backlight: Add support for the Avionic Design Xanthos backlight device.
This patch adds support for the backlight device found on Avionic Design Xanthos-based boards. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
parent
5036cc41e0
commit
3b96ea9ef8
|
@ -243,3 +243,11 @@ config BACKLIGHT_WM831X
|
|||
help
|
||||
If you have a backlight driven by the ISINK and DCDC of a
|
||||
WM831x PMIC say y to enable the backlight driver for it.
|
||||
|
||||
config BACKLIGHT_ADX
|
||||
tristate "Avionic Design Xanthos Backlight Driver"
|
||||
depends on BACKLIGHT_CLASS_DEVICE && ARCH_PXA_ADX
|
||||
default y
|
||||
help
|
||||
Say Y to enable the backlight driver on Avionic Design Xanthos-based
|
||||
boards.
|
||||
|
|
|
@ -26,4 +26,4 @@ obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
|
|||
obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
|
||||
|
||||
obj-$(CONFIG_BACKLIGHT_ADX) += adx_bl.o
|
||||
|
|
|
@ -0,0 +1,178 @@
|
|||
/*
|
||||
* 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");
|
Loading…
Reference in New Issue