96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/* *****************************************************************************
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* Copyright (c) 2013 Benjamin Krill <benjamin@krll.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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* ****************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <usb.h>
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#include <string.h>
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#include <endian.h>
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#include <strm.h>
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#define DEBUG 0
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#if defined(DEBUG) && DEBUG == 1
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#define printf_dbg(fmt, args...) printf(fmt, ## args)
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#else
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#define printf_dbg(args...)
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#endif
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static usb_dev_handle *hd = NULL;
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/* TODO: extend to support multiple USB device on one host! */
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static struct usb_device *
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find_device(struct usb_bus* busses, int vendor, int product)
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{
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struct usb_bus *bus;
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struct usb_device *dev;
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for (bus = busses; bus; bus = bus->next) {
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printf_dbg("scanning bus %s\n", bus->dirname);
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for (dev = bus->devices; dev; dev=dev->next) {
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/* compare device vendor and product */
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if ((dev->descriptor.idVendor == vendor) &&
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(dev->descriptor.idProduct == product)) {
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/* print device information */
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printf_dbg("\tfound device %s bus %s (idVendor 0x%04x idProduct 0x%04x)\n",
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dev->filename, dev->bus->dirname, dev->descriptor.idVendor,
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dev->descriptor.idProduct);
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return dev;
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} else {
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printf_dbg("\tdevice %s does not match\n", dev->filename);
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}
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}
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}
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return NULL;
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}
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usb_dev_handle *
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strm_init(int vendor, int product)
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{
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struct usb_device *dev;
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usb_init();
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usb_find_busses();
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usb_find_devices();
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if ((dev = find_device(usb_get_busses(), vendor, product)) == NULL)
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return NULL;
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if (!(hd = usb_open(dev))) {
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printf("FAILED: cannot open device.\n");
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return NULL;
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}
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/* reset usb device */
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usb_reset(hd);
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printf_dbg("Lets do the magic (%p) ...\n", hd);
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return hd;
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}
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int
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strm_fini(void)
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{
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if (hd)
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usb_close(hd);
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hd = NULL;
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return 0;
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}
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