1 /*
2 * Copyright (c) 2010 Linux Hotplug Project
3 *
4 * This source code is free software; you can redistribute it
5 * and/or modify it in source code form under the terms of the GNU
6 * General Public License as published by the Free Software
7 * Foundation; either version 2 of the License, or (at your option)
8 * 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, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
18 */
19 /*
20 * This code is based on fxload-libusb for Microsoft Windows project done
21 * by Claudio Favi.
22 */
23 # if !defined(__linux__) || defined(LIBUSB_SUPPORT)
24
25 # include <assert.h>
26 # include <stdio.h>
27 # include <errno.h>
28 # include <limits.h>
29
30 # include <sys/ioctl.h>
31
32 # include <usb.h>
33
34 # include "ezusb.h"
35
36 static int ezusb_libusb_debug = 0;
37 #define DEBUG(...) do { \
38 if (ezusb_libusb_debug) { \
39 printf("%s(%d): ", __func__, __LINE__); \
40 printf(__VA_ARGS__); \
41 printf("\n"); \
42 } \
43 } while (0)
44
45 /*
46 * Issue a control request to the specified device.
47 * This is O/S specific ...
48 */
ctrl_msg_libusb(struct ezusb_backend * backend,unsigned char requestType,unsigned char request,unsigned short value,unsigned short index,unsigned char * data,size_t length)49 int ctrl_msg_libusb (
50 struct ezusb_backend *backend,
51 unsigned char requestType,
52 unsigned char request,
53 unsigned short value,
54 unsigned short index,
55 unsigned char *data,
56 size_t length
57 ) {
58 usb_dev_handle *device;
59 int error;
60
61 assert(backend != NULL && "internal error: no backend");
62 assert(backend->priv_data != NULL && "no private data!");
63
64 device = backend->priv_data;
65 if (requestType == EZUSB_INPUT)
66 requestType = USB_ENDPOINT_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
67 else if (requestType == EZUSB_OUTPUT)
68 requestType = USB_ENDPOINT_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
69
70 error = usb_control_msg(device, (int)requestType, (int)request,
71 (int)value, (int)index, (char*)data, (int)length, 10000);
72 if (error < 0)
73 logerror("problem with usb_control_msg(), returned %d, errno=%d\n",
74 error, errno);
75 return error;
76 }
77
ezusb_libusb_open(struct ezusb_backend * be,const char * device,int mode)78 int ezusb_libusb_open(struct ezusb_backend *be, const char *device, int mode)
79 {
80 struct usb_bus *bus = NULL;
81 struct usb_device *dev = NULL;
82 struct usb_device *found_dev = NULL;
83 usb_dev_handle *devhandle = NULL;
84 int ret = 0;
85 unsigned int vid, pid;
86
87 /*
88 * For this backend, format for device is "vid=<VID>,pid=<PID>"
89 */
90 ret = sscanf(device, "vid=%x,pid=%x", &vid, &pid);
91 if (ret != 2)
92 ret = sscanf(device, "pid=%x,vid=%x", &pid, &vid);
93 if (ret != 2) {
94 logerror("wrong format; expected 'vid=<VID>,pid=<PID>' but got"
95 " '%s'\n", device);
96 return -EINVAL;
97 }
98
99 usb_init();
100 usb_set_debug(0);
101 usb_find_busses();
102 usb_find_devices();
103 for (bus = usb_get_busses(); bus; bus = bus->next) {
104 for (dev = bus->devices; dev; dev = dev->next) {
105 DEBUG("USB device found: vendor: %#x product: %#x",
106 dev->descriptor.idVendor,
107 dev->descriptor.idProduct);
108 if (dev->descriptor.idProduct == pid &&
109 dev->descriptor.idVendor == vid) {
110 found_dev = dev;
111 break;
112 }
113 }
114 }
115 if (found_dev == NULL) {
116 logerror("no device found");
117 return -ENOENT;
118 }
119
120 devhandle = usb_open(found_dev);
121 if (devhandle == NULL) {
122 logerror("couldn't open device handler!");
123 return -ENXIO;
124 }
125 be->priv_data = devhandle;
126 return (0);
127 }
128
ezusb_libusb_close(struct ezusb_backend * be)129 int ezusb_libusb_close(struct ezusb_backend *be)
130 {
131 usb_dev_handle *devhandle = NULL;
132 int error;
133
134 assert(be != NULL && "no backend pointer (NULL)");
135 assert(be->priv_data != NULL && "priv_data can't be NULL here");
136 devhandle = be->priv_data;
137 error = usb_close(devhandle);
138 return error;
139 }
140
141 struct ezusb_backend ezusb_backend_libusb = {
142 .name = "libusb",
143 .priv_data = NULL,
144 .open = ezusb_libusb_open,
145 .close = ezusb_libusb_close,
146 .ctrl_msg = ctrl_msg_libusb,
147 };
148
149 #endif /* LIBUSB_SUPPORT */
150