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 static void cp210x_process_read_urb(struct urb *urb);
  54 static void cp210x_enable_event_mode(struct usb_serial_port *port);
  55 static void cp210x_disable_event_mode(struct usb_serial_port *port);
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
  59         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  60         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  61         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  63         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  64         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  65         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  66         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  67         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  68         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  69         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  70         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  71         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  72         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  73         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  74         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  75         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  76         { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
  77         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  78         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  79         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  80         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  81         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  82         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  83         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  84         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  85         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  86         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  87         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  88         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  89         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  90         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  91         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  92         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  93         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  94         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  95         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  96         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  97         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  98         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  99         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
 100         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
 101         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
 102         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
 103         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 104         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 105         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 106         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 107         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 108         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 109         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 110         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 111         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 112         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 113         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 114         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 115         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 116         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 117         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 118         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 119         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 120         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 121         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 122         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 123         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 124         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 125         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 126         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 127         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 128         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 129         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 130         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 131         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 132         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 133         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 134         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 135         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 136         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 137         { USB_DEVICE(0x10C4, 0x8414) }, /* Decagon USB Cable Adapter */
 138         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 139         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 140         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 141         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 142         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 143         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 144         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 145         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 146         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 147         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 148         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 149         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 150         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 151         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 152         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 153         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 154         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 155         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 156         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 157         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 158         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 159         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 160         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 161         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 162         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 163         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 164         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 165         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 166         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 167         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 168         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 169         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 170         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 171         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 172         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 173         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 174         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 175         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 176         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 177         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 178         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 179         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 180         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 181         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 182         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 183         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 184         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 185         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 186         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 187         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 188         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 189         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 190         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 191         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 192         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 193         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 194         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 195         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 196         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 197         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 198         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 199         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 200         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 201         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 202         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 203         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 204         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 205         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 206         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 207         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 208         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 209         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 210         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 211         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 212         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 213         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 214         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 215         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 216         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 217         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 218         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 219         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 220         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 221         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 222         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 223         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 224         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 225         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 226         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 227         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 228         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 229         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 230         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 231         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 232         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 233         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 234         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 235         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 236         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 237         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 238         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 239         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 240         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 241         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 242         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 243         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 244         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 245         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 246         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 247         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 248         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 249         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 250         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 251         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 252         { } /* Terminating Entry */
 253 };
 254
 255 MODULE_DEVICE_TABLE(usb, id_table);
 256
 257 struct cp210x_serial_private {
 258 #ifdef CONFIG_GPIOLIB
 259         struct gpio_chip        gc;
 260         bool                    gpio_registered;
 261         u8                      gpio_pushpull;
 262         u8                      gpio_altfunc;
 263         u8                      gpio_input;
