drivers/usb/serial/cp210x.c

   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  * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
   7  *
   8  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   9  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  10  * control thanks to Munir Nassar nassarmu@real-time.com
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/gpio/driver.h>
  23 #include <linux/bitops.h>
  24 #include <linux/mutex.h>
  25
  26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  27
  28 /*
  29  * Function Prototypes
  30  */
  31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  32 static void cp210x_close(struct usb_serial_port *);
  33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  34                                                         struct ktermios *);
  35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  36                                                         struct ktermios*);
  37 static bool cp210x_tx_empty(struct usb_serial_port *port);
  38 static int cp210x_tiocmget(struct tty_struct *);
  39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  41                 unsigned int, unsigned int);
  42 static void cp210x_break_ctl(struct tty_struct *, int);
  43 static int cp210x_attach(struct usb_serial *);
  44 static void cp210x_disconnect(struct usb_serial *);
  45 static void cp210x_release(struct usb_serial *);
  46 static int cp210x_port_probe(struct usb_serial_port *);
  47 static void cp210x_port_remove(struct usb_serial_port *);
  48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
  49 static void cp210x_process_read_urb(struct urb *urb);
  50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
  51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
  52
  53 static const struct usb_device_id id_table[] = {
  54         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  55         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  56         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  57         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  59         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  60         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  61         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  62         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  63         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  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, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 149         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 150         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 151         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 152         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 153         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 154         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 155         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 156         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 157         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 158         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 159         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 160         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 161         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 162         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 163         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 164         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 165         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 166         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 167         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 168         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 169         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 170         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 171         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 172         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 173         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 174         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 175         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 176         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 177         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 178         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 179         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 180         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 181         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 182         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 183         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 184         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 185         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 186         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 187         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 188         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 189         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 190         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 191         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 192         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 193         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 194         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 195         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 196         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 197         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 198         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 199         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 200         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 201         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 202         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 203         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 204         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 205         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 206         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 207         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 208         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 209         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 210         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 211         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 212         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 213         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 214         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 215         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 216         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 217         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 218         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 219         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 220         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 221         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 222         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 223         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 224         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 225         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 226         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 227         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 228         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 229         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 230         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 231         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 232         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 233         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 234         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 235         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 236         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 237         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 238         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 239         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 240         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 241         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 242         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 243         { } /* Terminating Entry */
 244 };
 245
 246 MODULE_DEVICE_TABLE(usb, id_table);
 247
 248 struct cp210x_serial_private {
 249 #ifdef CONFIG_GPIOLIB
 250         struct gpio_chip        gc;
 251         bool                    gpio_registered;
 252         u16                     gpio_pushpull;
 253         u16                     gpio_altfunc;
 254         u16                     gpio_input;
 255 #endif
 256         u8                      partnum;
 257         u32                     fw_version;
 258         speed_t                 min_speed;
 259         speed_t                 max_speed;
 260         bool                    use_actual_rate;
 261         bool                    no_flow_control;
 262         bool                    no_event_mode;
 263 };
 264
 265 enum cp210x_event_state {
 266         ES_DATA,
 267         ES_ESCAPE,
 268         ES_LSR,
 269         ES_LSR_DATA_0,
 270         ES_LSR_DATA_1,
 271         ES_MSR
 272 };
 273
 274 struct cp210x_port_private {
 275         u8                      bInterfaceNumber;
 276         bool                    event_mode;
 277         enum cp210x_event_state event_state;
 278         u8                      lsr;
 279
 280         struct mutex            mutex;
 281         bool                    crtscts;
 282         bool                    dtr;
 283         bool                    rts;
 284 };
 285
 286 static struct usb_serial_driver cp210x_device = {
 287         .driver = {
 288                 .owner =        THIS_MODULE,
 289                 .name =         "cp210x",
 290         },
