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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 | |
30 | static 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 | |
42 | static 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 | |
56 | static const unsigned short sgi_map[] = { |
57 | KEY_VOLUMEDOWN, |
58 | KEY_VOLUMEUP |
59 | }; |
60 | |
61 | struct 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 | |
67 | static 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 | |
94 | static int 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 | |
146 | static int 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 | |
159 | static struct platform_driver sgi_buttons_driver = { |
160 | .probe = sgi_buttons_probe, |
161 | .remove = sgi_buttons_remove, |
162 | .driver = { |
163 | .name = "sgibtns", |
164 | .owner = THIS_MODULE, |
165 | }, |
166 | }; |
167 | module_platform_driver(sgi_buttons_driver); |
168 | |
169 | MODULE_LICENSE("GPL"); |
170 |
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