new file mode 100644
@@ -0,0 +1,57 @@
+=======================================================
+pxrc - PhoenixRC Flight Controller Adapter
+=======================================================
+
+:Author: Marcus Folkesson <marcus.folkesson@gmail.com>
+
+This driver let you use your own RC controller plugged into the
+adapter that comes with PhoenixRC [1]_ or other compatible adapters.
+
+The adapter supports 7 analog channels and 1 digital input switch.
+
+Notes
+=====
+
+Many RC controllers is able to configure which stick goes to which channel.
+This is also configurable in most simulators, so a matching is not necessary.
+
+The driver is generating the following input event for analog channels:
+
++---------+----------------+
+| Channel | Event |
++=========+================+
+| 1 | ABS_X |
++---------+----------------+
+| 2 | ABS_Y |
++---------+----------------+
+| 3 | ABS_RX |
++---------+----------------+
+| 4 | ABS_RY |
++---------+----------------+
+| 5 | ABS_RUDDER |
++---------+----------------+
+| 6 | ABS_THROTTLE |
++---------+----------------+
+| 7 | ABS_MISC |
++---------+----------------+
+
+The digital input switch is generated as an `BTN_A` event.
+
+Manual Testing
+==============
+
+To test this driver's functionality you may use `input-event` which is part of
+the `input layer utilities` suite [2]_.
+
+For example::
+
+ > modprobe pxrc
+ > input-events <devnr>
+
+To print all input events from input `devnr`.
+
+References
+==========
+
+.. [1] http://www.phoenix-sim.com/
+.. [2] https://www.kraxel.org/cgit/input/
@@ -351,4 +351,13 @@ config JOYSTICK_PSXPAD_SPI_FF
To drive rumble motor a dedicated power supply is required.
+config JOYSTICK_PXRC
+ tristate "PhoenixRC Flight Controller Adapter"
+ depends on USB_ARCH_HAS_HCD
+ select USB
+ help
+ Say Y here if you want to use the PhoenixRC Flight Controller Adapter.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pxrc.
endif
@@ -23,6 +23,7 @@ obj-$(CONFIG_JOYSTICK_JOYDUMP) += joydump.o
obj-$(CONFIG_JOYSTICK_MAGELLAN) += magellan.o
obj-$(CONFIG_JOYSTICK_MAPLE) += maplecontrol.o
obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o
+obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o
obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o
obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o
obj-$(CONFIG_JOYSTICK_SPACEORB) += spaceorb.o
new file mode 100644
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Phoenix RC Flight Controller Adapter
+ *
+ * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <linux/mutex.h>
+#include <linux/input.h>
+
+#define PXRC_VENDOR_ID (0x1781)
+#define PXRC_PRODUCT_ID (0x0898)
+
+static const struct usb_device_id pxrc_table[] = {
+ { USB_DEVICE(PXRC_VENDOR_ID, PXRC_PRODUCT_ID) },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, pxrc_table);
+
+struct pxrc {
+ struct input_dev *input;
+ struct usb_device *udev;
+ struct usb_interface *intf;
+ struct urb *urb;
+ __u8 epaddr;
+ char phys[64];
+ unsigned char *data;
+ size_t bsize;
+};
+
+static void pxrc_usb_irq(struct urb *urb)
+{
+ struct pxrc *pxrc = urb->context;
+ int error;
+
+ switch (urb->status) {
+ case 0:
+ /* success */
+ break;
+ case -ETIME:
+ /* this urb is timing out */
+ dev_dbg(&pxrc->intf->dev,
+ "%s - urb timed out - was the device unplugged?\n",
+ __func__);
+ return;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ case -EPIPE:
+ /* this urb is terminated, clean up */
+ dev_dbg(&pxrc->intf->dev, "%s - urb shutting down with status: %d\n",
+ __func__, urb->status);
+ return;
+ default:
