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b79c3422 GS |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2018-2019 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> | |
21 | #include <glib.h> | |
22 | #include <libsigrok/libsigrok.h> | |
23 | #include "libsigrok-internal.h" | |
24 | #include <string.h> | |
25 | #include <memory.h> | |
26 | ||
b79c3422 | 27 | #define LOG_PREFIX "serial-bt" |
b79c3422 GS |
28 | |
29 | #ifdef HAVE_SERIAL_COMM | |
30 | #ifdef HAVE_BLUETOOTH | |
31 | ||
32 | #define SER_BT_CONN_PREFIX "bt" | |
33 | #define SER_BT_CHUNK_SIZE 1200 | |
34 | ||
0e4a85a9 GS |
35 | #define SER_BT_PARAM_PREFIX_CHANNEL "channel=" |
36 | #define SER_BT_PARAM_PREFIX_HDL_RX "handle_rx=" | |
37 | #define SER_BT_PARAM_PREFIX_HDL_TX "handle_tx=" | |
38 | #define SER_BT_PARAM_PREFIX_HDL_CCCD "handle_cccd=" | |
39 | #define SER_BT_PARAM_PREFIX_VAL_CCCD "value_cccd=" | |
40 | ||
b79c3422 GS |
41 | /** |
42 | * @file | |
43 | * | |
44 | * Serial port handling, wraps the external BT/BLE dependencies. | |
45 | */ | |
46 | ||
47 | /** | |
48 | * @defgroup grp_serial_bt Serial port handling, BT/BLE group | |
49 | * | |
50 | * Make serial-over-BT communication appear like a regular serial port. | |
51 | * | |
52 | * @{ | |
53 | */ | |
54 | ||
55 | /* {{{ support for serial-over-BT channels */ | |
56 | ||
ca98f7ae GS |
57 | /* |
58 | * This builtin database of known devices (keyed by their names as | |
59 | * provided during BT/BLE scans) can help improve the presentation of | |
60 | * scan results. Ideally users could take the output and pass it to | |
61 | * subsequent program invocations, not having to "come up with" the | |
62 | * conn= spec, or only having to touch it up minimally. GUI dialogs | |
63 | * could present scan results such that users just need to pick an | |
64 | * item to open a connection. | |
65 | * | |
66 | * The current implementation guesses connection types from device | |
67 | * names, and optionally amends them with additional parameters if | |
68 | * experience shows that individual devices need these extra specs. | |
69 | * | |
70 | * This database may have to move to a separate source file should | |
71 | * its size grow to amounts that are considered inappropriate here | |
72 | * in the serial transport's BT dispatcher. For now the item count | |
73 | * is small. | |
74 | */ | |
75 | ||
b79c3422 GS |
76 | static const struct scan_supported_item { |
77 | const char *name; | |
78 | enum ser_bt_conn_t type; | |
c622c88c | 79 | const char *add_params; |
b79c3422 | 80 | } scan_supported_items[] = { |
c622c88c GS |
81 | { "121GW", SER_BT_CONN_BLE122, NULL, }, |
82 | { "Adafruit Bluefruit LE 8134", SER_BT_CONN_NRF51, NULL, }, | |
83 | { "HC-05", SER_BT_CONN_RFCOMM, NULL, }, | |
84 | { "UM25C", SER_BT_CONN_RFCOMM, NULL, }, | |
85 | { NULL, SER_BT_CONN_UNKNOWN, NULL, }, | |
b79c3422 GS |
86 | }; |
87 | ||
ca98f7ae GS |
88 | static const struct scan_supported_item *scan_is_supported(const char *name) |
89 | { | |
90 | size_t idx; | |
91 | const struct scan_supported_item *item; | |
92 | ||
93 | for (idx = 0; idx < ARRAY_SIZE(scan_supported_items); idx++) { | |
94 | item = &scan_supported_items[idx]; | |
95 | if (!item->name) | |
96 | break; | |
97 | if (strcmp(name, item->name) != 0) | |
98 | continue; | |
99 | return item; | |
100 | } | |
101 | ||
102 | return NULL; | |
103 | } | |
104 | ||
b79c3422 GS |
105 | static const char *ser_bt_conn_names[SER_BT_CONN_MAX] = { |
106 | [SER_BT_CONN_UNKNOWN] = "<type>", | |
107 | [SER_BT_CONN_RFCOMM] = "rfcomm", | |
108 | [SER_BT_CONN_BLE122] = "ble122", | |
109 | [SER_BT_CONN_NRF51] = "nrf51", | |
110 | [SER_BT_CONN_CC254x] = "cc254x", | |
111 | }; | |
112 | ||
113 | static enum ser_bt_conn_t lookup_conn_name(const char *name) | |
114 | { | |
115 | size_t idx; | |
116 | const char *item; | |
117 | ||
118 | if (!name || !*name) | |
119 | return SER_BT_CONN_UNKNOWN; | |
120 | idx = ARRAY_SIZE(ser_bt_conn_names); | |
121 | while (idx-- > 0) { | |
122 | item = ser_bt_conn_names[idx]; | |
123 | if (strcmp(item, name) == 0) | |
