drivers/video/of_videomode.c

Source file repositories/reference/linux-study-clean/drivers/video/of_videomode.c

File Facts

System
Linux kernel
Corpus path
drivers/video/of_videomode.c
Extension
.c
Size
1406 bytes
Lines
52
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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * generic videomode helper
 *
 * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
 */
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/of.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>

/**
 * of_get_videomode - get the videomode #<index> from devicetree
 * @np: devicenode with the display_timings
 * @vm: set to return value
 * @index: index into list of display_timings
 *	    (Set this to OF_USE_NATIVE_MODE to use whatever mode is
 *	     specified as native mode in the DT.)
 *
 * DESCRIPTION:
 * Get a list of all display timings and put the one
 * specified by index into *vm. This function should only be used, if
 * only one videomode is to be retrieved. A driver that needs to work
 * with multiple/all videomodes should work with
 * of_get_display_timings instead.
 **/
int of_get_videomode(struct device_node *np, struct videomode *vm,
		     int index)
{
	struct display_timings *disp;
	int ret;

	disp = of_get_display_timings(np);
	if (!disp) {
		pr_err("%pOF: no timings specified\n", np);
		return -EINVAL;
	}

	if (index == OF_USE_NATIVE_MODE)
		index = disp->native_mode;

	ret = videomode_from_timings(disp, vm, index);

	display_timings_release(disp);

	return ret;
}
EXPORT_SYMBOL_GPL(of_get_videomode);

Annotation

Implementation Notes