 291         .id_table               = id_table,
 292         .num_ports              = 1,
 293         .bulk_in_size           = 256,
 294         .bulk_out_size          = 256,
 295         .open                   = cp210x_open,
 296         .close                  = cp210x_close,
 297         .break_ctl              = cp210x_break_ctl,
 298         .set_termios            = cp210x_set_termios,
 299         .tx_empty               = cp210x_tx_empty,
 300         .throttle               = usb_serial_generic_throttle,
 301         .unthrottle             = usb_serial_generic_unthrottle,
 302         .tiocmget               = cp210x_tiocmget,
 303         .tiocmset               = cp210x_tiocmset,
 304         .get_icount             = usb_serial_generic_get_icount,
 305         .attach                 = cp210x_attach,
 306         .disconnect             = cp210x_disconnect,
 307         .release                = cp210x_release,
 308         .port_probe             = cp210x_port_probe,
 309         .port_remove            = cp210x_port_remove,
 310         .dtr_rts                = cp210x_dtr_rts,
 311         .process_read_urb       = cp210x_process_read_urb,
 312 };
 313
 314 static struct usb_serial_driver * const serial_drivers[] = {
 315         &cp210x_device, NULL
 316 };
 317
 318 /* Config request types */
 319 #define REQTYPE_HOST_TO_INTERFACE       0x41
 320 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 321 #define REQTYPE_HOST_TO_DEVICE  0x40
 322 #define REQTYPE_DEVICE_TO_HOST  0xc0
 323
 324 /* Config request codes */
 325 #define CP210X_IFC_ENABLE       0x00
 326 #define CP210X_SET_BAUDDIV      0x01
 327 #define CP210X_GET_BAUDDIV      0x02
 328 #define CP210X_SET_LINE_CTL     0x03
 329 #define CP210X_GET_LINE_CTL     0x04
 330 #define CP210X_SET_BREAK        0x05
 331 #define CP210X_IMM_CHAR         0x06
 332 #define CP210X_SET_MHS          0x07
 333 #define CP210X_GET_MDMSTS       0x08
 334 #define CP210X_SET_XON          0x09
 335 #define CP210X_SET_XOFF         0x0A
 336 #define CP210X_SET_EVENTMASK    0x0B
 337 #define CP210X_GET_EVENTMASK    0x0C
 338 #define CP210X_SET_CHAR         0x0D
 339 #define CP210X_GET_CHARS        0x0E
 340 #define CP210X_GET_PROPS        0x0F
 341 #define CP210X_GET_COMM_STATUS  0x10
 342 #define CP210X_RESET            0x11
 343 #define CP210X_PURGE            0x12
 344 #define CP210X_SET_FLOW         0x13
 345 #define CP210X_GET_FLOW         0x14
 346 #define CP210X_EMBED_EVENTS     0x15
 347 #define CP210X_GET_EVENTSTATE   0x16
 348 #define CP210X_SET_CHARS        0x19
 349 #define CP210X_GET_BAUDRATE     0x1D
 350 #define CP210X_SET_BAUDRATE     0x1E
 351 #define CP210X_VENDOR_SPECIFIC  0xFF
 352
 353 /* CP210X_IFC_ENABLE */
 354 #define UART_ENABLE             0x0001
 355 #define UART_DISABLE            0x0000
 356
 357 /* CP210X_(SET|GET)_BAUDDIV */
 358 #define BAUD_RATE_GEN_FREQ      0x384000
 359
 360 /* CP210X_(SET|GET)_LINE_CTL */
 361 #define BITS_DATA_MASK          0X0f00
 362 #define BITS_DATA_5             0X0500
 363 #define BITS_DATA_6             0X0600
 364 #define BITS_DATA_7             0X0700
 365 #define BITS_DATA_8             0X0800
 366 #define BITS_DATA_9             0X0900
 367
 368 #define BITS_PARITY_MASK        0x00f0
 369 #define BITS_PARITY_NONE        0x0000
 370 #define BITS_PARITY_ODD         0x0010
 371 #define BITS_PARITY_EVEN        0x0020
 372 #define BITS_PARITY_MARK        0x0030
 373 #define BITS_PARITY_SPACE       0x0040
 374
 375 #define BITS_STOP_MASK          0x000f
 376 #define BITS_STOP_1             0x0000
 377 #define BITS_STOP_1_5           0x0001
 378 #define BITS_STOP_2             0x0002
 379
 380 /* CP210X_SET_BREAK */
 381 #define BREAK_ON                0x0001
 382 #define BREAK_OFF               0x0000
 383
 384 /* CP210X_(SET_MHS|GET_MDMSTS) */
 385 #define CONTROL_DTR             0x0001
 386 #define CONTROL_RTS             0x0002
 387 #define CONTROL_CTS             0x0010
 388 #define CONTROL_DSR             0x0020
 389 #define CONTROL_RING            0x0040
 390 #define CONTROL_DCD             0x0080
 391 #define CONTROL_WRITE_DTR       0x0100
 392 #define CONTROL_WRITE_RTS       0x0200
 393
 394 /* CP210X_(GET|SET)_CHARS */
 395 struct cp210x_special_chars {
 396         u8      bEofChar;
 397         u8      bErrorChar;
 398         u8      bBreakChar;
 399         u8      bEventChar;
 400         u8      bXonChar;
 401         u8      bXoffChar;
 402 };
 403
 404 /* CP210X_VENDOR_SPECIFIC values */
 405 #define CP210X_GET_FW_VER       0x000E
 406 #define CP210X_READ_2NCONFIG    0x000E
 407 #define CP210X_GET_FW_VER_2N    0x0010
 408 #define CP210X_READ_LATCH       0x00C2
 409 #define CP210X_GET_PARTNUM      0x370B
 410 #define CP210X_GET_PORTCONFIG   0x370C
 411 #define CP210X_GET_DEVICEMODE   0x3711
 412 #define CP210X_WRITE_LATCH      0x37E1
 413
 414 /* Part number definitions */
 415 #define CP210X_PARTNUM_CP2101   0x01
 416 #define CP210X_PARTNUM_CP2102   0x02
 417 #define CP210X_PARTNUM_CP2103   0x03
 418 #define CP210X_PARTNUM_CP2104   0x04
 419 #define CP210X_PARTNUM_CP2105   0x05
 420 #define CP210X_PARTNUM_CP2108   0x08
 421 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 422 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 423 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 424 #define CP210X_PARTNUM_UNKNOWN  0xFF
 425
 426 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 427 struct cp210x_comm_status {
 428         __le32   ulErrors;
 429         __le32   ulHoldReasons;
 430         __le32   ulAmountInInQueue;
 431         __le32   ulAmountInOutQueue;
 432         u8       bEofReceived;
 433         u8       bWaitForImmediate;
 434         u8       bReserved;
 435 } __packed;
 436
 437 /*
 438  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 439  * SiLabs app note AN571 gives a strange description of the 4 bits:
 440  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 441  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 442  */
 443 #define PURGE_ALL               0x000f
 444
 445 /* CP210X_EMBED_EVENTS */
 446 #define CP210X_ESCCHAR          0xec
 447
 448 #define CP210X_LSR_OVERRUN      BIT(1)
 449 #define CP210X_LSR_PARITY       BIT(2)
 450 #define CP210X_LSR_FRAME        BIT(3)
 451 #define CP210X_LSR_BREAK        BIT(4)
 452
 453
 454 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 455 struct cp210x_flow_ctl {
 456         __le32  ulControlHandshake;
 457         __le32  ulFlowReplace;
 458         __le32  ulXonLimit;
 459         __le32  ulXoffLimit;
 460 };
 461
 462 /* cp210x_flow_ctl::ulControlHandshake */
 463 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 464 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 465 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 466 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 467 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 468 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 469 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 470 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 471
 472 /* cp210x_flow_ctl::ulFlowReplace */
 473 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 474 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 475 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 476 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 477 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 478 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 479 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 480 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 481 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 482 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 483
 484 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 485 struct cp210x_pin_mode {
 486         u8      eci;
 487         u8      sci;
 488 };
 489
 490 #define CP210X_PIN_MODE_MODEM           0
 491 #define CP210X_PIN_MODE_GPIO            BIT(0)
 492
 493 /*
 494  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 495  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 496  */
 497 struct cp210x_dual_port_config {
 498         __le16  gpio_mode;
 499         u8      __pad0[2];
 500         __le16  reset_state;
 501         u8      __pad1[4];
 502         __le16  suspend_state;
 503         u8      sci_cfg;
 504         u8      eci_cfg;
 505         u8      device_cfg;
 506 } __packed;
 507
 508 /*
 509  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 510  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 511  */
 512 struct cp210x_single_port_config {
 513         __le16  gpio_mode;
 514         u8      __pad0[2];
 515         __le16  reset_state;
 516         u8      __pad1[4];
 517         __le16  suspend_state;
 518         u8      device_cfg;
 519 } __packed;
 520
 521 /* GPIO modes */
 522 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 523 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 524
 525 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 526 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 527
 528 #define CP210X_GPIO_MODE_OFFSET         8
 529 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 530
 531 /* CP2105 port configuration values */
 532 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 533 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 534 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 535
 536 /* CP2104 port configuration values */
 537 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 538 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 539 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 540
 541 struct cp210x_quad_port_state {
 542         __le16 gpio_mode_pb0;
 543         __le16 gpio_mode_pb1;
 544         __le16 gpio_mode_pb2;
 545         __le16 gpio_mode_pb3;
 546         __le16 gpio_mode_pb4;
 547
 548         __le16 gpio_lowpower_pb0;
 549         __le16 gpio_lowpower_pb1;
 550         __le16 gpio_lowpower_pb2;
 551         __le16 gpio_lowpower_pb3;
 552         __le16 gpio_lowpower_pb4;
 553
 554         __le16 gpio_latch_pb0;
 555         __le16 gpio_latch_pb1;
 556         __le16 gpio_latch_pb2;
 557         __le16 gpio_latch_pb3;
 558         __le16 gpio_latch_pb4;
 559 };
 560
 561 /*
 562  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 563  * on a CP2108 chip.
