text: /*
   * drivers/media/i2c/smiapp/smiapp-core.c
   *
   * Generic driver for SMIA/SMIA++ compliant camera modules
   *
   * Copyright (C) 2010--2012 Nokia Corporation
   * Contact: Sakari Ailus <sakari.ailus@iki.fi>
   *
   * Based on smiapp driver by Vimarsh Zutshi
   * Based on jt8ev1.c by Vimarsh Zutshi
   * Based on smia-sensor.c by Tuukka Toivonen <tuukkat76@gmail.com>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * version 2 as published by the Free Software Foundation.
   *
   * 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/clk.h>
  #include <linux/delay.h>
  #include <linux/device.h>
  #include <linux/gpio.h>
  #include <linux/gpio/consumer.h>
  #include <linux/module.h>
  #include <linux/regulator/consumer.h>
  #include <linux/slab.h>
  #include <linux/smiapp.h>
  #include <linux/v4l2-mediabus.h>
  #include <media/v4l2-device.h>
  #include <media/v4l2-of.h>
  
  #include "smiapp.h"
  
  #define SMIAPP_ALIGN_DIM(dim, flags)	\
  	((flags) & V4L2_SEL_FLAG_GE	\
  	 ? ALIGN((dim), 2)		\
  	 : (dim) & ~1)
  
  /*
   * smiapp_module_idents - supported camera modules
   */
  static const struct smiapp_module_ident smiapp_module_idents[] = {
  	SMIAPP_IDENT_L(0x01, 0x022b, -1, "vs6555"),
  	SMIAPP_IDENT_L(0x01, 0x022e, -1, "vw6558"),
  	SMIAPP_IDENT_L(0x07, 0x7698, -1, "ovm7698"),
  	SMIAPP_IDENT_L(0x0b, 0x4242, -1, "smiapp-003"),
  	SMIAPP_IDENT_L(0x0c, 0x208a, -1, "tcm8330md"),
  	SMIAPP_IDENT_LQ(0x0c, 0x2134, -1, "tcm8500md", &smiapp_tcm8500md_quirk),
  	SMIAPP_IDENT_L(0x0c, 0x213e, -1, "et8en2"),
  	SMIAPP_IDENT_L(0x0c, 0x2184, -1, "tcm8580md"),
  	SMIAPP_IDENT_LQ(0x0c, 0x560f, -1, "jt8ew9", &smiapp_jt8ew9_quirk),
  	SMIAPP_IDENT_LQ(0x10, 0x4141, -1, "jt8ev1", &smiapp_jt8ev1_quirk),
  	SMIAPP_IDENT_LQ(0x10, 0x4241, -1, "imx125es", &smiapp_imx125es_quirk),
  };
  
  /*
   *
   * Dynamic Capability Identification
   *
   */
  
  static int smiapp_read_frame_fmt(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	u32 fmt_model_type, fmt_model_subtype, ncol_desc, nrow_desc;
  	unsigned int i;
  	int rval;
  	int line_count = 0;
  	int embedded_start = -1, embedded_end = -1;
  	int image_start = 0;
  
  	rval = smiapp_read(sensor, SMIAPP_REG_U8_FRAME_FORMAT_MODEL_TYPE,
  			   &fmt_model_type);
  	if (rval)
  		return rval;
  
  	rval = smiapp_read(sensor, SMIAPP_REG_U8_FRAME_FORMAT_MODEL_SUBTYPE,
  			   &fmt_model_subtype);
  	if (rval)
  		return rval;
  
  	ncol_desc = (fmt_model_subtype
  		     & SMIAPP_FRAME_FORMAT_MODEL_SUBTYPE_NCOLS_MASK)
  		>> SMIAPP_FRAME_FORMAT_MODEL_SUBTYPE_NCOLS_SHIFT;
  	nrow_desc = fmt_model_subtype
  		& SMIAPP_FRAME_FORMAT_MODEL_SUBTYPE_NROWS_MASK;
  
  	dev_dbg(&client->dev, "format_model_type %s\n",
  		fmt_model_type == SMIAPP_FRAME_FORMAT_MODEL_TYPE_2BYTE
  		? "2 byte" :
  		fmt_model_type == SMIAPP_FRAME_FORMAT_MODEL_TYPE_4BYTE
  		? "4 byte" : "is simply bad");
  
  	for (i = 0; i < ncol_desc + nrow_desc; i++) {
  		u32 desc;
  		u32 pixelcode;
  		u32 pixels;
  		char *which;
  		char *what;
  
  		if (fmt_model_type == SMIAPP_FRAME_FORMAT_MODEL_TYPE_2BYTE) {
  			rval = smiapp_read(
  				sensor,
  				SMIAPP_REG_U16_FRAME_FORMAT_DESCRIPTOR_2(i),
  				&desc);
  			if (rval)
  				return rval;
  
  			pixelcode =
  				(desc
  				 & SMIAPP_FRAME_FORMAT_DESC_2_PIXELCODE_MASK)
  				>> SMIAPP_FRAME_FORMAT_DESC_2_PIXELCODE_SHIFT;
  			pixels = desc & SMIAPP_FRAME_FORMAT_DESC_2_PIXELS_MASK;
  		} else if (fmt_model_type
  			   == SMIAPP_FRAME_FORMAT_MODEL_TYPE_4BYTE) {
  			rval = smiapp_read(
  				sensor,
  				SMIAPP_REG_U32_FRAME_FORMAT_DESCRIPTOR_4(i),
  				&desc);
  			if (rval)
  				return rval;
  
  			pixelcode =
  				(desc
  				 & SMIAPP_FRAME_FORMAT_DESC_4_PIXELCODE_MASK)
  				>> SMIAPP_FRAME_FORMAT_DESC_4_PIXELCODE_SHIFT;
  			pixels = desc & SMIAPP_FRAME_FORMAT_DESC_4_PIXELS_MASK;
  		} else {
  			dev_dbg(&client->dev,
  				"invalid frame format model type %d\n",
  				fmt_model_type);
  			return -EINVAL;
  		}
  
  		if (i < ncol_desc)
  			which = "columns";
  		else
  			which = "rows";
  
  		switch (pixelcode) {
  		case SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_EMBEDDED:
  			what = "embedded";
  			break;
  		case SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_DUMMY:
  			what = "dummy";
  			break;
  		case SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_BLACK:
  			what = "black";
  			break;
  		case SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_DARK:
  			what = "dark";
  			break;
  		case SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_VISIBLE:
  			what = "visible";
  			break;
  		default:
  			what = "invalid";
  			dev_dbg(&client->dev, "pixelcode %d\n", pixelcode);
  			break;
  		}
  
  		dev_dbg(&client->dev, "%s pixels: %d %s\n",
  			what, pixels, which);
  
  		if (i < ncol_desc)
  			continue;
  
  		/* Handle row descriptors */
  		if (pixelcode
  		    == SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_EMBEDDED) {
  			embedded_start = line_count;
  		} else {
  			if (pixelcode == SMIAPP_FRAME_FORMAT_DESC_PIXELCODE_VISIBLE
  			    || pixels >= sensor->limits[SMIAPP_LIMIT_MIN_FRAME_LENGTH_LINES] / 2)
  				image_start = line_count;
  			if (embedded_start != -1 && embedded_end == -1)
  				embedded_end = line_count;
  		}
  		line_count += pixels;
  	}
  
  	if (embedded_start == -1 || embedded_end == -1) {
  		embedded_start = 0;
  		embedded_end = 0;
  	}
  
  	sensor->image_start = image_start;
  
  	dev_dbg(&client->dev, "embedded data from lines %d to %d\n",
  		embedded_start, embedded_end);
  	dev_dbg(&client->dev, "image data starts at line %d\n", image_start);
  
  	return 0;
  }
  
  static int smiapp_pll_configure(struct smiapp_sensor *sensor)
  {
  	struct smiapp_pll *pll = &sensor->pll;
  	int rval;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_VT_PIX_CLK_DIV, pll->vt.pix_clk_div);
  	if (rval < 0)
  		return rval;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_VT_SYS_CLK_DIV, pll->vt.sys_clk_div);
  	if (rval < 0)
  		return rval;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_PRE_PLL_CLK_DIV, pll->pre_pll_clk_div);
  	if (rval < 0)
  		return rval;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_PLL_MULTIPLIER, pll->pll_multiplier);
  	if (rval < 0)
  		return rval;
  
  	/* Lane op clock ratio does not apply here. */
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U32_REQUESTED_LINK_BIT_RATE_MBPS,
  		DIV_ROUND_UP(pll->op.sys_clk_freq_hz, 1000000 / 256 / 256));
  	if (rval < 0 || sensor->minfo.smiapp_profile == SMIAPP_PROFILE_0)
  		return rval;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_OP_PIX_CLK_DIV, pll->op.pix_clk_div);
  	if (rval < 0)
  		return rval;
  
  	return smiapp_write(
  		sensor, SMIAPP_REG_U16_OP_SYS_CLK_DIV, pll->op.sys_clk_div);
  }
  
  static int smiapp_pll_try(struct smiapp_sensor *sensor,
  			  struct smiapp_pll *pll)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	struct smiapp_pll_limits lim = {
  		.min_pre_pll_clk_div = sensor->limits[SMIAPP_LIMIT_MIN_PRE_PLL_CLK_DIV],
  		.max_pre_pll_clk_div = sensor->limits[SMIAPP_LIMIT_MAX_PRE_PLL_CLK_DIV],
  		.min_pll_ip_freq_hz = sensor->limits[SMIAPP_LIMIT_MIN_PLL_IP_FREQ_HZ],
  		.max_pll_ip_freq_hz = sensor->limits[SMIAPP_LIMIT_MAX_PLL_IP_FREQ_HZ],
  		.min_pll_multiplier = sensor->limits[SMIAPP_LIMIT_MIN_PLL_MULTIPLIER],
  		.max_pll_multiplier = sensor->limits[SMIAPP_LIMIT_MAX_PLL_MULTIPLIER],
  		.min_pll_op_freq_hz = sensor->limits[SMIAPP_LIMIT_MIN_PLL_OP_FREQ_HZ],
  		.max_pll_op_freq_hz = sensor->limits[SMIAPP_LIMIT_MAX_PLL_OP_FREQ_HZ],
  
  		.op.min_sys_clk_div = sensor->limits[SMIAPP_LIMIT_MIN_OP_SYS_CLK_DIV],
  		.op.max_sys_clk_div = sensor->limits[SMIAPP_LIMIT_MAX_OP_SYS_CLK_DIV],
  		.op.min_pix_clk_div = sensor->limits[SMIAPP_LIMIT_MIN_OP_PIX_CLK_DIV],
  		.op.max_pix_clk_div = sensor->limits[SMIAPP_LIMIT_MAX_OP_PIX_CLK_DIV],
  		.op.min_sys_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MIN_OP_SYS_CLK_FREQ_HZ],
  		.op.max_sys_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MAX_OP_SYS_CLK_FREQ_HZ],
  		.op.min_pix_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MIN_OP_PIX_CLK_FREQ_HZ],
  		.op.max_pix_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MAX_OP_PIX_CLK_FREQ_HZ],
  
  		.vt.min_sys_clk_div = sensor->limits[SMIAPP_LIMIT_MIN_VT_SYS_CLK_DIV],
  		.vt.max_sys_clk_div = sensor->limits[SMIAPP_LIMIT_MAX_VT_SYS_CLK_DIV],
  		.vt.min_pix_clk_div = sensor->limits[SMIAPP_LIMIT_MIN_VT_PIX_CLK_DIV],
  		.vt.max_pix_clk_div = sensor->limits[SMIAPP_LIMIT_MAX_VT_PIX_CLK_DIV],
  		.vt.min_sys_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MIN_VT_SYS_CLK_FREQ_HZ],
  		.vt.max_sys_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MAX_VT_SYS_CLK_FREQ_HZ],
  		.vt.min_pix_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MIN_VT_PIX_CLK_FREQ_HZ],
  		.vt.max_pix_clk_freq_hz = sensor->limits[SMIAPP_LIMIT_MAX_VT_PIX_CLK_FREQ_HZ],
  
  		.min_line_length_pck_bin = sensor->limits[SMIAPP_LIMIT_MIN_LINE_LENGTH_PCK_BIN],
  		.min_line_length_pck = sensor->limits[SMIAPP_LIMIT_MIN_LINE_LENGTH_PCK],
  	};
  
  	return smiapp_pll_calculate(&client->dev, &lim, pll);
  }
  
  static int smiapp_pll_update(struct smiapp_sensor *sensor)
  {
  	struct smiapp_pll *pll = &sensor->pll;
  	int rval;
  
  	pll->binning_horizontal = sensor->binning_horizontal;
  	pll->binning_vertical = sensor->binning_vertical;
  	pll->link_freq =
  		sensor->link_freq->qmenu_int[sensor->link_freq->val];
  	pll->scale_m = sensor->scale_m;
  	pll->bits_per_pixel = sensor->csi_format->compressed;
  
  	rval = smiapp_pll_try(sensor, pll);
  	if (rval < 0)
  		return rval;
  
  	__v4l2_ctrl_s_ctrl_int64(sensor->pixel_rate_parray,
  				 pll->pixel_rate_pixel_array);
  	__v4l2_ctrl_s_ctrl_int64(sensor->pixel_rate_csi, pll->pixel_rate_csi);
  
  	return 0;
  }
  
  
  /*
   *
   * V4L2 Controls handling
   *
   */
  
  static void __smiapp_update_exposure_limits(struct smiapp_sensor *sensor)
  {
  	struct v4l2_ctrl *ctrl = sensor->exposure;
  	int max;
  
  	max = sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].height
  		+ sensor->vblank->val
  		- sensor->limits[SMIAPP_LIMIT_COARSE_INTEGRATION_TIME_MAX_MARGIN];
  
