mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 16:24:13 +08:00
backlight: Enable backlight in 88pm860x
At most, three backlight device can be supported in 88pm860x driver. 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
a16122bcac
commit
d07e8bf83f
304
drivers/video/backlight/88pm860x_bl.c
Normal file
304
drivers/video/backlight/88pm860x_bl.c
Normal file
@ -0,0 +1,304 @@
|
||||
/*
|
||||
* Backlight driver for Marvell Semiconductor 88PM8606
|
||||
*
|
||||
* 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/88pm860x.h>
|
||||
|
||||
#define MAX_BRIGHTNESS (0xFF)
|
||||
#define MIN_BRIGHTNESS (0)
|
||||
|
||||
#define CURRENT_MASK (0x1F << 1)
|
||||
|
||||
struct pm860x_backlight_data {
|
||||
struct pm860x_chip *chip;
|
||||
struct i2c_client *i2c;
|
||||
int current_brightness;
|
||||
int port;
|
||||
int pwm;
|
||||
int iset;
|
||||
};
|
||||
|
||||
static inline int wled_a(int port)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = ((port - PM8606_BACKLIGHT1) << 1) + 2;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int wled_b(int port)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* WLED2 & WLED3 share the same IDC */
|
||||
static inline int wled_idc(int port)
|
||||
{
|
||||
int ret;
|
||||
|
||||
switch (port) {
|
||||
case PM8606_BACKLIGHT1:
|
||||
case PM8606_BACKLIGHT2:
|
||||
ret = ((port - PM8606_BACKLIGHT1) << 1) + 3;
|
||||
break;
|
||||
case PM8606_BACKLIGHT3:
|
||||
default:
|
||||
ret = ((port - PM8606_BACKLIGHT2) << 1) + 3;
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
|
||||
{
|
||||
struct pm860x_backlight_data *data = bl_get_data(bl);
|
||||
struct pm860x_chip *chip = data->chip;
|
||||
unsigned char value;
|
||||
int ret;
|
||||
|
||||
if (brightness > MAX_BRIGHTNESS)
|
||||
value = MAX_BRIGHTNESS;
|
||||
else
|
||||
value = brightness;
|
||||
|
||||
ret = pm860x_reg_write(data->i2c, wled_a(data->port), value);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if ((data->current_brightness == 0) && brightness) {
|
||||
if (data->iset) {
|
||||
ret = pm860x_set_bits(data->i2c, wled_idc(data->port),
|
||||
CURRENT_MASK, data->iset);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
}
|
||||
if (data->pwm) {
|
||||
ret = pm860x_set_bits(data->i2c, PM8606_PWM,
|
||||
PM8606_PWM_FREQ_MASK, data->pwm);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
}
|
||||
if (brightness == MAX_BRIGHTNESS) {
|
||||
/* set WLED_ON bit as 100% */
|
||||
ret = pm860x_set_bits(data->i2c, wled_b(data->port),
|
||||
PM8606_WLED_ON, PM8606_WLED_ON);
|
||||
}
|
||||
} else {
|
||||
if (brightness == MAX_BRIGHTNESS) {
|
||||
/* set WLED_ON bit as 100% */
|
||||
ret = pm860x_set_bits(data->i2c, wled_b(data->port),
|
||||
PM8606_WLED_ON, PM8606_WLED_ON);
|
||||
} else {
|
||||
/* clear WLED_ON bit since it's not 100% */
|
||||
ret = pm860x_set_bits(data->i2c, wled_b(data->port),
|
||||
PM8606_WLED_ON, 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 pm860x_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 pm860x_backlight_set(bl, brightness);
|
||||
}
|
||||
|
||||
static int pm860x_backlight_get_brightness(struct backlight_device *bl)
|
||||
{
|
||||
struct pm860x_backlight_data *data = bl_get_data(bl);
|
||||
struct pm860x_chip *chip = data->chip;
|
||||
int ret;
|
||||
|
||||
ret = pm860x_reg_read(data->i2c, wled_a(data->port));
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
data->current_brightness = ret;
|
||||
dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
|
||||
return data->current_brightness;
|
||||
out:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static struct backlight_ops pm860x_backlight_ops = {
|
||||
.options = BL_CORE_SUSPENDRESUME,
|
||||
.update_status = pm860x_backlight_update_status,
|
||||
.get_brightness = pm860x_backlight_get_brightness,
|
||||
};
|
||||
|
||||
static int __check_device(struct pm860x_backlight_pdata *pdata, char *name)
|
||||
{
|
||||
struct pm860x_backlight_pdata *p = pdata;
|
||||
int ret = -EINVAL;
|
||||
|
||||
while (p && p->id) {
|
||||
if ((p->id != PM8606_ID_BACKLIGHT) || (p->flags < 0))
|
||||
break;
|
||||
|
||||
if (!strncmp(name, pm860x_backlight_name[p->flags],
