ixp4xx-beeper.c 4.16 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
/*
 * Generic IXP4xx beeper driver
 *
 * Copyright (C) 2005 Tower Technologies
 *
 * based on nslu2-io.c
 *  Copyright (C) 2004 Karen Spearel
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Maintainers: http://www.nslu2-linux.org/
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
22
#include <linux/interrupt.h>
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
#include <asm/hardware.h>

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("ixp4xx beeper driver");
MODULE_LICENSE("GPL");

static DEFINE_SPINLOCK(beep_lock);

static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
{
	unsigned long flags;

	spin_lock_irqsave(&beep_lock, flags);

	 if (count) {
		gpio_line_config(pin, IXP4XX_GPIO_OUT);
		gpio_line_set(pin, IXP4XX_GPIO_LOW);

		*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
	} else {
		gpio_line_config(pin, IXP4XX_GPIO_IN);
		gpio_line_set(pin, IXP4XX_GPIO_HIGH);

		*IXP4XX_OSRT2 = 0;
	}

	spin_unlock_irqrestore(&beep_lock, flags);
}

static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
Frederik Deweerdt's avatar
Frederik Deweerdt committed
54
	unsigned int pin = (unsigned int) input_get_drvdata(dev);
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
	unsigned int count = 0;

	if (type != EV_SND)
		return -1;

	switch (code) {
		case SND_BELL:
			if (value)
				value = 1000;
		case SND_TONE:
			break;
		default:
			return -1;
	}

	if (value > 20 && value < 32767)
#ifndef FREQ
		count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
#else
		count = (FREQ / (value * 4)) - 1;
#endif

	ixp4xx_spkr_control(pin, count);

	return 0;
}

82
static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
{
	/* clear interrupt */
	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;

	/* flip the beeper output */
	*IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);

	return IRQ_HANDLED;
}

static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
{
	struct input_dev *input_dev;
	int err;

	input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

102
103
	input_set_drvdata(input_dev, (void *) dev->id);

104
105
106
107
108
109
	input_dev->name = "ixp4xx beeper",
	input_dev->phys = "ixp4xx/gpio";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor  = 0x001f;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
110
	input_dev->dev.parent = &dev->dev;
111
112
113
114
115
116

	input_dev->evbit[0] = BIT(EV_SND);
	input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
	input_dev->event = ixp4xx_spkr_event;

	err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
117
			  IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
	if (err)
		goto err_free_device;

	err = input_register_device(input_dev);
	if (err)
		goto err_free_irq;

	platform_set_drvdata(dev, input_dev);

	return 0;

 err_free_irq:
	free_irq(IRQ_IXP4XX_TIMER2, dev);
 err_free_device:
	input_free_device(input_dev);

	return err;
}

static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
{
	struct input_dev *input_dev = platform_get_drvdata(dev);
140
	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

	input_unregister_device(input_dev);
	platform_set_drvdata(dev, NULL);

	/* turn the speaker off */
	disable_irq(IRQ_IXP4XX_TIMER2);
	ixp4xx_spkr_control(pin, 0);

	free_irq(IRQ_IXP4XX_TIMER2, dev);

	return 0;
}

static void ixp4xx_spkr_shutdown(struct platform_device *dev)
{
	struct input_dev *input_dev = platform_get_drvdata(dev);
157
	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
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

	/* turn off the speaker */
	disable_irq(IRQ_IXP4XX_TIMER2);
	ixp4xx_spkr_control(pin, 0);
}

static struct platform_driver ixp4xx_spkr_platform_driver = {
	.driver		= {
		.name	= "ixp4xx-beeper",
		.owner	= THIS_MODULE,
	},
	.probe		= ixp4xx_spkr_probe,
	.remove		= __devexit_p(ixp4xx_spkr_remove),
	.shutdown	= ixp4xx_spkr_shutdown,
};

static int __init ixp4xx_spkr_init(void)
{
	return platform_driver_register(&ixp4xx_spkr_platform_driver);
}

static void __exit ixp4xx_spkr_exit(void)
{
	platform_driver_unregister(&ixp4xx_spkr_platform_driver);
}

module_init(ixp4xx_spkr_init);
module_exit(ixp4xx_spkr_exit);