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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
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 <libusb.h> | |
23 | #include <libsigrok/libsigrok.h> | |
24 | #include "libsigrok-internal.h" | |
25 | #include "protocol.h" | |
26 | ||
27 | static const uint32_t scanopts[] = { | |
28 | SR_CONF_CONN, | |
29 | }; | |
30 | ||
31 | static const uint32_t drvopts[] = { | |
32 | SR_CONF_THERMOMETER, | |
33 | SR_CONF_HYGROMETER, | |
34 | }; | |
35 | ||
36 | static const uint32_t devopts[] = { | |
37 | SR_CONF_CONN | SR_CONF_GET, | |
38 | SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET, | |
39 | SR_CONF_DATALOG | SR_CONF_GET | SR_CONF_SET, | |
40 | }; | |
41 | ||
42 | static GSList *scan(struct sr_dev_driver *di, GSList *options) | |
43 | { | |
44 | struct drv_context *drvc; | |
45 | struct sr_dev_inst *sdi; | |
46 | struct sr_usb_dev_inst *usb; | |
47 | struct sr_config *src; | |
48 | GSList *usb_devices, *devices, *l; | |
49 | const char *conn; | |
50 | ||
51 | drvc = di->context; | |
52 | ||
53 | conn = NULL; | |
54 | for (l = options; l; l = l->next) { | |
55 | src = l->data; | |
56 | switch (src->key) { | |
57 | case SR_CONF_CONN: | |
58 | conn = g_variant_get_string(src->data, NULL); | |
59 | break; | |
60 | } | |
61 | } | |
62 | if (!conn) | |
63 | return NULL; | |
64 | ||
65 | devices = NULL; | |
66 | if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) { | |
67 | /* We have a list of sr_usb_dev_inst matching the connection | |
68 | * string. Wrap them in sr_dev_inst and we're done. */ | |
69 | for (l = usb_devices; l; l = l->next) { | |
70 | usb = l->data; | |
71 | if (!(sdi = lascar_scan(usb->bus, usb->address))) { | |
72 | /* Not a Lascar EL-USB. */ | |
73 | g_free(usb); | |
74 | continue; | |
75 | } | |
76 | sdi->inst_type = SR_INST_USB; | |
77 | sdi->conn = usb; | |
78 | devices = g_slist_append(devices, sdi); | |
79 | } | |
80 | g_slist_free(usb_devices); | |
81 | } else | |
82 | g_slist_free_full(usb_devices, g_free); | |
83 | ||
84 | return std_scan_complete(di, devices); | |
85 | } | |
86 | ||
87 | static int dev_open(struct sr_dev_inst *sdi) | |
88 | { | |
89 | struct sr_dev_driver *di = sdi->driver; | |
90 | struct drv_context *drvc = di->context;; | |
91 | struct sr_usb_dev_inst *usb; | |
92 | int ret; | |
93 | ||
94 | usb = sdi->conn; | |
95 | ||
96 | if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK) | |
97 | return SR_ERR; | |
98 | ||
99 | if ((ret = libusb_claim_interface(usb->devhdl, LASCAR_INTERFACE))) { | |
100 | sr_err("Failed to claim interface: %s.", libusb_error_name(ret)); | |
101 | return SR_ERR; | |
102 | } | |
103 | ||
104 | return SR_OK; | |
105 | } | |
106 | ||
107 | static int dev_close(struct sr_dev_inst *sdi) | |
108 | { | |
109 | struct sr_usb_dev_inst *usb; | |
110 | ||
111 | usb = sdi->conn; | |
112 | ||
113 | if (!usb->devhdl) | |
114 | return SR_ERR_BUG; | |
115 | ||
116 | libusb_release_interface(usb->devhdl, LASCAR_INTERFACE); | |
117 | libusb_close(usb->devhdl); | |
118 | usb->devhdl = NULL; | |
119 | ||
120 | return SR_OK; | |
121 | } | |
122 | ||
123 | static int config_get(uint32_t key, GVariant **data, | |
124 | const struct sr_dev_inst *sdi, const struct sr_channel_group *cg) | |
