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 ---
drivers/video/Makefile | 1 + drivers/video/backlight-uclass.c | 25 +++++++++++++++++++++++++ include/backlight.h | 31 +++++++++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + 4 files changed, 58 insertions(+) create mode 100644 drivers/video/backlight-uclass.c create mode 100644 include/backlight.h
diff --git a/drivers/video/Makefile b/drivers/video/Makefile index ee04629..fa90721 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -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 diff --git a/drivers/video/backlight-uclass.c b/drivers/video/backlight-uclass.c new file mode 100644 index 0000000..0238289 --- /dev/null +++ b/drivers/video/backlight-uclass.c @@ -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", +}; diff --git a/include/backlight.h b/include/backlight.h new file mode 100644 index 0000000..90e1d98 --- /dev/null +++ b/include/backlight.h @@ -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 diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index 8f0381d..5421981 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -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 */