drivers/media/i2c/ov2685.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ov2685 driver
   4  *
   5  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/device.h>
  10 #include <linux/delay.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/i2c.h>
  13 #include <linux/module.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/sysfs.h>
  17 #include <media/media-entity.h>
  18 #include <media/v4l2-async.h>
  19 #include <media/v4l2-ctrls.h>
  20 #include <media/v4l2-subdev.h>
  21
  22 #define CHIP_ID                         0x2685
  23 #define OV2685_REG_CHIP_ID              0x300a
  24
  25 #define OV2685_XVCLK_FREQ               24000000
  26
  27 #define REG_SC_CTRL_MODE                0x0100
  28 #define     SC_CTRL_MODE_STANDBY        0x0
  29 #define     SC_CTRL_MODE_STREAMING      BIT(0)
  30
  31 #define OV2685_REG_EXPOSURE             0x3500
  32 #define OV2685_EXPOSURE_MIN             4
  33 #define OV2685_EXPOSURE_STEP            1
  34
  35 #define OV2685_REG_VTS                  0x380e
  36 #define OV2685_VTS_MAX                  0x7fff
  37
  38 #define OV2685_REG_GAIN                 0x350a
  39 #define OV2685_GAIN_MIN                 0
  40 #define OV2685_GAIN_MAX                 0x07ff
  41 #define OV2685_GAIN_STEP                0x1
  42 #define OV2685_GAIN_DEFAULT             0x0036
  43
  44 #define OV2685_REG_TEST_PATTERN         0x5080
  45 #define OV2685_TEST_PATTERN_DISABLED            0x00
  46 #define OV2685_TEST_PATTERN_COLOR_BAR           0x80
  47 #define OV2685_TEST_PATTERN_RANDOM              0x81
  48 #define OV2685_TEST_PATTERN_COLOR_BAR_FADE      0x88
  49 #define OV2685_TEST_PATTERN_BW_SQUARE           0x92
  50 #define OV2685_TEST_PATTERN_COLOR_SQUARE        0x82
  51
  52 #define REG_NULL                        0xFFFF
  53
  54 #define OV2685_REG_VALUE_08BIT          1
  55 #define OV2685_REG_VALUE_16BIT          2
  56 #define OV2685_REG_VALUE_24BIT          3
  57
  58 #define OV2685_LANES                    1
  59 #define OV2685_BITS_PER_SAMPLE          10
  60
  61 static const char * const ov2685_supply_names[] = {
  62         "avdd",         /* Analog power */
  63         "dovdd",        /* Digital I/O power */
  64         "dvdd",         /* Digital core power */
  65 };
  66
  67 #define OV2685_NUM_SUPPLIES ARRAY_SIZE(ov2685_supply_names)
  68
  69 struct regval {
  70         u16 addr;
  71         u8 val;
  72 };
  73
  74 struct ov2685_mode {
  75         u32 width;
  76         u32 height;
  77         u32 exp_def;
  78         u32 hts_def;
  79         u32 vts_def;
  80         const struct regval *reg_list;
  81 };
  82
  83 struct ov2685 {
  84         struct i2c_client       *client;
  85         struct clk              *xvclk;
  86         struct gpio_desc        *reset_gpio;
  87         struct regulator_bulk_data supplies[OV2685_NUM_SUPPLIES];
  88
  89         bool                    streaming;
  90         struct mutex            mutex;
  91         struct v4l2_subdev      subdev;
  92         struct media_pad        pad;
  93         struct v4l2_ctrl        *anal_gain;
  94         struct v4l2_ctrl        *exposure;
  95         struct v4l2_ctrl        *hblank;
  96         struct v4l2_ctrl        *vblank;
  97         struct v4l2_ctrl        *test_pattern;
  98         struct v4l2_ctrl_handler ctrl_handler;
  99
 100         const struct ov2685_mode *cur_mode;
 101 };
 102
 103 #define to_ov2685(sd) container_of(sd, struct ov2685, subdev)
 104
 105 /* PLL settings bases on 24M xvclk */
 106 static struct regval ov2685_1600x1200_regs[] = {
 107         {0x0103, 0x01},
 108         {0x0100, 0x00},
 109         {0x3002, 0x00},
 110         {0x3016, 0x1c},
