drivers/gpu/drm/clients/drm_fbdev_client.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/clients/drm_fbdev_client.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/clients/drm_fbdev_client.c
Extension
.c
Size
4413 bytes
Lines
177
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source 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 (bpp) {
		case 16:
			color_mode = format->depth; // could also be 15
			break;
		default:
			color_mode = bpp;
		}
	} else {
		switch (dev->mode_config.preferred_depth) {
		case 0:
		case 24:
			color_mode = 32;
			break;
		default:
			color_mode = dev->mode_config.preferred_depth;
		}
	}

	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
	drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");

	fb_helper = kzalloc_obj(*fb_helper);
	if (!fb_helper)
		return -ENOMEM;
	drm_fb_helper_prepare(dev, fb_helper, color_mode, NULL);

	ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
	if (ret) {
		drm_err(dev, "Failed to register client: %d\n", ret);
		goto err_drm_client_init;
	}

	drm_client_register(&fb_helper->client);

	return 0;

err_drm_client_init:
	drm_fb_helper_unprepare(fb_helper);
	kfree(fb_helper);
	return ret;
}

Annotation

Implementation Notes