HID: Add driver for PhoenixRC Flight Controller

The PhoenixRC is a controller with 8 channels for use in flight
simulators.

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220914184345.270456-1-marcus.folkesson@gmail.com

5 files changed, 129 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 40aae61d73a9..8a7b24622b98 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9053,6 +9053,12 @@ L:	linux-input@vger.kernel.org
 S:	Supported
 F:	drivers/hid/hid-playstation.c
 
+HID PHOENIX RC FLIGHT CONTROLLER
+M:	Marcus Folkesson <marcus.folkesson@gmail.com>
+L:	linux-input@vger.kernel.org
+S:	Maintained
+F:	drivers/hid/hid-pxrc.c
+
 HID SENSOR HUB DRIVERS
 M:	Jiri Kosina <jikos@kernel.org>
 M:	Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index f051d29ae4f8..4cdc44da2abf 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -960,6 +960,15 @@ config PLAYSTATION_FF
 	  Say Y here if you would like to enable force feedback support for
 	  PlayStation game controllers.
 
+config HID_PXRC
+       tristate "PhoenixRC HID Flight Controller"
+       depends on HID
+       help
+       Support for PhoenixRC HID Flight Controller, a 8-axis flight controller.
+
+       To compile this driver as a module, choose M here: the
+       module will be called hid-pxrc.
+
 config HID_RAZER
 	tristate "Razer non-fully HID-compliant devices"
 	depends on HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index be4f78d6482f..ad2cdaefb4bd 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -101,6 +101,7 @@ hid-picolcd-$(CONFIG_DEBUG_FS)		+= hid-picolcd_debugfs.o
 obj-$(CONFIG_HID_PLANTRONICS)	+= hid-plantronics.o
 obj-$(CONFIG_HID_PLAYSTATION)	+= hid-playstation.o
 obj-$(CONFIG_HID_PRIMAX)	+= hid-primax.o
+obj-$(CONFIG_HID_PXRC)		+= hid-pxrc.o
 obj-$(CONFIG_HID_RAZER)	+= hid-razer.o
 obj-$(CONFIG_HID_REDRAGON)	+= hid-redragon.o
 obj-$(CONFIG_HID_RETRODE)	+= hid-retrode.o
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index f80d6193fca6..b22b2f80e30c 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -1386,6 +1386,7 @@
 
 #define USB_VENDOR_ID_MULTIPLE_1781	0x1781
 #define USB_DEVICE_ID_RAPHNET_4NES4SNES_OLD	0x0a9d
+#define USB_DEVICE_ID_PHOENIXRC        0x0898
 
 #define USB_VENDOR_ID_DRACAL_RAPHNET	0x289b
 #define USB_DEVICE_ID_RAPHNET_2NES2SNES	0x0002
diff --git a/drivers/hid/hid-pxrc.c b/drivers/hid/hid-pxrc.c
new file mode 100644
index 000000000000..b0e517f9cde7
--- /dev/null
+++ b/drivers/hid/hid-pxrc.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * HID driver for PhoenixRC 8-axis flight controller
+ *
+ * Copyright (C) 2022 Marcus Folkesson <marcus.folkesson@gmail.com>
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+struct pxrc_priv {
+	u8 slider;
+	u8 dial;
+	bool alternate;
+};
+
+static __u8 pxrc_rdesc_fixed[] = {
+	0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
+	0x09, 0x04,        // Usage (Joystick)
+	0xA1, 0x01,        // Collection (Application)
+	0x09, 0x01,        //   Usage (Pointer)
+	0xA1, 0x00,        //   Collection (Physical)
+	0x09, 0x30,        //     Usage (X)
+	0x09, 0x36,        //     Usage (Slider)
+	0x09, 0x31,        //     Usage (Y)
+	0x09, 0x32,        //     Usage (Z)
+	0x09, 0x33,        //     Usage (Rx)
+	0x09, 0x34,        //     Usage (Ry)
+	0x09, 0x35,        //     Usage (Rz)
+	0x09, 0x37,        //     Usage (Dial)
+	0x15, 0x00,        //     Logical Minimum (0)
+	0x26, 0xFF, 0x00,  //     Logical Maximum (255)
+	0x35, 0x00,        //     Physical Minimum (0)
+	0x46, 0xFF, 0x00,  //     Physical Maximum (255)
+	0x75, 0x08,        //     Report Size (8)
+	0x95, 0x08,        //     Report Count (8)
+	0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+	0xC0,              //   End Collection
+	0xC0,              // End Collection
+};
+
+static __u8 *pxrc_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+				unsigned int *rsize)
+{
+	hid_info(hdev, "fixing up PXRC report descriptor\n");
+	*rsize = sizeof(pxrc_rdesc_fixed);
+	return pxrc_rdesc_fixed;
+}
+
+static int pxrc_raw_event(struct hid_device *hdev, struct hid_report *report,
+	 u8 *data, int size)
+{
+	struct pxrc_priv *priv = hid_get_drvdata(hdev);
+
+	if (priv->alternate)
+		priv->slider = data[7];
+	else
+		priv->dial = data[7];
+
+	data[1] = priv->slider;
+	data[7] = priv->dial;
+
+	priv->alternate = !priv->alternate;
+	return 0;
+}
+
+static int pxrc_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int ret;
+	struct pxrc_priv *priv;
+
+	priv = devm_kzalloc(&hdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	hid_set_drvdata(hdev, priv);
+
+	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;
+	}
+
+	return 0;
+}
+
+static const struct hid_device_id pxrc_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_MULTIPLE_1781, USB_DEVICE_ID_PHOENIXRC) },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(hid, pxrc_devices);
+
+static struct hid_driver pxrc_driver = {
+	.name = "hid-pxrc",
+	.id_table = pxrc_devices,
+	.report_fixup = pxrc_report_fixup,
+	.probe = pxrc_probe,
+	.raw_event = pxrc_raw_event,
+};
+module_hid_driver(pxrc_driver);
+
+MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
+MODULE_DESCRIPTION("HID driver for PXRC 8-axis flight controller");
+MODULE_LICENSE("GPL");