1// SPDX-License-Identifier: GPL-2.0+
2// Driver for Xbox DVD Movie Playback Kit
3// Copyright (c) 2018 by Benjamin Valentin <benpicco@googlemail.com>
4
5/*
6 *  Xbox DVD Movie Playback Kit USB IR dongle support
7 *
8 *  The driver was derived from the ati_remote driver 2.2.1
9 *          and used information from lirc_xbox.c
10 *
11 *          Copyright (c) 2011, 2012 Anssi Hannula <anssi.hannula@iki.fi>
12 *          Copyright (c) 2004 Torrey Hoffman <thoffman@arnor.net>
13 *          Copyright (c) 2002 Vladimir Dergachev
14 *          Copyright (c) 2003-2004 Paul Miller <pmiller9@users.sourceforge.net>
15 */
16
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/usb/input.h>
20#include <media/rc-core.h>
21
22/*
23 * Module and Version Information
24 */
25#define DRIVER_VERSION	"1.0.0"
26#define DRIVER_AUTHOR	"Benjamin Valentin <benpicco@googlemail.com>"
27#define DRIVER_DESC		"Xbox DVD USB Remote Control"
28
29#define NAME_BUFSIZE      80    /* size of product name, path buffers */
30#define DATA_BUFSIZE      8     /* size of URB data buffers */
31
32/*
33 * USB vendor ids for XBOX DVD Dongles
34 */
35#define VENDOR_GAMESTER     0x040b
36#define VENDOR_MICROSOFT    0x045e
37
38static const struct usb_device_id xbox_remote_table[] = {
39	/* Gamester Xbox DVD Movie Playback Kit IR */
40	{
41		USB_DEVICE(VENDOR_GAMESTER, 0x6521),
42	},
43	/* Microsoft Xbox DVD Movie Playback Kit IR */
44	{
45		USB_DEVICE(VENDOR_MICROSOFT, 0x0284),
46	},
47	{}	/* Terminating entry */
48};
49
50MODULE_DEVICE_TABLE(usb, xbox_remote_table);
51
52struct xbox_remote {
53	struct rc_dev *rdev;
54	struct usb_device *udev;
55	struct usb_interface *interface;
56
57	struct urb *irq_urb;
58	unsigned char inbuf[DATA_BUFSIZE] __aligned(sizeof(u16));
59
60	char rc_name[NAME_BUFSIZE];
61	char rc_phys[NAME_BUFSIZE];
62};
63
64static int xbox_remote_rc_open(struct rc_dev *rdev)
65{
66	struct xbox_remote *xbox_remote = rdev->priv;
67
68	/* On first open, submit the read urb which was set up previously. */
69	xbox_remote->irq_urb->dev = xbox_remote->udev;
70	if (usb_submit_urb(xbox_remote->irq_urb, GFP_KERNEL)) {
71		dev_err(&xbox_remote->interface->dev,
72			"%s: usb_submit_urb failed!\n", __func__);
73		return -EIO;
74	}
75
76	return 0;
77}
78
79static void xbox_remote_rc_close(struct rc_dev *rdev)
80{
81	struct xbox_remote *xbox_remote = rdev->priv;
82
83	usb_kill_urb(xbox_remote->irq_urb);
84}
85
86/*
87 * xbox_remote_report_input
88 */
89static void xbox_remote_input_report(struct urb *urb)
90{
91	struct xbox_remote *xbox_remote = urb->context;
92	unsigned char *data = xbox_remote->inbuf;
93
94	/*
95	 * data[0] = 0x00
96	 * data[1] = length - always 0x06
97	 * data[2] = the key code
98	 * data[3] = high part of key code
99	 * data[4] = last_press_ms (low)
100	 * data[5] = last_press_ms (high)
101	 */
102
103	/* Deal with strange looking inputs */
104	if (urb->actual_length != 6 || urb->actual_length != data[1]) {
105		dev_warn(&urb->dev->dev, "Weird data, len=%d: %*ph\n",
106			 urb->actual_length, urb->actual_length, data);
107		return;
108	}
109
110	rc_keydown(xbox_remote->rdev, RC_PROTO_XBOX_DVD,
111		   le16_to_cpup((__le16 *)(data + 2)), 0);
112}
113
114/*
115 * xbox_remote_irq_in
116 */
117static void xbox_remote_irq_in(struct urb *urb)
118{
119	struct xbox_remote *xbox_remote = urb->context;
120	int retval;
121
122	switch (urb->status) {
123	case 0:			/* success */
124		xbox_remote_input_report(urb);
125		break;
126	case -ECONNRESET:	/* unlink */
127	case -ENOENT:
128	case -ESHUTDOWN:
129		dev_dbg(&xbox_remote->interface->dev,
130			"%s: urb error status, unlink?\n",
131			__func__);
132		return;
133	default:		/* error */
134		dev_dbg(&xbox_remote->interface->dev,
135			"%s: Nonzero urb status %d\n",
136			__func__, urb->status);
137	}
138
139	retval = usb_submit_urb(urb, GFP_ATOMIC);
140	if (retval)
141		dev_err(&xbox_remote->interface->dev,
142			"%s: usb_submit_urb()=%d\n",
143			__func__, retval);
144}
145
146static void xbox_remote_rc_init(struct xbox_remote *xbox_remote)
147{
148	struct rc_dev *rdev = xbox_remote->rdev;
149
150	rdev->priv = xbox_remote;
151	rdev->allowed_protocols = RC_PROTO_BIT_XBOX_DVD;
152	rdev->driver_name = "xbox_remote";
153
154	rdev->open = xbox_remote_rc_open;
155	rdev->close = xbox_remote_rc_close;
156
157	rdev->device_name = xbox_remote->rc_name;
158	rdev->input_phys = xbox_remote->rc_phys;
159
160	rdev->timeout = MS_TO_US(10);
161
162	usb_to_input_id(xbox_remote->udev, &rdev->input_id);
163	rdev->dev.parent = &xbox_remote->interface->dev;
164}
165
166static void xbox_remote_initialize(struct xbox_remote *xbox_remote,
167				   struct usb_endpoint_descriptor *endpoint_in)
168{
169	struct usb_device *udev = xbox_remote->udev;
170	int pipe, maxp;
171
172	/* Set up irq_urb */
173	pipe = usb_rcvintpipe(udev, endpoint_in->bEndpointAddress);
174	maxp = usb_maxpacket(udev, pipe);
175	maxp = (maxp > DATA_BUFSIZE) ? DATA_BUFSIZE : maxp;
176
177	usb_fill_int_urb(xbox_remote->irq_urb, udev, pipe, xbox_remote->inbuf,
178			 maxp, xbox_remote_irq_in, xbox_remote,
179			 endpoint_in->bInterval);
180}
181
182/*
183 * xbox_remote_probe
184 */
185static int xbox_remote_probe(struct usb_interface *interface,
186			     const struct usb_device_id *id)
187{
188	struct usb_device *udev = interface_to_usbdev(interface);
189	struct usb_host_interface *iface_host = interface->cur_altsetting;
190	struct usb_endpoint_descriptor *endpoint_in;
191	struct xbox_remote *xbox_remote;
192	struct rc_dev *rc_dev;
193	int err = -ENOMEM;
194
195	// why is there also a device with no endpoints?