 111         {0x3018, 0x44},
 112         {0x301d, 0xf0},
 113         {0x3020, 0x00},
 114         {0x3082, 0x37},
 115         {0x3083, 0x03},
 116         {0x3084, 0x09},
 117         {0x3085, 0x04},
 118         {0x3086, 0x00},
 119         {0x3087, 0x00},
 120         {0x3501, 0x4e},
 121         {0x3502, 0xe0},
 122         {0x3503, 0x27},
 123         {0x350b, 0x36},
 124         {0x3600, 0xb4},
 125         {0x3603, 0x35},
 126         {0x3604, 0x24},
 127         {0x3605, 0x00},
 128         {0x3620, 0x24},
 129         {0x3621, 0x34},
 130         {0x3622, 0x03},
 131         {0x3628, 0x10},
 132         {0x3705, 0x3c},
 133         {0x370a, 0x21},
 134         {0x370c, 0x50},
 135         {0x370d, 0xc0},
 136         {0x3717, 0x58},
 137         {0x3718, 0x80},
 138         {0x3720, 0x00},
 139         {0x3721, 0x09},
 140         {0x3722, 0x06},
 141         {0x3723, 0x59},
 142         {0x3738, 0x99},
 143         {0x3781, 0x80},
 144         {0x3784, 0x0c},
 145         {0x3789, 0x60},
 146         {0x3800, 0x00},
 147         {0x3801, 0x00},
 148         {0x3802, 0x00},
 149         {0x3803, 0x00},
 150         {0x3804, 0x06},
 151         {0x3805, 0x4f},
 152         {0x3806, 0x04},
 153         {0x3807, 0xbf},
 154         {0x3808, 0x06},
 155         {0x3809, 0x40},
 156         {0x380a, 0x04},
 157         {0x380b, 0xb0},
 158         {0x380c, 0x06},
 159         {0x380d, 0xa4},
 160         {0x380e, 0x05},
 161         {0x380f, 0x0e},
 162         {0x3810, 0x00},
 163         {0x3811, 0x08},
 164         {0x3812, 0x00},
 165         {0x3813, 0x08},
 166         {0x3814, 0x11},
 167         {0x3815, 0x11},
 168         {0x3819, 0x04},
 169         {0x3820, 0xc0},
 170         {0x3821, 0x00},
 171         {0x3a06, 0x01},
 172         {0x3a07, 0x84},
 173         {0x3a08, 0x01},
 174         {0x3a09, 0x43},
 175         {0x3a0a, 0x24},
 176         {0x3a0b, 0x60},
 177         {0x3a0c, 0x28},
 178         {0x3a0d, 0x60},
 179         {0x3a0e, 0x04},
 180         {0x3a0f, 0x8c},
 181         {0x3a10, 0x05},
 182         {0x3a11, 0x0c},
 183         {0x4000, 0x81},
 184         {0x4001, 0x40},
 185         {0x4008, 0x02},
 186         {0x4009, 0x09},
 187         {0x4300, 0x00},
 188         {0x430e, 0x00},
 189         {0x4602, 0x02},
 190         {0x481b, 0x40},
 191         {0x481f, 0x40},
 192         {0x4837, 0x18},
 193         {0x5000, 0x1f},
 194         {0x5001, 0x05},
 195         {0x5002, 0x30},
 196         {0x5003, 0x04},
 197         {0x5004, 0x00},
 198         {0x5005, 0x0c},
 199         {0x5280, 0x15},
 200         {0x5281, 0x06},
 201         {0x5282, 0x06},
 202         {0x5283, 0x08},
 203         {0x5284, 0x1c},
 204         {0x5285, 0x1c},
 205         {0x5286, 0x20},
 206         {0x5287, 0x10},
 207         {REG_NULL, 0x00}
 208 };
 209
 210 #define OV2685_LINK_FREQ_330MHZ         330000000
 211 static const s64 link_freq_menu_items[] = {
 212         OV2685_LINK_FREQ_330MHZ
 213 };
 214
 215 static const char * const ov2685_test_pattern_menu[] = {
 216         "Disabled",
 217         "Color Bar",
 218         "Color Bar FADE",
 219         "Random Data",
 220         "Black White Square",
 221         "Color Square"
 222 };
 223
 224 static const int ov2685_test_pattern_val[] = {
 225         OV2685_TEST_PATTERN_DISABLED,
 226         OV2685_TEST_PATTERN_COLOR_BAR,
 227         OV2685_TEST_PATTERN_COLOR_BAR_FADE,
 228         OV2685_TEST_PATTERN_RANDOM,
 229         OV2685_TEST_PATTERN_BW_SQUARE,
 230         OV2685_TEST_PATTERN_COLOR_SQUARE,
 231 };
 232
 233 static const struct ov2685_mode supported_modes[] = {
 234         {
 235                 .width = 1600,
 236                 .height = 1200,
