[net-next-2.6.git] / drivers / video / backlight / adx_bl.c

/*
 * linux/drivers/video/backlight/adx.c
 *
 * Copyright (C) 2009 Avionic Design GmbH
 *
 * 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.
 *
 * Written by Thierry Reding <thierry.reding@avionic-design.de>
 */

#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>

/* register definitions */
#define ADX_BACKLIGHT_CONTROL		0x00
#define ADX_BACKLIGHT_CONTROL_ENABLE	(1 << 0)
#define ADX_BACKLIGHT_BRIGHTNESS	0x08
#define ADX_BACKLIGHT_STATUS		0x10
#define ADX_BACKLIGHT_ERROR		0x18

struct adxbl {
	void __iomem *base;
};

static int adx_backlight_update_status(struct backlight_device *bldev)
{
	struct adxbl *bl = bl_get_data(bldev);
	u32 value;

	value = bldev->props.brightness;
	writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);

	value = readl(bl->base + ADX_BACKLIGHT_CONTROL);

	if (bldev->props.state & BL_CORE_FBBLANK)
		value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
	else
		value |= ADX_BACKLIGHT_CONTROL_ENABLE;

	writel(value, bl->base + ADX_BACKLIGHT_CONTROL);

	return 0;
}

static int adx_backlight_get_brightness(struct backlight_device *bldev)
{
	struct adxbl *bl = bl_get_data(bldev);
	u32 brightness;

	brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
	return brightness & 0xff;
}

static int adx_backlight_check_fb(struct backlight_device *bldev, struct fb_info *fb)
{
	return 1;
}

static const struct backlight_ops adx_backlight_ops = {
	.options = 0,
	.update_status = adx_backlight_update_status,
	.get_brightness = adx_backlight_get_brightness,
	.check_fb = adx_backlight_check_fb,
};

static int __devinit adx_backlight_probe(struct platform_device *pdev)
{
	struct backlight_properties props;
	struct backlight_device *bldev;
	struct resource *res;
	struct adxbl *bl;
	int ret = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENXIO;
		goto out;
	}

	res = devm_request_mem_region(&pdev->dev, res->start,
			resource_size(res), res->name);
	if (!res) {
		ret = -ENXIO;
		goto out;
	}

	bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
	if (!bl) {
		ret = -ENOMEM;
		goto out;
	}

	bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
			resource_size(res));
	if (!bl->base) {
		ret = -ENXIO;
		goto out;
	}

	memset(&props, 0, sizeof(struct backlight_properties));
	props.max_brightness = 0xff;
	bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev,
					  bl, &adx_backlight_ops, &props);
	if (!bldev) {
		ret = -ENOMEM;
		goto out;
	}

	bldev->props.brightness = 0xff;
	bldev->props.power = FB_BLANK_UNBLANK;

	platform_set_drvdata(pdev, bldev);

out:
	return ret;
}

static int __devexit adx_backlight_remove(struct platform_device *pdev)
{
	struct backlight_device *bldev;
	int ret = 0;

	bldev = platform_get_drvdata(pdev);
	bldev->props.power = FB_BLANK_UNBLANK;
	bldev->props.brightness = 0xff;
	backlight_update_status(bldev);
	backlight_device_unregister(bldev);
	platform_set_drvdata(pdev, NULL);

	return ret;
}

#ifdef CONFIG_PM
static int adx_backlight_suspend(struct platform_device *pdev,
		pm_message_t state)
{
	return 0;
}

static int adx_backlight_resume(struct platform_device *pdev)
{
	return 0;
}
#else
#define adx_backlight_suspend NULL
#define adx_backlight_resume NULL
#endif

static struct platform_driver adx_backlight_driver = {
	.probe = adx_backlight_probe,
	.remove = __devexit_p(adx_backlight_remove),
	.suspend = adx_backlight_suspend,
	.resume = adx_backlight_resume,
	.driver = {
		.name = "adx-backlight",
		.owner = THIS_MODULE,
	},
};

static int __init adx_backlight_init(void)
{
	return platform_driver_register(&adx_backlight_driver);
}

static void __exit adx_backlight_exit(void)
{
	platform_driver_unregister(&adx_backlight_driver);
}

module_init(adx_backlight_init);
module_exit(adx_backlight_exit);

MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3b96ea9e TR	1	/*
	2	* linux/drivers/video/backlight/adx.c
	3	*
	4	* Copyright (C) 2009 Avionic Design GmbH
	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	* Written by Thierry Reding <thierry.reding@avionic-design.de>
	11	*/
	12
	13	#include <linux/backlight.h>
	14	#include <linux/fb.h>
5a0e3ad6	15	#include <linux/gfp.h>
3b96ea9e TR	16	#include <linux/io.h>
	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19
	20	/* register definitions */
	21	#define ADX_BACKLIGHT_CONTROL 0x00
	22	#define ADX_BACKLIGHT_CONTROL_ENABLE (1 << 0)
	23	#define ADX_BACKLIGHT_BRIGHTNESS 0x08
	24	#define ADX_BACKLIGHT_STATUS 0x10
	25	#define ADX_BACKLIGHT_ERROR 0x18
	26
	27	struct adxbl {
	28	void __iomem *base;
	29	};
	30
	31	static int adx_backlight_update_status(struct backlight_device *bldev)
	32	{
	33	struct adxbl *bl = bl_get_data(bldev);
	34	u32 value;
	35
	36	value = bldev->props.brightness;
	37	writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
	38
	39	value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
	40
	41	if (bldev->props.state & BL_CORE_FBBLANK)
	42	value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
	43	else
	44	value \|= ADX_BACKLIGHT_CONTROL_ENABLE;
	45
	46	writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
	47
	48	return 0;
	49	}
	50
	51	static int adx_backlight_get_brightness(struct backlight_device *bldev)
	52	{
	53	struct adxbl *bl = bl_get_data(bldev);
	54	u32 brightness;
	55
	56	brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
	57	return brightness & 0xff;
	58	}
	59
57e148b6	60	static int adx_backlight_check_fb(struct backlight_device bldev, struct fb_info fb)
3b96ea9e TR	61	{
	62	return 1;
	63	}
	64
9905a43b	65	static const struct backlight_ops adx_backlight_ops = {
3b96ea9e TR	66	.options = 0,
	67	.update_status = adx_backlight_update_status,
	68	.get_brightness = adx_backlight_get_brightness,
	69	.check_fb = adx_backlight_check_fb,
	70	};
	71
	72	static int __devinit adx_backlight_probe(struct platform_device *pdev)
	73	{
a19a6ee6	74	struct backlight_properties props;
3b96ea9e TR	75	struct backlight_device *bldev;
	76	struct resource *res;
	77	struct adxbl *bl;
	78	int ret = 0;
	79
	80	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	81	if (!res) {
	82	ret = -ENXIO;
	83	goto out;
	84	}
	85
	86	res = devm_request_mem_region(&pdev->dev, res->start,
	87	resource_size(res), res->name);
	88	if (!res) {
	89	ret = -ENXIO;
	90	goto out;
	91	}
	92
	93	bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
	94	if (!bl) {
	95	ret = -ENOMEM;
	96	goto out;
	97	}
	98
	99	bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
	100	resource_size(res));
	101	if (!bl->base) {
	102	ret = -ENXIO;
	103	goto out;
	104	}
	105
a19a6ee6 MG	106	memset(&props, 0, sizeof(struct backlight_properties));
	107	props.max_brightness = 0xff;
	108	bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev,
	109	bl, &adx_backlight_ops, &props);
3b96ea9e TR	110	if (!bldev) {
	111	ret = -ENOMEM;
	112	goto out;
	113	}
	114
3b96ea9e TR	115	bldev->props.brightness = 0xff;
	116	bldev->props.power = FB_BLANK_UNBLANK;
	117
	118	platform_set_drvdata(pdev, bldev);
	119
	120	out:
	121	return ret;
	122	}
	123
	124	static int __devexit adx_backlight_remove(struct platform_device *pdev)
	125	{
	126	struct backlight_device *bldev;
	127	int ret = 0;
	128
	129	bldev = platform_get_drvdata(pdev);
	130	bldev->props.power = FB_BLANK_UNBLANK;
	131	bldev->props.brightness = 0xff;
	132	backlight_update_status(bldev);
	133	backlight_device_unregister(bldev);
	134	platform_set_drvdata(pdev, NULL);
	135
	136	return ret;
	137	}
	138
	139	#ifdef CONFIG_PM
	140	static int adx_backlight_suspend(struct platform_device *pdev,
	141	pm_message_t state)
	142	{
	143	return 0;
	144	}
	145
	146	static int adx_backlight_resume(struct platform_device *pdev)
	147	{
	148	return 0;
	149	}
	150	#else
	151	#define adx_backlight_suspend NULL
	152	#define adx_backlight_resume NULL
	153	#endif
	154
	155	static struct platform_driver adx_backlight_driver = {
	156	.probe = adx_backlight_probe,
	157	.remove = __devexit_p(adx_backlight_remove),
	158	.suspend = adx_backlight_suspend,
	159	.resume = adx_backlight_resume,
	160	.driver = {
	161	.name = "adx-backlight",
	162	.owner = THIS_MODULE,
	163	},
	164	};
	165
	166	static int __init adx_backlight_init(void)
	167	{
	168	return platform_driver_register(&adx_backlight_driver);
	169	}
	170
	171	static void __exit adx_backlight_exit(void)
	172	{
	173	platform_driver_unregister(&adx_backlight_driver);
	174	}
	175
	176	module_init(adx_backlight_init);
	177	module_exit(adx_backlight_exit);
	178
179	MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
180	MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
181	MODULE_LICENSE("GPL v2");