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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <memory.h> | |
24 | #include <glib.h> | |
25 | #include <libusb.h> | |
26 | #include "libsigrok.h" | |
27 | #include "libsigrok-internal.h" | |
28 | ||
29 | /* SR_CONF_CONN takes one of these: */ | |
30 | #define CONN_USB_VIDPID "^([0-9a-z]{4})\\.([0-9a-z]{4})$" | |
31 | #define CONN_USB_BUSADDR "^(\\d+)\\.(\\d+)$" | |
32 | ||
33 | #define LOG_PREFIX "usb" | |
34 | ||
35 | /** | |
36 | * Find USB devices according to a connection string. | |
37 | * | |
38 | * @param usb_ctx libusb context to use while scanning. | |
39 | * @param conn Connection string specifying the device(s) to match. This | |
40 | * can be of the form "<bus>.<address>", or "<vendorid>.<productid>". | |
41 | * | |
42 | * @return A GSList of struct sr_usb_dev_inst, with bus and address fields | |
43 | * matching the device that matched the connection string. The GSList and | |
44 | * its contents must be freed by the caller. | |
45 | */ | |
46 | SR_PRIV GSList *sr_usb_find(libusb_context *usb_ctx, const char *conn) | |
47 | { | |
48 | struct sr_usb_dev_inst *usb; | |
49 | struct libusb_device **devlist; | |
50 | struct libusb_device_descriptor des; | |
51 | GSList *devices; | |
52 | GRegex *reg; | |
53 | GMatchInfo *match; | |
54 | int vid, pid, bus, addr, b, a, ret, i; | |
55 | char *mstr; | |
56 | ||
57 | vid = pid = bus = addr = 0; | |
58 | reg = g_regex_new(CONN_USB_VIDPID, 0, 0, NULL); | |
59 | if (g_regex_match(reg, conn, 0, &match)) { | |
60 | if ((mstr = g_match_info_fetch(match, 1))) | |
61 | vid = strtoul(mstr, NULL, 16); | |
62 | g_free(mstr); | |
63 | ||
64 | if ((mstr = g_match_info_fetch(match, 2))) | |
65 | pid = strtoul(mstr, NULL, 16); | |
66 | g_free(mstr); | |
67 | sr_dbg("Trying to find USB device with VID:PID = %04x:%04x.", | |
68 | vid, pid); | |
69 | } else { | |
70 | g_match_info_unref(match); | |
71 | g_regex_unref(reg); | |
72 | reg = g_regex_new(CONN_USB_BUSADDR, 0, 0, NULL); | |
73 | if (g_regex_match(reg, conn, 0, &match)) { | |
74 | if ((mstr = g_match_info_fetch(match, 1))) | |
75 | bus = strtoul(mstr, NULL, 10); | |
76 | g_free(mstr); | |
77 | ||
78 | if ((mstr = g_match_info_fetch(match, 2))) | |
79 | addr = strtoul(mstr, NULL, 10); | |
80 | g_free(mstr); | |
81 | sr_dbg("Trying to find USB device with bus.address = " | |
82 | "%d.%d.", bus, addr); | |
83 | } | |
84 | } | |
85 | g_match_info_unref(match); | |
86 | g_regex_unref(reg); | |
87 | ||
88 | if (vid + pid + bus + addr == 0) { | |
89 | sr_err("Neither VID:PID nor bus.address was specified."); | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | if (bus > 64) { | |
94 | sr_err("Invalid bus specified: %d.", bus); | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | if (addr > 127) { | |
99 | sr_err("Invalid address specified: %d.", addr); | |
100 | return NULL; | |
101 | } | |
102 | ||
103 | /* Looks like a valid USB device specification, but is it connected? */ | |
104 | devices = NULL; | |
105 | libusb_get_device_list(usb_ctx, &devlist); | |
106 | for (i = 0; devlist[i]; i++) { | |
107 | if ((ret = libusb_get_device_descriptor(devlist[i], &des))) { | |
108 | sr_err("Failed to get device descriptor: %s.", | |
109 | libusb_error_name(ret)); | |
110 | continue; | |
