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 #include <linux/gta02-shadow.h>
  28
  29 #define COUNTER 64
  30
  31 static struct gta02_vib_priv {
  32         struct led_classdev cdev;
  33         unsigned int gpio;
  34         spinlock_t lock;
  35         unsigned int has_pwm;
  36         struct s3c2410_pwm pwm;
  37
  38         unsigned long vib_gpio_pin; /* which pin to meddle with */
  39         u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
  40         u8 vib_pwm_latched;
  41         u32 fiq_count;
  42
  43         struct gta02_vib_platform_data *pdata;
  44 } gta02_vib_priv;
  45
  46 int gta02_vibrator_fiq_handler(void)
  47 {
  48         gta02_vib_priv.fiq_count++;
  49
  50         if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
  51                 /* idle */
  52                 return 0;
  53
  54         if ((u8)gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
  55                 gta02_gpb_setpin(gta02_vib_priv.vib_gpio_pin, 0);
  56
  57         if ((u8)gta02_vib_priv.fiq_count)
  58                 return 1;
  59
  60         gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
  61         if (gta02_vib_priv.vib_pwm_latched)
  62                 gta02_gpb_setpin(gta02_vib_priv.vib_gpio_pin, 1);
  63
  64         return 1;
  65 }
  66
  67 static void gta02_vib_vib_set(struct led_classdev *led_cdev,
  68                                 enum led_brightness value)
  69 {
  70     gta02_vib_priv.vib_pwm = value; /* set it for FIQ */
  71     gta02_vib_priv.pdata->kick_fiq(); /* start up FIQs if not already going */
  72 }
  73
  74 static struct gta02_vib_priv gta02_vib_led = {
  75         .cdev = {
  76                 .name = "gta02:vibrator",
  77                 .brightness_set = gta02_vib_vib_set,
  78         },
  79 };
  80
  81 static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
  82 {
  83         int rc;
  84
  85         rc = s3c2410_pwm_init(&vp->pwm);
  86         if (rc)
  87                 return rc;
  88
  89         vp->pwm.timerid = PWM3;
  90         /* use same prescaler as arch/arm/plat-s3c24xx/time.c */
  91         vp->pwm.prescaler = (6 - 1) / 2;
  92         vp->pwm.divider = S3C2410_TCFG1_MUX3_DIV2;
  93         vp->pwm.counter = COUNTER;
  94         vp->pwm.comparer = COUNTER;
  95
  96         rc = s3c2410_pwm_enable(&vp->pwm);
  97         if (rc)
  98                 return rc;
  99
 100         s3c2410_pwm_start(&vp->pwm);
 101
 102         return 0;
 103 }
 104
 105 #ifdef CONFIG_PM
 106 static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
 107 {
 108         led_classdev_suspend(&gta02_vib_led.cdev);
 109         if (gta02_vib_priv.pdata)
 110                 gta02_vib_priv.pdata->disable_fiq();
 111         return 0;
 112 }
 113
 114 static int gta02_vib_resume(struct platform_device *dev)
 115 {
 116         struct gta02_vib_priv *vp = platform_get_drvdata(dev);
 117
 118         if (vp->has_pwm)
 119                 gta02_vib_init_hw(vp);
 120
 121         led_classdev_resume(&gta02_vib_led.cdev);
 122         if (gta02_vib_priv.pdata)
 123                 gta02_vib_priv.pdata->enable_fiq();
 124
 125         return 0;
 126 }
 127 #endif /* CONFIG_PM */
 128
 129 static int __init gta02_vib_probe(struct platform_device *pdev)
 130 {
 131         struct resource *r;
 132
 133         r = platform_get_resource(pdev, 0, 0);
 134         if (!r || !r->start)
 135                 return -EIO;
 136
 137         gta02_vib_led.gpio = r->start;
 138
 139         gta02_vib_priv.pdata = pdev->dev.platform_data;
 140         platform_set_drvdata(pdev, &gta02_vib_led);
 141
 142     gta02_gpb_setpin(gta02_vib_led.gpio, 0); /* off */
 143     s3c2410_gpio_cfgpin(gta02_vib_led.gpio, S3C2410_GPIO_OUTPUT);
 144     /* safe, kmalloc'd copy needed for FIQ ISR */
 145     gta02_vib_priv.vib_gpio_pin = gta02_vib_led.gpio;
 146     gta02_vib_priv.vib_pwm = 0; /* off */
 147         spin_lock_init(&gta02_vib_led.lock);
 148
 149         return led_classdev_register(&pdev->dev, &gta02_vib_led.cdev);
 150 }
 151
 152 static int gta02_vib_remove(struct platform_device *pdev)
 153 {
 154     gta02_vib_priv.vib_pwm = 0; /* off */
 155         /* would only need kick if already off so no kick needed */
 156
 157         if (gta02_vib_led.has_pwm)
 158                 s3c2410_pwm_disable(&gta02_vib_led.pwm);
 159
 160         led_classdev_unregister(&gta02_vib_led.cdev);
 161
 162         return 0;
 163 }
 164
 165 static struct platform_driver gta02_vib_driver = {
 166         .probe          = gta02_vib_probe,
 167         .remove         = gta02_vib_remove,
 168 #ifdef CONFIG_PM
 169         .suspend        = gta02_vib_suspend,
 170         .resume         = gta02_vib_resume,
 171 #endif
 172         .driver         = {
 173                 .name           = "gta02-vibrator",
 174         },
 175 };
 176
 177 static int __init gta02_vib_init(void)
 178 {
 179         return platform_driver_register(&gta02_vib_driver);
 180 }
 181
 182 static void __exit gta02_vib_exit(void)
 183 {
 184         platform_driver_unregister(&gta02_vib_driver);
 185 }
 186
 187 module_init(gta02_vib_init);
 188 module_exit(gta02_vib_exit);
 189
 190 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 191 MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
 192 MODULE_LICENSE("GPL");