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 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22 */
  23
  24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26#define MODULE_NAME "stk1135"
  27
  28#include "gspca.h"
  29#include "stk1135.h"
  30
  31MODULE_AUTHOR("Ondrej Zary");
  32MODULE_DESCRIPTION("Syntek STK1135 USB Camera Driver");
  33MODULE_LICENSE("GPL");
  34
  35
  36/* specific webcam descriptor */
  37struct sd {
  38        struct gspca_dev gspca_dev;     /* !! must be the first item */
  39
  40        u8 pkt_seq;
  41        u8 sensor_page;
  42
  43        bool flip_status;
  44        u8 flip_debounce;
  45
  46        struct v4l2_ctrl *hflip;
  47        struct v4l2_ctrl *vflip;
  48};
  49
  50static const struct v4l2_pix_format stk1135_modes[] = {
  51        /* default mode (this driver supports variable resolution) */
  52        {640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
  53                .bytesperline = 640,
  54                .sizeimage = 640 * 480,
  55                .colorspace = V4L2_COLORSPACE_SRGB},
  56};
  57
  58/* -- read a register -- */
  59static u8 reg_r(struct gspca_dev *gspca_dev, u16 index)
  60{
  61        struct usb_device *dev = gspca_dev->dev;
  62        int ret;
  63
  64        if (gspca_dev->usb_err < 0)
  65                return 0;
  66        ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  67                        0x00,
  68                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  69                        0x00,
  70                        index,
  71                        gspca_dev->usb_buf, 1,
  72                        500);
  73
  74        PDEBUG(D_USBI, "reg_r 0x%x=0x%02x", index, gspca_dev->usb_buf[0]);
  75        if (ret < 0) {
  76                pr_err("reg_r 0x%x err %d\n", index, ret);
  77                gspca_dev->usb_err = ret;
  78                return 0;
  79        }
  80
  81        return gspca_dev->usb_buf[0];
  82}
  83
  84/* -- write a register -- */
  85static void reg_w(struct gspca_dev *gspca_dev, u16 index, u8 val)
  86{
  87        int ret;
  88        struct usb_device *dev = gspca_dev->dev;
  89
  90        if (gspca_dev->usb_err < 0)
  91                return;
  92        ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  93                        0x01,
  94                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  95                        val,
  96                        index,
  97                        NULL,
  98                        0,
  99                        500);
 100        PDEBUG(D_USBO, "reg_w 0x%x:=0x%02x", index, val);
 101        if (ret < 0) {
 102                pr_err("reg_w 0x%x err %d\n", index, ret);
 103                gspca_dev->usb_err = ret;
 104        }
 105}
 106
 107static void reg_w_mask(struct gspca_dev *gspca_dev, u16 index, u8 val, u8 mask)
 108{
 109        val = (reg_r(gspca_dev, index) & ~mask) | (val & mask);
 110        reg_w(gspca_dev, index, val);
 111}
 112
 113/* this function is called at probe time */
 114static int sd_config(struct gspca_dev *gspca_dev,
 115                        const struct usb_device_id *id)
 116{
 117        gspca_dev->cam.cam_mode = stk1135_modes;
 118        gspca_dev->cam.nmodes = ARRAY_SIZE(stk1135_modes);
 119        return 0;
