/* $NetBSD: lm95221.c,v 1.1 2026/06/03 11:07:01 jdc Exp $ */ /*- * Copyright (c) 2020 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Julian Coleman. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: lm95221.c,v 1.1 2026/06/03 11:07:01 jdc Exp $"); #include #include #include #include #include #include #include #define LM95221_LOCAL 0 #define LM95221_REMOTE1 1 #define LM95221_REMOTE2 2 #define LM95221_MISSING 0x01 #define LM95221_SIGNED 0x02 struct lm95221ts_softc { device_t sc_dev; i2c_tag_t sc_tag; int sc_address; struct sysmon_envsys *sc_sme; envsys_data_t sc_sensor[LM95221_NSENSORS]; int sc_map[LM95221_NSENSORS]; /* Sysmon numbers to sensors */ uint8_t sc_reg_m[LM95221_NSENSORS]; /* MSB register */ uint8_t sc_reg_l[LM95221_NSENSORS]; /* LSB register */ uint8_t sc_flags[LM95221_NSENSORS]; /* Flags for remotes */ }; static int lm95221ts_match(device_t, cfdata_t, void *); static void lm95221ts_attach(device_t, device_t, void *); static int lm95221ts_detach(device_t, int); void lm95221ts_refresh(struct sysmon_envsys *, envsys_data_t *); static int lm95221ts_read_temp(struct lm95221ts_softc *, uint8_t, uint8_t, uint8_t, uint32_t *); CFATTACH_DECL_NEW(lm95221ts, sizeof(struct lm95221ts_softc), lm95221ts_match, lm95221ts_attach, lm95221ts_detach, NULL); static const struct device_compatible_entry compat_data[] = { { .compat = "i2c-lm95221" }, DEVICE_COMPAT_EOL }; static int lm95221ts_match(device_t parent, cfdata_t cf, void *aux) { struct i2c_attach_args *ia = aux; int match_result; if (iic_use_direct_match(ia, cf, compat_data, &match_result)) return match_result; /* * Indirect config - assume config is correct! */ if (ia->ia_addr == LM95221_ADDR) return I2C_MATCH_ADDRESS_ONLY; return 0; } static void lm95221ts_attach(device_t parent, device_t self, void *aux) { struct lm95221ts_softc *sc = device_private(self); struct i2c_attach_args *ia = aux; uint8_t reg, val; int i, map; sc->sc_tag = ia->ia_tag; sc->sc_address = ia->ia_addr; sc->sc_dev = self; aprint_normal(": LM95221 temperature sensor\n"); /* Read status, start conversion */ for (i = 0; i < LM95221_NSENSORS; i++) sc->sc_flags[i] = 0; if (iic_acquire_bus(sc->sc_tag, 0)) { aprint_error_dev(sc->sc_dev, "unable to acquire i2c bus\n"); return; } reg = LM95221_STATUS; if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, ®, 1, &val, 1, 0)) { aprint_error_dev(sc->sc_dev, "unable to read status register\n"); return; } if (val & LM95221_STAT_NO_REMOTE1) sc->sc_flags[LM95221_REMOTE1] |= LM95221_MISSING; if (val & LM95221_STAT_NO_REMOTE2) sc->sc_flags[LM95221_REMOTE2] |= LM95221_MISSING; reg = LM95221_CONFIG; if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, ®, 1, &val, 1, 0)) { iic_release_bus(sc->sc_tag, 0); aprint_error_dev(sc->sc_dev, "unable to read config register\n"); return; } if (val & LM95221_CONF_REMOTE1) sc->sc_flags[LM95221_REMOTE1] |= LM95221_SIGNED; if (val & LM95221_CONF_REMOTE2) sc->sc_flags[LM95221_REMOTE2] |= LM95221_SIGNED; if (val & LM95221_CONF_STANDBY) { val &= ~(LM95221_CONF_STANDBY); if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, ®, 