1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Generic IXP4xx beeper driver
4 *
5 * Copyright (C) 2005 Tower Technologies
6 *
7 * based on nslu2-io.c
8 * Copyright (C) 2004 Karen Spearel
9 *
10 * Author: Alessandro Zummo <a.zummo@towertech.it>
11 * Maintainers: http://www.nslu2-linux.org/
12 */
13
14 #include <linux/module.h>
15 #include <linux/input.h>
16 #include <linux/delay.h>
17 #include <linux/platform_device.h>
18 #include <linux/interrupt.h>
19 #include <linux/gpio.h>
20 #include <mach/hardware.h>
21
22 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
23 MODULE_DESCRIPTION("ixp4xx beeper driver");
24 MODULE_LICENSE("GPL");
25 MODULE_ALIAS("platform:ixp4xx-beeper");
26
27 static DEFINE_SPINLOCK(beep_lock);
28
29 static int ixp4xx_timer2_irq;
30
ixp4xx_spkr_control(unsigned int pin,unsigned int count)31 static 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_direction_output(pin, 0);
39 *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
40 } else {
41 gpio_direction_output(pin, 1);
42 gpio_direction_input(pin);
43 *IXP4XX_OSRT2 = 0;
44 }
45
46 spin_unlock_irqrestore(&beep_lock, flags);
47 }
48
ixp4xx_spkr_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)49 static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
50 {
51 unsigned int pin = (unsigned int) input_get_drvdata(dev);
52 unsigned int count = 0;
53
54 if (type != EV_SND)
55 return -1;
56
57 switch (code) {
58 case SND_BELL:
59 if (value)
60 value = 1000;
61 case SND_TONE:
62 break;
63 default:
64 return -1;
65 }
66
67 if (value > 20 && value < 32767)
68 count = (ixp4xx_timer_freq / (value * 4)) - 1;
69
70 ixp4xx_spkr_control(pin, count);
71
72 return 0;
73 }
74
ixp4xx_spkr_interrupt(int irq,void * dev_id)75 static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
76 {
77 unsigned int pin = (unsigned int) dev_id;
78
79 /* clear interrupt */
80 *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
81
82 /* flip the beeper output */
83 gpio_set_value(pin, !gpio_get_value(pin));
84
85 return IRQ_HANDLED;
86 }
87
ixp4xx_spkr_probe(struct platform_device * dev)88 static int ixp4xx_spkr_probe(struct platform_device *dev)
89 {
90 struct input_dev *input_dev;
91 int irq;
92 int err;
93
94 input_dev = input_allocate_device();
95 if (!input_dev)
96 return -ENOMEM;
97
98 input_set_drvdata(input_dev, (void *) dev->id);
99
100 input_dev->name = "ixp4xx beeper",
101 input_dev->phys = "ixp4xx/gpio";
102 input_dev->id.bustype = BUS_HOST;
103 input_dev->id.vendor = 0x001f;
104 input_dev->id.product = 0x0001;
105 input_dev->id.version = 0x0100;
106 input_dev->dev.parent = &dev->dev;
107
108 input_dev->evbit[0] = BIT_MASK(EV_SND);
109 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
110 input_dev->event = ixp4xx_spkr_event;
111
112 irq = platform_get_irq(dev, 0);
113 if (irq < 0) {
114 err = irq;
115 goto err_free_device;
116 }
117
118 err = gpio_request(dev->id, "ixp4-beeper");
119 if (err)
120 goto err_free_device;
121
122 err = request_irq(irq, &ixp4xx_spkr_interrupt,
123 IRQF_NO_SUSPEND, "ixp4xx-beeper",
124 (void *) dev->id);
125 if (err)
126 goto err_free_gpio;
127 ixp4xx_timer2_irq = irq;
128
129 err = input_register_device(input_dev);
130 if (err)
131 goto err_free_irq;
132
133 platform_set_drvdata(dev, input_dev);
134
135 return 0;
136
137 err_free_irq:
138 free_irq(irq, (void *)dev->id);
139 err_free_gpio:
140 gpio_free(dev->id);
141 err_free_device:
142 input_free_device(input_dev);
143
144 return err;
145 }
146
ixp4xx_spkr_remove(struct platform_device * dev)147 static int ixp4xx_spkr_remove(struct platform_device *dev)
148 {
149 struct input_dev *input_dev = platform_get_drvdata(dev);
150 unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
151
152 input_unregister_device(input_dev);
153
154 /* turn the speaker off */
155 disable_irq(ixp4xx_timer2_irq);
156 ixp4xx_spkr_control(pin, 0);
157
158 free_irq(ixp4xx_timer2_irq, (void *)dev->id);
159 gpio_free(dev->id);
160
161 return 0;
162 }
163
ixp4xx_spkr_shutdown(struct platform_device * dev)164 static void ixp4xx_spkr_shutdown(struct platform_device *dev)
165 {
166 struct input_dev *input_dev = platform_get_drvdata(dev);
167 unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
168
169 /* turn off the speaker */
170 disable_irq(ixp4xx_timer2_irq);
171 ixp4xx_spkr_control(pin, 0);
172 }
173
174 static struct platform_driver ixp4xx_spkr_platform_driver = {
175 .driver = {
176 .name = "ixp4xx-beeper",
177 },
178 .probe = ixp4xx_spkr_probe,
179 .remove = ixp4xx_spkr_remove,
180 .shutdown = ixp4xx_spkr_shutdown,
181 };
182 module_platform_driver(ixp4xx_spkr_platform_driver);
183
184