drivers/media/i2c/tw9900.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for the Techwell TW9900 multi-standard video decoder.
   4  *
   5  * Copyright (C) 2018 Fuzhou Rockchip Electronics Co., Ltd.
   6  * Copyright (C) 2020 Maxime Chevallier <[email protected]>
   7  * Copyright (C) 2023 Mehdi Djait <[email protected]>
   8  */
   9
  10 #include <linux/bitfield.h>
  11 #include <linux/clk.h>
  12 #include <linux/delay.h>
  13 #include <linux/device.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/i2c.h>
  16 #include <linux/module.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/regulator/consumer.h>
  19 #include <media/media-entity.h>
  20 #include <media/v4l2-async.h>
  21 #include <media/v4l2-ctrls.h>
  22 #include <media/v4l2-event.h>
  23 #include <media/v4l2-subdev.h>
  24
  25 #define TW9900_REG_CHIP_ID                      0x00
  26 #define TW9900_REG_CHIP_STATUS                  0x01
  27 #define TW9900_REG_CHIP_STATUS_VDLOSS           BIT(7)
  28 #define TW9900_REG_CHIP_STATUS_HLOCK            BIT(6)
  29 #define TW9900_REG_OUT_FMT_CTL                  0x03
  30 #define TW9900_REG_OUT_FMT_CTL_STANDBY          0xA7
  31 #define TW9900_REG_OUT_FMT_CTL_STREAMING        0xA0
  32 #define TW9900_REG_CKHY_HSDLY                   0x04
  33 #define TW9900_REG_OUT_CTRL_I                   0x05
  34 #define TW9900_REG_ANALOG_CTL                   0x06
  35 #define TW9900_REG_CROP_HI                      0x07
  36 #define TW9900_REG_VDELAY_LO                    0x08
  37 #define TW9900_REG_VACTIVE_LO                   0x09
  38 #define TW9900_REG_HACTIVE_LO                   0x0B
  39 #define TW9900_REG_CNTRL1                       0x0C
  40 #define TW9900_REG_BRIGHT_CTL                   0x10
  41 #define TW9900_REG_CONTRAST_CTL                 0x11
  42 #define TW9900_REG_VBI_CNTL                     0x19
  43 #define TW9900_REG_ANAL_CTL_II                  0x1A
  44 #define TW9900_REG_OUT_CTRL_II                  0x1B
  45 #define TW9900_REG_STD                          0x1C
  46 #define TW9900_REG_STD_AUTO_PROGRESS            BIT(7)
  47 #define TW9900_STDNOW_MASK                      GENMASK(6, 4)
  48 #define TW9900_REG_STDR                         0x1D
  49 #define TW9900_REG_MISSCNT                      0x26
  50 #define TW9900_REG_MISC_CTL_II                  0x2F
  51 #define TW9900_REG_VVBI                         0x55
  52
  53 #define TW9900_CHIP_ID                          0x00
  54 #define TW9900_STD_NTSC_M                       0
  55 #define TW9900_STD_PAL_BDGHI                    1
  56 #define TW9900_STD_AUTO                         7
  57
  58 #define TW9900_VIDEO_POLL_TRIES                 20
  59
  60 struct regval {
  61         u8 addr;
  62         u8 val;
  63 };
  64
  65 struct tw9900_mode {
  66         u32 width;
  67         u32 height;
  68         u32 std;
  69         const struct regval *reg_list;
  70         int n_regs;
  71 };
  72
  73 struct tw9900 {
  74         struct i2c_client *client;
  75         struct gpio_desc *reset_gpio;
  76         struct regulator *regulator;
  77
  78         struct v4l2_subdev subdev;
  79         struct v4l2_ctrl_handler hdl;
  80         struct media_pad pad;
  81
  82         /* Serialize access to hardware and global state. */
  83         struct mutex mutex;
  84
  85         bool streaming;
  86         const struct tw9900_mode *cur_mode;
  87 };
  88
  89 #define to_tw9900(sd) container_of(sd, struct tw9900, subdev)
  90
  91 static const struct regval tw9900_init_regs[] = {
  92         { TW9900_REG_MISC_CTL_II,       0xE6 },
  93         { TW9900_REG_MISSCNT,           0x24 },
  94         { TW9900_REG_OUT_FMT_CTL,       0xA7 },
  95         { TW9900_REG_ANAL_CTL_II,       0x0A },
  96         { TW9900_REG_VDELAY_LO,         0x19 },
