1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IgorPlug-USB IR Receiver
4 *
5 * Copyright (C) 2014 Sean Young <sean@mess.org>
6 *
7 * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.
8 * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
9 *
10 * Based on the lirc_igorplugusb.c driver:
11 *	Copyright (C) 2004 Jan M. Hochstein
12 *	<hochstein@algo.informatik.tu-darmstadt.de>
13 */
14#include <linux/device.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/usb.h>
18#include <linux/usb/input.h>
19#include <media/rc-core.h>
20
21#define DRIVER_DESC		"IgorPlug-USB IR Receiver"
22#define DRIVER_NAME		"igorplugusb"
23
24#define HEADERLEN		3
25#define BUFLEN			36
26#define MAX_PACKET		(HEADERLEN + BUFLEN)
27
28#define SET_INFRABUFFER_EMPTY	1
29#define GET_INFRACODE		2
30
31
32struct igorplugusb {
33	struct rc_dev *rc;
34	struct device *dev;
35
36	struct urb *urb;
37	struct usb_ctrlrequest request;
38
39	struct timer_list timer;
40
41	uint8_t buf_in[MAX_PACKET];
42
43	char phys[64];
44};
45
46static void igorplugusb_cmd(struct igorplugusb *ir, int cmd);
47
48static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len)
49{
50	struct ir_raw_event rawir = {};
51	unsigned i, start, overflow;
52
53	dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len);
54
55	/*
56	 * If more than 36 pulses and spaces follow each other, the igorplugusb
57	 * overwrites its buffer from the beginning. The overflow value is the
58	 * last offset which was not overwritten. Everything from this offset
59	 * onwards occurred before everything until this offset.
60	 */
61	overflow = ir->buf_in[2];
62	i = start = overflow + HEADERLEN;
63
64	if (start >= len) {
65		dev_err(ir->dev, "receive overflow invalid: %u", overflow);
66	} else {
67		if (overflow > 0) {
68			dev_warn(ir->dev, "receive overflow, at least %u lost",
69								overflow);
70			ir_raw_event_reset(ir->rc);
71		}
72
73		do {
74			rawir.duration = ir->buf_in[i] * 85;
75			rawir.pulse = i & 1;
76
77			ir_raw_event_store_with_filter(ir->rc, &rawir);
78
79			if (++i == len)
80				i = HEADERLEN;
81		} while (i != start);
82
83		/* add a trailing space */
84		rawir.duration = ir->rc->timeout;
85		rawir.pulse = false;
86		ir_raw_event_store_with_filter(ir->rc, &rawir);
87
88		ir_raw_event_handle(ir->rc);
89	}
90
91	igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
92}
93
94static void igorplugusb_callback(struct urb *urb)
95{
96	struct usb_ctrlrequest *req;
97	struct igorplugusb *ir = urb->context;
98
99	req = (struct usb_ctrlrequest *)urb->setup_packet;
100
101	switch (urb->status) {
102	case 0:
103		if (req->bRequest == GET_INFRACODE &&
104					urb->actual_length > HEADERLEN)
105			igorplugusb_irdata(ir, urb->actual_length);
106		else /* request IR */
107			mod_timer(&ir->timer, jiffies + msecs_to_jiffies(50));
108		break;
109	case -EPROTO:
110	case -ECONNRESET:
111	case -ENOENT:
112	case -ESHUTDOWN:
113		usb_unlink_urb(urb);
114		return;
115	default:
116		dev_warn(ir->dev, "Error: urb status = %d\n", urb->status);
117		igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
118		break;
119	}
120}
121
122static void igorplugusb_cmd(struct igorplugusb *ir, int cmd)
123{
124	int ret;
125
126	ir->request.bRequest = cmd;
127	ir->urb->transfer_flags = 0;
128	ret = usb_submit_urb(ir->urb, GFP_ATOMIC);
129	if (ret)
130		dev_err(ir->dev, "submit urb failed: %d", ret);
131}
132
133static void igorplugusb_timer(struct timer_list *t)
134{
135	struct igorplugusb *ir = from_timer(ir, t, timer);
136
137	igorplugusb_cmd(ir, GET_INFRACODE);
