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/* $NetBSD: axp22x.c,v 1.6 2018/06/26 06:03:57 thorpej Exp $ */
/*-
* Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: axp22x.c,v 1.6 2018/06/26 06:03:57 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kmem.h>
#include <dev/i2c/i2cvar.h>
#include <dev/sysmon/sysmonvar.h>
static const struct device_compatible_entry compat_data[] = {
{ "x-powers,axp221", 0 },
{ NULL, 0 }
};
#define AXP_TEMP_MON_REG 0x56 /* 2 bytes */
struct axp22x_softc {
device_t sc_dev;
i2c_tag_t sc_i2c;
i2c_addr_t sc_addr;
struct sysmon_envsys *sc_sme;
envsys_data_t sc_sensor_temp;
};
static int axp22x_match(device_t, cfdata_t, void *);
static void axp22x_attach(device_t, device_t, void *);
static void axp22x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
static int axp22x_read(struct axp22x_softc *, uint8_t, uint8_t *, size_t);
CFATTACH_DECL_NEW(axp22x, sizeof(struct axp22x_softc),
axp22x_match, axp22x_attach, NULL, NULL);
static int
axp22x_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;
/* This device is direct-config only. */
return 0;
}
static void
axp22x_attach(device_t parent, device_t self, void *aux)
{
struct axp22x_softc *sc = device_private(self);
struct i2c_attach_args *ia = aux;
sc->sc_dev = self;
sc->sc_i2c = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
aprint_naive("\n");
aprint_normal("\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 = axp22x_sensors_refresh;
sc->sc_sensor_temp.units = ENVSYS_STEMP;
sc->sc_sensor_temp.state = ENVSYS_SINVALID;
sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY;
snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc),
"internal temperature");
sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);
sysmon_envsys_register(sc->sc_sme);
}
static void
axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
struct axp22x_softc *sc = sme->sme_cookie;
uint8_t buf[2];
int error;
iic_acquire_bus(sc->sc_i2c, 0);
error = axp22x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf));
iic_release_bus(sc->sc_i2c, 0);
if (error) {
edata->state = ENVSYS_SINVALID;
} else {
/* between -243.7C and 165.8C, step +0.1C */
edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437)
* 100000 + 273150000;
edata->state = ENVSYS_SVALID;
}
}
static int
axp22x_read(struct axp22x_softc *sc, uint8_t reg, uint8_t *val, size_t len)
{
size_t i;
int error;
for (i = 0; i < len; i++) {
error = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr,
reg + i, &val[i], 0);
if (error)
return error;
}
return 0;
}
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