 120}
 121
 122static int stk1135_serial_wait_ready(struct gspca_dev *gspca_dev)
 123{
 124        int i = 0;
 125        u8 val;
 126
 127        do {
 128                val = reg_r(gspca_dev, STK1135_REG_SICTL + 1);
 129                if (i++ > 500) { /* maximum retry count */
 130                        pr_err("serial bus timeout: status=0x%02x\n", val);
 131                        return -1;
 132                }
 133        /* repeat if BUSY or WRITE/READ not finished */
 134        } while ((val & 0x10) || !(val & 0x05));
 135
 136        return 0;
 137}
 138
 139static u8 sensor_read_8(struct gspca_dev *gspca_dev, u8 addr)
 140{
 141        reg_w(gspca_dev, STK1135_REG_SBUSR, addr);
 142        /* begin read */
 143        reg_w(gspca_dev, STK1135_REG_SICTL, 0x20);
 144        /* wait until finished */
 145        if (stk1135_serial_wait_ready(gspca_dev)) {
 146                pr_err("Sensor read failed\n");
 147                return 0;
 148        }
 149
 150        return reg_r(gspca_dev, STK1135_REG_SBUSR + 1);
 151}
 152
 153static u16 sensor_read_16(struct gspca_dev *gspca_dev, u8 addr)
 154{
 155        return (sensor_read_8(gspca_dev, addr) << 8) |
 156                sensor_read_8(gspca_dev, 0xf1);
 157}
 158
 159static void sensor_write_8(struct gspca_dev *gspca_dev, u8 addr, u8 data)
 160{
 161        /* load address and data registers */
 162        reg_w(gspca_dev, STK1135_REG_SBUSW, addr);
 163        reg_w(gspca_dev, STK1135_REG_SBUSW + 1, data);
 164        /* begin write */
 165        reg_w(gspca_dev, STK1135_REG_SICTL, 0x01);
 166        /* wait until finished */
 167        if (stk1135_serial_wait_ready(gspca_dev)) {
 168                pr_err("Sensor write failed\n");
 169                return;
 170        }
 171}
 172
 173static void sensor_write_16(struct gspca_dev *gspca_dev, u8 addr, u16 data)
 174{
 175        sensor_write_8(gspca_dev, addr, data >> 8);
 176        sensor_write_8(gspca_dev, 0xf1, data & 0xff);
 177}
 178
 179static void sensor_set_page(struct gspca_dev *gspca_dev, u8 page)
 180{
 181        struct sd *sd = (struct sd *) gspca_dev;
 182
 183        if (page != sd->sensor_page) {
 184                sensor_write_16(gspca_dev, 0xf0, page);
 185                sd->sensor_page = page;
 186        }
 187}
 188
 189static u16 sensor_read(struct gspca_dev *gspca_dev, u16 reg)
 190{
 191        sensor_set_page(gspca_dev, reg >> 8);
 192        return sensor_read_16(gspca_dev, reg & 0xff);
 193}
 194
 195static void sensor_write(struct gspca_dev *gspca_dev, u16 reg, u16 val)
 196{
 197        sensor_set_page(gspca_dev, reg >> 8);
 198        sensor_write_16(gspca_dev, reg & 0xff, val);
 199}
 200
 201static void sensor_write_mask(struct gspca_dev *gspca_dev,
 202                        u16 reg, u16 val, u16 mask)
 203{
 204        val = (sensor_read(gspca_dev, reg) & ~mask) | (val & mask);
 205        sensor_write(gspca_dev, reg, val);
 206}
 207
 208struct sensor_val {
 209        u16 reg;
 210        u16 val;
 211};
 212
 213/* configure MT9M112 sensor */
 214static void stk1135_configure_mt9m112(struct gspca_dev *gspca_dev)
 215{
 216        static const struct sensor_val cfg[] = {
 217                /* restart&reset, chip enable, reserved */
 218                { 0x00d, 0x000b }, { 0x00d, 0x0008 }, { 0x035, 0x0022 },
