mirror of https://gitee.com/openkylin/linux.git
380 lines
10 KiB
C
380 lines
10 KiB
C
/*
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* Intel HID event & 5 button array driver
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*
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* Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
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* Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org>
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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 <linux/suspend.h>
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#include <acpi/acpi_bus.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alex Hung");
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static const struct acpi_device_id intel_hid_ids[] = {
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{"INT33D5", 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_hid_keymap[] = {
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/* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
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/* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
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{ KE_KEY, 3, { KEY_NUMLOCK } },
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{ KE_KEY, 4, { KEY_HOME } },
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{ KE_KEY, 5, { KEY_END } },
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{ KE_KEY, 6, { KEY_PAGEUP } },
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{ KE_KEY, 7, { KEY_PAGEDOWN } },
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{ KE_KEY, 8, { KEY_RFKILL } },
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{ KE_KEY, 9, { KEY_POWER } },
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{ KE_KEY, 11, { KEY_SLEEP } },
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/* 13 has two different meanings in the spec -- ignore it. */
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{ KE_KEY, 14, { KEY_STOPCD } },
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{ KE_KEY, 15, { KEY_PLAYPAUSE } },
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{ KE_KEY, 16, { KEY_MUTE } },
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{ KE_KEY, 17, { KEY_VOLUMEUP } },
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{ KE_KEY, 18, { KEY_VOLUMEDOWN } },
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{ KE_KEY, 19, { KEY_BRIGHTNESSUP } },
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{ KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
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/* 27: wake -- needs special handling */
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{ KE_END },
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};
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/* 5 button array notification value. */
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static const struct key_entry intel_array_keymap[] = {
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{ KE_KEY, 0xC2, { KEY_LEFTMETA } }, /* Press */
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{ KE_IGNORE, 0xC3, { KEY_LEFTMETA } }, /* Release */
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{ KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* Press */
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{ KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* Release */
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{ KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* Press */
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{ KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* Release */
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{ KE_SW, 0xC8, { .sw = { SW_ROTATE_LOCK, 1 } } }, /* Press */
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{ KE_SW, 0xC9, { .sw = { SW_ROTATE_LOCK, 0 } } }, /* Release */
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{ KE_KEY, 0xCE, { KEY_POWER } }, /* Press */
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{ KE_IGNORE, 0xCF, { KEY_POWER } }, /* Release */
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{ KE_END },
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};
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struct intel_hid_priv {
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struct input_dev *input_dev;
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struct input_dev *array;
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bool wakeup_mode;
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};
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static int intel_hid_set_enable(struct device *device, bool enable)
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{
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acpi_status status;
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status = acpi_execute_simple_method(ACPI_HANDLE(device), "HDSM",
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enable);
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if (ACPI_FAILURE(status)) {
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dev_warn(device, "failed to %sable hotkeys\n",
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enable ? "en" : "dis");
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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 void intel_button_array_enable(struct device *device, bool enable)
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{
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struct intel_hid_priv *priv = dev_get_drvdata(device);
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acpi_handle handle = ACPI_HANDLE(device);
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unsigned long long button_cap;
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acpi_status status;
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if (!priv->array)
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return;
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/* Query supported platform features */
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status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
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if (ACPI_FAILURE(status)) {
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dev_warn(device, "failed to get button capability\n");
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return;
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}
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/* Enable|disable features - power button is always enabled */
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status = acpi_execute_simple_method(handle, "BTNE",
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enable ? button_cap : 1);
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if (ACPI_FAILURE(status))
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dev_warn(device, "failed to set button capability\n");
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}
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static int intel_hid_pm_prepare(struct device *device)
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{
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struct intel_hid_priv *priv = dev_get_drvdata(device);
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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_hid_pl_suspend_handler(struct device *device)
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{
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if (pm_suspend_via_firmware()) {
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intel_hid_set_enable(device, false);
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intel_button_array_enable(device, false);
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}
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return 0;
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}
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static int intel_hid_pl_resume_handler(struct device *device)
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{
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struct intel_hid_priv *priv = dev_get_drvdata(device);
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priv->wakeup_mode = false;
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if (pm_resume_via_firmware()) {
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intel_hid_set_enable(device, true);
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intel_button_array_enable(device, true);
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}
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return 0;
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}
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static const struct dev_pm_ops intel_hid_pl_pm_ops = {
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.prepare = intel_hid_pm_prepare,
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.freeze = intel_hid_pl_suspend_handler,
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.thaw = intel_hid_pl_resume_handler,
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.restore = intel_hid_pl_resume_handler,
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.suspend = intel_hid_pl_suspend_handler,
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.resume = intel_hid_pl_resume_handler,
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};
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static int intel_hid_input_setup(struct platform_device *device)
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{
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struct intel_hid_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_hid_keymap, NULL);
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if (ret)
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return ret;
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priv->input_dev->name = "Intel HID events";
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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 int intel_button_array_input_setup(struct platform_device *device)
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{
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struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
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int ret;
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/* Setup input device for 5 button array */
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priv->array = devm_input_allocate_device(&device->dev);
