AXP20x Power Management Unit driver, pretty basic at the moment -- only acts as a temperature sensor
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jmcneill
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23897eff59
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/* $NetBSD: axp20x.c,v 1.1 2014/09/09 22:47:33 jmcneill 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: axp20x.c,v 1.1 2014/09/09 22:47:33 jmcneill 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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#define AXP_TEMP_MON_REG 0x5e /* 2 bytes */
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struct axp20x_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 axp20x_match(device_t, cfdata_t, void *);
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static void axp20x_attach(device_t, device_t, void *);
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static void axp20x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *);
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static int axp20x_read(struct axp20x_softc *, uint8_t, uint8_t *, size_t);
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CFATTACH_DECL_NEW(axp20x, sizeof(struct axp20x_softc),
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axp20x_match, axp20x_attach, NULL, NULL);
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static int
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axp20x_match(device_t parent, cfdata_t match, void *aux)
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{
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return 1;
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}
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static void
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axp20x_attach(device_t parent, device_t self, void *aux)
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{
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struct axp20x_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 = axp20x_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),
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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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axp20x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
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{
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struct axp20x_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 = axp20x_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 -144.7C and 264.8C, step +0.1C */
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edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 1447)
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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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axp20x_read(struct axp20x_softc *sc, uint8_t reg, uint8_t *val, size_t len)
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{
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return iic_smbus_block_read(sc->sc_i2c, sc->sc_addr,
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reg, val, len, 0);
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}
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@ -1,4 +1,4 @@
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# $NetBSD: files.i2c,v 1.55 2014/09/09 22:44:32 jmcneill Exp $
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# $NetBSD: files.i2c,v 1.56 2014/09/09 22:47:33 jmcneill Exp $
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obsolete defflag opt_i2cbus.h I2C_SCAN
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define i2cbus { }
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@ -215,3 +215,7 @@ device mpl115a: sysmon_envsys
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attach mpl115a at iic
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file dev/i2c/mpl115a.c mpl115a
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# AXP20x Power Management Unit
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device axp20x: sysmon_envsys
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attach axp20x at iic
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file dev/i2c/axp20x.c axp20x
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