drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c

   1 /*
   2  * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
   3  *                    Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
   4  * Copyright (c) 2002, 2003 Tuukka Toivonen
   5  * Copyright (c) 2008 Erik Andrén
   6  * Copyright (c) 2008 Chia-I Wu
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * P/N 861037:      Sensor HDCS1000        ASIC STV0600
  19  * P/N 861050-0010: Sensor HDCS1000        ASIC STV0600
  20  * P/N 861050-0020: Sensor Photobit PB100  ASIC STV0600-1 - QuickCam Express
  21  * P/N 861055:      Sensor ST VV6410       ASIC STV0610   - LEGO cam
  22  * P/N 861075-0040: Sensor HDCS1000        ASIC
  23  * P/N 961179-0700: Sensor ST VV6410       ASIC STV0602   - Dexxa WebCam USB
  24  * P/N 861040-0000: Sensor ST VV6410       ASIC STV0610   - QuickCam Web
  25  */
  26
  27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  28
  29 #include "stv06xx_hdcs.h"
  30
  31 static struct v4l2_pix_format hdcs1x00_mode[] = {
  32         {
  33                 HDCS_1X00_DEF_WIDTH,
  34                 HDCS_1X00_DEF_HEIGHT,
  35                 V4L2_PIX_FMT_SGRBG8,
  36                 V4L2_FIELD_NONE,
  37                 .sizeimage =
  38                         HDCS_1X00_DEF_WIDTH * HDCS_1X00_DEF_HEIGHT,
  39                 .bytesperline = HDCS_1X00_DEF_WIDTH,
  40                 .colorspace = V4L2_COLORSPACE_SRGB,
  41                 .priv = 1
  42         }
  43 };
  44
  45 static struct v4l2_pix_format hdcs1020_mode[] = {
  46         {
  47                 HDCS_1020_DEF_WIDTH,
  48                 HDCS_1020_DEF_HEIGHT,
  49                 V4L2_PIX_FMT_SGRBG8,
  50                 V4L2_FIELD_NONE,
  51                 .sizeimage =
  52                         HDCS_1020_DEF_WIDTH * HDCS_1020_DEF_HEIGHT,
  53                 .bytesperline = HDCS_1020_DEF_WIDTH,
  54                 .colorspace = V4L2_COLORSPACE_SRGB,
  55                 .priv = 1
  56         }
  57 };
  58
  59 enum hdcs_power_state {
  60         HDCS_STATE_SLEEP,
  61         HDCS_STATE_IDLE,
  62         HDCS_STATE_RUN
  63 };
  64
  65 /* no lock? */
  66 struct hdcs {
  67         enum hdcs_power_state state;
  68         int w, h;
  69
  70         /* visible area of the sensor array */
  71         struct {
  72                 int left, top;
  73                 int width, height;
  74                 int border;
  75         } array;
  76
  77         struct {
  78                 /* Column timing overhead */
  79                 u8 cto;
  80                 /* Column processing overhead */
  81                 u8 cpo;
  82                 /* Row sample period constant */
  83                 u16 rs;
  84                 /* Exposure reset duration */
  85                 u16 er;
  86         } exp;
  87
  88         int psmp;
  89 };
  90
  91 static int hdcs_reg_write_seq(struct sd *sd, u8 reg, u8 *vals, u8 len)
  92 {
  93         u8 regs[I2C_MAX_BYTES * 2];
  94         int i;
  95
  96         if (unlikely((len <= 0) || (len >= I2C_MAX_BYTES) ||
  97                      (reg + len > 0xff)))
  98                 return -EINVAL;
  99
 100         for (i = 0; i < len; i++) {
 101                 regs[2 * i] = reg;
 102                 regs[2 * i + 1] = vals[i];
 103                 /* All addresses are shifted left one bit
 104                  * as bit 0 toggles r/w */
 105                 reg += 2;
 106         }
 107
 108         return stv06xx_write_sensor_bytes(sd, regs, len);
 109 }
 110
 111 static int hdcs_set_state(struct sd *sd, enum hdcs_power_state state)
 112 {
 113         struct hdcs *hdcs = sd->sensor_priv;
 114         u8 val;
 115         int ret;
 116
 117         if (hdcs->state == state)
