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, 0x82F9) }, /* Procyon AVS */
 113         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 114         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 115         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 116         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 117         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 118         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 119         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 120         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 121         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 122         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 123         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 124         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 125         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 126         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 127         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 128         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 129         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 130         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 131         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 132         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 133         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 134         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 135         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 136         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 137         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 138         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 139         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 140         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 141         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 142         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 143         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 144         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 145         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 146         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 147         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 148         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 149         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 150         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 151         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 152         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 153         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 154         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 155         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 156         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 157         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 158         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 159         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 160         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 161         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 162         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 163         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 164         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 165         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 166         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 167         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 168         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 169         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 170         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 171         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 172         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 173         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 174         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 175         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 176         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 177         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 178         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 179         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 180         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 181         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 182         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 183         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 184         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 185         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 186         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 187         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 188         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 189         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 190         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 191         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 192         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 193         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 194         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 195         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 196         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 197         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 198         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 199         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 200         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 201         { } /* Terminating Entry */
 202 };
 203
 204 MODULE_DEVICE_TABLE(usb, id_table);
 205
 206 struct cp210x_port_private {
 207         __u8                    bInterfaceNumber;
 208         bool                    has_swapped_line_ctl;
 209 };
 210
 211 static struct usb_serial_driver cp210x_device = {
 212         .driver = {
 213                 .owner =        THIS_MODULE,
 214                 .name =         "cp210x",
