text: /*
   * Driver for the OV5645 camera sensor.
   *
   * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
   * Copyright (C) 2015 By Tech Design S.L. All Rights Reserved.
   * Copyright (C) 2012-2013 Freescale Semiconductor, Inc. All Rights Reserved.
   *
   * Based on:
   * - the OV5645 driver from QC msm-3.10 kernel on codeaurora.org:
   *   https://us.codeaurora.org/cgit/quic/la/kernel/msm-3.10/tree/drivers/
   *       media/platform/msm/camera_v2/sensor/ov5645.c?h=LA.BR.1.2.4_rb1.41
   * - the OV5640 driver posted on linux-media:
   *   https://www.mail-archive.com/linux-media%40vger.kernel.org/msg92671.html
   */
  
  /*
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
  
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  
  #include <linux/bitops.h>
  #include <linux/clk.h>
  #include <linux/delay.h>
  #include <linux/device.h>
  #include <linux/gpio/consumer.h>
  #include <linux/i2c.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/of_graph.h>
  #include <linux/regulator/consumer.h>
  #include <linux/slab.h>
  #include <linux/types.h>
  #include <media/v4l2-ctrls.h>
  #include <media/v4l2-fwnode.h>
  #include <media/v4l2-subdev.h>
  
  #define OV5645_VOLTAGE_ANALOG               2800000
  #define OV5645_VOLTAGE_DIGITAL_CORE         1500000
  #define OV5645_VOLTAGE_DIGITAL_IO           1800000
  
  #define OV5645_SYSTEM_CTRL0		0x3008
  #define		OV5645_SYSTEM_CTRL0_START	0x02
  #define		OV5645_SYSTEM_CTRL0_STOP	0x42
  #define OV5645_CHIP_ID_HIGH		0x300a
  #define		OV5645_CHIP_ID_HIGH_BYTE	0x56
  #define OV5645_CHIP_ID_LOW		0x300b
  #define		OV5645_CHIP_ID_LOW_BYTE		0x45
  #define OV5645_AWB_MANUAL_CONTROL	0x3406
  #define		OV5645_AWB_MANUAL_ENABLE	BIT(0)
  #define OV5645_AEC_PK_MANUAL		0x3503
  #define		OV5645_AEC_MANUAL_ENABLE	BIT(0)
  #define		OV5645_AGC_MANUAL_ENABLE	BIT(1)
  #define OV5645_TIMING_TC_REG20		0x3820
  #define		OV5645_SENSOR_VFLIP		BIT(1)
  #define		OV5645_ISP_VFLIP		BIT(2)
  #define OV5645_TIMING_TC_REG21		0x3821
  #define		OV5645_SENSOR_MIRROR		BIT(1)
  #define OV5645_PRE_ISP_TEST_SETTING_1	0x503d
  #define		OV5645_TEST_PATTERN_MASK	0x3
  #define		OV5645_SET_TEST_PATTERN(x)	((x) & OV5645_TEST_PATTERN_MASK)
  #define		OV5645_TEST_PATTERN_ENABLE	BIT(7)
  #define OV5645_SDE_SAT_U		0x5583
  #define OV5645_SDE_SAT_V		0x5584
  
  struct reg_value {
  	u16 reg;
  	u8 val;
  };
  
  struct ov5645_mode_info {
  	u32 width;
  	u32 height;
  	const struct reg_value *data;
  	u32 data_size;
  };
  
  struct ov5645 {
  	struct i2c_client *i2c_client;
  	struct device *dev;
  	struct v4l2_subdev sd;
  	struct media_pad pad;
  	struct v4l2_fwnode_endpoint ep;
  	struct v4l2_mbus_framefmt fmt;
  	struct v4l2_rect crop;
  	struct clk *xclk;
  
  	struct regulator *io_regulator;
  	struct regulator *core_regulator;
  	struct regulator *analog_regulator;
  
  	const struct ov5645_mode_info *current_mode;
  
  	struct v4l2_ctrl_handler ctrls;
  
  	/* Cached register values */
  	u8 aec_pk_manual;
  	u8 timing_tc_reg20;
  	u8 timing_tc_reg21;
  
  	struct mutex power_lock; /* lock to protect power state */
  	int power_count;
  
  	struct gpio_desc *enable_gpio;
  	struct gpio_desc *rst_gpio;
  };
  
  static inline struct ov5645 *to_ov5645(struct v4l2_subdev *sd)
  {
  	return container_of(sd, struct ov5645, sd);
  }
  
