122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* adv_swbutton.c - Software Button Interface Driver.
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*
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* (C) Copyright 2020 Advantech Corporation, Inc
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#define ACPI_BUTTON_HID_SWBTN "AHC0310"
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#define ACPI_BUTTON_NOTIFY_SWBTN_RELEASE 0x86
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#define ACPI_BUTTON_NOTIFY_SWBTN_PRESSED 0x85
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struct adv_swbutton {
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struct input_dev *input;
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char phys[32];
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};
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/*-------------------------------------------------------------------------
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* Driver Interface
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*--------------------------------------------------------------------------
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*/
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static void adv_swbutton_notify(acpi_handle handle, u32 event, void *context)
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{
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struct platform_device *device = context;
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struct adv_swbutton *button = dev_get_drvdata(&device->dev);
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switch (event) {
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case ACPI_BUTTON_NOTIFY_SWBTN_RELEASE:
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input_report_key(button->input, KEY_PROG1, 0);
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input_sync(button->input);
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break;
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case ACPI_BUTTON_NOTIFY_SWBTN_PRESSED:
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input_report_key(button->input, KEY_PROG1, 1);
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input_sync(button->input);
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break;
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default:
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dev_dbg(&device->dev, "Unsupported event [0x%x]\n", event);
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}
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}
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static int adv_swbutton_probe(struct platform_device *device)
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{
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struct adv_swbutton *button;
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struct input_dev *input;
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acpi_handle handle = ACPI_HANDLE(&device->dev);
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acpi_status status;
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int error;
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button = devm_kzalloc(&device->dev, sizeof(*button), GFP_KERNEL);
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if (!button)
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return -ENOMEM;
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dev_set_drvdata(&device->dev, button);
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input = devm_input_allocate_device(&device->dev);
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if (!input)
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return -ENOMEM;
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button->input = input;
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snprintf(button->phys, sizeof(button->phys), "%s/button/input0", ACPI_BUTTON_HID_SWBTN);
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input->name = "Advantech Software Button";
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input->phys = button->phys;
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input->id.bustype = BUS_HOST;
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input->dev.parent = &device->dev;
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set_bit(EV_REP, input->evbit);
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input_set_capability(input, EV_KEY, KEY_PROG1);
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error = input_register_device(input);
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if (error)
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return error;
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device_init_wakeup(&device->dev, true);
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status = acpi_install_notify_handler(handle,
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ACPI_DEVICE_NOTIFY,
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adv_swbutton_notify,
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device);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Error installing notify handler\n");
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return -EIO;
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}
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return 0;
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}
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static int adv_swbutton_remove(struct platform_device *device)
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{
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acpi_handle handle = ACPI_HANDLE(&device->dev);
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acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY,
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adv_swbutton_notify);
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return 0;
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}
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static const struct acpi_device_id button_device_ids[] = {
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{ACPI_BUTTON_HID_SWBTN, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, button_device_ids);
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static struct platform_driver adv_swbutton_driver = {
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.driver = {
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.name = "adv_swbutton",
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.acpi_match_table = button_device_ids,
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},
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.probe = adv_swbutton_probe,
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.remove = adv_swbutton_remove,
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};
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module_platform_driver(adv_swbutton_driver);
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MODULE_AUTHOR("Andrea Ho");
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MODULE_DESCRIPTION("Advantech ACPI SW Button Driver");
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MODULE_LICENSE("GPL v2");
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