[linux-2.6-block.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/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>
	15	#include <linux/io.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18
	19	/* register definitions */
	20	#define ADX_BACKLIGHT_CONTROL 0x00
	21	#define ADX_BACKLIGHT_CONTROL_ENABLE (1 << 0)
	22	#define ADX_BACKLIGHT_BRIGHTNESS 0x08
	23	#define ADX_BACKLIGHT_STATUS 0x10
	24	#define ADX_BACKLIGHT_ERROR 0x18
	25
	26	struct adxbl {
	27	void __iomem *base;
	28	};
	29
	30	static int adx_backlight_update_status(struct backlight_device *bldev)
	31	{
	32	struct adxbl *bl = bl_get_data(bldev);
	33	u32 value;
	34
	35	value = bldev->props.brightness;
	36	writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
	37
	38	value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
	39
	40	if (bldev->props.state & BL_CORE_FBBLANK)
	41	value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
	42	else
	43	value \|= ADX_BACKLIGHT_CONTROL_ENABLE;
	44
	45	writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
	46
	47	return 0;
	48	}
	49
	50	static int adx_backlight_get_brightness(struct backlight_device *bldev)
	51	{
	52	struct adxbl *bl = bl_get_data(bldev);
	53	u32 brightness;
	54
	55	brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
	56	return brightness & 0xff;
	57	}
	58
57e148b6	59	static int adx_backlight_check_fb(struct backlight_device bldev, struct fb_info fb)
3b96ea9e TR	60	{
	61	return 1;
	62	}
	63
9905a43b	64	static const struct backlight_ops adx_backlight_ops = {
3b96ea9e TR	65	.options = 0,
	66	.update_status = adx_backlight_update_status,
	67	.get_brightness = adx_backlight_get_brightness,
	68	.check_fb = adx_backlight_check_fb,
	69	};
	70
	71	static int __devinit adx_backlight_probe(struct platform_device *pdev)
	72	{
a19a6ee6	73	struct backlight_properties props;
3b96ea9e TR	74	struct backlight_device *bldev;
	75	struct resource *res;
	76	struct adxbl *bl;
	77	int ret = 0;
	78
	79	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	80	if (!res) {
	81	ret = -ENXIO;
	82	goto out;
	83	}
	84
	85	res = devm_request_mem_region(&pdev->dev, res->start,
	86	resource_size(res), res->name);
	87	if (!res) {
	88	ret = -ENXIO;
	89	goto out;
	90	}
	91
	92	bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
	93	if (!bl) {
	94	ret = -ENOMEM;
	95	goto out;
	96	}
	97
	98	bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
	99	resource_size(res));
	100	if (!bl->base) {
	101	ret = -ENXIO;
	102	goto out;
	103	}
	104
a19a6ee6 MG	105	memset(&props, 0, sizeof(struct backlight_properties));
	106	props.max_brightness = 0xff;
	107	bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev,
	108	bl, &adx_backlight_ops, &props);
3b96ea9e TR	109	if (!bldev) {
	110	ret = -ENOMEM;
	111	goto out;
	112	}
	113
3b96ea9e TR	114	bldev->props.brightness = 0xff;
	115	bldev->props.power = FB_BLANK_UNBLANK;
	116
	117	platform_set_drvdata(pdev, bldev);
	118
	119	out:
	120	return ret;
	121	}
	122
	123	static int __devexit adx_backlight_remove(struct platform_device *pdev)
	124	{
	125	struct backlight_device *bldev;
	126	int ret = 0;
	127
	128	bldev = platform_get_drvdata(pdev);
	129	bldev->props.power = FB_BLANK_UNBLANK;
	130	bldev->props.brightness = 0xff;
	131	backlight_update_status(bldev);
	132	backlight_device_unregister(bldev);
	133	platform_set_drvdata(pdev, NULL);
	134
	135	return ret;
	136	}
	137
	138	#ifdef CONFIG_PM
	139	static int adx_backlight_suspend(struct platform_device *pdev,
	140	pm_message_t state)
	141	{
	142	return 0;
	143	}
	144
	145	static int adx_backlight_resume(struct platform_device *pdev)
	146	{
	147	return 0;
	148	}
	149	#else
	150	#define adx_backlight_suspend NULL
	151	#define adx_backlight_resume NULL
	152	#endif
	153
	154	static struct platform_driver adx_backlight_driver = {
	155	.probe = adx_backlight_probe,
	156	.remove = __devexit_p(adx_backlight_remove),
	157	.suspend = adx_backlight_suspend,
	158	.resume = adx_backlight_resume,
	159	.driver = {
	160	.name = "adx-backlight",
	161	.owner = THIS_MODULE,
	162	},
	163	};
	164
	165	static int __init adx_backlight_init(void)
	166	{
	167	return platform_driver_register(&adx_backlight_driver);
	168	}
	169
	170	static void __exit adx_backlight_exit(void)
	171	{
	172	platform_driver_unregister(&adx_backlight_driver);
	173	}
	174
	175	module_init(adx_backlight_init);
	176	module_exit(adx_backlight_exit);
	177
178	MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
179	MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
180	MODULE_LICENSE("GPL v2");