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/*
* LED driver for the vibrator of the Openmoko GTA01/GTA02 GSM Phones
*
* (C) 2006-2008 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.
*
* Javi Roman <javiroman@kernel-labs.org>:
* Implement PWM support for GTA01Bv4 and later
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <plat/pwm.h>
#include <mach/regs-gpio.h>
#include <plat/regs-timer.h>
#include <linux/gta02-vibrator.h>
#define COUNTER 64
static struct gta02_vib_priv {
struct led_classdev cdev;
unsigned int gpio;
spinlock_t lock;
unsigned int has_pwm;
struct s3c2410_pwm pwm;
unsigned long vib_gpio_pin; /* which pin to meddle with */
u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
u8 vib_pwm_latched;
u32 fiq_count;
struct gta02_vib_platform_data *pdata;
} gta02_vib_priv;
int gta02_vibrator_fiq_handler(void)
{
gta02_vib_priv.fiq_count++;
if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
/* idle */
return 0;
if ((u8)gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 0);
if ((u8)gta02_vib_priv.fiq_count)
return 1;
gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
if (gta02_vib_priv.vib_pwm_latched)
s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 1);
return 1;
}
static void gta02_vib_vib_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
gta02_vib_priv.vib_pwm = value; /* set it for FIQ */
gta02_vib_priv.pdata->kick_fiq(); /* start up FIQs if not already going */
}
static struct gta02_vib_priv gta02_vib_led = {
.cdev = {
.name = "gta02:vibrator",
.brightness_set = gta02_vib_vib_set,
},
};
static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
{
int rc;
rc = s3c2410_pwm_init(&vp->pwm);
if (rc)
return rc;
vp->pwm.timerid = PWM3;
/* use same prescaler as arch/arm/plat-s3c24xx/time.c */
vp->pwm.prescaler = (6 - 1) / 2;
vp->pwm.divider = S3C2410_TCFG1_MUX3_DIV2;
vp->pwm.counter = COUNTER;
vp->pwm.comparer = COUNTER;
rc = s3c2410_pwm_enable(&vp->pwm);
if (rc)
return rc;
s3c2410_pwm_start(&vp->pwm);
return 0;
}
#ifdef CONFIG_PM
static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
{
led_classdev_suspend(>a02_vib_led.cdev);
if (gta02_vib_priv.pdata)
gta02_vib_priv.pdata->disable_fiq();
return 0;
}
static int gta02_vib_resume(struct platform_device *dev)
{
struct gta02_vib_priv *vp = platform_get_drvdata(dev);
if (vp->has_pwm)
gta02_vib_init_hw(vp);
led_classdev_resume(>a02_vib_led.cdev);
if (gta02_vib_priv.pdata)
gta02_vib_priv.pdata->enable_fiq();
return 0;
}
#endif /* CONFIG_PM */
static int __init gta02_vib_probe(struct platform_device *pdev)
{
struct resource *r;
r = platform_get_resource(pdev, 0, 0);
if (!r || !r->start)
return -EIO;
gta02_vib_led.gpio = r->start;
gta02_vib_priv.pdata = pdev->dev.platform_data;
platform_set_drvdata(pdev, >a02_vib_led);
s3c2410_gpio_setpin(gta02_vib_led.gpio, 0); /* off */
s3c2410_gpio_cfgpin(gta02_vib_led.gpio, S3C2410_GPIO_OUTPUT);
/* safe, kmalloc'd copy needed for FIQ ISR */
gta02_vib_priv.vib_gpio_pin = gta02_vib_led.gpio;
gta02_vib_priv.vib_pwm = 0; /* off */
spin_lock_init(>a02_vib_led.lock);
return led_classdev_register(&pdev->dev, >a02_vib_led.cdev);
}
static int gta02_vib_remove(struct platform_device *pdev)
{
gta02_vib_priv.vib_pwm = 0; /* off */
/* would only need kick if already off so no kick needed */
if (gta02_vib_led.has_pwm)
s3c2410_pwm_disable(>a02_vib_led.pwm);
led_classdev_unregister(>a02_vib_led.cdev);
return 0;
}
static struct platform_driver gta02_vib_driver = {
.probe = gta02_vib_probe,
.remove = gta02_vib_remove,
#ifdef CONFIG_PM
.suspend = gta02_vib_suspend,
.resume = gta02_vib_resume,
#endif
.driver = {
.name = "gta02-vibrator",
},
};
static int __init gta02_vib_init(void)
{
return platform_driver_register(>a02_vib_driver);
}
static void __exit gta02_vib_exit(void)
{
platform_driver_unregister(>a02_vib_driver);
}
module_init(gta02_vib_init);
module_exit(gta02_vib_exit);
MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
MODULE_LICENSE("GPL");
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