summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/dvb-usb-v2/usb_urb.c
blob: ca8f3c2b10824c29c28f4be0e54ae931f08a8059 (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
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
/* usb-urb.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
 * see dvb-usb-init.c for copyright information.
 *
 * This file keeps functions for initializing and handling the
 * BULK and ISOC USB data transfers in a generic way.
 * Can be used for DVB-only and also, that's the plan, for
 * Hybrid USB devices (analog and DVB).
 */
#include "dvb_usb_common.h"

/* URB stuff for streaming */

int usb_urb_reconfig(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props);

static void usb_urb_complete(struct urb *urb)
{
	struct usb_data_stream *stream = urb->context;
	int ptype = usb_pipetype(urb->pipe);
	int i;
	u8 *b;

	dev_dbg_ratelimited(&stream->udev->dev,
			"%s: %s urb completed status=%d length=%d/%d pack_num=%d errors=%d\n",
			__func__, ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
			urb->status, urb->actual_length,
			urb->transfer_buffer_length,
			urb->number_of_packets, urb->error_count);

	switch (urb->status) {
	case 0:         /* success */
	case -ETIMEDOUT:    /* NAK */
		break;
	case -ECONNRESET:   /* kill */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:        /* error */
		dev_dbg_ratelimited(&stream->udev->dev,
				"%s: urb completition failed=%d\n",
				__func__, urb->status);
		break;
	}

	b = (u8 *) urb->transfer_buffer;
	switch (ptype) {
	case PIPE_ISOCHRONOUS:
		for (i = 0; i < urb->number_of_packets; i++) {
			if (urb->iso_frame_desc[i].status != 0)
				dev_dbg(&stream->udev->dev,
						"%s: iso frame descriptor has an error=%d\n",
						__func__,
						urb->iso_frame_desc[i].status);
			else if (urb->iso_frame_desc[i].actual_length > 0)
				stream->complete(stream,
					b + urb->iso_frame_desc[i].offset,
					urb->iso_frame_desc[i].actual_length);

			urb->iso_frame_desc[i].status = 0;
			urb->iso_frame_desc[i].actual_length = 0;
		}
		break;
	case PIPE_BULK:
		if (urb->actual_length > 0)
			stream->complete(stream, b, urb->actual_length);
		break;
	default:
		dev_err(&stream->udev->dev,
				"%s: unknown endpoint type in completition handler\n",
				KBUILD_MODNAME);
		return;
	}
	usb_submit_urb(urb, GFP_ATOMIC);
}

int usb_urb_killv2(struct usb_data_stream *stream)
{
	int i;
	for (i = 0; i < stream->urbs_submitted; i++) {
		dev_dbg(&stream->udev->dev, "%s: kill urb=%d\n", __func__, i);
		/* stop the URB */
		usb_kill_urb(stream->urb_list[i]);
	}
	stream->urbs_submitted = 0;
	return 0;
}

int usb_urb_submitv2(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props)
{
	int i, ret;

	if (props) {
		ret = usb_urb_reconfig(stream, props);
		if (ret < 0)
			return ret;
	}

	for (i = 0; i < stream->urbs_initialized; i++) {
		dev_dbg(&stream->udev->dev, "%s: submit urb=%d\n", __func__, i);
		ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);
		if (ret) {
			dev_err(&stream->udev->dev,
					"%s: could not submit urb no. %d - get them all back\n",
					KBUILD_MODNAME, i);
			usb_urb_killv2(stream);
			return ret;
		}
		stream->urbs_submitted++;
	}
	return 0;
}

static int usb_urb_free_urbs(struct usb_data_stream *stream)
{
	int i;

	usb_urb_killv2(stream);

	for (i = stream->urbs_initialized - 1; i >= 0; i--) {
		if (stream->urb_list[i]) {
			dev_dbg(&stream->udev->dev, "%s: free urb=%d\n",
					__func__, i);
			/* free the URBs */
			usb_free_urb(stream->urb_list[i]);
		}
	}
	stream->urbs_initialized = 0;

	return 0;
}

static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
{
	int i, j;

	/* allocate the URBs */
	for (i = 0; i < stream->props.count; i++) {
		dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
		stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
		if (!stream->urb_list[i]) {
			dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
			for (j = 0; j < i; j++)
				usb_free_urb(stream->urb_list[j]);
			return -ENOMEM;
		}
		usb_fill_bulk_urb(stream->urb_list[i],
				stream->udev,
				usb_rcvbulkpipe(stream->udev,
						stream->props.endpoint),
				stream->buf_list[i],
				stream->props.u.bulk.buffersize,
				usb_urb_complete, stream);

		stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
		stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
		stream->urbs_initialized++;
	}
	return 0;
}

static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
{
	int i, j;

