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20ed3cee AJ |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org> | |
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 3 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 | ||
6ec6c43b | 20 | #include <config.h> |
20ed3cee | 21 | #include <string.h> |
c1aae900 | 22 | #include <libsigrok/libsigrok.h> |
20ed3cee | 23 | #include "libsigrok-internal.h" |
5a1afc09 | 24 | #include "scpi.h" |
20ed3cee AJ |
25 | |
26 | #define LOG_PREFIX "scpi_usbtmc" | |
27 | ||
28 | #define MAX_TRANSFER_LENGTH 2048 | |
29 | #define TRANSFER_TIMEOUT 1000 | |
30 | ||
31 | struct scpi_usbtmc_libusb { | |
32 | struct sr_context *ctx; | |
33 | struct sr_usb_dev_inst *usb; | |
34 | int detached_kernel_driver; | |
35 | uint8_t interface; | |
36 | uint8_t bulk_in_ep; | |
37 | uint8_t bulk_out_ep; | |
38 | uint8_t interrupt_ep; | |
39 | uint8_t usbtmc_int_cap; | |
40 | uint8_t usbtmc_dev_cap; | |
41 | uint8_t usb488_dev_cap; | |
42 | uint8_t bTag; | |
43 | uint8_t bulkin_attributes; | |
44 | uint8_t buffer[MAX_TRANSFER_LENGTH]; | |
45 | int response_length; | |
46 | int response_bytes_read; | |
47 | int remaining_length; | |
48 | }; | |
49 | ||
50 | /* Some USBTMC-specific enums, as defined in the USBTMC standard. */ | |
51 | #define SUBCLASS_USBTMC 0x03 | |
52 | #define USBTMC_USB488 0x01 | |
53 | ||
54 | enum { | |
55 | /* USBTMC control requests */ | |
56 | INITIATE_ABORT_BULK_OUT = 1, | |
57 | CHECK_ABORT_BULK_OUT_STATUS = 2, | |
58 | INITIATE_ABORT_BULK_IN = 3, | |
59 | CHECK_ABORT_BULK_IN_STATUS = 4, | |
60 | INITIATE_CLEAR = 5, | |
61 | CHECK_CLEAR_STATUS = 6, | |
62 | GET_CAPABILITIES = 7, | |
63 | INDICATOR_PULSE = 64, | |
64 | ||
65 | /* USB488 control requests */ | |
66 | READ_STATUS_BYTE = 128, | |
67 | REN_CONTROL = 160, | |
68 | GO_TO_LOCAL = 161, | |
69 | LOCAL_LOCKOUT = 162, | |
70 | }; | |
71 | ||
baed0211 BV |
72 | /* USBTMC status codes */ |
73 | #define USBTMC_STATUS_SUCCESS 0x01 | |
74 | ||
20ed3cee AJ |
75 | /* USBTMC capabilities */ |
76 | #define USBTMC_INT_CAP_LISTEN_ONLY 0x01 | |
77 | #define USBTMC_INT_CAP_TALK_ONLY 0x02 | |
78 | #define USBTMC_INT_CAP_INDICATOR 0x04 | |
79 | ||
80 | #define USBTMC_DEV_CAP_TERMCHAR 0x01 | |
81 | ||
82 | #define USB488_DEV_CAP_DT1 0x01 | |
83 | #define USB488_DEV_CAP_RL1 0x02 | |
84 | #define USB488_DEV_CAP_SR1 0x04 | |
85 | #define USB488_DEV_CAP_SCPI 0x08 | |
86 | ||
87 | /* Bulk messages constants */ | |
88 | #define USBTMC_BULK_HEADER_SIZE 12 | |
89 | ||
90 | /* Bulk MsgID values */ | |
91 | #define DEV_DEP_MSG_OUT 1 | |
92 | #define REQUEST_DEV_DEP_MSG_IN 2 | |
93 | #define DEV_DEP_MSG_IN 2 | |
94 | ||
95 | /* bmTransferAttributes */ | |
96 | #define EOM 0x01 | |
97 | #define TERM_CHAR_ENABLED 0x02 | |
98 | ||
11582652 BV |
99 | struct usbtmc_blacklist { |
100 | uint16_t vid; | |
101 | uint16_t pid; | |
102 | }; | |
103 | ||
e40e9ca2 | 104 | /* Devices that publish RL1 support, but don't support it. */ |
11582652 | 105 | static struct usbtmc_blacklist blacklist_remote[] = { |
e40e9ca2 AJ |
106 | { 0x1ab1, 0x0588 }, /* Rigol DS1000 series */ |
107 | { 0x1ab1, 0x04b0 }, /* Rigol DS2000 series */ | |