124 | return idx; | |
125 | } | |
126 | ||
127 | return SER_BT_CONN_UNKNOWN; | |
128 | } | |
129 | ||
130 | static const char *conn_name_text(enum ser_bt_conn_t type) | |
131 | { | |
132 | if (type >= ARRAY_SIZE(ser_bt_conn_names)) | |
133 | type = SER_BT_CONN_UNKNOWN; | |
134 | ||
135 | return ser_bt_conn_names[type]; | |
136 | } | |
137 | ||
138 | /** | |
139 | * Parse conn= specs for serial over Bluetooth communication. | |
140 | * | |
141 | * @param[in] serial The serial port that is about to get opened. | |
142 | * @param[in] spec The caller provided conn= specification. | |
143 | * @param[out] conn_type The type of BT comm (BT RFCOMM, BLE notify). | |
144 | * @param[out] remote_addr The remote device address. | |
145 | * @param[out] rfcomm_channel The RFCOMM channel (if applicable). | |
146 | * @param[out] read_hdl The BLE notify read handle (if applicable). | |
147 | * @param[out] write_hdl The BLE notify write handle (if applicable). | |
148 | * @param[out] cccd_hdl The BLE notify CCCD handle (if applicable). | |
149 | * @param[out] cccd_val The BLE notify CCCD value (if applicable). | |
150 | * | |
151 | * @return 0 upon success, non-zero upon failure. | |
152 | * | |
b79c3422 GS |
153 | * Summary of parsing rules as they are implemented: |
154 | * - Implementor's note: Automatic scan for available devices is not | |
155 | * yet implemented. So strictly speaking some parts of the input | |
156 | * spec are optional, but fallbacks may not take effect ATM. | |
157 | * - Insist on the "bt" prefix. Accept "bt" alone without any other | |
158 | * additional field. | |
159 | * - The first field that follows is the connection type. Supported | |
160 | * types are 'rfcomm', 'ble122', 'cc254x', and potentially others | |
161 | * in a future implementation. | |
162 | * - The next field is the remote device's address, either separated | |
163 | * by colons or dashes or spaces, or not separated at all. | |
164 | * - Other parameters (RFCOMM channel, notify handles and write values) | |
ee617d62 GS |
165 | * get derived from the connection type. |
166 | * - More fields after the remote address are options which override | |
167 | * builtin defaults (RFCOMM channels, BLE handles, etc). | |
b79c3422 GS |
168 | * |
169 | * Supported formats resulting from these rules: | |
ee617d62 | 170 | * bt/<conn>/<addr>[/<param>]... |
b79c3422 GS |
171 | * |
172 | * Examples: | |
173 | * bt/rfcomm/11-22-33-44-55-66 | |
ee617d62 | 174 | * bt/rfcomm/11-22-33-44-55-66/channel=2 |
b79c3422 GS |
175 | * bt/ble122/88:6b:12:34:56:78 |
176 | * bt/cc254x/0123456789ab | |
177 | * | |
178 | * It's assumed that users easily can create those conn= specs from | |
179 | * available information, or that scan routines will create such specs | |
180 | * that copy'n'paste results (or GUI choices from previous scan results) | |
181 | * can get processed here. | |
182 | */ | |
183 | static int ser_bt_parse_conn_spec( | |
184 | struct sr_serial_dev_inst *serial, const char *spec, | |
185 | enum ser_bt_conn_t *conn_type, const char **remote_addr, | |
186 | size_t *rfcomm_channel, | |
187 | uint16_t *read_hdl, uint16_t *write_hdl, | |
188 | uint16_t *cccd_hdl, uint16_t *cccd_val) | |
189 | { | |
819277b5 | 190 | char **fields, *field; |
b79c3422 GS |
191 | enum ser_bt_conn_t type; |
192 | const char *addr; | |
0e4a85a9 GS |
193 | int ret_parse, ret; |
194 | size_t fields_count, field_idx; | |
195 | char *endp; | |
196 | unsigned long parm_val; | |
b79c3422 GS |
197 | |
198 | if (conn_type) | |
199 | *conn_type = SER_BT_CONN_UNKNOWN; | |
200 | if (remote_addr) | |
201 | *remote_addr = NULL; | |
202 | if (rfcomm_channel) | |
203 | *rfcomm_channel = 0; | |
204 | if (read_hdl) | |
205 | *read_hdl = 0; | |
206 | if (write_hdl) | |
207 | *write_hdl = 0; | |
208 | if (cccd_hdl) | |
209 | *cccd_hdl = 0; | |
210 | if (cccd_val) | |
211 | *cccd_val = 0; | |
212 | ||
b79c3422 GS |
213 | if (!serial || !spec || !spec[0]) |
214 | return SR_ERR_ARG; | |
215 | ||
216 | /* Evaluate the mandatory first three fields. */ | |