125 | { | |
126 | struct dev_context *devc; | |
127 | struct sr_usb_dev_inst *usb; | |
128 | int ret; | |
129 | ||
130 | (void)cg; | |
131 | ||
132 | devc = sdi->priv; | |
133 | switch (key) { | |
134 | case SR_CONF_CONN: | |
135 | if (!sdi || !sdi->conn) | |
136 | return SR_ERR_ARG; | |
137 | usb = sdi->conn; | |
138 | *data = g_variant_new_printf("%d.%d", usb->bus, usb->address); | |
139 | break; | |
140 | case SR_CONF_DATALOG: | |
141 | if (!sdi) | |
142 | return SR_ERR_ARG; | |
143 | if ((ret = lascar_is_logging(sdi)) == -1) | |
144 | return SR_ERR; | |
145 | *data = g_variant_new_boolean(ret ? TRUE : FALSE); | |
146 | break; | |
147 | case SR_CONF_LIMIT_SAMPLES: | |
148 | *data = g_variant_new_uint64(devc->limit_samples); | |
149 | break; | |
150 | default: | |
151 | return SR_ERR_NA; | |
152 | } | |
153 | ||
154 | return SR_OK; | |
155 | } | |
156 | ||
157 | static int config_set(uint32_t key, GVariant *data, | |
158 | const struct sr_dev_inst *sdi, const struct sr_channel_group *cg) | |
159 | { | |
160 | struct dev_context *devc; | |
161 | ||
162 | (void)cg; | |
163 | ||
164 | devc = sdi->priv; | |
165 | ||
166 | switch (key) { | |
167 | case SR_CONF_DATALOG: | |
168 | if (g_variant_get_boolean(data)) | |
169 | return lascar_start_logging(sdi); | |
170 | else | |
171 | return lascar_stop_logging(sdi); | |
172 | break; | |
173 | case SR_CONF_LIMIT_SAMPLES: | |
174 | devc->limit_samples = g_variant_get_uint64(data); | |
175 | break; | |
176 | default: | |
177 | return SR_ERR_NA; | |
178 | } | |
179 | ||
180 | return SR_OK; | |
181 | } | |
182 | ||
183 | static int config_list(uint32_t key, GVariant **data, | |
184 | const struct sr_dev_inst *sdi, const struct sr_channel_group *cg) | |
185 | { | |
186 | return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts); | |
187 | } | |
188 | ||
189 | static void LIBUSB_CALL mark_xfer(struct libusb_transfer *xfer) | |
190 | { | |
191 | ||
192 | if (xfer->status == LIBUSB_TRANSFER_COMPLETED) | |
193 | xfer->user_data = GINT_TO_POINTER(1); | |
194 | else | |
195 | xfer->user_data = GINT_TO_POINTER(-1); | |
196 | ||
197 | } | |
198 | ||
199 | /* The Lascar software, in its infinite ignorance, reads a set of four | |
200 | * bytes from the device config struct and interprets it as a float. | |
201 | * That only works because they only use windows, and only on x86. However | |
202 | * we may be running on any architecture, any operating system. So we have | |
203 | * to convert these four bytes as the Lascar software would on windows/x86, | |
204 | * to the local representation of a float. | |
205 | * The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */ | |
206 | static float binary32_le_to_float(unsigned char *buf) | |
207 | { | |
208 | GFloatIEEE754 f; | |
209 | ||
210 | f.v_float = 0; | |
211 | f.mpn.sign = (buf[3] & 0x80) ? 1 : 0; | |
212 | f.mpn.biased_exponent = (buf[3] << 1) | (buf[2] >> 7); | |
213 | f.mpn.mantissa = buf[0] | (buf[1] << 8) | ((buf[2] & 0x7f) << 16); | |
214 | ||
215 | return f.v_float; | |
216 | } | |
217 | ||
218 | static int lascar_proc_config(const struct sr_dev_inst *sdi) | |
219 | { | |
220 | struct dev_context *devc; | |
221 | struct sr_usb_dev_inst *usb; | |
222 | int dummy, ret; | |