108 | { 0x0957, 0x0588 }, /* Agilent DSO1000 series (rebadged Rigol DS1000) */ | |
a084a8f2 | 109 | { 0x0b21, 0xffff }, /* All Yokogawa devices */ |
11582652 BV |
110 | ALL_ZERO |
111 | }; | |
112 | ||
20ed3cee AJ |
113 | static GSList *scpi_usbtmc_libusb_scan(struct drv_context *drvc) |
114 | { | |
115 | struct libusb_device **devlist; | |
116 | struct libusb_device_descriptor des; | |
117 | struct libusb_config_descriptor *confdes; | |
118 | const struct libusb_interface_descriptor *intfdes; | |
119 | GSList *resources = NULL; | |
120 | int confidx, intfidx, ret, i; | |
121 | char *res; | |
122 | ||
52f6951c UH |
123 | ret = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); |
124 | if (ret < 0) { | |
125 | sr_err("Failed to get device list: %s.", | |
126 | libusb_error_name(ret)); | |
127 | return NULL; | |
128 | } | |
20ed3cee | 129 | for (i = 0; devlist[i]; i++) { |
2a8f2d41 | 130 | libusb_get_device_descriptor(devlist[i], &des); |
20ed3cee AJ |
131 | |
132 | for (confidx = 0; confidx < des.bNumConfigurations; confidx++) { | |
9ad05e6c UH |
133 | if ((ret = libusb_get_config_descriptor(devlist[i], confidx, &confdes)) < 0) { |
134 | sr_dbg("Failed to get configuration descriptor: %s, " | |
135 | "ignoring device.", libusb_error_name(ret)); | |
20ed3cee AJ |
136 | break; |
137 | } | |
138 | for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) { | |
139 | intfdes = confdes->interface[intfidx].altsetting; | |
140 | if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION || | |
141 | intfdes->bInterfaceSubClass != SUBCLASS_USBTMC || | |
142 | intfdes->bInterfaceProtocol != USBTMC_USB488) | |
143 | continue; | |
144 | sr_dbg("Found USBTMC device (VID:PID = %04x:%04x, " | |
145 | "bus.address = %d.%d).", des.idVendor, des.idProduct, | |
146 | libusb_get_bus_number(devlist[i]), | |
147 | libusb_get_device_address(devlist[i])); | |
148 | res = g_strdup_printf("usbtmc/%d.%d", | |
149 | libusb_get_bus_number(devlist[i]), | |
150 | libusb_get_device_address(devlist[i])); | |
151 | resources = g_slist_append(resources, res); | |
152 | } | |
153 | libusb_free_config_descriptor(confdes); | |
154 | } | |
155 | } | |
156 | libusb_free_device_list(devlist, 1); | |
157 | ||
158 | sr_dbg("Found %d device(s).", g_slist_length(resources)); | |
159 | ||
160 | return resources; | |
161 | } | |
162 | ||
163 | static int scpi_usbtmc_libusb_dev_inst_new(void *priv, struct drv_context *drvc, | |
164 | const char *resource, char **params, const char *serialcomm) | |
165 | { | |
166 | struct scpi_usbtmc_libusb *uscpi = priv; | |
167 | GSList *devices; | |
168 | ||
169 | (void)resource; | |
170 | (void)serialcomm; | |
171 | ||
172 | if (!params || !params[1]) { | |
173 | sr_err("Invalid parameters."); | |
174 | return SR_ERR; | |
175 | } | |
176 | ||
177 | uscpi->ctx = drvc->sr_ctx; | |
178 | devices = sr_usb_find(uscpi->ctx->libusb_ctx, params[1]); | |
179 | if (g_slist_length(devices) != 1) { | |
180 | sr_err("Failed to find USB device '%s'.", params[1]); | |
181 | g_slist_free_full(devices, (GDestroyNotify)sr_usb_dev_inst_free); | |
182 | return SR_ERR; | |
183 | } | |