  97         { TW9900_REG_STD,               0x00 },
  98         { TW9900_REG_VACTIVE_LO,        0xF0 },
  99         { TW9900_REG_STD,               0x07 },
 100         { TW9900_REG_CKHY_HSDLY,        0x00 },
 101         { TW9900_REG_ANALOG_CTL,        0x80 },
 102         { TW9900_REG_CNTRL1,            0xDC },
 103         { TW9900_REG_OUT_CTRL_I,        0x98 },
 104 };
 105
 106 static const struct regval tw9900_pal_regs[] = {
 107         { TW9900_REG_STD,               0x01 },
 108 };
 109
 110 static const struct regval tw9900_ntsc_regs[] = {
 111         { TW9900_REG_OUT_FMT_CTL,       0xA4 },
 112         { TW9900_REG_VDELAY_LO,         0x12 },
 113         { TW9900_REG_VACTIVE_LO,        0xF0 },
 114         { TW9900_REG_CROP_HI,           0x02 },
 115         { TW9900_REG_HACTIVE_LO,        0xD0 },
 116         { TW9900_REG_VBI_CNTL,          0x01 },
 117         { TW9900_REG_STD,               0x00 },
 118 };
 119
 120 static const struct tw9900_mode supported_modes[] = {
 121         {
 122                 .width = 720,
 123                 .height = 480,
 124                 .std = V4L2_STD_NTSC,
 125                 .reg_list = tw9900_ntsc_regs,
 126                 .n_regs = ARRAY_SIZE(tw9900_ntsc_regs),
 127         },
 128         {
 129                 .width = 720,
 130                 .height = 576,
 131                 .std = V4L2_STD_PAL,
 132                 .reg_list = tw9900_pal_regs,
 133                 .n_regs = ARRAY_SIZE(tw9900_pal_regs),
 134         },
 135 };
 136
 137 static int tw9900_write_reg(struct i2c_client *client, u8 reg, u8 val)
 138 {
 139         int ret;
 140
 141         ret = i2c_smbus_write_byte_data(client, reg, val);
 142         if (ret < 0)
 143                 dev_err(&client->dev, "write reg error: %d\n", ret);
 144
 145         return ret;
 146 }
 147
 148 static int tw9900_write_array(struct i2c_client *client,
 149                               const struct regval *regs, int n_regs)
 150 {
 151         int i, ret = 0;
 152
 153         for (i = 0; i < n_regs; i++) {
 154                 ret = tw9900_write_reg(client, regs[i].addr, regs[i].val);
 155                 if (ret)
 156                         return ret;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int tw9900_read_reg(struct i2c_client *client, u8 reg)
 163 {
 164         int ret;
 165
 166         ret = i2c_smbus_read_byte_data(client, reg);
 167         if (ret < 0)
 168                 dev_err(&client->dev, "read reg error: %d\n", ret);
 169
 170         return ret;
 171 }
 172
 173 static void tw9900_fill_fmt(const struct tw9900_mode *mode,
 174                             struct v4l2_mbus_framefmt *fmt)
 175 {
 176         fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
 177         fmt->width = mode->width;
 178         fmt->height = mode->height;
 179         fmt->field = V4L2_FIELD_NONE;
 180         fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
 181         fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
 182         fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(V4L2_COLORSPACE_SMPTE170M);
 183         fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(V4L2_COLORSPACE_SMPTE170M);
 184 }
 185
 186 static int tw9900_get_fmt(struct v4l2_subdev *sd,
 187                           struct v4l2_subdev_state *sd_state,
 188                           struct v4l2_subdev_format *fmt)
 189 {
 190         struct tw9900 *tw9900 = to_tw9900(sd);
 191         struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
 192
 193         mutex_lock(&tw9900->mutex);
 194         tw9900_fill_fmt(tw9900->cur_mode, mbus_fmt);
 195         mutex_unlock(&tw9900->mutex);
 196
 197         return 0;
 198 }
 199
 200 static int tw9900_set_fmt(struct v4l2_subdev *sd,
