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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2010-08-18 11:41:22 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-03-22 04:53:13 -0300
commit140d88165c25137e871f9559e67986ed89251105 (patch)
treec02891d72b0b85c03d4f493da4c5f37923c836c6 /drivers/media/media-device.c
parent503c3d829eaf48837dd5bff5d97ad66369bb955a (diff)
downloadlinux-140d88165c25137e871f9559e67986ed89251105.tar.bz2
[media] media: Media device information query
Create the following ioctl and implement it at the media device level to query device information. - MEDIA_IOC_DEVICE_INFO: Query media device information The ioctl and its data structure are defined in the new kernel header linux/media.h available to userspace applications. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/media-device.c')
-rw-r--r--drivers/media/media-device.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index d2bc809d7a2a..92e0d4eb84b8 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -22,13 +22,70 @@
#include <linux/types.h>
#include <linux/ioctl.h>
+#include <linux/media.h>
#include <media/media-device.h>
#include <media/media-devnode.h>
#include <media/media-entity.h>
+/* -----------------------------------------------------------------------------
+ * Userspace API
+ */
+
+static int media_device_open(struct file *filp)
+{
+ return 0;
+}
+
+static int media_device_close(struct file *filp)
+{
+ return 0;
+}
+
+static int media_device_get_info(struct media_device *dev,
+ struct media_device_info __user *__info)
+{
+ struct media_device_info info;
+
+ memset(&info, 0, sizeof(info));
+
+ strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
+ strlcpy(info.model, dev->model, sizeof(info.model));
+ strlcpy(info.serial, dev->serial, sizeof(info.serial));
+ strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
+
+ info.media_version = MEDIA_API_VERSION;
+ info.hw_revision = dev->hw_revision;
+ info.driver_version = dev->driver_version;
+
+ return copy_to_user(__info, &info, sizeof(*__info));
+}
+
+static long media_device_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct media_devnode *devnode = media_devnode_data(filp);
+ struct media_device *dev = to_media_device(devnode);
+ long ret;
+
+ switch (cmd) {
+ case MEDIA_IOC_DEVICE_INFO:
+ ret = media_device_get_info(dev,
+ (struct media_device_info __user *)arg);
+ break;
+
+ default:
+ ret = -ENOIOCTLCMD;
+ }
+
+ return ret;
+}
+
static const struct media_file_operations media_device_fops = {
.owner = THIS_MODULE,
+ .open = media_device_open,
+ .ioctl = media_device_ioctl,
+ .release = media_device_close,
};
/* -----------------------------------------------------------------------------