413 lines
13 KiB
C
413 lines
13 KiB
C
/*
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* camera image capture (abstract) bus driver header
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*
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* Copyright (C) 2006, Sascha Hauer, Pengutronix
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* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef SOC_CAMERA_H
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#define SOC_CAMERA_H
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/videodev2.h>
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#include <media/videobuf-core.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/v4l2-async.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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struct file;
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struct soc_camera_desc;
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struct soc_camera_async_client;
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struct soc_camera_device {
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struct list_head list; /* list of all registered devices */
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struct soc_camera_desc *sdesc;
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struct device *pdev; /* Platform device */
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struct device *parent; /* Camera host device */
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struct device *control; /* E.g., the i2c client */
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s32 user_width;
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s32 user_height;
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u32 bytesperline; /* for padding, zero if unused */
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u32 sizeimage;
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enum v4l2_colorspace colorspace;
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unsigned char iface; /* Host number */
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unsigned char devnum; /* Device number per host */
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struct soc_camera_sense *sense; /* See comment in struct definition */
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struct video_device *vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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const struct soc_camera_format_xlate *current_fmt;
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struct soc_camera_format_xlate *user_formats;
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int num_user_formats;
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enum v4l2_field field; /* Preserve field over close() */
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void *host_priv; /* Per-device host private data */
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/* soc_camera.c private count. Only accessed with .host_lock held */
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int use_count;
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struct file *streamer; /* stream owner */
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struct v4l2_clk *clk;
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/* Asynchronous subdevice management */
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struct soc_camera_async_client *sasc;
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/* video buffer queue */
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union {
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struct videobuf_queue vb_vidq;
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struct vb2_queue vb2_vidq;
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};
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};
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/* Host supports programmable stride */
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#define SOCAM_HOST_CAP_STRIDE (1 << 0)
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enum soc_camera_subdev_role {
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SOCAM_SUBDEV_DATA_SOURCE = 1,
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SOCAM_SUBDEV_DATA_SINK,
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SOCAM_SUBDEV_DATA_PROCESSOR,
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};
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struct soc_camera_async_subdev {
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struct v4l2_async_subdev asd;
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enum soc_camera_subdev_role role;
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};
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struct soc_camera_host {
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struct v4l2_device v4l2_dev;
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struct list_head list;
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struct mutex host_lock; /* Main synchronisation lock */
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struct mutex clk_lock; /* Protect pipeline modifications */
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unsigned char nr; /* Host number */
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u32 capabilities;
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struct soc_camera_device *icd; /* Currently attached client */
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void *priv;
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const char *drv_name;
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struct soc_camera_host_ops *ops;
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struct v4l2_async_subdev **asd; /* Flat array, arranged in groups */
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unsigned int *asd_sizes; /* 0-terminated array of asd group sizes */
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};
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struct soc_camera_host_ops {
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struct module *owner;
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int (*add)(struct soc_camera_device *);
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void (*remove)(struct soc_camera_device *);
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int (*clock_start)(struct soc_camera_host *);
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void (*clock_stop)(struct soc_camera_host *);
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/*
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* .get_formats() is called for each client device format, but
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* .put_formats() is only called once. Further, if any of the calls to
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* .get_formats() fail, .put_formats() will not be called at all, the
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* failing .get_formats() must then clean up internally.
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*/
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int (*get_formats)(struct soc_camera_device *, unsigned int,
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struct soc_camera_format_xlate *);
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void (*put_formats)(struct soc_camera_device *);
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int (*get_selection)(struct soc_camera_device *, struct v4l2_selection *);
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int (*set_selection)(struct soc_camera_device *, struct v4l2_selection *);
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/*
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* The difference to .set_selection() is, that .set_liveselection is not allowed
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* to change the output sizes
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*/
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int (*set_liveselection)(struct soc_camera_device *, struct v4l2_selection *);
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int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
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int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
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void (*init_videobuf)(struct videobuf_queue *,
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struct soc_camera_device *);
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int (*init_videobuf2)(struct vb2_queue *,
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struct soc_camera_device *);
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int (*reqbufs)(struct soc_camera_device *, struct v4l2_requestbuffers *);
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int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
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int (*set_bus_param)(struct soc_camera_device *);
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int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
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int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
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int (*enum_framesizes)(struct soc_camera_device *, struct v4l2_frmsizeenum *);
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unsigned int (*poll)(struct file *, poll_table *);
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};
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#define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
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#define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
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#define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
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#define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
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#define SOCAM_SENSOR_INVERT_DATA (1 << 4)
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struct i2c_board_info;
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struct regulator_bulk_data;
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struct soc_camera_subdev_desc {
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/* Per camera SOCAM_SENSOR_* bus flags */
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unsigned long flags;
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/* sensor driver private platform data */
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void *drv_priv;
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/*
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* Set unbalanced_power to true to deal with legacy drivers, failing to
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* balance their calls to subdevice's .s_power() method. clock_state is
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* then used internally by helper functions, it shouldn't be touched by
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* drivers or the platform code.
