LXR linux/drivers/media/usb/gspca/stk1135.c

   1/*
   2 * Syntek STK1135 subdriver
   3 *
   4 * Copyright (c) 2013 Ondrej Zary
   5 *
   6 * Based on Syntekdriver (stk11xx) by Nicolas VIVIEN:
   7 *   http://syntekdriver.sourceforge.net
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17 * GNU General Public License for more details.
  18 */
  19
  20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22#define MODULE_NAME "stk1135"
  23
  24#include "gspca.h"
  25#include "stk1135.h"
  26
  27MODULE_AUTHOR("Ondrej Zary");
  28MODULE_DESCRIPTION("Syntek STK1135 USB Camera Driver");
  29MODULE_LICENSE("GPL");
  30
  31
  32/* specific webcam descriptor */
  33struct sd {
  34        struct gspca_dev gspca_dev;     /* !! must be the first item */
  35
  36        u8 pkt_seq;
  37        u8 sensor_page;
  38
  39        bool flip_status;
  40        u8 flip_debounce;
  41
  42        struct v4l2_ctrl *hflip;
  43        struct v4l2_ctrl *vflip;
  44};
  45
  46static const struct v4l2_pix_format stk1135_modes[] = {
  47        /* default mode (this driver supports variable resolution) */
  48        {640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
  49                .bytesperline = 640,
  50                .sizeimage = 640 * 480,
  51                .colorspace = V4L2_COLORSPACE_SRGB},
  52};
  53
  54/* -- read a register -- */
  55static u8 reg_r(struct gspca_dev *gspca_dev, u16 index)
  56{
  57        struct usb_device *dev = gspca_dev->dev;
  58        int ret;
  59
  60        if (gspca_dev->usb_err < 0)
  61                return 0;
  62        ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  63                        0x00,
  64                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  65                        0x00,
  66                        index,
  67                        gspca_dev->usb_buf, 1,
  68                        500);
  69
  70        gspca_dbg(gspca_dev, D_USBI, "reg_r 0x%x=0x%02x\n",
  71                  index, gspca_dev->usb_buf[0]);
  72        if (ret < 0) {
  73                pr_err("reg_r 0x%x err %d\n", index, ret);
  74                gspca_dev->usb_err = ret;
  75                return 0;
  76        }
  77
  78        return gspca_dev->usb_buf[0];
  79}
  80
  81/* -- write a register -- */
  82static void reg_w(struct gspca_dev *gspca_dev, u16 index, u8 val)
  83{
  84        int ret;
  85        struct usb_device *dev = gspca_dev->dev;
  86
  87        if (gspca_dev->usb_err < 0)
  88                return;
  89        ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  90                        0x01,
  91                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  92                        val,
  93                        index,
  94                        NULL,
  95                        0,
  96                        500);
  97        gspca_dbg(gspca_dev, D_USBO, "reg_w 0x%x:=0x%02x\n", index, val);
  98        if (ret < 0) {
  99                pr_err("reg_w 0x%x err %d\n", index, ret);
 100                gspca_dev->usb_err = ret;
 101        }
 102}
 103
 104static void reg_w_mask(struct gspca_dev *gspca_dev, u16 index, u8 val, u8 mask)
 105{
 106        val = (reg_r(gspca_dev, index) & ~mask) | (val & mask);
 107        reg_w(gspca_dev, index, val);
 108}
 109
 110/* this function is called at probe time */