217 | fields = g_strsplit_set(spec, "/", 0); | |
218 | if (!fields) | |
219 | return SR_ERR_ARG; | |
220 | if (g_strv_length(fields) < 3) { | |
221 | g_strfreev(fields); | |
222 | return SR_ERR_ARG; | |
223 | } | |
224 | field = fields[0]; | |
225 | if (strcmp(field, SER_BT_CONN_PREFIX) != 0) { | |
226 | g_strfreev(fields); | |
227 | return SR_ERR_ARG; | |
228 | } | |
229 | field = fields[1]; | |
230 | type = lookup_conn_name(field); | |
231 | if (!type) { | |
232 | g_strfreev(fields); | |
233 | return SR_ERR_ARG; | |
234 | } | |
235 | if (conn_type) | |
236 | *conn_type = type; | |
237 | field = fields[2]; | |
238 | if (!field || !*field) { | |
239 | g_strfreev(fields); | |
240 | return SR_ERR_ARG; | |
241 | } | |
242 | addr = g_strdup(field); | |
243 | if (remote_addr) | |
244 | *remote_addr = addr; | |
245 | ||
246 | /* Derive default parameters that match the connection type. */ | |
247 | /* TODO Lookup defaults from a table? */ | |
248 | switch (type) { | |
249 | case SER_BT_CONN_RFCOMM: | |
250 | if (rfcomm_channel) | |
251 | *rfcomm_channel = 1; | |
252 | break; | |
253 | case SER_BT_CONN_BLE122: | |
254 | if (read_hdl) | |
255 | *read_hdl = 8; | |
256 | if (write_hdl) | |
257 | *write_hdl = 0; | |
258 | if (cccd_hdl) | |
259 | *cccd_hdl = 9; | |
260 | if (cccd_val) | |
261 | *cccd_val = 0x0003; | |
262 | break; | |
263 | case SER_BT_CONN_NRF51: | |
264 | /* TODO | |
265 | * Are these values appropriate? Check the learn article at | |
266 | * https://learn.adafruit.com/introducing-the-adafruit-bluefruit-le-uart-friend?view=all | |
267 | */ | |
268 | if (read_hdl) | |
269 | *read_hdl = 13; | |
270 | if (write_hdl) | |
271 | *write_hdl = 11; | |
272 | if (cccd_hdl) | |
273 | *cccd_hdl = 14; | |
274 | if (cccd_val) | |
275 | *cccd_val = 0x0001; | |
276 | /* TODO 'random' type, sec-level=high */ | |
277 | break; | |
278 | case SER_BT_CONN_CC254x: | |
279 | /* TODO Are these values appropriate? Just guessing here. */ | |
280 | if (read_hdl) | |
281 | *read_hdl = 20; | |
282 | if (write_hdl) | |
283 | *write_hdl = 0; | |
284 | if (cccd_hdl) | |
285 | *cccd_hdl = 21; | |
286 | if (cccd_val) | |
287 | *cccd_val = 0x0001; | |
288 | break; | |
289 | default: | |
290 | return SR_ERR_ARG; | |
291 | } | |
292 | ||
0e4a85a9 GS |
293 | /* |
294 | * Preset a successful return value for the conn= parse call. | |
295 | * Scan optional additional fields which specify more params. | |
296 | * Update the defaults which were setup above. Pessimize the | |
297 | * routine's return value in error paths. | |
298 | */ | |
299 | ret_parse = SR_OK; | |
300 | fields_count = g_strv_length(fields); | |
301 | for (field_idx = 3; field_idx < fields_count; field_idx++) { | |
302 | field = fields[field_idx]; | |
303 | if (!field || !*field) | |
304 | continue; | |
305 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_CHANNEL)) { | |
306 | field += strlen(SER_BT_PARAM_PREFIX_CHANNEL); | |
307 | endp = NULL; | |
308 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
309 | if (ret != SR_OK || !endp || *endp != '\0') { | |
310 | ret_parse = SR_ERR_ARG; | |
311 | break; | |
312 | } | |
313 | if (rfcomm_channel) | |
314 | *rfcomm_channel = parm_val; | |
315 | continue; | |
316 | } | |
317 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_HDL_RX)) { | |
318 | field += strlen(SER_BT_PARAM_PREFIX_HDL_RX); | |
319 | endp = NULL; | |
320 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
321 | if (ret != SR_OK || !endp || *endp != '\0') { | |
322 | ret_parse = SR_ERR_ARG; | |
323 | break; | |
324 | } | |
325 | if (read_hdl) | |
326 | *read_hdl = parm_val; | |
327 | continue; | |
328 | } | |
329 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_HDL_TX)) { | |
330 | field += strlen(SER_BT_PARAM_PREFIX_HDL_TX); | |
331 | endp = NULL; | |
332 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
333 | if (ret != SR_OK || !endp || *endp != '\0') { | |
334 | ret_parse = SR_ERR_ARG; | |
335 | break; | |
336 | } | |
337 | if (write_hdl) | |
338 | *write_hdl = parm_val; | |
339 | continue; | |
340 | } | |
