uthum.c revision 1.11 1 1.11 skrll /* $NetBSD: uthum.c,v 1.11 2016/04/23 10:15:32 skrll Exp $ */
2 1.1 tonio /* $OpenBSD: uthum.c,v 1.6 2010/01/03 18:43:02 deraadt Exp $ */
3 1.1 tonio
4 1.1 tonio /*
5 1.1 tonio * Copyright (c) 2009 Yojiro UO <yuo (at) nui.org>
6 1.1 tonio *
7 1.1 tonio * Permission to use, copy, modify, and distribute this software for any
8 1.1 tonio * purpose with or without fee is hereby granted, provided that the above
9 1.1 tonio * copyright notice and this permission notice appear in all copies.
10 1.1 tonio *
11 1.1 tonio * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCAIMS ALL WARRANTIES
12 1.1 tonio * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 1.1 tonio * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 1.1 tonio * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 1.1 tonio * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 1.1 tonio * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 1.1 tonio * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 1.1 tonio */
19 1.1 tonio
20 1.9 christos /*
21 1.9 christos * Driver for TEMPer and TEMPerHUM HID
22 1.9 christos */
23 1.9 christos
24 1.9 christos #include <sys/cdefs.h>
25 1.11 skrll __KERNEL_RCSID(0, "$NetBSD: uthum.c,v 1.11 2016/04/23 10:15:32 skrll Exp $");
26 1.1 tonio
27 1.1 tonio #include <sys/param.h>
28 1.1 tonio #include <sys/proc.h>
29 1.1 tonio #include <sys/systm.h>
30 1.1 tonio #include <sys/kernel.h>
31 1.1 tonio #include <sys/device.h>
32 1.1 tonio #include <sys/conf.h>
33 1.1 tonio
34 1.1 tonio #include <dev/sysmon/sysmonvar.h>
35 1.1 tonio
36 1.1 tonio #include <dev/usb/usb.h>
37 1.1 tonio #include <dev/usb/usbhid.h>
38 1.1 tonio #include <dev/usb/usbdi.h>
39 1.1 tonio #include <dev/usb/usbdi_util.h>
40 1.1 tonio #include <dev/usb/usbdevs.h>
41 1.1 tonio #include <dev/usb/uhidev.h>
42 1.1 tonio #include <dev/usb/hid.h>
43 1.1 tonio
44 1.1 tonio #ifdef UTHUM_DEBUG
45 1.1 tonio int uthumdebug = 0;
46 1.1 tonio #define DPRINTFN(n, x) do { if (uthumdebug > (n)) printf x; } while (0)
47 1.1 tonio #else
48 1.1 tonio #define DPRINTFN(n, x)
49 1.1 tonio #endif
50 1.1 tonio
51 1.1 tonio #define DPRINTF(x) DPRINTFN(0, x)
52 1.1 tonio
53 1.1 tonio
54 1.1 tonio /* TEMPerHUM */
55 1.1 tonio #define CMD_DEVTYPE 0x52 /* XXX */
56 1.1 tonio #define CMD_GETDATA 0x48 /* XXX */
57 1.1 tonio #define CMD_GETTEMP 0x54 /* XXX */
58 1.1 tonio static uint8_t cmd_start[8] =
59 1.1 tonio { 0x0a, 0x0b, 0x0c, 0x0d, 0x00, 0x00, 0x02, 0x00 };
60 1.1 tonio static uint8_t cmd_end[8] =
