2018-03-17 21:00:58 +03:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for Phoenix RC Flight Controller Adapter
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*
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* Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com>
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include <linux/mutex.h>
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#include <linux/input.h>
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2018-07-18 21:37:47 +03:00
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#define PXRC_VENDOR_ID 0x1781
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#define PXRC_PRODUCT_ID 0x0898
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2018-03-17 21:00:58 +03:00
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struct pxrc {
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struct input_dev *input;
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struct usb_interface *intf;
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struct urb *urb;
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struct mutex pm_mutex;
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bool is_open;
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char phys[64];
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};
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static void pxrc_usb_irq(struct urb *urb)
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{
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struct pxrc *pxrc = urb->context;
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2018-07-18 21:24:27 +03:00
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u8 *data = urb->transfer_buffer;
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2018-03-17 21:00:58 +03:00
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int error;
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switch (urb->status) {
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case 0:
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/* success */
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break;
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case -ETIME:
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/* this urb is timing out */
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dev_dbg(&pxrc->intf->dev,
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"%s - urb timed out - was the device unplugged?\n",
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__func__);
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return;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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case -EPIPE:
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/* this urb is terminated, clean up */
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dev_dbg(&pxrc->intf->dev, "%s - urb shutting down with status: %d\n",
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__func__, urb->status);
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return;
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default:
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dev_dbg(&pxrc->intf->dev, "%s - nonzero urb status received: %d\n",
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__func__, urb->status);
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goto exit;
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}
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if (urb->actual_length == 8) {
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2018-07-18 21:24:27 +03:00
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input_report_abs(pxrc->input, ABS_X, data[0]);
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input_report_abs(pxrc->input, ABS_Y, data[2]);
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input_report_abs(pxrc->input, ABS_RX, data[3]);
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input_report_abs(pxrc->input, ABS_RY, data[4]);
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input_report_abs(pxrc->input, ABS_RUDDER, data[5]);
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input_report_abs(pxrc->input, ABS_THROTTLE, data[6]);
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input_report_abs(pxrc->input, ABS_MISC, data[7]);
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input_report_key(pxrc->input, BTN_A, data[1]);
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2018-03-17 21:00:58 +03:00
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}
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exit:
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/* Resubmit to fetch new fresh URBs */
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error = usb_submit_urb(urb, GFP_ATOMIC);
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if (error && error != -EPERM)
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dev_err(&pxrc->intf->dev,
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"%s - usb_submit_urb failed with result: %d",
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__func__, error);
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}
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static int pxrc_open(struct input_dev *input)
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{
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struct pxrc *pxrc = input_get_drvdata(input);
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int retval;
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mutex_lock(&pxrc->pm_mutex);
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retval = usb_submit_urb(pxrc->urb, GFP_KERNEL);
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if (retval) {
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dev_err(&pxrc->intf->dev,
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"%s - usb_submit_urb failed, error: %d\n",
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__func__, retval);
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retval = -EIO;
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goto out;
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}
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pxrc->is_open = true;
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out:
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mutex_unlock(&pxrc->pm_mutex);
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return retval;
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}
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static void pxrc_close(struct input_dev *input)
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{
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struct pxrc *pxrc = input_get_drvdata(input);
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mutex_lock(&pxrc->pm_mutex);
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usb_kill_urb(pxrc->urb);
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pxrc->is_open = false;
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mutex_unlock(&pxrc->pm_mutex);
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}
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2018-07-18 21:03:36 +03:00
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static void pxrc_free_urb(void *_pxrc)
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{
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struct pxrc *pxrc = _pxrc;
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usb_free_urb(pxrc->urb);
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}
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2018-07-18 21:37:47 +03:00
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static int pxrc_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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2018-03-17 21:00:58 +03:00
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{
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2018-07-18 21:37:47 +03:00
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struct usb_device *udev = interface_to_usbdev(intf);
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struct pxrc *pxrc;
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2018-03-17 21:00:58 +03:00
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struct usb_endpoint_descriptor *epirq;
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2018-07-18 21:24:27 +03:00
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size_t xfer_size;
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void *xfer_buf;
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2018-07-18 21:03:36 +03:00
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int error;
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2018-03-17 21:00:58 +03:00
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2018-07-18 21:37:47 +03:00
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/*
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* Locate the endpoint information. This device only has an
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* interrupt endpoint.