 564  *
 565  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 566  */
 567 struct cp210x_quad_port_config {
 568         struct cp210x_quad_port_state reset_state;
 569         struct cp210x_quad_port_state suspend_state;
 570         u8 ipdelay_ifc[4];
 571         u8 enhancedfxn_ifc[4];
 572         u8 enhancedfxn_device;
 573         u8 extclkfreq[4];
 574 } __packed;
 575
 576 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 577 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 578 #define CP2108_EF_IFC_GPIO_RS485                0x04
 579 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 580 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 581 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 582
 583 /* CP2102N configuration array indices */
 584 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 585 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 586 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 587 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 588
 589 /* CP2102N QFN20 port configuration values */
 590 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 591 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 592 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 593 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 594
 595 /*
 596  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 597  * for CP2102N, CP2103, CP2104 and CP2105.
 598  */
 599 struct cp210x_gpio_write {
 600         u8      mask;
 601         u8      state;
 602 };
 603
 604 /*
 605  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 606  * for CP2108.
 607  */
 608 struct cp210x_gpio_write16 {
 609         __le16  mask;
 610         __le16  state;
 611 };
 612
 613 /*
 614  * Helper to get interface number when we only have struct usb_serial.
 615  */
 616 static u8 cp210x_interface_num(struct usb_serial *serial)
 617 {
 618         struct usb_host_interface *cur_altsetting;
 619
 620         cur_altsetting = serial->interface->cur_altsetting;
 621
 622         return cur_altsetting->desc.bInterfaceNumber;
 623 }
 624
 625 /*
 626  * Reads a variable-sized block of CP210X_ registers, identified by req.
 627  * Returns data into buf in native USB byte order.
 628  */
 629 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 630                 void *buf, int bufsize)
 631 {
 632         struct usb_serial *serial = port->serial;
 633         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 634         int result;
 635
 636
 637         result = usb_control_msg_recv(serial->dev, 0, req,
 638                         REQTYPE_INTERFACE_TO_HOST, 0,
 639                         port_priv->bInterfaceNumber, buf, bufsize,
 640                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 641         if (result) {
 642                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 643                                 req, bufsize, result);
 644                 return result;
 645         }
 646
 647         return 0;
 648 }
 649
 650 /*
 651  * Reads any 8-bit CP210X_ register identified by req.
 652  */
 653 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 654 {
 655         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 656 }
 657
 658 /*
 659  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 660  * Returns data into buf in native USB byte order.
 661  */
 662 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 663                                     void *buf, int bufsize)
 664 {
 665         int result;
 666
 667         result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 668                         type, val, cp210x_interface_num(serial), buf, bufsize,
 669                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 670         if (result) {
 671                 dev_err(&serial->interface->dev,
 672                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 673                         bufsize, result);
 674                 return result;
 675         }
 676
 677         return 0;
 678 }
 679
 680 /*
 681  * Writes any 16-bit CP210X_ register (req) whose value is passed
 682  * entirely in the wValue field of the USB request.
 683  */
 684 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 685 {
 686         struct usb_serial *serial = port->serial;
 687         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 688         int result;
 689
 690         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 691                         req, REQTYPE_HOST_TO_INTERFACE, val,
 692                         port_priv->bInterfaceNumber, NULL, 0,
 693                         USB_CTRL_SET_TIMEOUT);
 694         if (result < 0) {
 695                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 696                                 req, result);
 697         }
 698
 699         return result;
 700 }
 701
 702 /*
 703  * Writes a variable-sized block of CP210X_ registers, identified by req.
 704  * Data in buf must be in native USB byte order.
 705  */
 706 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 707                 void *buf, int bufsize)
 708 {
 709         struct usb_serial *serial = port->serial;
 710         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 711         int result;
 712
 713         result = usb_control_msg_send(serial->dev, 0, req,
 714                         REQTYPE_HOST_TO_INTERFACE, 0,
 715                         port_priv->bInterfaceNumber, buf, bufsize,
 716                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 717         if (result) {
 718                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 719                                 req, bufsize, result);
 720                 return result;
 721         }
 722
 723         return 0;
 724 }
 725
 726 /*
 727  * Writes any 32-bit CP210X_ register identified by req.
 728  */
 729 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 730 {
 731         __le32 le32_val;
 732
 733         le32_val = cpu_to_le32(val);
 734
 735         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 736 }
 737
 738 #ifdef CONFIG_GPIOLIB
 739 /*
 740  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 741  * Data in buf must be in native USB byte order.
 742  */
 743 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 744                                      u16 val, void *buf, int bufsize)
 745 {
 746         int result;
 747
 748         result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 749                         type, val, cp210x_interface_num(serial), buf, bufsize,
 750                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 751         if (result) {
 752                 dev_err(&serial->interface->dev,
 753                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 754                         bufsize, result);
 755                 return result;
 756         }
 757
 758         return 0;
 759 }
 760 #endif
 761
 762 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 763 {
 764         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 765         int result;
 766
 767         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 768         if (result) {
 769                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 770                 return result;
 771         }
 772
 773         if (tty)
 774                 cp210x_set_termios(tty, port, NULL);
 775
 776         result = usb_serial_generic_open(tty, port);
 777         if (result)
 778                 goto err_disable;
 779
 780         return 0;
 781
 782 err_disable:
 783         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 784         port_priv->event_mode = false;
 785
 786         return result;
 787 }
 788
 789 static void cp210x_close(struct usb_serial_port *port)
 790 {
 791         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 792
 793         usb_serial_generic_close(port);
 794
 795         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 796         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 797
 798         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 799
 800         /* Disabling the interface disables event-insertion mode. */
 801         port_priv->event_mode = false;
 802 }
 803
 804 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 805 {
 806         if (lsr & CP210X_LSR_BREAK) {
 807                 port->icount.brk++;
 808                 *flag = TTY_BREAK;
 809         } else if (lsr & CP210X_LSR_PARITY) {
 810                 port->icount.parity++;
 811                 *flag = TTY_PARITY;
 812         } else if (lsr & CP210X_LSR_FRAME) {
 813                 port->icount.frame++;
 814                 *flag = TTY_FRAME;
 815         }
 816
 817         if (lsr & CP210X_LSR_OVERRUN) {
 818                 port->icount.overrun++;
 819                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 820         }
 821 }
 822
 823 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 824 {
 825         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 826
 827         switch (port_priv->event_state) {
 828         case ES_DATA:
 829                 if (*ch == CP210X_ESCCHAR) {
 830                         port_priv->event_state = ES_ESCAPE;
 831                         break;
 832                 }
 833                 return false;
 834         case ES_ESCAPE:
 835                 switch (*ch) {
 836                 case 0:
 837                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 838                         *ch = CP210X_ESCCHAR;
 839                         port_priv->event_state = ES_DATA;
 840                         return false;
 841                 case 1:
 842                         port_priv->event_state = ES_LSR_DATA_0;
 843                         break;
 844                 case 2:
 845                         port_priv->event_state = ES_LSR;
 846                         break;
 847                 case 3:
 848                         port_priv->event_state = ES_MSR;
 849                         break;
 850                 default:
 851                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 852                         port_priv->event_state = ES_DATA;
 853                         break;
 854                 }
 855                 break;
 856         case ES_LSR_DATA_0:
 857                 port_priv->lsr = *ch;
 858                 port_priv->event_state = ES_LSR_DATA_1;
 859                 break;
 860         case ES_LSR_DATA_1:
 861                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 862                                 __func__, port_priv->lsr, *ch);
 863                 cp210x_process_lsr(port, port_priv->lsr, flag);
 864                 port_priv->event_state = ES_DATA;
 865                 return false;
 866         case ES_LSR:
 867                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 868                 port_priv->lsr = *ch;
 869                 cp210x_process_lsr(port, port_priv->lsr, flag);
 870                 port_priv->event_state = ES_DATA;
 871                 break;
 872         case ES_MSR:
 873                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 874                 /* unimplemented */
 875                 port_priv->event_state = ES_DATA;
 876                 break;
 877         }
 878
 879         return true;
 880 }
 881
 882 static void cp210x_process_read_urb(struct urb *urb)
 883 {
 884         struct usb_serial_port *port = urb->context;
 885         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 886         unsigned char *ch = urb->transfer_buffer;
 887         char flag;
 888         int i;
 889
 890         if (!urb->actual_length)
 891                 return;
 892
 893         if (port_priv->event_mode) {
 894                 for (i = 0; i < urb->actual_length; i++, ch++) {
 895                         flag = TTY_NORMAL;
 896
 897                         if (cp210x_process_char(port, ch, &flag))
 898                                 continue;
 899
 900                         tty_insert_flip_char(&port->port, *ch, flag);
 901                 }
 902         } else {
 903                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 904         }
 905         tty_flip_buffer_push(&port->port);
 906 }
 907
 908 /*
 909  * Read how many bytes are waiting in the TX queue.