111 | } | |
112 | ||
113 | if (vid + pid && (des.idVendor != vid || des.idProduct != pid)) | |
114 | continue; | |
115 | ||
116 | b = libusb_get_bus_number(devlist[i]); | |
117 | a = libusb_get_device_address(devlist[i]); | |
118 | if (bus + addr && (b != bus || a != addr)) | |
119 | continue; | |
120 | ||
121 | sr_dbg("Found USB device (VID:PID = %04x:%04x, bus.address = " | |
122 | "%d.%d).", des.idVendor, des.idProduct, b, a); | |
123 | ||
124 | usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]), | |
125 | libusb_get_device_address(devlist[i]), NULL); | |
126 | devices = g_slist_append(devices, usb); | |
127 | } | |
128 | libusb_free_device_list(devlist, 1); | |
129 | ||
130 | sr_dbg("Found %d device(s).", g_slist_length(devices)); | |
131 | ||
132 | return devices; | |
133 | } | |
134 | ||
135 | SR_PRIV int sr_usb_open(libusb_context *usb_ctx, struct sr_usb_dev_inst *usb) | |
136 | { | |
137 | struct libusb_device **devlist; | |
138 | struct libusb_device_descriptor des; | |
139 | int ret, r, cnt, i, a, b; | |
140 | ||
141 | sr_dbg("Trying to open USB device %d.%d.", usb->bus, usb->address); | |
142 | ||
143 | if ((cnt = libusb_get_device_list(usb_ctx, &devlist)) < 0) { | |
144 | sr_err("Failed to retrieve device list: %s.", | |
145 | libusb_error_name(cnt)); | |
146 | return SR_ERR; | |
147 | } | |
148 | ||
149 | ret = SR_ERR; | |
150 | for (i = 0; i < cnt; i++) { | |
151 | if ((r = libusb_get_device_descriptor(devlist[i], &des)) < 0) { | |
152 | sr_err("Failed to get device descriptor: %s.", | |
153 | libusb_error_name(r)); | |
154 | continue; | |
155 | } | |
156 | ||
157 | b = libusb_get_bus_number(devlist[i]); | |
158 | a = libusb_get_device_address(devlist[i]); | |
159 | if (b != usb->bus || a != usb->address) | |
160 | continue; | |
161 | ||
162 | if ((r = libusb_open(devlist[i], &usb->devhdl)) < 0) { | |
163 | sr_err("Failed to open device: %s.", | |
164 | libusb_error_name(r)); | |
165 | break; | |
166 | } | |
167 | ||
168 | sr_dbg("Opened USB device (VID:PID = %04x:%04x, bus.address = " | |
169 | "%d.%d).", des.idVendor, des.idProduct, b, a); | |
170 | ||
171 | ret = SR_OK; | |
172 | break; | |
173 | } | |
174 | ||
175 | libusb_free_device_list(devlist, 1); | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
180 | #ifdef _WIN32 | |
181 | static gpointer usb_thread(gpointer data) | |
182 | { | |
183 | struct sr_context *ctx = data; | |
184 | ||
185 | while (ctx->usb_thread_running) { | |
186 | g_mutex_lock(&ctx->usb_mutex); | |
187 | libusb_wait_for_event(ctx->libusb_ctx, NULL); | |
188 | SetEvent(ctx->usb_event); | |
189 | g_mutex_unlock(&ctx->usb_mutex); | |
190 | g_thread_yield(); | |
191 | } | |
192 | ||
193 | return NULL; | |
194 | } | |
195 | ||
196 | static int usb_callback(int fd, int revents, void *cb_data) | |
197 | { | |
198 | struct sr_context *ctx = cb_data; | |
199 | int ret; | |
200 | ||
201 | g_mutex_lock(&ctx->usb_mutex); | |
202 | ret = ctx->usb_cb(fd, revents, ctx->usb_cb_data); | |
203 | ||
204 | if (ctx->usb_thread_running) { | |
205 | ResetEvent(ctx->usb_event); | |
206 | g_mutex_unlock(&ctx->usb_mutex); | |
207 | } | |
208 | ||
209 | return ret; | |
210 | } | |
211 | #endif | |
212 | ||
213 | SR_PRIV int usb_source_add(struct sr_session *session, struct sr_context *ctx, | |
