1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for Phoenix RC Flight Controller Adapter
5 * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com>
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/uaccess.h>
14 #include <linux/usb.h>
15 #include <linux/usb/input.h>
16 #include <linux/mutex.h>
17 #include <linux/input.h>
19 #define PXRC_VENDOR_ID (0x1781)
20 #define PXRC_PRODUCT_ID (0x0898)
22 static const struct usb_device_id pxrc_table[] = {
23 { USB_DEVICE(PXRC_VENDOR_ID, PXRC_PRODUCT_ID) },
26 MODULE_DEVICE_TABLE(usb, pxrc_table);
29 struct input_dev *input;
30 struct usb_device *udev;
31 struct usb_interface *intf;
33 struct mutex pm_mutex;
41 static void pxrc_usb_irq(struct urb *urb)
43 struct pxrc *pxrc = urb->context;
46 switch (urb->status) {
51 /* this urb is timing out */
52 dev_dbg(&pxrc->intf->dev,
53 "%s - urb timed out - was the device unplugged?\n",
60 /* this urb is terminated, clean up */
61 dev_dbg(&pxrc->intf->dev, "%s - urb shutting down with status: %d\n",
62 __func__, urb->status);
65 dev_dbg(&pxrc->intf->dev, "%s - nonzero urb status received: %d\n",
66 __func__, urb->status);
70 if (urb->actual_length == 8) {
71 input_report_abs(pxrc->input, ABS_X, pxrc->data[0]);
72 input_report_abs(pxrc->input, ABS_Y, pxrc->data[2]);
73 input_report_abs(pxrc->input, ABS_RX, pxrc->data[3]);
74 input_report_abs(pxrc->input, ABS_RY, pxrc->data[4]);
75 input_report_abs(pxrc->input, ABS_RUDDER, pxrc->data[5]);
76 input_report_abs(pxrc->input, ABS_THROTTLE, pxrc->data[6]);
77 input_report_abs(pxrc->input, ABS_MISC, pxrc->data[7]);
79 input_report_key(pxrc->input, BTN_A, pxrc->data[1]);
83 /* Resubmit to fetch new fresh URBs */
84 error = usb_submit_urb(urb, GFP_ATOMIC);
85 if (error && error != -EPERM)
86 dev_err(&pxrc->intf->dev,
87 "%s - usb_submit_urb failed with result: %d",
91 static int pxrc_open(struct input_dev *input)
93 struct pxrc *pxrc = input_get_drvdata(input);
96 mutex_lock(&pxrc->pm_mutex);
97 retval = usb_submit_urb(pxrc->urb, GFP_KERNEL);
99 dev_err(&pxrc->intf->dev,
100 "%s - usb_submit_urb failed, error: %d\n",
106 pxrc->is_open = true;
109 mutex_unlock(&pxrc->pm_mutex);
113 static void pxrc_close(struct input_dev *input)
115 struct pxrc *pxrc = input_get_drvdata(input);
117 mutex_lock(&pxrc->pm_mutex);
118 usb_kill_urb(pxrc->urb);
119 pxrc->is_open = false;
120 mutex_unlock(&pxrc->pm_mutex);
123 static int pxrc_usb_init(struct pxrc *pxrc)
125 struct usb_endpoint_descriptor *epirq;
129 /* Set up the endpoint information */
130 /* This device only has an interrupt endpoint */
131 retval = usb_find_common_endpoints(pxrc->intf->cur_altsetting,
132 NULL, NULL, &epirq, NULL);
134 dev_err(&pxrc->intf->dev,
135 "Could not find endpoint\n");
139 pxrc->bsize = usb_endpoint_maxp(epirq);
140 pxrc->epaddr = epirq->bEndpointAddress;
141 pxrc->data = devm_kmalloc(&pxrc->intf->dev, pxrc->bsize, GFP_KERNEL);
147 usb_set_intfdata(pxrc->intf, pxrc);
148 usb_make_path(pxrc->udev, pxrc->phys, sizeof(pxrc->phys));
149 strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys));