 264 #endif
 265         u8                      partnum;
 266         speed_t                 min_speed;
 267         speed_t                 max_speed;
 268         bool                    use_actual_rate;
 269         bool                    no_event_mode;
 270 };
 271
 272 enum cp210x_event_state {
 273         ES_DATA,
 274         ES_ESCAPE,
 275         ES_LSR,
 276         ES_LSR_DATA_0,
 277         ES_LSR_DATA_1,
 278         ES_MSR
 279 };
 280
 281 struct cp210x_port_private {
 282         u8                      bInterfaceNumber;
 283         bool                    has_swapped_line_ctl;
 284         bool                    event_mode;
 285         enum cp210x_event_state event_state;
 286         u8 lsr;
 287 };
 288
 289 static struct usb_serial_driver cp210x_device = {
 290         .driver = {
 291                 .owner =        THIS_MODULE,
 292                 .name =         "cp210x",
 293         },
 294         .id_table               = id_table,
 295         .num_ports              = 1,
 296         .bulk_in_size           = 256,
 297         .bulk_out_size          = 256,
 298         .open                   = cp210x_open,
 299         .close                  = cp210x_close,
 300         .break_ctl              = cp210x_break_ctl,
 301         .set_termios            = cp210x_set_termios,
 302         .tx_empty               = cp210x_tx_empty,
 303         .throttle               = usb_serial_generic_throttle,
 304         .unthrottle             = usb_serial_generic_unthrottle,
 305         .tiocmget               = cp210x_tiocmget,
 306         .tiocmset               = cp210x_tiocmset,
 307         .get_icount             = usb_serial_generic_get_icount,
 308         .attach                 = cp210x_attach,
 309         .disconnect             = cp210x_disconnect,
 310         .release                = cp210x_release,
 311         .port_probe             = cp210x_port_probe,
 312         .port_remove            = cp210x_port_remove,
 313         .dtr_rts                = cp210x_dtr_rts,
 314         .process_read_urb       = cp210x_process_read_urb,
 315 };
 316
 317 static struct usb_serial_driver * const serial_drivers[] = {
 318         &cp210x_device, NULL
 319 };
 320
 321 /* Config request types */
 322 #define REQTYPE_HOST_TO_INTERFACE       0x41
 323 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 324 #define REQTYPE_HOST_TO_DEVICE  0x40
 325 #define REQTYPE_DEVICE_TO_HOST  0xc0
 326
 327 /* Config request codes */
 328 #define CP210X_IFC_ENABLE       0x00
 329 #define CP210X_SET_BAUDDIV      0x01
 330 #define CP210X_GET_BAUDDIV      0x02
 331 #define CP210X_SET_LINE_CTL     0x03
 332 #define CP210X_GET_LINE_CTL     0x04
 333 #define CP210X_SET_BREAK        0x05
 334 #define CP210X_IMM_CHAR         0x06
 335 #define CP210X_SET_MHS          0x07
 336 #define CP210X_GET_MDMSTS       0x08
 337 #define CP210X_SET_XON          0x09
 338 #define CP210X_SET_XOFF         0x0A
 339 #define CP210X_SET_EVENTMASK    0x0B
 340 #define CP210X_GET_EVENTMASK    0x0C
 341 #define CP210X_SET_CHAR         0x0D
 342 #define CP210X_GET_CHARS        0x0E
 343 #define CP210X_GET_PROPS        0x0F
 344 #define CP210X_GET_COMM_STATUS  0x10
 345 #define CP210X_RESET            0x11
 346 #define CP210X_PURGE            0x12
 347 #define CP210X_SET_FLOW         0x13
 348 #define CP210X_GET_FLOW         0x14
 349 #define CP210X_EMBED_EVENTS     0x15
 350 #define CP210X_GET_EVENTSTATE   0x16
 351 #define CP210X_SET_CHARS        0x19
 352 #define CP210X_GET_BAUDRATE     0x1D
 353 #define CP210X_SET_BAUDRATE     0x1E
 354 #define CP210X_VENDOR_SPECIFIC  0xFF
 355
 356 /* CP210X_IFC_ENABLE */
 357 #define UART_ENABLE             0x0001
 358 #define UART_DISABLE            0x0000
 359
 360 /* CP210X_(SET|GET)_BAUDDIV */
 361 #define BAUD_RATE_GEN_FREQ      0x384000
 362
 363 /* CP210X_(SET|GET)_LINE_CTL */
 364 #define BITS_DATA_MASK          0X0f00
 365 #define BITS_DATA_5             0X0500
 366 #define BITS_DATA_6             0X0600
 367 #define BITS_DATA_7             0X0700
 368 #define BITS_DATA_8             0X0800
 369 #define BITS_DATA_9             0X0900
 370
 371 #define BITS_PARITY_MASK        0x00f0
 372 #define BITS_PARITY_NONE        0x0000
 373 #define BITS_PARITY_ODD         0x0010
 374 #define BITS_PARITY_EVEN        0x0020
 375 #define BITS_PARITY_MARK        0x0030
 376 #define BITS_PARITY_SPACE       0x0040
 377
 378 #define BITS_STOP_MASK          0x000f
 379 #define BITS_STOP_1             0x0000
 380 #define BITS_STOP_1_5           0x0001
 381 #define BITS_STOP_2             0x0002
 382
 383 /* CP210X_SET_BREAK */
 384 #define BREAK_ON                0x0001
 385 #define BREAK_OFF               0x0000
 386
 387 /* CP210X_(SET_MHS|GET_MDMSTS) */
 388 #define CONTROL_DTR             0x0001
 389 #define CONTROL_RTS             0x0002
 390 #define CONTROL_CTS             0x0010
 391 #define CONTROL_DSR             0x0020
 392 #define CONTROL_RING            0x0040
 393 #define CONTROL_DCD             0x0080
 394 #define CONTROL_WRITE_DTR       0x0100
 395 #define CONTROL_WRITE_RTS       0x0200
 396
 397 /* CP210X_VENDOR_SPECIFIC values */
 398 #define CP210X_READ_2NCONFIG    0x000E
 399 #define CP210X_READ_LATCH       0x00C2
 400 #define CP210X_GET_PARTNUM      0x370B
 401 #define CP210X_GET_PORTCONFIG   0x370C
 402 #define CP210X_GET_DEVICEMODE   0x3711
 403 #define CP210X_WRITE_LATCH      0x37E1
 404
 405 /* Part number definitions */
 406 #define CP210X_PARTNUM_CP2101   0x01
 407 #define CP210X_PARTNUM_CP2102   0x02
 408 #define CP210X_PARTNUM_CP2103   0x03
 409 #define CP210X_PARTNUM_CP2104   0x04
 410 #define CP210X_PARTNUM_CP2105   0x05
 411 #define CP210X_PARTNUM_CP2108   0x08
 412 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 413 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 414 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 415 #define CP210X_PARTNUM_UNKNOWN  0xFF
 416
 417 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 418 struct cp210x_comm_status {
 419         __le32   ulErrors;
 420         __le32   ulHoldReasons;
 421         __le32   ulAmountInInQueue;
 422         __le32   ulAmountInOutQueue;
 423         u8       bEofReceived;
 424         u8       bWaitForImmediate;
 425         u8       bReserved;
 426 } __packed;
 427
 428 /*
 429  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 430  * SiLabs app note AN571 gives a strange description of the 4 bits:
 431  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 432  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 433  */
 434 #define PURGE_ALL               0x000f
 435
 436 /* CP210X_EMBED_EVENTS */
 437 #define CP210X_ESCCHAR          0xec
 438
 439 #define CP210X_LSR_OVERRUN      BIT(1)
 440 #define CP210X_LSR_PARITY       BIT(2)
 441 #define CP210X_LSR_FRAME        BIT(3)
 442 #define CP210X_LSR_BREAK        BIT(4)
 443
 444
 445 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 446 struct cp210x_flow_ctl {
 447         __le32  ulControlHandshake;
 448         __le32  ulFlowReplace;
 449         __le32  ulXonLimit;
 450         __le32  ulXoffLimit;
 451 };
 452
 453 /* cp210x_flow_ctl::ulControlHandshake */
 454 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 455 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 456 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 457 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 458 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 459 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 460
 461 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 462 #define CP210X_SERIAL_DTR_INACTIVE      0
 463 #define CP210X_SERIAL_DTR_ACTIVE        1
 464 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 465
 466 /* cp210x_flow_ctl::ulFlowReplace */
 467 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 468 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 469 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 470 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 471 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 472 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 473 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 474 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 475
 476 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 477 #define CP210X_SERIAL_RTS_INACTIVE      0
 478 #define CP210X_SERIAL_RTS_ACTIVE        1
 479 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 480
 481 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 482 struct cp210x_pin_mode {
 483         u8      eci;
 484         u8      sci;
 485 };
 486
 487 #define CP210X_PIN_MODE_MODEM           0
 488 #define CP210X_PIN_MODE_GPIO            BIT(0)
 489
 490 /*
 491  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 492  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 493  */
 494 struct cp210x_dual_port_config {
 495         __le16  gpio_mode;
 496         u8      __pad0[2];
 497         __le16  reset_state;
 498         u8      __pad1[4];
 499         __le16  suspend_state;
 500         u8      sci_cfg;
 501         u8      eci_cfg;
 502         u8      device_cfg;
 503 } __packed;
 504
 505 /*
 506  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 507  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 508  */
 509 struct cp210x_single_port_config {
 510         __le16  gpio_mode;
 511         u8      __pad0[2];
 512         __le16  reset_state;
 513         u8      __pad1[4];
 514         __le16  suspend_state;
 515         u8      device_cfg;
 516 } __packed;
 517
 518 /* GPIO modes */
 519 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 520 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 521
 522 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 523 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 524
 525 #define CP210X_GPIO_MODE_OFFSET         8
 526 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 527
 528 /* CP2105 port configuration values */
 529 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 530 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 531 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 532
 533 /* CP2104 port configuration values */
 534 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 535 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 536 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 537
 538 /* CP2102N configuration array indices */
 539 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 540 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 541 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 542 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 543
 544 /* CP2102N QFN20 port configuration values */
 545 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 546 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 547 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 548 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 549
 550 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 551 struct cp210x_gpio_write {
 552         u8      mask;
 553         u8      state;
 554 };
 555
 556 /*
 557  * Helper to get interface number when we only have struct usb_serial.
 558  */
 559 static u8 cp210x_interface_num(struct usb_serial *serial)
 560 {
 561         struct usb_host_interface *cur_altsetting;
 562
 563         cur_altsetting = serial->interface->cur_altsetting;
 564
 565         return cur_altsetting->desc.bInterfaceNumber;
 566 }
 567
 568 /*
 569  * Reads a variable-sized block of CP210X_ registers, identified by req.
 570  * Returns data into buf in native USB byte order.
 571  */
 572 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 573                 void *buf, int bufsize)
 574 {
 575         struct usb_serial *serial = port->serial;
 576         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 577         void *dmabuf;
 578         int result;
 579
 580         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 581         if (!dmabuf) {
 582                 /*
 583                  * FIXME Some callers don't bother to check for error,
 584                  * at least give them consistent junk until they are fixed
 585                  */
 586                 memset(buf, 0, bufsize);
 587                 return -ENOMEM;
 588         }
 589
 590         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 591                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 592                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 593                         USB_CTRL_SET_TIMEOUT);
 594         if (result == bufsize) {
 595                 memcpy(buf, dmabuf, bufsize);
 596                 result = 0;
 597         } else {
 598                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 599                                 req, bufsize, result);
 600                 if (result >= 0)
 601                         result = -EIO;
 602
 603                 /*
 604                  * FIXME Some callers don't bother to check for error,
 605                  * at least give them consistent junk until they are fixed
 606                  */
 607                 memset(buf, 0, bufsize);
 608         }
 609
 610         kfree(dmabuf);
 611
 612         return result;
 613 }
 614
 615 /*
 616  * Reads any 32-bit CP210X_ register identified by req.
