[linux-block.git] / include / media / soc_camera.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * camera image capture (abstract) bus driver header
 *
 * Copyright (C) 2006, Sascha Hauer, Pengutronix
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 */

#ifndef SOC_CAMERA_H
#define SOC_CAMERA_H

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/videodev2.h>
#include <media/videobuf2-v4l2.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>

struct file;
struct soc_camera_desc;
struct soc_camera_async_client;

struct soc_camera_device {
	struct list_head list;		/* list of all registered devices */
	struct soc_camera_desc *sdesc;
	struct device *pdev;		/* Platform device */
	struct device *parent;		/* Camera host device */
	struct device *control;		/* E.g., the i2c client */
	s32 user_width;
	s32 user_height;
	u32 bytesperline;		/* for padding, zero if unused */
	u32 sizeimage;
	enum v4l2_colorspace colorspace;
	unsigned char iface;		/* Host number */
	unsigned char devnum;		/* Device number per host */
	struct soc_camera_sense *sense;	/* See comment in struct definition */
	struct video_device *vdev;
	struct v4l2_ctrl_handler ctrl_handler;
	const struct soc_camera_format_xlate *current_fmt;
	struct soc_camera_format_xlate *user_formats;
	int num_user_formats;
	enum v4l2_field field;		/* Preserve field over close() */
	void *host_priv;		/* Per-device host private data */
	/* soc_camera.c private count. Only accessed with .host_lock held */
	int use_count;
	struct file *streamer;		/* stream owner */
	struct v4l2_clk *clk;
	/* Asynchronous subdevice management */
	struct soc_camera_async_client *sasc;
	/* video buffer queue */
	struct vb2_queue vb2_vidq;
};

/* Host supports programmable stride */
#define SOCAM_HOST_CAP_STRIDE		(1 << 0)

enum soc_camera_subdev_role {
	SOCAM_SUBDEV_DATA_SOURCE = 1,
	SOCAM_SUBDEV_DATA_SINK,
	SOCAM_SUBDEV_DATA_PROCESSOR,
};

struct soc_camera_async_subdev {
	struct v4l2_async_subdev asd;
	enum soc_camera_subdev_role role;
};

struct soc_camera_host {
	struct v4l2_device v4l2_dev;
	struct list_head list;
	struct mutex host_lock;		/* Main synchronisation lock */
	struct mutex clk_lock;		/* Protect pipeline modifications */
	unsigned char nr;		/* Host number */
	u32 capabilities;
	struct soc_camera_device *icd;	/* Currently attached client */
	void *priv;
	const char *drv_name;
	struct soc_camera_host_ops *ops;
	struct v4l2_async_subdev **asd;	/* Flat array, arranged in groups */
	unsigned int *asd_sizes;	/* 0-terminated array of asd group sizes */
};

struct soc_camera_host_ops {
	struct module *owner;
	int (*add)(struct soc_camera_device *);
	void (*remove)(struct soc_camera_device *);
	int (*clock_start)(struct soc_camera_host *);
	void (*clock_stop)(struct soc_camera_host *);
	/*
	 * .get_formats() is called for each client device format, but
	 * .put_formats() is only called once. Further, if any of the calls to
	 * .get_formats() fail, .put_formats() will not be called at all, the
	 * failing .get_formats() must then clean up internally.
	 */
	int (*get_formats)(struct soc_camera_device *, unsigned int,
			   struct soc_camera_format_xlate *);
	void (*put_formats)(struct soc_camera_device *);
	int (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
	int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
	/*
	 * The difference to .set_selection() is, that .set_liveselection is not allowed
	 * to change the output sizes
	 */
	int (*set_liveselection)(struct soc_camera_device *, struct v4l2_selection *);
	int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
	int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
	int (*init_videobuf2)(struct vb2_queue *,
			      struct soc_camera_device *);
	int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
	int (*set_bus_param)(struct soc_camera_device *);
	int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
	int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
	int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
	__poll_t (*poll)(struct file *, poll_table *);
};

