summaryrefslogtreecommitdiffstats
path: root/target/linux/s3c24xx/files-2.6.30/drivers/leds/leds-gta02-vibrator.c
blob: 653a9fb287fc3759f2b19753a86b51317fca3470 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/*
 * LED driver for the vibrator of the Openmoko GTA01/GTA02 GSM Phones
 *
 * (C) 2006-2008 by Openmoko, Inc.
 * Author: Harald Welte <laforge@openmoko.org>
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Javi Roman <javiroman@kernel-labs.org>:
 *	Implement PWM support for GTA01Bv4 and later
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <plat/pwm.h>
#include <mach/regs-gpio.h>
#include <plat/regs-timer.h>
#include <linux/gta02-vibrator.h>

#include <linux/gta02-shadow.h>

#define COUNTER 64

static struct gta02_vib_priv {
	struct led_classdev cdev;
	unsigned int gpio;
	spinlock_t lock;
	unsigned int has_pwm;
	struct s3c2410_pwm pwm;

	unsigned long vib_gpio_pin; /* which pin to meddle with */
	u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
	u8 vib_pwm_latched;
	u32 fiq_count;

	struct gta02_vib_platform_data *pdata;
} gta02_vib_priv;

int gta02_vibrator_fiq_handler(void)
{
	gta02_vib_priv.fiq_count++;

	if (!gta02_vib_priv.vib_pwm_latched && !gta02_vib_priv.vib_pwm)
		/* idle */
		return 0;

	if ((u8)gta02_vib_priv.fiq_count == gta02_vib_priv.vib_pwm_latched)
		gta02_gpb_setpin(gta02_vib_priv.vib_gpio_pin, 0);

	if ((u8)gta02_vib_priv.fiq_count)
		return 1;

	gta02_vib_priv.vib_pwm_latched = gta02_vib_priv.vib_pwm;
	if (gta02_vib_priv.vib_pwm_latched)
		gta02_gpb_setpin(gta02_vib_priv.vib_gpio_pin, 1);

	return 1;
}

static void gta02_vib_vib_set(struct led_classdev *led_cdev,
				enum led_brightness value)
{
    gta02_vib_priv.vib_pwm = value; /* set it for FIQ */
    gta02_vib_priv.pdata->kick_fiq(); /* start up FIQs if not already going */
}

static struct gta02_vib_priv gta02_vib_led = {
	.cdev = {
		.name = "gta02:vibrator",
		.brightness_set = gta02_vib_vib_set,
	},
};

static int gta02_vib_init_hw(struct gta02_vib_priv *vp)
{
	int rc;

	rc = s3c2410_pwm_init(&vp->pwm);
	if (rc)
		return rc;

	vp->pwm.timerid = PWM3;
	/* use same prescaler as arch/arm/plat-s3c24xx/time.c */
	vp->pwm.prescaler = (6 - 1) / 2;
	vp->pwm.divider = S3C2410_TCFG1_MUX3_DIV2;
	vp->pwm.counter = COUNTER;
	vp->pwm.comparer = COUNTER;

	rc = s3c2410_pwm_enable(&vp->pwm);
	if (rc)
		return rc;

	s3c2410_pwm_start(&vp->pwm);

	return 0;
}

#ifdef CONFIG_PM
static int gta02_vib_suspend(struct platform_device *dev, pm_message_t state)
{
	led_classdev_suspend(&gta02_vib_led.cdev);
	if (gta02_vib_priv.pdata)
		gta02_vib_priv.pdata->disable_fiq();
	return 0;
}

static int gta02_vib_resume(struct platform_device *dev)
{
	struct gta02_vib_priv *vp = platform_get_drvdata(dev);

	if (vp->has_pwm)
		gta02_vib_init_hw(vp);

	led_classdev_resume(&gta02_vib_led.cdev);
	if (gta02_vib_priv.pdata)
		gta02_vib_priv.pdata->enable_fiq();

	return 0;
}
#endif /* CONFIG_PM */

static int __init gta02_vib_probe(struct platform_device *pdev)
{
	struct resource *r;

	r = platform_get_resource(pdev, 0, 0);
	if (!r || !r->start)
		return -EIO;

	gta02_vib_led.gpio = r->start;

	gta02_vib_priv.pdata = pdev->dev.platform_data;
	platform_set_drvdata(pdev, &gta02_vib_led);

    gta02_gpb_setpin(gta02_vib_led.gpio, 0); /* off */
    s3c2410_gpio_cfgpin(gta02_vib_led.gpio, S3C2410_GPIO_OUTPUT);
    /* safe, kmalloc'd copy needed for FIQ ISR */
    gta02_vib_priv.vib_gpio_pin = gta02_vib_led.gpio;
    gta02_vib_priv.vib_pwm = 0; /* off */
	spin_lock_init(&gta02_vib_led.lock);

	return led_classdev_register(&pdev->dev, &gta02_vib_led.cdev);
}

static int gta02_vib_remove(struct platform_device *pdev)
{
    gta02_vib_priv.vib_pwm = 0; /* off */
	/* would only need kick if already off so no kick needed */

	if (gta02_vib_led.has_pwm)
		s3c2410_pwm_disable(&gta02_vib_led.pwm);

	led_classdev_unregister(&gta02_vib_led.cdev);

	return 0;
}

static struct platform_driver gta02_vib_driver = {
	.probe		= gta02_vib_probe,
	.remove		= gta02_vib_remove,
#ifdef CONFIG_PM
	.suspend	= gta02_vib_suspend,
	.resume		= gta02_vib_resume,
#endif
	.driver		= {
		.name		= "gta02-vibrator",
	},
};

static int __init gta02_vib_init(void)
{
	return platform_driver_register(&gta02_vib_driver);
}

static void __exit gta02_vib_exit(void)
{
	platform_driver_unregister(&gta02_vib_driver);
}

module_init(gta02_vib_init);
module_exit(gta02_vib_exit);

MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
MODULE_LICENSE("GPL");