 201                           struct v4l2_subdev_state *sd_state,
 202                           struct v4l2_subdev_format *fmt)
 203 {
 204         struct tw9900 *tw9900 = to_tw9900(sd);
 205         struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
 206
 207         mutex_lock(&tw9900->mutex);
 208
 209         if (tw9900->streaming) {
 210                 mutex_unlock(&tw9900->mutex);
 211                 return -EBUSY;
 212         }
 213
 214         tw9900_fill_fmt(tw9900->cur_mode, mbus_fmt);
 215
 216         mutex_unlock(&tw9900->mutex);
 217
 218         return 0;
 219 }
 220
 221 static int tw9900_enum_mbus_code(struct v4l2_subdev *sd,
 222                                  struct v4l2_subdev_state *sd_state,
 223                                  struct v4l2_subdev_mbus_code_enum *code)
 224 {
 225         if (code->index > 0)
 226                 return -EINVAL;
 227
 228         code->code = MEDIA_BUS_FMT_UYVY8_2X8;
 229
 230         return 0;
 231 }
 232
 233 static int tw9900_s_ctrl(struct v4l2_ctrl *ctrl)
 234 {
 235         struct tw9900 *tw9900 = container_of(ctrl->handler, struct tw9900, hdl);
 236         int ret;
 237
 238         if (pm_runtime_suspended(&tw9900->client->dev))
 239                 return 0;
 240
 241         /* v4l2_ctrl_lock() locks tw9900->mutex. */
 242         switch (ctrl->id) {
 243         case V4L2_CID_BRIGHTNESS:
 244                 ret = tw9900_write_reg(tw9900->client, TW9900_REG_BRIGHT_CTL,
 245                                        (u8)ctrl->val);
 246                 break;
 247         case V4L2_CID_CONTRAST:
 248                 ret = tw9900_write_reg(tw9900->client, TW9900_REG_CONTRAST_CTL,
 249                                        (u8)ctrl->val);
 250                 break;
 251         default:
 252                 ret = -EINVAL;
 253                 break;
 254         }
 255
 256         return ret;
 257 }
 258
 259 static int tw9900_s_stream(struct v4l2_subdev *sd, int on)
 260 {
 261         struct tw9900 *tw9900 = to_tw9900(sd);
 262         struct i2c_client *client = tw9900->client;
 263         int ret;
 264
 265         mutex_lock(&tw9900->mutex);
 266
 267         if (tw9900->streaming == on) {
 268                 mutex_unlock(&tw9900->mutex);
 269                 return 0;
 270         }
 271
 272         mutex_unlock(&tw9900->mutex);
 273
 274         if (on) {
 275                 ret = pm_runtime_resume_and_get(&client->dev);
 276                 if (ret < 0)
 277                         return ret;
 278
 279                 mutex_lock(&tw9900->mutex);
 280
 281                 ret = __v4l2_ctrl_handler_setup(sd->ctrl_handler);
 282                 if (ret)
 283                         goto err_unlock;
 284
 285                 ret = tw9900_write_array(tw9900->client,
 286                                          tw9900->cur_mode->reg_list,
 287                                          tw9900->cur_mode->n_regs);
 288                 if (ret)
 289                         goto err_unlock;
 290
 291                 ret = tw9900_write_reg(client, TW9900_REG_OUT_FMT_CTL,
 292                                        TW9900_REG_OUT_FMT_CTL_STREAMING);
 293                 if (ret)
 294                         goto err_unlock;
 295
 296                 tw9900->streaming = on;
 297
 298                 mutex_unlock(&tw9900->mutex);
 299
 300         } else {
 301                 mutex_lock(&tw9900->mutex);
 302
 303                 ret = tw9900_write_reg(client, TW9900_REG_OUT_FMT_CTL,
 304                                        TW9900_REG_OUT_FMT_CTL_STANDBY);
 305                 if (ret)
 306                         goto err_unlock;
 307
 308                 tw9900->streaming = on;
 309
 310                 mutex_unlock(&tw9900->mutex);
 311
 312                 pm_runtime_put(&client->dev);
