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(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  65         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  66         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  67         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  68         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  69         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  70         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  71         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  72         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  73         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  74         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  75         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  76         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  77         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  78         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  79         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  80         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  81         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  82         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  83         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  84         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  85         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  86         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  87         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  88         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  89         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  90         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  91         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  92         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  93         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  94         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  95         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  96         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  97         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
  98         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  99         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 100         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 101         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 102         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 103         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 104         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 105         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 106         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 107         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 108         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 109         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 110         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 111         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 112         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 113         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 114         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 115         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 116         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 117         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 118         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 119         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 120         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 121         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 122         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 123         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 124         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 125         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 126         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 127         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 128         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 129         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 130         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 131         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 132         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 133         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 134         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 135         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 136         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 137         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 138         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 139         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 140         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 141         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 142         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 143         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 144         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 145         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 146         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 147         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 148         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 149         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 150         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 151         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 152         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 153         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 154         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 155         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 156         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 157         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 158         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 159         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 160         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 161         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 162         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 163         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 164         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 165         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 166         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 167         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 168         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 169         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 170         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 171         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 172         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 173         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 174         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 175         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 176         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 177         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 178         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 179         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 180         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 181         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 182         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 183         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 184         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 185         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 186         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 187         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 188         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 189         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 190         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 191         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 192         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 193         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 194         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 195         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 196         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 197         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 198         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 199         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 200         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 201         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 202         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 203         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 204         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 205         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 206         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 207         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 208         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 209         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 210         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 211         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 212         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 213         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 214         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 215         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 216         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 217         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 218         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 219         { } /* Terminating Entry */
