/*
   * Driver for SiliconFile NOON010PC30 CIF (1/11") Image Sensor with ISP
   *
   * Copyright (C) 2010 - 2011 Samsung Electronics Co., Ltd.
   * Contact: Sylwester Nawrocki, <s.nawrocki@samsung.com>
   *
   * Initial register configuration based on a driver authored by
   * HeungJun Kim <riverful.kim@samsung.com>.
   *
   * 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.
   */
  
  #include <linux/delay.h>
  #include <linux/gpio.h>
  #include <linux/i2c.h>
  #include <linux/slab.h>
  #include <linux/regulator/consumer.h>
  #include <media/noon010pc30.h>
  #include <linux/videodev2.h>
  #include <linux/module.h>
  #include <media/v4l2-ctrls.h>
  #include <media/v4l2-device.h>
  #include <media/v4l2-mediabus.h>
  #include <media/v4l2-subdev.h>
  
  static int debug;
  module_param(debug, int, 0644);
  MODULE_PARM_DESC(debug, "Enable module debug trace. Set to 1 to enable.");
  
  #define MODULE_NAME		"NOON010PC30"
  
  /*
   * Register offsets within a page
   * b15..b8 - page id, b7..b0 - register address
   */
  #define POWER_CTRL_REG		0x0001
  #define PAGEMODE_REG		0x03
  #define DEVICE_ID_REG		0x0004
  #define NOON010PC30_ID		0x86
  #define VDO_CTL_REG(n)		(0x0010 + (n))
  #define SYNC_CTL_REG		0x0012
  /* Window size and position */
  #define WIN_ROWH_REG		0x0013
  #define WIN_ROWL_REG		0x0014
  #define WIN_COLH_REG		0x0015
  #define WIN_COLL_REG		0x0016
  #define WIN_HEIGHTH_REG		0x0017
  #define WIN_HEIGHTL_REG		0x0018
  #define WIN_WIDTHH_REG		0x0019
  #define WIN_WIDTHL_REG		0x001A
  #define HBLANKH_REG		0x001B
  #define HBLANKL_REG		0x001C
  #define VSYNCH_REG		0x001D
  #define VSYNCL_REG		0x001E
  /* VSYNC control */
  #define VS_CTL_REG(n)		(0x00A1 + (n))
  /* page 1 */
  #define ISP_CTL_REG(n)		(0x0110 + (n))
  #define YOFS_REG		0x0119
  #define DARK_YOFS_REG		0x011A
  #define SAT_CTL_REG		0x0120
  #define BSAT_REG		0x0121
  #define RSAT_REG		0x0122
  /* Color correction */
  #define CMC_CTL_REG		0x0130
  #define CMC_OFSGH_REG		0x0133
  #define CMC_OFSGL_REG		0x0135
  #define CMC_SIGN_REG		0x0136
  #define CMC_GOFS_REG		0x0137
  #define CMC_COEF_REG(n)		(0x0138 + (n))
  #define CMC_OFS_REG(n)		(0x0141 + (n))
  /* Gamma correction */
  #define GMA_CTL_REG		0x0160
  #define GMA_COEF_REG(n)		(0x0161 + (n))
  /* Lens Shading */
  #define LENS_CTRL_REG		0x01D0
  #define LENS_XCEN_REG		0x01D1
  #define LENS_YCEN_REG		0x01D2
  #define LENS_RC_REG		0x01D3
  #define LENS_GC_REG		0x01D4
  #define LENS_BC_REG		0x01D5
  #define L_AGON_REG		0x01D6
  #define L_AGOFF_REG		0x01D7
  /* Page 3 - Auto Exposure */
  #define AE_CTL_REG(n)		(0x0310 + (n))
  #define AE_CTL9_REG		0x032C
  #define AE_CTL10_REG		0x032D
  #define AE_YLVL_REG		0x031C
  #define AE_YTH_REG(n)		(0x031D + (n))
  #define AE_WGT_REG		0x0326
  #define EXP_TIMEH_REG		0x0333
  #define EXP_TIMEM_REG		0x0334
  #define EXP_TIMEL_REG		0x0335
  #define EXP_MMINH_REG		0x0336
  #define EXP_MMINL_REG		0x0337
  #define EXP_MMAXH_REG		0x0338
  #define EXP_MMAXM_REG		0x0339
  #define EXP_MMAXL_REG		0x033A
  /* Page 4 - Auto White Balance */
  #define AWB_CTL_REG(n)		(0x0410 + (n))
  #define AWB_ENABE		0x80
  #define AWB_WGHT_REG		0x0419
  #define BGAIN_PAR_REG(n)	(0x044F + (n))
  /* Manual white balance, when AWB_CTL2[0]=1 */
  #define MWB_RGAIN_REG		0x0466
  #define MWB_BGAIN_REG		0x0467
  