 111static int sd_config(struct gspca_dev *gspca_dev,
 112                        const struct usb_device_id *id)
 113{
 114        gspca_dev->cam.cam_mode = stk1135_modes;
 115        gspca_dev->cam.nmodes = ARRAY_SIZE(stk1135_modes);
 116        return 0;
 117}
 118
 119static int stk1135_serial_wait_ready(struct gspca_dev *gspca_dev)
 120{
 121        int i = 0;
 122        u8 val;
 123
 124        do {
 125                val = reg_r(gspca_dev, STK1135_REG_SICTL + 1);
 126                if (i++ > 500) { /* maximum retry count */
 127                        pr_err("serial bus timeout: status=0x%02x\n", val);
 128                        return -1;
 129                }
 130        /* repeat if BUSY or WRITE/READ not finished */
 131        } while ((val & 0x10) || !(val & 0x05));
 132
 133        return 0;
 134}
 135
 136static u8 sensor_read_8(struct gspca_dev *gspca_dev, u8 addr)
 137{
 138        reg_w(gspca_dev, STK1135_REG_SBUSR, addr);
 139        /* begin read */
 140        reg_w(gspca_dev, STK1135_REG_SICTL, 0x20);
 141        /* wait until finished */
 142        if (stk1135_serial_wait_ready(gspca_dev)) {
 143                pr_err("Sensor read failed\n");
 144                return 0;
 145        }
 146
 147        return reg_r(gspca_dev, STK1135_REG_SBUSR + 1);
 148}
 149
 150static u16 sensor_read_16(struct gspca_dev *gspca_dev, u8 addr)
 151{
 152        return (sensor_read_8(gspca_dev, addr) << 8) |
 153                sensor_read_8(gspca_dev, 0xf1);
 154}
 155
 156static void sensor_write_8(struct gspca_dev *gspca_dev, u8 addr, u8 data)
 157{
 158        /* load address and data registers */
 159        reg_w(gspca_dev, STK1135_REG_SBUSW, addr);
 160        reg_w(gspca_dev, STK1135_REG_SBUSW + 1, data);
 161        /* begin write */
 162        reg_w(gspca_dev, STK1135_REG_SICTL, 0x01);
 163        /* wait until finished */
 164        if (stk1135_serial_wait_ready(gspca_dev)) {
 165                pr_err("Sensor write failed\n");
 166                return;
 167        }
 168}
 169
 170static void sensor_write_16(struct gspca_dev *gspca_dev, u8 addr, u16 data)
 171{
 172        sensor_write_8(gspca_dev, addr, data >> 8);
 173        sensor_write_8(gspca_dev, 0xf1, data & 0xff);
 174}
 175
 176static void sensor_set_page(struct gspca_dev *gspca_dev, u8 page)
 177{
 178        struct sd *sd = (struct sd *) gspca_dev;
 179
 180        if (page != sd->sensor_page) {
 181                sensor_write_16(gspca_dev, 0xf0, page);
 182                sd->sensor_page = page;
 183        }
 184}
 185
 186static u16 sensor_read(struct gspca_dev *gspca_dev, u16 reg)
 187{
 188        sensor_set_page(gspca_dev, reg >> 8);
 189        return sensor_read_16(gspca_dev, reg & 0xff);
 190}
 191
 192static void sensor_write(struct gspca_dev *gspca_dev, u16 reg, u16 val)
 193{
 194        sensor_set_page(gspca_dev, reg >> 8);
 195        sensor_write_16(gspca_dev, reg & 0xff, val);
 196}
 197
 198static void sensor_write_mask(struct gspca_dev *gspca_dev,
 199                        u16 reg, u16 val, u16 mask)
 200{
 201        val = (sensor_read(gspca_dev, reg) & ~mask) | (val & mask);
 202        sensor_write(gspca_dev, reg, val);
 203}
 204
 205struct sensor_val {
 206        u16 reg;
 207        u16 val;
 208};
 209
 210/* configure MT9M112 sensor */
 211static void stk1135_configure_mt9m112(struct gspca_dev *gspca_dev)