 910  */
 911 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 912                 u32 *count)
 913 {
 914         struct usb_serial *serial = port->serial;
 915         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 916         struct cp210x_comm_status sts;
 917         int result;
 918
 919         result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 920                         REQTYPE_INTERFACE_TO_HOST, 0,
 921                         port_priv->bInterfaceNumber, &sts, sizeof(sts),
 922                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 923         if (result) {
 924                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 925                 return result;
 926         }
 927
 928         *count = le32_to_cpu(sts.ulAmountInOutQueue);
 929
 930         return 0;
 931 }
 932
 933 static bool cp210x_tx_empty(struct usb_serial_port *port)
 934 {
 935         int err;
 936         u32 count;
 937
 938         err = cp210x_get_tx_queue_byte_count(port, &count);
 939         if (err)
 940                 return true;
 941
 942         return !count;
 943 }
 944
 945 struct cp210x_rate {
 946         speed_t rate;
 947         speed_t high;
 948 };
 949
 950 static const struct cp210x_rate cp210x_an205_table1[] = {
 951         { 300, 300 },
 952         { 600, 600 },
 953         { 1200, 1200 },
 954         { 1800, 1800 },
 955         { 2400, 2400 },
 956         { 4000, 4000 },
 957         { 4800, 4803 },
 958         { 7200, 7207 },
 959         { 9600, 9612 },
 960         { 14400, 14428 },
 961         { 16000, 16062 },
 962         { 19200, 19250 },
 963         { 28800, 28912 },
 964         { 38400, 38601 },
 965         { 51200, 51558 },
 966         { 56000, 56280 },
 967         { 57600, 58053 },
 968         { 64000, 64111 },
 969         { 76800, 77608 },
 970         { 115200, 117028 },
 971         { 128000, 129347 },
 972         { 153600, 156868 },
 973         { 230400, 237832 },
 974         { 250000, 254234 },
 975         { 256000, 273066 },
 976         { 460800, 491520 },
 977         { 500000, 567138 },
 978         { 576000, 670254 },
 979         { 921600, UINT_MAX }
 980 };
 981
 982 /*
 983  * Quantises the baud rate as per AN205 Table 1
 984  */
 985 static speed_t cp210x_get_an205_rate(speed_t baud)
 986 {
 987         int i;
 988
 989         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
 990                 if (baud <= cp210x_an205_table1[i].high)
 991                         break;
 992         }
 993
 994         return cp210x_an205_table1[i].rate;
 995 }
 996
 997 static speed_t cp210x_get_actual_rate(speed_t baud)
 998 {
 999         unsigned int prescale = 1;
1000         unsigned int div;
1001
1002         if (baud <= 365)
1003                 prescale = 4;
1004
1005         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1006         baud = 48000000 / (2 * prescale * div);
1007
1008         return baud;
1009 }
1010
1011 /*
1012  * CP2101 supports the following baud rates:
1013  *
1014  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1015  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1016  *
1017  * CP2102 and CP2103 support the following additional rates:
1018  *
1019  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1020  *      576000
1021  *
1022  * The device will map a requested rate to a supported one, but the result
1023  * of requests for rates greater than 1053257 is undefined (see AN205).
1024  *
1025  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1026  * respectively, with an error less than 1%. The actual rates are determined
1027  * by
1028  *
1029  *      div = round(freq / (2 x prescale x request))
1030  *      actual = freq / (2 x prescale x div)
1031  *
1032  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1033  * or 1 otherwise.
1034  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1035  * otherwise.
1036  */
1037 static void cp210x_change_speed(struct tty_struct *tty,
1038                 struct usb_serial_port *port, struct ktermios *old_termios)
1039 {
1040         struct usb_serial *serial = port->serial;
1041         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1042         u32 baud;
1043
1044         /*
1045          * This maps the requested rate to the actual rate, a valid rate on
1046          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1047          *
1048          * NOTE: B0 is not implemented.
1049          */
1050         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1051
1052         if (priv->use_actual_rate)
1053                 baud = cp210x_get_actual_rate(baud);
1054         else if (baud < 1000000)
1055                 baud = cp210x_get_an205_rate(baud);
1056
1057         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1058         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1059                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1060                 if (old_termios)
1061                         baud = old_termios->c_ospeed;
1062                 else
1063                         baud = 9600;
1064         }
1065
1066         tty_encode_baud_rate(tty, baud, baud);
1067 }
1068
1069 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1070 {
1071         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1072         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1073         int ret;
1074
1075         if (port_priv->event_mode)
1076                 return;
1077
1078         if (priv->no_event_mode)
1079                 return;
1080
1081         port_priv->event_state = ES_DATA;
1082         port_priv->event_mode = true;
1083
1084         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1085         if (ret) {
1086                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1087                 port_priv->event_mode = false;
1088         }
1089 }
1090
1091 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1092 {
1093         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1094         int ret;
1095
1096         if (!port_priv->event_mode)
1097                 return;
1098
1099         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1100         if (ret) {
1101                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1102                 return;
1103         }
1104
1105         port_priv->event_mode = false;
1106 }
1107
1108 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1109 {
1110         bool iflag_change, cc_change;
1111
1112         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1113         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1114                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1115
1116         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1117 }
1118
1119 static void cp210x_set_flow_control(struct tty_struct *tty,
1120                 struct usb_serial_port *port, struct ktermios *old_termios)
1121 {
1122         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1123         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1124         struct cp210x_special_chars chars;
1125         struct cp210x_flow_ctl flow_ctl;
1126         u32 flow_repl;
1127         u32 ctl_hs;
1128         bool crtscts;
1129         int ret;
1130
1131         /*
1132          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1133          * CP2102N_E104). Report back that flow control is not supported.
