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