146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/* $NetBSD: axp22x.c,v 1.8 2021/01/25 13:30:20 thorpej Exp $ */
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/*-
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* Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: axp22x.c,v 1.8 2021/01/25 13:30:20 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 <sys/kmem.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/sysmon/sysmonvar.h>
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "x-powers,axp221" },
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{ }
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};
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#define AXP_TEMP_MON_REG 0x56 /* 2 bytes */
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struct axp22x_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_sensor_temp;
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};
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static int axp22x_match(device_t, cfdata_t, void *);
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static void axp22x_attach(device_t, device_t, void *);
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static void axp22x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
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static int axp22x_read(struct axp22x_softc *, uint8_t, uint8_t *, size_t);
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CFATTACH_DECL_NEW(axp22x, sizeof(struct axp22x_softc),
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axp22x_match, axp22x_attach, NULL, NULL);
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static int
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axp22x_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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/* This device is direct-config only. */
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return 0;
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}
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static void
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axp22x_attach(device_t parent, device_t self, void *aux)
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{
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struct axp22x_softc *sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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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("\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 = axp22x_sensors_refresh;
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sc->sc_sensor_temp.units = ENVSYS_STEMP;
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sc->sc_sensor_temp.state = ENVSYS_SINVALID;
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sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY;
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snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc),
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"internal temperature");
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sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp);
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sysmon_envsys_register(sc->sc_sme);
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}
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static void
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axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
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{
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struct axp22x_softc *sc = sme->sme_cookie;
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uint8_t buf[2];
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int error;
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iic_acquire_bus(sc->sc_i2c, 0);
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error = axp22x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf));
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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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/* between -243.7C and 165.8C, step +0.1C */
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edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437)
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* 100000 + 273150000;
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edata->state = ENVSYS_SVALID;
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}
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}
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static int
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axp22x_read(struct axp22x_softc *sc, uint8_t reg, uint8_t *val, size_t len)
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{
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size_t i;
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int error;
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for (i = 0; i < len; i++) {
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error = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr,
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reg + i, &val[i], 0);
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if (error)
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return error;
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}
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return 0;
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}
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