1 /* usb-urb.c is part of the DVB USB library.
2 *
3 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.de)
4 * see dvb-usb-init.c for copyright information.
5 *
6 * This file keeps functions for initializing and handling the
7 * BULK and ISOC USB data transfers in a generic way.
8 * Can be used for DVB-only and also, that's the plan, for
9 * Hybrid USB devices (analog and DVB).
10 */
11 #include "dvb-usb-common.h"
12
13 /* URB stuff for streaming */
14 static void usb_urb_complete(struct urb *urb)
15 {
16 struct usb_data_stream *stream = urb->context;
17 int ptype = usb_pipetype(urb->pipe);
18 int i;
19 u8 *b;
20
21 deb_uxfer("'%s' urb completed. status: %d, length: %d/%d, pack_num: %d, errors: %d\n",
22 ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",
23 urb->status,urb->actual_length,urb->transfer_buffer_length,
24 urb->number_of_packets,urb->error_count);
25
26 switch (urb->status) {
27 case 0: /* success */
28 case -ETIMEDOUT: /* NAK */
29 break;
30 case -ECONNRESET: /* kill */
31 case -ENOENT:
32 case -ESHUTDOWN:
33 return;
34 default: /* error */
35 deb_ts("urb completition error %d.\n", urb->status);
36 break;
37 }
38
39 b = (u8 *) urb->transfer_buffer;
40 switch (ptype) {
41 case PIPE_ISOCHRONOUS:
42 for (i = 0; i < urb->number_of_packets; i++) {
43
44 if (urb->iso_frame_desc[i].status != 0)
45 deb_ts("iso frame descriptor has an error: %d\n",urb->iso_frame_desc[i].status);
46 else if (urb->iso_frame_desc[i].actual_length > 0)
47 stream->complete(stream, b + urb->iso_frame_desc[i].offset, urb->iso_frame_desc[i].actual_length);
48
49 urb->iso_frame_desc[i].status = 0;
50 urb->iso_frame_desc[i].actual_length = 0;
51 }
52 debug_dump(b,20,deb_uxfer);
53 break;
54 case PIPE_BULK:
55 if (urb->actual_length > 0)
56 stream->complete(stream, b, urb->actual_length);
57 break;
58 default:
59 err("unkown endpoint type in completition handler.");
60 return;
61 }
62 usb_submit_urb(urb,GFP_ATOMIC);
63 }
64
65 int usb_urb_kill(struct usb_data_stream *stream)
66 {
67 int i;
68 for (i = 0; i < stream->urbs_submitted; i++) {
69 deb_ts("killing URB no. %d.\n",i);
70
71 /* stop the URB */
72 usb_kill_urb(stream->urb_list[i]);
73 }
74 stream->urbs_submitted = 0;
75 return 0;
76 }
77
78 int usb_urb_submit(struct usb_data_stream *stream)
79 {
80 int i,ret;
81 for (i = 0; i < stream->urbs_initialized; i++) {
82 deb_ts("submitting URB no. %d\n",i);
83 if ((ret = usb_submit_urb(stream->urb_list[i],GFP_ATOMIC))) {
84 err("could not submit URB no. %d - get them all back",i);
85 usb_urb_kill(stream);
86 return ret;
87 }
88 stream->urbs_submitted++;
89 }
90 return 0;
91 }
92
93 static int usb_free_stream_buffers(struct usb_data_stream *stream)
94 {
95 if (stream->state & USB_STATE_URB_BUF) {
96 while (stream->buf_num) {
97 stream->buf_num--;
98 deb_mem("freeing buffer %d\n",stream->buf_num);
99 usb_buffer_free(stream->udev, stream->buf_size,
100 stream->buf_list[stream->buf_num], stream->dma_addr[stream->buf_num]);
101 }
102 }
103
104 stream->state &= ~USB_STATE_URB_BUF;
105
106 return 0;
107 }
108
109 static int usb_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size)
110 {
111 stream->buf_num = 0;
112 stream->buf_size = size;
113
114 deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
115
116 for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
117 deb_mem("allocating buffer %d\n",stream->buf_num);
118 if (( stream->buf_list[stream->buf_num] =
119 usb_buffer_alloc(stream->udev, size, GFP_ATOMIC,
120 &stream->dma_addr[stream->buf_num]) ) == NULL) {
