[PATCH] HID: LOFREE: Fix back/forward buttons for

[stepeos <stevepeter.oswald@gmail.com>]

From: Steve Oswald <stevepeter.oswald@gmail.com>

---
 drivers/hid/hid-ids.h    |  3 ++
 drivers/hid/hid-lofree.c | 96 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 drivers/hid/hid-lofree.c

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 33cc5820f2be..cb2704550043 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -848,6 +848,9 @@
 #define USB_DEVICE_ID_PXN_V12_LITE_2	0x1211
 #define USB_DEVICE_LITE_STAR_GT987_FF	0x2141
 
+#define USB_VENDOR_ID_LOFREE		0x248A
+#define USB_VENDOR_ID_LOFREE_TOUCH		0x8266
+
 #define USB_VENDOR_ID_LOGITECH		0x046d
 #define USB_DEVICE_ID_LOGITECH_Z_10_SPK	0x0a07
 #define USB_DEVICE_ID_LOGITECH_AUDIOHUB 0x0a0e
diff --git a/drivers/hid/hid-lofree.c b/drivers/hid/hid-lofree.c
new file mode 100644
index 000000000000..89383527e519
--- /dev/null
+++ b/drivers/hid/hid-lofree.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Custom HID driver for Lofree products
+ * Adds support for Back (BTN_SIDE) and Forward (BTN_EXTRA) buttons
+ * 
+ * Copyright (c) 2025 Steve Oswald
+ * based on hid-cherry
+ */
+
+#include <linux/module.h>
+#include <linux/hid.h>
+#include <linux/input.h>
+#include "hid-ids.h"
+
+/*
+ * Remaps back/forward buttons to input events for Lofree Touch.
+ */
+static int lofree_touch_raw_event(struct hid_device *hdev,
+				  struct hid_report *report, u8 *data, int size)
+{
+	struct hid_input *hidinput;
+	struct input_dev *input;
+
+	if (report->id != 3)
+		return 0;
+
+	list_for_each_entry(hidinput, &hdev->inputs, list) {
+		input = hidinput->input;
+		input_report_key(input, BTN_SIDE, !!(data[1] & 0x08));
+		input_report_key(input, BTN_EXTRA, !!(data[1] & 0x10));
+		input_sync(input);
+	}
+
+	return 0;
+}
+
+/*
+ * Apply capabilities.
+ */
+static int lofree_touch_input_configured(struct hid_device *hdev,
+					 struct hid_input *hi)
+{
+	struct input_dev *input = hi->input;
+
+	input_set_capability(input, EV_KEY, BTN_SIDE);
+	input_set_capability(input, EV_KEY, BTN_EXTRA);
+
+	return 0;
+}
+
+static int lofree_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int ret;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "HID parse failed\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hdev, "HID hw start failed\n");
+		return ret;
+	}
+
+	hid_info(hdev, "Touch@LOFREE custom HID driver loaded\n");
+	return 0;
+}
+
+static void lofree_remove(struct hid_device *hdev)
+{
+	hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id lofree_touch_devices[] = {
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOFREE,
+			       USB_VENDOR_ID_LOFREE_TOUCH) },
+	{}
+};
+MODULE_DEVICE_TABLE(hid, lofree_touch_devices);
+
+static struct hid_driver lofree_touch_driver = {
+	.name = "hid_lofree_touch",
+	.id_table = lofree_touch_devices,
+	.probe = lofree_probe,
+	.remove = lofree_remove,
+	.raw_event = lofree_touch_raw_event,
+	.input_configured = lofree_touch_input_configured,
+};
+
+module_hid_driver(lofree_touch_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(
+	"HID driver for some special Lofree devices like Lofree Touch mouse.");
-- 
2.48.1