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if (!priv->array)
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return -ENOMEM;
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ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
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if (ret)
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return ret;
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priv->array->name = "Intel HID 5 button array";
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priv->array->id.bustype = BUS_HOST;
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return input_register_device(priv->array);
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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_hid_priv *priv = dev_get_drvdata(&device->dev);
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unsigned long long ev_index;
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acpi_status status;
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if (priv->wakeup_mode) {
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/* Wake up on 5-button array events only. */
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if (event == 0xc0 || !priv->array)
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return;
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if (sparse_keymap_entry_from_scancode(priv->array, event))
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pm_wakeup_hard_event(&device->dev);
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else
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dev_info(&device->dev, "unknown event 0x%x\n", event);
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return;
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}
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/* 0xC0 is for HID events, other values are for 5 button array */
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if (event != 0xc0) {
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if (!priv->array ||
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!sparse_keymap_report_event(priv->array, event, 1, true))
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dev_info(&device->dev, "unknown event 0x%x\n", event);
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return;
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}
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status = acpi_evaluate_integer(handle, "HDEM", NULL, &ev_index);
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if (ACPI_FAILURE(status)) {
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dev_warn(&device->dev, "failed to get event index\n");
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return;
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}
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if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
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dev_info(&device->dev, "unknown event index 0x%llx\n",
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ev_index);
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}
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static int intel_hid_probe(struct platform_device *device)
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{
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acpi_handle handle = ACPI_HANDLE(&device->dev);
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unsigned long long event_cap, mode;
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struct intel_hid_priv *priv;
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acpi_status status;
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int err;
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status = acpi_evaluate_integer(handle, "HDMM", NULL, &mode);
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if (ACPI_FAILURE(status)) {
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dev_warn(&device->dev, "failed to read mode\n");
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return -ENODEV;
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}
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if (mode != 0) {
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/*
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* This driver only implements "simple" mode. There appear
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* to be no other modes, but we should be paranoid and check
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* for compatibility.
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*/
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dev_info(&device->dev, "platform is not in simple mode\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_hid_input_setup(device);
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if (err) {
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pr_err("Failed to setup Intel HID hotkeys\n");
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return err;
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}
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/* Setup 5 button array */
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status = acpi_evaluate_integer(handle, "HEBC", NULL, &event_cap);
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if (ACPI_SUCCESS(status) && (event_cap & 0x20000)) {
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dev_info(&device->dev, "platform supports 5 button array\n");
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err = intel_button_array_input_setup(device);
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if (err)
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pr_err("Failed to setup Intel 5 button array hotkeys\n");
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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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return -EBUSY;
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err = intel_hid_set_enable(&device->dev, true);
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if (err)
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goto err_remove_notify;
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if (priv->array) {
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intel_button_array_enable(&device->dev, true);
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/* Call button load method to enable HID power button */
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status = acpi_evaluate_object(handle, "BTNL", NULL, NULL);
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if (ACPI_FAILURE(status))
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dev_warn(&device->dev,
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"failed to enable HID power button\n");
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}
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device_init_wakeup(&device->dev, true);
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return 0;
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err_remove_notify:
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acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
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return err;
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}
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static int intel_hid_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, notify_handler);
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intel_hid_set_enable(&device->dev, false);
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intel_button_array_enable(&device->dev, false);
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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_hid_pl_driver = {
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.driver = {
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.name = "intel-hid",
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.acpi_match_table = intel_hid_ids,
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.pm = &intel_hid_pl_pm_ops,
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},
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.probe = intel_hid_probe,
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.remove = intel_hid_remove,
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};
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MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
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/*
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* Unfortunately, some laptops provide a _HID="INT33D5" device with
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* _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
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* ACPI node, so no platform device will be created. The pnpacpi
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* driver rejects this device in subsequent processing, so no physical
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* node is created at all.
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*
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* As a workaround until the ACPI core figures out how to handle
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* this corner case, manually ask the ACPI platform device code to
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* claim the ACPI node.
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*/
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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-hid: created platform device\n");
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return AE_OK;
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}
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static int __init intel_hid_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_hid_ids, NULL);
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return platform_driver_register(&intel_hid_pl_driver);
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}
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module_init(intel_hid_init);
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static void __exit intel_hid_exit(void)
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{
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platform_driver_unregister(&intel_hid_pl_driver);
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}
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module_exit(intel_hid_exit);
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