1, &val, 1, 0)) { aprint_error_dev(sc->sc_dev, "unable to write config register\n"); iic_release_bus(sc->sc_tag, 0); return; } } iic_release_bus(sc->sc_tag, 0); sc->sc_sme = sysmon_envsys_create(); sc->sc_sme->sme_name = device_xname(self); sc->sc_sme->sme_cookie = sc; sc->sc_sme->sme_refresh = lm95221ts_refresh; strlcpy(sc->sc_sensor[LM95221_LOCAL].desc, "local", sizeof(sc->sc_sensor[LM95221_LOCAL].desc)); sc->sc_reg_m[LM95221_LOCAL] = LM95221_LOCAL_MSB; sc->sc_reg_l[LM95221_LOCAL] = LM95221_LOCAL_LSB; strlcpy(sc->sc_sensor[LM95221_REMOTE1].desc, "remote 1", sizeof(sc->sc_sensor[LM95221_REMOTE1].desc)); sc->sc_reg_m[LM95221_REMOTE1] = LM95221_REMOTE1_MSB; sc->sc_reg_l[LM95221_REMOTE1] = LM95221_REMOTE1_LSB; strlcpy(sc->sc_sensor[LM95221_REMOTE2].desc, "remote 2", sizeof(sc->sc_sensor[LM95221_REMOTE2].desc)); sc->sc_reg_m[LM95221_REMOTE2] = LM95221_REMOTE2_MSB; sc->sc_reg_l[LM95221_REMOTE2] = LM95221_REMOTE2_LSB; for (i = 0; i < LM95221_NSENSORS; i++) { if (i == LM95221_REMOTE1 && (sc->sc_flags[LM95221_REMOTE1] & LM95221_MISSING)) continue; if (i == LM95221_REMOTE2 && (sc->sc_flags[LM95221_REMOTE2] & LM95221_MISSING)) continue; sc->sc_sensor[i].units = ENVSYS_STEMP; sc->sc_sensor[i].state = ENVSYS_SINVALID; sc->sc_sensor[i].flags = ENVSYS_FHAS_ENTROPY; if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor[i])) { sysmon_envsys_destroy(sc->sc_sme); sc->sc_sme = NULL; aprint_error_dev(sc->sc_dev, "unable to attach sensor %d to sysmon\n", i); return; } map = sc->sc_sensor[i].sensor; sc->sc_map[map] = i; } if (sysmon_envsys_register(sc->sc_sme)) { aprint_error_dev(self, "unable to register with sysmon\n"); sysmon_envsys_destroy(sc->sc_sme); sc->sc_sme = NULL; return; } } static int lm95221ts_detach(device_t self, int flags) { struct lm95221ts_softc *sc = device_private(self); if (sc->sc_sme != NULL) { sysmon_envsys_unregister(sc->sc_sme); sc->sc_sme = NULL; } return 0; } void lm95221ts_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) { struct lm95221ts_softc *sc = sme->sme_cookie; uint32_t val; uint8_t reg_m, reg_l, flags; int map; map = sc->sc_map[edata->sensor]; reg_m = sc->sc_reg_m[map]; reg_l = sc->sc_reg_l[map]; flags = sc->sc_flags[map]; if (iic_acquire_bus(sc->sc_tag, 0)) return; if (lm95221ts_read_temp(sc, reg_m, reg_l, flags, &val) == 0) { edata->value_cur = val; edata->state = ENVSYS_SVALID; } else { edata->state = ENVSYS_SINVALID; } iic_release_bus(sc->sc_tag, 0); } static int lm95221ts_read_temp(struct lm95221ts_softc *sc, uint8_t reg_m, uint8_t reg_l, uint8_t flags, uint32_t *valp) { uint8_t buf_m, buf_l; int err; err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, ®_m, 1, &buf_m, 1, 0); if (err) return err; err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, ®_l, 1, &buf_l, 1, 0); if (err) return err; /* * Convert the 11 high bits from the 2 bytes to a temperature in uK. * Maybe sign-extend the MSB, and add in the LSB */ if (flags & LM95221_SIGNED) *valp = buf_m; else *valp = (int8_t) buf_m; *valp = (*valp << 3) + ((buf_l >> 5) & 0x07); *valp = *valp * 125000 + 273150000; return 0; }