linux-imx

/*

 * Driver for the VIA Chrome integrated camera controller.

 *

 * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net>

 * Distributable under the terms of the GNU General Public License, version 2

 *

 * This work was supported by the One Laptop Per Child project

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/device.h>

#include <linux/list.h>

#include <linux/pci.h>

#include <linux/gpio.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/videodev2.h>

#include <media/v4l2-device.h>

#include <media/v4l2-ioctl.h>

#include <media/v4l2-ctrls.h>

#include <media/v4l2-image-sizes.h>

#include <media/i2c/ov7670.h>

#include <media/videobuf-dma-sg.h>

#include <linux/delay.h>

#include <linux/dma-mapping.h>

#include <linux/pm_qos.h>

#include <linux/via-core.h>

#include <linux/via-gpio.h>

#include <linux/via_i2c.h>

​

#ifdef CONFIG_X86

#include <asm/olpc.h>

#else

#define machine_is_olpc(x) 0

#endif

​

#include "via-camera.h"

​

MODULE_ALIAS("platform:viafb-camera");

MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");

MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");

MODULE_LICENSE("GPL");

​

static bool flip_image;

module_param(flip_image, bool, 0444);

MODULE_PARM_DESC(flip_image,

        "If set, the sensor will be instructed to flip the image vertically.");

​

static bool override_serial;

module_param(override_serial, bool, 0444);

MODULE_PARM_DESC(override_serial,

        "The camera driver will normally refuse to load if the XO 1.5 serial port is enabled.  Set this option to force-enable the camera.");

​

/*

 * The structure describing our camera.

 */

enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };

​

struct via_camera {

    struct v4l2_device v4l2_dev;

    struct v4l2_ctrl_handler ctrl_handler;

    struct video_device vdev;

    struct v4l2_subdev *sensor;

    struct platform_device *platdev;

    struct viafb_dev *viadev;

    struct mutex lock;

    enum viacam_opstate opstate;

    unsigned long flags;

    struct pm_qos_request qos_request;

    /*

     * GPIO info for power/reset management

     */

    int power_gpio;

    int reset_gpio;

    /*

     * I/O memory stuff.

     */

    void __iomem *mmio; /* Where the registers live */

    void __iomem *fbmem;    /* Frame buffer memory */

    u32 fb_offset;      /* Reserved memory offset (FB) */

    /*

     * Capture buffers and related.  The controller supports

     * up to three, so that's what we have here.  These buffers

     * live in frame buffer memory, so we don't call them "DMA".

     */

    unsigned int cb_offsets[3]; /* offsets into fb mem */

    u8 __iomem *cb_addrs[3];        /* Kernel-space addresses */

    int n_cap_bufs;         /* How many are we using? */

    int next_buf;

    struct videobuf_queue vb_queue;

    struct list_head buffer_queue;  /* prot. by reg_lock */

    /*