 220 };
 221
 222 MODULE_DEVICE_TABLE(usb, id_table);
 223
 224 struct cp210x_serial_private {
 225 #ifdef CONFIG_GPIOLIB
 226         struct gpio_chip        gc;
 227         u8                      config;
 228         u8                      gpio_mode;
 229         bool                    gpio_registered;
 230 #endif
 231         u8                      partnum;
 232         speed_t                 max_speed;
 233 };
 234
 235 struct cp210x_port_private {
 236         __u8                    bInterfaceNumber;
 237         bool                    has_swapped_line_ctl;
 238 };
 239
 240 static struct usb_serial_driver cp210x_device = {
 241         .driver = {
 242                 .owner =        THIS_MODULE,
 243                 .name =         "cp210x",
 244         },
 245         .id_table               = id_table,
 246         .num_ports              = 1,
 247         .bulk_in_size           = 256,
 248         .bulk_out_size          = 256,
 249         .open                   = cp210x_open,
 250         .close                  = cp210x_close,
 251         .break_ctl              = cp210x_break_ctl,
 252         .set_termios            = cp210x_set_termios,
 253         .tx_empty               = cp210x_tx_empty,
 254         .tiocmget               = cp210x_tiocmget,
 255         .tiocmset               = cp210x_tiocmset,
 256         .attach                 = cp210x_attach,
 257         .disconnect             = cp210x_disconnect,
 258         .release                = cp210x_release,
 259         .port_probe             = cp210x_port_probe,
 260         .port_remove            = cp210x_port_remove,
 261         .dtr_rts                = cp210x_dtr_rts
 262 };
 263
 264 static struct usb_serial_driver * const serial_drivers[] = {
 265         &cp210x_device, NULL
 266 };
 267
 268 /* Config request types */
 269 #define REQTYPE_HOST_TO_INTERFACE       0x41
 270 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 271 #define REQTYPE_HOST_TO_DEVICE  0x40
 272 #define REQTYPE_DEVICE_TO_HOST  0xc0
 273
 274 /* Config request codes */
 275 #define CP210X_IFC_ENABLE       0x00
 276 #define CP210X_SET_BAUDDIV      0x01
 277 #define CP210X_GET_BAUDDIV      0x02
 278 #define CP210X_SET_LINE_CTL     0x03
 279 #define CP210X_GET_LINE_CTL     0x04
 280 #define CP210X_SET_BREAK        0x05
 281 #define CP210X_IMM_CHAR         0x06
 282 #define CP210X_SET_MHS          0x07
 283 #define CP210X_GET_MDMSTS       0x08
 284 #define CP210X_SET_XON          0x09
 285 #define CP210X_SET_XOFF         0x0A
 286 #define CP210X_SET_EVENTMASK    0x0B
 287 #define CP210X_GET_EVENTMASK    0x0C
 288 #define CP210X_SET_CHAR         0x0D
 289 #define CP210X_GET_CHARS        0x0E
 290 #define CP210X_GET_PROPS        0x0F
 291 #define CP210X_GET_COMM_STATUS  0x10
 292 #define CP210X_RESET            0x11
 293 #define CP210X_PURGE            0x12
 294 #define CP210X_SET_FLOW         0x13
 295 #define CP210X_GET_FLOW         0x14
 296 #define CP210X_EMBED_EVENTS     0x15
 297 #define CP210X_GET_EVENTSTATE   0x16
 298 #define CP210X_SET_CHARS        0x19
 299 #define CP210X_GET_BAUDRATE     0x1D
 300 #define CP210X_SET_BAUDRATE     0x1E
 301 #define CP210X_VENDOR_SPECIFIC  0xFF
 302
 303 /* CP210X_IFC_ENABLE */
 304 #define UART_ENABLE             0x0001
 305 #define UART_DISABLE            0x0000
 306
 307 /* CP210X_(SET|GET)_BAUDDIV */
 308 #define BAUD_RATE_GEN_FREQ      0x384000
 309
 310 /* CP210X_(SET|GET)_LINE_CTL */
 311 #define BITS_DATA_MASK          0X0f00
 312 #define BITS_DATA_5             0X0500
 313 #define BITS_DATA_6             0X0600
 314 #define BITS_DATA_7             0X0700
 315 #define BITS_DATA_8             0X0800
 316 #define BITS_DATA_9             0X0900
 317
 318 #define BITS_PARITY_MASK        0x00f0
 319 #define BITS_PARITY_NONE        0x0000
 320 #define BITS_PARITY_ODD         0x0010
 321 #define BITS_PARITY_EVEN        0x0020
 322 #define BITS_PARITY_MARK        0x0030
 323 #define BITS_PARITY_SPACE       0x0040
 324
 325 #define BITS_STOP_MASK          0x000f
 326 #define BITS_STOP_1             0x0000
 327 #define BITS_STOP_1_5           0x0001
 328 #define BITS_STOP_2             0x0002
 329
 330 /* CP210X_SET_BREAK */
 331 #define BREAK_ON                0x0001
 332 #define BREAK_OFF               0x0000
 333
 334 /* CP210X_(SET_MHS|GET_MDMSTS) */
 335 #define CONTROL_DTR             0x0001
 336 #define CONTROL_RTS             0x0002
 337 #define CONTROL_CTS             0x0010
 338 #define CONTROL_DSR             0x0020
 339 #define CONTROL_RING            0x0040
 340 #define CONTROL_DCD             0x0080
 341 #define CONTROL_WRITE_DTR       0x0100
 342 #define CONTROL_WRITE_RTS       0x0200
 343
 344 /* CP210X_VENDOR_SPECIFIC values */
 345 #define CP210X_READ_LATCH       0x00C2
 346 #define CP210X_GET_PARTNUM      0x370B
 347 #define CP210X_GET_PORTCONFIG   0x370C
 348 #define CP210X_GET_DEVICEMODE   0x3711
 349 #define CP210X_WRITE_LATCH      0x37E1
 350
 351 /* Part number definitions */
 352 #define CP210X_PARTNUM_CP2101   0x01
 353 #define CP210X_PARTNUM_CP2102   0x02
 354 #define CP210X_PARTNUM_CP2103   0x03
 355 #define CP210X_PARTNUM_CP2104   0x04
 356 #define CP210X_PARTNUM_CP2105   0x05
 357 #define CP210X_PARTNUM_CP2108   0x08
 358 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 359 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 360 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 361 #define CP210X_PARTNUM_UNKNOWN  0xFF
 362
 363 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 364 struct cp210x_comm_status {
 365         __le32   ulErrors;
 366         __le32   ulHoldReasons;
 367         __le32   ulAmountInInQueue;
 368         __le32   ulAmountInOutQueue;
 369         u8       bEofReceived;
 370         u8       bWaitForImmediate;
 371         u8       bReserved;
 372 } __packed;
 373
 374 /*
 375  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 376  * SiLabs app note AN571 gives a strange description of the 4 bits:
 377  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 378  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 379  */
 380 #define PURGE_ALL               0x000f
 381
 382 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 383 struct cp210x_flow_ctl {
 384         __le32  ulControlHandshake;
 385         __le32  ulFlowReplace;
 386         __le32  ulXonLimit;
 387         __le32  ulXoffLimit;
 388 } __packed;
 389
 390 /* cp210x_flow_ctl::ulControlHandshake */
 391 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 392 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 393 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 394 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 395 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 396 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 397
 398 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 399 #define CP210X_SERIAL_DTR_INACTIVE      0
 400 #define CP210X_SERIAL_DTR_ACTIVE        1
 401 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 402
 403 /* cp210x_flow_ctl::ulFlowReplace */
 404 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 405 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 406 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 407 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 408 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 409 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 410 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 411 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 412
 413 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 414 #define CP210X_SERIAL_RTS_INACTIVE      0
 415 #define CP210X_SERIAL_RTS_ACTIVE        1
 416 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 417
 418 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 419 struct cp210x_pin_mode {
 420         u8      eci;
 421         u8      sci;
 422 } __packed;
 423
 424 #define CP210X_PIN_MODE_MODEM           0
 425 #define CP210X_PIN_MODE_GPIO            BIT(0)
 426
 427 /*
 428  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 429  * Structure needs padding due to unused/unspecified bytes.
