This source file includes following definitions.
- handle_buttons
- cobalt_buttons_probe
- cobalt_buttons_remove
1
2
3
4
5
6
7 #include <linux/input-polldev.h>
8 #include <linux/ioport.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/slab.h>
12
13 #define BUTTONS_POLL_INTERVAL 30
14 #define BUTTONS_COUNT_THRESHOLD 3
15 #define BUTTONS_STATUS_MASK 0xfe000000
16
17 static const unsigned short cobalt_map[] = {
18 KEY_RESERVED,
19 KEY_RESTART,
20 KEY_LEFT,
21 KEY_UP,
22 KEY_DOWN,
23 KEY_RIGHT,
24 KEY_ENTER,
25 KEY_SELECT
26 };
27
28 struct buttons_dev {
29 struct input_polled_dev *poll_dev;
30 unsigned short keymap[ARRAY_SIZE(cobalt_map)];
31 int count[ARRAY_SIZE(cobalt_map)];
32 void __iomem *reg;
33 };
34
35 static void handle_buttons(struct input_polled_dev *dev)
36 {
37 struct buttons_dev *bdev = dev->private;
38 struct input_dev *input = dev->input;
39 uint32_t status;
40 int i;
41
42 status = ~readl(bdev->reg) >> 24;
43
44 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
45 if (status & (1U << i)) {
46 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
47 input_event(input, EV_MSC, MSC_SCAN, i);
48 input_report_key(input, bdev->keymap[i], 1);
49 input_sync(input);
50 }
51 } else {
52 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
53 input_event(input, EV_MSC, MSC_SCAN, i);
54 input_report_key(input, bdev->keymap[i], 0);
55 input_sync(input);
56 }
57 bdev->count[i] = 0;
58 }
59 }
60 }
61
62 static int cobalt_buttons_probe(struct platform_device *pdev)
63 {
64 struct buttons_dev *bdev;
65 struct input_polled_dev *poll_dev;
66 struct input_dev *input;
67 struct resource *res;
68 int error, i;
69
70 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
71 poll_dev = input_allocate_polled_device();
72 if (!bdev || !poll_dev) {
73 error = -ENOMEM;
74 goto err_free_mem;
75 }
76
77 memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
78
79 poll_dev->private = bdev;
80 poll_dev->poll = handle_buttons;
81 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
82
83 input = poll_dev->input;
84 input->name = "Cobalt buttons";
85 input->phys = "cobalt/input0";
86 input->id.bustype = BUS_HOST;
87 input->dev.parent = &pdev->dev;
88
89 input->keycode = bdev->keymap;
90 input->keycodemax = ARRAY_SIZE(bdev->keymap);
91 input->keycodesize = sizeof(unsigned short);
92
93 input_set_capability(input, EV_MSC, MSC_SCAN);
94 __set_bit(EV_KEY, input->evbit);
95 for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
96 __set_bit(bdev->keymap[i], input->keybit);
97 __clear_bit(KEY_RESERVED, input->keybit);
98
99 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
100 if (!res) {
101 error = -EBUSY;
102 goto err_free_mem;
103 }
104
105 bdev->poll_dev = poll_dev;
106 bdev->reg = ioremap(res->start, resource_size(res));
107 dev_set_drvdata(&pdev->dev, bdev);
108
109 error = input_register_polled_device(poll_dev);
110 if (error)
111 goto err_iounmap;
112
113 return 0;
114
115 err_iounmap:
116 iounmap(bdev->reg);
117 err_free_mem:
118 input_free_polled_device(poll_dev);
119 kfree(bdev);
120 return error;
121 }
122
123 static int cobalt_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 iounmap(bdev->reg);
131 kfree(bdev);
132
133 return 0;
134 }
135
136 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
137 MODULE_DESCRIPTION("Cobalt button interface driver");
138 MODULE_LICENSE("GPL");
139
140 MODULE_ALIAS("platform:Cobalt buttons");
141
142 static struct platform_driver cobalt_buttons_driver = {
143 .probe = cobalt_buttons_probe,
144 .remove = cobalt_buttons_remove,
145 .driver = {
146 .name = "Cobalt buttons",
147 },
148 };
149 module_platform_driver(cobalt_buttons_driver);