 212{
 213        static const struct sensor_val cfg[] = {
 214                /* restart&reset, chip enable, reserved */
 215                { 0x00d, 0x000b }, { 0x00d, 0x0008 }, { 0x035, 0x0022 },
 216                /* mode ctl: AWB on, AE both, clip aper corr, defect corr, AE */
 217                { 0x106, 0x700e },
 218
 219                { 0x2dd, 0x18e0 }, /* B-R thresholds, */
 220
 221                /* AWB */
 222                { 0x21f, 0x0180 }, /* Cb and Cr limits */
 223                { 0x220, 0xc814 }, { 0x221, 0x8080 }, /* lum limits, RGB gain */
 224                { 0x222, 0xa078 }, { 0x223, 0xa078 }, /* R, B limit */
 225                { 0x224, 0x5f20 }, { 0x228, 0xea02 }, /* mtx adj lim, adv ctl */
 226                { 0x229, 0x867a }, /* wide gates */
 227
 228                /* Color correction */
 229                /* imager gains base, delta, delta signs */
 230                { 0x25e, 0x594c }, { 0x25f, 0x4d51 }, { 0x260, 0x0002 },
 231                /* AWB adv ctl 2, gain offs */
 232                { 0x2ef, 0x0008 }, { 0x2f2, 0x0000 },
 233                /* base matrix signs, scale K1-5, K6-9 */
 234                { 0x202, 0x00ee }, { 0x203, 0x3923 }, { 0x204, 0x0724 },
 235                /* base matrix coef */
 236                { 0x209, 0x00cd }, { 0x20a, 0x0093 }, { 0x20b, 0x0004 },/*K1-3*/
 237                { 0x20c, 0x005c }, { 0x20d, 0x00d9 }, { 0x20e, 0x0053 },/*K4-6*/
 238                { 0x20f, 0x0008 }, { 0x210, 0x0091 }, { 0x211, 0x00cf },/*K7-9*/
 239                { 0x215, 0x0000 }, /* delta mtx signs */
 240                /* delta matrix coef */
 241                { 0x216, 0x0000 }, { 0x217, 0x0000 }, { 0x218, 0x0000 },/*D1-3*/
 242                { 0x219, 0x0000 }, { 0x21a, 0x0000 }, { 0x21b, 0x0000 },/*D4-6*/
 243                { 0x21c, 0x0000 }, { 0x21d, 0x0000 }, { 0x21e, 0x0000 },/*D7-9*/
 244                /* enable & disable manual WB to apply color corr. settings */
 245                { 0x106, 0xf00e }, { 0x106, 0x700e },
 246
 247                /* Lens shading correction */
 248                { 0x180, 0x0007 }, /* control */
 249                /* vertical knee 0, 2+1, 4+3 */
 250                { 0x181, 0xde13 }, { 0x182, 0xebe2 }, { 0x183, 0x00f6 }, /* R */
 251                { 0x184, 0xe114 }, { 0x185, 0xeadd }, { 0x186, 0xfdf6 }, /* G */
 252                { 0x187, 0xe511 }, { 0x188, 0xede6 }, { 0x189, 0xfbf7 }, /* B */
 253                /* horizontal knee 0, 2+1, 4+3, 5 */
 254                { 0x18a, 0xd613 }, { 0x18b, 0xedec }, /* R .. */
 255                { 0x18c, 0xf9f2 }, { 0x18d, 0x0000 }, /* .. R */
 256                { 0x18e, 0xd815 }, { 0x18f, 0xe9ea }, /* G .. */
 257                { 0x190, 0xf9f1 }, { 0x191, 0x0002 }, /* .. G */
 258                { 0x192, 0xde10 }, { 0x193, 0xefef }, /* B .. */
 259                { 0x194, 0xfbf4 }, { 0x195, 0x0002 }, /* .. B */
 260                /* vertical knee 6+5, 8+7 */
 261                { 0x1b6, 0x0e06 }, { 0x1b7, 0x2713 }, /* R */
 262                { 0x1b8, 0x1106 }, { 0x1b9, 0x2713 }, /* G */
 263                { 0x1ba, 0x0c03 }, { 0x1bb, 0x2a0f }, /* B */
 264                /* horizontal knee 7+6, 9+8, 10 */
 265                { 0x1bc, 0x1208 }, { 0x1bd, 0x1a16 }, { 0x1be, 0x0022 }, /* R */
 266                { 0x1bf, 0x150a }, { 0x1c0, 0x1c1a }, { 0x1c1, 0x002d }, /* G */
