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
26 #define BUTTONS_POLL_INTERVAL 30 /* msec */
27 #define BUTTONS_COUNT_THRESHOLD 3
28 #define BUTTONS_STATUS_MASK 0xfe000000
29
30 static const unsigned short cobalt_map[] = {
31 KEY_RESERVED,
32 KEY_RESTART,
33 KEY_LEFT,
34 KEY_UP,
35 KEY_DOWN,
36 KEY_RIGHT,
37 KEY_ENTER,
38 KEY_SELECT
39 };
40
41 struct buttons_dev {
42 struct input_polled_dev *poll_dev;
43 unsigned short keymap[ARRAY_SIZE(cobalt_map)];
44 int count[ARRAY_SIZE(cobalt_map)];
45 void __iomem *reg;
46 };
47
48 static void handle_buttons(struct input_polled_dev *dev)
49 {
50 struct buttons_dev *bdev = dev->private;
51 struct input_dev *input = dev->input;
52 uint32_t status;
53 int i;
54
55 status = ~readl(bdev->reg) >> 24;
56
57 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
58 if (status & (1U << i)) {
59 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
60 input_event(input, EV_MSC, MSC_SCAN, i);
61 input_report_key(input, bdev->keymap[i], 1);
62 input_sync(input);
63 }
64 } else {
65 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
66 input_event(input, EV_MSC, MSC_SCAN, i);
67 input_report_key(input, bdev->keymap[i], 0);
68 input_sync(input);
69 }
70 bdev->count[i] = 0;
71 }
72 }
73 }
74
75 static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
76 {
77 struct buttons_dev *bdev;
78 struct input_polled_dev *poll_dev;
79 struct input_dev *input;
80 struct resource *res;
81 int error, i;
82
83 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
84 poll_dev = input_allocate_polled_device();
85 if (!bdev || !poll_dev) {
86 error = -ENOMEM;
87 goto err_free_mem;
88 }
89
90 memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
91
92 poll_dev->private = bdev;
93 poll_dev->poll = handle_buttons;
94 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
95
96 input = poll_dev->input;
97 input->name = "Cobalt buttons";
98 input->phys = "cobalt/input0";
99 input->id.bustype = BUS_HOST;
100 input->dev.parent = &pdev->dev;
101
102 input->keycode = bdev->keymap;
103 input->keycodemax = ARRAY_SIZE(bdev->keymap);
104 input->keycodesize = sizeof(unsigned short);
105
106 input_set_capability(input, EV_MSC, MSC_SCAN);
107 __set_bit(EV_KEY, input->evbit);
108 for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
109 __set_bit(bdev->keymap[i], input->keybit);
110 __clear_bit(KEY_RESERVED, input->keybit);
111
112 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
113 if (!res) {
114 error = -EBUSY;
115 goto err_free_mem;
116 }
117
118 bdev->poll_dev = poll_dev;
119 bdev->reg = ioremap(res->start, res->end - res->start + 1);
120 dev_set_drvdata(&pdev->dev, bdev);
121
122 error = input_register_polled_device(poll_dev);
123 if (error)
124 goto err_iounmap;
125
126 return 0;
127
128 err_iounmap:
129 iounmap(bdev->reg);
130 err_free_mem:
131 input_free_polled_device(poll_dev);
132 kfree(bdev);
133 dev_set_drvdata(&pdev->dev, NULL);
134 return error;
135 }
136
137 static int __devexit cobalt_buttons_remove(struct platform_device *pdev)
138 {
139 struct device *dev = &pdev->dev;
140 struct buttons_dev *bdev = dev_get_drvdata(dev);
141
142 input_unregister_polled_device(bdev->poll_dev);
143 input_free_polled_device(bdev->poll_dev);
144 iounmap(bdev->reg);
145 kfree(bdev);
146 dev_set_drvdata(dev, NULL);
147
148 return 0;
149 }
150
151 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
152 MODULE_DESCRIPTION("Cobalt button interface driver");
153 MODULE_LICENSE("GPL");
154 /* work with hotplug and coldplug */
155 MODULE_ALIAS("platform:Cobalt buttons");
156
157 static struct platform_driver cobalt_buttons_driver = {
158 .probe = cobalt_buttons_probe,
159 .remove = __devexit_p(cobalt_buttons_remove),
160 .driver = {
161 .name = "Cobalt buttons",
162 .owner = THIS_MODULE,
163 },
164 };
165
166 static int __init cobalt_buttons_init(void)
167 {
168 return platform_driver_register(&cobalt_buttons_driver);
169 }
170
171 static void __exit cobalt_buttons_exit(void)
172 {
173 platform_driver_unregister(&cobalt_buttons_driver);
174 }
175
176 module_init(cobalt_buttons_init);
177 module_exit(cobalt_buttons_exit);
178
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