  	__v4l2_ctrl_modify_range(ctrl, ctrl->minimum, max, ctrl->step, max);
  }
  
  /*
   * Order matters.
   *
   * 1. Bits-per-pixel, descending.
   * 2. Bits-per-pixel compressed, descending.
   * 3. Pixel order, same as in pixel_order_str. Formats for all four pixel
   *    orders must be defined.
   */
  static const struct smiapp_csi_data_format smiapp_csi_data_formats[] = {
  	{ MEDIA_BUS_FMT_SGRBG16_1X16, 16, 16, SMIAPP_PIXEL_ORDER_GRBG, },
  	{ MEDIA_BUS_FMT_SRGGB16_1X16, 16, 16, SMIAPP_PIXEL_ORDER_RGGB, },
  	{ MEDIA_BUS_FMT_SBGGR16_1X16, 16, 16, SMIAPP_PIXEL_ORDER_BGGR, },
  	{ MEDIA_BUS_FMT_SGBRG16_1X16, 16, 16, SMIAPP_PIXEL_ORDER_GBRG, },
  	{ MEDIA_BUS_FMT_SGRBG14_1X14, 14, 14, SMIAPP_PIXEL_ORDER_GRBG, },
  	{ MEDIA_BUS_FMT_SRGGB14_1X14, 14, 14, SMIAPP_PIXEL_ORDER_RGGB, },
  	{ MEDIA_BUS_FMT_SBGGR14_1X14, 14, 14, SMIAPP_PIXEL_ORDER_BGGR, },
  	{ MEDIA_BUS_FMT_SGBRG14_1X14, 14, 14, SMIAPP_PIXEL_ORDER_GBRG, },
  	{ MEDIA_BUS_FMT_SGRBG12_1X12, 12, 12, SMIAPP_PIXEL_ORDER_GRBG, },
  	{ MEDIA_BUS_FMT_SRGGB12_1X12, 12, 12, SMIAPP_PIXEL_ORDER_RGGB, },
  	{ MEDIA_BUS_FMT_SBGGR12_1X12, 12, 12, SMIAPP_PIXEL_ORDER_BGGR, },
  	{ MEDIA_BUS_FMT_SGBRG12_1X12, 12, 12, SMIAPP_PIXEL_ORDER_GBRG, },
  	{ MEDIA_BUS_FMT_SGRBG10_1X10, 10, 10, SMIAPP_PIXEL_ORDER_GRBG, },
  	{ MEDIA_BUS_FMT_SRGGB10_1X10, 10, 10, SMIAPP_PIXEL_ORDER_RGGB, },
  	{ MEDIA_BUS_FMT_SBGGR10_1X10, 10, 10, SMIAPP_PIXEL_ORDER_BGGR, },
  	{ MEDIA_BUS_FMT_SGBRG10_1X10, 10, 10, SMIAPP_PIXEL_ORDER_GBRG, },
  	{ MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, 10, 8, SMIAPP_PIXEL_ORDER_GRBG, },
  	{ MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8, 10, 8, SMIAPP_PIXEL_ORDER_RGGB, },
  	{ MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8, 10, 8, SMIAPP_PIXEL_ORDER_BGGR, },
  	{ MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8, 10, 8, SMIAPP_PIXEL_ORDER_GBRG, },
  	{ MEDIA_BUS_FMT_SGRBG8_1X8, 8, 8, SMIAPP_PIXEL_ORDER_GRBG, },
  	{ MEDIA_BUS_FMT_SRGGB8_1X8, 8, 8, SMIAPP_PIXEL_ORDER_RGGB, },
  	{ MEDIA_BUS_FMT_SBGGR8_1X8, 8, 8, SMIAPP_PIXEL_ORDER_BGGR, },
  	{ MEDIA_BUS_FMT_SGBRG8_1X8, 8, 8, SMIAPP_PIXEL_ORDER_GBRG, },
  };
  
  static const char *pixel_order_str[] = { "GRBG", "RGGB", "BGGR", "GBRG" };
  
  #define to_csi_format_idx(fmt) (((unsigned long)(fmt)			\
  				 - (unsigned long)smiapp_csi_data_formats) \
  				/ sizeof(*smiapp_csi_data_formats))
  
  static u32 smiapp_pixel_order(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	int flip = 0;
  
  	if (sensor->hflip) {
  		if (sensor->hflip->val)
  			flip |= SMIAPP_IMAGE_ORIENTATION_HFLIP;
  
  		if (sensor->vflip->val)
  			flip |= SMIAPP_IMAGE_ORIENTATION_VFLIP;
  	}
  
  	flip ^= sensor->hvflip_inv_mask;
  
  	dev_dbg(&client->dev, "flip %d\n", flip);
  	return sensor->default_pixel_order ^ flip;
  }
  
  static void smiapp_update_mbus_formats(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	unsigned int csi_format_idx =
  		to_csi_format_idx(sensor->csi_format) & ~3;
  	unsigned int internal_csi_format_idx =
  		to_csi_format_idx(sensor->internal_csi_format) & ~3;
  	unsigned int pixel_order = smiapp_pixel_order(sensor);
  
  	sensor->mbus_frame_fmts =
  		sensor->default_mbus_frame_fmts << pixel_order;
  	sensor->csi_format =
  		&smiapp_csi_data_formats[csi_format_idx + pixel_order];
  	sensor->internal_csi_format =
  		&smiapp_csi_data_formats[internal_csi_format_idx
  					 + pixel_order];
  
  	BUG_ON(max(internal_csi_format_idx, csi_format_idx) + pixel_order
  	       >= ARRAY_SIZE(smiapp_csi_data_formats));
  
  	dev_dbg(&client->dev, "new pixel order %s\n",
  		pixel_order_str[pixel_order]);
  }
  
  static const char * const smiapp_test_patterns[] = {
  	"Disabled",
  	"Solid Colour",
  	"Eight Vertical Colour Bars",
  	"Colour Bars With Fade to Grey",
  	"Pseudorandom Sequence (PN9)",
  };
  
  static int smiapp_set_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct smiapp_sensor *sensor =
  		container_of(ctrl->handler, struct smiapp_subdev, ctrl_handler)
  			->sensor;
  	u32 orient = 0;
  	int exposure;
  	int rval;
  
  	switch (ctrl->id) {
  	case V4L2_CID_ANALOGUE_GAIN:
  		return smiapp_write(
  			sensor,
  			SMIAPP_REG_U16_ANALOGUE_GAIN_CODE_GLOBAL, ctrl->val);
  
  	case V4L2_CID_EXPOSURE:
  		return smiapp_write(
  			sensor,
  			SMIAPP_REG_U16_COARSE_INTEGRATION_TIME, ctrl->val);
  
  	case V4L2_CID_HFLIP:
  	case V4L2_CID_VFLIP:
  		if (sensor->streaming)
  			return -EBUSY;
  
  		if (sensor->hflip->val)
  			orient |= SMIAPP_IMAGE_ORIENTATION_HFLIP;
  
  		if (sensor->vflip->val)
  			orient |= SMIAPP_IMAGE_ORIENTATION_VFLIP;
  
  		orient ^= sensor->hvflip_inv_mask;
  		rval = smiapp_write(sensor,
  				    SMIAPP_REG_U8_IMAGE_ORIENTATION,
  				    orient);
  		if (rval < 0)
  			return rval;
  
  		smiapp_update_mbus_formats(sensor);
  
  		return 0;
  
  	case V4L2_CID_VBLANK:
  		exposure = sensor->exposure->val;
  
  		__smiapp_update_exposure_limits(sensor);
  
  		if (exposure > sensor->exposure->maximum) {
  			sensor->exposure->val =
  				sensor->exposure->maximum;
  			rval = smiapp_set_ctrl(
  				sensor->exposure);
  			if (rval < 0)
  				return rval;
  		}
  
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_FRAME_LENGTH_LINES,
  			sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].height
  			+ ctrl->val);
  
  	case V4L2_CID_HBLANK:
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_LINE_LENGTH_PCK,
  			sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].width
  			+ ctrl->val);
  
  	case V4L2_CID_LINK_FREQ:
  		if (sensor->streaming)
  			return -EBUSY;
  
  		return smiapp_pll_update(sensor);
  
  	case V4L2_CID_TEST_PATTERN: {
  		unsigned int i;
  
  		for (i = 0; i < ARRAY_SIZE(sensor->test_data); i++)
  			v4l2_ctrl_activate(
  				sensor->test_data[i],
  				ctrl->val ==
  				V4L2_SMIAPP_TEST_PATTERN_MODE_SOLID_COLOUR);
  
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_TEST_PATTERN_MODE, ctrl->val);
  	}
  
  	case V4L2_CID_TEST_PATTERN_RED:
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_TEST_DATA_RED, ctrl->val);
  
  	case V4L2_CID_TEST_PATTERN_GREENR:
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_TEST_DATA_GREENR, ctrl->val);
  
  	case V4L2_CID_TEST_PATTERN_BLUE:
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_TEST_DATA_BLUE, ctrl->val);
  
  	case V4L2_CID_TEST_PATTERN_GREENB:
  		return smiapp_write(
  			sensor, SMIAPP_REG_U16_TEST_DATA_GREENB, ctrl->val);
  
  	case V4L2_CID_PIXEL_RATE:
  		/* For v4l2_ctrl_s_ctrl_int64() used internally. */
  		return 0;
  
  	default:
  		return -EINVAL;
  	}
  }
  
  static const struct v4l2_ctrl_ops smiapp_ctrl_ops = {
  	.s_ctrl = smiapp_set_ctrl,
  };
  
  static int smiapp_init_controls(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	int rval;
  
  	rval = v4l2_ctrl_handler_init(&sensor->pixel_array->ctrl_handler, 12);
  	if (rval)
  		return rval;
  
  	sensor->pixel_array->ctrl_handler.lock = &sensor->mutex;
  
  	sensor->analog_gain = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_ANALOGUE_GAIN,
  		sensor->limits[SMIAPP_LIMIT_ANALOGUE_GAIN_CODE_MIN],
  		sensor->limits[SMIAPP_LIMIT_ANALOGUE_GAIN_CODE_MAX],
  		max(sensor->limits[SMIAPP_LIMIT_ANALOGUE_GAIN_CODE_STEP], 1U),
  		sensor->limits[SMIAPP_LIMIT_ANALOGUE_GAIN_CODE_MIN]);
  
  	/* Exposure limits will be updated soon, use just something here. */
  	sensor->exposure = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_EXPOSURE, 0, 0, 1, 0);
  
  	sensor->hflip = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_HFLIP, 0, 1, 1, 0);
  	sensor->vflip = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_VFLIP, 0, 1, 1, 0);
  
  	sensor->vblank = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_VBLANK, 0, 1, 1, 0);
  
  	if (sensor->vblank)
  		sensor->vblank->flags |= V4L2_CTRL_FLAG_UPDATE;
  
  	sensor->hblank = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_HBLANK, 0, 1, 1, 0);
  
  	if (sensor->hblank)
  		sensor->hblank->flags |= V4L2_CTRL_FLAG_UPDATE;
  
  	sensor->pixel_rate_parray = v4l2_ctrl_new_std(
  		&sensor->pixel_array->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_PIXEL_RATE, 1, INT_MAX, 1, 1);
  
  	v4l2_ctrl_new_std_menu_items(&sensor->pixel_array->ctrl_handler,
  				     &smiapp_ctrl_ops, V4L2_CID_TEST_PATTERN,
  				     ARRAY_SIZE(smiapp_test_patterns) - 1,
  				     0, 0, smiapp_test_patterns);
  
  	if (sensor->pixel_array->ctrl_handler.error) {
  		dev_err(&client->dev,
  			"pixel array controls initialization failed (%d)\n",
  			sensor->pixel_array->ctrl_handler.error);
  		return sensor->pixel_array->ctrl_handler.error;
  	}
  
  	sensor->pixel_array->sd.ctrl_handler =
  		&sensor->pixel_array->ctrl_handler;
  
  	v4l2_ctrl_cluster(2, &sensor->hflip);
  
  	rval = v4l2_ctrl_handler_init(&sensor->src->ctrl_handler, 0);
  	if (rval)
  		return rval;
  
  	sensor->src->ctrl_handler.lock = &sensor->mutex;
  
  	sensor->pixel_rate_csi = v4l2_ctrl_new_std(
  		&sensor->src->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_PIXEL_RATE, 1, INT_MAX, 1, 1);
  
  	if (sensor->src->ctrl_handler.error) {
  		dev_err(&client->dev,
  			"src controls initialization failed (%d)\n",
  			sensor->src->ctrl_handler.error);
  		return sensor->src->ctrl_handler.error;
  	}
  
  	sensor->src->sd.ctrl_handler = &sensor->src->ctrl_handler;
  
  	return 0;
  }
  
  /*
   * For controls that require information on available media bus codes
   * and linke frequencies.
   */
  static int smiapp_init_late_controls(struct smiapp_sensor *sensor)
  {
  	unsigned long *valid_link_freqs = &sensor->valid_link_freqs[
  		sensor->csi_format->compressed - SMIAPP_COMPRESSED_BASE];
  	unsigned int max, i;
  
  	for (i = 0; i < ARRAY_SIZE(sensor->test_data); i++) {
  		int max_value = (1 << sensor->csi_format->width) - 1;
  
  		sensor->test_data[i] = v4l2_ctrl_new_std(
  				&sensor->pixel_array->ctrl_handler,
  				&smiapp_ctrl_ops, V4L2_CID_TEST_PATTERN_RED + i,
  				0, max_value, 1, max_value);
  	}
  
  	for (max = 0; sensor->hwcfg->op_sys_clock[max + 1]; max++);
  
  	sensor->link_freq = v4l2_ctrl_new_int_menu(
  		&sensor->src->ctrl_handler, &smiapp_ctrl_ops,
  		V4L2_CID_LINK_FREQ, __fls(*valid_link_freqs),
  		__ffs(*valid_link_freqs), sensor->hwcfg->op_sys_clock);
  
  	return sensor->src->ctrl_handler.error;
  }
  
  static void smiapp_free_controls(struct smiapp_sensor *sensor)
  {
  	unsigned int i;
  
  	for (i = 0; i < sensor->ssds_used; i++)
  		v4l2_ctrl_handler_free(&sensor->ssds[i].ctrl_handler);
  }
  
  static int smiapp_get_limits(struct smiapp_sensor *sensor, int const *limit,
  			     unsigned int n)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	unsigned int i;
  	u32 val;
  	int rval;
  
  	for (i = 0; i < n; i++) {
  		rval = smiapp_read(
  			sensor, smiapp_reg_limits[limit[i]].addr, &val);
  		if (rval)
  			return rval;
  		sensor->limits[limit[i]] = val;
  		dev_dbg(&client->dev, "0x%8.8x \"%s\" = %u, 0x%x\n",
  			smiapp_reg_limits[limit[i]].addr,
  			smiapp_reg_limits[limit[i]].what, val, val);
  	}
  
