V4L/DVB (13618): v4l2: Adding helper function to get dv preset description

This patch adds a helper function to get description of a digital
video preset added by the video timing API. This will be useful for drivers
implementing the above API.
Signed-off-by: Muralidharan Karicheri <m-karicheri2@ti.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/v4l2-common.c

@@ -1024,3 +1024,50 @@ void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
 	}
 }
 EXPORT_SYMBOL_GPL(v4l_bound_align_image);
+
+/**
+ * v4l_fill_dv_preset_info - fill description of a digital video preset
+ * @preset - preset value
+ * @info - pointer to struct v4l2_dv_enum_preset
+ *
+ * drivers can use this helper function to fill description of dv preset
+ * in info.
+ */
+int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info)
+{
+	static const struct v4l2_dv_preset_info {
+		u16 width;
+		u16 height;
+		const char *name;
+	} dv_presets[] = {
+		{ 0, 0, "Invalid" },		/* V4L2_DV_INVALID */
+		{ 720,  480, "480p@59.94" },	/* V4L2_DV_480P59_94 */
+		{ 720,  576, "576p@50" },	/* V4L2_DV_576P50 */
+		{ 1280, 720, "720p@24" },	/* V4L2_DV_720P24 */
+		{ 1280, 720, "720p@25" },	/* V4L2_DV_720P25 */
+		{ 1280, 720, "720p@30" },	/* V4L2_DV_720P30 */
+		{ 1280, 720, "720p@50" },	/* V4L2_DV_720P50 */
+		{ 1280, 720, "720p@59.94" },	/* V4L2_DV_720P59_94 */
+		{ 1280, 720, "720p@60" },	/* V4L2_DV_720P60 */
+		{ 1920, 1080, "1080i@29.97" },	/* V4L2_DV_1080I29_97 */
+		{ 1920, 1080, "1080i@30" },	/* V4L2_DV_1080I30 */
+		{ 1920, 1080, "1080i@25" },	/* V4L2_DV_1080I25 */
+		{ 1920, 1080, "1080i@50" },	/* V4L2_DV_1080I50 */
+		{ 1920, 1080, "1080i@60" },	/* V4L2_DV_1080I60 */
+		{ 1920, 1080, "1080p@24" },	/* V4L2_DV_1080P24 */
+		{ 1920, 1080, "1080p@25" },	/* V4L2_DV_1080P25 */
+		{ 1920, 1080, "1080p@30" },	/* V4L2_DV_1080P30 */
+		{ 1920, 1080, "1080p@50" },	/* V4L2_DV_1080P50 */
+		{ 1920, 1080, "1080p@60" },	/* V4L2_DV_1080P60 */
+	};
+
+	if (info == NULL || preset >= ARRAY_SIZE(dv_presets))
+		return -EINVAL;
+
+	info->preset = preset;
+	info->width = dv_presets[preset].width;
+	info->height = dv_presets[preset].height;
+	strlcpy(info->name, dv_presets[preset].name, sizeof(info->name));
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l_fill_dv_preset_info);

include/media/v4l2-common.h

@@ -212,5 +212,5 @@ void v4l_bound_align_image(unsigned int *w, unsigned int wmin,
 			   unsigned int *h, unsigned int hmin,
 			   unsigned int hmax, unsigned int halign,
 			   unsigned int salign);
-
+int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info);
 #endif /* V4L2_COMMON_H_ */