  static const struct reg_value ov5645_global_init_setting[] = {
  	{ 0x3103, 0x11 },
  	{ 0x3008, 0x82 },
  	{ 0x3008, 0x42 },
  	{ 0x3103, 0x03 },
  	{ 0x3503, 0x07 },
  	{ 0x3002, 0x1c },
  	{ 0x3006, 0xc3 },
  	{ 0x300e, 0x45 },
  	{ 0x3017, 0x00 },
  	{ 0x3018, 0x00 },
  	{ 0x302e, 0x0b },
  	{ 0x3037, 0x13 },
  	{ 0x3108, 0x01 },
  	{ 0x3611, 0x06 },
  	{ 0x3500, 0x00 },
  	{ 0x3501, 0x01 },
  	{ 0x3502, 0x00 },
  	{ 0x350a, 0x00 },
  	{ 0x350b, 0x3f },
  	{ 0x3620, 0x33 },
  	{ 0x3621, 0xe0 },
  	{ 0x3622, 0x01 },
  	{ 0x3630, 0x2e },
  	{ 0x3631, 0x00 },
  	{ 0x3632, 0x32 },
  	{ 0x3633, 0x52 },
  	{ 0x3634, 0x70 },
  	{ 0x3635, 0x13 },
  	{ 0x3636, 0x03 },
  	{ 0x3703, 0x5a },
  	{ 0x3704, 0xa0 },
  	{ 0x3705, 0x1a },
  	{ 0x3709, 0x12 },
  	{ 0x370b, 0x61 },
  	{ 0x370f, 0x10 },
  	{ 0x3715, 0x78 },
  	{ 0x3717, 0x01 },
  	{ 0x371b, 0x20 },
  	{ 0x3731, 0x12 },
  	{ 0x3901, 0x0a },
  	{ 0x3905, 0x02 },
  	{ 0x3906, 0x10 },
  	{ 0x3719, 0x86 },
  	{ 0x3810, 0x00 },
  	{ 0x3811, 0x10 },
  	{ 0x3812, 0x00 },
  	{ 0x3821, 0x01 },
  	{ 0x3824, 0x01 },
  	{ 0x3826, 0x03 },
  	{ 0x3828, 0x08 },
  	{ 0x3a19, 0xf8 },
  	{ 0x3c01, 0x34 },
  	{ 0x3c04, 0x28 },
  	{ 0x3c05, 0x98 },
  	{ 0x3c07, 0x07 },
  	{ 0x3c09, 0xc2 },
  	{ 0x3c0a, 0x9c },
  	{ 0x3c0b, 0x40 },
  	{ 0x3c01, 0x34 },
  	{ 0x4001, 0x02 },
  	{ 0x4514, 0x00 },
  	{ 0x4520, 0xb0 },
  	{ 0x460b, 0x37 },
  	{ 0x460c, 0x20 },
  	{ 0x4818, 0x01 },
  	{ 0x481d, 0xf0 },
  	{ 0x481f, 0x50 },
  	{ 0x4823, 0x70 },
  	{ 0x4831, 0x14 },
  	{ 0x5000, 0xa7 },
  	{ 0x5001, 0x83 },
  	{ 0x501d, 0x00 },
  	{ 0x501f, 0x00 },
  	{ 0x503d, 0x00 },
  	{ 0x505c, 0x30 },
  	{ 0x5181, 0x59 },
  	{ 0x5183, 0x00 },
  	{ 0x5191, 0xf0 },
  	{ 0x5192, 0x03 },
  	{ 0x5684, 0x10 },
  	{ 0x5685, 0xa0 },
  	{ 0x5686, 0x0c },
  	{ 0x5687, 0x78 },
  	{ 0x5a00, 0x08 },
  	{ 0x5a21, 0x00 },
  	{ 0x5a24, 0x00 },
  	{ 0x3008, 0x02 },
  	{ 0x3503, 0x00 },
  	{ 0x5180, 0xff },
  	{ 0x5181, 0xf2 },
  	{ 0x5182, 0x00 },
  	{ 0x5183, 0x14 },
  	{ 0x5184, 0x25 },
  	{ 0x5185, 0x24 },
  	{ 0x5186, 0x09 },
  	{ 0x5187, 0x09 },
  	{ 0x5188, 0x0a },
  	{ 0x5189, 0x75 },
  	{ 0x518a, 0x52 },
  	{ 0x518b, 0xea },
  	{ 0x518c, 0xa8 },
  	{ 0x518d, 0x42 },
  	{ 0x518e, 0x38 },
  	{ 0x518f, 0x56 },
  	{ 0x5190, 0x42 },
  	{ 0x5191, 0xf8 },
  	{ 0x5192, 0x04 },
  	{ 0x5193, 0x70 },
  	{ 0x5194, 0xf0 },
  	{ 0x5195, 0xf0 },
  	{ 0x5196, 0x03 },
  	{ 0x5197, 0x01 },
  	{ 0x5198, 0x04 },
  	{ 0x5199, 0x12 },
  	{ 0x519a, 0x04 },
  	{ 0x519b, 0x00 },
  	{ 0x519c, 0x06 },
  	{ 0x519d, 0x82 },
  	{ 0x519e, 0x38 },
  	{ 0x5381, 0x1e },
  	{ 0x5382, 0x5b },
  	{ 0x5383, 0x08 },
  	{ 0x5384, 0x0a },
  	{ 0x5385, 0x7e },
  	{ 0x5386, 0x88 },
  	{ 0x5387, 0x7c },
  	{ 0x5388, 0x6c },
  	{ 0x5389, 0x10 },
  	{ 0x538a, 0x01 },
  	{ 0x538b, 0x98 },
  	{ 0x5300, 0x08 },
  	{ 0x5301, 0x30 },
  	{ 0x5302, 0x10 },
  	{ 0x5303, 0x00 },
  	{ 0x5304, 0x08 },
  	{ 0x5305, 0x30 },
  	{ 0x5306, 0x08 },
  	{ 0x5307, 0x16 },
  	{ 0x5309, 0x08 },
  	{ 0x530a, 0x30 },
  	{ 0x530b, 0x04 },
  	{ 0x530c, 0x06 },
  	{ 0x5480, 0x01 },
  	{ 0x5481, 0x08 },
  	{ 0x5482, 0x14 },
  	{ 0x5483, 0x28 },
  	{ 0x5484, 0x51 },
  	{ 0x5485, 0x65 },
  	{ 0x5486, 0x71 },
  	{ 0x5487, 0x7d },
  	{ 0x5488, 0x87 },
  	{ 0x5489, 0x91 },
  	{ 0x548a, 0x9a },
  	{ 0x548b, 0xaa },
  	{ 0x548c, 0xb8 },
  	{ 0x548d, 0xcd },
  	{ 0x548e, 0xdd },
  	{ 0x548f, 0xea },
  	{ 0x5490, 0x1d },
  	{ 0x5580, 0x02 },
  	{ 0x5583, 0x40 },
  	{ 0x5584, 0x10 },
  	{ 0x5589, 0x10 },
  	{ 0x558a, 0x00 },
  	{ 0x558b, 0xf8 },
  	{ 0x5800, 0x3f },
  	{ 0x5801, 0x16 },
  	{ 0x5802, 0x0e },
  	{ 0x5803, 0x0d },
  	{ 0x5804, 0x17 },
  	{ 0x5805, 0x3f },
  	{ 0x5806, 0x0b },
  	{ 0x5807, 0x06 },
  	{ 0x5808, 0x04 },
  	{ 0x5809, 0x04 },
  	{ 0x580a, 0x06 },
  	{ 0x580b, 0x0b },
  	{ 0x580c, 0x09 },
  	{ 0x580d, 0x03 },
  	{ 0x580e, 0x00 },
  	{ 0x580f, 0x00 },
  	{ 0x5810, 0x03 },
  	{ 0x5811, 0x08 },
  	{ 0x5812, 0x0a },
  	{ 0x5813, 0x03 },
  	{ 0x5814, 0x00 },
  	{ 0x5815, 0x00 },
  	{ 0x5816, 0x04 },
  	{ 0x5817, 0x09 },
  	{ 0x5818, 0x0f },
  	{ 0x5819, 0x08 },
  	{ 0x581a, 0x06 },
  	{ 0x581b, 0x06 },
  	{ 0x581c, 0x08 },
  	{ 0x581d, 0x0c },
  	{ 0x581e, 0x3f },
  	{ 0x581f, 0x1e },
  	{ 0x5820, 0x12 },
  	{ 0x5821, 0x13 },
  	{ 0x5822, 0x21 },
  	{ 0x5823, 0x3f },
  	{ 0x5824, 0x68 },
  	{ 0x5825, 0x28 },
  	{ 0x5826, 0x2c },
  	{ 0x5827, 0x28 },
  	{ 0x5828, 0x08 },
  	{ 0x5829, 0x48 },
  	{ 0x582a, 0x64 },
  	{ 0x582b, 0x62 },
  	{ 0x582c, 0x64 },
  	{ 0x582d, 0x28 },
  	{ 0x582e, 0x46 },
  	{ 0x582f, 0x62 },
  	{ 0x5830, 0x60 },
  	{ 0x5831, 0x62 },
  	{ 0x5832, 0x26 },
  	{ 0x5833, 0x48 },
  	{ 0x5834, 0x66 },
  	{ 0x5835, 0x44 },
  	{ 0x5836, 0x64 },
  	{ 0x5837, 0x28 },
  	{ 0x5838, 0x66 },
  	{ 0x5839, 0x48 },
  	{ 0x583a, 0x2c },
  	{ 0x583b, 0x28 },
  	{ 0x583c, 0x26 },
  	{ 0x583d, 0xae },
  	{ 0x5025, 0x00 },
  	{ 0x3a0f, 0x30 },
  	{ 0x3a10, 0x28 },
  	{ 0x3a1b, 0x30 },
  	{ 0x3a1e, 0x26 },
  	{ 0x3a11, 0x60 },
  	{ 0x3a1f, 0x14 },
  	{ 0x0601, 0x02 },
  	{ 0x3008, 0x42 },
  	{ 0x3008, 0x02 }
  };
  