 118                 return 0;
 119
 120         /* we need to go idle before running or sleeping */
 121         if (hdcs->state != HDCS_STATE_IDLE) {
 122                 ret = stv06xx_write_sensor(sd, HDCS_REG_CONTROL(sd), 0);
 123                 if (ret)
 124                         return ret;
 125         }
 126
 127         hdcs->state = HDCS_STATE_IDLE;
 128
 129         if (state == HDCS_STATE_IDLE)
 130                 return 0;
 131
 132         switch (state) {
 133         case HDCS_STATE_SLEEP:
 134                 val = HDCS_SLEEP_MODE;
 135                 break;
 136
 137         case HDCS_STATE_RUN:
 138                 val = HDCS_RUN_ENABLE;
 139                 break;
 140
 141         default:
 142                 return -EINVAL;
 143         }
 144
 145         ret = stv06xx_write_sensor(sd, HDCS_REG_CONTROL(sd), val);
 146
 147         /* Update the state if the write succeeded */
 148         if (!ret)
 149                 hdcs->state = state;
 150
 151         return ret;
 152 }
 153
 154 static int hdcs_reset(struct sd *sd)
 155 {
 156         struct hdcs *hdcs = sd->sensor_priv;
 157         int err;
 158
 159         err = stv06xx_write_sensor(sd, HDCS_REG_CONTROL(sd), 1);
 160         if (err < 0)
 161                 return err;
 162
 163         err = stv06xx_write_sensor(sd, HDCS_REG_CONTROL(sd), 0);
 164         if (err < 0)
 165                 hdcs->state = HDCS_STATE_IDLE;
 166
 167         return err;
 168 }
 169
 170 static int hdcs_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
 171 {
 172         struct sd *sd = (struct sd *) gspca_dev;
 173         struct hdcs *hdcs = sd->sensor_priv;
 174         int rowexp, srowexp;
 175         int max_srowexp;
 176         /* Column time period */
 177         int ct;
 178         /* Column processing period */
 179         int cp;
 180         /* Row processing period */
 181         int rp;
 182         /* Minimum number of column timing periods
 183            within the column processing period */
 184         int mnct;
 185         int cycles, err;
 186         u8 exp[14];
 187
 188         cycles = val * HDCS_CLK_FREQ_MHZ * 257;
 189
 190         ct = hdcs->exp.cto + hdcs->psmp + (HDCS_ADC_START_SIG_DUR + 2);
 191         cp = hdcs->exp.cto + (hdcs->w * ct / 2);
 192
 193         /* the cycles one row takes */
 194         rp = hdcs->exp.rs + cp;
 195
 196         rowexp = cycles / rp;
 197
 198         /* the remaining cycles */
 199         cycles -= rowexp * rp;
 200
 201         /* calculate sub-row exposure */
 202         if (IS_1020(sd)) {
 203                 /* see HDCS-1020 datasheet 3.5.6.4, p. 63 */
 204                 srowexp = hdcs->w - (cycles + hdcs->exp.er + 13) / ct;
 205
 206                 mnct = (hdcs->exp.er + 12 + ct - 1) / ct;
 207                 max_srowexp = hdcs->w - mnct;
 208         } else {
 209                 /* see HDCS-1000 datasheet 3.4.5.5, p. 61 */
 210                 srowexp = cp - hdcs->exp.er - 6 - cycles;
 211
 212                 mnct = (hdcs->exp.er + 5 + ct - 1) / ct;
 213                 max_srowexp = cp - mnct * ct - 1;
 214         }
 215
 216         if (srowexp < 0)
 217                 srowexp = 0;
 218         else if (srowexp > max_srowexp)
 219                 srowexp = max_srowexp;
 220
 221         if (IS_1020(sd)) {
 222                 exp[0] = HDCS20_CONTROL;
 223                 exp[1] = 0x00;          /* Stop streaming */
 224                 exp[2] = HDCS_ROWEXPL;
 225                 exp[3] = rowexp & 0xff;
 226                 exp[4] = HDCS_ROWEXPH;
 227                 exp[5] = rowexp >> 8;
 228                 exp[6] = HDCS20_SROWEXP;
 229                 exp[7] = (srowexp >> 2) & 0xff;
 230                 exp[8] = HDCS20_ERROR;
