summaryrefslogtreecommitdiff
path: root/drivers/media/rc/igorplugusb.c
blob: b981f7290c1b20577ea2183c11d40769dee0c6c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * IgorPlug-USB IR Receiver
 *
 * Copyright (C) 2014 Sean Young <sean@mess.org>
 *
 * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.
 * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
 *
 * Based on the lirc_igorplugusb.c driver:
 *	Copyright (C) 2004 Jan M. Hochstein
 *	<hochstein@algo.informatik.tu-darmstadt.de>
 */
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <media/rc-core.h>

#define DRIVER_DESC		"IgorPlug-USB IR Receiver"
#define DRIVER_NAME		"igorplugusb"

#define HEADERLEN		3
#define BUFLEN			36
#define MAX_PACKET		(HEADERLEN + BUFLEN)

#define SET_INFRABUFFER_EMPTY	1
#define GET_INFRACODE		2


struct igorplugusb {
	struct rc_dev *rc;
	struct device *dev;

	struct urb *urb;
	struct usb_ctrlrequest request;

	struct timer_list timer;

	uint8_t buf_in[MAX_PACKET];

	char phys[64];
};

static void igorplugusb_cmd(struct igorplugusb *ir, int cmd);

static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len)
{
	struct ir_raw_event rawir = {};
	unsigned i, start, overflow;

	dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len);

	/*
	 * If more than 36 pulses and spaces follow each other, the igorplugusb
	 * overwrites its buffer from the beginning. The overflow value is the
	 * last offset which was not overwritten. Everything from this offset
	 * onwards occurred before everything until this offset.
	 */
	overflow = ir->buf_in[2];
	i = start = overflow + HEADERLEN;

	if (start >= len) {
		dev_err(ir->dev, "receive overflow invalid: %u", overflow);
	} else {
		if (overflow > 0)
			dev_warn(ir->dev, "receive overflow, at least %u lost",
								overflow);

		do {
			rawir.duration = ir->buf_in[i] * 85333;
			rawir.pulse = i & 1;

			ir_raw_event_store_with_filter(ir->rc, &rawir);

			if (++i == len)
				i = HEADERLEN;
		} while (i != start);

		/* add a trailing space */
		rawir.duration = ir->rc->timeout;
		rawir.pulse = false;
		ir_raw_event_store_with_filter(ir->rc, &rawir);

		ir_raw_event_handle(ir->rc);
	}

	igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
}

static void igorplugusb_callback(struct urb *urb)
{
	struct usb_ctrlrequest *req;
	struct igorplugusb *ir = urb->context;

	req = (struct usb_ctrlrequest *)urb->setup_packet;

	switch (urb->status) {
	case 0:
		if (req->bRequest == GET_INFRACODE &&
					urb->actual_length > HEADERLEN)
			igorplugusb_irdata(ir, urb->actual_length);
		else /* request IR */
			mod_timer(&ir->timer, jiffies + msecs_to_jiffies(50));
		break;
	case -EPROTO:
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		usb_unlink_urb(urb);
		return;
	default:
		dev_warn(ir->dev, "Error: urb status = %d\n", urb->status);
		igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);
		break;
	}
}

static void igorplugusb_cmd(struct igorplugusb *ir, int cmd)
{
	int ret;

	ir->request.bRequest = cmd;
	ir->urb->transfer_flags = 0;
	ret = usb_submit_urb(ir->urb, GFP_ATOMIC);
	if (ret)
		dev_err(ir->dev, "submit urb failed: %d", ret);
}

static void igorplugusb_timer(struct timer_list *t)
{
	struct igorplugusb *ir = from_timer(ir, t, timer);

	igorplugusb_cmd(ir, GET_INFRACODE);
}

static int igorplugusb_probe(struct usb_interface *intf,
					const struct usb_device_id *id)
{
	struct usb_device *udev;
	struct usb_host_interface *idesc;
	struct usb_endpoint_descriptor *ep;
	struct igorplugusb *ir;
	struct rc_dev *rc;
	int ret = -ENOMEM;

	udev = interface_to_usbdev(intf);
	idesc = intf->cur_altsetting;

	if (idesc->desc.bNumEndpoints != 1) {
		dev_err(&intf->dev, "incorrect number of endpoints");
		return -ENODEV;
	}

	ep = &idesc->endpoint[0].desc;
	if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) {
		dev_err(&intf->dev, "endpoint incorrect");
		return -ENODEV;
	}

	ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL);
	if (!ir)
		return -ENOMEM;

	ir->dev = &intf->dev;

	timer_setup(&ir->timer, igorplugusb_timer, 0);

	ir->request.bRequest = GET_INFRACODE;
	ir->request.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;
	ir->request.wLength = cpu_to_le16(sizeof(ir->buf_in));

	ir->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!ir->urb)
		goto fail;

	usb_fill_control_urb(ir->urb, udev,
		usb_rcvctrlpipe(udev, 0), (uint8_t *)&ir->request,
		ir->buf_in, sizeof(ir->buf_in), igorplugusb_callback, ir);

	usb_make_path(udev, ir->phys, sizeof(ir->phys));

	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
	if (!rc)
		goto fail;

	rc->device_name = DRIVER_DESC;
	rc->input_phys = ir->phys;
	usb_to_input_id(udev, &rc->input_id);
	rc->dev.parent = &intf->dev;
	/*
	 * This device can only store 36 pulses + spaces, which is not enough
	 * for the NEC protocol and many others.
	 */
	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER &
		~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 |
		  RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 |
		  RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE |
		  RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_SANYO);

	rc->priv = ir;
	rc->driver_name = DRIVER_NAME;
	rc->map_name = RC_MAP_HAUPPAUGE;
	rc->timeout = MS_TO_NS(100);
	rc->rx_resolution = 85333;

	ir->rc = rc;
	ret = rc_register_device(rc);
	if (ret) {
		dev_err(&intf->dev, "failed to register rc device: %d", ret);
		goto fail;
	}

	usb_set_intfdata(intf, ir);

	igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);

	return 0;
fail:
	rc_free_device(ir->rc);
	usb_free_urb(ir->urb);
	del_timer(&ir->timer);

	return ret;
}

static void igorplugusb_disconnect(struct usb_interface *intf)
{
	struct igorplugusb *ir = usb_get_intfdata(intf);

	rc_unregister_device(ir->rc);
	del_timer_sync(&ir->timer);
	usb_set_intfdata(intf, NULL);
	usb_kill_urb(ir->urb);
	usb_free_urb(ir->urb);
}

static const struct usb_device_id igorplugusb_table[] = {
	/* Igor Plug USB (Atmel's Manufact. ID) */
	{ USB_DEVICE(0x03eb, 0x0002) },
	/* Fit PC2 Infrared Adapter */
	{ USB_DEVICE(0x03eb, 0x21fe) },
	/* Terminating entry */
	{ }
};

static struct usb_driver igorplugusb_driver = {
	.name =	DRIVER_NAME,
	.probe = igorplugusb_probe,
	.disconnect = igorplugusb_disconnect,
	.id_table = igorplugusb_table
};

module_usb_driver(igorplugusb_driver);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, igorplugusb_table);