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authorSimon Glass <sjg@chromium.org>2016-01-21 19:44:56 -0700
committerSimon Glass <sjg@chromium.org>2016-01-21 20:42:36 -0700
commit363bf77acc31bf0db66e1d942860d79339e29b88 (patch)
tree8443dffc47445836f252a6dec1efd6451ab37cc0
parent0e23fd81a54f92655315a1bc3aec85d1a3dd9ae8 (diff)
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>
-rw-r--r--drivers/video/Makefile1
-rw-r--r--drivers/video/backlight-uclass.c25
-rw-r--r--include/backlight.h31
-rw-r--r--include/dm/uclass-id.h1
4 files changed, 58 insertions, 0 deletions
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index ee046296e6..fa907210cf 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 0000000000..0238289d1b
--- /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 0000000000..90e1d981e1
--- /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 8f0381d6e5..5421981eb5 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 */