 219                /* mode ctl: AWB on, AE both, clip aper corr, defect corr, AE */
 220                { 0x106, 0x700e },
 221
 222                { 0x2dd, 0x18e0 }, /* B-R thresholds, */
 223
 224                /* AWB */
 225                { 0x21f, 0x0180 }, /* Cb and Cr limits */
 226                { 0x220, 0xc814 }, { 0x221, 0x8080 }, /* lum limits, RGB gain */
 227                { 0x222, 0xa078 }, { 0x223, 0xa078 }, /* R, B limit */
 228                { 0x224, 0x5f20 }, { 0x228, 0xea02 }, /* mtx adj lim, adv ctl */
 229                { 0x229, 0x867a }, /* wide gates */
 230
 231                /* Color correction */
 232                /* imager gains base, delta, delta signs */
 233                { 0x25e, 0x594c }, { 0x25f, 0x4d51 }, { 0x260, 0x0002 },
 234                /* AWB adv ctl 2, gain offs */
 235                { 0x2ef, 0x0008 }, { 0x2f2, 0x0000 },
 236                /* base matrix signs, scale K1-5, K6-9 */
 237                { 0x202, 0x00ee }, { 0x203, 0x3923 }, { 0x204, 0x0724 },
 238                /* base matrix coef */
 239                { 0x209, 0x00cd }, { 0x20a, 0x0093 }, { 0x20b, 0x0004 },/*K1-3*/
 240                { 0x20c, 0x005c }, { 0x20d, 0x00d9 }, { 0x20e, 0x0053 },/*K4-6*/
 241                { 0x20f, 0x0008 }, { 0x210, 0x0091 }, { 0x211, 0x00cf },/*K7-9*/
 242                { 0x215, 0x0000 }, /* delta mtx signs */
 243                /* delta matrix coef */
 244                { 0x216, 0x0000 }, { 0x217, 0x0000 }, { 0x218, 0x0000 },/*D1-3*/
 245                { 0x219, 0x0000 }, { 0x21a, 0x0000 }, { 0x21b, 0x0000 },/*D4-6*/
 246                { 0x21c, 0x0000 }, { 0x21d, 0x0000 }, { 0x21e, 0x0000 },/*D7-9*/
 247                /* enable & disable manual WB to apply color corr. settings */
 248                { 0x106, 0xf00e }, { 0x106, 0x700e },
 249
 250                /* Lens shading correction */
 251                { 0x180, 0x0007 }, /* control */
 252                /* vertical knee 0, 2+1, 4+3 */
 253                { 0x181, 0xde13 }, { 0x182, 0xebe2 }, { 0x183, 0x00f6 }, /* R */
 254                { 0x184, 0xe114 }, { 0x185, 0xeadd }, { 0x186, 0xfdf6 }, /* G */
 255                { 0x187, 0xe511 }, { 0x188, 0xede6 }, { 0x189, 0xfbf7 }, /* B */
 256                /* horizontal knee 0, 2+1, 4+3, 5 */
 257                { 0x18a, 0xd613 }, { 0x18b, 0xedec }, /* R .. */
 258                { 0x18c, 0xf9f2 }, { 0x18d, 0x0000 }, /* .. R */
 259                { 0x18e, 0xd815 }, { 0x18f, 0xe9ea }, /* G .. */
 260                { 0x190, 0xf9f1 }, { 0x191, 0x0002 }, /* .. G */
 261                { 0x192, 0xde10 }, { 0x193, 0xefef }, /* B .. */
 262                { 0x194, 0xfbf4 }, { 0x195, 0x0002 }, /* .. B */
 263                /* vertical knee 6+5, 8+7 */
 264                { 0x1b6, 0x0e06 }, { 0x1b7, 0x2713 }, /* R */
 265                { 0x1b8, 0x1106 }, { 0x1b9, 0x2713 }, /* G */
 266                { 0x1ba, 0x0c03 }, { 0x1bb, 0x2a0f }, /* B */
 267                /* horizontal knee 7+6, 9+8, 10 */
 268                { 0x1bc, 0x1208 }, { 0x1bd, 0x1a16 }, { 0x1be, 0x0022 }, /* R */
 269                { 0x1bf, 0x150a }, { 0x1c0, 0x1c1a }, { 0x1c1, 0x002d }, /* G */
 270                { 0x1c2, 0x1109 }, { 0x1c3, 0x1414 }, { 0x1c4, 0x002a }, /* B */
 271                { 0x106, 0x740e }, /* enable lens shading correction */