#define SOCAM_SENSOR_INVERT_PCLK	(1 << 0)
#define SOCAM_SENSOR_INVERT_MCLK	(1 << 1)
#define SOCAM_SENSOR_INVERT_HSYNC	(1 << 2)
#define SOCAM_SENSOR_INVERT_VSYNC	(1 << 3)
#define SOCAM_SENSOR_INVERT_DATA	(1 << 4)

struct i2c_board_info;
struct regulator_bulk_data;

struct soc_camera_subdev_desc {
	/* Per camera SOCAM_SENSOR_* bus flags */
	unsigned long flags;

	/* sensor driver private platform data */
	void *drv_priv;

	/*
	 * Set unbalanced_power to true to deal with legacy drivers, failing to
	 * balance their calls to subdevice's .s_power() method. clock_state is
	 * then used internally by helper functions, it shouldn't be touched by
	 * drivers or the platform code.
	 */
	bool unbalanced_power;
	unsigned long clock_state;

	/* Optional callbacks to power on or off and reset the sensor */
	int (*power)(struct device *, int);
	int (*reset)(struct device *);

	/*
	 * some platforms may support different data widths than the sensors
	 * native ones due to different data line routing. Let the board code
	 * overwrite the width flags.
	 */
	int (*set_bus_param)(struct soc_camera_subdev_desc *, unsigned long flags);
	unsigned long (*query_bus_param)(struct soc_camera_subdev_desc *);
	void (*free_bus)(struct soc_camera_subdev_desc *);

	/* Optional regulators that have to be managed on power on/off events */
	struct v4l2_subdev_platform_data sd_pdata;
};

struct soc_camera_host_desc {
	/* Camera bus id, used to match a camera and a bus */
	int bus_id;
	int i2c_adapter_id;
	struct i2c_board_info *board_info;
	const char *module_name;

	/*
	 * For non-I2C devices platform has to provide methods to add a device
	 * to the system and to remove it
	 */
	int (*add_device)(struct soc_camera_device *);
	void (*del_device)(struct soc_camera_device *);
};

/*
 * Platform data for "soc-camera-pdrv"
 * This MUST be kept binary-identical to struct soc_camera_link below, until
 * it is completely replaced by this one, after which we can split it into its
 * two components.
 */
struct soc_camera_desc {
	struct soc_camera_subdev_desc subdev_desc;
	struct soc_camera_host_desc host_desc;
};

/* Prepare to replace this struct: don't change its layout any more! */
struct soc_camera_link {
	/*
	 * Subdevice part - keep at top and compatible to
	 * struct soc_camera_subdev_desc
	 */

	/* Per camera SOCAM_SENSOR_* bus flags */
	unsigned long flags;

	void *priv;

	/* Set by platforms to handle misbehaving drivers */
	bool unbalanced_power;
	/* Used by soc-camera helper functions */
	unsigned long clock_state;

	/* Optional callbacks to power on or off and reset the sensor */
	int (*power)(struct device *, int);
	int (*reset)(struct device *);
	/*
	 * some platforms may support different data widths than the sensors
	 * native ones due to different data line routing. Let the board code
	 * overwrite the width flags.
	 */
	int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
	unsigned long (*query_bus_param)(struct soc_camera_link *);
	void (*free_bus)(struct soc_camera_link *);

	/* Optional regulators that have to be managed on power on/off events */
	struct regulator_bulk_data *regulators;
	int num_regulators;

	void *host_priv;

	/*
	 * Host part - keep at bottom and compatible to
	 * struct soc_camera_host_desc
	 */

	/* Camera bus id, used to match a camera and a bus */
	int bus_id;
	int i2c_adapter_id;
	struct i2c_board_info *board_info;
	const char *module_name;

	/*
	 * For non-I2C devices platform has to provide methods to add a device
	 * to the system and to remove it
	 */
	int (*add_device)(struct soc_camera_device *);
	void (*del_device)(struct soc_camera_device *);
};

static inline struct soc_camera_host *to_soc_camera_host(
	const struct device *dev)
{
	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);

	return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
}

static inline struct soc_camera_desc *to_soc_camera_desc(
	const struct soc_camera_device *icd)
{
	return icd->sdesc;
}

static inline struct device *to_soc_camera_control(
	const struct soc_camera_device *icd)
{
	return icd->control;
}

static inline struct v4l2_subdev *soc_camera_to_subdev(
	const struct soc_camera_device *icd)
{
	struct device *control = to_soc_camera_control(icd);
	return dev_get_drvdata(control);
}

int soc_camera_host_register(struct soc_camera_host *ici);
void soc_camera_host_unregister(struct soc_camera_host *ici);

const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
	struct soc_camera_device *icd, unsigned int fourcc);

