258 lines
7.2 KiB
C
258 lines
7.2 KiB
C
/* $NetBSD: adadc.c,v 1.10 2021/01/27 02:29:48 thorpej Exp $ */
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/*-
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* Copyright (c) 2018 Michael Lorenz
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* a driver for Analog Devices AD7417 temperature sensors / ADCs
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* very much macppc only for now since we need calibaration data to make sense
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* of the ADC inputs
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* info on how to get these from FreeBSD and Linux
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: adadc.c,v 1.10 2021/01/27 02:29:48 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <dev/ofw/openfirm.h>
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/* commands */
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#define ADADC_TEMP 0x00 /* temperature, 16bit */
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#define ADADC_CONFIG 0x01 /* 8bit */
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#define ADADC_THYST 0x02 /* 16bit */
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#define ADADC_TOTI 0x03 /* 16bit, temperature threshold */
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#define ADADC_ADC 0x04 /* 16bit, ADC value */
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#define ADADC_CONFIG2 0x05 /* 8bit */
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/*
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* registers
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* ADADC_TEMP has signed temperature in C in first byte, left aligned fraction
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* in 2nd byte.
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*/
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#define ADADC_CFG_CHANNEL_0 0x00
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#define ADADC_CFG_CHANNEL_1 0x20
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#define ADADC_CFG_CHANNEL_2 0x40
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#define ADADC_CFG_CHANNEL_3 0x60
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#define ADADC_CFG_CHANNEL_4 0x80
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#define ADADC_CFG_CHANNEL_MASK 0xe0
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#define ADADC_CFG_FAULT_MASK 0x18
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#define ADADC_CFG_OTI_POL 0x04 /* overtemp output polarity */
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#define ADADC_CFG_INTMODE 0x02 /* interrupt mode */
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#define ADADC_CFG_SHUTDOWN 0x01 /* shutdown mode */
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struct adadc_softc {
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device_t sc_dev;
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i2c_tag_t sc_i2c;
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i2c_addr_t sc_addr;
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struct sysmon_envsys *sc_sme;
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envsys_data_t sc_sensors[5];
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int sc_nsensors;
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int sc_diode_offset, sc_diode_slope;
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};
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static int adadc_match(device_t, cfdata_t, void *);
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static void adadc_attach(device_t, device_t, void *);
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static void adadc_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
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CFATTACH_DECL_NEW(adadc, sizeof(struct adadc_softc),
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adadc_match, adadc_attach, NULL, NULL);
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "ad7417" },
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DEVICE_COMPAT_EOL
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};
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/* calibaration table from Darwin via Linux */
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static int slope[5] = {0, 0, 0x0320, 0x00a0, 0x1f40};
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static int
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adadc_match(device_t parent, cfdata_t match, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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int match_result;
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if (iic_use_direct_match(ia, match, compat_data, &match_result))
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return match_result;
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/*
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* XXX
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* this driver is pretty much useless without OF, should
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* probably remove this
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*/
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if ((ia->ia_addr & 0x2b) == 0x2b)
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return I2C_MATCH_ADDRESS_ONLY;
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return 0;
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}
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static void
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adadc_attach(device_t parent, device_t self, void *aux)
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{
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struct adadc_softc *sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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envsys_data_t *s;
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int error, ch;
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uint32_t eeprom[40];
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char loc[256];
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int which_cpu;
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sc->sc_dev = self;
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sc->sc_i2c = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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aprint_naive("\n");
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aprint_normal(": AD7417\n");
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sc->sc_sme = sysmon_envsys_create();
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sc->sc_sme->sme_name = device_xname(self);
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sc->sc_sme->sme_cookie = sc;
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sc->sc_sme->sme_refresh = adadc_sensors_refresh;
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sc->sc_nsensors = 0;
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/*
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* XXX
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* without OpenFirmware telling us how to interpret the ADC inputs we
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* should probably just expose the temperature and four ENVSYS_INTEGERs
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*/
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which_cpu = 0;
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ch = OF_child(ia->ia_cookie);
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while (ch != 0) {
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if (OF_getprop(ch, "location", loc, 32) > 0) {
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int reg = 0;
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OF_getprop(ch, "reg", ®, sizeof(reg));
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s = &sc->sc_sensors[sc->sc_nsensors];
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s->state = ENVSYS_SINVALID;
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/*
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* this setup matches my 2x 2.5GHz PCI-X G5, Linux and
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* FreeBSD hardcode these as well so we should be safe
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*/
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switch (reg) {
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case 0:
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if (strstr(loc, "CPU B") != NULL)
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which_cpu = 1;
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/* FALLTHROUGH */
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case 1:
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s->units = ENVSYS_STEMP;
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break;
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case 2:
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case 4:
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s->units = ENVSYS_SAMPS;
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break;
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case 3:
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s->units = ENVSYS_SVOLTS_DC;
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break;
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default:
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s->units = ENVSYS_INTEGER;
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}
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strncpy(s->desc, loc, sizeof(s->desc));
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s->private = reg;
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sysmon_envsys_sensor_attach(sc->sc_sme, s);
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sc->sc_nsensors++;
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}
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ch = OF_peer(ch);
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}
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aprint_debug_dev(self, "monitoring CPU %d\n", which_cpu);
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error = get_cpuid(which_cpu, (uint8_t *)eeprom);
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if (error >= 0) {
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sc->sc_diode_slope = eeprom[0x11] >> 16;
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sc->sc_diode_offset = (int16_t)(eeprom[0x11] & 0xffff) << 12;
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}
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sysmon_envsys_register(sc->sc_sme);
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}
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static void
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adadc_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
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{
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struct adadc_softc *sc = sme->sme_cookie;
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uint8_t cmd = ADADC_CONFIG;
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int16_t data = 0;
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uint16_t rdata;
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uint8_t cfg;
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int error, ch;
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iic_acquire_bus(sc->sc_i2c, 0);
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if (edata->private > 0) {
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error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
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sc->sc_addr, &cmd, 1, &cfg, 1, 0);
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ch = cfg >> 5;
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/* are we on the right channel already? */
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if (ch != edata->private) {
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/* nope */
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cfg &= 0x1f;
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cfg |= (edata->private & 7) << 5;
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iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP,
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sc->sc_addr, &cmd, 1, &cfg, 1, 0);
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}
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cmd = ADADC_ADC;
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/* now read the ADC register */
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error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
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sc->sc_addr, &cmd, 1, &rdata, 2, 0);
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rdata = be16toh(rdata) >> 6;
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if (edata->private == 1) {
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int temp;
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temp = (rdata * sc->sc_diode_slope +
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sc->sc_diode_offset) >> 2;
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/* 16.16 fixed point */
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edata->value_cur = (temp >> 12) * 62500 + 273150000;
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} else {
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/*
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* the input is 10bit, so converting to 8.4 fixed point
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* is more than enough
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*/
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int temp = rdata * slope[edata->private];
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edata->value_cur = (temp >> 12) * 62500;
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}
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} else {
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cmd = ADADC_TEMP;
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/* just read the temperature register */
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error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP,
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sc->sc_addr, &cmd, 1, &data, 2, 0);
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/* 8.2 bit fixed point Celsius -> microkelvin */
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edata->value_cur = ((data >> 6) * 250000) + 273150000;
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}
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iic_release_bus(sc->sc_i2c, 0);
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if (error) {
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edata->state = ENVSYS_SINVALID;
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} else {
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edata->state = ENVSYS_SVALID;
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}
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}
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