61 1.1 tonio { 0x0a, 0x0b, 0x0c, 0x0d, 0x00, 0x00, 0x01, 0x00 };
62 1.1 tonio
63 1.1 tonio /* sensors */
64 1.1 tonio #define UTHUM_TEMP 0
65 1.1 tonio #define UTHUM_HUMIDITY 1
66 1.1 tonio #define UTHUM_MAX_SENSORS 2
67 1.1 tonio
68 1.1 tonio #define UTHUM_TYPE_UNKNOWN 0
69 1.1 tonio #define UTHUM_TYPE_SHT1x 1
70 1.1 tonio #define UTHUM_TYPE_TEMPER 2
71 1.1 tonio
72 1.1 tonio struct uthum_softc {
73 1.1 tonio struct uhidev sc_hdev;
74 1.11 skrll struct usbd_device * sc_udev;
75 1.1 tonio u_char sc_dying;
76 1.1 tonio uint16_t sc_flag;
77 1.1 tonio int sc_sensortype;
78 1.1 tonio
79 1.1 tonio /* uhidev parameters */
80 1.1 tonio size_t sc_flen; /* feature report length */
81 1.1 tonio size_t sc_ilen; /* input report length */
82 1.1 tonio size_t sc_olen; /* output report length */
83 1.1 tonio
84 1.1 tonio /* sensor framework */
85 1.1 tonio struct sysmon_envsys *sc_sme;
86 1.1 tonio envsys_data_t sc_sensor[UTHUM_MAX_SENSORS];
87 1.1 tonio
88 1.1 tonio uint8_t sc_num_sensors;
89 1.1 tonio };
90 1.1 tonio
91 1.1 tonio
92 1.1 tonio const struct usb_devno uthum_devs[] = {
93 1.1 tonio /* XXX: various TEMPer variants using same VID/PID */
94 1.1 tonio { USB_VENDOR_TENX, USB_PRODUCT_TENX_TEMPER},
95 1.1 tonio };
96 1.1 tonio #define uthum_lookup(v, p) usb_lookup(uthum_devs, v, p)
97 1.1 tonio
98 1.1 tonio int uthum_match(device_t, cfdata_t, void *);
99 1.1 tonio void uthum_attach(device_t, device_t, void *);
100 1.1 tonio void uthum_childdet(device_t, device_t);
101 1.1 tonio int uthum_detach(device_t, int);
102 1.1 tonio int uthum_activate(device_t, enum devact);
103 1.1 tonio
104 1.1 tonio int uthum_read_data(struct uthum_softc *, uint8_t, uint8_t *, size_t, int);
105 1.1 tonio int uthum_check_sensortype(struct uthum_softc *);
106 1.5 jdc int uthum_temper_temp(uint8_t, uint8_t);
107 1.5 jdc int uthum_sht1x_temp(uint8_t, uint8_t);
108 1.1 tonio int uthum_sht1x_rh(unsigned int, int);
109 1.1 tonio
110 1.1 tonio void uthum_intr(struct uhidev *, void *, u_int);
111 1.1 tonio static void uthum_refresh(struct sysmon_envsys *, envsys_data_t *);
112 1.1 tonio
113 1.1 tonio extern struct cfdriver uthum_cd;
114 1.1 tonio CFATTACH_DECL_NEW(uthum, sizeof(struct uthum_softc), uthum_match, uthum_attach,
115 1.1 tonio uthum_detach, uthum_activate);
116 1.1 tonio
117 1.9 christos int
118 1.6 dyoung uthum_match(device_t parent, cfdata_t match, void *aux)
119 1.1 tonio {
120 1.11 skrll struct uhidev_attach_arg *uha = aux;
121 1.1 tonio
122 1.11 skrll return uthum_lookup(uha->uiaa->uiaa_vendor, uha->uiaa->uiaa_product) != NULL ?