151 pxrc->urb = usb_alloc_urb(0, GFP_KERNEL);
157 pipe = usb_rcvintpipe(pxrc->udev, pxrc->epaddr),
158 usb_fill_int_urb(pxrc->urb, pxrc->udev, pipe, pxrc->data, pxrc->bsize,
159 pxrc_usb_irq, pxrc, 1);
167 static int pxrc_input_init(struct pxrc *pxrc)
169 pxrc->input = devm_input_allocate_device(&pxrc->intf->dev);
170 if (pxrc->input == NULL) {
171 dev_err(&pxrc->intf->dev, "couldn't allocate input device\n");
175 pxrc->input->name = "PXRC Flight Controller Adapter";
176 pxrc->input->phys = pxrc->phys;
177 usb_to_input_id(pxrc->udev, &pxrc->input->id);
179 pxrc->input->open = pxrc_open;
180 pxrc->input->close = pxrc_close;
182 input_set_capability(pxrc->input, EV_KEY, BTN_A);
183 input_set_abs_params(pxrc->input, ABS_X, 0, 255, 0, 0);
184 input_set_abs_params(pxrc->input, ABS_Y, 0, 255, 0, 0);
185 input_set_abs_params(pxrc->input, ABS_RX, 0, 255, 0, 0);
186 input_set_abs_params(pxrc->input, ABS_RY, 0, 255, 0, 0);
187 input_set_abs_params(pxrc->input, ABS_RUDDER, 0, 255, 0, 0);
188 input_set_abs_params(pxrc->input, ABS_THROTTLE, 0, 255, 0, 0);
189 input_set_abs_params(pxrc->input, ABS_MISC, 0, 255, 0, 0);
191 input_set_drvdata(pxrc->input, pxrc);
193 return input_register_device(pxrc->input);
196 static int pxrc_probe(struct usb_interface *intf,
197 const struct usb_device_id *id)
202 pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
206 mutex_init(&pxrc->pm_mutex);
207 pxrc->udev = usb_get_dev(interface_to_usbdev(intf));
210 retval = pxrc_usb_init(pxrc);
214 retval = pxrc_input_init(pxrc);
221 usb_free_urb(pxrc->urb);
227 static void pxrc_disconnect(struct usb_interface *intf)
229 struct pxrc *pxrc = usb_get_intfdata(intf);
231 usb_free_urb(pxrc->urb);
232 usb_set_intfdata(intf, NULL);
235 static int pxrc_suspend(struct usb_interface *intf, pm_message_t message)
237 struct pxrc *pxrc = usb_get_intfdata(intf);
239 mutex_lock(&pxrc->pm_mutex);
241 usb_kill_urb(pxrc->urb);
242 mutex_unlock(&pxrc->pm_mutex);
247 static int pxrc_resume(struct usb_interface *intf)
249 struct pxrc *pxrc = usb_get_intfdata(intf);
252 mutex_lock(&pxrc->pm_mutex);
253 if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
256 mutex_unlock(&pxrc->pm_mutex);
260 static int pxrc_pre_reset(struct usb_interface *intf)
262 struct pxrc *pxrc = usb_get_intfdata(intf);
264 mutex_lock(&pxrc->pm_mutex);
265 usb_kill_urb(pxrc->urb);
269 static int pxrc_post_reset(struct usb_interface *intf)
271 struct pxrc *pxrc = usb_get_intfdata(intf);
274 if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
277 mutex_unlock(&pxrc->pm_mutex);
282 static int pxrc_reset_resume(struct usb_interface *intf)
284 return pxrc_resume(intf);
287 static struct usb_driver pxrc_driver = {
290 .disconnect = pxrc_disconnect,
291 .id_table = pxrc_table,
292 .suspend = pxrc_suspend,
293 .resume = pxrc_resume,
294 .pre_reset = pxrc_pre_reset,
295 .post_reset = pxrc_post_reset,
296 .reset_resume = pxrc_reset_resume,
299 module_usb_driver(pxrc_driver);
301 MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
302 MODULE_DESCRIPTION("PhoenixRC Flight Controller Adapter");
303 MODULE_LICENSE("GPL v2");