the pins taken from each serial port */ 1522 if (intf_num == 0) { 1523 if (mode.eci == CP210X_PIN_MODE_MODEM) { 1524 /* mark all GPIOs of this interface as reserved */ 1525 priv->gpio_altfunc = 0xff; 1526 return 0; 1527 } 1528 1529 iface_config = config.eci_cfg; 1530 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1531 CP210X_ECI_GPIO_MODE_MASK) >> 1532 CP210X_ECI_GPIO_MODE_OFFSET); 1533 priv->gc.ngpio = 2; 1534 } else if (intf_num == 1) { 1535 if (mode.sci == CP210X_PIN_MODE_MODEM) { 1536 /* mark all GPIOs of this interface as reserved */ 1537 priv->gpio_altfunc = 0xff; 1538 return 0; 1539 } 1540 1541 iface_config = config.sci_cfg; 1542 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1543 CP210X_SCI_GPIO_MODE_MASK) >> 1544 CP210X_SCI_GPIO_MODE_OFFSET); 1545 priv->gc.ngpio = 3; 1546 } else { 1547 return -ENODEV; 1548 } 1549 1550 /* mark all pins which are not in GPIO mode */ 1551 if (iface_config & CP2105_GPIO0_TXLED_MODE) /* GPIO 0 */ 1552 priv->gpio_altfunc |= BIT(0); 1553 if (iface_config & (CP2105_GPIO1_RXLED_MODE | /* GPIO 1 */ 1554 CP2105_GPIO1_RS485_MODE)) 1555 priv->gpio_altfunc |= BIT(1); 1556 1557 /* driver implementation for CP2105 only supports outputs */ 1558 priv->gpio_input = 0; 1559 1560 return 0; 1561 } 1562 1563 static int cp2104_gpioconf_init(struct usb_serial *serial) 1564 { 1565 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1566 struct cp210x_single_port_config config; 1567 u8 iface_config; 1568 u8 gpio_latch; 1569 int result; 1570 u8 i; 1571 1572 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1573 CP210X_GET_PORTCONFIG, &config, 1574 sizeof(config)); 1575 if (result < 0) 1576 return result; 1577 1578 priv->gc.ngpio = 4; 1579 1580 iface_config = config.device_cfg; 1581 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) & 1582 CP210X_GPIO_MODE_MASK) >> 1583 CP210X_GPIO_MODE_OFFSET); 1584 gpio_latch = (u8)((le16_to_cpu(config.reset_state) & 1585 CP210X_GPIO_MODE_MASK) >> 1586 CP210X_GPIO_MODE_OFFSET); 1587 1588 /* mark all pins which are not in GPIO mode */ 1589 if (iface_config & CP2104_GPIO0_TXLED_MODE) /* GPIO 0 */ 1590 priv->gpio_altfunc |= BIT(0); 1591 if (iface_config & CP2104_GPIO1_RXLED_MODE) /* GPIO 1 */ 1592 priv->gpio_altfunc |= BIT(1); 1593 if (iface_config & CP2104_GPIO2_RS485_MODE) /* GPIO 2 */ 1594 priv->gpio_altfunc |= BIT(2); 1595 1596 /* 1597 * Like CP2102N, CP2104 has also no strict input and output pin 1598 * modes. 1599 * Do the same input mode emulation as CP2102N. 1600 */ 1601 for (i = 0; i < priv->gc.ngpio; ++i) { 1602 /* 1603 * Set direction to "input" iff pin is open-drain and reset 1604 * value is 1. 1605 */ 1606 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1607 priv->gpio_input |= BIT(i); 1608 } 1609 1610 return 0; 1611 } 1612 1613 static int cp2102n_gpioconf_init(struct usb_serial *serial) 1614 { 1615 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1616 const u16 config_size = 0x02a6; 1617 u8 gpio_rst_latch; 1618 u8 config_version; 1619 u8 gpio_pushpull; 1620 u8 *config_buf; 1621 u8 gpio_latch; 1622 u8 gpio_ctrl; 1623 int result; 1624 u8 i; 1625 1626 /* 1627 * Retrieve device configuration from the device. 