223 | ||
224 | devc = sdi->priv; | |
225 | usb = sdi->conn; | |
226 | ||
227 | if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK) | |
228 | return SR_ERR; | |
229 | ||
230 | ret = SR_OK; | |
231 | switch (devc->profile->logformat) { | |
232 | case LOG_TEMP_RH: | |
233 | devc->sample_size = 2; | |
234 | devc->temp_unit = devc->config[0x2e] | (devc->config[0x2f] << 8); | |
235 | if (devc->temp_unit != 0 && devc->temp_unit != 1) { | |
236 | sr_dbg("invalid temperature unit %d", devc->temp_unit); | |
237 | /* Default to Celsius, we're all adults here. */ | |
238 | devc->temp_unit = 0; | |
239 | } else | |
240 | sr_dbg("temperature unit is %s", devc->temp_unit | |
241 | ? "Fahrenheit" : "Celsius"); | |
242 | break; | |
243 | case LOG_CO: | |
244 | devc->sample_size = 2; | |
245 | devc->co_high = binary32_le_to_float(devc->config + 0x24); | |
246 | devc->co_low = binary32_le_to_float(devc->config + 0x28); | |
247 | sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high, | |
248 | devc->co_low); | |
249 | break; | |
250 | default: | |
251 | ret = SR_ERR_ARG; | |
252 | } | |
253 | devc->logged_samples = devc->config[0x1e] | (devc->config[0x1f] << 8); | |
254 | sr_dbg("device log contains %d samples.", devc->logged_samples); | |
255 | ||
256 | return ret; | |
257 | } | |
258 | ||
259 | static int dev_acquisition_start(const struct sr_dev_inst *sdi) | |
260 | { | |
261 | struct sr_dev_driver *di = sdi->driver; | |
262 | struct sr_datafeed_packet packet; | |
263 | struct sr_datafeed_meta meta; | |
264 | struct sr_config *src; | |
265 | struct dev_context *devc; | |
266 | struct drv_context *drvc; | |
267 | struct sr_usb_dev_inst *usb; | |
268 | struct libusb_transfer *xfer_in, *xfer_out; | |
269 | struct timeval tv; | |
270 | uint64_t interval; | |
271 | int ret; | |
272 | unsigned char cmd[3], resp[4], *buf; | |
273 | ||
274 | drvc = di->context; | |
275 | devc = sdi->priv; | |
276 | usb = sdi->conn; | |
277 | ||
278 | if (lascar_proc_config(sdi) != SR_OK) | |
279 | return SR_ERR; | |
280 | ||
281 | sr_dbg("Starting log retrieval."); | |
282 | ||
283 | std_session_send_df_header(sdi); | |
284 | ||
285 | interval = (devc->config[0x1c] | (devc->config[0x1d] << 8)) * 1000; | |
286 | packet.type = SR_DF_META; | |
287 | packet.payload = &meta; | |
288 | src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval)); | |
289 | meta.config = g_slist_append(NULL, src); | |
290 | sr_session_send(sdi, &packet); | |
291 | g_free(src); | |
292 | ||
293 | if (devc->logged_samples == 0) { | |
294 | /* This ensures the frontend knows the session is done. */ | |
295 | std_session_send_df_end(sdi); | |
296 | return SR_OK; | |
297 | } | |
298 | ||
299 | if (!(xfer_in = libusb_alloc_transfer(0)) || | |
300 | !(xfer_out = libusb_alloc_transfer(0))) | |
301 | return SR_ERR; | |
302 | ||
303 | libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR, | |
304 | 0x00, 0xffff, 0x00, NULL, 0, 50); | |
305 | libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR, | |
306 | 0x02, 0x0002, 0x00, NULL, 0, 50); | |
307 | libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR, | |
308 | 0x02, 0x0001, 0x00, NULL, 0, 50); | |
309 | ||
310 | /* Flush input. The F321 requires this. */ | |
