target/linux/s3c24xx/files-2.6.30/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 <plat/regs-timer.h>
  25 #include <linux/gta02-vibrator.h>
  26
  27 #define COUNTER 64
  28
  29 static struct gta02_vib_priv {
  30         struct led_classdev cdev;
  31         unsigned int gpio;
  32         spinlock_t lock;
  33         unsigned int has_pwm;
  34         struct s3c2410_pwm pwm;
  35
  36         unsigned long vib_gpio_pin; /* which pin to meddle with */
  37         u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
  38         u8 vib_pwm_latched;
  39         u32 fiq_count;
  40
  41         struct gta02_vib_platform_data *pdata;
  42 } gta02_vib_priv;
  43
  44 int gta02_vibrator_fiq_handler(void)
  45 {
  46         gta02_vib_priv.fiq_count++;
  47
  48         if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
  49                 /* idle */
  50                 return 0;
  51
  52         if ((u8)gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
  53                 s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 0);
  54
  55         if ((u8)gta02_vib_priv.fiq_count)
  56                 return 1;
  57
  58         gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
  59         if (gta02_vib_priv.vib_pwm_latched)
  60                 s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 1);
  61
  62         return 1;
  63 }
  64
  65 static void gta02_vib_vib_set(struct led_classdev *led_cdev,
  66                                 enum led_brightness value)
  67 {
  68     gta02_vib_priv.vib_pwm = value; /* set it for FIQ */
  69     gta02_vib_priv.pdata->kick_fiq(); /* start up FIQs if not already going */
  70 }
  71
  72 static struct gta02_vib_priv gta02_vib_led = {
  73         .cdev = {
  74                 .name = "gta02:vibrator",
  75                 .brightness_set = gta02_vib_vib_set,
  76         },
  77 };
  78
  79 static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
  80 {
  81         int rc;
  82
  83         rc = s3c2410_pwm_init(&vp->pwm);
  84         if (rc)
  85                 return rc;
  86
  87         vp->pwm.timerid = PWM3;
  88         /* use same prescaler as arch/arm/plat-s3c24xx/time.c */
  89         vp->pwm.prescaler = (6 - 1) / 2;
  90         vp->pwm.divider = S3C2410_TCFG1_MUX3_DIV2;
  91         vp->pwm.counter = COUNTER;
  92         vp->pwm.comparer = COUNTER;
  93
  94         rc = s3c2410_pwm_enable(&vp->pwm);
  95         if (rc)
  96                 return rc;
  97
  98         s3c2410_pwm_start(&vp->pwm);
  99
 100         return 0;
 101 }
 102
 103 #ifdef CONFIG_PM
 104 static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
 105 {
 106         led_classdev_suspend(&gta02_vib_led.cdev);
 107         if (gta02_vib_priv.pdata)
 108                 gta02_vib_priv.pdata->disable_fiq();
 109         return 0;
 110 }
 111
 112 static int gta02_vib_resume(struct platform_device *dev)
 113 {
 114         struct gta02_vib_priv *vp = platform_get_drvdata(dev);
 115
 116         if (vp->has_pwm)
 117                 gta02_vib_init_hw(vp);
 118
 119         led_classdev_resume(&gta02_vib_led.cdev);
 120         if (gta02_vib_priv.pdata)
 121                 gta02_vib_priv.pdata->enable_fiq();
 122
 123         return 0;
 124 }
 125 #endif /* CONFIG_PM */
 126
 127 static int __init gta02_vib_probe(struct platform_device *pdev)
 128 {
 129         struct resource *r;
 130
 131         r = platform_get_resource(pdev, 0, 0);
 132         if (!r || !r->start)
 133                 return -EIO;
 134
 135         gta02_vib_led.gpio = r->start;
 136
 137         gta02_vib_priv.pdata = pdev->dev.platform_data;
 138         platform_set_drvdata(pdev, &gta02_vib_led);
 139
 140     s3c2410_gpio_setpin(gta02_vib_led.gpio, 0); /* off */
 141     s3c2410_gpio_cfgpin(gta02_vib_led.gpio, S3C2410_GPIO_OUTPUT);
 142     /* safe, kmalloc'd copy needed for FIQ ISR */
 143     gta02_vib_priv.vib_gpio_pin = gta02_vib_led.gpio;
 144     gta02_vib_priv.vib_pwm = 0; /* off */
 145         spin_lock_init(&gta02_vib_led.lock);
 146
 147         return led_classdev_register(&pdev->dev, &gta02_vib_led.cdev);
 148 }
 149
 150 static int gta02_vib_remove(struct platform_device *pdev)
 151 {
 152     gta02_vib_priv.vib_pwm = 0; /* off */
 153         /* would only need kick if already off so no kick needed */
 154
 155         if (gta02_vib_led.has_pwm)
 156                 s3c2410_pwm_disable(&gta02_vib_led.pwm);
 157
 158         led_classdev_unregister(&gta02_vib_led.cdev);
 159
 160         return 0;
 161 }
 162
 163 static struct platform_driver gta02_vib_driver = {
 164         .probe          = gta02_vib_probe,
 165         .remove         = gta02_vib_remove,
 166 #ifdef CONFIG_PM
 167         .suspend        = gta02_vib_suspend,
 168         .resume         = gta02_vib_resume,
 169 #endif
 170         .driver         = {
 171                 .name           = "gta02-vibrator",
 172         },
 173 };
 174
 175 static int __init gta02_vib_init(void)
 176 {
 177         return platform_driver_register(&gta02_vib_driver);
 178 }
 179
 180 static void __exit gta02_vib_exit(void)
 181 {
 182         platform_driver_unregister(&gta02_vib_driver);
 183 }
 184
 185 module_init(gta02_vib_init);
 186 module_exit(gta02_vib_exit);
 187
 188 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 189 MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
 190 MODULE_LICENSE("GPL");