|
||||
MFD_NAME_SIZE)) {
|
||||
ret = (int)p->flags;
|
||||
break;
|
||||
}
|
||||
p++;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int pm860x_backlight_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
||||
struct pm860x_platform_data *pm860x_pdata;
|
||||
struct pm860x_backlight_pdata *pdata = NULL;
|
||||
struct pm860x_backlight_data *data;
|
||||
struct backlight_device *bl;
|
||||
struct resource *res;
|
||||
unsigned char value;
|
||||
char name[MFD_NAME_SIZE];
|
||||
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) {
|
||||
pm860x_pdata = pdev->dev.parent->platform_data;
|
||||
pdata = pm860x_pdata->backlight;
|
||||
}
|
||||
if (pdata == NULL) {
|
||||
dev_err(&pdev->dev, "platform data isn't assigned to "
|
||||
"backlight\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
data = kzalloc(sizeof(struct pm860x_backlight_data), GFP_KERNEL);
|
||||
if (data == NULL)
|
||||
return -ENOMEM;
|
||||
strncpy(name, res->name, MFD_NAME_SIZE);
|
||||
data->chip = chip;
|
||||
data->i2c = (chip->id == CHIP_PM8606) ? chip->client \
|
||||
: chip->companion;
|
||||
data->current_brightness = MAX_BRIGHTNESS;
|
||||
data->pwm = pdata->pwm;
|
||||
data->iset = pdata->iset;
|
||||
data->port = __check_device(pdata, name);
|
||||
if (data->port < 0) {
|
||||
dev_err(&pdev->dev, "wrong platform data is assigned");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
bl = backlight_device_register(name, &pdev->dev, data,
|
||||
&pm860x_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);
|
||||
|
||||
/* Enable reference VSYS */
|
||||
ret = pm860x_reg_read(data->i2c, PM8606_VSYS);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
if ((ret & PM8606_VSYS_EN) == 0) {
|
||||
value = ret | PM8606_VSYS_EN;
|
||||
ret = pm860x_reg_write(data->i2c, PM8606_VSYS, value);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
}
|
||||
/* Enable reference OSC */
|
||||
ret = pm860x_reg_read(data->i2c, PM8606_MISC);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
if ((ret & PM8606_MISC_OSC_EN) == 0) {
|
||||
value = ret | PM8606_MISC_OSC_EN;
|
||||
ret = pm860x_reg_write(data->i2c, PM8606_MISC, value);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
}
|
||||
/* read current backlight */
|
||||
ret = pm860x_backlight_get_brightness(bl);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
backlight_update_status(bl);
|
||||
return 0;
|
||||
out:
|
||||
kfree(data);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int pm860x_backlight_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct backlight_device *bl = platform_get_drvdata(pdev);
|
||||
struct pm860x_backlight_data *data = bl_get_data(bl);
|
||||
|
||||
backlight_device_unregister(bl);
|
||||
kfree(data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver pm860x_backlight_driver = {
|
||||
.driver = {
|
||||
.name = "88pm860x-backlight",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = pm860x_backlight_probe,
|
||||
.remove = pm860x_backlight_remove,
|
||||
};
|
||||
|
||||
static int __init pm860x_backlight_init(void)
|
||||
{
|
||||
return platform_driver_register(&pm860x_backlight_driver);
|
||||
}
|
||||
module_init(pm860x_backlight_init);
|
||||
|
||||
static void __exit pm860x_backlight_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&pm860x_backlight_driver);
|
||||
}
|
||||
module_exit(pm860x_backlight_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
|
||||
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:88pm860x-backlight");
|
||||
@ -262,3 +262,9 @@ config BACKLIGHT_ADP5520
|
||||
To compile this driver as a module, choose M here: the module will
|
||||
be called adp5520_bl.
|
||||
|
||||
config BACKLIGHT_88PM860X
|
||||
tristate "Backlight Driver for 88PM8606 using WLED"
|
||||
depends on BACKLIGHT_CLASS_DEVICE && MFD_88PM860X
|
||||
help
|
||||
Say Y to enable the backlight driver for Marvell 88PM8606.
|
||||
|
||||
|
||||
@ -28,4 +28,5 @@ obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_ADX) += adx_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_ADP5520) += adp5520_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user