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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/init.h>
21#include <linux/input-polldev.h>
22#include <linux/ioport.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26
27#ifdef CONFIG_SGI_IP22
28#include <asm/sgi/ioc.h>
29
30static inline u8 button_status(void)
31{
32 u8 status;
33
34 status = readb(&sgioc->panel) ^ 0xa0;
35 return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
36}
37#endif
38
39#ifdef CONFIG_SGI_IP32
40#include <asm/ip32/mace.h>
41
42static inline u8 button_status(void)
43{
44 u64 status;
45
46 status = readq(&mace->perif.audio.control);
47 writeq(status & ~(3U << 23), &mace->perif.audio.control);
48
49 return (status >> 23) & 3;
50}
51#endif
52
53#define BUTTONS_POLL_INTERVAL 30 /* msec */
54#define BUTTONS_COUNT_THRESHOLD 3
55
56static const unsigned short sgi_map[] = {
57 KEY_VOLUMEDOWN,
58 KEY_VOLUMEUP
59};
60
61struct buttons_dev {
62 struct input_polled_dev *poll_dev;
63 unsigned short keymap[ARRAY_SIZE(sgi_map)];
64 int count[ARRAY_SIZE(sgi_map)];
65};
66
67static void handle_buttons(struct input_polled_dev *dev)
68{
69 struct buttons_dev *bdev = dev->private;
70 struct input_dev *input = dev->input;
71 u8 status;
72 int i;
73
74 status = button_status();
75
76 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
77 if (status & (1U << i)) {
78 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
79 input_event(input, EV_MSC, MSC_SCAN, i);
80 input_report_key(input, bdev->keymap[i], 1);
81 input_sync(input);
82 }
83 } else {
84 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
85 input_event(input, EV_MSC, MSC_SCAN, i);
86 input_report_key(input, bdev->keymap[i], 0);
87 input_sync(input);
88 }
89 bdev->count[i] = 0;
90 }
91 }
92}
93
94static int __devinit sgi_buttons_probe(struct platform_device *pdev)
95{
96 struct buttons_dev *bdev;
97 struct input_polled_dev *poll_dev;
98 struct input_dev *input;
99 int error, i;
100
101 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
102 poll_dev = input_allocate_polled_device();
103 if (!bdev || !poll_dev) {
104 error = -ENOMEM;
105 goto err_free_mem;
106 }
107
108 memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
109
110 poll_dev->private = bdev;
111 poll_dev->poll = handle_buttons;
112 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
113
114 input = poll_dev->input;
115 input->name = "SGI buttons";
116 input->phys = "sgi/input0";
117 input->id.bustype = BUS_HOST;
118 input->dev.parent = &pdev->dev;
119
120 input->keycode = bdev->keymap;
121 input->keycodemax = ARRAY_SIZE(bdev->keymap);
122 input->keycodesize = sizeof(unsigned short);
123
124 input_set_capability(input, EV_MSC, MSC_SCAN);
125 __set_bit(EV_KEY, input->evbit);
126 for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
127 __set_bit(bdev->keymap[i], input->keybit);
128 __clear_bit(KEY_RESERVED, input->keybit);
129
130 bdev->poll_dev = poll_dev;
131 dev_set_drvdata(&pdev->dev, bdev);
132
133 error = input_register_polled_device(poll_dev);
134 if (error)
135 goto err_free_mem;
136
137 return 0;
138
139 err_free_mem:
140 input_free_polled_device(poll_dev);
141 kfree(bdev);
142 dev_set_drvdata(&pdev->dev, NULL);
143 return error;
144}
145
146static int __devexit sgi_buttons_remove(struct platform_device *pdev)
147{
148 struct device *dev = &pdev->dev;
149 struct buttons_dev *bdev = dev_get_drvdata(dev);
150
151 input_unregister_polled_device(bdev->poll_dev);
152 input_free_polled_device(bdev->poll_dev);
153 kfree(bdev);
154 dev_set_drvdata(dev, NULL);
155
156 return 0;
157}
158
159static struct platform_driver sgi_buttons_driver = {
160 .probe = sgi_buttons_probe,
161 .remove = __devexit_p(sgi_buttons_remove),
162 .driver = {
163 .name = "sgibtns",
164 .owner = THIS_MODULE,
165 },
166};
167
168static int __init sgi_buttons_init(void)
169{
170 return platform_driver_register(&sgi_buttons_driver);
171}
172
173static void __exit sgi_buttons_exit(void)
174{