 215         },
 216         .id_table               = id_table,
 217         .num_ports              = 1,
 218         .bulk_in_size           = 256,
 219         .bulk_out_size          = 256,
 220         .open                   = cp210x_open,
 221         .close                  = cp210x_close,
 222         .break_ctl              = cp210x_break_ctl,
 223         .set_termios            = cp210x_set_termios,
 224         .tx_empty               = cp210x_tx_empty,
 225         .tiocmget               = cp210x_tiocmget,
 226         .tiocmset               = cp210x_tiocmset,
 227         .port_probe             = cp210x_port_probe,
 228         .port_remove            = cp210x_port_remove,
 229         .dtr_rts                = cp210x_dtr_rts
 230 };
 231
 232 static struct usb_serial_driver * const serial_drivers[] = {
 233         &cp210x_device, NULL
 234 };
 235
 236 /* Config request types */
 237 #define REQTYPE_HOST_TO_INTERFACE       0x41
 238 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 239 #define REQTYPE_HOST_TO_DEVICE  0x40
 240 #define REQTYPE_DEVICE_TO_HOST  0xc0
 241
 242 /* Config request codes */
 243 #define CP210X_IFC_ENABLE       0x00
 244 #define CP210X_SET_BAUDDIV      0x01
 245 #define CP210X_GET_BAUDDIV      0x02
 246 #define CP210X_SET_LINE_CTL     0x03
 247 #define CP210X_GET_LINE_CTL     0x04
 248 #define CP210X_SET_BREAK        0x05
 249 #define CP210X_IMM_CHAR         0x06
 250 #define CP210X_SET_MHS          0x07
 251 #define CP210X_GET_MDMSTS       0x08
 252 #define CP210X_SET_XON          0x09
 253 #define CP210X_SET_XOFF         0x0A
 254 #define CP210X_SET_EVENTMASK    0x0B
 255 #define CP210X_GET_EVENTMASK    0x0C
 256 #define CP210X_SET_CHAR         0x0D
 257 #define CP210X_GET_CHARS        0x0E
 258 #define CP210X_GET_PROPS        0x0F
 259 #define CP210X_GET_COMM_STATUS  0x10
 260 #define CP210X_RESET            0x11
 261 #define CP210X_PURGE            0x12
 262 #define CP210X_SET_FLOW         0x13
 263 #define CP210X_GET_FLOW         0x14
 264 #define CP210X_EMBED_EVENTS     0x15
 265 #define CP210X_GET_EVENTSTATE   0x16
 266 #define CP210X_SET_CHARS        0x19
 267 #define CP210X_GET_BAUDRATE     0x1D
 268 #define CP210X_SET_BAUDRATE     0x1E
 269
 270 /* CP210X_IFC_ENABLE */
 271 #define UART_ENABLE             0x0001
 272 #define UART_DISABLE            0x0000
 273
 274 /* CP210X_(SET|GET)_BAUDDIV */
 275 #define BAUD_RATE_GEN_FREQ      0x384000
 276
 277 /* CP210X_(SET|GET)_LINE_CTL */
 278 #define BITS_DATA_MASK          0X0f00
 279 #define BITS_DATA_5             0X0500
 280 #define BITS_DATA_6             0X0600
 281 #define BITS_DATA_7             0X0700
 282 #define BITS_DATA_8             0X0800
 283 #define BITS_DATA_9             0X0900
 284
 285 #define BITS_PARITY_MASK        0x00f0
 286 #define BITS_PARITY_NONE        0x0000
 287 #define BITS_PARITY_ODD         0x0010
 288 #define BITS_PARITY_EVEN        0x0020
 289 #define BITS_PARITY_MARK        0x0030
 290 #define BITS_PARITY_SPACE       0x0040
 291
 292 #define BITS_STOP_MASK          0x000f
 293 #define BITS_STOP_1             0x0000
 294 #define BITS_STOP_1_5           0x0001
 295 #define BITS_STOP_2             0x0002
 296
 297 /* CP210X_SET_BREAK */
 298 #define BREAK_ON                0x0001
 299 #define BREAK_OFF               0x0000
 300
 301 /* CP210X_(SET_MHS|GET_MDMSTS) */
 302 #define CONTROL_DTR             0x0001
 303 #define CONTROL_RTS             0x0002
 304 #define CONTROL_CTS             0x0010
 305 #define CONTROL_DSR             0x0020
 306 #define CONTROL_RING            0x0040
 307 #define CONTROL_DCD             0x0080
 308 #define CONTROL_WRITE_DTR       0x0100
 309 #define CONTROL_WRITE_RTS       0x0200
 310
 311 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 312 struct cp210x_comm_status {
 313         __le32   ulErrors;
 314         __le32   ulHoldReasons;
 315         __le32   ulAmountInInQueue;
 316         __le32   ulAmountInOutQueue;
 317         u8       bEofReceived;
 318         u8       bWaitForImmediate;
 319         u8       bReserved;
 320 } __packed;
 321
 322 /*
 323  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 324  * SiLabs app note AN571 gives a strange description of the 4 bits:
 325  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 326  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 327  */
 328 #define PURGE_ALL               0x000f
 329
 330 /*
 331  * Reads a variable-sized block of CP210X_ registers, identified by req.
 332  * Returns data into buf in native USB byte order.
 333  */
 334 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 335                 void *buf, int bufsize)
 336 {
 337         struct usb_serial *serial = port->serial;
 338         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 339         void *dmabuf;
 340         int result;
 341
 342         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 343         if (!dmabuf) {
 344                 /*
 345                  * FIXME Some callers don't bother to check for error,
 346                  * at least give them consistent junk until they are fixed
 347                  */
 348                 memset(buf, 0, bufsize);
 349                 return -ENOMEM;
 350         }
 351
 352         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 353                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 354                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 355                         USB_CTRL_SET_TIMEOUT);
 356         if (result == bufsize) {
 357                 memcpy(buf, dmabuf, bufsize);
 358                 result = 0;
 359         } else {
 360                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 361                                 req, bufsize, result);
 362                 if (result >= 0)
 363                         result = -EPROTO;
 364
 365                 /*
 366                  * FIXME Some callers don't bother to check for error,
 367                  * at least give them consistent junk until they are fixed
 368                  */
 369                 memset(buf, 0, bufsize);
 370         }
 371
 372         kfree(dmabuf);
 373
 374         return result;
 375 }
 376
 377 /*
 378  * Reads any 32-bit CP210X_ register identified by req.
