mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 13:22:55 +00:00
backlight: Enable max8925 backlight
Enable max8925 backlight sub device. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Haojian Zhuang
Samuel Ortiz
parent
1ad998934e
commit
4f811ef0d4
@ -212,6 +212,13 @@ config BACKLIGHT_DA903X
|
||||
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_MAX8925
|
||||
tristate "Backlight driver for MAX8925"
|
||||
depends on BACKLIGHT_CLASS_DEVICE && MFD_MAX8925
|
||||
help
|
||||
If you have a LCD backlight connected to the WLED output of MAX8925
|
||||
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
|
||||
|
||||
@ -22,6 +22,7 @@ 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_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
|
||||
|
||||
200
drivers/video/backlight/max8925_bl.c
Normal file
200
drivers/video/backlight/max8925_bl.c
Normal file
@ -0,0 +1,200 @@
|
||||
/*
|
||||
* Backlight driver for Maxim MAX8925
|
||||
*
|
||||
* Copyright (C) 2009 Marvell International Ltd.
|
||||
* Haojian Zhuang <haojian.zhuang@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/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/fb.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/backlight.h>
|
||||
#include <linux/mfd/max8925.h>
|
||||
|
||||
#define MAX_BRIGHTNESS (0xff)
|
||||
#define MIN_BRIGHTNESS (0)
|
||||
|
||||
#define LWX_FREQ(x) (((x - 601) / 100) & 0x7)
|
||||
|
||||
struct max8925_backlight_data {
|
||||
struct max8925_chip *chip;
|
||||
|
||||
int current_brightness;
|
||||
};
|
||||
|
||||
static int max8925_backlight_set(struct backlight_device *bl, int brightness)
|
||||
{
|
||||
struct max8925_backlight_data *data = bl_get_data(bl);
|
||||
struct max8925_chip *chip = data->chip;
|
||||
unsigned char value;
|
||||
int ret;
|
||||
|
||||
if (brightness > MAX_BRIGHTNESS)
|
||||
value = MAX_BRIGHTNESS;
|
||||
else
|
||||
value = brightness;
|
||||
|
||||
ret = max8925_reg_write(chip->i2c, MAX8925_WLED_CNTL, value);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if (!data->current_brightness && brightness)
|
||||
/* enable WLED output */
|
||||
ret = max8925_set_bits(chip->i2c, MAX8925_WLED_MODE_CNTL, 1, 1);
|
||||
else if (!brightness)
|
||||
/* disable WLED output */
|
||||
ret = max8925_set_bits(chip->i2c, MAX8925_WLED_MODE_CNTL, 1, 0);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
dev_dbg(chip->dev, "set brightness %d\n", value);
|
||||
data->current_brightness = value;
|
||||
return 0;
|
||||
out:
|
||||
dev_dbg(chip->dev, "set brightness %d failure with return value:%d\n",
|
||||
value, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int max8925_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;
|
||||
|
||||
if (bl->props.state & BL_CORE_SUSPENDED)
|
||||
brightness = 0;
|
||||
|
||||
return max8925_backlight_set(bl, brightness);
|
||||
}
|
||||
|
||||
static int max8925_backlight_get_brightness(struct backlight_device *bl)
|
||||
{
|
||||
struct max8925_backlight_data *data = bl_get_data(bl);
|
||||
struct max8925_chip *chip = data->chip;
|
||||
int ret;
|
||||
|
||||
ret = max8925_reg_read(chip->i2c, MAX8925_WLED_CNTL);
|
||||
if (ret < 0)
|
||||
return -EINVAL;
|
||||
data->current_brightness = ret;
|
||||
dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct backlight_ops max8925_backlight_ops = {
|
||||
.options = BL_CORE_SUSPENDRESUME,
|
||||
.update_status = max8925_backlight_update_status,
|
||||
.get_brightness = max8925_backlight_get_brightness,
|
||||
};
|
||||
|
||||
static int __devinit max8925_backlight_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
||||
struct max8925_platform_data *max8925_pdata;
|
||||
struct max8925_backlight_pdata *pdata = NULL;
|
||||
struct max8925_backlight_data *data;
|
||||
struct backlight_device *bl;
|
||||
struct resource *res;
|
||||
char name[MAX8925_NAME_SIZE];
|
||||
unsigned char value;
|
||||
int ret;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
||||
if (res == NULL) {
|
||||
dev_err(&pdev->dev, "No I/O resource!\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (pdev->dev.parent->platform_data) {
|
||||
max8925_pdata = pdev->dev.parent->platform_data;
|
||||
pdata = max8925_pdata->backlight;
|
||||
}
|
||||
|
||||
if (!pdata) {
|
||||
dev_err(&pdev->dev, "platform data isn't assigned to "
|
||||
"backlight\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
data = kzalloc(sizeof(struct max8925_backlight_data), GFP_KERNEL);
|
||||
if (data == NULL)
|
||||
return -ENOMEM;
|
||||
strncpy(name, res->name, MAX8925_NAME_SIZE);
|
||||
data->chip = chip;
|
||||
data->current_brightness = 0;
|
||||
|
||||
bl = backlight_device_register(name, &pdev->dev, data,
|
||||
&max8925_backlight_ops);
|
||||
if (IS_ERR(bl)) {
|
||||
dev_err(&pdev->dev, "failed to register backlight\n");
|
||||
kfree(data);
|
||||
return PTR_ERR(bl);
|
||||
}
|
||||
bl->props.max_brightness = MAX_BRIGHTNESS;
|
||||
bl->props.brightness = MAX_BRIGHTNESS;
|
||||
|
||||
platform_set_drvdata(pdev, bl);
|
||||
|
||||
value = 0;
|
||||
if (pdata->lxw_scl)
|
||||
value |= (1 << 7);
|
||||
if (pdata->lxw_freq)
|
||||
value |= (LWX_FREQ(pdata->lxw_freq) << 4);
|
||||
if (pdata->dual_string)
|
||||
value |= (1 << 1);
|
||||
ret = max8925_set_bits(chip->i2c, MAX8925_WLED_MODE_CNTL, 0xfe, value);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
backlight_update_status(bl);
|
||||
return 0;
|
||||
out:
|
||||
kfree(data);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit max8925_backlight_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct backlight_device *bl = platform_get_drvdata(pdev);
|
||||
struct max8925_backlight_data *data = bl_get_data(bl);
|
||||
|
||||
backlight_device_unregister(bl);
|
||||
kfree(data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver max8925_backlight_driver = {
|
||||
.driver = {
|
||||
.name = "max8925-backlight",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = max8925_backlight_probe,
|
||||
.remove = __devexit_p(max8925_backlight_remove),
|
||||
};
|
||||
|
||||
static int __init max8925_backlight_init(void)
|
||||
{
|
||||
return platform_driver_register(&max8925_backlight_driver);
|
||||
}
|
||||
module_init(max8925_backlight_init);
|
||||
|
||||
static void __exit max8925_backlight_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&max8925_backlight_driver);
|
||||
};
|
||||
module_exit(max8925_backlight_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Backlight Driver for Maxim MAX8925");
|
||||
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:max8925-backlight");
|
||||
Loading…
Reference in New Issue
Block a user