 272
 273                /* Gamma correction - context A */
 274                { 0x153, 0x0b03 }, { 0x154, 0x4722 }, { 0x155, 0xac82 },
 275                { 0x156, 0xdac7 }, { 0x157, 0xf5e9 }, { 0x158, 0xff00 },
 276                /* Gamma correction - context B */
 277                { 0x1dc, 0x0b03 }, { 0x1dd, 0x4722 }, { 0x1de, 0xac82 },
 278                { 0x1df, 0xdac7 }, { 0x1e0, 0xf5e9 }, { 0x1e1, 0xff00 },
 279
 280                /* output format: RGB, invert output pixclock, output bayer */
 281                { 0x13a, 0x4300 }, { 0x19b, 0x4300 }, /* for context A, B */
 282                { 0x108, 0x0180 }, /* format control - enable bayer row flip */
 283
 284                { 0x22f, 0xd100 }, { 0x29c, 0xd100 }, /* AE A, B */
 285
 286                /* default prg conf, prg ctl - by 0x2d2, prg advance - PA1 */
 287                { 0x2d2, 0x0000 }, { 0x2cc, 0x0004 }, { 0x2cb, 0x0001 },
 288
 289                { 0x22e, 0x0c3c }, { 0x267, 0x1010 }, /* AE tgt ctl, gain lim */
 290
 291                /* PLL */
 292                { 0x065, 0xa000 }, /* clk ctl - enable PLL (clear bit 14) */
 293                { 0x066, 0x2003 }, { 0x067, 0x0501 }, /* PLL M=128, N=3, P=1 */
 294                { 0x065, 0x2000 }, /* disable PLL bypass (clear bit 15) */
 295
 296                { 0x005, 0x01b8 }, { 0x007, 0x00d8 }, /* horiz blanking B, A */
 297
 298                /* AE line size, shutter delay limit */
 299                { 0x239, 0x06c0 }, { 0x23b, 0x040e }, /* for context A */
 300                { 0x23a, 0x06c0 }, { 0x23c, 0x0564 }, /* for context B */
 301                /* shutter width basis 60Hz, 50Hz */
 302                { 0x257, 0x0208 }, { 0x258, 0x0271 }, /* for context A */
 303                { 0x259, 0x0209 }, { 0x25a, 0x0271 }, /* for context B */
 304
 305                { 0x25c, 0x120d }, { 0x25d, 0x1712 }, /* flicker 60Hz, 50Hz */
 306                { 0x264, 0x5e1c }, /* reserved */
 307                /* flicker, AE gain limits, gain zone limits */
 308                { 0x25b, 0x0003 }, { 0x236, 0x7810 }, { 0x237, 0x8304 },
 309
 310                { 0x008, 0x0021 }, /* vert blanking A */
 311        };
 312        int i;
 313        u16 width, height;
 314
 315        for (i = 0; i < ARRAY_SIZE(cfg); i++)
 316                sensor_write(gspca_dev, cfg[i].reg, cfg[i].val);
 317
 318        /* set output size */
 319        width = gspca_dev->pixfmt.width;
 320        height = gspca_dev->pixfmt.height;
 321        if (width <= 640 && height <= 512) { /* context A (half readout speed)*/
 322                sensor_write(gspca_dev, 0x1a7, width);
 323                sensor_write(gspca_dev, 0x1aa, height);
 324                /* set read mode context A */
 325                sensor_write(gspca_dev, 0x0c8, 0x0000);
 326                /* set resize, read mode, vblank, hblank context A */
 327                sensor_write(gspca_dev, 0x2c8, 0x0000);
 328        } else { /* context B (full readout speed) */
 329                sensor_write(gspca_dev, 0x1a1, width);
 330                sensor_write(gspca_dev, 0x1a4, height);
 331                /* set read mode context B */
 332                sensor_write(gspca_dev, 0x0c8, 0x0008);
 333                /* set resize, read mode, vblank, hblank context B */