  	return 0;
  }
  
  static int smiapp_get_all_limits(struct smiapp_sensor *sensor)
  {
  	unsigned int i;
  	int rval;
  
  	for (i = 0; i < SMIAPP_LIMIT_LAST; i++) {
  		rval = smiapp_get_limits(sensor, &i, 1);
  		if (rval < 0)
  			return rval;
  	}
  
  	if (sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN] == 0)
  		smiapp_replace_limit(sensor, SMIAPP_LIMIT_SCALER_N_MIN, 16);
  
  	return 0;
  }
  
  static int smiapp_get_limits_binning(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	static u32 const limits[] = {
  		SMIAPP_LIMIT_MIN_FRAME_LENGTH_LINES_BIN,
  		SMIAPP_LIMIT_MAX_FRAME_LENGTH_LINES_BIN,
  		SMIAPP_LIMIT_MIN_LINE_LENGTH_PCK_BIN,
  		SMIAPP_LIMIT_MAX_LINE_LENGTH_PCK_BIN,
  		SMIAPP_LIMIT_MIN_LINE_BLANKING_PCK_BIN,
  		SMIAPP_LIMIT_FINE_INTEGRATION_TIME_MIN_BIN,
  		SMIAPP_LIMIT_FINE_INTEGRATION_TIME_MAX_MARGIN_BIN,
  	};
  	static u32 const limits_replace[] = {
  		SMIAPP_LIMIT_MIN_FRAME_LENGTH_LINES,
  		SMIAPP_LIMIT_MAX_FRAME_LENGTH_LINES,
  		SMIAPP_LIMIT_MIN_LINE_LENGTH_PCK,
  		SMIAPP_LIMIT_MAX_LINE_LENGTH_PCK,
  		SMIAPP_LIMIT_MIN_LINE_BLANKING_PCK,
  		SMIAPP_LIMIT_FINE_INTEGRATION_TIME_MIN,
  		SMIAPP_LIMIT_FINE_INTEGRATION_TIME_MAX_MARGIN,
  	};
  	unsigned int i;
  	int rval;
  
  	if (sensor->limits[SMIAPP_LIMIT_BINNING_CAPABILITY] ==
  	    SMIAPP_BINNING_CAPABILITY_NO) {
  		for (i = 0; i < ARRAY_SIZE(limits); i++)
  			sensor->limits[limits[i]] =
  				sensor->limits[limits_replace[i]];
  
  		return 0;
  	}
  
  	rval = smiapp_get_limits(sensor, limits, ARRAY_SIZE(limits));
  	if (rval < 0)
  		return rval;
  
  	/*
  	 * Sanity check whether the binning limits are valid. If not,
  	 * use the non-binning ones.
  	 */
  	if (sensor->limits[SMIAPP_LIMIT_MIN_FRAME_LENGTH_LINES_BIN]
  	    && sensor->limits[SMIAPP_LIMIT_MIN_LINE_LENGTH_PCK_BIN]
  	    && sensor->limits[SMIAPP_LIMIT_MIN_LINE_BLANKING_PCK_BIN])
  		return 0;
  
  	for (i = 0; i < ARRAY_SIZE(limits); i++) {
  		dev_dbg(&client->dev,
  			"replace limit 0x%8.8x \"%s\" = %d, 0x%x\n",
  			smiapp_reg_limits[limits[i]].addr,
  			smiapp_reg_limits[limits[i]].what,
  			sensor->limits[limits_replace[i]],
  			sensor->limits[limits_replace[i]]);
  		sensor->limits[limits[i]] =
  			sensor->limits[limits_replace[i]];
  	}
  
  	return 0;
  }
  
  static int smiapp_get_mbus_formats(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	struct smiapp_pll *pll = &sensor->pll;
  	unsigned int type, n;
  	unsigned int i, pixel_order;
  	int rval;
  
  	rval = smiapp_read(
  		sensor, SMIAPP_REG_U8_DATA_FORMAT_MODEL_TYPE, &type);
  	if (rval)
  		return rval;
  
  	dev_dbg(&client->dev, "data_format_model_type %d\n", type);
  
  	rval = smiapp_read(sensor, SMIAPP_REG_U8_PIXEL_ORDER,
  			   &pixel_order);
  	if (rval)
  		return rval;
  
  	if (pixel_order >= ARRAY_SIZE(pixel_order_str)) {
  		dev_dbg(&client->dev, "bad pixel order %d\n", pixel_order);
  		return -EINVAL;
  	}
  
  	dev_dbg(&client->dev, "pixel order %d (%s)\n", pixel_order,
  		pixel_order_str[pixel_order]);
  
  	switch (type) {
  	case SMIAPP_DATA_FORMAT_MODEL_TYPE_NORMAL:
  		n = SMIAPP_DATA_FORMAT_MODEL_TYPE_NORMAL_N;
  		break;
  	case SMIAPP_DATA_FORMAT_MODEL_TYPE_EXTENDED:
  		n = SMIAPP_DATA_FORMAT_MODEL_TYPE_EXTENDED_N;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	sensor->default_pixel_order = pixel_order;
  	sensor->mbus_frame_fmts = 0;
  
  	for (i = 0; i < n; i++) {
  		unsigned int fmt, j;
  
  		rval = smiapp_read(
  			sensor,
  			SMIAPP_REG_U16_DATA_FORMAT_DESCRIPTOR(i), &fmt);
  		if (rval)
  			return rval;
  
  		dev_dbg(&client->dev, "%u: bpp %u, compressed %u\n",
  			i, fmt >> 8, (u8)fmt);
  
  		for (j = 0; j < ARRAY_SIZE(smiapp_csi_data_formats); j++) {
  			const struct smiapp_csi_data_format *f =
  				&smiapp_csi_data_formats[j];
  
  			if (f->pixel_order != SMIAPP_PIXEL_ORDER_GRBG)
  				continue;
  
  			if (f->width != fmt >> 8 || f->compressed != (u8)fmt)
  				continue;
  
  			dev_dbg(&client->dev, "jolly good! %d\n", j);
  
  			sensor->default_mbus_frame_fmts |= 1 << j;
  		}
  	}
  
  	/* Figure out which BPP values can be used with which formats. */
  	pll->binning_horizontal = 1;
  	pll->binning_vertical = 1;
  	pll->scale_m = sensor->scale_m;
  
  	for (i = 0; i < ARRAY_SIZE(smiapp_csi_data_formats); i++) {
  		const struct smiapp_csi_data_format *f =
  			&smiapp_csi_data_formats[i];
  		unsigned long *valid_link_freqs =
  			&sensor->valid_link_freqs[
  				f->compressed - SMIAPP_COMPRESSED_BASE];
  		unsigned int j;
  
  		BUG_ON(f->compressed < SMIAPP_COMPRESSED_BASE);
  		BUG_ON(f->compressed > SMIAPP_COMPRESSED_MAX);
  
  		if (!(sensor->default_mbus_frame_fmts & 1 << i))
  			continue;
  
  		pll->bits_per_pixel = f->compressed;
  
  		for (j = 0; sensor->hwcfg->op_sys_clock[j]; j++) {
  			pll->link_freq = sensor->hwcfg->op_sys_clock[j];
  
  			rval = smiapp_pll_try(sensor, pll);
  			dev_dbg(&client->dev, "link freq %u Hz, bpp %u %s\n",
  				pll->link_freq, pll->bits_per_pixel,
  				rval ? "not ok" : "ok");
  			if (rval)
  				continue;
  
  			set_bit(j, valid_link_freqs);
  		}
  
  		if (!*valid_link_freqs) {
  			dev_info(&client->dev,
  				 "no valid link frequencies for %u bpp\n",
  				 f->compressed);
  			sensor->default_mbus_frame_fmts &= ~BIT(i);
  			continue;
  		}
  
  		if (!sensor->csi_format
  		    || f->width > sensor->csi_format->width
  		    || (f->width == sensor->csi_format->width
  			&& f->compressed > sensor->csi_format->compressed)) {
  			sensor->csi_format = f;
  			sensor->internal_csi_format = f;
  		}
  	}
  
  	if (!sensor->csi_format) {
  		dev_err(&client->dev, "no supported mbus code found\n");
  		return -EINVAL;
  	}
  
  	smiapp_update_mbus_formats(sensor);
  
  	return 0;
  }
  
  static void smiapp_update_blanking(struct smiapp_sensor *sensor)
  {
  	struct v4l2_ctrl *vblank = sensor->vblank;
  	struct v4l2_ctrl *hblank = sensor->hblank;
  	int min, max;
  
  	min = max_t(int,
  		    sensor->limits[SMIAPP_LIMIT_MIN_FRAME_BLANKING_LINES],
  		    sensor->limits[SMIAPP_LIMIT_MIN_FRAME_LENGTH_LINES_BIN] -
  		    sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].height);
  	max = sensor->limits[SMIAPP_LIMIT_MAX_FRAME_LENGTH_LINES_BIN] -
  		sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].height;
  
  	__v4l2_ctrl_modify_range(vblank, min, max, vblank->step, min);
  
  	min = max_t(int,
  		    sensor->limits[SMIAPP_LIMIT_MIN_LINE_LENGTH_PCK_BIN] -
  		    sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].width,
  		    sensor->limits[SMIAPP_LIMIT_MIN_LINE_BLANKING_PCK_BIN]);
  	max = sensor->limits[SMIAPP_LIMIT_MAX_LINE_LENGTH_PCK_BIN] -
  		sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].width;
  
  	__v4l2_ctrl_modify_range(hblank, min, max, hblank->step, min);
  
  	__smiapp_update_exposure_limits(sensor);
  }
  
  static int smiapp_update_mode(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	unsigned int binning_mode;
  	int rval;
  
  	dev_dbg(&client->dev, "frame size: %dx%d\n",
  		sensor->src->crop[SMIAPP_PAD_SRC].width,
  		sensor->src->crop[SMIAPP_PAD_SRC].height);
  	dev_dbg(&client->dev, "csi format width: %d\n",
  		sensor->csi_format->width);
  
  	/* Binning has to be set up here; it affects limits */
  	if (sensor->binning_horizontal == 1 &&
  	    sensor->binning_vertical == 1) {
  		binning_mode = 0;
  	} else {
  		u8 binning_type =
  			(sensor->binning_horizontal << 4)
  			| sensor->binning_vertical;
  
  		rval = smiapp_write(
  			sensor, SMIAPP_REG_U8_BINNING_TYPE, binning_type);
  		if (rval < 0)
  			return rval;
  
  		binning_mode = 1;
  	}
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_BINNING_MODE, binning_mode);
  	if (rval < 0)
  		return rval;
  
  	/* Get updated limits due to binning */
  	rval = smiapp_get_limits_binning(sensor);
  	if (rval < 0)
  		return rval;
  
  	rval = smiapp_pll_update(sensor);
  	if (rval < 0)
  		return rval;
  
  	/* Output from pixel array, including blanking */
  	smiapp_update_blanking(sensor);
  
  	dev_dbg(&client->dev, "vblank\t\t%d\n", sensor->vblank->val);
  	dev_dbg(&client->dev, "hblank\t\t%d\n", sensor->hblank->val);
  
  	dev_dbg(&client->dev, "real timeperframe\t100/%d\n",
  		sensor->pll.pixel_rate_pixel_array /
  		((sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].width
  		  + sensor->hblank->val) *
  		 (sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].height
  		  + sensor->vblank->val) / 100));
  
  	return 0;
  }
  
  /*
   *
   * SMIA++ NVM handling
   *
   */
  static int smiapp_read_nvm(struct smiapp_sensor *sensor,
  			   unsigned char *nvm)
  {
  	u32 i, s, p, np, v;
  	int rval = 0, rval2;
  
  	np = sensor->nvm_size / SMIAPP_NVM_PAGE_SIZE;
  	for (p = 0; p < np; p++) {
  		rval = smiapp_write(
  			sensor,
  			SMIAPP_REG_U8_DATA_TRANSFER_IF_1_PAGE_SELECT, p);
  		if (rval)
  			goto out;
  
  		rval = smiapp_write(sensor,
  				    SMIAPP_REG_U8_DATA_TRANSFER_IF_1_CTRL,
  				    SMIAPP_DATA_TRANSFER_IF_1_CTRL_EN |
  				    SMIAPP_DATA_TRANSFER_IF_1_CTRL_RD_EN);
  		if (rval)
  			goto out;
  
  		for (i = 0; i < 1000; i++) {
  			rval = smiapp_read(
  				sensor,
  				SMIAPP_REG_U8_DATA_TRANSFER_IF_1_STATUS, &s);
  
  			if (rval)
  				goto out;
  
  			if (s & SMIAPP_DATA_TRANSFER_IF_1_STATUS_RD_READY)
  				break;
  
  			if (--i == 0) {
  				rval = -ETIMEDOUT;
  				goto out;
  			}
  
  		}
  
  		for (i = 0; i < SMIAPP_NVM_PAGE_SIZE; i++) {
  			rval = smiapp_read(
  				sensor,
  				SMIAPP_REG_U8_DATA_TRANSFER_IF_1_DATA_0 + i,
  				&v);
  			if (rval)
  				goto out;
  
  			*nvm++ = v;
  		}
  	}
  
  out:
  	rval2 = smiapp_write(sensor, SMIAPP_REG_U8_DATA_TRANSFER_IF_1_CTRL, 0);
  	if (rval < 0)
  		return rval;
  	else
  		return rval2;
  }
  
  /*
   *
   * SMIA++ CCI address control
   *
   */
  static int smiapp_change_cci_addr(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	int rval;
  	u32 val;
  
  	client->addr = sensor->hwcfg->i2c_addr_dfl;
  
  	rval = smiapp_write(sensor,
  			    SMIAPP_REG_U8_CCI_ADDRESS_CONTROL,
  			    sensor->hwcfg->i2c_addr_alt << 1);
  	if (rval)
  		return rval;
  
  	client->addr = sensor->hwcfg->i2c_addr_alt;
  