 231                 exp[9] = 0x10;          /* Clear exposure error flag*/
 232                 exp[10] = HDCS20_CONTROL;
 233                 exp[11] = 0x04;         /* Restart streaming */
 234                 err = stv06xx_write_sensor_bytes(sd, exp, 6);
 235         } else {
 236                 exp[0] = HDCS00_CONTROL;
 237                 exp[1] = 0x00;         /* Stop streaming */
 238                 exp[2] = HDCS_ROWEXPL;
 239                 exp[3] = rowexp & 0xff;
 240                 exp[4] = HDCS_ROWEXPH;
 241                 exp[5] = rowexp >> 8;
 242                 exp[6] = HDCS00_SROWEXPL;
 243                 exp[7] = srowexp & 0xff;
 244                 exp[8] = HDCS00_SROWEXPH;
 245                 exp[9] = srowexp >> 8;
 246                 exp[10] = HDCS_STATUS;
 247                 exp[11] = 0x10;         /* Clear exposure error flag*/
 248                 exp[12] = HDCS00_CONTROL;
 249                 exp[13] = 0x04;         /* Restart streaming */
 250                 err = stv06xx_write_sensor_bytes(sd, exp, 7);
 251                 if (err < 0)
 252                         return err;
 253         }
 254         gspca_dbg(gspca_dev, D_CONF, "Writing exposure %d, rowexp %d, srowexp %d\n",
 255                   val, rowexp, srowexp);
 256         return err;
 257 }
 258
 259 static int hdcs_set_gains(struct sd *sd, u8 g)
 260 {
 261         int err;
 262         u8 gains[4];
 263
 264         /* the voltage gain Av = (1 + 19 * val / 127) * (1 + bit7) */
 265         if (g > 127)
 266                 g = 0x80 | (g / 2);
 267
 268         gains[0] = g;
 269         gains[1] = g;
 270         gains[2] = g;
 271         gains[3] = g;
 272
 273         err = hdcs_reg_write_seq(sd, HDCS_ERECPGA, gains, 4);
 274         return err;
 275 }
 276
 277 static int hdcs_set_gain(struct gspca_dev *gspca_dev, __s32 val)
 278 {
 279         gspca_dbg(gspca_dev, D_CONF, "Writing gain %d\n", val);
 280         return hdcs_set_gains((struct sd *) gspca_dev,
 281                                val & 0xff);
 282 }
 283
 284 static int hdcs_set_size(struct sd *sd,
 285                 unsigned int width, unsigned int height)
 286 {
 287         struct hdcs *hdcs = sd->sensor_priv;
 288         u8 win[4];
 289         unsigned int x, y;
 290         int err;
 291
 292         /* must be multiple of 4 */
 293         width = (width + 3) & ~0x3;
 294         height = (height + 3) & ~0x3;
 295
 296         if (width > hdcs->array.width)
 297                 width = hdcs->array.width;
 298
 299         if (IS_1020(sd)) {
 300                 /* the borders are also invalid */
 301                 if (height + 2 * hdcs->array.border + HDCS_1020_BOTTOM_Y_SKIP
 302                                   > hdcs->array.height)
 303                         height = hdcs->array.height - 2 * hdcs->array.border -
 304                                 HDCS_1020_BOTTOM_Y_SKIP;
 305
 306                 y = (hdcs->array.height - HDCS_1020_BOTTOM_Y_SKIP - height) / 2
 307                                 + hdcs->array.top;
 308         } else {
 309                 if (height > hdcs->array.height)
 310                         height = hdcs->array.height;
 311
 312                 y = hdcs->array.top + (hdcs->array.height - height) / 2;
 313         }
 314
 315         x = hdcs->array.left + (hdcs->array.width - width) / 2;
 316
 317         win[0] = y / 4;
 318         win[1] = x / 4;
 319         win[2] = (y + height) / 4 - 1;
 320         win[3] = (x + width) / 4 - 1;
 321
 322         err = hdcs_reg_write_seq(sd, HDCS_FWROW, win, 4);
 323         if (err < 0)
 324                 return err;
 325
 326         /* Update the current width and height */
 327         hdcs->w = width;
 328         hdcs->h = height;
 329         return err;
 330 }
 331
