target/linux/s3c24xx/files-2.6.31/drivers/leds/leds-gta02-vibrator.c

   1 /*
   2  * LED driver for the vibrator of the Openmoko GTA01/GTA02 GSM Phones
   3  *
   4  * (C) 2006-2008 by Openmoko, Inc.
   5  * Author: Harald Welte <laforge@openmoko.org>
   6  * All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Javi Roman <javiroman@kernel-labs.org>:
  13  *      Implement PWM support for GTA01Bv4 and later
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/leds.h>
  20 #include <mach/hardware.h>
  21 #include <asm/mach-types.h>
  22 #include <plat/pwm.h>
  23 #include <mach/regs-gpio.h>
  24 #include <mach/gpio-fns.h>
  25 #include <plat/regs-timer.h>
  26 #include <linux/gta02-vibrator.h>
  27
  28 #define COUNTER 64
  29
  30 static struct gta02_vib_priv {
  31         struct led_classdev cdev;
  32         unsigned int gpio;
  33         spinlock_t lock;
  34         unsigned int has_pwm;
  35         struct s3c2410_pwm pwm;
  36
  37         unsigned long vib_gpio_pin; /* which pin to meddle with */
  38         u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
  39         u8 vib_pwm_latched;
  40         u32 fiq_count;
  41
  42         struct gta02_vib_platform_data *pdata;
  43 } gta02_vib_priv;
  44
  45 int gta02_vibrator_fiq_handler(void)
  46 {
  47         gta02_vib_priv.fiq_count++;
  48
  49         if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
  50                 /* idle */
  51                 return 0;
  52
  53         if ((u8)gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
  54                 s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 0);
  55
  56         if ((u8)gta02_vib_priv.fiq_count)
  57                 return 1;
  58
  59         gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
  60         if (gta02_vib_priv.vib_pwm_latched)
  61                 s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 1);
  62
  63         return 1;
  64 }
  65
  66 static void gta02_vib_vib_set(struct led_classdev *led_cdev,
  67                                 enum led_brightness value)
  68 {
  69     gta02_vib_priv.vib_pwm = value; /* set it for FIQ */
  70     gta02_vib_priv.pdata->kick_fiq(); /* start up FIQs if not already going */
  71 }
  72
  73 static struct gta02_vib_priv gta02_vib_led = {
  74         .cdev = {
  75                 .name = "gta02:vibrator",
  76                 .brightness_set = gta02_vib_vib_set,
  77         },
  78 };
  79
  80 static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
  81 {
  82         int rc;
  83
  84         rc = s3c2410_pwm_init(&vp->pwm);
  85         if (rc)
  86                 return rc;
  87
  88         vp->pwm.timerid = PWM3;
  89         /* use same prescaler as arch/arm/plat-s3c24xx/time.c */
  90         vp->pwm.prescaler = (6 - 1) / 2;
  91         vp->pwm.divider = S3C2410_TCFG1_MUX3_DIV2;
  92         vp->pwm.counter = COUNTER;
  93         vp->pwm.comparer = COUNTER;
  94
  95         rc = s3c2410_pwm_enable(&vp->pwm);
  96         if (rc)
  97                 return rc;
  98
  99         s3c2410_pwm_start(&vp->pwm);
 100
 101         return 0;
 102 }
 103
 104 #ifdef CONFIG_PM
 105 static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
 106 {
 107         led_classdev_suspend(&gta02_vib_led.cdev);
 108         if (gta02_vib_priv.pdata)
 109                 gta02_vib_priv.pdata->disable_fiq();
 110         return 0;
 111 }
 112
 113 static int gta02_vib_resume(struct platform_device *dev)
 114 {
 115         struct gta02_vib_priv *vp = platform_get_drvdata(dev);
 116
 117         if (vp->has_pwm)
 118                 gta02_vib_init_hw(vp);
 119
 120         led_classdev_resume(&gta02_vib_led.cdev);
 121         if (gta02_vib_priv.pdata)
 122                 gta02_vib_priv.pdata->enable_fiq();
 123
 124         return 0;
 125 }
 126 #endif /* CONFIG_PM */
 127
 128 static int __init gta02_vib_probe(struct platform_device *pdev)
 129 {
 130         struct resource *r;
 131
 132         r = platform_get_resource(pdev, 0, 0);
 133         if (!r || !r->start)
 134                 return -EIO;
 135
 136         gta02_vib_led.gpio = r->start;
 137
 138         gta02_vib_priv.pdata = pdev->dev.platform_data;
 139         platform_set_drvdata(pdev, &gta02_vib_led);
 140
 141     s3c2410_gpio_setpin(gta02_vib_led.gpio, 0); /* off */
 142     s3c2410_gpio_cfgpin(gta02_vib_led.gpio, S3C2410_GPIO_OUTPUT);
 143     /* safe, kmalloc'd copy needed for FIQ ISR */
 144     gta02_vib_priv.vib_gpio_pin = gta02_vib_led.gpio;
 145     gta02_vib_priv.vib_pwm = 0; /* off */
 146         spin_lock_init(&gta02_vib_led.lock);
 147
 148         return led_classdev_register(&pdev->dev, &gta02_vib_led.cdev);
 149 }
 150
 151 static int gta02_vib_remove(struct platform_device *pdev)
 152 {
 153     gta02_vib_priv.vib_pwm = 0; /* off */
 154         /* would only need kick if already off so no kick needed */
 155
 156         if (gta02_vib_led.has_pwm)
 157                 s3c2410_pwm_disable(&gta02_vib_led.pwm);
 158
 159         led_classdev_unregister(&gta02_vib_led.cdev);
 160
 161         return 0;
 162 }
 163
 164 static struct platform_driver gta02_vib_driver = {
 165         .probe          = gta02_vib_probe,
 166         .remove         = gta02_vib_remove,
 167 #ifdef CONFIG_PM
 168         .suspend        = gta02_vib_suspend,
 169         .resume         = gta02_vib_resume,
 170 #endif
 171         .driver         = {
 172                 .name           = "gta02-vibrator",
 173         },
 174 };
 175
 176 static int __init gta02_vib_init(void)
 177 {
 178         return platform_driver_register(&gta02_vib_driver);
 179 }
 180
 181 static void __exit gta02_vib_exit(void)
 182 {
 183         platform_driver_unregister(&gta02_vib_driver);
 184 }
 185
 186 module_init(gta02_vib_init);
 187 module_exit(gta02_vib_exit);
 188
 189 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 190 MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
 191 MODULE_LICENSE("GPL");