	/* allocate the URBs */
	for (i = 0; i < stream->props.count; i++) {
		struct urb *urb;
		int frame_offset = 0;
		dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);
		stream->urb_list[i] = usb_alloc_urb(
				stream->props.u.isoc.framesperurb, GFP_ATOMIC);
		if (!stream->urb_list[i]) {
			dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);
			for (j = 0; j < i; j++)
				usb_free_urb(stream->urb_list[j]);
			return -ENOMEM;
		}

		urb = stream->urb_list[i];

		urb->dev = stream->udev;
		urb->context = stream;
		urb->complete = usb_urb_complete;
		urb->pipe = usb_rcvisocpipe(stream->udev,
				stream->props.endpoint);
		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
		urb->interval = stream->props.u.isoc.interval;
		urb->number_of_packets = stream->props.u.isoc.framesperurb;
		urb->transfer_buffer_length = stream->props.u.isoc.framesize *
				stream->props.u.isoc.framesperurb;
		urb->transfer_buffer = stream->buf_list[i];
		urb->transfer_dma = stream->dma_addr[i];

		for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
			urb->iso_frame_desc[j].offset = frame_offset;
			urb->iso_frame_desc[j].length =
					stream->props.u.isoc.framesize;
			frame_offset += stream->props.u.isoc.framesize;
		}

		stream->urbs_initialized++;
	}
	return 0;
}

static int usb_free_stream_buffers(struct usb_data_stream *stream)
{
	if (stream->state & USB_STATE_URB_BUF) {
		while (stream->buf_num) {
			stream->buf_num--;
			dev_dbg(&stream->udev->dev, "%s: free buf=%d\n",
				__func__, stream->buf_num);
			usb_free_coherent(stream->udev, stream->buf_size,
					  stream->buf_list[stream->buf_num],
					  stream->dma_addr[stream->buf_num]);
		}
	}

	stream->state &= ~USB_STATE_URB_BUF;

	return 0;
}

static int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
				    unsigned long size)
{
	stream->buf_num = 0;
	stream->buf_size = size;

	dev_dbg(&stream->udev->dev,
			"%s: all in all I will use %lu bytes for streaming\n",
			__func__,  num * size);

	for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
		stream->buf_list[stream->buf_num] = usb_alloc_coherent(
				stream->udev, size, GFP_ATOMIC,
				&stream->dma_addr[stream->buf_num]);
		if (!stream->buf_list[stream->buf_num]) {
			dev_dbg(&stream->udev->dev, "%s: alloc buf=%d failed\n",
					__func__, stream->buf_num);
			usb_free_stream_buffers(stream);
			return -ENOMEM;
		}

		dev_dbg(&stream->udev->dev, "%s: alloc buf=%d %p (dma %llu)\n",
				__func__, stream->buf_num,
				stream->buf_list[stream->buf_num],
				(long long)stream->dma_addr[stream->buf_num]);
		memset(stream->buf_list[stream->buf_num], 0, size);
		stream->state |= USB_STATE_URB_BUF;
	}

	return 0;
}

int usb_urb_reconfig(struct usb_data_stream *stream,
		struct usb_data_stream_properties *props)
{
	int buf_size;

	if (!props)
		return 0;

	/* check allocated buffers are large enough for the request */
	if (props->type == USB_BULK) {
		buf_size = stream->props.u.bulk.buffersize;
	} else if (props->type == USB_ISOC) {
		buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;
	} else {
		dev_err(&stream->udev->dev, "%s: invalid endpoint type=%d\n",
				KBUILD_MODNAME, props->type);
		return -EINVAL;
	}

	if (stream->buf_num < props->count || stream->buf_size < buf_size) {
		dev_err(&stream->udev->dev,
				"%s: cannot reconfigure as allocated buffers are too small\n",
				KBUILD_MODNAME);
		return -EINVAL;
	}

	/* check if all fields are same */
	if (stream->props.type == props->type &&
			stream->props.count == props->count &&
			stream->props.endpoint == props->endpoint) {
		if (props->type == USB_BULK &&
				props->u.bulk.buffersize ==
				stream->props.u.bulk.buffersize)
			return 0;
		else if (props->type == USB_ISOC &&
				props->u.isoc.framesperurb ==
				stream->props.u.isoc.framesperurb &&
				props->u.isoc.framesize ==
				stream->props.u.isoc.framesize &&
				props->u.isoc.interval ==
				stream->props.u.isoc.interval)
			return 0;
	}

	dev_dbg(&stream->udev->dev, "%s: re-alloc urbs\n", __func__);

	usb_urb_free_urbs(stream);
	memcpy(&stream->props, props, sizeof(*props));
	if (props->type == USB_BULK)
		return usb_urb_alloc_bulk_urbs(stream);
	else if (props->type == USB_ISOC)
		return usb_urb_alloc_isoc_urbs(stream);

	return 0;
}

int usb_urb_initv2(struct usb_data_stream *stream,
		const struct usb_data_stream_properties *props)
{
	int ret;

	if (!stream || !props)
		return -EINVAL;

	memcpy(&stream->props, props, sizeof(*props));

	if (!stream->complete) {
		dev_err(&stream->udev->dev,
				"%s: there is no data callback - this doesn't make sense\n",
				KBUILD_MODNAME);
		return -EINVAL;
	}

	switch (stream->props.type) {
	case USB_BULK:
		ret = usb_alloc_stream_buffers(stream, stream->props.count,
				stream->props.u.bulk.buffersize);
		if (ret < 0)
			return ret;

		return usb_urb_alloc_bulk_urbs(stream);
	case USB_ISOC:
		ret = usb_alloc_stream_buffers(stream, stream->props.count,
				stream->props.u.isoc.framesize *
				stream->props.u.isoc.framesperurb);
		if (ret < 0)
			return ret;

		return usb_urb_alloc_isoc_urbs(stream);
	default:
		dev_err(&stream->udev->dev,
				"%s: unknown urb-type for data transfer\n",
				KBUILD_MODNAME);
		return -EINVAL;
	}
}

int usb_urb_exitv2(struct usb_data_stream *stream)
{
	usb_urb_free_urbs(stream);
	usb_free_stream_buffers(stream);

	return 0;
}
OpenPOWER on IntegriCloud