/**
 * struct soc_camera_format_xlate - match between host and sensor formats
 * @code: code of a sensor provided format
 * @host_fmt: host format after host translation from code
 *
 * Host and sensor translation structure. Used in table of host and sensor
 * formats matchings in soc_camera_device. A host can override the generic list
 * generation by implementing get_formats(), and use it for format checks and
 * format setup.
 */
struct soc_camera_format_xlate {
	u32 code;
	const struct soc_mbus_pixelfmt *host_fmt;
};

#define SOCAM_SENSE_PCLK_CHANGED	(1 << 0)

/**
 * This struct can be attached to struct soc_camera_device by the host driver
 * to request sense from the camera, for example, when calling .set_fmt(). The
 * host then can check which flags are set and verify respective values if any.
 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 * changed during this operation. After completion the host should detach sense.
 *
 * @flags		ored SOCAM_SENSE_* flags
 * @master_clock	if the host wants to be informed about pixel-clock
 *			change, it better set master_clock.
 * @pixel_clock_max	maximum pixel clock frequency supported by the host,
 *			camera is not allowed to exceed this.
 * @pixel_clock		if the camera driver changed pixel clock during this
 *			operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 *			master_clock to calculate the new pixel-clock and
 *			sets this field.
 */
struct soc_camera_sense {
	unsigned long flags;
	unsigned long master_clock;
	unsigned long pixel_clock_max;
	unsigned long pixel_clock;
};

#define SOCAM_DATAWIDTH(x)	BIT((x) - 1)
#define SOCAM_DATAWIDTH_4	SOCAM_DATAWIDTH(4)
#define SOCAM_DATAWIDTH_8	SOCAM_DATAWIDTH(8)
#define SOCAM_DATAWIDTH_9	SOCAM_DATAWIDTH(9)
#define SOCAM_DATAWIDTH_10	SOCAM_DATAWIDTH(10)
#define SOCAM_DATAWIDTH_12	SOCAM_DATAWIDTH(12)
#define SOCAM_DATAWIDTH_15	SOCAM_DATAWIDTH(15)
#define SOCAM_DATAWIDTH_16	SOCAM_DATAWIDTH(16)
#define SOCAM_DATAWIDTH_18	SOCAM_DATAWIDTH(18)
#define SOCAM_DATAWIDTH_24	SOCAM_DATAWIDTH(24)

#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
			      SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
			      SOCAM_DATAWIDTH_12 | SOCAM_DATAWIDTH_15 | \
			      SOCAM_DATAWIDTH_16 | SOCAM_DATAWIDTH_18 | \
			      SOCAM_DATAWIDTH_24)

static inline void soc_camera_limit_side(int *start, int *length,
		unsigned int start_min,
		unsigned int length_min, unsigned int length_max)
{
	if (*length < length_min)
		*length = length_min;
	else if (*length > length_max)
		*length = length_max;

	if (*start < start_min)
		*start = start_min;
	else if (*start > start_min + length_max - *length)
		*start = start_min + length_max - *length;
}

unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
					   const struct v4l2_mbus_config *cfg);

int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd);
int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
			struct v4l2_clk *clk);
int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
			 struct v4l2_clk *clk);

static inline int soc_camera_set_power(struct device *dev,
		struct soc_camera_subdev_desc *ssdd, struct v4l2_clk *clk, bool on)
{
	return on ? soc_camera_power_on(dev, ssdd, clk)
		  : soc_camera_power_off(dev, ssdd, clk);
}

