1/*
2 * Generic IXP4xx beeper driver
3 *
4 * Copyright (C) 2005 Tower Technologies
5 *
6 * based on nslu2-io.c
7 *  Copyright (C) 2004 Karen Spearel
8 *
9 * Author: Alessandro Zummo <a.zummo@towertech.it>
10 * Maintainers: http://www.nslu2-linux.org/
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
18#include <linux/module.h>
19#include <linux/input.h>
20#include <linux/delay.h>
21#include <linux/platform_device.h>
22#include <linux/interrupt.h>
23#include <asm/hardware.h>
24
25MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
26MODULE_DESCRIPTION("ixp4xx beeper driver");
27MODULE_LICENSE("GPL");
28
29static DEFINE_SPINLOCK(beep_lock);
30
31static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
32{
33	unsigned long flags;
34
35	spin_lock_irqsave(&beep_lock, flags);
36
37	 if (count) {
38		gpio_line_config(pin, IXP4XX_GPIO_OUT);
39		gpio_line_set(pin, IXP4XX_GPIO_LOW);
40
41		*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
42	} else {
43		gpio_line_config(pin, IXP4XX_GPIO_IN);
44		gpio_line_set(pin, IXP4XX_GPIO_HIGH);
45
46		*IXP4XX_OSRT2 = 0;
47	}
48
49	spin_unlock_irqrestore(&beep_lock, flags);
50}
51
52static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
53{
54	unsigned int pin = (unsigned int) input_get_drvdata(dev);
55	unsigned int count = 0;
56
57	if (type != EV_SND)
58		return -1;
59
60	switch (code) {
61		case SND_BELL:
62			if (value)
63				value = 1000;
64		case SND_TONE:
65			break;
66		default:
67			return -1;
68	}
69
70	if (value > 20 && value < 32767)
71#ifndef FREQ
72		count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
73#else
74		count = (FREQ / (value * 4)) - 1;
75#endif
76
77	ixp4xx_spkr_control(pin, count);
78
79	return 0;
80}
81
82static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
83{
84	/* clear interrupt */
85	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
86
87	/* flip the beeper output */
88	*IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
89
90	return IRQ_HANDLED;
91}
92
93static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
94{
95	struct input_dev *input_dev;
96	int err;
97
98	input_dev = input_allocate_device();
99	if (!input_dev)
100		return -ENOMEM;
101
102	input_set_drvdata(input_dev, (void *) dev->id);
103
104	input_dev->name = "ixp4xx beeper",
105	input_dev->phys = "ixp4xx/gpio";
106	input_dev->id.bustype = BUS_HOST;
107	input_dev->id.vendor  = 0x001f;
108	input_dev->id.product = 0x0001;
109	input_dev->id.version = 0x0100;
110	input_dev->dev.parent = &dev->dev;
111
112	input_dev->evbit[0] = BIT(EV_SND);
113	input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
114	input_dev->event = ixp4xx_spkr_event;
115
116	err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
117			  IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);
118	if (err)
119		goto err_free_device;
120
121	err = input_register_device(input_dev);
122	if (err)
123		goto err_free_irq;
124
125	platform_set_drvdata(dev, input_dev);
126
127	return 0;
128
129 err_free_irq:
130	free_irq(IRQ_IXP4XX_TIMER2, dev);
131 err_free_device:
132	input_free_device(input_dev);
133
134	return err;
135}
136
137static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
138{
139	struct input_dev *input_dev = platform_get_drvdata(dev);
140	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
141
142	input_unregister_device(input_dev);
143	platform_set_drvdata(dev, NULL);
144
145	/* turn the speaker off */
146	disable_irq(IRQ_IXP4XX_TIMER2);
147	ixp4xx_spkr_control(pin, 0);
148
149	free_irq(IRQ_IXP4XX_TIMER2, dev);
150
151	return 0;
152}
153
154static void ixp4xx_spkr_shutdown(struct platform_device *dev)
155{
156	struct input_dev *input_dev = platform_get_drvdata(dev);
157	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
158
159	/* turn off the speaker */
160	disable_irq(IRQ_IXP4XX_TIMER2);
161	ixp4xx_spkr_control(pin, 0);
162}
163
164static struct platform_driver ixp4xx_spkr_platform_driver = {
165	.driver		= {
166		.name	= "ixp4xx-beeper",
167		.owner	= THIS_MODULE,
168	},
169	.probe		= ixp4xx_spkr_probe,
170	.remove		= __devexit_p(ixp4xx_spkr_remove),
171	.shutdown	= ixp4xx_spkr_shutdown,
172};
173
174static int __init ixp4xx_spkr_init(void)
175{
176	return platform_driver_register(&ixp4xx_spkr_platform_driver);
177}
178
179static void __exit ixp4xx_spkr_exit(void)
180{
181	platform_driver_unregister(&ixp4xx_spkr_platform_driver);
182}
183
184module_init(ixp4xx_spkr_init);
185module_exit(ixp4xx_spkr_exit);
186