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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=" | |
25d7c995 | 40 | #define SER_BT_PARAM_PREFIX_BLE_MTU "mtu=" |
0e4a85a9 | 41 | |
b79c3422 GS |
42 | /** |
43 | * @file | |
44 | * | |
45 | * Serial port handling, wraps the external BT/BLE dependencies. | |
46 | */ | |
47 | ||
48 | /** | |
49 | * @defgroup grp_serial_bt Serial port handling, BT/BLE group | |
50 | * | |
51 | * Make serial-over-BT communication appear like a regular serial port. | |
52 | * | |
53 | * @{ | |
54 | */ | |
55 | ||
56 | /* {{{ support for serial-over-BT channels */ | |
57 | ||
ca98f7ae GS |
58 | /* |
59 | * This builtin database of known devices (keyed by their names as | |
60 | * provided during BT/BLE scans) can help improve the presentation of | |
61 | * scan results. Ideally users could take the output and pass it to | |
62 | * subsequent program invocations, not having to "come up with" the | |
63 | * conn= spec, or only having to touch it up minimally. GUI dialogs | |
64 | * could present scan results such that users just need to pick an | |
65 | * item to open a connection. | |
66 | * | |
67 | * The current implementation guesses connection types from device | |
68 | * names, and optionally amends them with additional parameters if | |
69 | * experience shows that individual devices need these extra specs. | |
70 | * | |
71 | * This database may have to move to a separate source file should | |
72 | * its size grow to amounts that are considered inappropriate here | |
73 | * in the serial transport's BT dispatcher. For now the item count | |
74 | * is small. | |
75 | */ | |
76 | ||
b79c3422 GS |
77 | static const struct scan_supported_item { |
78 | const char *name; | |
79 | enum ser_bt_conn_t type; | |
c622c88c | 80 | const char *add_params; |
b79c3422 | 81 | } scan_supported_items[] = { |
c622c88c GS |
82 | { "121GW", SER_BT_CONN_BLE122, NULL, }, |
83 | { "Adafruit Bluefruit LE 8134", SER_BT_CONN_NRF51, NULL, }, | |
d0a73799 GS |
84 | { "DL24M_BLE", SER_BT_CONN_AC6328, NULL, }, |
85 | { "DL24M_SPP", SER_BT_CONN_RFCOMM, "/channel=2", }, | |
c622c88c | 86 | { "HC-05", SER_BT_CONN_RFCOMM, NULL, }, |
d0a73799 GS |
87 | { "UC96_BLE", SER_BT_CONN_AC6328, NULL, }, |
88 | { "UC96_SPP", SER_BT_CONN_RFCOMM, "/channel=2", }, | |
c622c88c GS |
89 | { "UM25C", SER_BT_CONN_RFCOMM, NULL, }, |
90 | { NULL, SER_BT_CONN_UNKNOWN, NULL, }, | |
b79c3422 GS |
91 | }; |
92 | ||
ca98f7ae GS |
93 | static const struct scan_supported_item *scan_is_supported(const char *name) |
94 | { | |
95 | size_t idx; | |
96 | const struct scan_supported_item *item; | |
97 | ||
98 | for (idx = 0; idx < ARRAY_SIZE(scan_supported_items); idx++) { | |
99 | item = &scan_supported_items[idx]; | |
100 | if (!item->name) | |
101 | break; | |
102 | if (strcmp(name, item->name) != 0) | |
103 | continue; | |
104 | return item; | |
105 | } | |
106 | ||
107 | return NULL; | |
108 | } | |
109 | ||
b79c3422 GS |
110 | static const char *ser_bt_conn_names[SER_BT_CONN_MAX] = { |
111 | [SER_BT_CONN_UNKNOWN] = "<type>", | |
112 | [SER_BT_CONN_RFCOMM] = "rfcomm", | |
113 | [SER_BT_CONN_BLE122] = "ble122", | |
114 | [SER_BT_CONN_NRF51] = "nrf51", | |
115 | [SER_BT_CONN_CC254x] = "cc254x", | |
d0a73799 | 116 | [SER_BT_CONN_AC6328] = "ac6328", |
dae34e30 | 117 | [SER_BT_CONN_NOTIFY] = "notify", |
b79c3422 GS |
118 | }; |
119 | ||
120 | static enum ser_bt_conn_t lookup_conn_name(const char *name) | |
121 | { | |
122 | size_t idx; | |
123 | const char *item; | |
124 | ||
125 | if (!name || !*name) | |
126 | return SER_BT_CONN_UNKNOWN; | |
127 | idx = ARRAY_SIZE(ser_bt_conn_names); | |
128 | while (idx-- > 0) { | |
129 | item = ser_bt_conn_names[idx]; | |
130 | if (strcmp(item, name) == 0) | |
131 | return idx; | |
132 | } | |
133 | ||
134 | return SER_BT_CONN_UNKNOWN; | |
135 | } | |
136 | ||
137 | static const char *conn_name_text(enum ser_bt_conn_t type) | |
138 | { | |
139 | if (type >= ARRAY_SIZE(ser_bt_conn_names)) | |
140 | type = SER_BT_CONN_UNKNOWN; | |
141 | ||
142 | return ser_bt_conn_names[type]; | |
143 | } | |
144 | ||
145 | /** | |
146 | * Parse conn= specs for serial over Bluetooth communication. | |
147 | * | |
148 | * @param[in] serial The serial port that is about to get opened. | |
