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/*
* LED driver for SPFCW043 - leds-spfcw043.c
*
* Copyright (C) 2011 DongHyun Chang <dh348.chang@samsung.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/leds-spfcw043.h>
int *spfcw043_ctrl;
struct spfcw043_led_platform_data *led_pdata;
extern struct class *camera_class;
extern struct device *camera_rear;
static int spfcw043_setPower(int onoff, int level)
{
int i;
if (led_pdata->status == STATUS_AVAILABLE) {
led_pdata->torch_en(0);
led_pdata->torch_set(0);
/* onoff = 0 - select spfcw043, onoff = 1 - select ISP*/
udelay(10);
if (onoff) {
led_pdata->torch_set(1);
for (i = 1; i < level; i++) {
udelay(1);
led_pdata->torch_set(0);
udelay(1);
led_pdata->torch_set(1);
}
}
} else {
LED_ERROR("GPIO is not available!");
return -ENODEV;
}
return 0;
}
static int spfcw043_freeGpio(void)
{
if (led_pdata->status == STATUS_AVAILABLE) {
if (led_pdata->freeGpio()) {
LED_ERROR("Can't free GPIO for led\n");
return -ENODEV;
}
led_pdata->status = STATUS_UNAVAILABLE;
} else {
LED_ERROR("GPIO already free!");
}
return 0;
}
static int spfcw043_setGpio(void)
{
if (led_pdata->status != STATUS_AVAILABLE) {
if (led_pdata->setGpio()) {
LED_ERROR("Can't set GPIO for led\n");
return -ENODEV;
}
led_pdata->status = STATUS_AVAILABLE;
} else {
LED_ERROR("GPIO already set!");
}
return 0;
}
static int spfcw043_open(struct inode *inode, struct file *file)
{
int ret;
led_pdata->brightness = TORCH_BRIGHTNESS_50; /*normal setting*/
led_pdata->status = STATUS_INVALID;
ret = spfcw043_setGpio();
file->private_data = (int *) spfcw043_ctrl;
return ret;
}
static int spfcw043_release(struct inode *inode, struct file *file)
{
if (spfcw043_freeGpio()) {
LED_ERROR("spfcw043_freeGpio failed!\n");
return -ENODEV;
}
return 0;
}
static ssize_t spfcw043_power(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
int brightness = 0;
if (buf[0] < 0x30 || buf[0] > 0x39) {
LED_ERROR("data is wrong!");
return count;
} else if (buf[1] < 0x30 || buf[1] > 0x39)
brightness = (int) (buf[0] - 0x30);
else {
brightness = brightness + (int) (buf[0] - 0x30) * 10;
brightness = brightness + (int) (buf[1] - 0x30);
}
if (brightness < 0 || brightness >= TORCH_BRIGHTNESS_INVALID) {
LED_ERROR("brightness data is wrong! %d", brightness);
return count;
}
if (brightness == 0) {
spfcw043_setPower(0, 0);
} else {
if (spfcw043_setGpio()) {
LED_ERROR("spfcw043_setGpio failed!\n");
return count;
}
spfcw043_setPower(1, brightness);
}
return count;
}
static DEVICE_ATTR(rear_flash, S_IWUSR|S_IWGRP|S_IROTH, NULL, spfcw043_power);
static const struct file_operations spfcw043_fops = {
.owner = THIS_MODULE,
.open = spfcw043_open,
.release = spfcw043_release,
};
static struct miscdevice spfcw043_miscdev = {
.minor = 255,
.name = "spfcw043_led",
.fops = &spfcw043_fops,
};
static int spfcw043_led_probe(struct platform_device *pdev)
{
LED_ERROR("Probe\n");
led_pdata =
(struct spfcw043_led_platform_data *) pdev->dev.platform_data;
if (misc_register(&spfcw043_miscdev)) {
LED_ERROR("Failed to register misc driver\n");
return -ENODEV;
}
if (IS_ERR(camera_rear))
LED_ERROR("Failed to create device(flash)!\n");
if (device_create_file(camera_rear, &dev_attr_rear_flash) < 0) {
LED_ERROR("failed to create device file, %s\n",
dev_attr_rear_flash.attr.name);
}
spfcw043_setGpio();
return 0;
}
static int __devexit spfcw043_led_remove(struct platform_device *pdev)
{
led_pdata->freeGpio();
misc_deregister(&spfcw043_miscdev);
device_remove_file(camera_rear, &dev_attr_rear_flash);
device_destroy(camera_class, 0);
class_destroy(camera_class);
return 0;
}
static struct platform_driver spfcw043_led_driver = {
.probe = spfcw043_led_probe,
.remove = __devexit_p(spfcw043_led_remove),
.driver = {
.name = "spfcw043-led",
.owner = THIS_MODULE,
},
};
static int __init spfcw043_led_init(void)
{
return platform_driver_register(&spfcw043_led_driver);
}
static void __exit spfcw043_led_exit(void)
{
platform_driver_unregister(&spfcw043_led_driver);
}
module_init(spfcw043_led_init);
module_exit(spfcw043_led_exit);
MODULE_AUTHOR("DongHyun Chang <dh348.chang@samsung.com.com>");
MODULE_DESCRIPTION("SPFCW043 LED driver");
MODULE_LICENSE("GPL");
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