uvc_compat.h

Go to the documentation of this file.

#ifndef _UVC_COMPAT_H
#define _UVC_COMPAT_H

#include <linux/version.h>

#ifndef __KERNEL__
#ifndef __user
#define __user
#endif
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
/*
 * Extended control API
 */
struct v4l2_ext_control {
        __u32 id;
        __u32 reserved2[2];
        union {
                __s32 value;
                __s64 value64;
                void *reserved;
        };
} __attribute__ ((packed));

struct v4l2_ext_controls {
        __u32 ctrl_class;
        __u32 count;
        __u32 error_idx;
        __u32 reserved[2];
        struct v4l2_ext_control *controls;
};

/* Values for ctrl_class field */
#define V4L2_CTRL_CLASS_USER            0x00980000      /* Old-style 'user' controls */
#define V4L2_CTRL_CLASS_MPEG            0x00990000      /* MPEG-compression controls */

#define V4L2_CTRL_ID_MASK               (0x0fffffff)
#define V4L2_CTRL_ID2CLASS(id)          ((id) & 0x0fff0000UL)
#define V4L2_CTRL_DRIVER_PRIV(id)       (((id) & 0xffff) >= 0x1000)

/* Control flags */
#define V4L2_CTRL_FLAG_READ_ONLY        0x0004
#define V4L2_CTRL_FLAG_UPDATE           0x0008
#define V4L2_CTRL_FLAG_INACTIVE         0x0010
#define V4L2_CTRL_FLAG_SLIDER           0x0020

/* Query flags, to be ORed with the control ID */
#define V4L2_CTRL_FLAG_NEXT_CTRL        0x80000000

/* User-class control IDs defined by V4L2 */
#undef  V4L2_CID_BASE
#define V4L2_CID_BASE                   (V4L2_CTRL_CLASS_USER | 0x900)
#define V4L2_CID_USER_BASE              V4L2_CID_BASE
#define V4L2_CID_USER_CLASS             (V4L2_CTRL_CLASS_USER | 1)

#define VIDIOC_G_EXT_CTRLS              _IOWR('V', 71, struct v4l2_ext_controls)
#define VIDIOC_S_EXT_CTRLS              _IOWR('V', 72, struct v4l2_ext_controls)
#define VIDIOC_TRY_EXT_CTRLS            _IOWR('V', 73, struct v4l2_ext_controls)

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
/*
 * Frame size and frame rate enumeration
 *
 * Included in Linux 2.6.19
 */
enum v4l2_frmsizetypes {
        V4L2_FRMSIZE_TYPE_DISCRETE      = 1,
        V4L2_FRMSIZE_TYPE_CONTINUOUS    = 2,
        V4L2_FRMSIZE_TYPE_STEPWISE      = 3,
};

struct v4l2_frmsize_discrete {
        __u32                   width;          /* Frame width [pixel] */
        __u32                   height;         /* Frame height [pixel] */
};

struct v4l2_frmsize_stepwise {
        __u32                   min_width;      /* Minimum frame width [pixel] */
        __u32                   max_width;      /* Maximum frame width [pixel] */
        __u32                   step_width;     /* Frame width step size [pixel] */
        __u32                   min_height;     /* Minimum frame height [pixel] */
        __u32                   max_height;     /* Maximum frame height [pixel] */
        __u32                   step_height;    /* Frame height step size [pixel] */
};

struct v4l2_frmsizeenum {
        __u32                   index;          /* Frame size number */
        __u32                   pixel_format;   /* Pixel format */
        __u32                   type;           /* Frame size type the device supports. */

        union {                                 /* Frame size */
                struct v4l2_frmsize_discrete    discrete;
                struct v4l2_frmsize_stepwise    stepwise;
        };

        __u32   reserved[2];                    /* Reserved space for future use */
};

enum v4l2_frmivaltypes {
        V4L2_FRMIVAL_TYPE_DISCRETE      = 1,
        V4L2_FRMIVAL_TYPE_CONTINUOUS    = 2,
        V4L2_FRMIVAL_TYPE_STEPWISE      = 3,
};

struct v4l2_frmival_stepwise {
        struct v4l2_fract       min;            /* Minimum frame interval [s] */
        struct v4l2_fract       max;            /* Maximum frame interval [s] */
        struct v4l2_fract       step;           /* Frame interval step size [s] */
};

struct v4l2_frmivalenum {
        __u32                   index;          /* Frame format index */
        __u32                   pixel_format;   /* Pixel format */
        __u32                   width;          /* Frame width */
        __u32                   height;         /* Frame height */
        __u32                   type;           /* Frame interval type the device supports. */

        union {                                 /* Frame interval */
                struct v4l2_fract               discrete;
                struct v4l2_frmival_stepwise    stepwise;
        };

        __u32   reserved[2];                    /* Reserved space for future use */
};

#define VIDIOC_ENUM_FRAMESIZES          _IOWR('V', 74, struct v4l2_frmsizeenum)
#define VIDIOC_ENUM_FRAMEINTERVALS      _IOWR('V', 75, struct v4l2_frmivalenum)
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26)
/*
 * V4L2 Control identifiers.
 */
#define V4L2_CTRL_CLASS_CAMERA 0x009A0000       /* Camera class controls */

#define V4L2_CID_POWER_LINE_FREQUENCY           (V4L2_CID_BASE+24)
enum v4l2_power_line_frequency {
        V4L2_CID_POWER_LINE_FREQUENCY_DISABLED  = 0,
        V4L2_CID_POWER_LINE_FREQUENCY_50HZ      = 1,
        V4L2_CID_POWER_LINE_FREQUENCY_60HZ      = 2,
};

