9da2cc95ca133990115ffeaab2a4f89f931e95a3
[linux-2.6.git] / drivers / media / dvb / dvb-usb / usb-urb.c
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, j;
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                 stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
147                 if (!stream->urb_list[i]) {
148                         deb_mem("not enough memory for urb_alloc_urb!.\n");
149                         for (j = 0; j < i; j++)
150                                 usb_free_urb(stream->urb_list[i]);
151                         return -ENOMEM;
152                 }
153                 usb_fill_bulk_urb( stream->urb_list[i], stream->udev,
154                                 usb_rcvbulkpipe(stream->udev,stream->props.endpoint),
155                                 stream->buf_list[i],
156                                 stream->props.u.bulk.buffersize,
157                                 usb_urb_complete, stream);
158
159                 stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
160                 stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
161                 stream->urbs_initialized++;
162         }
163         return 0;
164 }
165
166 static int usb_isoc_urb_init(struct usb_data_stream *stream)
167 {
168         int i,j;
169
170         if ((i = usb_allocate_stream_buffers(stream,stream->props.count,
171                                         stream->props.u.isoc.framesize*stream->props.u.isoc.framesperurb)) < 0)
172                 return i;
173
174         /* allocate the URBs */
175         for (i = 0; i < stream->props.count; i++) {
176                 struct urb *urb;
177                 int frame_offset = 0;
178
179                 stream->urb_list[i] = usb_alloc_urb(stream->props.u.isoc.framesperurb, GFP_ATOMIC);
180                 if (!stream->urb_list[i]) {
181                         deb_mem("not enough memory for urb_alloc_urb!\n");
182                         for (j = 0; j < i; j++)
183                                 usb_free_urb(stream->urb_list[i]);
184                         return -ENOMEM;
185                 }
186
187                 urb = stream->urb_list[i];
188
189                 urb->dev = stream->udev;
190                 urb->context = stream;
191                 urb->complete = usb_urb_complete;
192                 urb->pipe = usb_rcvisocpipe(stream->udev,stream->props.endpoint);
193                 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
194                 urb->interval = stream->props.u.isoc.interval;
195                 urb->number_of_packets = stream->props.u.isoc.framesperurb;
196                 urb->transfer_buffer_length = stream->buf_size;
197                 urb->transfer_buffer = stream->buf_list[i];
198                 urb->transfer_dma = stream->dma_addr[i];
199
200                 for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
201                         urb->iso_frame_desc[j].offset = frame_offset;
202                         urb->iso_frame_desc[j].length = stream->props.u.isoc.framesize;
203                         frame_offset += stream->props.u.isoc.framesize;
204                 }
205
206                 stream->urbs_initialized++;
207         }
208         return 0;
209 }
210
211 int usb_urb_init(struct usb_data_stream *stream, struct usb_data_stream_properties *props)
212 {
213         if (stream == NULL || props == NULL)
214                 return -EINVAL;
215
216         memcpy(&stream->props, props, sizeof(*props));
217
218         usb_clear_halt(stream->udev,usb_rcvbulkpipe(stream->udev,stream->props.endpoint));
219
220         if (stream->complete == NULL) {
221                 err("there is no data callback - this doesn't make sense.");
222                 return -EINVAL;
223         }
224
225         switch (stream->props.type) {
226                 case USB_BULK:
227                         return usb_bulk_urb_init(stream);
228                 case USB_ISOC:
229                         return usb_isoc_urb_init(stream);
230                 default:
231                         err("unkown URB-type for data transfer.");
232                         return -EINVAL;
233         }
234 }
235
236 int usb_urb_exit(struct usb_data_stream *stream)
237 {
238         int i;
239
240         usb_urb_kill(stream);
241
242         for (i = 0; i < stream->urbs_initialized; i++) {
243                 if (stream->urb_list[i] != NULL) {
244                         deb_mem("freeing URB no. %d.\n",i);
245                         /* free the URBs */
246                         usb_free_urb(stream->urb_list[i]);
247                 }
248         }
249         stream->urbs_initialized = 0;
250
251         usb_free_stream_buffers(stream);
252         return 0;
253 }