  /* The token to mark an array end */
  #define REG_TERM		0xFFFF
  
  struct noon010_format {
  	u32 code;
  	enum v4l2_colorspace colorspace;
  	u16 ispctl1_reg;
  };
  
  struct noon010_frmsize {
  	u16 width;
  	u16 height;
  	int vid_ctl1;
  };
  
  static const char * const noon010_supply_name[] = {
  	"vdd_core", "vddio", "vdda"
  };
  
  #define NOON010_NUM_SUPPLIES ARRAY_SIZE(noon010_supply_name)
  
  struct noon010_info {
  	struct v4l2_subdev sd;
  	struct media_pad pad;
  	struct v4l2_ctrl_handler hdl;
  	struct regulator_bulk_data supply[NOON010_NUM_SUPPLIES];
  	u32 gpio_nreset;
  	u32 gpio_nstby;
  
  	/* Protects the struct members below */
  	struct mutex lock;
  
  	const struct noon010_format *curr_fmt;
  	const struct noon010_frmsize *curr_win;
  	unsigned int apply_new_cfg:1;
  	unsigned int streaming:1;
  	unsigned int hflip:1;
  	unsigned int vflip:1;
  	unsigned int power:1;
  	u8 i2c_reg_page;
  };
  
  struct i2c_regval {
  	u16 addr;
  	u16 val;
  };
  
  /* Supported resolutions. */
  static const struct noon010_frmsize noon010_sizes[] = {
  	{
  		.width		= 352,
  		.height		= 288,
  		.vid_ctl1	= 0,
  	}, {
  		.width		= 176,
  		.height		= 144,
  		.vid_ctl1	= 0x10,
  	}, {
  		.width		= 88,
  		.height		= 72,
  		.vid_ctl1	= 0x20,
  	},
  };
  
  /* Supported pixel formats. */
  static const struct noon010_format noon010_formats[] = {
  	{
  		.code		= MEDIA_BUS_FMT_YUYV8_2X8,
  		.colorspace	= V4L2_COLORSPACE_JPEG,
  		.ispctl1_reg	= 0x03,
  	}, {
  		.code		= MEDIA_BUS_FMT_YVYU8_2X8,
  		.colorspace	= V4L2_COLORSPACE_JPEG,
  		.ispctl1_reg	= 0x02,
  	}, {
  		.code		= MEDIA_BUS_FMT_VYUY8_2X8,
  		.colorspace	= V4L2_COLORSPACE_JPEG,
  		.ispctl1_reg	= 0,
  	}, {
  		.code		= MEDIA_BUS_FMT_UYVY8_2X8,
  		.colorspace	= V4L2_COLORSPACE_JPEG,
  		.ispctl1_reg	= 0x01,
  	}, {
  		.code		= MEDIA_BUS_FMT_RGB565_2X8_BE,
  		.colorspace	= V4L2_COLORSPACE_JPEG,
  		.ispctl1_reg	= 0x40,
  	},
  };
  
