dm: backlight: Add a backlight uclass
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>
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@ -7,6 +7,7 @@
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ifdef CONFIG_DM
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ifdef CONFIG_DM
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obj-$(CONFIG_DISPLAY_PORT) += dp-uclass.o
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obj-$(CONFIG_DISPLAY_PORT) += dp-uclass.o
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obj-$(CONFIG_DM_VIDEO) += backlight-uclass.o
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obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o console_normal.o
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obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o console_normal.o
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obj-$(CONFIG_DM_VIDEO) += video_bmp.o
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obj-$(CONFIG_DM_VIDEO) += video_bmp.o
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obj-$(CONFIG_VIDEO_ROTATION) += console_rotate.o
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obj-$(CONFIG_VIDEO_ROTATION) += console_rotate.o
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@ -0,0 +1,25 @@
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/*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <backlight.h>
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int backlight_enable(struct udevice *dev)
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{
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const struct backlight_ops *ops = backlight_get_ops(dev);
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if (!ops->enable)
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return -ENOSYS;
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return ops->enable(dev);
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}
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UCLASS_DRIVER(backlight) = {
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.id = UCLASS_PANEL_BACKLIGHT,
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.name = "backlight",
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};
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@ -0,0 +1,31 @@
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/*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _BACKLIGHT_H
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#define _BACKLIGHT_H
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struct backlight_ops {
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/**
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* enable() - Enable a backlight
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*
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* @dev: Backlight device to enable
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* @return 0 if OK, -ve on error
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*/
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int (*enable)(struct udevice *dev);
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};
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#define backlight_get_ops(dev) ((struct backlight_ops *)(dev)->driver->ops)
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/**
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* backlight_enable() - Enable a backlight
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*
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* @dev: Backlight device to enable
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* @return 0 if OK, -ve on error
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*/
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int backlight_enable(struct udevice *dev);
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#endif
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@ -45,6 +45,7 @@ enum uclass_id {
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UCLASS_MMC, /* SD / MMC card or chip */
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UCLASS_MMC, /* SD / MMC card or chip */
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UCLASS_MOD_EXP, /* RSA Mod Exp device */
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UCLASS_MOD_EXP, /* RSA Mod Exp device */
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UCLASS_MTD, /* Memory Technology Device (MTD) device */
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UCLASS_MTD, /* Memory Technology Device (MTD) device */
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UCLASS_PANEL_BACKLIGHT, /* Backlight controller for panel */
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UCLASS_PCH, /* x86 platform controller hub */
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UCLASS_PCH, /* x86 platform controller hub */
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UCLASS_PCI, /* PCI bus */
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UCLASS_PCI, /* PCI bus */
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UCLASS_PCI_GENERIC, /* Generic PCI bus device */
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UCLASS_PCI_GENERIC, /* Generic PCI bus device */
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