drivers/usb/serial/cp210x.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   4  *
   5  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   6  * Copyright (C) 2010-2021 Johan Hovold (johan@kernel.org)
   7  *
   8  * Support to set flow control line levels using TIOCMGET and TIOCMSET
   9  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  10  * control thanks to Munir Nassar nassarmu@real-time.com
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/gpio/driver.h>
  23 #include <linux/bitops.h>
  24 #include <linux/mutex.h>
  25
  26 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  27
  28 /*
  29  * Function Prototypes
  30  */
  31 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  32 static void cp210x_close(struct usb_serial_port *);
  33 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  34                                                         struct ktermios *);
  35 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  36                                                         struct ktermios*);
  37 static bool cp210x_tx_empty(struct usb_serial_port *port);
  38 static int cp210x_tiocmget(struct tty_struct *);
  39 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  40 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  41                 unsigned int, unsigned int);
  42 static void cp210x_break_ctl(struct tty_struct *, int);
  43 static int cp210x_attach(struct usb_serial *);
  44 static void cp210x_disconnect(struct usb_serial *);
  45 static void cp210x_release(struct usb_serial *);
  46 static int cp210x_port_probe(struct usb_serial_port *);
  47 static void cp210x_port_remove(struct usb_serial_port *);
  48 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
  49 static void cp210x_process_read_urb(struct urb *urb);
  50 static void cp210x_enable_event_mode(struct usb_serial_port *port);
  51 static void cp210x_disable_event_mode(struct usb_serial_port *port);
  52
  53 static const struct usb_device_id id_table[] = {
  54         { USB_DEVICE(0x0404, 0x034C) }, /* NCR Retail IO Box */
  55         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  56         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  57         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  59         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  60         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  63         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  64         { USB_DEVICE(0x0988, 0x0578) }, /* Teraoka AD2000 */
  65         { USB_DEVICE(0x0B00, 0x3070) }, /* Ingenico 3070 */
  66         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  67         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  68         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  69         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  70         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  71         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  72         { USB_DEVICE(0x106F, 0x0003) }, /* CPI / Money Controls Bulk Coin Recycler */
  73         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  74         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  75         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  76         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  77         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  78         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  79         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  80         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  81         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  82         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  83         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  84         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  85         { USB_DEVICE(0x10C4, 0x8056) }, /* Lorenz Messtechnik devices */
  86         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  87         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  88         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  89         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  90         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  91         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  92         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  93         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  94         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  95         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  96         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  97         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  98         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  99         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
 100         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 101         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 102         { USB_DEVICE(0x10C4, 0x817C) }, /* CESINEL MEDCAL N Power Quality Monitor */
 103         { USB_DEVICE(0x10C4, 0x817D) }, /* CESINEL MEDCAL NT Power Quality Monitor */
 104         { USB_DEVICE(0x10C4, 0x817E) }, /* CESINEL MEDCAL S Power Quality Monitor */
 105         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 106         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 107         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 108         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 109         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 110         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 111         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 112         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 113         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 114         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 115         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 116         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 117         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 118         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 119         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 120         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 121         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 122         { USB_DEVICE(0x10C4, 0x82EF) }, /* CESINEL FALCO 6105 AC Power Supply */
 123         { USB_DEVICE(0x10C4, 0x82F1) }, /* CESINEL MEDCAL EFD Earth Fault Detector */
 124         { USB_DEVICE(0x10C4, 0x82F2) }, /* CESINEL MEDCAL ST Network Analyzer */
 125         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 126         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 127         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 128         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 129         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 130         { USB_DEVICE(0x10C4, 0x83AA) }, /* Mark-10 Digital Force Gauge */
 131         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 132         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 133         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 134         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 135         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 136         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 137         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 138         { USB_DEVICE(0x10C4, 0x851E) }, /* CESINEL MEDCAL PT Network Analyzer */
 139         { USB_DEVICE(0x10C4, 0x85A7) }, /* LifeScan OneTouch Verio IQ */
 140         { USB_DEVICE(0x10C4, 0x85B8) }, /* CESINEL ReCon T Energy Logger */
 141         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 142         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 143         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 144         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 145         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 146         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 147         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 148         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 149         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 150         { USB_DEVICE(0x10C4, 0x88D8) }, /* Acuity Brands nLight Air Adapter */
 151         { USB_DEVICE(0x10C4, 0x88FB) }, /* CESINEL MEDCAL STII Network Analyzer */
 152         { USB_DEVICE(0x10C4, 0x8938) }, /* CESINEL MEDCAL S II Network Analyzer */
 153         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 154         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 155         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 156         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 157         { USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
 158         { USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
 159         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 160         { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
 161         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 162         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 163         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 164         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 165         { USB_DEVICE(0x10C4, 0xEA63) }, /* Silicon Labs Windows Update (CP2101-4/CP2102N) */
 166         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 167         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 168         { USB_DEVICE(0x10C4, 0xEA7A) }, /* Silicon Labs Windows Update (CP2105) */
 169         { USB_DEVICE(0x10C4, 0xEA7B) }, /* Silicon Labs Windows Update (CP2108) */
 170         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 171         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 172         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 173         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 174         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 175         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 176         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 177         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 178         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 179         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 180         { USB_DEVICE(0x155A, 0x1006) }, /* ELDAT Easywave RX09 */
 181         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 182         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 183         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 184         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 185         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 186         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 187         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 188         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 189         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 190         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 191         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 192         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 193         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 194         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 195         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 196         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 197         { USB_DEVICE(0x17A8, 0x0101) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Int Ant) */
 198         { USB_DEVICE(0x17A8, 0x0102) }, /* Kamstrup 868 MHz wM-Bus C-Mode Meter Reader (Ext Ant) */
 199         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 200         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 201         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 202         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 203         { USB_DEVICE(0x18EF, 0xE030) }, /* ELV ALC 8xxx Battery Charger */
 204         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 205         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 206         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 207         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 208         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 209         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 210         { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
