[GitHub/mt8127/android_kernel_alcatel_ttab.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 = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(dev, "no platform data supplied\n");
		return -EINVAL;
	}

	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
			    GFP_KERNEL);
	if (!plcd) {
		dev_err(dev, "no memory for state\n");
		return -ENOMEM;
	}

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

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

	return 0;

 err:
	return err;
}

static int __devexit platform_lcd_remove(struct platform_device *pdev)
{
	struct platform_lcd *plcd = platform_get_drvdata(pdev);

	lcd_device_unregister(plcd->lcd);

	return 0;
}

#ifdef CONFIG_PM
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;
}

static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
			platform_lcd_resume);
#endif

#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",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &platform_lcd_pm_ops,
#endif
		.of_match_table = of_match_ptr(platform_lcd_of_match),
	},
	.probe		= platform_lcd_probe,
	.remove		= platform_lcd_remove,
};

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;
	30	unsigned int suspended : 1;
	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
	83	pdata = pdev->dev.platform_data;
	84	if (!pdata) {
	85	dev_err(dev, "no platform data supplied\n");
	86	return -EINVAL;
	87	}
	88
48e78e8c MB	89	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
48e78e8c MB	90	GFP_KERNEL);
c25826a7 BD	91	if (!plcd) {
	92	dev_err(dev, "no memory for state\n");
	93	return -ENOMEM;
	94	}
	95
	96	plcd->us = dev;
	97	plcd->pdata = pdata;
e958d3ac	98	plcd->lcd = lcd_device_register(dev_name(dev), dev,
c25826a7 BD	99	plcd, &platform_lcd_ops);
	100	if (IS_ERR(plcd->lcd)) {
	101	dev_err(dev, "cannot register lcd device\n");
	102	err = PTR_ERR(plcd->lcd);
48e78e8c	103	goto err;
c25826a7 BD	104	}
	105
	106	platform_set_drvdata(pdev, plcd);
126ed36d BD	107	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
126ed36d BD	108
c25826a7 BD	109	return 0;
c25826a7 BD	110
48e78e8c	111	err:
c25826a7 BD	112	return err;
	113	}
	114
	115	static int __devexit platform_lcd_remove(struct platform_device *pdev)
	116	{
	117	struct platform_lcd *plcd = platform_get_drvdata(pdev);
	118
	119	lcd_device_unregister(plcd->lcd);
c25826a7 BD	120
	121	return 0;
	122	}
	123
	124	#ifdef CONFIG_PM
67a67272	125	static int platform_lcd_suspend(struct device *dev)
c25826a7	126	{
67a67272	127	struct platform_lcd *plcd = dev_get_drvdata(dev);
c25826a7 BD	128
	129	plcd->suspended = 1;
	130	platform_lcd_set_power(plcd->lcd, plcd->power);
	131
	132	return 0;
	133	}
	134
67a67272	135	static int platform_lcd_resume(struct device *dev)
c25826a7	136	{
67a67272	137	struct platform_lcd *plcd = dev_get_drvdata(dev);
c25826a7 BD	138
	139	plcd->suspended = 0;
	140	platform_lcd_set_power(plcd->lcd, plcd->power);
	141
	142	return 0;
	143	}
67a67272 JH	144
	145	static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
	146	platform_lcd_resume);
c25826a7 BD	147	#endif
c25826a7 BD	148
52e84243 JH	149	#ifdef CONFIG_OF
	150	static const struct of_device_id platform_lcd_of_match[] = {
	151	{ .compatible = "platform-lcd" },
	152	{},
	153	};
	154	MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
	155	#endif
	156
c25826a7 BD	157	static struct platform_driver platform_lcd_driver = {
	158	.driver = {
	159	.name = "platform-lcd",
	160	.owner = THIS_MODULE,
67a67272 JH	161	#ifdef CONFIG_PM
	162	.pm = &platform_lcd_pm_ops,
	163	#endif
52e84243	164	.of_match_table = of_match_ptr(platform_lcd_of_match),
c25826a7 BD	165	},
c25826a7 BD	166	.probe = platform_lcd_probe,
d1723fa2	167	.remove = platform_lcd_remove,
c25826a7 BD	168	};
c25826a7 BD	169
81178e02	170	module_platform_driver(platform_lcd_driver);
c25826a7 BD	171
	172	MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
	173	MODULE_LICENSE("GPL v2");
	174	MODULE_ALIAS("platform:platform-lcd");