 334                sensor_write(gspca_dev, 0x2c8, 0x040b);
 335        }
 336}
 337
 338static void stk1135_configure_clock(struct gspca_dev *gspca_dev)
 339{
 340        /* configure SCLKOUT */
 341        reg_w(gspca_dev, STK1135_REG_TMGEN, 0x12);
 342        /* set 1 clock per pixel */
 343        /* and positive edge clocked pulse high when pixel counter = 0 */
 344        reg_w(gspca_dev, STK1135_REG_TCP1 + 0, 0x41);
 345        reg_w(gspca_dev, STK1135_REG_TCP1 + 1, 0x00);
 346        reg_w(gspca_dev, STK1135_REG_TCP1 + 2, 0x00);
 347        reg_w(gspca_dev, STK1135_REG_TCP1 + 3, 0x00);
 348
 349        /* enable CLKOUT for sensor */
 350        reg_w(gspca_dev, STK1135_REG_SENSO + 0, 0x10);
 351        /* disable STOP clock */
 352        reg_w(gspca_dev, STK1135_REG_SENSO + 1, 0x00);
 353        /* set lower 8 bits of PLL feedback divider */
 354        reg_w(gspca_dev, STK1135_REG_SENSO + 3, 0x07);
 355        /* set other PLL parameters */
 356        reg_w(gspca_dev, STK1135_REG_PLLFD, 0x06);
 357        /* enable timing generator */
 358        reg_w(gspca_dev, STK1135_REG_TMGEN, 0x80);
 359        /* enable PLL */
 360        reg_w(gspca_dev, STK1135_REG_SENSO + 2, 0x04);
 361
 362        /* set serial interface clock divider (30MHz/0x1f*16+2) = 60240 kHz) */
 363        reg_w(gspca_dev, STK1135_REG_SICTL + 2, 0x1f);
 364
 365        /* wait a while for sensor to catch up */
 366        udelay(1000);
 367}
 368
 369static void stk1135_camera_disable(struct gspca_dev *gspca_dev)
 370{
 371        /* set capture end Y position to 0 */
 372        reg_w(gspca_dev, STK1135_REG_CIEPO + 2, 0x00);
 373        reg_w(gspca_dev, STK1135_REG_CIEPO + 3, 0x00);
 374        /* disable capture */
 375        reg_w_mask(gspca_dev, STK1135_REG_SCTRL, 0x00, 0x80);
 376
 377        /* enable sensor standby and diasble chip enable */
 378        sensor_write_mask(gspca_dev, 0x00d, 0x0004, 0x000c);
 379
 380        /* disable PLL */
 381        reg_w_mask(gspca_dev, STK1135_REG_SENSO + 2, 0x00, 0x01);
 382        /* disable timing generator */
 383        reg_w(gspca_dev, STK1135_REG_TMGEN, 0x00);
 384        /* enable STOP clock */
 385        reg_w(gspca_dev, STK1135_REG_SENSO + 1, 0x20);
 386        /* disable CLKOUT for sensor */
 387        reg_w(gspca_dev, STK1135_REG_SENSO, 0x00);
 388
 389        /* disable sensor (GPIO5) and enable GPIO0,3,6 (?) - sensor standby? */
 390        reg_w(gspca_dev, STK1135_REG_GCTRL, 0x49);
 391}
 392
 393/* this function is called at probe and resume time */
 394static int sd_init(struct gspca_dev *gspca_dev)
 395{
 396        u16 sensor_id;
 397        char *sensor_name;
 398        struct sd *sd = (struct sd *) gspca_dev;
 399
 400        /* set GPIO3,4,5,6 direction to output */
 401        reg_w(gspca_dev, STK1135_REG_GCTRL + 2, 0x78);
 402        /* enable sensor (GPIO5) */
 403        reg_w(gspca_dev, STK1135_REG_GCTRL, (1 << 5));
 404        /* disable ROM interface */
 405        reg_w(gspca_dev, STK1135_REG_GCTRL + 3, 0x80);
 406        /* enable interrupts from GPIO8 (flip sensor) and GPIO9 (???) */
 407        reg_w(gspca_dev, STK1135_REG_ICTRL + 1, 0x00);
 408        reg_w(gspca_dev, STK1135_REG_ICTRL + 3, 0x03);
 409        /* enable remote wakeup from GPIO9 (???) */
 410        reg_w(gspca_dev, STK1135_REG_RMCTL + 1, 0x00);
