drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/usb.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb/serial.h>
  26
  27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  28
  29 /*
  30  * Function Prototypes
  31  */
  32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  33 static void cp210x_close(struct usb_serial_port *);
  34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  35 static void cp210x_get_termios_port(struct usb_serial_port *port,
  36         unsigned int *cflagp, unsigned int *baudp);
  37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  38                                                         struct ktermios *);
  39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  40                                                         struct ktermios*);
  41 static bool cp210x_tx_empty(struct usb_serial_port *port);
  42 static int cp210x_tiocmget(struct tty_struct *);
  43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  44 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  45                 unsigned int, unsigned int);
  46 static void cp210x_break_ctl(struct tty_struct *, int);
  47 static int cp210x_port_probe(struct usb_serial_port *);
  48 static int cp210x_port_remove(struct usb_serial_port *);
  49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  50
  51 static const struct usb_device_id id_table[] = {
  52         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  53         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  54         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  55         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  56         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  57         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  58         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  59         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  60         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  61         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  62         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  63         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  65         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  66         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  67         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  68         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  69         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  70         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  71         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  72         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  73         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  74         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  75         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  76         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  77         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  78         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  79         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  80         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  81         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  82         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  83         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  84         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  85         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  86         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  87         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  88         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  89         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  90         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  91         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  92         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  93         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  94         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
  95         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  96         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  97         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  98         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
  99         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 100         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 101         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 102         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 103         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 104         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 105         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 106         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 107         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 108         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 109         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 110         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 111         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 112         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 113         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 114         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 115         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 116         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 117         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 118         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 119         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 120         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 121         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 122         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 123         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 124         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 125         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 126         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 127         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 128         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 129         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 130         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 131         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 132         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 133         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 134         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 135         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 136         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 137         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 138         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 139         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 140         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 141         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 142         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 143         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 144         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 145         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 146         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 147         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 148         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 149         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 150         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 151         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 152         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 153         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 154         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 155         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 156         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 157         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 158         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 159         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 160         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 161         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 162         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 163         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 164         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 165         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 166         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 167         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 168         