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1/*
2 * SGI Volume Button interface driver
3 *
4 * Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20#include <linux/input-polldev.h>
21#include <linux/ioport.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25
26#ifdef CONFIG_SGI_IP22
27#include <asm/sgi/ioc.h>
28
29static inline u8 button_status(void)
30{
31 u8 status;
32
33 status = readb(&sgioc->panel) ^ 0xa0;
34 return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
35}
36#endif
37
38#ifdef CONFIG_SGI_IP32
39#include <asm/ip32/mace.h>
40
41static inline u8 button_status(void)
42{
43 u64 status;
44
45 status = readq(&mace->perif.audio.control);
46 writeq(status & ~(3U << 23), &mace->perif.audio.control);
47
48 return (status >> 23) & 3;
49}
50#endif
51
52#define BUTTONS_POLL_INTERVAL 30 /* msec */
53#define BUTTONS_COUNT_THRESHOLD 3
54
55static const unsigned short sgi_map[] = {
56 KEY_VOLUMEDOWN,
57 KEY_VOLUMEUP
58};
59
60struct buttons_dev {
61 struct input_polled_dev *poll_dev;
62 unsigned short keymap[ARRAY_SIZE(sgi_map)];
63 int count[ARRAY_SIZE(sgi_map)];
64};
65
66static void handle_buttons(struct input_polled_dev *dev)
67{
68 struct buttons_dev *bdev = dev->private;
69 struct input_dev *input = dev->input;
70 u8 status;
71 int i;
72
73 status = button_status();
74
75 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
76 if (status & (1U << i)) {
77 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
78 input_event(input, EV_MSC, MSC_SCAN, i);
79 input_report_key(input, bdev->keymap[i], 1);
80 input_sync(input);
81 }
82 } else {
83 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
84 input_event(input, EV_MSC, MSC_SCAN, i);
85 input_report_key(input, bdev->keymap[i], 0);
86 input_sync(input);
87 }
88 bdev->count[i] = 0;
89 }
90 }
91}
92
93static int sgi_buttons_probe(struct platform_device *pdev)
94{
95 struct buttons_dev *bdev;
96 struct input_polled_dev *poll_dev;
97 struct input_dev *input;
98 int error, i;
99
100 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
101 poll_dev = input_allocate_polled_device();
102 if (!bdev || !poll_dev) {
103 error = -ENOMEM;
104 goto err_free_mem;
105 }
106
107 memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
108
109 poll_dev->private = bdev;
110 poll_dev->poll = handle_buttons;
111 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
112
113 input = poll_dev->input;
114 input->name = "SGI buttons";
115 input->phys = "sgi/input0";
116 input->id.bustype = BUS_HOST;
117 input->dev.parent = &pdev->dev;
118
119 input->keycode = bdev->keymap;
120 input->keycodemax = ARRAY_SIZE(bdev->keymap);
121 input->keycodesize = sizeof(unsigned short);
122
123 input_set_capability(input, EV_MSC, MSC_SCAN);
124 __set_bit(EV_KEY, input->evbit);
125 for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
126 __set_bit(bdev->keymap[i], input->keybit);
127 __clear_bit(KEY_RESERVED, input->keybit);
128
129 bdev->poll_dev = poll_dev;
130 platform_set_drvdata(pdev, bdev);
131
132 error = input_register_polled_device(poll_dev);
133 if (error)
134 goto err_free_mem;
135
136 return 0;
137
138 err_free_mem:
139 input_free_polled_device(poll_dev);
140 kfree(bdev);
141 return error;
142}
143
144static int sgi_buttons_remove(struct platform_device *pdev)
145{
146 struct buttons_dev *bdev = platform_get_drvdata(pdev);
147
148 input_unregister_polled_device(bdev->poll_dev);
149 input_free_polled_device(bdev->poll_dev);
150 kfree(bdev);
151
152 return 0;
153}
154
155static struct platform_driver sgi_buttons_driver = {
156 .probe = sgi_buttons_probe,
157 .remove = sgi_buttons_remove,
158 .driver = {
159 .name = "sgibtns",
160 },
161};
162module_platform_driver(sgi_buttons_driver);
163
164MODULE_LICENSE("GPL");
165

Warning: That file was not part of the compilation database. It may have many parsing errors.