147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/* $NetBSD: tmp121.c,v 1.3 2007/11/16 08:00:16 xtraeme Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2006 Urbana-Champaign Independent Media Center.
|
|
* Copyright (c) 2006 Garrett D'Amore.
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this code were written by Garrett D'Amore for the
|
|
* Champaign-Urbana Community Wireless Network Project.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this
|
|
* software must display the following acknowledgements:
|
|
* This product includes software developed by the Urbana-Champaign
|
|
* Independent Media Center.
|
|
* This product includes software developed by Garrett D'Amore.
|
|
* 4. Urbana-Champaign Independent Media Center's name and Garrett
|
|
* D'Amore's name may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
|
|
* MEDIA CENTER AND GARRETT D'AMORE ``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 URBANA-CHAMPAIGN INDEPENDENT
|
|
* MEDIA CENTER OR GARRETT D'AMORE 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: tmp121.c,v 1.3 2007/11/16 08:00:16 xtraeme Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/device.h>
|
|
#include <sys/kernel.h>
|
|
|
|
#include <dev/sysmon/sysmonvar.h>
|
|
|
|
#include <dev/spi/spivar.h>
|
|
|
|
struct tmp121temp_softc {
|
|
struct device sc_dev;
|
|
|
|
struct spi_handle *sc_sh;
|
|
|
|
struct sysmon_envsys *sc_sme;
|
|
envsys_data_t sc_sensor;
|
|
};
|
|
|
|
static int tmp121temp_match(struct device *, struct cfdata *, void *);
|
|
static void tmp121temp_attach(struct device *, struct device *, void *);
|
|
|
|
static void tmp121temp_refresh(struct sysmon_envsys *, envsys_data_t *);
|
|
|
|
CFATTACH_DECL(tmp121temp, sizeof(struct tmp121temp_softc),
|
|
tmp121temp_match, tmp121temp_attach, NULL, NULL);
|
|
|
|
static int
|
|
tmp121temp_match(struct device *parent, struct cfdata *cf, void *aux)
|
|
{
|
|
struct spi_attach_args *sa = aux;
|
|
|
|
/* configure for 10MHz */
|
|
if (spi_configure(sa->sa_handle, SPI_MODE_0, 1000000))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
tmp121temp_attach(struct device *parent, struct device *self, void *aux)
|
|
{
|
|
struct tmp121temp_softc *sc = device_private(self);
|
|
struct spi_attach_args *sa = aux;
|
|
|
|
aprint_naive(": Temperature Sensor\n");
|
|
aprint_normal(": TI TMP121 Temperature Sensor\n");
|
|
|
|
sc->sc_sh = sa->sa_handle;
|
|
|
|
sc->sc_sme = sysmon_envsys_create();
|
|
sc->sc_sensor.units = ENVSYS_STEMP;
|
|
strlcpy(sc->sc_sensor.desc, device_xname(self),
|
|
sizeof(sc->sc_sensor.desc));
|
|
if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
|
|
sysmon_envsys_destroy(sc->sc_sme);
|
|
return;
|
|
}
|
|
|
|
sc->sc_sme->sme_name = device_xname(self);
|
|
sc->sc_sme->sme_refresh = tmp121temp_refresh;
|
|
sc->sc_sme->sme_cookie = sc;
|
|
|
|
if (sysmon_envsys_register(sc->sc_sme)) {
|
|
aprint_error("%s: unable to register with sysmon\n",
|
|
device_xname(self));
|
|
sysmon_envsys_destroy(sc->sc_sme);
|
|
}
|
|
}
|
|
|
|
static void
|
|
tmp121temp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
|
|
{
|
|
struct tmp121temp_softc *sc = sme->sme_cookie;
|
|
uint16_t reg;
|
|
int16_t sreg;
|
|
int val;
|
|
|
|
if (spi_recv(sc->sc_sh, 2, (uint8_t *)®) != 0) {
|
|
edata->state = ENVSYS_SINVALID;
|
|
return;
|
|
}
|
|
|
|
sreg = (int16_t)be16toh(reg);
|
|
|
|
/*
|
|
* convert to uK:
|
|
*
|
|
* TMP121 bits:
|
|
* D15 : sign bit
|
|
* D14-D3 : data (D14 is MSB)
|
|
* D2-D0 : zero
|
|
*
|
|
* The data is represented in units of 0.0625 deg C.
|
|
*/
|
|
sreg >>= 3;
|
|
val = sreg * 62500 + 273150000;
|
|
|
|
edata->value_cur = val;
|
|
edata->state = ENVSYS_SVALID;
|
|
}
|