 267                { 0x1c2, 0x1109 }, { 0x1c3, 0x1414 }, { 0x1c4, 0x002a }, /* B */
 268                { 0x106, 0x740e }, /* enable lens shading correction */
 269
 270                /* Gamma correction - context A */
 271                { 0x153, 0x0b03 }, { 0x154, 0x4722 }, { 0x155, 0xac82 },
 272                { 0x156, 0xdac7 }, { 0x157, 0xf5e9 }, { 0x158, 0xff00 },
 273                /* Gamma correction - context B */
 274                { 0x1dc, 0x0b03 }, { 0x1dd, 0x4722 }, { 0x1de, 0xac82 },
 275                { 0x1df, 0xdac7 }, { 0x1e0, 0xf5e9 }, { 0x1e1, 0xff00 },
 276
 277                /* output format: RGB, invert output pixclock, output bayer */
 278                { 0x13a, 0x4300 }, { 0x19b, 0x4300 }, /* for context A, B */
 279                { 0x108, 0x0180 }, /* format control - enable bayer row flip */
 280
 281                { 0x22f, 0xd100 }, { 0x29c, 0xd100 }, /* AE A, B */
 282
 283                /* default prg conf, prg ctl - by 0x2d2, prg advance - PA1 */
 284                { 0x2d2, 0x0000 }, { 0x2cc, 0x0004 }, { 0x2cb, 0x0001 },
 285
 286                { 0x22e, 0x0c3c }, { 0x267, 0x1010 }, /* AE tgt ctl, gain lim */
 287
 288                /* PLL */
 289                { 0x065, 0xa000 }, /* clk ctl - enable PLL (clear bit 14) */
 290                { 0x066, 0x2003 }, { 0x067, 0x0501 }, /* PLL M=128, N=3, P=1 */
 291                { 0x065, 0x2000 }, /* disable PLL bypass (clear bit 15) */
 292
 293                { 0x005, 0x01b8 }, { 0x007, 0x00d8 }, /* horiz blanking B, A */
 294
 295                /* AE line size, shutter delay limit */
 296                { 0x239, 0x06c0 }, { 0x23b, 0x040e }, /* for context A */
 297                { 0x23a, 0x06c0 }, { 0x23c, 0x0564 }, /* for context B */
 298                /* shutter width basis 60Hz, 50Hz */
 299                { 0x257, 0x0208 }, { 0x258, 0x0271 }, /* for context A */
 300                { 0x259, 0x0209 }, { 0x25a, 0x0271 }, /* for context B */
 301
 302                { 0x25c, 0x120d }, { 0x25d, 0x1712 }, /* flicker 60Hz, 50Hz */
 303                { 0x264, 0x5e1c }, /* reserved */
 304                /* flicker, AE gain limits, gain zone limits */
 305                { 0x25b, 0x0003 }, { 0x236, 0x7810 }, { 0x237, 0x8304 },
 306
 307                { 0x008, 0x0021 }, /* vert blanking A */
 308        };
 309        int i;
 310        u16 width, height;
 311
 312        for (i = 0; i < ARRAY_SIZE(cfg); i++)
 313                sensor_write(gspca_dev, cfg[i].reg, cfg[i].val);
 314
 315        /* set output size */
 316        width = gspca_dev->pixfmt.width;
 317        height = gspca_dev->pixfmt.height;
 318        if (width <= 640 && height <= 512) { /* context A (half readout speed)*/
 319                sensor_write(gspca_dev, 0x1a7, width);
 320                sensor_write(gspca_dev, 0x1aa, height);
 321                /* set read mode context A */
 322                sensor_write(gspca_dev, 0x0c8, 0x0000);
 323                /* set resize, read mode, vblank, hblank context A */
 324                sensor_write(gspca_dev, 0x2c8, 0x0000);
 325        } else { /* context B (full readout speed) */
 326                sensor_write(gspca_dev, 0x1a1, width);
 327                sensor_write(gspca_dev, 0x1a4, height);
 328                /* set read mode context B */
 329                sensor_write(gspca_dev, 0x0c8, 0x0008);