1134          */
1135         if (priv->no_flow_control) {
1136                 tty->termios.c_cflag &= ~CRTSCTS;
1137                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1138         }
1139
1140         if (old_termios &&
1141                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1142                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1143                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1144                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1145                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1146                 return;
1147         }
1148
1149         if (I_IXON(tty) || I_IXOFF(tty)) {
1150                 memset(&chars, 0, sizeof(chars));
1151
1152                 chars.bXonChar = START_CHAR(tty);
1153                 chars.bXoffChar = STOP_CHAR(tty);
1154
1155                 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1156                                 sizeof(chars));
1157                 if (ret) {
1158                         dev_err(&port->dev, "failed to set special chars: %d\n",
1159                                         ret);
1160                 }
1161         }
1162
1163         mutex_lock(&port_priv->mutex);
1164
1165         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1166                         sizeof(flow_ctl));
1167         if (ret)
1168                 goto out_unlock;
1169
1170         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1171         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1172
1173         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1174         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1175         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1176         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1177         if (port_priv->dtr)
1178                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1179         else
1180                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1181
1182         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1183         if (C_CRTSCTS(tty)) {
1184                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1185                 if (port_priv->rts)
1186                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1187                 else
1188                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1189                 crtscts = true;
1190         } else {
1191                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1192                 if (port_priv->rts)
1193                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1194                 else
1195                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1196                 crtscts = false;
1197         }
1198
1199         if (I_IXOFF(tty)) {
1200                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1201
1202                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1203                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1204         } else {
1205                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1206         }
1207
1208         if (I_IXON(tty))
1209                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1210         else
1211                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1212
1213         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1214                         ctl_hs, flow_repl);
1215
1216         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1217         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1218
1219         ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1220                         sizeof(flow_ctl));
1221         if (ret)
1222                 goto out_unlock;
1223
1224         port_priv->crtscts = crtscts;
1225 out_unlock:
1226         mutex_unlock(&port_priv->mutex);
1227 }
1228
1229 static void cp210x_set_termios(struct tty_struct *tty,
1230                 struct usb_serial_port *port, struct ktermios *old_termios)
1231 {
1232         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1233         u16 bits;
1234         int ret;
1235
1236         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1237                 return;
1238
1239         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1240                 cp210x_change_speed(tty, port, old_termios);
1241
1242         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1243         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1244                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1245                 tty->termios.c_cflag |= CS8;
1246         }
1247
1248         bits = 0;
1249
1250         switch (C_CSIZE(tty)) {
1251         case CS5:
1252                 bits |= BITS_DATA_5;
1253                 break;
1254         case CS6:
1255                 bits |= BITS_DATA_6;
1256                 break;
1257         case CS7:
1258                 bits |= BITS_DATA_7;
1259                 break;
1260         case CS8:
1261         default:
1262                 bits |= BITS_DATA_8;
1263                 break;
1264         }
1265
1266         if (C_PARENB(tty)) {
1267                 if (C_CMSPAR(tty)) {
1268                         if (C_PARODD(tty))
1269                                 bits |= BITS_PARITY_MARK;
1270                         else
1271                                 bits |= BITS_PARITY_SPACE;
1272                 } else {
1273                         if (C_PARODD(tty))
1274                                 bits |= BITS_PARITY_ODD;
1275                         else
1276                                 bits |= BITS_PARITY_EVEN;
1277                 }
1278         }
1279
1280         if (C_CSTOPB(tty))
1281                 bits |= BITS_STOP_2;
1282         else
1283                 bits |= BITS_STOP_1;
1284
1285         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1286         if (ret)
1287                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1288
1289         cp210x_set_flow_control(tty, port, old_termios);
1290
1291         /*
1292          * Enable event-insertion mode only if input parity checking is
1293          * enabled for now.
1294          */
1295         if (I_INPCK(tty))
1296                 cp210x_enable_event_mode(port);
1297         else
1298                 cp210x_disable_event_mode(port);
1299 }
1300
1301 static int cp210x_tiocmset(struct tty_struct *tty,
1302                 unsigned int set, unsigned int clear)
1303 {
1304         struct usb_serial_port *port = tty->driver_data;
1305         return cp210x_tiocmset_port(port, set, clear);
1306 }
1307
1308 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1309                 unsigned int set, unsigned int clear)
1310 {
1311         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1312         struct cp210x_flow_ctl flow_ctl;
1313         u32 ctl_hs, flow_repl;
1314         u16 control = 0;
1315         int ret;
1316
1317         mutex_lock(&port_priv->mutex);
1318
1319         if (set & TIOCM_RTS) {
1320                 port_priv->rts = true;
1321                 control |= CONTROL_RTS;
1322                 control |= CONTROL_WRITE_RTS;
1323         }
1324         if (set & TIOCM_DTR) {
1325                 port_priv->dtr = true;
1326                 control |= CONTROL_DTR;
1327                 control |= CONTROL_WRITE_DTR;
1328         }
1329         if (clear & TIOCM_RTS) {
1330                 port_priv->rts = false;
1331                 control &= ~CONTROL_RTS;
1332                 control |= CONTROL_WRITE_RTS;
1333         }
1334         if (clear & TIOCM_DTR) {
1335                 port_priv->dtr = false;
1336                 control &= ~CONTROL_DTR;
1337                 control |= CONTROL_WRITE_DTR;
1338         }
1339
1340         /*
1341          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1342          * flow control is enabled.