 237                 .exp_def = 0x04ee,
 238                 .hts_def = 0x06a4,
 239                 .vts_def = 0x050e,
 240                 .reg_list = ov2685_1600x1200_regs,
 241         },
 242 };
 243
 244 /* Write registers up to 4 at a time */
 245 static int ov2685_write_reg(struct i2c_client *client, u16 reg,
 246                             u32 len, u32 val)
 247 {
 248         u32 val_i, buf_i;
 249         u8 buf[6];
 250         u8 *val_p;
 251         __be32 val_be;
 252
 253         if (len > 4)
 254                 return -EINVAL;
 255
 256         buf[0] = reg >> 8;
 257         buf[1] = reg & 0xff;
 258
 259         val_be = cpu_to_be32(val);
 260         val_p = (u8 *)&val_be;
 261         buf_i = 2;
 262         val_i = 4 - len;
 263
 264         while (val_i < 4)
 265                 buf[buf_i++] = val_p[val_i++];
 266
 267         if (i2c_master_send(client, buf, len + 2) != len + 2)
 268                 return -EIO;
 269
 270         return 0;
 271 }
 272
 273 static int ov2685_write_array(struct i2c_client *client,
 274                               const struct regval *regs)
 275 {
 276         int ret = 0;
 277         u32 i;
 278
 279         for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
 280                 ret = ov2685_write_reg(client, regs[i].addr,
 281                                        OV2685_REG_VALUE_08BIT, regs[i].val);
 282
 283         return ret;
 284 }
 285
 286 /* Read registers up to 4 at a time */
 287 static int ov2685_read_reg(struct i2c_client *client, u16 reg,
 288                            u32 len, u32 *val)
 289 {
 290         struct i2c_msg msgs[2];
 291         u8 *data_be_p;
 292         __be32 data_be = 0;
 293         __be16 reg_addr_be = cpu_to_be16(reg);
 294         int ret;
 295
 296         if (len > 4)
 297                 return -EINVAL;
 298
 299         data_be_p = (u8 *)&data_be;
 300         /* Write register address */
 301         msgs[0].addr = client->addr;
 302         msgs[0].flags = 0;
 303         msgs[0].len = 2;
 304         msgs[0].buf = (u8 *)&reg_addr_be;
 305
 306         /* Read data from register */
 307         msgs[1].addr = client->addr;
 308         msgs[1].flags = I2C_M_RD;
 309         msgs[1].len = len;
 310         msgs[1].buf = &data_be_p[4 - len];
 311
 312         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 313         if (ret != ARRAY_SIZE(msgs))
 314                 return -EIO;
 315
 316         *val = be32_to_cpu(data_be);
 317
 318         return 0;
 319 }
 320
 321 static void ov2685_fill_fmt(const struct ov2685_mode *mode,
 322                             struct v4l2_mbus_framefmt *fmt)
 323 {
 324         fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 325         fmt->width = mode->width;
 326         fmt->height = mode->height;
 327         fmt->field = V4L2_FIELD_NONE;
 328 }
 329
 330 static int ov2685_set_fmt(struct v4l2_subdev *sd,
 331                           struct v4l2_subdev_state *sd_state,
 332                           struct v4l2_subdev_format *fmt)
 333 {
 334         struct ov2685 *ov2685 = to_ov2685(sd);
 335         struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
 336
 337         /* only one mode supported for now */
 338         ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);
 339
 340         return 0;
 341 }
 342
 343 static int ov2685_get_fmt(struct v4l2_subdev *sd,
 344                           struct v4l2_subdev_state *sd_state,
 345                           struct v4l2_subdev_format *fmt)
 346 {
 347         struct ov2685 *ov2685 = to_ov2685(sd);
 348         struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
 349