 617  */
 618 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 619 {
 620         __le32 le32_val;
 621         int err;
 622
 623         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 624         if (err) {
 625                 /*
 626                  * FIXME Some callers don't bother to check for error,
 627                  * at least give them consistent junk until they are fixed
 628                  */
 629                 *val = 0;
 630                 return err;
 631         }
 632
 633         *val = le32_to_cpu(le32_val);
 634
 635         return 0;
 636 }
 637
 638 /*
 639  * Reads any 16-bit CP210X_ register identified by req.
 640  */
 641 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 642 {
 643         __le16 le16_val;
 644         int err;
 645
 646         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 647         if (err)
 648                 return err;
 649
 650         *val = le16_to_cpu(le16_val);
 651
 652         return 0;
 653 }
 654
 655 /*
 656  * Reads any 8-bit CP210X_ register identified by req.
 657  */
 658 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 659 {
 660         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 661 }
 662
 663 /*
 664  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 665  * Returns data into buf in native USB byte order.
 666  */
 667 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 668                                     void *buf, int bufsize)
 669 {
 670         void *dmabuf;
 671         int result;
 672
 673         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 674         if (!dmabuf)
 675                 return -ENOMEM;
 676
 677         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 678                                  CP210X_VENDOR_SPECIFIC, type, val,
 679                                  cp210x_interface_num(serial), dmabuf, bufsize,
 680                                  USB_CTRL_GET_TIMEOUT);
 681         if (result == bufsize) {
 682                 memcpy(buf, dmabuf, bufsize);
 683                 result = 0;
 684         } else {
 685                 dev_err(&serial->interface->dev,
 686                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 687                         bufsize, result);
 688                 if (result >= 0)
 689                         result = -EIO;
 690         }
 691
 692         kfree(dmabuf);
 693
 694         return result;
 695 }
 696
 697 /*
 698  * Writes any 16-bit CP210X_ register (req) whose value is passed
 699  * entirely in the wValue field of the USB request.
 700  */
 701 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 702 {
 703         struct usb_serial *serial = port->serial;
 704         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 705         int result;
 706
 707         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 708                         req, REQTYPE_HOST_TO_INTERFACE, val,
 709                         port_priv->bInterfaceNumber, NULL, 0,
 710                         USB_CTRL_SET_TIMEOUT);
 711         if (result < 0) {
 712                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 713                                 req, result);
 714         }
 715
 716         return result;
 717 }
 718
 719 /*
 720  * Writes a variable-sized block of CP210X_ registers, identified by req.
 721  * Data in buf must be in native USB byte order.
 722  */
 723 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 724                 void *buf, int bufsize)
 725 {
 726         struct usb_serial *serial = port->serial;
 727         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 728         void *dmabuf;
 729         int result;
 730
 731         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 732         if (!dmabuf)
 733                 return -ENOMEM;
 734
 735         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 736                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 737                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 738                         USB_CTRL_SET_TIMEOUT);
 739
 740         kfree(dmabuf);
 741
 742         if (result == bufsize) {
 743                 result = 0;
 744         } else {
 745                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 746                                 req, bufsize, result);
 747                 if (result >= 0)
 748                         result = -EIO;
 749         }
 750
 751         return result;
 752 }
 753
 754 /*
 755  * Writes any 32-bit CP210X_ register identified by req.
 756  */
 757 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 758 {
 759         __le32 le32_val;
 760
 761         le32_val = cpu_to_le32(val);
 762
 763         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 764 }
 765
 766 #ifdef CONFIG_GPIOLIB
 767 /*
 768  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 769  * Data in buf must be in native USB byte order.
 770  */
 771 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 772                                      u16 val, void *buf, int bufsize)
 773 {
 774         void *dmabuf;
 775         int result;
 776
 777         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 778         if (!dmabuf)
 779                 return -ENOMEM;
 780
 781         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 782                                  CP210X_VENDOR_SPECIFIC, type, val,
 783                                  cp210x_interface_num(serial), dmabuf, bufsize,
 784                                  USB_CTRL_SET_TIMEOUT);
 785
 786         kfree(dmabuf);
 787
 788         if (result == bufsize) {
 789                 result = 0;
 790         } else {
 791                 dev_err(&serial->interface->dev,
 792                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 793                         bufsize, result);
 794                 if (result >= 0)
 795                         result = -EIO;
 796         }
 797
 798         return result;
 799 }
 800 #endif
 801
 802 /*
 803  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 804  * Write a known good value 0x800, read it back.
 805  * If it comes back swapped the bug is detected.
 806  * Preserve the original register value.
 807  */
 808 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 809 {
 810         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 811         u16 line_ctl_save;
 812         u16 line_ctl_test;
 813         int err;
 814
 815         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 816         if (err)
 817                 return err;
 818
 819         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 820         if (err)
 821                 return err;
 822
 823         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 824         if (err)
 825                 return err;
 826
 827         if (line_ctl_test == 8) {
 828                 port_priv->has_swapped_line_ctl = true;
 829                 line_ctl_save = swab16(line_ctl_save);
 830         }
 831
 832         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 833 }
 834
 835 /*
 836  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 837  * to workaround cp2108 bug and get correct value.