149 | * @param[in] spec The caller provided conn= specification. | |
150 | * @param[out] conn_type The type of BT comm (BT RFCOMM, BLE notify). | |
151 | * @param[out] remote_addr The remote device address. | |
152 | * @param[out] rfcomm_channel The RFCOMM channel (if applicable). | |
153 | * @param[out] read_hdl The BLE notify read handle (if applicable). | |
154 | * @param[out] write_hdl The BLE notify write handle (if applicable). | |
155 | * @param[out] cccd_hdl The BLE notify CCCD handle (if applicable). | |
156 | * @param[out] cccd_val The BLE notify CCCD value (if applicable). | |
157 | * | |
158 | * @return 0 upon success, non-zero upon failure. | |
159 | * | |
b79c3422 GS |
160 | * Summary of parsing rules as they are implemented: |
161 | * - Implementor's note: Automatic scan for available devices is not | |
162 | * yet implemented. So strictly speaking some parts of the input | |
163 | * spec are optional, but fallbacks may not take effect ATM. | |
164 | * - Insist on the "bt" prefix. Accept "bt" alone without any other | |
165 | * additional field. | |
166 | * - The first field that follows is the connection type. Supported | |
167 | * types are 'rfcomm', 'ble122', 'cc254x', and potentially others | |
168 | * in a future implementation. | |
169 | * - The next field is the remote device's address, either separated | |
170 | * by colons or dashes or spaces, or not separated at all. | |
171 | * - Other parameters (RFCOMM channel, notify handles and write values) | |
ee617d62 GS |
172 | * get derived from the connection type. |
173 | * - More fields after the remote address are options which override | |
174 | * builtin defaults (RFCOMM channels, BLE handles, etc). | |
b79c3422 GS |
175 | * |
176 | * Supported formats resulting from these rules: | |
ee617d62 | 177 | * bt/<conn>/<addr>[/<param>]... |
b79c3422 GS |
178 | * |
179 | * Examples: | |
180 | * bt/rfcomm/11-22-33-44-55-66 | |
ee617d62 | 181 | * bt/rfcomm/11-22-33-44-55-66/channel=2 |
b79c3422 GS |
182 | * bt/ble122/88:6b:12:34:56:78 |
183 | * bt/cc254x/0123456789ab | |
184 | * | |
185 | * It's assumed that users easily can create those conn= specs from | |
186 | * available information, or that scan routines will create such specs | |
187 | * that copy'n'paste results (or GUI choices from previous scan results) | |
188 | * can get processed here. | |
189 | */ | |
190 | static int ser_bt_parse_conn_spec( | |
191 | struct sr_serial_dev_inst *serial, const char *spec, | |
192 | enum ser_bt_conn_t *conn_type, const char **remote_addr, | |
193 | size_t *rfcomm_channel, | |
194 | uint16_t *read_hdl, uint16_t *write_hdl, | |
25d7c995 GS |
195 | uint16_t *cccd_hdl, uint16_t *cccd_val, |
196 | uint16_t *ble_mtu) | |
b79c3422 | 197 | { |
819277b5 | 198 | char **fields, *field; |
b79c3422 GS |
199 | enum ser_bt_conn_t type; |
200 | const char *addr; | |
0e4a85a9 GS |
201 | int ret_parse, ret; |
202 | size_t fields_count, field_idx; | |
203 | char *endp; | |
204 | unsigned long parm_val; | |
b79c3422 GS |
205 | |
206 | if (conn_type) | |
207 | *conn_type = SER_BT_CONN_UNKNOWN; | |
208 | if (remote_addr) | |
209 | *remote_addr = NULL; | |
210 | if (rfcomm_channel) | |
211 | *rfcomm_channel = 0; | |
212 | if (read_hdl) | |
213 | *read_hdl = 0; | |
214 | if (write_hdl) | |
215 | *write_hdl = 0; | |
216 | if (cccd_hdl) | |
217 | *cccd_hdl = 0; | |
218 | if (cccd_val) | |
219 | *cccd_val = 0; | |
25d7c995 GS |
220 | if (ble_mtu) |
221 | *ble_mtu = 0; | |
b79c3422 | 222 | |
b79c3422 GS |
223 | if (!serial || !spec || !spec[0]) |
224 | return SR_ERR_ARG; | |
225 | ||
226 | /* Evaluate the mandatory first three fields. */ | |
227 | fields = g_strsplit_set(spec, "/", 0); | |
228 | if (!fields) | |
229 | return SR_ERR_ARG; | |
230 | if (g_strv_length(fields) < 3) { | |
231 | g_strfreev(fields); | |
232 | return SR_ERR_ARG; | |
233 | } | |
234 | field = fields[0]; | |
235 | if (strcmp(field, SER_BT_CONN_PREFIX) != 0) { | |
236 | g_strfreev(fields); | |
237 | return SR_ERR_ARG; | |
238 | } | |
239 | field = fields[1]; | |
240 | type = lookup_conn_name(field); | |
241 | if (!type) { | |
242 | g_strfreev(fields); | |
243 | return SR_ERR_ARG; | |
244 | } | |
245 | if (conn_type) | |
246 | *conn_type = type; | |