 313         }
 314
 315         return 0;
 316
 317 err_unlock:
 318         mutex_unlock(&tw9900->mutex);
 319         pm_runtime_put(&client->dev);
 320
 321         return ret;
 322 }
 323
 324 static int tw9900_subscribe_event(struct v4l2_subdev *sd,
 325                                   struct v4l2_fh *fh,
 326                                   struct v4l2_event_subscription *sub)
 327 {
 328         switch (sub->type) {
 329         case V4L2_EVENT_SOURCE_CHANGE:
 330                 return v4l2_src_change_event_subdev_subscribe(sd, fh, sub);
 331         case V4L2_EVENT_CTRL:
 332                 return v4l2_ctrl_subdev_subscribe_event(sd, fh, sub);
 333         default:
 334                 return -EINVAL;
 335         }
 336 }
 337
 338 static int tw9900_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
 339 {
 340         struct tw9900 *tw9900 = to_tw9900(sd);
 341         const struct tw9900_mode *mode = NULL;
 342         int i;
 343
 344         if (!(std & (V4L2_STD_NTSC | V4L2_STD_PAL)))
 345                 return -EINVAL;
 346
 347         for (i = 0; i < ARRAY_SIZE(supported_modes); i++)
 348                 if (supported_modes[i].std & std)
 349                         mode = &supported_modes[i];
 350         if (!mode)
 351                 return -EINVAL;
 352
 353         mutex_lock(&tw9900->mutex);
 354         tw9900->cur_mode = mode;
 355         mutex_unlock(&tw9900->mutex);
 356
 357         return 0;
 358 }
 359
 360 static int tw9900_get_stream_std(struct tw9900 *tw9900,
 361                                  v4l2_std_id *std)
 362 {
 363         int cur_std, ret;
 364
 365         lockdep_assert_held(&tw9900->mutex);
 366
 367         ret = tw9900_read_reg(tw9900->client, TW9900_REG_STD);
 368         if (ret < 0) {
 369                 *std = V4L2_STD_UNKNOWN;
 370                 return ret;
 371         }
 372
 373         cur_std = FIELD_GET(TW9900_STDNOW_MASK, ret);
 374         switch (cur_std) {
 375         case TW9900_STD_NTSC_M:
 376                 *std = V4L2_STD_NTSC;
 377                 break;
 378         case TW9900_STD_PAL_BDGHI:
 379                 *std = V4L2_STD_PAL;
 380                 break;
 381         case TW9900_STD_AUTO:
 382                 *std = V4L2_STD_UNKNOWN;
 383                 break;
 384         default:
 385                 *std = V4L2_STD_UNKNOWN;
 386                 break;
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int tw9900_g_std(struct v4l2_subdev *sd, v4l2_std_id *std)
 393 {
 394         struct tw9900 *tw9900 = to_tw9900(sd);
 395
 396         mutex_lock(&tw9900->mutex);
 397         *std = tw9900->cur_mode->std;
 398         mutex_unlock(&tw9900->mutex);
 399
 400         return 0;
 401 }
 402
 403 static int tw9900_start_autodetect(struct tw9900 *tw9900)
 404 {
 405         int ret;
 406
 407         lockdep_assert_held(&tw9900->mutex);
 408
 409         ret = tw9900_write_reg(tw9900->client, TW9900_REG_STDR,
 410                                BIT(TW9900_STD_NTSC_M) |
 411                                BIT(TW9900_STD_PAL_BDGHI));
 412         if (ret)
 413                 return ret;
 414
 415         ret = tw9900_write_reg(tw9900->client, TW9900_REG_STD,
 416                                TW9900_STD_AUTO);
 417         if (ret)
 418                 return ret;
 419
 420         ret = tw9900_write_reg(tw9900->client, TW9900_REG_STDR,
 421                                BIT(TW9900_STD_NTSC_M) |
 422                                BIT(TW9900_STD_PAL_BDGHI) |
 423                                BIT(TW9900_STD_AUTO));
 424         if (ret)
 425                 return ret;
 426
 427         /*
 428          * Autodetect takes a while to start, and during the starting sequence
 429          * the autodetection status is reported as done.