 430  */
 431 struct cp210x_config {
 432         __le16  gpio_mode;
 433         u8      __pad0[2];
 434         __le16  reset_state;
 435         u8      __pad1[4];
 436         __le16  suspend_state;
 437         u8      sci_cfg;
 438         u8      eci_cfg;
 439         u8      device_cfg;
 440 } __packed;
 441
 442 /* GPIO modes */
 443 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 444 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 445
 446 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 447 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 448
 449 /* CP2105 port configuration values */
 450 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 451 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 452 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 453
 454 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 455 struct cp210x_gpio_write {
 456         u8      mask;
 457         u8      state;
 458 } __packed;
 459
 460 static bool cp210x_is_cp2102n(struct usb_serial *serial)
 461 {
 462         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
 463
 464         return  (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) ||
 465                 (priv->partnum == CP210X_PARTNUM_CP2102N_QFN24) ||
 466                 (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20);
 467 }
 468
 469 /*
 470  * Helper to get interface number when we only have struct usb_serial.
 471  */
 472 static u8 cp210x_interface_num(struct usb_serial *serial)
 473 {
 474         struct usb_host_interface *cur_altsetting;
 475
 476         cur_altsetting = serial->interface->cur_altsetting;
 477
 478         return cur_altsetting->desc.bInterfaceNumber;
 479 }
 480
 481 /*
 482  * Reads a variable-sized block of CP210X_ registers, identified by req.
 483  * Returns data into buf in native USB byte order.
 484  */
 485 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 486                 void *buf, int bufsize)
 487 {
 488         struct usb_serial *serial = port->serial;
 489         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 490         void *dmabuf;
 491         int result;
 492
 493         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 494         if (!dmabuf) {
 495                 /*
 496                  * FIXME Some callers don't bother to check for error,
 497                  * at least give them consistent junk until they are fixed
 498                  */
 499                 memset(buf, 0, bufsize);
 500                 return -ENOMEM;
 501         }
 502
 503         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 504                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 505                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 506                         USB_CTRL_SET_TIMEOUT);
 507         if (result == bufsize) {
 508                 memcpy(buf, dmabuf, bufsize);
 509                 result = 0;
 510         } else {
 511                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 512                                 req, bufsize, result);
 513                 if (result >= 0)
 514                         result = -EIO;
 515
 516                 /*
 517                  * FIXME Some callers don't bother to check for error,
 518                  * at least give them consistent junk until they are fixed
 519                  */
 520                 memset(buf, 0, bufsize);
 521         }
 522
 523         kfree(dmabuf);
 524
 525         return result;
 526 }
 527
 528 /*
 529  * Reads any 32-bit CP210X_ register identified by req.
 530  */
 531 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 532 {
 533         __le32 le32_val;
 534         int err;
 535
 536         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 537         if (err) {
 538                 /*
 539                  * FIXME Some callers don't bother to check for error,
 540                  * at least give them consistent junk until they are fixed
 541                  */
 542                 *val = 0;
 543                 return err;
 544         }
 545
 546         *val = le32_to_cpu(le32_val);
 547
 548         return 0;
 549 }
 550
 551 /*
 552  * Reads any 16-bit CP210X_ register identified by req.
 553  */
 554 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 555 {
 556         __le16 le16_val;
 557         int err;
 558
 559         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 560         if (err)
 561                 return err;
 562
 563         *val = le16_to_cpu(le16_val);
 564
 565         return 0;
 566 }
 567
 568 /*
 569  * Reads any 8-bit CP210X_ register identified by req.
 570  */
 571 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 572 {
 573         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 574 }
 575
 576 /*
 577  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 578  * Returns data into buf in native USB byte order.
 579  */
 580 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 581                                     void *buf, int bufsize)
 582 {
 583         void *dmabuf;
 584         int result;
 585
 586         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 587         if (!dmabuf)
 588                 return -ENOMEM;
 589
 590         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 591                                  CP210X_VENDOR_SPECIFIC, type, val,
 592                                  cp210x_interface_num(serial), dmabuf, bufsize,
 593                                  USB_CTRL_GET_TIMEOUT);
 594         if (result == bufsize) {
 595                 memcpy(buf, dmabuf, bufsize);
 596                 result = 0;
 597         } else {
 598                 dev_err(&serial->interface->dev,
 599                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 600                         bufsize, result);
 601                 if (result >= 0)
 602                         result = -EIO;
 603         }
 604
 605         kfree(dmabuf);
 606
 607         return result;
 608 }
 609
 610 /*
 611  * Writes any 16-bit CP210X_ register (req) whose value is passed
 612  * entirely in the wValue field of the USB request.
 613  */
 614 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 615 {
 616         struct usb_serial *serial = port->serial;
 617         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 618         int result;
 619
 620         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 621                         req, REQTYPE_HOST_TO_INTERFACE, val,
 622                         port_priv->bInterfaceNumber, NULL, 0,
 623                         USB_CTRL_SET_TIMEOUT);
 624         if (result < 0) {
 625                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 626                                 req, result);
 627         }
 628
 629         return result;
 630 }
 631
 632 /*
 633  * Writes a variable-sized block of CP210X_ registers, identified by req.
 634  * Data in buf must be in native USB byte order.
