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Diffstat (limited to 'drivers/platform/x86/adv_swbutton.c')
-rw-r--r--drivers/platform/x86/adv_swbutton.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/platform/x86/adv_swbutton.c b/drivers/platform/x86/adv_swbutton.c
new file mode 100644
index 000000000..38693b735
--- /dev/null
+++ b/drivers/platform/x86/adv_swbutton.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * adv_swbutton.c - Software Button Interface Driver.
+ *
+ * (C) Copyright 2020 Advantech Corporation, Inc
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#define ACPI_BUTTON_HID_SWBTN "AHC0310"
+
+#define ACPI_BUTTON_NOTIFY_SWBTN_RELEASE 0x86
+#define ACPI_BUTTON_NOTIFY_SWBTN_PRESSED 0x85
+
+struct adv_swbutton {
+ struct input_dev *input;
+ char phys[32];
+};
+
+/*-------------------------------------------------------------------------
+ * Driver Interface
+ *--------------------------------------------------------------------------
+ */
+static void adv_swbutton_notify(acpi_handle handle, u32 event, void *context)
+{
+ struct platform_device *device = context;
+ struct adv_swbutton *button = dev_get_drvdata(&device->dev);
+
+ switch (event) {
+ case ACPI_BUTTON_NOTIFY_SWBTN_RELEASE:
+ input_report_key(button->input, KEY_PROG1, 0);
+ input_sync(button->input);
+ break;
+ case ACPI_BUTTON_NOTIFY_SWBTN_PRESSED:
+ input_report_key(button->input, KEY_PROG1, 1);
+ input_sync(button->input);
+ break;
+ default:
+ dev_dbg(&device->dev, "Unsupported event [0x%x]\n", event);
+ }
+}
+
+static int adv_swbutton_probe(struct platform_device *device)
+{
+ struct adv_swbutton *button;
+ struct input_dev *input;
+ acpi_handle handle = ACPI_HANDLE(&device->dev);
+ acpi_status status;
+ int error;
+
+ button = devm_kzalloc(&device->dev, sizeof(*button), GFP_KERNEL);
+ if (!button)
+ return -ENOMEM;
+
+ dev_set_drvdata(&device->dev, button);
+
+ input = devm_input_allocate_device(&device->dev);
+ if (!input)
+ return -ENOMEM;
+
+ button->input = input;
+ snprintf(button->phys, sizeof(button->phys), "%s/button/input0", ACPI_BUTTON_HID_SWBTN);
+
+ input->name = "Advantech Software Button";
+ input->phys = button->phys;
+ input->id.bustype = BUS_HOST;
+ input->dev.parent = &device->dev;
+ set_bit(EV_REP, input->evbit);
+ input_set_capability(input, EV_KEY, KEY_PROG1);
+
+ error = input_register_device(input);
+ if (error)
+ return error;
+
+ device_init_wakeup(&device->dev, true);
+
+ status = acpi_install_notify_handler(handle,
+ ACPI_DEVICE_NOTIFY,
+ adv_swbutton_notify,
+ device);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&device->dev, "Error installing notify handler\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int adv_swbutton_remove(struct platform_device *device)
+{
+ acpi_handle handle = ACPI_HANDLE(&device->dev);
+
+ acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY,
+ adv_swbutton_notify);
+
+ return 0;
+}
+
+static const struct acpi_device_id button_device_ids[] = {
+ {ACPI_BUTTON_HID_SWBTN, 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, button_device_ids);
+
+static struct platform_driver adv_swbutton_driver = {
+ .driver = {
+ .name = "adv_swbutton",
+ .acpi_match_table = button_device_ids,
+ },
+ .probe = adv_swbutton_probe,
+ .remove = adv_swbutton_remove,
+};
+module_platform_driver(adv_swbutton_driver);
+
+MODULE_AUTHOR("Andrea Ho");
+MODULE_DESCRIPTION("Advantech ACPI SW Button Driver");
+MODULE_LICENSE("GPL v2");