1628 * The array received contains all customization settings done at the 1629 * factory/manufacturer. Format of the array is documented at the 1630 * time of writing at: 1631 * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa 1632 */ 1633 config_buf = kmalloc(config_size, GFP_KERNEL); 1634 if (!config_buf) 1635 return -ENOMEM; 1636 1637 result = cp210x_read_vendor_block(serial, 1638 REQTYPE_DEVICE_TO_HOST, 1639 CP210X_READ_2NCONFIG, 1640 config_buf, 1641 config_size); 1642 if (result < 0) { 1643 kfree(config_buf); 1644 return result; 1645 } 1646 1647 config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX]; 1648 gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX]; 1649 gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX]; 1650 gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX]; 1651 1652 kfree(config_buf); 1653 1654 /* Make sure this is a config format we understand. */ 1655 if (config_version != 0x01) 1656 return -ENOTSUPP; 1657 1658 priv->gc.ngpio = 4; 1659 1660 /* 1661 * Get default pin states after reset. Needed so we can determine 1662 * the direction of an open-drain pin. 1663 */ 1664 gpio_latch = (gpio_rst_latch >> 3) & 0x0f; 1665 1666 /* 0 indicates open-drain mode, 1 is push-pull */ 1667 priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f; 1668 1669 /* 0 indicates GPIO mode, 1 is alternate function */ 1670 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f; 1671 1672 if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) { 1673 /* 1674 * For the QFN28 package, GPIO4-6 are controlled by 1675 * the low three bits of the mode/latch fields. 1676 * Contrary to the document linked above, the bits for 1677 * the SUSPEND pins are elsewhere. No alternate 1678 * function is available for these pins. 1679 */ 1680 priv->gc.ngpio = 7; 1681 gpio_latch |= (gpio_rst_latch & 7) << 4; 1682 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4; 1683 } 1684 1685 /* 1686 * The CP2102N does not strictly has input and output pin modes, 1687 * it only knows open-drain and push-pull modes which is set at 1688 * factory. An open-drain pin can function both as an 1689 * input or an output. We emulate input mode for open-drain pins 1690 * by making sure they are not driven low, and we do not allow 1691 * push-pull pins to be set as an input. 1692 */ 1693 for (i = 0; i < priv->gc.ngpio; ++i) { 1694 /* 1695 * Set direction to "input" iff pin is open-drain and reset 1696 * value is 1. 1697 */ 1698 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i))) 1699 priv->gpio_input |= BIT(i); 1700 } 1701 1702 return 0; 1703 } 1704 1705 static int cp210x_gpio_init(struct usb_serial *serial) 1706 { 1707 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1708 int result; 1709 1710 switch (priv->partnum) { 1711 case CP210X_PARTNUM_CP2104: 1712 result = cp2104_gpioconf_init(serial); 1713 break; 1714 case CP210X_PARTNUM_CP2105: 1715 result = cp2105_gpioconf_init(serial); 1716 break; 1717 case CP210X_PARTNUM_CP2102N_QFN28: 1718 case CP210X_PARTNUM_CP2102N_QFN24: 1719 case CP210X_PARTNUM_CP2102N_QFN20: 1720 result = cp2102n_gpioconf_init(serial); 1721 break; 1722 default: 1723 return 0; 1724 } 1725 1726 if (result < 0) 1727 return result; 1728 1729 priv->gc.label = "cp210x"; 1730 priv->gc.request = cp210x_gpio_request; 1731 priv->gc.get_direction = cp210x_gpio_direction_get; 1732 priv->gc.direction_input = cp210x_gpio_direction_input; 1733 priv->gc.direction_output = cp210x_gpio_direction_output; 1734 priv->gc.get = cp210x_gpio_get; 1735 priv->gc.set = cp210x_gpio_set; 1736 priv->gc.set_config = cp210x_gpio_set_config; 1737 priv->gc.owner = THIS_MODULE; 1738 priv->gc.parent = &serial->interface->dev; 1739 priv->gc.base = -1; 1740 priv->gc.can_sleep = true; 1741 1742 result = gpiochip_add_data(&priv->gc, serial); 1743 if (!result) 1744 priv->gpio_registered = true; 1745 1746 return result; 1747 } 1748 1749 static void cp210x_gpio_remove(struct usb_serial *serial) 1750 { 1751 