/* $NetBSD: adadc.c,v 1.10 2021/01/27 02:29:48 thorpej Exp $ */ /*- * Copyright (c) 2018 Michael Lorenz * All rights reserved. * * 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. */ /* * a driver for Analog Devices AD7417 temperature sensors / ADCs * very much macppc only for now since we need calibaration data to make sense * of the ADC inputs * info on how to get these from FreeBSD and Linux */ #include __KERNEL_RCSID(0, "$NetBSD: adadc.c,v 1.10 2021/01/27 02:29:48 thorpej Exp $"); #include #include #include #include #include #include #include #include /* commands */ #define ADADC_TEMP 0x00 /* temperature, 16bit */ #define ADADC_CONFIG 0x01 /* 8bit */ #define ADADC_THYST 0x02 /* 16bit */ #define ADADC_TOTI 0x03 /* 16bit, temperature threshold */ #define ADADC_ADC 0x04 /* 16bit, ADC value */ #define ADADC_CONFIG2 0x05 /* 8bit */ /* * registers * ADADC_TEMP has signed temperature in C in first byte, left aligned fraction * in 2nd byte. */ #define ADADC_CFG_CHANNEL_0 0x00 #define ADADC_CFG_CHANNEL_1 0x20 #define ADADC_CFG_CHANNEL_2 0x40 #define ADADC_CFG_CHANNEL_3 0x60 #define ADADC_CFG_CHANNEL_4 0x80 #define ADADC_CFG_CHANNEL_MASK 0xe0 #define ADADC_CFG_FAULT_MASK 0x18 #define ADADC_CFG_OTI_POL 0x04 /* overtemp output polarity */ #define ADADC_CFG_INTMODE 0x02 /* interrupt mode */ #define ADADC_CFG_SHUTDOWN 0x01 /* shutdown mode */ struct adadc_softc { device_t sc_dev; i2c_tag_t sc_i2c; i2c_addr_t sc_addr; struct sysmon_envsys *sc_sme; envsys_data_t sc_sensors[5]; int sc_nsensors; int sc_diode_offset, sc_diode_slope; }; static int adadc_match(device_t, cfdata_t, void *); static void adadc_attach(device_t, device_t, void *); static void adadc_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); CFATTACH_DECL_NEW(adadc, sizeof(struct adadc_softc), adadc_match, adadc_attach, NULL, NULL); static const struct device_compatible_entry compat_data[] = { { .compat = "ad7417" }, DEVICE_COMPAT_EOL }; /* calibaration table from Darwin via Linux */ static int slope[5] = {0, 0, 0x0320, 0x00a0, 0x1f40}; static int adadc_match(device_t parent, cfdata_t match, void *aux) { struct i2c_attach_args *ia = aux; int match_result; if (iic_use_direct_match(ia, match, compat_data, &match_result)) return match_result; /* * XXX * this driver is pretty much useless without OF, should * probably remove this */ if ((ia->ia_addr & 0x2b) == 0x2b) return I2C_MATCH_ADDRESS_ONLY; return 0; } static void adadc_attach(device_t parent, device_t self, void *aux) { struct adadc_softc *sc = device_private(self); struct i2c_attach_args *ia = aux; envsys_data_t *s; int error, ch; uint32_t eeprom[40]; char loc[256]; int which_cpu; sc->sc_dev = self; sc->sc_i2c = ia->ia_tag; sc->sc_addr = ia->ia_addr; aprint_naive("\n"); aprint_normal(": AD7417\n"); 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 = adadc_sensors_refresh; sc->sc_nsensors = 0; /* * XXX * without OpenFirmware telling us how to interpret the ADC inputs we * should probably just expose the temperature and four ENVSYS_INTEGERs */ which_cpu = 0; ch = OF_child(ia->ia_cookie); while (ch != 0) { if (OF_getprop(ch, "location", loc, 32) > 0) { int reg = 0; OF_getprop(ch, "reg", ®, sizeof(reg)); s = &sc->sc_sensors[sc->sc_nsensors]; s->state = ENVSYS_SINVALID; /* * this setup matches my 2x 2.5GHz PCI-X G5, Linux and * FreeBSD hardcode these as well so we should be safe */ switch (reg) { case 0: if (strstr(loc, "CPU B") != NULL) which_cpu = 1; /* FALLTHROUGH */ case 1: s->units = ENVSYS_STEMP; break; case 2: case 4: s->units = ENVSYS_SAMPS; break; case 3: s->units = ENVSYS_SVOLTS_DC; break; default: s->units = ENVSYS_INTEGER; } strncpy(s->desc, loc, sizeof(s->desc)); s->private = reg; sysmon_envsys_sensor_attach(sc->sc_sme, s); sc->sc_nsensors++; } ch = OF_peer(ch); } aprint_debug_dev(self, "monitoring CPU %d\n", which_cpu); error = get_cpuid(which_cpu, (uint8_t *)eeprom); if (error >= 0) { sc->sc_diode_slope = eeprom[0x11] >> 16; sc->sc_diode_offset = (int16_t)(eeprom[0x11] & 0xffff) << 12; } sysmon_envsys_register(sc->sc_sme); } static void adadc_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) { struct adadc_softc *sc = sme->sme_cookie; uint8_t cmd = ADADC_CONFIG; int16_t data = 0; uint16_t rdata; uint8_t cfg; int error, ch; iic_acquire_bus(sc->sc_i2c, 0); if (edata->private > 0) { error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, &cmd, 1, &cfg, 1, 0); ch = cfg >> 5; /* are we on the right channel already? */ if (ch != edata->private) { /* nope */ cfg &= 0x1f; cfg |= (edata->private & 7) << 5; iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, &cmd, 1, &cfg, 1, 0); } cmd = ADADC_ADC; /* now read the ADC register */ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, &cmd, 1, &rdata, 2, 0); rdata = be16toh(rdata) >> 6; if (edata->private == 1) { int temp; temp = (rdata * sc->sc_diode_slope + sc->sc_diode_offset) >> 2; /* 16.16 fixed point */ edata->value_cur = (temp >> 12) * 62500 + 273150000; } else { /* * the input is 10bit, so converting to 8.4 fixed point * is more than enough */ int temp = rdata * slope[edata->private]; edata->value_cur = (temp >> 12) * 62500; } } else { cmd = ADADC_TEMP; /* just read the temperature register */ error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr, &cmd, 1, &data, 2, 0); /* 8.2 bit fixed point Celsius -> microkelvin */ edata->value_cur = ((data >> 6) * 250000) + 273150000; } iic_release_bus(sc->sc_i2c, 0); if (error) { edata->state = ENVSYS_SINVALID; } else { edata->state = ENVSYS_SVALID; } }