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1// SPDX-License-Identifier: GPL-2.02/* usb-urb.c is part of the DVB USB library.3 *4 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)5 * see dvb-usb-init.c for copyright information.6 *7 * This file keeps functions for initializing and handling the8 * BULK and ISOC USB data transfers in a generic way.9 * Can be used for DVB-only and also, that's the plan, for10 * Hybrid USB devices (analog and DVB).11 */12#include "dvb_usb_common.h"13 14/* URB stuff for streaming */15 16int usb_urb_reconfig(struct usb_data_stream *stream,17 struct usb_data_stream_properties *props);18 19static void usb_urb_complete(struct urb *urb)20{21 struct usb_data_stream *stream = urb->context;22 int ptype = usb_pipetype(urb->pipe);23 int i;24 u8 *b;25 26 dev_dbg_ratelimited(&stream->udev->dev,27 "%s: %s urb completed status=%d length=%d/%d pack_num=%d errors=%d\n",28 __func__, ptype == PIPE_ISOCHRONOUS ? "isoc" : "bulk",29 urb->status, urb->actual_length,30 urb->transfer_buffer_length,31 urb->number_of_packets, urb->error_count);32 33 switch (urb->status) {34 case 0: /* success */35 case -ETIMEDOUT: /* NAK */36 break;37 case -ECONNRESET: /* kill */38 case -ENOENT:39 case -ESHUTDOWN:40 return;41 default: /* error */42 dev_dbg_ratelimited(&stream->udev->dev,43 "%s: urb completion failed=%d\n",44 __func__, urb->status);45 break;46 }47 48 b = (u8 *) urb->transfer_buffer;49 switch (ptype) {50 case PIPE_ISOCHRONOUS:51 for (i = 0; i < urb->number_of_packets; i++) {52 if (urb->iso_frame_desc[i].status != 0)53 dev_dbg(&stream->udev->dev,54 "%s: iso frame descriptor has an error=%d\n",55 __func__,56 urb->iso_frame_desc[i].status);57 else if (urb->iso_frame_desc[i].actual_length > 0)58 stream->complete(stream,59 b + urb->iso_frame_desc[i].offset,60 urb->iso_frame_desc[i].actual_length);61 62 urb->iso_frame_desc[i].status = 0;63 urb->iso_frame_desc[i].actual_length = 0;64 }65 break;66 case PIPE_BULK:67 if (urb->actual_length > 0)68 stream->complete(stream, b, urb->actual_length);69 break;70 default:71 dev_err(&stream->udev->dev,72 "%s: unknown endpoint type in completion handler\n",73 KBUILD_MODNAME);74 return;75 }76 usb_submit_urb(urb, GFP_ATOMIC);77}78 79int usb_urb_killv2(struct usb_data_stream *stream)80{81 int i;82 for (i = 0; i < stream->urbs_submitted; i++) {83 dev_dbg(&stream->udev->dev, "%s: kill urb=%d\n", __func__, i);84 /* stop the URB */85 usb_kill_urb(stream->urb_list[i]);86 }87 stream->urbs_submitted = 0;88 return 0;89}90 91int usb_urb_submitv2(struct usb_data_stream *stream,92 struct usb_data_stream_properties *props)93{94 int i, ret;95 96 if (props) {97 ret = usb_urb_reconfig(stream, props);98 if (ret < 0)99 return ret;100 }101 102 for (i = 0; i < stream->urbs_initialized; i++) {103 dev_dbg(&stream->udev->dev, "%s: submit urb=%d\n", __func__, i);104 ret = usb_submit_urb(stream->urb_list[i], GFP_ATOMIC);105 if (ret) {106 dev_err(&stream->udev->dev,107 "%s: could not submit urb no. %d - get them all back\n",108 KBUILD_MODNAME, i);109 usb_urb_killv2(stream);110 return ret;111 }112 stream->urbs_submitted++;113 }114 return 0;115}116 117static int usb_urb_free_urbs(struct usb_data_stream *stream)118{119 int i;120 121 usb_urb_killv2(stream);122 123 for (i = stream->urbs_initialized - 1; i >= 0; i--) {124 if (stream->urb_list[i]) {125 dev_dbg(&stream->udev->dev, "%s: free urb=%d\n",126 __func__, i);127 /* free the URBs */128 usb_free_urb(stream->urb_list[i]);129 }130 }131 stream->urbs_initialized = 0;132 133 return 0;134}135 136static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)137{138 int i, j;139 140 /* allocate the URBs */141 for (i = 0; i < stream->props.count; i++) {142 dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);143 stream->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);144 if (!stream->urb_list[i]) {145 dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);146 for (j = 0; j < i; j++)147 usb_free_urb(stream->urb_list[j]);148 return -ENOMEM;149 }150 usb_fill_bulk_urb(stream->urb_list[i],151 stream->udev,152 usb_rcvbulkpipe(stream->udev,153 stream->props.endpoint),154 stream->buf_list[i],155 stream->props.u.bulk.buffersize,156 usb_urb_complete, stream);157 158 stream->urbs_initialized++;159 }160 return 0;161}162 163static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)164{165 int i, j;166 167 /* allocate the URBs */168 for (i = 0; i < stream->props.count; i++) {169 struct urb *urb;170 int frame_offset = 0;171 dev_dbg(&stream->udev->dev, "%s: alloc urb=%d\n", __func__, i);172 stream->urb_list[i] = usb_alloc_urb(173 stream->props.u.isoc.framesperurb, GFP_ATOMIC);174 if (!stream->urb_list[i]) {175 dev_dbg(&stream->udev->dev, "%s: failed\n", __func__);176 for (j = 0; j < i; j++)177 usb_free_urb(stream->urb_list[j]);178 