 350         ov2685_fill_fmt(ov2685->cur_mode, mbus_fmt);
 351
 352         return 0;
 353 }
 354
 355 static int ov2685_enum_mbus_code(struct v4l2_subdev *sd,
 356                                  struct v4l2_subdev_state *sd_state,
 357                                  struct v4l2_subdev_mbus_code_enum *code)
 358 {
 359         if (code->index >= ARRAY_SIZE(supported_modes))
 360                 return -EINVAL;
 361
 362         code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 363
 364         return 0;
 365 }
 366
 367 static int ov2685_enum_frame_sizes(struct v4l2_subdev *sd,
 368                                    struct v4l2_subdev_state *sd_state,
 369                                    struct v4l2_subdev_frame_size_enum *fse)
 370 {
 371         int index = fse->index;
 372
 373         if (index >= ARRAY_SIZE(supported_modes))
 374                 return -EINVAL;
 375
 376         fse->code = MEDIA_BUS_FMT_SBGGR10_1X10;
 377
 378         fse->min_width  = supported_modes[index].width;
 379         fse->max_width  = supported_modes[index].width;
 380         fse->max_height = supported_modes[index].height;
 381         fse->min_height = supported_modes[index].height;
 382
 383         return 0;
 384 }
 385
 386 /* Calculate the delay in us by clock rate and clock cycles */
 387 static inline u32 ov2685_cal_delay(u32 cycles)
 388 {
 389         return DIV_ROUND_UP(cycles, OV2685_XVCLK_FREQ / 1000 / 1000);
 390 }
 391
 392 static int __ov2685_power_on(struct ov2685 *ov2685)
 393 {
 394         int ret;
 395         u32 delay_us;
 396         struct device *dev = &ov2685->client->dev;
 397
 398         ret = clk_prepare_enable(ov2685->xvclk);
 399         if (ret < 0) {
 400                 dev_err(dev, "Failed to enable xvclk\n");
 401                 return ret;
 402         }
 403
 404         gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
 405
 406         ret = regulator_bulk_enable(OV2685_NUM_SUPPLIES, ov2685->supplies);
 407         if (ret < 0) {
 408                 dev_err(dev, "Failed to enable regulators\n");
 409                 goto disable_clk;
 410         }
 411
 412         /* The minimum delay between power supplies and reset rising can be 0 */
 413         gpiod_set_value_cansleep(ov2685->reset_gpio, 0);
 414         /* 8192 xvclk cycles prior to the first SCCB transaction */
 415         delay_us = ov2685_cal_delay(8192);
 416         usleep_range(delay_us, delay_us * 2);
 417
 418         /* HACK: ov2685 would output messy data after reset(R0103),
 419          * writing register before .s_stream() as a workaround
 420          */
 421         ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
 422         if (ret)
 423                 goto disable_supplies;
 424
 425         return 0;
 426
 427 disable_supplies:
 428         regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
 429 disable_clk:
 430         clk_disable_unprepare(ov2685->xvclk);
 431
 432         return ret;
 433 }
 434
 435 static void __ov2685_power_off(struct ov2685 *ov2685)
 436 {
 437         /* 512 xvclk cycles after the last SCCB transaction or MIPI frame end */
 438         u32 delay_us = ov2685_cal_delay(512);
 439
 440         usleep_range(delay_us, delay_us * 2);
 441         clk_disable_unprepare(ov2685->xvclk);
 442         gpiod_set_value_cansleep(ov2685->reset_gpio, 1);
 443         regulator_bulk_disable(OV2685_NUM_SUPPLIES, ov2685->supplies);
 444 }
 445
 446 static int ov2685_s_stream(struct v4l2_subdev *sd, int on)
 447 {
 448         struct ov2685 *ov2685 = to_ov2685(sd);
 449         struct i2c_client *client = ov2685->client;
 450         int ret = 0;
 451
 452         mutex_lock(&ov2685->mutex);
 453