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*/
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bool unbalanced_power;
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unsigned long clock_state;
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/* Optional callbacks to power on or off and reset the sensor */
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int (*power)(struct device *, int);
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int (*reset)(struct device *);
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/*
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* some platforms may support different data widths than the sensors
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* native ones due to different data line routing. Let the board code
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* overwrite the width flags.
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*/
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int (*set_bus_param)(struct soc_camera_subdev_desc *, unsigned long flags);
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unsigned long (*query_bus_param)(struct soc_camera_subdev_desc *);
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void (*free_bus)(struct soc_camera_subdev_desc *);
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/* Optional regulators that have to be managed on power on/off events */
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struct v4l2_subdev_platform_data sd_pdata;
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};
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struct soc_camera_host_desc {
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/* Camera bus id, used to match a camera and a bus */
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int bus_id;
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int i2c_adapter_id;
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struct i2c_board_info *board_info;
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const char *module_name;
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/*
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* For non-I2C devices platform has to provide methods to add a device
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* to the system and to remove it
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*/
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int (*add_device)(struct soc_camera_device *);
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void (*del_device)(struct soc_camera_device *);
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};
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/*
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* Platform data for "soc-camera-pdrv"
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* This MUST be kept binary-identical to struct soc_camera_link below, until
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* it is completely replaced by this one, after which we can split it into its
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* two components.
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*/
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struct soc_camera_desc {
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struct soc_camera_subdev_desc subdev_desc;
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struct soc_camera_host_desc host_desc;
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};
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/* Prepare to replace this struct: don't change its layout any more! */
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struct soc_camera_link {
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/*
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* Subdevice part - keep at top and compatible to
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* struct soc_camera_subdev_desc
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*/
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/* Per camera SOCAM_SENSOR_* bus flags */
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unsigned long flags;
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void *priv;
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/* Set by platforms to handle misbehaving drivers */
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bool unbalanced_power;
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/* Used by soc-camera helper functions */
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unsigned long clock_state;
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/* Optional callbacks to power on or off and reset the sensor */
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int (*power)(struct device *, int);
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int (*reset)(struct device *);
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/*
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* some platforms may support different data widths than the sensors
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* native ones due to different data line routing. Let the board code
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* overwrite the width flags.
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*/
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int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
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unsigned long (*query_bus_param)(struct soc_camera_link *);
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void (*free_bus)(struct soc_camera_link *);
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/* Optional regulators that have to be managed on power on/off events */
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struct regulator_bulk_data *regulators;
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int num_regulators;
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void *host_priv;
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/*
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* Host part - keep at bottom and compatible to
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* struct soc_camera_host_desc
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*/
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/* Camera bus id, used to match a camera and a bus */
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int bus_id;
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int i2c_adapter_id;
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struct i2c_board_info *board_info;
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const char *module_name;
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/*
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* For non-I2C devices platform has to provide methods to add a device
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* to the system and to remove it
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*/
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int (*add_device)(struct soc_camera_device *);
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void (*del_device)(struct soc_camera_device *);
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};
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static inline struct soc_camera_host *to_soc_camera_host(
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const struct device *dev)
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{
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struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
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return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
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}
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static inline struct soc_camera_desc *to_soc_camera_desc(
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const struct soc_camera_device *icd)
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{
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return icd->sdesc;
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}
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static inline struct device *to_soc_camera_control(
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const struct soc_camera_device *icd)
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{
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return icd->control;
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}
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static inline struct v4l2_subdev *soc_camera_to_subdev(
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const struct soc_camera_device *icd)
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{
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struct device *control = to_soc_camera_control(icd);
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return dev_get_drvdata(control);
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}
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int soc_camera_host_register(struct soc_camera_host *ici);
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void soc_camera_host_unregister(struct soc_camera_host *ici);
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const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
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struct soc_camera_device *icd, unsigned int fourcc);
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/**
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* struct soc_camera_format_xlate - match between host and sensor formats
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* @code: code of a sensor provided format
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* @host_fmt: host format after host translation from code
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*
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* Host and sensor translation structure. Used in table of host and sensor
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* formats matchings in soc_camera_device. A host can override the generic list
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* generation by implementing get_formats(), and use it for format checks and
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* format setup.