  	/* verify addr change went ok */
  	rval = smiapp_read(sensor, SMIAPP_REG_U8_CCI_ADDRESS_CONTROL, &val);
  	if (rval)
  		return rval;
  
  	if (val != sensor->hwcfg->i2c_addr_alt << 1)
  		return -ENODEV;
  
  	return 0;
  }
  
  /*
   *
   * SMIA++ Mode Control
   *
   */
  static int smiapp_setup_flash_strobe(struct smiapp_sensor *sensor)
  {
  	struct smiapp_flash_strobe_parms *strobe_setup;
  	unsigned int ext_freq = sensor->hwcfg->ext_clk;
  	u32 tmp;
  	u32 strobe_adjustment;
  	u32 strobe_width_high_rs;
  	int rval;
  
  	strobe_setup = sensor->hwcfg->strobe_setup;
  
  	/*
  	 * How to calculate registers related to strobe length. Please
  	 * do not change, or if you do at least know what you're
  	 * doing. :-)
  	 *
  	 * Sakari Ailus <sakari.ailus@iki.fi> 2010-10-25
  	 *
  	 * flash_strobe_length [us] / 10^6 = (tFlash_strobe_width_ctrl
  	 *	/ EXTCLK freq [Hz]) * flash_strobe_adjustment
  	 *
  	 * tFlash_strobe_width_ctrl E N, [1 - 0xffff]
  	 * flash_strobe_adjustment E N, [1 - 0xff]
  	 *
  	 * The formula above is written as below to keep it on one
  	 * line:
  	 *
  	 * l / 10^6 = w / e * a
  	 *
  	 * Let's mark w * a by x:
  	 *
  	 * x = w * a
  	 *
  	 * Thus, we get:
  	 *
  	 * x = l * e / 10^6
  	 *
  	 * The strobe width must be at least as long as requested,
  	 * thus rounding upwards is needed.
  	 *
  	 * x = (l * e + 10^6 - 1) / 10^6
  	 * -----------------------------
  	 *
  	 * Maximum possible accuracy is wanted at all times. Thus keep
  	 * a as small as possible.
  	 *
  	 * Calculate a, assuming maximum w, with rounding upwards:
  	 *
  	 * a = (x + (2^16 - 1) - 1) / (2^16 - 1)
  	 * -------------------------------------
  	 *
  	 * Thus, we also get w, with that a, with rounding upwards:
  	 *
  	 * w = (x + a - 1) / a
  	 * -------------------
  	 *
  	 * To get limits:
  	 *
  	 * x E [1, (2^16 - 1) * (2^8 - 1)]
  	 *
  	 * Substituting maximum x to the original formula (with rounding),
  	 * the maximum l is thus
  	 *
  	 * (2^16 - 1) * (2^8 - 1) * 10^6 = l * e + 10^6 - 1
  	 *
  	 * l = (10^6 * (2^16 - 1) * (2^8 - 1) - 10^6 + 1) / e
  	 * --------------------------------------------------
  	 *
  	 * flash_strobe_length must be clamped between 1 and
  	 * (10^6 * (2^16 - 1) * (2^8 - 1) - 10^6 + 1) / EXTCLK freq.
  	 *
  	 * Then,
  	 *
  	 * flash_strobe_adjustment = ((flash_strobe_length *
  	 *	EXTCLK freq + 10^6 - 1) / 10^6 + (2^16 - 1) - 1) / (2^16 - 1)
  	 *
  	 * tFlash_strobe_width_ctrl = ((flash_strobe_length *
  	 *	EXTCLK freq + 10^6 - 1) / 10^6 +
  	 *	flash_strobe_adjustment - 1) / flash_strobe_adjustment
  	 */
  	tmp = div_u64(1000000ULL * ((1 << 16) - 1) * ((1 << 8) - 1) -
  		      1000000 + 1, ext_freq);
  	strobe_setup->strobe_width_high_us =
  		clamp_t(u32, strobe_setup->strobe_width_high_us, 1, tmp);
  
  	tmp = div_u64(((u64)strobe_setup->strobe_width_high_us * (u64)ext_freq +
  			1000000 - 1), 1000000ULL);
  	strobe_adjustment = (tmp + (1 << 16) - 1 - 1) / ((1 << 16) - 1);
  	strobe_width_high_rs = (tmp + strobe_adjustment - 1) /
  				strobe_adjustment;
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_FLASH_MODE_RS,
  			    strobe_setup->mode);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_FLASH_STROBE_ADJUSTMENT,
  			    strobe_adjustment);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_TFLASH_STROBE_WIDTH_HIGH_RS_CTRL,
  		strobe_width_high_rs);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_TFLASH_STROBE_DELAY_RS_CTRL,
  			    strobe_setup->strobe_delay);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_FLASH_STROBE_START_POINT,
  			    strobe_setup->stobe_start_point);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_FLASH_TRIGGER_RS,
  			    strobe_setup->trigger);
  
  out:
  	sensor->hwcfg->strobe_setup->trigger = 0;
  
  	return rval;
  }
  
  /* -----------------------------------------------------------------------------
   * Power management
   */
  
  static int smiapp_power_on(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	unsigned int sleep;
  	int rval;
  
  	rval = regulator_enable(sensor->vana);
  	if (rval) {
  		dev_err(&client->dev, "failed to enable vana regulator\n");
  		return rval;
  	}
  	usleep_range(1000, 1000);
  
  	rval = clk_prepare_enable(sensor->ext_clk);
  	if (rval < 0) {
  		dev_dbg(&client->dev, "failed to enable xclk\n");
  		goto out_xclk_fail;
  	}
  	usleep_range(1000, 1000);
  
  	gpiod_set_value(sensor->xshutdown, 1);
  
  	sleep = SMIAPP_RESET_DELAY(sensor->hwcfg->ext_clk);
  	usleep_range(sleep, sleep);
  
  	/*
  	 * Failures to respond to the address change command have been noticed.
  	 * Those failures seem to be caused by the sensor requiring a longer
  	 * boot time than advertised. An additional 10ms delay seems to work
  	 * around the issue, but the SMIA++ I2C write retry hack makes the delay
  	 * unnecessary. The failures need to be investigated to find a proper
  	 * fix, and a delay will likely need to be added here if the I2C write
  	 * retry hack is reverted before the root cause of the boot time issue
  	 * is found.
  	 */
  
  	if (sensor->hwcfg->i2c_addr_alt) {
  		rval = smiapp_change_cci_addr(sensor);
  		if (rval) {
  			dev_err(&client->dev, "cci address change error\n");
  			goto out_cci_addr_fail;
  		}
  	}
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_SOFTWARE_RESET,
  			    SMIAPP_SOFTWARE_RESET);
  	if (rval < 0) {
  		dev_err(&client->dev, "software reset failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	if (sensor->hwcfg->i2c_addr_alt) {
  		rval = smiapp_change_cci_addr(sensor);
  		if (rval) {
  			dev_err(&client->dev, "cci address change error\n");
  			goto out_cci_addr_fail;
  		}
  	}
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_COMPRESSION_MODE,
  			    SMIAPP_COMPRESSION_MODE_SIMPLE_PREDICTOR);
  	if (rval) {
  		dev_err(&client->dev, "compression mode set failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_EXTCLK_FREQUENCY_MHZ,
  		sensor->hwcfg->ext_clk / (1000000 / (1 << 8)));
  	if (rval) {
  		dev_err(&client->dev, "extclk frequency set failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_CSI_LANE_MODE,
  			    sensor->hwcfg->lanes - 1);
  	if (rval) {
  		dev_err(&client->dev, "csi lane mode set failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_FAST_STANDBY_CTRL,
  			    SMIAPP_FAST_STANDBY_CTRL_IMMEDIATE);
  	if (rval) {
  		dev_err(&client->dev, "fast standby set failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_CSI_SIGNALLING_MODE,
  			    sensor->hwcfg->csi_signalling_mode);
  	if (rval) {
  		dev_err(&client->dev, "csi signalling mode set failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	/* DPHY control done by sensor based on requested link rate */
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_DPHY_CTRL,
  			    SMIAPP_DPHY_CTRL_UI);
  	if (rval < 0)
  		return rval;
  
  	rval = smiapp_call_quirk(sensor, post_poweron);
  	if (rval) {
  		dev_err(&client->dev, "post_poweron quirks failed\n");
  		goto out_cci_addr_fail;
  	}
  
  	/* Are we still initialising...? If yes, return here. */
  	if (!sensor->pixel_array)
  		return 0;
  
  	rval = v4l2_ctrl_handler_setup(
  		&sensor->pixel_array->ctrl_handler);
  	if (rval)
  		goto out_cci_addr_fail;
  
  	rval = v4l2_ctrl_handler_setup(&sensor->src->ctrl_handler);
  	if (rval)
  		goto out_cci_addr_fail;
  
  	mutex_lock(&sensor->mutex);
  	rval = smiapp_update_mode(sensor);
  	mutex_unlock(&sensor->mutex);
  	if (rval < 0)
  		goto out_cci_addr_fail;
  
  	return 0;
  
  out_cci_addr_fail:
  	gpiod_set_value(sensor->xshutdown, 0);
  	clk_disable_unprepare(sensor->ext_clk);
  
  out_xclk_fail:
  	regulator_disable(sensor->vana);
  	return rval;
  }
  
  static void smiapp_power_off(struct smiapp_sensor *sensor)
  {
  	/*
  	 * Currently power/clock to lens are enable/disabled separately
  	 * but they are essentially the same signals. So if the sensor is
  	 * powered off while the lens is powered on the sensor does not
  	 * really see a power off and next time the cci address change
  	 * will fail. So do a soft reset explicitly here.
  	 */
  	if (sensor->hwcfg->i2c_addr_alt)
  		smiapp_write(sensor,
  			     SMIAPP_REG_U8_SOFTWARE_RESET,
  			     SMIAPP_SOFTWARE_RESET);
  
  	gpiod_set_value(sensor->xshutdown, 0);
  	clk_disable_unprepare(sensor->ext_clk);
  	usleep_range(5000, 5000);
  	regulator_disable(sensor->vana);
  	sensor->streaming = false;
  }
  
  static int smiapp_set_power(struct v4l2_subdev *subdev, int on)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	int ret = 0;
  
  	mutex_lock(&sensor->power_mutex);
  
  	if (on && !sensor->power_count) {
  		/* Power on and perform initialisation. */
  		ret = smiapp_power_on(sensor);
  		if (ret < 0)
  			goto out;
  	} else if (!on && sensor->power_count == 1) {
  		smiapp_power_off(sensor);
  	}
  
  	/* Update the power count. */
  	sensor->power_count += on ? 1 : -1;
  	WARN_ON(sensor->power_count < 0);
  
  out:
  	mutex_unlock(&sensor->power_mutex);
  	return ret;
  }
  
  /* -----------------------------------------------------------------------------
   * Video stream management
   */
  
  static int smiapp_start_streaming(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	int rval;
  
  	mutex_lock(&sensor->mutex);
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_CSI_DATA_FORMAT,
  			    (sensor->csi_format->width << 8) |
  			    sensor->csi_format->compressed);
  	if (rval)
  		goto out;
  
  	rval = smiapp_pll_configure(sensor);
  	if (rval)
  		goto out;
  
  	/* Analog crop start coordinates */
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_X_ADDR_START,
  			    sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].left);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_Y_ADDR_START,
  			    sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].top);
  	if (rval < 0)
  		goto out;
  
  	/* Analog crop end coordinates */
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_X_ADDR_END,
  		sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].left
  		+ sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].width - 1);
  	if (rval < 0)
  		goto out;
  
  	rval = smiapp_write(
  		sensor, SMIAPP_REG_U16_Y_ADDR_END,
  		sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].top
  		+ sensor->pixel_array->crop[SMIAPP_PA_PAD_SRC].height - 1);
  	if (rval < 0)
  		goto out;
  
  	/*
  	 * Output from pixel array, including blanking, is set using
  	 * controls below. No need to set here.
  	 */
  
  	/* Digital crop */
  	if (sensor->limits[SMIAPP_LIMIT_DIGITAL_CROP_CAPABILITY]
  	    == SMIAPP_DIGITAL_CROP_CAPABILITY_INPUT_CROP) {
  		rval = smiapp_write(
  			sensor, SMIAPP_REG_U16_DIGITAL_CROP_X_OFFSET,
  			sensor->scaler->crop[SMIAPP_PAD_SINK].left);
  		if (rval < 0)
  			goto out;
  
  		rval = smiapp_write(
  			sensor, SMIAPP_REG_U16_DIGITAL_CROP_Y_OFFSET,
  			sensor->scaler->crop[SMIAPP_PAD_SINK].top);
  		if (rval < 0)
  			goto out;
  
  		rval = smiapp_write(
  			sensor, SMIAPP_REG_U16_DIGITAL_CROP_IMAGE_WIDTH,
  			sensor->scaler->crop[SMIAPP_PAD_SINK].width);
  		if (rval < 0)
  			goto out;
  
  		rval = smiapp_write(
  			sensor, SMIAPP_REG_U16_DIGITAL_CROP_IMAGE_HEIGHT,
  			sensor->scaler->crop[SMIAPP_PAD_SINK].height);
  		if (rval < 0)
  			goto out;
  	}
  
  	/* Scaling */
  	if (sensor->limits[SMIAPP_LIMIT_SCALING_CAPABILITY]
  	    != SMIAPP_SCALING_CAPABILITY_NONE) {
  		rval = smiapp_write(sensor, SMIAPP_REG_U16_SCALING_MODE,
  				    sensor->scaling_mode);
  		if (rval < 0)
  			goto out;
  
  		rval = smiapp_write(sensor, SMIAPP_REG_U16_SCALE_M,
  				    sensor->scale_m);
  		if (rval < 0)
  			goto out;
  	}
  
  	/* Output size from sensor */
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_X_OUTPUT_SIZE,
  			    sensor->src->crop[SMIAPP_PAD_SRC].width);
  	if (rval < 0)
  		goto out;
  	rval = smiapp_write(sensor, SMIAPP_REG_U16_Y_OUTPUT_SIZE,
  			    sensor->src->crop[SMIAPP_PAD_SRC].height);
  	if (rval < 0)
  		goto out;
  
  	if ((sensor->limits[SMIAPP_LIMIT_FLASH_MODE_CAPABILITY] &
  	     (SMIAPP_FLASH_MODE_CAPABILITY_SINGLE_STROBE |
  	      SMIAPP_FLASH_MODE_CAPABILITY_MULTIPLE_STROBE)) &&
  	    sensor->hwcfg->strobe_setup != NULL &&
  	    sensor->hwcfg->strobe_setup->trigger != 0) {
  		rval = smiapp_setup_flash_strobe(sensor);
  		if (rval)
  			goto out;
  	}
  
  	rval = smiapp_call_quirk(sensor, pre_streamon);
  	if (rval) {
  		dev_err(&client->dev, "pre_streamon quirks failed\n");
  		goto out;
  	}
  