 211         { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
 212         { USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
 213         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 214         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 215         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 216         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 217         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 218         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 219         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 220         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 221         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 222         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 223         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 224         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 225         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 226         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 227         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 228         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 229         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 230         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 231         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 232         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 233         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 234         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 235         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 236         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 237         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 238         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 239         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 240         { USB_DEVICE(0x2184, 0x0030) }, /* GW Instek GDM-834x Digital Multimeter */
 241         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 242         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 243         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 244         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 245         { USB_DEVICE(0x3923, 0x7A0B) }, /* National Instruments USB Serial Console */
 246         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 247         { } /* Terminating Entry */
 248 };
 249
 250 MODULE_DEVICE_TABLE(usb, id_table);
 251
 252 struct cp210x_serial_private {
 253 #ifdef CONFIG_GPIOLIB
 254         struct gpio_chip        gc;
 255         bool                    gpio_registered;
 256         u16                     gpio_pushpull;
 257         u16                     gpio_altfunc;
 258         u16                     gpio_input;
 259 #endif
 260         u8                      partnum;
 261         u32                     fw_version;
 262         speed_t                 min_speed;
 263         speed_t                 max_speed;
 264         bool                    use_actual_rate;
 265         bool                    no_flow_control;
 266         bool                    no_event_mode;
 267 };
 268
 269 enum cp210x_event_state {
 270         ES_DATA,
 271         ES_ESCAPE,
 272         ES_LSR,
 273         ES_LSR_DATA_0,
 274         ES_LSR_DATA_1,
 275         ES_MSR
 276 };
 277
 278 struct cp210x_port_private {
 279         u8                      bInterfaceNumber;
 280         bool                    event_mode;
 281         enum cp210x_event_state event_state;
 282         u8                      lsr;
 283
 284         struct mutex            mutex;
 285         bool                    crtscts;
 286         bool                    dtr;
 287         bool                    rts;
 288 };
 289
 290 static struct usb_serial_driver cp210x_device = {
 291         .driver = {
 292                 .owner =        THIS_MODULE,
 293                 .name =         "cp210x",
 294         },
 295         .id_table               = id_table,
 296         .num_ports              = 1,
 297         .bulk_in_size           = 256,
 298         .bulk_out_size          = 256,
 299         .open                   = cp210x_open,
 300         .close                  = cp210x_close,
 301         .break_ctl              = cp210x_break_ctl,
 302         .set_termios            = cp210x_set_termios,
 303         .tx_empty               = cp210x_tx_empty,
 304         .throttle               = usb_serial_generic_throttle,
 305         .unthrottle             = usb_serial_generic_unthrottle,
 306         .tiocmget               = cp210x_tiocmget,
 307         .tiocmset               = cp210x_tiocmset,
 308         .get_icount             = usb_serial_generic_get_icount,
 309         .attach                 = cp210x_attach,
 310         .disconnect             = cp210x_disconnect,
 311         .release                = cp210x_release,
 312         .port_probe             = cp210x_port_probe,
 313         .port_remove            = cp210x_port_remove,
 314         .dtr_rts                = cp210x_dtr_rts,
 315         .process_read_urb       = cp210x_process_read_urb,
 316 };
 317
 318 static struct usb_serial_driver * const serial_drivers[] = {
 319         &cp210x_device, NULL
 320 };
 321
 322 /* Config request types */
 323 #define REQTYPE_HOST_TO_INTERFACE       0x41
 324 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 325 #define REQTYPE_HOST_TO_DEVICE  0x40
 326 #define REQTYPE_DEVICE_TO_HOST  0xc0
 327
 328 /* Config request codes */
 329 #define CP210X_IFC_ENABLE       0x00
 330 #define CP210X_SET_BAUDDIV      0x01
 331 #define CP210X_GET_BAUDDIV      0x02
 332 #define CP210X_SET_LINE_CTL     0x03
 333 #define CP210X_GET_LINE_CTL     0x04
 334 #define CP210X_SET_BREAK        0x05
 335 #define CP210X_IMM_CHAR         0x06
 336 #define CP210X_SET_MHS          0x07
 337 #define CP210X_GET_MDMSTS       0x08
 338 #define CP210X_SET_XON          0x09
 339 #define CP210X_SET_XOFF         0x0A
 340 #define CP210X_SET_EVENTMASK    0x0B
 341 #define CP210X_GET_EVENTMASK    0x0C
 342 #define CP210X_SET_CHAR         0x0D
 343 #define CP210X_GET_CHARS        0x0E
 344 #define CP210X_GET_PROPS        0x0F
 345 #define CP210X_GET_COMM_STATUS  0x10
 346 #define CP210X_RESET            0x11
 347 #define CP210X_PURGE            0x12
 348 #define CP210X_SET_FLOW         0x13
 349 #define CP210X_GET_FLOW         0x14
 350 #define CP210X_EMBED_EVENTS     0x15
 351 #define CP210X_GET_EVENTSTATE   0x16
 352 #define CP210X_SET_CHARS        0x19
 353 #define CP210X_GET_BAUDRATE     0x1D
 354 #define CP210X_SET_BAUDRATE     0x1E
 355 #define CP210X_VENDOR_SPECIFIC  0xFF
 356
 357 /* CP210X_IFC_ENABLE */
 358 #define UART_ENABLE             0x0001
 359 #define UART_DISABLE            0x0000
 360
 361 /* CP210X_(SET|GET)_BAUDDIV */
 362 #define BAUD_RATE_GEN_FREQ      0x384000
 363
 364 /* CP210X_(SET|GET)_LINE_CTL */
 365 #define BITS_DATA_MASK          0X0f00
 366 #define BITS_DATA_5             0X0500
 367 #define BITS_DATA_6             0X0600
 368 #define BITS_DATA_7             0X0700
 369 #define BITS_DATA_8             0X0800
 370 #define BITS_DATA_9             0X0900
 371
 372 #define BITS_PARITY_MASK        0x00f0
 373 #define BITS_PARITY_NONE        0x0000
 374 #define BITS_PARITY_ODD         0x0010
 375 #define BITS_PARITY_EVEN        0x0020
 376 #define BITS_PARITY_MARK        0x0030
 377 #define BITS_PARITY_SPACE       0x0040
 378
 379 #define BITS_STOP_MASK          0x000f
 380 #define BITS_STOP_1             0x0000
 381 #define BITS_STOP_1_5           0x0001
 382 #define BITS_STOP_2             0x0002
 383
 384 /* CP210X_SET_BREAK */
 385 #define BREAK_ON                0x0001
 386 #define BREAK_OFF               0x0000
 387
 388 /* CP210X_(SET_MHS|GET_MDMSTS) */
 389 #define CONTROL_DTR             0x0001
 390 #define CONTROL_RTS             0x0002
 391 #define CONTROL_CTS             0x0010
 392 #define CONTROL_DSR             0x0020
 393 #define CONTROL_RING            0x0040
 394 #define CONTROL_DCD             0x0080
 395 #define CONTROL_WRITE_DTR       0x0100
 396 #define CONTROL_WRITE_RTS       0x0200
 397
 398 /* CP210X_(GET|SET)_CHARS */
 399 struct cp210x_special_chars {
 400         u8      bEofChar;
 401         u8      bErrorChar;
 402         u8      bBreakChar;
 403         u8      bEventChar;
 404         u8      bXonChar;
 405         u8      bXoffChar;
 406 };
 407
 408 /* CP210X_VENDOR_SPECIFIC values */
 409 #define CP210X_GET_FW_VER       0x000E
 410 #define CP210X_READ_2NCONFIG    0x000E
 411 #define CP210X_GET_FW_VER_2N    0x0010
 412 #define CP210X_READ_LATCH       0x00C2
 413 #define CP210X_GET_PARTNUM      0x370B
 414 #define CP210X_GET_PORTCONFIG   0x370C
 415 #define CP210X_GET_DEVICEMODE   0x3711
 416 #define CP210X_WRITE_LATCH      0x37E1
 417
 418 /* Part number definitions */
 419 #define CP210X_PARTNUM_CP2101   0x01
 420 #define CP210X_PARTNUM_CP2102   0x02
 421 #define CP210X_PARTNUM_CP2103   0x03
 422 #define CP210X_PARTNUM_CP2104   0x04
 423 #define CP210X_PARTNUM_CP2105   0x05
 424 #define CP210X_PARTNUM_CP2108   0x08
 425 #define CP210X_PARTNUM_CP2102N_QFN28    0x20
 426 #define CP210X_PARTNUM_CP2102N_QFN24    0x21
 427 #define CP210X_PARTNUM_CP2102N_QFN20    0x22
 428 #define CP210X_PARTNUM_UNKNOWN  0xFF
 429
 430 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 431 struct cp210x_comm_status {
 432         __le32   ulErrors;
 433         __le32   ulHoldReasons;
 434         __le32   ulAmountInInQueue;
 435         __le32   ulAmountInOutQueue;
 436         u8       bEofReceived;
 437         u8       bWaitForImmediate;
 438         u8       bReserved;
 439 } __packed;
 440
 441 /*
 442  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 443  * SiLabs app note AN571 gives a strange description of the 4 bits:
 444  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 445  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 446  */
 447 #define PURGE_ALL               0x000f
 448
 449 /* CP210X_EMBED_EVENTS */
 450 #define CP210X_ESCCHAR          0xec
 451
 452 #define CP210X_LSR_OVERRUN      BIT(1)
 453 #define CP210X_LSR_PARITY       BIT(2)
 454 #define CP210X_LSR_FRAME        BIT(3)
 455 #define CP210X_LSR_BREAK        BIT(4)
 456
 457
 458 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 459 struct cp210x_flow_ctl {
 460         __le32  ulControlHandshake;
 461         __le32  ulFlowReplace;
 462         __le32  ulXonLimit;
 463         __le32  ulXoffLimit;
 464 };
 465
 466 /* cp210x_flow_ctl::ulControlHandshake */
 467 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 468 #define CP210X_SERIAL_DTR_INACTIVE      (0 << 0)
 469 #define CP210X_SERIAL_DTR_ACTIVE        (1 << 0)
 470 #define CP210X_SERIAL_DTR_FLOW_CTL      (2 << 0)
 471 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 472 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 473 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 474 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 475
 476 /* cp210x_flow_ctl::ulFlowReplace */
 477 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 478 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 479 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 480 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 481 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 482 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 483 #define CP210X_SERIAL_RTS_INACTIVE      (0 << 6)
 484 #define CP210X_SERIAL_RTS_ACTIVE        (1 << 6)
 485 #define CP210X_SERIAL_RTS_FLOW_CTL      (2 << 6)
 486 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 487
 488 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 489 struct cp210x_pin_mode {
 490         u8      eci;
 491         u8      sci;
 492 };
 493
 494 #define CP210X_PIN_MODE_MODEM           0
 495 #define CP210X_PIN_MODE_GPIO            BIT(0)
 496
 497 /*
 498  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes
 499  * on a CP2105 chip. Structure needs padding due to unused/unspecified bytes.
 500  */
 501 struct cp210x_dual_port_config {
 502         __le16  gpio_mode;
 503         u8      __pad0[2];
 504         __le16  reset_state;
 505         u8      __pad1[4];
 506         __le16  suspend_state;
 507         u8      sci_cfg;
 508         u8      eci_cfg;
 509         u8      device_cfg;
 510 } __packed;
 511
 512 /*
 513  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xd bytes
 514  * on a CP2104 chip. Structure needs padding due to unused/unspecified bytes.