 430          */
 431         msleep(30);
 432
 433         return 0;
 434 }
 435
 436 static int tw9900_detect_done(struct tw9900 *tw9900, bool *done)
 437 {
 438         int ret;
 439
 440         lockdep_assert_held(&tw9900->mutex);
 441
 442         ret = tw9900_read_reg(tw9900->client, TW9900_REG_STD);
 443         if (ret < 0)
 444                 return ret;
 445
 446         *done = !(ret & TW9900_REG_STD_AUTO_PROGRESS);
 447
 448         return 0;
 449 }
 450
 451 static int tw9900_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
 452 {
 453         struct tw9900 *tw9900 = to_tw9900(sd);
 454         bool done = false;
 455         int i, ret;
 456
 457         mutex_lock(&tw9900->mutex);
 458
 459         if (tw9900->streaming) {
 460                 mutex_unlock(&tw9900->mutex);
 461                 return -EBUSY;
 462         }
 463
 464         mutex_unlock(&tw9900->mutex);
 465
 466         ret = pm_runtime_resume_and_get(&tw9900->client->dev);
 467         if (ret < 0)
 468                 return ret;
 469
 470         mutex_lock(&tw9900->mutex);
 471
 472         ret = tw9900_start_autodetect(tw9900);
 473         if (ret)
 474                 goto out_unlock;
 475
 476         for (i = 0; i < TW9900_VIDEO_POLL_TRIES; i++) {
 477                 ret = tw9900_detect_done(tw9900, &done);
 478                 if (ret)
 479                         goto out_unlock;
 480
 481                 if (done)
 482                         break;
 483
 484                 msleep(20);
 485         }
 486
 487         if (!done) {
 488                 ret = -ETIMEDOUT;
 489                 goto out_unlock;
 490         }
 491
 492         ret = tw9900_get_stream_std(tw9900, std);
 493
 494 out_unlock:
 495         mutex_unlock(&tw9900->mutex);
 496         pm_runtime_put(&tw9900->client->dev);
 497
 498         return ret;
 499 }
 500
 501 static int tw9900_g_tvnorms(struct v4l2_subdev *sd, v4l2_std_id *std)
 502 {
 503         *std = V4L2_STD_NTSC | V4L2_STD_PAL;
 504
 505         return 0;
 506 }
 507
 508 static int tw9900_g_input_status(struct v4l2_subdev *sd, u32 *status)
 509 {
 510         struct tw9900 *tw9900 = to_tw9900(sd);
 511         int ret;
 512
 513         mutex_lock(&tw9900->mutex);
 514
 515         if (tw9900->streaming) {
 516                 mutex_unlock(&tw9900->mutex);
 517                 return -EBUSY;
 518         }
 519
 520         mutex_unlock(&tw9900->mutex);
 521
 522         *status = V4L2_IN_ST_NO_SIGNAL;
 523
 524         ret = pm_runtime_resume_and_get(&tw9900->client->dev);
 525         if (ret < 0)
 526                 return ret;
 527
 528         mutex_lock(&tw9900->mutex);
 529         ret = tw9900_read_reg(tw9900->client, TW9900_REG_CHIP_STATUS);
 530         mutex_unlock(&tw9900->mutex);
 531
 532         pm_runtime_put(&tw9900->client->dev);
 533
 534         if (ret < 0)
 535                 return ret;
 536
 537         *status = ret & TW9900_REG_CHIP_STATUS_HLOCK ? 0 : V4L2_IN_ST_NO_SIGNAL;
 538
 539         return 0;
 540 }
 541
 542 static const struct v4l2_subdev_core_ops tw9900_core_ops = {
 543         .subscribe_event        = tw9900_subscribe_event,
 544         .unsubscribe_event      = v4l2_event_subdev_unsubscribe,
 545 };
 546
 547 static const struct v4l2_subdev_video_ops tw9900_video_ops = {
 548         .s_std          = tw9900_s_std,
 549         .g_std          = tw9900_g_std,
 550         .querystd       = tw9900_querystd,
 551         .g_tvnorms      = tw9900_g_tvnorms,
 552         .g_input_status = tw9900_g_input_status,
 553         .s_stream       = tw9900_s_stream,
 554 };
 555
 556 static const struct v4l2_subdev_pad_ops tw9900_pad_ops = {
 557         .enum_mbus_code = tw9900_enum_mbus_code,