196	if (iface_host->desc.bNumEndpoints == 0)
197		return -ENODEV;
198
199	if (iface_host->desc.bNumEndpoints != 1) {
200		pr_err("%s: Unexpected desc.bNumEndpoints: %d\n",
201		       __func__, iface_host->desc.bNumEndpoints);
202		return -ENODEV;
203	}
204
205	endpoint_in = &iface_host->endpoint[0].desc;
206
207	if (!usb_endpoint_is_int_in(endpoint_in)) {
208		pr_err("%s: Unexpected endpoint_in\n", __func__);
209		return -ENODEV;
210	}
211	if (le16_to_cpu(endpoint_in->wMaxPacketSize) == 0) {
212		pr_err("%s: endpoint_in message size==0?\n", __func__);
213		return -ENODEV;
214	}
215
216	xbox_remote = kzalloc(sizeof(*xbox_remote), GFP_KERNEL);
217	rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
218	if (!xbox_remote || !rc_dev)
219		goto exit_free_dev_rdev;
220
221	/* Allocate URB buffer */
222	xbox_remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
223	if (!xbox_remote->irq_urb)
224		goto exit_free_buffers;
225
226	xbox_remote->udev = udev;
227	xbox_remote->rdev = rc_dev;
228	xbox_remote->interface = interface;
229
230	usb_make_path(udev, xbox_remote->rc_phys, sizeof(xbox_remote->rc_phys));
231
232	strlcat(xbox_remote->rc_phys, "/input0", sizeof(xbox_remote->rc_phys));
233
234	snprintf(xbox_remote->rc_name, sizeof(xbox_remote->rc_name), "%s%s%s",
235		 udev->manufacturer ?: "",
236		 udev->manufacturer && udev->product ? " " : "",
237		 udev->product ?: "");
238
239	if (!strlen(xbox_remote->rc_name))
240		snprintf(xbox_remote->rc_name, sizeof(xbox_remote->rc_name),
241			 DRIVER_DESC "(%04x,%04x)",
242			 le16_to_cpu(xbox_remote->udev->descriptor.idVendor),
243			 le16_to_cpu(xbox_remote->udev->descriptor.idProduct));
244
245	rc_dev->map_name = RC_MAP_XBOX_DVD; /* default map */
246
247	xbox_remote_rc_init(xbox_remote);
248
249	/* Device Hardware Initialization */
250	xbox_remote_initialize(xbox_remote, endpoint_in);
251
252	/* Set up and register rc device */
253	err = rc_register_device(xbox_remote->rdev);
254	if (err)
255		goto exit_kill_urbs;
256
257	usb_set_intfdata(interface, xbox_remote);
258
259	return 0;
260
261exit_kill_urbs:
262	usb_kill_urb(xbox_remote->irq_urb);
263exit_free_buffers:
264	usb_free_urb(xbox_remote->irq_urb);
265exit_free_dev_rdev:
266	rc_free_device(rc_dev);
267	kfree(xbox_remote);
268
269	return err;
270}
271
272/*
273 * xbox_remote_disconnect
274 */
275static void xbox_remote_disconnect(struct usb_interface *interface)
276{
277	struct xbox_remote *xbox_remote;
278
279	xbox_remote = usb_get_intfdata(interface);
280	usb_set_intfdata(interface, NULL);
281	if (!xbox_remote) {
282		dev_warn(&interface->dev, "%s - null device?\n", __func__);
283		return;
284	}
285
286	usb_kill_urb(xbox_remote->irq_urb);
287	rc_unregister_device(xbox_remote->rdev);
288	usb_free_urb(xbox_remote->irq_urb);
289	kfree(xbox_remote);
290}
291
292/* usb specific object to register with the usb subsystem */
293static struct usb_driver xbox_remote_driver = {
294	.name         = "xbox_remote",
295	.probe        = xbox_remote_probe,
296	.disconnect   = xbox_remote_disconnect,
297	.id_table     = xbox_remote_table,
298};
299
300module_usb_driver(xbox_remote_driver);
301
302MODULE_AUTHOR(DRIVER_AUTHOR);
303MODULE_DESCRIPTION(DRIVER_DESC);
304MODULE_LICENSE("GPL");
305