262 lines
7.0 KiB
C
262 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/input.h>
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#include <linux/input/sparse-keymap.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/suspend.h>
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/* When NOT in tablet mode, VGBS returns with the flag 0x40 */
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#define TABLET_MODE_FLAG 0x40
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#define DOCK_MODE_FLAG 0x80
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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_KEY, 0xC0, { KEY_POWER } }, /* power key press */
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{ KE_IGNORE, 0xC1, { KEY_POWER } }, /* power key release */
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{ KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* 'Windows' key press */
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{ KE_KEY, 0xC3, { KEY_LEFTMETA } }, /* 'Windows' key release */
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{ KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* volume-up key press */
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{ KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* volume-up key release */
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{ KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* volume-down key press */
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{ KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* volume-down key release */
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{ KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key press */
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{ KE_KEY, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key release */
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{ KE_SW, 0xCA, { .sw = { SW_DOCK, 1 } } }, /* Docked */
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{ KE_SW, 0xCB, { .sw = { SW_DOCK, 0 } } }, /* Undocked */
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{ KE_SW, 0xCC, { .sw = { SW_TABLET_MODE, 1 } } }, /* Tablet */
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{ KE_SW, 0xCD, { .sw = { SW_TABLET_MODE, 0 } } }, /* Laptop */
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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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bool wakeup_mode;
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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 = devm_input_allocate_device(&device->dev);
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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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return ret;
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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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return input_register_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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unsigned int val = !(event & 1); /* Even=press, Odd=release */
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const struct key_entry *ke, *ke_rel;
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bool autorelease;
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if (priv->wakeup_mode) {
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ke = sparse_keymap_entry_from_scancode(priv->input_dev, event);
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if (ke) {
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pm_wakeup_hard_event(&device->dev);
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/*
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* Switch events like tablet mode will wake the device
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* and report the new switch position to the input
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* subsystem.
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*/
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if (ke->type == KE_SW)
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sparse_keymap_report_event(priv->input_dev,
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event,
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val,
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0);
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return;
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}
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goto out_unknown;
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}
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/*
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* Even press events are autorelease if there is no corresponding odd
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* release event, or if the odd event is KE_IGNORE.
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*/
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ke_rel = sparse_keymap_entry_from_scancode(priv->input_dev, event | 1);
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autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE);
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if (sparse_keymap_report_event(priv->input_dev, event, val, autorelease))
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return;
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out_unknown:
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dev_dbg(&device->dev, "unknown event index 0x%x\n", event);
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}
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static void detect_tablet_mode(struct platform_device *device)
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{
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const char *chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
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struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
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acpi_handle handle = ACPI_HANDLE(&device->dev);
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struct acpi_buffer vgbs_output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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int m;
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if (!(chassis_type && strcmp(chassis_type, "31") == 0))
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goto out;
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status = acpi_evaluate_object(handle, "VGBS", NULL, &vgbs_output);
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if (ACPI_FAILURE(status))
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goto out;
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obj = vgbs_output.pointer;
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if (!(obj && obj->type == ACPI_TYPE_INTEGER))
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goto out;
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m = !(obj->integer.value & TABLET_MODE_FLAG);
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input_report_switch(priv->input_dev, SW_TABLET_MODE, m);
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m = (obj->integer.value & DOCK_MODE_FLAG) ? 1 : 0;
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input_report_switch(priv->input_dev, SW_DOCK, m);
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out:
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kfree(vgbs_output.pointer);
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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_FAILURE(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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detect_tablet_mode(device);
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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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return -EBUSY;
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device_init_wakeup(&device->dev, true);
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return 0;
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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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device_init_wakeup(&device->dev, false);
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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 int intel_vbtn_pm_prepare(struct device *dev)
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{
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struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
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priv->wakeup_mode = true;
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return 0;
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}
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static int intel_vbtn_pm_resume(struct device *dev)
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{
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struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
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priv->wakeup_mode = false;
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return 0;
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}
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static const struct dev_pm_ops intel_vbtn_pm_ops = {
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.prepare = intel_vbtn_pm_prepare,
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.resume = intel_vbtn_pm_resume,
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.restore = intel_vbtn_pm_resume,
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.thaw = intel_vbtn_pm_resume,
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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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.pm = &intel_vbtn_pm_ops,
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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, NULL))
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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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