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_MODE_SELECT,
  			    SMIAPP_MODE_SELECT_STREAMING);
  
  out:
  	mutex_unlock(&sensor->mutex);
  
  	return rval;
  }
  
  static int smiapp_stop_streaming(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	int rval;
  
  	mutex_lock(&sensor->mutex);
  	rval = smiapp_write(sensor, SMIAPP_REG_U8_MODE_SELECT,
  			    SMIAPP_MODE_SELECT_SOFTWARE_STANDBY);
  	if (rval)
  		goto out;
  
  	rval = smiapp_call_quirk(sensor, post_streamoff);
  	if (rval)
  		dev_err(&client->dev, "post_streamoff quirks failed\n");
  
  out:
  	mutex_unlock(&sensor->mutex);
  	return rval;
  }
  
  /* -----------------------------------------------------------------------------
   * V4L2 subdev video operations
   */
  
  static int smiapp_set_stream(struct v4l2_subdev *subdev, int enable)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	int rval;
  
  	if (sensor->streaming == enable)
  		return 0;
  
  	if (enable) {
  		sensor->streaming = true;
  		rval = smiapp_start_streaming(sensor);
  		if (rval < 0)
  			sensor->streaming = false;
  	} else {
  		rval = smiapp_stop_streaming(sensor);
  		sensor->streaming = false;
  	}
  
  	return rval;
  }
  
  static int smiapp_enum_mbus_code(struct v4l2_subdev *subdev,
  				 struct v4l2_subdev_pad_config *cfg,
  				 struct v4l2_subdev_mbus_code_enum *code)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(subdev);
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	unsigned int i;
  	int idx = -1;
  	int rval = -EINVAL;
  
  	mutex_lock(&sensor->mutex);
  
  	dev_err(&client->dev, "subdev %s, pad %d, index %d\n",
  		subdev->name, code->pad, code->index);
  
  	if (subdev != &sensor->src->sd || code->pad != SMIAPP_PAD_SRC) {
  		if (code->index)
  			goto out;
  
  		code->code = sensor->internal_csi_format->code;
  		rval = 0;
  		goto out;
  	}
  
  	for (i = 0; i < ARRAY_SIZE(smiapp_csi_data_formats); i++) {
  		if (sensor->mbus_frame_fmts & (1 << i))
  			idx++;
  
  		if (idx == code->index) {
  			code->code = smiapp_csi_data_formats[i].code;
  			dev_err(&client->dev, "found index %d, i %d, code %x\n",
  				code->index, i, code->code);
  			rval = 0;
  			break;
  		}
  	}
  
  out:
  	mutex_unlock(&sensor->mutex);
  
  	return rval;
  }
  
  static u32 __smiapp_get_mbus_code(struct v4l2_subdev *subdev,
  				  unsigned int pad)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  
  	if (subdev == &sensor->src->sd && pad == SMIAPP_PAD_SRC)
  		return sensor->csi_format->code;
  	else
  		return sensor->internal_csi_format->code;
  }
  
  static int __smiapp_get_format(struct v4l2_subdev *subdev,
  			       struct v4l2_subdev_pad_config *cfg,
  			       struct v4l2_subdev_format *fmt)
  {
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  
  	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
  		fmt->format = *v4l2_subdev_get_try_format(subdev, cfg, fmt->pad);
  	} else {
  		struct v4l2_rect *r;
  
  		if (fmt->pad == ssd->source_pad)
  			r = &ssd->crop[ssd->source_pad];
  		else
  			r = &ssd->sink_fmt;
  
  		fmt->format.code = __smiapp_get_mbus_code(subdev, fmt->pad);
  		fmt->format.width = r->width;
  		fmt->format.height = r->height;
  		fmt->format.field = V4L2_FIELD_NONE;
  	}
  
  	return 0;
  }
  
  static int smiapp_get_format(struct v4l2_subdev *subdev,
  			     struct v4l2_subdev_pad_config *cfg,
  			     struct v4l2_subdev_format *fmt)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	int rval;
  
  	mutex_lock(&sensor->mutex);
  	rval = __smiapp_get_format(subdev, cfg, fmt);
  	mutex_unlock(&sensor->mutex);
  
  	return rval;
  }
  
  static void smiapp_get_crop_compose(struct v4l2_subdev *subdev,
  				    struct v4l2_subdev_pad_config *cfg,
  				    struct v4l2_rect **crops,
  				    struct v4l2_rect **comps, int which)
  {
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  	unsigned int i;
  
  	if (which == V4L2_SUBDEV_FORMAT_ACTIVE) {
  		if (crops)
  			for (i = 0; i < subdev->entity.num_pads; i++)
  				crops[i] = &ssd->crop[i];
  		if (comps)
  			*comps = &ssd->compose;
  	} else {
  		if (crops) {
  			for (i = 0; i < subdev->entity.num_pads; i++) {
  				crops[i] = v4l2_subdev_get_try_crop(subdev, cfg, i);
  				BUG_ON(!crops[i]);
  			}
  		}
  		if (comps) {
  			*comps = v4l2_subdev_get_try_compose(subdev, cfg,
  							     SMIAPP_PAD_SINK);
  			BUG_ON(!*comps);
  		}
  	}
  }
  
  /* Changes require propagation only on sink pad. */
  static void smiapp_propagate(struct v4l2_subdev *subdev,
  			     struct v4l2_subdev_pad_config *cfg, int which,
  			     int target)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  	struct v4l2_rect *comp, *crops[SMIAPP_PADS];
  
  	smiapp_get_crop_compose(subdev, cfg, crops, &comp, which);
  
  	switch (target) {
  	case V4L2_SEL_TGT_CROP:
  		comp->width = crops[SMIAPP_PAD_SINK]->width;
  		comp->height = crops[SMIAPP_PAD_SINK]->height;
  		if (which == V4L2_SUBDEV_FORMAT_ACTIVE) {
  			if (ssd == sensor->scaler) {
  				sensor->scale_m =
  					sensor->limits[
  						SMIAPP_LIMIT_SCALER_N_MIN];
  				sensor->scaling_mode =
  					SMIAPP_SCALING_MODE_NONE;
  			} else if (ssd == sensor->binner) {
  				sensor->binning_horizontal = 1;
  				sensor->binning_vertical = 1;
  			}
  		}
  		/* Fall through */
  	case V4L2_SEL_TGT_COMPOSE:
  		*crops[SMIAPP_PAD_SRC] = *comp;
  		break;
  	default:
  		BUG();
  	}
  }
  
  static const struct smiapp_csi_data_format
  *smiapp_validate_csi_data_format(struct smiapp_sensor *sensor, u32 code)
  {
  	const struct smiapp_csi_data_format *csi_format = sensor->csi_format;
  	unsigned int i;
  
  	for (i = 0; i < ARRAY_SIZE(smiapp_csi_data_formats); i++) {
  		if (sensor->mbus_frame_fmts & (1 << i)
  		    && smiapp_csi_data_formats[i].code == code)
  			return &smiapp_csi_data_formats[i];
  	}
  
  	return csi_format;
  }
  
  static int smiapp_set_format_source(struct v4l2_subdev *subdev,
  				    struct v4l2_subdev_pad_config *cfg,
  				    struct v4l2_subdev_format *fmt)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	const struct smiapp_csi_data_format *csi_format,
  		*old_csi_format = sensor->csi_format;
  	unsigned long *valid_link_freqs;
  	u32 code = fmt->format.code;
  	unsigned int i;
  	int rval;
  
  	rval = __smiapp_get_format(subdev, cfg, fmt);
  	if (rval)
  		return rval;
  
  	/*
  	 * Media bus code is changeable on src subdev's source pad. On
  	 * other source pads we just get format here.
  	 */
  	if (subdev != &sensor->src->sd)
  		return 0;
  
  	csi_format = smiapp_validate_csi_data_format(sensor, code);
  
  	fmt->format.code = csi_format->code;
  
  	if (fmt->which != V4L2_SUBDEV_FORMAT_ACTIVE)
  		return 0;
  
  	sensor->csi_format = csi_format;
  
  	if (csi_format->width != old_csi_format->width)
  		for (i = 0; i < ARRAY_SIZE(sensor->test_data); i++)
  			__v4l2_ctrl_modify_range(
  				sensor->test_data[i], 0,
  				(1 << csi_format->width) - 1, 1, 0);
  
  	if (csi_format->compressed == old_csi_format->compressed)
  		return 0;
  
  	valid_link_freqs = 
  		&sensor->valid_link_freqs[sensor->csi_format->compressed
  					  - SMIAPP_COMPRESSED_BASE];
  
  	__v4l2_ctrl_modify_range(
  		sensor->link_freq, 0,
  		__fls(*valid_link_freqs), ~*valid_link_freqs,
  		__ffs(*valid_link_freqs));
  
  	return smiapp_pll_update(sensor);
  }
  
  static int smiapp_set_format(struct v4l2_subdev *subdev,
  			     struct v4l2_subdev_pad_config *cfg,
  			     struct v4l2_subdev_format *fmt)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  	struct v4l2_rect *crops[SMIAPP_PADS];
  
  	mutex_lock(&sensor->mutex);
  
  	if (fmt->pad == ssd->source_pad) {
  		int rval;
  
  		rval = smiapp_set_format_source(subdev, cfg, fmt);
  
  		mutex_unlock(&sensor->mutex);
  
  		return rval;
  	}
  
  	/* Sink pad. Width and height are changeable here. */
  	fmt->format.code = __smiapp_get_mbus_code(subdev, fmt->pad);
  	fmt->format.width &= ~1;
  	fmt->format.height &= ~1;
  	fmt->format.field = V4L2_FIELD_NONE;
  
  	fmt->format.width =
  		clamp(fmt->format.width,
  		      sensor->limits[SMIAPP_LIMIT_MIN_X_OUTPUT_SIZE],
  		      sensor->limits[SMIAPP_LIMIT_MAX_X_OUTPUT_SIZE]);
  	fmt->format.height =
  		clamp(fmt->format.height,
  		      sensor->limits[SMIAPP_LIMIT_MIN_Y_OUTPUT_SIZE],
  		      sensor->limits[SMIAPP_LIMIT_MAX_Y_OUTPUT_SIZE]);
  
  	smiapp_get_crop_compose(subdev, cfg, crops, NULL, fmt->which);
  
  	crops[ssd->sink_pad]->left = 0;
  	crops[ssd->sink_pad]->top = 0;
  	crops[ssd->sink_pad]->width = fmt->format.width;
  	crops[ssd->sink_pad]->height = fmt->format.height;
  	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
  		ssd->sink_fmt = *crops[ssd->sink_pad];
  	smiapp_propagate(subdev, cfg, fmt->which,
  			 V4L2_SEL_TGT_CROP);
  
  	mutex_unlock(&sensor->mutex);
  
  	return 0;
  }
  
  /*
   * Calculate goodness of scaled image size compared to expected image
   * size and flags provided.
   */
  #define SCALING_GOODNESS		100000
  #define SCALING_GOODNESS_EXTREME	100000000
  static int scaling_goodness(struct v4l2_subdev *subdev, int w, int ask_w,
  			    int h, int ask_h, u32 flags)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct i2c_client *client = v4l2_get_subdevdata(subdev);
  	int val = 0;
  
  	w &= ~1;
  	ask_w &= ~1;
  	h &= ~1;
  	ask_h &= ~1;
  
  	if (flags & V4L2_SEL_FLAG_GE) {
  		if (w < ask_w)
  			val -= SCALING_GOODNESS;
  		if (h < ask_h)
  			val -= SCALING_GOODNESS;
  	}
  
  	if (flags & V4L2_SEL_FLAG_LE) {
  		if (w > ask_w)
  			val -= SCALING_GOODNESS;
  		if (h > ask_h)
  			val -= SCALING_GOODNESS;
  	}
  
  	val -= abs(w - ask_w);
  	val -= abs(h - ask_h);
  
  	if (w < sensor->limits[SMIAPP_LIMIT_MIN_X_OUTPUT_SIZE])
  		val -= SCALING_GOODNESS_EXTREME;
  
  	dev_dbg(&client->dev, "w %d ask_w %d h %d ask_h %d goodness %d\n",
  		w, ask_h, h, ask_h, val);
  
  	return val;
  }
  
  static void smiapp_set_compose_binner(struct v4l2_subdev *subdev,
  				      struct v4l2_subdev_pad_config *cfg,
  				      struct v4l2_subdev_selection *sel,
  				      struct v4l2_rect **crops,
  				      struct v4l2_rect *comp)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	unsigned int i;
  	unsigned int binh = 1, binv = 1;
  	int best = scaling_goodness(
  		subdev,
  		crops[SMIAPP_PAD_SINK]->width, sel->r.width,
  		crops[SMIAPP_PAD_SINK]->height, sel->r.height, sel->flags);
  
  	for (i = 0; i < sensor->nbinning_subtypes; i++) {
  		int this = scaling_goodness(
  			subdev,
  			crops[SMIAPP_PAD_SINK]->width
  			/ sensor->binning_subtypes[i].horizontal,
  			sel->r.width,
  			crops[SMIAPP_PAD_SINK]->height
  			/ sensor->binning_subtypes[i].vertical,
  			sel->r.height, sel->flags);
  
  		if (this > best) {
  			binh = sensor->binning_subtypes[i].horizontal;
  			binv = sensor->binning_subtypes[i].vertical;
  			best = this;
  		}
  	}
  	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
  		sensor->binning_vertical = binv;
  		sensor->binning_horizontal = binh;
  	}
  
  	sel->r.width = (crops[SMIAPP_PAD_SINK]->width / binh) & ~1;
  	sel->r.height = (crops[SMIAPP_PAD_SINK]->height / binv) & ~1;
  }
  