 838  */
 839 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 840 {
 841         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 842         int err;
 843
 844         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 845         if (err)
 846                 return err;
 847
 848         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 849         if (port_priv->has_swapped_line_ctl)
 850                 *ctl = swab16(*ctl);
 851
 852         return 0;
 853 }
 854
 855 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 856 {
 857         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 858         int result;
 859
 860         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 861         if (result) {
 862                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 863                 return result;
 864         }
 865
 866         /* Configure the termios structure */
 867         cp210x_get_termios(tty, port);
 868
 869         if (tty) {
 870                 /* The baud rate must be initialised on cp2104 */
 871                 cp210x_change_speed(tty, port, NULL);
 872
 873                 if (I_INPCK(tty))
 874                         cp210x_enable_event_mode(port);
 875         }
 876
 877         result = usb_serial_generic_open(tty, port);
 878         if (result)
 879                 goto err_disable;
 880
 881         return 0;
 882
 883 err_disable:
 884         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 885         port_priv->event_mode = false;
 886
 887         return result;
 888 }
 889
 890 static void cp210x_close(struct usb_serial_port *port)
 891 {
 892         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 893
 894         usb_serial_generic_close(port);
 895
 896         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 897         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 898
 899         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 900
 901         /* Disabling the interface disables event-insertion mode. */
 902         port_priv->event_mode = false;
 903 }
 904
 905 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 906 {
 907         if (lsr & CP210X_LSR_BREAK) {
 908                 port->icount.brk++;
 909                 *flag = TTY_BREAK;
 910         } else if (lsr & CP210X_LSR_PARITY) {
 911                 port->icount.parity++;
 912                 *flag = TTY_PARITY;
 913         } else if (lsr & CP210X_LSR_FRAME) {
 914                 port->icount.frame++;
 915                 *flag = TTY_FRAME;
 916         }
 917
 918         if (lsr & CP210X_LSR_OVERRUN) {
 919                 port->icount.overrun++;
 920                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 921         }
 922 }
 923
 924 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 925 {
 926         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 927
 928         switch (port_priv->event_state) {
 929         case ES_DATA:
 930                 if (*ch == CP210X_ESCCHAR) {
 931                         port_priv->event_state = ES_ESCAPE;
 932                         break;
 933                 }
 934                 return false;
 935         case ES_ESCAPE:
 936                 switch (*ch) {
 937                 case 0:
 938                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 939                         *ch = CP210X_ESCCHAR;
 940                         port_priv->event_state = ES_DATA;
 941                         return false;
 942                 case 1:
 943                         port_priv->event_state = ES_LSR_DATA_0;
 944                         break;
 945                 case 2:
 946                         port_priv->event_state = ES_LSR;
 947                         break;
 948                 case 3:
 949                         port_priv->event_state = ES_MSR;
 950                         break;
 951                 default:
 952                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 953                         port_priv->event_state = ES_DATA;
 954                         break;
 955                 }
 956                 break;
 957         case ES_LSR_DATA_0:
 958                 port_priv->lsr = *ch;
 959                 port_priv->event_state = ES_LSR_DATA_1;
 960                 break;
 961         case ES_LSR_DATA_1:
 962                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 963                                 __func__, port_priv->lsr, *ch);
 964                 cp210x_process_lsr(port, port_priv->lsr, flag);
 965                 port_priv->event_state = ES_DATA;
 966                 return false;
 967         case ES_LSR:
 968                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 969                 port_priv->lsr = *ch;
 970                 cp210x_process_lsr(port, port_priv->lsr, flag);
 971                 port_priv->event_state = ES_DATA;
 972                 break;
 973         case ES_MSR:
 974                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 975                 /* unimplemented */
 976                 port_priv->event_state = ES_DATA;
 977                 break;
 978         }
 979
 980         return true;
 981 }
 982
 983 static void cp210x_process_read_urb(struct urb *urb)
 984 {
 985         struct usb_serial_port *port = urb->context;
 986         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 987         unsigned char *ch = urb->transfer_buffer;
 988         char flag;
 989         int i;
 990
 991         if (!urb->actual_length)
 992                 return;
 993
 994         if (port_priv->event_mode) {
 995                 for (i = 0; i < urb->actual_length; i++, ch++) {
 996                         flag = TTY_NORMAL;
 997
 998                         if (cp210x_process_char(port, ch, &flag))
 999                                 continue;
1000
1001                         tty_insert_flip_char(&port->port, *ch, flag);
1002                 }
1003         } else {
1004                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
1005         }
1006         tty_flip_buffer_push(&port->port);
1007 }
1008
1009 /*
1010  * Read how many bytes are waiting in the TX queue.
1011  */
1012 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
1013                 u32 *count)
1014 {
1015         struct usb_serial *serial = port->serial;
1016         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1017         struct cp210x_comm_status *sts;
1018         int result;
1019
1020         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
1021         if (!sts)
1022                 return -ENOMEM;
1023
1024         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1025                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
1026                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
1027                         USB_CTRL_GET_TIMEOUT);
1028         if (result == sizeof(*sts)) {
1029                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
1030                 result = 0;
1031         } else {
1032                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
1033                 if (result >= 0)
1034                         result = -EIO;
1035         }
1036
1037         kfree(sts);
1038
1039         return result;
1040 }
1041
1042 static bool cp210x_tx_empty(struct usb_serial_port *port)
1043 {
1044         int err;
1045         u32 count;
1046
1047         err = cp210x_get_tx_queue_byte_count(port, &count);
1048         if (err)
1049                 return true;
1050
1051         return !count;
1052 }
1053
1054 /*
1055  * cp210x_get_termios
1056  * Reads the baud rate, data bits, parity, stop bits and flow control mode
1057  * from the device, corrects any unsupported values, and configures the
1058  * termios structure to reflect the state of the device
1059  */
1060 static void cp210x_get_termios(struct tty_struct *tty,
1061         struct usb_serial_port *port)
1062 {
1063         unsigned int baud;
1064
1065         if (tty) {
1066                 cp210x_get_termios_port(tty->driver_data,
1067                         &tty->termios.c_cflag, &baud);
1068                 tty_encode_baud_rate(tty, baud, baud);
1069         } else {
1070                 tcflag_t cflag;
1071                 cflag = 0;
1072                 cp210x_get_termios_port(port, &cflag, &baud);
1073         }
1074 }
1075
1076 /*
1077  * cp210x_get_termios_port
1078  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
1079  */
1080 static void cp210x_get_termios_port(struct usb_serial_port *port,
1081         tcflag_t *cflagp, unsigned int *baudp)
1082 {
1083         struct device *dev = &port->dev;
1084         tcflag_t cflag;
1085         struct cp210x_flow_ctl flow_ctl;
1086         u32 baud;
1087         u16 bits;
1088         u32 ctl_hs;
1089         u32 flow_repl;
1090
1091         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
1092
1093         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
1094         *baudp = baud;
1095
1096         cflag = *cflagp;
1097
1098         cp210x_get_line_ctl(port, &bits);
1099         cflag &= ~CSIZE;
1100         switch (bits & BITS_DATA_MASK) {
1101         case BITS_DATA_5:
1102                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
1103                 cflag |= CS5;
1104                 break;
1105         case BITS_DATA_6:
1106                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
1107                 cflag |= CS6;
1108                 break;
1109         case BITS_DATA_7:
1110                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
1111                 cflag |= CS7;
1112                 break;
1113         case BITS_DATA_8:
1114                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
1115                 cflag |= CS8;
1116                 break;
1117         case BITS_DATA_9:
1118                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
1119                 cflag |= CS8;
1120                 bits &= ~BITS_DATA_MASK;
1121                 bits |= BITS_DATA_8;
1122                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1123                 break;
1124         default:
1125                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
1126                 cflag |= CS8;
1127                 bits &= ~BITS_DATA_MASK;
1128                 bits |= BITS_DATA_8;
1129                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1130                 break;
1131         }
1132
1133         switch (bits & BITS_PARITY_MASK) {
1134         case BITS_PARITY_NONE:
1135                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
1136                 cflag &= ~PARENB;
1137                 break;
1138         case BITS_PARITY_ODD:
1139                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
1140                 cflag |= (PARENB|PARODD);
1141                 break;
1142         case BITS_PARITY_EVEN:
1143                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1144                 cflag &= ~PARODD;
1145                 cflag |= PARENB;
1146                 break;
1147         case BITS_PARITY_MARK:
1148                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
1149                 cflag |= (PARENB|PARODD|CMSPAR);
1150                 break;
1151         case BITS_PARITY_SPACE:
1152                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1153                 cflag &= ~PARODD;
1154                 cflag |= (PARENB|CMSPAR);
1155                 break;
1156         default:
1157                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
1158                 cflag &= ~PARENB;
1159                 bits &= ~BITS_PARITY_MASK;
1160                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1161                 break;
1162         }
1163
1164         cflag &= ~CSTOPB;
1165         switch (bits & BITS_STOP_MASK) {
1166         case BITS_STOP_1:
1167                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1168                 break;
1169         case BITS_STOP_1_5:
1170                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
1171                 bits &= ~BITS_STOP_MASK;
1172                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1173                 break;
1174         case BITS_STOP_2:
1175                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1176                 cflag |= CSTOPB;
1177                 break;
1178         default:
1179                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
1180                 bits &= ~BITS_STOP_MASK;
1181                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1182                 break;
1183         }
1184
1185         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1186                         sizeof(flow_ctl));
1187         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1188         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1189                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1190                 /*
1191                  * When the port is closed, the CP210x hardware disables
1192                  * auto-RTS and RTS is deasserted but it leaves auto-CTS when
1193                  * in hardware flow control mode. When re-opening the port, if
1194                  * auto-CTS is enabled on the cp210x, then auto-RTS must be
1195                  * re-enabled in the driver.
