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/*
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/pmic_light.h>
#include <linux/pmic_external.h>
/*
#define MXC_MAX_INTENSITY 255
#define MXC_DEFAULT_INTENSITY 127
*/
/* workaround for atlas hot issue */
#define MXC_MAX_INTENSITY 128
#define MXC_DEFAULT_INTENSITY 64
#define MXC_INTENSITY_OFF 0
struct mxcbl_dev_data {
int intensity;
int suspend;
};
static int mxcbl_set_intensity(struct backlight_device *bd)
{
int brightness = bd->props.brightness;
struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
if (bd->props.power != FB_BLANK_UNBLANK)
brightness = 0;
if (bd->props.fb_blank != FB_BLANK_UNBLANK)
brightness = 0;
if (devdata->suspend)
brightness = 0;
brightness = brightness / 4;
mc13892_bklit_set_dutycycle(LIT_MAIN, brightness);
devdata->intensity = brightness;
return 0;
}
static int mxcbl_get_intensity(struct backlight_device *bd)
{
struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
return devdata->intensity;
}
static int mxcbl_check_fb(struct backlight_device *bldev, struct fb_info *info)
{
char *id = info->fix.id;
if (!strcmp(id, "DISP3 BG"))
return 1;
else
return 0;
}
static struct backlight_ops bl_ops;
static int __init mxcbl_probe(struct platform_device *pdev)
{
int ret = 0;
struct backlight_device *bd;
struct mxcbl_dev_data *devdata;
struct backlight_properties props;
pmic_version_t pmic_version;
pr_debug("mc13892 backlight start probe\n");
devdata = kzalloc(sizeof(struct mxcbl_dev_data), GFP_KERNEL);
if (!devdata)
return -ENOMEM;
bl_ops.check_fb = mxcbl_check_fb;
bl_ops.get_brightness = mxcbl_get_intensity;
bl_ops.update_status = mxcbl_set_intensity;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = MXC_MAX_INTENSITY;
bd = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, devdata,
&bl_ops, &props);
if (IS_ERR(bd)) {
ret = PTR_ERR(bd);
goto err0;
}
platform_set_drvdata(pdev, bd);
/* according to LCD spec, current should be 18mA */
/* workaround for MC13892 TO1.1 crash issue, set current 6mA */
pmic_version = pmic_get_version();
if (pmic_version.revision < 20)
mc13892_bklit_set_current(LIT_MAIN, LIT_CURR_6);
else
mc13892_bklit_set_current(LIT_MAIN, LIT_CURR_18);
bd->props.brightness = MXC_DEFAULT_INTENSITY;
bd->props.power = FB_BLANK_UNBLANK;
bd->props.fb_blank = FB_BLANK_UNBLANK;
backlight_update_status(bd);
pr_debug("mc13892 backlight probed successfully\n");
return 0;
err0:
kfree(devdata);
return ret;
}
static int mxcbl_remove(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
kfree(devdata);
backlight_device_unregister(bd);
return 0;
}
static int mxcbl_suspend(struct platform_device *pdev, pm_message_t state)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
devdata->suspend = 1;
backlight_update_status(bd);
return 0;
}
static int mxcbl_resume(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
struct mxcbl_dev_data *devdata = dev_get_drvdata(&bd->dev);
devdata->suspend = 0;
backlight_update_status(bd);
return 0;
}
static struct platform_driver mxcbl_driver = {
.probe = mxcbl_probe,
.remove = mxcbl_remove,
.suspend = mxcbl_suspend,
.resume = mxcbl_resume,
.driver = {
.name = "mxc_mc13892_bl",
},
};
static int __init mxcbl_init(void)
{
return platform_driver_register(&mxcbl_driver);
}
static void __exit mxcbl_exit(void)
{
platform_driver_unregister(&mxcbl_driver);
}
module_init(mxcbl_init);
module_exit(mxcbl_exit);
MODULE_DESCRIPTION("Freescale MXC/i.MX PMIC Backlight Driver");
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_LICENSE("GPL");
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