![AceLan Kao](/assets/img/avatar_default.png)
This driver supports power button event in Intel Virtual Button currently. New Dell XPS 13 requires this driver for the power button. This driver is copied/modified from intel-hid.c Most credit goes to the author of intel-hid.c, Alex Hung <alex.hung@canonical.com> Signed-off-by: AceLan Kao <acelan.kao@canonical.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
189 lines
4.7 KiB
C
189 lines
4.7 KiB
C
/*
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* Intel Virtual Button driver for Windows 8.1+
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*
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* Copyright (C) 2016 AceLan Kao <acelan.kao@canonical.com>
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* Copyright (C) 2016 Alex Hung <alex.hung@canonical.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/init.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/input/sparse-keymap.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("AceLan Kao");
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static const struct acpi_device_id intel_vbtn_ids[] = {
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{"INT33D6", 0},
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{"", 0},
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};
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/* In theory, these are HID usages. */
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static const struct key_entry intel_vbtn_keymap[] = {
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{ KE_IGNORE, 0xC0, { KEY_POWER } }, /* power key press */
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{ KE_KEY, 0xC1, { KEY_POWER } }, /* power key release */
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{ KE_END },
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};
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struct intel_vbtn_priv {
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struct input_dev *input_dev;
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};
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static int intel_vbtn_input_setup(struct platform_device *device)
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{
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struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
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int ret;
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priv->input_dev = input_allocate_device();
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if (!priv->input_dev)
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return -ENOMEM;
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ret = sparse_keymap_setup(priv->input_dev, intel_vbtn_keymap, NULL);
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if (ret)
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goto err_free_device;
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priv->input_dev->dev.parent = &device->dev;
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priv->input_dev->name = "Intel Virtual Button driver";
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priv->input_dev->id.bustype = BUS_HOST;
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ret = input_register_device(priv->input_dev);
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if (ret)
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goto err_free_device;
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return 0;
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err_free_device:
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input_free_device(priv->input_dev);
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return ret;
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}
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static void intel_vbtn_input_destroy(struct platform_device *device)
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{
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struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
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input_unregister_device(priv->input_dev);
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}
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static void notify_handler(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 intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
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if (!sparse_keymap_report_event(priv->input_dev, event, 1, true))
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dev_info(&device->dev, "unknown event index 0x%x\n",
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event);
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}
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static int intel_vbtn_probe(struct platform_device *device)
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{
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acpi_handle handle = ACPI_HANDLE(&device->dev);
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struct intel_vbtn_priv *priv;
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acpi_status status;
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int err;
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status = acpi_evaluate_object(handle, "VBDL", NULL, NULL);
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if (!ACPI_SUCCESS(status)) {
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dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n");
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return -ENODEV;
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}
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priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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dev_set_drvdata(&device->dev, priv);
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err = intel_vbtn_input_setup(device);
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if (err) {
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pr_err("Failed to setup Intel Virtual Button\n");
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return err;
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}
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status = acpi_install_notify_handler(handle,
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ACPI_DEVICE_NOTIFY,
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notify_handler,
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device);
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if (ACPI_FAILURE(status)) {
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err = -EBUSY;
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goto err_remove_input;
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}
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return 0;
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err_remove_input:
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intel_vbtn_input_destroy(device);
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return err;
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}
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static int intel_vbtn_remove(struct platform_device *device)
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{
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acpi_handle handle = ACPI_HANDLE(&device->dev);
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intel_vbtn_input_destroy(device);
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acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
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/*
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* Even if we failed to shut off the event stream, we can still
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* safely detach from the device.
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*/
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return 0;
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}
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static struct platform_driver intel_vbtn_pl_driver = {
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.driver = {
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.name = "intel-vbtn",
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.acpi_match_table = intel_vbtn_ids,
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},
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.probe = intel_vbtn_probe,
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.remove = intel_vbtn_remove,
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};
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MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids);
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static acpi_status __init
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check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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const struct acpi_device_id *ids = context;
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struct acpi_device *dev;
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if (acpi_bus_get_device(handle, &dev) != 0)
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return AE_OK;
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if (acpi_match_device_ids(dev, ids) == 0)
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if (acpi_create_platform_device(dev))
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dev_info(&dev->dev,
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"intel-vbtn: created platform device\n");
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return AE_OK;
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}
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static int __init intel_vbtn_init(void)
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{
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acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, check_acpi_dev, NULL,
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(void *)intel_vbtn_ids, NULL);
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return platform_driver_register(&intel_vbtn_pl_driver);
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}
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module_init(intel_vbtn_init);
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static void __exit intel_vbtn_exit(void)
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{
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platform_driver_unregister(&intel_vbtn_pl_driver);
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}
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module_exit(intel_vbtn_exit);
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