 558         .get_fmt        = tw9900_get_fmt,
 559         .set_fmt        = tw9900_set_fmt,
 560 };
 561
 562 static const struct v4l2_subdev_ops tw9900_subdev_ops = {
 563         .core   = &tw9900_core_ops,
 564         .video  = &tw9900_video_ops,
 565         .pad    = &tw9900_pad_ops,
 566 };
 567
 568 static const struct v4l2_ctrl_ops tw9900_ctrl_ops = {
 569         .s_ctrl = tw9900_s_ctrl,
 570 };
 571
 572 static int tw9900_check_id(struct tw9900 *tw9900,
 573                            struct i2c_client *client)
 574 {
 575         struct device *dev = &tw9900->client->dev;
 576         int ret;
 577
 578         ret = pm_runtime_resume_and_get(&tw9900->client->dev);
 579         if (ret < 0)
 580                 return ret;
 581
 582         mutex_lock(&tw9900->mutex);
 583         ret = tw9900_read_reg(client, TW9900_CHIP_ID);
 584         mutex_unlock(&tw9900->mutex);
 585
 586         pm_runtime_put(&tw9900->client->dev);
 587
 588         if (ret < 0)
 589                 return ret;
 590
 591         if (ret != TW9900_CHIP_ID) {
 592                 dev_err(dev, "Unexpected decoder id %#x\n", ret);
 593                 return -ENODEV;
 594         }
 595
 596         return 0;
 597 }
 598
 599 static int tw9900_runtime_resume(struct device *dev)
 600 {
 601         struct i2c_client *client = to_i2c_client(dev);
 602         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 603         struct tw9900 *tw9900 = to_tw9900(sd);
 604         int ret;
 605
 606         mutex_lock(&tw9900->mutex);
 607
 608         if (tw9900->reset_gpio)
 609                 gpiod_set_value_cansleep(tw9900->reset_gpio, 1);
 610
 611         ret = regulator_enable(tw9900->regulator);
 612         if (ret < 0) {
 613                 mutex_unlock(&tw9900->mutex);
 614                 return ret;
 615         }
 616
 617         usleep_range(50000, 52000);
 618
 619         if (tw9900->reset_gpio)
 620                 gpiod_set_value_cansleep(tw9900->reset_gpio, 0);
 621
 622         usleep_range(1000, 2000);
 623
 624         ret = tw9900_write_array(tw9900->client, tw9900_init_regs,
 625                                  ARRAY_SIZE(tw9900_init_regs));
 626
 627         mutex_unlock(&tw9900->mutex);
 628
 629         /* This sleep is needed for the Horizontal Sync PLL to lock. */
 630         msleep(300);
 631
 632         return ret;
 633 }
 634
 635 static int tw9900_runtime_suspend(struct device *dev)
 636 {
 637         struct i2c_client *client = to_i2c_client(dev);
 638         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 639         struct tw9900 *tw9900 = to_tw9900(sd);
 640
 641         mutex_lock(&tw9900->mutex);
 642
 643         if (tw9900->reset_gpio)
 644                 gpiod_set_value_cansleep(tw9900->reset_gpio, 1);
 645
 646         regulator_disable(tw9900->regulator);
 647
 648         mutex_unlock(&tw9900->mutex);
 649
 650         return 0;
 651 }
 652
 653 static int tw9900_probe(struct i2c_client *client)
 654 {
 655         struct device *dev = &client->dev;
 656         struct v4l2_ctrl_handler *hdl;
 657         struct tw9900 *tw9900;
 658         int ret = 0;
 659
 660         tw9900 = devm_kzalloc(dev, sizeof(*tw9900), GFP_KERNEL);
 661         if (!tw9900)
 662                 return -ENOMEM;
 663
 664         tw9900->client = client;
 665         tw9900->cur_mode = &supported_modes[0];
 666
 667         tw9900->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 668                                                      GPIOD_OUT_LOW);
 669         if (IS_ERR(tw9900->reset_gpio))
 670                 return dev_err_probe(dev, PTR_ERR(tw9900->reset_gpio),
 671                                      "Failed to get reset gpio\n");
