[PATCH] Input: hid-winwing module

[Ivan Gorinov]

Support for WinWing Orion2 throttle.

Signed-off-by: Ivan Gorinov <linux-kernel@xxxxxxxxxxxxxx>
---
 drivers/hid/Kconfig       |  12 ++
 drivers/hid/Makefile      |   1 +
 drivers/hid/hid-winwing.c | 231 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 244 insertions(+)
 create mode 100644 drivers/hid/hid-winwing.c

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 4c682c650704..cb41613cebbd 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -1236,6 +1236,18 @@ config HID_WIIMOTE
 	To compile this driver as a module, choose M here: the
 	module will be called hid-wiimote.

+config HID_WINWING
+	tristate "WinWing Orion2 throttle with F/A-18 grip support (USB)"
+	depends on USB_HID
+	depends on NEW_LEDS
+	depends on LEDS_CLASS
+	help
+	  Support for WinWing Orion2 throttle.
+	  Enables all buttons and switches on the base.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called hid-winwing.
+
 config HID_XINMO
 	tristate "Xin-Mo non-fully compliant devices"
 	help
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 082a728eac60..ce71b53ea6c5 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -150,6 +150,7 @@ wacom-objs			:= wacom_wac.o wacom_sys.o
 obj-$(CONFIG_HID_WACOM)		+= wacom.o
 obj-$(CONFIG_HID_WALTOP)	+= hid-waltop.o
 obj-$(CONFIG_HID_WIIMOTE)	+= hid-wiimote.o
+obj-$(CONFIG_HID_WINWING)	+= hid-winwing.o
 obj-$(CONFIG_HID_SENSOR_HUB)	+= hid-sensor-hub.o
 obj-$(CONFIG_HID_SENSOR_CUSTOM_SENSOR)	+= hid-sensor-custom.o