 379  */
 380 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 381 {
 382         __le32 le32_val;
 383         int err;
 384
 385         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 386         if (err) {
 387                 /*
 388                  * FIXME Some callers don't bother to check for error,
 389                  * at least give them consistent junk until they are fixed
 390                  */
 391                 *val = 0;
 392                 return err;
 393         }
 394
 395         *val = le32_to_cpu(le32_val);
 396
 397         return 0;
 398 }
 399
 400 /*
 401  * Reads any 16-bit CP210X_ register identified by req.
 402  */
 403 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 404 {
 405         __le16 le16_val;
 406         int err;
 407
 408         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 409         if (err)
 410                 return err;
 411
 412         *val = le16_to_cpu(le16_val);
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * Reads any 8-bit CP210X_ register identified by req.
 419  */
 420 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 421 {
 422         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 423 }
 424
 425 /*
 426  * Writes any 16-bit CP210X_ register (req) whose value is passed
 427  * entirely in the wValue field of the USB request.
 428  */
 429 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 430 {
 431         struct usb_serial *serial = port->serial;
 432         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 433         int result;
 434
 435         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 436                         req, REQTYPE_HOST_TO_INTERFACE, val,
 437                         port_priv->bInterfaceNumber, NULL, 0,
 438                         USB_CTRL_SET_TIMEOUT);
 439         if (result < 0) {
 440                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 441                                 req, result);
 442         }
 443
 444         return result;
 445 }
 446
 447 /*
 448  * Writes a variable-sized block of CP210X_ registers, identified by req.
 449  * Data in buf must be in native USB byte order.
 450  */
 451 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 452                 void *buf, int bufsize)
 453 {
 454         struct usb_serial *serial = port->serial;
 455         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 456         void *dmabuf;
 457         int result;
 458
 459         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 460         if (!dmabuf)
 461                 return -ENOMEM;
 462
 463         memcpy(dmabuf, buf, bufsize);
 464
 465         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 466                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 467                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 468                         USB_CTRL_SET_TIMEOUT);
 469
 470         kfree(dmabuf);
 471
 472         if (result == bufsize) {
 473                 result = 0;
 474         } else {
 475                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 476                                 req, bufsize, result);
 477                 if (result >= 0)
 478                         result = -EPROTO;
 479         }
 480
 481         return result;
 482 }
 483
 484 /*
 485  * Writes any 32-bit CP210X_ register identified by req.
 486  */
 487 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 488 {
 489         __le32 le32_val;
 490
 491         le32_val = cpu_to_le32(val);
 492
 493         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 494 }
 495
 496 /*
 497  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 498  * Write a known good value 0x800, read it back.
 499  * If it comes back swapped the bug is detected.
 500  * Preserve the original register value.
 501  */
 502 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 503 {
 504         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 505         u16 line_ctl_save;
 506         u16 line_ctl_test;
 507         int err;
 508
 509         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 510         if (err)
 511                 return err;
 512
 513         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 514         if (err)
 515                 return err;
 516
 517         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 518         if (err)
 519                 return err;
 520
 521         if (line_ctl_test == 8) {
 522                 port_priv->has_swapped_line_ctl = true;
 523                 line_ctl_save = swab16(line_ctl_save);
 524         }
 525
 526         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 527 }
 528
 529 /*
 530  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 531  * to workaround cp2108 bug and get correct value.