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 169         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 170         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 171         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 172         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 173         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 174         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 175         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 176         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 177         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 178         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 179         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 180         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 181         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 182         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 183         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 184         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 185         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 186         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 187         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 188         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 189         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 190         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 191         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 192         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 193         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 194         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 195         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 196         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 197         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 198         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 199         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 200         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 201         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 202         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 203         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 204         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 205         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 206         { } /* Terminating Entry */
 207 };
 208
 209 MODULE_DEVICE_TABLE(usb, id_table);
 210
 211 struct cp210x_port_private {
 212         __u8                    bInterfaceNumber;
 213         bool                    has_swapped_line_ctl;
 214 };
 215
 216 static struct usb_serial_driver cp210x_device = {
 217         .driver = {
 218                 .owner =        THIS_MODULE,
 219                 .name =         "cp210x",
 220         },
 221         .id_table               = id_table,
 222         .num_ports              = 1,
 223         .bulk_in_size           = 256,
 224         .bulk_out_size          = 256,
 225         .open                   = cp210x_open,
 226         .close                  = cp210x_close,
 227         .break_ctl              = cp210x_break_ctl,
 228         .set_termios            = cp210x_set_termios,
 229         .tx_empty               = cp210x_tx_empty,
 230         .tiocmget               = cp210x_tiocmget,
 231         .tiocmset               = cp210x_tiocmset,
 232         .port_probe             = cp210x_port_probe,
 233         .port_remove            = cp210x_port_remove,
 234         .dtr_rts                = cp210x_dtr_rts
 235 };
 236
 237 static struct usb_serial_driver * const serial_drivers[] = {
 238         &cp210x_device, NULL
 239 };
 240
 241 /* Config request types */
 242 #define REQTYPE_HOST_TO_INTERFACE       0x41
 243 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 244 #define REQTYPE_HOST_TO_DEVICE  0x40
 245 #define REQTYPE_DEVICE_TO_HOST  0xc0
 246
 247 /* Config request codes */
 248 #define CP210X_IFC_ENABLE       0x00
 249 #define CP210X_SET_BAUDDIV      0x01
 250 #define CP210X_GET_BAUDDIV      0x02
 251 #define CP210X_SET_LINE_CTL     0x03
 252 #define CP210X_GET_LINE_CTL     0x04
 253 #define CP210X_SET_BREAK        0x05
 254 #define CP210X_IMM_CHAR         0x06
 255 #define CP210X_SET_MHS          0x07
 256 #define CP210X_GET_MDMSTS       0x08
 257 #define CP210X_SET_XON          0x09
 258 #define CP210X_SET_XOFF         0x0A
 259 #define CP210X_SET_EVENTMASK    0x0B
 260 #define CP210X_GET_EVENTMASK    0x0C
 261 #define CP210X_SET_CHAR         0x0D
 262 #define CP210X_GET_CHARS        0x0E
 263 #define CP210X_GET_PROPS        0x0F
 264 #define CP210X_GET_COMM_STATUS  0x10
 265 #define CP210X_RESET            0x11
 266 #define CP210X_PURGE            0x12
 267 #define CP210X_SET_FLOW         0x13
 268 #define CP210X_GET_FLOW         0x14
 269 #define CP210X_EMBED_EVENTS     0x15
 270 #define CP210X_GET_EVENTSTATE   0x16
 271 #define CP210X_SET_CHARS        0x19
 272 #define CP210X_GET_BAUDRATE     0x1D
 273 #define CP210X_SET_BAUDRATE     0x1E
 274
 275 /* CP210X_IFC_ENABLE */
 276 #define UART_ENABLE             0x0001
 277 #define UART_DISABLE            0x0000
 278
 279 /* CP210X_(SET|GET)_BAUDDIV */
 280 #define BAUD_RATE_GEN_FREQ      0x384000
 281
 282 /* CP210X_(SET|GET)_LINE_CTL */
 283 #define BITS_DATA_MASK          0X0f00
 284 #define BITS_DATA_5             0X0500
 285 #define BITS_DATA_6             0X0600
 286 #define BITS_DATA_7             0X0700
 287 #define BITS_DATA_8             0X0800
 288 #define BITS_DATA_9             0X0900
 289
 290 #define BITS_PARITY_MASK        0x00f0
 291 #define BITS_PARITY_NONE        0x0000
 292 #define BITS_PARITY_ODD         0x0010
 293 #define BITS_PARITY_EVEN        0x0020
 294 #define BITS_PARITY_MARK        0x0030
 295 #define BITS_PARITY_SPACE       0x0040
 296
 297 #define BITS_STOP_MASK          0x000f
 298 #define BITS_STOP_1             0x0000
 299 #define BITS_STOP_1_5           0x0001
 300 #define BITS_STOP_2             0x0002
 301
 302 /* CP210X_SET_BREAK */
 303 #define BREAK_ON                0x0001
 304 #define BREAK_OFF               0x0000
 305
 306 /* CP210X_(SET_MHS|GET_MDMSTS) */
 307 #define CONTROL_DTR             0x0001
 308 #define CONTROL_RTS             0x0002
 309 #define CONTROL_CTS             0x0010
 310 #define CONTROL_DSR             0x0020
 311 #define CONTROL_RING            0x0040
 312 #define CONTROL_DCD             0x0080
 313 #define CONTROL_WRITE_DTR       0x0100
 314 #define CONTROL_WRITE_RTS       0x0200
 315
 316 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 317 struct cp210x_comm_status {
 318         __le32   ulErrors;
 319         __le32   ulHoldReasons;
 320         __le32   ulAmountInInQueue;
 321         __le32   ulAmountInOutQueue;
 322         u8       bEofReceived;
 323         u8       bWaitForImmediate;
 324         u8       bReserved;
 325 } __packed;
 326
 327 /*
 328  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 329  * SiLabs app note AN571 gives a strange description of the 4 bits:
 330  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 331  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 332  */
 333 #define PURGE_ALL               0x000f
 334
 335 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 336 struct cp210x_flow_ctl {
 337         __le32  ulControlHandshake;
 338         __le32  ulFlowReplace;
 339         __le32  ulXonLimit;
 340         __le32  ulXoffLimit;
 341 } __packed;
 342
 343 /* cp210x_flow_ctl::ulControlHandshake */
 344 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 345 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 346 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 347 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 348 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 349 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 350
 351 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 352 #define CP210X_SERIAL_DTR_INACTIVE      0
 353 #define CP210X_SERIAL_DTR_ACTIVE        1
 354 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 355
 356 /* cp210x_flow_ctl::ulFlowReplace */
 357 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 358 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 359 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 360 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 361 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 362 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 363 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 364 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 365
 366 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 367 #define CP210X_SERIAL_RTS_INACTIVE      0
 368 #define CP210X_SERIAL_RTS_ACTIVE        1
 369 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 370
 371 /*
 372  * Reads a variable-sized block of CP210X_ registers, identified by req.
