drivers/media/i2c/ov2680.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Omnivision OV2680 CMOS Image Sensor driver
   4  *
   5  * Copyright (C) 2018 Linaro Ltd
   6  *
   7  * Based on OV5640 Sensor Driver
   8  * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
   9  * Copyright (C) 2014-2017 Mentor Graphics Inc.
  10  *
  11  */
  12
  13 #include <asm/unaligned.h>
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/of_device.h>
  21 #include <linux/gpio/consumer.h>
  22 #include <linux/regulator/consumer.h>
  23
  24 #include <media/v4l2-common.h>
  25 #include <media/v4l2-ctrls.h>
  26 #include <media/v4l2-subdev.h>
  27
  28 #define OV2680_XVCLK_VALUE      24000000
  29
  30 #define OV2680_CHIP_ID          0x2680
  31
  32 #define OV2680_REG_STREAM_CTRL          0x0100
  33 #define OV2680_REG_SOFT_RESET           0x0103
  34
  35 #define OV2680_REG_CHIP_ID_HIGH         0x300a
  36 #define OV2680_REG_CHIP_ID_LOW          0x300b
  37
  38 #define OV2680_REG_R_MANUAL             0x3503
  39 #define OV2680_REG_GAIN_PK              0x350a
  40 #define OV2680_REG_EXPOSURE_PK_HIGH     0x3500
  41 #define OV2680_REG_TIMING_HTS           0x380c
  42 #define OV2680_REG_TIMING_VTS           0x380e
  43 #define OV2680_REG_FORMAT1              0x3820
  44 #define OV2680_REG_FORMAT2              0x3821
  45
  46 #define OV2680_REG_ISP_CTRL00           0x5080
  47
  48 #define OV2680_FRAME_RATE               30
  49
  50 #define OV2680_REG_VALUE_8BIT           1
  51 #define OV2680_REG_VALUE_16BIT          2
  52 #define OV2680_REG_VALUE_24BIT          3
  53
  54 #define OV2680_WIDTH_MAX                1600
  55 #define OV2680_HEIGHT_MAX               1200
  56
  57 #define OV2680_DEFAULT_WIDTH                    800
  58 #define OV2680_DEFAULT_HEIGHT                   600
  59
  60 enum ov2680_mode_id {
  61         OV2680_MODE_QUXGA_800_600,
  62         OV2680_MODE_720P_1280_720,
  63         OV2680_MODE_UXGA_1600_1200,
  64         OV2680_MODE_MAX,
  65 };
  66
  67 struct reg_value {
  68         u16 reg_addr;
  69         u8 val;
  70 };
  71
  72 static const char * const ov2680_supply_name[] = {
  73         "DOVDD",
  74         "DVDD",
  75         "AVDD",
  76 };
  77
  78 #define OV2680_NUM_SUPPLIES ARRAY_SIZE(ov2680_supply_name)
  79
  80 struct ov2680_mode_info {
  81         const char *name;
  82         enum ov2680_mode_id id;
  83         u32 width;
  84         u32 height;
  85         const struct reg_value *reg_data;
  86         u32 reg_data_size;
  87 };
  88
  89 struct ov2680_ctrls {
  90         struct v4l2_ctrl_handler handler;
  91         struct v4l2_ctrl *exposure;
  92         struct v4l2_ctrl *gain;
  93         struct v4l2_ctrl *hflip;
  94         struct v4l2_ctrl *vflip;
  95         struct v4l2_ctrl *test_pattern;
  96 };
  97
  98 struct ov2680_dev {
  99         struct i2c_client               *i2c_client;
 100         struct v4l2_subdev              sd;
 101
 102         struct media_pad                pad;
 103         struct clk                      *xvclk;
 104         u32                             xvclk_freq;
 105         struct regulator_bulk_data      supplies[OV2680_NUM_SUPPLIES];
 106
 107         struct gpio_desc                *reset_gpio;
 108         struct mutex                    lock; /* protect members */
 109
 110         bool                            mode_pending_changes;
 111         bool                            is_enabled;
 112         bool                            is_streaming;
 113
 114         struct ov2680_ctrls             ctrls;
 115         struct v4l2_mbus_framefmt       fmt;
 116         struct v4l2_fract               frame_interval;
 117
 118         const struct ov2680_mode_info   *current_mode;
 119 };
 120
 121 static const char * const test_pattern_menu[] = {
 122         "Disabled",
 123         "Color Bars",
 124         "Random Data",
 125         "Square",
 126         "Black Image",
 127 };
 128
 129 static const int ov2680_hv_flip_bayer_order[] = {
 130         MEDIA_BUS_FMT_SBGGR10_1X10,
 131         MEDIA_BUS_FMT_SGRBG10_1X10,
 132         MEDIA_BUS_FMT_SGBRG10_1X10,
 133         MEDIA_BUS_FMT_SRGGB10_1X10,
 134 };
 135
 136 static const struct reg_value ov2680_setting_30fps_QUXGA_800_600[] = {