#define V4L2_CID_HUE_AUTO                       (V4L2_CID_BASE+25)
#define V4L2_CID_WHITE_BALANCE_TEMPERATURE      (V4L2_CID_BASE+26)
#define V4L2_CID_SHARPNESS                      (V4L2_CID_BASE+27)
#define V4L2_CID_BACKLIGHT_COMPENSATION         (V4L2_CID_BASE+28)

#define V4L2_CID_CAMERA_CLASS_BASE              (V4L2_CTRL_CLASS_CAMERA | 0x900)
#define V4L2_CID_CAMERA_CLASS                   (V4L2_CTRL_CLASS_CAMERA | 1)

#define V4L2_CID_EXPOSURE_AUTO                  (V4L2_CID_CAMERA_CLASS_BASE+1)
enum  v4l2_exposure_auto_type {
        V4L2_EXPOSURE_MANUAL = 0,
        V4L2_EXPOSURE_AUTO = 1,
        V4L2_EXPOSURE_SHUTTER_PRIORITY = 2,
        V4L2_EXPOSURE_APERTURE_PRIORITY = 3
};
#define V4L2_CID_EXPOSURE_ABSOLUTE              (V4L2_CID_CAMERA_CLASS_BASE+2)
#define V4L2_CID_EXPOSURE_AUTO_PRIORITY         (V4L2_CID_CAMERA_CLASS_BASE+3)

#define V4L2_CID_PAN_RELATIVE                   (V4L2_CID_CAMERA_CLASS_BASE+4)
#define V4L2_CID_TILT_RELATIVE                  (V4L2_CID_CAMERA_CLASS_BASE+5)
#define V4L2_CID_PAN_RESET                      (V4L2_CID_CAMERA_CLASS_BASE+6)
#define V4L2_CID_TILT_RESET                     (V4L2_CID_CAMERA_CLASS_BASE+7)

#define V4L2_CID_PAN_ABSOLUTE                   (V4L2_CID_CAMERA_CLASS_BASE+8)
#define V4L2_CID_TILT_ABSOLUTE                  (V4L2_CID_CAMERA_CLASS_BASE+9)

#define V4L2_CID_FOCUS_ABSOLUTE                 (V4L2_CID_CAMERA_CLASS_BASE+10)
#define V4L2_CID_FOCUS_RELATIVE                 (V4L2_CID_CAMERA_CLASS_BASE+11)
#define V4L2_CID_FOCUS_AUTO                     (V4L2_CID_CAMERA_CLASS_BASE+12)

#endif

#ifdef __KERNEL__

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
/*
 * kzalloc()
 */
static inline void *
kzalloc(size_t size, unsigned int __nocast gfp_flags)
{
        void *mem = kmalloc(size, gfp_flags);
        if (mem)
                memset(mem, 0, size);
        return mem;
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
/*
 * vm_insert_page()
 */
static inline int
vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
                struct page *page)
{
        /* Not sure if this is needed. remap_pfn_range() sets VM_RESERVED
         * in 2.6.14.
         */
        vma->vm_flags |= VM_RESERVED;

        SetPageReserved(page);
        return remap_pfn_range(vma, addr, page_to_pfn(page), PAGE_SIZE,
                                vma->vm_page_prot);
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
/*
 * v4l_printk_ioctl()
 */
static inline void
v4l_printk_ioctl(unsigned int cmd)
{
        switch (_IOC_TYPE(cmd)) {
        case 'v':
                printk(KERN_DEBUG "ioctl 0x%x (V4L1)\n", cmd);
                break;
        case 'V':
                printk(KERN_DEBUG "ioctl 0x%x (%s)\n",
                        cmd, v4l2_ioctl_names[_IOC_NR(cmd)]);
                break;
        default:
                printk(KERN_DEBUG "ioctl 0x%x (?)\n", cmd);
                break;
        }
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16)
/*
 * Mutex API
 */
#include <asm/semaphore.h>
#define mutex_lock(mutex) down(mutex)
#define mutex_lock_interruptible(mutex) down_interruptible(mutex)
#define mutex_unlock(mutex) up(mutex)
#define mutex_init(mutex) init_MUTEX(mutex)
#define mutex semaphore
#else
#include <asm/mutex.h>
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
/*
 * usb_endpoint_* functions
 *
 * Included in Linux 2.6.19
 */
static inline int usb_endpoint_dir_in(const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN);
}

static inline int usb_endpoint_xfer_int(const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_INT);
}

static inline int usb_endpoint_xfer_isoc(const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_ISOC);
}

static inline int usb_endpoint_xfer_bulk(const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_BULK);
}

static inline int usb_endpoint_is_int_in(const struct usb_endpoint_descriptor *epd)
{
        return (usb_endpoint_xfer_int(epd) && usb_endpoint_dir_in(epd));
}

/*
 * USB auto suspend
 *
 * Included in Linux 2.6.19
 */
static inline int usb_autopm_get_interface(struct usb_interface *intf)
{ return 0; }

static inline void usb_autopm_put_interface(struct usb_interface *intf)
{ }

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
/*
 * Linked list API
 */
#define list_first_entry(ptr, type, member) \
        list_entry((ptr)->next, type, member)
#endif

#endif /* __KERNEL__ */

#endif /* _UVC_COMPAT_H */