Commit | Line | Data |
---|---|---|
3bee2a04 | 1 | /* |
48ad88b1 | 2 | * SGI Volume Button interface driver |
3bee2a04 TB |
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 | */ | |
3bee2a04 TB |
20 | #include <linux/input-polldev.h> |
21 | #include <linux/ioport.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
3bee2a04 | 25 | |
48ad88b1 TB |
26 | #ifdef CONFIG_SGI_IP22 |
27 | #include <asm/sgi/ioc.h> | |
28 | ||
29 | static 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 | |
3bee2a04 TB |
39 | #include <asm/ip32/mace.h> |
40 | ||
48ad88b1 TB |
41 | static 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 | ||
3bee2a04 TB |
52 | #define BUTTONS_POLL_INTERVAL 30 /* msec */ |
53 | #define BUTTONS_COUNT_THRESHOLD 3 | |
54 | ||
48ad88b1 TB |
55 | static const unsigned short sgi_map[] = { |
56 | KEY_VOLUMEDOWN, | |
57 | KEY_VOLUMEUP | |
3bee2a04 TB |
58 | }; |
59 | ||
60 | struct buttons_dev { | |
61 | struct input_polled_dev *poll_dev; | |
48ad88b1 TB |
62 | unsigned short keymap[ARRAY_SIZE(sgi_map)]; |
63 | int count[ARRAY_SIZE(sgi_map)]; | |
3bee2a04 TB |
64 | }; |
65 | ||
66 | static void handle_buttons(struct input_polled_dev *dev) | |
67 | { | |
68 | struct buttons_dev *bdev = dev->private; | |
69 | struct input_dev *input = dev->input; | |
48ad88b1 | 70 | u8 status; |
3bee2a04 TB |
71 | int i; |
72 | ||
48ad88b1 | 73 | status = button_status(); |
3bee2a04 TB |
74 | |
75 | for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { | |
76 | if (status & (1U << i)) { | |
3bee2a04 TB |
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 | ||
5298cc4c | 93 | static int sgi_buttons_probe(struct platform_device *pdev) |
3bee2a04 TB |
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 | ||
48ad88b1 | 107 | memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap)); |
3bee2a04 TB |
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; | |
48ad88b1 TB |
114 | input->name = "SGI buttons"; |
115 | input->phys = "sgi/input0"; | |
3bee2a04 TB |
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); | |
48ad88b1 | 125 | for (i = 0; i < ARRAY_SIZE(sgi_map); i++) |
3bee2a04 TB |
126 | __set_bit(bdev->keymap[i], input->keybit); |
127 | __clear_bit(KEY_RESERVED, input->keybit); | |
128 | ||
129 | bdev->poll_dev = poll_dev; | |
35c4b122 | 130 | platform_set_drvdata(pdev, bdev); |
3bee2a04 TB |
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); | |
3bee2a04 TB |
141 | return error; |
142 | } | |
143 | ||
e2619cf7 | 144 | static int sgi_buttons_remove(struct platform_device *pdev) |
3bee2a04 | 145 | { |
35c4b122 | 146 | struct buttons_dev *bdev = platform_get_drvdata(pdev); |
3bee2a04 TB |
147 | |
148 | input_unregister_polled_device(bdev->poll_dev); | |
149 | input_free_polled_device(bdev->poll_dev); | |
150 | kfree(bdev); | |
3bee2a04 TB |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
48ad88b1 TB |
155 | static struct platform_driver sgi_buttons_driver = { |
156 | .probe = sgi_buttons_probe, | |
1cb0aa88 | 157 | .remove = sgi_buttons_remove, |
3bee2a04 | 158 | .driver = { |
48ad88b1 | 159 | .name = "sgibtns", |
3bee2a04 TB |
160 | }, |
161 | }; | |
840a746b | 162 | module_platform_driver(sgi_buttons_driver); |
3bee2a04 | 163 | |
4c2bdcdc | 164 | MODULE_LICENSE("GPL"); |