184 | uscpi->usb = devices->data; | |
185 | g_slist_free(devices); | |
186 | ||
187 | return SR_OK; | |
188 | } | |
189 | ||
11582652 BV |
190 | static int check_usbtmc_blacklist(struct usbtmc_blacklist *blacklist, |
191 | uint16_t vid, uint16_t pid) | |
192 | { | |
193 | int i; | |
194 | ||
195 | for (i = 0; blacklist[i].vid; i++) { | |
a084a8f2 SA |
196 | if ((blacklist[i].vid == vid && blacklist[i].pid == 0xFFFF) || |
197 | (blacklist[i].vid == vid && blacklist[i].pid == pid)) | |
11582652 BV |
198 | return TRUE; |
199 | } | |
200 | ||
201 | return FALSE; | |
202 | } | |
203 | ||
204 | static int scpi_usbtmc_remote(struct scpi_usbtmc_libusb *uscpi) | |
205 | { | |
206 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
207 | struct libusb_device *dev; | |
208 | struct libusb_device_descriptor des; | |
209 | int ret; | |
210 | uint8_t status; | |
211 | ||
212 | if (!(uscpi->usb488_dev_cap & USB488_DEV_CAP_RL1)) | |
213 | return SR_OK; | |
214 | ||
215 | dev = libusb_get_device(usb->devhdl); | |
216 | libusb_get_device_descriptor(dev, &des); | |
217 | if (check_usbtmc_blacklist(blacklist_remote, des.idVendor, des.idProduct)) | |
218 | return SR_OK; | |
219 | ||
220 | sr_dbg("Locking out local control."); | |
221 | ret = libusb_control_transfer(usb->devhdl, | |
222 | LIBUSB_ENDPOINT_IN | | |
223 | LIBUSB_REQUEST_TYPE_CLASS | | |
224 | LIBUSB_RECIPIENT_INTERFACE, | |
225 | REN_CONTROL, 1, | |
226 | uscpi->interface, | |
227 | &status, 1, | |
228 | TRANSFER_TIMEOUT); | |
229 | if (ret < 0 || status != USBTMC_STATUS_SUCCESS) { | |
230 | if (ret < 0) | |
231 | sr_dbg("Failed to enter REN state: %s.", libusb_error_name(ret)); | |
232 | else | |
233 | sr_dbg("Failed to enter REN state: USBTMC status %d.", status); | |
234 | return SR_ERR; | |
235 | } | |
236 | ||
237 | ret = libusb_control_transfer(usb->devhdl, | |
238 | LIBUSB_ENDPOINT_IN | | |
239 | LIBUSB_REQUEST_TYPE_CLASS | | |
240 | LIBUSB_RECIPIENT_INTERFACE, | |
241 | LOCAL_LOCKOUT, 1, | |
242 | uscpi->interface, | |
243 | &status, 1, | |
244 | TRANSFER_TIMEOUT); | |
245 | if (ret < 0 || status != USBTMC_STATUS_SUCCESS) { | |
246 | if (ret < 0) | |
247 | sr_dbg("Failed to enter local lockout state: %s.", | |
248 | libusb_error_name(ret)); | |
249 | else | |
250 | sr_dbg("Failed to enter local lockout state: USBTMC " | |
251 | "status %d.", status); | |
252 | return SR_ERR; | |
253 | } | |
254 | ||
255 | return SR_OK; | |
256 | } | |
257 | ||
258 | static void scpi_usbtmc_local(struct scpi_usbtmc_libusb *uscpi) | |
259 | { | |
260 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
261 | struct libusb_device *dev; | |
262 | struct libusb_device_descriptor des; | |
263 | int ret; | |
264 | uint8_t status; | |
265 | ||
266 | if (!(uscpi->usb488_dev_cap & USB488_DEV_CAP_RL1)) | |
267 | return; | |
268 | ||
269 | dev = libusb_get_device(usb->devhdl); | |
270 | libusb_get_device_descriptor(dev, &des); | |
271 | if (check_usbtmc_blacklist(blacklist_remote, des.idVendor, des.idProduct)) | |
272 | return; | |
273 | ||
274 | sr_dbg("Returning local control."); | |
275 | ret = libusb_control_transfer(usb->devhdl, | |
276 | LIBUSB_ENDPOINT_IN | | |