1196                  */
1197                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1198                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1199                 flow_repl |= CP210X_SERIAL_RTS_SHIFT(CP210X_SERIAL_RTS_FLOW_CTL);
1200                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1201                 cp210x_write_reg_block(port,
1202                                 CP210X_SET_FLOW,
1203                                 &flow_ctl,
1204                                 sizeof(flow_ctl));
1205
1206                 cflag |= CRTSCTS;
1207         } else {
1208                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1209                 cflag &= ~CRTSCTS;
1210         }
1211
1212         *cflagp = cflag;
1213 }
1214
1215 struct cp210x_rate {
1216         speed_t rate;
1217         speed_t high;
1218 };
1219
1220 static const struct cp210x_rate cp210x_an205_table1[] = {
1221         { 300, 300 },
1222         { 600, 600 },
1223         { 1200, 1200 },
1224         { 1800, 1800 },
1225         { 2400, 2400 },
1226         { 4000, 4000 },
1227         { 4800, 4803 },
1228         { 7200, 7207 },
1229         { 9600, 9612 },
1230         { 14400, 14428 },
1231         { 16000, 16062 },
1232         { 19200, 19250 },
1233         { 28800, 28912 },
1234         { 38400, 38601 },
1235         { 51200, 51558 },
1236         { 56000, 56280 },
1237         { 57600, 58053 },
1238         { 64000, 64111 },
1239         { 76800, 77608 },
1240         { 115200, 117028 },
1241         { 128000, 129347 },
1242         { 153600, 156868 },
1243         { 230400, 237832 },
1244         { 250000, 254234 },
1245         { 256000, 273066 },
1246         { 460800, 491520 },
1247         { 500000, 567138 },
1248         { 576000, 670254 },
1249         { 921600, UINT_MAX }
1250 };
1251
1252 /*
1253  * Quantises the baud rate as per AN205 Table 1
1254  */
1255 static speed_t cp210x_get_an205_rate(speed_t baud)
1256 {
1257         int i;
1258
1259         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
1260                 if (baud <= cp210x_an205_table1[i].high)
1261                         break;
1262         }
1263
1264         return cp210x_an205_table1[i].rate;
1265 }
1266
1267 static speed_t cp210x_get_actual_rate(speed_t baud)
1268 {
1269         unsigned int prescale = 1;
1270         unsigned int div;
1271
1272         if (baud <= 365)
1273                 prescale = 4;
1274
1275         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1276         baud = 48000000 / (2 * prescale * div);
1277
1278         return baud;
1279 }
1280
1281 /*
1282  * CP2101 supports the following baud rates:
1283  *
1284  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1285  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1286  *
1287  * CP2102 and CP2103 support the following additional rates:
1288  *
1289  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1290  *      576000
1291  *
1292  * The device will map a requested rate to a supported one, but the result
1293  * of requests for rates greater than 1053257 is undefined (see AN205).
1294  *
1295  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1296  * respectively, with an error less than 1%. The actual rates are determined
1297  * by
1298  *
1299  *      div = round(freq / (2 x prescale x request))
1300  *      actual = freq / (2 x prescale x div)
1301  *
1302  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1303  * or 1 otherwise.
1304  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1305  * otherwise.
1306  */
1307 static void cp210x_change_speed(struct tty_struct *tty,
1308                 struct usb_serial_port *port, struct ktermios *old_termios)
1309 {
1310         struct usb_serial *serial = port->serial;
1311         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1312         u32 baud;
1313
1314         /*
1315          * This maps the requested rate to the actual rate, a valid rate on
1316          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1317          *
1318          * NOTE: B0 is not implemented.
1319          */
1320         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1321
1322         if (priv->use_actual_rate)
1323                 baud = cp210x_get_actual_rate(baud);
1324         else if (baud < 1000000)
1325                 baud = cp210x_get_an205_rate(baud);
1326
1327         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1328         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1329                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1330                 if (old_termios)
1331                         baud = old_termios->c_ospeed;
1332                 else
1333                         baud = 9600;
1334         }
1335
1336         tty_encode_baud_rate(tty, baud, baud);
1337 }
1338
1339 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1340 {
1341         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1342         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1343         int ret;
1344
1345         if (port_priv->event_mode)
1346                 return;
1347
1348         if (priv->no_event_mode)
1349                 return;
1350
1351         port_priv->event_state = ES_DATA;
1352         port_priv->event_mode = true;
1353
1354         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1355         if (ret) {
1356                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1357                 port_priv->event_mode = false;
1358         }
1359 }
1360
1361 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1362 {
1363         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1364         int ret;
1365
1366         if (!port_priv->event_mode)
1367                 return;
1368
1369         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1370         if (ret) {
1371                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1372                 return;
1373         }
1374
1375         port_priv->event_mode = false;
1376 }
1377
1378 static void cp210x_set_termios(struct tty_struct *tty,
1379                 struct usb_serial_port *port, struct ktermios *old_termios)
1380 {
1381         struct device *dev = &port->dev;
1382         unsigned int cflag, old_cflag;
1383         u16 bits;
1384
1385         cflag = tty->termios.c_cflag;
1386         old_cflag = old_termios->c_cflag;
1387
1388         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1389                 cp210x_change_speed(tty, port, old_termios);
1390
1391         /* If the number of data bits is to be updated */
1392         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1393                 cp210x_get_line_ctl(port, &bits);
1394                 bits &= ~BITS_DATA_MASK;
1395                 switch (cflag & CSIZE) {
1396                 case CS5:
1397                         bits |= BITS_DATA_5;
1398                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1399                         break;
1400                 case CS6:
1401                         bits |= BITS_DATA_6;
1402                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1403                         break;
1404                 case CS7:
1405                         bits |= BITS_DATA_7;
1406                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1407                         break;
1408                 case CS8:
1409                 default:
1410                         bits |= BITS_DATA_8;
1411                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1412                         break;
1413                 }
1414                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1415                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1416         }
1417
1418         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1419             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1420                 cp210x_get_line_ctl(port, &bits);
1421                 bits &= ~BITS_PARITY_MASK;
1422                 if (cflag & PARENB) {
1423                         if (cflag & CMSPAR) {
1424                                 if (cflag & PARODD) {
1425                                         bits |= BITS_PARITY_MARK;
1426                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1427                                 } else {
1428                                         bits |= BITS_PARITY_SPACE;
1429                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1430                                 }
1431                         } else {
1432                                 if (cflag & PARODD) {
1433                                         bits |= BITS_PARITY_ODD;
1434                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1435                                 } else {
1436                                         bits |= BITS_PARITY_EVEN;
1437                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1438                                 }
1439                         }
1440                 }
1441                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1442                         dev_dbg(dev, "Parity mode not supported by device\n");
1443         }
1444
1445         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1446                 cp210x_get_line_ctl(port, &bits);
1447                 bits &= ~BITS_STOP_MASK;
1448                 if (cflag & CSTOPB) {
1449                         bits |= BITS_STOP_2;
1450                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1451                 } else {
1452                         bits |= BITS_STOP_1;
1453                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1454                 }
1455                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1456                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1457         }
1458
1459         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1460                 struct cp210x_flow_ctl flow_ctl;
1461                 u32 ctl_hs;
1462                 u32 flow_repl;
1463
1464                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1465                                 sizeof(flow_ctl));
1466                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1467                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1468                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1469                                 __func__, ctl_hs, flow_repl);
1470
1471                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1472                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1473                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1474                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1475                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1476                 if (cflag & CRTSCTS) {
1477                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1478
1479                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1480                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1481                                         CP210X_SERIAL_RTS_FLOW_CTL);
1482                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1483                 } else {
1484                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1485
1486                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1487                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1488                                         CP210X_SERIAL_RTS_ACTIVE);
1489                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1490                 }
1491
1492                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1493                                 __func__, ctl_hs, flow_repl);
1494                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1495                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1496                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1497                                 sizeof(flow_ctl));
1498         }
1499
1500         /*
1501          * Enable event-insertion mode only if input parity checking is
1502          * enabled for now.
