drivers/video/fbdev/omap2/omapfb/dss/overlay.c

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/omap2/omapfb/dss/overlay.c

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/omap2/omapfb/dss/overlay.c
Extension
.c
Size
4201 bytes
Lines
192
Domain
Driver Families
Bucket
drivers/video
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (i) {
		case 0:
			ovl->name = "gfx";
			ovl->id = OMAP_DSS_GFX;
			break;
		case 1:
			ovl->name = "vid1";
			ovl->id = OMAP_DSS_VIDEO1;
			break;
		case 2:
			ovl->name = "vid2";
			ovl->id = OMAP_DSS_VIDEO2;
			break;
		case 3:
			ovl->name = "vid3";
			ovl->id = OMAP_DSS_VIDEO3;
			break;
		}

		ovl->caps = dss_feat_get_overlay_caps(ovl->id);
		ovl->supported_modes =
			dss_feat_get_supported_color_modes(ovl->id);

		r = dss_overlay_kobj_init(ovl, pdev);
		if (r)
			DSSERR("failed to create sysfs file\n");
	}
}

void dss_uninit_overlays(struct platform_device *pdev)
{
	int i;

	for (i = 0; i < num_overlays; ++i) {
		struct omap_overlay *ovl = &overlays[i];
		dss_overlay_kobj_uninit(ovl);
	}

	kfree(overlays);
	overlays = NULL;
	num_overlays = 0;
}

int dss_ovl_simple_check(struct omap_overlay *ovl,
		const struct omap_overlay_info *info)
{
	if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
		if (info->out_width != 0 && info->width != info->out_width) {
			DSSERR("check_overlay: overlay %d doesn't support "
					"scaling\n", ovl->id);
			return -EINVAL;
		}

		if (info->out_height != 0 && info->height != info->out_height) {
			DSSERR("check_overlay: overlay %d doesn't support "
					"scaling\n", ovl->id);
			return -EINVAL;
		}
	}

	if ((ovl->supported_modes & info->color_mode) == 0) {
		DSSERR("check_overlay: overlay %d doesn't support mode %d\n",
				ovl->id, info->color_mode);
		return -EINVAL;
	}

	if (info->zorder >= omap_dss_get_num_overlays()) {
		DSSERR("check_overlay: zorder %d too high\n", info->zorder);
		return -EINVAL;
	}

	if (dss_feat_rotation_type_supported(info->rotation_type) == 0) {
		DSSERR("check_overlay: rotation type %d not supported\n",
				info->rotation_type);
		return -EINVAL;
	}

	return 0;
}

int dss_ovl_check(struct omap_overlay *ovl, struct omap_overlay_info *info,
		const struct omap_video_timings *mgr_timings)
{
	u16 outw, outh;
	u16 dw, dh;

	dw = mgr_timings->x_res;
	dh = mgr_timings->y_res;

	if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {

Annotation

Implementation Notes