mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
backlight: Add AAT2870 backlight driver
Add backlight driver for AnalogicTech AAT2870. Signed-off-by: Jin Park <jinyoungp@nvidia.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
parent
09d6292bef
commit
4b0d711be3
3 changed files with 254 additions and 0 deletions
|
@ -335,6 +335,13 @@ config BACKLIGHT_PCF50633
|
|||
If you have a backlight driven by a NXP PCF50633 MFD, say Y here to
|
||||
enable its driver.
|
||||
|
||||
config BACKLIGHT_AAT2870
|
||||
bool "AnalogicTech AAT2870 Backlight"
|
||||
depends on BACKLIGHT_CLASS_DEVICE && MFD_AAT2870_CORE
|
||||
help
|
||||
If you have a AnalogicTech AAT2870 say Y to enable the
|
||||
backlight driver.
|
||||
|
||||
endif # BACKLIGHT_CLASS_DEVICE
|
||||
|
||||
endif # BACKLIGHT_LCD_SUPPORT
|
||||
|
|
|
@ -38,4 +38,5 @@ obj-$(CONFIG_BACKLIGHT_ADP8860) += adp8860_bl.o
|
|||
obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
|
||||
obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
|
||||
obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
|
||||
|
||||
|
|
246
drivers/video/backlight/aat2870_bl.c
Normal file
246
drivers/video/backlight/aat2870_bl.c
Normal file
|
@ -0,0 +1,246 @@
|
|||
/*
|
||||
* linux/drivers/video/backlight/aat2870_bl.c
|
||||
*
|
||||
* Copyright (c) 2011, NVIDIA Corporation.
|
||||
* Author: Jin Park <jinyoungp@nvidia.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.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||||
* 02110-1301 USA
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/fb.h>
|
||||
#include <linux/backlight.h>
|
||||
#include <linux/mfd/aat2870.h>
|
||||
|
||||
struct aat2870_bl_driver_data {
|
||||
struct platform_device *pdev;
|
||||
struct backlight_device *bd;
|
||||
|
||||
int channels;
|
||||
int max_current;
|
||||
int brightness; /* current brightness */
|
||||
};
|
||||
|
||||
static inline int aat2870_brightness(struct aat2870_bl_driver_data *aat2870_bl,
|
||||
int brightness)
|
||||
{
|
||||
struct backlight_device *bd = aat2870_bl->bd;
|
||||
int val;
|
||||
|
||||
val = brightness * aat2870_bl->max_current;
|
||||
val /= bd->props.max_brightness;
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static inline int aat2870_bl_enable(struct aat2870_bl_driver_data *aat2870_bl)
|
||||
{
|
||||
struct aat2870_data *aat2870
|
||||
= dev_get_drvdata(aat2870_bl->pdev->dev.parent);
|
||||
|
||||
return aat2870->write(aat2870, AAT2870_BL_CH_EN,
|
||||
(u8)aat2870_bl->channels);
|
||||
}
|
||||
|
||||
static inline int aat2870_bl_disable(struct aat2870_bl_driver_data *aat2870_bl)
|
||||
{
|
||||
struct aat2870_data *aat2870
|
||||
= dev_get_drvdata(aat2870_bl->pdev->dev.parent);
|
||||
|
||||
return aat2870->write(aat2870, AAT2870_BL_CH_EN, 0x0);
|
||||
}
|
||||
|
||||
static int aat2870_bl_get_brightness(struct backlight_device *bd)
|
||||
{
|
||||
return bd->props.brightness;
|
||||
}
|
||||
|
||||
static int aat2870_bl_update_status(struct backlight_device *bd)
|
||||
{
|
||||
struct aat2870_bl_driver_data *aat2870_bl = dev_get_drvdata(&bd->dev);
|
||||
struct aat2870_data *aat2870 =
|
||||
dev_get_drvdata(aat2870_bl->pdev->dev.parent);
|
||||
int brightness = bd->props.brightness;
|
||||
int ret;
|
||||
|
||||
if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
|
||||
dev_err(&bd->dev, "invalid brightness, %d\n", brightness);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
|
||||
bd->props.brightness, bd->props.power, bd->props.state);
|
||||
|
||||
if ((bd->props.power != FB_BLANK_UNBLANK) ||
|
||||
(bd->props.state & BL_CORE_FBBLANK) ||
|
||||
(bd->props.state & BL_CORE_SUSPENDED))
|
||||
brightness = 0;
|
||||
|
||||
ret = aat2870->write(aat2870, AAT2870_BLM,
|
||||
(u8)aat2870_brightness(aat2870_bl, brightness));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (brightness == 0) {
|
||||