214 | int timeout, sr_receive_data_callback cb, void *cb_data) | |
215 | { | |
216 | if (ctx->usb_source_present) { | |
217 | sr_err("A USB event source is already present."); | |
218 | return SR_ERR; | |
219 | } | |
220 | ||
221 | #ifdef _WIN32 | |
222 | ctx->usb_event = CreateEvent(NULL, TRUE, FALSE, NULL); | |
223 | g_mutex_init(&ctx->usb_mutex); | |
224 | ctx->usb_thread_running = TRUE; | |
225 | ctx->usb_thread = g_thread_new("usb", usb_thread, ctx); | |
226 | ctx->usb_pollfd.fd = ctx->usb_event; | |
227 | ctx->usb_pollfd.events = G_IO_IN; | |
228 | ctx->usb_cb = cb; | |
229 | ctx->usb_cb_data = cb_data; | |
230 | sr_session_source_add_pollfd(session, &ctx->usb_pollfd, timeout, | |
231 | usb_callback, ctx); | |
232 | #else | |
233 | const struct libusb_pollfd **lupfd; | |
234 | unsigned int i; | |
235 | ||
236 | lupfd = libusb_get_pollfds(ctx->libusb_ctx); | |
237 | for (i = 0; lupfd[i]; i++) | |
238 | sr_session_source_add(session, lupfd[i]->fd, lupfd[i]->events, | |
239 | timeout, cb, cb_data); | |
240 | free(lupfd); | |
241 | #endif | |
242 | ctx->usb_source_present = TRUE; | |
243 | ||
244 | return SR_OK; | |
245 | } | |
246 | ||
247 | SR_PRIV int usb_source_remove(struct sr_session *session, struct sr_context *ctx) | |
248 | { | |
249 | if (!ctx->usb_source_present) | |
250 | return SR_OK; | |
251 | ||
252 | #ifdef _WIN32 | |
253 | ctx->usb_thread_running = FALSE; | |
254 | g_mutex_unlock(&ctx->usb_mutex); | |
255 | libusb_unlock_events(ctx->libusb_ctx); | |
256 | g_thread_join(ctx->usb_thread); | |
257 | g_mutex_clear(&ctx->usb_mutex); | |
258 | sr_session_source_remove_pollfd(session, &ctx->usb_pollfd); | |
259 | CloseHandle(ctx->usb_event); | |
260 | #else | |
261 | const struct libusb_pollfd **lupfd; | |
262 | unsigned int i; | |
263 | ||
264 | lupfd = libusb_get_pollfds(ctx->libusb_ctx); | |
265 | for (i = 0; lupfd[i]; i++) | |
266 | sr_session_source_remove(session, lupfd[i]->fd); | |
267 | free(lupfd); | |
268 | #endif | |
269 | ctx->usb_source_present = FALSE; | |
270 | ||
271 | return SR_OK; | |
272 | } | |
273 | ||
274 | SR_PRIV int usb_get_port_path(libusb_device *dev, char *path, int path_len) | |
275 | { | |
276 | uint8_t port_numbers[8]; | |
277 | int i, n, len; | |
278 | ||
279 | /* | |
280 | * FreeBSD requires that devices prior to calling libusb_get_port_numbers() | |
281 | * have been opened with libusb_open(). | |
282 | */ | |
283 | #ifdef __FreeBSD__ | |
284 | struct libusb_device_handle *devh; | |
285 | if (libusb_open(dev, &devh) != 0) | |
286 | return SR_ERR; | |
287 | #endif | |
288 | n = libusb_get_port_numbers(dev, port_numbers, sizeof(port_numbers)); | |
289 | #ifdef __FreeBSD__ | |
290 | libusb_close(devh); | |
291 | #endif | |
292 | ||
293 | /* Workaround FreeBSD libusb_get_port_numbers() returning 0. */ | |
294 | #ifdef __FreeBSD__ | |
295 | if (n == 0) { | |
296 | port_numbers[0] = libusb_get_device_address(dev); | |
297 | n = 1; | |
298 | } | |
299 | #endif | |
300 | if (n < 1) | |
301 | return SR_ERR; | |
302 | ||
303 | len = snprintf(path, path_len, "usb/%d-%d", | |
304 | libusb_get_bus_number(dev), port_numbers[0]); | |
305 | ||
306 | for (i = 1; i < n; i++) | |
307 | len += snprintf(path+len, path_len-len, ".%d", port_numbers[i]); | |
308 | ||
309 | return SR_OK; | |
310 | } |