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
26 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
27 MODULE_DESCRIPTION("ixp4xx beeper driver");
28 MODULE_LICENSE("GPL");
29 MODULE_ALIAS("platform:ixp4xx-beeper");
30
31 static DEFINE_SPINLOCK(beep_lock);
32
ixp4xx_spkr_control(unsigned int pin,unsigned int count)33 static 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
ixp4xx_spkr_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)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) 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
ixp4xx_spkr_interrupt(int irq,void * dev_id)77 static 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
ixp4xx_spkr_probe(struct platform_device * dev)90 static 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
ixp4xx_spkr_remove(struct platform_device * dev)141 static 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
ixp4xx_spkr_shutdown(struct platform_device * dev)158 static 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
168 static 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 };
176 module_platform_driver(ixp4xx_spkr_platform_driver);
177
178