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 */
usb_urb_complete(struct urb * urb)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("unknown endpoint type in completition handler.");
60 return;
61 }
62 usb_submit_urb(urb,GFP_ATOMIC);
63 }
64
usb_urb_kill(struct usb_data_stream * stream)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
usb_urb_submit(struct usb_data_stream * stream)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
usb_free_stream_buffers(struct usb_data_stream * stream)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_free_coherent(stream->udev, stream->buf_size,
100 stream->buf_list[stream->buf_num],
101 stream->dma_addr[stream->buf_num]);
102 }
103 }
104
105 stream->state &= ~USB_STATE_URB_BUF;
106
107 return 0;
108 }
109
usb_allocate_stream_buffers(struct usb_data_stream * stream,int num,unsigned long size)110 static int usb_allocate_stream_buffers(struct usb_data_stream *stream, int num, unsigned long size)
111 {
112 stream->buf_num = 0;
113 stream->buf_size = size;
114
115 deb_mem("all in all I will use %lu bytes for streaming\n",num*size);
116
117 for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
118 deb_mem("allocating buffer %d\n",stream->buf_num);
119 if (( stream->buf_list[stream->buf_num] =
120 usb_alloc_coherent(stream->udev, size, GFP_ATOMIC,
121 &stream->dma_addr[stream->buf_num]) ) == NULL) {
122 deb_mem("not enough memory for urb-buffer allocation.\n");
123 usb_free_stream_buffers(stream);
124 return -ENOMEM;
125 }
126 deb_mem("buffer %d: %p (dma: %Lu)\n",
127 stream->buf_num,
128 stream->buf_list[stream->buf_num], (long long)stream->dma_addr[stream->buf_num]);
129 memset(stream->buf_list[stream->buf_num],0,size);
130 stream->state |= USB_STATE_URB_BUF;
131 }
132 deb_mem("allocation successful\n");
133
134 return 0;
135 }
136
usb_bulk_urb_init(struct usb_data_stream * stream)137 static int usb_bulk_urb_init(struct usb_data_stream *stream)
138 {
139 int i, j;
140
141 if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
142 stream->props.u.bulk.buffersize)) < 0)
143 return i;
144
145 /* allocate the URBs */
146 for (i = 0; i < stream->props.count; i++) {
147 stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
148 if (!stream->urb_list[i]) {
149 deb_mem("not enough memory for urb_alloc_urb!.\n");
150 for (j = 0; j < i; j++)
151 usb_free_urb(stream->urb_list[j]);
152 return -ENOMEM;
153 }
154 usb_fill_bulk_urb( stream->urb_list[i], stream->udev,
155 usb_rcvbulkpipe(stream->udev,stream->props.endpoint),
156 stream->buf_list[i],
157 stream->props.u.bulk.buffersize,
158 usb_urb_complete, stream);
159
160 stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
161 stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
162 stream->urbs_initialized++;
163 }
164 return 0;
165 }
166
usb_isoc_urb_init(struct usb_data_stream * stream)167 static int usb_isoc_urb_init(struct usb_data_stream *stream)
168 {
169 int i,j;
170
171 if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
172 stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)
173 return i;
174
175 /* allocate the URBs */
176 for (i = 0; i < stream->props.count; i++) {
177 struct urb *urb;
178 int frame_offset = 0;
179
180 stream->urb_list[i] = usb_alloc_urb(stream->props.u.isoc.framesperurb, GFP_ATOMIC);
181 if (!stream->urb_list[i]) {
182 deb_mem("not enough memory for urb_alloc_urb!\n");
183 for (j = 0; j < i; j++)
184 usb_free_urb(stream->urb_list[j]);
185 return -ENOMEM;
186 }
187
188 urb = stream->urb_list[i];
189
190 urb->dev = stream->udev;
191 urb->context = stream;
192 urb->complete = usb_urb_complete;
193 urb->pipe = usb_rcvisocpipe(stream->udev,stream->props.endpoint);
194 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
195 urb->interval = stream->props.u.isoc.interval;
196 urb->number_of_packets = stream->props.u.isoc.framesperurb;
197 urb->transfer_buffer_length = stream->buf_size;
198 urb->transfer_buffer = stream->buf_list[i];
199 urb->transfer_dma = stream->dma_addr[i];
200
201 for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
202 urb->iso_frame_desc[j].offset = frame_offset;
203 urb->iso_frame_desc[j].length = stream->props.u.isoc.framesize;
204 frame_offset += stream->props.u.isoc.framesize;
205 }
206
207 stream->urbs_initialized++;
208 }
209 return 0;
210 }
211
usb_urb_init(struct usb_data_stream * stream,struct usb_data_stream_properties * props)212 int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)
213 {
214 if (stream == NULL || props == NULL)
215 return -EINVAL;
216
217 memcpy(&stream->props, props, sizeof(*props));
218
219 usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint));
220
221 if (stream->complete == NULL) {
222 err("there is no data callback - this doesn't make sense.");
223 return -EINVAL;
224 }
225
226 switch (stream->props.type) {
227 case USB_BULK:
228 return usb_bulk_urb_init(stream);
229 case USB_ISOC:
230 return usb_isoc_urb_init(stream);
231 default:
232 err("unknown URB-type for data transfer.");
233 return -EINVAL;
234 }
235 }
236
usb_urb_exit(struct usb_data_stream * stream)237 int usb_urb_exit(struct usb_data_stream *stream)
238 {
239 int i;
240
241 usb_urb_kill(stream);
242
243 for (i = 0; i < stream->urbs_initialized; i++) {
244 if (stream->urb_list[i] != NULL) {
245 deb_mem("freeing URB no. %d.\n",i);
246 /* free the URBs */
247 usb_free_urb(stream->urb_list[i]);
248 }
249 }
250 stream->urbs_initialized = 0;
251
252 usb_free_stream_buffers(stream);
253 return 0;
254 }
255