 137         {0x3086, 0x01}, {0x370a, 0x23}, {0x3808, 0x03}, {0x3809, 0x20},
 138         {0x380a, 0x02}, {0x380b, 0x58}, {0x380c, 0x06}, {0x380d, 0xac},
 139         {0x380e, 0x02}, {0x380f, 0x84}, {0x3811, 0x04}, {0x3813, 0x04},
 140         {0x3814, 0x31}, {0x3815, 0x31}, {0x3820, 0xc0}, {0x4008, 0x00},
 141         {0x4009, 0x03}, {0x4837, 0x1e}, {0x3501, 0x4e}, {0x3502, 0xe0},
 142         {0x3503, 0x03},
 143 };
 144
 145 static const struct reg_value ov2680_setting_30fps_720P_1280_720[] = {
 146         {0x3086, 0x00}, {0x3808, 0x05}, {0x3809, 0x00}, {0x380a, 0x02},
 147         {0x380b, 0xd0}, {0x380c, 0x06}, {0x380d, 0xa8}, {0x380e, 0x05},
 148         {0x380f, 0x0e}, {0x3811, 0x08}, {0x3813, 0x06}, {0x3814, 0x11},
 149         {0x3815, 0x11}, {0x3820, 0xc0}, {0x4008, 0x00},
 150 };
 151
 152 static const struct reg_value ov2680_setting_30fps_UXGA_1600_1200[] = {
 153         {0x3086, 0x00}, {0x3501, 0x4e}, {0x3502, 0xe0}, {0x3808, 0x06},
 154         {0x3809, 0x40}, {0x380a, 0x04}, {0x380b, 0xb0}, {0x380c, 0x06},
 155         {0x380d, 0xa8}, {0x380e, 0x05}, {0x380f, 0x0e}, {0x3811, 0x00},
 156         {0x3813, 0x00}, {0x3814, 0x11}, {0x3815, 0x11}, {0x3820, 0xc0},
 157         {0x4008, 0x00}, {0x4837, 0x18}
 158 };
 159
 160 static const struct ov2680_mode_info ov2680_mode_init_data = {
 161         "mode_quxga_800_600", OV2680_MODE_QUXGA_800_600, 800, 600,
 162         ov2680_setting_30fps_QUXGA_800_600,
 163         ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600),
 164 };
 165
 166 static const struct ov2680_mode_info ov2680_mode_data[OV2680_MODE_MAX] = {
 167         {"mode_quxga_800_600", OV2680_MODE_QUXGA_800_600,
 168          800, 600, ov2680_setting_30fps_QUXGA_800_600,
 169          ARRAY_SIZE(ov2680_setting_30fps_QUXGA_800_600)},
 170         {"mode_720p_1280_720", OV2680_MODE_720P_1280_720,
 171          1280, 720, ov2680_setting_30fps_720P_1280_720,
 172          ARRAY_SIZE(ov2680_setting_30fps_720P_1280_720)},
 173         {"mode_uxga_1600_1200", OV2680_MODE_UXGA_1600_1200,
 174          1600, 1200, ov2680_setting_30fps_UXGA_1600_1200,
 175          ARRAY_SIZE(ov2680_setting_30fps_UXGA_1600_1200)},
 176 };
 177
 178 static struct ov2680_dev *to_ov2680_dev(struct v4l2_subdev *sd)
 179 {
 180         return container_of(sd, struct ov2680_dev, sd);
 181 }
 182
 183 static struct device *ov2680_to_dev(struct ov2680_dev *sensor)
 184 {
 185         return &sensor->i2c_client->dev;
 186 }
 187
 188 static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
 189 {
 190         return &container_of(ctrl->handler, struct ov2680_dev,
 191                              ctrls.handler)->sd;
 192 }
 193
 194 static int __ov2680_write_reg(struct ov2680_dev *sensor, u16 reg,
 195                               unsigned int len, u32 val)
 196 {
 197         struct i2c_client *client = sensor->i2c_client;
 198         u8 buf[6];
 199         int ret;
 200
 201         if (len > 4)
 202                 return -EINVAL;
 203
 204         put_unaligned_be16(reg, buf);
 205         put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
 206         ret = i2c_master_send(client, buf, len + 2);
 207         if (ret != len + 2) {
 208                 dev_err(&client->dev, "write error: reg=0x%4x: %d\n", reg, ret);
 209                 return -EIO;
 210         }
 211
 212         return 0;
 213 }
 214
 215 #define ov2680_write_reg(s, r, v) \
 216         __ov2680_write_reg(s, r, OV2680_REG_VALUE_8BIT, v)
 217
 218 #define ov2680_write_reg16(s, r, v) \
 219         __ov2680_write_reg(s, r, OV2680_REG_VALUE_16BIT, v)
 220
 221 #define ov2680_write_reg24(s, r, v) \
 222         __ov2680_write_reg(s, r, OV2680_REG_VALUE_24BIT, v)
 223
 224 static int __ov2680_read_reg(struct ov2680_dev *sensor, u16 reg,
 225                              unsigned int len, u32 *val)
 226 {
 227         struct i2c_client *client = sensor->i2c_client;
 228         struct i2c_msg msgs[2];
 229         u8 addr_buf[2] = { reg >> 8, reg & 0xff };
 230         u8 data_buf[4] = { 0, };
 231         int ret;
 232
 233         if (len > 4)
 234                 return -EINVAL;
 235
 236         msgs[0].addr = client->addr;
 237         msgs[0].flags = 0;
