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[media] media: Determine early whether an IOCTL is supported 

Preparation for refactoring media IOCTL handling to unify common parts.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sakari Ailus 2016-04-27 09:39:17 -03:00 committed by Mauro Carvalho Chehab
parent 2950da4895
commit cf439d5f4d
1 changed files with 20 additions and 0 deletions
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20
drivers/media/media-device.c
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@ -419,6 +419,22 @@ static long media_device_get_topology(struct media_device *mdev,
return 0;
}
#define MEDIA_IOC(__cmd) \
[_IOC_NR(MEDIA_IOC_##__cmd)] = { .cmd = MEDIA_IOC_##__cmd }
/* the table is indexed by _IOC_NR(cmd) */
struct media_ioctl_info {
unsigned int cmd;
};
static const struct media_ioctl_info ioctl_info[] = {
MEDIA_IOC(DEVICE_INFO),
MEDIA_IOC(ENUM_ENTITIES),
MEDIA_IOC(ENUM_LINKS),
MEDIA_IOC(SETUP_LINK),
MEDIA_IOC(G_TOPOLOGY),
};
static long media_device_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
@ -426,6 +442,10 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd,
struct media_device *dev = devnode->media_dev;
long ret;
if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
|| ioctl_info[_IOC_NR(cmd)].cmd != cmd)
return -ENOIOCTLCMD;
mutex_lock(&dev->graph_mutex);
switch (cmd) {
case MEDIA_IOC_DEVICE_INFO: