2 * LED driver for the vibrator of the Openmoko GTA01/GTA02 GSM Phones
4 * (C) 2006-2008 by Openmoko, Inc.
5 * Author: Harald Welte <laforge@openmoko.org>
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.
12 * Javi Roman <javiroman@kernel-labs.org>:
13 * Implement PWM support for GTA01Bv4 and later
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>
23 #include <mach/regs-gpio.h>
24 #include <plat/regs-timer.h>
25 #include <linux/gta02-vibrator.h>
27 #include <linux/gta02-shadow.h>
31 static struct gta02_vib_priv {
32 struct led_classdev cdev;
36 struct s3c2410_pwm pwm;
38 unsigned long vib_gpio_pin; /* which pin to meddle with */
39 u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
43 struct gta02_vib_platform_data *pdata;
46 int gta02_vibrator_fiq_handler(void)
48 gta02_vib_priv.fiq_count++;
50 if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
54 if ((u8)gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
55 s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 0);
57 if ((u8)gta02_vib_priv.fiq_count)
60 gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
61 if (gta02_vib_priv.vib_pwm_latched)
62 s3c2410_gpio_setpin(gta02_vib_priv.vib_gpio_pin, 1);
67 static void gta02_vib_vib_set(struct led_classdev *led_cdev,
68 enum led_brightness value)
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 */
74 static struct gta02_vib_priv gta02_vib_led = {
76 .name = "gta02:vibrator",
77 .brightness_set = gta02_vib_vib_set,
81 static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
85 rc = s3c2410_pwm_init(&vp->pwm);
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;
96 rc = s3c2410_pwm_enable(&vp->pwm);
100 s3c2410_pwm_start(&vp->pwm);
106 static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
108 led_classdev_suspend(>a02_vib_led.cdev);
109 if (gta02_vib_priv.pdata)
110 gta02_vib_priv.pdata->disable_fiq();
114 static int gta02_vib_resume(struct platform_device *dev)
116 struct gta02_vib_priv *vp = platform_get_drvdata(dev);
119 gta02_vib_init_hw(vp);
121 led_classdev_resume(>a02_vib_led.cdev);
122 if (gta02_vib_priv.pdata)
123 gta02_vib_priv.pdata->enable_fiq();
127 #endif /* CONFIG_PM */
129 static int __init gta02_vib_probe(struct platform_device *pdev)
133 r = platform_get_resource(pdev, 0, 0);
137 gta02_vib_led.gpio = r->start;
139 gta02_vib_priv.pdata = pdev->dev.platform_data;
140 platform_set_drvdata(pdev, >a02_vib_led);
142 s3c2410_gpio_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(>a02_vib_led.lock);
149 return led_classdev_register(&pdev->dev, >a02_vib_led.cdev);
152 static int gta02_vib_remove(struct platform_device *pdev)
154 gta02_vib_priv.vib_pwm = 0; /* off */
155 /* would only need kick if already off so no kick needed */
157 if (gta02_vib_led.has_pwm)
158 s3c2410_pwm_disable(>a02_vib_led.pwm);
160 led_classdev_unregister(>a02_vib_led.cdev);
165 static struct platform_driver gta02_vib_driver = {
166 .probe = gta02_vib_probe,
167 .remove = gta02_vib_remove,
169 .suspend = gta02_vib_suspend,
170 .resume = gta02_vib_resume,
173 .name = "gta02-vibrator",
177 static int __init gta02_vib_init(void)
179 return platform_driver_register(>a02_vib_driver);
182 static void __exit gta02_vib_exit(void)
184 platform_driver_unregister(>a02_vib_driver);
187 module_init(gta02_vib_init);
188 module_exit(gta02_vib_exit);
190 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
191 MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
192 MODULE_LICENSE("GPL");