277 | LIBUSB_REQUEST_TYPE_CLASS | | |
278 | LIBUSB_RECIPIENT_INTERFACE, | |
279 | GO_TO_LOCAL, 1, | |
280 | uscpi->interface, | |
281 | &status, 1, | |
282 | TRANSFER_TIMEOUT); | |
283 | if (ret < 0 || status != USBTMC_STATUS_SUCCESS) { | |
284 | if (ret < 0) | |
285 | sr_dbg("Failed to clear local lockout state: %s.", | |
286 | libusb_error_name(ret)); | |
287 | else | |
288 | sr_dbg("Failed to clear local lockout state: USBTMC " | |
289 | "status %d.", status); | |
290 | } | |
291 | ||
292 | return; | |
293 | } | |
294 | ||
04229f7b | 295 | static int scpi_usbtmc_libusb_open(struct sr_scpi_dev_inst *scpi) |
20ed3cee | 296 | { |
04229f7b | 297 | struct scpi_usbtmc_libusb *uscpi = scpi->priv; |
20ed3cee AJ |
298 | struct sr_usb_dev_inst *usb = uscpi->usb; |
299 | struct libusb_device *dev; | |
300 | struct libusb_device_descriptor des; | |
301 | struct libusb_config_descriptor *confdes; | |
302 | const struct libusb_interface_descriptor *intfdes; | |
303 | const struct libusb_endpoint_descriptor *ep; | |
938bdc25 | 304 | int confidx, intfidx, epidx, config = 0, current_config; |
11582652 | 305 | uint8_t capabilities[24]; |
20ed3cee AJ |
306 | int ret, found = 0; |
307 | ||
308 | if (usb->devhdl) | |
309 | return SR_OK; | |
310 | ||
311 | if (sr_usb_open(uscpi->ctx->libusb_ctx, usb) != SR_OK) | |
312 | return SR_ERR; | |
313 | ||
314 | dev = libusb_get_device(usb->devhdl); | |
2a8f2d41 | 315 | libusb_get_device_descriptor(dev, &des); |
20ed3cee AJ |
316 | |
317 | for (confidx = 0; confidx < des.bNumConfigurations; confidx++) { | |
9ad05e6c UH |
318 | if ((ret = libusb_get_config_descriptor(dev, confidx, &confdes)) < 0) { |
319 | sr_dbg("Failed to get configuration descriptor: %s, " | |
320 | "ignoring device.", libusb_error_name(ret)); | |
20ed3cee AJ |
321 | continue; |
322 | } | |
323 | for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) { | |
324 | intfdes = confdes->interface[intfidx].altsetting; | |
325 | if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION || | |
326 | intfdes->bInterfaceSubClass != SUBCLASS_USBTMC || | |
327 | intfdes->bInterfaceProtocol != USBTMC_USB488) | |
328 | continue; | |
329 | uscpi->interface = intfdes->bInterfaceNumber; | |
20ed3cee | 330 | config = confdes->bConfigurationValue; |
e82d34a9 | 331 | sr_dbg("Interface %d configuration %d.", uscpi->interface, config); |
20ed3cee AJ |
332 | for (epidx = 0; epidx < intfdes->bNumEndpoints; epidx++) { |
333 | ep = &intfdes->endpoint[epidx]; | |
334 | if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_BULK && | |
335 | !(ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK))) { | |
336 | uscpi->bulk_out_ep = ep->bEndpointAddress; | |
337 | sr_dbg("Bulk OUT EP %d", uscpi->bulk_out_ep); | |
338 | } | |
339 | if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_BULK && | |
340 | ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK)) { | |
341 | uscpi->bulk_in_ep = ep->bEndpointAddress; | |
e82d34a9 | 342 | sr_dbg("Bulk IN EP %d", uscpi->bulk_in_ep & 0x7f); |
20ed3cee AJ |
343 | } |
344 | if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_INTERRUPT && | |
