Root/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
29static 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
44int 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
65static 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
72static struct gta02_vib_priv gta02_vib_led = {
73    .cdev = {
74        .name = "gta02:vibrator",
75        .brightness_set = gta02_vib_vib_set,
76    },
77};
78
79static 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
104static 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
112static 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
127static 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
150static 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
163static 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
175static int __init gta02_vib_init(void)
176{
177    return platform_driver_register(&gta02_vib_driver);
178}
179
180static void __exit gta02_vib_exit(void)
181{
182    platform_driver_unregister(&gta02_vib_driver);
183}
184
185module_init(gta02_vib_init);
186module_exit(gta02_vib_exit);
187
188MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
189MODULE_DESCRIPTION("Openmoko Freerunner vibrator driver");
190MODULE_LICENSE("GPL");
191

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