0d4bcbab68072ddf586b5aa188d14719fc7a9695
[fw/openocd] / src / jtag / drivers / libusb1_common.c
1 /***************************************************************************
2  *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
3  *                                                                         *
4  *   Copyright (C) 2011 by Mauro Gamba <maurillo71@gmail.com>              *
5  *                                                                         *
6  *   This program is free software; you can redistribute it and/or modify  *
7  *   it under the terms of the GNU General Public License as published by  *
8  *   the Free Software Foundation; either version 2 of the License, or     *
9  *   (at your option) any later version.                                   *
10  *                                                                         *
11  *   This program is distributed in the hope that it will be useful,       *
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
14  *   GNU General Public License for more details.                          *
15  *                                                                         *
16  *   You should have received a copy of the GNU General Public License     *
17  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
18  ***************************************************************************/
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23 #include <jtag/drivers/jtag_usb_common.h>
24 #include "libusb1_common.h"
25 #include "log.h"
26
27 /*
28  * comment from libusb:
29  * As per the USB 3.0 specs, the current maximum limit for the depth is 7.
30  */
31 #define MAX_USB_PORTS   7
32
33 static struct libusb_context *jtag_libusb_context; /**< Libusb context **/
34 static libusb_device **devs; /**< The usb device list **/
35
36 static int jtag_libusb_error(int err)
37 {
38         switch (err) {
39         case LIBUSB_SUCCESS:
40                 return ERROR_OK;
41         case LIBUSB_ERROR_TIMEOUT:
42                 return ERROR_TIMEOUT_REACHED;
43         case LIBUSB_ERROR_IO:
44         case LIBUSB_ERROR_INVALID_PARAM:
45         case LIBUSB_ERROR_ACCESS:
46         case LIBUSB_ERROR_NO_DEVICE:
47         case LIBUSB_ERROR_NOT_FOUND:
48         case LIBUSB_ERROR_BUSY:
49         case LIBUSB_ERROR_OVERFLOW:
50         case LIBUSB_ERROR_PIPE:
51         case LIBUSB_ERROR_INTERRUPTED:
52         case LIBUSB_ERROR_NO_MEM:
53         case LIBUSB_ERROR_NOT_SUPPORTED:
54         case LIBUSB_ERROR_OTHER:
55                 return ERROR_FAIL;
56         default:
57                 return ERROR_FAIL;
58         }
59 }
60
61 static bool jtag_libusb_match(struct libusb_device_descriptor *dev_desc,
62                 const uint16_t vids[], const uint16_t pids[])
63 {
64         for (unsigned i = 0; vids[i]; i++) {
65                 if (dev_desc->idVendor == vids[i] &&
66                         dev_desc->idProduct == pids[i]) {
67                         return true;
68                 }
69         }
70         return false;
71 }
72
73 #ifdef HAVE_LIBUSB_GET_PORT_NUMBERS
74 static bool jtag_libusb_location_equal(libusb_device *device)
75 {
76         uint8_t port_path[MAX_USB_PORTS];
77         uint8_t dev_bus;
78         int path_len;
79
80         path_len = libusb_get_port_numbers(device, port_path, MAX_USB_PORTS);
81         if (path_len == LIBUSB_ERROR_OVERFLOW) {
82                 LOG_WARNING("cannot determine path to usb device! (more than %i ports in path)\n",
83                         MAX_USB_PORTS);
84                 return false;
85         }
86         dev_bus = libusb_get_bus_number(device);
87
88         return jtag_usb_location_equal(dev_bus, port_path, path_len);
89 }
90 #else /* HAVE_LIBUSB_GET_PORT_NUMBERS */
91 static bool jtag_libusb_location_equal(libusb_device *device)
92 {
93         return true;
94 }
95 #endif /* HAVE_LIBUSB_GET_PORT_NUMBERS */
96
97
98 /* Returns true if the string descriptor indexed by str_index in device matches string */
99 static bool string_descriptor_equal(libusb_device_handle *device, uint8_t str_index,
100                                                                         const char *string)
101 {
102         int retval;
103         bool matched;
104         char desc_string[256+1]; /* Max size of string descriptor */
105
106         if (str_index == 0)
107                 return false;
108