 532  */
 533 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 534 {
 535         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 536         int err;
 537
 538         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 539         if (err)
 540                 return err;
 541
 542         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 543         if (port_priv->has_swapped_line_ctl)
 544                 *ctl = swab16(*ctl);
 545
 546         return 0;
 547 }
 548
 549 /*
 550  * cp210x_quantise_baudrate
 551  * Quantises the baud rate as per AN205 Table 1
 552  */
 553 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 554 {
 555         if (baud <= 300)
 556                 baud = 300;
 557         else if (baud <= 600)      baud = 600;
 558         else if (baud <= 1200)     baud = 1200;
 559         else if (baud <= 1800)     baud = 1800;
 560         else if (baud <= 2400)     baud = 2400;
 561         else if (baud <= 4000)     baud = 4000;
 562         else if (baud <= 4803)     baud = 4800;
 563         else if (baud <= 7207)     baud = 7200;
 564         else if (baud <= 9612)     baud = 9600;
 565         else if (baud <= 14428)    baud = 14400;
 566         else if (baud <= 16062)    baud = 16000;
 567         else if (baud <= 19250)    baud = 19200;
 568         else if (baud <= 28912)    baud = 28800;
 569         else if (baud <= 38601)    baud = 38400;
 570         else if (baud <= 51558)    baud = 51200;
 571         else if (baud <= 56280)    baud = 56000;
 572         else if (baud <= 58053)    baud = 57600;
 573         else if (baud <= 64111)    baud = 64000;
 574         else if (baud <= 77608)    baud = 76800;
 575         else if (baud <= 117028)   baud = 115200;
 576         else if (baud <= 129347)   baud = 128000;
 577         else if (baud <= 156868)   baud = 153600;
 578         else if (baud <= 237832)   baud = 230400;
 579         else if (baud <= 254234)   baud = 250000;
 580         else if (baud <= 273066)   baud = 256000;
 581         else if (baud <= 491520)   baud = 460800;
 582         else if (baud <= 567138)   baud = 500000;
 583         else if (baud <= 670254)   baud = 576000;
 584         else if (baud < 1000000)
 585                 baud = 921600;
 586         else if (baud > 2000000)
 587                 baud = 2000000;
 588         return baud;
 589 }
 590
 591 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 592 {
 593         int result;
 594
 595         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 596         if (result) {
 597                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 598                 return result;
 599         }
 600
 601         /* Configure the termios structure */
 602         cp210x_get_termios(tty, port);
 603
 604         /* The baud rate must be initialised on cp2104 */
 605         if (tty)
 606                 cp210x_change_speed(tty, port, NULL);
 607
 608         return usb_serial_generic_open(tty, port);
 609 }
 610
 611 static void cp210x_close(struct usb_serial_port *port)
 612 {
 613         usb_serial_generic_close(port);
 614
 615         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 616         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 617
 618         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 619 }
 620
 621 /*
 622  * Read how many bytes are waiting in the TX queue.
 623  */
 624 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 625                 u32 *count)
 626 {
 627         struct usb_serial *serial = port->serial;
 628         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 629         struct cp210x_comm_status *sts;
 630         int result;
 631
 632         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 633         if (!sts)
 634                 return -ENOMEM;
 635
 636         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 637                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 638                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 639                         USB_CTRL_GET_TIMEOUT);
 640         if (result == sizeof(*sts)) {
 641                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 642                 result = 0;
 643         } else {
 644                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 645                 if (result >= 0)
 646                         result = -EPROTO;
 647         }
 648
 649         kfree(sts);
 650
 651         return result;
 652 }
 653
 654 static bool cp210x_tx_empty(struct usb_serial_port *port)
 655 {
 656         int err;
 657         u32 count;
 658
 659         err = cp210x_get_tx_queue_byte_count(port, &count);
 660         if (err)
 661                 return true;
 662
 663         return !count;
 664 }
 665
 666 /*
 667  * cp210x_get_termios
 668  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 669  * from the device, corrects any unsupported values, and configures the
 670  * termios structure to reflect the state of the device
 671  */
 672 static void cp210x_get_termios(struct tty_struct *tty,
 673         struct usb_serial_port *port)
 674 {
 675         unsigned int baud;
 676
 677         if (tty) {
 678                 cp210x_get_termios_port(tty->driver_data,
 679                         &tty->termios.c_cflag, &baud);
 680                 tty_encode_baud_rate(tty, baud, baud);
 681         } else {