123 1.11 skrll UMATCH_VENDOR_PRODUCT : UMATCH_NONE;
124 1.1 tonio }
125 1.1 tonio
126 1.9 christos void
127 1.6 dyoung uthum_attach(device_t parent, device_t self, void *aux)
128 1.1 tonio {
129 1.6 dyoung struct uthum_softc *sc = device_private(self);
130 1.11 skrll struct uhidev_attach_arg *uha = aux;
131 1.11 skrll struct usbd_device *dev = uha->parent->sc_udev;
132 1.1 tonio int size, repid;
133 1.1 tonio void *desc;
134 1.1 tonio
135 1.1 tonio sc->sc_udev = dev;
136 1.1 tonio sc->sc_hdev.sc_dev = self;
137 1.1 tonio sc->sc_hdev.sc_intr = uthum_intr;
138 1.1 tonio sc->sc_hdev.sc_parent = uha->parent;
139 1.1 tonio sc->sc_hdev.sc_report_id = uha->reportid;
140 1.1 tonio sc->sc_num_sensors = 0;
141 1.1 tonio
142 1.2 plunky aprint_normal("\n");
143 1.2 plunky aprint_naive("\n");
144 1.2 plunky
145 1.1 tonio uhidev_get_report_desc(uha->parent, &desc, &size);
146 1.1 tonio repid = uha->reportid;
147 1.1 tonio sc->sc_ilen = hid_report_size(desc, size, hid_input, repid);
148 1.1 tonio sc->sc_olen = hid_report_size(desc, size, hid_output, repid);
149 1.1 tonio sc->sc_flen = hid_report_size(desc, size, hid_feature, repid);
150 1.1 tonio
151 1.1 tonio usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
152 1.1 tonio sc->sc_hdev.sc_dev);
153 1.1 tonio
154 1.1 tonio if (sc->sc_flen < 32) {
155 1.1 tonio /* not sensor interface, just attach */
156 1.1 tonio return;
157 1.1 tonio }
158 1.1 tonio
159 1.1 tonio sc->sc_sensortype = uthum_check_sensortype(sc);
160 1.1 tonio
161 1.1 tonio /* attach sensor */
162 1.1 tonio sc->sc_sme = sysmon_envsys_create();
163 1.1 tonio sc->sc_sme->sme_name = device_xname(self);
164 1.1 tonio
165 1.1 tonio switch (sc->sc_sensortype) {
166 1.1 tonio case UTHUM_TYPE_SHT1x:
167 1.1 tonio (void)strlcpy(sc->sc_sensor[UTHUM_TEMP].desc, "temp",
168 1.1 tonio sizeof(sc->sc_sensor[UTHUM_TEMP].desc));
169 1.1 tonio sc->sc_sensor[UTHUM_TEMP].units = ENVSYS_STEMP;
170 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID;
171 1.1 tonio
172 1.3 cnst (void)strlcpy(sc->sc_sensor[UTHUM_HUMIDITY].desc,
173 1.3 cnst "relative humidity",
174 1.1 tonio sizeof(sc->sc_sensor[UTHUM_HUMIDITY].desc));
175 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].units = ENVSYS_INTEGER;
176 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].value_cur = 0;
177 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].state = ENVSYS_SINVALID;
178 1.1 tonio
179 1.1 tonio sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor[UTHUM_TEMP]);
180 1.1 tonio sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor[UTHUM_HUMIDITY]);
181 1.1 tonio sc->sc_num_sensors = 2;
182 1.1 tonio DPRINTF(("sensor type: SHT1x\n"));
183 1.1 tonio break;
184 1.1 tonio case UTHUM_TYPE_TEMPER:
185 1.1 tonio (void)strlcpy(sc->sc_sensor[UTHUM_TEMP].desc, "temp",
186 1.1 tonio sizeof(sc->sc_sensor[UTHUM_TEMP].desc));
187 1.1 tonio sc->sc_sensor[UTHUM_TEMP].units = ENVSYS_STEMP;
188 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID;
189 1.1 tonio
190 1.1 tonio sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor[UTHUM_TEMP]);
191 1.1 tonio sc->sc_num_sensors = 1;
192 1.1 tonio DPRINTF(("sensor type: TEMPer\n"));
193 1.1 tonio break;
194 1.1 tonio case UTHUM_TYPE_UNKNOWN:
195 1.1 tonio DPRINTF(("sensor type: unknown, give up to attach sensors\n"));
196 1.1 tonio default:
197 1.1 tonio break;
198 1.1 tonio }
199 1.1 tonio
200 1.1 tonio if (sc->sc_num_sensors > 0) {
201 1.1 tonio sc->sc_sme->sme_cookie = sc;
202 1.1 tonio sc->sc_sme->sme_refresh = uthum_refresh;
203 1.1 tonio
204 1.1 tonio if (sysmon_envsys_register(sc->sc_sme)) {
205 1.1 tonio aprint_error_dev(self, "unable to register with sysmon\n");
206 1.1 tonio sysmon_envsys_destroy(sc->sc_sme);
207 1.1 tonio }
208 1.1 tonio } else {
209 1.1 tonio sysmon_envsys_destroy(sc->sc_sme);
210 1.1 tonio }
211 1.1 tonio
212 1.1 tonio DPRINTF(("uthum_attach: complete\n"));
213 1.1 tonio }
214 1.1 tonio
215 1.9 christos int
216 1.6 dyoung uthum_detach(device_t self, int flags)
217 1.1 tonio {
218 1.6 dyoung struct uthum_softc *sc = device_private(self);
219 1.1 tonio int rv = 0;
220 1.1 tonio
221 1.1 tonio sc->sc_dying = 1;
222 1.1 tonio
223 1.1 tonio if (sc->sc_num_sensors > 0) {
224 1.1 tonio sysmon_envsys_unregister(sc->sc_sme);
225 1.1 tonio }
226 1.1 tonio
227 1.1 tonio usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
228 1.1 tonio sc->sc_hdev.sc_dev);
229 1.1 tonio
230 1.11 skrll return rv;
231 1.1 tonio }
232 1.1 tonio
233 1.1 tonio int
234 1.1 tonio uthum_activate(device_t self, enum devact act)
235 1.1 tonio {
236 1.1 tonio struct uthum_softc *sc = device_private(self);
237 1.1 tonio
238 1.1 tonio switch (act) {
239 1.1 tonio case DVACT_DEACTIVATE:
240 1.1 tonio sc->sc_dying = 1;
241 1.1 tonio break;
242 1.1 tonio }
243 1.11 skrll return 0;
244 1.1 tonio }
245 1.1 tonio
246 1.1 tonio void
247 1.1 tonio uthum_intr(struct uhidev *addr, void *ibuf, u_int len)
248 1.1 tonio {
249 1.1 tonio /* do nothing */
250 1.1 tonio }
251 1.1 tonio
252 1.1 tonio int
253 1.1 tonio uthum_read_data(struct uthum_softc *sc, uint8_t target_cmd, uint8_t *buf,
254 1.4 jdc size_t len, int need_delay)
255 1.1 tonio {
256 1.1 tonio int i;
257 1.1 tonio uint8_t cmdbuf[32], report[256];
258 1.1 tonio
259 1.1 tonio /* if return buffer is null, do nothing */
260 1.1 tonio if ((buf == NULL) || len == 0)
261 1.1 tonio return 0;
262 1.1 tonio
263 1.1 tonio /* issue query */
264 1.11 skrll memset(cmdbuf, 0, sizeof(cmdbuf));
265 1.1 tonio memcpy(cmdbuf, cmd_start, sizeof(cmd_start));
266 1.1 tonio if (uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT,
267 1.1 tonio cmdbuf, sc->sc_olen))
268 1.1 tonio return EIO;
269 1.1 tonio
270 1.11 skrll memset(cmdbuf, 0, sizeof(cmdbuf));
271 1.1 tonio cmdbuf[0] = target_cmd;
272 1.1 tonio if (uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT,
