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
|
/* 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 */
static void usb_urb_complete(struct urb *urb, struct pt_regs *ptregs)
{
struct usb_data_stream *stream = urb->context;
int ptype = usb_pipetype(urb->pipe);
int i;
u8 *b;
deb_uxfer("'%s' urb completed. status: %d, length: %d/%d, pack_num: %d, errors: %d\n",
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 */
deb_ts("urb completition error %d.\n", 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)
deb_ts("iso frame descriptor has an error: %d\n",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;
}
debug_dump(b,20,deb_uxfer);
break;
case PIPE_BULK:
if (urb->actual_length > 0)
stream->complete(stream, b, urb->actual_length);
break;
default:
err("unkown endpoint type in completition handler.");
return;
}
usb_submit_urb(urb,GFP_ATOMIC);
}
int usb_urb_kill(struct usb_data_stream *stream)
{
int i;
for (i = 0; i < stream->urbs_submitted; i++) {
deb_ts("killing URB no. %d.\n",i);
/* stop the URB */
usb_kill_urb(stream->urb_list[i]);
}
stream->urbs_submitted = 0;
return 0;
}
int usb_urb_submit(struct usb_data_stream *stream)
{
int i,ret;
for (i = 0; i < stream->urbs_initialized; i++) {
deb_ts("submitting URB no. %d\n",i);
if ((ret = usb_submit_urb(stream->urb_list[i],GFP_ATOMIC))) {
err("could not submit URB no. %d - get them all back",i);
usb_urb_kill(stream);
return ret;
}
stream->urbs_submitted++;
}
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--;
deb_mem("freeing buffer %d\n",stream->buf_num);
usb_buffer_free(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_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size)
{
stream->buf_num = 0;
stream->buf_size = size;
deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
deb_mem("allocating buffer %d\n",stream->buf_num);
if (( stream->buf_list[stream->buf_num] =
usb_buffer_alloc(stream->udev, size, SLAB_ATOMIC,
&stream->dma_addr[stream->buf_num]) ) == NULL) {
deb_mem("not enough memory for urb-buffer allocation.\n");
usb_free_stream_buffers(stream);
return -ENOMEM;
}
deb_mem("buffer %d: %p (dma: %u)\n",
stream->buf_num, stream->buf_list[stream->buf_num], stream->dma_addr[stream->buf_num]);
memset(stream->buf_list[stream->buf_num],0,size);
stream->state |= USB_STATE_URB_BUF;
}
deb_mem("allocation successful\n");
return 0;
}
static int usb_bulk_urb_init(struct usb_data_stream *stream)
{
int i;
if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
stream->props.u.bulk.buffersize)) < 0)
return i;
/* allocate the URBs */
for (i = 0; i < stream->props.count; i++) {
if ((stream->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
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 = 0;
stream->urbs_initialized++;
}
return 0;
}
static int usb_isoc_urb_init(struct usb_data_stream *stream)
{
int i,j;
if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)
return i;
/* allocate the URBs */
for (i = 0; i < stream->props.count; i++) {
struct urb *urb;
int frame_offset = 0;
if ((stream->urb_list[i] =
usb_alloc_urb(stream->props.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
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->buf_size;
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;
}
int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)
{
if (stream == NULL || props == NULL)
return -EINVAL;
memcpy(&stream->props, props, sizeof(*props));
usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint));
if (stream->complete == NULL) {
err("there is no data callback - this doesn't make sense.");
return -EINVAL;
}
switch (stream->props.type) {
case USB_BULK:
return usb_bulk_urb_init(stream);
case USB_ISOC:
return usb_isoc_urb_init(stream);
default:
err("unkown URB-type for data transfer.");
return -EINVAL;
}
}
int usb_urb_exit(struct usb_data_stream *stream)
{
int i;
usb_urb_kill(stream);
for (i = 0; i < stream->urbs_initialized; i++) {
if (stream->urb_list[i] != NULL) {
deb_mem("freeing URB no. %d.\n",i);
/* free the URBs */
usb_free_urb(stream->urb_list[i]);
}
}
stream->urbs_initialized = 0;
usb_free_stream_buffers(stream);
return 0;
}
|
