NetBSD/sys/dev/i2c/adadc.c

258 lines
7.2 KiB
C

/* $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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: adadc.c,v 1.10 2021/01/27 02:29:48 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <dev/i2c/i2cvar.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/ofw/openfirm.h>
/* 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", &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;
}
}