345 | ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK)) { | |
346 | uscpi->interrupt_ep = ep->bEndpointAddress; | |
e82d34a9 | 347 | sr_dbg("Interrupt EP %d", uscpi->interrupt_ep & 0x7f); |
20ed3cee AJ |
348 | } |
349 | } | |
350 | found = 1; | |
351 | } | |
352 | libusb_free_config_descriptor(confdes); | |
353 | if (found) | |
354 | break; | |
355 | } | |
356 | ||
357 | if (!found) { | |
52f6951c | 358 | sr_err("Failed to find USBTMC interface."); |
20ed3cee AJ |
359 | return SR_ERR; |
360 | } | |
361 | ||
362 | if (libusb_kernel_driver_active(usb->devhdl, uscpi->interface) == 1) { | |
363 | if ((ret = libusb_detach_kernel_driver(usb->devhdl, | |
364 | uscpi->interface)) < 0) { | |
52f6951c UH |
365 | sr_err("Failed to detach kernel driver: %s.", |
366 | libusb_error_name(ret)); | |
20ed3cee AJ |
367 | return SR_ERR; |
368 | } | |
369 | uscpi->detached_kernel_driver = 1; | |
370 | } | |
371 | ||
938bdc25 AJ |
372 | if (libusb_get_configuration(usb->devhdl, ¤t_config) == 0 |
373 | && current_config != config) { | |
374 | if ((ret = libusb_set_configuration(usb->devhdl, config)) < 0) { | |
375 | sr_err("Failed to set configuration: %s.", | |
376 | libusb_error_name(ret)); | |
377 | return SR_ERR; | |
378 | } | |
20ed3cee AJ |
379 | } |
380 | ||
d8cbd659 | 381 | if ((ret = libusb_claim_interface(usb->devhdl, uscpi->interface)) < 0) { |
52f6951c UH |
382 | sr_err("Failed to claim interface: %s.", |
383 | libusb_error_name(ret)); | |
20ed3cee AJ |
384 | return SR_ERR; |
385 | } | |
386 | ||
52f6951c | 387 | /* Get capabilities. */ |
20ed3cee AJ |
388 | ret = libusb_control_transfer(usb->devhdl, |
389 | LIBUSB_ENDPOINT_IN | | |
390 | LIBUSB_REQUEST_TYPE_CLASS | | |
391 | LIBUSB_RECIPIENT_INTERFACE, | |
392 | GET_CAPABILITIES, 0, | |
393 | uscpi->interface, | |
394 | capabilities, sizeof(capabilities), | |
395 | TRANSFER_TIMEOUT); | |
396 | if (ret == sizeof(capabilities)) { | |
397 | uscpi->usbtmc_int_cap = capabilities[ 4]; | |
398 | uscpi->usbtmc_dev_cap = capabilities[ 5]; | |
399 | uscpi->usb488_dev_cap = capabilities[15]; | |
400 | } | |
52f6951c | 401 | sr_dbg("Device capabilities: %s%s%s%s%s, %s, %s", |
20ed3cee AJ |
402 | uscpi->usb488_dev_cap & USB488_DEV_CAP_SCPI ? "SCPI, " : "", |
403 | uscpi->usbtmc_dev_cap & USBTMC_DEV_CAP_TERMCHAR ? "TermChar, ": "", | |
404 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_LISTEN_ONLY? "L3, " : | |
405 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_TALK_ONLY ? "" : "L4, ", | |
406 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_TALK_ONLY ? "T5, " : | |
407 | uscpi->usbtmc_int_cap & USBTMC_INT_CAP_LISTEN_ONLY? "" : "T6, ", | |
408 | uscpi->usb488_dev_cap & USB488_DEV_CAP_SR1 ? "SR1" : "SR0", | |
409 | uscpi->usb488_dev_cap & USB488_DEV_CAP_RL1 ? "RL1" : "RL0", | |
410 | uscpi->usb488_dev_cap & USB488_DEV_CAP_DT1 ? "DT1" : "DT0"); | |
411 | ||
11582652 | 412 | scpi_usbtmc_remote(uscpi); |
baed0211 | 413 | |
20ed3cee AJ |
414 | return SR_OK; |
415 | } | |
416 | ||
102f1239 BV |
417 | static int scpi_usbtmc_libusb_source_add(struct sr_session *session, |
418 | void *priv, int events, int timeout, sr_receive_data_callback cb, | |
419 | void *cb_data) | |