 454         on = !!on;
 455         if (on == ov2685->streaming)
 456                 goto unlock_and_return;
 457
 458         if (on) {
 459                 ret = pm_runtime_resume_and_get(&ov2685->client->dev);
 460                 if (ret < 0)
 461                         goto unlock_and_return;
 462
 463                 ret = __v4l2_ctrl_handler_setup(&ov2685->ctrl_handler);
 464                 if (ret) {
 465                         pm_runtime_put(&client->dev);
 466                         goto unlock_and_return;
 467                 }
 468                 ret = ov2685_write_reg(client, REG_SC_CTRL_MODE,
 469                                 OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STREAMING);
 470                 if (ret) {
 471                         pm_runtime_put(&client->dev);
 472                         goto unlock_and_return;
 473                 }
 474         } else {
 475                 ov2685_write_reg(client, REG_SC_CTRL_MODE,
 476                                 OV2685_REG_VALUE_08BIT, SC_CTRL_MODE_STANDBY);
 477                 pm_runtime_put(&ov2685->client->dev);
 478         }
 479
 480         ov2685->streaming = on;
 481
 482 unlock_and_return:
 483         mutex_unlock(&ov2685->mutex);
 484
 485         return ret;
 486 }
 487
 488 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 489 static int ov2685_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 490 {
 491         struct ov2685 *ov2685 = to_ov2685(sd);
 492         struct v4l2_mbus_framefmt *try_fmt;
 493
 494         mutex_lock(&ov2685->mutex);
 495
 496         try_fmt = v4l2_subdev_get_try_format(sd, fh->state, 0);
 497         /* Initialize try_fmt */
 498         ov2685_fill_fmt(&supported_modes[0], try_fmt);
 499
 500         mutex_unlock(&ov2685->mutex);
 501
 502         return 0;
 503 }
 504 #endif
 505
 506 static int __maybe_unused ov2685_runtime_resume(struct device *dev)
 507 {
 508         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 509         struct ov2685 *ov2685 = to_ov2685(sd);
 510
 511         return __ov2685_power_on(ov2685);
 512 }
 513
 514 static int __maybe_unused ov2685_runtime_suspend(struct device *dev)
 515 {
 516         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 517         struct ov2685 *ov2685 = to_ov2685(sd);
 518
 519         __ov2685_power_off(ov2685);
 520
 521         return 0;
 522 }
 523
 524 static const struct dev_pm_ops ov2685_pm_ops = {
 525         SET_RUNTIME_PM_OPS(ov2685_runtime_suspend,
 526                            ov2685_runtime_resume, NULL)
 527 };
 528
 529 static int ov2685_set_ctrl(struct v4l2_ctrl *ctrl)
 530 {
 531         struct ov2685 *ov2685 = container_of(ctrl->handler,
 532                                              struct ov2685, ctrl_handler);
 533         struct i2c_client *client = ov2685->client;
 534         s64 max_expo;
 535         int ret;
 536
 537         /* Propagate change of current control to all related controls */
 538         switch (ctrl->id) {
 539         case V4L2_CID_VBLANK:
 540                 /* Update max exposure while meeting expected vblanking */
 541                 max_expo = ov2685->cur_mode->height + ctrl->val - 4;
 542                 __v4l2_ctrl_modify_range(ov2685->exposure,
 543                                          ov2685->exposure->minimum, max_expo,
 544                                          ov2685->exposure->step,
 545                                          ov2685->exposure->default_value);
 546                 break;
 547         }
 548
 549         if (!pm_runtime_get_if_in_use(&client->dev))
 550                 return 0;
 551
 552         switch (ctrl->id) {
 553         case V4L2_CID_EXPOSURE:
