examples/am7xxx_mode_switch.c

   1 /* am7xxx_mode_switch - a simple usb_mode_switch for am7xxx devices
   2  *
   3  * Copyright (C) 2012  Antonio Ospite <ospite@studenti.unina.it>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <errno.h>
  21 #include <libusb.h>
  22
  23 #define AM7XXX_STORAGE_VID           0x1de1
  24 #define AM7XXX_STORAGE_PID           0x1101
  25 #define AM7XXX_STORAGE_CONFIGURATION 1
  26 #define AM7XXX_STORAGE_INTERFACE     0
  27 #define AM7XXX_STORAGE_OUT_EP        0x01
  28
  29 static unsigned char switch_command[] =
  30         "\x55\x53\x42\x43\x08\x70\x52\x89\x00\x00\x00\x00\x00\x00"
  31         "\x0c\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
  32
  33 int main(void)
  34 {
  35         int ret;
  36         int transferred;
  37         libusb_device_handle *usb_device = NULL;
  38
  39         unsigned int len;
  40
  41         ret = libusb_init(NULL);
  42         if (ret < 0)
  43                 goto out;
  44
  45         libusb_set_debug(NULL, 3);
  46
  47         usb_device = libusb_open_device_with_vid_pid(NULL,
  48                                                      AM7XXX_STORAGE_VID,
  49                                                      AM7XXX_STORAGE_PID);
  50         if (usb_device == NULL) {
  51                 fprintf(stderr, "cannot open the device: %d.\n", errno);
  52                 ret = -errno;
  53                 goto out;
  54         }
  55
  56         if (libusb_kernel_driver_active(usb_device, AM7XXX_STORAGE_INTERFACE)) {
  57                 ret = libusb_detach_kernel_driver(usb_device,
  58                                                   AM7XXX_STORAGE_INTERFACE);
  59                 if (ret < 0)
  60                         fprintf(stderr, "Warning: cannot detach kernel driver.\n");
  61         } else {
  62                 fprintf(stderr, "kernel driver not active.\n");
  63         }
  64
  65         ret = libusb_set_configuration(usb_device, AM7XXX_STORAGE_CONFIGURATION);
  66         if (ret < 0) {
  67                 fprintf(stderr, "cannot set configuration.\n");
  68                 goto out_libusb_close;
  69         }
  70
  71         ret = libusb_claim_interface(usb_device, AM7XXX_STORAGE_INTERFACE);
  72         if (ret < 0) {
  73                 fprintf(stderr, "cannot claim interface.\n");
  74                 goto out_libusb_close;
  75         }
  76
  77         len = sizeof(switch_command);
  78         transferred = 0;
  79         ret = libusb_bulk_transfer(usb_device, AM7XXX_STORAGE_OUT_EP,
  80                                    switch_command, len, &transferred, 0);
  81         if (ret != 0 || (unsigned int)transferred != len) {
  82                 fprintf(stderr, "ret: %d\ttransferred: %d (expected %u)\n",
  83                       ret, transferred, len);
  84                 goto out_libusb_release_interface;
  85         }
  86
  87         fprintf(stderr, "OK, command sent!\n");
  88
  89 out_libusb_release_interface:
  90         libusb_release_interface(usb_device, AM7XXX_STORAGE_INTERFACE);
  91 out_libusb_close:
  92         libusb_close(usb_device);
  93         usb_device = NULL;
  94 out:
  95         libusb_exit(NULL);
  96         return ret;
  97 }