return -ENOMEM;179 }180 181 urb = stream->urb_list[i];182 183 urb->dev = stream->udev;184 urb->context = stream;185 urb->complete = usb_urb_complete;186 urb->pipe = usb_rcvisocpipe(stream->udev,187 stream->props.endpoint);188 urb->transfer_flags = URB_ISO_ASAP;189 urb->interval = stream->props.u.isoc.interval;190 urb->number_of_packets = stream->props.u.isoc.framesperurb;191 urb->transfer_buffer_length = stream->props.u.isoc.framesize *192 stream->props.u.isoc.framesperurb;193 urb->transfer_buffer = stream->buf_list[i];194 195 for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {196 urb->iso_frame_desc[j].offset = frame_offset;197 urb->iso_frame_desc[j].length =198 stream->props.u.isoc.framesize;199 frame_offset += stream->props.u.isoc.framesize;200 }201 202 stream->urbs_initialized++;203 }204 return 0;205}206 207static int usb_free_stream_buffers(struct usb_data_stream *stream)208{209 if (stream->state & USB_STATE_URB_BUF) {210 while (stream->buf_num) {211 stream->buf_num--;212 kfree(stream->buf_list[stream->buf_num]);213 }214 }215 216 stream->state &= ~USB_STATE_URB_BUF;217 218 return 0;219}220 221static int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,222 unsigned long size)223{224 stream->buf_num = 0;225 stream->buf_size = size;226 227 dev_dbg(&stream->udev->dev,228 "%s: all in all I will use %lu bytes for streaming\n",229 __func__, num * size);230 231 for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {232 stream->buf_list[stream->buf_num] = kzalloc(size, GFP_ATOMIC);233 if (!stream->buf_list[stream->buf_num]) {234 dev_dbg(&stream->udev->dev, "%s: alloc buf=%d failed\n",235 __func__, stream->buf_num);236 usb_free_stream_buffers(stream);237 return -ENOMEM;238 }239 240 dev_dbg(&stream->udev->dev, "%s: alloc buf=%d %p (dma %llu)\n",241 __func__, stream->buf_num,242 stream->buf_list[stream->buf_num],243 (long long)stream->dma_addr[stream->buf_num]);244 stream->state |= USB_STATE_URB_BUF;245 }246 247 return 0;248}249 250int usb_urb_reconfig(struct usb_data_stream *stream,251 struct usb_data_stream_properties *props)252{253 int buf_size;254 255 if (!props)256 return 0;257 258 /* check allocated buffers are large enough for the request */259 if (props->type == USB_BULK) {260 buf_size = stream->props.u.bulk.buffersize;261 } else if (props->type == USB_ISOC) {262 buf_size = props->u.isoc.framesize * props->u.isoc.framesperurb;263 } else {264 dev_err(&stream->udev->dev, "%s: invalid endpoint type=%d\n",265 KBUILD_MODNAME, props->type);266 return -EINVAL;267 }268 269 if (stream->buf_num < props->count || stream->buf_size < buf_size) {270 dev_err(&stream->udev->dev,271 "%s: cannot reconfigure as allocated buffers are too small\n",272 KBUILD_MODNAME);273 return -EINVAL;274 }275 276 /* check if all fields are same */277 if (stream->props.type == props->type &&278 stream->props.count == props->count &&279 stream->props.endpoint == props->endpoint) {280 if (props->type == USB_BULK &&281 props->u.bulk.buffersize ==282 stream->props.u.bulk.buffersize)283 return 0;284 else if (props->type == USB_ISOC &&285 props->u.isoc.framesperurb ==286 stream->props.u.isoc.framesperurb &&287 props->u.isoc.framesize ==288 stream->props.u.isoc.framesize &&289 props->u.isoc.interval ==290 stream->props.u.isoc.interval)291 return 0;292 }293 294 dev_dbg(&stream->udev->dev, "%s: re-alloc urbs\n", __func__);295 296 usb_urb_free_urbs(stream);297 memcpy(&stream->props, props, sizeof(*props));298 if (props->type == USB_BULK)299 return usb_urb_alloc_bulk_urbs(stream);300 else if (props->type == USB_ISOC)301 return usb_urb_alloc_isoc_urbs(stream);302 303 return 0;304}305 306int usb_urb_initv2(struct usb_data_stream *stream,307 const struct usb_data_stream_properties *props)308{309 int ret;310 311 if (!stream || !props)312 return -EINVAL;313 314 memcpy(&stream->props, props, sizeof(*props));315 316 if (!stream->complete) {317 dev_err(&stream->udev->dev,318 "%s: there is no data callback - this doesn't make sense\n",319 KBUILD_MODNAME);320 return -EINVAL;321 }322 323 switch (stream->props.type) {324 case USB_BULK:325 ret = usb_alloc_stream_buffers(stream, stream->props.count,326 stream->props.u.bulk.buffersize);327 if (ret < 0)328 return ret;329 330 return usb_urb_alloc_bulk_urbs(stream);331 case USB_ISOC:332 ret = usb_alloc_stream_buffers(stream, stream->props.count,333 stream->props.u.isoc.framesize *334 stream->props.u.isoc.framesperurb);335 if (ret < 0)336 return ret;337 338 return usb_urb_alloc_isoc_urbs(stream);339 default:340 dev_err(&stream->udev->dev,341 "%s: unknown urb-type for data transfer\n",342 KBUILD_MODNAME);343 return -EINVAL;344 }345}346 347int usb_urb_exitv2(struct usb_data_stream *stream)348{349 usb_urb_free_urbs(stream);350 usb_free_stream_buffers(stream);351 352 return 0;353}354