  static const struct i2c_regval noon010_base_regs[] = {
  	{ WIN_COLL_REG,		0x06 },	{ HBLANKL_REG,		0x7C },
  	/* Color corection and saturation */
  	{ ISP_CTL_REG(0),	0x30 }, { ISP_CTL_REG(2),	0x30 },
  	{ YOFS_REG,		0x80 }, { DARK_YOFS_REG,	0x04 },
  	{ SAT_CTL_REG,		0x1F }, { BSAT_REG,		0x90 },
  	{ CMC_CTL_REG,		0x0F }, { CMC_OFSGH_REG,	0x3C },
  	{ CMC_OFSGL_REG,	0x2C }, { CMC_SIGN_REG,		0x3F },
  	{ CMC_COEF_REG(0),	0x79 }, { CMC_OFS_REG(0),	0x00 },
  	{ CMC_COEF_REG(1),	0x39 }, { CMC_OFS_REG(1),	0x00 },
  	{ CMC_COEF_REG(2),	0x00 }, { CMC_OFS_REG(2),	0x00 },
  	{ CMC_COEF_REG(3),	0x11 }, { CMC_OFS_REG(3),	0x8B },
  	{ CMC_COEF_REG(4),	0x65 }, { CMC_OFS_REG(4),	0x07 },
  	{ CMC_COEF_REG(5),	0x14 }, { CMC_OFS_REG(5),	0x04 },
  	{ CMC_COEF_REG(6),	0x01 }, { CMC_OFS_REG(6),	0x9C },
  	{ CMC_COEF_REG(7),	0x33 }, { CMC_OFS_REG(7),	0x89 },
  	{ CMC_COEF_REG(8),	0x74 }, { CMC_OFS_REG(8),	0x25 },
  	/* Automatic white balance */
  	{ AWB_CTL_REG(0),	0x78 }, { AWB_CTL_REG(1),	0x2E },
  	{ AWB_CTL_REG(2),	0x20 }, { AWB_CTL_REG(3),	0x85 },
  	/* Auto exposure */
  	{ AE_CTL_REG(0),	0xDC }, { AE_CTL_REG(1),	0x81 },
  	{ AE_CTL_REG(2),	0x30 }, { AE_CTL_REG(3),	0xA5 },
  	{ AE_CTL_REG(4),	0x40 }, { AE_CTL_REG(5),	0x51 },
  	{ AE_CTL_REG(6),	0x33 }, { AE_CTL_REG(7),	0x7E },
  	{ AE_CTL9_REG,		0x00 }, { AE_CTL10_REG,		0x02 },
  	{ AE_YLVL_REG,		0x44 },	{ AE_YTH_REG(0),	0x34 },
  	{ AE_YTH_REG(1),	0x30 },	{ AE_WGT_REG,		0xD5 },
  	/* Lens shading compensation */
  	{ LENS_CTRL_REG,	0x01 }, { LENS_XCEN_REG,	0x80 },
  	{ LENS_YCEN_REG,	0x70 }, { LENS_RC_REG,		0x53 },
  	{ LENS_GC_REG,		0x40 }, { LENS_BC_REG,		0x3E },
  	{ REG_TERM,		0 },
  };
  
  static inline struct noon010_info *to_noon010(struct v4l2_subdev *sd)
  {
  	return container_of(sd, struct noon010_info, sd);
  }
  
  static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  {
  	return &container_of(ctrl->handler, struct noon010_info, hdl)->sd;
  }
  
  static inline int set_i2c_page(struct noon010_info *info,
  			       struct i2c_client *client, unsigned int reg)
  {
  	u32 page = reg >> 8 & 0xFF;
  	int ret = 0;
  
  	if (info->i2c_reg_page != page && (reg & 0xFF) != 0x03) {
  		ret = i2c_smbus_write_byte_data(client, PAGEMODE_REG, page);
  		if (!ret)
  			info->i2c_reg_page = page;
  	}
  	return ret;
  }
  
  static int cam_i2c_read(struct v4l2_subdev *sd, u32 reg_addr)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  	struct noon010_info *info = to_noon010(sd);
  	int ret = set_i2c_page(info, client, reg_addr);
  
  	if (ret)
  		return ret;
  	return i2c_smbus_read_byte_data(client, reg_addr & 0xFF);
  }
  
  static int cam_i2c_write(struct v4l2_subdev *sd, u32 reg_addr, u32 val)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(sd);
  	struct noon010_info *info = to_noon010(sd);
  	int ret = set_i2c_page(info, client, reg_addr);
  
  	if (ret)
  		return ret;
  	return i2c_smbus_write_byte_data(client, reg_addr & 0xFF, val);
  }
  
  static inline int noon010_bulk_write_reg(struct v4l2_subdev *sd,
  					 const struct i2c_regval *msg)
  {
  	while (msg->addr != REG_TERM) {
  		int ret = cam_i2c_write(sd, msg->addr, msg->val);
  
  		if (ret)
  			return ret;
  		msg++;
  	}
  	return 0;
  }
  
  /* Device reset and sleep mode control */
  static int noon010_power_ctrl(struct v4l2_subdev *sd, bool reset, bool sleep)
  {
  	struct noon010_info *info = to_noon010(sd);
  	u8 reg = sleep ? 0xF1 : 0xF0;
  	int ret = 0;
  
  	if (reset) {
  		ret = cam_i2c_write(sd, POWER_CTRL_REG, reg | 0x02);
  		udelay(20);
  	}
  	if (!ret) {
  		ret = cam_i2c_write(sd, POWER_CTRL_REG, reg);
  		if (reset && !ret)
  			info->i2c_reg_page = -1;
  	}
  	return ret;
  }
  