  static const struct reg_value ov5645_setting_sxga[] = {
  	{ 0x3612, 0xa9 },
  	{ 0x3614, 0x50 },
  	{ 0x3618, 0x00 },
  	{ 0x3034, 0x18 },
  	{ 0x3035, 0x21 },
  	{ 0x3036, 0x70 },
  	{ 0x3600, 0x09 },
  	{ 0x3601, 0x43 },
  	{ 0x3708, 0x66 },
  	{ 0x370c, 0xc3 },
  	{ 0x3800, 0x00 },
  	{ 0x3801, 0x00 },
  	{ 0x3802, 0x00 },
  	{ 0x3803, 0x06 },
  	{ 0x3804, 0x0a },
  	{ 0x3805, 0x3f },
  	{ 0x3806, 0x07 },
  	{ 0x3807, 0x9d },
  	{ 0x3808, 0x05 },
  	{ 0x3809, 0x00 },
  	{ 0x380a, 0x03 },
  	{ 0x380b, 0xc0 },
  	{ 0x380c, 0x07 },
  	{ 0x380d, 0x68 },
  	{ 0x380e, 0x03 },
  	{ 0x380f, 0xd8 },
  	{ 0x3813, 0x06 },
  	{ 0x3814, 0x31 },
  	{ 0x3815, 0x31 },
  	{ 0x3820, 0x47 },
  	{ 0x3a02, 0x03 },
  	{ 0x3a03, 0xd8 },
  	{ 0x3a08, 0x01 },
  	{ 0x3a09, 0xf8 },
  	{ 0x3a0a, 0x01 },
  	{ 0x3a0b, 0xa4 },
  	{ 0x3a0e, 0x02 },
  	{ 0x3a0d, 0x02 },
  	{ 0x3a14, 0x03 },
  	{ 0x3a15, 0xd8 },
  	{ 0x3a18, 0x00 },
  	{ 0x4004, 0x02 },
  	{ 0x4005, 0x18 },
  	{ 0x4300, 0x32 },
  	{ 0x4202, 0x00 }
  };
  
  static const struct reg_value ov5645_setting_1080p[] = {
  	{ 0x3612, 0xab },
  	{ 0x3614, 0x50 },
  	{ 0x3618, 0x04 },
  	{ 0x3034, 0x18 },
  	{ 0x3035, 0x11 },
  	{ 0x3036, 0x54 },
  	{ 0x3600, 0x08 },
  	{ 0x3601, 0x33 },
  	{ 0x3708, 0x63 },
  	{ 0x370c, 0xc0 },
  	{ 0x3800, 0x01 },
  	{ 0x3801, 0x50 },
  	{ 0x3802, 0x01 },
  	{ 0x3803, 0xb2 },
  	{ 0x3804, 0x08 },
  	{ 0x3805, 0xef },
  	{ 0x3806, 0x05 },
  	{ 0x3807, 0xf1 },
  	{ 0x3808, 0x07 },
  	{ 0x3809, 0x80 },
  	{ 0x380a, 0x04 },
  	{ 0x380b, 0x38 },
  	{ 0x380c, 0x09 },
  	{ 0x380d, 0xc4 },
  	{ 0x380e, 0x04 },
  	{ 0x380f, 0x60 },
  	{ 0x3813, 0x04 },
  	{ 0x3814, 0x11 },
  	{ 0x3815, 0x11 },
  	{ 0x3820, 0x47 },
  	{ 0x4514, 0x88 },
  	{ 0x3a02, 0x04 },
  	{ 0x3a03, 0x60 },
  	{ 0x3a08, 0x01 },
  	{ 0x3a09, 0x50 },
  	{ 0x3a0a, 0x01 },
  	{ 0x3a0b, 0x18 },
  	{ 0x3a0e, 0x03 },
  	{ 0x3a0d, 0x04 },
  	{ 0x3a14, 0x04 },
  	{ 0x3a15, 0x60 },
  	{ 0x3a18, 0x00 },
  	{ 0x4004, 0x06 },
  	{ 0x4005, 0x18 },
  	{ 0x4300, 0x32 },
  	{ 0x4202, 0x00 },
  	{ 0x4837, 0x0b }
  };
  