 554                 ret = ov2685_write_reg(ov2685->client, OV2685_REG_EXPOSURE,
 555                                        OV2685_REG_VALUE_24BIT, ctrl->val << 4);
 556                 break;
 557         case V4L2_CID_ANALOGUE_GAIN:
 558                 ret = ov2685_write_reg(ov2685->client, OV2685_REG_GAIN,
 559                                        OV2685_REG_VALUE_16BIT, ctrl->val);
 560                 break;
 561         case V4L2_CID_VBLANK:
 562                 ret = ov2685_write_reg(ov2685->client, OV2685_REG_VTS,
 563                                        OV2685_REG_VALUE_16BIT,
 564                                        ctrl->val + ov2685->cur_mode->height);
 565                 break;
 566         case V4L2_CID_TEST_PATTERN:
 567                 ret = ov2685_write_reg(ov2685->client, OV2685_REG_TEST_PATTERN,
 568                                        OV2685_REG_VALUE_08BIT,
 569                                        ov2685_test_pattern_val[ctrl->val]);
 570                 break;
 571         default:
 572                 dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
 573                          __func__, ctrl->id, ctrl->val);
 574                 ret = -EINVAL;
 575                 break;
 576         }
 577
 578         pm_runtime_put(&client->dev);
 579
 580         return ret;
 581 }
 582
 583 static const struct v4l2_subdev_video_ops ov2685_video_ops = {
 584         .s_stream = ov2685_s_stream,
 585 };
 586
 587 static const struct v4l2_subdev_pad_ops ov2685_pad_ops = {
 588         .enum_mbus_code = ov2685_enum_mbus_code,
 589         .enum_frame_size = ov2685_enum_frame_sizes,
 590         .get_fmt = ov2685_get_fmt,
 591         .set_fmt = ov2685_set_fmt,
 592 };
 593
 594 static const struct v4l2_subdev_ops ov2685_subdev_ops = {
 595         .video  = &ov2685_video_ops,
 596         .pad    = &ov2685_pad_ops,
 597 };
 598
 599 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 600 static const struct v4l2_subdev_internal_ops ov2685_internal_ops = {
 601         .open = ov2685_open,
 602 };
 603 #endif
 604
 605 static const struct v4l2_ctrl_ops ov2685_ctrl_ops = {
 606         .s_ctrl = ov2685_set_ctrl,
 607 };
 608
 609 static int ov2685_initialize_controls(struct ov2685 *ov2685)
 610 {
 611         const struct ov2685_mode *mode;
 612         struct v4l2_ctrl_handler *handler;
 613         struct v4l2_ctrl *ctrl;
 614         u64 exposure_max;
 615         u32 pixel_rate, h_blank;
 616         int ret;
 617
 618         handler = &ov2685->ctrl_handler;
 619         mode = ov2685->cur_mode;
 620         ret = v4l2_ctrl_handler_init(handler, 8);
 621         if (ret)
 622                 return ret;
 623         handler->lock = &ov2685->mutex;
 624
 625         ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
 626                                       0, 0, link_freq_menu_items);
 627         if (ctrl)
 628                 ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 629
 630         pixel_rate = (link_freq_menu_items[0] * 2 * OV2685_LANES) /
 631                      OV2685_BITS_PER_SAMPLE;
 632         v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
 633                           0, pixel_rate, 1, pixel_rate);
 634
 635         h_blank = mode->hts_def - mode->width;
 636         ov2685->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
 637                                 h_blank, h_blank, 1, h_blank);
 638         if (ov2685->hblank)
 639                 ov2685->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 640
 641         ov2685->vblank = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
 642                                 V4L2_CID_VBLANK, mode->vts_def - mode->height,