 411        reg_w(gspca_dev, STK1135_REG_RMCTL + 3, 0x02);
 412
 413        /* reset serial interface */
 414        reg_w(gspca_dev, STK1135_REG_SICTL, 0x80);
 415        reg_w(gspca_dev, STK1135_REG_SICTL, 0x00);
 416        /* set sensor address */
 417        reg_w(gspca_dev, STK1135_REG_SICTL + 3, 0xba);
 418        /* disable alt 2-wire serial interface */
 419        reg_w(gspca_dev, STK1135_REG_ASIC + 3, 0x00);
 420
 421        stk1135_configure_clock(gspca_dev);
 422
 423        /* read sensor ID */
 424        sd->sensor_page = 0xff;
 425        sensor_id = sensor_read(gspca_dev, 0x000);
 426
 427        switch (sensor_id) {
 428        case 0x148c:
 429                sensor_name = "MT9M112";
 430                break;
 431        default:
 432                sensor_name = "unknown";
 433        }
 434        pr_info("Detected sensor type %s (0x%x)\n", sensor_name, sensor_id);
 435
 436        stk1135_camera_disable(gspca_dev);
 437
 438        return gspca_dev->usb_err;
 439}
 440
 441/* -- start the camera -- */
 442static int sd_start(struct gspca_dev *gspca_dev)
 443{
 444        struct sd *sd = (struct sd *) gspca_dev;
 445        u16 width, height;
 446
 447        /* enable sensor (GPIO5) */
 448        reg_w(gspca_dev, STK1135_REG_GCTRL, (1 << 5));
 449
 450        stk1135_configure_clock(gspca_dev);
 451
 452        /* set capture start position X = 0, Y = 0 */
 453        reg_w(gspca_dev, STK1135_REG_CISPO + 0, 0x00);
 454        reg_w(gspca_dev, STK1135_REG_CISPO + 1, 0x00);
 455        reg_w(gspca_dev, STK1135_REG_CISPO + 2, 0x00);
 456        reg_w(gspca_dev, STK1135_REG_CISPO + 3, 0x00);
 457
 458        /* set capture end position */
 459        width = gspca_dev->pixfmt.width;
 460        height = gspca_dev->pixfmt.height;
 461        reg_w(gspca_dev, STK1135_REG_CIEPO + 0, width & 0xff);
 462        reg_w(gspca_dev, STK1135_REG_CIEPO + 1, width >> 8);
 463        reg_w(gspca_dev, STK1135_REG_CIEPO + 2, height & 0xff);
 464        reg_w(gspca_dev, STK1135_REG_CIEPO + 3, height >> 8);
 465
 466        /* set 8-bit mode */
 467        reg_w(gspca_dev, STK1135_REG_SCTRL, 0x20);
 468
 469        stk1135_configure_mt9m112(gspca_dev);
 470
 471        /* enable capture */
 472        reg_w_mask(gspca_dev, STK1135_REG_SCTRL, 0x80, 0x80);
 473
 474        if (gspca_dev->usb_err >= 0)
 475                PDEBUG(D_STREAM, "camera started alt: 0x%02x",
 476                                gspca_dev->alt);
 477
 478        sd->pkt_seq = 0;
 479
 480        return gspca_dev->usb_err;
 481}
 482
 483static void sd_stopN(struct gspca_dev *gspca_dev)
 484{
 485        struct usb_device *dev = gspca_dev->dev;
 486
 487        usb_set_interface(dev, gspca_dev->iface, 0);
 488
 489        stk1135_camera_disable(gspca_dev);
 490
 491        PDEBUG(D_STREAM, "camera stopped");
 492}
 493
 494static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 495                        u8 *data,                       /* isoc packet */
 496                        int len)                        /* iso packet length */
 497{
 498        struct sd *sd = (struct sd *) gspca_dev;
 499        int skip = sizeof(struct stk1135_pkt_header);
 500        bool flip;
 501        enum gspca_packet_type pkt_type = INTER_PACKET;
 502        struct stk1135_pkt_header *hdr = (void *)data;
 503        u8 seq;
 504