 635  */
 636 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 637                 void *buf, int bufsize)
 638 {
 639         struct usb_serial *serial = port->serial;
 640         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 641         void *dmabuf;
 642         int result;
 643
 644         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 645         if (!dmabuf)
 646                 return -ENOMEM;
 647
 648         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 649                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 650                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 651                         USB_CTRL_SET_TIMEOUT);
 652
 653         kfree(dmabuf);
 654
 655         if (result == bufsize) {
 656                 result = 0;
 657         } else {
 658                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 659                                 req, bufsize, result);
 660                 if (result >= 0)
 661                         result = -EIO;
 662         }
 663
 664         return result;
 665 }
 666
 667 /*
 668  * Writes any 32-bit CP210X_ register identified by req.
 669  */
 670 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 671 {
 672         __le32 le32_val;
 673
 674         le32_val = cpu_to_le32(val);
 675
 676         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 677 }
 678
 679 #ifdef CONFIG_GPIOLIB
 680 /*
 681  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 682  * Data in buf must be in native USB byte order.
 683  */
 684 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 685                                      u16 val, void *buf, int bufsize)
 686 {
 687         void *dmabuf;
 688         int result;
 689
 690         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 691         if (!dmabuf)
 692                 return -ENOMEM;
 693
 694         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 695                                  CP210X_VENDOR_SPECIFIC, type, val,
 696                                  cp210x_interface_num(serial), dmabuf, bufsize,
 697                                  USB_CTRL_SET_TIMEOUT);
 698
 699         kfree(dmabuf);
 700
 701         if (result == bufsize) {
 702                 result = 0;
 703         } else {
 704                 dev_err(&serial->interface->dev,
 705                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 706                         bufsize, result);
 707                 if (result >= 0)
 708                         result = -EIO;
 709         }
 710
 711         return result;
 712 }
 713 #endif
 714
 715 /*
 716  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 717  * Write a known good value 0x800, read it back.
 718  * If it comes back swapped the bug is detected.
 719  * Preserve the original register value.
 720  */
 721 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 722 {
 723         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 724         u16 line_ctl_save;
 725         u16 line_ctl_test;
 726         int err;
 727
 728         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 729         if (err)
 730                 return err;
 731
 732         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 733         if (err)
 734                 return err;
 735
 736         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 737         if (err)
 738                 return err;
 739
 740         if (line_ctl_test == 8) {
 741                 port_priv->has_swapped_line_ctl = true;
 742                 line_ctl_save = swab16(line_ctl_save);
 743         }
 744
 745         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 746 }
 747
 748 /*
 749  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 750  * to workaround cp2108 bug and get correct value.
 751  */
 752 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 753 {
 754         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 755         int err;
 756
 757         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 758         if (err)
 759                 return err;
 760
 761         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 762         if (port_priv->has_swapped_line_ctl)
 763                 *ctl = swab16(*ctl);
 764
 765         return 0;
 766 }
 767
 768 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 769 {
 770         int result;
 771
 772         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 773         if (result) {
 774                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 775                 return result;
 776         }
 777
 778         /* Configure the termios structure */
 779         cp210x_get_termios(tty, port);
 780
 781         /* The baud rate must be initialised on cp2104 */
 782         if (tty)
 783                 cp210x_change_speed(tty, port, NULL);
 784
 785         return usb_serial_generic_open(tty, port);
 786 }
 787
 788 static void cp210x_close(struct usb_serial_port *port)
 789 {
 790         usb_serial_generic_close(port);
 791
 792         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 793         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 794
 795         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 796 }
 797
 798 /*
 799  * Read how many bytes are waiting in the TX queue.
 800  */
 801 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 802                 u32 *count)
 803 {
 804         struct usb_serial *serial = port->serial;
 805         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 806         struct cp210x_comm_status *sts;
 807         int result;
 808
 809         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 810         if (!sts)
 811                 return -ENOMEM;
 812
 813         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 814                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 815                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 816                         USB_CTRL_GET_TIMEOUT);
 817         if (result == sizeof(*sts)) {
 818                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 819                 result = 0;
 820         } else {
 821                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 822                 if (result >= 0)
 823                         result = -EIO;
 824         }
 825
 826         kfree(sts);
 827
 828         return result;
 829 }
 830
 831 static bool cp210x_tx_empty(struct usb_serial_port *port)
 832 {
 833         int err;
 834         u32 count;
 835
 836         err = cp210x_get_tx_queue_byte_count(port, &count);
 837         if (err)
 838                 return true;
 839
 840         return !count;
 841 }
 842
 843 /*
 844  * cp210x_get_termios
 845  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 846  * from the device, corrects any unsupported values, and configures the
 847  * termios structure to reflect the state of the device
 848  */
 849 static void cp210x_get_termios(struct tty_struct *tty,
 850         struct usb_serial_port *port)
 851 {
 852         unsigned int baud;
 853
 854         if (tty) {