20ed3cee AJ |
420 | { |
421 | struct scpi_usbtmc_libusb *uscpi = priv; | |
422 | (void)events; | |
102f1239 | 423 | return usb_source_add(session, uscpi->ctx, timeout, cb, cb_data); |
20ed3cee AJ |
424 | } |
425 | ||
102f1239 BV |
426 | static int scpi_usbtmc_libusb_source_remove(struct sr_session *session, |
427 | void *priv) | |
20ed3cee AJ |
428 | { |
429 | struct scpi_usbtmc_libusb *uscpi = priv; | |
102f1239 | 430 | return usb_source_remove(session, uscpi->ctx); |
20ed3cee AJ |
431 | } |
432 | ||
433 | static void usbtmc_bulk_out_header_write(void *header, uint8_t MsgID, | |
434 | uint8_t bTag, | |
435 | uint32_t TransferSize, | |
436 | uint8_t bmTransferAttributes, | |
437 | char TermChar) | |
438 | { | |
439 | W8(header+ 0, MsgID); | |
440 | W8(header+ 1, bTag); | |
441 | W8(header+ 2, ~bTag); | |
442 | W8(header+ 3, 0); | |
443 | WL32(header+ 4, TransferSize); | |
444 | W8(header+ 8, bmTransferAttributes); | |
445 | W8(header+ 9, TermChar); | |
446 | WL16(header+10, 0); | |
447 | } | |
448 | ||
449 | static int usbtmc_bulk_in_header_read(void *header, uint8_t MsgID, | |
450 | unsigned char bTag, | |
451 | int32_t *TransferSize, | |
452 | uint8_t *bmTransferAttributes) | |
453 | { | |
454 | if (R8(header+0) != MsgID || | |
455 | R8(header+1) != bTag || | |
456 | R8(header+2) != (unsigned char)~bTag) | |
457 | return SR_ERR; | |
458 | if (TransferSize) | |
459 | *TransferSize = RL32(header+4); | |
460 | if (bmTransferAttributes) | |
461 | *bmTransferAttributes = R8(header+8); | |
462 | return SR_OK; | |
463 | } | |
464 | ||
465 | static int scpi_usbtmc_bulkout(struct scpi_usbtmc_libusb *uscpi, | |
466 | uint8_t msg_id, const void *data, int32_t size, | |
467 | uint8_t transfer_attributes) | |
468 | { | |
469 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
470 | int padded_size, ret, transferred; | |
471 | ||
472 | if (data && size+USBTMC_BULK_HEADER_SIZE+3 > (int)sizeof(uscpi->buffer)) { | |
52f6951c | 473 | sr_err("USBTMC bulk out transfer is too big."); |
20ed3cee AJ |
474 | return SR_ERR; |
475 | } | |
476 | ||
477 | uscpi->bTag++; | |
52f6951c | 478 | uscpi->bTag += !uscpi->bTag; /* bTag == 0 is invalid so avoid it. */ |
20ed3cee AJ |
479 | |
480 | usbtmc_bulk_out_header_write(uscpi->buffer, msg_id, uscpi->bTag, | |
481 | size, transfer_attributes, 0); | |
482 | if (data) | |
483 | memcpy(uscpi->buffer+USBTMC_BULK_HEADER_SIZE, data, size); | |
484 | else | |
485 | size = 0; | |
486 | size += USBTMC_BULK_HEADER_SIZE; | |
487 | padded_size = (size + 3) & ~0x3; | |
488 | memset(uscpi->buffer+size, 0, padded_size - size); | |
489 | ||
490 | ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_out_ep, | |
491 | uscpi->buffer, padded_size, &transferred, | |
492 | TRANSFER_TIMEOUT); | |
d8cbd659 | 493 | if (ret < 0) { |
52f6951c UH |
494 | sr_err("USBTMC bulk out transfer error: %s.", |
495 | libusb_error_name(ret)); | |
20ed3cee AJ |
496 | return SR_ERR; |
497 | } | |
498 | ||
499 | if (transferred < padded_size) { | |
52f6951c | 500 | sr_dbg("USBTMC bulk out partial transfer (%d/%d bytes).", |
20ed3cee AJ |
501 | transferred, padded_size); |
502 | return SR_ERR; | |
