1 1.23 riastrad /* $NetBSD: uthum.c,v 1.23 2022/03/28 12:44:17 riastradh 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 1.23 riastrad __KERNEL_RCSID(0, "$NetBSD: uthum.c,v 1.23 2022/03/28 12:44:17 riastradh Exp $"); 26 1.13 skrll 27 1.13 skrll #ifdef _KERNEL_OPT 28 1.13 skrll #include "opt_usb.h" 29 1.13 skrll #endif 30 1.1 tonio 31 1.1 tonio #include <sys/param.h> 32 1.1 tonio #include <sys/proc.h> 33 1.1 tonio #include <sys/systm.h> 34 1.1 tonio #include <sys/kernel.h> 35 1.1 tonio #include <sys/device.h> 36 1.1 tonio #include <sys/conf.h> 37 1.1 tonio 38 1.1 tonio #include <dev/sysmon/sysmonvar.h> 39 1.1 tonio 40 1.1 tonio #include <dev/usb/usb.h> 41 1.1 tonio #include <dev/usb/usbhid.h> 42 1.1 tonio #include <dev/usb/usbdi.h> 43 1.1 tonio #include <dev/usb/usbdi_util.h> 44 1.1 tonio #include <dev/usb/usbdevs.h> 45 1.1 tonio #include <dev/usb/uhidev.h> 46 1.14 bouyer #include <dev/hid/hid.h> 47 1.1 tonio 48 1.1 tonio #ifdef UTHUM_DEBUG 49 1.1 tonio int uthumdebug = 0; 50 1.1 tonio #define DPRINTFN(n, x) do { if (uthumdebug > (n)) printf x; } while (0) 51 1.1 tonio #else 52 1.1 tonio #define DPRINTFN(n, x) 53 1.1 tonio #endif 54 1.1 tonio 55 1.1 tonio #define DPRINTF(x) DPRINTFN(0, x) 56 1.1 tonio 57 1.1 tonio 58 1.1 tonio /* TEMPerHUM */ 59 1.1 tonio #define CMD_DEVTYPE 0x52 /* XXX */ 60 1.1 tonio #define CMD_GETDATA 0x48 /* XXX */ 61 1.1 tonio #define CMD_GETTEMP 0x54 /* XXX */ 62 1.17 maxv static const uint8_t cmd_start[8] = 63 1.1 tonio { 0x0a, 0x0b, 0x0c, 0x0d, 0x00, 0x00, 0x02, 0x00 }; 64 1.17 maxv static const uint8_t cmd_end[8] = 65 1.1 tonio { 0x0a, 0x0b, 0x0c, 0x0d, 0x00, 0x00, 0x01, 0x00 }; 66 1.1 tonio 67 1.1 tonio /* sensors */ 68 1.1 tonio #define UTHUM_TEMP 0 69 1.1 tonio #define UTHUM_HUMIDITY 1 70 1.1 tonio #define UTHUM_MAX_SENSORS 2 71 1.1 tonio 72 1.1 tonio #define UTHUM_TYPE_UNKNOWN 0 73 1.1 tonio #define UTHUM_TYPE_SHT1x 1 74 1.1 tonio #define UTHUM_TYPE_TEMPER 2 75 1.1 tonio 76 1.1 tonio struct uthum_softc { 77 1.23 riastrad device_t sc_dev; 78 1.23 riastrad struct uhidev * sc_hdev; 79 1.11 skrll struct usbd_device * sc_udev; 80 1.1 tonio u_char sc_dying; 81 1.1 tonio uint16_t sc_flag; 82 1.1 tonio int sc_sensortype; 83 1.1 tonio 84 1.1 tonio /* uhidev parameters */ 85 1.1 tonio size_t sc_flen; /* feature report length */ 86 1.1 tonio size_t sc_olen; /* output report length */ 87 1.1 tonio 88 1.1 tonio /* sensor framework */ 89 1.1 tonio struct sysmon_envsys *sc_sme; 90 1.1 tonio envsys_data_t sc_sensor[UTHUM_MAX_SENSORS]; 91 1.1 tonio 92 1.1 tonio uint8_t sc_num_sensors; 93 1.1 tonio }; 94 1.1 tonio 95 1.1 tonio 96 1.17 maxv static const struct usb_devno uthum_devs[] = { 97 1.1 tonio /* XXX: various TEMPer variants using same VID/PID */ 98 1.1 tonio { USB_VENDOR_TENX, USB_PRODUCT_TENX_TEMPER}, 99 1.1 tonio }; 100 1.1 tonio #define uthum_lookup(v, p) usb_lookup(uthum_devs, v, p) 101 1.1 tonio 102 1.17 maxv static int uthum_match(device_t, cfdata_t, void *); 103 1.17 maxv static void uthum_attach(device_t, device_t, void *); 104 1.17 maxv static int uthum_detach(device_t, int); 105 1.17 maxv static int uthum_activate(device_t, enum devact); 106 1.17 maxv 107 1.17 maxv static int uthum_read_data(struct uthum_softc *, uint8_t, uint8_t *, size_t, int); 