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dm: panel: Add a panel uclass

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LCD panels can usefully be modelled as their own uclass. They can be probed
(which powers them up ready for use). If they have a backlight, this can be
enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-01-21 19:44:58 -07:00
parent 65fba5927c
commit f563dc1d19
4 changed files with 58 additions and 0 deletions
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1
drivers/video/Makefile
View file

@ -8,6 +8,7 @@
ifdef CONFIG_DM
obj-$(CONFIG_DISPLAY_PORT) += dp-uclass.o
obj-$(CONFIG_DM_VIDEO) += backlight-uclass.o
obj-$(CONFIG_DM_VIDEO) += panel-uclass.o
obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o console_normal.o
obj-$(CONFIG_DM_VIDEO) += video_bmp.o
ifdef CONFIG_DM_VIDEO

25
drivers/video/panel-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 <panel.h>
int panel_enable_backlight(struct udevice *dev)
{
struct panel_ops *ops = panel_get_ops(dev);
if (!ops->enable_backlight)
return -ENOSYS;
return ops->enable_backlight(dev);
}
UCLASS_DRIVER(panel) = {
.id = UCLASS_PANEL,
.name = "panel",
};

1
include/dm/uclass-id.h
View file

@ -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, /* Display panel, such as an LCD */
UCLASS_PANEL_BACKLIGHT, /* Backlight controller for panel */
UCLASS_PCH, /* x86 platform controller hub */
UCLASS_PCI, /* PCI bus */

31
include/panel.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 _PANEL_H
#define _PANEL_H
struct panel_ops {
/**
* enable_backlight() - Enable the panel backlight
*
* @dev: Panel device containing the backlight to enable
* @return 0 if OK, -ve on error
*/
int (*enable_backlight)(struct udevice *dev);
};
#define panel_get_ops(dev) ((struct panel_ops *)(dev)->driver->ops)
/**
* panel_enable_backlight() - Enable the panel backlight
*
* @dev: Panel device containing the backlight to enable
* @return 0 if OK, -ve on error
*/
int panel_enable_backlight(struct udevice *dev);
#endif