/* This is only temporary here - until v4l2-subdev begins to link to video_device */
#include <linux/i2c.h>
static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
	return icd ? icd->vdev : NULL;
}

static inline struct soc_camera_subdev_desc *soc_camera_i2c_to_desc(const struct i2c_client *client)
{
	return client->dev.platform_data;
}

static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(struct video_device *vdev)
{
	struct soc_camera_device *icd = video_get_drvdata(vdev);
	return soc_camera_to_subdev(icd);
}

static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
{
	return container_of(vq, struct soc_camera_device, vb2_vidq);
}

static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
{
	return (icd->iface << 8) | (icd->devnum + 1);
}

void soc_camera_lock(struct vb2_queue *vq);
void soc_camera_unlock(struct vb2_queue *vq);

#endif
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0-only */
	2	/*
	3	* camera image capture (abstract) bus driver header
	4	*
	5	* Copyright (C) 2006, Sascha Hauer, Pengutronix
	6	* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
	7	*/
	8
	9	#ifndef SOC_CAMERA_H
	10	#define SOC_CAMERA_H
	11
	12	#include <linux/bitops.h>
	13	#include <linux/device.h>
	14	#include <linux/mutex.h>
	15	#include <linux/pm.h>
	16	#include <linux/videodev2.h>
	17	#include <media/videobuf2-v4l2.h>
	18	#include <media/v4l2-async.h>
	19	#include <media/v4l2-ctrls.h>
	20	#include <media/v4l2-device.h>
	21
	22	struct file;
	23	struct soc_camera_desc;
	24	struct soc_camera_async_client;
	25
	26	struct soc_camera_device {
	27	struct list_head list; /* list of all registered devices */
	28	struct soc_camera_desc *sdesc;
	29	struct device pdev; / Platform device */
	30	struct device parent; / Camera host device */
	31	struct device control; / E.g., the i2c client */
	32	s32 user_width;
	33	s32 user_height;
	34	u32 bytesperline; /* for padding, zero if unused */
	35	u32 sizeimage;
	36	enum v4l2_colorspace colorspace;
	37	unsigned char iface; /* Host number */
	38	unsigned char devnum; /* Device number per host */
	39	struct soc_camera_sense sense; / See comment in struct definition */
	40	struct video_device *vdev;
	41	struct v4l2_ctrl_handler ctrl_handler;
	42	const struct soc_camera_format_xlate *current_fmt;
	43	struct soc_camera_format_xlate *user_formats;
	44	int num_user_formats;
	45	enum v4l2_field field; /* Preserve field over close() */
	46	void host_priv; / Per-device host private data */
	47	/* soc_camera.c private count. Only accessed with .host_lock held */
	48	int use_count;
	49	struct file streamer; / stream owner */
	50	struct v4l2_clk *clk;
	51	/* Asynchronous subdevice management */
	52	struct soc_camera_async_client *sasc;
	53	/* video buffer queue */
	54	struct vb2_queue vb2_vidq;
	55	};
	56
	57	/* Host supports programmable stride */
	58	#define SOCAM_HOST_CAP_STRIDE (1 << 0)
	59
	60	enum soc_camera_subdev_role {
	61	SOCAM_SUBDEV_DATA_SOURCE = 1,
	62	SOCAM_SUBDEV_DATA_SINK,
	63	SOCAM_SUBDEV_DATA_PROCESSOR,
	64	};
	65
	66	struct soc_camera_async_subdev {
	67	struct v4l2_async_subdev asd;
	68	enum soc_camera_subdev_role role;
	69	};
	70
	71	struct soc_camera_host {
	72	struct v4l2_device v4l2_dev;
	73	struct list_head list;
	74	struct mutex host_lock; /* Main synchronisation lock */
	75	struct mutex clk_lock; /* Protect pipeline modifications */
	76	unsigned char nr; /* Host number */
	77	u32 capabilities;
	78	struct soc_camera_device icd; / Currently attached client */
	79	void *priv;
	80	const char *drv_name;
	81	struct soc_camera_host_ops *ops;
	82	struct v4l2_async_subdev *asd; / Flat array, arranged in groups */
	83	unsigned int asd_sizes; / 0-terminated array of asd group sizes */
	84	};
	85
	86	struct soc_camera_host_ops {
	87	struct module *owner;
	88	int (add)(struct soc_camera_device );
	89	void (remove)(struct soc_camera_device );