341 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_HDL_CCCD)) { | |
342 | field += strlen(SER_BT_PARAM_PREFIX_HDL_CCCD); | |
343 | endp = NULL; | |
344 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
345 | if (ret != SR_OK || !endp || *endp != '\0') { | |
346 | ret_parse = SR_ERR_ARG; | |
347 | break; | |
348 | } | |
349 | if (cccd_hdl) | |
350 | *cccd_hdl = parm_val; | |
351 | continue; | |
352 | } | |
353 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_VAL_CCCD)) { | |
354 | field += strlen(SER_BT_PARAM_PREFIX_VAL_CCCD); | |
355 | endp = NULL; | |
356 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
357 | if (ret != SR_OK || !endp || *endp != '\0') { | |
358 | ret_parse = SR_ERR_ARG; | |
359 | break; | |
360 | } | |
361 | if (cccd_val) | |
362 | *cccd_val = parm_val; | |
363 | continue; | |
364 | } | |
365 | return SR_ERR_DATA; | |
366 | } | |
b79c3422 GS |
367 | |
368 | g_strfreev(fields); | |
0e4a85a9 | 369 | return ret_parse; |
b79c3422 GS |
370 | } |
371 | ||
372 | static void ser_bt_mask_databits(struct sr_serial_dev_inst *serial, | |
373 | uint8_t *data, size_t len) | |
374 | { | |
375 | uint32_t mask32; | |
376 | uint8_t mask; | |
377 | size_t idx; | |
378 | ||
379 | if ((serial->comm_params.data_bits % 8) == 0) | |
380 | return; | |
381 | ||
382 | mask32 = (1UL << serial->comm_params.data_bits) - 1; | |
383 | mask = mask32 & 0xff; | |
384 | for (idx = 0; idx < len; idx++) | |
385 | data[idx] &= mask; | |
386 | } | |
387 | ||
388 | static int ser_bt_data_cb(void *cb_data, uint8_t *data, size_t dlen) | |
389 | { | |
390 | struct sr_serial_dev_inst *serial; | |
391 | ||
392 | serial = cb_data; | |
393 | if (!serial) | |
394 | return -1; | |
395 | ||
396 | ser_bt_mask_databits(serial, data, dlen); | |
397 | sr_ser_queue_rx_data(serial, data, dlen); | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | /* }}} */ | |
403 | /* {{{ wrap serial-over-BT operations in a common serial.c API */ | |
404 | ||
405 | /* See if a serial port's name refers to a BT type. */ | |
406 | SR_PRIV int ser_name_is_bt(struct sr_serial_dev_inst *serial) | |
407 | { | |
408 | size_t off; | |
409 | char sep; | |
410 | ||
411 | if (!serial) | |
412 | return 0; | |
413 | if (!serial->port || !*serial->port) | |
414 | return 0; | |
415 | ||
416 | /* Accept either "bt" alone, or "bt/" as a prefix. */ | |
417 | if (!g_str_has_prefix(serial->port, SER_BT_CONN_PREFIX)) | |
418 | return 0; | |
419 | off = strlen(SER_BT_CONN_PREFIX); | |
420 | sep = serial->port[off]; | |
421 | if (sep != '\0' && sep != '/') | |
422 | return 0; | |
423 | ||
424 | return 1; | |
425 | } | |
426 | ||
427 | /* The open() wrapper for BT ports. */ | |
428 | static int ser_bt_open(struct sr_serial_dev_inst *serial, int flags) | |
429 | { | |
430 | enum ser_bt_conn_t conn_type; | |
431 | const char *remote_addr; | |
432 | size_t rfcomm_channel; | |
433 | uint16_t read_hdl, write_hdl, cccd_hdl, cccd_val; | |
434 | int rc; | |
435 | struct sr_bt_desc *desc; | |
436 | ||
437 | (void)flags; | |
438 | ||
439 | /* Derive BT specific parameters from the port spec. */ | |
440 | rc = ser_bt_parse_conn_spec(serial, serial->port, | |
441 | &conn_type, &remote_addr, | |
442 | &rfcomm_channel, | |
443 | &read_hdl, &write_hdl, | |
444 | &cccd_hdl, &cccd_val); | |
445 | if (rc != SR_OK) | |
446 | return SR_ERR_ARG; | |
447 | ||
448 | if (!conn_type || !remote_addr || !remote_addr[0]) { | |
449 | /* TODO Auto-search for available connections? */ | |
450 | return SR_ERR_NA; | |
451 | } | |
452 | ||
453 | /* Create the connection. Only store params after successful use. */ | |
454 | desc = sr_bt_desc_new(); | |
455 | if (!desc) | |
456 | return SR_ERR; | |
457 | serial->bt_desc = desc; | |
458 | rc = sr_bt_config_addr_remote(desc, remote_addr); | |
459 | if (rc < 0) | |
460 | return SR_ERR; | |
461 | serial->bt_addr_remote = g_strdup(remote_addr); | |
462 | switch (conn_type) { | |
463 | case SER_BT_CONN_RFCOMM: | |
464 | rc = sr_bt_config_rfcomm(desc, rfcomm_channel); | |
465 | if (rc < 0) | |
466 | return SR_ERR; | |
467 | serial->bt_rfcomm_channel = rfcomm_channel; | |