 515  */
 516 struct cp210x_single_port_config {
 517         __le16  gpio_mode;
 518         u8      __pad0[2];
 519         __le16  reset_state;
 520         u8      __pad1[4];
 521         __le16  suspend_state;
 522         u8      device_cfg;
 523 } __packed;
 524
 525 /* GPIO modes */
 526 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 527 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 528
 529 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 530 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 531
 532 #define CP210X_GPIO_MODE_OFFSET         8
 533 #define CP210X_GPIO_MODE_MASK           GENMASK(11, 8)
 534
 535 /* CP2105 port configuration values */
 536 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 537 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 538 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 539
 540 /* CP2104 port configuration values */
 541 #define CP2104_GPIO0_TXLED_MODE         BIT(0)
 542 #define CP2104_GPIO1_RXLED_MODE         BIT(1)
 543 #define CP2104_GPIO2_RS485_MODE         BIT(2)
 544
 545 struct cp210x_quad_port_state {
 546         __le16 gpio_mode_pb0;
 547         __le16 gpio_mode_pb1;
 548         __le16 gpio_mode_pb2;
 549         __le16 gpio_mode_pb3;
 550         __le16 gpio_mode_pb4;
 551
 552         __le16 gpio_lowpower_pb0;
 553         __le16 gpio_lowpower_pb1;
 554         __le16 gpio_lowpower_pb2;
 555         __le16 gpio_lowpower_pb3;
 556         __le16 gpio_lowpower_pb4;
 557
 558         __le16 gpio_latch_pb0;
 559         __le16 gpio_latch_pb1;
 560         __le16 gpio_latch_pb2;
 561         __le16 gpio_latch_pb3;
 562         __le16 gpio_latch_pb4;
 563 };
 564
 565 /*
 566  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
 567  * on a CP2108 chip.
 568  *
 569  * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
 570  */
 571 struct cp210x_quad_port_config {
 572         struct cp210x_quad_port_state reset_state;
 573         struct cp210x_quad_port_state suspend_state;
 574         u8 ipdelay_ifc[4];
 575         u8 enhancedfxn_ifc[4];
 576         u8 enhancedfxn_device;
 577         u8 extclkfreq[4];
 578 } __packed;
 579
 580 #define CP2108_EF_IFC_GPIO_TXLED                0x01
 581 #define CP2108_EF_IFC_GPIO_RXLED                0x02
 582 #define CP2108_EF_IFC_GPIO_RS485                0x04
 583 #define CP2108_EF_IFC_GPIO_RS485_LOGIC          0x08
 584 #define CP2108_EF_IFC_GPIO_CLOCK                0x10
 585 #define CP2108_EF_IFC_DYNAMIC_SUSPEND           0x40
 586
 587 /* CP2102N configuration array indices */
 588 #define CP210X_2NCONFIG_CONFIG_VERSION_IDX      2
 589 #define CP210X_2NCONFIG_GPIO_MODE_IDX           581
 590 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX       587
 591 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX        600
 592
 593 /* CP2102N QFN20 port configuration values */
 594 #define CP2102N_QFN20_GPIO2_TXLED_MODE          BIT(2)
 595 #define CP2102N_QFN20_GPIO3_RXLED_MODE          BIT(3)
 596 #define CP2102N_QFN20_GPIO1_RS485_MODE          BIT(4)
 597 #define CP2102N_QFN20_GPIO0_CLK_MODE            BIT(6)
 598
 599 /*
 600  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x02 bytes
 601  * for CP2102N, CP2103, CP2104 and CP2105.
 602  */
 603 struct cp210x_gpio_write {
 604         u8      mask;
 605         u8      state;
 606 };
 607
 608 /*
 609  * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
 610  * for CP2108.
 611  */
 612 struct cp210x_gpio_write16 {
 613         __le16  mask;
 614         __le16  state;
 615 };
 616
 617 /*
 618  * Helper to get interface number when we only have struct usb_serial.
 619  */
 620 static u8 cp210x_interface_num(struct usb_serial *serial)
 621 {
 622         struct usb_host_interface *cur_altsetting;
 623
 624         cur_altsetting = serial->interface->cur_altsetting;
 625
 626         return cur_altsetting->desc.bInterfaceNumber;
 627 }
 628
 629 /*
 630  * Reads a variable-sized block of CP210X_ registers, identified by req.
 631  * Returns data into buf in native USB byte order.
 632  */
 633 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 634                 void *buf, int bufsize)
 635 {
 636         struct usb_serial *serial = port->serial;
 637         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 638         int result;
 639
 640
 641         result = usb_control_msg_recv(serial->dev, 0, req,
 642                         REQTYPE_INTERFACE_TO_HOST, 0,
 643                         port_priv->bInterfaceNumber, buf, bufsize,
 644                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 645         if (result) {
 646                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 647                                 req, bufsize, result);
 648                 return result;
 649         }
 650
 651         return 0;
 652 }
 653
 654 /*
 655  * Reads any 8-bit CP210X_ register identified by req.
 656  */
 657 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 658 {
 659         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 660 }
 661
 662 /*
 663  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 664  * Returns data into buf in native USB byte order.
 665  */
 666 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 667                                     void *buf, int bufsize)
 668 {
 669         int result;
 670
 671         result = usb_control_msg_recv(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 672                         type, val, cp210x_interface_num(serial), buf, bufsize,
 673                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 674         if (result) {
 675                 dev_err(&serial->interface->dev,
 676                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 677                         bufsize, result);
 678                 return result;
 679         }
 680
 681         return 0;
 682 }
 683
 684 /*
 685  * Writes any 16-bit CP210X_ register (req) whose value is passed
 686  * entirely in the wValue field of the USB request.
 687  */
 688 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 689 {
 690         struct usb_serial *serial = port->serial;
 691         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 692         int result;
 693
 694         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 695                         req, REQTYPE_HOST_TO_INTERFACE, val,
 696                         port_priv->bInterfaceNumber, NULL, 0,
 697                         USB_CTRL_SET_TIMEOUT);
 698         if (result < 0) {
 699                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 700                                 req, result);
 701         }
 702
 703         return result;
 704 }
 705
 706 /*
 707  * Writes a variable-sized block of CP210X_ registers, identified by req.
 708  * Data in buf must be in native USB byte order.
 709  */
 710 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 711                 void *buf, int bufsize)
 712 {
 713         struct usb_serial *serial = port->serial;
 714         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 715         int result;
 716
 717         result = usb_control_msg_send(serial->dev, 0, req,
 718                         REQTYPE_HOST_TO_INTERFACE, 0,
 719                         port_priv->bInterfaceNumber, buf, bufsize,
 720                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 721         if (result) {
 722                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 723                                 req, bufsize, result);
 724                 return result;
 725         }
 726
 727         return 0;
 728 }
 729
 730 /*
 731  * Writes any 32-bit CP210X_ register identified by req.
 732  */
 733 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 734 {
 735         __le32 le32_val;
 736
 737         le32_val = cpu_to_le32(val);
 738
 739         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 740 }
 741
 742 #ifdef CONFIG_GPIOLIB
 743 /*
 744  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 745  * Data in buf must be in native USB byte order.