247 | field = fields[2]; | |
248 | if (!field || !*field) { | |
249 | g_strfreev(fields); | |
250 | return SR_ERR_ARG; | |
251 | } | |
252 | addr = g_strdup(field); | |
253 | if (remote_addr) | |
254 | *remote_addr = addr; | |
255 | ||
256 | /* Derive default parameters that match the connection type. */ | |
257 | /* TODO Lookup defaults from a table? */ | |
258 | switch (type) { | |
259 | case SER_BT_CONN_RFCOMM: | |
260 | if (rfcomm_channel) | |
261 | *rfcomm_channel = 1; | |
262 | break; | |
263 | case SER_BT_CONN_BLE122: | |
264 | if (read_hdl) | |
265 | *read_hdl = 8; | |
266 | if (write_hdl) | |
267 | *write_hdl = 0; | |
268 | if (cccd_hdl) | |
269 | *cccd_hdl = 9; | |
270 | if (cccd_val) | |
271 | *cccd_val = 0x0003; | |
272 | break; | |
273 | case SER_BT_CONN_NRF51: | |
274 | /* TODO | |
275 | * Are these values appropriate? Check the learn article at | |
276 | * https://learn.adafruit.com/introducing-the-adafruit-bluefruit-le-uart-friend?view=all | |
277 | */ | |
278 | if (read_hdl) | |
279 | *read_hdl = 13; | |
280 | if (write_hdl) | |
281 | *write_hdl = 11; | |
282 | if (cccd_hdl) | |
283 | *cccd_hdl = 14; | |
284 | if (cccd_val) | |
285 | *cccd_val = 0x0001; | |
286 | /* TODO 'random' type, sec-level=high */ | |
287 | break; | |
288 | case SER_BT_CONN_CC254x: | |
289 | /* TODO Are these values appropriate? Just guessing here. */ | |
290 | if (read_hdl) | |
291 | *read_hdl = 20; | |
292 | if (write_hdl) | |
293 | *write_hdl = 0; | |
294 | if (cccd_hdl) | |
295 | *cccd_hdl = 21; | |
296 | if (cccd_val) | |
297 | *cccd_val = 0x0001; | |
298 | break; | |
d0a73799 GS |
299 | case SER_BT_CONN_AC6328: |
300 | if (read_hdl) | |
301 | *read_hdl = 12; | |
302 | if (write_hdl) | |
303 | *write_hdl = 15; | |
304 | if (cccd_hdl) | |
305 | *cccd_hdl = 13; | |
306 | if (cccd_val) | |
307 | *cccd_val = 0x0001; | |
308 | break; | |
dae34e30 GS |
309 | case SER_BT_CONN_NOTIFY: |
310 | /* All other values must be provided externally. */ | |
311 | if (cccd_val) | |
312 | *cccd_val = 0x0001; | |
313 | break; | |
b79c3422 GS |
314 | default: |
315 | return SR_ERR_ARG; | |
316 | } | |
317 | ||
0e4a85a9 GS |
318 | /* |
319 | * Preset a successful return value for the conn= parse call. | |
320 | * Scan optional additional fields which specify more params. | |
321 | * Update the defaults which were setup above. Pessimize the | |
322 | * routine's return value in error paths. | |
323 | */ | |
324 | ret_parse = SR_OK; | |
325 | fields_count = g_strv_length(fields); | |
326 | for (field_idx = 3; field_idx < fields_count; field_idx++) { | |
327 | field = fields[field_idx]; | |
328 | if (!field || !*field) | |
329 | continue; | |
330 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_CHANNEL)) { | |
331 | field += strlen(SER_BT_PARAM_PREFIX_CHANNEL); | |
332 | endp = NULL; | |
333 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
334 | if (ret != SR_OK || !endp || *endp != '\0') { | |
335 | ret_parse = SR_ERR_ARG; | |
336 | break; | |
337 | } | |
338 | if (rfcomm_channel) | |
339 | *rfcomm_channel = parm_val; | |
340 | continue; | |
341 | } | |
342 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_HDL_RX)) { | |
343 | field += strlen(SER_BT_PARAM_PREFIX_HDL_RX); | |
344 | endp = NULL; | |
345 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
346 | if (ret != SR_OK || !endp || *endp != '\0') { | |
347 | ret_parse = SR_ERR_ARG; | |
348 | break; | |
349 | } | |
350 | if (read_hdl) | |
351 | *read_hdl = parm_val; | |
352 | continue; | |
353 | } | |
354 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_HDL_TX)) { | |
355 | field += strlen(SER_BT_PARAM_PREFIX_HDL_TX); | |
356 | endp = NULL; | |
357 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
358 | if (ret != SR_OK || !endp || *endp != '\0') { | |
359 | ret_parse = SR_ERR_ARG; | |
360 | break; | |
361 | } | |
362 | if (write_hdl) | |
363 | *write_hdl = parm_val; | |
364 | continue; | |
365 | } | |
366 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_HDL_CCCD)) { | |
367 | field += strlen(SER_BT_PARAM_PREFIX_HDL_CCCD); | |
368 | endp = NULL; | |
369 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
370 | if (ret != SR_OK || !endp || *endp != '\0') { | |
371 | ret_parse = SR_ERR_ARG; | |
372 | break; | |
373 | } | |
