Input: pxrc - new driver for PhoenixRC Flight Controller Adapter

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>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/input/devices/pxrc.rst b/Documentation/input/devices/pxrc.rst
new file mode 100644 (file)
index 0000000..ca11f64
--- /dev/null
+++ b/Documentation/input/devices/pxrc.rst
@@ -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/

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index f3c2f6e..9591fc0 100644 (file)
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -351,4 +351,14 @@ 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

diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index 67651ef..dd0492e 100644 (file)
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -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

diff --git a/drivers/input/joystick/pxrc.c b/drivers/input/joystick/pxrc.c
new file mode 100644 (file)
index 0000000..07a0dbd
--- /dev/null
+++ b/drivers/input/joystick/pxrc.c
@@ -0,0 +1,303 @@
+// 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;
+       struct mutex            pm_mutex;
+       bool                    is_open;
+       __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:
+       /* 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;
+
+       mutex_lock(&pxrc->pm_mutex);
+       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->is_open = true;
+
+out:
+       mutex_unlock(&pxrc->pm_mutex);
+       return retval;
+}
+
+static void pxrc_close(struct input_dev *input)
+{
+       struct pxrc *pxrc = input_get_drvdata(input);
+
+       mutex_lock(&pxrc->pm_mutex);
+       usb_kill_urb(pxrc->urb);
+       pxrc->is_open = false;
+       mutex_unlock(&pxrc->pm_mutex);
+}
+
+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;
+
+       mutex_init(&pxrc->pm_mutex);
+       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);
+
+       mutex_lock(&pxrc->pm_mutex);
+       if (pxrc->is_open)
+               usb_kill_urb(pxrc->urb);
+       mutex_unlock(&pxrc->pm_mutex);
+
+       return 0;
+}
+
+static int pxrc_resume(struct usb_interface *intf)
+{
+       struct pxrc *pxrc = usb_get_intfdata(intf);
+       int retval = 0;
+
+       mutex_lock(&pxrc->pm_mutex);
+       if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
+               retval = -EIO;
+
+       mutex_unlock(&pxrc->pm_mutex);
+       return retval;
+}
+
+static int pxrc_pre_reset(struct usb_interface *intf)
+{
+       struct pxrc *pxrc = usb_get_intfdata(intf);
+
+       mutex_lock(&pxrc->pm_mutex);
+       usb_kill_urb(pxrc->urb);
+       return 0;
+}
+
+static int pxrc_post_reset(struct usb_interface *intf)
+{
+       struct pxrc *pxrc = usb_get_intfdata(intf);
+       int retval = 0;
+
+       if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
+               retval = -EIO;
+
+       mutex_unlock(&pxrc->pm_mutex);
+
+       return retval;
+}
+
+static int pxrc_reset_resume(struct usb_interface *intf)
+{
+       return pxrc_resume(intf);
+}
+
+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,
+};
+
+module_usb_driver(pxrc_driver);
+
+MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
+MODULE_DESCRIPTION("PhoenixRC Flight Controller Adapter");
+MODULE_LICENSE("GPL v2");