 643                                 OV2685_VTS_MAX - mode->height, 1,
 644                                 mode->vts_def - mode->height);
 645
 646         exposure_max = mode->vts_def - 4;
 647         ov2685->exposure = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
 648                                 V4L2_CID_EXPOSURE, OV2685_EXPOSURE_MIN,
 649                                 exposure_max, OV2685_EXPOSURE_STEP,
 650                                 mode->exp_def);
 651
 652         ov2685->anal_gain = v4l2_ctrl_new_std(handler, &ov2685_ctrl_ops,
 653                                 V4L2_CID_ANALOGUE_GAIN, OV2685_GAIN_MIN,
 654                                 OV2685_GAIN_MAX, OV2685_GAIN_STEP,
 655                                 OV2685_GAIN_DEFAULT);
 656
 657         ov2685->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
 658                                 &ov2685_ctrl_ops, V4L2_CID_TEST_PATTERN,
 659                                 ARRAY_SIZE(ov2685_test_pattern_menu) - 1,
 660                                 0, 0, ov2685_test_pattern_menu);
 661
 662         if (handler->error) {
 663                 ret = handler->error;
 664                 dev_err(&ov2685->client->dev,
 665                         "Failed to init controls(%d)\n", ret);
 666                 goto err_free_handler;
 667         }
 668
 669         ov2685->subdev.ctrl_handler = handler;
 670
 671         return 0;
 672
 673 err_free_handler:
 674         v4l2_ctrl_handler_free(handler);
 675
 676         return ret;
 677 }
 678
 679 static int ov2685_check_sensor_id(struct ov2685 *ov2685,
 680                                   struct i2c_client *client)
 681 {
 682         struct device *dev = &ov2685->client->dev;
 683         int ret;
 684         u32 id = 0;
 685
 686         ret = ov2685_read_reg(client, OV2685_REG_CHIP_ID,
 687                               OV2685_REG_VALUE_16BIT, &id);
 688         if (id != CHIP_ID) {
 689                 dev_err(dev, "Unexpected sensor id(%04x), ret(%d)\n", id, ret);
 690                 return ret;
 691         }
 692
 693         dev_info(dev, "Detected OV%04x sensor\n", CHIP_ID);
 694
 695         return 0;
 696 }
 697
 698 static int ov2685_configure_regulators(struct ov2685 *ov2685)
 699 {
 700         int i;
 701
 702         for (i = 0; i < OV2685_NUM_SUPPLIES; i++)
 703                 ov2685->supplies[i].supply = ov2685_supply_names[i];
 704
 705         return devm_regulator_bulk_get(&ov2685->client->dev,
 706                                        OV2685_NUM_SUPPLIES,
 707                                        ov2685->supplies);
 708 }
 709
 710 static int ov2685_probe(struct i2c_client *client,
 711                         const struct i2c_device_id *id)
 712 {
 713         struct device *dev = &client->dev;
 714         struct ov2685 *ov2685;
 715         int ret;
 716
 717         ov2685 = devm_kzalloc(dev, sizeof(*ov2685), GFP_KERNEL);
 718         if (!ov2685)
 719                 return -ENOMEM;
 720
 721         ov2685->client = client;
 722         ov2685->cur_mode = &supported_modes[0];
 723
 724         ov2685->xvclk = devm_clk_get(dev, "xvclk");
 725         if (IS_ERR(ov2685->xvclk)) {
 726                 dev_err(dev, "Failed to get xvclk\n");
 727                 return -EINVAL;
 728         }
 729         ret = clk_set_rate(ov2685->xvclk, OV2685_XVCLK_FREQ);
 730         if (ret < 0) {
 731                 dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
 732                 return ret;
 733         }
 734         if (clk_get_rate(ov2685->xvclk) != OV2685_XVCLK_FREQ)
 735                 dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");
