include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / drivers / input / misc / cobalt_btns.c
1 /*
2  *  Cobalt button interface driver.
3  *
4  *  Copyright (C) 2007-2008  Yoichi Yuasa <yuasa@linux-mips.org>
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 #define BUTTONS_POLL_INTERVAL   30      /* msec */
28 #define BUTTONS_COUNT_THRESHOLD 3
29 #define BUTTONS_STATUS_MASK     0xfe000000
30
31 static const unsigned short cobalt_map[] = {
32         KEY_RESERVED,
33         KEY_RESTART,
34         KEY_LEFT,
35         KEY_UP,
36         KEY_DOWN,
37         KEY_RIGHT,
38         KEY_ENTER,
39         KEY_SELECT
40 };
41
42 struct buttons_dev {
43         struct input_polled_dev *poll_dev;
44         unsigned short keymap[ARRAY_SIZE(cobalt_map)];
45         int count[ARRAY_SIZE(cobalt_map)];
46         void __iomem *reg;
47 };
48
49 static void handle_buttons(struct input_polled_dev *dev)
50 {
51         struct buttons_dev *bdev = dev->private;
52         struct input_dev *input = dev->input;
53         uint32_t status;
54         int i;
55
56         status = ~readl(bdev->reg) >> 24;
57
58         for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
59                 if (status & (1U << i)) {
60                         if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
61                                 input_event(input, EV_MSC, MSC_SCAN, i);
62                                 input_report_key(input, bdev->keymap[i], 1);
63                                 input_sync(input);
64                         }
65                 } else {
66                         if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
67                                 input_event(input, EV_MSC, MSC_SCAN, i);
68                                 input_report_key(input, bdev->keymap[i], 0);
69                                 input_sync(input);
70                         }
71                         bdev->count[i] = 0;
72                 }
73         }
74 }
75
76 static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
77 {
78         struct buttons_dev *bdev;
79         struct input_polled_dev *poll_dev;
80         struct input_dev *input;
81         struct resource *res;
82         int error, i;
83
84         bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
85         poll_dev = input_allocate_polled_device();
86         if (!bdev || !poll_dev) {
87                 error = -ENOMEM;
88                 goto err_free_mem;
89         }
90
91         memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
92
93         poll_dev->private = bdev;
94         poll_dev->poll = handle_buttons;
95         poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
96
97         input = poll_dev->input;
98         input->name = "Cobalt buttons";
99         input->phys = "cobalt/input0";
100         input->id.bustype = BUS_HOST;
101         input->dev.parent = &pdev->dev;
102
103         input->keycode = bdev->keymap;
104         input->keycodemax = ARRAY_SIZE(bdev->keymap);
105         input->keycodesize = sizeof(unsigned short);
106
107         input_set_capability(input, EV_MSC, MSC_SCAN);
108         __set_bit(EV_KEY, input->evbit);
109         for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
110                 __set_bit(bdev->keymap[i], input->keybit);
111         __clear_bit(KEY_RESERVED, input->keybit);
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, resource_size(res));
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 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
153 MODULE_DESCRIPTION("Cobalt button interface driver");
154 MODULE_LICENSE("GPL");
155 /* work with hotplug and coldplug */
156 MODULE_ALIAS("platform:Cobalt buttons");
157
158 static struct platform_driver cobalt_buttons_driver = {
159         .probe  = cobalt_buttons_probe,
160         .remove = __devexit_p(cobalt_buttons_remove),
161         .driver = {
162                 .name   = "Cobalt buttons",
163                 .owner  = THIS_MODULE,
164         },
165 };
166
167 static int __init cobalt_buttons_init(void)
168 {
169         return platform_driver_register(&cobalt_buttons_driver);
170 }
171
172 static void __exit cobalt_buttons_exit(void)
173 {
174         platform_driver_unregister(&cobalt_buttons_driver);
175 }
176
177 module_init(cobalt_buttons_init);
178 module_exit(cobalt_buttons_exit);