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