503 | } | |
504 | ||
505 | return transferred - USBTMC_BULK_HEADER_SIZE; | |
506 | } | |
507 | ||
508 | static int scpi_usbtmc_bulkin_start(struct scpi_usbtmc_libusb *uscpi, | |
509 | uint8_t msg_id, void *data, int32_t size, | |
510 | uint8_t *transfer_attributes) | |
511 | { | |
512 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
513 | int ret, transferred, message_size; | |
514 | ||
515 | ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_in_ep, data, size, | |
516 | &transferred, TRANSFER_TIMEOUT); | |
d8cbd659 | 517 | if (ret < 0) { |
52f6951c UH |
518 | sr_err("USBTMC bulk in transfer error: %s.", |
519 | libusb_error_name(ret)); | |
20ed3cee AJ |
520 | return SR_ERR; |
521 | } | |
522 | ||
523 | if (usbtmc_bulk_in_header_read(data, msg_id, uscpi->bTag, &message_size, | |
524 | transfer_attributes) != SR_OK) { | |
52f6951c | 525 | sr_err("USBTMC invalid bulk in header."); |
20ed3cee AJ |
526 | return SR_ERR; |
527 | } | |
528 | ||
529 | message_size += USBTMC_BULK_HEADER_SIZE; | |
530 | uscpi->response_length = MIN(transferred, message_size); | |
531 | uscpi->response_bytes_read = USBTMC_BULK_HEADER_SIZE; | |
532 | uscpi->remaining_length = message_size - uscpi->response_length; | |
533 | ||
534 | return transferred - USBTMC_BULK_HEADER_SIZE; | |
535 | } | |
536 | ||
537 | static int scpi_usbtmc_bulkin_continue(struct scpi_usbtmc_libusb *uscpi, | |
538 | void *data, int size) | |
539 | { | |
540 | struct sr_usb_dev_inst *usb = uscpi->usb; | |
541 | int ret, transferred; | |
542 | ||
543 | ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_in_ep, data, size, | |
544 | &transferred, TRANSFER_TIMEOUT); | |
d8cbd659 | 545 | if (ret < 0) { |
52f6951c UH |
546 | sr_err("USBTMC bulk in transfer error: %s.", |
547 | libusb_error_name(ret)); | |
20ed3cee AJ |
548 | return SR_ERR; |
549 | } | |
550 | ||
551 | uscpi->response_length = MIN(transferred, uscpi->remaining_length); | |
552 | uscpi->response_bytes_read = 0; | |
553 | uscpi->remaining_length -= uscpi->response_length; | |
554 | ||
555 | return transferred; | |
556 | } | |
557 | ||
558 | static int scpi_usbtmc_libusb_send(void *priv, const char *command) | |
559 | { | |
560 | struct scpi_usbtmc_libusb *uscpi = priv; | |
561 | ||
562 | if (scpi_usbtmc_bulkout(uscpi, DEV_DEP_MSG_OUT, | |
563 | command, strlen(command), EOM) <= 0) | |
564 | return SR_ERR; | |
565 | ||
566 | sr_spew("Successfully sent SCPI command: '%s'.", command); | |
567 | ||
568 | return SR_OK; | |
569 | } | |
570 | ||
571 | static int scpi_usbtmc_libusb_read_begin(void *priv) | |
572 | { | |
573 | struct scpi_usbtmc_libusb *uscpi = priv; | |
574 | ||
575 | uscpi->remaining_length = 0; | |
576 | ||
577 | if (scpi_usbtmc_bulkout(uscpi, REQUEST_DEV_DEP_MSG_IN, | |
578 | NULL, INT32_MAX, 0) < 0) | |
579 | return SR_ERR; | |
580 | if (scpi_usbtmc_bulkin_start(uscpi, DEV_DEP_MSG_IN, | |
581 | uscpi->buffer, sizeof(uscpi->buffer), | |
582 | &uscpi->bulkin_attributes) < 0) | |
583 | return SR_ERR; | |
584 | ||
585 | return SR_OK; | |
586 | } | |
587 | ||
588 | static int scpi_usbtmc_libusb_read_data(void *priv, char *buf, int maxlen) | |
589 | { | |
