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 */ 14static 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 65int 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 78int 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 93static 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 109static 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, 127stream->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 136static 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 161static 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 201int 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 226int 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