2 * linux/drivers/video/backlight/adx.c
4 * Copyright (C) 2009 Avionic Design GmbH
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.
10 * Written by Thierry Reding <thierry.reding@avionic-design.de>
13 #include <linux/backlight.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
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
30 static int adx_backlight_update_status(struct backlight_device *bldev)
32 struct adxbl *bl = bl_get_data(bldev);
35 value = bldev->props.brightness;
36 writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
38 value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
40 if (bldev->props.state & BL_CORE_FBBLANK)
41 value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
43 value |= ADX_BACKLIGHT_CONTROL_ENABLE;
45 writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
50 static int adx_backlight_get_brightness(struct backlight_device *bldev)
52 struct adxbl *bl = bl_get_data(bldev);
55 brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
56 return brightness & 0xff;
59 static int adx_backlight_check_fb(struct fb_info *fb)
64 static struct backlight_ops adx_backlight_ops = {
66 .update_status = adx_backlight_update_status,
67 .get_brightness = adx_backlight_get_brightness,
68 .check_fb = adx_backlight_check_fb,
71 static int __devinit adx_backlight_probe(struct platform_device *pdev)
73 struct backlight_device *bldev;
78 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
84 res = devm_request_mem_region(&pdev->dev, res->start,
85 resource_size(res), res->name);
91 bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
97 bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
104 bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl,
111 bldev->props.max_brightness = 0xff;
112 bldev->props.brightness = 0xff;
113 bldev->props.power = FB_BLANK_UNBLANK;
115 platform_set_drvdata(pdev, bldev);
121 static int __devexit adx_backlight_remove(struct platform_device *pdev)
123 struct backlight_device *bldev;
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);
137 static int adx_backlight_suspend(struct platform_device *pdev,
143 static int adx_backlight_resume(struct platform_device *pdev)
148 #define adx_backlight_suspend NULL
149 #define adx_backlight_resume NULL
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,
158 .name = "adx-backlight",
159 .owner = THIS_MODULE,
163 static int __init adx_backlight_init(void)
165 return platform_driver_register(&adx_backlight_driver);
168 static void __exit adx_backlight_exit(void)
170 platform_driver_unregister(&adx_backlight_driver);
173 module_init(adx_backlight_init);
174 module_exit(adx_backlight_exit);
176 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
177 MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
178 MODULE_LICENSE("GPL v2");