1503          */
1504         if (I_INPCK(tty))
1505                 cp210x_enable_event_mode(port);
1506         else
1507                 cp210x_disable_event_mode(port);
1508 }
1509
1510 static int cp210x_tiocmset(struct tty_struct *tty,
1511                 unsigned int set, unsigned int clear)
1512 {
1513         struct usb_serial_port *port = tty->driver_data;
1514         return cp210x_tiocmset_port(port, set, clear);
1515 }
1516
1517 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1518                 unsigned int set, unsigned int clear)
1519 {
1520         u16 control = 0;
1521
1522         if (set & TIOCM_RTS) {
1523                 control |= CONTROL_RTS;
1524                 control |= CONTROL_WRITE_RTS;
1525         }
1526         if (set & TIOCM_DTR) {
1527                 control |= CONTROL_DTR;
1528                 control |= CONTROL_WRITE_DTR;
1529         }
1530         if (clear & TIOCM_RTS) {
1531                 control &= ~CONTROL_RTS;
1532                 control |= CONTROL_WRITE_RTS;
1533         }
1534         if (clear & TIOCM_DTR) {
1535                 control &= ~CONTROL_DTR;
1536                 control |= CONTROL_WRITE_DTR;
1537         }
1538
1539         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1540
1541         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1542 }
1543
1544 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1545 {
1546         if (on)
1547                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1548         else
1549                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1550 }
1551
1552 static int cp210x_tiocmget(struct tty_struct *tty)
1553 {
1554         struct usb_serial_port *port = tty->driver_data;
1555         u8 control;
1556         int result;
1557
1558         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1559         if (result)
1560                 return result;
1561
1562         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1563                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1564                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1565                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1566                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1567                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1568
1569         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1570
1571         return result;
1572 }
1573
1574 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1575 {
1576         struct usb_serial_port *port = tty->driver_data;
1577         u16 state;
1578
1579         if (break_state == 0)
1580                 state = BREAK_OFF;
1581         else
1582                 state = BREAK_ON;
1583         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1584                 state == BREAK_OFF ? "off" : "on");
1585         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1586 }
1587
1588 #ifdef CONFIG_GPIOLIB
1589 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1590 {
1591         struct usb_serial *serial = gpiochip_get_data(gc);
1592         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1593
1594         if (priv->gpio_altfunc & BIT(offset))
1595                 return -ENODEV;
1596
1597         return 0;
1598 }
1599
1600 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1601 {
1602         struct usb_serial *serial = gpiochip_get_data(gc);
1603         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1604         u8 req_type = REQTYPE_DEVICE_TO_HOST;
1605         int result;
1606         u8 buf;
1607
1608         if (priv->partnum == CP210X_PARTNUM_CP2105)
1609                 req_type = REQTYPE_INTERFACE_TO_HOST;
1610
1611         result = usb_autopm_get_interface(serial->interface);
1612         if (result)
1613                 return result;
1614
1615         result = cp210x_read_vendor_block(serial, req_type,
1616                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1617         usb_autopm_put_interface(serial->interface);
1618         if (result < 0)
1619                 return result;
1620
1621         return !!(buf & BIT(gpio));
1622 }
1623
1624 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1625 {
1626         struct usb_serial *serial = gpiochip_get_data(gc);
1627         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1628         struct cp210x_gpio_write buf;
1629         int result;
1630
1631         if (value == 1)
1632                 buf.state = BIT(gpio);
1633         else
1634                 buf.state = 0;
1635
1636         buf.mask = BIT(gpio);
1637
1638         result = usb_autopm_get_interface(serial->interface);
1639         if (result)
1640                 goto out;
1641
1642         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1643                 result = cp210x_write_vendor_block(serial,
1644                                                    REQTYPE_HOST_TO_INTERFACE,
1645                                                    CP210X_WRITE_LATCH, &buf,
1646                                                    sizeof(buf));
1647         } else {
1648                 u16 wIndex = buf.state << 8 | buf.mask;
1649
1650                 result = usb_control_msg(serial->dev,
1651                                          usb_sndctrlpipe(serial->dev, 0),
1652                                          CP210X_VENDOR_SPECIFIC,
1653                                          REQTYPE_HOST_TO_DEVICE,
1654                                          CP210X_WRITE_LATCH,
1655                                          wIndex,
1656                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1657         }
1658
1659         usb_autopm_put_interface(serial->interface);
1660 out:
1661         if (result < 0) {
1662                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1663                                 result);
1664         }
1665 }
1666
1667 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1668 {
1669         struct usb_serial *serial = gpiochip_get_data(gc);
1670         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1671
1672         return priv->gpio_input & BIT(gpio);
1673 }
1674
1675 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1676 {
1677         struct usb_serial *serial = gpiochip_get_data(gc);
1678         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1679
1680         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1681                 /* hardware does not support an input mode */
1682                 return -ENOTSUPP;
1683         }
1684
1685         /* push-pull pins cannot be changed to be inputs */
1686         if (priv->gpio_pushpull & BIT(gpio))
1687                 return -EINVAL;
1688
1689         /* make sure to release pin if it is being driven low */
1690         cp210x_gpio_set(gc, gpio, 1);
1691
1692         priv->gpio_input |= BIT(gpio);
1693
1694         return 0;
1695 }
1696
1697 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1698                                         int value)
1699 {
1700         struct usb_serial *serial = gpiochip_get_data(gc);
1701         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1702
1703         priv->gpio_input &= ~BIT(gpio);
1704         cp210x_gpio_set(gc, gpio, value);
1705
1706         return 0;
1707 }
1708
1709 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1710                                   unsigned long config)
1711 {
1712         struct usb_serial *serial = gpiochip_get_data(gc);
1713         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1714         enum pin_config_param param = pinconf_to_config_param(config);
1715
1716         /* Succeed only if in correct mode (this can't be set at runtime) */
1717         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1718             (priv->gpio_pushpull & BIT(gpio)))
1719                 return 0;
1720
1721         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1722             !(priv->gpio_pushpull & BIT(gpio)))
1723                 return 0;
1724
1725         return -ENOTSUPP;
1726 }
1727
1728 /*
1729  * This function is for configuring GPIO using shared pins, where other signals
1730  * are made unavailable by configuring the use of GPIO. This is believed to be
1731  * only applicable to the cp2105 at this point, the other devices supported by
1732  * this driver that provide GPIO do so in a way that does not impact other
1733  * signals and are thus expected to have very different initialisation.