 373  * Returns data into buf in native USB byte order.
 374  */
 375 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 376                 void *buf, int bufsize)
 377 {
 378         struct usb_serial *serial = port->serial;
 379         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 380         void *dmabuf;
 381         int result;
 382
 383         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 384         if (!dmabuf) {
 385                 /*
 386                  * FIXME Some callers don't bother to check for error,
 387                  * at least give them consistent junk until they are fixed
 388                  */
 389                 memset(buf, 0, bufsize);
 390                 return -ENOMEM;
 391         }
 392
 393         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 394                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 395                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 396                         USB_CTRL_SET_TIMEOUT);
 397         if (result == bufsize) {
 398                 memcpy(buf, dmabuf, bufsize);
 399                 result = 0;
 400         } else {
 401                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 402                                 req, bufsize, result);
 403                 if (result >= 0)
 404                         result = -EPROTO;
 405
 406                 /*
 407                  * FIXME Some callers don't bother to check for error,
 408                  * at least give them consistent junk until they are fixed
 409                  */
 410                 memset(buf, 0, bufsize);
 411         }
 412
 413         kfree(dmabuf);
 414
 415         return result;
 416 }
 417
 418 /*
 419  * Reads any 32-bit CP210X_ register identified by req.
 420  */
 421 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 422 {
 423         __le32 le32_val;
 424         int err;
 425
 426         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 427         if (err) {
 428                 /*
 429                  * FIXME Some callers don't bother to check for error,
 430                  * at least give them consistent junk until they are fixed
 431                  */
 432                 *val = 0;
 433                 return err;
 434         }
 435
 436         *val = le32_to_cpu(le32_val);
 437
 438         return 0;
 439 }
 440
 441 /*
 442  * Reads any 16-bit CP210X_ register identified by req.
 443  */
 444 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 445 {
 446         __le16 le16_val;
 447         int err;
 448
 449         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 450         if (err)
 451                 return err;
 452
 453         *val = le16_to_cpu(le16_val);
 454
 455         return 0;
 456 }
 457
 458 /*
 459  * Reads any 8-bit CP210X_ register identified by req.
 460  */
 461 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 462 {
 463         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 464 }
 465
 466 /*
 467  * Writes any 16-bit CP210X_ register (req) whose value is passed
 468  * entirely in the wValue field of the USB request.
 469  */
 470 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 471 {
 472         struct usb_serial *serial = port->serial;
 473         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 474         int result;
 475
 476         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 477                         req, REQTYPE_HOST_TO_INTERFACE, val,
 478                         port_priv->bInterfaceNumber, NULL, 0,
 479                         USB_CTRL_SET_TIMEOUT);
 480         if (result < 0) {
 481                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 482                                 req, result);
 483         }
 484
 485         return result;
 486 }
 487
 488 /*
 489  * Writes a variable-sized block of CP210X_ registers, identified by req.
 490  * Data in buf must be in native USB byte order.
 491  */
 492 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 493                 void *buf, int bufsize)
 494 {
 495         struct usb_serial *serial = port->serial;
 496         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 497         void *dmabuf;
 498         int result;
 499
 500         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 501         if (!dmabuf)
 502                 return -ENOMEM;
 503
 504         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 505                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 506                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 507                         USB_CTRL_SET_TIMEOUT);
 508
 509         kfree(dmabuf);
 510
 511         if (result == bufsize) {
 512                 result = 0;
 513         } else {
 514                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 515                                 req, bufsize, result);
 516                 if (result >= 0)
 517                         result = -EPROTO;
 518         }
 519
 520         return result;
 521 }
 522
 523 /*
 524  * Writes any 32-bit CP210X_ register identified by req.
