Merging upstream version 6.10.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/drivers/platform/x86/quickstart.c b/drivers/platform/x86/quickstart.c
new file mode 100644
index 0000000000..df496c7e71
--- /dev/null
+++ b/drivers/platform/x86/quickstart.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ACPI Direct App Launch driver
+ *
+ * Copyright (C) 2024 Armin Wolf <W_Armin@gmx.de>
+ * Copyright (C) 2022 Arvid Norlander <lkml@vorapal.se>
+ * Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
+ *
+ * Information gathered from disassembled dsdt and from here:
+ * <https://archive.org/details/microsoft-acpi-dirapplaunch>
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeup.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include <asm/unaligned.h>
+
+#define DRIVER_NAME	"quickstart"
+
+/*
+ * There will be two events:
+ * 0x02 - Button was pressed while device was off/sleeping.
+ * 0x80 - Button was pressed while device was up.
+ */
+#define QUICKSTART_EVENT_RUNTIME	0x80
+
+struct quickstart_data {
+	struct device *dev;
+	struct mutex input_lock;	/* Protects input sequence during notify */
+	struct input_dev *input_device;
+	char input_name[32];
+	char phys[32];
+	u32 id;
+};
+
+/*
+ * Knowing what these buttons do require system specific knowledge.
+ * This could be done by matching on DMI data in a long quirk table.
+ * However, it is easier to leave it up to user space to figure this out.
+ *
+ * Using for example udev hwdb the scancode 0x1 can be remapped suitably.
+ */
+static const struct key_entry quickstart_keymap[] = {
+	{ KE_KEY, 0x1, { KEY_UNKNOWN } },
+	{ KE_END, 0 },
+};
+
+static ssize_t button_id_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct quickstart_data *data = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", data->id);
+}
+static DEVICE_ATTR_RO(button_id);
+
+static struct attribute *quickstart_attrs[] = {
+	&dev_attr_button_id.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(quickstart);
+
+static void quickstart_notify(acpi_handle handle, u32 event, void *context)
+{
+	struct quickstart_data *data = context;
+
+	switch (event) {
+	case QUICKSTART_EVENT_RUNTIME:
+		mutex_lock(&data->input_lock);
+		sparse_keymap_report_event(data->input_device, 0x1, 1, true);
+		mutex_unlock(&data->input_lock);
+
+		acpi_bus_generate_netlink_event(DRIVER_NAME, dev_name(data->dev), event, 0);
+		break;
+	default:
+		dev_err(data->dev, FW_INFO "Unexpected ACPI notify event (%u)\n", event);
+		break;
+	}
+}
+
+/*
+ * The GHID ACPI method is used to indicate the "role" of the button.
+ * However, all the meanings of these values are vendor defined.
+ *
+ * We do however expose this value to user space.
+ */
+static int quickstart_get_ghid(struct quickstart_data *data)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	acpi_handle handle = ACPI_HANDLE(data->dev);
+	union acpi_object *obj;
+	acpi_status status;
+	int ret = 0;
+
+	/*
+	 * This returns a buffer telling the button usage ID,
+	 * and triggers pending notify events (The ones before booting).
+	 */
+	status = acpi_evaluate_object_typed(handle, "GHID", NULL, &buffer, ACPI_TYPE_BUFFER);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	obj = buffer.pointer;
+	if (!obj)
+		return -ENODATA;
+
+	/*
+	 * Quoting the specification:
+	 * "The GHID method can return a BYTE, WORD, or DWORD.
+	 *  The value must be encoded in little-endian byte
+	 *  order (least significant byte first)."
+	 */
+	switch (obj->buffer.length) {
+	case 1:
+		data->id = obj->buffer.pointer[0];
+		break;
+	case 2:
+		data->id = get_unaligned_le16(obj->buffer.pointer);
+		break;
+	case 4:
+		data->id = get_unaligned_le32(obj->buffer.pointer);
+		break;
+	default:
+		dev_err(data->dev,
+			FW_BUG "GHID method returned buffer of unexpected length %u\n",
+			obj->buffer.length);
+		ret = -EIO;
+		break;
+	}
+
+	kfree(obj);
+
+	return ret;
+}
+
+static void quickstart_notify_remove(void *context)
+{
+	struct quickstart_data *data = context;
+	acpi_handle handle;
+
+	handle = ACPI_HANDLE(data->dev);
+
+	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, quickstart_notify);
+}
+
+static void quickstart_mutex_destroy(void *data)
+{
+	struct mutex *lock = data;
+
+	mutex_destroy(lock);
+}
+
+static int quickstart_probe(struct platform_device *pdev)
+{
+	struct quickstart_data *data;
+	acpi_handle handle;
+	acpi_status status;
+	int ret;
+
+	handle = ACPI_HANDLE(&pdev->dev);
+	if (!handle)
+		return -ENODEV;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->dev = &pdev->dev;
+	dev_set_drvdata(&pdev->dev, data);
+
+	mutex_init(&data->input_lock);
+	ret = devm_add_action_or_reset(&pdev->dev, quickstart_mutex_destroy, &data->input_lock);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * We have to initialize the device wakeup before evaluating GHID because
+	 * doing so will notify the device if the button was used to wake the machine
+	 * from S5.
+	 */
+	device_init_wakeup(&pdev->dev, true);
+
+	ret = quickstart_get_ghid(data);
+	if (ret < 0)
+		return ret;
+
+	data->input_device = devm_input_allocate_device(&pdev->dev);
+	if (!data->input_device)
+		return -ENOMEM;
+
+	ret = sparse_keymap_setup(data->input_device, quickstart_keymap, NULL);
+	if (ret < 0)
+		return ret;
+
+	snprintf(data->input_name, sizeof(data->input_name), "Quickstart Button %u", data->id);
+	snprintf(data->phys, sizeof(data->phys), DRIVER_NAME "/input%u", data->id);
+
+	data->input_device->name = data->input_name;
+	data->input_device->phys = data->phys;
+	data->input_device->id.bustype = BUS_HOST;
+
+	ret = input_register_device(data->input_device);
+	if (ret < 0)
+		return ret;
+
+	status = acpi_install_notify_handler(handle, ACPI_DEVICE_NOTIFY, quickstart_notify, data);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	return devm_add_action_or_reset(&pdev->dev, quickstart_notify_remove, data);
+}
+
+static const struct acpi_device_id quickstart_device_ids[] = {
+	{ "PNP0C32" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, quickstart_device_ids);
+
+static struct platform_driver quickstart_platform_driver = {
+	.driver	= {
+		.name = DRIVER_NAME,
+		.dev_groups = quickstart_groups,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.acpi_match_table = quickstart_device_ids,
+	},
+	.probe = quickstart_probe,
+};
+module_platform_driver(quickstart_platform_driver);
+
+MODULE_AUTHOR("Armin Wolf <W_Armin@gmx.de>");
+MODULE_AUTHOR("Arvid Norlander <lkml@vorpal.se>");
+MODULE_AUTHOR("Angelo Arrifano");
+MODULE_DESCRIPTION("ACPI Direct App Launch driver");
+MODULE_LICENSE("GPL");