 855                 cp210x_get_termios_port(tty->driver_data,
 856                         &tty->termios.c_cflag, &baud);
 857                 tty_encode_baud_rate(tty, baud, baud);
 858         } else {
 859                 tcflag_t cflag;
 860                 cflag = 0;
 861                 cp210x_get_termios_port(port, &cflag, &baud);
 862         }
 863 }
 864
 865 /*
 866  * cp210x_get_termios_port
 867  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 868  */
 869 static void cp210x_get_termios_port(struct usb_serial_port *port,
 870         tcflag_t *cflagp, unsigned int *baudp)
 871 {
 872         struct device *dev = &port->dev;
 873         tcflag_t cflag;
 874         struct cp210x_flow_ctl flow_ctl;
 875         u32 baud;
 876         u16 bits;
 877         u32 ctl_hs;
 878
 879         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 880
 881         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 882         *baudp = baud;
 883
 884         cflag = *cflagp;
 885
 886         cp210x_get_line_ctl(port, &bits);
 887         cflag &= ~CSIZE;
 888         switch (bits & BITS_DATA_MASK) {
 889         case BITS_DATA_5:
 890                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 891                 cflag |= CS5;
 892                 break;
 893         case BITS_DATA_6:
 894                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 895                 cflag |= CS6;
 896                 break;
 897         case BITS_DATA_7:
 898                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 899                 cflag |= CS7;
 900                 break;
 901         case BITS_DATA_8:
 902                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 903                 cflag |= CS8;
 904                 break;
 905         case BITS_DATA_9:
 906                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 907                 cflag |= CS8;
 908                 bits &= ~BITS_DATA_MASK;
 909                 bits |= BITS_DATA_8;
 910                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 911                 break;
 912         default:
 913                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 914                 cflag |= CS8;
 915                 bits &= ~BITS_DATA_MASK;
 916                 bits |= BITS_DATA_8;
 917                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 918                 break;
 919         }
 920
 921         switch (bits & BITS_PARITY_MASK) {
 922         case BITS_PARITY_NONE:
 923                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 924                 cflag &= ~PARENB;
 925                 break;
 926         case BITS_PARITY_ODD:
 927                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 928                 cflag |= (PARENB|PARODD);
 929                 break;
 930         case BITS_PARITY_EVEN:
 931                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 932                 cflag &= ~PARODD;
 933                 cflag |= PARENB;
 934                 break;
 935         case BITS_PARITY_MARK:
 936                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 937                 cflag |= (PARENB|PARODD|CMSPAR);
 938                 break;
 939         case BITS_PARITY_SPACE:
 940                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 941                 cflag &= ~PARODD;
 942                 cflag |= (PARENB|CMSPAR);
 943                 break;
 944         default:
 945                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 946                 cflag &= ~PARENB;
 947                 bits &= ~BITS_PARITY_MASK;
 948                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 949                 break;
 950         }
 951
 952         cflag &= ~CSTOPB;
 953         switch (bits & BITS_STOP_MASK) {
 954         case BITS_STOP_1:
 955                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 956                 break;
 957         case BITS_STOP_1_5:
 958                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 959                 bits &= ~BITS_STOP_MASK;
 960                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 961                 break;
 962         case BITS_STOP_2:
 963                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 964                 cflag |= CSTOPB;
 965                 break;
 966         default:
 967                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 968                 bits &= ~BITS_STOP_MASK;
 969                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 970                 break;
 971         }
 972
 973         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 974                         sizeof(flow_ctl));
 975         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 976         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
 977                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 978                 cflag |= CRTSCTS;
 979         } else {
 980                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 981                 cflag &= ~CRTSCTS;
 982         }
 983
 984         *cflagp = cflag;
 985 }
 986
 987 struct cp210x_rate {
 988         speed_t rate;
 989         speed_t high;
 990 };
 991
 992 static const struct cp210x_rate cp210x_an205_table1[] = {
 993         { 300, 300 },
 994         { 600, 600 },
 995         { 1200, 1200 },
 996         { 1800, 1800 },
 997         { 2400, 2400 },
 998         { 4000, 4000 },
 999         { 4800, 4803 },
1000         { 7200, 7207 },
1001         { 9600, 9612 },
1002         { 14400, 14428 },
1003         { 16000, 16062 },
1004         { 19200, 19250 },
1005         { 28800, 28912 },
1006         { 38400, 38601 },
1007         { 51200, 51558 },
1008         { 56000, 56280 },
1009         { 57600, 58053 },
1010         { 64000, 64111 },
1011         { 76800, 77608 },
1012         { 115200, 117028 },
1013         { 128000, 129347 },
1014         { 153600, 156868 },
1015         { 230400, 237832 },
1016         { 250000, 254234 },
1017         { 256000, 273066 },
1018         { 460800, 491520 },
1019         { 500000, 567138 },
1020         { 576000, 670254 },
1021         { 921600, UINT_MAX }
1022 };
1023
1024 /*
1025  * Quantises the baud rate as per AN205 Table 1
1026  */
1027 static speed_t cp210x_get_an205_rate(speed_t baud)
1028 {
1029         int i;
1030
1031         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1032                 if (baud <= cp210x_an205_table1[i].high)
1033                         break;
1034         }
1035
1036         return cp210x_an205_table1[i].rate;
1037 }
1038
1039 /*
1040  * CP2101 supports the following baud rates:
1041  *
1042  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1043  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1044  *
1045  * CP2102 and CP2103 support the following additional rates:
1046  *
1047  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1048  *      576000
1049  *
1050  * The device will map a requested rate to a supported one, but the result
1051  * of requests for rates greater than 1053257 is undefined (see AN205).