 238         msgs[0].len = ARRAY_SIZE(addr_buf);
 239         msgs[0].buf = addr_buf;
 240
 241         msgs[1].addr = client->addr;
 242         msgs[1].flags = I2C_M_RD;
 243         msgs[1].len = len;
 244         msgs[1].buf = &data_buf[4 - len];
 245
 246         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 247         if (ret != ARRAY_SIZE(msgs)) {
 248                 dev_err(&client->dev, "read error: reg=0x%4x: %d\n", reg, ret);
 249                 return -EIO;
 250         }
 251
 252         *val = get_unaligned_be32(data_buf);
 253
 254         return 0;
 255 }
 256
 257 #define ov2680_read_reg(s, r, v) \
 258         __ov2680_read_reg(s, r, OV2680_REG_VALUE_8BIT, v)
 259
 260 #define ov2680_read_reg16(s, r, v) \
 261         __ov2680_read_reg(s, r, OV2680_REG_VALUE_16BIT, v)
 262
 263 #define ov2680_read_reg24(s, r, v) \
 264         __ov2680_read_reg(s, r, OV2680_REG_VALUE_24BIT, v)
 265
 266 static int ov2680_mod_reg(struct ov2680_dev *sensor, u16 reg, u8 mask, u8 val)
 267 {
 268         u32 readval;
 269         int ret;
 270
 271         ret = ov2680_read_reg(sensor, reg, &readval);
 272         if (ret < 0)
 273                 return ret;
 274
 275         readval &= ~mask;
 276         val &= mask;
 277         val |= readval;
 278
 279         return ov2680_write_reg(sensor, reg, val);
 280 }
 281
 282 static int ov2680_load_regs(struct ov2680_dev *sensor,
 283                             const struct ov2680_mode_info *mode)
 284 {
 285         const struct reg_value *regs = mode->reg_data;
 286         unsigned int i;
 287         int ret = 0;
 288         u16 reg_addr;
 289         u8 val;
 290
 291         for (i = 0; i < mode->reg_data_size; ++i, ++regs) {
 292                 reg_addr = regs->reg_addr;
 293                 val = regs->val;
 294
 295                 ret = ov2680_write_reg(sensor, reg_addr, val);
 296                 if (ret)
 297                         break;
 298         }
 299
 300         return ret;
 301 }
 302
 303 static void ov2680_power_up(struct ov2680_dev *sensor)
 304 {
 305         if (!sensor->reset_gpio)
 306                 return;
 307
 308         gpiod_set_value(sensor->reset_gpio, 0);
 309         usleep_range(5000, 10000);
 310 }
 311
 312 static void ov2680_power_down(struct ov2680_dev *sensor)
 313 {
 314         if (!sensor->reset_gpio)
 315                 return;
 316
 317         gpiod_set_value(sensor->reset_gpio, 1);
 318         usleep_range(5000, 10000);
 319 }
 320
 321 static void ov2680_set_bayer_order(struct ov2680_dev *sensor,
 322                                    struct v4l2_mbus_framefmt *fmt)
 323 {
 324         int hv_flip = 0;
 325
 326         if (sensor->ctrls.vflip && sensor->ctrls.vflip->val)
 327                 hv_flip += 1;
 328
 329         if (sensor->ctrls.hflip && sensor->ctrls.hflip->val)
 330                 hv_flip += 2;
 331
 332         fmt->code = ov2680_hv_flip_bayer_order[hv_flip];
 333 }
 334
 335 static void ov2680_fill_format(struct ov2680_dev *sensor,
 336                                struct v4l2_mbus_framefmt *fmt,
 337                                unsigned int width, unsigned int height)
 338 {
 339         memset(fmt, 0, sizeof(*fmt));
 340         fmt->width = width;
 341         fmt->height = height;
 342         fmt->field = V4L2_FIELD_NONE;
 343         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 344         ov2680_set_bayer_order(sensor, fmt);
 345 }
 346
 347 static int ov2680_set_vflip(struct ov2680_dev *sensor, s32 val)
 348 {
 349         int ret;
 350
 351         if (sensor->is_streaming)
 352                 return -EBUSY;
 353
 354         ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT1,
 355                              BIT(2), val ? BIT(2) : 0);
 356         if (ret < 0)
 357                 return ret;
 358
 359         ov2680_set_bayer_order(sensor, &sensor->fmt);
 360         return 0;
 361 }
 362
 363 static int ov2680_set_hflip(struct ov2680_dev *sensor, s32 val)
 364 {
 365         int ret;
 366
 367         if (sensor->is_streaming)
 368                 return -EBUSY;
 369
 370         ret = ov2680_mod_reg(sensor, OV2680_REG_FORMAT2,
 371                              BIT(2), val ? BIT(2) : 0);
