179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/*
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* linux/drivers/video/backlight/adx.c
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*
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* Copyright (C) 2009 Avionic Design GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Written by Thierry Reding <thierry.reding@avionic-design.de>
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*/
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#include <linux/backlight.h>
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#include <linux/fb.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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/* register definitions */
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#define ADX_BACKLIGHT_CONTROL 0x00
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#define ADX_BACKLIGHT_CONTROL_ENABLE (1 << 0)
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#define ADX_BACKLIGHT_BRIGHTNESS 0x08
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#define ADX_BACKLIGHT_STATUS 0x10
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#define ADX_BACKLIGHT_ERROR 0x18
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struct adxbl {
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void __iomem *base;
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};
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static int adx_backlight_update_status(struct backlight_device *bldev)
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{
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struct adxbl *bl = bl_get_data(bldev);
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u32 value;
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value = bldev->props.brightness;
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writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
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value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
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if (bldev->props.state & BL_CORE_FBBLANK)
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value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
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else
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value |= ADX_BACKLIGHT_CONTROL_ENABLE;
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writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
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return 0;
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}
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static int adx_backlight_get_brightness(struct backlight_device *bldev)
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{
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struct adxbl *bl = bl_get_data(bldev);
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u32 brightness;
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brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
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return brightness & 0xff;
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}
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static int adx_backlight_check_fb(struct fb_info *fb)
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{
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return 1;
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}
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static const struct backlight_ops adx_backlight_ops = {
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.options = 0,
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.update_status = adx_backlight_update_status,
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.get_brightness = adx_backlight_get_brightness,
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.check_fb = adx_backlight_check_fb,
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};
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static int __devinit adx_backlight_probe(struct platform_device *pdev)
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{
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struct backlight_device *bldev;
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struct resource *res;
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struct adxbl *bl;
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int ret = 0;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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ret = -ENXIO;
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goto out;
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}
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res = devm_request_mem_region(&pdev->dev, res->start,
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resource_size(res), res->name);
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if (!res) {
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ret = -ENXIO;
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goto out;
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}
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bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
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if (!bl) {
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ret = -ENOMEM;
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goto out;
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}
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bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
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resource_size(res));
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if (!bl->base) {
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ret = -ENXIO;
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goto out;
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}
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bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl,
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&adx_backlight_ops);
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if (!bldev) {
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ret = -ENOMEM;
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goto out;
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}
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bldev->props.max_brightness = 0xff;
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bldev->props.brightness = 0xff;
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bldev->props.power = FB_BLANK_UNBLANK;
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platform_set_drvdata(pdev, bldev);
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out:
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return ret;
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}
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static int __devexit adx_backlight_remove(struct platform_device *pdev)
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{
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struct backlight_device *bldev;
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int ret = 0;
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bldev = platform_get_drvdata(pdev);
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bldev->props.power = FB_BLANK_UNBLANK;
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bldev->props.brightness = 0xff;
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backlight_update_status(bldev);
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backlight_device_unregister(bldev);
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platform_set_drvdata(pdev, NULL);
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return ret;
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}
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#ifdef CONFIG_PM
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static int adx_backlight_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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return 0;
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}
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static int adx_backlight_resume(struct platform_device *pdev)
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{
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return 0;
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}
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#else
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#define adx_backlight_suspend NULL
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#define adx_backlight_resume NULL
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#endif
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static struct platform_driver adx_backlight_driver = {
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.probe = adx_backlight_probe,
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.remove = __devexit_p(adx_backlight_remove),
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.suspend = adx_backlight_suspend,
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.resume = adx_backlight_resume,
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.driver = {
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.name = "adx-backlight",
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.owner = THIS_MODULE,
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},
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};
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static int __init adx_backlight_init(void)
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{
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return platform_driver_register(&adx_backlight_driver);
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}
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static void __exit adx_backlight_exit(void)
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{
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platform_driver_unregister(&adx_backlight_driver);
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}
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module_init(adx_backlight_init);
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module_exit(adx_backlight_exit);
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MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
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MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
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MODULE_LICENSE("GPL v2");
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