374 | if (cccd_hdl) | |
375 | *cccd_hdl = parm_val; | |
376 | continue; | |
377 | } | |
378 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_VAL_CCCD)) { | |
379 | field += strlen(SER_BT_PARAM_PREFIX_VAL_CCCD); | |
380 | endp = NULL; | |
381 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
382 | if (ret != SR_OK || !endp || *endp != '\0') { | |
383 | ret_parse = SR_ERR_ARG; | |
384 | break; | |
385 | } | |
386 | if (cccd_val) | |
387 | *cccd_val = parm_val; | |
388 | continue; | |
389 | } | |
25d7c995 GS |
390 | if (g_str_has_prefix(field, SER_BT_PARAM_PREFIX_BLE_MTU)) { |
391 | field += strlen(SER_BT_PARAM_PREFIX_BLE_MTU); | |
392 | endp = NULL; | |
393 | ret = sr_atoul_base(field, &parm_val, &endp, 0); | |
394 | if (ret != SR_OK || !endp || *endp != '\0') { | |
395 | ret_parse = SR_ERR_ARG; | |
396 | break; | |
397 | } | |
398 | if (ble_mtu) | |
399 | *ble_mtu = parm_val; | |
400 | continue; | |
401 | } | |
0e4a85a9 GS |
402 | return SR_ERR_DATA; |
403 | } | |
b79c3422 GS |
404 | |
405 | g_strfreev(fields); | |
0e4a85a9 | 406 | return ret_parse; |
b79c3422 GS |
407 | } |
408 | ||
409 | static void ser_bt_mask_databits(struct sr_serial_dev_inst *serial, | |
410 | uint8_t *data, size_t len) | |
411 | { | |
412 | uint32_t mask32; | |
413 | uint8_t mask; | |
414 | size_t idx; | |
415 | ||
416 | if ((serial->comm_params.data_bits % 8) == 0) | |
417 | return; | |
418 | ||
419 | mask32 = (1UL << serial->comm_params.data_bits) - 1; | |
420 | mask = mask32 & 0xff; | |
421 | for (idx = 0; idx < len; idx++) | |
422 | data[idx] &= mask; | |
423 | } | |
424 | ||
425 | static int ser_bt_data_cb(void *cb_data, uint8_t *data, size_t dlen) | |
426 | { | |
427 | struct sr_serial_dev_inst *serial; | |
428 | ||
429 | serial = cb_data; | |
430 | if (!serial) | |
431 | return -1; | |
432 | ||
a8b0e6f5 GS |
433 | if (!data && dlen) |
434 | return -1; | |
435 | if (!data || !dlen) | |
436 | return 0; | |
437 | ||
b79c3422 GS |
438 | ser_bt_mask_databits(serial, data, dlen); |
439 | sr_ser_queue_rx_data(serial, data, dlen); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | /* }}} */ | |
445 | /* {{{ wrap serial-over-BT operations in a common serial.c API */ | |
446 | ||
447 | /* See if a serial port's name refers to a BT type. */ | |
448 | SR_PRIV int ser_name_is_bt(struct sr_serial_dev_inst *serial) | |
449 | { | |
450 | size_t off; | |
451 | char sep; | |
452 | ||
453 | if (!serial) | |
454 | return 0; | |
455 | if (!serial->port || !*serial->port) | |
456 | return 0; | |
457 | ||
458 | /* Accept either "bt" alone, or "bt/" as a prefix. */ | |
459 | if (!g_str_has_prefix(serial->port, SER_BT_CONN_PREFIX)) | |
460 | return 0; | |
461 | off = strlen(SER_BT_CONN_PREFIX); | |
462 | sep = serial->port[off]; | |
463 | if (sep != '\0' && sep != '/') | |
464 | return 0; | |
465 | ||
466 | return 1; | |
467 | } | |
468 | ||
469 | /* The open() wrapper for BT ports. */ | |
470 | static int ser_bt_open(struct sr_serial_dev_inst *serial, int flags) | |
471 | { | |
472 | enum ser_bt_conn_t conn_type; | |
473 | const char *remote_addr; | |
474 | size_t rfcomm_channel; | |
475 | uint16_t read_hdl, write_hdl, cccd_hdl, cccd_val; | |
25d7c995 | 476 | uint16_t ble_mtu; |
b79c3422 GS |
477 | int rc; |
478 | struct sr_bt_desc *desc; | |
479 | ||
480 | (void)flags; | |
481 | ||
482 | /* Derive BT specific parameters from the port spec. */ | |
483 | rc = ser_bt_parse_conn_spec(serial, serial->port, | |
484 | &conn_type, &remote_addr, | |
485 | &rfcomm_channel, | |
486 | &read_hdl, &write_hdl, | |
25d7c995 GS |
487 | &cccd_hdl, &cccd_val, |
488 | &ble_mtu); | |
b79c3422 GS |
489 | if (rc != SR_OK) |
490 | return SR_ERR_ARG; | |
491 | ||
492 | if (!conn_type || !remote_addr || !remote_addr[0]) { | |
493 | /* TODO Auto-search for available connections? */ | |
494 | return SR_ERR_NA; | |
495 | } | |
496 | ||
497 | /* Create the connection. Only store params after successful use. */ | |
498 | desc = sr_bt_desc_new(); | |
499 | if (!desc) | |
500 | return SR_ERR; | |
501 | serial->bt_desc = desc; | |
502 | rc = sr_bt_config_addr_remote(desc, remote_addr); | |
503 | if (rc < 0) | |
504 | return SR_ERR; | |
505 | serial->bt_addr_remote = g_strdup(remote_addr); | |
506 | switch (conn_type) { | |
