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