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4417074c GS |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2017-2019 Gerhard Sittig <gerhard.sittig@gmx.net> | |
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 | ||
20 | #include "config.h" | |
edec0436 GS |
21 | #include <glib.h> |
22 | #ifdef HAVE_LIBHIDAPI | |
23 | #include <hidapi.h> | |
24 | #endif | |
4417074c GS |
25 | #include <libsigrok/libsigrok.h> |
26 | #include "libsigrok-internal.h" | |
edec0436 GS |
27 | #include "serial_hid.h" |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #ifdef G_OS_WIN32 | |
31 | #include <windows.h> /* for HANDLE */ | |
32 | #endif | |
4417074c GS |
33 | |
34 | /** @cond PRIVATE */ | |
35 | #define LOG_PREFIX "serial-hid" | |
36 | /** @endcond */ | |
37 | ||
edec0436 GS |
38 | #ifdef HAVE_SERIAL_COMM |
39 | ||
40 | /** | |
41 | * @file | |
42 | * | |
43 | * Serial port handling, HIDAPI library specific support code. | |
44 | */ | |
45 | ||
46 | /** | |
47 | * @defgroup grp_serial_hid Serial port handling, HID group | |
48 | * | |
49 | * Make serial-over-HID communication appear like a regular serial port. | |
50 | * | |
51 | * @{ | |
52 | */ | |
53 | ||
54 | #ifdef HAVE_LIBHIDAPI | |
55 | /* {{{ helper routines */ | |
56 | ||
57 | /* Strip off parity bits for "odd" data bit counts like in 7e1 frames. */ | |
58 | static void ser_hid_mask_databits(struct sr_serial_dev_inst *serial, | |
59 | uint8_t *data, size_t len) | |
60 | { | |
61 | uint32_t mask32; | |
62 | uint8_t mask; | |
63 | size_t idx; | |
64 | ||
65 | if ((serial->comm_params.data_bits % 8) == 0) | |
66 | return; | |
67 | ||
68 | mask32 = (1UL << serial->comm_params.data_bits) - 1; | |
69 | mask = mask32 & 0xff; | |
70 | for (idx = 0; idx < len; idx++) | |
71 | data[idx] &= mask; | |
72 | } | |
73 | ||
74 | /* }}} */ | |
75 | /* {{{ open/close/list/find HIDAPI connection, exchange HID requests and data */ | |
76 | ||
77 | /* | |
78 | * Convert a HIDAPI path (which depends on the target platform, and may | |
79 | * depend on one of several available API variants on that platform) to | |
80 | * something that is usable as a "port name" in conn= specs. | |
81 | * | |
82 | * Since conn= is passed with -d where multiple options (among them conn=) | |
83 | * are separated by colons, port names themselves cannot contain colons. | |
84 | * | |
85 | * Just replace colons by a period in the simple case (Linux platform, | |
86 | * hidapi-libusb implementation, bus/address/interface). Prefix the | |
87 | * HIDAPI path in the complex cases (Linux hidapi-hidraw, Windows, Mac). | |
88 | * Paths with colons outside of libusb based implementations are unhandled | |
89 | * here, but were not yet seen on any sigrok supported platform either. | |
90 | * So just reject them. | |
91 | */ | |
92 | static char *get_hidapi_path_copy(const char *path) | |
93 | { | |
94 | static const char *accept = "0123456789abcdefABCDEF:"; | |
95 | static const char *keep = "0123456789abcdefABCDEF"; | |
96 | ||
97 | int has_colon; | |
98 | int is_hex_colon; | |
99 | char *name; | |
100 | ||
101 | has_colon = strchr(path, ':') != NULL; | |
102 | is_hex_colon = strspn(path, accept) == strlen(path); | |
103 | if (has_colon && !is_hex_colon) { | |
104 | sr_err("Unsupported HIDAPI path format: %s", path); | |
105 | return NULL; | |
106 | } | |
107 | if (is_hex_colon) { | |
108 | name = g_strdup_printf("%s%s", SER_HID_USB_PREFIX, path); | |
109 | g_strcanon(name + strlen(SER_HID_USB_PREFIX), keep, '.'); | |
110 | } else { | |
111 | name = g_strdup_printf("%s%s", SER_HID_RAW_PREFIX, path); | |
112 | } | |
113 | ||
114 | return name; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Undo the port name construction that was done during scan. Extract | |
119 | * the HIDAPI path from a conn= input spec (the part after the hid/ | |
120 | * prefix and chip type). | |
121 | * | |
122 | * Strip off the "raw" prefix, or undo colon substitution. See @ref | |
123 | * get_hidapi_path_copy() for details. | |
124 | */ | |
125 | static const char *extract_hidapi_path(char *buffer) | |
126 | { | |
127 | static const char *keep = "0123456789abcdefABCDEF:"; | |
128 | ||
129 | const char *p; | |
130 | ||
131 | p = buffer; | |
132 | if (!p || !*p) | |
133 | return NULL; | |
134 | ||
135 | if (strncmp(p, SER_HID_RAW_PREFIX, strlen(SER_HID_RAW_PREFIX)) == 0) { | |
136 | p += strlen(SER_HID_RAW_PREFIX); | |
137 | return p; | |
138 | } | |
139 | if (strncmp(p, SER_HID_USB_PREFIX, strlen(SER_HID_USB_PREFIX)) == 0) { | |
140 | p += strlen(SER_HID_USB_PREFIX); | |
141 | g_strcanon(buffer, keep, ':'); | |
142 | return p; | |
143 | } | |
144 | ||
145 | return NULL; | |
146 | } | |
147 | ||
148 | /* | |
149 | * The HIDAPI specific list() callback, invoked by common serial.c code. | |
150 | * Enumerate all devices (no VID:PID is involved). | |
151 | * Invoke an 'append' callback with "path" and "name". | |
152 | */ | |
153 | static GSList *ser_hid_hidapi_list(GSList *list, sr_ser_list_append_t append) | |
154 | { | |
155 | struct hid_device_info *devs, *curdev; | |
156 | const char *chipname; | |
157 | char *path, *name; | |
158 | wchar_t *manuf, *prod, *serno; | |
159 | uint16_t vid, pid; | |
160 | GString *desc; | |
161 | ||
162 | devs = hid_enumerate(0x0000, 0x0000); | |
163 | for (curdev = devs; curdev; curdev = curdev->next) { | |
164 | /* | |
165 | * Determine the chip name from VID:PID (if it's one of | |
166 | * the supported types with an ID known to us). | |
167 | */ | |
168 | vid = curdev->vendor_id; | |
169 | pid = curdev->product_id; | |
edec0436 GS |
170 | chipname = ser_hid_chip_find_name_vid_pid(vid, pid); |
171 | if (!chipname) | |
172 | chipname = "<chip>"; | |
173 | ||
174 | /* | |
175 | * Prefix port names such that open() calls with this | |
176 | * conn= spec will end up here and contain all details | |
177 | * that are essential for processing. | |
