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// 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)
struct pxrc {
struct input_dev *input;
struct usb_interface *intf;
struct urb *urb;
struct mutex pm_mutex;
bool is_open;
char phys[64];
};
static void pxrc_usb_irq(struct urb *urb)
{
struct pxrc *pxrc = urb->context;
u8 *data = urb->transfer_buffer;
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, data[0]);
input_report_abs(pxrc->input, ABS_Y, data[2]);
input_report_abs(pxrc->input, ABS_RX, data[3]);
input_report_abs(pxrc->input, ABS_RY, data[4]);
input_report_abs(pxrc->input, ABS_RUDDER, data[5]);
input_report_abs(pxrc->input, ABS_THROTTLE, data[6]);
input_report_abs(pxrc->input, ABS_MISC, data[7]);
input_report_key(pxrc->input, BTN_A, 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 void pxrc_free_urb(void *_pxrc)
{
struct pxrc *pxrc = _pxrc;
usb_free_urb(pxrc->urb);
}
static int pxrc_usb_init(struct pxrc *pxrc)
{
struct usb_device *udev = interface_to_usbdev(pxrc->intf);
struct usb_endpoint_descriptor *epirq;
size_t xfer_size;
void *xfer_buf;
unsigned int pipe;
int error;
/* Set up the endpoint information */
/* This device only has an interrupt endpoint */
error = usb_find_common_endpoints(pxrc->intf->cur_altsetting,
NULL, NULL, &epirq, NULL);
if (error) {
dev_err(&pxrc->intf->dev, "Could not find endpoint\n");
return error;
}
xfer_size = usb_endpoint_maxp(epirq);
xfer_buf = devm_kmalloc(&pxrc->intf->dev, xfer_size, GFP_KERNEL);
if (!xfer_buf)
return -ENOMEM;
usb_set_intfdata(pxrc->intf, pxrc);
usb_make_path(udev, pxrc->phys, sizeof(pxrc->phys));
strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys));
pxrc->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!pxrc->urb)
return -ENOMEM;
error = devm_add_action_or_reset(&pxrc->intf->dev, pxrc_free_urb, pxrc);
if (error)
return error;
pipe = usb_rcvintpipe(udev, epirq->bEndpointAddress),
usb_fill_int_urb(pxrc->urb, udev, pipe, xfer_buf, xfer_size,
pxrc_usb_irq, pxrc, 1);
return 0;
}
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(interface_to_usbdev(pxrc->intf), &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 error;
pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
if (!pxrc)
return -ENOMEM;
mutex_init(&pxrc->pm_mutex);
pxrc->intf = intf;
error = pxrc_usb_init(pxrc);
if (error)
return error;
error = pxrc_input_init(pxrc);
if (error)
return error;
return 0;
}
static void pxrc_disconnect(struct usb_interface *intf)
{
/* All driver resources are devm-managed. */
}
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 const struct usb_device_id pxrc_table[] = {
{ USB_DEVICE(PXRC_VENDOR_ID, PXRC_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, pxrc_table);
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");
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