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

/* drivers/video/backlight/platform_lcd.c
 *
 * Copyright 2008 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * Generic platform-device LCD power control interface.
 *
 * 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/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/of.h>
#include <linux/slab.h>

#include <video/platform_lcd.h>

struct platform_lcd {
	struct device		*us;
	struct lcd_device	*lcd;
	struct plat_lcd_data	*pdata;

	unsigned int		 power;
	unsigned int		 suspended:1;
};

static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
{
	return lcd_get_data(lcd);
}

static int platform_lcd_get_power(struct lcd_device *lcd)
{
	struct platform_lcd *plcd = to_our_lcd(lcd);

	return plcd->power;
}

static int platform_lcd_set_power(struct lcd_device *lcd, int power)
{
	struct platform_lcd *plcd = to_our_lcd(lcd);
	int lcd_power = 1;

	if (power == FB_BLANK_POWERDOWN || plcd->suspended)
		lcd_power = 0;

	plcd->pdata->set_power(plcd->pdata, lcd_power);
	plcd->power = power;

	return 0;
}

static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
{
	struct platform_lcd *plcd = to_our_lcd(lcd);
	struct plat_lcd_data *pdata = plcd->pdata;

	if (pdata->match_fb)
		return pdata->match_fb(pdata, info);

	return plcd->us->parent == info->device;
}

static struct lcd_ops platform_lcd_ops = {
	.get_power	= platform_lcd_get_power,
	.set_power	= platform_lcd_set_power,
	.check_fb	= platform_lcd_match,
};

static int platform_lcd_probe(struct platform_device *pdev)
{
	struct plat_lcd_data *pdata;
	struct platform_lcd *plcd;
	struct device *dev = &pdev->dev;
	int err;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata) {
		dev_err(dev, "no platform data supplied\n");
		return -EINVAL;
	}

	if (pdata->probe) {
		err = pdata->probe(pdata);
		if (err)
			return err;
	}

	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
			    GFP_KERNEL);
	if (!plcd)
		return -ENOMEM;

	plcd->us = dev;
	plcd->pdata = pdata;
	plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
						plcd, &platform_lcd_ops);
	if (IS_ERR(plcd->lcd)) {
		dev_err(dev, "cannot register lcd device\n");
		return PTR_ERR(plcd->lcd);
	}

	platform_set_drvdata(pdev, plcd);
	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int platform_lcd_suspend(struct device *dev)
{
	struct platform_lcd *plcd = dev_get_drvdata(dev);

	plcd->suspended = 1;
	platform_lcd_set_power(plcd->lcd, plcd->power);

	return 0;
}

static int platform_lcd_resume(struct device *dev)
{
	struct platform_lcd *plcd = dev_get_drvdata(dev);

	plcd->suspended = 0;
	platform_lcd_set_power(plcd->lcd, plcd->power);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
			platform_lcd_resume);

#ifdef CONFIG_OF
static const struct of_device_id platform_lcd_of_match[] = {
	{ .compatible = "platform-lcd" },
	{},
};
MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
#endif

static struct platform_driver platform_lcd_driver = {
	.driver		= {
		.name	= "platform-lcd",
		.pm	= &platform_lcd_pm_ops,
		.of_match_table = of_match_ptr(platform_lcd_of_match),
	},
	.probe		= platform_lcd_probe,
};

module_platform_driver(platform_lcd_driver);

MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:platform-lcd");
Commit	Line	Data
c25826a7 BD	1	/* drivers/video/backlight/platform_lcd.c
	2	*
	3	* Copyright 2008 Simtec Electronics
	4	* Ben Dooks <ben@simtec.co.uk>
	5	*
	6	* Generic platform-device LCD power control interface.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/fb.h>
	17	#include <linux/backlight.h>
	18	#include <linux/lcd.h>
52e84243	19	#include <linux/of.h>
5a0e3ad6	20	#include <linux/slab.h>
c25826a7 BD	21
	22	#include <video/platform_lcd.h>
	23
	24	struct platform_lcd {
	25	struct device *us;
	26	struct lcd_device *lcd;
	27	struct plat_lcd_data *pdata;
	28
	29	unsigned int power;
8690c70e	30	unsigned int suspended:1;
c25826a7 BD	31	};
	32
	33	static inline struct platform_lcd to_our_lcd(struct lcd_device lcd)
	34	{
	35	return lcd_get_data(lcd);
	36	}
	37
	38	static int platform_lcd_get_power(struct lcd_device *lcd)
	39	{
	40	struct platform_lcd *plcd = to_our_lcd(lcd);
	41
	42	return plcd->power;
	43	}
	44
	45	static int platform_lcd_set_power(struct lcd_device *lcd, int power)
	46	{
	47	struct platform_lcd *plcd = to_our_lcd(lcd);
	48	int lcd_power = 1;
	49
	50	if (power == FB_BLANK_POWERDOWN \|\| plcd->suspended)
	51	lcd_power = 0;
	52
	53	plcd->pdata->set_power(plcd->pdata, lcd_power);
	54	plcd->power = power;
	55
	56	return 0;
	57	}
	58
	59	static int platform_lcd_match(struct lcd_device lcd, struct fb_info info)
	60	{
	61	struct platform_lcd *plcd = to_our_lcd(lcd);
	62	struct plat_lcd_data *pdata = plcd->pdata;
	63
	64	if (pdata->match_fb)
	65	return pdata->match_fb(pdata, info);
	66
	67	return plcd->us->parent == info->device;
	68	}
	69
	70	static struct lcd_ops platform_lcd_ops = {
	71	.get_power = platform_lcd_get_power,
	72	.set_power = platform_lcd_set_power,
	73	.check_fb = platform_lcd_match,
	74	};
	75
1b9e450d	76	static int platform_lcd_probe(struct platform_device *pdev)
c25826a7 BD	77	{
	78	struct plat_lcd_data *pdata;
	79	struct platform_lcd *plcd;
	80	struct device *dev = &pdev->dev;
	81	int err;
	82
c512794c	83	pdata = dev_get_platdata(&pdev->dev);
c25826a7 BD	84	if (!pdata) {
	85	dev_err(dev, "no platform data supplied\n");
	86	return -EINVAL;
	87	}
	88
46e1915e AB	89	if (pdata->probe) {
	90	err = pdata->probe(pdata);
	91	if (err)
	92	return err;
	93	}
	94
48e78e8c MB	95	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
48e78e8c MB	96	GFP_KERNEL);
c6915be4	97	if (!plcd)
c25826a7	98	return -ENOMEM;
c25826a7 BD	99
	100	plcd->us = dev;
	101	plcd->pdata = pdata;
1f9ca1ee JH	102	plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
1f9ca1ee JH	103	plcd, &platform_lcd_ops);
c25826a7 BD	104	if (IS_ERR(plcd->lcd)) {
c25826a7 BD	105	dev_err(dev, "cannot register lcd device\n");
1f9ca1ee	106	return PTR_ERR(plcd->lcd);
c25826a7 BD	107	}
	108
	109	platform_set_drvdata(pdev, plcd);
126ed36d BD	110	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
126ed36d BD	111
c25826a7 BD	112	return 0;
	113	}
	114
1d80d0fd	115	#ifdef CONFIG_PM_SLEEP
67a67272	116	static int platform_lcd_suspend(struct device *dev)
c25826a7	117	{
67a67272	118	struct platform_lcd *plcd = dev_get_drvdata(dev);
c25826a7 BD	119
	120	plcd->suspended = 1;
	121	platform_lcd_set_power(plcd->lcd, plcd->power);
	122
	123	return 0;
	124	}
	125
67a67272	126	static int platform_lcd_resume(struct device *dev)
c25826a7	127	{
67a67272	128	struct platform_lcd *plcd = dev_get_drvdata(dev);
c25826a7 BD	129
	130	plcd->suspended = 0;
	131	platform_lcd_set_power(plcd->lcd, plcd->power);
	132
	133	return 0;
	134	}
1d80d0fd	135	#endif
67a67272 JH	136
	137	static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
	138	platform_lcd_resume);
c25826a7	139
52e84243 JH	140	#ifdef CONFIG_OF
	141	static const struct of_device_id platform_lcd_of_match[] = {
	142	{ .compatible = "platform-lcd" },
	143	{},
	144	};
	145	MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
	146	#endif
	147
c25826a7 BD	148	static struct platform_driver platform_lcd_driver = {
	149	.driver = {
	150	.name = "platform-lcd",
67a67272	151	.pm = &platform_lcd_pm_ops,
52e84243	152	.of_match_table = of_match_ptr(platform_lcd_of_match),
c25826a7 BD	153	},
c25826a7 BD	154	.probe = platform_lcd_probe,
c25826a7 BD	155	};
c25826a7 BD	156
81178e02	157	module_platform_driver(platform_lcd_driver);
c25826a7 BD	158
	159	MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
	160	MODULE_LICENSE("GPL v2");
	161	MODULE_ALIAS("platform:platform-lcd");