[net-next-2.6.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/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 __devinit 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 = kzalloc(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_mem;
	}

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

	return 0;

 err_mem:
	kfree(plcd);
	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);
	kfree(plcd);

	return 0;
}

#ifdef CONFIG_PM
static int platform_lcd_suspend(struct platform_device *pdev, pm_message_t st)
{
	struct platform_lcd *plcd = platform_get_drvdata(pdev);

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

	return 0;
}

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

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

	return 0;
}
#else
#define platform_lcd_suspend NULL
#define platform_lcd_resume NULL
#endif

static struct platform_driver platform_lcd_driver = {
	.driver		= {
		.name	= "platform-lcd",
		.owner	= THIS_MODULE,
	},
	.probe		= platform_lcd_probe,
	.remove		= __devexit_p(platform_lcd_remove),
	.suspend        = platform_lcd_suspend,
	.resume         = platform_lcd_resume,
};

static int __init platform_lcd_init(void)
{
	return platform_driver_register(&platform_lcd_driver);
}

static void __exit platform_lcd_cleanup(void)
{
	platform_driver_unregister(&platform_lcd_driver);
}

module_init(platform_lcd_init);
module_exit(platform_lcd_cleanup);

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>
5a0e3ad6	19	#include <linux/slab.h>
c25826a7 BD	20
	21	#include <video/platform_lcd.h>
	22
	23	struct platform_lcd {
	24	struct device *us;
	25	struct lcd_device *lcd;
	26	struct plat_lcd_data *pdata;
	27
	28	unsigned int power;
	29	unsigned int suspended : 1;
	30	};
	31
	32	static inline struct platform_lcd to_our_lcd(struct lcd_device lcd)
	33	{
	34	return lcd_get_data(lcd);
	35	}
	36
	37	static int platform_lcd_get_power(struct lcd_device *lcd)
	38	{
	39	struct platform_lcd *plcd = to_our_lcd(lcd);
	40
	41	return plcd->power;
	42	}
	43
	44	static int platform_lcd_set_power(struct lcd_device *lcd, int power)
	45	{
	46	struct platform_lcd *plcd = to_our_lcd(lcd);
	47	int lcd_power = 1;
	48
	49	if (power == FB_BLANK_POWERDOWN \|\| plcd->suspended)
	50	lcd_power = 0;
	51
	52	plcd->pdata->set_power(plcd->pdata, lcd_power);
	53	plcd->power = power;
	54
	55	return 0;
	56	}
	57
	58	static int platform_lcd_match(struct lcd_device lcd, struct fb_info info)
	59	{
	60	struct platform_lcd *plcd = to_our_lcd(lcd);
	61	struct plat_lcd_data *pdata = plcd->pdata;
	62
	63	if (pdata->match_fb)
	64	return pdata->match_fb(pdata, info);
	65
	66	return plcd->us->parent == info->device;
	67	}
	68
	69	static struct lcd_ops platform_lcd_ops = {
	70	.get_power = platform_lcd_get_power,
	71	.set_power = platform_lcd_set_power,
	72	.check_fb = platform_lcd_match,
	73	};
	74
	75	static int __devinit platform_lcd_probe(struct platform_device *pdev)
	76	{
	77	struct plat_lcd_data *pdata;
	78	struct platform_lcd *plcd;
	79	struct device *dev = &pdev->dev;
	80	int err;
	81
	82	pdata = pdev->dev.platform_data;
	83	if (!pdata) {
84	dev_err(dev, "no platform data supplied\n");
85	return -EINVAL;
86	}
87
88	plcd = kzalloc(sizeof(struct platform_lcd), GFP_KERNEL);
89	if (!plcd) {
90	dev_err(dev, "no memory for state\n");
91	return -ENOMEM;
92	}
93
94	plcd->us = dev;
95	plcd->pdata = pdata;
e958d3ac	96	plcd->lcd = lcd_device_register(dev_name(dev), dev,
c25826a7 BD	97	plcd, &platform_lcd_ops);
	98	if (IS_ERR(plcd->lcd)) {
	99	dev_err(dev, "cannot register lcd device\n");
	100	err = PTR_ERR(plcd->lcd);
	101	goto err_mem;
	102	}
	103
	104	platform_set_drvdata(pdev, plcd);
126ed36d BD	105	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
126ed36d BD	106
c25826a7 BD	107	return 0;
	108
	109	err_mem:
	110	kfree(plcd);
	111	return err;
	112	}
	113
	114	static int __devexit platform_lcd_remove(struct platform_device *pdev)
	115	{
	116	struct platform_lcd *plcd = platform_get_drvdata(pdev);
	117
	118	lcd_device_unregister(plcd->lcd);
	119	kfree(plcd);
	120
	121	return 0;
	122	}
	123
	124	#ifdef CONFIG_PM
	125	static int platform_lcd_suspend(struct platform_device *pdev, pm_message_t st)
	126	{
	127	struct platform_lcd *plcd = platform_get_drvdata(pdev);
	128
	129	plcd->suspended = 1;
	130	platform_lcd_set_power(plcd->lcd, plcd->power);
	131
	132	return 0;
	133	}
	134
	135	static int platform_lcd_resume(struct platform_device *pdev)
	136	{
	137	struct platform_lcd *plcd = platform_get_drvdata(pdev);
	138
	139	plcd->suspended = 0;
	140	platform_lcd_set_power(plcd->lcd, plcd->power);
	141
	142	return 0;
	143	}
	144	#else
	145	#define platform_lcd_suspend NULL
	146	#define platform_lcd_resume NULL
	147	#endif
	148
	149	static struct platform_driver platform_lcd_driver = {
	150	.driver = {
	151	.name = "platform-lcd",
	152	.owner = THIS_MODULE,
	153	},
	154	.probe = platform_lcd_probe,
	155	.remove = __devexit_p(platform_lcd_remove),
	156	.suspend = platform_lcd_suspend,
	157	.resume = platform_lcd_resume,
	158	};
	159
	160	static int __init platform_lcd_init(void)
	161	{
	162	return platform_driver_register(&platform_lcd_driver);
	163	}
	164
	165	static void __exit platform_lcd_cleanup(void)
	166	{
	167	platform_driver_unregister(&platform_lcd_driver);
	168	}
	169
	170	module_init(platform_lcd_init);
171	module_exit(platform_lcd_cleanup);
172
173	MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
174	MODULE_LICENSE("GPL v2");
175	MODULE_ALIAS("platform:platform-lcd");