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/*
* Backlight driver for DCDC2 on i.MX32ADS board
*
* Copyright(C) 2007 Wolfson Microelectronics PLC.
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/regulator/consumer.h>
#include <linux/mfd/wm8350/pmic.h>
#include <linux/mfd/wm8350/bl.h>
struct wm8350_backlight {
struct backlight_properties props;
struct backlight_device *device;
struct regulator *dcdc;
struct regulator *isink;
struct notifier_block notifier;
struct work_struct work;
struct mutex mutex;
int intensity;
int suspend;
int retries;
};
/* hundredths of uA, 405 = 4.05 uA */
static const int intensity_huA[] = {
405, 482, 573, 681, 810, 963, 1146, 1362, 1620, 1927, 2291, 2725,
3240, 3853, 4582, 5449, 6480, 7706, 9164, 10898, 12960, 15412, 18328,
21796, 25920, 30824, 36656, 43592, 51840, 61648, 73313, 87184,
103680, 123297, 146626, 174368, 207360, 246594, 293251, 348737,
414720, 493188, 586503, 697473, 829440, 986376, 1173005, 1394946,
1658880, 1972752, 2346011, 2789892, 3317760, 3945504, 4692021,
5579785, 6635520, 7891008, 9384042, 11159570, 13271040, 15782015,
18768085, 22319140,
};
static void bl_work(struct work_struct *work)
{
struct wm8350_backlight *bl =
container_of(work, struct wm8350_backlight, work);
struct regulator *isink = bl->isink;
mutex_lock(&bl->mutex);
if (bl->intensity >= 0 &&
bl->intensity < ARRAY_SIZE(intensity_huA)) {
bl->retries = 0;
regulator_set_current_limit(isink,
0, intensity_huA[bl->intensity] / 100);
} else
printk(KERN_ERR "wm8350: Backlight intensity error\n");
mutex_unlock(&bl->mutex);
}
static int wm8350_bl_notifier(struct notifier_block *self,
unsigned long event, void *data)
{
struct wm8350_backlight *bl =
container_of(self, struct wm8350_backlight, notifier);
struct regulator *isink = bl->isink;
if (event & REGULATOR_EVENT_UNDER_VOLTAGE)
printk(KERN_ERR "wm8350: BL DCDC undervoltage\n");
if (event & REGULATOR_EVENT_REGULATION_OUT)
printk(KERN_ERR "wm8350: BL ISINK out of regulation\n");
mutex_lock(&bl->mutex);
if (bl->retries) {
bl->retries--;
regulator_disable(isink);
regulator_set_current_limit(isink, 0, bl->intensity);
regulator_enable(isink);
} else {
printk(KERN_ERR
"wm8350: BL regulation retry failure - disable\n");
bl->intensity = 0;
regulator_disable(isink);
}
mutex_unlock(&bl->mutex);
return 0;
}
static int wm8350_bl_send_intensity(struct backlight_device *bd)
{
struct wm8350_backlight *bl =
(struct wm8350_backlight *)dev_get_drvdata(&bd->dev);
int intensity = bd->props.brightness;
if (bd->props.power != FB_BLANK_UNBLANK)
intensity = 0;
if (bd->props.fb_blank != FB_BLANK_UNBLANK)
intensity = 0;
if (bl->suspend)
intensity = 0;
mutex_lock(&bl->mutex);
bl->intensity = intensity;
mutex_unlock(&bl->mutex);
schedule_work(&bl->work);
return 0;
}
#ifdef CONFIG_PM
static int wm8350_bl_suspend(struct platform_device *pdev, pm_message_t state)
{
struct wm8350_backlight *bl =
(struct wm8350_backlight *)platform_get_drvdata(pdev);
bl->suspend = 1;
backlight_update_status(bl->device);
return 0;
}
static int wm8350_bl_resume(struct platform_device *pdev)
{
struct wm8350_backlight *bl =
(struct wm8350_backlight *)platform_get_drvdata(pdev);
bl->suspend = 0;
backlight_update_status(bl->device);
return 0;
}
#else
#define wm8350_bl_suspend NULL
#define wm8350_bl_resume NULL
#endif
static int wm8350_bl_get_intensity(struct backlight_device *bd)
{
struct wm8350_backlight *bl =
(struct wm8350_backlight *)dev_get_drvdata(&bd->dev);
return bl->intensity;
}
static struct backlight_ops wm8350_bl_ops = {
.get_brightness = wm8350_bl_get_intensity,
.update_status = wm8350_bl_send_intensity,
};
static int wm8350_bl_probe(struct platform_device *pdev)
{
struct regulator *isink, *dcdc;
struct wm8350_backlight *bl;
struct wm8350_bl_platform_data *pdata = pdev->dev.platform_data;
struct wm8350 *pmic;