  static const struct reg_value ov5645_setting_full[] = {
  	{ 0x3612, 0xab },
  	{ 0x3614, 0x50 },
  	{ 0x3618, 0x04 },
  	{ 0x3034, 0x18 },
  	{ 0x3035, 0x11 },
  	{ 0x3036, 0x54 },
  	{ 0x3600, 0x08 },
  	{ 0x3601, 0x33 },
  	{ 0x3708, 0x63 },
  	{ 0x370c, 0xc0 },
  	{ 0x3800, 0x00 },
  	{ 0x3801, 0x00 },
  	{ 0x3802, 0x00 },
  	{ 0x3803, 0x00 },
  	{ 0x3804, 0x0a },
  	{ 0x3805, 0x3f },
  	{ 0x3806, 0x07 },
  	{ 0x3807, 0x9f },
  	{ 0x3808, 0x0a },
  	{ 0x3809, 0x20 },
  	{ 0x380a, 0x07 },
  	{ 0x380b, 0x98 },
  	{ 0x380c, 0x0b },
  	{ 0x380d, 0x1c },
  	{ 0x380e, 0x07 },
  	{ 0x380f, 0xb0 },
  	{ 0x3813, 0x06 },
  	{ 0x3814, 0x11 },
  	{ 0x3815, 0x11 },
  	{ 0x3820, 0x47 },
  	{ 0x4514, 0x88 },
  	{ 0x3a02, 0x07 },
  	{ 0x3a03, 0xb0 },
  	{ 0x3a08, 0x01 },
  	{ 0x3a09, 0x27 },
  	{ 0x3a0a, 0x00 },
  	{ 0x3a0b, 0xf6 },
  	{ 0x3a0e, 0x06 },
  	{ 0x3a0d, 0x08 },
  	{ 0x3a14, 0x07 },
  	{ 0x3a15, 0xb0 },
  	{ 0x3a18, 0x01 },
  	{ 0x4004, 0x06 },
  	{ 0x4005, 0x18 },
  	{ 0x4300, 0x32 },
  	{ 0x4837, 0x0b },
  	{ 0x4202, 0x00 }
  };
  
  static const struct ov5645_mode_info ov5645_mode_info_data[] = {
  	{
  		.width = 1280,
  		.height = 960,
  		.data = ov5645_setting_sxga,
  		.data_size = ARRAY_SIZE(ov5645_setting_sxga)
  	},
  	{
  		.width = 1920,
  		.height = 1080,
  		.data = ov5645_setting_1080p,
  		.data_size = ARRAY_SIZE(ov5645_setting_1080p)
  	},
  	{
  		.width = 2592,
  		.height = 1944,
  		.data = ov5645_setting_full,
  		.data_size = ARRAY_SIZE(ov5645_setting_full)
  	},
  };
  
  static int ov5645_regulators_enable(struct ov5645 *ov5645)
  {
  	int ret;
  
  	ret = regulator_enable(ov5645->io_regulator);
  	if (ret < 0) {
  		dev_err(ov5645->dev, "set io voltage failed\n");
  		return ret;
  	}
  
  	ret = regulator_enable(ov5645->analog_regulator);
  	if (ret) {
  		dev_err(ov5645->dev, "set analog voltage failed\n");
  		goto err_disable_io;
  	}
  
  	ret = regulator_enable(ov5645->core_regulator);
  	if (ret) {
  		dev_err(ov5645->dev, "set core voltage failed\n");
  		goto err_disable_analog;
  	}
  
  	return 0;
  
  err_disable_analog:
  	regulator_disable(ov5645->analog_regulator);
  err_disable_io:
  	regulator_disable(ov5645->io_regulator);
  
  	return ret;
  }
  
  static void ov5645_regulators_disable(struct ov5645 *ov5645)
  {
  	int ret;
  
  	ret = regulator_disable(ov5645->core_regulator);
  	if (ret < 0)
  		dev_err(ov5645->dev, "core regulator disable failed\n");
  
  	ret = regulator_disable(ov5645->analog_regulator);
  	if (ret < 0)
  		dev_err(ov5645->dev, "analog regulator disable failed\n");
  
  	ret = regulator_disable(ov5645->io_regulator);
  	if (ret < 0)
  		dev_err(ov5645->dev, "io regulator disable failed\n");
  }
  
  static int ov5645_write_reg(struct ov5645 *ov5645, u16 reg, u8 val)
  {
  	u8 regbuf[3];
  	int ret;
  
  	regbuf[0] = reg >> 8;
  	regbuf[1] = reg & 0xff;
  	regbuf[2] = val;
  
  	ret = i2c_master_send(ov5645->i2c_client, regbuf, 3);
  	if (ret < 0)
  		dev_err(ov5645->dev, "%s: write reg error %d: reg=%x, val=%x\n",
  			__func__, ret, reg, val);
  
  	return ret;
  }
  
  static int ov5645_read_reg(struct ov5645 *ov5645, u16 reg, u8 *val)
  {
  	u8 regbuf[2];
  	int ret;
  
  	regbuf[0] = reg >> 8;
  	regbuf[1] = reg & 0xff;
  
  	ret = i2c_master_send(ov5645->i2c_client, regbuf, 2);
  	if (ret < 0) {
  		dev_err(ov5645->dev, "%s: write reg error %d: reg=%x\n",
  			__func__, ret, reg);
  		return ret;
  	}
  
  	ret = i2c_master_recv(ov5645->i2c_client, val, 1);
  	if (ret < 0) {
  		dev_err(ov5645->dev, "%s: read reg error %d: reg=%x\n",
  			__func__, ret, reg);
  		return ret;
  	}
  
  	return 0;
  }
  
  static int ov5645_set_aec_mode(struct ov5645 *ov5645, u32 mode)
  {
  	u8 val = ov5645->aec_pk_manual;
  	int ret;
  