507 | case SER_BT_CONN_RFCOMM: | |
508 | rc = sr_bt_config_rfcomm(desc, rfcomm_channel); | |
509 | if (rc < 0) | |
510 | return SR_ERR; | |
511 | serial->bt_rfcomm_channel = rfcomm_channel; | |
512 | break; | |
513 | case SER_BT_CONN_BLE122: | |
514 | case SER_BT_CONN_NRF51: | |
515 | case SER_BT_CONN_CC254x: | |
d0a73799 | 516 | case SER_BT_CONN_AC6328: |
dae34e30 | 517 | case SER_BT_CONN_NOTIFY: |
b79c3422 | 518 | rc = sr_bt_config_notify(desc, |
25d7c995 GS |
519 | read_hdl, write_hdl, cccd_hdl, cccd_val, |
520 | ble_mtu); | |
b79c3422 GS |
521 | if (rc < 0) |
522 | return SR_ERR; | |
523 | serial->bt_notify_handle_read = read_hdl; | |
524 | serial->bt_notify_handle_write = write_hdl; | |
525 | serial->bt_notify_handle_cccd = cccd_hdl; | |
526 | serial->bt_notify_value_cccd = cccd_val; | |
25d7c995 | 527 | serial->bt_ble_mtu = ble_mtu; |
b79c3422 GS |
528 | break; |
529 | default: | |
530 | /* Unsupported type, or incomplete implementation. */ | |
531 | return SR_ERR_ARG; | |
532 | } | |
533 | serial->bt_conn_type = conn_type; | |
534 | ||
535 | /* Make sure the receive buffer can accept input data. */ | |
536 | if (!serial->rcv_buffer) | |
537 | serial->rcv_buffer = g_string_sized_new(SER_BT_CHUNK_SIZE); | |
538 | rc = sr_bt_config_cb_data(desc, ser_bt_data_cb, serial); | |
539 | if (rc < 0) | |
540 | return SR_ERR; | |
541 | ||
542 | /* Open the connection. */ | |
543 | switch (conn_type) { | |
544 | case SER_BT_CONN_RFCOMM: | |
545 | rc = sr_bt_connect_rfcomm(desc); | |
546 | if (rc < 0) | |
547 | return SR_ERR; | |
548 | break; | |
549 | case SER_BT_CONN_BLE122: | |
550 | case SER_BT_CONN_NRF51: | |
551 | case SER_BT_CONN_CC254x: | |
d0a73799 | 552 | case SER_BT_CONN_AC6328: |
dae34e30 | 553 | case SER_BT_CONN_NOTIFY: |
b79c3422 GS |
554 | rc = sr_bt_connect_ble(desc); |
555 | if (rc < 0) | |
556 | return SR_ERR; | |
557 | rc = sr_bt_start_notify(desc); | |
558 | if (rc < 0) | |
559 | return SR_ERR; | |
560 | break; | |
561 | default: | |
562 | return SR_ERR_ARG; | |
563 | } | |
564 | ||
565 | return SR_OK; | |
566 | } | |
567 | ||
568 | static int ser_bt_close(struct sr_serial_dev_inst *serial) | |
569 | { | |
570 | if (!serial) | |
571 | return SR_ERR_ARG; | |
572 | ||
573 | if (!serial->bt_desc) | |
574 | return SR_OK; | |
575 | ||
576 | sr_bt_disconnect(serial->bt_desc); | |
577 | sr_bt_desc_free(serial->bt_desc); | |
578 | serial->bt_desc = NULL; | |
579 | ||
580 | g_free(serial->bt_addr_local); | |
581 | serial->bt_addr_local = NULL; | |
582 | g_free(serial->bt_addr_remote); | |
583 | serial->bt_addr_remote = NULL; | |
584 | g_slist_free_full(serial->bt_source_args, g_free); | |
585 | serial->bt_source_args = NULL; | |
586 | ||
587 | return SR_OK; | |
588 | } | |
589 | ||
590 | /* Flush, discards pending RX data, empties buffers. */ | |
591 | static int ser_bt_flush(struct sr_serial_dev_inst *serial) | |
592 | { | |
593 | (void)serial; | |
594 | /* EMPTY */ | |
595 | ||
596 | return SR_OK; | |
597 | } | |
598 | ||
599 | /* Drain, waits for completion of pending TX data. */ | |
600 | static int ser_bt_drain(struct sr_serial_dev_inst *serial) | |
601 | { | |
602 | (void)serial; | |
603 | /* EMPTY */ /* TODO? */ | |
604 | ||
605 | return SR_ERR_BUG; | |
606 | } | |
607 | ||
608 | static int ser_bt_write(struct sr_serial_dev_inst *serial, | |
609 | const void *buf, size_t count, | |
610 | int nonblocking, unsigned int timeout_ms) | |
611 | { | |
612 | ssize_t wrlen; | |
613 | ||
614 | /* | |
615 | * TODO Support chunked transmission when callers' requests | |
616 | * exceed the BT channel's capacity? See ser_hid_write(). | |
617 | */ | |
618 | ||
619 | switch (serial->bt_conn_type) { | |
620 | case SER_BT_CONN_RFCOMM: | |
621 | (void)nonblocking; | |
622 | (void)timeout_ms; | |
623 | wrlen = sr_bt_write(serial->bt_desc, buf, count); | |
624 | if (wrlen < 0) | |
625 | return SR_ERR_IO; | |
626 | return wrlen; | |
627 | case SER_BT_CONN_BLE122: | |
628 | case SER_BT_CONN_NRF51: | |
629 | case SER_BT_CONN_CC254x: | |
d0a73799 | 630 | case SER_BT_CONN_AC6328: |
dae34e30 | 631 | case SER_BT_CONN_NOTIFY: |
b79c3422 GS |
632 | /* |
633 | * Assume that when applications call the serial layer's | |
634 | * write routine, then the BLE chip/module does support | |
