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>
29 static struct gta02_vib_priv {
30 struct led_classdev cdev;
34 struct s3c2410_pwm pwm;
36 unsigned long vib_gpio_pin; /* which pin to meddle with */
37 u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
41 struct gta02_vib_platform_data *pdata;
44 int gta02_vibrator_fiq_handler(void)
46 gta02_vib_priv.fiq_count++;
48 if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
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);
55 if ((u8)gta02_vib_priv.fiq_count)
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);
65 static void gta02_vib_vib_set(struct led_classdev *led_cdev,
66 enum led_brightness value)
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 */
72 static struct gta02_vib_priv gta02_vib_led = {
74 .name = "gta02:vibrator",
75 .brightness_set = gta02_vib_vib_set,
79 static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
83 rc = s3c2410_pwm_init(&vp->pwm);
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;
94 rc = s3c2410_pwm_enable(&vp->pwm);
98 s3c2410_pwm_start(&vp->pwm);
104 static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
106 led_classdev_suspend(>a02_vib_led.cdev);
107 if (gta02_vib_priv.pdata)
108 gta02_vib_priv.pdata->disable_fiq();
112 static int gta02_vib_resume(struct platform_device *dev)
114 struct gta02_vib_priv *vp = platform_get_drvdata(dev);
117 gta02_vib_init_hw(vp);
119 led_classdev_resume(>a02_vib_led.cdev);
120 if (gta02_vib_priv.pdata)
121 gta02_vib_priv.pdata->enable_fiq();
125 #endif /* CONFIG_PM */
127 static int __init gta02_vib_probe(struct platform_device *pdev)
131 r = platform_get_resource(pdev, 0, 0);
135 gta02_vib_led.gpio = r->start;
137 gta02_vib_priv.pdata = pdev->dev.platform_data;
138 platform_set_drvdata(pdev, >a02_vib_led);
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(>a02_vib_led.lock);
147 return led_classdev_register(&pdev->dev, >a02_vib_led.cdev);
150 static int gta02_vib_remove(struct platform_device *pdev)
152 gta02_vib_priv.vib_pwm = 0; /* off */
153 /* would only need kick if already off so no kick needed */
155 if (gta02_vib_led.has_pwm)
156 s3c2410_pwm_disable(>a02_vib_led.pwm);
158 led_classdev_unregister(>a02_vib_led.cdev);
163 static struct platform_driver gta02_vib_driver = {
164 .probe = gta02_vib_probe,
165 .remove = gta02_vib_remove,
167 .suspend = gta02_vib_suspend,
168 .resume = gta02_vib_resume,
171 .name = "gta02-vibrator",
175 static int __init gta02_vib_init(void)
177 return platform_driver_register(>a02_vib_driver);
180 static void __exit gta02_vib_exit(void)
182 platform_driver_unregister(>a02_vib_driver);
185 module_init(gta02_vib_init);
186 module_exit(gta02_vib_exit);
188 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
189 MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
190 MODULE_LICENSE("GPL");