  	if (mode == V4L2_EXPOSURE_AUTO)
  		val &= ~OV5645_AEC_MANUAL_ENABLE;
  	else /* V4L2_EXPOSURE_MANUAL */
  		val |= OV5645_AEC_MANUAL_ENABLE;
  
  	ret = ov5645_write_reg(ov5645, OV5645_AEC_PK_MANUAL, val);
  	if (!ret)
  		ov5645->aec_pk_manual = val;
  
  	return ret;
  }
  
  static int ov5645_set_agc_mode(struct ov5645 *ov5645, u32 enable)
  {
  	u8 val = ov5645->aec_pk_manual;
  	int ret;
  
  	if (enable)
  		val &= ~OV5645_AGC_MANUAL_ENABLE;
  	else
  		val |= OV5645_AGC_MANUAL_ENABLE;
  
  	ret = ov5645_write_reg(ov5645, OV5645_AEC_PK_MANUAL, val);
  	if (!ret)
  		ov5645->aec_pk_manual = val;
  
  	return ret;
  }
  
  static int ov5645_set_register_array(struct ov5645 *ov5645,
  				     const struct reg_value *settings,
  				     unsigned int num_settings)
  {
  	unsigned int i;
  	int ret;
  
  	for (i = 0; i < num_settings; ++i, ++settings) {
  		ret = ov5645_write_reg(ov5645, settings->reg, settings->val);
  		if (ret < 0)
  			return ret;
  	}
  
  	return 0;
  }
  
  static int ov5645_set_power_on(struct ov5645 *ov5645)
  {
  	int ret;
  
  	ret = ov5645_regulators_enable(ov5645);
  	if (ret < 0) {
  		return ret;
  	}
  
  	ret = clk_prepare_enable(ov5645->xclk);
  	if (ret < 0) {
  		dev_err(ov5645->dev, "clk prepare enable failed\n");
  		ov5645_regulators_disable(ov5645);
  		return ret;
  	}
  
  	usleep_range(5000, 15000);
  	gpiod_set_value_cansleep(ov5645->enable_gpio, 1);
  
  	usleep_range(1000, 2000);
  	gpiod_set_value_cansleep(ov5645->rst_gpio, 0);
  
  	msleep(20);
  
  	return 0;
  }
  
  static void ov5645_set_power_off(struct ov5645 *ov5645)
  {
  	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
  	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
  	clk_disable_unprepare(ov5645->xclk);
  	ov5645_regulators_disable(ov5645);
  }
  
  static int ov5645_s_power(struct v4l2_subdev *sd, int on)
  {
  	struct ov5645 *ov5645 = to_ov5645(sd);
  	int ret = 0;
  
  	mutex_lock(&ov5645->power_lock);
  
  	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
  	 * update the power state.
  	 */
  	if (ov5645->power_count == !on) {
  		if (on) {
  			ret = ov5645_set_power_on(ov5645);
  			if (ret < 0)
  				goto exit;
  
  			ret = ov5645_set_register_array(ov5645,
  					ov5645_global_init_setting,
  					ARRAY_SIZE(ov5645_global_init_setting));
  			if (ret < 0) {
  				dev_err(ov5645->dev,
  					"could not set init registers\n");
  				ov5645_set_power_off(ov5645);
  				goto exit;
  			}
  
  			ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
  					       OV5645_SYSTEM_CTRL0_STOP);
  			if (ret < 0) {
  				ov5645_set_power_off(ov5645);
  				goto exit;
  			}
  		} else {
  			ov5645_set_power_off(ov5645);
  		}
  	}
  
  	/* Update the power count. */
  	ov5645->power_count += on ? 1 : -1;
  	WARN_ON(ov5645->power_count < 0);
  
  exit:
  	mutex_unlock(&ov5645->power_lock);
  
  	return ret;
  }
  
  static int ov5645_set_saturation(struct ov5645 *ov5645, s32 value)
  {
  	u32 reg_value = (value * 0x10) + 0x40;
  	int ret;
  
  	ret = ov5645_write_reg(ov5645, OV5645_SDE_SAT_U, reg_value);
  	if (ret < 0)
  		return ret;
  
  	return ov5645_write_reg(ov5645, OV5645_SDE_SAT_V, reg_value);
  }
  
  static int ov5645_set_hflip(struct ov5645 *ov5645, s32 value)
  {
  	u8 val = ov5645->timing_tc_reg21;
  	int ret;
  
  	if (value == 0)
  		val &= ~(OV5645_SENSOR_MIRROR);
  	else
  		val |= (OV5645_SENSOR_MIRROR);
  
  	ret = ov5645_write_reg(ov5645, OV5645_TIMING_TC_REG21, val);
  	if (!ret)
  		ov5645->timing_tc_reg21 = val;
  
  	return ret;
  }
  
  static int ov5645_set_vflip(struct ov5645 *ov5645, s32 value)
  {
  	u8 val = ov5645->timing_tc_reg20;
  	int ret;
  
  	if (value == 0)
  		val |= (OV5645_SENSOR_VFLIP | OV5645_ISP_VFLIP);
  	else
  		val &= ~(OV5645_SENSOR_VFLIP | OV5645_ISP_VFLIP);
  
  	ret = ov5645_write_reg(ov5645, OV5645_TIMING_TC_REG20, val);
  	if (!ret)
  		ov5645->timing_tc_reg20 = val;
  
  	return ret;
  }
  
  static int ov5645_set_test_pattern(struct ov5645 *ov5645, s32 value)
  {
  	u8 val = 0;
  
  	if (value) {
  		val = OV5645_SET_TEST_PATTERN(value - 1);
  		val |= OV5645_TEST_PATTERN_ENABLE;
  	}
  
  	return ov5645_write_reg(ov5645, OV5645_PRE_ISP_TEST_SETTING_1, val);
  }
  
  static const char * const ov5645_test_pattern_menu[] = {
  	"Disabled",
  	"Vertical Color Bars",
  	"Pseudo-Random Data",
  	"Color Square",
  	"Black Image",
  };
  
