Memoryless nodes: Uncached allocator updates
[linux-2.6] / drivers / input / misc / cobalt_btns.c
1 /*
2  *  Cobalt button interface driver.
3  *
4  *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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 #define BUTTONS_POLL_INTERVAL   30      /* msec */
27 #define BUTTONS_COUNT_THRESHOLD 3
28 #define BUTTONS_STATUS_MASK     0xfe000000
29
30 struct buttons_dev {
31         struct input_polled_dev *poll_dev;
32         void __iomem *reg;
33 };
34
35 struct buttons_map {
36         uint32_t mask;
37         int keycode;
38         int count;
39 };
40
41 static struct buttons_map buttons_map[] = {
42         { 0x02000000, KEY_RESTART, },
43         { 0x04000000, KEY_LEFT, },
44         { 0x08000000, KEY_UP, },
45         { 0x10000000, KEY_DOWN, },
46         { 0x20000000, KEY_RIGHT, },
47         { 0x40000000, KEY_ENTER, },
48         { 0x80000000, KEY_SELECT, },
49 };
50
51 static void handle_buttons(struct input_polled_dev *dev)
52 {
53         struct buttons_map *button = buttons_map;
54         struct buttons_dev *bdev = dev->private;
55         struct input_dev *input = dev->input;
56         uint32_t status;
57         int i;
58
59         status = readl(bdev->reg);
60         status = ~status & BUTTONS_STATUS_MASK;
61
62         for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
63                 if (status & button->mask) {
64                         button->count++;
65                 } else {
66                         if (button->count >= BUTTONS_COUNT_THRESHOLD) {
67                                 input_report_key(input, button->keycode, 0);
68                                 input_sync(input);
69                         }
70                         button->count = 0;
71                 }
72
73                 if (button->count == BUTTONS_COUNT_THRESHOLD) {
74                         input_report_key(input, button->keycode, 1);
75                         input_sync(input);
76                 }
77
78                 button++;
79         }
80 }
81
82 static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
83 {
84         struct buttons_dev *bdev;
85         struct input_polled_dev *poll_dev;
86         struct input_dev *input;
87         struct resource *res;
88         int error, i;
89
90         bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
91         poll_dev = input_allocate_polled_device();
92         if (!bdev || !poll_dev) {
93                 error = -ENOMEM;
94                 goto err_free_mem;
95         }
96
97         poll_dev->private = bdev;
98         poll_dev->poll = handle_buttons;
99         poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
100
101         input = poll_dev->input;
102         input->name = "Cobalt buttons";
103         input->phys = "cobalt/input0";
104         input->id.bustype = BUS_HOST;
105         input->cdev.dev = &pdev->dev;
106
107         input->evbit[0] = BIT(EV_KEY);
108         for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
109                 set_bit(buttons_map[i].keycode, input->keybit);
110                 buttons_map[i].count = 0;
111         }
112
113         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
114         if (!res) {
115                 error = -EBUSY;
116                 goto err_free_mem;
117         }
118
119         bdev->poll_dev = poll_dev;
120         bdev->reg = ioremap(res->start, res->end - res->start + 1);
121         dev_set_drvdata(&pdev->dev, bdev);
122
123         error = input_register_polled_device(poll_dev);
124         if (error)
125                 goto err_iounmap;
126
127         return 0;
128
129  err_iounmap:
130         iounmap(bdev->reg);
131  err_free_mem:
132         input_free_polled_device(poll_dev);
133         kfree(bdev);
134         dev_set_drvdata(&pdev->dev, NULL);
135         return error;
136 }
137
138 static int __devexit cobalt_buttons_remove(struct platform_device *pdev)
139 {
140         struct device *dev = &pdev->dev;
141         struct buttons_dev *bdev = dev_get_drvdata(dev);
142
143         input_unregister_polled_device(bdev->poll_dev);
144         input_free_polled_device(bdev->poll_dev);
145         iounmap(bdev->reg);
146         kfree(bdev);
147         dev_set_drvdata(dev, NULL);
148
149         return 0;
150 }
151
152 static struct platform_driver cobalt_buttons_driver = {
153         .probe  = cobalt_buttons_probe,
154         .remove = __devexit_p(cobalt_buttons_remove),
155         .driver = {
156                 .name   = "Cobalt buttons",
157                 .owner  = THIS_MODULE,
158         },
159 };
160
161 static int __init cobalt_buttons_init(void)
162 {
163         return platform_driver_register(&cobalt_buttons_driver);
164 }
165
166 static void __exit cobalt_buttons_exit(void)
167 {
168         platform_driver_unregister(&cobalt_buttons_driver);
169 }
170
171 module_init(cobalt_buttons_init);
172 module_exit(cobalt_buttons_exit);