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Alessandro Zummo01387952006-01-29 21:50:40 -05001/*
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>
Alessandro Zummoa09d31ff2006-02-15 00:48:40 -050022#include <linux/interrupt.h>
Alessandro Zummo01387952006-01-29 21:50:40 -050023#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) dev->private;
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, struct pt_regs *regs)
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_dev->private = (void *) dev->id;
103 input_dev->name = "ixp4xx beeper",
104 input_dev->phys = "ixp4xx/gpio";
105 input_dev->id.bustype = BUS_HOST;
106 input_dev->id.vendor = 0x001f;
107 input_dev->id.product = 0x0001;
108 input_dev->id.version = 0x0100;
109 input_dev->cdev.dev = &dev->dev;
110
111 input_dev->evbit[0] = BIT(EV_SND);
112 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
113 input_dev->event = ixp4xx_spkr_event;
114
115 err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700116 IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);
Alessandro Zummo01387952006-01-29 21:50:40 -0500117 if (err)
118 goto err_free_device;
119
120 err = input_register_device(input_dev);
121 if (err)
122 goto err_free_irq;
123
124 platform_set_drvdata(dev, input_dev);
125
126 return 0;
127
128 err_free_irq:
129 free_irq(IRQ_IXP4XX_TIMER2, dev);
130 err_free_device:
131 input_free_device(input_dev);
132
133 return err;
134}
135
136static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
137{
138 struct input_dev *input_dev = platform_get_drvdata(dev);
139 unsigned int pin = (unsigned int) input_dev->private;
140
141 input_unregister_device(input_dev);
142 platform_set_drvdata(dev, NULL);
143
144 /* turn the speaker off */
145 disable_irq(IRQ_IXP4XX_TIMER2);
146 ixp4xx_spkr_control(pin, 0);
147
148 free_irq(IRQ_IXP4XX_TIMER2, dev);
149
150 return 0;
151}
152
153static void ixp4xx_spkr_shutdown(struct platform_device *dev)
154{
155 struct input_dev *input_dev = platform_get_drvdata(dev);
156 unsigned int pin = (unsigned int) input_dev->private;
157
158 /* turn off the speaker */
159 disable_irq(IRQ_IXP4XX_TIMER2);
160 ixp4xx_spkr_control(pin, 0);
161}
162
163static struct platform_driver ixp4xx_spkr_platform_driver = {
164 .driver = {
165 .name = "ixp4xx-beeper",
166 .owner = THIS_MODULE,
167 },
168 .probe = ixp4xx_spkr_probe,
169 .remove = __devexit_p(ixp4xx_spkr_remove),
170 .shutdown = ixp4xx_spkr_shutdown,
171};
172
173static int __init ixp4xx_spkr_init(void)
174{
175 return platform_driver_register(&ixp4xx_spkr_platform_driver);
176}
177
178static void __exit ixp4xx_spkr_exit(void)
179{
180 platform_driver_unregister(&ixp4xx_spkr_platform_driver);
181}
182
183module_init(ixp4xx_spkr_init);
184module_exit(ixp4xx_spkr_exit);