138}
139
140static int igorplugusb_probe(struct usb_interface *intf,
141					const struct usb_device_id *id)
142{
143	struct usb_device *udev;
144	struct usb_host_interface *idesc;
145	struct usb_endpoint_descriptor *ep;
146	struct igorplugusb *ir;
147	struct rc_dev *rc;
148	int ret = -ENOMEM;
149
150	udev = interface_to_usbdev(intf);
151	idesc = intf->cur_altsetting;
152
153	if (idesc->desc.bNumEndpoints != 1) {
154		dev_err(&intf->dev, "incorrect number of endpoints");
155		return -ENODEV;
156	}
157
158	ep = &idesc->endpoint[0].desc;
159	if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) {
160		dev_err(&intf->dev, "endpoint incorrect");
161		return -ENODEV;
162	}
163
164	ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL);
165	if (!ir)
166		return -ENOMEM;
167
168	ir->dev = &intf->dev;
169
170	timer_setup(&ir->timer, igorplugusb_timer, 0);
171
172	ir->request.bRequest = GET_INFRACODE;
173	ir->request.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;
174	ir->request.wLength = cpu_to_le16(sizeof(ir->buf_in));
175
176	ir->urb = usb_alloc_urb(0, GFP_KERNEL);
177	if (!ir->urb)
178		goto fail;
179
180	usb_fill_control_urb(ir->urb, udev,
181		usb_rcvctrlpipe(udev, 0), (uint8_t *)&ir->request,
182		ir->buf_in, sizeof(ir->buf_in), igorplugusb_callback, ir);
183
184	usb_make_path(udev, ir->phys, sizeof(ir->phys));
185
186	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
187	if (!rc)
188		goto fail;
189
190	rc->device_name = DRIVER_DESC;
191	rc->input_phys = ir->phys;
192	usb_to_input_id(udev, &rc->input_id);
193	rc->dev.parent = &intf->dev;
194	/*
195	 * This device can only store 36 pulses + spaces, which is not enough
196	 * for the NEC protocol and many others.
197	 */
198	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER &
199		~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 |
200		  RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 |
201		  RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE |
202		  RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_SANYO);
203
204	rc->priv = ir;
205	rc->driver_name = DRIVER_NAME;
206	rc->map_name = RC_MAP_HAUPPAUGE;
207	rc->timeout = MS_TO_US(100);
208	rc->rx_resolution = 85;
209
210	ir->rc = rc;
211	ret = rc_register_device(rc);
212	if (ret) {
213		dev_err(&intf->dev, "failed to register rc device: %d", ret);
214		goto fail;
215	}
216
217	usb_set_intfdata(intf, ir);
218
219	igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
220
221	return 0;
222fail:
223	rc_free_device(ir->rc);
224	usb_free_urb(ir->urb);
225	del_timer(&ir->timer);
226
227	return ret;
228}
229
230static void igorplugusb_disconnect(struct usb_interface *intf)
231{
232	struct igorplugusb *ir = usb_get_intfdata(intf);
233
234	rc_unregister_device(ir->rc);
235	del_timer_sync(&ir->timer);
236	usb_set_intfdata(intf, NULL);
237	usb_kill_urb(ir->urb);
238	usb_free_urb(ir->urb);
239}
240
241static const struct usb_device_id igorplugusb_table[] = {
242	/* Igor Plug USB (Atmel's Manufact. ID) */
243	{ USB_DEVICE(0x03eb, 0x0002) },
244	/* Fit PC2 Infrared Adapter */
245	{ USB_DEVICE(0x03eb, 0x21fe) },
246	/* Terminating entry */
247	{ }
248};
249
250static struct usb_driver igorplugusb_driver = {
251	.name =	DRIVER_NAME,
252	.probe = igorplugusb_probe,
253	.disconnect = igorplugusb_disconnect,
254	.id_table = igorplugusb_table
255};
256
257module_usb_driver(igorplugusb_driver);
258
259MODULE_DESCRIPTION(DRIVER_DESC);
260MODULE_AUTHOR("Sean Young <sean@mess.org>");
261MODULE_LICENSE("GPL");
262MODULE_DEVICE_TABLE(usb, igorplugusb_table);
263