 372         if (ret < 0)
 373                 return ret;
 374
 375         ov2680_set_bayer_order(sensor, &sensor->fmt);
 376         return 0;
 377 }
 378
 379 static int ov2680_test_pattern_set(struct ov2680_dev *sensor, int value)
 380 {
 381         int ret;
 382
 383         if (!value)
 384                 return ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), 0);
 385
 386         ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, 0x03, value - 1);
 387         if (ret < 0)
 388                 return ret;
 389
 390         ret = ov2680_mod_reg(sensor, OV2680_REG_ISP_CTRL00, BIT(7), BIT(7));
 391         if (ret < 0)
 392                 return ret;
 393
 394         return 0;
 395 }
 396
 397 static int ov2680_gain_set(struct ov2680_dev *sensor, u32 gain)
 398 {
 399         return ov2680_write_reg16(sensor, OV2680_REG_GAIN_PK, gain);
 400 }
 401
 402 static int ov2680_exposure_set(struct ov2680_dev *sensor, u32 exp)
 403 {
 404         return ov2680_write_reg24(sensor, OV2680_REG_EXPOSURE_PK_HIGH,
 405                                   exp << 4);
 406 }
 407
 408 static int ov2680_stream_enable(struct ov2680_dev *sensor)
 409 {
 410         return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 1);
 411 }
 412
 413 static int ov2680_stream_disable(struct ov2680_dev *sensor)
 414 {
 415         return ov2680_write_reg(sensor, OV2680_REG_STREAM_CTRL, 0);
 416 }
 417
 418 static int ov2680_mode_set(struct ov2680_dev *sensor)
 419 {
 420         int ret;
 421
 422         ret = ov2680_load_regs(sensor, sensor->current_mode);
 423         if (ret < 0)
 424                 return ret;
 425
 426         /* Restore value of all ctrls */
 427         ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
 428         if (ret < 0)
 429                 return ret;
 430
 431         sensor->mode_pending_changes = false;
 432
 433         return 0;
 434 }
 435
 436 static int ov2680_mode_restore(struct ov2680_dev *sensor)
 437 {
 438         int ret;
 439
 440         ret = ov2680_load_regs(sensor, &ov2680_mode_init_data);
 441         if (ret < 0)
 442                 return ret;
 443
 444         return ov2680_mode_set(sensor);
 445 }
 446
 447 static int ov2680_power_off(struct ov2680_dev *sensor)
 448 {
 449         if (!sensor->is_enabled)
 450                 return 0;
 451
 452         clk_disable_unprepare(sensor->xvclk);
 453         ov2680_power_down(sensor);
 454         regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
 455         sensor->is_enabled = false;
 456
 457         return 0;
 458 }
 459
 460 static int ov2680_power_on(struct ov2680_dev *sensor)
 461 {
 462         struct device *dev = ov2680_to_dev(sensor);
 463         int ret;
 464
 465         if (sensor->is_enabled)
 466                 return 0;
 467
 468         ret = regulator_bulk_enable(OV2680_NUM_SUPPLIES, sensor->supplies);
 469         if (ret < 0) {
 470                 dev_err(dev, "failed to enable regulators: %d\n", ret);
 471                 return ret;
 472         }
 473
 474         if (!sensor->reset_gpio) {
 475                 ret = ov2680_write_reg(sensor, OV2680_REG_SOFT_RESET, 0x01);
 476                 if (ret != 0) {
 477                         dev_err(dev, "sensor soft reset failed\n");
 478                         goto err_disable_regulators;
 479                 }
 480                 usleep_range(1000, 2000);
 481         } else {
 482                 ov2680_power_down(sensor);
 483                 ov2680_power_up(sensor);
 484         }
 485
 486         ret = clk_prepare_enable(sensor->xvclk);
 487         if (ret < 0)
 488                 goto err_disable_regulators;
 489
 490         sensor->is_enabled = true;
 491
 492         /* Set clock lane into LP-11 state */
 493         ov2680_stream_enable(sensor);
 494         usleep_range(1000, 2000);
 495         ov2680_stream_disable(sensor);
 496
 497         return 0;
 498
 499 err_disable_regulators:
 500         regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
 501         return ret;
 502 }
 503
 504 static int ov2680_s_power(struct v4l2_subdev *sd, int on)
 505 {
 506         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 507         int ret = 0;
 508