468 | break; | |
469 | case SER_BT_CONN_BLE122: | |
470 | case SER_BT_CONN_NRF51: | |
471 | case SER_BT_CONN_CC254x: | |
472 | rc = sr_bt_config_notify(desc, | |
473 | read_hdl, write_hdl, cccd_hdl, cccd_val); | |
474 | if (rc < 0) | |
475 | return SR_ERR; | |
476 | serial->bt_notify_handle_read = read_hdl; | |
477 | serial->bt_notify_handle_write = write_hdl; | |
478 | serial->bt_notify_handle_cccd = cccd_hdl; | |
479 | serial->bt_notify_value_cccd = cccd_val; | |
480 | break; | |
481 | default: | |
482 | /* Unsupported type, or incomplete implementation. */ | |
483 | return SR_ERR_ARG; | |
484 | } | |
485 | serial->bt_conn_type = conn_type; | |
486 | ||
487 | /* Make sure the receive buffer can accept input data. */ | |
488 | if (!serial->rcv_buffer) | |
489 | serial->rcv_buffer = g_string_sized_new(SER_BT_CHUNK_SIZE); | |
490 | rc = sr_bt_config_cb_data(desc, ser_bt_data_cb, serial); | |
491 | if (rc < 0) | |
492 | return SR_ERR; | |
493 | ||
494 | /* Open the connection. */ | |
495 | switch (conn_type) { | |
496 | case SER_BT_CONN_RFCOMM: | |
497 | rc = sr_bt_connect_rfcomm(desc); | |
498 | if (rc < 0) | |
499 | return SR_ERR; | |
500 | break; | |
501 | case SER_BT_CONN_BLE122: | |
502 | case SER_BT_CONN_NRF51: | |
503 | case SER_BT_CONN_CC254x: | |
504 | rc = sr_bt_connect_ble(desc); | |
505 | if (rc < 0) | |
506 | return SR_ERR; | |
507 | rc = sr_bt_start_notify(desc); | |
508 | if (rc < 0) | |
509 | return SR_ERR; | |
510 | break; | |
511 | default: | |
512 | return SR_ERR_ARG; | |
513 | } | |
514 | ||
515 | return SR_OK; | |
516 | } | |
517 | ||
518 | static int ser_bt_close(struct sr_serial_dev_inst *serial) | |
519 | { | |
520 | if (!serial) | |
521 | return SR_ERR_ARG; | |
522 | ||
523 | if (!serial->bt_desc) | |
524 | return SR_OK; | |
525 | ||
526 | sr_bt_disconnect(serial->bt_desc); | |
527 | sr_bt_desc_free(serial->bt_desc); | |
528 | serial->bt_desc = NULL; | |
529 | ||
530 | g_free(serial->bt_addr_local); | |
531 | serial->bt_addr_local = NULL; | |
532 | g_free(serial->bt_addr_remote); | |
533 | serial->bt_addr_remote = NULL; | |
534 | g_slist_free_full(serial->bt_source_args, g_free); | |
535 | serial->bt_source_args = NULL; | |
536 | ||
537 | return SR_OK; | |
538 | } | |
539 | ||
540 | /* Flush, discards pending RX data, empties buffers. */ | |
541 | static int ser_bt_flush(struct sr_serial_dev_inst *serial) | |
542 | { | |
543 | (void)serial; | |
544 | /* EMPTY */ | |
545 | ||
546 | return SR_OK; | |
547 | } | |
548 | ||
549 | /* Drain, waits for completion of pending TX data. */ | |
550 | static int ser_bt_drain(struct sr_serial_dev_inst *serial) | |
551 | { | |
552 | (void)serial; | |
553 | /* EMPTY */ /* TODO? */ | |
554 | ||
555 | return SR_ERR_BUG; | |
556 | } | |
557 | ||
558 | static int ser_bt_write(struct sr_serial_dev_inst *serial, | |
559 | const void *buf, size_t count, | |
560 | int nonblocking, unsigned int timeout_ms) | |
561 | { | |
562 | ssize_t wrlen; | |
563 | ||
564 | /* | |
565 | * TODO Support chunked transmission when callers' requests | |
566 | * exceed the BT channel's capacity? See ser_hid_write(). | |
567 | */ | |
568 | ||
569 | switch (serial->bt_conn_type) { | |
570 | case SER_BT_CONN_RFCOMM: | |
571 | (void)nonblocking; | |
572 | (void)timeout_ms; | |
573 | wrlen = sr_bt_write(serial->bt_desc, buf, count); | |
574 | if (wrlen < 0) | |
575 | return SR_ERR_IO; | |
576 | return wrlen; | |
577 | case SER_BT_CONN_BLE122: | |
578 | case SER_BT_CONN_NRF51: | |
579 | case SER_BT_CONN_CC254x: | |
580 | /* | |
581 | * Assume that when applications call the serial layer's | |
582 | * write routine, then the BLE chip/module does support | |
583 | * a TX handle. Just call the serial-BT library's write | |
584 | * routine. | |
585 | */ | |
586 | (void)nonblocking; | |
587 | (void)timeout_ms; | |
588 | wrlen = sr_bt_write(serial->bt_desc, buf, count); | |
589 | if (wrlen < 0) | |
590 | return SR_ERR_IO; | |
591 | return wrlen; | |
592 | default: | |
593 | return SR_ERR_ARG; | |
594 | } | |
595 | /* UNREACH */ | |
596 | } | |
597 | ||
