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| 2 | |
| 3 | * Generic GPIO beeper driver
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| 4 | *
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| 5 | * Copyright (C) 2013-2014 Alexander Shiyan <[email protected]>
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| 6 |
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| 7 |
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| 8 | #include <linux/input.h>
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| 9 | #include <linux/module.h>
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| 10 | #include <linux/gpio/consumer.h>
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| 11 | #include <linux/of.h>
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| 12 | #include <linux/workqueue.h>
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| 13 | #include <linux/platform_device.h>
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| 14 |
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| 15 | #define BEEPER_MODNAME "gpio-beeper"
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| 16 |
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| 17 | struct gpio_beeper {
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| 18 | struct work_struct work;
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| 19 | struct gpio_desc *desc;
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| 20 | bool beeping;
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| 21 | };
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| 22 |
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| 23 | static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
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| 24 | {
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| 25 | gpiod_set_value_cansleep(beep->desc, on);
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| 26 | }
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| 27 |
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| 28 | static void gpio_beeper_work(struct work_struct *work)
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| 29 | {
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| 30 | struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
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| 31 |
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| 32 | gpio_beeper_toggle(beep, beep->beeping);
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| 33 | }
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| 34 |
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| 35 | static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
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| 36 | unsigned int code, int value)
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| 37 | {
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| 38 | struct gpio_beeper *beep = input_get_drvdata(dev);
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| 39 |
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| 40 | if (type != EV_SND || code != SND_BELL)
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| 41 | return -ENOTSUPP;
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| 42 |
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| 43 | if (value < 0)
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| 44 | return -EINVAL;
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| 45 |
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| 46 | beep->beeping = value;
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| 47 |
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| 48 | schedule_work(&beep->work);
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| 49 |
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| 50 | return 0;
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| 51 | }
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| 52 |
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| 53 | static void gpio_beeper_close(struct input_dev *input)
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| 54 | {
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| 55 | struct gpio_beeper *beep = input_get_drvdata(input);
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| 56 |
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| 57 | cancel_work_sync(&beep->work);
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| 58 | gpio_beeper_toggle(beep, false);
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| 59 | }
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| 60 |
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| 61 | static int gpio_beeper_probe(struct platform_device *pdev)
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| 62 | {
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| 63 | struct gpio_beeper *beep;
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| 64 | struct input_dev *input;
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| 65 |
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| 66 | beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
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| 67 | if (!beep)
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| 68 | return -ENOMEM;
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| 69 |
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| 70 | beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
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| 71 | if (IS_ERR(beep->desc))
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| 72 | return PTR_ERR(beep->desc);
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| 73 |
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| 74 | input = devm_input_allocate_device(&pdev->dev);
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| 75 | if (!input)
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| 76 | return -ENOMEM;
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| 77 |
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| 78 | INIT_WORK(&beep->work, gpio_beeper_work);
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| 79 |
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| 80 | input->name = pdev->name;
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| 81 | input->id.bustype = BUS_HOST;
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| 82 | input->id.vendor = 0x0001;
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| 83 | input->id.product = 0x0001;
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| 84 | input->id.version = 0x0100;
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| 85 | input->close = gpio_beeper_close;
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| 86 | input->event = gpio_beeper_event;
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| 87 |
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| 88 | input_set_capability(input, EV_SND, SND_BELL);
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| 89 |
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| 90 | input_set_drvdata(input, beep);
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| 91 |
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| 92 | return input_register_device(input);
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| 93 | }
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| 94 |
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| 95 | #ifdef CONFIG_OF
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| 96 | static const struct of_device_id gpio_beeper_of_match[] = {
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| 97 | { .compatible = "gpio-beeper", },
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| 98 | { }
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| 99 | };
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| 100 | MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
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| 101 | #endif
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| 102 |
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| 103 | static struct platform_driver gpio_beeper_platform_driver = {
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| 104 | .driver = {
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| 105 | .name = BEEPER_MODNAME,
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| 106 | .of_match_table = of_match_ptr(gpio_beeper_of_match),
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| 107 | },
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| 108 | .probe = gpio_beeper_probe,
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| 109 | };
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| 110 | module_platform_driver(gpio_beeper_platform_driver);
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| 111 |
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| 112 | MODULE_LICENSE("GPL");
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| 113 | MODULE_AUTHOR("Alexander Shiyan <[email protected]>");
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| 114 | MODULE_DESCRIPTION("Generic GPIO beeper driver");
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