  /* Automatic white balance control */
  static int noon010_enable_autowhitebalance(struct v4l2_subdev *sd, int on)
  {
  	int ret;
  
  	ret = cam_i2c_write(sd, AWB_CTL_REG(1), on ? 0x2E : 0x2F);
  	if (!ret)
  		ret = cam_i2c_write(sd, AWB_CTL_REG(0), on ? 0xFB : 0x7B);
  	return ret;
  }
  
  /* Called with struct noon010_info.lock mutex held */
  static int noon010_set_flip(struct v4l2_subdev *sd, int hflip, int vflip)
  {
  	struct noon010_info *info = to_noon010(sd);
  	int reg, ret;
  
  	reg = cam_i2c_read(sd, VDO_CTL_REG(1));
  	if (reg < 0)
  		return reg;
  
  	reg &= 0x7C;
  	if (hflip)
  		reg |= 0x01;
  	if (vflip)
  		reg |= 0x02;
  
  	ret = cam_i2c_write(sd, VDO_CTL_REG(1), reg | 0x80);
  	if (!ret) {
  		info->hflip = hflip;
  		info->vflip = vflip;
  	}
  	return ret;
  }
  
  /* Configure resolution and color format */
  static int noon010_set_params(struct v4l2_subdev *sd)
  {
  	struct noon010_info *info = to_noon010(sd);
  
  	int ret = cam_i2c_write(sd, VDO_CTL_REG(0),
  				info->curr_win->vid_ctl1);
  	if (ret)
  		return ret;
  	return cam_i2c_write(sd, ISP_CTL_REG(0),
  			     info->curr_fmt->ispctl1_reg);
  }
  
  /* Find nearest matching image pixel size. */
  static int noon010_try_frame_size(struct v4l2_mbus_framefmt *mf,
  				  const struct noon010_frmsize **size)
  {
  	unsigned int min_err = ~0;
  	int i = ARRAY_SIZE(noon010_sizes);
  	const struct noon010_frmsize *fsize = &noon010_sizes[0],
  		*match = NULL;
  
  	while (i--) {
  		int err = abs(fsize->width - mf->width)
  				+ abs(fsize->height - mf->height);
  
  		if (err < min_err) {
  			min_err = err;
  			match = fsize;
  		}
  		fsize++;
  	}
  	if (match) {
  		mf->width  = match->width;
  		mf->height = match->height;
  		if (size)
  			*size = match;
  		return 0;
  	}
  	return -EINVAL;
  }
  
  /* Called with info.lock mutex held */
  static int power_enable(struct noon010_info *info)
  {
  	int ret;
  
  	if (info->power) {
  		v4l2_info(&info->sd, "%s: sensor is already on
  ", __func__);
  		return 0;
  	}
  
  	if (gpio_is_valid(info->gpio_nstby))
  		gpio_set_value(info->gpio_nstby, 0);
  
  	if (gpio_is_valid(info->gpio_nreset))
  		gpio_set_value(info->gpio_nreset, 0);
  
  	ret = regulator_bulk_enable(NOON010_NUM_SUPPLIES, info->supply);
  	if (ret)
  		return ret;
  
  	if (gpio_is_valid(info->gpio_nreset)) {
  		msleep(50);
  		gpio_set_value(info->gpio_nreset, 1);
  	}
  	if (gpio_is_valid(info->gpio_nstby)) {
  		udelay(1000);
  		gpio_set_value(info->gpio_nstby, 1);
  	}
  	if (gpio_is_valid(info->gpio_nreset)) {
  		udelay(1000);
  		gpio_set_value(info->gpio_nreset, 0);
  		msleep(100);
  		gpio_set_value(info->gpio_nreset, 1);
  		msleep(20);
  	}
  	info->power = 1;
  
  	v4l2_dbg(1, debug, &info->sd,  "%s: sensor is on
  ", __func__);
  	return 0;
  }
  