 525  */
 526 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 527 {
 528         __le32 le32_val;
 529
 530         le32_val = cpu_to_le32(val);
 531
 532         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 533 }
 534
 535 /*
 536  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 537  * Write a known good value 0x800, read it back.
 538  * If it comes back swapped the bug is detected.
 539  * Preserve the original register value.
 540  */
 541 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 542 {
 543         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 544         u16 line_ctl_save;
 545         u16 line_ctl_test;
 546         int err;
 547
 548         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 549         if (err)
 550                 return err;
 551
 552         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 553         if (err)
 554                 return err;
 555
 556         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 557         if (err)
 558                 return err;
 559
 560         if (line_ctl_test == 8) {
 561                 port_priv->has_swapped_line_ctl = true;
 562                 line_ctl_save = swab16(line_ctl_save);
 563         }
 564
 565         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 566 }
 567
 568 /*
 569  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 570  * to workaround cp2108 bug and get correct value.
 571  */
 572 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 573 {
 574         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 575         int err;
 576
 577         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 578         if (err)
 579                 return err;
 580
 581         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 582         if (port_priv->has_swapped_line_ctl)
 583                 *ctl = swab16(*ctl);
 584
 585         return 0;
 586 }
 587
 588 /*
 589  * cp210x_quantise_baudrate
 590  * Quantises the baud rate as per AN205 Table 1
 591  */
 592 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 593 {
 594         if (baud <= 300)
 595                 baud = 300;
 596         else if (baud <= 600)      baud = 600;
 597         else if (baud <= 1200)     baud = 1200;
 598         else if (baud <= 1800)     baud = 1800;
 599         else if (baud <= 2400)     baud = 2400;
 600         else if (baud <= 4000)     baud = 4000;
 601         else if (baud <= 4803)     baud = 4800;
 602         else if (baud <= 7207)     baud = 7200;
 603         else if (baud <= 9612)     baud = 9600;
 604         else if (baud <= 14428)    baud = 14400;
 605         else if (baud <= 16062)    baud = 16000;
 606         else if (baud <= 19250)    baud = 19200;
 607         else if (baud <= 28912)    baud = 28800;
 608         else if (baud <= 38601)    baud = 38400;
 609         else if (baud <= 51558)    baud = 51200;
 610         else if (baud <= 56280)    baud = 56000;
 611         else if (baud <= 58053)    baud = 57600;
 612         else if (baud <= 64111)    baud = 64000;
 613         else if (baud <= 77608)    baud = 76800;
 614         else if (baud <= 117028)   baud = 115200;
 615         else if (baud <= 129347)   baud = 128000;
 616         else if (baud <= 156868)   baud = 153600;
 617         else if (baud <= 237832)   baud = 230400;
 618         else if (baud <= 254234)   baud = 250000;
 619         else if (baud <= 273066)   baud = 256000;
 620         else if (baud <= 491520)   baud = 460800;
 621         else if (baud <= 567138)   baud = 500000;
 622         else if (baud <= 670254)   baud = 576000;
 623         else if (baud < 1000000)
 624                 baud = 921600;
 625         else if (baud > 2000000)
 626                 baud = 2000000;
 627         return baud;
 628 }
 629
 630 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 631 {
 632         int result;
 633
 634         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 635         if (result) {
 636                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 637                 return result;
 638         }
 639
 640         /* Configure the termios structure */
 641         cp210x_get_termios(tty, port);
 642
 643         /* The baud rate must be initialised on cp2104 */
 644         if (tty)
 645                 cp210x_change_speed(tty, port, NULL);
 646
 647         return usb_serial_generic_open(tty, port);
 648 }
 649
 650 static void cp210x_close(struct usb_serial_port *port)
 651 {
 652         usb_serial_generic_close(port);
 653
 654         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 655         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 656
 657         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 658 }
 659
 660 /*
 661  * Read how many bytes are waiting in the TX queue.