  /*
   * Calculate best scaling ratio and mode for given output resolution.
   *
   * Try all of these: horizontal ratio, vertical ratio and smallest
   * size possible (horizontally).
   *
   * Also try whether horizontal scaler or full scaler gives a better
   * result.
   */
  static void smiapp_set_compose_scaler(struct v4l2_subdev *subdev,
  				      struct v4l2_subdev_pad_config *cfg,
  				      struct v4l2_subdev_selection *sel,
  				      struct v4l2_rect **crops,
  				      struct v4l2_rect *comp)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(subdev);
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	u32 min, max, a, b, max_m;
  	u32 scale_m = sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN];
  	int mode = SMIAPP_SCALING_MODE_HORIZONTAL;
  	u32 try[4];
  	u32 ntry = 0;
  	unsigned int i;
  	int best = INT_MIN;
  
  	sel->r.width = min_t(unsigned int, sel->r.width,
  			     crops[SMIAPP_PAD_SINK]->width);
  	sel->r.height = min_t(unsigned int, sel->r.height,
  			      crops[SMIAPP_PAD_SINK]->height);
  
  	a = crops[SMIAPP_PAD_SINK]->width
  		* sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN] / sel->r.width;
  	b = crops[SMIAPP_PAD_SINK]->height
  		* sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN] / sel->r.height;
  	max_m = crops[SMIAPP_PAD_SINK]->width
  		* sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN]
  		/ sensor->limits[SMIAPP_LIMIT_MIN_X_OUTPUT_SIZE];
  
  	a = clamp(a, sensor->limits[SMIAPP_LIMIT_SCALER_M_MIN],
  		  sensor->limits[SMIAPP_LIMIT_SCALER_M_MAX]);
  	b = clamp(b, sensor->limits[SMIAPP_LIMIT_SCALER_M_MIN],
  		  sensor->limits[SMIAPP_LIMIT_SCALER_M_MAX]);
  	max_m = clamp(max_m, sensor->limits[SMIAPP_LIMIT_SCALER_M_MIN],
  		      sensor->limits[SMIAPP_LIMIT_SCALER_M_MAX]);
  
  	dev_dbg(&client->dev, "scaling: a %d b %d max_m %d\n", a, b, max_m);
  
  	min = min(max_m, min(a, b));
  	max = min(max_m, max(a, b));
  
  	try[ntry] = min;
  	ntry++;
  	if (min != max) {
  		try[ntry] = max;
  		ntry++;
  	}
  	if (max != max_m) {
  		try[ntry] = min + 1;
  		ntry++;
  		if (min != max) {
  			try[ntry] = max + 1;
  			ntry++;
  		}
  	}
  
  	for (i = 0; i < ntry; i++) {
  		int this = scaling_goodness(
  			subdev,
  			crops[SMIAPP_PAD_SINK]->width
  			/ try[i]
  			* sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN],
  			sel->r.width,
  			crops[SMIAPP_PAD_SINK]->height,
  			sel->r.height,
  			sel->flags);
  
  		dev_dbg(&client->dev, "trying factor %d (%d)\n", try[i], i);
  
  		if (this > best) {
  			scale_m = try[i];
  			mode = SMIAPP_SCALING_MODE_HORIZONTAL;
  			best = this;
  		}
  
  		if (sensor->limits[SMIAPP_LIMIT_SCALING_CAPABILITY]
  		    == SMIAPP_SCALING_CAPABILITY_HORIZONTAL)
  			continue;
  
  		this = scaling_goodness(
  			subdev, crops[SMIAPP_PAD_SINK]->width
  			/ try[i]
  			* sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN],
  			sel->r.width,
  			crops[SMIAPP_PAD_SINK]->height
  			/ try[i]
  			* sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN],
  			sel->r.height,
  			sel->flags);
  
  		if (this > best) {
  			scale_m = try[i];
  			mode = SMIAPP_SCALING_MODE_BOTH;
  			best = this;
  		}
  	}
  
  	sel->r.width =
  		(crops[SMIAPP_PAD_SINK]->width
  		 / scale_m
  		 * sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN]) & ~1;
  	if (mode == SMIAPP_SCALING_MODE_BOTH)
  		sel->r.height =
  			(crops[SMIAPP_PAD_SINK]->height
  			 / scale_m
  			 * sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN])
  			& ~1;
  	else
  		sel->r.height = crops[SMIAPP_PAD_SINK]->height;
  
  	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
  		sensor->scale_m = scale_m;
  		sensor->scaling_mode = mode;
  	}
  }
  /* We're only called on source pads. This function sets scaling. */
  static int smiapp_set_compose(struct v4l2_subdev *subdev,
  			      struct v4l2_subdev_pad_config *cfg,
  			      struct v4l2_subdev_selection *sel)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  	struct v4l2_rect *comp, *crops[SMIAPP_PADS];
  
  	smiapp_get_crop_compose(subdev, cfg, crops, &comp, sel->which);
  
  	sel->r.top = 0;
  	sel->r.left = 0;
  
  	if (ssd == sensor->binner)
  		smiapp_set_compose_binner(subdev, cfg, sel, crops, comp);
  	else
  		smiapp_set_compose_scaler(subdev, cfg, sel, crops, comp);
  
  	*comp = sel->r;
  	smiapp_propagate(subdev, cfg, sel->which,
  			 V4L2_SEL_TGT_COMPOSE);
  
  	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
  		return smiapp_update_mode(sensor);
  
  	return 0;
  }
  
  static int __smiapp_sel_supported(struct v4l2_subdev *subdev,
  				  struct v4l2_subdev_selection *sel)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  
  	/* We only implement crop in three places. */
  	switch (sel->target) {
  	case V4L2_SEL_TGT_CROP:
  	case V4L2_SEL_TGT_CROP_BOUNDS:
  		if (ssd == sensor->pixel_array
  		    && sel->pad == SMIAPP_PA_PAD_SRC)
  			return 0;
  		if (ssd == sensor->src
  		    && sel->pad == SMIAPP_PAD_SRC)
  			return 0;
  		if (ssd == sensor->scaler
  		    && sel->pad == SMIAPP_PAD_SINK
  		    && sensor->limits[SMIAPP_LIMIT_DIGITAL_CROP_CAPABILITY]
  		    == SMIAPP_DIGITAL_CROP_CAPABILITY_INPUT_CROP)
  			return 0;
  		return -EINVAL;
  	case V4L2_SEL_TGT_NATIVE_SIZE:
  		if (ssd == sensor->pixel_array
  		    && sel->pad == SMIAPP_PA_PAD_SRC)
  			return 0;
  		return -EINVAL;
  	case V4L2_SEL_TGT_COMPOSE:
  	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
  		if (sel->pad == ssd->source_pad)
  			return -EINVAL;
  		if (ssd == sensor->binner)
  			return 0;
  		if (ssd == sensor->scaler
  		    && sensor->limits[SMIAPP_LIMIT_SCALING_CAPABILITY]
  		    != SMIAPP_SCALING_CAPABILITY_NONE)
  			return 0;
  		/* Fall through */
  	default:
  		return -EINVAL;
  	}
  }
  
  static int smiapp_set_crop(struct v4l2_subdev *subdev,
  			   struct v4l2_subdev_pad_config *cfg,
  			   struct v4l2_subdev_selection *sel)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  	struct v4l2_rect *src_size, *crops[SMIAPP_PADS];
  	struct v4l2_rect _r;
  
  	smiapp_get_crop_compose(subdev, cfg, crops, NULL, sel->which);
  
  	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
  		if (sel->pad == ssd->sink_pad)
  			src_size = &ssd->sink_fmt;
  		else
  			src_size = &ssd->compose;
  	} else {
  		if (sel->pad == ssd->sink_pad) {
  			_r.left = 0;
  			_r.top = 0;
  			_r.width = v4l2_subdev_get_try_format(subdev, cfg, sel->pad)
  				->width;
  			_r.height = v4l2_subdev_get_try_format(subdev, cfg, sel->pad)
  				->height;
  			src_size = &_r;
  		} else {
  			src_size =
  				v4l2_subdev_get_try_compose(
  					subdev, cfg, ssd->sink_pad);
  		}
  	}
  
  	if (ssd == sensor->src && sel->pad == SMIAPP_PAD_SRC) {
  		sel->r.left = 0;
  		sel->r.top = 0;
  	}
  
  	sel->r.width = min(sel->r.width, src_size->width);
  	sel->r.height = min(sel->r.height, src_size->height);
  
  	sel->r.left = min_t(int, sel->r.left, src_size->width - sel->r.width);
  	sel->r.top = min_t(int, sel->r.top, src_size->height - sel->r.height);
  
  	*crops[sel->pad] = sel->r;
  
  	if (ssd != sensor->pixel_array && sel->pad == SMIAPP_PAD_SINK)
  		smiapp_propagate(subdev, cfg, sel->which,
  				 V4L2_SEL_TGT_CROP);
  
  	return 0;
  }
  
  static int __smiapp_get_selection(struct v4l2_subdev *subdev,
  				  struct v4l2_subdev_pad_config *cfg,
  				  struct v4l2_subdev_selection *sel)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_subdev *ssd = to_smiapp_subdev(subdev);
  	struct v4l2_rect *comp, *crops[SMIAPP_PADS];
  	struct v4l2_rect sink_fmt;
  	int ret;
  
  	ret = __smiapp_sel_supported(subdev, sel);
  	if (ret)
  		return ret;
  
  	smiapp_get_crop_compose(subdev, cfg, crops, &comp, sel->which);
  
  	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
  		sink_fmt = ssd->sink_fmt;
  	} else {
  		struct v4l2_mbus_framefmt *fmt =
  			v4l2_subdev_get_try_format(subdev, cfg, ssd->sink_pad);
  
  		sink_fmt.left = 0;
  		sink_fmt.top = 0;
  		sink_fmt.width = fmt->width;
  		sink_fmt.height = fmt->height;
  	}
  
  	switch (sel->target) {
  	case V4L2_SEL_TGT_CROP_BOUNDS:
  	case V4L2_SEL_TGT_NATIVE_SIZE:
  		if (ssd == sensor->pixel_array) {
  			sel->r.left = sel->r.top = 0;
  			sel->r.width =
  				sensor->limits[SMIAPP_LIMIT_X_ADDR_MAX] + 1;
  			sel->r.height =
  				sensor->limits[SMIAPP_LIMIT_Y_ADDR_MAX] + 1;
  		} else if (sel->pad == ssd->sink_pad) {
  			sel->r = sink_fmt;
  		} else {
  			sel->r = *comp;
  		}
  		break;
  	case V4L2_SEL_TGT_CROP:
  	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
  		sel->r = *crops[sel->pad];
  		break;
  	case V4L2_SEL_TGT_COMPOSE:
  		sel->r = *comp;
  		break;
  	}
  
  	return 0;
  }
  
  static int smiapp_get_selection(struct v4l2_subdev *subdev,
  				struct v4l2_subdev_pad_config *cfg,
  				struct v4l2_subdev_selection *sel)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	int rval;
  
  	mutex_lock(&sensor->mutex);
  	rval = __smiapp_get_selection(subdev, cfg, sel);
  	mutex_unlock(&sensor->mutex);
  
  	return rval;
  }
  static int smiapp_set_selection(struct v4l2_subdev *subdev,
  				struct v4l2_subdev_pad_config *cfg,
  				struct v4l2_subdev_selection *sel)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	int ret;
  
  	ret = __smiapp_sel_supported(subdev, sel);
  	if (ret)
  		return ret;
  
  	mutex_lock(&sensor->mutex);
  
  	sel->r.left = max(0, sel->r.left & ~1);
  	sel->r.top = max(0, sel->r.top & ~1);
  	sel->r.width = SMIAPP_ALIGN_DIM(sel->r.width, sel->flags);
  	sel->r.height =	SMIAPP_ALIGN_DIM(sel->r.height, sel->flags);
  
  	sel->r.width = max_t(unsigned int,
  			     sensor->limits[SMIAPP_LIMIT_MIN_X_OUTPUT_SIZE],
  			     sel->r.width);
  	sel->r.height = max_t(unsigned int,
  			      sensor->limits[SMIAPP_LIMIT_MIN_Y_OUTPUT_SIZE],
  			      sel->r.height);
  
  	switch (sel->target) {
  	case V4L2_SEL_TGT_CROP:
  		ret = smiapp_set_crop(subdev, cfg, sel);
  		break;
  	case V4L2_SEL_TGT_COMPOSE:
  		ret = smiapp_set_compose(subdev, cfg, sel);
  		break;
  	default:
  		ret = -EINVAL;
  	}
  
  	mutex_unlock(&sensor->mutex);
  	return ret;
  }
  
  static int smiapp_get_skip_frames(struct v4l2_subdev *subdev, u32 *frames)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  
  	*frames = sensor->frame_skip;
  	return 0;
  }
  
  static int smiapp_get_skip_top_lines(struct v4l2_subdev *subdev, u32 *lines)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  
  	*lines = sensor->image_start;
  
  	return 0;
  }
  
  /* -----------------------------------------------------------------------------
   * sysfs attributes
   */
  
  static ssize_t
  smiapp_sysfs_nvm_read(struct device *dev, struct device_attribute *attr,
  		      char *buf)
  {
  	struct v4l2_subdev *subdev = i2c_get_clientdata(to_i2c_client(dev));
  	struct i2c_client *client = v4l2_get_subdevdata(subdev);
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	unsigned int nbytes;
  
  	if (!sensor->dev_init_done)
  		return -EBUSY;
  
  	if (!sensor->nvm_size) {
  		/* NVM not read yet - read it now */
  		sensor->nvm_size = sensor->hwcfg->nvm_size;
  		if (smiapp_set_power(subdev, 1) < 0)
  			return -ENODEV;
  		if (smiapp_read_nvm(sensor, sensor->nvm)) {
  			dev_err(&client->dev, "nvm read failed\n");
  			return -ENODEV;
  		}
  		smiapp_set_power(subdev, 0);
  	}
  	/*
  	 * NVM is still way below a PAGE_SIZE, so we can safely
  	 * assume this for now.
  	 */
  	nbytes = min_t(unsigned int, sensor->nvm_size, PAGE_SIZE);
  	memcpy(buf, sensor->nvm, nbytes);
  
  	return nbytes;
  }
  static DEVICE_ATTR(nvm, S_IRUGO, smiapp_sysfs_nvm_read, NULL);
  
  static ssize_t
  smiapp_sysfs_ident_read(struct device *dev, struct device_attribute *attr,
  			char *buf)
  {
  	struct v4l2_subdev *subdev = i2c_get_clientdata(to_i2c_client(dev));
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct smiapp_module_info *minfo = &sensor->minfo;
  
  	return snprintf(buf, PAGE_SIZE, "%2.2x%4.4x%2.2x\n",
  			minfo->manufacturer_id, minfo->model_id,
  			minfo->revision_number_major) + 1;
  }
  
  static DEVICE_ATTR(ident, S_IRUGO, smiapp_sysfs_ident_read, NULL);
  