178 | */ | |
179 | path = get_hidapi_path_copy(curdev->path); | |
180 | if (!path) | |
181 | continue; | |
182 | name = g_strdup_printf("%s/%s/%s", | |
183 | SER_HID_CONN_PREFIX, chipname, path); | |
184 | g_free(path); | |
185 | ||
186 | /* | |
187 | * Print whatever information was available. Construct | |
188 | * the description text from pieces. Absence of fields | |
189 | * is not fatal, we have seen perfectly usable cables | |
190 | * that only had a VID and PID (permissions were not an | |
191 | * issue). | |
192 | */ | |
193 | manuf = curdev->manufacturer_string; | |
194 | prod = curdev->product_string; | |
195 | serno = curdev->serial_number; | |
196 | vid = curdev->vendor_id; | |
197 | pid = curdev->product_id; | |
198 | desc = g_string_sized_new(128); | |
199 | g_string_append_printf(desc, "HID"); | |
be7c63dc | 200 | if (manuf && wcslen(manuf) != 0) |
edec0436 | 201 | g_string_append_printf(desc, " %ls", manuf); |
be7c63dc | 202 | if (prod && wcslen(prod) != 0) |
edec0436 | 203 | g_string_append_printf(desc, " %ls", prod); |
be7c63dc | 204 | if (serno && wcslen(serno) != 0) |
edec0436 GS |
205 | g_string_append_printf(desc, " %ls", serno); |
206 | if (vid && pid) | |
be7c63dc | 207 | g_string_append_printf(desc, " [%04hx.%04hx]", vid, pid); |
edec0436 GS |
208 | list = append(list, name, desc->str); |
209 | g_string_free(desc, TRUE); | |
210 | g_free(name); | |
211 | } | |
212 | hid_free_enumeration(devs); | |
213 | ||
214 | return list; | |
215 | } | |
216 | ||
217 | /* | |
218 | * The HIDAPI specific find_usb() callback, invoked by common serial.c code. | |
219 | * Enumerate devices for the specified VID:PID pair. | |
220 | * Invoke an "append" callback with 'path' for the device. | |
221 | */ | |
222 | static GSList *ser_hid_hidapi_find_usb(GSList *list, sr_ser_find_append_t append, | |
223 | uint16_t vendor_id, uint16_t product_id) | |
224 | { | |
225 | struct hid_device_info *devs, *curdev; | |
226 | const char *name; | |
227 | ||
228 | devs = hid_enumerate(vendor_id, product_id); | |
229 | for (curdev = devs; curdev; curdev = curdev->next) { | |
230 | name = curdev->path; | |
231 | list = append(list, name); | |
232 | } | |
233 | hid_free_enumeration(devs); | |
234 | ||
235 | return list; | |
236 | } | |
237 | ||
238 | /* Get the serial number of a device specified by path. */ | |
239 | static int ser_hid_hidapi_get_serno(const char *path, char *buf, size_t blen) | |
240 | { | |
241 | char *usbpath; | |
242 | const char *hidpath; | |
243 | hid_device *dev; | |
244 | wchar_t *serno_wch; | |
245 | int rc; | |
246 | ||
247 | if (!path || !*path) | |
248 | return SR_ERR_ARG; | |
249 | usbpath = g_strdup(path); | |
250 | hidpath = extract_hidapi_path(usbpath); | |
251 | dev = hidpath ? hid_open_path(hidpath) : NULL; | |
252 | g_free(usbpath); | |
253 | if (!dev) | |
254 | return SR_ERR_IO; | |
255 | ||
256 | serno_wch = g_malloc0(blen * sizeof(*serno_wch)); | |
257 | rc = hid_get_serial_number_string(dev, serno_wch, blen - 1); | |
258 | hid_close(dev); | |
259 | if (rc != 0) { | |
260 | g_free(serno_wch); | |
261 | return SR_ERR_IO; | |
262 | } | |
263 | ||
264 | snprintf(buf, blen, "%ls", serno_wch); | |
265 | g_free(serno_wch); | |
266 | ||
267 | return SR_OK; | |
268 | } | |
269 | ||
270 | /* Get the VID and PID of a device specified by path. */ | |
271 | static int ser_hid_hidapi_get_vid_pid(const char *path, | |
272 | uint16_t *vid, uint16_t *pid) | |
273 | { | |
274 | #if 0 | |
275 | /* | |
276 | * Bummer! It would have been most reliable to just open the | |
277 | * device by the specified path, and grab its VID:PID. But | |
278 | * there is no way to get these parameters, neither in the | |
279 | * HIDAPI itself, nor when cheating and reaching behind the API | |
280 | * and accessing the libusb handle in dirty ways. :( | |
281 | */ | |
282 | hid_device *dev; | |
283 | ||
284 | if (!path || !*path) | |
285 | return SR_ERR_ARG; | |
286 | dev = hid_open_path(path); | |
287 | if (!dev) | |
288 | return SR_ERR_IO; | |
289 | if (vid) | |
290 | *vid = dev->vendor_id; | |
291 | if (pid) | |
292 | *pid = dev->product_id; | |
293 | hid_close(dev); | |
294 | ||
295 | return SR_OK; | |
296 | #else | |
297 | /* | |
298 | * The fallback approach. Enumerate all devices, compare the | |
299 | * enumerated USB path, and grab the VID:PID. Unfortunately the | |
300 | * caller can provide path specs that differ from enumerated | |
301 | * paths yet mean the same (address the same device). This needs | |
302 | * more attention. Though the specific format of the path and | |
303 | * its meaning are said to be OS specific, which is why we may | |
304 | * not assume anything about it... | |
305 | */ | |
306 | char *usbpath; | |
307 | const char *hidpath; | |
308 | struct hid_device_info *devs, *dev; | |
309 | int found; | |
310 | ||
311 | usbpath = g_strdup(path); | |
312 | hidpath = extract_hidapi_path(usbpath); | |
313 | if (!hidpath) { | |
314 | g_free(usbpath); | |
315 | return SR_ERR_NA; | |
316 | } | |
317 | ||
318 | devs = hid_enumerate(0x0000, 0x0000); | |
319 | found = 0; | |
320 | for (dev = devs; dev; dev = dev->next) { | |
321 | if (strcmp(dev->path, hidpath) != 0) | |
322 | continue; | |
323 | if (vid) | |
324 | *vid = dev->vendor_id; | |
325 | if (pid) | |
326 | *pid = dev->product_id; | |
327 | found = 1; | |
328 | break; | |
329 | } | |
330 | hid_free_enumeration(devs); | |
331 | g_free(usbpath); | |
332 | ||
333 | return found ? SR_OK : SR_ERR_NA; | |
334 | #endif | |
335 | } | |
336 | ||
337 | static int ser_hid_hidapi_open_dev(struct sr_serial_dev_inst *serial) | |
338 | { | |
339 | hid_device *hid_dev; | |
340 | ||
341 | if (!serial->usb_path || !*serial->usb_path) | |
342 | return SR_ERR_ARG; | |
343 | ||
344 | /* | |
345 | * A path is available, assume that either a GUI or a | |
346 | * user has copied what a previous listing has provided. | |
