Commit | Line | Data |
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01387959 AZ |
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 | ||
24 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
25 | MODULE_DESCRIPTION("ixp4xx beeper driver"); | |
26 | MODULE_LICENSE("GPL"); | |
27 | ||
28 | static DEFINE_SPINLOCK(beep_lock); | |
29 | ||
30 | static 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 | ||
51 | static 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 | ||
81 | static 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 | ||
92 | static 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 | ||
135 | static 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 | ||
152 | static 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 | ||
162 | static 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 | ||
172 | static int __init ixp4xx_spkr_init(void) | |
173 | { | |
174 | return platform_driver_register(&ixp4xx_spkr_platform_driver); | |
175 | } | |
176 | ||
177 | static void __exit ixp4xx_spkr_exit(void) | |
178 | { | |
179 | platform_driver_unregister(&ixp4xx_spkr_platform_driver); | |
180 | } | |
181 | ||
182 | module_init(ixp4xx_spkr_init); | |
183 | module_exit(ixp4xx_spkr_exit); |