1343          */
1344         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1345                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1346                                 sizeof(flow_ctl));
1347                 if (ret)
1348                         goto out_unlock;
1349
1350                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1351                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1352
1353                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1354                 if (port_priv->dtr)
1355                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1356                 else
1357                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1358
1359                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1360                 if (port_priv->rts)
1361                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1362                 else
1363                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1364
1365                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1366                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1367
1368                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1369                                 __func__, ctl_hs, flow_repl);
1370
1371                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1372                                 sizeof(flow_ctl));
1373         } else {
1374                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1375
1376                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1377         }
1378 out_unlock:
1379         mutex_unlock(&port_priv->mutex);
1380
1381         return ret;
1382 }
1383
1384 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1385 {
1386         if (on)
1387                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1388         else
1389                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1390 }
1391
1392 static int cp210x_tiocmget(struct tty_struct *tty)
1393 {
1394         struct usb_serial_port *port = tty->driver_data;
1395         u8 control;
1396         int result;
1397
1398         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1399         if (result)
1400                 return result;
1401
1402         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1403                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1404                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1405                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1406                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1407                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1408
1409         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1410
1411         return result;
1412 }
1413
1414 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1415 {
1416         struct usb_serial_port *port = tty->driver_data;
1417         u16 state;
1418
1419         if (break_state == 0)
1420                 state = BREAK_OFF;
1421         else
1422                 state = BREAK_ON;
1423         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1424                 state == BREAK_OFF ? "off" : "on");
1425         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1426 }
1427
1428 #ifdef CONFIG_GPIOLIB
1429 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1430 {
1431         struct usb_serial *serial = gpiochip_get_data(gc);
1432         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1433         u8 req_type;
1434         u16 mask;
1435         int result;
1436         int len;
1437
1438         result = usb_autopm_get_interface(serial->interface);
1439         if (result)
1440                 return result;
1441
1442         switch (priv->partnum) {
1443         case CP210X_PARTNUM_CP2105:
1444                 req_type = REQTYPE_INTERFACE_TO_HOST;
1445                 len = 1;
1446                 break;
1447         case CP210X_PARTNUM_CP2108:
1448                 req_type = REQTYPE_INTERFACE_TO_HOST;
1449                 len = 2;
1450                 break;
1451         default:
1452                 req_type = REQTYPE_DEVICE_TO_HOST;
1453                 len = 1;
1454                 break;
1455         }
1456
1457         mask = 0;
1458         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1459                                           &mask, len);
1460
1461         usb_autopm_put_interface(serial->interface);
1462
1463         if (result < 0)
1464                 return result;
1465
1466         le16_to_cpus(&mask);
1467
1468         return !!(mask & BIT(gpio));
1469 }
1470
1471 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1472 {
1473         struct usb_serial *serial = gpiochip_get_data(gc);
1474         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1475         struct cp210x_gpio_write16 buf16;
1476         struct cp210x_gpio_write buf;
1477         u16 mask, state;
1478         u16 wIndex;
1479         int result;
1480
1481         if (value == 1)
1482                 state = BIT(gpio);
1483         else
1484                 state = 0;
1485
1486         mask = BIT(gpio);
1487
1488         result = usb_autopm_get_interface(serial->interface);
1489         if (result)
1490                 goto out;
1491
1492         switch (priv->partnum) {
1493         case CP210X_PARTNUM_CP2105:
1494                 buf.mask = (u8)mask;
1495                 buf.state = (u8)state;
1496                 result = cp210x_write_vendor_block(serial,
1497                                                    REQTYPE_HOST_TO_INTERFACE,
1498                                                    CP210X_WRITE_LATCH, &buf,
1499                                                    sizeof(buf));
1500                 break;
1501         case CP210X_PARTNUM_CP2108:
1502                 buf16.mask = cpu_to_le16(mask);
1503                 buf16.state = cpu_to_le16(state);
1504                 result = cp210x_write_vendor_block(serial,
1505                                                    REQTYPE_HOST_TO_INTERFACE,
1506                                                    CP210X_WRITE_LATCH, &buf16,
1507                                                    sizeof(buf16));
1508                 break;
1509         default:
1510                 wIndex = state << 8 | mask;
1511                 result = usb_control_msg(serial->dev,
1512                                          usb_sndctrlpipe(serial->dev, 0),
1513                                          CP210X_VENDOR_SPECIFIC,
1514                                          REQTYPE_HOST_TO_DEVICE,
1515                                          CP210X_WRITE_LATCH,
1516                                          wIndex,
1517                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1518                 break;
1519         }
1520
1521         usb_autopm_put_interface(serial->interface);
1522 out:
1523         if (result < 0) {
1524                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1525                                 result);
1526         }
1527 }
1528
1529 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1530 {
1531         struct usb_serial *serial = gpiochip_get_data(gc);
1532         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1533
1534         return priv->gpio_input & BIT(gpio);
1535 }
1536
1537 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1538 {
1539         struct usb_serial *serial = gpiochip_get_data(gc);
1540         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1541
1542         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1543                 /* hardware does not support an input mode */
1544                 return -ENOTSUPP;
1545         }
1546
1547         /* push-pull pins cannot be changed to be inputs */
1548         if (priv->gpio_pushpull & BIT(gpio))
1549                 return -EINVAL;
1550
1551         /* make sure to release pin if it is being driven low */
1552         cp210x_gpio_set(gc, gpio, 1);
1553
1554         priv->gpio_input |= BIT(gpio);
1555
1556         return 0;
1557 }
1558
1559 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1560                                         int value)
1561 {
1562         struct usb_serial *serial = gpiochip_get_data(gc);
1563         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1564
1565         priv->gpio_input &= ~BIT(gpio);
1566         cp210x_gpio_set(gc, gpio, value);
1567
1568         return 0;
1569 }
1570
1571 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1572                                   unsigned long config)
1573 {
1574         struct usb_serial *serial = gpiochip_get_data(gc);
1575         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1576         enum pin_config_param param = pinconf_to_config_param(config);
1577
1578         /* Succeed only if in correct mode (this can't be set at runtime) */
1579         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1580             (priv->gpio_pushpull & BIT(gpio)))
1581                 return 0;
1582
1583         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1584             !(priv->gpio_pushpull & BIT(gpio)))
1585                 return 0;
1586
1587         return -ENOTSUPP;
1588 }
1589
1590 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1591                 unsigned long *valid_mask, unsigned int ngpios)
1592 {
1593         struct usb_serial *serial = gpiochip_get_data(gc);
1594         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1595         struct device *dev = &serial->interface->dev;
1596         unsigned long altfunc_mask = priv->gpio_altfunc;
1597
1598         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1599
1600         if (bitmap_empty(valid_mask, ngpios))
1601                 dev_dbg(dev, "no pin configured for GPIO\n");
1602         else
1603                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1604                                 valid_mask);
1605         return 0;
1606 }
1607
1608 /*
1609  * This function is for configuring GPIO using shared pins, where other signals
1610  * are made unavailable by configuring the use of GPIO. This is believed to be
1611  * only applicable to the cp2105 at this point, the other devices supported by
1612  * this driver that provide GPIO do so in a way that does not impact other
1613  * signals and are thus expected to have very different initialisation.
1614  */
1615 static int cp2105_gpioconf_init(struct usb_serial *serial)
1616 {
1617         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1618         struct cp210x_pin_mode mode;
1619         struct cp210x_dual_port_config config;
1620         u8 intf_num = cp210x_interface_num(serial);
1621         u8 iface_config;
1622         int result;
1623
1624         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1625                                           CP210X_GET_DEVICEMODE, &mode,
1626                                           sizeof(mode));
1627         if (result < 0)
1628                 return result;
1629
1630         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1631                                           CP210X_GET_PORTCONFIG, &config,
1632                                           sizeof(config));
1633         if (result < 0)
1634                 return result;
1635
1636         /*  2 banks of GPIO - One for the pins taken from each serial port */
1637         if (intf_num == 0) {
1638                 priv->gc.ngpio = 2;
1639
1640                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1641                         /* mark all GPIOs of this interface as reserved */
1642                         priv->gpio_altfunc = 0xff;
1643                         return 0;
1644                 }
1645
1646                 iface_config = config.eci_cfg;
1647                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1648                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1649                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1650         } else if (intf_num == 1) {
1651                 priv->gc.ngpio = 3;
1652
1653                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1654                         /* mark all GPIOs of this interface as reserved */
1655                         priv->gpio_altfunc = 0xff;
1656                         return 0;
1657                 }
1658
1659                 iface_config = config.sci_cfg;
1660                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1661                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1662                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1663         } else {
1664                 return -ENODEV;
1665         }
1666
1667         /* mark all pins which are not in GPIO mode */
1668         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1669                 priv->gpio_altfunc |= BIT(0);
1670         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1671                         CP2105_GPIO1_RS485_MODE))
1672                 priv->gpio_altfunc |= BIT(1);
1673
1674         /* driver implementation for CP2105 only supports outputs */
1675         priv->gpio_input = 0;
1676
1677         return 0;
1678 }
1679
1680 static int cp2104_gpioconf_init(struct usb_serial *serial)
1681 {
1682         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1683         struct cp210x_single_port_config config;
1684         u8 iface_config;
1685         u8 gpio_latch;
1686         int result;
1687         u8 i;
1688
1689         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1690                                           CP210X_GET_PORTCONFIG, &config,
1691                                           sizeof(config));
1692         if (result < 0)
1693                 return result;
1694
1695         priv->gc.ngpio = 4;
1696
1697         iface_config = config.device_cfg;
1698         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1699                                         CP210X_GPIO_MODE_MASK) >>
1700                                         CP210X_GPIO_MODE_OFFSET);
1701         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1702                                         CP210X_GPIO_MODE_MASK) >>
1703                                         CP210X_GPIO_MODE_OFFSET);
1704
1705         /* mark all pins which are not in GPIO mode */
1706         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1707                 priv->gpio_altfunc |= BIT(0);
1708         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1709                 priv->gpio_altfunc |= BIT(1);
1710         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1711                 priv->gpio_altfunc |= BIT(2);
1712
1713         /*
1714          * Like CP2102N, CP2104 has also no strict input and output pin
1715          * modes.