 682                 unsigned int cflag;
 683                 cflag = 0;
 684                 cp210x_get_termios_port(port, &cflag, &baud);
 685         }
 686 }
 687
 688 /*
 689  * cp210x_get_termios_port
 690  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 691  */
 692 static void cp210x_get_termios_port(struct usb_serial_port *port,
 693         unsigned int *cflagp, unsigned int *baudp)
 694 {
 695         struct device *dev = &port->dev;
 696         unsigned int cflag;
 697         u8 modem_ctl[16];
 698         u32 baud;
 699         u16 bits;
 700
 701         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 702
 703         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 704         *baudp = baud;
 705
 706         cflag = *cflagp;
 707
 708         cp210x_get_line_ctl(port, &bits);
 709         cflag &= ~CSIZE;
 710         switch (bits & BITS_DATA_MASK) {
 711         case BITS_DATA_5:
 712                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 713                 cflag |= CS5;
 714                 break;
 715         case BITS_DATA_6:
 716                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 717                 cflag |= CS6;
 718                 break;
 719         case BITS_DATA_7:
 720                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 721                 cflag |= CS7;
 722                 break;
 723         case BITS_DATA_8:
 724                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 725                 cflag |= CS8;
 726                 break;
 727         case BITS_DATA_9:
 728                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 729                 cflag |= CS8;
 730                 bits &= ~BITS_DATA_MASK;
 731                 bits |= BITS_DATA_8;
 732                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 733                 break;
 734         default:
 735                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 736                 cflag |= CS8;
 737                 bits &= ~BITS_DATA_MASK;
 738                 bits |= BITS_DATA_8;
 739                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 740                 break;
 741         }
 742
 743         switch (bits & BITS_PARITY_MASK) {
 744         case BITS_PARITY_NONE:
 745                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 746                 cflag &= ~PARENB;
 747                 break;
 748         case BITS_PARITY_ODD:
 749                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 750                 cflag |= (PARENB|PARODD);
 751                 break;
 752         case BITS_PARITY_EVEN:
 753                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 754                 cflag &= ~PARODD;
 755                 cflag |= PARENB;
 756                 break;
 757         case BITS_PARITY_MARK:
 758                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 759                 cflag |= (PARENB|PARODD|CMSPAR);
 760                 break;
 761         case BITS_PARITY_SPACE:
 762                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 763                 cflag &= ~PARODD;
 764                 cflag |= (PARENB|CMSPAR);
 765                 break;
 766         default:
 767                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 768                 cflag &= ~PARENB;
 769                 bits &= ~BITS_PARITY_MASK;
 770                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 771                 break;
 772         }
 773
 774         cflag &= ~CSTOPB;
 775         switch (bits & BITS_STOP_MASK) {
 776         case BITS_STOP_1:
 777                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 778                 break;
 779         case BITS_STOP_1_5:
 780                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 781                 bits &= ~BITS_STOP_MASK;
 782                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 783                 break;
 784         case BITS_STOP_2:
 785                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 786                 cflag |= CSTOPB;
 787                 break;
 788         default:
 789                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 790                 bits &= ~BITS_STOP_MASK;
 791                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 792                 break;
 793         }
 794
 795         cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
 796                         sizeof(modem_ctl));
 797         if (modem_ctl[0] & 0x08) {
 798                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 799                 cflag |= CRTSCTS;
 800         } else {
 801                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 802                 cflag &= ~CRTSCTS;
 803         }
 804
 805         *cflagp = cflag;
 806 }
 807
 808 /*
 809  * CP2101 supports the following baud rates:
 810  *
 811  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
 812  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
 813  *
 814  * CP2102 and CP2103 support the following additional rates:
 815  *
 816  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
 817  *      576000
 818  *
 819  * The device will map a requested rate to a supported one, but the result
 820  * of requests for rates greater than 1053257 is undefined (see AN205).