347 | * Or a scan determined a matching device's USB path. | |
348 | */ | |
349 | if (!serial->hid_path) | |
350 | serial->hid_path = extract_hidapi_path(serial->usb_path); | |
351 | hid_dev = hid_open_path(serial->hid_path); | |
edec0436 GS |
352 | if (!hid_dev) { |
353 | serial->hid_path = NULL; | |
354 | return SR_ERR_IO; | |
355 | } | |
356 | ||
357 | serial->hid_dev = hid_dev; | |
358 | hid_set_nonblocking(hid_dev, 1); | |
359 | ||
360 | return SR_OK; | |
361 | } | |
362 | ||
363 | static void ser_hid_hidapi_close_dev(struct sr_serial_dev_inst *serial) | |
364 | { | |
365 | if (serial->hid_dev) { | |
366 | hid_close(serial->hid_dev); | |
367 | serial->hid_dev = NULL; | |
368 | serial->hid_path = NULL; | |
369 | } | |
370 | g_slist_free_full(serial->hid_source_args, g_free); | |
371 | serial->hid_source_args = NULL; | |
372 | } | |
373 | ||
374 | struct hidapi_source_args_t { | |
375 | /* Application callback. */ | |
376 | sr_receive_data_callback cb; | |
377 | void *cb_data; | |
378 | /* The serial device, to store RX data. */ | |
379 | struct sr_serial_dev_inst *serial; | |
380 | }; | |
381 | ||
382 | /* | |
383 | * Gets periodically invoked by the glib main loop. "Drives" (checks) | |
384 | * progress of USB communication, and invokes the application's callback | |
385 | * which processes RX data (when some has become available), as well as | |
386 | * handles application level timeouts. | |
387 | */ | |
388 | static int hidapi_source_cb(int fd, int revents, void *cb_data) | |
389 | { | |
390 | struct hidapi_source_args_t *args; | |
391 | uint8_t rx_buf[SER_HID_CHUNK_SIZE]; | |
392 | int rc; | |
393 | ||
edec0436 GS |
394 | args = cb_data; |
395 | ||
396 | /* | |
397 | * Drain receive data which the chip might have pending. This is | |
398 | * "a copy" of the "background part" of ser_hid_read(), without | |
399 | * the timeout support code, and not knowing how much data the | |
400 | * application is expecting. | |
401 | */ | |
402 | do { | |
403 | rc = args->serial->hid_chip_funcs->read_bytes(args->serial, | |
404 | rx_buf, sizeof(rx_buf), 0); | |
405 | if (rc > 0) { | |
edec0436 GS |
406 | ser_hid_mask_databits(args->serial, rx_buf, rc); |
407 | sr_ser_queue_rx_data(args->serial, rx_buf, rc); | |
408 | } | |
409 | } while (rc > 0); | |
410 | ||
411 | /* | |
412 | * When RX data became available (now or earlier), pass this | |
413 | * condition to the application callback. Always periodically | |
414 | * run the application callback, since it handles timeouts and | |
415 | * might carry out other tasks as well like signalling progress. | |
416 | */ | |
417 | if (sr_ser_has_queued_data(args->serial)) | |
418 | revents |= G_IO_IN; | |
419 | rc = args->cb(fd, revents, args->cb_data); | |
edec0436 GS |
420 | |
421 | return rc; | |
422 | } | |
423 | ||
424 | #define WITH_MAXIMUM_TIMEOUT_VALUE 10 | |
425 | static int ser_hid_hidapi_setup_source_add(struct sr_session *session, | |
426 | struct sr_serial_dev_inst *serial, int events, int timeout, | |
427 | sr_receive_data_callback cb, void *cb_data) | |
428 | { | |
429 | struct hidapi_source_args_t *args; | |
430 | int rc; | |
431 | ||
edec0436 GS |
432 | (void)events; |
433 | ||
434 | /* Optionally enforce a minimum poll period. */ | |
435 | if (WITH_MAXIMUM_TIMEOUT_VALUE && timeout > WITH_MAXIMUM_TIMEOUT_VALUE) | |
436 | timeout = WITH_MAXIMUM_TIMEOUT_VALUE; | |
437 | ||
438 | /* Allocate status container for background data reception. */ | |
439 | args = g_malloc0(sizeof(*args)); | |
440 | args->cb = cb; | |
441 | args->cb_data = cb_data; | |
442 | args->serial = serial; | |
443 | ||
444 | /* | |
445 | * Have a periodic timer installed. Register the allocated block | |
446 | * with the serial device, since the GSource's finalizer won't | |
447 | * free the memory, and we haven't bothered to create a custom | |
448 | * HIDAPI specific GSource. | |
449 | */ | |
450 | rc = sr_session_source_add(session, -1, events, timeout, | |
451 | hidapi_source_cb, args); | |
edec0436 GS |
452 | if (rc != SR_OK) { |
453 | g_free(args); | |
454 | return rc; | |
455 | } | |
456 | serial->hid_source_args = g_slist_append(serial->hid_source_args, args); | |
457 | ||
458 | return SR_OK; | |
459 | } | |
460 | ||
461 | static int ser_hid_hidapi_setup_source_remove(struct sr_session *session, | |
462 | struct sr_serial_dev_inst *serial) | |
463 | { | |
464 | (void)serial; | |
465 | ||
edec0436 GS |
466 | (void)sr_session_source_remove(session, -1); |
467 | /* | |
468 | * Release callback args here already? Can there be more than | |
469 | * one source registered at any time, given that we pass fd -1 | |
470 | * which is used as the key for the session? | |
471 | */ | |
472 | ||
473 | return SR_OK; | |
474 | } | |
475 | ||
476 | SR_PRIV int ser_hid_hidapi_get_report(struct sr_serial_dev_inst *serial, | |
477 | uint8_t *data, size_t len) | |
478 | { | |
479 | int rc; | |
480 | ||
481 | rc = hid_get_feature_report(serial->hid_dev, data, len); | |
482 | if (rc < 0) | |
483 | return SR_ERR_IO; | |
484 | ||
485 | return rc; | |
486 | } | |
487 | ||
488 | SR_PRIV int ser_hid_hidapi_set_report(struct sr_serial_dev_inst *serial, | |
489 | const uint8_t *data, size_t len) | |
490 | { | |
491 | int rc; | |
492 | const wchar_t *err_text; | |
493 | ||
494 | rc = hid_send_feature_report(serial->hid_dev, data, len); | |
495 | if (rc < 0) { | |
496 | err_text = hid_error(serial->hid_dev); | |
497 | sr_dbg("%s() hidapi error: %ls", __func__, err_text); | |
498 | return SR_ERR_IO; | |
499 | } | |
500 | ||
501 | return rc; | |
502 | } | |
503 | ||
504 | SR_PRIV int ser_hid_hidapi_get_data(struct sr_serial_dev_inst *serial, | |
505 | uint8_t ep, uint8_t *data, size_t len, int timeout) | |
506 | { | |
507 | int rc; | |
508 | ||
509 | (void)ep; | |
510 | ||
511 | if (timeout) | |
512 | rc = hid_read_timeout(serial->hid_dev, data, len, timeout); | |