108 1.17 maxv static int uthum_check_sensortype(struct uthum_softc *); 109 1.17 maxv static int uthum_temper_temp(uint8_t, uint8_t); 110 1.17 maxv static int uthum_sht1x_temp(uint8_t, uint8_t); 111 1.17 maxv static int uthum_sht1x_rh(unsigned int, int); 112 1.1 tonio 113 1.1 tonio static void uthum_refresh(struct sysmon_envsys *, envsys_data_t *); 114 1.1 tonio 115 1.16 mrg 116 1.1 tonio CFATTACH_DECL_NEW(uthum, sizeof(struct uthum_softc), uthum_match, uthum_attach, 117 1.1 tonio uthum_detach, uthum_activate); 118 1.1 tonio 119 1.17 maxv static int 120 1.6 dyoung uthum_match(device_t parent, cfdata_t match, void *aux) 121 1.1 tonio { 122 1.11 skrll struct uhidev_attach_arg *uha = aux; 123 1.1 tonio 124 1.12 msaitoh return uthum_lookup(uha->uiaa->uiaa_vendor, uha->uiaa->uiaa_product) 125 1.12 msaitoh != NULL ? UMATCH_VENDOR_PRODUCT : UMATCH_NONE; 126 1.1 tonio } 127 1.1 tonio 128 1.17 maxv static void 129 1.6 dyoung uthum_attach(device_t parent, device_t self, void *aux) 130 1.1 tonio { 131 1.6 dyoung struct uthum_softc *sc = device_private(self); 132 1.11 skrll struct uhidev_attach_arg *uha = aux; 133 1.22 riastrad struct usbd_device *dev = uha->uiaa->uiaa_device; 134 1.1 tonio int size, repid; 135 1.1 tonio void *desc; 136 1.1 tonio 137 1.23 riastrad sc->sc_dev = self; 138 1.23 riastrad sc->sc_hdev = uha->parent; 139 1.1 tonio sc->sc_udev = dev; 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_olen = hid_report_size(desc, size, hid_output, repid); 148 1.1 tonio sc->sc_flen = hid_report_size(desc, size, hid_feature, repid); 149 1.1 tonio 150 1.23 riastrad usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev); 151 1.1 tonio 152 1.1 tonio if (sc->sc_flen < 32) { 153 1.1 tonio /* not sensor interface, just attach */ 154 1.1 tonio return; 155 1.1 tonio } 156 1.1 tonio 157 1.1 tonio sc->sc_sensortype = uthum_check_sensortype(sc); 158 1.1 tonio 159 1.1 tonio /* attach sensor */ 160 1.1 tonio sc->sc_sme = sysmon_envsys_create(); 161 1.1 tonio sc->sc_sme->sme_name = device_xname(self); 162 1.1 tonio 163 1.1 tonio switch (sc->sc_sensortype) { 164 1.1 tonio case UTHUM_TYPE_SHT1x: 165 1.1 tonio (void)strlcpy(sc->sc_sensor[UTHUM_TEMP].desc, "temp", 166 1.1 tonio sizeof(sc->sc_sensor[UTHUM_TEMP].desc)); 167 1.1 tonio sc->sc_sensor[UTHUM_TEMP].units = ENVSYS_STEMP; 168 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID; 169 1.1 tonio 170 1.3 cnst (void)strlcpy(sc->sc_sensor[UTHUM_HUMIDITY].desc, 171 1.3 cnst "relative humidity", 172 1.1 tonio sizeof(sc->sc_sensor[UTHUM_HUMIDITY].desc)); 173 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].units = ENVSYS_INTEGER; 174 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].value_cur = 0; 175 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].state = ENVSYS_SINVALID; 176 1.1 tonio 177 1.12 msaitoh sysmon_envsys_sensor_attach(sc->sc_sme, 178 1.12 msaitoh &sc->sc_sensor[UTHUM_TEMP]); 179 1.12 msaitoh sysmon_envsys_sensor_attach(sc->sc_sme, 180 1.12 msaitoh &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 1.12 msaitoh sysmon_envsys_sensor_attach(sc->sc_sme, 191 1.12 msaitoh &sc->sc_sensor[UTHUM_TEMP]); 192 1.1 tonio sc->sc_num_sensors = 1; 193 1.1 tonio DPRINTF(("sensor type: TEMPer\n")); 194 1.1 tonio break; 195 1.1 tonio