273 1.1 tonio cmdbuf, sc->sc_olen))
274 1.1 tonio return EIO;
275 1.1 tonio
276 1.11 skrll memset(cmdbuf, 0, sizeof(cmdbuf));
277 1.1 tonio for (i = 0; i < 7; i++) {
278 1.1 tonio if (uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT,
279 1.1 tonio cmdbuf, sc->sc_olen))
280 1.1 tonio return EIO;
281 1.1 tonio }
282 1.1 tonio memcpy(cmdbuf, cmd_end, sizeof(cmd_end));
283 1.1 tonio if (uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT,
284 1.1 tonio cmdbuf, sc->sc_olen))
285 1.1 tonio return EIO;
286 1.1 tonio
287 1.1 tonio /* wait if required */
288 1.4 jdc if (need_delay > 1)
289 1.4 jdc tsleep(&sc->sc_sme, 0, "uthum", (need_delay*hz+999)/1000 + 1);
290 1.1 tonio
291 1.1 tonio /* get answer */
292 1.1 tonio if (uhidev_get_report(&sc->sc_hdev, UHID_FEATURE_REPORT,
293 1.1 tonio report, sc->sc_flen))
294 1.1 tonio return EIO;
295 1.1 tonio memcpy(buf, report, len);
296 1.1 tonio return 0;
297 1.1 tonio }
298 1.1 tonio
299 1.1 tonio int
300 1.1 tonio uthum_check_sensortype(struct uthum_softc *sc)
301 1.1 tonio {
302 1.1 tonio uint8_t buf[8];
303 1.5 jdc static uint8_t sht1x_sig0[] =
304 1.1 tonio { 0x57, 0x5a, 0x13, 0x00, 0x14, 0x00, 0x53, 0x00 };
305 1.5 jdc static uint8_t sht1x_sig1[] =
306 1.5 jdc { 0x57, 0x5a, 0x14, 0x00, 0x14, 0x00, 0x53, 0x00 };
307 1.1 tonio static uint8_t temper_sig[] =
308 1.1 tonio { 0x57, 0x58, 0x14, 0x00, 0x14, 0x00, 0x53, 0x00 };
309 1.1 tonio
310 1.1 tonio if (uthum_read_data(sc, CMD_DEVTYPE, buf, sizeof(buf), 0) != 0) {
311 1.1 tonio DPRINTF(("uthum: read fail\n"));
312 1.1 tonio return UTHUM_TYPE_UNKNOWN;
313 1.1 tonio }
314 1.1 tonio
315 1.1 tonio /*
316 1.1 tonio * currently we have not enough information about the return value,
317 1.1 tonio * therefore, compare full bytes.
318 1.1 tonio * TEMPerHUM HID (SHT1x version) will return:
319 1.1 tonio * { 0x57, 0x5a, 0x13, 0x00, 0x14, 0x00, 0x53, 0x00 }
320 1.5 jdc * { 0x57, 0x5a, 0x14, 0x00, 0x14, 0x00, 0x53, 0x00 }
321 1.5 jdc * TEMPer HID (TEMPer version) will return:
322 1.1 tonio * { 0x57, 0x58, 0x14, 0x00, 0x14, 0x00, 0x53, 0x00 }
323 1.1 tonio */
324 1.5 jdc DPRINTF(("uthum: device signature: "
325 1.5 jdc "0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x\n",
326 1.5 jdc buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]));
327 1.5 jdc if (0 == memcmp(buf, sht1x_sig0, sizeof(sht1x_sig0)))
328 1.5 jdc return UTHUM_TYPE_SHT1x;
329 1.5 jdc if (0 == memcmp(buf, sht1x_sig1, sizeof(sht1x_sig1)))
330 1.1 tonio return UTHUM_TYPE_SHT1x;
331 1.1 tonio if (0 == memcmp(buf, temper_sig, sizeof(temper_sig)))
332 1.1 tonio return UTHUM_TYPE_TEMPER;
333 1.1 tonio
334 1.1 tonio return UTHUM_TYPE_UNKNOWN;
335 1.1 tonio }
336 1.1 tonio
337 1.1 tonio
338 1.1 tonio static void
339 1.1 tonio uthum_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
340 1.1 tonio {
341 1.1 tonio struct uthum_softc *sc = sme->sme_cookie;
342 1.1 tonio uint8_t buf[8];
343 1.5 jdc unsigned int humidity_tick;
