| 1 | |
| 2 | |
| 3 | * SGI Volume Button interface driver
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| 4 | *
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| 5 | * Copyright (C) 2008 Thomas Bogendoerfer <[email protected]>
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| 6 |
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| 7 | #include <linux/input.h>
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| 8 | #include <linux/ioport.h>
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| 9 | #include <linux/module.h>
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| 10 | #include <linux/platform_device.h>
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| 11 | #include <linux/slab.h>
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| 12 |
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| 13 | #ifdef CONFIG_SGI_IP22
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| 14 | #include <asm/sgi/ioc.h>
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| 15 |
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| 16 | static inline u8 button_status(void)
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| 17 | {
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| 18 | u8 status;
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| 19 |
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| 20 | status = readb(&sgioc->panel) ^ 0xa0;
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| 21 | return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
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| 22 | }
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| 23 | #endif
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| 24 |
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| 25 | #ifdef CONFIG_SGI_IP32
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| 26 | #include <asm/ip32/mace.h>
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| 27 |
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| 28 | static inline u8 button_status(void)
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| 29 | {
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| 30 | u64 status;
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| 31 |
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| 32 | status = readq(&mace->perif.audio.control);
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| 33 | writeq(status & ~(3U << 23), &mace->perif.audio.control);
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| 34 |
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| 35 | return (status >> 23) & 3;
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| 36 | }
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| 37 | #endif
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| 38 |
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| 39 | #define BUTTONS_POLL_INTERVAL 30
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| 40 | #define BUTTONS_COUNT_THRESHOLD 3
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| 41 |
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| 42 | static const unsigned short sgi_map[] = {
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| 43 | KEY_VOLUMEDOWN,
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| 44 | KEY_VOLUMEUP
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| 45 | };
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| 46 |
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| 47 | struct buttons_dev {
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| 48 | unsigned short keymap[ARRAY_SIZE(sgi_map)];
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| 49 | int count[ARRAY_SIZE(sgi_map)];
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| 50 | };
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| 51 |
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| 52 | static void handle_buttons(struct input_dev *input)
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| 53 | {
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| 54 | struct buttons_dev *bdev = input_get_drvdata(input);
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| 55 | u8 status;
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| 56 | int i;
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| 57 |
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| 58 | status = button_status();
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| 59 |
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| 60 | for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
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| 61 | if (status & (1U << i)) {
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| 62 | if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
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| 63 | input_event(input, EV_MSC, MSC_SCAN, i);
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| 64 | input_report_key(input, bdev->keymap[i], 1);
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| 65 | input_sync(input);
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| 66 | }
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| 67 | } else {
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| 68 | if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
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| 69 | input_event(input, EV_MSC, MSC_SCAN, i);
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| 70 | input_report_key(input, bdev->keymap[i], 0);
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| 71 | input_sync(input);
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| 72 | }
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| 73 | bdev->count[i] = 0;
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| 74 | }
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| 75 | }
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| 76 | }
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| 77 |
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| 78 | static int sgi_buttons_probe(struct platform_device *pdev)
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| 79 | {
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| 80 | struct buttons_dev *bdev;
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| 81 | struct input_dev *input;
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| 82 | int error, i;
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| 83 |
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| 84 | bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
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| 85 | if (!bdev)
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| 86 | return -ENOMEM;
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| 87 |
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| 88 | input = devm_input_allocate_device(&pdev->dev);
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| 89 | if (!input)
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| 90 | return -ENOMEM;
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| 91 |
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| 92 | memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
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| 93 |
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| 94 | input_set_drvdata(input, bdev);
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| 95 |
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| 96 | input->name = "SGI buttons";
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| 97 | input->phys = "sgi/input0";
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| 98 | input->id.bustype = BUS_HOST;
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| 99 |
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| 100 | input->keycode = bdev->keymap;
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| 101 | input->keycodemax = ARRAY_SIZE(bdev->keymap);
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| 102 | input->keycodesize = sizeof(unsigned short);
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| 103 |
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| 104 | input_set_capability(input, EV_MSC, MSC_SCAN);
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| 105 | __set_bit(EV_KEY, input->evbit);
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| 106 | for (i = 0; i < ARRAY_SIZE(sgi_map); i++)
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| 107 | __set_bit(bdev->keymap[i], input->keybit);
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| 108 | __clear_bit(KEY_RESERVED, input->keybit);
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| 109 |
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| 110 | error = input_setup_polling(input, handle_buttons);
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| 111 | if (error)
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| 112 | return error;
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| 113 |
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| 114 | input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
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| 115 |
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| 116 | error = input_register_device(input);
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| 117 | if (error)
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| 118 | return error;
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| 119 |
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| 120 | return 0;
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| 121 | }
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| 122 |
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| 123 | static struct platform_driver sgi_buttons_driver = {
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| 124 | .probe = sgi_buttons_probe,
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| 125 | .driver = {
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| 126 | .name = "sgibtns",
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| 127 | },
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| 128 | };
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| 129 | module_platform_driver(sgi_buttons_driver);
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| 130 |
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| 131 | MODULE_DESCRIPTION("SGI Indy/O2 volume button interface driver");
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| 132 | MODULE_LICENSE("GPL");
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