513 | else | |
514 | rc = hid_read(serial->hid_dev, data, len); | |
515 | if (rc < 0) | |
516 | return SR_ERR_IO; | |
517 | if (rc == 0) | |
518 | return 0; | |
519 | ||
520 | return rc; | |
521 | } | |
522 | ||
523 | SR_PRIV int ser_hid_hidapi_set_data(struct sr_serial_dev_inst *serial, | |
524 | uint8_t ep, const uint8_t *data, size_t len, int timeout) | |
525 | { | |
526 | int rc; | |
527 | ||
528 | (void)ep; | |
529 | (void)timeout; | |
530 | ||
531 | rc = hid_write(serial->hid_dev, data, len); | |
532 | if (rc < 0) | |
533 | return SR_ERR_IO; | |
534 | ||
535 | return rc; | |
536 | } | |
537 | ||
538 | /* }}} */ | |
539 | /* {{{ support for serial-over-HID chips */ | |
540 | ||
541 | static struct ser_hid_chip_functions **chips[SER_HID_CHIP_LAST] = { | |
542 | [SER_HID_CHIP_UNKNOWN] = NULL, | |
a10284cd | 543 | [SER_HID_CHIP_BTC_BU86X] = &ser_hid_chip_funcs_bu86x, |
616bc3a1 | 544 | [SER_HID_CHIP_SIL_CP2110] = &ser_hid_chip_funcs_cp2110, |
0cdb72c8 | 545 | [SER_HID_CHIP_VICTOR_DMM] = &ser_hid_chip_funcs_victor, |
828eeea2 | 546 | [SER_HID_CHIP_WCH_CH9325] = &ser_hid_chip_funcs_ch9325, |
edec0436 GS |
547 | }; |
548 | ||
549 | static struct ser_hid_chip_functions *get_hid_chip_funcs(enum ser_hid_chip_t chip) | |
550 | { | |
551 | struct ser_hid_chip_functions *funcs; | |
552 | ||
553 | if (chip >= ARRAY_SIZE(chips)) | |
554 | return NULL; | |
555 | if (!chips[chip]) | |
556 | return NULL; | |
557 | funcs = *chips[chip]; | |
558 | if (!funcs) | |
559 | return NULL; | |
560 | ||
561 | return funcs; | |
562 | } | |
563 | ||
564 | static int ser_hid_setup_funcs(struct sr_serial_dev_inst *serial) | |
565 | { | |
566 | ||
567 | if (!serial) | |
568 | return -1; | |
569 | ||
570 | if (serial->hid_chip && !serial->hid_chip_funcs) { | |
571 | serial->hid_chip_funcs = get_hid_chip_funcs(serial->hid_chip); | |
572 | if (!serial->hid_chip_funcs) | |
573 | return -1; | |
574 | } | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /* | |
580 | * Takes a pointer to the chip spec with potentially trailing data, | |
581 | * returns the chip index and advances the spec pointer upon match, | |
582 | * returns SER_HID_CHIP_UNKNOWN upon mismatch. | |
583 | */ | |
87307940 | 584 | static enum ser_hid_chip_t ser_hid_chip_find_enum(const char **spec_p) |
edec0436 | 585 | { |
87307940 | 586 | const gchar *spec; |
edec0436 GS |
587 | enum ser_hid_chip_t idx; |
588 | struct ser_hid_chip_functions *desc; | |
589 | ||
590 | if (!spec_p || !*spec_p) | |
591 | return SER_HID_CHIP_UNKNOWN; | |
592 | spec = *spec_p; | |
593 | if (!*spec) | |
594 | return SER_HID_CHIP_UNKNOWN; | |
595 | for (idx = 0; idx < SER_HID_CHIP_LAST; idx++) { | |
596 | desc = get_hid_chip_funcs(idx); | |
597 | if (!desc) | |
598 | continue; | |
599 | if (!desc->chipname) | |
600 | continue; | |
601 | if (!g_str_has_prefix(spec, desc->chipname)) | |
602 | continue; | |
603 | spec += strlen(desc->chipname); | |
604 | *spec_p = spec; | |
605 | return idx; | |
606 | } | |
607 | ||
608 | return SER_HID_CHIP_UNKNOWN; | |
609 | } | |
610 | ||
611 | /* See if we can find a chip name for a VID:PID spec. */ | |
612 | SR_PRIV const char *ser_hid_chip_find_name_vid_pid(uint16_t vid, uint16_t pid) | |
613 | { | |
614 | size_t chip_idx; | |
615 | struct ser_hid_chip_functions *desc; | |
616 | const struct vid_pid_item *vid_pids; | |
617 | ||
618 | for (chip_idx = 0; chip_idx < SER_HID_CHIP_LAST; chip_idx++) { | |
619 | desc = get_hid_chip_funcs(chip_idx); | |
620 | if (!desc) | |
621 | continue; | |
622 | if (!desc->chipname) | |
623 | continue; | |
624 | vid_pids = desc->vid_pid_items; | |
625 | if (!vid_pids) | |
626 | continue; | |
627 | while (vid_pids->vid) { | |
bf6b9e7b | 628 | if (vid_pids->vid == vid && vid_pids->pid == pid) |
edec0436 | 629 | return desc->chipname; |
edec0436 GS |
630 | vid_pids++; |
631 | } | |
632 | } | |
633 | ||
634 | return NULL; | |
635 | } | |
636 | ||
edec0436 GS |
637 | /** |
638 | * See if a text string is a valid USB path for a HID device. | |
639 | * @param[in] serial The serial port that is about to get opened. | |
640 | * @param[in] path The (assumed) USB path specification. | |
641 | * @return SR_OK upon success, SR_ERR* upon failure. | |
642 | */ | |
643 | static int try_open_path(struct sr_serial_dev_inst *serial, const char *path) | |
644 | { | |
645 | int rc; | |
646 | ||
647 | serial->usb_path = g_strdup(path); | |
648 | rc = ser_hid_hidapi_open_dev(serial); | |
649 | ser_hid_hidapi_close_dev(serial); | |
650 | g_free(serial->usb_path); | |
651 | serial->usb_path = NULL; | |
652 | ||
653 | return rc; | |
654 | } | |
655 | ||
656 | /** | |
657 | * Parse conn= specs for serial over HID communication. | |
658 | * | |
659 | * @param[in] serial The serial port that is about to get opened. | |
660 | * @param[in] spec The caller provided conn= specification. | |
661 | * @param[out] chip_ref Pointer to a chip type (enum). | |
662 | * @param[out] path_ref Pointer to a USB path (text string). | |
663 | * @param[out] serno_ref Pointer to a serial number (text string). | |
664 | * | |
665 | * @return 0 upon success, non-zero upon failure. Fills the *_ref output | |
666 | * values. | |
667 | * | |
668 | * @internal | |
669 | * | |
670 | * Summary of parsing rules as they are implemented: | |
671 | * - Insist on the "hid" prefix. Accept "hid" alone without any other | |
672 | * additional field. | |
673 | * - The first field that follows can be a chip spec, yet is optional. | |
674 | * - Any other field is assumed to be either a USB path or a serial | |
675 | * number. There is no point in specifying both of these, as either | |
676 | * of them uniquely identifies a device. | |
677 | * | |
678 | * Supported formats resulting from these rules: | |
679 | * hid[/<chip>] | |
680 | * hid[/<chip>]/usb=<bus>.<dev>[.<if>] | |
681 | * hid[/<chip>]/raw=<path> (may contain slashes!) | |