 746  */
 747 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 748                                      u16 val, void *buf, int bufsize)
 749 {
 750         int result;
 751
 752         result = usb_control_msg_send(serial->dev, 0, CP210X_VENDOR_SPECIFIC,
 753                         type, val, cp210x_interface_num(serial), buf, bufsize,
 754                         USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 755         if (result) {
 756                 dev_err(&serial->interface->dev,
 757                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 758                         bufsize, result);
 759                 return result;
 760         }
 761
 762         return 0;
 763 }
 764 #endif
 765
 766 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 767 {
 768         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 769         int result;
 770
 771         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 772         if (result) {
 773                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 774                 return result;
 775         }
 776
 777         if (tty)
 778                 cp210x_set_termios(tty, port, NULL);
 779
 780         result = usb_serial_generic_open(tty, port);
 781         if (result)
 782                 goto err_disable;
 783
 784         return 0;
 785
 786 err_disable:
 787         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 788         port_priv->event_mode = false;
 789
 790         return result;
 791 }
 792
 793 static void cp210x_close(struct usb_serial_port *port)
 794 {
 795         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 796
 797         usb_serial_generic_close(port);
 798
 799         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 800         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 801
 802         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 803
 804         /* Disabling the interface disables event-insertion mode. */
 805         port_priv->event_mode = false;
 806 }
 807
 808 static void cp210x_process_lsr(struct usb_serial_port *port, unsigned char lsr, char *flag)
 809 {
 810         if (lsr & CP210X_LSR_BREAK) {
 811                 port->icount.brk++;
 812                 *flag = TTY_BREAK;
 813         } else if (lsr & CP210X_LSR_PARITY) {
 814                 port->icount.parity++;
 815                 *flag = TTY_PARITY;
 816         } else if (lsr & CP210X_LSR_FRAME) {
 817                 port->icount.frame++;
 818                 *flag = TTY_FRAME;
 819         }
 820
 821         if (lsr & CP210X_LSR_OVERRUN) {
 822                 port->icount.overrun++;
 823                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 824         }
 825 }
 826
 827 static bool cp210x_process_char(struct usb_serial_port *port, unsigned char *ch, char *flag)
 828 {
 829         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 830
 831         switch (port_priv->event_state) {
 832         case ES_DATA:
 833                 if (*ch == CP210X_ESCCHAR) {
 834                         port_priv->event_state = ES_ESCAPE;
 835                         break;
 836                 }
 837                 return false;
 838         case ES_ESCAPE:
 839                 switch (*ch) {
 840                 case 0:
 841                         dev_dbg(&port->dev, "%s - escape char\n", __func__);
 842                         *ch = CP210X_ESCCHAR;
 843                         port_priv->event_state = ES_DATA;
 844                         return false;
 845                 case 1:
 846                         port_priv->event_state = ES_LSR_DATA_0;
 847                         break;
 848                 case 2:
 849                         port_priv->event_state = ES_LSR;
 850                         break;
 851                 case 3:
 852                         port_priv->event_state = ES_MSR;
 853                         break;
 854                 default:
 855                         dev_err(&port->dev, "malformed event 0x%02x\n", *ch);
 856                         port_priv->event_state = ES_DATA;
 857                         break;
 858                 }
 859                 break;
 860         case ES_LSR_DATA_0:
 861                 port_priv->lsr = *ch;
 862                 port_priv->event_state = ES_LSR_DATA_1;
 863                 break;
 864         case ES_LSR_DATA_1:
 865                 dev_dbg(&port->dev, "%s - lsr = 0x%02x, data = 0x%02x\n",
 866                                 __func__, port_priv->lsr, *ch);
 867                 cp210x_process_lsr(port, port_priv->lsr, flag);
 868                 port_priv->event_state = ES_DATA;
 869                 return false;
 870         case ES_LSR:
 871                 dev_dbg(&port->dev, "%s - lsr = 0x%02x\n", __func__, *ch);
 872                 port_priv->lsr = *ch;
 873                 cp210x_process_lsr(port, port_priv->lsr, flag);
 874                 port_priv->event_state = ES_DATA;
 875                 break;
 876         case ES_MSR:
 877                 dev_dbg(&port->dev, "%s - msr = 0x%02x\n", __func__, *ch);
 878                 /* unimplemented */
 879                 port_priv->event_state = ES_DATA;
 880                 break;
 881         }
 882
 883         return true;
 884 }
 885
 886 static void cp210x_process_read_urb(struct urb *urb)
 887 {
 888         struct usb_serial_port *port = urb->context;
 889         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 890         unsigned char *ch = urb->transfer_buffer;
 891         char flag;
 892         int i;
 893
 894         if (!urb->actual_length)
 895                 return;
 896
 897         if (port_priv->event_mode) {
 898                 for (i = 0; i < urb->actual_length; i++, ch++) {
 899                         flag = TTY_NORMAL;
 900
 901                         if (cp210x_process_char(port, ch, &flag))
 902                                 continue;
 903
 904                         tty_insert_flip_char(&port->port, *ch, flag);
 905                 }
 906         } else {
 907                 tty_insert_flip_string(&port->port, ch, urb->actual_length);
 908         }
 909         tty_flip_buffer_push(&port->port);
 910 }
 911
 912 /*
 913  * Read how many bytes are waiting in the TX queue.
 914  */
 915 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 916                 u32 *count)
 917 {
 918         struct usb_serial *serial = port->serial;
 919         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 920         struct cp210x_comm_status sts;
 921         int result;
 922
 923         result = usb_control_msg_recv(serial->dev, 0, CP210X_GET_COMM_STATUS,
 924                         REQTYPE_INTERFACE_TO_HOST, 0,
 925                         port_priv->bInterfaceNumber, &sts, sizeof(sts),
 926                         USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 927         if (result) {
 928                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 929                 return result;
 930         }
 931
 932         *count = le32_to_cpu(sts.ulAmountInOutQueue);
 933
 934         return 0;
 935 }
 936
 937 static bool cp210x_tx_empty(struct usb_serial_port *port)
 938 {
 939         int err;
 940         u32 count;
 941
 942         err = cp210x_get_tx_queue_byte_count(port, &count);
 943         if (err)
 944                 return true;
 945
 946         return !count;
 947 }
 948
 949 struct cp210x_rate {
 950         speed_t rate;
 951         speed_t high;
 952 };
 953
 954 static const struct cp210x_rate cp210x_an205_table1[] = {
 955         { 300, 300 },
 956         { 600, 600 },
 957         { 1200, 1200 },
 958         { 1800, 1800 },
 959         { 2400, 2400 },
 960         { 4000, 4000 },
 961         { 4800, 4803 },
 962         { 7200, 7207 },
 963         { 9600, 9612 },
 964         { 14400, 14428 },
 965         { 16000, 16062 },
 966         { 19200, 19250 },
 967         { 28800, 28912 },
 968         { 38400, 38601 },
 969         { 51200, 51558 },
 970         { 56000, 56280 },
 971         { 57600, 58053 },
 972         { 64000, 64111 },
 973         { 76800, 77608 },
 974         { 115200, 117028 },
 975         { 128000, 129347 },
 976         { 153600, 156868 },
 977         { 230400, 237832 },
 978         { 250000, 254234 },
 979         { 256000, 273066 },
 980         { 460800, 491520 },
 981         { 500000, 567138 },
 982         { 576000, 670254 },
 983         { 921600, UINT_MAX }
 984 };
 985
 986 /*
 987  * Quantises the baud rate as per AN205 Table 1
 988  */
 989 static speed_t cp210x_get_an205_rate(speed_t baud)
 990 {
 991         int i;
 992
 993         for (i = 0; i < ARRAY_SIZE(cp210x_an205_table1); ++i) {
 994                 if (baud <= cp210x_an205_table1[i].high)
 995                         break;
 996         }
 997
 998         return cp210x_an205_table1[i].rate;
 999 }
1000
1001 static speed_t cp210x_get_actual_rate(speed_t baud)
1002 {
1003         unsigned int prescale = 1;
1004         unsigned int div;
1005
1006         if (baud <= 365)
1007                 prescale = 4;
1008
1009         div = DIV_ROUND_CLOSEST(48000000, 2 * prescale * baud);
1010         baud = 48000000 / (2 * prescale * div);
1011
1012         return baud;
1013 }
1014
1015 /*
1016  * CP2101 supports the following baud rates:
1017  *
1018  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1019  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1020  *
1021  * CP2102 and CP2103 support the following additional rates:
1022  *
1023  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1024  *      576000
1025  *
1026  * The device will map a requested rate to a supported one, but the result
1027  * of requests for rates greater than 1053257 is undefined (see AN205).
1028  *
1029  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1030  * respectively, with an error less than 1%. The actual rates are determined
1031  * by
1032  *
1033  *      div = round(freq / (2 x prescale x request))
1034  *      actual = freq / (2 x prescale x div)
1035  *
1036  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1037  * or 1 otherwise.
1038  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1039  * otherwise.
1040  */
1041 static void cp210x_change_speed(struct tty_struct *tty,
1042                 struct usb_serial_port *port, struct ktermios *old_termios)
1043 {
1044         struct usb_serial *serial = port->serial;
1045         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1046         u32 baud;
1047
1048         /*
1049          * This maps the requested rate to the actual rate, a valid rate on
1050          * cp2102 or cp2103, or to an arbitrary rate in [1M, max_speed].
1051          *
1052          * NOTE: B0 is not implemented.
