xref: /openbmc/linux/drivers/input/joystick/pxrc.c (revision 76336b41)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Driver for Phoenix RC Flight Controller Adapter
4  *
5  * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com>
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/errno.h>
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/uaccess.h>
13 #include <linux/usb.h>
14 #include <linux/usb/input.h>
15 #include <linux/mutex.h>
16 #include <linux/input.h>
17 
18 #define PXRC_VENDOR_ID		0x1781
19 #define PXRC_PRODUCT_ID		0x0898
20 
21 struct pxrc {
22 	struct input_dev	*input;
23 	struct usb_interface	*intf;
24 	struct urb		*urb;
25 	struct mutex		pm_mutex;
26 	bool			is_open;
27 	char			phys[64];
28 };
29 
pxrc_usb_irq(struct urb * urb)30 static void pxrc_usb_irq(struct urb *urb)
31 {
32 	struct pxrc *pxrc = urb->context;
33 	u8 *data = urb->transfer_buffer;
34 	int error;
35 
36 	switch (urb->status) {
37 	case 0:
38 		/* success */
39 		break;
40 	case -ETIME:
41 		/* this urb is timing out */
42 		dev_dbg(&pxrc->intf->dev,
43 			"%s - urb timed out - was the device unplugged?\n",
44 			__func__);
45 		return;
46 	case -ECONNRESET:
47 	case -ENOENT:
48 	case -ESHUTDOWN:
49 	case -EPIPE:
50 		/* this urb is terminated, clean up */
51 		dev_dbg(&pxrc->intf->dev, "%s - urb shutting down with status: %d\n",
52 			__func__, urb->status);
53 		return;
54 	default:
55 		dev_dbg(&pxrc->intf->dev, "%s - nonzero urb status received: %d\n",
56 			__func__, urb->status);
57 		goto exit;
58 	}
59 
60 	if (urb->actual_length == 8) {
61 		input_report_abs(pxrc->input, ABS_X, data[0]);
62 		input_report_abs(pxrc->input, ABS_Y, data[2]);
63 		input_report_abs(pxrc->input, ABS_RX, data[3]);
64 		input_report_abs(pxrc->input, ABS_RY, data[4]);
65 		input_report_abs(pxrc->input, ABS_RUDDER, data[5]);
66 		input_report_abs(pxrc->input, ABS_THROTTLE, data[6]);
67 		input_report_abs(pxrc->input, ABS_MISC, data[7]);
68 
69 		input_report_key(pxrc->input, BTN_A, data[1]);
70 	}
71 
72 exit:
73 	/* Resubmit to fetch new fresh URBs */
74 	error = usb_submit_urb(urb, GFP_ATOMIC);
75 	if (error && error != -EPERM)
76 		dev_err(&pxrc->intf->dev,
77 			"%s - usb_submit_urb failed with result: %d",
78 			__func__, error);
79 }
80 
pxrc_open(struct input_dev * input)81 static int pxrc_open(struct input_dev *input)
82 {
83 	struct pxrc *pxrc = input_get_drvdata(input);
84 	int retval;
85 
86 	mutex_lock(&pxrc->pm_mutex);
87 	retval = usb_submit_urb(pxrc->urb, GFP_KERNEL);
88 	if (retval) {
89 		dev_err(&pxrc->intf->dev,
90 			"%s - usb_submit_urb failed, error: %d\n",
91 			__func__, retval);
92 		retval = -EIO;
93 		goto out;
94 	}
95 
96 	pxrc->is_open = true;
97 
98 out:
99 	mutex_unlock(&pxrc->pm_mutex);
100 	return retval;
101 }
102 
pxrc_close(struct input_dev * input)103 static void pxrc_close(struct input_dev *input)
104 {
105 	struct pxrc *pxrc = input_get_drvdata(input);
106 
107 	mutex_lock(&pxrc->pm_mutex);
108 	usb_kill_urb(pxrc->urb);
109 	pxrc->is_open = false;
110 	mutex_unlock(&pxrc->pm_mutex);
111 }
112 
pxrc_free_urb(void * _pxrc)113 static void pxrc_free_urb(void *_pxrc)
114 {
115 	struct pxrc *pxrc = _pxrc;
116 
117 	usb_free_urb(pxrc->urb);
118 }
119 
pxrc_probe(struct usb_interface * intf,const struct usb_device_id * id)120 static int pxrc_probe(struct usb_interface *intf,
121 		      const struct usb_device_id *id)
122 {
123 	struct usb_device *udev = interface_to_usbdev(intf);
124 	struct pxrc *pxrc;
125 	struct usb_endpoint_descriptor *epirq;
126 	size_t xfer_size;
127 	void *xfer_buf;
128 	int error;
129 
130 	/*
131 	 * Locate the endpoint information. This device only has an
132 	 * interrupt endpoint.