 509         mutex_lock(&sensor->lock);
 510
 511         if (on)
 512                 ret = ov2680_power_on(sensor);
 513         else
 514                 ret = ov2680_power_off(sensor);
 515
 516         if (on && ret == 0)
 517                 ret = ov2680_mode_restore(sensor);
 518
 519         mutex_unlock(&sensor->lock);
 520
 521         return ret;
 522 }
 523
 524 static int ov2680_s_g_frame_interval(struct v4l2_subdev *sd,
 525                                      struct v4l2_subdev_frame_interval *fi)
 526 {
 527         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 528
 529         mutex_lock(&sensor->lock);
 530         fi->interval = sensor->frame_interval;
 531         mutex_unlock(&sensor->lock);
 532
 533         return 0;
 534 }
 535
 536 static int ov2680_s_stream(struct v4l2_subdev *sd, int enable)
 537 {
 538         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 539         int ret = 0;
 540
 541         mutex_lock(&sensor->lock);
 542
 543         if (sensor->is_streaming == !!enable)
 544                 goto unlock;
 545
 546         if (enable && sensor->mode_pending_changes) {
 547                 ret = ov2680_mode_set(sensor);
 548                 if (ret < 0)
 549                         goto unlock;
 550         }
 551
 552         if (enable)
 553                 ret = ov2680_stream_enable(sensor);
 554         else
 555                 ret = ov2680_stream_disable(sensor);
 556
 557         sensor->is_streaming = !!enable;
 558
 559 unlock:
 560         mutex_unlock(&sensor->lock);
 561
 562         return ret;
 563 }
 564
 565 static int ov2680_enum_mbus_code(struct v4l2_subdev *sd,
 566                                  struct v4l2_subdev_state *sd_state,
 567                                  struct v4l2_subdev_mbus_code_enum *code)
 568 {
 569         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 570
 571         if (code->pad != 0 || code->index != 0)
 572                 return -EINVAL;
 573
 574         code->code = sensor->fmt.code;
 575
 576         return 0;
 577 }
 578
 579 static int ov2680_get_fmt(struct v4l2_subdev *sd,
 580                           struct v4l2_subdev_state *sd_state,
 581                           struct v4l2_subdev_format *format)
 582 {
 583         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 584         struct v4l2_mbus_framefmt *fmt = NULL;
 585
 586         if (format->pad != 0)
 587                 return -EINVAL;
 588
 589         mutex_lock(&sensor->lock);
 590
 591         if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 592                 fmt = v4l2_subdev_get_try_format(&sensor->sd, sd_state,
 593                                                  format->pad);
 594         } else {
 595                 fmt = &sensor->fmt;
 596         }
 597
 598         format->format = *fmt;
 599
 600         mutex_unlock(&sensor->lock);
 601
 602         return 0;
 603 }
 604
 605 static int ov2680_set_fmt(struct v4l2_subdev *sd,
 606                           struct v4l2_subdev_state *sd_state,
 607                           struct v4l2_subdev_format *format)
 608 {
 609         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 610         struct v4l2_mbus_framefmt *try_fmt;
 611         const struct ov2680_mode_info *mode;
 612         int ret = 0;
 613
 614         if (format->pad != 0)
 615                 return -EINVAL;
 616
 617         mode = v4l2_find_nearest_size(ov2680_mode_data,
 618                                       ARRAY_SIZE(ov2680_mode_data),
 619                                       width, height,
 620                                       format->format.width,
 621                                       format->format.height);
 622         if (!mode)
 623                 return -EINVAL;
 624
 625         ov2680_fill_format(sensor, &format->format, mode->width, mode->height);
 626
 627         if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 628                 try_fmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
 629                 *try_fmt = format->format;
 630                 return 0;
 631         }
 632
 633         mutex_lock(&sensor->lock);
 634
 635         if (sensor->is_streaming) {
 636                 ret = -EBUSY;