ret = aat2870_bl_disable(aat2870_bl);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
} else if (aat2870_bl->brightness == 0) {
|
||||
ret = aat2870_bl_enable(aat2870_bl);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
aat2870_bl->brightness = brightness;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static const struct backlight_ops aat2870_bl_ops = {
|
||||
.options = BL_CORE_SUSPENDRESUME,
|
||||
.get_brightness = aat2870_bl_get_brightness,
|
||||
.update_status = aat2870_bl_update_status,
|
||||
.check_fb = aat2870_bl_check_fb,
|
||||
};
|
||||
|
||||
static int aat2870_bl_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct aat2870_bl_platform_data *pdata = pdev->dev.platform_data;
|
||||
struct aat2870_bl_driver_data *aat2870_bl;
|
||||
struct backlight_device *bd;
|
||||
struct backlight_properties props;
|
||||
int ret = 0;
|
||||
|
||||
if (!pdata) {
|
||||
dev_err(&pdev->dev, "No platform data\n");
|
||||
ret = -ENXIO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (pdev->id != AAT2870_ID_BL) {
|
||||
dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
aat2870_bl = kzalloc(sizeof(struct aat2870_bl_driver_data), GFP_KERNEL);
|
||||
if (!aat2870_bl) {
|
||||
dev_err(&pdev->dev,
|
||||
"Failed to allocate memory for aat2870 backlight\n");
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
memset(&props, 0, sizeof(struct backlight_properties));
|
||||
|
||||
props.type = BACKLIGHT_RAW;
|
||||
bd = backlight_device_register("aat2870-backlight", &pdev->dev,
|
||||
aat2870_bl, &aat2870_bl_ops, &props);
|
||||
if (!bd) {
|
||||
dev_err(&pdev->dev,
|
||||
"Failed allocate memory for backlight device\n");
|
||||
ret = -ENOMEM;
|
||||
goto out_kfree;
|
||||
}
|
||||
|
||||
aat2870_bl->pdev = pdev;
|
||||
platform_set_drvdata(pdev, aat2870_bl);
|
||||
|
||||
aat2870_bl->bd = bd;
|
||||
|
||||
if (pdata->channels > 0)
|
||||
aat2870_bl->channels = pdata->channels;
|
||||
else
|
||||
aat2870_bl->channels = AAT2870_BL_CH_ALL;
|
||||
|
||||
if (pdata->max_brightness > 0)
|
||||
aat2870_bl->max_current = pdata->max_current;
|
||||
else
|
||||
aat2870_bl->max_current = AAT2870_CURRENT_27_9;
|
||||
|
||||
if (pdata->max_brightness > 0)
|
||||
bd->props.max_brightness = pdata->max_brightness;
|
||||
else
|
||||
bd->props.max_brightness = 255;
|
||||
|
||||
aat2870_bl->brightness = 0;
|
||||
bd->props.power = FB_BLANK_UNBLANK;
|
||||
bd->props.brightness = bd->props.max_brightness;
|
||||
|
||||
ret = aat2870_bl_update_status(bd);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "Failed to initialize\n");
|
||||
goto out_bl_dev_unregister;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_bl_dev_unregister:
|
||||
backlight_device_unregister(bd);
|
||||
out_kfree:
|
||||
kfree(aat2870_bl);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int aat2870_bl_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev);
|
||||
struct backlight_device *bd = aat2870_bl->bd;
|
||||
|
||||
bd->props.power = FB_BLANK_POWERDOWN;
|
||||
bd->props.brightness = 0;
|
||||
backlight_update_status(bd);
|
||||
|
||||
backlight_device_unregister(bd);
|
||||
kfree(aat2870_bl);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver aat2870_bl_driver = {
|
||||
.driver = {
|
||||
.name = "aat2870-backlight",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = aat2870_bl_probe,
|
||||
.remove = aat2870_bl_remove,
|
||||
};
|
||||
|
||||
static int __init aat2870_bl_init(void)
|
||||
{
|
||||
return platform_driver_register(&aat2870_bl_driver);
|
||||
}
|
||||
subsys_initcall(aat2870_bl_init);
|
||||
|
||||
static void __exit aat2870_bl_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&aat2870_bl_driver);
|
||||
}
|
||||
module_exit(aat2870_bl_exit);
|
||||
|
||||
MODULE_DESCRIPTION("AnalogicTech AAT2870 Backlight");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
|
Loading…
Reference in a new issue