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 <linux/gpio.h>
24#include <mach/hardware.h>
25
26MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
27MODULE_DESCRIPTION("ixp4xx beeper driver");
28MODULE_LICENSE("GPL");
29MODULE_ALIAS("platform:ixp4xx-beeper");
30
31static DEFINE_SPINLOCK(beep_lock);
32
33static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
34{
35	unsigned long flags;
36
37	spin_lock_irqsave(&beep_lock, flags);
38
39	if (count) {
40		gpio_direction_output(pin, 0);
41		*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
42	} else {
43		gpio_direction_output(pin, 1);
44		gpio_direction_input(pin);
45		*IXP4XX_OSRT2 = 0;
46	}
47
48	spin_unlock_irqrestore(&beep_lock, flags);
49}
50
51static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
52{
53	unsigned int pin = (unsigned int) input_get_drvdata(dev);
54	unsigned int count = 0;
55
56	if (type != EV_SND)
57		return -1;
58
59	switch (code) {
60		case SND_BELL:
61			if (value)
62				value = 1000;
63		case SND_TONE:
64			break;
65		default:
66			return -1;
67	}
68
69	if (value > 20 && value < 32767)
70		count = (ixp4xx_timer_freq / (value * 4)) - 1;
71
72	ixp4xx_spkr_control(pin, count);
73
74	return 0;
75}
76
77static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
78{
79	unsigned int pin = (unsigned int) dev_id;
80
81	/* clear interrupt */
82	*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
83
84	/* flip the beeper output */
85	gpio_set_value(pin, !gpio_get_value(pin));
86
87	return IRQ_HANDLED;
88}
89
90static int ixp4xx_spkr_probe(struct platform_device *dev)
91{
92	struct input_dev *input_dev;
93	int err;
94
95	input_dev = input_allocate_device();
96	if (!input_dev)
97		return -ENOMEM;
98
99	input_set_drvdata(input_dev, (void *) dev->id);
100
101	input_dev->name = "ixp4xx beeper",
102	input_dev->phys = "ixp4xx/gpio";
103	input_dev->id.bustype = BUS_HOST;
104	input_dev->id.vendor  = 0x001f;
105	input_dev->id.product = 0x0001;
106	input_dev->id.version = 0x0100;
107	input_dev->dev.parent = &dev->dev;
108
109	input_dev->evbit[0] = BIT_MASK(EV_SND);
110	input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
111	input_dev->event = ixp4xx_spkr_event;
112
113	err = gpio_request(dev->id, "ixp4-beeper");
114	if (err)
115		goto err_free_device;
116
117	err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
118			  IRQF_NO_SUSPEND, "ixp4xx-beeper",
119			  (void *) dev->id);
120	if (err)
121		goto err_free_gpio;
122
123	err = input_register_device(input_dev);
124	if (err)
125		goto err_free_irq;
126
127	platform_set_drvdata(dev, input_dev);
128
129	return 0;
130
131 err_free_irq:
132	free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
133 err_free_gpio:
134	gpio_free(dev->id);
135 err_free_device:
136	input_free_device(input_dev);
137
138	return err;
139}
140
141static int ixp4xx_spkr_remove(struct platform_device *dev)
142{
143	struct input_dev *input_dev = platform_get_drvdata(dev);
144	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
145
146	input_unregister_device(input_dev);
147
148	/* turn the speaker off */
149	disable_irq(IRQ_IXP4XX_TIMER2);
150	ixp4xx_spkr_control(pin, 0);
151
152	free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
153	gpio_free(dev->id);
154
155	return 0;
156}
157
158static void ixp4xx_spkr_shutdown(struct platform_device *dev)
159{
160	struct input_dev *input_dev = platform_get_drvdata(dev);
161	unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
162
163	/* turn off the speaker */
164	disable_irq(IRQ_IXP4XX_TIMER2);
165	ixp4xx_spkr_control(pin, 0);
166}
167
168static struct platform_driver ixp4xx_spkr_platform_driver = {
169	.driver		= {
170		.name	= "ixp4xx-beeper",
171	},
172	.probe		= ixp4xx_spkr_probe,
173	.remove		= ixp4xx_spkr_remove,
174	.shutdown	= ixp4xx_spkr_shutdown,
175};
176module_platform_driver(ixp4xx_spkr_platform_driver);
177
178