 637                 goto unlock;
 638         }
 639
 640         sensor->current_mode = mode;
 641         sensor->fmt = format->format;
 642         sensor->mode_pending_changes = true;
 643
 644 unlock:
 645         mutex_unlock(&sensor->lock);
 646
 647         return ret;
 648 }
 649
 650 static int ov2680_init_cfg(struct v4l2_subdev *sd,
 651                            struct v4l2_subdev_state *sd_state)
 652 {
 653         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 654
 655         ov2680_fill_format(sensor, &sd_state->pads[0].try_fmt,
 656                            OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
 657         return 0;
 658 }
 659
 660 static int ov2680_enum_frame_size(struct v4l2_subdev *sd,
 661                                   struct v4l2_subdev_state *sd_state,
 662                                   struct v4l2_subdev_frame_size_enum *fse)
 663 {
 664         int index = fse->index;
 665
 666         if (index >= OV2680_MODE_MAX || index < 0)
 667                 return -EINVAL;
 668
 669         fse->min_width = ov2680_mode_data[index].width;
 670         fse->min_height = ov2680_mode_data[index].height;
 671         fse->max_width = ov2680_mode_data[index].width;
 672         fse->max_height = ov2680_mode_data[index].height;
 673
 674         return 0;
 675 }
 676
 677 static int ov2680_enum_frame_interval(struct v4l2_subdev *sd,
 678                               struct v4l2_subdev_state *sd_state,
 679                               struct v4l2_subdev_frame_interval_enum *fie)
 680 {
 681         struct v4l2_fract tpf;
 682
 683         if (fie->index >= OV2680_MODE_MAX || fie->width > OV2680_WIDTH_MAX ||
 684             fie->height > OV2680_HEIGHT_MAX ||
 685             fie->which > V4L2_SUBDEV_FORMAT_ACTIVE)
 686                 return -EINVAL;
 687
 688         tpf.denominator = OV2680_FRAME_RATE;
 689         tpf.numerator = 1;
 690
 691         fie->interval = tpf;
 692
 693         return 0;
 694 }
 695
 696 static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
 697 {
 698         struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
 699         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 700
 701         if (!sensor->is_enabled)
 702                 return 0;
 703
 704         switch (ctrl->id) {
 705         case V4L2_CID_GAIN:
 706                 return ov2680_gain_set(sensor, ctrl->val);
 707         case V4L2_CID_EXPOSURE:
 708                 return ov2680_exposure_set(sensor, ctrl->val);
 709         case V4L2_CID_VFLIP:
 710                 return ov2680_set_vflip(sensor, ctrl->val);
 711         case V4L2_CID_HFLIP:
 712                 return ov2680_set_hflip(sensor, ctrl->val);
 713         case V4L2_CID_TEST_PATTERN:
 714                 return ov2680_test_pattern_set(sensor, ctrl->val);
 715         default:
 716                 break;
 717         }
 718
 719         return -EINVAL;
 720 }
 721
 722 static const struct v4l2_ctrl_ops ov2680_ctrl_ops = {
 723         .s_ctrl = ov2680_s_ctrl,
 724 };
 725
 726 static const struct v4l2_subdev_core_ops ov2680_core_ops = {
 727         .s_power = ov2680_s_power,
 728 };
 729
 730 static const struct v4l2_subdev_video_ops ov2680_video_ops = {
 731         .g_frame_interval       = ov2680_s_g_frame_interval,
 732         .s_frame_interval       = ov2680_s_g_frame_interval,
 733         .s_stream               = ov2680_s_stream,
 734 };
 735
 736 static const struct v4l2_subdev_pad_ops ov2680_pad_ops = {
 737         .init_cfg               = ov2680_init_cfg,
 738         .enum_mbus_code         = ov2680_enum_mbus_code,
 739         .get_fmt                = ov2680_get_fmt,
 740         .set_fmt                = ov2680_set_fmt,
 741         .enum_frame_size        = ov2680_enum_frame_size,
 742         .enum_frame_interval    = ov2680_enum_frame_interval,
 743 };
 744
 745 static const struct v4l2_subdev_ops ov2680_subdev_ops = {
 746         .core   = &ov2680_core_ops,
 747         .video  = &ov2680_video_ops,
 748         .pad    = &ov2680_pad_ops,
 749 };
 750
 751 static int ov2680_mode_init(struct ov2680_dev *sensor)
 752 {
 753         const struct ov2680_mode_info *init_mode;
 754
 755         /* set initial mode */
