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