682 | * hid[/<chip>]/sn=serno | |
683 | * | |
684 | * This routine just parses the conn= spec, which either was provided by | |
685 | * a user, or may reflect (cite) an item of a previously gathered listing | |
686 | * (clipboard provided by CLI clients, or selected from a GUI form). | |
687 | * Another routine will fill in the blanks, and do the cable selection | |
688 | * when a filter was specified. | |
689 | * | |
690 | * Users will want to use short forms when they need to come up with the | |
691 | * specs by themselves. The "verbose" or seemingly redundant forms (chip | |
692 | * _and_ path/serno spec) are useful when the cable uses non-standard or | |
693 | * not-yet-supported VID:PID items when automatic chip detection fails. | |
694 | */ | |
695 | static int ser_hid_parse_conn_spec( | |
696 | struct sr_serial_dev_inst *serial, const char *spec, | |
697 | enum ser_hid_chip_t *chip_ref, char **path_ref, char **serno_ref) | |
698 | { | |
699 | const char *p; | |
700 | enum ser_hid_chip_t chip; | |
701 | char *path, *serno; | |
702 | int rc; | |
703 | ||
704 | if (chip_ref) | |
705 | *chip_ref = SER_HID_CHIP_UNKNOWN; | |
706 | if (path_ref) | |
707 | *path_ref = NULL; | |
708 | if (serno_ref) | |
709 | *serno_ref = NULL; | |
710 | chip = SER_HID_CHIP_UNKNOWN; | |
711 | path = serno = NULL; | |
712 | ||
713 | if (!serial || !spec || !*spec) | |
714 | return SR_ERR_ARG; | |
edec0436 GS |
715 | p = spec; |
716 | ||
717 | /* The "hid" prefix is mandatory. */ | |
60117e6e | 718 | if (!g_str_has_prefix(p, SER_HID_CONN_PREFIX)) |
edec0436 | 719 | return SR_ERR_ARG; |
edec0436 GS |
720 | p += strlen(SER_HID_CONN_PREFIX); |
721 | ||
722 | /* | |
723 | * Check for prefixed fields, assume chip type spec otherwise. | |
724 | * Paths and serial numbers "are greedy" (span to the end of | |
725 | * the input spec). Chip types are optional, and cannot repeat | |
726 | * multiple times. | |
727 | */ | |
728 | while (*p) { | |
729 | if (*p == '/') | |
730 | p++; | |
731 | if (!*p) | |
732 | break; | |
733 | if (g_str_has_prefix(p, SER_HID_USB_PREFIX)) { | |
734 | rc = try_open_path(serial, p); | |
edec0436 GS |
735 | if (rc != SR_OK) |
736 | return rc; | |
737 | path = g_strdup(p); | |
738 | p += strlen(p); | |
739 | } else if (g_str_has_prefix(p, SER_HID_RAW_PREFIX)) { | |
740 | rc = try_open_path(serial, p); | |
edec0436 GS |
741 | if (rc != SR_OK) |
742 | return rc; | |
743 | path = g_strdup(p); | |
744 | p += strlen(p); | |
745 | } else if (g_str_has_prefix(p, SER_HID_SNR_PREFIX)) { | |
746 | p += strlen(SER_HID_SNR_PREFIX); | |
edec0436 GS |
747 | serno = g_strdup(p); |
748 | p += strlen(p); | |
749 | } else if (!chip) { | |
87307940 GS |
750 | char *copy; |
751 | const char *endptr; | |
edec0436 GS |
752 | copy = g_strdup(p); |
753 | endptr = copy; | |
754 | chip = ser_hid_chip_find_enum(&endptr); | |
edec0436 GS |
755 | if (!chip) { |
756 | g_free(copy); | |
757 | return SR_ERR_ARG; | |
758 | } | |
759 | p += endptr - copy; | |
760 | g_free(copy); | |
edec0436 GS |
761 | } else { |
762 | sr_err("unsupported conn= spec %s, error at %s", spec, p); | |
763 | return SR_ERR_ARG; | |
764 | } | |
765 | if (*p == '/') | |
766 | p++; | |
767 | if (path || serno) | |
768 | break; | |
769 | } | |
770 | ||
edec0436 GS |
771 | if (chip_ref) |
772 | *chip_ref = chip; | |
773 | if (path_ref && path) | |
774 | *path_ref = path; | |
775 | if (serno_ref && serno) | |
776 | *serno_ref = serno; | |
777 | ||
778 | return SR_OK; | |
779 | } | |
780 | ||
781 | /* Get and compare serial number. Boolean return value. */ | |
782 | static int check_serno(const char *path, const char *serno_want) | |
783 | { | |
784 | char *usb_path; | |
785 | const char *hid_path; | |
786 | char serno_got[128]; | |
787 | int rc; | |
788 | ||
edec0436 GS |
789 | usb_path = g_strdup(path); |
790 | hid_path = extract_hidapi_path(usb_path); | |
791 | rc = ser_hid_hidapi_get_serno(hid_path, serno_got, sizeof(serno_got)); | |
edec0436 GS |
792 | g_free(usb_path); |
793 | if (rc) { | |
794 | sr_dbg("DBG: %s(), could not get serial number", __func__); | |
795 | return 0; | |
796 | } | |
edec0436 | 797 | |
60117e6e | 798 | return strcmp(serno_got, serno_want) == 0; |
edec0436 GS |
799 | } |
800 | ||
801 | static GSList *append_find(GSList *devs, const char *path) | |
802 | { | |
803 | char *copy; | |
804 | ||
805 | if (!path || !*path) | |
806 | return devs; | |
807 | ||
808 | copy = g_strdup(path); | |
809 | devs = g_slist_append(devs, copy); | |
810 | ||
811 | return devs; | |
812 | } | |
813 | ||
814 | static GSList *list_paths_for_vids_pids(const struct vid_pid_item *vid_pids) | |
815 | { | |
816 | GSList *list; | |
817 | size_t idx; | |
818 | uint16_t vid, pid; | |
819 | ||
820 | list = NULL; | |
821 | for (idx = 0; /* EMPTY */; idx++) { | |
822 | if (!vid_pids) { | |
823 | vid = pid = 0; | |
824 | } else if (!vid_pids[idx].vid) { | |
825 | break; | |
826 | } else { | |
827 | vid = vid_pids[idx].vid; | |
828 | pid = vid_pids[idx].pid; | |
829 | } | |
edec0436 GS |
830 | list = ser_hid_hidapi_find_usb(list, append_find, vid, pid); |
831 | if (!vid_pids) | |
832 | break; | |
833 | } | |
834 | ||
835 | return list; | |
836 | } | |
837 | ||
838 | /** | |
839 | * Search for a matching USB device for HID communication. | |
840 | * | |
841 | * @param[inout] chip The HID chip type (enum). | |
842 | * @param[inout] usbpath The USB path for the device (string). | |
843 | * @param[in] serno The serial number to search for. | |
844 | * | |
845 | * @retval SR_OK upon success | |
846 | * @retval SR_ERR_* upon failure. | |
847 | * | |
848 | * @internal | |
849 | * | |
850 | * This routine fills in blanks which the conn= spec parser left open. | |
851 | * When not specified yet, the HID chip type gets determined. When a | |
852 | * serial number was specified, then search the corresponding device. | |
