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From 7a622d9869602cf5587cadf418f3eed48a39ab90 Mon Sep 17 00:00:00 2001
From: Philipp Jungkamp <p.jungkamp@gmx.net>
Date: Sat, 30 Jul 2022 15:21:20 +0200
Subject: [PATCH 4/9] Add IdeaPad WMI Fn Keys driver
Create an input device for WMI events corresponding to some special
keys on the 'Lenovo Yoga' line.
This include the 3 keys to the right on the 'Lenovo Yoga9 14IAP7' and
additionally the 'Lenovo Support' and 'Lenovo Favorites' (star with 'S'
inside) in the fn key row.
Signed-off-by: Philipp Jungkamp <p.jungkamp@gmx.net>
---
drivers/platform/x86/Kconfig | 13 ++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/ideapad-wmi-fn-keys.c | 151 +++++++++++++++++++++
3 files changed, 165 insertions(+)
create mode 100644 drivers/platform/x86/ideapad-wmi-fn-keys.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index bc4013e950ed..6ff757332aa0 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -140,6 +140,19 @@ config YOGABOOK_WMI
To compile this driver as a module, choose M here: the module will
be called lenovo-yogabook-wmi.
+config IDEAPAD_WMI_FN_KEYS
+ tristate "Lenovo IdeaPad WMI Fn Keys"
+ depends on ACPI_WMI
+ depends on INPUT
+ select INPUT_SPARSEKMAP
+ help
+ Say Y here if you want to receive key presses from some lenovo
+ specific keys. (Star Key, Support Key, Virtual Background,
+ Dark Mode Toggle, ...)
+
+ To compile this driver as a module, choose M here: the module will
+ be called ideapad-wmi-fn-keys.
+
config ACERHDF
tristate "Acer Aspire One temperature and fan driver"
depends on ACPI && THERMAL
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 4a59f47a46e2..5e9b678e48b9 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PEAQ_WMI) += peaq-wmi.o
obj-$(CONFIG_XIAOMI_WMI) += xiaomi-wmi.o
obj-$(CONFIG_GIGABYTE_WMI) += gigabyte-wmi.o
obj-$(CONFIG_YOGABOOK_WMI) += lenovo-yogabook-wmi.o
+obj-$(CONFIG_IDEAPAD_WMI_FN_KEYS) += ideapad-wmi-fn-keys.o
# Acer
obj-$(CONFIG_ACERHDF) += acerhdf.o
diff --git a/drivers/platform/x86/ideapad-wmi-fn-keys.c b/drivers/platform/x86/ideapad-wmi-fn-keys.c
new file mode 100644
index 000000000000..04cac40bc044
--- /dev/null
+++ b/drivers/platform/x86/ideapad-wmi-fn-keys.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ideapad-wmi-fn-keys.c - Ideapad WMI fn keys driver
+ *
+ * Copyright (C) 2022 Philipp Jungkamp <p.jungkamp@gmx.net>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/wmi.h>
+
+#define IDEAPAD_FN_KEY_EVENT_GUID "8FC0DE0C-B4E4-43FD-B0F3-8871711C1294"
+
+struct ideapad_wmi_private {
+ struct wmi_device *wmi_device;
+ struct input_dev *input_dev;
+};
+
+static const struct key_entry ideapad_wmi_fn_key_keymap[] = {
+ /* FnLock (handled by the firmware) */
+ { KE_IGNORE, 0x02 },
+ /* Customizable Lenovo Hotkey ("star" with 'S' inside) */
+ { KE_KEY, 0x01, { KEY_FAVORITES } },
+ /* Dark mode toggle */
+ { KE_KEY, 0x13, { KEY_PROG1 } },
+ /* Sound profile switch */
+ { KE_KEY, 0x12, { KEY_PROG2 } },
+ /* Lenovo Virtual Background application */
+ { KE_KEY, 0x28, { KEY_PROG3 } },
+ /* Lenovo Support */
+ { KE_KEY, 0x27, { KEY_HELP } },
+ { KE_END },
+};
+
+static int ideapad_wmi_input_init(struct ideapad_wmi_private *priv)
+{
+ struct input_dev *input_dev;
+ int err;
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ return -ENOMEM;
+ }
+
+ input_dev->name = "Ideapad WMI Fn Keys";
+ input_dev->phys = IDEAPAD_FN_KEY_EVENT_GUID "/input0";
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->dev.parent = &priv->wmi_device->dev;
+
+ err = sparse_keymap_setup(input_dev, ideapad_wmi_fn_key_keymap, NULL);
+ if (err) {
+ dev_err(&priv->wmi_device->dev,
+ "Could not set up input device keymap: %d\n", err);
+ goto err_free_dev;
+ }
+
+ err = input_register_device(input_dev);
+ if (err) {
+ dev_err(&priv->wmi_device->dev,
+ "Could not register input device: %d\n", err);
+ goto err_free_dev;
+ }
+
+ priv->input_dev = input_dev;
+ return 0;
+
+err_free_dev:
+ input_free_device(input_dev);
+ return err;
+}
+
+static void ideapad_wmi_input_exit(struct ideapad_wmi_private *priv)
+{
+ input_unregister_device(priv->input_dev);
+ priv->input_dev = NULL;
+}
+
+static void ideapad_wmi_input_report(struct ideapad_wmi_private *priv,
+ unsigned int scancode)
+{
+ sparse_keymap_report_event(priv->input_dev, scancode, 1, true);
+}
+
+static int ideapad_wmi_probe(struct wmi_device *wdev, const void *ctx)
+{
+ struct ideapad_wmi_private *priv;
+ int err;
+
+ priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(&wdev->dev, priv);
+
+ priv->wmi_device = wdev;
+
+ err = ideapad_wmi_input_init(priv);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static void ideapad_wmi_remove(struct wmi_device *wdev)
+{
+ struct ideapad_wmi_private *priv = dev_get_drvdata(&wdev->dev);
+
+ ideapad_wmi_input_exit(priv);
+}
+
+static void ideapad_wmi_notify(struct wmi_device *wdev, union acpi_object *data)
+{
+ struct ideapad_wmi_private *priv = dev_get_drvdata(&wdev->dev);
+
+ if(data->type != ACPI_TYPE_INTEGER) {
+ dev_warn(&priv->wmi_device->dev,
+ "WMI event data is not an integer\n");
+ return;
+ }
+
+ ideapad_wmi_input_report(priv, data->integer.value);
+}
+
+static const struct wmi_device_id ideapad_wmi_id_table[] = {
+ { /* Special Keys on the Yoga 9 14IAP7 */
+ .guid_string = IDEAPAD_FN_KEY_EVENT_GUID
+ },
+ { }
+};
+
+static struct wmi_driver ideapad_wmi_driver = {
+ .driver = {
+ .name = "ideapad-wmi-fn-keys",
+ },
+ .id_table = ideapad_wmi_id_table,
+ .probe = ideapad_wmi_probe,
+ .remove = ideapad_wmi_remove,
+ .notify = ideapad_wmi_notify,
+};
+
+module_wmi_driver(ideapad_wmi_driver);
+
+MODULE_DEVICE_TABLE(wmi, ideapad_wmi_id_table);
+MODULE_AUTHOR("Philipp Jungkamp <p.jungkamp@gmx.net>");
+MODULE_DESCRIPTION("Ideapad WMI fn keys driver");
+MODULE_LICENSE("GPL");
--
2.37.1
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