109         retval = libusb_get_string_descriptor_ascii(device, str_index,
110                         (unsigned char *)desc_string, sizeof(desc_string)-1);
111         if (retval < 0) {
112                 LOG_ERROR("libusb_get_string_descriptor_ascii() failed with %d", retval);
113                 return false;
114         }
115
116         /* Null terminate descriptor string in case it needs to be logged. */
117         desc_string[sizeof(desc_string)-1] = '\0';
118
119         matched = strncmp(string, desc_string, sizeof(desc_string)) == 0;
120         if (!matched)
121                 LOG_DEBUG("Device serial number '%s' doesn't match requested serial '%s'",
122                         desc_string, string);
123         return matched;
124 }
125
126 int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
127                 const char *serial,
128                 struct jtag_libusb_device_handle **out)
129 {
130         int cnt, idx, errCode;
131         int retval = ERROR_FAIL;
132         bool serial_mismatch = false;
133         struct jtag_libusb_device_handle *libusb_handle = NULL;
134
135         if (libusb_init(&jtag_libusb_context) < 0)
136                 return ERROR_FAIL;
137
138         cnt = libusb_get_device_list(jtag_libusb_context, &devs);
139
140         for (idx = 0; idx < cnt; idx++) {
141                 struct libusb_device_descriptor dev_desc;
142
143                 if (libusb_get_device_descriptor(devs[idx], &dev_desc) != 0)
144                         continue;
145
146                 if (!jtag_libusb_match(&dev_desc, vids, pids))
147                         continue;
148
149                 if (jtag_usb_get_location() && !jtag_libusb_location_equal(devs[idx]))
150                         continue;
151
152                 errCode = libusb_open(devs[idx], &libusb_handle);
153
154                 if (errCode) {
155                         LOG_ERROR("libusb_open() failed with %s",
156                                   libusb_error_name(errCode));
157                         continue;
158                 }
159
160                 /* Device must be open to use libusb_get_string_descriptor_ascii. */
161                 if (serial != NULL &&
162                                 !string_descriptor_equal(libusb_handle, dev_desc.iSerialNumber, serial)) {
163                         serial_mismatch = true;
164                         libusb_close(libusb_handle);
165                         continue;
166                 }
167
168                 /* Success. */
169                 *out = libusb_handle;
170                 retval = ERROR_OK;
171                 serial_mismatch = false;
172                 break;
173         }
174         if (cnt >= 0)
175                 libusb_free_device_list(devs, 1);
176
177         if (serial_mismatch)
178                 LOG_INFO("No device matches the serial string");
179
180         return retval;
181 }
182
183 void jtag_libusb_close(jtag_libusb_device_handle *dev)
184 {
185         /* Close device */
186         libusb_close(dev);
187
188         libusb_exit(jtag_libusb_context);
189 }
190
191 int jtag_libusb_control_transfer(jtag_libusb_device_handle *dev, uint8_t requestType,
192                 uint8_t request, uint16_t wValue, uint16_t wIndex, char *bytes,
193                 uint16_t size, unsigned int timeout)
194 {
195         int transferred = 0;
196
197         transferred = libusb_control_transfer(dev, requestType, request, wValue, wIndex,
198                                 (unsigned char *)bytes, size, timeout);
199
200         if (transferred < 0)
201                 transferred = 0;
202
203         return transferred;
204 }
205
206 int jtag_libusb_bulk_write(jtag_libusb_device_handle *dev, int ep, char *bytes,
207                            int size, int timeout, int *transferred)
208 {
209         int ret;
210
211         *transferred = 0;
212
213         ret = libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
214                                    transferred, timeout);
215         if (ret != LIBUSB_SUCCESS) {
216                 LOG_ERROR("libusb_bulk_write error: %s", libusb_error_name(ret));
217                 return jtag_libusb_error(ret);
218         }
219
220         return ERROR_OK;
221 }
222
223 int jtag_libusb_bulk_read(jtag_libusb_device_handle *dev, int ep, char *bytes,
224                           int size, int timeout, int *transferred)