	90	int (clock_start)(struct soc_camera_host );
	91	void (clock_stop)(struct soc_camera_host );
	92	/*
	93	* .get_formats() is called for each client device format, but
	94	* .put_formats() is only called once. Further, if any of the calls to
	95	* .get_formats() fail, .put_formats() will not be called at all, the
	96	* failing .get_formats() must then clean up internally.
	97	*/
	98	int (get_formats)(struct soc_camera_device , unsigned int,
	99	struct soc_camera_format_xlate *);
	100	void (put_formats)(struct soc_camera_device );
	101	int (get_selection)(struct soc_camera_device , struct v4l2_selection *);
	102	int (set_selection)(struct soc_camera_device , struct v4l2_selection *);
	103	/*
	104	* The difference to .set_selection() is, that .set_liveselection is not allowed
	105	* to change the output sizes
	106	*/
	107	int (set_liveselection)(struct soc_camera_device , struct v4l2_selection *);
	108	int (set_fmt)(struct soc_camera_device , struct v4l2_format *);
	109	int (try_fmt)(struct soc_camera_device , struct v4l2_format *);
	110	int (init_videobuf2)(struct vb2_queue ,
	111	struct soc_camera_device *);
	112	int (querycap)(struct soc_camera_host , struct v4l2_capability *);
	113	int (set_bus_param)(struct soc_camera_device );
	114	int (get_parm)(struct soc_camera_device , struct v4l2_streamparm *);
	115	int (set_parm)(struct soc_camera_device , struct v4l2_streamparm *);
	116	int (enum_framesizes)(struct soc_camera_device , struct v4l2_frmsizeenum *);
	117	__poll_t (poll)(struct file , poll_table *);
	118	};
	119
	120	#define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
	121	#define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
	122	#define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
	123	#define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
	124	#define SOCAM_SENSOR_INVERT_DATA (1 << 4)
	125
	126	struct i2c_board_info;
	127	struct regulator_bulk_data;
	128
	129	struct soc_camera_subdev_desc {
	130	/* Per camera SOCAM_SENSOR_* bus flags */
	131	unsigned long flags;
	132
	133	/* sensor driver private platform data */
	134	void *drv_priv;
	135
	136	/*
	137	* Set unbalanced_power to true to deal with legacy drivers, failing to
	138	* balance their calls to subdevice's .s_power() method. clock_state is
	139	* then used internally by helper functions, it shouldn't be touched by
	140	* drivers or the platform code.
	141	*/
	142	bool unbalanced_power;
	143	unsigned long clock_state;
	144
	145	/* Optional callbacks to power on or off and reset the sensor */
	146	int (power)(struct device , int);
	147	int (reset)(struct device );
	148
	149	/*
	150	* some platforms may support different data widths than the sensors
	151	* native ones due to different data line routing. Let the board code
	152	* overwrite the width flags.
	153	*/
	154	int (set_bus_param)(struct soc_camera_subdev_desc , unsigned long flags);
	155	unsigned long (query_bus_param)(struct soc_camera_subdev_desc );
	156	void (free_bus)(struct soc_camera_subdev_desc );
	157
	158	/* Optional regulators that have to be managed on power on/off events */
	159	struct v4l2_subdev_platform_data sd_pdata;
	160	};
	161
	162	struct soc_camera_host_desc {
	163	/* Camera bus id, used to match a camera and a bus */
	164	int bus_id;
	165	int i2c_adapter_id;
	166	struct i2c_board_info *board_info;
	167	const char *module_name;
	168
	169	/*
	170	* For non-I2C devices platform has to provide methods to add a device
	171	* to the system and to remove it
	172	*/
	173	int (add_device)(struct soc_camera_device );
	174	void (del_device)(struct soc_camera_device );
	175	};
	176
	177	/*
	178	* Platform data for "soc-camera-pdrv"
	179	* This MUST be kept binary-identical to struct soc_camera_link below, until
	180	* it is completely replaced by this one, after which we can split it into its
	181	* two components.
	182	*/