diff --git a/drivers/hid/hid-winwing.c b/drivers/hid/hid-winwing.c
new file mode 100644
index 000000000000..a08f97458aef
--- /dev/null
+++ b/drivers/hid/hid-winwing.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * HID driver for WinWing Orion 2 throttle
+ *
+ * Copyright (c) 2023 Ivan Gorinov
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/hidraw.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+
+#define MAX_REPORT 16
+
+struct winwing_led {
+	struct led_classdev cdev;
+	struct hid_device *hdev;
+	int number;
+};
+
+struct winwing_led_info {
+	int number;
+	int max_brightness;
+	const char *led_name;
+};
+
+static struct winwing_led_info led_info[3] = {
+	{ 0, 255, "backlight" },
+	{ 1, 1, "a-a" },
+	{ 2, 1, "a-g" },
+};
+
+struct winwing_drv_data {
+	struct hid_device *hdev;
+	__u8 *report_buf;
+	struct mutex lock;
+	unsigned int num_leds;
+	struct winwing_led leds[];
+};
+
+static int winwing_led_write(struct led_classdev *cdev, enum 
led_brightness br)
+{
+	struct winwing_led *led = (struct winwing_led *) cdev;
+	struct winwing_drv_data *data = hid_get_drvdata(led->hdev);
+	__u8 *buf = data->report_buf;
+	int ret;
+
+	mutex_lock(&data->lock);
+
+	buf[0] = 0x02;
+	buf[1] = 0x60;
+	buf[2] = 0xbe;
+	buf[3] = 0x00;
+	buf[4] = 0x00;
+	buf[5] = 0x03;
+	buf[6] = 0x49;
+	buf[7] = led->number;
+	buf[8] = br;
+	buf[9] = 0x00;
+	buf[10] = 0;
+	buf[11] = 0;
+	buf[12] = 0;
+	buf[13] = 0;
+
+	ret = hid_hw_output_report(led->hdev, buf, 14);
+
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int winwing_init_led(struct hid_device *hdev, struct input_dev 
*input)
+{
+	struct winwing_drv_data *data;
+	struct winwing_led *led;
+	int ret;
+	int i;
+
+	size_t data_size = struct_size(data, leds, 3);
+
+	data = devm_kzalloc(&hdev->dev, data_size, GFP_KERNEL);
+
+	if (!data)
+		return -ENOMEM;
+
+	data->report_buf = devm_kmalloc(&hdev->dev, MAX_REPORT, GFP_KERNEL);
+
+	if (!data->report_buf)
+		return -ENOMEM;
+
+	for (i = 0; i < 3; i += 1) {
+		struct winwing_led_info *info = &led_info[i];
+
+		led = &data->leds[i];
+		led->hdev = hdev;
+		led->number = info->number;
+		led->cdev.max_brightness = info->max_brightness;
+		led->cdev.brightness_set_blocking = winwing_led_write;
+		led->cdev.flags = LED_HW_PLUGGABLE;
+		led->cdev.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
+						"%s::%s",
+						dev_name(&input->dev),
+						info->led_name);
+
+		ret = devm_led_classdev_register(&hdev->dev, &led->cdev);
+		if (ret)
+			return ret;
+	}
+
+	hid_set_drvdata(hdev, data);
+
+	return ret;
+}
+
+static int winwing_probe(struct hid_device *hdev,
+			const struct hid_device_id *id)
+{
+	unsigned int minor;
+	int ret;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "parse failed\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hdev, "hw start failed\n");
+		return ret;
+	}
+
+	minor = ((struct hidraw *) hdev->hidraw)->minor;
+
+	return 0;
+}
+
+static int winwing_input_configured(struct hid_device *hdev,
+			struct hid_input *hidinput)
+{
+	int ret;
+
+	ret = winwing_init_led(hdev, hidinput->input);
+
+	if (ret)
+		hid_err(hdev, "led init failed\n");
+
+	return ret;
+}
+
+static __u8 original_rdesc_buttons[] = {
+	0x05, 0x09, 0x19, 0x01, 0x29, 0x6F,
+	0x15, 0x00, 0x25, 0x01, 0x35, 0x00,
+	0x45, 0x01, 0x75, 0x01,	0x95, 0x6F,
+	0x81, 0x02, 0x75, 0x01, 0x95, 0x01,
+	0x81, 0x01
+};
+
+/*
+ * HID report descriptor shows 111 buttons, which exceeds maximum
+ * number of buttons (80) supported by Linux kernel HID subsystem.
+ *
+ * This module skips numbers 32-63, unused on some throttle grips.
+ */
+
+static __u8 *winwing_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int *rsize)
+{
+	int sig_length = sizeof(original_rdesc_buttons);
+	int unused_button_numbers = 32;
+
+	if (*rsize < 34)
+		return rdesc;
+
+	if (memcmp(rdesc + 8, original_rdesc_buttons, sig_length) == 0) {
+
+		/* Usage Maximum */
+		rdesc[13] -= unused_button_numbers;
+
+		/*  Report Count for buttons */
+		rdesc[25] -= unused_button_numbers;
+
+		/*  Report Count for padding [HID1_11, 6.2.2.9] */
+		rdesc[31] += unused_button_numbers;
+
+		hid_info(hdev, "winwing descriptor fixed\n");
+	}
+
+	return rdesc;
+}
+
+static int winwing_raw_event(struct hid_device *hdev,
+		struct hid_report *report, u8 *raw_data, int size)
+{
+	if (size >= 15) {
+		/* Skip buttons 32 .. 63 */
+		memmove(raw_data + 5, raw_data + 9, 6);
+
+		/* Clear the padding */
+		memset(raw_data + 11, 0, 4);
+	}
+
+	return 0;
+}
+
+static const struct hid_device_id winwing_devices[] = {
+	/* Orion2 base with F/A-18 Hornet grip */
+	{ HID_USB_DEVICE(0x4098, 0xbe62) },
+
+	/* Orion2 base with F-16 Hornet grip */
+	{ HID_USB_DEVICE(0x4098, 0xbe68) },
+
+	{}
+};
+
+MODULE_DEVICE_TABLE(hid, winwing_devices);
+
+static struct hid_driver winwing_driver = {
+	.name = "winwing",
+	.id_table = winwing_devices,
+	.probe = winwing_probe,
+	.input_configured = winwing_input_configured,
+	.report_fixup = winwing_report_fixup,
+	.raw_event = winwing_raw_event,
+};
+module_hid_driver(winwing_driver);
+
+MODULE_LICENSE("GPL");
--
2.25.1