1734  */
1735 static int cp2105_gpioconf_init(struct usb_serial *serial)
1736 {
1737         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1738         struct cp210x_pin_mode mode;
1739         struct cp210x_dual_port_config config;
1740         u8 intf_num = cp210x_interface_num(serial);
1741         u8 iface_config;
1742         int result;
1743
1744         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1745                                           CP210X_GET_DEVICEMODE, &mode,
1746                                           sizeof(mode));
1747         if (result < 0)
1748                 return result;
1749
1750         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1751                                           CP210X_GET_PORTCONFIG, &config,
1752                                           sizeof(config));
1753         if (result < 0)
1754                 return result;
1755
1756         /*  2 banks of GPIO - One for the pins taken from each serial port */
1757         if (intf_num == 0) {
1758                 priv->gc.ngpio = 2;
1759
1760                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1761                         /* mark all GPIOs of this interface as reserved */
1762                         priv->gpio_altfunc = 0xff;
1763                         return 0;
1764                 }
1765
1766                 iface_config = config.eci_cfg;
1767                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1768                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1769                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1770         } else if (intf_num == 1) {
1771                 priv->gc.ngpio = 3;
1772
1773                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1774                         /* mark all GPIOs of this interface as reserved */
1775                         priv->gpio_altfunc = 0xff;
1776                         return 0;
1777                 }
1778
1779                 iface_config = config.sci_cfg;
1780                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1781                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1782                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1783         } else {
1784                 return -ENODEV;
1785         }
1786
1787         /* mark all pins which are not in GPIO mode */
1788         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1789                 priv->gpio_altfunc |= BIT(0);
1790         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1791                         CP2105_GPIO1_RS485_MODE))
1792                 priv->gpio_altfunc |= BIT(1);
1793
1794         /* driver implementation for CP2105 only supports outputs */
1795         priv->gpio_input = 0;
1796
1797         return 0;
1798 }
1799
1800 static int cp2104_gpioconf_init(struct usb_serial *serial)
1801 {
1802         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1803         struct cp210x_single_port_config config;
1804         u8 iface_config;
1805         u8 gpio_latch;
1806         int result;
1807         u8 i;
1808
1809         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1810                                           CP210X_GET_PORTCONFIG, &config,
1811                                           sizeof(config));
1812         if (result < 0)
1813                 return result;
1814
1815         priv->gc.ngpio = 4;
1816
1817         iface_config = config.device_cfg;
1818         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1819                                         CP210X_GPIO_MODE_MASK) >>
1820                                         CP210X_GPIO_MODE_OFFSET);
1821         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1822                                         CP210X_GPIO_MODE_MASK) >>
1823                                         CP210X_GPIO_MODE_OFFSET);
1824
1825         /* mark all pins which are not in GPIO mode */
1826         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1827                 priv->gpio_altfunc |= BIT(0);
1828         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1829                 priv->gpio_altfunc |= BIT(1);
1830         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1831                 priv->gpio_altfunc |= BIT(2);
1832
1833         /*
1834          * Like CP2102N, CP2104 has also no strict input and output pin
1835          * modes.
1836          * Do the same input mode emulation as CP2102N.
1837          */
1838         for (i = 0; i < priv->gc.ngpio; ++i) {
1839                 /*
1840                  * Set direction to "input" iff pin is open-drain and reset
1841                  * value is 1.
1842                  */
1843                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1844                         priv->gpio_input |= BIT(i);
1845         }
1846
1847         return 0;
1848 }
1849
1850 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1851 {
1852         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1853         const u16 config_size = 0x02a6;
1854         u8 gpio_rst_latch;
1855         u8 config_version;
1856         u8 gpio_pushpull;
1857         u8 *config_buf;
1858         u8 gpio_latch;
1859         u8 gpio_ctrl;
1860         int result;
1861         u8 i;
1862
1863         /*
1864          * Retrieve device configuration from the device.
1865          * The array received contains all customization settings done at the
1866          * factory/manufacturer. Format of the array is documented at the
1867          * time of writing at:
1868          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1869          */
1870         config_buf = kmalloc(config_size, GFP_KERNEL);
1871         if (!config_buf)
1872                 return -ENOMEM;
1873
1874         result = cp210x_read_vendor_block(serial,
1875                                           REQTYPE_DEVICE_TO_HOST,
1876                                           CP210X_READ_2NCONFIG,
1877                                           config_buf,
1878                                           config_size);
1879         if (result < 0) {
1880                 kfree(config_buf);
1881                 return result;
1882         }
1883
1884         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1885         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1886         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1887         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1888
1889         kfree(config_buf);
1890
1891         /* Make sure this is a config format we understand. */
1892         if (config_version != 0x01)
1893                 return -ENOTSUPP;
1894
1895         priv->gc.ngpio = 4;
1896
1897         /*
1898          * Get default pin states after reset. Needed so we can determine
1899          * the direction of an open-drain pin.
1900          */
1901         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1902
1903         /* 0 indicates open-drain mode, 1 is push-pull */
1904         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1905
1906         /* 0 indicates GPIO mode, 1 is alternate function */
1907         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1908                 /* QFN20 is special... */
1909                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1910                         priv->gpio_altfunc |= BIT(0);
1911                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1912                         priv->gpio_altfunc |= BIT(1);
1913                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1914                         priv->gpio_altfunc |= BIT(2);
1915                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1916                         priv->gpio_altfunc |= BIT(3);
1917         } else {
1918                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1919         }
1920
1921         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1922                 /*
1923                  * For the QFN28 package, GPIO4-6 are controlled by
1924                  * the low three bits of the mode/latch fields.
1925                  * Contrary to the document linked above, the bits for
1926                  * the SUSPEND pins are elsewhere.  No alternate
1927                  * function is available for these pins.
1928                  */
1929                 priv->gc.ngpio = 7;
1930                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1931                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1932         }
1933
1934         /*
1935          * The CP2102N does not strictly has input and output pin modes,
1936          * it only knows open-drain and push-pull modes which is set at
1937          * factory. An open-drain pin can function both as an
1938          * input or an output. We emulate input mode for open-drain pins
1939          * by making sure they are not driven low, and we do not allow
1940          * push-pull pins to be set as an input.
1941          */
1942         for (i = 0; i < priv->gc.ngpio; ++i) {
1943                 /*
1944                  * Set direction to "input" iff pin is open-drain and reset
1945                  * value is 1.