	183	struct soc_camera_desc {
	184	struct soc_camera_subdev_desc subdev_desc;
	185	struct soc_camera_host_desc host_desc;
	186	};
	187
	188	/* Prepare to replace this struct: don't change its layout any more! */
	189	struct soc_camera_link {
	190	/*
	191	* Subdevice part - keep at top and compatible to
	192	* struct soc_camera_subdev_desc
	193	*/
	194
	195	/* Per camera SOCAM_SENSOR_* bus flags */
	196	unsigned long flags;
	197
	198	void *priv;
	199
	200	/* Set by platforms to handle misbehaving drivers */
	201	bool unbalanced_power;
	202	/* Used by soc-camera helper functions */
	203	unsigned long clock_state;
	204
	205	/* Optional callbacks to power on or off and reset the sensor */
	206	int (power)(struct device , int);
	207	int (reset)(struct device );
	208	/*
	209	* some platforms may support different data widths than the sensors
	210	* native ones due to different data line routing. Let the board code
	211	* overwrite the width flags.
	212	*/
	213	int (set_bus_param)(struct soc_camera_link , unsigned long flags);
	214	unsigned long (query_bus_param)(struct soc_camera_link );
	215	void (free_bus)(struct soc_camera_link );
	216
	217	/* Optional regulators that have to be managed on power on/off events */
	218	struct regulator_bulk_data *regulators;
	219	int num_regulators;
	220
	221	void *host_priv;
	222
	223	/*
	224	* Host part - keep at bottom and compatible to
	225	* struct soc_camera_host_desc
	226	*/
	227
	228	/* Camera bus id, used to match a camera and a bus */
	229	int bus_id;
	230	int i2c_adapter_id;
	231	struct i2c_board_info *board_info;
	232	const char *module_name;
	233
	234	/*
	235	* For non-I2C devices platform has to provide methods to add a device
	236	* to the system and to remove it
	237	*/
	238	int (add_device)(struct soc_camera_device );
	239	void (del_device)(struct soc_camera_device );
	240	};
	241
	242	static inline struct soc_camera_host *to_soc_camera_host(
	243	const struct device *dev)
	244	{
	245	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
	246
	247	return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
	248	}
	249
	250	static inline struct soc_camera_desc *to_soc_camera_desc(
	251	const struct soc_camera_device *icd)
	252	{
	253	return icd->sdesc;
	254	}
	255
	256	static inline struct device *to_soc_camera_control(
	257	const struct soc_camera_device *icd)
	258	{
	259	return icd->control;
	260	}
	261
	262	static inline struct v4l2_subdev *soc_camera_to_subdev(
	263	const struct soc_camera_device *icd)
	264	{
	265	struct device *control = to_soc_camera_control(icd);
	266	return dev_get_drvdata(control);
	267	}
	268
	269	int soc_camera_host_register(struct soc_camera_host *ici);
	270	void soc_camera_host_unregister(struct soc_camera_host *ici);
	271
	272	const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
	273	struct soc_camera_device *icd, unsigned int fourcc);
	274
	275	/**
	276	* struct soc_camera_format_xlate - match between host and sensor formats
	277	* @code: code of a sensor provided format
	278	* @host_fmt: host format after host translation from code
	279	*
	280	* Host and sensor translation structure. Used in table of host and sensor
	281	* formats matchings in soc_camera_device. A host can override the generic list
	282	* generation by implementing get_formats(), and use it for format checks and
	283	* format setup.
	284	*/
	285	struct soc_camera_format_xlate {
	286	u32 code;
	287	const struct soc_mbus_pixelfmt *host_fmt;
	288	};
	289
	290	#define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
	291
	292	/**
	293	* This struct can be attached to struct soc_camera_device by the host driver
	294	* to request sense from the camera, for example, when calling .set_fmt(). The
	295	* host then can check which flags are set and verify respective values if any.
	296	* For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