  /* Called with info.lock mutex held */
  static int power_disable(struct noon010_info *info)
  {
  	int ret;
  
  	if (!info->power) {
  		v4l2_info(&info->sd, "%s: sensor is already off
  ", __func__);
  		return 0;
  	}
  
  	ret = regulator_bulk_disable(NOON010_NUM_SUPPLIES, info->supply);
  	if (ret)
  		return ret;
  
  	if (gpio_is_valid(info->gpio_nstby))
  		gpio_set_value(info->gpio_nstby, 0);
  
  	if (gpio_is_valid(info->gpio_nreset))
  		gpio_set_value(info->gpio_nreset, 0);
  
  	info->power = 0;
  
  	v4l2_dbg(1, debug, &info->sd,  "%s: sensor is off
  ", __func__);
  
  	return 0;
  }
  
  static int noon010_s_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct v4l2_subdev *sd = to_sd(ctrl);
  	struct noon010_info *info = to_noon010(sd);
  	int ret = 0;
  
  	v4l2_dbg(1, debug, sd, "%s: ctrl_id: %d, value: %d
  ",
  		 __func__, ctrl->id, ctrl->val);
  
  	mutex_lock(&info->lock);
  	/*
  	 * If the device is not powered up by the host driver do
  	 * not apply any controls to H/W at this time. Instead
  	 * the controls will be restored right after power-up.
  	 */
  	if (!info->power)
  		goto unlock;
  
  	switch (ctrl->id) {
  	case V4L2_CID_AUTO_WHITE_BALANCE:
  		ret = noon010_enable_autowhitebalance(sd, ctrl->val);
  		break;
  	case V4L2_CID_BLUE_BALANCE:
  		ret = cam_i2c_write(sd, MWB_BGAIN_REG, ctrl->val);
  		break;
  	case V4L2_CID_RED_BALANCE:
  		ret =  cam_i2c_write(sd, MWB_RGAIN_REG, ctrl->val);
  		break;
  	default:
  		ret = -EINVAL;
  	}
  unlock:
  	mutex_unlock(&info->lock);
  	return ret;
  }
  
  static int noon010_enum_mbus_code(struct v4l2_subdev *sd,
  				  struct v4l2_subdev_pad_config *cfg,
  				  struct v4l2_subdev_mbus_code_enum *code)
  {
  	if (code->index >= ARRAY_SIZE(noon010_formats))
  		return -EINVAL;
  
  	code->code = noon010_formats[code->index].code;
  	return 0;
  }
  
  static int noon010_get_fmt(struct v4l2_subdev *sd,
  			   struct v4l2_subdev_pad_config *cfg,
  			   struct v4l2_subdev_format *fmt)
  {
  	struct noon010_info *info = to_noon010(sd);
  	struct v4l2_mbus_framefmt *mf;
  
  	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
  		if (cfg) {
  			mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  			fmt->format = *mf;
  		}
  		return 0;
  	}
  	mf = &fmt->format;
  
  	mutex_lock(&info->lock);
  	mf->width = info->curr_win->width;
  	mf->height = info->curr_win->height;
  	mf->code = info->curr_fmt->code;
  	mf->colorspace = info->curr_fmt->colorspace;
  	mf->field = V4L2_FIELD_NONE;
  
  	mutex_unlock(&info->lock);
  	return 0;
  }
  
  /* Return nearest media bus frame format. */
  static const struct noon010_format *noon010_try_fmt(struct v4l2_subdev *sd,
  					    struct v4l2_mbus_framefmt *mf)
  {
  	int i = ARRAY_SIZE(noon010_formats);
  
  	while (--i)
  		if (mf->code == noon010_formats[i].code)
  			break;
  	mf->code = noon010_formats[i].code;
  
  	return &noon010_formats[i];
  }
  
  static int noon010_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
  			   struct v4l2_subdev_format *fmt)
  {
  	struct noon010_info *info = to_noon010(sd);
  	const struct noon010_frmsize *size = NULL;
  	const struct noon010_format *nf;
  	struct v4l2_mbus_framefmt *mf;
  	int ret = 0;
  
  	nf = noon010_try_fmt(sd, &fmt->format);
  	noon010_try_frame_size(&fmt->format, &size);
  	fmt->format.colorspace = V4L2_COLORSPACE_JPEG;
  	fmt->format.field = V4L2_FIELD_NONE;
  
  	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
  		if (cfg) {
  			mf = v4l2_subdev_get_try_format(sd, cfg, 0);
  			*mf = fmt->format;
  		}
  		return 0;
  	}
  	mutex_lock(&info->lock);
  	if (!info->streaming) {
  		info->apply_new_cfg = 1;
  		info->curr_fmt = nf;
  		info->curr_win = size;
  	} else {
  		ret = -EBUSY;
  	}
  	mutex_unlock(&info->lock);
  	return ret;
  }
  