1946                  */
1947                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1948                         priv->gpio_input |= BIT(i);
1949         }
1950
1951         return 0;
1952 }
1953
1954 static int cp210x_gpio_init(struct usb_serial *serial)
1955 {
1956         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1957         int result;
1958
1959         switch (priv->partnum) {
1960         case CP210X_PARTNUM_CP2104:
1961                 result = cp2104_gpioconf_init(serial);
1962                 break;
1963         case CP210X_PARTNUM_CP2105:
1964                 result = cp2105_gpioconf_init(serial);
1965                 break;
1966         case CP210X_PARTNUM_CP2102N_QFN28:
1967         case CP210X_PARTNUM_CP2102N_QFN24:
1968         case CP210X_PARTNUM_CP2102N_QFN20:
1969                 result = cp2102n_gpioconf_init(serial);
1970                 break;
1971         default:
1972                 return 0;
1973         }
1974
1975         if (result < 0)
1976                 return result;
1977
1978         priv->gc.label = "cp210x";
1979         priv->gc.request = cp210x_gpio_request;
1980         priv->gc.get_direction = cp210x_gpio_direction_get;
1981         priv->gc.direction_input = cp210x_gpio_direction_input;
1982         priv->gc.direction_output = cp210x_gpio_direction_output;
1983         priv->gc.get = cp210x_gpio_get;
1984         priv->gc.set = cp210x_gpio_set;
1985         priv->gc.set_config = cp210x_gpio_set_config;
1986         priv->gc.owner = THIS_MODULE;
1987         priv->gc.parent = &serial->interface->dev;
1988         priv->gc.base = -1;
1989         priv->gc.can_sleep = true;
1990
1991         result = gpiochip_add_data(&priv->gc, serial);
1992         if (!result)
1993                 priv->gpio_registered = true;
1994
1995         return result;
1996 }
1997
1998 static void cp210x_gpio_remove(struct usb_serial *serial)
1999 {
2000         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2001
2002         if (priv->gpio_registered) {
2003                 gpiochip_remove(&priv->gc);
2004                 priv->gpio_registered = false;
2005         }
2006 }
2007
2008 #else
2009
2010 static int cp210x_gpio_init(struct usb_serial *serial)
2011 {
2012         return 0;
2013 }
2014
2015 static void cp210x_gpio_remove(struct usb_serial *serial)
2016 {
2017         /* Nothing to do */
2018 }
2019
2020 #endif
2021
2022 static int cp210x_port_probe(struct usb_serial_port *port)
2023 {
2024         struct usb_serial *serial = port->serial;
2025         struct cp210x_port_private *port_priv;
2026         int ret;
2027
2028         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
2029         if (!port_priv)
2030                 return -ENOMEM;
2031
2032         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
2033
2034         usb_set_serial_port_data(port, port_priv);
2035
2036         ret = cp210x_detect_swapped_line_ctl(port);
2037         if (ret) {
2038                 kfree(port_priv);
2039                 return ret;
2040         }
2041
2042         return 0;
2043 }
2044
2045 static int cp210x_port_remove(struct usb_serial_port *port)
2046 {
2047         struct cp210x_port_private *port_priv;
2048
2049         port_priv = usb_get_serial_port_data(port);
2050         kfree(port_priv);
2051
2052         return 0;
2053 }
2054
2055 static void cp210x_init_max_speed(struct usb_serial *serial)
2056 {
2057         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2058         bool use_actual_rate = false;
2059         speed_t min = 300;
2060         speed_t max;
2061
2062         switch (priv->partnum) {
2063         case CP210X_PARTNUM_CP2101:
2064                 max = 921600;
2065                 break;
2066         case CP210X_PARTNUM_CP2102:
2067         case CP210X_PARTNUM_CP2103:
2068                 max = 1000000;
2069                 break;
2070         case CP210X_PARTNUM_CP2104:
2071                 use_actual_rate = true;
2072                 max = 2000000;
2073                 break;
2074         case CP210X_PARTNUM_CP2108:
2075                 max = 2000000;
2076                 break;
2077         case CP210X_PARTNUM_CP2105:
2078                 if (cp210x_interface_num(serial) == 0) {
2079                         use_actual_rate = true;
2080                         max = 2000000;  /* ECI */
2081                 } else {
2082                         min = 2400;
2083                         max = 921600;   /* SCI */
2084                 }
2085                 break;
2086         case CP210X_PARTNUM_CP2102N_QFN28:
2087         case CP210X_PARTNUM_CP2102N_QFN24:
2088         case CP210X_PARTNUM_CP2102N_QFN20:
2089                 use_actual_rate = true;
2090                 max = 3000000;
2091                 break;
2092         default:
2093                 max = 2000000;
2094                 break;
2095         }
2096
2097         priv->min_speed = min;
2098         priv->max_speed = max;
2099         priv->use_actual_rate = use_actual_rate;
2100 }
2101
2102 static void cp2102_determine_quirks(struct usb_serial *serial)
2103 {
2104         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2105         u8 *buf;
2106         int ret;
2107
2108         buf = kmalloc(2, GFP_KERNEL);
2109         if (!buf)
2110                 return;
2111         /*
2112          * Some (possibly counterfeit) CP2102 do not support event-insertion
2113          * mode and respond differently to malformed vendor requests.
2114          * Specifically, they return one instead of two bytes when sent a
2115          * two-byte part-number request.
2116          */
2117         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2118                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2119                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2120         if (ret == 1) {
2121                 dev_dbg(&serial->interface->dev,
2122                                 "device does not support event-insertion mode\n");
2123                 priv->no_event_mode = true;
2124         }
2125
2126         kfree(buf);
2127 }
2128
2129 static void cp210x_determine_quirks(struct usb_serial *serial)
2130 {
2131         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2132
2133         switch (priv->partnum) {
2134         case CP210X_PARTNUM_CP2102:
2135                 cp2102_determine_quirks(serial);
2136                 break;
2137         default:
2138                 break;
2139         }
2140 }
2141
2142 static int cp210x_attach(struct usb_serial *serial)
2143 {
2144         int result;
2145         struct cp210x_serial_private *priv;
2146
2147         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2148         if (!priv)
2149                 return -ENOMEM;
2150
2151         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2152                                           CP210X_GET_PARTNUM, &priv->partnum,
2153                                           sizeof(priv->partnum));
2154         if (result < 0) {
2155                 dev_warn(&serial->interface->dev,
2156                          "querying part number failed\n");
2157                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2158         }
2159
2160         usb_set_serial_data(serial, priv);
2161
2162         cp210x_determine_quirks(serial);
2163         cp210x_init_max_speed(serial);
2164
2165         result = cp210x_gpio_init(serial);
2166         if (result < 0) {
2167                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2168                                 result);
2169         }
2170
2171         return 0;
2172 }
2173
2174 static void cp210x_disconnect(struct usb_serial *serial)
2175 {
2176         cp210x_gpio_remove(serial);
2177 }
2178
2179 static void cp210x_release(struct usb_serial *serial)
2180 {
2181         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2182
2183         cp210x_gpio_remove(serial);
2184
2185         kfree(priv);
2186 }
2187
2188 module_usb_serial_driver(serial_drivers, id_table);
2189
2190 MODULE_DESCRIPTION(DRIVER_DESC);
2191 MODULE_LICENSE("GPL v2");