[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 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_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;
	}

	bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl,
			&adx_backlight_ops);
	if (!bldev) {
		ret = -ENOMEM;
		goto out;
	}

	bldev->props.max_brightness = 0xff;
	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
	59	static int adx_backlight_check_fb(struct fb_info *fb)
	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	{
	73	struct backlight_device *bldev;
	74	struct resource *res;
	75	struct adxbl *bl;
	76	int ret = 0;
	77
	78	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	79	if (!res) {
	80	ret = -ENXIO;
	81	goto out;
	82	}
	83
	84	res = devm_request_mem_region(&pdev->dev, res->start,
	85	resource_size(res), res->name);
	86	if (!res) {
	87	ret = -ENXIO;
	88	goto out;
	89	}
	90
	91	bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
	92	if (!bl) {
	93	ret = -ENOMEM;
	94	goto out;
	95	}
	96
	97	bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
	98	resource_size(res));
	99	if (!bl->base) {
	100	ret = -ENXIO;
	101	goto out;
	102	}
	103
	104	bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl,
	105	&adx_backlight_ops);
	106	if (!bldev) {
	107	ret = -ENOMEM;
	108	goto out;
	109	}
	110
	111	bldev->props.max_brightness = 0xff;
	112	bldev->props.brightness = 0xff;
	113	bldev->props.power = FB_BLANK_UNBLANK;
	114
	115	platform_set_drvdata(pdev, bldev);
	116
	117	out:
	118	return ret;
	119	}
	120
	121	static int __devexit adx_backlight_remove(struct platform_device *pdev)
	122	{
	123	struct backlight_device *bldev;
	124	int ret = 0;
	125
	126	bldev = platform_get_drvdata(pdev);
	127	bldev->props.power = FB_BLANK_UNBLANK;
	128	bldev->props.brightness = 0xff;
129	backlight_update_status(bldev);
130	backlight_device_unregister(bldev);
131	platform_set_drvdata(pdev, NULL);
132
133	return ret;
134	}
135
136	#ifdef CONFIG_PM
137	static int adx_backlight_suspend(struct platform_device *pdev,
138	pm_message_t state)
139	{
140	return 0;
141	}
142
143	static int adx_backlight_resume(struct platform_device *pdev)
144	{
145	return 0;
146	}
147	#else
148	#define adx_backlight_suspend NULL
149	#define adx_backlight_resume NULL
150	#endif
151
152	static struct platform_driver adx_backlight_driver = {
153	.probe = adx_backlight_probe,
154	.remove = __devexit_p(adx_backlight_remove),
155	.suspend = adx_backlight_suspend,
156	.resume = adx_backlight_resume,
157	.driver = {
158	.name = "adx-backlight",
159	.owner = THIS_MODULE,
160	},
161	};
162
163	static int __init adx_backlight_init(void)
164	{
165	return platform_driver_register(&adx_backlight_driver);
166	}
167
168	static void __exit adx_backlight_exit(void)
169	{
170	platform_driver_unregister(&adx_backlight_driver);
171	}
172
173	module_init(adx_backlight_init);
174	module_exit(adx_backlight_exit);
175
176	MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
177	MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
178	MODULE_LICENSE("GPL v2");