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*/
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error = usb_find_common_endpoints(intf->cur_altsetting,
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2018-07-18 21:03:36 +03:00
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NULL, NULL, &epirq, NULL);
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if (error) {
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2018-07-18 21:37:47 +03:00
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dev_err(&intf->dev, "Could not find endpoint\n");
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2018-07-18 21:03:36 +03:00
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return error;
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2018-03-17 21:00:58 +03:00
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}
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2018-07-18 21:37:47 +03:00
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pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
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if (!pxrc)
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2018-07-18 21:03:36 +03:00
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return -ENOMEM;
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2018-03-17 21:00:58 +03:00
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2018-07-18 21:37:47 +03:00
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mutex_init(&pxrc->pm_mutex);
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pxrc->intf = intf;
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2018-03-17 21:00:58 +03:00
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usb_set_intfdata(pxrc->intf, pxrc);
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2018-07-18 21:37:47 +03:00
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xfer_size = usb_endpoint_maxp(epirq);
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xfer_buf = devm_kmalloc(&intf->dev, xfer_size, GFP_KERNEL);
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if (!xfer_buf)
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return -ENOMEM;
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2018-03-17 21:00:58 +03:00
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pxrc->urb = usb_alloc_urb(0, GFP_KERNEL);
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2018-07-18 21:03:36 +03:00
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if (!pxrc->urb)
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return -ENOMEM;
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2018-07-18 21:37:47 +03:00
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error = devm_add_action_or_reset(&intf->dev, pxrc_free_urb, pxrc);
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2018-07-18 21:03:36 +03:00
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if (error)
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return error;
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2018-03-17 21:00:58 +03:00
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2018-07-18 21:37:47 +03:00
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usb_fill_int_urb(pxrc->urb, udev,
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usb_rcvintpipe(udev, epirq->bEndpointAddress),
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xfer_buf, xfer_size, pxrc_usb_irq, pxrc, 1);
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2018-03-17 21:00:58 +03:00
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2018-07-18 21:37:47 +03:00
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pxrc->input = devm_input_allocate_device(&intf->dev);
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if (!pxrc->input) {
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dev_err(&intf->dev, "couldn't allocate input device\n");
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2018-03-17 21:00:58 +03:00
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return -ENOMEM;
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}
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pxrc->input->name = "PXRC Flight Controller Adapter";
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2018-07-18 21:37:47 +03:00
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usb_make_path(udev, pxrc->phys, sizeof(pxrc->phys));
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strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys));
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2018-03-17 21:00:58 +03:00
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pxrc->input->phys = pxrc->phys;
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2018-07-18 21:37:47 +03:00
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usb_to_input_id(udev, &pxrc->input->id);
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2018-03-17 21:00:58 +03:00
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pxrc->input->open = pxrc_open;
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pxrc->input->close = pxrc_close;
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input_set_capability(pxrc->input, EV_KEY, BTN_A);
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input_set_abs_params(pxrc->input, ABS_X, 0, 255, 0, 0);
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input_set_abs_params(pxrc->input, ABS_Y, 0, 255, 0, 0);
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input_set_abs_params(pxrc->input, ABS_RX, 0, 255, 0, 0);
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input_set_abs_params(pxrc->input, ABS_RY, 0, 255, 0, 0);
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input_set_abs_params(pxrc->input, ABS_RUDDER, 0, 255, 0, 0);
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input_set_abs_params(pxrc->input, ABS_THROTTLE, 0, 255, 0, 0);
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input_set_abs_params(pxrc->input, ABS_MISC, 0, 255, 0, 0);
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input_set_drvdata(pxrc->input, pxrc);
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2018-07-18 21:37:47 +03:00
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error = input_register_device(pxrc->input);
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2018-07-18 21:03:36 +03:00
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if (error)
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return error;
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2018-03-17 21:00:58 +03:00
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return 0;
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}
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static void pxrc_disconnect(struct usb_interface *intf)
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{
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2018-07-18 21:03:36 +03:00
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/* All driver resources are devm-managed. */
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2018-03-17 21:00:58 +03:00
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}
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static int pxrc_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct pxrc *pxrc = usb_get_intfdata(intf);
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mutex_lock(&pxrc->pm_mutex);
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if (pxrc->is_open)
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usb_kill_urb(pxrc->urb);
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mutex_unlock(&pxrc->pm_mutex);
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return 0;
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}
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static int pxrc_resume(struct usb_interface *intf)
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{
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struct pxrc *pxrc = usb_get_intfdata(intf);
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int retval = 0;
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mutex_lock(&pxrc->pm_mutex);
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if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
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retval = -EIO;
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mutex_unlock(&pxrc->pm_mutex);
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return retval;
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}
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static int pxrc_pre_reset(struct usb_interface *intf)
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{
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struct pxrc *pxrc = usb_get_intfdata(intf);
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mutex_lock(&pxrc->pm_mutex);
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usb_kill_urb(pxrc->urb);
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return 0;
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}
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static int pxrc_post_reset(struct usb_interface *intf)
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{
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struct pxrc *pxrc = usb_get_intfdata(intf);
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int retval = 0;
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if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
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retval = -EIO;
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mutex_unlock(&pxrc->pm_mutex);
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return retval;
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}
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static int pxrc_reset_resume(struct usb_interface *intf)
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{
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return pxrc_resume(intf);
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}
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2018-07-18 21:12:12 +03:00
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static const struct usb_device_id pxrc_table[] = {
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{ USB_DEVICE(PXRC_VENDOR_ID, PXRC_PRODUCT_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, pxrc_table);
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2018-03-17 21:00:58 +03:00
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static struct usb_driver pxrc_driver = {
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.name = "pxrc",
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.probe = pxrc_probe,
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.disconnect = pxrc_disconnect,
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.id_table = pxrc_table,
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.suspend = pxrc_suspend,
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.resume = pxrc_resume,
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.pre_reset = pxrc_pre_reset,
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.post_reset = pxrc_post_reset,
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.reset_resume = pxrc_reset_resume,
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};
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module_usb_driver(pxrc_driver);
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MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
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MODULE_DESCRIPTION("PhoenixRC Flight Controller Adapter");
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MODULE_LICENSE("GPL v2");
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