 505        if (len < 4) {
 506                PDEBUG(D_PACK, "received short packet (less than 4 bytes)");
 507                return;
 508        }
 509
 510        /* GPIO 8 is flip sensor (1 = normal position, 0 = flipped to back) */
 511        flip = !(le16_to_cpu(hdr->gpio) & (1 << 8));
 512        /* it's a switch, needs software debounce */
 513        if (sd->flip_status != flip)
 514                sd->flip_debounce++;
 515        else
 516                sd->flip_debounce = 0;
 517
 518        /* check sequence number (not present in new frame packets) */
 519        if (!(hdr->flags & STK1135_HDR_FRAME_START)) {
 520                seq = hdr->seq & STK1135_HDR_SEQ_MASK;
 521                if (seq != sd->pkt_seq) {
 522                        PDEBUG(D_PACK, "received out-of-sequence packet");
 523                        /* resync sequence and discard packet */
 524                        sd->pkt_seq = seq;
 525                        gspca_dev->last_packet_type = DISCARD_PACKET;
 526                        return;
 527                }
 528        }
 529        sd->pkt_seq++;
 530        if (sd->pkt_seq > STK1135_HDR_SEQ_MASK)
 531                sd->pkt_seq = 0;
 532
 533        if (len == sizeof(struct stk1135_pkt_header))
 534                return;
 535
 536        if (hdr->flags & STK1135_HDR_FRAME_START) { /* new frame */
 537                skip = 8;       /* the header is longer */
 538                gspca_frame_add(gspca_dev, LAST_PACKET, data, 0);
 539                pkt_type = FIRST_PACKET;
 540        }
 541        gspca_frame_add(gspca_dev, pkt_type, data + skip, len - skip);
 542}
 543
 544static void sethflip(struct gspca_dev *gspca_dev, s32 val)
 545{
 546        struct sd *sd = (struct sd *) gspca_dev;
 547
 548        if (sd->flip_status)
 549                val = !val;
 550        sensor_write_mask(gspca_dev, 0x020, val ? 0x0002 : 0x0000 , 0x0002);
 551}
 552
 553static void setvflip(struct gspca_dev *gspca_dev, s32 val)
 554{
 555        struct sd *sd = (struct sd *) gspca_dev;
 556
 557        if (sd->flip_status)
 558                val = !val;
 559        sensor_write_mask(gspca_dev, 0x020, val ? 0x0001 : 0x0000 , 0x0001);
 560}
 561
 562static void stk1135_dq_callback(struct gspca_dev *gspca_dev)
 563{
 564        struct sd *sd = (struct sd *) gspca_dev;
 565
 566        if (sd->flip_debounce > 100) {
 567                sd->flip_status = !sd->flip_status;
 568                sethflip(gspca_dev, v4l2_ctrl_g_ctrl(sd->hflip));
 569                setvflip(gspca_dev, v4l2_ctrl_g_ctrl(sd->vflip));
 570        }
 571}
 572
 573static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
 574{
 575        struct gspca_dev *gspca_dev =
 576                container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
 577
 578        gspca_dev->usb_err = 0;
 579
 580        if (!gspca_dev->streaming)
 581                return 0;
 582
 583        switch (ctrl->id) {
 584        case V4L2_CID_HFLIP:
 585                sethflip(gspca_dev, ctrl->val);
 586                break;
 587        case V4L2_CID_VFLIP:
 588                setvflip(gspca_dev, ctrl->val);
 589                break;
 590        }
 591
 592        return gspca_dev->usb_err;
 593}
 594
 595static const struct v4l2_ctrl_ops sd_ctrl_ops = {
 596        .s_ctrl = sd_s_ctrl,