  static int ov5645_set_awb(struct ov5645 *ov5645, s32 enable_auto)
  {
  	u8 val = 0;
  
  	if (!enable_auto)
  		val = OV5645_AWB_MANUAL_ENABLE;
  
  	return ov5645_write_reg(ov5645, OV5645_AWB_MANUAL_CONTROL, val);
  }
  
  static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct ov5645 *ov5645 = container_of(ctrl->handler,
  					     struct ov5645, ctrls);
  	int ret;
  
  	mutex_lock(&ov5645->power_lock);
  	if (!ov5645->power_count) {
  		mutex_unlock(&ov5645->power_lock);
  		return 0;
  	}
  
  	switch (ctrl->id) {
  	case V4L2_CID_SATURATION:
  		ret = ov5645_set_saturation(ov5645, ctrl->val);
  		break;
  	case V4L2_CID_AUTO_WHITE_BALANCE:
  		ret = ov5645_set_awb(ov5645, ctrl->val);
  		break;
  	case V4L2_CID_AUTOGAIN:
  		ret = ov5645_set_agc_mode(ov5645, ctrl->val);
  		break;
  	case V4L2_CID_EXPOSURE_AUTO:
  		ret = ov5645_set_aec_mode(ov5645, ctrl->val);
  		break;
  	case V4L2_CID_TEST_PATTERN:
  		ret = ov5645_set_test_pattern(ov5645, ctrl->val);
  		break;
  	case V4L2_CID_HFLIP:
  		ret = ov5645_set_hflip(ov5645, ctrl->val);
  		break;
  	case V4L2_CID_VFLIP:
  		ret = ov5645_set_vflip(ov5645, ctrl->val);
  		break;
  	default:
  		ret = -EINVAL;
  		break;
  	}
  
  	mutex_unlock(&ov5645->power_lock);
  
  	return ret;
  }
  
  static struct v4l2_ctrl_ops ov5645_ctrl_ops = {
  	.s_ctrl = ov5645_s_ctrl,
  };
  
  static int ov5645_enum_mbus_code(struct v4l2_subdev *sd,
  				 struct v4l2_subdev_pad_config *cfg,
  				 struct v4l2_subdev_mbus_code_enum *code)
  {
  	if (code->index > 0)
  		return -EINVAL;
  
  	code->code = MEDIA_BUS_FMT_UYVY8_2X8;
  
  	return 0;
  }
  
  static int ov5645_enum_frame_size(struct v4l2_subdev *subdev,
  				  struct v4l2_subdev_pad_config *cfg,
  				  struct v4l2_subdev_frame_size_enum *fse)
  {
  	if (fse->code != MEDIA_BUS_FMT_UYVY8_2X8)
  		return -EINVAL;
  
  	if (fse->index >= ARRAY_SIZE(ov5645_mode_info_data))
  		return -EINVAL;
  
  	fse->min_width = ov5645_mode_info_data[fse->index].width;
  	fse->max_width = ov5645_mode_info_data[fse->index].width;
  	fse->min_height = ov5645_mode_info_data[fse->index].height;
  	fse->max_height = ov5645_mode_info_data[fse->index].height;
  
  	return 0;
  }
  
  static struct v4l2_mbus_framefmt *
  __ov5645_get_pad_format(struct ov5645 *ov5645,
  			struct v4l2_subdev_pad_config *cfg,
  			unsigned int pad,
  			enum v4l2_subdev_format_whence which)
  {
  	switch (which) {
  	case V4L2_SUBDEV_FORMAT_TRY:
  		return v4l2_subdev_get_try_format(&ov5645->sd, cfg, pad);
  	case V4L2_SUBDEV_FORMAT_ACTIVE:
  		return &ov5645->fmt;
  	default:
  		return NULL;
  	}
  }
  
  static int ov5645_get_format(struct v4l2_subdev *sd,
  			     struct v4l2_subdev_pad_config *cfg,
  			     struct v4l2_subdev_format *format)
  {
  	struct ov5645 *ov5645 = to_ov5645(sd);
  
  	format->format = *__ov5645_get_pad_format(ov5645, cfg, format->pad,
  						  format->which);
  	return 0;
  }
  
  static struct v4l2_rect *
  __ov5645_get_pad_crop(struct ov5645 *ov5645, struct v4l2_subdev_pad_config *cfg,
  		      unsigned int pad, enum v4l2_subdev_format_whence which)
  {
  	switch (which) {
  	case V4L2_SUBDEV_FORMAT_TRY:
  		return v4l2_subdev_get_try_crop(&ov5645->sd, cfg, pad);
  	case V4L2_SUBDEV_FORMAT_ACTIVE:
  		return &ov5645->crop;
  	default:
  		return NULL;
  	}
  }
  
  static const struct ov5645_mode_info *
  ov5645_find_nearest_mode(unsigned int width, unsigned int height)
  {
  	int i;
  
  	for (i = ARRAY_SIZE(ov5645_mode_info_data) - 1; i >= 0; i--) {
  		if (ov5645_mode_info_data[i].width <= width &&
  		    ov5645_mode_info_data[i].height <= height)
  			break;
  	}
  
  	if (i < 0)
  		i = 0;
  
  	return &ov5645_mode_info_data[i];
  }
  
  static int ov5645_set_format(struct v4l2_subdev *sd,
  			     struct v4l2_subdev_pad_config *cfg,
  			     struct v4l2_subdev_format *format)
  {
  	struct ov5645 *ov5645 = to_ov5645(sd);
  	struct v4l2_mbus_framefmt *__format;
  	struct v4l2_rect *__crop;
  	const struct ov5645_mode_info *new_mode;
  
  	__crop = __ov5645_get_pad_crop(ov5645, cfg, format->pad,
  			format->which);
  
  	new_mode = ov5645_find_nearest_mode(format->format.width,
  					    format->format.height);
  	__crop->width = new_mode->width;
  	__crop->height = new_mode->height;
  
  	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
  		ov5645->current_mode = new_mode;
  