+ dev_dbg(&pxrc->intf->dev, "%s - nonzero urb status received: %d\n",
+ __func__, urb->status);
+ goto exit;
+ }
+
+ if (urb->actual_length == 8) {
+ input_report_abs(pxrc->input, ABS_X, pxrc->data[0]);
+ input_report_abs(pxrc->input, ABS_Y, pxrc->data[2]);
+ input_report_abs(pxrc->input, ABS_RX, pxrc->data[3]);
+ input_report_abs(pxrc->input, ABS_RY, pxrc->data[4]);
+ input_report_abs(pxrc->input, ABS_RUDDER, pxrc->data[5]);
+ input_report_abs(pxrc->input, ABS_THROTTLE, pxrc->data[6]);
+ input_report_abs(pxrc->input, ABS_MISC, pxrc->data[7]);
+
+ input_report_key(pxrc->input, BTN_A, pxrc->data[1]);
+ }
+
+exit:
+ usb_mark_last_busy(interface_to_usbdev(pxrc->intf));
+
+ /* Resubmit to fetch new fresh URBs */
+ error = usb_submit_urb(urb, GFP_ATOMIC);
+ if (error && error != -EPERM)
+ dev_err(&pxrc->intf->dev,
+ "%s - usb_submit_urb failed with result: %d",
+ __func__, error);
+}
+
+static int pxrc_open(struct input_dev *input)
+{
+ struct pxrc *pxrc = input_get_drvdata(input);
+ int retval;
+
+ retval = usb_autopm_get_interface(pxrc->intf);
+ if (retval) {
+ dev_err(&pxrc->intf->dev,
+ "%s - usb_autopm_get_interface failed, error: %d\n",
+ __func__, retval);
+ return retval;
+ }
+
+ retval = usb_submit_urb(pxrc->urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(&pxrc->intf->dev,
+ "%s - usb_submit_urb failed, error: %d\n",
+ __func__, retval);
+ retval = -EIO;
+ goto out;
+ }
+
+ pxrc->intf->needs_remote_wakeup = 1;
+
+out:
+ usb_autopm_put_interface(pxrc->intf);
+ return retval;
+}
+
+static void pxrc_close(struct input_dev *input)
+{
+ struct pxrc *pxrc = input_get_drvdata(input);
+ int autopm_error;
+
+ autopm_error = usb_autopm_get_interface(pxrc->intf);
+
+ usb_kill_urb(pxrc->urb);
+ pxrc->intf->needs_remote_wakeup = 0;
+
+ if (!autopm_error)
+ usb_autopm_put_interface(pxrc->intf);
+}
+
+static int pxrc_usb_init(struct pxrc *pxrc)
+{
+ struct usb_endpoint_descriptor *epirq;
+ unsigned int pipe;
+ int retval;
+
+ /* Set up the endpoint information */
+ /* This device only has an interrupt endpoint */
+ retval = usb_find_common_endpoints(pxrc->intf->cur_altsetting,
+ NULL, NULL, &epirq, NULL);
+ if (retval) {
+ dev_err(&pxrc->intf->dev,
+ "Could not find endpoint\n");
+ goto error;
+ }
+
+ pxrc->bsize = usb_endpoint_maxp(epirq);
+ pxrc->epaddr = epirq->bEndpointAddress;
+ pxrc->data = devm_kmalloc(&pxrc->intf->dev, pxrc->bsize, GFP_KERNEL);
+ if (!pxrc->data) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ usb_set_intfdata(pxrc->intf, pxrc);
+ usb_make_path(pxrc->udev, pxrc->phys, sizeof(pxrc->phys));
+ strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys));
+
+ pxrc->urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!pxrc->urb) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ pipe = usb_rcvintpipe(pxrc->udev, pxrc->epaddr),
+ usb_fill_int_urb(pxrc->urb, pxrc->udev, pipe, pxrc->data, pxrc->bsize,
+ pxrc_usb_irq, pxrc, 1);
+
+error:
+ return retval;
+
+
+}
+
+static int pxrc_input_init(struct pxrc *pxrc)
+{
+ pxrc->input = devm_input_allocate_device(&pxrc->intf->dev);
+ if (pxrc->input == NULL) {
+ dev_err(&pxrc->intf->dev, "couldn't allocate input device\n");
+ return -ENOMEM;
+ }
+
+ pxrc->input->name = "PXRC Flight Controller Adapter";
+ pxrc->input->phys = pxrc->phys;
+ usb_to_input_id(pxrc->udev, &pxrc->input->id);
+
+ pxrc->input->open = pxrc_open;
+ pxrc->input->close = pxrc_close;
+
+ input_set_capability(pxrc->input, EV_KEY, BTN_A);
+ input_set_abs_params(pxrc->input, ABS_X, 0, 255, 0, 0);
+ input_set_abs_params(pxrc->input, ABS_Y, 0, 255, 0, 0);
+ input_set_abs_params(pxrc->input, ABS_RX, 0, 255, 0, 0);