 332 static int hdcs_s_ctrl(struct v4l2_ctrl *ctrl)
 333 {
 334         struct gspca_dev *gspca_dev =
 335                 container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
 336         int err = -EINVAL;
 337
 338         switch (ctrl->id) {
 339         case V4L2_CID_GAIN:
 340                 err = hdcs_set_gain(gspca_dev, ctrl->val);
 341                 break;
 342         case V4L2_CID_EXPOSURE:
 343                 err = hdcs_set_exposure(gspca_dev, ctrl->val);
 344                 break;
 345         }
 346         return err;
 347 }
 348
 349 static const struct v4l2_ctrl_ops hdcs_ctrl_ops = {
 350         .s_ctrl = hdcs_s_ctrl,
 351 };
 352
 353 static int hdcs_init_controls(struct sd *sd)
 354 {
 355         struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
 356
 357         v4l2_ctrl_handler_init(hdl, 2);
 358         v4l2_ctrl_new_std(hdl, &hdcs_ctrl_ops,
 359                         V4L2_CID_EXPOSURE, 0, 0xff, 1, HDCS_DEFAULT_EXPOSURE);
 360         v4l2_ctrl_new_std(hdl, &hdcs_ctrl_ops,
 361                         V4L2_CID_GAIN, 0, 0xff, 1, HDCS_DEFAULT_GAIN);
 362         return hdl->error;
 363 }
 364
 365 static int hdcs_probe_1x00(struct sd *sd)
 366 {
 367         struct hdcs *hdcs;
 368         u16 sensor;
 369         int ret;
 370
 371         ret = stv06xx_read_sensor(sd, HDCS_IDENT, &sensor);
 372         if (ret < 0 || sensor != 0x08)
 373                 return -ENODEV;
 374
 375         pr_info("HDCS-1000/1100 sensor detected\n");
 376
 377         sd->gspca_dev.cam.cam_mode = hdcs1x00_mode;
 378         sd->gspca_dev.cam.nmodes = ARRAY_SIZE(hdcs1x00_mode);
 379
 380         hdcs = kmalloc(sizeof(struct hdcs), GFP_KERNEL);
 381         if (!hdcs)
 382                 return -ENOMEM;
 383
 384         hdcs->array.left = 8;
 385         hdcs->array.top = 8;
 386         hdcs->array.width = HDCS_1X00_DEF_WIDTH;
 387         hdcs->array.height = HDCS_1X00_DEF_HEIGHT;
 388         hdcs->array.border = 4;
 389
 390         hdcs->exp.cto = 4;
 391         hdcs->exp.cpo = 2;
 392         hdcs->exp.rs = 186;
 393         hdcs->exp.er = 100;
 394
 395         /*
 396          * Frame rate on HDCS-1000 with STV600 depends on PSMP:
 397          *  4 = doesn't work at all
 398          *  5 = 7.8 fps,
 399          *  6 = 6.9 fps,
 400          *  8 = 6.3 fps,
 401          * 10 = 5.5 fps,
 402          * 15 = 4.4 fps,
 403          * 31 = 2.8 fps
 404          *
 405          * Frame rate on HDCS-1000 with STV602 depends on PSMP:
 406          * 15 = doesn't work at all
 407          * 18 = doesn't work at all
 408          * 19 = 7.3 fps
 409          * 20 = 7.4 fps
 410          * 21 = 7.4 fps
 411          * 22 = 7.4 fps
 412          * 24 = 6.3 fps
 413          * 30 = 5.4 fps
 414          */
 415         hdcs->psmp = (sd->bridge == BRIDGE_STV602) ? 20 : 5;
 416
 417         sd->sensor_priv = hdcs;
 418
 419         return 0;
 420 }
 421
 422 static int hdcs_probe_1020(struct sd *sd)
 423 {
 424         struct hdcs *hdcs;
 425         u16 sensor;
 426         int ret;
 427
 428         ret = stv06xx_read_sensor(sd, HDCS_IDENT, &sensor);
 429         if (ret < 0 || sensor != 0x10)
 430                 return -ENODEV;
 431
 432         pr_info("HDCS-1020 sensor detected\n");
 433
 434         sd->gspca_dev.cam.cam_mode = hdcs1020_mode;
 435         sd->gspca_dev.cam.nmodes = ARRAY_SIZE(hdcs1020_mode);
 436
 437         hdcs = kmalloc(sizeof(struct hdcs), GFP_KERNEL);
 438         if (!hdcs)
 439                 return -ENOMEM;
 440
 441         /*
 442          * From Andrey's test image: looks like HDCS-1020 upper-left
 443          * visible pixel is at 24,8 (y maybe even smaller?) and lower-right
 444          * visible pixel at 375,299 (x maybe even larger?)