 662  */
 663 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 664                 u32 *count)
 665 {
 666         struct usb_serial *serial = port->serial;
 667         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 668         struct cp210x_comm_status *sts;
 669         int result;
 670
 671         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 672         if (!sts)
 673                 return -ENOMEM;
 674
 675         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 676                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 677                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 678                         USB_CTRL_GET_TIMEOUT);
 679         if (result == sizeof(*sts)) {
 680                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 681                 result = 0;
 682         } else {
 683                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 684                 if (result >= 0)
 685                         result = -EPROTO;
 686         }
 687
 688         kfree(sts);
 689
 690         return result;
 691 }
 692
 693 static bool cp210x_tx_empty(struct usb_serial_port *port)
 694 {
 695         int err;
 696         u32 count;
 697
 698         err = cp210x_get_tx_queue_byte_count(port, &count);
 699         if (err)
 700                 return true;
 701
 702         return !count;
 703 }
 704
 705 /*
 706  * cp210x_get_termios
 707  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 708  * from the device, corrects any unsupported values, and configures the
 709  * termios structure to reflect the state of the device
 710  */
 711 static void cp210x_get_termios(struct tty_struct *tty,
 712         struct usb_serial_port *port)
 713 {
 714         unsigned int baud;
 715
 716         if (tty) {
 717                 cp210x_get_termios_port(tty->driver_data,
 718                         &tty->termios.c_cflag, &baud);
 719                 tty_encode_baud_rate(tty, baud, baud);
 720         } else {
 721                 unsigned int cflag;
 722                 cflag = 0;
 723                 cp210x_get_termios_port(port, &cflag, &baud);
 724         }
 725 }
 726
 727 /*
 728  * cp210x_get_termios_port
 729  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 730  */
 731 static void cp210x_get_termios_port(struct usb_serial_port *port,
 732         unsigned int *cflagp, unsigned int *baudp)
 733 {
 734         struct device *dev = &port->dev;
 735         unsigned int cflag;
 736         struct cp210x_flow_ctl flow_ctl;
 737         u32 baud;
 738         u16 bits;
 739         u32 ctl_hs;
 740
 741         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 742
 743         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 744         *baudp = baud;
 745
 746         cflag = *cflagp;
 747
 748         cp210x_get_line_ctl(port, &bits);
 749         cflag &= ~CSIZE;
 750         switch (bits & BITS_DATA_MASK) {
 751         case BITS_DATA_5:
 752                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 753                 cflag |= CS5;
 754                 break;
 755         case BITS_DATA_6:
 756                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 757                 cflag |= CS6;
 758                 break;
 759         case BITS_DATA_7:
 760                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 761                 cflag |= CS7;
 762                 break;
 763         case BITS_DATA_8:
 764                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 765                 cflag |= CS8;
 766                 break;
 767         case BITS_DATA_9:
 768                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 769                 cflag |= CS8;
 770                 bits &= ~BITS_DATA_MASK;
 771                 bits |= BITS_DATA_8;
 772                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 773                 break;
 774         default:
 775                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 776                 cflag |= CS8;
 777                 bits &= ~BITS_DATA_MASK;
 778                 bits |= BITS_DATA_8;
 779                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 780                 break;
 781         }
 782
 783         switch (bits & BITS_PARITY_MASK) {
 784         case BITS_PARITY_NONE:
 785                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 786                 cflag &= ~PARENB;
 787                 break;
 788         case BITS_PARITY_ODD:
 789                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 790                 cflag |= (PARENB|PARODD);
 791                 break;
 792         case BITS_PARITY_EVEN:
 793                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 794                 cflag &= ~PARODD;
 795                 cflag |= PARENB;
 796                 break;
 797         case BITS_PARITY_MARK:
 798                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 799                 cflag |= (PARENB|PARODD|CMSPAR);
 800                 break;
 801         case BITS_PARITY_SPACE:
 802                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 803                 cflag &= ~PARODD;
 804                 cflag |= (PARENB|CMSPAR);
 805                 break;
 806         default:
 807                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 808                 cflag &= ~PARENB;
 809                 bits &= ~BITS_PARITY_MASK;
 810                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 811                 break;
 812         }
 813
 814         cflag &= ~CSTOPB;
 815         switch (bits & BITS_STOP_MASK) {
 816         case BITS_STOP_1:
 817                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 818                 break;
 819         case BITS_STOP_1_5:
 820                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 821                 bits &= ~BITS_STOP_MASK;
 822                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 823                 break;
 824         case BITS_STOP_2:
 825                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 826                 cflag |= CSTOPB;
 827                 break;
 828         default:
 829                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 830                 bits &= ~BITS_STOP_MASK;
 831                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 832                 break;
 833         }
 834
 835         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 836                         sizeof(flow_ctl));
 837         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 838         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
 839                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 840                 cflag |= CRTSCTS;
 841         } else {
 842                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 843                 cflag &= ~CRTSCTS;
 844         }
 845
 846         *cflagp = cflag;
 847 }
 848
 849 /*
 850  * CP2101 supports the following baud rates:
 851  *
 852  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 853  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 854  *
 855  * CP2102 and CP2103 support the following additional rates:
 856  *
 857  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 858  *      576000
 859  *
 860  * The device will map a requested rate to a supported one, but the result
 861  * of requests for rates greater than 1053257 is undefined (see AN205).
