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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
28#define BUTTONS_COUNT_THRESHOLD 3
29#define BUTTONS_STATUS_MASK 0xfe000000
30
31static 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
42struct 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
49static 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
76static 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
138static 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
152MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
153MODULE_DESCRIPTION("Cobalt button interface driver");
154MODULE_LICENSE("GPL");
155
156MODULE_ALIAS("platform:Cobalt buttons");
157
158static 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
167static int __init cobalt_buttons_init(void)
168{
169 return platform_driver_register(&cobalt_buttons_driver);
170}
171
172static void __exit cobalt_buttons_exit(void)
173{
174 platform_driver_unregister(&cobalt_buttons_driver);
175}
176
177module_init(cobalt_buttons_init);
178module_exit(cobalt_buttons_exit);
179