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1752 1753 if (priv->gpio_registered) { 1754 gpiochip_remove(&priv->gc); 1755 priv->gpio_registered = false; 1756 } 1757 } 1758 1759 #else 1760 1761 static int cp210x_gpio_init(struct usb_serial *serial) 1762 { 1763 return 0; 1764 } 1765 1766 static void cp210x_gpio_remove(struct usb_serial *serial) 1767 { 1768 /* Nothing to do */ 1769 } 1770 1771 #endif 1772 1773 static int cp210x_port_probe(struct usb_serial_port *port) 1774 { 1775 struct usb_serial *serial = port->serial; 1776 struct cp210x_port_private *port_priv; 1777 int ret; 1778 1779 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1780 if (!port_priv) 1781 return -ENOMEM; 1782 1783 port_priv->bInterfaceNumber = cp210x_interface_num(serial); 1784 1785 usb_set_serial_port_data(port, port_priv); 1786 1787 ret = cp210x_detect_swapped_line_ctl(port); 1788 if (ret) { 1789 kfree(port_priv); 1790 return ret; 1791 } 1792 1793 return 0; 1794 } 1795 1796 static int cp210x_port_remove(struct usb_serial_port *port) 1797 { 1798 struct cp210x_port_private *port_priv; 1799 1800 port_priv = usb_get_serial_port_data(port); 1801 kfree(port_priv); 1802 1803 return 0; 1804 } 1805 1806 static void cp210x_init_max_speed(struct usb_serial *serial) 1807 { 1808 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1809 bool use_actual_rate = false; 1810 speed_t min = 300; 1811 speed_t max; 1812 1813 switch (priv->partnum) { 1814 case CP210X_PARTNUM_CP2101: 1815 max = 921600; 1816 break; 1817 case CP210X_PARTNUM_CP2102: 1818 case CP210X_PARTNUM_CP2103: 1819 max = 1000000; 1820 break; 1821 case CP210X_PARTNUM_CP2104: 1822 use_actual_rate = true; 1823 max = 2000000; 1824 break; 1825 case CP210X_PARTNUM_CP2108: 1826 max = 2000000; 1827 break; 1828 case CP210X_PARTNUM_CP2105: 1829 if (cp210x_interface_num(serial) == 0) { 1830 use_actual_rate = true; 1831 max = 2000000; /* ECI */ 1832 } else { 1833 min = 2400; 1834 max = 921600; /* SCI */ 1835 } 1836 break; 1837 case CP210X_PARTNUM_CP2102N_QFN28: 1838 case CP210X_PARTNUM_CP2102N_QFN24: 1839 case CP210X_PARTNUM_CP2102N_QFN20: 1840 use_actual_rate = true; 1841 max = 3000000; 1842 break; 1843 default: 1844 max = 2000000; 1845 break; 1846 } 1847 1848 priv->min_speed = min; 1849 priv->max_speed = max; 1850 priv->use_actual_rate = use_actual_rate; 1851 } 1852 1853 static int cp210x_attach(struct usb_serial *serial) 1854 { 1855 int result; 1856 struct cp210x_serial_private *priv; 1857 1858 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1859 if (!priv) 1860 return -ENOMEM; 1861 1862 result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, 1863 CP210X_GET_PARTNUM, &priv->partnum, 1864 sizeof(priv->partnum)); 1865 if (result < 0) { 1866 dev_warn(&serial->interface->dev, 1867 "querying part number failed\n"); 1868 priv->partnum = CP210X_PARTNUM_UNKNOWN; 1869 } 1870 1871 usb_set_serial_data(serial, priv); 1872 1873 cp210x_init_max_speed(serial); 1874 1875 result = cp210x_gpio_init(serial); 1876 if (result < 0) { 1877 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n", 1878 result); 1879 } 1880 1881 return 0; 1882 } 1883 1884 static void cp210x_disconnect(struct usb_serial *serial) 1885 { 1886 cp210x_gpio_remove(serial); 1887 } 1888 1889 static void cp210x_release(struct usb_serial *serial) 1890 { 1891 struct cp210x_serial_private *priv = usb_get_serial_data(serial); 1892 1893 cp210x_gpio_remove(serial); 1894 1895 kfree(priv); 1896 } 1897 1898 module_usb_serial_driver(serial_drivers, id_table); 1899 1900 MODULE_DESCRIPTION(DRIVER_DESC); 1901 MODULE_LICENSE("GPL v2"); 1902