+ input_set_abs_params(pxrc->input, ABS_RY, 0, 255, 0, 0);
+ input_set_abs_params(pxrc->input, ABS_RUDDER, 0, 255, 0, 0);
+ input_set_abs_params(pxrc->input, ABS_THROTTLE, 0, 255, 0, 0);
+ input_set_abs_params(pxrc->input, ABS_MISC, 0, 255, 0, 0);
+
+ input_set_drvdata(pxrc->input, pxrc);
+
+ return input_register_device(pxrc->input);
+}
+
+static int pxrc_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct pxrc *pxrc;
+ int retval;
+
+ pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
+
+ if (!pxrc)
+ return -ENOMEM;
+
+ pxrc->udev = usb_get_dev(interface_to_usbdev(intf));
+ pxrc->intf = intf;
+
+ retval = pxrc_usb_init(pxrc);
+ if (retval)
+ goto error;
+
+ retval = pxrc_input_init(pxrc);
+ if (retval)
+ goto err_free_urb;
+
+ return 0;
+
+err_free_urb:
+ usb_free_urb(pxrc->urb);
+
+error:
+ return retval;
+}
+
+static void pxrc_disconnect(struct usb_interface *intf)
+{
+ struct pxrc *pxrc = usb_get_intfdata(intf);
+
+ usb_free_urb(pxrc->urb);
+ usb_set_intfdata(intf, NULL);
+}
+
+static int pxrc_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct pxrc *pxrc = usb_get_intfdata(intf);
+ struct input_dev *input_dev = pxrc->input;
+
+ mutex_lock(&input_dev->mutex);
+ usb_kill_urb(pxrc->urb);
+ mutex_unlock(&input_dev->mutex);
+
+ return 0;
+}
+
+static int pxrc_resume(struct usb_interface *intf)
+{
+ return 0;
+}
+
+static int pxrc_pre_reset(struct usb_interface *intf)
+{
+ struct pxrc *pxrc = usb_get_intfdata(intf);
+ struct input_dev *input_dev = pxrc->input;
+
+ mutex_lock(&input_dev->mutex);
+ usb_kill_urb(pxrc->urb);
+ return 0;
+}
+
+static int pxrc_post_reset(struct usb_interface *intf)
+{
+ struct pxrc *pxrc = usb_get_intfdata(intf);
+ struct input_dev *input_dev = pxrc->input;
+ int retval = 0;
+
+ if (input_dev->users && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
+ retval = -EIO;
+
+ mutex_unlock(&input_dev->mutex);
+
+ return retval;
+}
+
+static int pxrc_reset_resume(struct usb_interface *intf)
+{
+ struct pxrc *pxrc = usb_get_intfdata(intf);
+ struct input_dev *input_dev = pxrc->input;
+ int retval = 0;
+
+ mutex_lock(&input_dev->mutex);
+ if (input_dev->users && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
+ retval = -EIO;
+
+ mutex_unlock(&input_dev->mutex);
+ return retval;
+}
+
+static struct usb_driver pxrc_driver = {
+ .name = "pxrc",
+ .probe = pxrc_probe,
+ .disconnect = pxrc_disconnect,
+ .id_table = pxrc_table,
+ .suspend = pxrc_suspend,
+ .resume = pxrc_resume,
+ .pre_reset = pxrc_pre_reset,
+ .post_reset = pxrc_post_reset,
+ .reset_resume = pxrc_reset_resume,
+ .supports_autosuspend = 1,
+};
+
+module_usb_driver(pxrc_driver);
+
+MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
+MODULE_DESCRIPTION("PhoenixRC Flight Controller Adapter");
+MODULE_LICENSE("GPL v2");
This driver let you plug in your RC controller to the adapter and use it as input device in various RC simulators. Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com> --- v4: - Add call to usb_mark_last_busy() in irq - Move code from pxrc_resume() to pxrc_reset_resume() v3: - Use RUDDER and MISC instead of TILT_X and TILT_Y - Drop kref and anchor - Rework URB handling - Add PM support v2: - Change module license to GPLv2 to match SPDX tag Documentation/input/devices/pxrc.rst | 57 +++++++ drivers/input/joystick/Kconfig | 9 + drivers/input/joystick/Makefile | 1 + drivers/input/joystick/pxrc.c | 318 +++++++++++++++++++++++++++++++++++ 4 files changed, 385 insertions(+) create mode 100644 Documentation/input/devices/pxrc.rst create mode 100644 drivers/input/joystick/pxrc.c