1716          * Do the same input mode emulation as CP2102N.
1717          */
1718         for (i = 0; i < priv->gc.ngpio; ++i) {
1719                 /*
1720                  * Set direction to "input" iff pin is open-drain and reset
1721                  * value is 1.
1722                  */
1723                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1724                         priv->gpio_input |= BIT(i);
1725         }
1726
1727         return 0;
1728 }
1729
1730 static int cp2108_gpio_init(struct usb_serial *serial)
1731 {
1732         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1733         struct cp210x_quad_port_config config;
1734         u16 gpio_latch;
1735         int result;
1736         u8 i;
1737
1738         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1739                                           CP210X_GET_PORTCONFIG, &config,
1740                                           sizeof(config));
1741         if (result < 0)
1742                 return result;
1743
1744         priv->gc.ngpio = 16;
1745         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1746         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1747
1748         /*
1749          * Mark all pins which are not in GPIO mode.
1750          *
1751          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1752          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1753          *
1754          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1755          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1756          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1757          */
1758         for (i = 0; i < 4; i++) {
1759                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1760                         priv->gpio_altfunc |= BIT(i * 4);
1761                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1762                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1763                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1764                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1765                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1766                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1767         }
1768
1769         /*
1770          * Like CP2102N, CP2108 has also no strict input and output pin
1771          * modes. Do the same input mode emulation as CP2102N.
1772          */
1773         for (i = 0; i < priv->gc.ngpio; ++i) {
1774                 /*
1775                  * Set direction to "input" iff pin is open-drain and reset
1776                  * value is 1.
1777                  */
1778                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1779                         priv->gpio_input |= BIT(i);
1780         }
1781
1782         return 0;
1783 }
1784
1785 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1786 {
1787         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1788         const u16 config_size = 0x02a6;
1789         u8 gpio_rst_latch;
1790         u8 config_version;
1791         u8 gpio_pushpull;
1792         u8 *config_buf;
1793         u8 gpio_latch;
1794         u8 gpio_ctrl;
1795         int result;
1796         u8 i;
1797
1798         /*
1799          * Retrieve device configuration from the device.
1800          * The array received contains all customization settings done at the
1801          * factory/manufacturer. Format of the array is documented at the
1802          * time of writing at:
1803          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1804          */
1805         config_buf = kmalloc(config_size, GFP_KERNEL);
1806         if (!config_buf)
1807                 return -ENOMEM;
1808
1809         result = cp210x_read_vendor_block(serial,
1810                                           REQTYPE_DEVICE_TO_HOST,
1811                                           CP210X_READ_2NCONFIG,
1812                                           config_buf,
1813                                           config_size);
1814         if (result < 0) {
1815                 kfree(config_buf);
1816                 return result;
1817         }
1818
1819         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1820         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1821         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1822         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1823
1824         kfree(config_buf);
1825
1826         /* Make sure this is a config format we understand. */
1827         if (config_version != 0x01)
1828                 return -ENOTSUPP;
1829
1830         priv->gc.ngpio = 4;
1831
1832         /*
1833          * Get default pin states after reset. Needed so we can determine
1834          * the direction of an open-drain pin.
1835          */
1836         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1837
1838         /* 0 indicates open-drain mode, 1 is push-pull */
1839         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1840
1841         /* 0 indicates GPIO mode, 1 is alternate function */
1842         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1843                 /* QFN20 is special... */
1844                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1845                         priv->gpio_altfunc |= BIT(0);
1846                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1847                         priv->gpio_altfunc |= BIT(1);
1848                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1849                         priv->gpio_altfunc |= BIT(2);
1850                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1851                         priv->gpio_altfunc |= BIT(3);
1852         } else {
1853                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1854         }
1855
1856         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1857                 /*
1858                  * For the QFN28 package, GPIO4-6 are controlled by
1859                  * the low three bits of the mode/latch fields.
1860                  * Contrary to the document linked above, the bits for
1861                  * the SUSPEND pins are elsewhere.  No alternate
1862                  * function is available for these pins.
1863                  */
1864                 priv->gc.ngpio = 7;
1865                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1866                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1867         }
1868
1869         /*
1870          * The CP2102N does not strictly has input and output pin modes,
1871          * it only knows open-drain and push-pull modes which is set at
1872          * factory. An open-drain pin can function both as an
1873          * input or an output. We emulate input mode for open-drain pins
1874          * by making sure they are not driven low, and we do not allow
1875          * push-pull pins to be set as an input.
1876          */
1877         for (i = 0; i < priv->gc.ngpio; ++i) {
1878                 /*
1879                  * Set direction to "input" iff pin is open-drain and reset
1880                  * value is 1.
1881                  */
1882                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1883                         priv->gpio_input |= BIT(i);
1884         }
1885
1886         return 0;
1887 }
1888
1889 static int cp210x_gpio_init(struct usb_serial *serial)
1890 {
1891         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1892         int result;
1893
1894         switch (priv->partnum) {
1895         case CP210X_PARTNUM_CP2104:
1896                 result = cp2104_gpioconf_init(serial);
1897                 break;
1898         case CP210X_PARTNUM_CP2105:
1899                 result = cp2105_gpioconf_init(serial);
1900                 break;
1901         case CP210X_PARTNUM_CP2108:
1902                 /*
1903                  * The GPIOs are not tied to any specific port so only register
1904                  * once for interface 0.
