drivers/video/backlight/adx_bl.c - leviathan-incoming in htc-msm-2.6.32

/*
 * 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 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");

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
64	static struct backlight_ops adx_backlight_ops = {
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");

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