case UTHUM_TYPE_UNKNOWN: 196 1.1 tonio DPRINTF(("sensor type: unknown, give up to attach sensors\n")); 197 1.1 tonio default: 198 1.1 tonio break; 199 1.1 tonio } 200 1.1 tonio 201 1.1 tonio if (sc->sc_num_sensors > 0) { 202 1.1 tonio sc->sc_sme->sme_cookie = sc; 203 1.1 tonio sc->sc_sme->sme_refresh = uthum_refresh; 204 1.1 tonio 205 1.1 tonio if (sysmon_envsys_register(sc->sc_sme)) { 206 1.21 mlelstv sysmon_envsys_destroy(sc->sc_sme); 207 1.21 mlelstv sc->sc_sme = NULL; 208 1.12 msaitoh aprint_error_dev(self, 209 1.12 msaitoh "unable to register with sysmon\n"); 210 1.1 tonio } 211 1.1 tonio } else { 212 1.1 tonio sysmon_envsys_destroy(sc->sc_sme); 213 1.21 mlelstv sc->sc_sme = NULL; 214 1.1 tonio } 215 1.1 tonio 216 1.1 tonio DPRINTF(("uthum_attach: complete\n")); 217 1.1 tonio } 218 1.1 tonio 219 1.17 maxv static int 220 1.6 dyoung uthum_detach(device_t self, int flags) 221 1.1 tonio { 222 1.6 dyoung struct uthum_softc *sc = device_private(self); 223 1.1 tonio int rv = 0; 224 1.1 tonio 225 1.1 tonio sc->sc_dying = 1; 226 1.1 tonio 227 1.21 mlelstv if (sc->sc_sme != NULL) 228 1.1 tonio sysmon_envsys_unregister(sc->sc_sme); 229 1.1 tonio 230 1.23 riastrad usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev); 231 1.1 tonio 232 1.11 skrll return rv; 233 1.1 tonio } 234 1.1 tonio 235 1.17 maxv static int 236 1.1 tonio uthum_activate(device_t self, enum devact act) 237 1.1 tonio { 238 1.1 tonio struct uthum_softc *sc = device_private(self); 239 1.1 tonio 240 1.1 tonio switch (act) { 241 1.1 tonio case DVACT_DEACTIVATE: 242 1.1 tonio sc->sc_dying = 1; 243 1.1 tonio break; 244 1.1 tonio } 245 1.11 skrll return 0; 246 1.1 tonio } 247 1.1 tonio 248 1.17 maxv static int 249 1.1 tonio uthum_read_data(struct uthum_softc *sc, uint8_t target_cmd, uint8_t *buf, 250 1.4 jdc size_t len, int need_delay) 251 1.1 tonio { 252 1.1 tonio int i; 253 1.1 tonio uint8_t cmdbuf[32], report[256]; 254 1.18 maxv size_t olen, flen; 255 1.1 tonio 256 1.1 tonio /* if return buffer is null, do nothing */ 257 1.1 tonio if ((buf == NULL) || len == 0) 258 1.1 tonio return 0; 259 1.1 tonio 260 1.18 maxv olen = uimin(sc->sc_olen, sizeof(cmdbuf)); 261 1.18 maxv 262 1.1 tonio /* issue query */ 263 1.11 skrll memset(cmdbuf, 0, sizeof(cmdbuf)); 264 1.1 tonio memcpy(cmdbuf, cmd_start, sizeof(cmd_start)); 265 1.23 riastrad if (uhidev_set_report(sc->sc_hdev, UHID_OUTPUT_REPORT, 266 1.18 maxv cmdbuf, olen)) 267 1.1 tonio return EIO; 268 1.1 tonio 269 1.11 skrll memset(cmdbuf, 0, sizeof(cmdbuf)); 270 1.1 tonio cmdbuf[0] = target_cmd; 271 1.23 riastrad if (uhidev_set_report(sc->sc_hdev, UHID_OUTPUT_REPORT, 272 1.18 maxv cmdbuf, olen)) 273 1.1 tonio return EIO; 274 1.1 tonio 275 1.11 skrll memset(cmdbuf, 0, sizeof(cmdbuf)); 276 1.1 tonio for (i = 0; i < 7; i++) { 277 1.23 riastrad if (uhidev_set_report(sc->sc_hdev, UHID_OUTPUT_REPORT, 278 1.18 maxv cmdbuf, olen)) 279 1.1 tonio return EIO; 280 1.1 tonio } 281 1.1 tonio memcpy(cmdbuf, cmd_end, sizeof(cmd_end)); 282 1.23 riastrad if (uhidev_set_report(sc->sc_hdev, UHID_OUTPUT_REPORT, 283 1.18 maxv cmdbuf, olen)) 284 1.1 tonio return EIO; 285 1.1 tonio 286 1.1 tonio /* wait if required */ 287 1.4 jdc if (need_delay > 1) 288 1.15 skrll kpause("uthum", false, (need_delay*hz+999)/1000 + 1, NULL); 289 1.1 tonio 290 1.1 tonio /* get answer */ 291 1.18 maxv flen = uimin(sc->sc_flen, sizeof(report)); 292 1.23 riastrad if (uhidev_get_report(sc->sc_hdev, UHID_FEATURE_REPORT, 293 1.18 maxv report, 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 1.17 maxv static 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 1.20 christos "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 1.12 msaitoh if (uthum_read_data(sc, CMD_GETDATA, buf, sizeof(buf), 1000) 349 1.12 msaitoh != 0) { 350 1.1 tonio DPRINTF(("uthum: data read fail\n")); 351 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID; 352 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].state = ENVSYS_SINVALID; 353 1.1 tonio return; 354 1.1 tonio } 355 1.5 jdc DPRINTF(("%s: read SHT1x data " 356 1.20 christos "0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x\n", 357 1.5 jdc sc->sc_sme->sme_name, buf[0], buf[1], buf[2], buf[3], 358 1.5 jdc buf[4], buf[5], buf[6], buf[7])); 359 1.1 tonio 360 1.1 tonio humidity_tick = (buf[2] * 256 + buf[3]) & 0x0fff; 361 1.1 tonio 362 1.5 jdc temp = uthum_sht1x_temp(buf[0], buf[1]); 363 1.1 tonio rh = uthum_sht1x_rh(humidity_tick, temp); 364 1.1 tonio 365 1.3 cnst sc->sc_sensor[UTHUM_HUMIDITY].value_cur = rh / 1000; 366 1.1 tonio sc->sc_sensor[UTHUM_HUMIDITY].state = ENVSYS_SVALID; 367 1.1 tonio break; 368 1.1 tonio case UTHUM_TYPE_TEMPER: 369 1.1 tonio if (uthum_read_data(sc, CMD_GETTEMP, buf, sizeof(buf), 0) != 0) { 370 1.1 tonio DPRINTF(("uthum: data read fail\n")); 371 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SINVALID; 372 1.1 tonio return; 373 1.1 tonio } 374 1.5 jdc DPRINTF(("%s: read TEMPER data " 375 1.20 christos "0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x 0x%0x\n", 376 1.5 jdc sc->sc_sme->sme_name, buf[0], buf[1], buf[2], buf[3], 377 1.5 jdc buf[4], buf[5], buf[6], buf[7])); 378 1.5 jdc temp = uthum_temper_temp(buf[0], buf[1]); 379 1.1 tonio break; 380 1.1 tonio default: 381 1.1 tonio /* do nothing */ 382 1.1 tonio return; 383 1.1 tonio } 384 1.1 tonio 385 1.1 tonio sc->sc_sensor[UTHUM_TEMP].value_cur = (temp * 10000) + 273150000; 386 1.1 tonio sc->sc_sensor[UTHUM_TEMP].state = ENVSYS_SVALID; 387 1.1 tonio } 388 1.1 tonio 389 1.1 tonio /* return C-degree * 100 value */ 390 1.17 maxv static int 391 1.5 jdc uthum_temper_temp(uint8_t msb, uint8_t lsb) 392 1.1 tonio { 393 1.5 jdc int val; 394 1.5 jdc 395 1.5 jdc val = (msb << 8) | lsb; 396 1.5 jdc if (val >= 32768) { 397 1.5 jdc val = val - 65536; 398 1.5 jdc } 399 1.5 jdc val = (val * 100) >> 8; 400 1.5 jdc return val; 401 1.5 jdc } 402 1.5 jdc 403 1.5 jdc /* return C-degree * 100 value */ 404 1.17 maxv static int 405 1.5 jdc uthum_sht1x_temp(uint8_t msb, uint8_t lsb) 406 1.5 jdc { 407 1.5 jdc int val; 408 1.5 jdc 409 1.5 jdc val = ((msb << 8) + lsb) - 4096; 410 1.5 jdc return val; 411 1.1 tonio } 412 1.1 tonio 413 1.1 tonio /* return %RH * 1000 */ 414 1.17 maxv static int 415 1.1 tonio uthum_sht1x_rh(unsigned int ticks, int temp) 416 1.1 tonio { 417 1.1 tonio int rh_l, rh; 418 1.1 tonio 419 1.1 tonio rh_l = (-40000 + 405 * ticks) - ((7 * ticks * ticks) / 250); 420 1.1 tonio rh = ((temp - 2500) * (1 + (ticks >> 7)) + rh_l) / 10; 421 1.1 tonio return rh; 422 1.1 tonio } 423