598 | static int ser_bt_read(struct sr_serial_dev_inst *serial, | |
599 | void *buf, size_t count, | |
600 | int nonblocking, unsigned int timeout_ms) | |
601 | { | |
602 | gint64 deadline_us, now_us; | |
603 | uint8_t buffer[SER_BT_CHUNK_SIZE]; | |
604 | ssize_t rdlen; | |
605 | int rc; | |
606 | size_t dlen; | |
607 | ||
608 | /* | |
609 | * Immediately satisfy the caller's request from the RX buffer | |
610 | * if the requested amount of data is available already. | |
611 | */ | |
bf6b9e7b UH |
612 | if (sr_ser_has_queued_data(serial) >= count) |
613 | return sr_ser_unqueue_rx_data(serial, buf, count); | |
b79c3422 GS |
614 | |
615 | /* | |
616 | * When a timeout was specified, then determine the deadline | |
617 | * where to stop reception. | |
618 | */ | |
619 | deadline_us = 0; | |
b79c3422 GS |
620 | if (timeout_ms) { |
621 | now_us = g_get_monotonic_time(); | |
622 | deadline_us = now_us + timeout_ms * 1000; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Keep receiving from the port until the caller's requested | |
627 | * amount of data has become available, or the timeout has | |
628 | * expired. In the absence of a timeout, stop reading when an | |
629 | * attempt no longer yields receive data. | |
630 | */ | |
631 | while (TRUE) { | |
632 | /* Run another attempt to receive data. */ | |
633 | switch (serial->bt_conn_type) { | |
634 | case SER_BT_CONN_RFCOMM: | |
635 | rdlen = sr_bt_read(serial->bt_desc, buffer, sizeof(buffer)); | |
636 | if (rdlen <= 0) | |
637 | break; | |
638 | rc = ser_bt_data_cb(serial, buffer, rdlen); | |
639 | if (rc < 0) | |
640 | rdlen = -1; | |
641 | break; | |
642 | case SER_BT_CONN_BLE122: | |
643 | case SER_BT_CONN_NRF51: | |
644 | case SER_BT_CONN_CC254x: | |
645 | dlen = sr_ser_has_queued_data(serial); | |
646 | rc = sr_bt_check_notify(serial->bt_desc); | |
647 | if (rc < 0) | |
648 | rdlen = -1; | |
649 | else if (sr_ser_has_queued_data(serial) != dlen) | |
650 | rdlen = +1; | |
651 | else | |
652 | rdlen = 0; | |
653 | break; | |
654 | default: | |
655 | rdlen = -1; | |
656 | break; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Stop upon receive errors, or timeout expiration. Only | |
661 | * stop upon empty reception in the absence of a timeout. | |
662 | */ | |
663 | if (rdlen < 0) | |
664 | break; | |
665 | if (nonblocking && !rdlen) | |
666 | break; | |
667 | if (deadline_us) { | |
668 | now_us = g_get_monotonic_time(); | |
669 | if (now_us > deadline_us) | |
670 | break; | |
671 | } | |
672 | ||
673 | /* Also stop when sufficient data has become available. */ | |
674 | if (sr_ser_has_queued_data(serial) >= count) | |
675 | break; | |
676 | } | |
677 | ||
678 | /* | |
679 | * Satisfy the caller's demand for receive data from previously | |
680 | * queued incoming data. | |
681 | */ | |
682 | dlen = sr_ser_has_queued_data(serial); | |
683 | if (dlen > count) | |
684 | dlen = count; | |
685 | if (!dlen) | |
686 | return 0; | |
687 | ||
688 | return sr_ser_unqueue_rx_data(serial, buf, dlen); | |
689 | } | |
690 | ||
b79c3422 GS |
691 | struct bt_source_args_t { |
692 | /* The application callback. */ | |
693 | sr_receive_data_callback cb; | |
694 | void *cb_data; | |
695 | /* The serial device, to store RX data. */ | |
696 | struct sr_serial_dev_inst *serial; | |
697 | }; | |
698 | ||
699 | /* | |
700 | * Gets periodically invoked by the glib main loop. "Drives" (checks) | |
701 | * progress of BT communication, and invokes the application's callback | |
702 | * which processes RX data (when some has become available), as well as | |
703 | * handles application level timeouts. | |
704 | */ | |
705 | static int bt_source_cb(int fd, int revents, void *cb_data) | |
706 | { | |
707 | struct bt_source_args_t *args; | |
708 | struct sr_serial_dev_inst *serial; | |
709 | uint8_t rx_buf[SER_BT_CHUNK_SIZE]; | |
710 | ssize_t rdlen; | |
711 | size_t dlen; | |
712 | int rc; | |
713 | ||
714 | args = cb_data; | |
715 | if (!args) | |
716 | return -1; | |
717 | serial = args->serial; | |
718 | if (!serial) | |
719 | return -1; | |