1905                  */
1906                 if (cp210x_interface_num(serial) != 0)
1907                         return 0;
1908                 result = cp2108_gpio_init(serial);
1909                 break;
1910         case CP210X_PARTNUM_CP2102N_QFN28:
1911         case CP210X_PARTNUM_CP2102N_QFN24:
1912         case CP210X_PARTNUM_CP2102N_QFN20:
1913                 result = cp2102n_gpioconf_init(serial);
1914                 break;
1915         default:
1916                 return 0;
1917         }
1918
1919         if (result < 0)
1920                 return result;
1921
1922         priv->gc.label = "cp210x";
1923         priv->gc.get_direction = cp210x_gpio_direction_get;
1924         priv->gc.direction_input = cp210x_gpio_direction_input;
1925         priv->gc.direction_output = cp210x_gpio_direction_output;
1926         priv->gc.get = cp210x_gpio_get;
1927         priv->gc.set = cp210x_gpio_set;
1928         priv->gc.set_config = cp210x_gpio_set_config;
1929         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1930         priv->gc.owner = THIS_MODULE;
1931         priv->gc.parent = &serial->interface->dev;
1932         priv->gc.base = -1;
1933         priv->gc.can_sleep = true;
1934
1935         result = gpiochip_add_data(&priv->gc, serial);
1936         if (!result)
1937                 priv->gpio_registered = true;
1938
1939         return result;
1940 }
1941
1942 static void cp210x_gpio_remove(struct usb_serial *serial)
1943 {
1944         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1945
1946         if (priv->gpio_registered) {
1947                 gpiochip_remove(&priv->gc);
1948                 priv->gpio_registered = false;
1949         }
1950 }
1951
1952 #else
1953
1954 static int cp210x_gpio_init(struct usb_serial *serial)
1955 {
1956         return 0;
1957 }
1958
1959 static void cp210x_gpio_remove(struct usb_serial *serial)
1960 {
1961         /* Nothing to do */
1962 }
1963
1964 #endif
1965
1966 static int cp210x_port_probe(struct usb_serial_port *port)
1967 {
1968         struct usb_serial *serial = port->serial;
1969         struct cp210x_port_private *port_priv;
1970
1971         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1972         if (!port_priv)
1973                 return -ENOMEM;
1974
1975         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1976         mutex_init(&port_priv->mutex);
1977
1978         usb_set_serial_port_data(port, port_priv);
1979
1980         return 0;
1981 }
1982
1983 static void cp210x_port_remove(struct usb_serial_port *port)
1984 {
1985         struct cp210x_port_private *port_priv;
1986
1987         port_priv = usb_get_serial_port_data(port);
1988         kfree(port_priv);
1989 }
1990
1991 static void cp210x_init_max_speed(struct usb_serial *serial)
1992 {
1993         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1994         bool use_actual_rate = false;
1995         speed_t min = 300;
1996         speed_t max;
1997
1998         switch (priv->partnum) {
1999         case CP210X_PARTNUM_CP2101:
2000                 max = 921600;
2001                 break;
2002         case CP210X_PARTNUM_CP2102:
2003         case CP210X_PARTNUM_CP2103:
2004                 max = 1000000;
2005                 break;
2006         case CP210X_PARTNUM_CP2104:
2007                 use_actual_rate = true;
2008                 max = 2000000;
2009                 break;
2010         case CP210X_PARTNUM_CP2108:
2011                 max = 2000000;
2012                 break;
2013         case CP210X_PARTNUM_CP2105:
2014                 if (cp210x_interface_num(serial) == 0) {
2015                         use_actual_rate = true;
2016                         max = 2000000;  /* ECI */
2017                 } else {
2018                         min = 2400;
2019                         max = 921600;   /* SCI */
2020                 }
2021                 break;
2022         case CP210X_PARTNUM_CP2102N_QFN28:
2023         case CP210X_PARTNUM_CP2102N_QFN24:
2024         case CP210X_PARTNUM_CP2102N_QFN20:
2025                 use_actual_rate = true;
2026                 max = 3000000;
2027                 break;
2028         default:
2029                 max = 2000000;
2030                 break;
2031         }
2032
2033         priv->min_speed = min;
2034         priv->max_speed = max;
2035         priv->use_actual_rate = use_actual_rate;
2036 }
2037
2038 static void cp2102_determine_quirks(struct usb_serial *serial)
2039 {
2040         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2041         u8 *buf;
2042         int ret;
2043
2044         buf = kmalloc(2, GFP_KERNEL);
2045         if (!buf)
2046                 return;
2047         /*
2048          * Some (possibly counterfeit) CP2102 do not support event-insertion
2049          * mode and respond differently to malformed vendor requests.
2050          * Specifically, they return one instead of two bytes when sent a
2051          * two-byte part-number request.
2052          */
2053         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2054                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2055                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2056         if (ret == 1) {
2057                 dev_dbg(&serial->interface->dev,
2058                                 "device does not support event-insertion mode\n");
2059                 priv->no_event_mode = true;
2060         }
2061
2062         kfree(buf);
2063 }
2064
2065 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2066 {
2067         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2068         u8 ver[3];
2069         int ret;
2070
2071         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2072                         ver, sizeof(ver));
2073         if (ret)
2074                 return ret;
2075
2076         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2077                         ver[0], ver[1], ver[2]);
2078
2079         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2080
2081         return 0;
2082 }
2083
2084 static void cp210x_determine_type(struct usb_serial *serial)
2085 {
2086         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2087         int ret;
2088
2089         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2090                         CP210X_GET_PARTNUM, &priv->partnum,
2091                         sizeof(priv->partnum));
2092         if (ret < 0) {
2093                 dev_warn(&serial->interface->dev,
2094                                 "querying part number failed\n");
2095                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2096                 return;
2097         }
2098
2099         dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2100
2101         switch (priv->partnum) {
2102         case CP210X_PARTNUM_CP2102:
2103                 cp2102_determine_quirks(serial);
2104                 break;
2105         case CP210X_PARTNUM_CP2105:
2106         case CP210X_PARTNUM_CP2108:
2107                 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2108                 break;
2109         case CP210X_PARTNUM_CP2102N_QFN28:
2110         case CP210X_PARTNUM_CP2102N_QFN24:
2111         case CP210X_PARTNUM_CP2102N_QFN20:
2112                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2113                 if (ret)
2114                         break;
2115                 if (priv->fw_version <= 0x10004)
2116                         priv->no_flow_control = true;
2117                 break;
2118         default:
2119                 break;
2120         }
2121 }
2122
2123 static int cp210x_attach(struct usb_serial *serial)
2124 {
2125         int result;
2126         struct cp210x_serial_private *priv;
2127
2128         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2129         if (!priv)
2130                 return -ENOMEM;
2131
2132         usb_set_serial_data(serial, priv);
2133
2134         cp210x_determine_type(serial);
2135         cp210x_init_max_speed(serial);
2136
2137         result = cp210x_gpio_init(serial);
2138         if (result < 0) {
2139                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2140                                 result);
2141         }
2142
2143         return 0;
2144 }
2145
2146 static void cp210x_disconnect(struct usb_serial *serial)
2147 {
2148         cp210x_gpio_remove(serial);
2149 }
2150
2151 static void cp210x_release(struct usb_serial *serial)
2152 {
2153         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2154
2155         cp210x_gpio_remove(serial);
2156
2157         kfree(priv);
2158 }
2159
2160 module_usb_serial_driver(serial_drivers, id_table);
2161
2162 MODULE_DESCRIPTION(DRIVER_DESC);
2163 MODULE_LICENSE("GPL v2");