 821  *
 822  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
 823  * respectively, with an error less than 1%. The actual rates are determined
 824  * by
 825  *
 826  *      div = round(freq / (2 x prescale x request))
 827  *      actual = freq / (2 x prescale x div)
 828  *
 829  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
 830  * or 1 otherwise.
 831  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
 832  * otherwise.
 833  */
 834 static void cp210x_change_speed(struct tty_struct *tty,
 835                 struct usb_serial_port *port, struct ktermios *old_termios)
 836 {
 837         u32 baud;
 838
 839         baud = tty->termios.c_ospeed;
 840
 841         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
 842          * or to an arbitrary rate in [1M,2M].
 843          *
 844          * NOTE: B0 is not implemented.
 845          */
 846         baud = cp210x_quantise_baudrate(baud);
 847
 848         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
 849         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
 850                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
 851                 if (old_termios)
 852                         baud = old_termios->c_ospeed;
 853                 else
 854                         baud = 9600;
 855         }
 856
 857         tty_encode_baud_rate(tty, baud, baud);
 858 }
 859
 860 static void cp210x_set_termios(struct tty_struct *tty,
 861                 struct usb_serial_port *port, struct ktermios *old_termios)
 862 {
 863         struct device *dev = &port->dev;
 864         unsigned int cflag, old_cflag;
 865         u16 bits;
 866         u8 modem_ctl[16];
 867
 868         cflag = tty->termios.c_cflag;
 869         old_cflag = old_termios->c_cflag;
 870
 871         if (tty->termios.c_ospeed != old_termios->c_ospeed)
 872                 cp210x_change_speed(tty, port, old_termios);
 873
 874         /* If the number of data bits is to be updated */
 875         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 876                 cp210x_get_line_ctl(port, &bits);
 877                 bits &= ~BITS_DATA_MASK;
 878                 switch (cflag & CSIZE) {
 879                 case CS5:
 880                         bits |= BITS_DATA_5;
 881                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
 882                         break;
 883                 case CS6:
 884                         bits |= BITS_DATA_6;
 885                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
 886                         break;
 887                 case CS7:
 888                         bits |= BITS_DATA_7;
 889                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
 890                         break;
 891                 case CS8:
 892                         bits |= BITS_DATA_8;
 893                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
 894                         break;
 895                 /*case CS9:
 896                         bits |= BITS_DATA_9;
 897                         dev_dbg(dev, "%s - data bits = 9\n", __func__);
 898                         break;*/
 899                 default:
 900                         dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
 901                         bits |= BITS_DATA_8;
 902                         break;
 903                 }
 904                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 905                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
 906         }
 907
 908         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 909             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 910                 cp210x_get_line_ctl(port, &bits);
 911                 bits &= ~BITS_PARITY_MASK;
 912                 if (cflag & PARENB) {
 913                         if (cflag & CMSPAR) {
 914                                 if (cflag & PARODD) {
 915                                         bits |= BITS_PARITY_MARK;
 916                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
 917                                 } else {
 918                                         bits |= BITS_PARITY_SPACE;
 919                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 920                                 }
 921                         } else {
 922                                 if (cflag & PARODD) {
 923                                         bits |= BITS_PARITY_ODD;
 924                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
 925                                 } else {
 926                                         bits |= BITS_PARITY_EVEN;
 927                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 928                                 }
 929                         }
 930                 }
 931                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 932                         dev_dbg(dev, "Parity mode not supported by device\n");
 933         }
 934
 935         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 936                 cp210x_get_line_ctl(port, &bits);
 937                 bits &= ~BITS_STOP_MASK;
 938                 if (cflag & CSTOPB) {
 939                         bits |= BITS_STOP_2;
 940                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 941                 } else {
 942                         bits |= BITS_STOP_1;
 943                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 944                 }
 945                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 946                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
