[PATCH 2/2] platform/x86: system76_acpi: Add input driver

["Jeremy Soller" <jeremy@xxxxxxxxxxxx>]

platform/x86: system76_acpi: Add input driver

The input driver reports KEY_SCREENLOCK when the firmware notifies the
kernel of event 0x85. This is to support hardware with a screen lock
hotkey.

Signed-off-by: Jeremy Soller <jeremy@xxxxxxxxxxxx>
Cc: platform-driver-x86@xxxxxxxxxxxxxxx
---
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index d2f9c3dcf4b9..a8b75c1b96fb 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1159,6 +1159,7 @@ config SYSTEM76_ACPI
 	tristate "System76 ACPI Driver"
 	depends on ACPI
 	depends on HWMON
+	depends on INPUT
 	select NEW_LEDS
 	select LEDS_CLASS
 	select LEDS_TRIGGERS
diff --git a/drivers/platform/x86/system76_acpi.c b/drivers/platform/x86/system76_acpi.c
index aef0ea34829d..eaff9adea504 100644
--- a/drivers/platform/x86/system76_acpi.c
+++ b/drivers/platform/x86/system76_acpi.c
@@ -13,6 +13,7 @@
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/init.h>
+#include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/leds.h>
 #include <linux/module.h>
@@ -29,6 +30,7 @@ struct system76_data {
 	struct device *therm;
 	union acpi_object *nfan;
 	union acpi_object *ntmp;
+	struct input_dev *input;
 };
 
 static const struct acpi_device_id device_ids[] = {
@@ -437,6 +439,15 @@ static const struct hwmon_chip_info thermal_chip_info = {
 	.info = thermal_channel_info,
 };
 
+static void input_key(struct system76_data *data, unsigned int code)
+{
+	input_report_key(data->input, code, 1);
+	input_sync(data->input);
+
+	input_report_key(data->input, code, 0);
+	input_sync(data->input);
+}
+
 // Handle ACPI notification
 static void system76_notify(struct acpi_device *acpi_dev, u32 event)
 {
@@ -459,6 +470,9 @@ static void system76_notify(struct acpi_device *acpi_dev, u32 event)
 	case 0x84:
 		kb_led_hotkey_color(data);
 		break;
+	case 0x85:
+		input_key(data, KEY_SCREENLOCK);
+		break;
 	}
 }
 
@@ -524,6 +538,21 @@ static int system76_add(struct acpi_device *acpi_dev)
 	if (IS_ERR(data->therm))
 		return PTR_ERR(data->therm);
 
+	data->input = devm_input_allocate_device(&acpi_dev->dev);
+	if (!data->input)
+		return -ENOMEM;
+	data->input->name = "System76 ACPI Hotkeys";
+	data->input->phys = "system76_acpi/input0";
+	data->input->id.bustype = BUS_HOST;
+	data->input->dev.parent = &acpi_dev->dev;
+	set_bit(EV_KEY, data->input->evbit);
+	set_bit(KEY_SCREENLOCK, data->input->keybit);
+	err = input_register_device(data->input);
+	if (err) {
+		input_free_device(data->input);
+		return err;
+	}
+
 	return 0;
 }