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
  31 MODULE_AUTHOR("Ondrej Zary");
  32 MODULE_DESCRIPTION("Syntek STK1135 USB Camera Driver");
  33 MODULE_LICENSE("GPL");
  34
  35
  36 /* specific webcam descriptor */
  37 struct 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
  50 static 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 -- */
  59 static 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 -- */
  85 static 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
 107 static 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 */
 114 static 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
 122 static 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
 139 static 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
 153 static 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
 159 static 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
 173 static 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
 179 static 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
 189 static 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
 195 static 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
 201 static 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
 208 struct sensor_val {
 209         u16 reg;
 210         u16 val;
 211 };
 212
 213 /* configure MT9M112 sensor */
 214 static 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
 338 static 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
 369 static 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 */
 394 static 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 -- */
 442 static 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
 483 static 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
 494 static 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
 544 static 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
 553 static 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
 562 static 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
 573 static 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
 595 static const struct v4l2_ctrl_ops sd_ctrl_ops = {
 596         .s_ctrl = sd_s_ctrl,
 597 };
 598
 599 static 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
 618 static 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
 630 static 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 */
 648 static 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 -- */
 662 static const struct usb_device_id device_table[] = {
 663         {USB_DEVICE(0x174f, 0x6a31)},   /* ASUS laptop, MT9M112 sensor */
 664         {}
 665 };
 666 MODULE_DEVICE_TABLE(usb, device_table);
 667
 668 /* -- device connect -- */
 669 static 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
 676 static 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
 688 module_usb_driver(sd_driver);