175 platform_driver_unregister(&sgi_buttons_driver);
176}
177
178MODULE_LICENSE("GPL");
179module_init(sgi_buttons_init);
180module_exit(sgi_buttons_exit);
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/init.h>
21#include <linux/input-polldev.h>
22#include <linux/ioport.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26
27#ifdef CONFIG_SGI_IP22
28#include <asm/sgi/ioc.h>
29
30static inline u8 button_status(void)
31{
32 u8 status;
33
34 status = readb(&sgioc->panel) ^ 0xa0;
35 return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
36}
37#endif
38
39#ifdef CONFIG_SGI_IP32
40#include <asm/ip32/mace.h>
41
42static inline u8 button_status(void)
43{
44 u64 status;
45
46 status = readq(&mace->perif.audio.control);
47 writeq(status & ~(3U << 23), &mace->perif.audio.control);
48
49 return (status >> 23) & 3;
50}
51#endif
52
53#define BUTTONS_POLL_INTERVAL 30 /* msec */
54#define BUTTONS_COUNT_THRESHOLD 3
55
56static const unsigned short sgi_map[] = {
57 KEY_VOLUMEDOWN,
58 KEY_VOLUMEUP
59};
60
61struct buttons_dev {
62 struct input_polled_dev *poll_dev;
63 unsigned short keymap[ARRAY_SIZE(sgi_map)];
64 int count[ARRAY_SIZE(sgi_map)];
65};
66
67static void handle_buttons(struct input_polled_dev *dev)
68{
69 struct buttons_dev *bdev = dev->private;
70 struct input_dev *input = dev->input;
71 u8 status;
72 int i;
73
74 status = button_status();
75
76 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
77 if (status & (1U << i)) {
78 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
79 input_event(input, EV_MSC, MSC_SCAN, i);
80 input_report_key(input, bdev->keymap[i], 1);
81 input_sync(input);
82 }
83 } else {
84 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
85 input_event(input, EV_MSC, MSC_SCAN, i);
86 input_report_key(input, bdev->keymap[i], 0);
87 input_sync(input);
88 }
89 bdev->count[i] = 0;
90 }
91 }
92}
93
94static int __devinit sgi_buttons_probe(struct platform_device *pdev)
95{
96 struct buttons_dev *bdev;
97 struct input_polled_dev *poll_dev;
98 struct input_dev *input;
99 int error, i;
100
101 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
102 poll_dev = input_allocate_polled_device();
103 if (!bdev || !poll_dev) {
104 error = -ENOMEM;
105 goto err_free_mem;
106 }
107
108 memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
109
110 poll_dev->private = bdev;
111 poll_dev->poll = handle_buttons;
112 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
113
114 input = poll_dev->input;
115 input->name = "SGI buttons";
116 input->phys = "sgi/input0";
117 input->id.bustype = BUS_HOST;
118 input->dev.parent = &pdev->dev;
119
120 input->keycode = bdev->keymap;
121 input->keycodemax = ARRAY_SIZE(bdev->keymap);
122 input->keycodesize = sizeof(unsigned short);
123
124 input_set_capability(input, EV_MSC, MSC_SCAN);
125 __set_bit(EV_KEY, input->evbit);
126 for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
127 __set_bit(bdev->keymap[i], input->keybit);
128 __clear_bit(KEY_RESERVED, input->keybit);
129
130 bdev->poll_dev = poll_dev;
131 dev_set_drvdata(&pdev->dev, bdev);
132
133 error = input_register_polled_device(poll_dev);
134 if (error)
135 goto err_free_mem;
136
137 return 0;
138
139 err_free_mem:
140 input_free_polled_device(poll_dev);
141 kfree(bdev);
142 dev_set_drvdata(&pdev->dev, NULL);
143 return error;
144}
145
146static int __devexit sgi_buttons_remove(struct platform_device *pdev)
147{
148 struct device *dev = &pdev->dev;
149 struct buttons_dev *bdev = dev_get_drvdata(dev);
150
151 input_unregister_polled_device(bdev->poll_dev);
152 input_free_polled_device(bdev->poll_dev);
153 kfree(bdev);
154 dev_set_drvdata(dev, NULL);
155
156 return 0;
157}
158
159static struct platform_driver sgi_buttons_driver = {
160 .probe = sgi_buttons_probe,
161 .remove = __devexit_p(sgi_buttons_remove),
162 .driver = {
163 .name = "sgibtns",
164 .owner = THIS_MODULE,
165 },
166};
167module_platform_driver(sgi_buttons_driver);
168
169MODULE_LICENSE("GPL");