121 deb_mem("not enough memory for urb-buffer allocation.\n");
122 usb_free_stream_buffers(stream);
123 return -ENOMEM;
124 }
125 deb_mem("buffer %d: %p (dma: %Lu)\n",
126 stream->buf_num,
127 stream->buf_list[stream->buf_num], (long long)stream->dma_addr[stream->buf_num]);
128 memset(stream->buf_list[stream->buf_num],0,size);
129 stream->state |= USB_STATE_URB_BUF;
130 }
131 deb_mem("allocation successful\n");
132
133 return 0;
134 }
135
136 static int usb_bulk_urb_init(struct usb_data_stream *stream)
137 {
138 int i;
139
140 if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
141 stream->props.u.bulk.buffersize)) < 0)
142 return i;
143
144 /* allocate the URBs */
145 for (i = 0; i < stream->props.count; i++) {
146 if ((stream->urb_list[i] = usb_alloc_urb(0,GFP_ATOMIC)) == NULL)
147 return -ENOMEM;
148
149 usb_fill_bulk_urb( stream->urb_list[i], stream->udev,
150 usb_rcvbulkpipe(stream->udev,stream->props.endpoint),
151 stream->buf_list[i],
152 stream->props.u.bulk.buffersize,
153 usb_urb_complete, stream);
154
155 stream->urb_list[i]->transfer_flags = 0;
156 stream->urbs_initialized++;
157 }
158 return 0;
159 }
160
161 static int usb_isoc_urb_init(struct usb_data_stream *stream)
162 {
163 int i,j;
164
165 if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
166 stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)
167 return i;
168
169 /* allocate the URBs */
170 for (i = 0; i < stream->props.count; i++) {
171 struct urb *urb;
172 int frame_offset = 0;
173 if ((stream->urb_list[i] =
174 usb_alloc_urb(stream->props.u.isoc.framesperurb,GFP_ATOMIC)) == NULL)
175 return -ENOMEM;
176
177 urb = stream->urb_list[i];
178
179 urb->dev = stream->udev;
180 urb->context = stream;
181 urb->complete = usb_urb_complete;
182 urb->pipe = usb_rcvisocpipe(stream->udev,stream->props.endpoint);
183 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
184 urb->interval = stream->props.u.isoc.interval;
185 urb->number_of_packets = stream->props.u.isoc.framesperurb;
186 urb->transfer_buffer_length = stream->buf_size;
187 urb->transfer_buffer = stream->buf_list[i];
188 urb->transfer_dma = stream->dma_addr[i];
189
190 for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
191 urb->iso_frame_desc[j].offset = frame_offset;
192 urb->iso_frame_desc[j].length = stream->props.u.isoc.framesize;
193 frame_offset += stream->props.u.isoc.framesize;
194 }
195
196 stream->urbs_initialized++;
197 }
198 return 0;
199 }
200
201 int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)
202 {
203 if (stream == NULL || props == NULL)
204 return -EINVAL;
205
206 memcpy(&stream->props, props, sizeof(*props));
207
208 usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint));
209
210 if (stream->complete == NULL) {
211 err("there is no data callback - this doesn't make sense.");
212 return -EINVAL;
213 }
214
215 switch (stream->props.type) {
216 case USB_BULK:
217 return usb_bulk_urb_init(stream);
218 case USB_ISOC:
219 return usb_isoc_urb_init(stream);
220 default:
221 err("unkown URB-type for data transfer.");
222 return -EINVAL;
223 }
224 }
225
226 int usb_urb_exit(struct usb_data_stream *stream)
227 {
228 int i;
229
230 usb_urb_kill(stream);
231
232 for (i = 0; i < stream->urbs_initialized; i++) {
233 if (stream->urb_list[i] != NULL) {
234 deb_mem("freeing URB no. %d.\n",i);
235 /* free the URBs */
236 usb_free_urb(stream->urb_list[i]);
237 }
238 }
239 stream->urbs_initialized = 0;
240
241 usb_free_stream_buffers(stream);
242 return 0;
243 }
244
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