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path: root/drivers/input/misc/ixp4xx-beeper.c
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-rw-r--r--drivers/input/misc/ixp4xx-beeper.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/input/misc/ixp4xx-beeper.c b/drivers/input/misc/ixp4xx-beeper.c
new file mode 100644
index 000000000000..d448bb5e4869
--- /dev/null
+++ b/drivers/input/misc/ixp4xx-beeper.c
@@ -0,0 +1,183 @@
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 <asm/hardware.h>
23
24MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
25MODULE_DESCRIPTION("ixp4xx beeper driver");
26MODULE_LICENSE("GPL");
27
28static DEFINE_SPINLOCK(beep_lock);
29
30static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
31{
32 unsigned long flags;
33
34 spin_lock_irqsave(&beep_lock, flags);
35
36 if (count) {
37 gpio_line_config(pin, IXP4XX_GPIO_OUT);
38 gpio_line_set(pin, IXP4XX_GPIO_LOW);
39
40 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
41 } else {
42 gpio_line_config(pin, IXP4XX_GPIO_IN);
43 gpio_line_set(pin, IXP4XX_GPIO_HIGH);
44
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) dev->private;
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#ifndef FREQ
71 count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
72#else
73 count = (FREQ / (value * 4)) - 1;
74#endif
75
76 ixp4xx_spkr_control(pin, count);
77
78 return 0;
79}
80
81static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id, struct pt_regs *regs)
82{
83 /* clear interrupt */
84 *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
85
86 /* flip the beeper output */
87 *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
88
89 return IRQ_HANDLED;
90}
91
92static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
93{
94 struct input_dev *input_dev;
95 int err;
96
97 input_dev = input_allocate_device();
98 if (!input_dev)
99 return -ENOMEM;
100
101 input_dev->private = (void *) dev->id;
102 input_dev->name = "ixp4xx beeper",
103 input_dev->phys = "ixp4xx/gpio";
104 input_dev->id.bustype = BUS_HOST;
105 input_dev->id.vendor = 0x001f;
106 input_dev->id.product = 0x0001;
107 input_dev->id.version = 0x0100;
108 input_dev->cdev.dev = &dev->dev;
109
110 input_dev->evbit[0] = BIT(EV_SND);
111 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
112 input_dev->event = ixp4xx_spkr_event;
113
114 err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
115 SA_INTERRUPT | SA_TIMER, "ixp4xx-beeper", (void *) dev->id);
116 if (err)
117 goto err_free_device;
118
119 err = input_register_device(input_dev);
120 if (err)
121 goto err_free_irq;
122
123 platform_set_drvdata(dev, input_dev);
124
125 return 0;
126
127 err_free_irq:
128 free_irq(IRQ_IXP4XX_TIMER2, dev);
129 err_free_device:
130 input_free_device(input_dev);
131
132 return err;
133}
134
135static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
136{
137 struct input_dev *input_dev = platform_get_drvdata(dev);
138 unsigned int pin = (unsigned int) input_dev->private;
139
140 input_unregister_device(input_dev);
141 platform_set_drvdata(dev, NULL);
142
143 /* turn the speaker off */
144 disable_irq(IRQ_IXP4XX_TIMER2);
145 ixp4xx_spkr_control(pin, 0);
146
147 free_irq(IRQ_IXP4XX_TIMER2, dev);
148
149 return 0;
150}
151
152static void ixp4xx_spkr_shutdown(struct platform_device *dev)
153{
154 struct input_dev *input_dev = platform_get_drvdata(dev);
155 unsigned int pin = (unsigned int) input_dev->private;
156
157 /* turn off the speaker */
158 disable_irq(IRQ_IXP4XX_TIMER2);
159 ixp4xx_spkr_control(pin, 0);
160}
161
162static struct platform_driver ixp4xx_spkr_platform_driver = {
163 .driver = {
164 .name = "ixp4xx-beeper",
165 .owner = THIS_MODULE,
166 },
167 .probe = ixp4xx_spkr_probe,
168 .remove = __devexit_p(ixp4xx_spkr_remove),
169 .shutdown = ixp4xx_spkr_shutdown,
170};
171
172static int __init ixp4xx_spkr_init(void)
173{
174 return platform_driver_register(&ixp4xx_spkr_platform_driver);
175}
176
177static void __exit ixp4xx_spkr_exit(void)
178{
179 platform_driver_unregister(&ixp4xx_spkr_platform_driver);
180}
181
182module_init(ixp4xx_spkr_init);
183module_exit(ixp4xx_spkr_exit);