 445          */
 446         hdcs->array.left = 24;
 447         hdcs->array.top  = 4;
 448         hdcs->array.width = HDCS_1020_DEF_WIDTH;
 449         hdcs->array.height = 304;
 450         hdcs->array.border = 4;
 451
 452         hdcs->psmp = 6;
 453
 454         hdcs->exp.cto = 3;
 455         hdcs->exp.cpo = 3;
 456         hdcs->exp.rs = 155;
 457         hdcs->exp.er = 96;
 458
 459         sd->sensor_priv = hdcs;
 460
 461         return 0;
 462 }
 463
 464 static int hdcs_start(struct sd *sd)
 465 {
 466         struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
 467
 468         gspca_dbg(gspca_dev, D_STREAM, "Starting stream\n");
 469
 470         return hdcs_set_state(sd, HDCS_STATE_RUN);
 471 }
 472
 473 static int hdcs_stop(struct sd *sd)
 474 {
 475         struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
 476
 477         gspca_dbg(gspca_dev, D_STREAM, "Halting stream\n");
 478
 479         return hdcs_set_state(sd, HDCS_STATE_SLEEP);
 480 }
 481
 482 static int hdcs_init(struct sd *sd)
 483 {
 484         struct hdcs *hdcs = sd->sensor_priv;
 485         int i, err = 0;
 486
 487         /* Set the STV0602AA in STV0600 emulation mode */
 488         if (sd->bridge == BRIDGE_STV602)
 489                 stv06xx_write_bridge(sd, STV_STV0600_EMULATION, 1);
 490
 491         /* Execute the bridge init */
 492         for (i = 0; i < ARRAY_SIZE(stv_bridge_init) && !err; i++) {
 493                 err = stv06xx_write_bridge(sd, stv_bridge_init[i][0],
 494                                            stv_bridge_init[i][1]);
 495         }
 496         if (err < 0)
 497                 return err;
 498
 499         /* sensor soft reset */
 500         hdcs_reset(sd);
 501
 502         /* Execute the sensor init */
 503         for (i = 0; i < ARRAY_SIZE(stv_sensor_init) && !err; i++) {
 504                 err = stv06xx_write_sensor(sd, stv_sensor_init[i][0],
 505                                              stv_sensor_init[i][1]);
 506         }
 507         if (err < 0)
 508                 return err;
 509
 510         /* Enable continuous frame capture, bit 2: stop when frame complete */
 511         err = stv06xx_write_sensor(sd, HDCS_REG_CONFIG(sd), BIT(3));
 512         if (err < 0)
 513                 return err;
 514
 515         /* Set PGA sample duration
 516         (was 0x7E for the STV602, but caused slow framerate with HDCS-1020) */
 517         if (IS_1020(sd))
 518                 err = stv06xx_write_sensor(sd, HDCS_TCTRL,
 519                                 (HDCS_ADC_START_SIG_DUR << 6) | hdcs->psmp);
 520         else
 521                 err = stv06xx_write_sensor(sd, HDCS_TCTRL,
 522                                 (HDCS_ADC_START_SIG_DUR << 5) | hdcs->psmp);
 523         if (err < 0)
 524                 return err;
 525
 526         return hdcs_set_size(sd, hdcs->array.width, hdcs->array.height);
 527 }
 528
 529 static int hdcs_dump(struct sd *sd)
 530 {
 531         u16 reg, val;
 532
 533         pr_info("Dumping sensor registers:\n");
 534
 535         for (reg = HDCS_IDENT; reg <= HDCS_ROWEXPH; reg++) {
 536                 stv06xx_read_sensor(sd, reg, &val);
 537                 pr_info("reg 0x%02x = 0x%02x\n", reg, val);
 538         }
 539         return 0;
 540 }