1052  *
1053  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1054  * respectively, with an error less than 1%. The actual rates are determined
1055  * by
1056  *
1057  *      div = round(freq / (2 x prescale x request))
1058  *      actual = freq / (2 x prescale x div)
1059  *
1060  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1061  * or 1 otherwise.
1062  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1063  * otherwise.
1064  */
1065 static void cp210x_change_speed(struct tty_struct *tty,
1066                 struct usb_serial_port *port, struct ktermios *old_termios)
1067 {
1068         struct usb_serial *serial = port->serial;
1069         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1070         u32 baud;
1071
1072         baud = tty->termios.c_ospeed;
1073
1074         /*
1075          * This maps the requested rate to the actual rate on cp2102n, a valid
1076          * rate on cp2102 or cp2103, or to an arbitrary rate in
1077          * [1M, max_speed].
1078          *
1079          * NOTE: B0 is not implemented.
1080          */
1081         if (cp210x_is_cp2102n(serial)) {
1082                 int clk_div;
1083                 int prescaler;
1084
1085                 baud = clamp(baud, 300u, priv->max_speed);
1086                 prescaler = (baud <= 365) ? 4 : 1;
1087                 clk_div = DIV_ROUND_CLOSEST(48000000, 2 * prescaler * baud);
1088                 baud = 48000000 / (2 * prescaler * clk_div);
1089         } else if (baud < 1000000) {
1090                 baud = cp210x_get_an205_rate(baud);
1091         } else if (baud > priv->max_speed) {
1092                 baud = priv->max_speed;
1093         }
1094
1095         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1096         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1097                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1098                 if (old_termios)
1099                         baud = old_termios->c_ospeed;
1100                 else
1101                         baud = 9600;
1102         }
1103
1104         tty_encode_baud_rate(tty, baud, baud);
1105 }
1106
1107 static void cp210x_set_termios(struct tty_struct *tty,
1108                 struct usb_serial_port *port, struct ktermios *old_termios)
1109 {
1110         struct device *dev = &port->dev;
1111         unsigned int cflag, old_cflag;
1112         u16 bits;
1113
1114         cflag = tty->termios.c_cflag;
1115         old_cflag = old_termios->c_cflag;
1116
1117         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1118                 cp210x_change_speed(tty, port, old_termios);
1119
1120         /* If the number of data bits is to be updated */
1121         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1122                 cp210x_get_line_ctl(port, &bits);
1123                 bits &= ~BITS_DATA_MASK;
1124                 switch (cflag & CSIZE) {
1125                 case CS5:
1126                         bits |= BITS_DATA_5;
1127                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1128                         break;
1129                 case CS6:
1130                         bits |= BITS_DATA_6;
1131                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1132                         break;
1133                 case CS7:
1134                         bits |= BITS_DATA_7;
1135                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1136                         break;
1137                 case CS8:
1138                 default:
1139                         bits |= BITS_DATA_8;
1140                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1141                         break;
1142                 }
1143                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1144                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1145         }
1146
1147         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1148             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1149                 cp210x_get_line_ctl(port, &bits);
1150                 bits &= ~BITS_PARITY_MASK;
1151                 if (cflag & PARENB) {
1152                         if (cflag & CMSPAR) {
1153                                 if (cflag & PARODD) {
1154                                         bits |= BITS_PARITY_MARK;
1155                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1156                                 } else {
1157                                         bits |= BITS_PARITY_SPACE;
1158                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1159                                 }
1160                         } else {
1161                                 if (cflag & PARODD) {
1162                                         bits |= BITS_PARITY_ODD;
1163                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1164                                 } else {
1165                                         bits |= BITS_PARITY_EVEN;
1166                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1167                                 }
1168                         }
1169                 }
1170                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1171                         dev_dbg(dev, "Parity mode not supported by device\n");
1172         }
1173
1174         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1175                 cp210x_get_line_ctl(port, &bits);
1176                 bits &= ~BITS_STOP_MASK;
1177                 if (cflag & CSTOPB) {
1178                         bits |= BITS_STOP_2;
1179                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1180                 } else {
1181                         bits |= BITS_STOP_1;
1182                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1183                 }
1184                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1185                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1186         }
1187
1188         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1189                 struct cp210x_flow_ctl flow_ctl;
1190                 u32 ctl_hs;
1191                 u32 flow_repl;
1192
1193                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1194                                 sizeof(flow_ctl));
1195                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1196                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1197                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1198                                 __func__, ctl_hs, flow_repl);
1199
1200                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1201                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1202                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1203                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1204                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1205                 if (cflag & CRTSCTS) {
1206                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1207