  /* Called with struct noon010_info.lock mutex held */
  static int noon010_base_config(struct v4l2_subdev *sd)
  {
  	int ret = noon010_bulk_write_reg(sd, noon010_base_regs);
  	if (!ret)
  		ret = noon010_set_params(sd);
  	if (!ret)
  		ret = noon010_set_flip(sd, 1, 0);
  
  	return ret;
  }
  
  static int noon010_s_power(struct v4l2_subdev *sd, int on)
  {
  	struct noon010_info *info = to_noon010(sd);
  	int ret;
  
  	mutex_lock(&info->lock);
  	if (on) {
  		ret = power_enable(info);
  		if (!ret)
  			ret = noon010_base_config(sd);
  	} else {
  		noon010_power_ctrl(sd, false, true);
  		ret = power_disable(info);
  	}
  	mutex_unlock(&info->lock);
  
  	/* Restore the controls state */
  	if (!ret && on)
  		ret = v4l2_ctrl_handler_setup(&info->hdl);
  
  	return ret;
  }
  
  static int noon010_s_stream(struct v4l2_subdev *sd, int on)
  {
  	struct noon010_info *info = to_noon010(sd);
  	int ret = 0;
  
  	mutex_lock(&info->lock);
  	if (!info->streaming != !on) {
  		ret = noon010_power_ctrl(sd, false, !on);
  		if (!ret)
  			info->streaming = on;
  	}
  	if (!ret && on && info->apply_new_cfg) {
  		ret = noon010_set_params(sd);
  		if (!ret)
  			info->apply_new_cfg = 0;
  	}
  	mutex_unlock(&info->lock);
  	return ret;
  }
  
  static int noon010_log_status(struct v4l2_subdev *sd)
  {
  	struct noon010_info *info = to_noon010(sd);
  
  	v4l2_ctrl_handler_log_status(&info->hdl, sd->name);
  	return 0;
  }
  
  static int noon010_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
  {
  	struct v4l2_mbus_framefmt *mf = v4l2_subdev_get_try_format(sd, fh->pad, 0);
  
  	mf->width = noon010_sizes[0].width;
  	mf->height = noon010_sizes[0].height;
  	mf->code = noon010_formats[0].code;
  	mf->colorspace = V4L2_COLORSPACE_JPEG;
  	mf->field = V4L2_FIELD_NONE;
  	return 0;
  }
  
  static const struct v4l2_subdev_internal_ops noon010_subdev_internal_ops = {
  	.open = noon010_open,
  };
  
  static const struct v4l2_ctrl_ops noon010_ctrl_ops = {
  	.s_ctrl = noon010_s_ctrl,
  };
  
  static const struct v4l2_subdev_core_ops noon010_core_ops = {
  	.s_power	= noon010_s_power,
  	.log_status	= noon010_log_status,
  };
  
  static struct v4l2_subdev_pad_ops noon010_pad_ops = {
  	.enum_mbus_code	= noon010_enum_mbus_code,
  	.get_fmt	= noon010_get_fmt,
  	.set_fmt	= noon010_set_fmt,
  };
  
  static struct v4l2_subdev_video_ops noon010_video_ops = {
  	.s_stream	= noon010_s_stream,
  };
  
  static const struct v4l2_subdev_ops noon010_ops = {
  	.core	= &noon010_core_ops,
  	.pad	= &noon010_pad_ops,
  	.video	= &noon010_video_ops,
  };
  
  /* Return 0 if NOON010PC30L sensor type was detected or -ENODEV otherwise. */
  static int noon010_detect(struct i2c_client *client, struct noon010_info *info)
  {
  	int ret;
  
  	ret = power_enable(info);
  	if (ret)
  		return ret;
  
  	ret = i2c_smbus_read_byte_data(client, DEVICE_ID_REG);
  	if (ret < 0)
  		dev_err(&client->dev, "I2C read failed: 0x%X
  ", ret);
  
  	power_disable(info);
  
  	return ret == NOON010PC30_ID ? 0 : -ENODEV;
  }
  
  static int noon010_probe(struct i2c_client *client,
  			 const struct i2c_device_id *id)
  {
  	struct noon010_info *info;
  	struct v4l2_subdev *sd;
  	const struct noon010pc30_platform_data *pdata
  		= client->dev.platform_data;
  	int ret;
  	int i;
  