 862  *
 863  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 864  * respectively, with an error less than 1%. The actual rates are determined
 865  * by
 866  *
 867  *      div = round(freq / (2 x prescale x request))
 868  *      actual = freq / (2 x prescale x div)
 869  *
 870  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 871  * or 1 otherwise.
 872  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 873  * otherwise.
 874  */
 875 static void cp210x_change_speed(struct tty_struct *tty,
 876                 struct usb_serial_port *port, struct ktermios *old_termios)
 877 {
 878         u32 baud;
 879
 880         baud = tty->termios.c_ospeed;
 881
 882         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 883          * or to an arbitrary rate in [1M,2M].
 884          *
 885          * NOTE: B0 is not implemented.
 886          */
 887         baud = cp210x_quantise_baudrate(baud);
 888
 889         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
 890         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
 891                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 892                 if (old_termios)
 893                         baud = old_termios->c_ospeed;
 894                 else
 895                         baud = 9600;
 896         }
 897
 898         tty_encode_baud_rate(tty, baud, baud);
 899 }
 900
 901 static void cp210x_set_termios(struct tty_struct *tty,
 902                 struct usb_serial_port *port, struct ktermios *old_termios)
 903 {
 904         struct device *dev = &port->dev;
 905         unsigned int cflag, old_cflag;
 906         u16 bits;
 907
 908         cflag = tty->termios.c_cflag;
 909         old_cflag = old_termios->c_cflag;
 910
 911         if (tty->termios.c_ospeed != old_termios->c_ospeed)
 912                 cp210x_change_speed(tty, port, old_termios);
 913
 914         /* If the number of data bits is to be updated */
 915         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 916                 cp210x_get_line_ctl(port, &bits);
 917                 bits &= ~BITS_DATA_MASK;
 918                 switch (cflag & CSIZE) {
 919                 case CS5:
 920                         bits |= BITS_DATA_5;
 921                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
 922                         break;
 923                 case CS6:
 924                         bits |= BITS_DATA_6;
 925                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
 926                         break;
 927                 case CS7:
 928                         bits |= BITS_DATA_7;
 929                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
 930                         break;
 931                 case CS8:
 932                         bits |= BITS_DATA_8;
 933                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
 934                         break;
 935                 /*case CS9:
 936                         bits |= BITS_DATA_9;
 937                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
 938                         break;*/
 939                 default:
 940                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
 941                         bits |= BITS_DATA_8;
 942                         break;
 943                 }
 944                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 945                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
 946         }
 947
 948         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 949             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 950                 cp210x_get_line_ctl(port, &bits);
 951                 bits &= ~BITS_PARITY_MASK;
 952                 if (cflag & PARENB) {
 953                         if (cflag & CMSPAR) {
 954                                 if (cflag & PARODD) {
 955                                         bits |= BITS_PARITY_MARK;
 956                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
 957                                 } else {
 958                                         bits |= BITS_PARITY_SPACE;
 959                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 960                                 }
 961                         } else {
 962                                 if (cflag & PARODD) {
 963                                         bits |= BITS_PARITY_ODD;
 964                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
 965                                 } else {
 966                                         bits |= BITS_PARITY_EVEN;
 967                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 968                                 }
 969                         }
 970                 }
 971                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 972                         dev_dbg(dev, "Parity mode not supported by device\n");
 973         }
 974
 975         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 976                 cp210x_get_line_ctl(port, &bits);
 977                 bits &= ~BITS_STOP_MASK;
 978                 if (cflag & CSTOPB) {
 979                         bits |= BITS_STOP_2;
 980                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 981                 } else {
 982                         bits |= BITS_STOP_1;
 983                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 984                 }
 985                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 986                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
 987         }
 988
 989         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 990                 struct cp210x_flow_ctl flow_ctl;
 991                 u32 ctl_hs;
 992                 u32 flow_repl;
 993
 994                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
