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authorThomas Bogendoerfer <tsbogend@alpha.franken.de>2008-07-07 09:07:31 -0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2008-07-07 09:08:07 -0400
commit3bee2a04cf14f599e094a37445f2eb4e6bb316bc (patch)
tree4f89e4915ced3cd3fa89f218ac220dc248490062 /drivers
parentb4ecda3e965a87881a94017cb0cd484d65799261 (diff)
Input: new driver for SGI O2 volume buttons
This driver adds support for the volume buttons on the front of every SGI O2 workstation. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/misc/Kconfig10
-rw-r--r--drivers/input/misc/Makefile1
-rw-r--r--drivers/input/misc/sgio2_btns.c156
3 files changed, 167 insertions, 0 deletions
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 432699d61c58..e33d7cbcb1df 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -189,6 +189,16 @@ config INPUT_UINPUT
189 To compile this driver as a module, choose M here: the 189 To compile this driver as a module, choose M here: the
190 module will be called uinput. 190 module will be called uinput.
191 191
192config INPUT_SGIO2_BTNS
193 tristate "SGI O2 volume button interface"
194 depends on SGI_IP32
195 select INPUT_POLLDEV
196 help
197 Say Y here if you want to support SGI O2 volume button interface.
198
199 To compile this driver as a module, choose M here: the
200 module will be called sgio_btns.
201
192config HP_SDC_RTC 202config HP_SDC_RTC
193 tristate "HP SDC Real Time Clock" 203 tristate "HP SDC Real Time Clock"
194 depends on GSC || HP300 204 depends on GSC || HP300
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index ebd39f291d25..0e274f19bcb3 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_INPUT_YEALINK) += yealink.o
19obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o 19obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
20obj-$(CONFIG_INPUT_UINPUT) += uinput.o 20obj-$(CONFIG_INPUT_UINPUT) += uinput.o
21obj-$(CONFIG_INPUT_APANEL) += apanel.o 21obj-$(CONFIG_INPUT_APANEL) += apanel.o
22obj-$(CONFIG_INPUT_SGIO2_BTNS) += sgio2_btns.o
diff --git a/drivers/input/misc/sgio2_btns.c b/drivers/input/misc/sgio2_btns.c
new file mode 100644
index 000000000000..b1ab43d903dd
--- /dev/null
+++ b/drivers/input/misc/sgio2_btns.c
@@ -0,0 +1,156 @@
1/*
2 * SGI O2 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
26#include <asm/ip32/mace.h>
27
28#define BUTTONS_POLL_INTERVAL 30 /* msec */
29#define BUTTONS_COUNT_THRESHOLD 3
30
31static const unsigned short sgio2_map[] = {
32 KEY_VOLUMEUP,
33 KEY_VOLUMEDOWN
34};
35
36struct buttons_dev {
37 struct input_polled_dev *poll_dev;
38 unsigned short keymap[ARRAY_SIZE(sgio2_map)];
39 int count[ARRAY_SIZE(sgio2_map)];
40 void __iomem *reg;
41};
42
43static void handle_buttons(struct input_polled_dev *dev)
44{
45 struct buttons_dev *bdev = dev->private;
46 struct input_dev *input = dev->input;
47 u64 status;
48 int i;
49
50 status = (readq(&mace->perif.audio.control) >> 23) & 3;
51
52 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
53 if (status & (1U << i)) {
54 writeq(status & ~(1U << i), &mace->perif.audio.control);
55 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
56 input_event(input, EV_MSC, MSC_SCAN, i);
57 input_report_key(input, bdev->keymap[i], 1);
58 input_sync(input);
59 }
60 } else {
61 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
62 input_event(input, EV_MSC, MSC_SCAN, i);
63 input_report_key(input, bdev->keymap[i], 0);
64 input_sync(input);
65 }
66 bdev->count[i] = 0;
67 }
68 }
69}
70
71static int __devinit sgio2_buttons_probe(struct platform_device *pdev)
72{
73 struct buttons_dev *bdev;
74 struct input_polled_dev *poll_dev;
75 struct input_dev *input;
76 int error, i;
77
78 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
79 poll_dev = input_allocate_polled_device();
80 if (!bdev || !poll_dev) {
81 error = -ENOMEM;
82 goto err_free_mem;
83 }
84
85 memcpy(bdev->keymap, sgio2_map, sizeof(bdev->keymap));
86
87 poll_dev->private = bdev;
88 poll_dev->poll = handle_buttons;
89 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
90
91 input = poll_dev->input;
92 input->name = "SGI O2 buttons";
93 input->phys = "sgio2/input0";
94 input->id.bustype = BUS_HOST;
95 input->dev.parent = &pdev->dev;
96
97 input->keycode = bdev->keymap;
98 input->keycodemax = ARRAY_SIZE(bdev->keymap);
99 input->keycodesize = sizeof(unsigned short);
100
101 input_set_capability(input, EV_MSC, MSC_SCAN);
102 __set_bit(EV_KEY, input->evbit);
103 for (i = 0; i < ARRAY_SIZE(sgio2_map); i++)
104 __set_bit(bdev->keymap[i], input->keybit);
105 __clear_bit(KEY_RESERVED, input->keybit);
106
107 bdev->poll_dev = poll_dev;
108 dev_set_drvdata(&pdev->dev, bdev);
109
110 error = input_register_polled_device(poll_dev);
111 if (error)
112 goto err_free_mem;
113
114 return 0;
115
116 err_free_mem:
117 input_free_polled_device(poll_dev);
118 kfree(bdev);
119 dev_set_drvdata(&pdev->dev, NULL);
120 return error;
121}
122
123static int __devexit sgio2_buttons_remove(struct platform_device *pdev)
124{
125 struct device *dev = &pdev->dev;
126 struct buttons_dev *bdev = dev_get_drvdata(dev);
127
128 input_unregister_polled_device(bdev->poll_dev);
129 input_free_polled_device(bdev->poll_dev);
130 kfree(bdev);
131 dev_set_drvdata(dev, NULL);
132
133 return 0;
134}
135
136static struct platform_driver sgio2_buttons_driver = {
137 .probe = sgio2_buttons_probe,
138 .remove = __devexit_p(sgio2_buttons_remove),
139 .driver = {
140 .name = "sgio2btns",
141 .owner = THIS_MODULE,
142 },
143};
144
145static int __init sgio2_buttons_init(void)
146{
147 return platform_driver_register(&sgio2_buttons_driver);
148}
149
150static void __exit sgio2_buttons_exit(void)
151{
152 platform_driver_unregister(&sgio2_buttons_driver);
153}
154
155module_init(sgio2_buttons_init);
156module_exit(sgio2_buttons_exit);