  	if (!pdata) {
  		dev_err(&client->dev, "No platform data!
  ");
  		return -EIO;
  	}
  
  	info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
  	if (!info)
  		return -ENOMEM;
  
  	mutex_init(&info->lock);
  	sd = &info->sd;
  	v4l2_i2c_subdev_init(sd, client, &noon010_ops);
  	strlcpy(sd->name, MODULE_NAME, sizeof(sd->name));
  
  	sd->internal_ops = &noon010_subdev_internal_ops;
  	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
  
  	v4l2_ctrl_handler_init(&info->hdl, 3);
  
  	v4l2_ctrl_new_std(&info->hdl, &noon010_ctrl_ops,
  			  V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
  	v4l2_ctrl_new_std(&info->hdl, &noon010_ctrl_ops,
  			  V4L2_CID_RED_BALANCE, 0, 127, 1, 64);
  	v4l2_ctrl_new_std(&info->hdl, &noon010_ctrl_ops,
  			  V4L2_CID_BLUE_BALANCE, 0, 127, 1, 64);
  
  	sd->ctrl_handler = &info->hdl;
  
  	ret = info->hdl.error;
  	if (ret)
  		goto np_err;
  
  	info->i2c_reg_page	= -1;
  	info->gpio_nreset	= -EINVAL;
  	info->gpio_nstby	= -EINVAL;
  	info->curr_fmt		= &noon010_formats[0];
  	info->curr_win		= &noon010_sizes[0];
  
  	if (gpio_is_valid(pdata->gpio_nreset)) {
  		ret = devm_gpio_request_one(&client->dev, pdata->gpio_nreset,
  					    GPIOF_OUT_INIT_LOW,
  					    "NOON010PC30 NRST");
  		if (ret) {
  			dev_err(&client->dev, "GPIO request error: %d
  ", ret);
  			goto np_err;
  		}
  		info->gpio_nreset = pdata->gpio_nreset;
  		gpio_export(info->gpio_nreset, 0);
  	}
  
  	if (gpio_is_valid(pdata->gpio_nstby)) {
  		ret = devm_gpio_request_one(&client->dev, pdata->gpio_nstby,
  					    GPIOF_OUT_INIT_LOW,
  					    "NOON010PC30 NSTBY");
  		if (ret) {
  			dev_err(&client->dev, "GPIO request error: %d
  ", ret);
  			goto np_err;
  		}
  		info->gpio_nstby = pdata->gpio_nstby;
  		gpio_export(info->gpio_nstby, 0);
  	}
  
  	for (i = 0; i < NOON010_NUM_SUPPLIES; i++)
  		info->supply[i].supply = noon010_supply_name[i];
  
  	ret = devm_regulator_bulk_get(&client->dev, NOON010_NUM_SUPPLIES,
  				 info->supply);
  	if (ret)
  		goto np_err;
  
  	info->pad.flags = MEDIA_PAD_FL_SOURCE;
  	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_SENSOR;
  	ret = media_entity_init(&sd->entity, 1, &info->pad, 0);
  	if (ret < 0)
  		goto np_err;
  
  	ret = noon010_detect(client, info);
  	if (!ret)
  		return 0;
  
  np_err:
  	v4l2_ctrl_handler_free(&info->hdl);
  	v4l2_device_unregister_subdev(sd);
  	return ret;
  }
  
  static int noon010_remove(struct i2c_client *client)
  {
  	struct v4l2_subdev *sd = i2c_get_clientdata(client);
  	struct noon010_info *info = to_noon010(sd);
  
  	v4l2_device_unregister_subdev(sd);
  	v4l2_ctrl_handler_free(&info->hdl);
  	media_entity_cleanup(&sd->entity);
  
  	return 0;
  }
  
  static const struct i2c_device_id noon010_id[] = {
  	{ MODULE_NAME, 0 },
  	{ },
  };
  MODULE_DEVICE_TABLE(i2c, noon010_id);
  
  
  static struct i2c_driver noon010_i2c_driver = {
  	.driver = {
  		.name = MODULE_NAME
  	},
  	.probe		= noon010_probe,
  	.remove		= noon010_remove,
  	.id_table	= noon010_id,
  };
  
  module_i2c_driver(noon010_i2c_driver);
  
  MODULE_DESCRIPTION("Siliconfile NOON010PC30 camera driver");
  MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
  MODULE_LICENSE("GPL");