853 | * Upon completion, the chip type and USB path for the device shall be | |
854 | * known, as these are essential for subsequent operation. | |
855 | */ | |
856 | static int ser_hid_chip_search(enum ser_hid_chip_t *chip_ref, | |
857 | char **path_ref, const char *serno) | |
858 | { | |
859 | enum ser_hid_chip_t chip; | |
860 | char *path; | |
861 | int have_chip, have_path, have_serno; | |
862 | struct ser_hid_chip_functions *chip_funcs; | |
863 | int rc; | |
864 | int serno_matched; | |
865 | uint16_t vid, pid; | |
866 | const char *name; | |
867 | const struct vid_pid_item *vid_pids; | |
868 | GSList *list, *matched, *matched2, *tmplist; | |
869 | ||
870 | if (!chip_ref) | |
871 | return SR_ERR_ARG; | |
872 | chip = *chip_ref; | |
873 | if (!path_ref) | |
874 | return SR_ERR_ARG; | |
875 | path = *path_ref; | |
edec0436 GS |
876 | |
877 | /* | |
878 | * Simplify the more complex conditions somewhat by assigning | |
879 | * to local variables. Handle the easiest conditions first. | |
880 | * - Either path or serial number can be specified, but not both | |
881 | * at the same time. | |
882 | * - When a USB path is given, immediately see which HID chip | |
883 | * the device has, without the need for enumeration. | |
884 | * - When a serial number is given, enumerate the devices and | |
885 | * search for that number. Either enumerate all devices of the | |
886 | * specified HID chip type (try the VID:PID pairs that we are | |
887 | * aware of), or try all HID devices for unknown chip types. | |
888 | * Not finding the serial number is fatal. | |
889 | * - When no path was found yet, enumerate the devices and pick | |
890 | * one of them. Try known VID:PID pairs for a HID chip, or all | |
891 | * devices for unknown chips. Make sure to pick a device of a | |
892 | * supported chip type if the chip was not specified. | |
893 | * - Determine the chip type if not yet known. There should be | |
894 | * a USB path by now, determined in one of the above blocks. | |
895 | */ | |
896 | have_chip = (chip != SER_HID_CHIP_UNKNOWN) ? 1 : 0; | |
897 | have_path = (path && *path) ? 1 : 0; | |
898 | have_serno = (serno && *serno) ? 1 : 0; | |
edec0436 GS |
899 | if (have_path && have_serno) { |
900 | sr_err("Unsupported combination of USB path and serno"); | |
901 | return SR_ERR_ARG; | |
902 | } | |
903 | chip_funcs = have_chip ? get_hid_chip_funcs(chip) : NULL; | |
904 | if (have_chip && !chip_funcs) | |
905 | return SR_ERR_NA; | |
906 | if (have_chip && !chip_funcs->vid_pid_items) | |
907 | return SR_ERR_NA; | |
908 | if (have_path && !have_chip) { | |
edec0436 GS |
909 | vid = pid = 0; |
910 | rc = ser_hid_hidapi_get_vid_pid(path, &vid, &pid); | |
edec0436 GS |
911 | if (rc != SR_OK) |
912 | return rc; | |
913 | name = ser_hid_chip_find_name_vid_pid(vid, pid); | |
edec0436 GS |
914 | if (!name || !*name) |
915 | return SR_ERR_NA; | |
87307940 | 916 | chip = ser_hid_chip_find_enum(&name); |
edec0436 GS |
917 | if (chip == SER_HID_CHIP_UNKNOWN) |
918 | return SR_ERR_NA; | |
919 | have_chip = 1; | |
920 | } | |
921 | if (have_serno) { | |
edec0436 GS |
922 | vid_pids = have_chip ? chip_funcs->vid_pid_items : NULL; |
923 | list = list_paths_for_vids_pids(vid_pids); | |
edec0436 GS |
924 | if (!list) |
925 | return SR_ERR_NA; | |
926 | matched = NULL; | |
927 | for (tmplist = list; tmplist; tmplist = tmplist->next) { | |
928 | path = get_hidapi_path_copy(tmplist->data); | |
edec0436 GS |
929 | serno_matched = check_serno(path, serno); |
930 | g_free(path); | |
931 | if (!serno_matched) | |
932 | continue; | |
933 | matched = tmplist; | |
934 | break; | |
935 | } | |
936 | if (!matched) | |
937 | return SR_ERR_NA; | |
938 | path = g_strdup(matched->data); | |
edec0436 GS |
939 | have_path = 1; |
940 | g_slist_free_full(list, g_free); | |
941 | } | |
942 | if (!have_path) { | |
edec0436 GS |
943 | vid_pids = have_chip ? chip_funcs->vid_pid_items : NULL; |
944 | list = list_paths_for_vids_pids(vid_pids); | |
945 | if (!list) | |
946 | return SR_ERR_NA; | |
edec0436 GS |
947 | matched = matched2 = NULL; |
948 | if (have_chip) { | |
949 | /* List already only contains specified chip. */ | |
950 | matched = list; | |
edec0436 | 951 | matched2 = list->next; |
edec0436 GS |
952 | } |
953 | /* Works for lists with one or multiple chips. Saves indentation. */ | |
954 | for (tmplist = list; tmplist; tmplist = tmplist->next) { | |
955 | if (have_chip) | |
956 | break; | |
957 | path = tmplist->data; | |
958 | rc = ser_hid_hidapi_get_vid_pid(path, &vid, &pid); | |
959 | if (rc || !ser_hid_chip_find_name_vid_pid(vid, pid)) | |
960 | continue; | |
961 | if (!matched) { | |
962 | matched = tmplist; | |
edec0436 GS |
963 | continue; |
964 | } | |
965 | if (!matched2) { | |
966 | matched2 = tmplist; | |
edec0436 GS |
967 | break; |
968 | } | |
969 | } | |
970 | if (!matched) { | |
971 | g_slist_free_full(list, g_free); | |
972 | return SR_ERR_NA; | |
973 | } | |
974 | /* | |
975 | * TODO Optionally fail harder, expect users to provide | |
976 | * unambiguous cable specs. | |
977 | */ | |
978 | if (matched2) | |
979 | sr_info("More than one cable matches, random pick."); | |
980 | path = get_hidapi_path_copy(matched->data); | |
edec0436 GS |
981 | have_path = 1; |
982 | g_slist_free_full(list, g_free); | |
983 | } | |
984 | if (have_path && !have_chip) { | |
edec0436 GS |
985 | vid = pid = 0; |
986 | rc = ser_hid_hidapi_get_vid_pid(path, &vid, &pid); | |
edec0436 GS |
987 | if (rc != SR_OK) |
988 | return rc; | |
989 | name = ser_hid_chip_find_name_vid_pid(vid, pid); | |
edec0436 GS |
990 | if (!name || !*name) |
991 | return SR_ERR_NA; | |
87307940 | 992 | chip = ser_hid_chip_find_enum(&name); |
edec0436 GS |
993 | if (chip == SER_HID_CHIP_UNKNOWN) |
994 | return SR_ERR_NA; | |
995 | have_chip = 1; | |
996 | } | |
997 | ||
edec0436 GS |
998 | if (chip_ref) |
999 | *chip_ref = chip; | |
1000 | if (path_ref) | |