 330                /* set resize, read mode, vblank, hblank context B */
 331                sensor_write(gspca_dev, 0x2c8, 0x040b);
 332        }
 333}
 334
 335static void stk1135_configure_clock(struct gspca_dev *gspca_dev)
 336{
 337        /* configure SCLKOUT */
 338        reg_w(gspca_dev, STK1135_REG_TMGEN, 0x12);
 339        /* set 1 clock per pixel */
 340        /* and positive edge clocked pulse high when pixel counter = 0 */
 341        reg_w(gspca_dev, STK1135_REG_TCP1 + 0, 0x41);
 342        reg_w(gspca_dev, STK1135_REG_TCP1 + 1, 0x00);
 343        reg_w(gspca_dev, STK1135_REG_TCP1 + 2, 0x00);
 344        reg_w(gspca_dev, STK1135_REG_TCP1 + 3, 0x00);
 345
 346        /* enable CLKOUT for sensor */
 347        reg_w(gspca_dev, STK1135_REG_SENSO + 0, 0x10);
 348        /* disable STOP clock */
 349        reg_w(gspca_dev, STK1135_REG_SENSO + 1, 0x00);
 350        /* set lower 8 bits of PLL feedback divider */
 351        reg_w(gspca_dev, STK1135_REG_SENSO + 3, 0x07);
 352        /* set other PLL parameters */
 353        reg_w(gspca_dev, STK1135_REG_PLLFD, 0x06);
 354        /* enable timing generator */
 355        reg_w(gspca_dev, STK1135_REG_TMGEN, 0x80);
 356        /* enable PLL */
 357        reg_w(gspca_dev, STK1135_REG_SENSO + 2, 0x04);
 358
 359        /* set serial interface clock divider (30MHz/0x1f*16+2) = 60240 kHz) */
 360        reg_w(gspca_dev, STK1135_REG_SICTL + 2, 0x1f);
 361
 362        /* wait a while for sensor to catch up */
 363        udelay(1000);
 364}
 365
 366static void stk1135_camera_disable(struct gspca_dev *gspca_dev)
 367{
 368        /* set capture end Y position to 0 */
 369        reg_w(gspca_dev, STK1135_REG_CIEPO + 2, 0x00);
 370        reg_w(gspca_dev, STK1135_REG_CIEPO + 3, 0x00);
 371        /* disable capture */
 372        reg_w_mask(gspca_dev, STK1135_REG_SCTRL, 0x00, 0x80);
 373
 374        /* enable sensor standby and diasble chip enable */
 375        sensor_write_mask(gspca_dev, 0x00d, 0x0004, 0x000c);
 376
 377        /* disable PLL */
 378        reg_w_mask(gspca_dev, STK1135_REG_SENSO + 2, 0x00, 0x01);
 379        /* disable timing generator */
 380        reg_w(gspca_dev, STK1135_REG_TMGEN, 0x00);
 381        /* enable STOP clock */
 382        reg_w(gspca_dev, STK1135_REG_SENSO + 1, 0x20);
 383        /* disable CLKOUT for sensor */
 384        reg_w(gspca_dev, STK1135_REG_SENSO, 0x00);
 385
 386        /* disable sensor (GPIO5) and enable GPIO0,3,6 (?) - sensor standby? */
 387        reg_w(gspca_dev, STK1135_REG_GCTRL, 0x49);
 388}
 389
 390/* this function is called at probe and resume time */
 391static int sd_init(struct gspca_dev *gspca_dev)
 392{
 393        u16 sensor_id;
 394        char *sensor_name;
 395        struct sd *sd = (struct sd *) gspca_dev;
 396
 397        /* set GPIO3,4,5,6 direction to output */
 398        reg_w(gspca_dev, STK1135_REG_GCTRL + 2, 0x78);
 399        /* enable sensor (GPIO5) */
 400        reg_w(gspca_dev, STK1135_REG_GCTRL, (1 << 5));
 401        /* disable ROM interface */
 402        reg_w(gspca_dev, STK1135_REG_GCTRL + 3, 0x80);
 403        /* enable interrupts from GPIO8 (flip sensor) and GPIO9 (???) */
 404        reg_w(gspca_dev, STK1135_REG_ICTRL + 1, 0x00);
 405        reg_w(gspca_dev, STK1135_REG_ICTRL + 3, 0x03);
 406        /* enable remote wakeup from GPIO9 (???) */
