backlight: da903x: Add backlight driver for DA9030/DA9034
Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
Mike Rapoport
Richard Purdie
parent
14b7b4018f
commit
923ae48b5a
3 changed files with 209 additions and 0 deletions
|
|
@ -180,6 +180,13 @@ config BACKLIGHT_PWM
|
|||
If you have a LCD backlight adjustable by PWM, say Y to enable
|
||||
this driver.
|
||||
|
||||
config BACKLIGHT_DA903X
|
||||
tristate "Backlight Driver for DA9030/DA9034 using WLED"
|
||||
depends on BACKLIGHT_CLASS_DEVICE && PMIC_DA903X
|
||||
help
|
||||
If you have a LCD backlight connected to the WLED output of DA9030
|
||||
or DA9034 WLED output, say Y here to enable this driver.
|
||||
|
||||
config BACKLIGHT_MBP_NVIDIA
|
||||
tristate "MacBook Pro Nvidia Backlight Driver"
|
||||
depends on BACKLIGHT_CLASS_DEVICE && X86
|
||||
|
|
|
|||
|
|
@ -18,6 +18,7 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
|
|||
obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
|
||||
obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_DA903X) += da903x.o
|
||||
obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
|
||||
|
||||
|
|
|
|||
201
drivers/video/backlight/da903x.c
Normal file
201
drivers/video/backlight/da903x.c
Normal file
|
|
@ -0,0 +1,201 @@
|
|||
/*
|
||||
* Backlight driver for Dialog Semiconductor DA9030/DA9034
|
||||
*
|
||||
* Copyright (C) 2008 Compulab, Ltd.
|
||||
* Mike Rapoport <mike@compulab.co.il>
|
||||
*
|
||||
* Copyright (C) 2006-2008 Marvell International Ltd.
|
||||
* Eric Miao <eric.miao@marvell.com>
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/fb.h>
|
||||
#include <linux/backlight.h>
|
||||
#include <linux/mfd/da903x.h>
|
||||
|
||||
#define DA9030_WLED_CONTROL 0x25
|
||||
#define DA9030_WLED_CP_EN (1 << 6)
|
||||
#define DA9030_WLED_TRIM(x) ((x) & 0x7)
|
||||
|
||||
#define DA9034_WLED_CONTROL1 0x3C
|
||||
#define DA9034_WLED_CONTROL2 0x3D
|
||||
|
||||
#define DA9034_WLED_BOOST_EN (1 << 5)
|
||||
|
||||
#define DA9030_MAX_BRIGHTNESS 7
|
||||
#define DA9034_MAX_BRIGHTNESS 0x7f
|
||||
|
||||
struct da903x_backlight_data {
|
||||
struct device *da903x_dev;
|
||||
int id;
|
||||
int current_brightness;
|
||||
};
|
||||
|
||||
static int da903x_backlight_set(struct backlight_device *bl, int brightness)
|
||||
{
|
||||
struct da903x_backlight_data *data = bl_get_data(bl);
|
||||
struct device *dev = data->da903x_dev;
|
||||
uint8_t val;
|
||||
int ret = 0;
|
||||
|
||||
switch (data->id) {
|
||||
case DA9034_ID_WLED:
|
||||
ret = da903x_update(dev, DA9034_WLED_CONTROL1,
|
||||
brightness, 0x7f);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (data->current_brightness && brightness == 0)
|
||||
ret = da903x_clr_bits(dev,
|
||||
DA9034_WLED_CONTROL2,
|
||||
DA9034_WLED_BOOST_EN);
|
||||
|
||||
if (data->current_brightness == 0 && brightness)
|
||||
ret = da903x_set_bits(dev,
|
||||
DA9034_WLED_CONTROL2,
|
||||
DA9034_WLED_BOOST_EN);
|
||||
break;
|
||||
case DA9030_ID_WLED:
|
||||
val = DA9030_WLED_TRIM(brightness);
|
||||
val |= brightness ? DA9030_WLED_CP_EN : 0;
|
||||
ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
|
||||
break;
|
||||
}
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
data->current_brightness = brightness;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int da903x_backlight_update_status(struct backlight_device *bl)
|
||||
{
|
||||
int brightness = bl->props.brightness;
|
||||
|
||||
if (bl->props.power != FB_BLANK_UNBLANK)
|
||||
brightness = 0;
|
||||
|
||||
if (bl->props.fb_blank != FB_BLANK_UNBLANK)
|
||||
brightness = 0;