1001 | *path_ref = path; | |
1002 | ||
1003 | return SR_OK; | |
1004 | } | |
1005 | ||
1006 | /* }}} */ | |
1007 | /* {{{ transport methods called by the common serial.c code */ | |
1008 | ||
1009 | /* See if a serial port's name refers to an HID type. */ | |
1010 | SR_PRIV int ser_name_is_hid(struct sr_serial_dev_inst *serial) | |
1011 | { | |
1012 | size_t off; | |
1013 | char sep; | |
1014 | ||
1015 | if (!serial) | |
1016 | return 0; | |
1017 | if (!serial->port || !*serial->port) | |
1018 | return 0; | |
1019 | ||
1020 | /* Accept either "hid" alone, or "hid/" as a prefix. */ | |
1021 | if (!g_str_has_prefix(serial->port, SER_HID_CONN_PREFIX)) | |
1022 | return 0; | |
1023 | off = strlen(SER_HID_CONN_PREFIX); | |
1024 | sep = serial->port[off]; | |
1025 | if (sep != '\0' && sep != '/') | |
1026 | return 0; | |
1027 | ||
1028 | return 1; | |
1029 | } | |
1030 | ||
1031 | static int ser_hid_open(struct sr_serial_dev_inst *serial, int flags) | |
1032 | { | |
1033 | enum ser_hid_chip_t chip; | |
1034 | char *usbpath, *serno; | |
1035 | int rc; | |
1036 | ||
1037 | (void)flags; | |
1038 | ||
1039 | if (ser_hid_setup_funcs(serial) != 0) { | |
1040 | sr_err("Cannot determine HID communication library."); | |
1041 | return SR_ERR_NA; | |
1042 | } | |
1043 | ||
1044 | rc = ser_hid_parse_conn_spec(serial, serial->port, | |
1045 | &chip, &usbpath, &serno); | |
1046 | if (rc != SR_OK) | |
1047 | return SR_ERR_ARG; | |
1048 | ||
1049 | /* | |
1050 | * When a serial number was specified, or when the chip type or | |
1051 | * the USB path were not specified, do a search to determine the | |
1052 | * device's USB path. | |
1053 | */ | |
1054 | if (!chip || !usbpath || serno) { | |
edec0436 GS |
1055 | rc = ser_hid_chip_search(&chip, &usbpath, serno); |
1056 | if (rc != 0) | |
1057 | return SR_ERR_NA; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * Open the HID device. Only store chip type and device handle | |
1062 | * when open completes successfully. | |
1063 | */ | |
1064 | serial->hid_chip = chip; | |
1065 | if (ser_hid_setup_funcs(serial) != 0) { | |
1066 | sr_err("Cannot determine HID chip specific routines."); | |
1067 | return SR_ERR_NA; | |
1068 | } | |
1069 | if (usbpath && *usbpath) | |
1070 | serial->usb_path = usbpath; | |
1071 | if (serno && *serno) | |
1072 | serial->usb_serno = serno; | |
1073 | ||
1074 | rc = ser_hid_hidapi_open_dev(serial); | |
1075 | if (rc) { | |
1076 | sr_err("Failed to open HID device."); | |
1077 | serial->hid_chip = 0; | |
1078 | g_free(serial->usb_path); | |
1079 | serial->usb_path = NULL; | |
1080 | g_free(serial->usb_serno); | |
1081 | serial->usb_serno = NULL; | |
1082 | return SR_ERR_IO; | |
1083 | } | |
edec0436 GS |
1084 | |
1085 | if (!serial->rcv_buffer) | |
1086 | serial->rcv_buffer = g_string_sized_new(SER_HID_CHUNK_SIZE); | |
1087 | ||
1088 | return SR_OK; | |
1089 | } | |
1090 | ||
1091 | static int ser_hid_close(struct sr_serial_dev_inst *serial) | |
1092 | { | |
edec0436 GS |
1093 | ser_hid_hidapi_close_dev(serial); |
1094 | ||
1095 | return SR_OK; | |
1096 | } | |
1097 | ||
1098 | static int ser_hid_set_params(struct sr_serial_dev_inst *serial, | |
1099 | int baudrate, int bits, int parity, int stopbits, | |
1100 | int flowcontrol, int rts, int dtr) | |
1101 | { | |
edec0436 GS |
1102 | if (ser_hid_setup_funcs(serial) != 0) |
1103 | return SR_ERR_NA; | |
edec0436 GS |
1104 | if (!serial->hid_chip_funcs || !serial->hid_chip_funcs->set_params) |
1105 | return SR_ERR_NA; | |
60117e6e GS |
1106 | |
1107 | return serial->hid_chip_funcs->set_params(serial, | |
edec0436 GS |
1108 | baudrate, bits, parity, stopbits, |
1109 | flowcontrol, rts, dtr); | |
edec0436 GS |
1110 | } |
1111 | ||
1112 | static int ser_hid_setup_source_add(struct sr_session *session, | |
1113 | struct sr_serial_dev_inst *serial, int events, int timeout, | |
1114 | sr_receive_data_callback cb, void *cb_data) | |
1115 | { | |
1116 | return ser_hid_hidapi_setup_source_add(session, serial, | |
1117 | events, timeout, cb, cb_data); | |
1118 | } | |
1119 | ||
1120 | static int ser_hid_setup_source_remove(struct sr_session *session, | |
1121 | struct sr_serial_dev_inst *serial) | |
1122 | { | |
1123 | return ser_hid_hidapi_setup_source_remove(session, serial); | |
1124 | } | |
1125 | ||
1126 | static GSList *ser_hid_list(GSList *list, sr_ser_list_append_t append) | |
1127 | { | |
1128 | return ser_hid_hidapi_list(list, append); | |
1129 | } | |
1130 | ||
1131 | static GSList *ser_hid_find_usb(GSList *list, sr_ser_find_append_t append, | |
1132 | uint16_t vendor_id, uint16_t product_id) | |
1133 | { | |
1134 | return ser_hid_hidapi_find_usb(list, append, vendor_id, product_id); | |
1135 | } | |
1136 | ||
1137 | static int ser_hid_flush(struct sr_serial_dev_inst *serial) | |
1138 | { | |
1139 | if (!serial->hid_chip_funcs || !serial->hid_chip_funcs->flush) | |
1140 | return SR_ERR_NA; | |
1141 | ||
1142 | return serial->hid_chip_funcs->flush(serial); | |
1143 | } | |
1144 | ||
1145 | static int ser_hid_drain(struct sr_serial_dev_inst *serial) | |
1146 | { | |
1147 | if (!serial->hid_chip_funcs || !serial->hid_chip_funcs->drain) | |
1148 | return SR_ERR_NA; | |
1149 | ||
1150 | return serial->hid_chip_funcs->drain(serial); | |
1151 | } | |
1152 | ||
1153 | static int ser_hid_write(struct sr_serial_dev_inst *serial, | |
1154 | const void *buf, size_t count, | |
1155 | int nonblocking, unsigned int timeout_ms) | |
1156 | { | |
1157 | int total, max_chunk, chunk_len; | |
1158 | int rc; | |
1159 | ||
1160 | if (!serial->hid_chip_funcs || !serial->hid_chip_funcs->write_bytes) | |
1161 | return SR_ERR_NA; | |
1162 | if (!serial->hid_chip_funcs->max_bytes_per_request) | |
1163 | return SR_ERR_NA; | |
1164 | ||
edec0436 GS |
1165 | total = 0; |
1166 | max_chunk = serial->hid_chip_funcs->max_bytes_per_request; | |
1167 | while (count > 0) { | |