720 | if (!serial->bt_conn_type) | |
721 | return -1; | |
722 | ||
723 | /* | |
724 | * Drain receive data which the channel might have pending. | |
725 | * This is "a copy" of the "background part" of ser_bt_read(), | |
726 | * without the timeout support code, and not knowing how much | |
727 | * data the application is expecting. | |
728 | */ | |
729 | do { | |
730 | switch (serial->bt_conn_type) { | |
731 | case SER_BT_CONN_RFCOMM: | |
732 | rdlen = sr_bt_read(serial->bt_desc, rx_buf, sizeof(rx_buf)); | |
733 | if (rdlen <= 0) | |
734 | break; | |
735 | rc = ser_bt_data_cb(serial, rx_buf, rdlen); | |
736 | if (rc < 0) | |
737 | rdlen = -1; | |
738 | break; | |
739 | case SER_BT_CONN_BLE122: | |
740 | case SER_BT_CONN_NRF51: | |
741 | case SER_BT_CONN_CC254x: | |
742 | dlen = sr_ser_has_queued_data(serial); | |
743 | rc = sr_bt_check_notify(serial->bt_desc); | |
744 | if (rc < 0) | |
745 | rdlen = -1; | |
746 | else if (sr_ser_has_queued_data(serial) != dlen) | |
747 | rdlen = +1; | |
748 | else | |
749 | rdlen = 0; | |
750 | break; | |
751 | default: | |
752 | rdlen = -1; | |
753 | break; | |
754 | } | |
755 | } while (rdlen > 0); | |
756 | ||
757 | /* | |
758 | * When RX data became available (now or earlier), pass this | |
759 | * condition to the application callback. Always periodically | |
760 | * run the application callback, since it handles timeouts and | |
761 | * might carry out other tasks as well like signalling progress. | |
762 | */ | |
763 | if (sr_ser_has_queued_data(args->serial)) | |
764 | revents |= G_IO_IN; | |
765 | rc = args->cb(fd, revents, args->cb_data); | |
766 | ||
767 | return rc; | |
768 | } | |
769 | ||
770 | /* TODO Can we use the Bluetooth socket's file descriptor? Probably not portably. */ | |
771 | #define WITH_MAXIMUM_TIMEOUT_VALUE 0 | |
772 | static int ser_bt_setup_source_add(struct sr_session *session, | |
773 | struct sr_serial_dev_inst *serial, | |
774 | int events, int timeout, | |
775 | sr_receive_data_callback cb, void *cb_data) | |
776 | { | |
777 | struct bt_source_args_t *args; | |
778 | int rc; | |
779 | ||
780 | (void)events; | |
781 | ||
782 | /* Optionally enforce a minimum poll period. */ | |
783 | if (WITH_MAXIMUM_TIMEOUT_VALUE && timeout > WITH_MAXIMUM_TIMEOUT_VALUE) | |
784 | timeout = WITH_MAXIMUM_TIMEOUT_VALUE; | |
785 | ||
786 | /* Allocate status container for background data reception. */ | |
787 | args = g_malloc0(sizeof(*args)); | |
788 | args->cb = cb; | |
789 | args->cb_data = cb_data; | |
790 | args->serial = serial; | |
791 | ||
792 | /* | |
793 | * Have a periodic timer installed. Register the allocated block | |
794 | * with the serial device, since the GSource's finalizer won't | |
795 | * free the memory, and we haven't bothered to create a custom | |
796 | * BT specific GSource. | |
797 | */ | |
798 | rc = sr_session_source_add(session, -1, events, timeout, bt_source_cb, args); | |
799 | if (rc != SR_OK) { | |
800 | g_free(args); | |
801 | return rc; | |
802 | } | |
803 | serial->bt_source_args = g_slist_append(serial->bt_source_args, args); | |
804 | ||
805 | return SR_OK; | |
806 | } | |
807 | ||
808 | static int ser_bt_setup_source_remove(struct sr_session *session, | |
809 | struct sr_serial_dev_inst *serial) | |
810 | { | |
811 | (void)serial; | |
812 | ||
813 | (void)sr_session_source_remove(session, -1); | |
814 | /* Release callback args here already? */ | |
815 | ||
816 | return SR_OK; | |
817 | } | |
818 | ||
b79c3422 GS |
819 | struct bt_scan_args_t { |
820 | GSList *port_list; | |
821 | sr_ser_list_append_t append; | |
822 | GSList *addr_list; | |
823 | const char *bt_type; | |
824 | }; | |
825 | ||
826 | static void scan_cb(void *cb_args, const char *addr, const char *name) | |
827 | { | |
828 | struct bt_scan_args_t *scan_args; | |
829 | GSList *l; | |
830 | char addr_text[20]; | |
c622c88c | 831 | const struct scan_supported_item *item; |
b79c3422 GS |
832 | enum ser_bt_conn_t type; |
833 | char *port_name, *port_desc; | |
834 | char *addr_copy; | |
835 | ||
836 | scan_args = cb_args; | |
837 | if (!scan_args) | |