635 | * a TX handle. Just call the serial-BT library's write | |
636 | * routine. | |
637 | */ | |
638 | (void)nonblocking; | |
639 | (void)timeout_ms; | |
640 | wrlen = sr_bt_write(serial->bt_desc, buf, count); | |
641 | if (wrlen < 0) | |
642 | return SR_ERR_IO; | |
643 | return wrlen; | |
644 | default: | |
645 | return SR_ERR_ARG; | |
646 | } | |
647 | /* UNREACH */ | |
648 | } | |
649 | ||
650 | static int ser_bt_read(struct sr_serial_dev_inst *serial, | |
651 | void *buf, size_t count, | |
652 | int nonblocking, unsigned int timeout_ms) | |
653 | { | |
654 | gint64 deadline_us, now_us; | |
655 | uint8_t buffer[SER_BT_CHUNK_SIZE]; | |
656 | ssize_t rdlen; | |
657 | int rc; | |
658 | size_t dlen; | |
659 | ||
660 | /* | |
661 | * Immediately satisfy the caller's request from the RX buffer | |
662 | * if the requested amount of data is available already. | |
663 | */ | |
bf6b9e7b UH |
664 | if (sr_ser_has_queued_data(serial) >= count) |
665 | return sr_ser_unqueue_rx_data(serial, buf, count); | |
b79c3422 GS |
666 | |
667 | /* | |
668 | * When a timeout was specified, then determine the deadline | |
669 | * where to stop reception. | |
670 | */ | |
671 | deadline_us = 0; | |
b79c3422 GS |
672 | if (timeout_ms) { |
673 | now_us = g_get_monotonic_time(); | |
674 | deadline_us = now_us + timeout_ms * 1000; | |
675 | } | |
676 | ||
677 | /* | |
678 | * Keep receiving from the port until the caller's requested | |
679 | * amount of data has become available, or the timeout has | |
680 | * expired. In the absence of a timeout, stop reading when an | |
681 | * attempt no longer yields receive data. | |
682 | */ | |
683 | while (TRUE) { | |
684 | /* Run another attempt to receive data. */ | |
685 | switch (serial->bt_conn_type) { | |
686 | case SER_BT_CONN_RFCOMM: | |
687 | rdlen = sr_bt_read(serial->bt_desc, buffer, sizeof(buffer)); | |
688 | if (rdlen <= 0) | |
689 | break; | |
690 | rc = ser_bt_data_cb(serial, buffer, rdlen); | |
691 | if (rc < 0) | |
692 | rdlen = -1; | |
693 | break; | |
694 | case SER_BT_CONN_BLE122: | |
695 | case SER_BT_CONN_NRF51: | |
696 | case SER_BT_CONN_CC254x: | |
d0a73799 | 697 | case SER_BT_CONN_AC6328: |
dae34e30 | 698 | case SER_BT_CONN_NOTIFY: |
b79c3422 GS |
699 | dlen = sr_ser_has_queued_data(serial); |
700 | rc = sr_bt_check_notify(serial->bt_desc); | |
701 | if (rc < 0) | |
702 | rdlen = -1; | |
703 | else if (sr_ser_has_queued_data(serial) != dlen) | |
704 | rdlen = +1; | |
705 | else | |
706 | rdlen = 0; | |
707 | break; | |
708 | default: | |
709 | rdlen = -1; | |
710 | break; | |
711 | } | |
712 | ||
713 | /* | |
714 | * Stop upon receive errors, or timeout expiration. Only | |
715 | * stop upon empty reception in the absence of a timeout. | |
716 | */ | |
717 | if (rdlen < 0) | |
718 | break; | |
719 | if (nonblocking && !rdlen) | |
720 | break; | |
721 | if (deadline_us) { | |
722 | now_us = g_get_monotonic_time(); | |
723 | if (now_us > deadline_us) | |
724 | break; | |
725 | } | |
726 | ||
727 | /* Also stop when sufficient data has become available. */ | |
728 | if (sr_ser_has_queued_data(serial) >= count) | |
729 | break; | |
730 | } | |
731 | ||
732 | /* | |
733 | * Satisfy the caller's demand for receive data from previously | |
734 | * queued incoming data. | |
735 | */ | |
736 | dlen = sr_ser_has_queued_data(serial); | |
737 | if (dlen > count) | |
738 | dlen = count; | |
739 | if (!dlen) | |
740 | return 0; | |
741 | ||
742 | return sr_ser_unqueue_rx_data(serial, buf, dlen); | |
743 | } | |
744 | ||
b79c3422 GS |
745 | struct bt_source_args_t { |
746 | /* The application callback. */ | |
747 | sr_receive_data_callback cb; | |
748 | void *cb_data; | |
749 | /* The serial device, to store RX data. */ | |
750 | struct sr_serial_dev_inst *serial; | |
751 | }; | |
752 | ||
753 | /* | |
754 | * Gets periodically invoked by the glib main loop. "Drives" (checks) | |
755 | * progress of BT communication, and invokes the application's callback | |
756 | * which processes RX data (when some has become available), as well as | |
757 | * handles application level timeouts. | |
758 | */ | |
759 | static int bt_source_cb(int fd, int revents, void *cb_data) | |
760 | { | |
761 | struct bt_source_args_t *args; | |
762 | struct sr_serial_dev_inst *serial; | |