  	__format = __ov5645_get_pad_format(ov5645, cfg, format->pad,
  			format->which);
  	__format->width = __crop->width;
  	__format->height = __crop->height;
  	__format->code = MEDIA_BUS_FMT_UYVY8_2X8;
  	__format->field = V4L2_FIELD_NONE;
  	__format->colorspace = V4L2_COLORSPACE_SRGB;
  
  	format->format = *__format;
  
  	return 0;
  }
  
  static int ov5645_entity_init_cfg(struct v4l2_subdev *subdev,
  				  struct v4l2_subdev_pad_config *cfg)
  {
  	struct v4l2_subdev_format fmt = { 0 };
  
  	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
  	fmt.format.width = 1920;
  	fmt.format.height = 1080;
  
  	ov5645_set_format(subdev, cfg, &fmt);
  
  	return 0;
  }
  
  static int ov5645_get_selection(struct v4l2_subdev *sd,
  			   struct v4l2_subdev_pad_config *cfg,
  			   struct v4l2_subdev_selection *sel)
  {
  	struct ov5645 *ov5645 = to_ov5645(sd);
  
  	if (sel->target != V4L2_SEL_TGT_CROP)
  		return -EINVAL;
  
  	sel->r = *__ov5645_get_pad_crop(ov5645, cfg, sel->pad,
  					sel->which);
  	return 0;
  }
  
  static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
  {
  	struct ov5645 *ov5645 = to_ov5645(subdev);
  	int ret;
  
  	if (enable) {
  		ret = ov5645_set_register_array(ov5645,
  					ov5645->current_mode->data,
  					ov5645->current_mode->data_size);
  		if (ret < 0) {
  			dev_err(ov5645->dev, "could not set mode %dx%d\n",
  				ov5645->current_mode->width,
  				ov5645->current_mode->height);
  			return ret;
  		}
  		ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
  		if (ret < 0) {
  			dev_err(ov5645->dev, "could not sync v4l2 controls\n");
  			return ret;
  		}
  		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
  				       OV5645_SYSTEM_CTRL0_START);
  		if (ret < 0)
  			return ret;
  	} else {
  		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
  				       OV5645_SYSTEM_CTRL0_STOP);
  		if (ret < 0)
  			return ret;
  	}
  
  	return 0;
  }
  
  static const struct v4l2_subdev_core_ops ov5645_core_ops = {
  	.s_power = ov5645_s_power,
  };
  
  static const struct v4l2_subdev_video_ops ov5645_video_ops = {
  	.s_stream = ov5645_s_stream,
  };
  
  static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
  	.init_cfg = ov5645_entity_init_cfg,
  	.enum_mbus_code = ov5645_enum_mbus_code,
  	.enum_frame_size = ov5645_enum_frame_size,
  	.get_fmt = ov5645_get_format,
  	.set_fmt = ov5645_set_format,
  	.get_selection = ov5645_get_selection,
  };
  
  static const struct v4l2_subdev_ops ov5645_subdev_ops = {
  	.core = &ov5645_core_ops,
  	.video = &ov5645_video_ops,
  	.pad = &ov5645_subdev_pad_ops,
  };
  
  static int ov5645_probe(struct i2c_client *client,
  			const struct i2c_device_id *id)
  {
  	struct device *dev = &client->dev;
  	struct device_node *endpoint;
  	struct ov5645 *ov5645;
  	u8 chip_id_high, chip_id_low;
  	u32 xclk_freq;
  	int ret;
  
  	ov5645 = devm_kzalloc(dev, sizeof(struct ov5645), GFP_KERNEL);
  	if (!ov5645)
  		return -ENOMEM;
  
  	ov5645->i2c_client = client;
  	ov5645->dev = dev;
  
  	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
  	if (!endpoint) {
  		dev_err(dev, "endpoint node not found\n");
  		return -EINVAL;
  	}
  
  	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint),
  					 &ov5645->ep);
  	if (ret < 0) {
  		dev_err(dev, "parsing endpoint node failed\n");
  		return ret;
  	}
  
  	of_node_put(endpoint);
  
  	if (ov5645->ep.bus_type != V4L2_MBUS_CSI2) {
  		dev_err(dev, "invalid bus type, must be CSI2\n");
  		return -EINVAL;
  	}
  
  	/* get system clock (xclk) */
  	ov5645->xclk = devm_clk_get(dev, "xclk");
  	if (IS_ERR(ov5645->xclk)) {
  		dev_err(dev, "could not get xclk");
  		return PTR_ERR(ov5645->xclk);
  	}
  
  	ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);
  	if (ret) {
  		dev_err(dev, "could not get xclk frequency\n");
  		return ret;
  	}
  
  	if (xclk_freq != 23880000) {
  		dev_err(dev, "external clock frequency %u is not supported\n",
  			xclk_freq);
  		return -EINVAL;
  	}
  
  	ret = clk_set_rate(ov5645->xclk, xclk_freq);
  	if (ret) {
  		dev_err(dev, "could not set xclk frequency\n");
  		return ret;
  	}
  
  	ov5645->io_regulator = devm_regulator_get(dev, "vdddo");
  	if (IS_ERR(ov5645->io_regulator)) {
  		dev_err(dev, "cannot get io regulator\n");
  		return PTR_ERR(ov5645->io_regulator);
  	}
  
  	ret = regulator_set_voltage(ov5645->io_regulator,
  				    OV5645_VOLTAGE_DIGITAL_IO,
  				    OV5645_VOLTAGE_DIGITAL_IO);
  	if (ret < 0) {
  		dev_err(dev, "cannot set io voltage\n");
  		return ret;
  	}
  
  	ov5645->core_regulator = devm_regulator_get(dev, "vddd");
  	if (IS_ERR(ov5645->core_regulator)) {
  		dev_err(dev, "cannot get core regulator\n");
  		return PTR_ERR(ov5645->core_regulator);
  	}
  
  	ret = regulator_set_voltage(ov5645->core_regulator,
  				    OV5645_VOLTAGE_DIGITAL_CORE,
  				    OV5645_VOLTAGE_DIGITAL_CORE);
  	if (ret < 0) {
  		dev_err(dev, "cannot set core voltage\n");
  		return ret;
  	}
  
  	ov5645->analog_regulator = devm_regulator_get(dev, "vdda");
  	if (IS_ERR(ov5645->analog_regulator)) {
  		dev_err(dev, "cannot get analog regulator\n");
  		return PTR_ERR(ov5645->analog_regulator);
  	}
  
