[linux-2.6-block.git] / drivers / video / backlight / generic_bl.c

/*
 *  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;
}

static const 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 backlight_properties props;
	struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
	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;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = machinfo->max_intensity;
	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
					NULL, &genericbl_ops, &props);
	if (IS_ERR(bd))
		return PTR_ERR(bd);

	platform_set_drvdata(pdev, bd);

	bd->props.power = FB_BLANK_UNBLANK;
	bd->props.brightness = machinfo->default_intensity;
	backlight_update_status(bd);

	generic_backlight_device = bd;

	dev_info(&pdev->dev, "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);

	dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
	return 0;
}

static struct platform_driver genericbl_driver = {
	.probe		= genericbl_probe,
	.remove		= genericbl_remove,
	.driver		= {
		.name	= "generic-bl",
	},
};

module_platform_driver(genericbl_driver);

MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Generic Backlight Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
d00ba726 RP	1	/*
	2	* Generic Backlight Driver
	3	*
	4	* Copyright (c) 2004-2008 Richard Purdie
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/mutex.h>
	17	#include <linux/fb.h>
	18	#include <linux/backlight.h>
	19
	20	static int genericbl_intensity;
	21	static struct backlight_device *generic_backlight_device;
	22	static struct generic_bl_info *bl_machinfo;
	23
	24	/* Flag to signal when the battery is low */
	25	#define GENERICBL_BATTLOW BL_CORE_DRIVER1
	26
	27	static int genericbl_send_intensity(struct backlight_device *bd)
	28	{
	29	int intensity = bd->props.brightness;
	30
	31	if (bd->props.power != FB_BLANK_UNBLANK)
	32	intensity = 0;
	33	if (bd->props.state & BL_CORE_FBBLANK)
	34	intensity = 0;
	35	if (bd->props.state & BL_CORE_SUSPENDED)
	36	intensity = 0;
	37	if (bd->props.state & GENERICBL_BATTLOW)
	38	intensity &= bl_machinfo->limit_mask;
	39
	40	bl_machinfo->set_bl_intensity(intensity);
	41
	42	genericbl_intensity = intensity;
	43
	44	if (bl_machinfo->kick_battery)
	45	bl_machinfo->kick_battery();
	46
	47	return 0;
	48	}
	49
	50	static int genericbl_get_intensity(struct backlight_device *bd)
	51	{
	52	return genericbl_intensity;
	53	}
	54
9905a43b	55	static const struct backlight_ops genericbl_ops = {
d00ba726 RP	56	.options = BL_CORE_SUSPENDRESUME,
	57	.get_brightness = genericbl_get_intensity,
	58	.update_status = genericbl_send_intensity,
	59	};
	60
	61	static int genericbl_probe(struct platform_device *pdev)
	62	{
a19a6ee6	63	struct backlight_properties props;
c512794c	64	struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
d00ba726 RP	65	const char *name = "generic-bl";
	66	struct backlight_device *bd;
	67
	68	bl_machinfo = machinfo;
	69	if (!machinfo->limit_mask)
	70	machinfo->limit_mask = -1;
	71
	72	if (machinfo->name)
	73	name = machinfo->name;
	74
a19a6ee6	75	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	76	props.type = BACKLIGHT_RAW;
a19a6ee6	77	props.max_brightness = machinfo->max_intensity;
de2efd2a JH	78	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
de2efd2a JH	79	NULL, &genericbl_ops, &props);
933bd9b3 JH	80	if (IS_ERR(bd))
933bd9b3 JH	81	return PTR_ERR(bd);
d00ba726 RP	82
	83	platform_set_drvdata(pdev, bd);
	84
d00ba726 RP	85	bd->props.power = FB_BLANK_UNBLANK;
	86	bd->props.brightness = machinfo->default_intensity;
	87	backlight_update_status(bd);
	88
	89	generic_backlight_device = bd;
	90
8ab5aa67	91	dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n");
d00ba726 RP	92	return 0;
	93	}
	94
	95	static int genericbl_remove(struct platform_device *pdev)
	96	{
	97	struct backlight_device *bd = platform_get_drvdata(pdev);
	98
	99	bd->props.power = 0;
	100	bd->props.brightness = 0;
	101	backlight_update_status(bd);
	102
8ab5aa67	103	dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
d00ba726 RP	104	return 0;
	105	}
	106
	107	static struct platform_driver genericbl_driver = {
	108	.probe = genericbl_probe,
	109	.remove = genericbl_remove,
	110	.driver = {
	111	.name = "generic-bl",
	112	},
	113	};
	114
81178e02	115	module_platform_driver(genericbl_driver);
d00ba726 RP	116
	117	MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
	118	MODULE_DESCRIPTION("Generic Backlight Driver");
	119	MODULE_LICENSE("GPL");