 736
 737         ov2685->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
 738         if (IS_ERR(ov2685->reset_gpio)) {
 739                 dev_err(dev, "Failed to get reset-gpios\n");
 740                 return -EINVAL;
 741         }
 742
 743         ret = ov2685_configure_regulators(ov2685);
 744         if (ret) {
 745                 dev_err(dev, "Failed to get power regulators\n");
 746                 return ret;
 747         }
 748
 749         mutex_init(&ov2685->mutex);
 750         v4l2_i2c_subdev_init(&ov2685->subdev, client, &ov2685_subdev_ops);
 751         ret = ov2685_initialize_controls(ov2685);
 752         if (ret)
 753                 goto err_destroy_mutex;
 754
 755         ret = __ov2685_power_on(ov2685);
 756         if (ret)
 757                 goto err_free_handler;
 758
 759         ret = ov2685_check_sensor_id(ov2685, client);
 760         if (ret)
 761                 goto err_power_off;
 762
 763 #ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
 764         ov2685->subdev.internal_ops = &ov2685_internal_ops;
 765         ov2685->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 766 #endif
 767 #if defined(CONFIG_MEDIA_CONTROLLER)
 768         ov2685->pad.flags = MEDIA_PAD_FL_SOURCE;
 769         ov2685->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 770         ret = media_entity_pads_init(&ov2685->subdev.entity, 1, &ov2685->pad);
 771         if (ret < 0)
 772                 goto err_power_off;
 773 #endif
 774
 775         ret = v4l2_async_register_subdev(&ov2685->subdev);
 776         if (ret) {
 777                 dev_err(dev, "v4l2 async register subdev failed\n");
 778                 goto err_clean_entity;
 779         }
 780
 781         pm_runtime_set_active(dev);
 782         pm_runtime_enable(dev);
 783         pm_runtime_idle(dev);
 784
 785         return 0;
 786
 787 err_clean_entity:
 788 #if defined(CONFIG_MEDIA_CONTROLLER)
 789         media_entity_cleanup(&ov2685->subdev.entity);
 790 #endif
 791 err_power_off:
 792         __ov2685_power_off(ov2685);
 793 err_free_handler:
 794         v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
 795 err_destroy_mutex:
 796         mutex_destroy(&ov2685->mutex);
 797
 798         return ret;
 799 }
 800
 801 static int ov2685_remove(struct i2c_client *client)
 802 {
 803         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 804         struct ov2685 *ov2685 = to_ov2685(sd);
 805
 806         v4l2_async_unregister_subdev(sd);
 807 #if defined(CONFIG_MEDIA_CONTROLLER)
 808         media_entity_cleanup(&sd->entity);
 809 #endif
 810         v4l2_ctrl_handler_free(&ov2685->ctrl_handler);
 811         mutex_destroy(&ov2685->mutex);
 812
 813         pm_runtime_disable(&client->dev);
 814         if (!pm_runtime_status_suspended(&client->dev))
 815                 __ov2685_power_off(ov2685);
 816         pm_runtime_set_suspended(&client->dev);
 817
 818         return 0;
 819 }
 820
 821 #if IS_ENABLED(CONFIG_OF)
 822 static const struct of_device_id ov2685_of_match[] = {
 823         { .compatible = "ovti,ov2685" },
 824         {},
 825 };
 826 MODULE_DEVICE_TABLE(of, ov2685_of_match);
 827 #endif
 828
 829 static struct i2c_driver ov2685_i2c_driver = {
 830         .driver = {
 831                 .name = "ov2685",
 832                 .pm = &ov2685_pm_ops,
 833                 .of_match_table = of_match_ptr(ov2685_of_match),
 834         },
 835         .probe          = &ov2685_probe,
 836         .remove         = &ov2685_remove,
 837 };
 838
 839 module_i2c_driver(ov2685_i2c_driver);
 840
 841 MODULE_DESCRIPTION("OmniVision ov2685 sensor driver");
 842 MODULE_LICENSE("GPL v2");