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dm: backlight: Add a backlight uclass

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LCD panels normally have a backlight which can be controlled to illuminate
the LCD contents. Add a uclass to support this. Initially it only has a
method to enable the backlight.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-01-21 19:44:56 -07:00
parent 0e23fd81a5
commit 363bf77acc
4 changed files with 58 additions and 0 deletions
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1
drivers/video/Makefile
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@ -7,6 +7,7 @@
ifdef CONFIG_DM
obj-$(CONFIG_DISPLAY_PORT) += dp-uclass.o
obj-$(CONFIG_DM_VIDEO) += backlight-uclass.o
obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o console_normal.o
obj-$(CONFIG_DM_VIDEO) += video_bmp.o
obj-$(CONFIG_VIDEO_ROTATION) += console_rotate.o

25
drivers/video/backlight-uclass.c Normal file
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@ -0,0 +1,25 @@
/*
* Copyright (c) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <backlight.h>
int backlight_enable(struct udevice *dev)
{
const struct backlight_ops *ops = backlight_get_ops(dev);
if (!ops->enable)
return -ENOSYS;
return ops->enable(dev);
}
UCLASS_DRIVER(backlight) = {
.id = UCLASS_PANEL_BACKLIGHT,
.name = "backlight",
};

31
include/backlight.h Normal file
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@ -0,0 +1,31 @@
/*
* Copyright (c) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _BACKLIGHT_H
#define _BACKLIGHT_H
struct backlight_ops {
/**
* enable() - Enable a backlight
*
* @dev: Backlight device to enable
* @return 0 if OK, -ve on error
*/
int (*enable)(struct udevice *dev);
};
#define backlight_get_ops(dev) ((struct backlight_ops *)(dev)->driver->ops)
/**
* backlight_enable() - Enable a backlight
*
* @dev: Backlight device to enable
* @return 0 if OK, -ve on error
*/
int backlight_enable(struct udevice *dev);
#endif

1
include/dm/uclass-id.h
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@ -45,6 +45,7 @@ enum uclass_id {
UCLASS_MMC, /* SD / MMC card or chip */
UCLASS_MOD_EXP, /* RSA Mod Exp device */
UCLASS_MTD, /* Memory Technology Device (MTD) device */
UCLASS_PANEL_BACKLIGHT, /* Backlight controller for panel */
UCLASS_PCH, /* x86 platform controller hub */
UCLASS_PCI, /* PCI bus */
UCLASS_PCI_GENERIC, /* Generic PCI bus device */