  /* -----------------------------------------------------------------------------
   * V4L2 subdev core operations
   */
  
  static int smiapp_identify_module(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	struct smiapp_module_info *minfo = &sensor->minfo;
  	unsigned int i;
  	int rval = 0;
  
  	minfo->name = SMIAPP_NAME;
  
  	/* Module info */
  	rval = smiapp_read_8only(sensor, SMIAPP_REG_U8_MANUFACTURER_ID,
  				 &minfo->manufacturer_id);
  	if (!rval)
  		rval = smiapp_read_8only(sensor, SMIAPP_REG_U16_MODEL_ID,
  					 &minfo->model_id);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_REVISION_NUMBER_MAJOR,
  					 &minfo->revision_number_major);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_REVISION_NUMBER_MINOR,
  					 &minfo->revision_number_minor);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_MODULE_DATE_YEAR,
  					 &minfo->module_year);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_MODULE_DATE_MONTH,
  					 &minfo->module_month);
  	if (!rval)
  		rval = smiapp_read_8only(sensor, SMIAPP_REG_U8_MODULE_DATE_DAY,
  					 &minfo->module_day);
  
  	/* Sensor info */
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_SENSOR_MANUFACTURER_ID,
  					 &minfo->sensor_manufacturer_id);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U16_SENSOR_MODEL_ID,
  					 &minfo->sensor_model_id);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_SENSOR_REVISION_NUMBER,
  					 &minfo->sensor_revision_number);
  	if (!rval)
  		rval = smiapp_read_8only(sensor,
  					 SMIAPP_REG_U8_SENSOR_FIRMWARE_VERSION,
  					 &minfo->sensor_firmware_version);
  
  	/* SMIA */
  	if (!rval)
  		rval = smiapp_read_8only(sensor, SMIAPP_REG_U8_SMIA_VERSION,
  					 &minfo->smia_version);
  	if (!rval)
  		rval = smiapp_read_8only(sensor, SMIAPP_REG_U8_SMIAPP_VERSION,
  					 &minfo->smiapp_version);
  
  	if (rval) {
  		dev_err(&client->dev, "sensor detection failed\n");
  		return -ENODEV;
  	}
  
  	dev_dbg(&client->dev, "module 0x%2.2x-0x%4.4x\n",
  		minfo->manufacturer_id, minfo->model_id);
  
  	dev_dbg(&client->dev,
  		"module revision 0x%2.2x-0x%2.2x date %2.2d-%2.2d-%2.2d\n",
  		minfo->revision_number_major, minfo->revision_number_minor,
  		minfo->module_year, minfo->module_month, minfo->module_day);
  
  	dev_dbg(&client->dev, "sensor 0x%2.2x-0x%4.4x\n",
  		minfo->sensor_manufacturer_id, minfo->sensor_model_id);
  
  	dev_dbg(&client->dev,
  		"sensor revision 0x%2.2x firmware version 0x%2.2x\n",
  		minfo->sensor_revision_number, minfo->sensor_firmware_version);
  
  	dev_dbg(&client->dev, "smia version %2.2d smiapp version %2.2d\n",
  		minfo->smia_version, minfo->smiapp_version);
  
  	/*
  	 * Some modules have bad data in the lvalues below. Hope the
  	 * rvalues have better stuff. The lvalues are module
  	 * parameters whereas the rvalues are sensor parameters.
  	 */
  	if (!minfo->manufacturer_id && !minfo->model_id) {
  		minfo->manufacturer_id = minfo->sensor_manufacturer_id;
  		minfo->model_id = minfo->sensor_model_id;
  		minfo->revision_number_major = minfo->sensor_revision_number;
  	}
  
  	for (i = 0; i < ARRAY_SIZE(smiapp_module_idents); i++) {
  		if (smiapp_module_idents[i].manufacturer_id
  		    != minfo->manufacturer_id)
  			continue;
  		if (smiapp_module_idents[i].model_id != minfo->model_id)
  			continue;
  		if (smiapp_module_idents[i].flags
  		    & SMIAPP_MODULE_IDENT_FLAG_REV_LE) {
  			if (smiapp_module_idents[i].revision_number_major
  			    < minfo->revision_number_major)
  				continue;
  		} else {
  			if (smiapp_module_idents[i].revision_number_major
  			    != minfo->revision_number_major)
  				continue;
  		}
  
  		minfo->name = smiapp_module_idents[i].name;
  		minfo->quirk = smiapp_module_idents[i].quirk;
  		break;
  	}
  
  	if (i >= ARRAY_SIZE(smiapp_module_idents))
  		dev_warn(&client->dev,
  			 "no quirks for this module; let's hope it's fully compliant\n");
  
  	dev_dbg(&client->dev, "the sensor is called %s, ident %2.2x%4.4x%2.2x\n",
  		minfo->name, minfo->manufacturer_id, minfo->model_id,
  		minfo->revision_number_major);
  
  	return 0;
  }
  
  static const struct v4l2_subdev_ops smiapp_ops;
  static const struct v4l2_subdev_internal_ops smiapp_internal_ops;
  static const struct media_entity_operations smiapp_entity_ops;
  
  static int smiapp_register_subdevs(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	struct smiapp_subdev *ssds[] = {
  		sensor->scaler,
  		sensor->binner,
  		sensor->pixel_array,
  	};
  	unsigned int i;
  	int rval;
  
  	for (i = 0; i < SMIAPP_SUBDEVS - 1; i++) {
  		struct smiapp_subdev *this = ssds[i + 1];
  		struct smiapp_subdev *last = ssds[i];
  
  		if (!last)
  			continue;
  
  		rval = media_entity_pads_init(&this->sd.entity,
  					 this->npads, this->pads);
  		if (rval) {
  			dev_err(&client->dev,
  				"media_entity_pads_init failed\n");
  			return rval;
  		}
  
  		rval = v4l2_device_register_subdev(sensor->src->sd.v4l2_dev,
  						   &this->sd);
  		if (rval) {
  			dev_err(&client->dev,
  				"v4l2_device_register_subdev failed\n");
  			return rval;
  		}
  
  		rval = media_create_pad_link(&this->sd.entity,
  					     this->source_pad,
  					     &last->sd.entity,
  					     last->sink_pad,
  					     MEDIA_LNK_FL_ENABLED |
  					     MEDIA_LNK_FL_IMMUTABLE);
  		if (rval) {
  			dev_err(&client->dev,
  				"media_create_pad_link failed\n");
  			return rval;
  		}
  	}
  
  	return 0;
  }
  
  static void smiapp_cleanup(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  
  	device_remove_file(&client->dev, &dev_attr_nvm);
  	device_remove_file(&client->dev, &dev_attr_ident);
  
  	smiapp_free_controls(sensor);
  }
  
  static int smiapp_init(struct smiapp_sensor *sensor)
  {
  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
  	struct smiapp_pll *pll = &sensor->pll;
  	struct smiapp_subdev *last = NULL;
  	unsigned int i;
  	int rval;
  
  	sensor->vana = devm_regulator_get(&client->dev, "vana");
  	if (IS_ERR(sensor->vana)) {
  		dev_err(&client->dev, "could not get regulator for vana\n");
  		return PTR_ERR(sensor->vana);
  	}
  
  	sensor->ext_clk = devm_clk_get(&client->dev, NULL);
  	if (IS_ERR(sensor->ext_clk)) {
  		dev_err(&client->dev, "could not get clock (%ld)\n",
  			PTR_ERR(sensor->ext_clk));
  		return -EPROBE_DEFER;
  	}
  
  	rval = clk_set_rate(sensor->ext_clk,
  			    sensor->hwcfg->ext_clk);
  	if (rval < 0) {
  		dev_err(&client->dev,
  			"unable to set clock freq to %u\n",
  			sensor->hwcfg->ext_clk);
  		return rval;
  	}
  
  	sensor->xshutdown = devm_gpiod_get_optional(&client->dev, "xshutdown",
  						    GPIOD_OUT_LOW);
  	if (IS_ERR(sensor->xshutdown))
  		return PTR_ERR(sensor->xshutdown);
  
  	rval = smiapp_power_on(sensor);
  	if (rval)
  		return -ENODEV;
  
  	rval = smiapp_identify_module(sensor);
  	if (rval) {
  		rval = -ENODEV;
  		goto out_power_off;
  	}
  
  	rval = smiapp_get_all_limits(sensor);
  	if (rval) {
  		rval = -ENODEV;
  		goto out_power_off;
  	}
  
  	/*
  	 * Handle Sensor Module orientation on the board.
  	 *
  	 * The application of H-FLIP and V-FLIP on the sensor is modified by
  	 * the sensor orientation on the board.
  	 *
  	 * For SMIAPP_BOARD_SENSOR_ORIENT_180 the default behaviour is to set
  	 * both H-FLIP and V-FLIP for normal operation which also implies
  	 * that a set/unset operation for user space HFLIP and VFLIP v4l2
  	 * controls will need to be internally inverted.
  	 *
  	 * Rotation also changes the bayer pattern.
  	 */
  	if (sensor->hwcfg->module_board_orient ==
  	    SMIAPP_MODULE_BOARD_ORIENT_180)
  		sensor->hvflip_inv_mask = SMIAPP_IMAGE_ORIENTATION_HFLIP |
  					  SMIAPP_IMAGE_ORIENTATION_VFLIP;
  
  	rval = smiapp_call_quirk(sensor, limits);
  	if (rval) {
  		dev_err(&client->dev, "limits quirks failed\n");
  		goto out_power_off;
  	}
  
  	if (sensor->limits[SMIAPP_LIMIT_BINNING_CAPABILITY]) {
  		u32 val;
  
  		rval = smiapp_read(sensor,
  				   SMIAPP_REG_U8_BINNING_SUBTYPES, &val);
  		if (rval < 0) {
  			rval = -ENODEV;
  			goto out_power_off;
  		}
  		sensor->nbinning_subtypes = min_t(u8, val,
  						  SMIAPP_BINNING_SUBTYPES);
  
  		for (i = 0; i < sensor->nbinning_subtypes; i++) {
  			rval = smiapp_read(
  				sensor, SMIAPP_REG_U8_BINNING_TYPE_n(i), &val);
  			if (rval < 0) {
  				rval = -ENODEV;
  				goto out_power_off;
  			}
  			sensor->binning_subtypes[i] =
  				*(struct smiapp_binning_subtype *)&val;
  
  			dev_dbg(&client->dev, "binning %xx%x\n",
  				sensor->binning_subtypes[i].horizontal,
  				sensor->binning_subtypes[i].vertical);
  		}
  	}
  	sensor->binning_horizontal = 1;
  	sensor->binning_vertical = 1;
  
  	if (device_create_file(&client->dev, &dev_attr_ident) != 0) {
  		dev_err(&client->dev, "sysfs ident entry creation failed\n");
  		rval = -ENOENT;
  		goto out_power_off;
  	}
  	/* SMIA++ NVM initialization - it will be read from the sensor
  	 * when it is first requested by userspace.
  	 */
  	if (sensor->minfo.smiapp_version && sensor->hwcfg->nvm_size) {
  		sensor->nvm = devm_kzalloc(&client->dev,
  				sensor->hwcfg->nvm_size, GFP_KERNEL);
  		if (sensor->nvm == NULL) {
  			dev_err(&client->dev, "nvm buf allocation failed\n");
  			rval = -ENOMEM;
  			goto out_cleanup;
  		}
  
  		if (device_create_file(&client->dev, &dev_attr_nvm) != 0) {
  			dev_err(&client->dev, "sysfs nvm entry failed\n");
  			rval = -EBUSY;
  			goto out_cleanup;
  		}
  	}
  
  	/* We consider this as profile 0 sensor if any of these are zero. */
  	if (!sensor->limits[SMIAPP_LIMIT_MIN_OP_SYS_CLK_DIV] ||
  	    !sensor->limits[SMIAPP_LIMIT_MAX_OP_SYS_CLK_DIV] ||
  	    !sensor->limits[SMIAPP_LIMIT_MIN_OP_PIX_CLK_DIV] ||
  	    !sensor->limits[SMIAPP_LIMIT_MAX_OP_PIX_CLK_DIV]) {
  		sensor->minfo.smiapp_profile = SMIAPP_PROFILE_0;
  	} else if (sensor->limits[SMIAPP_LIMIT_SCALING_CAPABILITY]
  		   != SMIAPP_SCALING_CAPABILITY_NONE) {
  		if (sensor->limits[SMIAPP_LIMIT_SCALING_CAPABILITY]
  		    == SMIAPP_SCALING_CAPABILITY_HORIZONTAL)
  			sensor->minfo.smiapp_profile = SMIAPP_PROFILE_1;
  		else
  			sensor->minfo.smiapp_profile = SMIAPP_PROFILE_2;
  		sensor->scaler = &sensor->ssds[sensor->ssds_used];
  		sensor->ssds_used++;
  	} else if (sensor->limits[SMIAPP_LIMIT_DIGITAL_CROP_CAPABILITY]
  		   == SMIAPP_DIGITAL_CROP_CAPABILITY_INPUT_CROP) {
  		sensor->scaler = &sensor->ssds[sensor->ssds_used];
  		sensor->ssds_used++;
  	}
  	sensor->binner = &sensor->ssds[sensor->ssds_used];
  	sensor->ssds_used++;
  	sensor->pixel_array = &sensor->ssds[sensor->ssds_used];
  	sensor->ssds_used++;
  
  	sensor->scale_m = sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN];
  