1208                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1209                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1210                                         CP210X_SERIAL_RTS_FLOW_CTL);
1211                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1212                 } else {
1213                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1214
1215                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1216                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1217                                         CP210X_SERIAL_RTS_ACTIVE);
1218                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1219                 }
1220
1221                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1222                                 __func__, ctl_hs, flow_repl);
1223                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1224                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1225                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1226                                 sizeof(flow_ctl));
1227         }
1228
1229 }
1230
1231 static int cp210x_tiocmset(struct tty_struct *tty,
1232                 unsigned int set, unsigned int clear)
1233 {
1234         struct usb_serial_port *port = tty->driver_data;
1235         return cp210x_tiocmset_port(port, set, clear);
1236 }
1237
1238 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1239                 unsigned int set, unsigned int clear)
1240 {
1241         u16 control = 0;
1242
1243         if (set & TIOCM_RTS) {
1244                 control |= CONTROL_RTS;
1245                 control |= CONTROL_WRITE_RTS;
1246         }
1247         if (set & TIOCM_DTR) {
1248                 control |= CONTROL_DTR;
1249                 control |= CONTROL_WRITE_DTR;
1250         }
1251         if (clear & TIOCM_RTS) {
1252                 control &= ~CONTROL_RTS;
1253                 control |= CONTROL_WRITE_RTS;
1254         }
1255         if (clear & TIOCM_DTR) {
1256                 control &= ~CONTROL_DTR;
1257                 control |= CONTROL_WRITE_DTR;
1258         }
1259
1260         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1261
1262         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1263 }
1264
1265 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1266 {
1267         if (on)
1268                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1269         else
1270                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1271 }
1272
1273 static int cp210x_tiocmget(struct tty_struct *tty)
1274 {
1275         struct usb_serial_port *port = tty->driver_data;
1276         u8 control;
1277         int result;
1278
1279         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1280         if (result)
1281                 return result;
1282
1283         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1284                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1285                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1286                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1287                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1288                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1289
1290         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1291
1292         return result;
1293 }
1294
1295 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1296 {
1297         struct usb_serial_port *port = tty->driver_data;
1298         u16 state;
1299
1300         if (break_state == 0)
1301                 state = BREAK_OFF;
1302         else
1303                 state = BREAK_ON;
1304         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1305                 state == BREAK_OFF ? "off" : "on");
1306         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1307 }
1308
1309 #ifdef CONFIG_GPIOLIB
1310 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1311 {
1312         struct usb_serial *serial = gpiochip_get_data(gc);
1313         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1314
1315         switch (offset) {
1316         case 0:
1317                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1318                         return -ENODEV;
1319                 break;
1320         case 1:
1321                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1322                                     CP2105_GPIO1_RS485_MODE))
1323                         return -ENODEV;
1324                 break;
1325         }
1326
1327         return 0;
1328 }
1329
1330 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1331 {
1332         struct usb_serial *serial = gpiochip_get_data(gc);
1333         int result;
1334         u8 buf;
1335
1336         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1337                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1338         if (result < 0)
1339                 return result;
1340
1341         return !!(buf & BIT(gpio));
1342 }
1343
1344 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1345 {
1346         struct usb_serial *serial = gpiochip_get_data(gc);
1347         struct cp210x_gpio_write buf;
1348
1349         if (value == 1)
1350                 buf.state = BIT(gpio);
1351         else
1352                 buf.state = 0;
1353
1354         buf.mask = BIT(gpio);
1355
1356         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1357                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1358 }
1359
1360 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1361 {
1362         /* Hardware does not support an input mode */
1363         return 0;
1364 }
1365
1366 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1367 {
1368         /* Hardware does not support an input mode */
1369         return -ENOTSUPP;
1370 }
1371
1372 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1373                                         int value)
1374 {
1375         return 0;
1376 }
1377
1378 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1379                                   unsigned long config)
1380 {
1381         struct usb_serial *serial = gpiochip_get_data(gc);
1382         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1383         enum pin_config_param param = pinconf_to_config_param(config);
1384
1385         /* Succeed only if in correct mode (this can't be set at runtime) */
1386         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1387             (priv->gpio_mode & BIT(gpio)))
1388                 return 0;
1389
1390         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1391             !(priv->gpio_mode & BIT(gpio)))
1392                 return 0;
1393
1394         return -ENOTSUPP;
1395 }
1396
1397 /*
1398  * This function is for configuring GPIO using shared pins, where other signals
1399  * are made unavailable by configuring the use of GPIO. This is believed to be
1400  * only applicable to the cp2105 at this point, the other devices supported by
1401  * this driver that provide GPIO do so in a way that does not impact other
1402  * signals and are thus expected to have very different initialisation.
