tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <mach/hardware.h>
24
25MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
26MODULE_DESCRIPTION("ixp4xx beeper driver");
27MODULE_LICENSE("GPL");
28MODULE_ALIAS("platform:ixp4xx-beeper");
29
30static DEFINE_SPINLOCK(beep_lock);
31
32static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
33{
34 unsigned long flags;
35
36 spin_lock_irqsave(&beep_lock, flags);
37
38 if (count) {
39 gpio_line_config(pin, IXP4XX_GPIO_OUT);
40 gpio_line_set(pin, IXP4XX_GPIO_LOW);
41
42 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
43 } else {
44 gpio_line_config(pin, IXP4XX_GPIO_IN);
45 gpio_line_set(pin, IXP4XX_GPIO_HIGH);
46
47 *IXP4XX_OSRT2 = 0;
48 }
49
50 spin_unlock_irqrestore(&beep_lock, flags);
51}
52
53static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
54{
55 unsigned int pin = (unsigned int) input_get_drvdata(dev);
56 unsigned int count = 0;
57
58 if (type != EV_SND)
59 return -1;
60
61 switch (code) {
62 case SND_BELL:
63 if (value)
64 value = 1000;
65 case SND_TONE:
66 break;
67 default:
68 return -1;
69 }
70
71 if (value > 20 && value < 32767)
72#ifndef FREQ
73 count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
74#else
75 count = (FREQ / (value * 4)) - 1;
76#endif
77
78 ixp4xx_spkr_control(pin, count);
79
80 return 0;
81}
82
83static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
84{
85 /* clear interrupt */
86 *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
87
88 /* flip the beeper output */
89 *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
90
91 return IRQ_HANDLED;
92}
93
94static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
95{
96 struct input_dev *input_dev;
97 int err;
98
99 input_dev = input_allocate_device();
100 if (!input_dev)
101 return -ENOMEM;
102
103 input_set_drvdata(input_dev, (void *) dev->id);
104
105 input_dev->name = "ixp4xx beeper",
106 input_dev->phys = "ixp4xx/gpio";
107 input_dev->id.bustype = BUS_HOST;
108 input_dev->id.vendor = 0x001f;
109 input_dev->id.product = 0x0001;
110 input_dev->id.version = 0x0100;
111 input_dev->dev.parent = &dev->dev;
112
113 input_dev->evbit[0] = BIT_MASK(EV_SND);
114 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
115 input_dev->event = ixp4xx_spkr_event;
116
117 err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
118 IRQF_DISABLED | IRQF_NO_SUSPEND, "ixp4xx-beeper",
119 (void *) dev->id);
120 if (err)
121 goto err_free_device;
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, dev);
133 err_free_device:
134 input_free_device(input_dev);
135
136 return err;
137}
138
139static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
140{
141 struct input_dev *input_dev = platform_get_drvdata(dev);
142 unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
143
144 input_unregister_device(input_dev);
145 platform_set_drvdata(dev, NULL);
146
147 /* turn the speaker off */
148 disable_irq(IRQ_IXP4XX_TIMER2);
149 ixp4xx_spkr_control(pin, 0);
150
151 free_irq(IRQ_IXP4XX_TIMER2, dev);
152
153 return 0;
154}
155
156static void ixp4xx_spkr_shutdown(struct platform_device *dev)
157{
158 struct input_dev *input_dev = platform_get_drvdata(dev);
159 unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
160
161 /* turn off the speaker */
162 disable_irq(IRQ_IXP4XX_TIMER2);
163 ixp4xx_spkr_control(pin, 0);
164}
165
166static struct platform_driver ixp4xx_spkr_platform_driver = {
167 .driver = {
168 .name = "ixp4xx-beeper",
169 .owner = THIS_MODULE,
170 },
171 .probe = ixp4xx_spkr_probe,
172 .remove = __devexit_p(ixp4xx_spkr_remove),
173 .shutdown = ixp4xx_spkr_shutdown,
174};
175
176static int __init ixp4xx_spkr_init(void)
177{
178 return platform_driver_register(&ixp4xx_spkr_platform_driver);
179}
180
181static void __exit ixp4xx_spkr_exit(void)
182{
183 platform_driver_unregister(&ixp4xx_spkr_platform_driver);
184}
185
186module_init(ixp4xx_spkr_init);
187module_exit(ixp4xx_spkr_exit);