  	/* prepare PLL configuration input values */
  	pll->bus_type = SMIAPP_PLL_BUS_TYPE_CSI2;
  	pll->csi2.lanes = sensor->hwcfg->lanes;
  	pll->ext_clk_freq_hz = sensor->hwcfg->ext_clk;
  	pll->scale_n = sensor->limits[SMIAPP_LIMIT_SCALER_N_MIN];
  	/* Profile 0 sensors have no separate OP clock branch. */
  	if (sensor->minfo.smiapp_profile == SMIAPP_PROFILE_0)
  		pll->flags |= SMIAPP_PLL_FLAG_NO_OP_CLOCKS;
  
  	for (i = 0; i < SMIAPP_SUBDEVS; i++) {
  		struct {
  			struct smiapp_subdev *ssd;
  			char *name;
  		} const __this[] = {
  			{ sensor->scaler, "scaler", },
  			{ sensor->binner, "binner", },
  			{ sensor->pixel_array, "pixel array", },
  		}, *_this = &__this[i];
  		struct smiapp_subdev *this = _this->ssd;
  
  		if (!this)
  			continue;
  
  		if (this != sensor->src)
  			v4l2_subdev_init(&this->sd, &smiapp_ops);
  
  		this->sensor = sensor;
  
  		if (this == sensor->pixel_array) {
  			this->npads = 1;
  		} else {
  			this->npads = 2;
  			this->source_pad = 1;
  		}
  
  		snprintf(this->sd.name,
  			 sizeof(this->sd.name), "%s %s %d-%4.4x",
  			 sensor->minfo.name, _this->name,
  			 i2c_adapter_id(client->adapter), client->addr);
  
  		this->sink_fmt.width =
  			sensor->limits[SMIAPP_LIMIT_X_ADDR_MAX] + 1;
  		this->sink_fmt.height =
  			sensor->limits[SMIAPP_LIMIT_Y_ADDR_MAX] + 1;
  		this->compose.width = this->sink_fmt.width;
  		this->compose.height = this->sink_fmt.height;
  		this->crop[this->source_pad] = this->compose;
  		this->pads[this->source_pad].flags = MEDIA_PAD_FL_SOURCE;
  		if (this != sensor->pixel_array) {
  			this->crop[this->sink_pad] = this->compose;
  			this->pads[this->sink_pad].flags = MEDIA_PAD_FL_SINK;
  		}
  
  		this->sd.entity.ops = &smiapp_entity_ops;
  
  		if (last == NULL) {
  			last = this;
  			continue;
  		}
  
  		this->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
  		this->sd.internal_ops = &smiapp_internal_ops;
  		this->sd.owner = THIS_MODULE;
  		v4l2_set_subdevdata(&this->sd, client);
  
  		last = this;
  	}
  
  	dev_dbg(&client->dev, "profile %d\n", sensor->minfo.smiapp_profile);
  
  	sensor->pixel_array->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
  
  	/* final steps */
  	smiapp_read_frame_fmt(sensor);
  	rval = smiapp_init_controls(sensor);
  	if (rval < 0)
  		goto out_cleanup;
  
  	rval = smiapp_call_quirk(sensor, init);
  	if (rval)
  		goto out_cleanup;
  
  	rval = smiapp_get_mbus_formats(sensor);
  	if (rval) {
  		rval = -ENODEV;
  		goto out_cleanup;
  	}
  
  	rval = smiapp_init_late_controls(sensor);
  	if (rval) {
  		rval = -ENODEV;
  		goto out_cleanup;
  	}
  
  	mutex_lock(&sensor->mutex);
  	rval = smiapp_update_mode(sensor);
  	mutex_unlock(&sensor->mutex);
  	if (rval) {
  		dev_err(&client->dev, "update mode failed\n");
  		goto out_cleanup;
  	}
  
  	sensor->streaming = false;
  	sensor->dev_init_done = true;
  
  	smiapp_power_off(sensor);
  
  	return 0;
  
  out_cleanup:
  	smiapp_cleanup(sensor);
  
  out_power_off:
  	smiapp_power_off(sensor);
  	return rval;
  }
  
  static int smiapp_registered(struct v4l2_subdev *subdev)
  {
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	struct i2c_client *client = v4l2_get_subdevdata(subdev);
  	int rval;
  
  	if (!client->dev.of_node) {
  		rval = smiapp_init(sensor);
  		if (rval)
  			return rval;
  	}
  
  	rval = smiapp_register_subdevs(sensor);
  	if (rval)
  		smiapp_cleanup(sensor);
  
  	return rval;
  }
  
  static int smiapp_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
  {
  	struct smiapp_subdev *ssd = to_smiapp_subdev(sd);
  	struct smiapp_sensor *sensor = ssd->sensor;
  	u32 mbus_code =
  		smiapp_csi_data_formats[smiapp_pixel_order(sensor)].code;
  	unsigned int i;
  
  	mutex_lock(&sensor->mutex);
  
  	for (i = 0; i < ssd->npads; i++) {
  		struct v4l2_mbus_framefmt *try_fmt =
  			v4l2_subdev_get_try_format(sd, fh->pad, i);
  		struct v4l2_rect *try_crop = v4l2_subdev_get_try_crop(sd, fh->pad, i);
  		struct v4l2_rect *try_comp;
  
  		try_fmt->width = sensor->limits[SMIAPP_LIMIT_X_ADDR_MAX] + 1;
  		try_fmt->height = sensor->limits[SMIAPP_LIMIT_Y_ADDR_MAX] + 1;
  		try_fmt->code = mbus_code;
  		try_fmt->field = V4L2_FIELD_NONE;
  
  		try_crop->top = 0;
  		try_crop->left = 0;
  		try_crop->width = try_fmt->width;
  		try_crop->height = try_fmt->height;
  
  		if (ssd != sensor->pixel_array)
  			continue;
  
  		try_comp = v4l2_subdev_get_try_compose(sd, fh->pad, i);
  		*try_comp = *try_crop;
  	}
  
  	mutex_unlock(&sensor->mutex);
  
  	return smiapp_set_power(sd, 1);
  }
  
  static int smiapp_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
  {
  	return smiapp_set_power(sd, 0);
  }
  
  static const struct v4l2_subdev_video_ops smiapp_video_ops = {
  	.s_stream = smiapp_set_stream,
  };
  
  static const struct v4l2_subdev_core_ops smiapp_core_ops = {
  	.s_power = smiapp_set_power,
  };
  
  static const struct v4l2_subdev_pad_ops smiapp_pad_ops = {
  	.enum_mbus_code = smiapp_enum_mbus_code,
  	.get_fmt = smiapp_get_format,
  	.set_fmt = smiapp_set_format,
  	.get_selection = smiapp_get_selection,
  	.set_selection = smiapp_set_selection,
  };
  
  static const struct v4l2_subdev_sensor_ops smiapp_sensor_ops = {
  	.g_skip_frames = smiapp_get_skip_frames,
  	.g_skip_top_lines = smiapp_get_skip_top_lines,
  };
  
  static const struct v4l2_subdev_ops smiapp_ops = {
  	.core = &smiapp_core_ops,
  	.video = &smiapp_video_ops,
  	.pad = &smiapp_pad_ops,
  	.sensor = &smiapp_sensor_ops,
  };
  
  static const struct media_entity_operations smiapp_entity_ops = {
  	.link_validate = v4l2_subdev_link_validate,
  };
  
  static const struct v4l2_subdev_internal_ops smiapp_internal_src_ops = {
  	.registered = smiapp_registered,
  	.open = smiapp_open,
  	.close = smiapp_close,
  };
  
  static const struct v4l2_subdev_internal_ops smiapp_internal_ops = {
  	.open = smiapp_open,
  	.close = smiapp_close,
  };
  
  /* -----------------------------------------------------------------------------
   * I2C Driver
   */
  
  #ifdef CONFIG_PM
  
  static int smiapp_suspend(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	bool streaming;
  
  	BUG_ON(mutex_is_locked(&sensor->mutex));
  
  	if (sensor->power_count == 0)
  		return 0;
  
  	if (sensor->streaming)
  		smiapp_stop_streaming(sensor);
  
  	streaming = sensor->streaming;
  
  	smiapp_power_off(sensor);
  
  	/* save state for resume */
  	sensor->streaming = streaming;
  
  	return 0;
  }
  
  static int smiapp_resume(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	int rval;
  
  	if (sensor->power_count == 0)
  		return 0;
  
  	rval = smiapp_power_on(sensor);
  	if (rval)
  		return rval;
  
  	if (sensor->streaming)
  		rval = smiapp_start_streaming(sensor);
  
  	return rval;
  }
  
  #else
  
  #define smiapp_suspend	NULL
  #define smiapp_resume	NULL
  
  #endif /* CONFIG_PM */
  
  static struct smiapp_hwconfig *smiapp_get_hwconfig(struct device *dev)
  {
  	struct smiapp_hwconfig *hwcfg;
  	struct v4l2_of_endpoint *bus_cfg;
  	struct device_node *ep;
  	int i;
  	int rval;
  
  	if (!dev->of_node)
  		return dev->platform_data;
  
  	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
  	if (!ep)
  		return NULL;
  
  	bus_cfg = v4l2_of_alloc_parse_endpoint(ep);
  	if (IS_ERR(bus_cfg))
  		goto out_err;
  
  	hwcfg = devm_kzalloc(dev, sizeof(*hwcfg), GFP_KERNEL);
  	if (!hwcfg)
  		goto out_err;
  
  	switch (bus_cfg->bus_type) {
  	case V4L2_MBUS_CSI2:
  		hwcfg->csi_signalling_mode = SMIAPP_CSI_SIGNALLING_MODE_CSI2;
  		break;
  		/* FIXME: add CCP2 support. */
  	default:
  		goto out_err;
  	}
  
  	hwcfg->lanes = bus_cfg->bus.mipi_csi2.num_data_lanes;
  	dev_dbg(dev, "lanes %u\n", hwcfg->lanes);
  
  	/* NVM size is not mandatory */
  	of_property_read_u32(dev->of_node, "nokia,nvm-size",
  				    &hwcfg->nvm_size);
  
  	rval = of_property_read_u32(dev->of_node, "clock-frequency",
  				    &hwcfg->ext_clk);
  	if (rval) {
  		dev_warn(dev, "can't get clock-frequency\n");
  		goto out_err;
  	}
  
  	dev_dbg(dev, "nvm %d, clk %d, csi %d\n", hwcfg->nvm_size,
  		hwcfg->ext_clk, hwcfg->csi_signalling_mode);
  
  	if (!bus_cfg->nr_of_link_frequencies) {
  		dev_warn(dev, "no link frequencies defined\n");
  		goto out_err;
  	}
  
  	hwcfg->op_sys_clock = devm_kcalloc(
  		dev, bus_cfg->nr_of_link_frequencies + 1 /* guardian */,
  		sizeof(*hwcfg->op_sys_clock), GFP_KERNEL);
  	if (!hwcfg->op_sys_clock)
  		goto out_err;
  
  	for (i = 0; i < bus_cfg->nr_of_link_frequencies; i++) {
  		hwcfg->op_sys_clock[i] = bus_cfg->link_frequencies[i];
  		dev_dbg(dev, "freq %d: %lld\n", i, hwcfg->op_sys_clock[i]);
  	}
  
  	v4l2_of_free_endpoint(bus_cfg);
  	of_node_put(ep);
  	return hwcfg;
  
  out_err:
  	v4l2_of_free_endpoint(bus_cfg);
  	of_node_put(ep);
  	return NULL;
  }
  
  static int smiapp_probe(struct i2c_client *client,
  			const struct i2c_device_id *devid)
  {
  	struct smiapp_sensor *sensor;
  	struct smiapp_hwconfig *hwcfg = smiapp_get_hwconfig(&client->dev);
  	int rval;
  
  	if (hwcfg == NULL)
  		return -ENODEV;
  
  	sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
  	if (sensor == NULL)
  		return -ENOMEM;
  
  	sensor->hwcfg = hwcfg;
  	mutex_init(&sensor->mutex);
  	mutex_init(&sensor->power_mutex);
  	sensor->src = &sensor->ssds[sensor->ssds_used];
  
  	v4l2_i2c_subdev_init(&sensor->src->sd, client, &smiapp_ops);
  	sensor->src->sd.internal_ops = &smiapp_internal_src_ops;
  	sensor->src->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
  	sensor->src->sensor = sensor;
  
  	sensor->src->pads[0].flags = MEDIA_PAD_FL_SOURCE;
  	rval = media_entity_pads_init(&sensor->src->sd.entity, 2,
  				 sensor->src->pads);
  	if (rval < 0)
  		return rval;
  
  	if (client->dev.of_node) {
  		rval = smiapp_init(sensor);
  		if (rval)
  			goto out_media_entity_cleanup;
  	}
  
  	rval = v4l2_async_register_subdev(&sensor->src->sd);
  	if (rval < 0)
  		goto out_media_entity_cleanup;
  
  	return 0;
  
  out_media_entity_cleanup:
  	media_entity_cleanup(&sensor->src->sd.entity);
  
  	return rval;
  }
  
  static int smiapp_remove(struct i2c_client *client)
  {
  	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
  	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
  	unsigned int i;
  
  	v4l2_async_unregister_subdev(subdev);
  
  	if (sensor->power_count) {
  		gpiod_set_value(sensor->xshutdown, 0);
  		clk_disable_unprepare(sensor->ext_clk);
  		sensor->power_count = 0;
  	}
  
  	for (i = 0; i < sensor->ssds_used; i++) {
  		v4l2_device_unregister_subdev(&sensor->ssds[i].sd);
  		media_entity_cleanup(&sensor->ssds[i].sd.entity);
  	}
  	smiapp_cleanup(sensor);
  
  	return 0;
  }
  
  static const struct of_device_id smiapp_of_table[] = {
  	{ .compatible = "nokia,smia" },
  	{ },
  };
  MODULE_DEVICE_TABLE(of, smiapp_of_table);
  
  static const struct i2c_device_id smiapp_id_table[] = {
  	{ SMIAPP_NAME, 0 },
  	{ },
  };
  MODULE_DEVICE_TABLE(i2c, smiapp_id_table);
  
  static const struct dev_pm_ops smiapp_pm_ops = {
  	.suspend	= smiapp_suspend,
  	.resume		= smiapp_resume,
  };
  
  static struct i2c_driver smiapp_i2c_driver = {
  	.driver	= {
  		.of_match_table = smiapp_of_table,
  		.name = SMIAPP_NAME,
  		.pm = &smiapp_pm_ops,
  	},
  	.probe	= smiapp_probe,
  	.remove	= smiapp_remove,
  	.id_table = smiapp_id_table,
  };
  
  module_i2c_driver(smiapp_i2c_driver);
  
  MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
  MODULE_DESCRIPTION("Generic SMIA/SMIA++ camera module driver");
  MODULE_LICENSE("GPL");
  