1403  */
1404 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1405 {
1406         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1407         struct cp210x_pin_mode mode;
1408         struct cp210x_config config;
1409         u8 intf_num = cp210x_interface_num(serial);
1410         int result;
1411
1412         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1413                                           CP210X_GET_DEVICEMODE, &mode,
1414                                           sizeof(mode));
1415         if (result < 0)
1416                 return result;
1417
1418         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1419                                           CP210X_GET_PORTCONFIG, &config,
1420                                           sizeof(config));
1421         if (result < 0)
1422                 return result;
1423
1424         /*  2 banks of GPIO - One for the pins taken from each serial port */
1425         if (intf_num == 0) {
1426                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1427                         return 0;
1428
1429                 priv->config = config.eci_cfg;
1430                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1431                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1432                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1433                 priv->gc.ngpio = 2;
1434         } else if (intf_num == 1) {
1435                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1436                         return 0;
1437
1438                 priv->config = config.sci_cfg;
1439                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1440                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1441                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1442                 priv->gc.ngpio = 3;
1443         } else {
1444                 return -ENODEV;
1445         }
1446
1447         priv->gc.label = "cp210x";
1448         priv->gc.request = cp210x_gpio_request;
1449         priv->gc.get_direction = cp210x_gpio_direction_get;
1450         priv->gc.direction_input = cp210x_gpio_direction_input;
1451         priv->gc.direction_output = cp210x_gpio_direction_output;
1452         priv->gc.get = cp210x_gpio_get;
1453         priv->gc.set = cp210x_gpio_set;
1454         priv->gc.set_config = cp210x_gpio_set_config;
1455         priv->gc.owner = THIS_MODULE;
1456         priv->gc.parent = &serial->interface->dev;
1457         priv->gc.base = -1;
1458         priv->gc.can_sleep = true;
1459
1460         result = gpiochip_add_data(&priv->gc, serial);
1461         if (!result)
1462                 priv->gpio_registered = true;
1463
1464         return result;
1465 }
1466
1467 static void cp210x_gpio_remove(struct usb_serial *serial)
1468 {
1469         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1470
1471         if (priv->gpio_registered) {
1472                 gpiochip_remove(&priv->gc);
1473                 priv->gpio_registered = false;
1474         }
1475 }
1476
1477 #else
1478
1479 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1480 {
1481         return 0;
1482 }
1483
1484 static void cp210x_gpio_remove(struct usb_serial *serial)
1485 {
1486         /* Nothing to do */
1487 }
1488
1489 #endif
1490
1491 static int cp210x_port_probe(struct usb_serial_port *port)
1492 {
1493         struct usb_serial *serial = port->serial;
1494         struct cp210x_port_private *port_priv;
1495         int ret;
1496
1497         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1498         if (!port_priv)
1499                 return -ENOMEM;
1500
1501         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1502
1503         usb_set_serial_port_data(port, port_priv);
1504
1505         ret = cp210x_detect_swapped_line_ctl(port);
1506         if (ret) {
1507                 kfree(port_priv);
1508                 return ret;
1509         }
1510
1511         return 0;
1512 }
1513
1514 static int cp210x_port_remove(struct usb_serial_port *port)
1515 {
1516         struct cp210x_port_private *port_priv;
1517
1518         port_priv = usb_get_serial_port_data(port);
1519         kfree(port_priv);
1520
1521         return 0;
1522 }
1523
1524 static void cp210x_init_max_speed(struct usb_serial *serial)
1525 {
1526         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1527         speed_t max;
1528
1529         switch (priv->partnum) {
1530         case CP210X_PARTNUM_CP2101:
1531                 max = 921600;
1532                 break;
1533         case CP210X_PARTNUM_CP2102:
1534         case CP210X_PARTNUM_CP2103:
1535                 max = 1000000;
1536                 break;
1537         case CP210X_PARTNUM_CP2104:
1538         case CP210X_PARTNUM_CP2108:
1539                 max = 2000000;
1540                 break;
1541         case CP210X_PARTNUM_CP2105:
1542                 if (cp210x_interface_num(serial) == 0)
1543                         max = 2000000;  /* ECI */
1544                 else
1545                         max = 921600;   /* SCI */
1546                 break;
1547         case CP210X_PARTNUM_CP2102N_QFN28:
1548         case CP210X_PARTNUM_CP2102N_QFN24:
1549         case CP210X_PARTNUM_CP2102N_QFN20:
1550                 max = 3000000;
1551                 break;
1552         default:
1553                 max = 2000000;
1554                 break;
1555         }
1556
1557         priv->max_speed = max;
1558 }
1559
1560 static int cp210x_attach(struct usb_serial *serial)
1561 {
1562         int result;
1563         struct cp210x_serial_private *priv;
1564
1565         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1566         if (!priv)
1567                 return -ENOMEM;
1568
1569         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1570                                           CP210X_GET_PARTNUM, &priv->partnum,
1571                                           sizeof(priv->partnum));
1572         if (result < 0) {
1573                 dev_warn(&serial->interface->dev,
1574                          "querying part number failed\n");
1575                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1576         }
1577
1578         usb_set_serial_data(serial, priv);
1579
1580         cp210x_init_max_speed(serial);
1581
1582         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1583                 result = cp2105_shared_gpio_init(serial);
1584                 if (result < 0) {
1585                         dev_err(&serial->interface->dev,
1586                                 "GPIO initialisation failed, continuing without GPIO support\n");
1587                 }
1588         }
1589
1590         return 0;
1591 }
1592
1593 static void cp210x_disconnect(struct usb_serial *serial)
1594 {
1595         cp210x_gpio_remove(serial);
1596 }
1597
1598 static void cp210x_release(struct usb_serial *serial)
1599 {
1600         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1601
1602         cp210x_gpio_remove(serial);
1603
1604         kfree(priv);
1605 }
1606
1607 module_usb_serial_driver(serial_drivers, id_table);
1608
1609 MODULE_DESCRIPTION(DRIVER_DESC);
1610 MODULE_LICENSE("GPL v2");