344 1.1 tonio int temp, rh;
345 1.1 tonio
346 1.1 tonio switch (sc->sc_sensortype) {
347 1.1 tonio case UTHUM_TYPE_SHT1x:
348 1.1 tonio if (uthum_read_data(sc, CMD_GETDATA, buf, sizeof(buf), 1000) != 0) {
349 1.1 tonio DPRINTF(("uthum: data read fail\n"));
350 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID;
351 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].state = ENVSYS_SINVALID;
352 1.1 tonio return;
353 1.1 tonio }
354 1.5 jdc DPRINTF(("%s: read SHT1x data "
355 1.5 jdc "0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x\n",
356 1.5 jdc sc->sc_sme->sme_name, buf[0], buf[1], buf[2], buf[3],
357 1.5 jdc buf[4], buf[5], buf[6], buf[7]));
358 1.1 tonio
359 1.1 tonio humidity_tick = (buf[2] * 256 + buf[3]) & 0x0fff;
360 1.1 tonio
361 1.5 jdc temp = uthum_sht1x_temp(buf[0], buf[1]);
362 1.1 tonio rh = uthum_sht1x_rh(humidity_tick, temp);
363 1.1 tonio
364 1.3 cnst sc->sc_sensor[UTHUM_HUMIDITY].value_cur = rh / 1000;
365 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].state = ENVSYS_SVALID;
366 1.1 tonio break;
367 1.1 tonio case UTHUM_TYPE_TEMPER:
368 1.1 tonio if (uthum_read_data(sc, CMD_GETTEMP, buf, sizeof(buf), 0) != 0) {
369 1.1 tonio DPRINTF(("uthum: data read fail\n"));
370 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID;
371 1.1 tonio return;
372 1.1 tonio }
373 1.5 jdc DPRINTF(("%s: read TEMPER data "
374 1.5 jdc "0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x\n",
375 1.5 jdc sc->sc_sme->sme_name, buf[0], buf[1], buf[2], buf[3],
376 1.5 jdc buf[4], buf[5], buf[6], buf[7]));
377 1.5 jdc temp = uthum_temper_temp(buf[0], buf[1]);
378 1.1 tonio break;
379 1.1 tonio default:
380 1.1 tonio /* do nothing */
381 1.1 tonio return;
382 1.1 tonio }
383 1.1 tonio
384 1.1 tonio sc->sc_sensor[UTHUM_TEMP].value_cur = (temp * 10000) + 273150000;
385 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SVALID;
386 1.1 tonio }
387 1.1 tonio
388 1.1 tonio /* return C-degree * 100 value */
389 1.1 tonio int
390 1.5 jdc uthum_temper_temp(uint8_t msb, uint8_t lsb)
391 1.1 tonio {
392 1.5 jdc int val;
393 1.5 jdc
394 1.5 jdc val = (msb << 8) | lsb;
395 1.5 jdc if (val >= 32768) {
396 1.5 jdc val = val - 65536;
397 1.5 jdc }
398 1.5 jdc val = (val * 100) >> 8;
399 1.5 jdc return val;
400 1.5 jdc }
401 1.5 jdc
402 1.5 jdc /* return C-degree * 100 value */
403 1.5 jdc int
404 1.5 jdc uthum_sht1x_temp(uint8_t msb, uint8_t lsb)
405 1.5 jdc {
406 1.5 jdc int val;
407 1.5 jdc
408 1.5 jdc val = ((msb << 8) + lsb) - 4096;
409 1.5 jdc return val;
410 1.1 tonio }
411 1.1 tonio
412 1.1 tonio /* return %RH * 1000 */
413 1.1 tonio int
414 1.1 tonio uthum_sht1x_rh(unsigned int ticks, int temp)
415 1.1 tonio {
416 1.1 tonio int rh_l, rh;
417 1.1 tonio
418 1.1 tonio rh_l = (-40000 + 405 * ticks) - ((7 * ticks * ticks) / 250);
419 1.1 tonio rh = ((temp - 2500) * (1 + (ticks >> 7)) + rh_l) / 10;
420 1.1 tonio return rh;
421 1.1 tonio }
422