763 | uint8_t rx_buf[SER_BT_CHUNK_SIZE]; | |
764 | ssize_t rdlen; | |
765 | size_t dlen; | |
766 | int rc; | |
767 | ||
768 | args = cb_data; | |
769 | if (!args) | |
770 | return -1; | |
771 | serial = args->serial; | |
772 | if (!serial) | |
773 | return -1; | |
774 | if (!serial->bt_conn_type) | |
775 | return -1; | |
776 | ||
777 | /* | |
778 | * Drain receive data which the channel might have pending. | |
779 | * This is "a copy" of the "background part" of ser_bt_read(), | |
780 | * without the timeout support code, and not knowing how much | |
781 | * data the application is expecting. | |
782 | */ | |
783 | do { | |
784 | switch (serial->bt_conn_type) { | |
785 | case SER_BT_CONN_RFCOMM: | |
786 | rdlen = sr_bt_read(serial->bt_desc, rx_buf, sizeof(rx_buf)); | |
787 | if (rdlen <= 0) | |
788 | break; | |
789 | rc = ser_bt_data_cb(serial, rx_buf, rdlen); | |
790 | if (rc < 0) | |
791 | rdlen = -1; | |
792 | break; | |
793 | case SER_BT_CONN_BLE122: | |
794 | case SER_BT_CONN_NRF51: | |
795 | case SER_BT_CONN_CC254x: | |
d0a73799 | 796 | case SER_BT_CONN_AC6328: |
dae34e30 | 797 | case SER_BT_CONN_NOTIFY: |
b79c3422 GS |
798 | dlen = sr_ser_has_queued_data(serial); |
799 | rc = sr_bt_check_notify(serial->bt_desc); | |
800 | if (rc < 0) | |
801 | rdlen = -1; | |
802 | else if (sr_ser_has_queued_data(serial) != dlen) | |
803 | rdlen = +1; | |
804 | else | |
805 | rdlen = 0; | |
806 | break; | |
807 | default: | |
808 | rdlen = -1; | |
809 | break; | |
810 | } | |
811 | } while (rdlen > 0); | |
812 | ||
813 | /* | |
814 | * When RX data became available (now or earlier), pass this | |
815 | * condition to the application callback. Always periodically | |
816 | * run the application callback, since it handles timeouts and | |
817 | * might carry out other tasks as well like signalling progress. | |
818 | */ | |
819 | if (sr_ser_has_queued_data(args->serial)) | |
820 | revents |= G_IO_IN; | |
821 | rc = args->cb(fd, revents, args->cb_data); | |
822 | ||
823 | return rc; | |
824 | } | |
825 | ||
826 | /* TODO Can we use the Bluetooth socket's file descriptor? Probably not portably. */ | |
827 | #define WITH_MAXIMUM_TIMEOUT_VALUE 0 | |
828 | static int ser_bt_setup_source_add(struct sr_session *session, | |
829 | struct sr_serial_dev_inst *serial, | |
830 | int events, int timeout, | |
831 | sr_receive_data_callback cb, void *cb_data) | |
832 | { | |
833 | struct bt_source_args_t *args; | |
834 | int rc; | |
835 | ||
836 | (void)events; | |
837 | ||
838 | /* Optionally enforce a minimum poll period. */ | |
839 | if (WITH_MAXIMUM_TIMEOUT_VALUE && timeout > WITH_MAXIMUM_TIMEOUT_VALUE) | |
840 | timeout = WITH_MAXIMUM_TIMEOUT_VALUE; | |
841 | ||
842 | /* Allocate status container for background data reception. */ | |
843 | args = g_malloc0(sizeof(*args)); | |
844 | args->cb = cb; | |
845 | args->cb_data = cb_data; | |
846 | args->serial = serial; | |
847 | ||
848 | /* | |
849 | * Have a periodic timer installed. Register the allocated block | |
850 | * with the serial device, since the GSource's finalizer won't | |
851 | * free the memory, and we haven't bothered to create a custom | |
852 | * BT specific GSource. | |
853 | */ | |
854 | rc = sr_session_source_add(session, -1, events, timeout, bt_source_cb, args); | |
855 | if (rc != SR_OK) { | |
856 | g_free(args); | |
857 | return rc; | |
858 | } | |
859 | serial->bt_source_args = g_slist_append(serial->bt_source_args, args); | |
860 | ||
861 | return SR_OK; | |
862 | } | |
863 | ||
864 | static int ser_bt_setup_source_remove(struct sr_session *session, | |
865 | struct sr_serial_dev_inst *serial) | |
866 | { | |
867 | (void)serial; | |
868 | ||
869 | (void)sr_session_source_remove(session, -1); | |
870 | /* Release callback args here already? */ | |
871 | ||
872 | return SR_OK; | |
873 | } | |
874 | ||
b79c3422 GS |
875 | struct bt_scan_args_t { |
876 | GSList *port_list; | |
877 | sr_ser_list_append_t append; | |
878 | GSList *addr_list; | |
879 | const char *bt_type; | |
880 | }; | |
881 | ||
882 | static void scan_cb(void *cb_args, const char *addr, const char *name) | |
883 | { | |
884 | struct bt_scan_args_t *scan_args; | |
885 | GSList *l; | |
886 | char addr_text[20]; | |
c622c88c | 887 | const struct scan_supported_item *item; |