590 | struct scpi_usbtmc_libusb *uscpi = priv; | |
591 | int read_length; | |
592 | ||
593 | if (uscpi->response_bytes_read >= uscpi->response_length) { | |
594 | if (uscpi->remaining_length > 0) { | |
595 | if (scpi_usbtmc_bulkin_continue(uscpi, uscpi->buffer, | |
596 | sizeof(uscpi->buffer)) <= 0) | |
597 | return SR_ERR; | |
598 | } else { | |
599 | if (uscpi->bulkin_attributes & EOM) | |
600 | return SR_ERR; | |
601 | if (scpi_usbtmc_libusb_read_begin(uscpi) < 0) | |
602 | return SR_ERR; | |
603 | } | |
604 | } | |
605 | ||
606 | read_length = MIN(uscpi->response_length - uscpi->response_bytes_read, maxlen); | |
607 | ||
608 | memcpy(buf, uscpi->buffer + uscpi->response_bytes_read, read_length); | |
609 | ||
610 | uscpi->response_bytes_read += read_length; | |
611 | ||
612 | return read_length; | |
613 | } | |
614 | ||
615 | static int scpi_usbtmc_libusb_read_complete(void *priv) | |
616 | { | |
617 | struct scpi_usbtmc_libusb *uscpi = priv; | |
618 | return uscpi->response_bytes_read >= uscpi->response_length && | |
619 | uscpi->remaining_length <= 0 && | |
620 | uscpi->bulkin_attributes & EOM; | |
621 | } | |
622 | ||
04229f7b | 623 | static int scpi_usbtmc_libusb_close(struct sr_scpi_dev_inst *scpi) |
20ed3cee | 624 | { |
04229f7b | 625 | struct scpi_usbtmc_libusb *uscpi = scpi->priv; |
20ed3cee | 626 | struct sr_usb_dev_inst *usb = uscpi->usb; |
04229f7b | 627 | int ret; |
20ed3cee AJ |
628 | |
629 | if (!usb->devhdl) | |
630 | return SR_ERR; | |
631 | ||
11582652 | 632 | scpi_usbtmc_local(uscpi); |
baed0211 | 633 | |
52f6951c UH |
634 | if ((ret = libusb_release_interface(usb->devhdl, uscpi->interface)) < 0) |
635 | sr_err("Failed to release interface: %s.", | |
636 | libusb_error_name(ret)); | |
637 | ||
20ed3cee | 638 | if (uscpi->detached_kernel_driver) { |
52f6951c UH |
639 | if ((ret = libusb_attach_kernel_driver(usb->devhdl, |
640 | uscpi->interface)) < 0) | |
641 | sr_err("Failed to re-attach kernel driver: %s.", | |
642 | libusb_error_name(ret)); | |
643 | ||
20ed3cee AJ |
644 | uscpi->detached_kernel_driver = 0; |
645 | } | |
0b2b92f6 | 646 | sr_usb_close(usb); |
20ed3cee AJ |
647 | |
648 | return SR_OK; | |
649 | } | |
650 | ||
651 | static void scpi_usbtmc_libusb_free(void *priv) | |
652 | { | |
653 | struct scpi_usbtmc_libusb *uscpi = priv; | |
654 | sr_usb_dev_inst_free(uscpi->usb); | |
655 | } | |
656 | ||
20ed3cee AJ |
657 | SR_PRIV const struct sr_scpi_dev_inst scpi_usbtmc_libusb_dev = { |
658 | .name = "USBTMC", | |
659 | .prefix = "usbtmc", | |
660 | .priv_size = sizeof(struct scpi_usbtmc_libusb), | |
661 | .scan = scpi_usbtmc_libusb_scan, | |
662 | .dev_inst_new = scpi_usbtmc_libusb_dev_inst_new, | |
663 | .open = scpi_usbtmc_libusb_open, | |
664 | .source_add = scpi_usbtmc_libusb_source_add, | |
665 | .source_remove = scpi_usbtmc_libusb_source_remove, | |
666 | .send = scpi_usbtmc_libusb_send, | |
667 | .read_begin = scpi_usbtmc_libusb_read_begin, | |
668 | .read_data = scpi_usbtmc_libusb_read_data, | |
669 | .read_complete = scpi_usbtmc_libusb_read_complete, | |
670 | .close = scpi_usbtmc_libusb_close, | |
671 | .free = scpi_usbtmc_libusb_free, | |
672 | }; |