 995                                 sizeof(flow_ctl));
 996                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
 997                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
 998                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
 999                                 __func__, ctl_hs, flow_repl);
1000
1001                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1002                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1003                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1004                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1005                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1006                 if (cflag & CRTSCTS) {
1007                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1008
1009                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1010                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1011                                         CP210X_SERIAL_RTS_FLOW_CTL);
1012                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1013                 } else {
1014                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1015
1016                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1017                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1018                                         CP210X_SERIAL_RTS_ACTIVE);
1019                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1020                 }
1021
1022                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1023                                 __func__, ctl_hs, flow_repl);
1024                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1025                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1026                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1027                                 sizeof(flow_ctl));
1028         }
1029
1030 }
1031
1032 static int cp210x_tiocmset(struct tty_struct *tty,
1033                 unsigned int set, unsigned int clear)
1034 {
1035         struct usb_serial_port *port = tty->driver_data;
1036         return cp210x_tiocmset_port(port, set, clear);
1037 }
1038
1039 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1040                 unsigned int set, unsigned int clear)
1041 {
1042         u16 control = 0;
1043
1044         if (set & TIOCM_RTS) {
1045                 control |= CONTROL_RTS;
1046                 control |= CONTROL_WRITE_RTS;
1047         }
1048         if (set & TIOCM_DTR) {
1049                 control |= CONTROL_DTR;
1050                 control |= CONTROL_WRITE_DTR;
1051         }
1052         if (clear & TIOCM_RTS) {
1053                 control &= ~CONTROL_RTS;
1054                 control |= CONTROL_WRITE_RTS;
1055         }
1056         if (clear & TIOCM_DTR) {
1057                 control &= ~CONTROL_DTR;
1058                 control |= CONTROL_WRITE_DTR;
1059         }
1060
1061         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1062
1063         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1064 }
1065
1066 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1067 {
1068         if (on)
1069                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1070         else
1071                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1072 }
1073
1074 static int cp210x_tiocmget(struct tty_struct *tty)
1075 {
1076         struct usb_serial_port *port = tty->driver_data;
1077         u8 control;
1078         int result;
1079
1080         cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1081
1082         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1083                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1084                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1085                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1086                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1087                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1088
1089         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1090
1091         return result;
1092 }
1093
1094 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1095 {
1096         struct usb_serial_port *port = tty->driver_data;
1097         u16 state;
1098
1099         if (break_state == 0)
1100                 state = BREAK_OFF;
1101         else
1102                 state = BREAK_ON;
1103         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1104                 state == BREAK_OFF ? "off" : "on");
1105         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1106 }
1107
1108 static int cp210x_port_probe(struct usb_serial_port *port)
1109 {
1110         struct usb_serial *serial = port->serial;
1111         struct usb_host_interface *cur_altsetting;
1112         struct cp210x_port_private *port_priv;
1113         int ret;
1114
1115         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1116         if (!port_priv)
1117                 return -ENOMEM;
1118
1119         cur_altsetting = serial->interface->cur_altsetting;
1120         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1121
1122         usb_set_serial_port_data(port, port_priv);
1123
1124         ret = cp210x_detect_swapped_line_ctl(port);
1125         if (ret) {
1126                 kfree(port_priv);
1127                 return ret;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static int cp210x_port_remove(struct usb_serial_port *port)
1134 {
1135         struct cp210x_port_private *port_priv;
1136
1137         port_priv = usb_get_serial_port_data(port);
1138         kfree(port_priv);
1139
1140         return 0;
1141 }
1142
1143 module_usb_serial_driver(serial_drivers, id_table);
1144
1145 MODULE_DESCRIPTION(DRIVER_DESC);
1146 MODULE_LICENSE("GPL");