|
||||
|
||||
return da903x_backlight_set(bl, brightness);
|
||||
}
|
||||
|
||||
static int da903x_backlight_get_brightness(struct backlight_device *bl)
|
||||
{
|
||||
struct da903x_backlight_data *data = bl_get_data(bl);
|
||||
return data->current_brightness;
|
||||
}
|
||||
|
||||
static struct backlight_ops da903x_backlight_ops = {
|
||||
.update_status = da903x_backlight_update_status,
|
||||
.get_brightness = da903x_backlight_get_brightness,
|
||||
};
|
||||
|
||||
static int da903x_backlight_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct da903x_backlight_data *data;
|
||||
struct backlight_device *bl;
|
||||
int max_brightness;
|
||||
|
||||
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
||||
if (data == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
switch (pdev->id) {
|
||||
case DA9030_ID_WLED:
|
||||
max_brightness = DA9030_MAX_BRIGHTNESS;
|
||||
break;
|
||||
case DA9034_ID_WLED:
|
||||
max_brightness = DA9034_MAX_BRIGHTNESS;
|
||||
break;
|
||||
default:
|
||||
dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
|
||||
pdev->id);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
data->id = pdev->id;
|
||||
data->da903x_dev = pdev->dev.parent;
|
||||
data->current_brightness = 0;
|
||||
|
||||
bl = backlight_device_register(pdev->name, data->da903x_dev,
|
||||
data, &da903x_backlight_ops);
|
||||
if (IS_ERR(bl)) {
|
||||
dev_err(&pdev->dev, "failed to register backlight\n");
|
||||
return PTR_ERR(bl);
|
||||
}
|
||||
|
||||
bl->props.max_brightness = max_brightness;
|
||||
bl->props.brightness = max_brightness;
|
||||
|
||||
platform_set_drvdata(pdev, bl);
|
||||
backlight_update_status(bl);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int da903x_backlight_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct backlight_device *bl = platform_get_drvdata(pdev);
|
||||
struct da903x_backlight_data *data = bl_get_data(bl);
|
||||
|
||||
backlight_device_unregister(bl);
|
||||
kfree(data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int da903x_backlight_suspend(struct platform_device *pdev,
|
||||
pm_message_t state)
|
||||
{
|
||||
struct backlight_device *bl = platform_get_drvdata(pdev);
|
||||
return da903x_backlight_set(bl, 0);
|
||||
}
|
||||
|
||||
static int da903x_backlight_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct backlight_device *bl = platform_get_drvdata(pdev);
|
||||
|
||||
backlight_update_status(bl);
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define da903x_backlight_suspend NULL
|
||||
#define da903x_backlight_resume NULL
|
||||
#endif
|
||||
|
||||
static struct platform_driver da903x_backlight_driver = {
|
||||
.driver = {
|
||||
.name = "da903x-backlight",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = da903x_backlight_probe,
|
||||
.remove = da903x_backlight_remove,
|
||||
.suspend = da903x_backlight_suspend,
|
||||
.resume = da903x_backlight_resume,
|
||||
};
|
||||
|
||||
static int __init da903x_backlight_init(void)
|
||||
{
|
||||
return platform_driver_register(&da903x_backlight_driver);
|
||||
}
|
||||
module_init(da903x_backlight_init);
|
||||
|
||||
static void __exit da903x_backlight_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&da903x_backlight_driver);
|
||||
}
|
||||
module_exit(da903x_backlight_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
|
||||
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
|
||||
"Mike Rapoport <mike@compulab.co.il>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:da903x-backlight");
|
||||
Loading…
Reference in a new issue