  	ret = regulator_set_voltage(ov5645->analog_regulator,
  				    OV5645_VOLTAGE_ANALOG,
  				    OV5645_VOLTAGE_ANALOG);
  	if (ret < 0) {
  		dev_err(dev, "cannot set analog voltage\n");
  		return ret;
  	}
  
  	ov5645->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
  	if (IS_ERR(ov5645->enable_gpio)) {
  		dev_err(dev, "cannot get enable gpio\n");
  		return PTR_ERR(ov5645->enable_gpio);
  	}
  
  	ov5645->rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
  	if (IS_ERR(ov5645->rst_gpio)) {
  		dev_err(dev, "cannot get reset gpio\n");
  		return PTR_ERR(ov5645->rst_gpio);
  	}
  
  	mutex_init(&ov5645->power_lock);
  
  	v4l2_ctrl_handler_init(&ov5645->ctrls, 7);
  	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
  			  V4L2_CID_SATURATION, -4, 4, 1, 0);
  	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
  			  V4L2_CID_HFLIP, 0, 1, 1, 0);
  	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
  			  V4L2_CID_VFLIP, 0, 1, 1, 0);
  	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
  			  V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
  	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
  			  V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
  	v4l2_ctrl_new_std_menu(&ov5645->ctrls, &ov5645_ctrl_ops,
  			       V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL,
  			       0, V4L2_EXPOSURE_AUTO);
  	v4l2_ctrl_new_std_menu_items(&ov5645->ctrls, &ov5645_ctrl_ops,
  				     V4L2_CID_TEST_PATTERN,
  				     ARRAY_SIZE(ov5645_test_pattern_menu) - 1,
  				     0, 0, ov5645_test_pattern_menu);
  
  	ov5645->sd.ctrl_handler = &ov5645->ctrls;
  
  	if (ov5645->ctrls.error) {
  		dev_err(dev, "%s: control initialization error %d\n",
  		       __func__, ov5645->ctrls.error);
  		ret = ov5645->ctrls.error;
  		goto free_ctrl;
  	}
  
  	v4l2_i2c_subdev_init(&ov5645->sd, client, &ov5645_subdev_ops);
  	ov5645->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
  	ov5645->pad.flags = MEDIA_PAD_FL_SOURCE;
  	ov5645->sd.dev = &client->dev;
  
  	ret = media_entity_pads_init(&ov5645->sd.entity, 1, &ov5645->pad);
  	if (ret < 0) {
  		dev_err(dev, "could not register media entity\n");
  		goto free_ctrl;
  	}
  
  	ret = ov5645_s_power(&ov5645->sd, true);
  	if (ret < 0) {
  		dev_err(dev, "could not power up OV5645\n");
  		goto free_entity;
  	}
  
  	ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
  	if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
  		dev_err(dev, "could not read ID high\n");
  		ret = -ENODEV;
  		goto power_down;
  	}
  	ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_LOW, &chip_id_low);
  	if (ret < 0 || chip_id_low != OV5645_CHIP_ID_LOW_BYTE) {
  		dev_err(dev, "could not read ID low\n");
  		ret = -ENODEV;
  		goto power_down;
  	}
  
  	dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);
  
  	ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
  			      &ov5645->aec_pk_manual);
  	if (ret < 0) {
  		dev_err(dev, "could not read AEC/AGC mode\n");
  		ret = -ENODEV;
  		goto power_down;
  	}
  
  	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
  			      &ov5645->timing_tc_reg20);
  	if (ret < 0) {
  		dev_err(dev, "could not read vflip value\n");
  		ret = -ENODEV;
  		goto power_down;
  	}
  
  	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
  			      &ov5645->timing_tc_reg21);
  	if (ret < 0) {
  		dev_err(dev, "could not read hflip value\n");
  		ret = -ENODEV;
  		goto power_down;
  	}
  
  	ov5645_s_power(&ov5645->sd, false);
  
  	ret = v4l2_async_register_subdev(&ov5645->sd);
  	if (ret < 0) {
  		dev_err(dev, "could not register v4l2 device\n");
  		goto free_entity;
  	}
  
  	ov5645_entity_init_cfg(&ov5645->sd, NULL);
  
  	return 0;
  
  power_down:
  	ov5645_s_power(&ov5645->sd, false);
  free_entity:
  	media_entity_cleanup(&ov5645->sd.entity);
  free_ctrl:
  	v4l2_ctrl_handler_free(&ov5645->ctrls);
  	mutex_destroy(&ov5645->power_lock);
  
  	return ret;
  }
  
  static int ov5645_remove(struct i2c_client *client)
  {
  	struct v4l2_subdev *sd = i2c_get_clientdata(client);
  	struct ov5645 *ov5645 = to_ov5645(sd);
  
  	v4l2_async_unregister_subdev(&ov5645->sd);
  	media_entity_cleanup(&ov5645->sd.entity);
  	v4l2_ctrl_handler_free(&ov5645->ctrls);
  	mutex_destroy(&ov5645->power_lock);
  
  	return 0;
  }
  
  static const struct i2c_device_id ov5645_id[] = {
  	{ "ov5645", 0 },
  	{}
  };
  MODULE_DEVICE_TABLE(i2c, ov5645_id);
  
  static const struct of_device_id ov5645_of_match[] = {
  	{ .compatible = "ovti,ov5645" },
  	{ /* sentinel */ }
  };
  MODULE_DEVICE_TABLE(of, ov5645_of_match);
  
  static struct i2c_driver ov5645_i2c_driver = {
  	.driver = {
  		.of_match_table = of_match_ptr(ov5645_of_match),
  		.name  = "ov5645",
  	},
  	.probe  = ov5645_probe,
  	.remove = ov5645_remove,
  	.id_table = ov5645_id,
  };
  
  module_i2c_driver(ov5645_i2c_driver);
  
  MODULE_DESCRIPTION("Omnivision OV5645 Camera Driver");
  MODULE_AUTHOR("Todor Tomov <todor.tomov@linaro.org>");
  MODULE_LICENSE("GPL v2");
  