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/*
* drivers/video/backlight/ubicom32lcdpowerpower.c
* LCD power driver for the Ubicom32 platform
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/lcd.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <asm/ubicom32lcdpower.h>
#include <asm/ip5000.h>
#define DRIVER_NAME "ubicom32lcdpower"
struct ubicom32lcdpower_data {
/*
* Pointer to the platform data structure. Keep this around since we need values
* from it to set the backlight intensity.
*/
const struct ubicom32lcdpower_platform_data *pdata;
/*
* LCD device, we have to save this for use when we remove ourselves.
*/
struct lcd_device *lcddev;
};
/*
* ubicom32lcdpower_set_power
*/
static int ubicom32lcdpower_set_power(struct lcd_device *ld, int power)
{
struct ubicom32lcdpower_data *ud = (struct ubicom32lcdpower_data *)lcd_get_data(ld);
if (power == FB_BLANK_UNBLANK) {
gpio_direction_output(ud->pdata->vgh_gpio, ud->pdata->vgh_polarity);
return 0;
}
gpio_direction_output(ud->pdata->vgh_gpio, !ud->pdata->vgh_polarity);
return 0;
}
/*
* ubicom32lcdpower_get_power
*/
static int ubicom32lcdpower_get_power(struct lcd_device *ld)
{
struct ubicom32lcdpower_data *ud = (struct ubicom32lcdpower_data *)lcd_get_data(ld);
int vgh = gpio_get_value(ud->pdata->vgh_gpio);
if ((vgh && ud->pdata->vgh_polarity) || (!vgh && !ud->pdata->vgh_polarity)) {
return 1;
}
return 0;
}
static struct lcd_ops ubicom32lcdpower_ops = {
.get_power = ubicom32lcdpower_get_power,
.set_power = ubicom32lcdpower_set_power,
};
/*
* ubicom32lcdpower_probe
*/
static int ubicom32lcdpower_probe(struct platform_device *pdev)
{
const struct ubicom32lcdpower_platform_data *pdata = pdev->dev.platform_data;
struct ubicom32lcdpower_data *ud;
struct lcd_device *lcddev;
int retval;
/*
* Check to see if we have any platform data, if we don't have a LCD to control
*/
if (!pdata) {
return -ENODEV;
}
/*
* Allocate our private data
*/
ud = kzalloc(sizeof(struct ubicom32lcdpower_data), GFP_KERNEL);
if (!ud) {
return -ENOMEM;
}
ud->pdata = pdata;
/*
* Request our GPIOs
*/
retval = gpio_request(pdata->vgh_gpio, "vgh");
if (retval) {
dev_err(&pdev->dev, "Failed to allocate vgh GPIO\n");
goto fail_gpio;
}
/*
* Register our lcd device
*/
lcddev = lcd_device_register(DRIVER_NAME, &pdev->dev, ud, &ubicom32lcdpower_ops);
if (IS_ERR(lcddev)) {
retval = PTR_ERR(lcddev);
goto fail;
}
ud->lcddev = lcddev;
platform_set_drvdata(pdev, ud);
ubicom32lcdpower_set_power(lcddev, FB_BLANK_UNBLANK);
printk(KERN_INFO DRIVER_NAME ": LCD driver started\n");
return 0;
fail:
gpio_free(pdata->vgh_gpio);
fail_gpio:
platform_set_drvdata(pdev, NULL);
kfree(ud);
return retval;
}
/*
* ubicom32lcdpower_remove
*/
static int __exit ubicom32lcdpower_remove(struct platform_device *pdev)
{
struct ubicom32lcdpower_data *ud = platform_get_drvdata(pdev);
lcd_device_unregister(ud->lcddev);
platform_set_drvdata(pdev, NULL);
kfree(ud);
return 0;
}
static struct platform_driver ubicom32lcdpower_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.remove = __exit_p(ubicom32lcdpower_remove),
};
/*
* ubicom32lcdpower_init
*/
static int __init ubicom32lcdpower_init(void)
{
return platform_driver_probe(&ubicom32lcdpower_driver, ubicom32lcdpower_probe);
}
module_init(ubicom32lcdpower_init);
/*
* ubicom32lcdpower_exit
*/
static void __exit ubicom32lcdpower_exit(void)
{
platform_driver_unregister(&ubicom32lcdpower_driver);
}
module_exit(ubicom32lcdpower_exit);
MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
MODULE_DESCRIPTION("Ubicom32 lcd power driver");
MODULE_LICENSE("GPL");
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