1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/video/backlight/generic_bl.c b/drivers/video/backlight/generic_bl.c
new file mode 100644
index 000000000000..6d27f62fdcd0
--- /dev/null
+++ b/drivers/video/backlight/generic_bl.c
@@ -0,0 +1,147 @@
+/*
+ *  Generic Backlight Driver
+ *
+ *  Copyright (c) 2004-2008 Richard Purdie
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+static int genericbl_intensity;
+static struct backlight_device *generic_backlight_device;
+static struct generic_bl_info *bl_machinfo;
+
+/* Flag to signal when the battery is low */
+#define GENERICBL_BATTLOW       BL_CORE_DRIVER1
+
+static int genericbl_send_intensity(struct backlight_device *bd)
+{
+	int intensity = bd->props.brightness;
+
+	if (bd->props.power != FB_BLANK_UNBLANK)
+		intensity = 0;
+	if (bd->props.state & BL_CORE_FBBLANK)
+		intensity = 0;
+	if (bd->props.state & BL_CORE_SUSPENDED)
+		intensity = 0;
+	if (bd->props.state & GENERICBL_BATTLOW)
+		intensity &= bl_machinfo->limit_mask;
+
+	bl_machinfo->set_bl_intensity(intensity);
+
+	genericbl_intensity = intensity;
+
+	if (bl_machinfo->kick_battery)
+		bl_machinfo->kick_battery();
+
+	return 0;
+}
+
+static int genericbl_get_intensity(struct backlight_device *bd)
+{
+	return genericbl_intensity;
+}
+
+/*
+ * Called when the battery is low to limit the backlight intensity.
+ * If limit==0 clear any limit, otherwise limit the intensity
+ */
+void corgibl_limit_intensity(int limit)
+{
+	struct backlight_device *bd = generic_backlight_device;
+
+	mutex_lock(&bd->ops_lock);
+	if (limit)
+		bd->props.state |= GENERICBL_BATTLOW;
+	else
+		bd->props.state &= ~GENERICBL_BATTLOW;
+	backlight_update_status(generic_backlight_device);
+	mutex_unlock(&bd->ops_lock);
+}
+EXPORT_SYMBOL(corgibl_limit_intensity);
+
+static struct backlight_ops genericbl_ops = {
+	.options = BL_CORE_SUSPENDRESUME,
+	.get_brightness = genericbl_get_intensity,
+	.update_status  = genericbl_send_intensity,
+};
+
+static int genericbl_probe(struct platform_device *pdev)
+{
+	struct generic_bl_info *machinfo = pdev->dev.platform_data;
+	const char *name = "generic-bl";
+	struct backlight_device *bd;
+
+	bl_machinfo = machinfo;
+	if (!machinfo->limit_mask)
+		machinfo->limit_mask = -1;
+
+	if (machinfo->name)
+		name = machinfo->name;
+
+	bd = backlight_device_register (name,
+		&pdev->dev, NULL, &genericbl_ops);
+	if (IS_ERR (bd))
+		return PTR_ERR (bd);
+
+	platform_set_drvdata(pdev, bd);
+
+	bd->props.max_brightness = machinfo->max_intensity;
+	bd->props.power = FB_BLANK_UNBLANK;
+	bd->props.brightness = machinfo->default_intensity;
+	backlight_update_status(bd);
+
+	generic_backlight_device = bd;
+
+	printk("Generic Backlight Driver Initialized.\n");
+	return 0;
+}
+
+static int genericbl_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bd = platform_get_drvdata(pdev);
+
+	bd->props.power = 0;
+	bd->props.brightness = 0;
+	backlight_update_status(bd);
+
+	backlight_device_unregister(bd);
+
+	printk("Generic Backlight Driver Unloaded\n");
+	return 0;
+}
+
+static struct platform_driver genericbl_driver = {
+	.probe		= genericbl_probe,
+	.remove		= genericbl_remove,
+	.driver		= {
+		.name	= "generic-bl",
+	},
+};
+
+static int __init genericbl_init(void)
+{
+	return platform_driver_register(&genericbl_driver);
+}
+
+static void __exit genericbl_exit(void)
+{
+	platform_driver_unregister(&genericbl_driver);
+}
+
+module_init(genericbl_init);
+module_exit(genericbl_exit);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
+MODULE_DESCRIPTION("Generic Backlight Driver");
+MODULE_LICENSE("GPL");