 756         ov2680_fill_format(sensor, &sensor->fmt,
 757                            OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
 758
 759         sensor->frame_interval.denominator = OV2680_FRAME_RATE;
 760         sensor->frame_interval.numerator = 1;
 761
 762         init_mode = &ov2680_mode_init_data;
 763
 764         sensor->current_mode = init_mode;
 765
 766         sensor->mode_pending_changes = true;
 767
 768         return 0;
 769 }
 770
 771 static int ov2680_v4l2_register(struct ov2680_dev *sensor)
 772 {
 773         const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
 774         struct ov2680_ctrls *ctrls = &sensor->ctrls;
 775         struct v4l2_ctrl_handler *hdl = &ctrls->handler;
 776         int ret = 0;
 777
 778         v4l2_i2c_subdev_init(&sensor->sd, sensor->i2c_client,
 779                              &ov2680_subdev_ops);
 780
 781         sensor->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
 782         sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
 783         sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 784
 785         ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
 786         if (ret < 0)
 787                 return ret;
 788
 789         v4l2_ctrl_handler_init(hdl, 5);
 790
 791         hdl->lock = &sensor->lock;
 792
 793         ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
 794         ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
 795
 796         ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl,
 797                                         &ov2680_ctrl_ops, V4L2_CID_TEST_PATTERN,
 798                                         ARRAY_SIZE(test_pattern_menu) - 1,
 799                                         0, 0, test_pattern_menu);
 800
 801         ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
 802                                             0, 32767, 1, 0);
 803
 804         ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 2047, 1, 0);
 805
 806         if (hdl->error) {
 807                 ret = hdl->error;
 808                 goto cleanup_entity;
 809         }
 810
 811         ctrls->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
 812         ctrls->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
 813
 814         sensor->sd.ctrl_handler = hdl;
 815
 816         ret = v4l2_async_register_subdev(&sensor->sd);
 817         if (ret < 0)
 818                 goto cleanup_entity;
 819
 820         return 0;
 821
 822 cleanup_entity:
 823         media_entity_cleanup(&sensor->sd.entity);
 824         v4l2_ctrl_handler_free(hdl);
 825
 826         return ret;
 827 }
 828
 829 static int ov2680_get_regulators(struct ov2680_dev *sensor)
 830 {
 831         int i;
 832
 833         for (i = 0; i < OV2680_NUM_SUPPLIES; i++)
 834                 sensor->supplies[i].supply = ov2680_supply_name[i];
 835
 836         return devm_regulator_bulk_get(&sensor->i2c_client->dev,
 837                                        OV2680_NUM_SUPPLIES,
 838                                        sensor->supplies);
 839 }
 840
 841 static int ov2680_check_id(struct ov2680_dev *sensor)
 842 {
 843         struct device *dev = ov2680_to_dev(sensor);
 844         u32 chip_id;
 845         int ret;
 846
 847         ov2680_power_on(sensor);
 848
 849         ret = ov2680_read_reg16(sensor, OV2680_REG_CHIP_ID_HIGH, &chip_id);
 850         if (ret < 0) {
 851                 dev_err(dev, "failed to read chip id high\n");
 852                 return -ENODEV;
 853         }
 854
 855         if (chip_id != OV2680_CHIP_ID) {
 856                 dev_err(dev, "chip id: 0x%04x does not match expected 0x%04x\n",
 857                         chip_id, OV2680_CHIP_ID);
 858                 return -ENODEV;
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int ov2680_parse_dt(struct ov2680_dev *sensor)
 865 {
 866         struct device *dev = ov2680_to_dev(sensor);
 867         int ret;
 868
 869         sensor->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 870                                                      GPIOD_OUT_HIGH);
 871         ret = PTR_ERR_OR_ZERO(sensor->reset_gpio);
 872         if (ret < 0) {
 873                 dev_dbg(dev, "error while getting reset gpio: %d\n", ret);