 672
 673         tw9900->regulator = devm_regulator_get(&tw9900->client->dev, "vdd");
 674         if (IS_ERR(tw9900->regulator))
 675                 return dev_err_probe(dev, PTR_ERR(tw9900->regulator),
 676                                      "Failed to get power regulator\n");
 677
 678         v4l2_i2c_subdev_init(&tw9900->subdev, client, &tw9900_subdev_ops);
 679         tw9900->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
 680                                 V4L2_SUBDEV_FL_HAS_EVENTS;
 681
 682         mutex_init(&tw9900->mutex);
 683
 684         hdl = &tw9900->hdl;
 685
 686         ret = v4l2_ctrl_handler_init(hdl, 2);
 687         if (ret)
 688                 goto err_destory_mutex;
 689
 690         hdl->lock = &tw9900->mutex;
 691
 692         v4l2_ctrl_new_std(hdl, &tw9900_ctrl_ops, V4L2_CID_BRIGHTNESS,
 693                           -128, 127, 1, 0);
 694         v4l2_ctrl_new_std(hdl, &tw9900_ctrl_ops, V4L2_CID_CONTRAST,
 695                           0, 255, 1, 0x60);
 696
 697         tw9900->subdev.ctrl_handler = hdl;
 698         if (hdl->error) {
 699                 ret = hdl->error;
 700                 goto err_free_handler;
 701         }
 702
 703         tw9900->pad.flags = MEDIA_PAD_FL_SOURCE;
 704         tw9900->subdev.entity.function = MEDIA_ENT_F_DV_DECODER;
 705
 706         ret = media_entity_pads_init(&tw9900->subdev.entity, 1, &tw9900->pad);
 707         if (ret < 0)
 708                 goto err_free_handler;
 709
 710         pm_runtime_set_suspended(dev);
 711         pm_runtime_enable(dev);
 712
 713         ret = tw9900_check_id(tw9900, client);
 714         if (ret)
 715                 goto err_disable_pm;
 716
 717         ret = v4l2_async_register_subdev(&tw9900->subdev);
 718         if (ret) {
 719                 dev_err(dev, "v4l2 async register subdev failed\n");
 720                 goto err_disable_pm;
 721         }
 722
 723         return 0;
 724
 725 err_disable_pm:
 726         pm_runtime_disable(dev);
 727         media_entity_cleanup(&tw9900->subdev.entity);
 728 err_free_handler:
 729         v4l2_ctrl_handler_free(hdl);
 730 err_destory_mutex:
 731         mutex_destroy(&tw9900->mutex);
 732
 733         return ret;
 734 }
 735
 736 static void tw9900_remove(struct i2c_client *client)
 737 {
 738         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 739         struct tw9900 *tw9900 = to_tw9900(sd);
 740
 741         v4l2_async_unregister_subdev(sd);
 742         media_entity_cleanup(&sd->entity);
 743         v4l2_ctrl_handler_free(sd->ctrl_handler);
 744
 745         pm_runtime_disable(&client->dev);
 746
 747         mutex_destroy(&tw9900->mutex);
 748 }
 749
 750 static const struct dev_pm_ops tw9900_pm_ops = {
 751         .runtime_suspend = tw9900_runtime_suspend,
 752         .runtime_resume = tw9900_runtime_resume,
 753 };
 754
 755 static const struct i2c_device_id tw9900_id[] = {
 756         { "tw9900" },
 757         { }
 758 };
 759 MODULE_DEVICE_TABLE(i2c, tw9900_id);
 760
 761 static const struct of_device_id tw9900_of_match[] = {
 762         { .compatible = "techwell,tw9900" },
 763         {},
 764 };
 765 MODULE_DEVICE_TABLE(of, tw9900_of_match);
 766
 767 static struct i2c_driver tw9900_i2c_driver = {
 768         .driver = {
 769                 .name           = "tw9900",
 770                 .pm             = &tw9900_pm_ops,
 771                 .of_match_table = tw9900_of_match,
 772         },
 773         .probe    = tw9900_probe,
 774         .remove   = tw9900_remove,
 775         .id_table = tw9900_id,
 776 };
 777
 778 module_i2c_driver(tw9900_i2c_driver);
 779
 780 MODULE_DESCRIPTION("tw9900 decoder driver");
 781 MODULE_LICENSE("GPL");