 407        reg_w(gspca_dev, STK1135_REG_RMCTL + 1, 0x00);
 408        reg_w(gspca_dev, STK1135_REG_RMCTL + 3, 0x02);
 409
 410        /* reset serial interface */
 411        reg_w(gspca_dev, STK1135_REG_SICTL, 0x80);
 412        reg_w(gspca_dev, STK1135_REG_SICTL, 0x00);
 413        /* set sensor address */
 414        reg_w(gspca_dev, STK1135_REG_SICTL + 3, 0xba);
 415        /* disable alt 2-wire serial interface */
 416        reg_w(gspca_dev, STK1135_REG_ASIC + 3, 0x00);
 417
 418        stk1135_configure_clock(gspca_dev);
 419
 420        /* read sensor ID */
 421        sd->sensor_page = 0xff;
 422        sensor_id = sensor_read(gspca_dev, 0x000);
 423
 424        switch (sensor_id) {
 425        case 0x148c:
 426                sensor_name = "MT9M112";
 427                break;
 428        default:
 429                sensor_name = "unknown";
 430        }
 431        pr_info("Detected sensor type %s (0x%x)\n", sensor_name, sensor_id);
 432
 433        stk1135_camera_disable(gspca_dev);
 434
 435        return gspca_dev->usb_err;
 436}
 437
 438/* -- start the camera -- */
 439static int sd_start(struct gspca_dev *gspca_dev)
 440{
 441        struct sd *sd = (struct sd *) gspca_dev;
 442        u16 width, height;
 443
 444        /* enable sensor (GPIO5) */
 445        reg_w(gspca_dev, STK1135_REG_GCTRL, (1 << 5));
 446
 447        stk1135_configure_clock(gspca_dev);
 448
 449        /* set capture start position X = 0, Y = 0 */
 450        reg_w(gspca_dev, STK1135_REG_CISPO + 0, 0x00);
 451        reg_w(gspca_dev, STK1135_REG_CISPO + 1, 0x00);
 452        reg_w(gspca_dev, STK1135_REG_CISPO + 2, 0x00);
 453        reg_w(gspca_dev, STK1135_REG_CISPO + 3, 0x00);
 454
 455        /* set capture end position */
 456        width = gspca_dev->pixfmt.width;
 457        height = gspca_dev->pixfmt.height;
 458        reg_w(gspca_dev, STK1135_REG_CIEPO + 0, width & 0xff);
 459        reg_w(gspca_dev, STK1135_REG_CIEPO + 1, width >> 8);
 460        reg_w(gspca_dev, STK1135_REG_CIEPO + 2, height & 0xff);
 461        reg_w(gspca_dev, STK1135_REG_CIEPO + 3, height >> 8);
 462
 463        /* set 8-bit mode */
 464        reg_w(gspca_dev, STK1135_REG_SCTRL, 0x20);
 465
 466        stk1135_configure_mt9m112(gspca_dev);
 467
 468        /* enable capture */
 469        reg_w_mask(gspca_dev, STK1135_REG_SCTRL, 0x80, 0x80);
 470
 471        if (gspca_dev->usb_err >= 0)
 472                gspca_dbg(gspca_dev, D_STREAM, "camera started alt: 0x%02x\n",
 473                          gspca_dev->alt);
 474
 475        sd->pkt_seq = 0;
 476
 477        return gspca_dev->usb_err;
 478}
 479
 480static void sd_stopN(struct gspca_dev *gspca_dev)
 481{
 482        struct usb_device *dev = gspca_dev->dev;
 483
 484        usb_set_interface(dev, gspca_dev->iface, 0);
 485
 486        stk1135_camera_disable(gspca_dev);
 487
 488        gspca_dbg(gspca_dev, D_STREAM, "camera stopped\n");
 489}
 490
 491static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 492                        u8 *data,                       /* isoc packet */
 493                        int len)                        /* iso packet length */
 494{
 495        struct sd *sd = (struct sd *) gspca_dev;
 496        int skip = sizeof(struct stk1135_pkt_header);
 497        bool flip;
 498        enum gspca_packet_type pkt_type = INTER_PACKET;