1053          */
1054         baud = clamp(tty->termios.c_ospeed, priv->min_speed, priv->max_speed);
1055
1056         if (priv->use_actual_rate)
1057                 baud = cp210x_get_actual_rate(baud);
1058         else if (baud < 1000000)
1059                 baud = cp210x_get_an205_rate(baud);
1060
1061         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1062         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1063                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1064                 if (old_termios)
1065                         baud = old_termios->c_ospeed;
1066                 else
1067                         baud = 9600;
1068         }
1069
1070         tty_encode_baud_rate(tty, baud, baud);
1071 }
1072
1073 static void cp210x_enable_event_mode(struct usb_serial_port *port)
1074 {
1075         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1076         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1077         int ret;
1078
1079         if (port_priv->event_mode)
1080                 return;
1081
1082         if (priv->no_event_mode)
1083                 return;
1084
1085         port_priv->event_state = ES_DATA;
1086         port_priv->event_mode = true;
1087
1088         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, CP210X_ESCCHAR);
1089         if (ret) {
1090                 dev_err(&port->dev, "failed to enable events: %d\n", ret);
1091                 port_priv->event_mode = false;
1092         }
1093 }
1094
1095 static void cp210x_disable_event_mode(struct usb_serial_port *port)
1096 {
1097         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1098         int ret;
1099
1100         if (!port_priv->event_mode)
1101                 return;
1102
1103         ret = cp210x_write_u16_reg(port, CP210X_EMBED_EVENTS, 0);
1104         if (ret) {
1105                 dev_err(&port->dev, "failed to disable events: %d\n", ret);
1106                 return;
1107         }
1108
1109         port_priv->event_mode = false;
1110 }
1111
1112 static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
1113 {
1114         bool iflag_change, cc_change;
1115
1116         iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
1117         cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
1118                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
1119
1120         return tty_termios_hw_change(a, b) || iflag_change || cc_change;
1121 }
1122
1123 static void cp210x_set_flow_control(struct tty_struct *tty,
1124                 struct usb_serial_port *port, struct ktermios *old_termios)
1125 {
1126         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1127         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1128         struct cp210x_special_chars chars;
1129         struct cp210x_flow_ctl flow_ctl;
1130         u32 flow_repl;
1131         u32 ctl_hs;
1132         bool crtscts;
1133         int ret;
1134
1135         /*
1136          * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
1137          * CP2102N_E104). Report back that flow control is not supported.
1138          */
1139         if (priv->no_flow_control) {
1140                 tty->termios.c_cflag &= ~CRTSCTS;
1141                 tty->termios.c_iflag &= ~(IXON | IXOFF);
1142         }
1143
1144         if (old_termios &&
1145                         C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
1146                         I_IXON(tty) == (old_termios->c_iflag & IXON) &&
1147                         I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
1148                         START_CHAR(tty) == old_termios->c_cc[VSTART] &&
1149                         STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
1150                 return;
1151         }
1152
1153         if (I_IXON(tty) || I_IXOFF(tty)) {
1154                 memset(&chars, 0, sizeof(chars));
1155
1156                 chars.bXonChar = START_CHAR(tty);
1157                 chars.bXoffChar = STOP_CHAR(tty);
1158
1159                 ret = cp210x_write_reg_block(port, CP210X_SET_CHARS, &chars,
1160                                 sizeof(chars));
1161                 if (ret) {
1162                         dev_err(&port->dev, "failed to set special chars: %d\n",
1163                                         ret);
1164                 }
1165         }
1166
1167         mutex_lock(&port_priv->mutex);
1168
1169         ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1170                         sizeof(flow_ctl));
1171         if (ret)
1172                 goto out_unlock;
1173
1174         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1175         flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1176
1177         ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1178         ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1179         ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1180         ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1181         if (port_priv->dtr)
1182                 ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1183         else
1184                 ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1185
1186         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1187         if (C_CRTSCTS(tty)) {
1188                 ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1189                 if (port_priv->rts)
1190                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1191                 else
1192                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1193                 crtscts = true;
1194         } else {
1195                 ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1196                 if (port_priv->rts)
1197                         flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
1198                 else
1199                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1200                 crtscts = false;
1201         }
1202
1203         if (I_IXOFF(tty)) {
1204                 flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
1205
1206                 flow_ctl.ulXonLimit = cpu_to_le32(128);
1207                 flow_ctl.ulXoffLimit = cpu_to_le32(128);
1208         } else {
1209                 flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
1210         }
1211
1212         if (I_IXON(tty))
1213                 flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
1214         else
1215                 flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
1216
1217         dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
1218                         ctl_hs, flow_repl);
1219
1220         flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1221         flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1222
1223         ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1224                         sizeof(flow_ctl));
1225         if (ret)
1226                 goto out_unlock;
1227
1228         port_priv->crtscts = crtscts;
1229 out_unlock:
1230         mutex_unlock(&port_priv->mutex);
1231 }
1232
1233 static void cp210x_set_termios(struct tty_struct *tty,
1234                 struct usb_serial_port *port, struct ktermios *old_termios)
1235 {
1236         struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1237         u16 bits;
1238         int ret;
1239
1240         if (old_termios && !cp210x_termios_change(&tty->termios, old_termios))
1241                 return;
1242
1243         if (!old_termios || tty->termios.c_ospeed != old_termios->c_ospeed)
1244                 cp210x_change_speed(tty, port, old_termios);
1245
1246         /* CP2101 only supports CS8, 1 stop bit and non-stick parity. */
1247         if (priv->partnum == CP210X_PARTNUM_CP2101) {
1248                 tty->termios.c_cflag &= ~(CSIZE | CSTOPB | CMSPAR);
1249                 tty->termios.c_cflag |= CS8;
1250         }
1251
1252         bits = 0;
1253
1254         switch (C_CSIZE(tty)) {
1255         case CS5:
1256                 bits |= BITS_DATA_5;
1257                 break;
1258         case CS6:
1259                 bits |= BITS_DATA_6;
1260                 break;
1261         case CS7:
1262                 bits |= BITS_DATA_7;
1263                 break;
1264         case CS8:
1265         default:
1266                 bits |= BITS_DATA_8;
1267                 break;
1268         }
1269
1270         if (C_PARENB(tty)) {
1271                 if (C_CMSPAR(tty)) {
1272                         if (C_PARODD(tty))
1273                                 bits |= BITS_PARITY_MARK;
1274                         else
1275                                 bits |= BITS_PARITY_SPACE;
1276                 } else {
1277                         if (C_PARODD(tty))
1278                                 bits |= BITS_PARITY_ODD;
1279                         else
1280                                 bits |= BITS_PARITY_EVEN;
1281                 }
1282         }
1283
1284         if (C_CSTOPB(tty))
1285                 bits |= BITS_STOP_2;
1286         else
1287                 bits |= BITS_STOP_1;
1288
1289         ret = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
1290         if (ret)
1291                 dev_err(&port->dev, "failed to set line control: %d\n", ret);
1292
1293         cp210x_set_flow_control(tty, port, old_termios);
1294
1295         /*
1296          * Enable event-insertion mode only if input parity checking is
1297          * enabled for now.
1298          */
1299         if (I_INPCK(tty))
1300                 cp210x_enable_event_mode(port);
1301         else
1302                 cp210x_disable_event_mode(port);
1303 }
1304
1305 static int cp210x_tiocmset(struct tty_struct *tty,
1306                 unsigned int set, unsigned int clear)
1307 {
1308         struct usb_serial_port *port = tty->driver_data;
1309         return cp210x_tiocmset_port(port, set, clear);
1310 }
1311
1312 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1313                 unsigned int set, unsigned int clear)
1314 {
1315         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
1316         struct cp210x_flow_ctl flow_ctl;
1317         u32 ctl_hs, flow_repl;
1318         u16 control = 0;
1319         int ret;
1320
1321         mutex_lock(&port_priv->mutex);
1322
1323         if (set & TIOCM_RTS) {
1324                 port_priv->rts = true;
1325                 control |= CONTROL_RTS;
1326                 control |= CONTROL_WRITE_RTS;
1327         }
1328         if (set & TIOCM_DTR) {
1329                 port_priv->dtr = true;
1330                 control |= CONTROL_DTR;
1331                 control |= CONTROL_WRITE_DTR;
1332         }
1333         if (clear & TIOCM_RTS) {
1334                 port_priv->rts = false;
1335                 control &= ~CONTROL_RTS;
1336                 control |= CONTROL_WRITE_RTS;
1337         }
1338         if (clear & TIOCM_DTR) {
1339                 port_priv->dtr = false;
1340                 control &= ~CONTROL_DTR;
1341                 control |= CONTROL_WRITE_DTR;
1342         }
1343
1344         /*
1345          * Use SET_FLOW to set DTR and enable/disable auto-RTS when hardware
1346          * flow control is enabled.