int ret;
if (pdata == NULL) {
printk(KERN_ERR "%s: no platform data\n", __func__);
return -ENODEV;
}
if (pdata->isink != WM8350_ISINK_A && pdata->isink != WM8350_ISINK_B) {
printk(KERN_ERR "%s: invalid ISINK\n", __func__);
return -EINVAL;
}
if (pdata->dcdc != WM8350_DCDC_2 && pdata->dcdc != WM8350_DCDC_5) {
printk(KERN_ERR "%s: invalid DCDC\n", __func__);
return -EINVAL;
}
printk(KERN_INFO "wm8350: backlight using %s and %s\n",
pdata->isink == WM8350_ISINK_A ? "ISINKA" : "ISINKB",
pdata->dcdc == WM8350_DCDC_2 ? "DCDC2" : "DCDC5");
isink = regulator_get(&pdev->dev,
pdata->isink == WM8350_ISINK_A ? "ISINKA" : "ISINKB");
if (IS_ERR(isink) || isink == NULL) {
printk(KERN_ERR "%s: cant get ISINK\n", __func__);
return PTR_ERR(isink);
}
dcdc = regulator_get(&pdev->dev,
pdata->dcdc == WM8350_DCDC_2 ? "DCDC2" : "DCDC5");
if (IS_ERR(dcdc) || dcdc == NULL) {
printk(KERN_ERR "%s: cant get DCDC\n", __func__);
regulator_put(isink);
return PTR_ERR(dcdc);
}
bl = kzalloc(sizeof(*bl), GFP_KERNEL);
if (bl == NULL) {
regulator_put(isink);
regulator_put(dcdc);
return -ENOMEM;
}
mutex_init(&bl->mutex);
INIT_WORK(&bl->work, bl_work);
bl->props.max_brightness = pdata->max_brightness;
bl->props.power = pdata->power;
bl->props.brightness = pdata->brightness;
bl->retries = pdata->retries;
bl->dcdc = dcdc;
bl->isink = isink;
platform_set_drvdata(pdev, bl);
pmic = regulator_get_drvdata(bl->isink);
wm8350_bl_ops.check_fb = pdata->check_fb;
bl->device = backlight_device_register(dev_name(&pdev->dev), &pdev->dev,
bl, &wm8350_bl_ops);
if (IS_ERR(bl->device)) {
ret = PTR_ERR(bl->device);
regulator_put(dcdc);
regulator_put(isink);
kfree(bl);
return ret;
}
bl->notifier.notifier_call = wm8350_bl_notifier;
regulator_register_notifier(dcdc, &bl->notifier);
regulator_register_notifier(isink, &bl->notifier);
bl->device->props = bl->props;
regulator_set_current_limit(isink, 0, 20000);
wm8350_isink_set_flash(pmic, pdata->isink,
WM8350_ISINK_FLASH_DISABLE,
WM8350_ISINK_FLASH_TRIG_BIT,
WM8350_ISINK_FLASH_DUR_32MS,
WM8350_ISINK_FLASH_ON_1_00S,
WM8350_ISINK_FLASH_OFF_1_00S,
WM8350_ISINK_FLASH_MODE_EN);
wm8350_dcdc25_set_mode(pmic, pdata->dcdc,
WM8350_ISINK_MODE_BOOST, WM8350_ISINK_ILIM_NORMAL,
pdata->voltage_ramp, pdata->isink == WM8350_ISINK_A ?
WM8350_DC5_FBSRC_ISINKA : WM8350_DC5_FBSRC_ISINKB);
wm8350_dcdc_set_slot(pmic, pdata->dcdc, 15, 0,
pdata->dcdc == WM8350_DCDC_2 ?
WM8350_DC2_ERRACT_SHUTDOWN_CONV : WM8350_DC5_ERRACT_NONE);
regulator_enable(isink);
backlight_update_status(bl->device);
return 0;
}
static int wm8350_bl_remove(struct platform_device *pdev)
{
struct wm8350_backlight *bl =
(struct wm8350_backlight *)platform_get_drvdata(pdev);
struct regulator *isink = bl->isink, *dcdc = bl->dcdc;
bl->intensity = 0;
backlight_update_status(bl->device);
schedule_work(&bl->work);
flush_scheduled_work();
backlight_device_unregister(bl->device);
regulator_set_current_limit(isink, 0, 0);
regulator_disable(isink);
regulator_unregister_notifier(isink, &bl->notifier);
regulator_unregister_notifier(dcdc, &bl->notifier);
regulator_put(isink);
regulator_put(dcdc);
return 0;
}
struct platform_driver imx32ads_backlight_driver = {
.driver = {
.name = "wm8350-bl",
.owner = THIS_MODULE,
},
.probe = wm8350_bl_probe,
.remove = wm8350_bl_remove,
.suspend = wm8350_bl_suspend,
.resume = wm8350_bl_resume,
};
static int __devinit imx32ads_backlight_init(void)
{
return platform_driver_register(&imx32ads_backlight_driver);
}
static void imx32ads_backlight_exit(void)
{
platform_driver_unregister(&imx32ads_backlight_driver);
}
device_initcall_sync(imx32ads_backlight_init);
module_exit(imx32ads_backlight_exit);
MODULE_AUTHOR("Liam Girdwood <lg@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM8350 Backlight driver");
MODULE_LICENSE("GPL");
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