 499        struct stk1135_pkt_header *hdr = (void *)data;
 500        u8 seq;
 501
 502        if (len < 4) {
 503                gspca_dbg(gspca_dev, D_PACK, "received short packet (less than 4 bytes)\n");
 504                return;
 505        }
 506
 507        /* GPIO 8 is flip sensor (1 = normal position, 0 = flipped to back) */
 508        flip = !(le16_to_cpu(hdr->gpio) & (1 << 8));
 509        /* it's a switch, needs software debounce */
 510        if (sd->flip_status != flip)
 511                sd->flip_debounce++;
 512        else
 513                sd->flip_debounce = 0;
 514
 515        /* check sequence number (not present in new frame packets) */
 516        if (!(hdr->flags & STK1135_HDR_FRAME_START)) {
 517                seq = hdr->seq & STK1135_HDR_SEQ_MASK;
 518                if (seq != sd->pkt_seq) {
 519                        gspca_dbg(gspca_dev, D_PACK, "received out-of-sequence packet\n");
 520                        /* resync sequence and discard packet */
 521                        sd->pkt_seq = seq;
 522                        gspca_dev->last_packet_type = DISCARD_PACKET;
 523                        return;
 524                }
 525        }
 526        sd->pkt_seq++;
 527        if (sd->pkt_seq > STK1135_HDR_SEQ_MASK)
 528                sd->pkt_seq = 0;
 529
 530        if (len == sizeof(struct stk1135_pkt_header))
 531                return;
 532
 533        if (hdr->flags & STK1135_HDR_FRAME_START) { /* new frame */
 534                skip = 8;       /* the header is longer */
 535                gspca_frame_add(gspca_dev, LAST_PACKET, data, 0);
 536                pkt_type = FIRST_PACKET;
 537        }
 538        gspca_frame_add(gspca_dev, pkt_type, data + skip, len - skip);
 539}
 540
 541static void sethflip(struct gspca_dev *gspca_dev, s32 val)
 542{
 543        struct sd *sd = (struct sd *) gspca_dev;
 544
 545        if (sd->flip_status)
 546                val = !val;
 547        sensor_write_mask(gspca_dev, 0x020, val ? 0x0002 : 0x0000 , 0x0002);
 548}
 549
 550static void setvflip(struct gspca_dev *gspca_dev, s32 val)
 551{
 552        struct sd *sd = (struct sd *) gspca_dev;
 553
 554        if (sd->flip_status)
 555                val = !val;
 556        sensor_write_mask(gspca_dev, 0x020, val ? 0x0001 : 0x0000 , 0x0001);
 557}
 558
 559static void stk1135_dq_callback(struct gspca_dev *gspca_dev)
 560{
 561        struct sd *sd = (struct sd *) gspca_dev;
 562
 563        if (sd->flip_debounce > 100) {
 564                sd->flip_status = !sd->flip_status;
 565                sethflip(gspca_dev, v4l2_ctrl_g_ctrl(sd->hflip));
 566                setvflip(gspca_dev, v4l2_ctrl_g_ctrl(sd->vflip));
 567        }
 568}
 569
 570static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
 571{
 572        struct gspca_dev *gspca_dev =
 573                container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
 574
 575        gspca_dev->usb_err = 0;
 576
 577        if (!gspca_dev->streaming)
 578                return 0;
 579
 580        switch (ctrl->id) {
 581        case V4L2_CID_HFLIP:
 582                sethflip(gspca_dev, ctrl->val);
 583                break;
 584        case V4L2_CID_VFLIP:
 585                setvflip(gspca_dev, ctrl->val);
 586                break;
 587        }
 588
 589        return gspca_dev->usb_err;
 590}
 591
 592static const struct v4l2_ctrl_ops sd_ctrl_ops = {