1347          */
1348         if (port_priv->crtscts && control & CONTROL_WRITE_RTS) {
1349                 ret = cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1350                                 sizeof(flow_ctl));
1351                 if (ret)
1352                         goto out_unlock;
1353
1354                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1355                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1356
1357                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1358                 if (port_priv->dtr)
1359                         ctl_hs |= CP210X_SERIAL_DTR_ACTIVE;
1360                 else
1361                         ctl_hs |= CP210X_SERIAL_DTR_INACTIVE;
1362
1363                 flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1364                 if (port_priv->rts)
1365                         flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
1366                 else
1367                         flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
1368
1369                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1370                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1371
1372                 dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n",
1373                                 __func__, ctl_hs, flow_repl);
1374
1375                 ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1376                                 sizeof(flow_ctl));
1377         } else {
1378                 dev_dbg(&port->dev, "%s - control = 0x%04x\n", __func__, control);
1379
1380                 ret = cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1381         }
1382 out_unlock:
1383         mutex_unlock(&port_priv->mutex);
1384
1385         return ret;
1386 }
1387
1388 static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
1389 {
1390         if (on)
1391                 cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
1392         else
1393                 cp210x_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
1394 }
1395
1396 static int cp210x_tiocmget(struct tty_struct *tty)
1397 {
1398         struct usb_serial_port *port = tty->driver_data;
1399         u8 control;
1400         int result;
1401
1402         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1403         if (result)
1404                 return result;
1405
1406         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1407                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1408                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1409                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1410                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1411                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1412
1413         dev_dbg(&port->dev, "%s - control = 0x%02x\n", __func__, control);
1414
1415         return result;
1416 }
1417
1418 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1419 {
1420         struct usb_serial_port *port = tty->driver_data;
1421         u16 state;
1422
1423         if (break_state == 0)
1424                 state = BREAK_OFF;
1425         else
1426                 state = BREAK_ON;
1427         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1428                 state == BREAK_OFF ? "off" : "on");
1429         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1430 }
1431
1432 #ifdef CONFIG_GPIOLIB
1433 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1434 {
1435         struct usb_serial *serial = gpiochip_get_data(gc);
1436         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1437         u8 req_type;
1438         u16 mask;
1439         int result;
1440         int len;
1441
1442         result = usb_autopm_get_interface(serial->interface);
1443         if (result)
1444                 return result;
1445
1446         switch (priv->partnum) {
1447         case CP210X_PARTNUM_CP2105:
1448                 req_type = REQTYPE_INTERFACE_TO_HOST;
1449                 len = 1;
1450                 break;
1451         case CP210X_PARTNUM_CP2108:
1452                 req_type = REQTYPE_INTERFACE_TO_HOST;
1453                 len = 2;
1454                 break;
1455         default:
1456                 req_type = REQTYPE_DEVICE_TO_HOST;
1457                 len = 1;
1458                 break;
1459         }
1460
1461         mask = 0;
1462         result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
1463                                           &mask, len);
1464
1465         usb_autopm_put_interface(serial->interface);
1466
1467         if (result < 0)
1468                 return result;
1469
1470         le16_to_cpus(&mask);
1471
1472         return !!(mask & BIT(gpio));
1473 }
1474
1475 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1476 {
1477         struct usb_serial *serial = gpiochip_get_data(gc);
1478         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1479         struct cp210x_gpio_write16 buf16;
1480         struct cp210x_gpio_write buf;
1481         u16 mask, state;
1482         u16 wIndex;
1483         int result;
1484
1485         if (value == 1)
1486                 state = BIT(gpio);
1487         else
1488                 state = 0;
1489
1490         mask = BIT(gpio);
1491
1492         result = usb_autopm_get_interface(serial->interface);
1493         if (result)
1494                 goto out;
1495
1496         switch (priv->partnum) {
1497         case CP210X_PARTNUM_CP2105:
1498                 buf.mask = (u8)mask;
1499                 buf.state = (u8)state;
1500                 result = cp210x_write_vendor_block(serial,
1501                                                    REQTYPE_HOST_TO_INTERFACE,
1502                                                    CP210X_WRITE_LATCH, &buf,
1503                                                    sizeof(buf));
1504                 break;
1505         case CP210X_PARTNUM_CP2108:
1506                 buf16.mask = cpu_to_le16(mask);
1507                 buf16.state = cpu_to_le16(state);
1508                 result = cp210x_write_vendor_block(serial,
1509                                                    REQTYPE_HOST_TO_INTERFACE,
1510                                                    CP210X_WRITE_LATCH, &buf16,
1511                                                    sizeof(buf16));
1512                 break;
1513         default:
1514                 wIndex = state << 8 | mask;
1515                 result = usb_control_msg(serial->dev,
1516                                          usb_sndctrlpipe(serial->dev, 0),
1517                                          CP210X_VENDOR_SPECIFIC,
1518                                          REQTYPE_HOST_TO_DEVICE,
1519                                          CP210X_WRITE_LATCH,
1520                                          wIndex,
1521                                          NULL, 0, USB_CTRL_SET_TIMEOUT);
1522                 break;
1523         }
1524
1525         usb_autopm_put_interface(serial->interface);
1526 out:
1527         if (result < 0) {
1528                 dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
1529                                 result);
1530         }
1531 }
1532
1533 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1534 {
1535         struct usb_serial *serial = gpiochip_get_data(gc);
1536         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1537
1538         return priv->gpio_input & BIT(gpio);
1539 }
1540
1541 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1542 {
1543         struct usb_serial *serial = gpiochip_get_data(gc);
1544         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1545
1546         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1547                 /* hardware does not support an input mode */
1548                 return -ENOTSUPP;
1549         }
1550
1551         /* push-pull pins cannot be changed to be inputs */
1552         if (priv->gpio_pushpull & BIT(gpio))
1553                 return -EINVAL;
1554
1555         /* make sure to release pin if it is being driven low */
1556         cp210x_gpio_set(gc, gpio, 1);
1557
1558         priv->gpio_input |= BIT(gpio);
1559
1560         return 0;
1561 }
1562
1563 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1564                                         int value)
1565 {
1566         struct usb_serial *serial = gpiochip_get_data(gc);
1567         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1568
1569         priv->gpio_input &= ~BIT(gpio);
1570         cp210x_gpio_set(gc, gpio, value);
1571
1572         return 0;
1573 }
1574
1575 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1576                                   unsigned long config)
1577 {
1578         struct usb_serial *serial = gpiochip_get_data(gc);
1579         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1580         enum pin_config_param param = pinconf_to_config_param(config);
1581
1582         /* Succeed only if in correct mode (this can't be set at runtime) */
1583         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1584             (priv->gpio_pushpull & BIT(gpio)))
1585                 return 0;
1586
1587         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1588             !(priv->gpio_pushpull & BIT(gpio)))
1589                 return 0;
1590
1591         return -ENOTSUPP;
1592 }
1593
1594 static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
1595                 unsigned long *valid_mask, unsigned int ngpios)
1596 {
1597         struct usb_serial *serial = gpiochip_get_data(gc);
1598         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1599         struct device *dev = &serial->interface->dev;
1600         unsigned long altfunc_mask = priv->gpio_altfunc;
1601
1602         bitmap_complement(valid_mask, &altfunc_mask, ngpios);
1603
1604         if (bitmap_empty(valid_mask, ngpios))
1605                 dev_dbg(dev, "no pin configured for GPIO\n");
1606         else
1607                 dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
1608                                 valid_mask);
1609         return 0;
1610 }
1611
1612 /*
1613  * This function is for configuring GPIO using shared pins, where other signals
1614  * are made unavailable by configuring the use of GPIO. This is believed to be
1615  * only applicable to the cp2105 at this point, the other devices supported by
1616  * this driver that provide GPIO do so in a way that does not impact other
1617  * signals and are thus expected to have very different initialisation.