	297	* changed during this operation. After completion the host should detach sense.
	298	*
	299	* @flags ored SOCAM_SENSE_* flags
	300	* @master_clock if the host wants to be informed about pixel-clock
	301	* change, it better set master_clock.
	302	* @pixel_clock_max maximum pixel clock frequency supported by the host,
	303	* camera is not allowed to exceed this.
	304	* @pixel_clock if the camera driver changed pixel clock during this
	305	* operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
	306	* master_clock to calculate the new pixel-clock and
	307	* sets this field.
	308	*/
	309	struct soc_camera_sense {
	310	unsigned long flags;
	311	unsigned long master_clock;
	312	unsigned long pixel_clock_max;
	313	unsigned long pixel_clock;
	314	};
	315
	316	#define SOCAM_DATAWIDTH(x) BIT((x) - 1)
	317	#define SOCAM_DATAWIDTH_4 SOCAM_DATAWIDTH(4)
	318	#define SOCAM_DATAWIDTH_8 SOCAM_DATAWIDTH(8)
	319	#define SOCAM_DATAWIDTH_9 SOCAM_DATAWIDTH(9)
	320	#define SOCAM_DATAWIDTH_10 SOCAM_DATAWIDTH(10)
	321	#define SOCAM_DATAWIDTH_12 SOCAM_DATAWIDTH(12)
	322	#define SOCAM_DATAWIDTH_15 SOCAM_DATAWIDTH(15)
	323	#define SOCAM_DATAWIDTH_16 SOCAM_DATAWIDTH(16)
	324	#define SOCAM_DATAWIDTH_18 SOCAM_DATAWIDTH(18)
	325	#define SOCAM_DATAWIDTH_24 SOCAM_DATAWIDTH(24)
	326
	327	#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 \| SOCAM_DATAWIDTH_8 \| \
	328	SOCAM_DATAWIDTH_9 \| SOCAM_DATAWIDTH_10 \| \
	329	SOCAM_DATAWIDTH_12 \| SOCAM_DATAWIDTH_15 \| \
	330	SOCAM_DATAWIDTH_16 \| SOCAM_DATAWIDTH_18 \| \
	331	SOCAM_DATAWIDTH_24)
	332
	333	static inline void soc_camera_limit_side(int start, int length,
	334	unsigned int start_min,
	335	unsigned int length_min, unsigned int length_max)
	336	{
	337	if (*length < length_min)
	338	*length = length_min;
	339	else if (*length > length_max)
	340	*length = length_max;
	341
	342	if (*start < start_min)
	343	*start = start_min;
	344	else if (start > start_min + length_max - length)
	345	start = start_min + length_max - length;
	346	}
	347
	348	unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
	349	const struct v4l2_mbus_config *cfg);
	350
	351	int soc_camera_power_init(struct device dev, struct soc_camera_subdev_desc ssdd);
	352	int soc_camera_power_on(struct device dev, struct soc_camera_subdev_desc ssdd,
	353	struct v4l2_clk *clk);
	354	int soc_camera_power_off(struct device dev, struct soc_camera_subdev_desc ssdd,
	355	struct v4l2_clk *clk);
	356
	357	static inline int soc_camera_set_power(struct device *dev,
	358	struct soc_camera_subdev_desc ssdd, struct v4l2_clk clk, bool on)
	359	{
	360	return on ? soc_camera_power_on(dev, ssdd, clk)
	361	: soc_camera_power_off(dev, ssdd, clk);
	362	}
	363
	364	/* This is only temporary here - until v4l2-subdev begins to link to video_device */
	365	#include <linux/i2c.h>
	366	static inline struct video_device soc_camera_i2c_to_vdev(const struct i2c_client client)
	367	{
	368	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	369	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
	370	return icd ? icd->vdev : NULL;
	371	}
	372
	373	static inline struct soc_camera_subdev_desc soc_camera_i2c_to_desc(const struct i2c_client client)
	374	{
	375	return client->dev.platform_data;
	376	}
	377
	378	static inline struct v4l2_subdev soc_camera_vdev_to_subdev(struct video_device vdev)
	379	{
	380	struct soc_camera_device *icd = video_get_drvdata(vdev);
	381	return soc_camera_to_subdev(icd);
	382	}
	383
	384	static inline struct soc_camera_device soc_camera_from_vb2q(const struct vb2_queue vq)
	385	{
	386	return container_of(vq, struct soc_camera_device, vb2_vidq);
	387	}
	388
	389	static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
	390	{
	391	return (icd->iface << 8) \| (icd->devnum + 1);
	392	}
	393
	394	void soc_camera_lock(struct vb2_queue *vq);
	395	void soc_camera_unlock(struct vb2_queue *vq);
	396
	397	#endif