b79c3422 GS |
888 | enum ser_bt_conn_t type; |
889 | char *port_name, *port_desc; | |
890 | char *addr_copy; | |
891 | ||
892 | scan_args = cb_args; | |
893 | if (!scan_args) | |
894 | return; | |
895 | sr_info("BT scan, found: %s - %s\n", addr, name); | |
896 | ||
897 | /* Check whether the device was seen before. */ | |
898 | for (l = scan_args->addr_list; l; l = l->next) { | |
bf6b9e7b | 899 | if (strcmp(addr, l->data) == 0) |
b79c3422 | 900 | return; |
b79c3422 GS |
901 | } |
902 | ||
903 | /* Substitute colons in the address by dashes. */ | |
904 | if (!addr || !*addr) | |
905 | return; | |
906 | snprintf(addr_text, sizeof(addr_text), "%s", addr); | |
907 | g_strcanon(addr_text, "0123456789abcdefABCDEF", '-'); | |
908 | ||
909 | /* Create a port name, and a description. */ | |
c622c88c GS |
910 | item = scan_is_supported(name); |
911 | type = item ? item->type : SER_BT_CONN_UNKNOWN; | |
912 | port_name = g_strdup_printf("%s/%s/%s%s", | |
913 | SER_BT_CONN_PREFIX, conn_name_text(type), addr_text, | |
914 | (item && item->add_params) ? item->add_params : ""); | |
b79c3422 GS |
915 | port_desc = g_strdup_printf("%s (%s)", name, scan_args->bt_type); |
916 | ||
917 | scan_args->port_list = scan_args->append(scan_args->port_list, port_name, port_desc); | |
918 | g_free(port_name); | |
919 | g_free(port_desc); | |
920 | ||
921 | /* Keep track of the handled address. */ | |
922 | addr_copy = g_strdup(addr); | |
923 | scan_args->addr_list = g_slist_append(scan_args->addr_list, addr_copy); | |
924 | } | |
925 | ||
926 | static GSList *ser_bt_list(GSList *list, sr_ser_list_append_t append) | |
927 | { | |
a1b80f9d | 928 | static const int scan_duration = 3; |
b79c3422 GS |
929 | |
930 | struct bt_scan_args_t scan_args; | |
931 | struct sr_bt_desc *desc; | |
932 | ||
933 | /* | |
934 | * Implementor's note: This "list" routine is best-effort. We | |
935 | * assume that registering callbacks always succeeds. Silently | |
936 | * ignore failure to scan for devices. Just return those which | |
937 | * we happen to find. | |
938 | */ | |
939 | ||
940 | desc = sr_bt_desc_new(); | |
941 | if (!desc) | |
942 | return list; | |
943 | ||
944 | memset(&scan_args, 0, sizeof(scan_args)); | |
945 | scan_args.port_list = list; | |
946 | scan_args.append = append; | |
947 | ||
948 | scan_args.addr_list = NULL; | |
949 | scan_args.bt_type = "BT"; | |
950 | (void)sr_bt_config_cb_scan(desc, scan_cb, &scan_args); | |
951 | (void)sr_bt_scan_bt(desc, scan_duration); | |
952 | g_slist_free_full(scan_args.addr_list, g_free); | |
953 | ||
954 | scan_args.addr_list = NULL; | |
955 | scan_args.bt_type = "BLE"; | |
956 | (void)sr_bt_config_cb_scan(desc, scan_cb, &scan_args); | |
957 | (void)sr_bt_scan_le(desc, scan_duration); | |
958 | g_slist_free_full(scan_args.addr_list, g_free); | |
959 | ||
960 | sr_bt_desc_free(desc); | |
961 | ||
962 | return scan_args.port_list; | |
963 | } | |
964 | ||
965 | static struct ser_lib_functions serlib_bt = { | |
966 | .open = ser_bt_open, | |
967 | .close = ser_bt_close, | |
968 | .flush = ser_bt_flush, | |
969 | .drain = ser_bt_drain, | |
970 | .write = ser_bt_write, | |
971 | .read = ser_bt_read, | |
c0aa074e UH |
972 | /* |
973 | * Bluetooth communication has no concept of bitrate, so ignore | |
974 | * these arguments silently. Neither need we pass the frame format | |
975 | * down to internal BT comm routines, nor need we keep the values | |
976 | * here, since the caller will cache/register them already. | |
977 | */ | |
978 | .set_params = std_dummy_set_params, | |
3ad30b4e | 979 | .set_handshake = std_dummy_set_handshake, |
b79c3422 GS |
980 | .setup_source_add = ser_bt_setup_source_add, |
981 | .setup_source_remove = ser_bt_setup_source_remove, | |
982 | .list = ser_bt_list, | |
983 | .get_frame_format = NULL, | |
984 | }; | |
985 | SR_PRIV struct ser_lib_functions *ser_lib_funcs_bt = &serlib_bt; | |
986 | ||
987 | /* }}} */ | |
988 | #else | |
989 | ||
990 | SR_PRIV int ser_name_is_bt(struct sr_serial_dev_inst *serial) | |
991 | { | |
992 | (void)serial; | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
997 | SR_PRIV struct ser_lib_functions *ser_lib_funcs_bt = NULL; | |
998 | ||
999 | #endif | |
1000 | #endif | |
1001 | ||
1002 | /** @} */ |