 947         }
 948
 949         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 950
 951                 /* Only bytes 0, 4 and 7 out of first 8 have functional bits */
 952
 953                 cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
 954                                 sizeof(modem_ctl));
 955                 dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n",
 956                         __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
 957
 958                 if (cflag & CRTSCTS) {
 959                         modem_ctl[0] &= ~0x7B;
 960                         modem_ctl[0] |= 0x09;
 961                         modem_ctl[4] = 0x80;
 962                         /* FIXME - why clear reserved bits just read? */
 963                         modem_ctl[5] = 0;
 964                         modem_ctl[6] = 0;
 965                         modem_ctl[7] = 0;
 966                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
 967                 } else {
 968                         modem_ctl[0] &= ~0x7B;
 969                         modem_ctl[0] |= 0x01;
 970                         /* FIXME - OR here instead of assignment looks wrong */
 971                         modem_ctl[4] |= 0x40;
 972                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
 973                 }
 974
 975                 dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n",
 976                         __func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
 977                 cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl,
 978                                 sizeof(modem_ctl));
 979         }
 980
 981 }
 982
 983 static int cp210x_tiocmset(struct tty_struct *tty,
 984                 unsigned int set, unsigned int clear)
 985 {
 986         struct usb_serial_port *port = tty->driver_data;
 987         return cp210x_tiocmset_port(port, set, clear);
 988 }
 989
 990 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 991                 unsigned int set, unsigned int clear)
 992 {
 993         u16 control = 0;
 994
 995         if (set & TIOCM_RTS) {
 996                 control |= CONTROL_RTS;
 997                 control |= CONTROL_WRITE_RTS;
 998         }
 999         if (set & TIOCM_DTR) {
1000                 control |= CONTROL_DTR;
1001                 control |= CONTROL_WRITE_DTR;
1002         }
1003         if (clear & TIOCM_RTS) {
1004                 control &= ~CONTROL_RTS;
1005                 control |= CONTROL_WRITE_RTS;
1006         }
1007         if (clear & TIOCM_DTR) {
1008                 control &= ~CONTROL_DTR;
1009                 control |= CONTROL_WRITE_DTR;
1010         }
1011
1012         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1013
1014         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1015 }
1016
1017 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1018 {
1019         if (on)
1020                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1021         else
1022                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1023 }
1024
1025 static int cp210x_tiocmget(struct tty_struct *tty)
1026 {
1027         struct usb_serial_port *port = tty->driver_data;
1028         u8 control;
1029         int result;
1030
1031         cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1032
1033         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1034                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1035                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1036                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1037                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1038                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1039
1040         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1041
1042         return result;
1043 }
1044
1045 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1046 {
1047         struct usb_serial_port *port = tty->driver_data;
1048         u16 state;
1049
1050         if (break_state == 0)
1051                 state = BREAK_OFF;
1052         else
1053                 state = BREAK_ON;
1054         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1055                 state == BREAK_OFF ? "off" : "on");
1056         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1057 }
1058
1059 static int cp210x_port_probe(struct usb_serial_port *port)
1060 {
1061         struct usb_serial *serial = port->serial;
1062         struct usb_host_interface *cur_altsetting;
1063         struct cp210x_port_private *port_priv;
1064         int ret;
1065
1066         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1067         if (!port_priv)
1068                 return -ENOMEM;
1069
1070         cur_altsetting = serial->interface->cur_altsetting;
1071         port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber;
1072
1073         usb_set_serial_port_data(port, port_priv);
1074
1075         ret = cp210x_detect_swapped_line_ctl(port);
1076         if (ret) {
1077                 kfree(port_priv);
1078                 return ret;
1079         }
1080
1081         return 0;
1082 }
1083
1084 static int cp210x_port_remove(struct usb_serial_port *port)
1085 {
1086         struct cp210x_port_private *port_priv;
1087
1088         port_priv = usb_get_serial_port_data(port);
1089         kfree(port_priv);
1090
1091         return 0;
1092 }
1093
1094 module_usb_serial_driver(serial_drivers, id_table);
1095
1096 MODULE_DESCRIPTION(DRIVER_DESC);
1097 MODULE_LICENSE("GPL");