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platform/x86: intel-hid: Support 5 button array
New firmwares include a feature called 5 button array that supports super key, volume up/down, rotation lock and power button. Support for this feature is required to fix power button on some recent systems. This patch was tested on a Dell Latitude 7480. Signed-off-by: Alex Hung <alex.hung@canonical.com> Reviewed-by: Michał Kępień <kernel@kempniu.pl> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
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c685e20df5
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1 changed files with 91 additions and 5 deletions
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@ -1,5 +1,5 @@
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/*
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* Intel HID event driver for Windows 8
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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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@ -57,8 +57,24 @@ static const struct key_entry intel_hid_keymap[] = {
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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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};
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static int intel_hid_set_enable(struct device *device, int enable)
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@ -78,15 +94,43 @@ static int intel_hid_set_enable(struct device *device, int enable)
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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_pl_suspend_handler(struct device *device)
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{
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intel_hid_set_enable(device, 0);
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intel_button_array_enable(device, false);
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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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intel_hid_set_enable(device, 1);
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intel_button_array_enable(device, true);
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return 0;
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}
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@ -126,6 +170,27 @@ static int intel_hid_input_setup(struct platform_device *device)
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return ret;
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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->dev.parent = &device->dev;
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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 intel_hid_input_destroy(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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@ -140,10 +205,11 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
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unsigned long long ev_index;
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acpi_status status;
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/* The platform spec only defines one event code: 0xC0. */
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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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dev_warn(&device->dev, "received unknown event (0x%x)\n",
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event);
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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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@ -161,8 +227,8 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
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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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unsigned long long mode;
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acpi_status status;
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int err;
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@ -193,6 +259,15 @@ static int intel_hid_probe(struct platform_device *device)
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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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@ -206,6 +281,16 @@ static int intel_hid_probe(struct platform_device *device)
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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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return 0;
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err_remove_notify:
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@ -224,6 +309,7 @@ static int intel_hid_remove(struct platform_device *device)
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acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
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intel_hid_input_destroy(device);
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intel_hid_set_enable(&device->dev, 0);
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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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