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/*
* LED driver for the FIC Neo1973 GTA02 GSM phone
*
* (C) 2006-2007 by OpenMoko, Inc.
* Author: Harald Welte <laforge@openmoko.org>
* All rights reserved.
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/arch/pwm.h>
#include <asm/arch/gta02.h>
#include <asm/plat-s3c/regs-timer.h>
#define MAX_LEDS 3
#define COUNTER 256
struct gta02_led_priv
{
struct mutex mutex;
struct led_classdev cdev;
struct s3c2410_pwm pwm;
unsigned int gpio;
unsigned int has_pwm;
};
struct gta02_led_bundle
{
int num_leds;
struct gta02_led_priv led[MAX_LEDS];
};
static inline struct gta02_led_priv *to_priv(struct led_classdev *led_cdev)
{
return container_of(led_cdev, struct gta02_led_priv, cdev);
}
static inline struct gta02_led_bundle *to_bundle(struct led_classdev *led_cdev)
{
return dev_get_drvdata(led_cdev->dev);
}
static void gta02led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct gta02_led_priv *lp = to_priv(led_cdev);
/*
* value == 255 -> 99% duty cycle (full power)
* value == 128 -> 50% duty cycle (medium power)
* value == 0 -> 0% duty cycle (zero power)
*/
mutex_lock(&lp->mutex);
if (lp->has_pwm) {
s3c2410_pwm_duty_cycle(value, &lp->pwm);
} else {
if (value)
s3c2410_gpio_setpin(lp->gpio, 1);
else
s3c2410_gpio_setpin(lp->gpio, 0);
}
mutex_unlock(&lp->mutex);
}
#ifdef CONFIG_PM
static int gta02led_suspend(struct platform_device *pdev, pm_message_t state)
{
struct gta02_led_bundle *bundle = platform_get_drvdata(pdev);
int i;
for (i = 0; i < bundle->num_leds; i++)
led_classdev_suspend(&bundle->led[i].cdev);
return 0;
}
static int gta02led_resume(struct platform_device *pdev)
{
struct gta02_led_bundle *bundle = platform_get_drvdata(pdev);
int i;
for (i = 0; i < bundle->num_leds; i++)
led_classdev_resume(&bundle->led[i].cdev);
return 0;
}
#endif
static int __init gta02led_probe(struct platform_device *pdev)
{
int i, rc;
struct gta02_led_bundle *bundle;
if (!machine_is_neo1973_gta02())
return -EIO;
bundle = kzalloc(sizeof(struct gta02_led_bundle), GFP_KERNEL);
if (!bundle)
return -ENOMEM;
platform_set_drvdata(pdev, bundle);
for (i = 0; i < pdev->num_resources; i++) {
struct gta02_led_priv *lp;
struct resource *r;
if (i >= MAX_LEDS)
break;
r = platform_get_resource(pdev, 0, i);
if (!r || !r->start || !r->name)
continue;
lp = &bundle->led[i];
lp->gpio = r->start;
lp->cdev.name = r->name;
lp->cdev.brightness_set = gta02led_set;
switch (lp->gpio) {
case S3C2410_GPB0:
lp->has_pwm = 1;
lp->pwm.timerid = PWM0;
s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB0_TOUT0);
break;
case S3C2410_GPB1:
lp->has_pwm = 1;
lp->pwm.timerid = PWM1;
s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB1_TOUT1);
break;
case S3C2410_GPB2:
lp->has_pwm = 1;
lp->pwm.timerid = PWM2;
s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB2_TOUT2);
break;
case S3C2410_GPB3:
lp->has_pwm = 1;
lp->pwm.timerid = PWM3;
s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPB3_TOUT3);
break;
default:
break;
}
lp->pwm.prescaler = 0;
lp->pwm.divider = S3C2410_TCFG1_MUX3_DIV8;
lp->pwm.counter = COUNTER;
lp->pwm.comparer = COUNTER;
s3c2410_pwm_enable(&lp->pwm);
s3c2410_pwm_start(&lp->pwm);
switch (lp->gpio) {
case S3C2410_GPB0:
case S3C2410_GPB1:
case S3C2410_GPB2:
lp->has_pwm = 0;
s3c2410_gpio_cfgpin(lp->gpio, S3C2410_GPIO_OUTPUT);
s3c2410_gpio_setpin(lp->gpio, 0);
break;
default:
break;
}
mutex_init(&lp->mutex);
rc = led_classdev_register(&pdev->dev, &lp->cdev);
}
return 0;
}
static int gta02led_remove(struct platform_device *pdev)
{
struct gta02_led_bundle *bundle = platform_get_drvdata(pdev);
int i;
for (i = 0; i < bundle->num_leds; i++) {
struct gta02_led_priv *lp = &bundle->led[i];
if (lp->has_pwm)
s3c2410_pwm_disable(&lp->pwm);
led_classdev_unregister(&lp->cdev);
mutex_destroy(&lp->mutex);
}
platform_set_drvdata(pdev, NULL);
kfree(bundle);
return 0;
}
static struct platform_driver gta02led_driver = {
.probe = gta02led_probe,
.remove = gta02led_remove,
#ifdef CONFIG_PM
.suspend = gta02led_suspend,
.resume = gta02led_resume,
#endif
.driver = {
.name = "gta02-led",
},
};
static int __init gta02led_init(void)
{
return platform_driver_register(>a02led_driver);
}
static void __exit gta02led_exit(void)
{
platform_driver_unregister(>a02led_driver);
}
module_init(gta02led_init);
module_exit(gta02led_exit);
MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
MODULE_DESCRIPTION("FIC Neo1973 GTA02 LED driver");
MODULE_LICENSE("GPL");
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