1168 | chunk_len = count; | |
1169 | if (max_chunk && chunk_len > max_chunk) | |
1170 | chunk_len = max_chunk; | |
1171 | rc = serial->hid_chip_funcs->write_bytes(serial, buf, chunk_len); | |
1172 | if (rc < 0) { | |
1173 | sr_err("Error sending transmit data to HID device."); | |
1174 | return total; | |
1175 | } | |
1176 | if (rc != chunk_len) { | |
1177 | sr_warn("Short transmission to HID device (%d/%d bytes)?", | |
1178 | rc, chunk_len); | |
1179 | return total; | |
1180 | } | |
1181 | buf += chunk_len; | |
1182 | count -= chunk_len; | |
1183 | total += chunk_len; | |
1184 | /* TODO | |
1185 | * Need we wait here? For data to drain through the slow | |
1186 | * UART. Not all UART-over-HID chips will have FIFOs. | |
1187 | */ | |
1188 | if (!nonblocking) { | |
1189 | (void)timeout_ms; | |
1190 | /* TODO */ | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | return total; | |
1195 | } | |
1196 | ||
1197 | static int ser_hid_read(struct sr_serial_dev_inst *serial, | |
1198 | void *buf, size_t count, | |
1199 | int nonblocking, unsigned int timeout_ms) | |
1200 | { | |
1201 | gint64 deadline_us, now_us; | |
1202 | uint8_t buffer[SER_HID_CHUNK_SIZE]; | |
1203 | int rc; | |
1204 | unsigned int got; | |
1205 | ||
edec0436 GS |
1206 | if (!serial->hid_chip_funcs || !serial->hid_chip_funcs->read_bytes) |
1207 | return SR_ERR_NA; | |
1208 | if (!serial->hid_chip_funcs->max_bytes_per_request) | |
1209 | return SR_ERR_NA; | |
1210 | ||
1211 | /* | |
1212 | * Immediately satisfy the caller's request from the RX buffer | |
1213 | * if the requested amount of data is available already. | |
1214 | */ | |
bf6b9e7b UH |
1215 | if (sr_ser_has_queued_data(serial) >= count) |
1216 | return sr_ser_unqueue_rx_data(serial, buf, count); | |
edec0436 GS |
1217 | |
1218 | /* | |
1219 | * When a timeout was specified, then determine the deadline | |
1220 | * where to stop reception. | |
1221 | */ | |
1222 | deadline_us = 0; | |
1223 | now_us = 0; /* Silence a (false) compiler warning. */ | |
1224 | if (timeout_ms) { | |
1225 | now_us = g_get_monotonic_time(); | |
1226 | deadline_us = now_us + timeout_ms * 1000; | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * Keep receiving from the port until the caller's requested | |
1231 | * amount of data has become available, or the timeout has | |
1232 | * expired. In the absence of a timeout, stop reading when an | |
1233 | * attempt no longer yields receive data. | |
1234 | * | |
1235 | * This implementation assumes that applications will call the | |
1236 | * read routine often enough, or that reception continues in | |
1237 | * background, such that data is not lost and hardware and | |
1238 | * software buffers won't overrun. | |
1239 | */ | |
1240 | while (TRUE) { | |
1241 | /* | |
1242 | * Determine the timeout (in milliseconds) for this | |
1243 | * iteration. The 'now_us' timestamp was initially | |
1244 | * determined above, and gets updated at the bottom of | |
1245 | * the loop. | |
1246 | */ | |
1247 | if (deadline_us) { | |
1248 | timeout_ms = (deadline_us - now_us) / 1000; | |
1249 | if (!timeout_ms) | |
1250 | timeout_ms = 1; | |
1251 | } else if (nonblocking) { | |
1252 | timeout_ms = 10; | |
1253 | } else { | |
1254 | timeout_ms = 0; | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * Check the HID transport for the availability of more | |
1259 | * receive data. | |
1260 | */ | |
1261 | rc = serial->hid_chip_funcs->read_bytes(serial, | |
1262 | buffer, sizeof(buffer), timeout_ms); | |
1263 | if (rc < 0) { | |
1264 | sr_dbg("DBG: %s() read error %d.", __func__, rc); | |
1265 | return SR_ERR; | |
1266 | } | |
1267 | if (rc) { | |
edec0436 GS |
1268 | ser_hid_mask_databits(serial, buffer, rc); |
1269 | sr_ser_queue_rx_data(serial, buffer, rc); | |
1270 | } | |
1271 | got = sr_ser_has_queued_data(serial); | |
1272 | ||
1273 | /* | |
1274 | * Stop reading when the requested amount is available, | |
1275 | * or when the timeout has expired. | |
1276 | * | |
1277 | * TODO Consider whether grabbing all RX data is more | |
1278 | * desirable. Implementing this approach requires a cheap | |
1279 | * check for the availability of more data on the USB level. | |
1280 | */ | |
1281 | if (got >= count) | |
1282 | break; | |
1283 | if (nonblocking && !rc) | |
1284 | break; | |
1285 | if (deadline_us) { | |
1286 | now_us = g_get_monotonic_time(); | |
1287 | if (now_us >= deadline_us) { | |
1288 | sr_dbg("DBG: %s() read loop timeout.", __func__); | |
1289 | break; | |
1290 | } | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | /* | |
1295 | * Satisfy the caller's demand for receive data from previously | |
1296 | * queued incoming data. | |
1297 | */ | |
1298 | if (got > count) | |
1299 | got = count; | |
edec0436 | 1300 | |
bf6b9e7b | 1301 | return sr_ser_unqueue_rx_data(serial, buf, count); |
edec0436 GS |
1302 | } |
1303 | ||
1304 | static struct ser_lib_functions serlib_hid = { | |
1305 | .open = ser_hid_open, | |
1306 | .close = ser_hid_close, | |
1307 | .flush = ser_hid_flush, | |
1308 | .drain = ser_hid_drain, | |
1309 | .write = ser_hid_write, | |
1310 | .read = ser_hid_read, | |
1311 | .set_params = ser_hid_set_params, | |
1312 | .setup_source_add = ser_hid_setup_source_add, | |
1313 | .setup_source_remove = ser_hid_setup_source_remove, | |
1314 | .list = ser_hid_list, | |
1315 | .find_usb = ser_hid_find_usb, | |
1316 | .get_frame_format = NULL, | |
1317 | }; | |
1318 | SR_PRIV struct ser_lib_functions *ser_lib_funcs_hid = &serlib_hid; | |
1319 | ||
1320 | /* }}} */ | |
1321 | #else | |
1322 | ||
4417074c GS |
1323 | SR_PRIV int ser_name_is_hid(struct sr_serial_dev_inst *serial) |
1324 | { | |
1325 | (void)serial; | |
1326 | ||
1327 | return 0; | |
1328 | } | |
1329 | ||
1330 | SR_PRIV struct ser_lib_functions *ser_lib_funcs_hid = NULL; | |
edec0436 GS |
1331 | |
1332 | #endif | |
1333 | #endif | |
1334 | /** @} */ |