838 | return; | |
839 | sr_info("BT scan, found: %s - %s\n", addr, name); | |
840 | ||
841 | /* Check whether the device was seen before. */ | |
842 | for (l = scan_args->addr_list; l; l = l->next) { | |
bf6b9e7b | 843 | if (strcmp(addr, l->data) == 0) |
b79c3422 | 844 | return; |
b79c3422 GS |
845 | } |
846 | ||
847 | /* Substitute colons in the address by dashes. */ | |
848 | if (!addr || !*addr) | |
849 | return; | |
850 | snprintf(addr_text, sizeof(addr_text), "%s", addr); | |
851 | g_strcanon(addr_text, "0123456789abcdefABCDEF", '-'); | |
852 | ||
853 | /* Create a port name, and a description. */ | |
c622c88c GS |
854 | item = scan_is_supported(name); |
855 | type = item ? item->type : SER_BT_CONN_UNKNOWN; | |
856 | port_name = g_strdup_printf("%s/%s/%s%s", | |
857 | SER_BT_CONN_PREFIX, conn_name_text(type), addr_text, | |
858 | (item && item->add_params) ? item->add_params : ""); | |
b79c3422 GS |
859 | port_desc = g_strdup_printf("%s (%s)", name, scan_args->bt_type); |
860 | ||
861 | scan_args->port_list = scan_args->append(scan_args->port_list, port_name, port_desc); | |
862 | g_free(port_name); | |
863 | g_free(port_desc); | |
864 | ||
865 | /* Keep track of the handled address. */ | |
866 | addr_copy = g_strdup(addr); | |
867 | scan_args->addr_list = g_slist_append(scan_args->addr_list, addr_copy); | |
868 | } | |
869 | ||
870 | static GSList *ser_bt_list(GSList *list, sr_ser_list_append_t append) | |
871 | { | |
a1b80f9d | 872 | static const int scan_duration = 3; |
b79c3422 GS |
873 | |
874 | struct bt_scan_args_t scan_args; | |
875 | struct sr_bt_desc *desc; | |
876 | ||
877 | /* | |
878 | * Implementor's note: This "list" routine is best-effort. We | |
879 | * assume that registering callbacks always succeeds. Silently | |
880 | * ignore failure to scan for devices. Just return those which | |
881 | * we happen to find. | |
882 | */ | |
883 | ||
884 | desc = sr_bt_desc_new(); | |
885 | if (!desc) | |
886 | return list; | |
887 | ||
888 | memset(&scan_args, 0, sizeof(scan_args)); | |
889 | scan_args.port_list = list; | |
890 | scan_args.append = append; | |
891 | ||
892 | scan_args.addr_list = NULL; | |
893 | scan_args.bt_type = "BT"; | |
894 | (void)sr_bt_config_cb_scan(desc, scan_cb, &scan_args); | |
895 | (void)sr_bt_scan_bt(desc, scan_duration); | |
896 | g_slist_free_full(scan_args.addr_list, g_free); | |
897 | ||
898 | scan_args.addr_list = NULL; | |
899 | scan_args.bt_type = "BLE"; | |
900 | (void)sr_bt_config_cb_scan(desc, scan_cb, &scan_args); | |
901 | (void)sr_bt_scan_le(desc, scan_duration); | |
902 | g_slist_free_full(scan_args.addr_list, g_free); | |
903 | ||
904 | sr_bt_desc_free(desc); | |
905 | ||
906 | return scan_args.port_list; | |
907 | } | |
908 | ||
909 | static struct ser_lib_functions serlib_bt = { | |
910 | .open = ser_bt_open, | |
911 | .close = ser_bt_close, | |
912 | .flush = ser_bt_flush, | |
913 | .drain = ser_bt_drain, | |
914 | .write = ser_bt_write, | |
915 | .read = ser_bt_read, | |
c0aa074e UH |
916 | /* |
917 | * Bluetooth communication has no concept of bitrate, so ignore | |
918 | * these arguments silently. Neither need we pass the frame format | |
919 | * down to internal BT comm routines, nor need we keep the values | |
920 | * here, since the caller will cache/register them already. | |
921 | */ | |
922 | .set_params = std_dummy_set_params, | |
3ad30b4e | 923 | .set_handshake = std_dummy_set_handshake, |
b79c3422 GS |
924 | .setup_source_add = ser_bt_setup_source_add, |
925 | .setup_source_remove = ser_bt_setup_source_remove, | |
926 | .list = ser_bt_list, | |
927 | .get_frame_format = NULL, | |
928 | }; | |
929 | SR_PRIV struct ser_lib_functions *ser_lib_funcs_bt = &serlib_bt; | |
930 | ||
931 | /* }}} */ | |
932 | #else | |
933 | ||
934 | SR_PRIV int ser_name_is_bt(struct sr_serial_dev_inst *serial) | |
935 | { | |
936 | (void)serial; | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
941 | SR_PRIV struct ser_lib_functions *ser_lib_funcs_bt = NULL; | |
942 | ||
943 | #endif | |
944 | #endif | |
945 | ||
946 | /** @} */ |