225 {
226         int ret;
227
228         *transferred = 0;
229
230         ret = libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
231                                    transferred, timeout);
232         if (ret != LIBUSB_SUCCESS) {
233                 LOG_ERROR("libusb_bulk_read error: %s", libusb_error_name(ret));
234                 return jtag_libusb_error(ret);
235         }
236
237         return ERROR_OK;
238 }
239
240 int jtag_libusb_set_configuration(jtag_libusb_device_handle *devh,
241                 int configuration)
242 {
243         struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
244         int retCode = -99;
245
246         struct libusb_config_descriptor *config = NULL;
247         int current_config = -1;
248
249         retCode = libusb_get_configuration(devh, &current_config);
250         if (retCode != 0)
251                 return retCode;
252
253         retCode = libusb_get_config_descriptor(udev, configuration, &config);
254         if (retCode != 0 || config == NULL)
255                 return retCode;
256
257         /* Only change the configuration if it is not already set to the
258            same one. Otherwise this issues a lightweight reset and hangs
259            LPC-Link2 with JLink firmware. */
260         if (current_config != config->bConfigurationValue)
261                 retCode = libusb_set_configuration(devh, config->bConfigurationValue);
262
263         libusb_free_config_descriptor(config);
264
265         return retCode;
266 }
267
268 int jtag_libusb_choose_interface(struct jtag_libusb_device_handle *devh,
269                 unsigned int *usb_read_ep,
270                 unsigned int *usb_write_ep,
271                 int bclass, int subclass, int protocol, int trans_type)
272 {
273         struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
274         const struct libusb_interface *inter;
275         const struct libusb_interface_descriptor *interdesc;
276         const struct libusb_endpoint_descriptor *epdesc;
277         struct libusb_config_descriptor *config;
278
279         *usb_read_ep = *usb_write_ep = 0;
280
281         libusb_get_config_descriptor(udev, 0, &config);
282         for (int i = 0; i < (int)config->bNumInterfaces; i++) {
283                 inter = &config->interface[i];
284
285                 interdesc = &inter->altsetting[0];
286                 for (int k = 0;
287                      k < (int)interdesc->bNumEndpoints; k++) {
288                         if ((bclass > 0 && interdesc->bInterfaceClass != bclass) ||
289                             (subclass > 0 && interdesc->bInterfaceSubClass != subclass) ||
290                             (protocol > 0 && interdesc->bInterfaceProtocol != protocol))
291                                 continue;
292
293                         epdesc = &interdesc->endpoint[k];
294                         if (trans_type > 0 && (epdesc->bmAttributes & 0x3) != trans_type)
295                                 continue;
296
297                         uint8_t epnum = epdesc->bEndpointAddress;
298                         bool is_input = epnum & 0x80;
299                         LOG_DEBUG("usb ep %s %02x",
300                                   is_input ? "in" : "out", epnum);
301
302                         if (is_input)
303                                 *usb_read_ep = epnum;
304                         else
305                                 *usb_write_ep = epnum;
306
307                         if (*usb_read_ep && *usb_write_ep) {
308                                 LOG_DEBUG("Claiming interface %d", (int)interdesc->bInterfaceNumber);
309                                 libusb_claim_interface(devh, (int)interdesc->bInterfaceNumber);
310                                 libusb_free_config_descriptor(config);
311                                 return ERROR_OK;
312                         }
313                 }
314         }
315         libusb_free_config_descriptor(config);
316
317         return ERROR_FAIL;
318 }
319
320 int jtag_libusb_get_pid(struct jtag_libusb_device *dev, uint16_t *pid)
321 {
322         struct libusb_device_descriptor dev_desc;
323
324         if (libusb_get_device_descriptor(dev, &dev_desc) == 0) {
325                 *pid = dev_desc.idProduct;
326
327                 return ERROR_OK;
328         }
329
330         return ERROR_FAIL;
331 }