 874                 return ret;
 875         }
 876
 877         sensor->xvclk = devm_clk_get(dev, "xvclk");
 878         if (IS_ERR(sensor->xvclk)) {
 879                 dev_err(dev, "xvclk clock missing or invalid\n");
 880                 return PTR_ERR(sensor->xvclk);
 881         }
 882
 883         sensor->xvclk_freq = clk_get_rate(sensor->xvclk);
 884         if (sensor->xvclk_freq != OV2680_XVCLK_VALUE) {
 885                 dev_err(dev, "wrong xvclk frequency %d HZ, expected: %d Hz\n",
 886                         sensor->xvclk_freq, OV2680_XVCLK_VALUE);
 887                 return -EINVAL;
 888         }
 889
 890         return 0;
 891 }
 892
 893 static int ov2680_probe(struct i2c_client *client)
 894 {
 895         struct device *dev = &client->dev;
 896         struct ov2680_dev *sensor;
 897         int ret;
 898
 899         sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
 900         if (!sensor)
 901                 return -ENOMEM;
 902
 903         sensor->i2c_client = client;
 904
 905         ret = ov2680_parse_dt(sensor);
 906         if (ret < 0)
 907                 return -EINVAL;
 908
 909         ret = ov2680_mode_init(sensor);
 910         if (ret < 0)
 911                 return ret;
 912
 913         ret = ov2680_get_regulators(sensor);
 914         if (ret < 0) {
 915                 dev_err(dev, "failed to get regulators\n");
 916                 return ret;
 917         }
 918
 919         mutex_init(&sensor->lock);
 920
 921         ret = ov2680_check_id(sensor);
 922         if (ret < 0)
 923                 goto lock_destroy;
 924
 925         ret = ov2680_v4l2_register(sensor);
 926         if (ret < 0)
 927                 goto lock_destroy;
 928
 929         dev_info(dev, "ov2680 init correctly\n");
 930
 931         return 0;
 932
 933 lock_destroy:
 934         dev_err(dev, "ov2680 init fail: %d\n", ret);
 935         mutex_destroy(&sensor->lock);
 936
 937         return ret;
 938 }
 939
 940 static void ov2680_remove(struct i2c_client *client)
 941 {
 942         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 943         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 944
 945         v4l2_async_unregister_subdev(&sensor->sd);
 946         mutex_destroy(&sensor->lock);
 947         media_entity_cleanup(&sensor->sd.entity);
 948         v4l2_ctrl_handler_free(&sensor->ctrls.handler);
 949 }
 950
 951 static int __maybe_unused ov2680_suspend(struct device *dev)
 952 {
 953         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 954         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 955
 956         if (sensor->is_streaming)
 957                 ov2680_stream_disable(sensor);
 958
 959         return 0;
 960 }
 961
 962 static int __maybe_unused ov2680_resume(struct device *dev)
 963 {
 964         struct v4l2_subdev *sd = dev_get_drvdata(dev);
 965         struct ov2680_dev *sensor = to_ov2680_dev(sd);
 966         int ret;
 967
 968         if (sensor->is_streaming) {
 969                 ret = ov2680_stream_enable(sensor);
 970                 if (ret < 0)
 971                         goto stream_disable;
 972         }
 973
 974         return 0;
 975
 976 stream_disable:
 977         ov2680_stream_disable(sensor);
 978         sensor->is_streaming = false;
 979
 980         return ret;
 981 }
 982
 983 static const struct dev_pm_ops ov2680_pm_ops = {
 984         SET_SYSTEM_SLEEP_PM_OPS(ov2680_suspend, ov2680_resume)
 985 };
 986
 987 static const struct of_device_id ov2680_dt_ids[] = {
 988         { .compatible = "ovti,ov2680" },
 989         { /* sentinel */ },
 990 };
 991 MODULE_DEVICE_TABLE(of, ov2680_dt_ids);
 992
 993 static struct i2c_driver ov2680_i2c_driver = {
 994         .driver = {
 995                 .name  = "ov2680",
 996                 .pm = &ov2680_pm_ops,
 997                 .of_match_table = of_match_ptr(ov2680_dt_ids),
 998         },
 999         .probe_new      = ov2680_probe,
1000         .remove         = ov2680_remove,
1001 };
1002 module_i2c_driver(ov2680_i2c_driver);
1003
1004 MODULE_AUTHOR("Rui Miguel Silva <rui.silva@linaro.org>");
1005 MODULE_DESCRIPTION("OV2680 CMOS Image Sensor driver");
1006 MODULE_LICENSE("GPL v2");