 593        .s_ctrl = sd_s_ctrl,
 594};
 595
 596static int sd_init_controls(struct gspca_dev *gspca_dev)
 597{
 598        struct sd *sd = (struct sd *) gspca_dev;
 599        struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
 600
 601        gspca_dev->vdev.ctrl_handler = hdl;
 602        v4l2_ctrl_handler_init(hdl, 2);
 603        sd->hflip = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 604                        V4L2_CID_HFLIP, 0, 1, 1, 0);
 605        sd->vflip = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 606                        V4L2_CID_VFLIP, 0, 1, 1, 0);
 607
 608        if (hdl->error) {
 609                pr_err("Could not initialize controls\n");
 610                return hdl->error;
 611        }
 612        return 0;
 613}
 614
 615static void stk1135_try_fmt(struct gspca_dev *gspca_dev, struct v4l2_format *fmt)
 616{
 617        fmt->fmt.pix.width = clamp(fmt->fmt.pix.width, 32U, 1280U);
 618        fmt->fmt.pix.height = clamp(fmt->fmt.pix.height, 32U, 1024U);
 619        /* round up to even numbers */
 620        fmt->fmt.pix.width += (fmt->fmt.pix.width & 1);
 621        fmt->fmt.pix.height += (fmt->fmt.pix.height & 1);
 622
 623        fmt->fmt.pix.bytesperline = fmt->fmt.pix.width;
 624        fmt->fmt.pix.sizeimage = fmt->fmt.pix.width * fmt->fmt.pix.height;
 625}
 626
 627static int stk1135_enum_framesizes(struct gspca_dev *gspca_dev,
 628                        struct v4l2_frmsizeenum *fsize)
 629{
 630        if (fsize->index != 0 || fsize->pixel_format != V4L2_PIX_FMT_SBGGR8)
 631                return -EINVAL;
 632
 633        fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
 634        fsize->stepwise.min_width = 32;
 635        fsize->stepwise.min_height = 32;
 636        fsize->stepwise.max_width = 1280;
 637        fsize->stepwise.max_height = 1024;
 638        fsize->stepwise.step_width = 2;
 639        fsize->stepwise.step_height = 2;
 640
 641        return 0;
 642}
 643
 644/* sub-driver description */
 645static const struct sd_desc sd_desc = {
 646        .name = MODULE_NAME,
 647        .config = sd_config,
 648        .init = sd_init,
 649        .init_controls = sd_init_controls,
 650        .start = sd_start,
 651        .stopN = sd_stopN,
 652        .pkt_scan = sd_pkt_scan,
 653        .dq_callback = stk1135_dq_callback,
 654        .try_fmt = stk1135_try_fmt,
 655        .enum_framesizes = stk1135_enum_framesizes,
 656};
 657
 658/* -- module initialisation -- */
 659static const struct usb_device_id device_table[] = {
 660        {USB_DEVICE(0x174f, 0x6a31)},   /* ASUS laptop, MT9M112 sensor */
 661        {}
 662};
 663MODULE_DEVICE_TABLE(usb, device_table);
 664
 665/* -- device connect -- */
 666static int sd_probe(struct usb_interface *intf,
 667                        const struct usb_device_id *id)
 668{
 669        return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 670                                THIS_MODULE);
 671}
 672
 673static struct usb_driver sd_driver = {
 674        .name = MODULE_NAME,
 675        .id_table = device_table,
 676        .probe = sd_probe,
 677        .disconnect = gspca_disconnect,
 678#ifdef CONFIG_PM
 679        .suspend = gspca_suspend,
 680        .resume = gspca_resume,
 681        .reset_resume = gspca_resume,
 682#endif
 683};
 684
 685module_usb_driver(sd_driver);
 686