1618  */
1619 static int cp2105_gpioconf_init(struct usb_serial *serial)
1620 {
1621         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1622         struct cp210x_pin_mode mode;
1623         struct cp210x_dual_port_config config;
1624         u8 intf_num = cp210x_interface_num(serial);
1625         u8 iface_config;
1626         int result;
1627
1628         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1629                                           CP210X_GET_DEVICEMODE, &mode,
1630                                           sizeof(mode));
1631         if (result < 0)
1632                 return result;
1633
1634         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1635                                           CP210X_GET_PORTCONFIG, &config,
1636                                           sizeof(config));
1637         if (result < 0)
1638                 return result;
1639
1640         /*  2 banks of GPIO - One for the pins taken from each serial port */
1641         if (intf_num == 0) {
1642                 priv->gc.ngpio = 2;
1643
1644                 if (mode.eci == CP210X_PIN_MODE_MODEM) {
1645                         /* mark all GPIOs of this interface as reserved */
1646                         priv->gpio_altfunc = 0xff;
1647                         return 0;
1648                 }
1649
1650                 iface_config = config.eci_cfg;
1651                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1652                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1653                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1654         } else if (intf_num == 1) {
1655                 priv->gc.ngpio = 3;
1656
1657                 if (mode.sci == CP210X_PIN_MODE_MODEM) {
1658                         /* mark all GPIOs of this interface as reserved */
1659                         priv->gpio_altfunc = 0xff;
1660                         return 0;
1661                 }
1662
1663                 iface_config = config.sci_cfg;
1664                 priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1665                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1666                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1667         } else {
1668                 return -ENODEV;
1669         }
1670
1671         /* mark all pins which are not in GPIO mode */
1672         if (iface_config & CP2105_GPIO0_TXLED_MODE)     /* GPIO 0 */
1673                 priv->gpio_altfunc |= BIT(0);
1674         if (iface_config & (CP2105_GPIO1_RXLED_MODE |   /* GPIO 1 */
1675                         CP2105_GPIO1_RS485_MODE))
1676                 priv->gpio_altfunc |= BIT(1);
1677
1678         /* driver implementation for CP2105 only supports outputs */
1679         priv->gpio_input = 0;
1680
1681         return 0;
1682 }
1683
1684 static int cp2104_gpioconf_init(struct usb_serial *serial)
1685 {
1686         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1687         struct cp210x_single_port_config config;
1688         u8 iface_config;
1689         u8 gpio_latch;
1690         int result;
1691         u8 i;
1692
1693         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1694                                           CP210X_GET_PORTCONFIG, &config,
1695                                           sizeof(config));
1696         if (result < 0)
1697                 return result;
1698
1699         priv->gc.ngpio = 4;
1700
1701         iface_config = config.device_cfg;
1702         priv->gpio_pushpull = (u8)((le16_to_cpu(config.gpio_mode) &
1703                                         CP210X_GPIO_MODE_MASK) >>
1704                                         CP210X_GPIO_MODE_OFFSET);
1705         gpio_latch = (u8)((le16_to_cpu(config.reset_state) &
1706                                         CP210X_GPIO_MODE_MASK) >>
1707                                         CP210X_GPIO_MODE_OFFSET);
1708
1709         /* mark all pins which are not in GPIO mode */
1710         if (iface_config & CP2104_GPIO0_TXLED_MODE)     /* GPIO 0 */
1711                 priv->gpio_altfunc |= BIT(0);
1712         if (iface_config & CP2104_GPIO1_RXLED_MODE)     /* GPIO 1 */
1713                 priv->gpio_altfunc |= BIT(1);
1714         if (iface_config & CP2104_GPIO2_RS485_MODE)     /* GPIO 2 */
1715                 priv->gpio_altfunc |= BIT(2);
1716
1717         /*
1718          * Like CP2102N, CP2104 has also no strict input and output pin
1719          * modes.
1720          * Do the same input mode emulation as CP2102N.
1721          */
1722         for (i = 0; i < priv->gc.ngpio; ++i) {
1723                 /*
1724                  * Set direction to "input" iff pin is open-drain and reset
1725                  * value is 1.
1726                  */
1727                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1728                         priv->gpio_input |= BIT(i);
1729         }
1730
1731         return 0;
1732 }
1733
1734 static int cp2108_gpio_init(struct usb_serial *serial)
1735 {
1736         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1737         struct cp210x_quad_port_config config;
1738         u16 gpio_latch;
1739         int result;
1740         u8 i;
1741
1742         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1743                                           CP210X_GET_PORTCONFIG, &config,
1744                                           sizeof(config));
1745         if (result < 0)
1746                 return result;
1747
1748         priv->gc.ngpio = 16;
1749         priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
1750         gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
1751
1752         /*
1753          * Mark all pins which are not in GPIO mode.
1754          *
1755          * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
1756          * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
1757          *
1758          * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
1759          * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
1760          * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
1761          */
1762         for (i = 0; i < 4; i++) {
1763                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
1764                         priv->gpio_altfunc |= BIT(i * 4);
1765                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
1766                         priv->gpio_altfunc |= BIT((i * 4) + 1);
1767                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
1768                         priv->gpio_altfunc |= BIT((i * 4) + 2);
1769                 if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
1770                         priv->gpio_altfunc |= BIT((i * 4) + 3);
1771         }
1772
1773         /*
1774          * Like CP2102N, CP2108 has also no strict input and output pin
1775          * modes. Do the same input mode emulation as CP2102N.
1776          */
1777         for (i = 0; i < priv->gc.ngpio; ++i) {
1778                 /*
1779                  * Set direction to "input" iff pin is open-drain and reset
1780                  * value is 1.
1781                  */
1782                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1783                         priv->gpio_input |= BIT(i);
1784         }
1785
1786         return 0;
1787 }
1788
1789 static int cp2102n_gpioconf_init(struct usb_serial *serial)
1790 {
1791         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1792         const u16 config_size = 0x02a6;
1793         u8 gpio_rst_latch;
1794         u8 config_version;
1795         u8 gpio_pushpull;
1796         u8 *config_buf;
1797         u8 gpio_latch;
1798         u8 gpio_ctrl;
1799         int result;
1800         u8 i;
1801
1802         /*
1803          * Retrieve device configuration from the device.
1804          * The array received contains all customization settings done at the
1805          * factory/manufacturer. Format of the array is documented at the
1806          * time of writing at:
1807          * https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/03/31/cp2102n_setconfig-xsfa
1808          */
1809         config_buf = kmalloc(config_size, GFP_KERNEL);
1810         if (!config_buf)
1811                 return -ENOMEM;
1812
1813         result = cp210x_read_vendor_block(serial,
1814                                           REQTYPE_DEVICE_TO_HOST,
1815                                           CP210X_READ_2NCONFIG,
1816                                           config_buf,
1817                                           config_size);
1818         if (result < 0) {
1819                 kfree(config_buf);
1820                 return result;
1821         }
1822
1823         config_version = config_buf[CP210X_2NCONFIG_CONFIG_VERSION_IDX];
1824         gpio_pushpull = config_buf[CP210X_2NCONFIG_GPIO_MODE_IDX];
1825         gpio_ctrl = config_buf[CP210X_2NCONFIG_GPIO_CONTROL_IDX];
1826         gpio_rst_latch = config_buf[CP210X_2NCONFIG_GPIO_RSTLATCH_IDX];
1827
1828         kfree(config_buf);
1829
1830         /* Make sure this is a config format we understand. */
1831         if (config_version != 0x01)
1832                 return -ENOTSUPP;
1833
1834         priv->gc.ngpio = 4;
1835
1836         /*
1837          * Get default pin states after reset. Needed so we can determine
1838          * the direction of an open-drain pin.
1839          */
1840         gpio_latch = (gpio_rst_latch >> 3) & 0x0f;
1841
1842         /* 0 indicates open-drain mode, 1 is push-pull */
1843         priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
1844
1845         /* 0 indicates GPIO mode, 1 is alternate function */
1846         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
1847                 /* QFN20 is special... */
1848                 if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
1849                         priv->gpio_altfunc |= BIT(0);
1850                 if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
1851                         priv->gpio_altfunc |= BIT(1);
1852                 if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
1853                         priv->gpio_altfunc |= BIT(2);
1854                 if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
1855                         priv->gpio_altfunc |= BIT(3);
1856         } else {
1857                 priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
1858         }
1859
1860         if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
1861                 /*
1862                  * For the QFN28 package, GPIO4-6 are controlled by
1863                  * the low three bits of the mode/latch fields.
1864                  * Contrary to the document linked above, the bits for
1865                  * the SUSPEND pins are elsewhere.  No alternate
1866                  * function is available for these pins.
1867                  */
1868                 priv->gc.ngpio = 7;
1869                 gpio_latch |= (gpio_rst_latch & 7) << 4;
1870                 priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;
1871         }
1872
1873         /*
1874          * The CP2102N does not strictly has input and output pin modes,
1875          * it only knows open-drain and push-pull modes which is set at
1876          * factory. An open-drain pin can function both as an
1877          * input or an output. We emulate input mode for open-drain pins
1878          * by making sure they are not driven low, and we do not allow
1879          * push-pull pins to be set as an input.
1880          */
1881         for (i = 0; i < priv->gc.ngpio; ++i) {
1882                 /*
1883                  * Set direction to "input" iff pin is open-drain and reset
1884                  * value is 1.