 597};
 598
 599static int sd_init_controls(struct gspca_dev *gspca_dev)
 600{
 601        struct sd *sd = (struct sd *) gspca_dev;
 602        struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
 603
 604        gspca_dev->vdev.ctrl_handler = hdl;
 605        v4l2_ctrl_handler_init(hdl, 2);
 606        sd->hflip = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 607                        V4L2_CID_HFLIP, 0, 1, 1, 0);
 608        sd->vflip = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
 609                        V4L2_CID_VFLIP, 0, 1, 1, 0);
 610
 611        if (hdl->error) {
 612                pr_err("Could not initialize controls\n");
 613                return hdl->error;
 614        }
 615        return 0;
 616}
 617
 618static void stk1135_try_fmt(struct gspca_dev *gspca_dev, struct v4l2_format *fmt)
 619{
 620        fmt->fmt.pix.width = clamp(fmt->fmt.pix.width, 32U, 1280U);
 621        fmt->fmt.pix.height = clamp(fmt->fmt.pix.height, 32U, 1024U);
 622        /* round up to even numbers */
 623        fmt->fmt.pix.width += (fmt->fmt.pix.width & 1);
 624        fmt->fmt.pix.height += (fmt->fmt.pix.height & 1);
 625
 626        fmt->fmt.pix.bytesperline = fmt->fmt.pix.width;
 627        fmt->fmt.pix.sizeimage = fmt->fmt.pix.width * fmt->fmt.pix.height;
 628}
 629
 630static int stk1135_enum_framesizes(struct gspca_dev *gspca_dev,
 631                        struct v4l2_frmsizeenum *fsize)
 632{
 633        if (fsize->index != 0 || fsize->pixel_format != V4L2_PIX_FMT_SBGGR8)
 634                return -EINVAL;
 635
 636        fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
 637        fsize->stepwise.min_width = 32;
 638        fsize->stepwise.min_height = 32;
 639        fsize->stepwise.max_width = 1280;
 640        fsize->stepwise.max_height = 1024;
 641        fsize->stepwise.step_width = 2;
 642        fsize->stepwise.step_height = 2;
 643
 644        return 0;
 645}
 646
 647/* sub-driver description */
 648static const struct sd_desc sd_desc = {
 649        .name = MODULE_NAME,
 650        .config = sd_config,
 651        .init = sd_init,
 652        .init_controls = sd_init_controls,
 653        .start = sd_start,
 654        .stopN = sd_stopN,
 655        .pkt_scan = sd_pkt_scan,
 656        .dq_callback = stk1135_dq_callback,
 657        .try_fmt = stk1135_try_fmt,
 658        .enum_framesizes = stk1135_enum_framesizes,
 659};
 660
 661/* -- module initialisation -- */
 662static const struct usb_device_id device_table[] = {
 663        {USB_DEVICE(0x174f, 0x6a31)},   /* ASUS laptop, MT9M112 sensor */
 664        {}
 665};
 666MODULE_DEVICE_TABLE(usb, device_table);
 667
 668/* -- device connect -- */
 669static int sd_probe(struct usb_interface *intf,
 670                        const struct usb_device_id *id)
 671{
 672        return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 673                                THIS_MODULE);
 674}
 675
 676static struct usb_driver sd_driver = {
 677        .name = MODULE_NAME,
 678        .id_table = device_table,
 679        .probe = sd_probe,
 680        .disconnect = gspca_disconnect,
 681#ifdef CONFIG_PM
 682        .suspend = gspca_suspend,
 683        .resume = gspca_resume,
 684        .reset_resume = gspca_resume,
 685#endif
 686};
 687
 688module_usb_driver(sd_driver);
 689