root/include/media/soc_camera.h

INCLUDED FROM

DEFINITIONS

1. to_soc_camera_host
2. to_soc_camera_desc
3. to_soc_camera_control
4. soc_camera_to_subdev
5. soc_camera_limit_side
6. soc_camera_set_power
7. soc_camera_i2c_to_vdev
8. soc_camera_i2c_to_desc
9. soc_camera_vdev_to_subdev
10. soc_camera_from_vb2q
11. soc_camera_from_vbq
12. soc_camera_grp_id

/*
 * camera image capture (abstract) bus driver header
 *
 * Copyright (C) 2006, Sascha Hauer, Pengutronix
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 *
 * 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.
 */

#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/videobuf-core.h>
#include <media/videobuf2-core.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 */
        union {
                struct videobuf_queue vb_vidq;
                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 (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
        int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
        int (*set_crop)(struct soc_camera_device *, const struct v4l2_crop *);
        int (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
        int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
        /*
         * The difference to .set_crop() is, that .set_livecrop is not allowed
         * to change the output sizes
         */
        int (*set_livecrop)(struct soc_camera_device *, const struct v4l2_crop *);
        int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
        int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
        void (*init_videobuf)(struct videobuf_queue *,
                              struct soc_camera_device *);
        int (*init_videobuf2)(struct vb2_queue *,
                              struct soc_camera_device *);
        int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
        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 *);
        unsigned int (*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 {
        enum v4l2_mbus_pixelcode 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 struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq)
{
        return container_of(vq, struct soc_camera_device, vb_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