133 	 */
134 	error = usb_find_common_endpoints(intf->cur_altsetting,
135 					  NULL, NULL, &epirq, NULL);
136 	if (error) {
137 		dev_err(&intf->dev, "Could not find endpoint\n");
138 		return error;
139 	}
140 
141 	pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
142 	if (!pxrc)
143 		return -ENOMEM;
144 
145 	mutex_init(&pxrc->pm_mutex);
146 	pxrc->intf = intf;
147 
148 	usb_set_intfdata(pxrc->intf, pxrc);
149 
150 	xfer_size = usb_endpoint_maxp(epirq);
151 	xfer_buf = devm_kmalloc(&intf->dev, xfer_size, GFP_KERNEL);
152 	if (!xfer_buf)
153 		return -ENOMEM;
154 
155 	pxrc->urb = usb_alloc_urb(0, GFP_KERNEL);
156 	if (!pxrc->urb)
157 		return -ENOMEM;
158 
159 	error = devm_add_action_or_reset(&intf->dev, pxrc_free_urb, pxrc);
160 	if (error)
161 		return error;
162 
163 	usb_fill_int_urb(pxrc->urb, udev,
164 			 usb_rcvintpipe(udev, epirq->bEndpointAddress),
165 			 xfer_buf, xfer_size, pxrc_usb_irq, pxrc, 1);
166 
167 	pxrc->input = devm_input_allocate_device(&intf->dev);
168 	if (!pxrc->input) {
169 		dev_err(&intf->dev, "couldn't allocate input device\n");
170 		return -ENOMEM;
171 	}
172 
173 	pxrc->input->name = "PXRC Flight Controller Adapter";
174 
175 	usb_make_path(udev, pxrc->phys, sizeof(pxrc->phys));
176 	strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys));
177 	pxrc->input->phys = pxrc->phys;
178 
179 	usb_to_input_id(udev, &pxrc->input->id);
180 
181 	pxrc->input->open = pxrc_open;
182 	pxrc->input->close = pxrc_close;
183 
184 	input_set_capability(pxrc->input, EV_KEY, BTN_A);
185 	input_set_abs_params(pxrc->input, ABS_X, 0, 255, 0, 0);
186 	input_set_abs_params(pxrc->input, ABS_Y, 0, 255, 0, 0);
187 	input_set_abs_params(pxrc->input, ABS_RX, 0, 255, 0, 0);
188 	input_set_abs_params(pxrc->input, ABS_RY, 0, 255, 0, 0);
189 	input_set_abs_params(pxrc->input, ABS_RUDDER, 0, 255, 0, 0);
190 	input_set_abs_params(pxrc->input, ABS_THROTTLE, 0, 255, 0, 0);
191 	input_set_abs_params(pxrc->input, ABS_MISC, 0, 255, 0, 0);
192 
193 	input_set_drvdata(pxrc->input, pxrc);
194 
195 	error = input_register_device(pxrc->input);
196 	if (error)
197 		return error;
198 
199 	return 0;
200 }
201 
pxrc_disconnect(struct usb_interface * intf)202 static void pxrc_disconnect(struct usb_interface *intf)
203 {
204 	/* All driver resources are devm-managed. */
205 }
206 
pxrc_suspend(struct usb_interface * intf,pm_message_t message)207 static int pxrc_suspend(struct usb_interface *intf, pm_message_t message)
208 {
209 	struct pxrc *pxrc = usb_get_intfdata(intf);
210 
211 	mutex_lock(&pxrc->pm_mutex);
212 	if (pxrc->is_open)
213 		usb_kill_urb(pxrc->urb);
214 	mutex_unlock(&pxrc->pm_mutex);
215 
216 	return 0;
217 }
218 
pxrc_resume(struct usb_interface * intf)219 static int pxrc_resume(struct usb_interface *intf)
220 {
221 	struct pxrc *pxrc = usb_get_intfdata(intf);
222 	int retval = 0;
223 
224 	mutex_lock(&pxrc->pm_mutex);
225 	if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
226 		retval = -EIO;
227 
228 	mutex_unlock(&pxrc->pm_mutex);
229 	return retval;
230 }
231 
pxrc_pre_reset(struct usb_interface * intf)232 static int pxrc_pre_reset(struct usb_interface *intf)
233 {
234 	struct pxrc *pxrc = usb_get_intfdata(intf);
235 
236 	mutex_lock(&pxrc->pm_mutex);
237 	usb_kill_urb(pxrc->urb);
238 	return 0;
239 }
240 
pxrc_post_reset(struct usb_interface * intf)241 static int pxrc_post_reset(struct usb_interface *intf)
242 {
243 	struct pxrc *pxrc = usb_get_intfdata(intf);
244 	int retval = 0;
245 
246 	if (pxrc->is_open && usb_submit_urb(pxrc->urb, GFP_KERNEL) < 0)
247 		retval = -EIO;
248 
249 	mutex_unlock(&pxrc->pm_mutex);
250 
251 	return retval;
252 }
253 
pxrc_reset_resume(struct usb_interface * intf)254 static int pxrc_reset_resume(struct usb_interface *intf)
255 {
256 	return pxrc_resume(intf);
257 }
258 
259 static const struct usb_device_id pxrc_table[] = {
260 	{ USB_DEVICE(PXRC_VENDOR_ID, PXRC_PRODUCT_ID) },
261 	{ }
262 };
263 MODULE_DEVICE_TABLE(usb, pxrc_table);
264 
265 static struct usb_driver pxrc_driver = {
266 	.name =		"pxrc",
267 	.probe =	pxrc_probe,
268 	.disconnect =	pxrc_disconnect,
269 	.id_table =	pxrc_table,
270 	.suspend	= pxrc_suspend,
271 	.resume		= pxrc_resume,
272 	.pre_reset	= pxrc_pre_reset,
273 	.post_reset	= pxrc_post_reset,
274 	.reset_resume	= pxrc_reset_resume,
275 };
276 
277 module_usb_driver(pxrc_driver);
278 
279 MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
280 MODULE_DESCRIPTION("PhoenixRC Flight Controller Adapter");
281 MODULE_LICENSE("GPL v2");
282