| 1 | |
| 2 | |
| 3 | * Cobalt button interface driver.
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| 4 | *
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| 5 | * Copyright (C) 2007-2008 Yoichi Yuasa <[email protected]>
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| 6 |
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| 7 | #include <linux/input.h>
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| 8 | #include <linux/io.h>
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| 9 | #include <linux/ioport.h>
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| 10 | #include <linux/module.h>
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| 11 | #include <linux/platform_device.h>
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| 12 | #include <linux/slab.h>
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| 13 |
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| 14 | #define BUTTONS_POLL_INTERVAL 30
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| 15 | #define BUTTONS_COUNT_THRESHOLD 3
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| 16 | #define BUTTONS_STATUS_MASK 0xfe000000
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| 17 |
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| 18 | static const unsigned short cobalt_map[] = {
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| 19 | KEY_RESERVED,
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| 20 | KEY_RESTART,
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| 21 | KEY_LEFT,
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| 22 | KEY_UP,
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| 23 | KEY_DOWN,
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| 24 | KEY_RIGHT,
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| 25 | KEY_ENTER,
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| 26 | KEY_SELECT
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| 27 | };
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| 28 |
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| 29 | struct buttons_dev {
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| 30 | unsigned short keymap[ARRAY_SIZE(cobalt_map)];
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| 31 | int count[ARRAY_SIZE(cobalt_map)];
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| 32 | void __iomem *reg;
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| 33 | };
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| 34 |
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| 35 | static void handle_buttons(struct input_dev *input)
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| 36 | {
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| 37 | struct buttons_dev *bdev = input_get_drvdata(input);
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| 38 | uint32_t status;
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| 39 | int i;
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| 40 |
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| 41 | status = ~readl(bdev->reg) >> 24;
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| 42 |
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| 43 | for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
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| 44 | if (status & (1U << i)) {
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| 45 | if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
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| 46 | input_event(input, EV_MSC, MSC_SCAN, i);
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| 47 | input_report_key(input, bdev->keymap[i], 1);
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| 48 | input_sync(input);
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| 49 | }
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| 50 | } else {
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| 51 | if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
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| 52 | input_event(input, EV_MSC, MSC_SCAN, i);
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| 53 | input_report_key(input, bdev->keymap[i], 0);
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| 54 | input_sync(input);
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| 55 | }
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| 56 | bdev->count[i] = 0;
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| 57 | }
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | static int cobalt_buttons_probe(struct platform_device *pdev)
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| 62 | {
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| 63 | struct buttons_dev *bdev;
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| 64 | struct input_dev *input;
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| 65 | struct resource *res;
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| 66 | int error, i;
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| 67 |
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| 68 | bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
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| 69 | if (!bdev)
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| 70 | return -ENOMEM;
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| 71 |
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| 72 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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| 73 | if (!res)
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| 74 | return -EBUSY;
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| 75 |
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| 76 | bdev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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| 77 | if (!bdev->reg)
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| 78 | return -ENOMEM;
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| 79 |
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| 80 | memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
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| 81 |
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| 82 | input = devm_input_allocate_device(&pdev->dev);
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| 83 | if (!input)
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| 84 | return -ENOMEM;
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| 85 |
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| 86 | input_set_drvdata(input, bdev);
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| 87 |
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| 88 | input->name = "Cobalt buttons";
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| 89 | input->phys = "cobalt/input0";
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| 90 | input->id.bustype = BUS_HOST;
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| 91 |
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| 92 | input->keycode = bdev->keymap;
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| 93 | input->keycodemax = ARRAY_SIZE(bdev->keymap);
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| 94 | input->keycodesize = sizeof(unsigned short);
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| 95 |
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| 96 | input_set_capability(input, EV_MSC, MSC_SCAN);
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| 97 | __set_bit(EV_KEY, input->evbit);
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| 98 | for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
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| 99 | __set_bit(bdev->keymap[i], input->keybit);
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| 100 | __clear_bit(KEY_RESERVED, input->keybit);
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| 101 |
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| 102 |
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| 103 | error = input_setup_polling(input, handle_buttons);
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| 104 | if (error)
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| 105 | return error;
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| 106 |
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| 107 | input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
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| 108 |
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| 109 | error = input_register_device(input);
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| 110 | if (error)
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| 111 | return error;
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| 112 |
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| 113 | return 0;
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| 114 | }
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| 115 |
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| 116 | MODULE_AUTHOR("Yoichi Yuasa <[email protected]>");
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| 117 | MODULE_DESCRIPTION("Cobalt button interface driver");
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| 118 | MODULE_LICENSE("GPL");
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| 119 |
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| 120 | MODULE_ALIAS("platform:Cobalt buttons");
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| 121 |
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| 122 | static struct platform_driver cobalt_buttons_driver = {
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| 123 | .probe = cobalt_buttons_probe,
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| 124 | .driver = {
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| 125 | .name = "Cobalt buttons",
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| 126 | },
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| 127 | };
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| 128 | module_platform_driver(cobalt_buttons_driver);
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