311 | while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp, | |
312 | 256, &ret, 5) == 0 && ret > 0) | |
313 | ; | |
314 | ||
315 | libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN, | |
316 | resp, sizeof(resp), mark_xfer, 0, BULK_XFER_TIMEOUT); | |
317 | if (libusb_submit_transfer(xfer_in) != 0) { | |
318 | libusb_free_transfer(xfer_in); | |
319 | libusb_free_transfer(xfer_out); | |
320 | return SR_ERR; | |
321 | } | |
322 | ||
323 | cmd[0] = 0x03; | |
324 | cmd[1] = 0xff; | |
325 | cmd[2] = 0xff; | |
326 | libusb_fill_bulk_transfer(xfer_out, usb->devhdl, LASCAR_EP_OUT, | |
327 | cmd, 3, mark_xfer, 0, 100); | |
328 | if (libusb_submit_transfer(xfer_out) != 0) { | |
329 | libusb_free_transfer(xfer_in); | |
330 | libusb_free_transfer(xfer_out); | |
331 | return SR_ERR; | |
332 | } | |
333 | ||
334 | tv.tv_sec = 0; | |
335 | tv.tv_usec = 0; | |
336 | while (!xfer_in->user_data || !xfer_out->user_data) { | |
337 | g_usleep(SLEEP_US_LONG); | |
338 | libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv); | |
339 | } | |
340 | if (xfer_in->user_data != GINT_TO_POINTER(1) || | |
341 | xfer_out->user_data != GINT_TO_POINTER(1)) { | |
342 | sr_dbg("no response to log transfer request"); | |
343 | libusb_free_transfer(xfer_in); | |
344 | libusb_free_transfer(xfer_out); | |
345 | return SR_ERR; | |
346 | } | |
347 | if (xfer_in->actual_length != 3 || xfer_in->buffer[0] != 2) { | |
348 | sr_dbg("invalid response to log transfer request"); | |
349 | libusb_free_transfer(xfer_in); | |
350 | libusb_free_transfer(xfer_out); | |
351 | return SR_ERR; | |
352 | } | |
353 | devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8); | |
354 | libusb_free_transfer(xfer_out); | |
355 | ||
356 | usb_source_add(sdi->session, drvc->sr_ctx, 100, | |
357 | lascar_el_usb_handle_events, (void *)sdi); | |
358 | ||
359 | buf = g_malloc(4096); | |
360 | libusb_fill_bulk_transfer(xfer_in, usb->devhdl, LASCAR_EP_IN, | |
361 | buf, 4096, lascar_el_usb_receive_transfer, | |
362 | (struct sr_dev_inst *)sdi, 100); | |
363 | if ((ret = libusb_submit_transfer(xfer_in) != 0)) { | |
364 | sr_err("Unable to submit transfer: %s.", libusb_error_name(ret)); | |
365 | libusb_free_transfer(xfer_in); | |
366 | g_free(buf); | |
367 | return SR_ERR; | |
368 | } | |
369 | ||
370 | return SR_OK; | |
371 | } | |
372 | ||
373 | static int dev_acquisition_stop(struct sr_dev_inst *sdi) | |
374 | { | |
375 | sdi->status = SR_ST_STOPPING; | |
376 | /* TODO: free ongoing transfers? */ | |
377 | ||
378 | return SR_OK; | |
379 | } | |
380 | ||
381 | SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = { | |
382 | .name = "lascar-el-usb", | |
383 | .longname = "Lascar EL-USB", | |
384 | .api_version = 1, | |
385 | .init = std_init, | |
386 | .cleanup = std_cleanup, | |
387 | .scan = scan, | |
388 | .dev_list = std_dev_list, | |
389 | .dev_clear = std_dev_clear, | |
390 | .config_get = config_get, | |
391 | .config_set = config_set, | |
392 | .config_list = config_list, | |
393 | .dev_open = dev_open, | |
394 | .dev_close = dev_close, | |
395 | .dev_acquisition_start = dev_acquisition_start, | |
396 | .dev_acquisition_stop = dev_acquisition_stop, | |
397 | .context = NULL, | |
398 | }; | |
399 | SR_REGISTER_DEV_DRIVER(lascar_el_usb_driver_info); |