libam7xxx  0.1
Communication library for Actions Micro AM7XXX based USB projectors and DPFs
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am7xxx-modeswitch.c
1 /* am7xxx-modeswitch - a simple usb-modeswitch for am7xxx devices
2  *
3  * Copyright (C) 2012-2014 Antonio Ospite <ao2@ao2.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 3 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 }