1885                  */
1886                 if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
1887                         priv->gpio_input |= BIT(i);
1888         }
1889
1890         return 0;
1891 }
1892
1893 static int cp210x_gpio_init(struct usb_serial *serial)
1894 {
1895         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1896         int result;
1897
1898         switch (priv->partnum) {
1899         case CP210X_PARTNUM_CP2104:
1900                 result = cp2104_gpioconf_init(serial);
1901                 break;
1902         case CP210X_PARTNUM_CP2105:
1903                 result = cp2105_gpioconf_init(serial);
1904                 break;
1905         case CP210X_PARTNUM_CP2108:
1906                 /*
1907                  * The GPIOs are not tied to any specific port so only register
1908                  * once for interface 0.
1909                  */
1910                 if (cp210x_interface_num(serial) != 0)
1911                         return 0;
1912                 result = cp2108_gpio_init(serial);
1913                 break;
1914         case CP210X_PARTNUM_CP2102N_QFN28:
1915         case CP210X_PARTNUM_CP2102N_QFN24:
1916         case CP210X_PARTNUM_CP2102N_QFN20:
1917                 result = cp2102n_gpioconf_init(serial);
1918                 break;
1919         default:
1920                 return 0;
1921         }
1922
1923         if (result < 0)
1924                 return result;
1925
1926         priv->gc.label = "cp210x";
1927         priv->gc.get_direction = cp210x_gpio_direction_get;
1928         priv->gc.direction_input = cp210x_gpio_direction_input;
1929         priv->gc.direction_output = cp210x_gpio_direction_output;
1930         priv->gc.get = cp210x_gpio_get;
1931         priv->gc.set = cp210x_gpio_set;
1932         priv->gc.set_config = cp210x_gpio_set_config;
1933         priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
1934         priv->gc.owner = THIS_MODULE;
1935         priv->gc.parent = &serial->interface->dev;
1936         priv->gc.base = -1;
1937         priv->gc.can_sleep = true;
1938
1939         result = gpiochip_add_data(&priv->gc, serial);
1940         if (!result)
1941                 priv->gpio_registered = true;
1942
1943         return result;
1944 }
1945
1946 static void cp210x_gpio_remove(struct usb_serial *serial)
1947 {
1948         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1949
1950         if (priv->gpio_registered) {
1951                 gpiochip_remove(&priv->gc);
1952                 priv->gpio_registered = false;
1953         }
1954 }
1955
1956 #else
1957
1958 static int cp210x_gpio_init(struct usb_serial *serial)
1959 {
1960         return 0;
1961 }
1962
1963 static void cp210x_gpio_remove(struct usb_serial *serial)
1964 {
1965         /* Nothing to do */
1966 }
1967
1968 #endif
1969
1970 static int cp210x_port_probe(struct usb_serial_port *port)
1971 {
1972         struct usb_serial *serial = port->serial;
1973         struct cp210x_port_private *port_priv;
1974
1975         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1976         if (!port_priv)
1977                 return -ENOMEM;
1978
1979         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1980         mutex_init(&port_priv->mutex);
1981
1982         usb_set_serial_port_data(port, port_priv);
1983
1984         return 0;
1985 }
1986
1987 static void cp210x_port_remove(struct usb_serial_port *port)
1988 {
1989         struct cp210x_port_private *port_priv;
1990
1991         port_priv = usb_get_serial_port_data(port);
1992         kfree(port_priv);
1993 }
1994
1995 static void cp210x_init_max_speed(struct usb_serial *serial)
1996 {
1997         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1998         bool use_actual_rate = false;
1999         speed_t min = 300;
2000         speed_t max;
2001
2002         switch (priv->partnum) {
2003         case CP210X_PARTNUM_CP2101:
2004                 max = 921600;
2005                 break;
2006         case CP210X_PARTNUM_CP2102:
2007         case CP210X_PARTNUM_CP2103:
2008                 max = 1000000;
2009                 break;
2010         case CP210X_PARTNUM_CP2104:
2011                 use_actual_rate = true;
2012                 max = 2000000;
2013                 break;
2014         case CP210X_PARTNUM_CP2108:
2015                 max = 2000000;
2016                 break;
2017         case CP210X_PARTNUM_CP2105:
2018                 if (cp210x_interface_num(serial) == 0) {
2019                         use_actual_rate = true;
2020                         max = 2000000;  /* ECI */
2021                 } else {
2022                         min = 2400;
2023                         max = 921600;   /* SCI */
2024                 }
2025                 break;
2026         case CP210X_PARTNUM_CP2102N_QFN28:
2027         case CP210X_PARTNUM_CP2102N_QFN24:
2028         case CP210X_PARTNUM_CP2102N_QFN20:
2029                 use_actual_rate = true;
2030                 max = 3000000;
2031                 break;
2032         default:
2033                 max = 2000000;
2034                 break;
2035         }
2036
2037         priv->min_speed = min;
2038         priv->max_speed = max;
2039         priv->use_actual_rate = use_actual_rate;
2040 }
2041
2042 static void cp2102_determine_quirks(struct usb_serial *serial)
2043 {
2044         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2045         u8 *buf;
2046         int ret;
2047
2048         buf = kmalloc(2, GFP_KERNEL);
2049         if (!buf)
2050                 return;
2051         /*
2052          * Some (possibly counterfeit) CP2102 do not support event-insertion
2053          * mode and respond differently to malformed vendor requests.
2054          * Specifically, they return one instead of two bytes when sent a
2055          * two-byte part-number request.
2056          */
2057         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2058                         CP210X_VENDOR_SPECIFIC, REQTYPE_DEVICE_TO_HOST,
2059                         CP210X_GET_PARTNUM, 0, buf, 2, USB_CTRL_GET_TIMEOUT);
2060         if (ret == 1) {
2061                 dev_dbg(&serial->interface->dev,
2062                                 "device does not support event-insertion mode\n");
2063                 priv->no_event_mode = true;
2064         }
2065
2066         kfree(buf);
2067 }
2068
2069 static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
2070 {
2071         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2072         u8 ver[3];
2073         int ret;
2074
2075         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
2076                         ver, sizeof(ver));
2077         if (ret)
2078                 return ret;
2079
2080         dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
2081                         ver[0], ver[1], ver[2]);
2082
2083         priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
2084
2085         return 0;
2086 }
2087
2088 static void cp210x_determine_type(struct usb_serial *serial)
2089 {
2090         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2091         int ret;
2092
2093         ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
2094                         CP210X_GET_PARTNUM, &priv->partnum,
2095                         sizeof(priv->partnum));
2096         if (ret < 0) {
2097                 dev_warn(&serial->interface->dev,
2098                                 "querying part number failed\n");
2099                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
2100                 return;
2101         }
2102
2103         dev_dbg(&serial->interface->dev, "partnum = 0x%02x\n", priv->partnum);
2104
2105         switch (priv->partnum) {
2106         case CP210X_PARTNUM_CP2102:
2107                 cp2102_determine_quirks(serial);
2108                 break;
2109         case CP210X_PARTNUM_CP2105:
2110         case CP210X_PARTNUM_CP2108:
2111                 cp210x_get_fw_version(serial, CP210X_GET_FW_VER);
2112                 break;
2113         case CP210X_PARTNUM_CP2102N_QFN28:
2114         case CP210X_PARTNUM_CP2102N_QFN24:
2115         case CP210X_PARTNUM_CP2102N_QFN20:
2116                 ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
2117                 if (ret)
2118                         break;
2119                 if (priv->fw_version <= 0x10004)
2120                         priv->no_flow_control = true;
2121                 break;
2122         default:
2123                 break;
2124         }
2125 }
2126
2127 static int cp210x_attach(struct usb_serial *serial)
2128 {
2129         int result;
2130         struct cp210x_serial_private *priv;
2131
2132         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2133         if (!priv)
2134                 return -ENOMEM;
2135
2136         usb_set_serial_data(serial, priv);
2137
2138         cp210x_determine_type(serial);
2139         cp210x_init_max_speed(serial);
2140
2141         result = cp210x_gpio_init(serial);
2142         if (result < 0) {
2143                 dev_err(&serial->interface->dev, "GPIO initialisation failed: %d\n",
2144                                 result);
2145         }
2146
2147         return 0;
2148 }
2149
2150 static void cp210x_disconnect(struct usb_serial *serial)
2151 {
2152         cp210x_gpio_remove(serial);
2153 }
2154
2155 static void cp210x_release(struct usb_serial *serial)
2156 {
2157         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
2158
2159         cp210x_gpio_remove(serial);
2160
2161         kfree(priv);
2162 }
2163
2164 module_usb_serial_driver(serial_drivers, id_table);
2165
2166 MODULE_DESCRIPTION(DRIVER_DESC);
2167 MODULE_LICENSE("GPL v2");