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*/
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struct soc_camera_format_xlate {
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u32 code;
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const struct soc_mbus_pixelfmt *host_fmt;
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};
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#define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
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/**
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* This struct can be attached to struct soc_camera_device by the host driver
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* to request sense from the camera, for example, when calling .set_fmt(). The
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* host then can check which flags are set and verify respective values if any.
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* For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
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* changed during this operation. After completion the host should detach sense.
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*
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* @flags ored SOCAM_SENSE_* flags
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* @master_clock if the host wants to be informed about pixel-clock
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* change, it better set master_clock.
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* @pixel_clock_max maximum pixel clock frequency supported by the host,
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* camera is not allowed to exceed this.
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* @pixel_clock if the camera driver changed pixel clock during this
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* operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
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* master_clock to calculate the new pixel-clock and
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* sets this field.
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*/
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struct soc_camera_sense {
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unsigned long flags;
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unsigned long master_clock;
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unsigned long pixel_clock_max;
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unsigned long pixel_clock;
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};
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#define SOCAM_DATAWIDTH(x) BIT((x) - 1)
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#define SOCAM_DATAWIDTH_4 SOCAM_DATAWIDTH(4)
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#define SOCAM_DATAWIDTH_8 SOCAM_DATAWIDTH(8)
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#define SOCAM_DATAWIDTH_9 SOCAM_DATAWIDTH(9)
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#define SOCAM_DATAWIDTH_10 SOCAM_DATAWIDTH(10)
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#define SOCAM_DATAWIDTH_12 SOCAM_DATAWIDTH(12)
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#define SOCAM_DATAWIDTH_15 SOCAM_DATAWIDTH(15)
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#define SOCAM_DATAWIDTH_16 SOCAM_DATAWIDTH(16)
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#define SOCAM_DATAWIDTH_18 SOCAM_DATAWIDTH(18)
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#define SOCAM_DATAWIDTH_24 SOCAM_DATAWIDTH(24)
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#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
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SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
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SOCAM_DATAWIDTH_12 | SOCAM_DATAWIDTH_15 | \
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SOCAM_DATAWIDTH_16 | SOCAM_DATAWIDTH_18 | \
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SOCAM_DATAWIDTH_24)
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static inline void soc_camera_limit_side(int *start, int *length,
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unsigned int start_min,
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unsigned int length_min, unsigned int length_max)
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{
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if (*length < length_min)
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*length = length_min;
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else if (*length > length_max)
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*length = length_max;
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if (*start < start_min)
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*start = start_min;
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else if (*start > start_min + length_max - *length)
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*start = start_min + length_max - *length;
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}
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unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
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const struct v4l2_mbus_config *cfg);
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int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd);
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int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
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struct v4l2_clk *clk);
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int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
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struct v4l2_clk *clk);
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static inline int soc_camera_set_power(struct device *dev,
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struct soc_camera_subdev_desc *ssdd, struct v4l2_clk *clk, bool on)
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{
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return on ? soc_camera_power_on(dev, ssdd, clk)
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: soc_camera_power_off(dev, ssdd, clk);
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}
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/* This is only temporary here - until v4l2-subdev begins to link to video_device */
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#include <linux/i2c.h>
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static inline struct video_device *soc_camera_i2c_to_vdev(const struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
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return icd ? icd->vdev : NULL;
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}
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static inline struct soc_camera_subdev_desc *soc_camera_i2c_to_desc(const struct i2c_client *client)
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{
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return client->dev.platform_data;
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}
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static inline struct v4l2_subdev *soc_camera_vdev_to_subdev(struct video_device *vdev)
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{
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struct soc_camera_device *icd = video_get_drvdata(vdev);
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return soc_camera_to_subdev(icd);
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}
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static inline struct soc_camera_device *soc_camera_from_vb2q(const struct vb2_queue *vq)
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{
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return container_of(vq, struct soc_camera_device, vb2_vidq);
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}
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static inline struct soc_camera_device *soc_camera_from_vbq(const struct videobuf_queue *vq)
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{
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return container_of(vq, struct soc_camera_device, vb_vidq);
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}
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static inline u32 soc_camera_grp_id(const struct soc_camera_device *icd)
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{
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return (icd->iface << 8) | (icd->devnum + 1);
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}
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void soc_camera_lock(struct vb2_queue *vq);
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void soc_camera_unlock(struct vb2_queue *vq);
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#endif
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