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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) Andriy Gapon
*
* 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 AUTHOR 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 AUTHOR 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>
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
#ifdef FDT
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#endif
/*
* Driver for MAX44009 Ambient Light Sensor with ADC.
*/
#define REG_LUX_HIGH 0x03
#define REG_LUX_LOW 0x04
struct max44009_softc {
device_t sc_dev;
uint8_t sc_addr;
};
#ifdef FDT
static const struct ofw_compat_data compat_data[] = {
{ "maxim,max44009", true },
{ NULL, false },
};
#endif
static int
max44009_get_reading(device_t dev, u_int *reading)
{
struct iic_msg msgs[4];
struct max44009_softc *sc;
u_int val;
uint8_t reghi, reglo, valhi, vallo;
int error;
sc = device_get_softc(dev);
reghi = REG_LUX_HIGH;
reglo = REG_LUX_LOW;
msgs[0].slave = sc->sc_addr;
msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
msgs[0].len = 1;
msgs[0].buf = ®hi;
msgs[1].slave = sc->sc_addr;
msgs[1].flags = IIC_M_RD | IIC_M_NOSTOP;
msgs[1].len = 1;
msgs[1].buf = &valhi;
msgs[2].slave = sc->sc_addr;
msgs[2].flags = IIC_M_WR | IIC_M_NOSTOP;
msgs[2].len = 1;
msgs[2].buf = ®lo;
msgs[3].slave = sc->sc_addr;
msgs[3].flags = IIC_M_RD;
msgs[3].len = 1;
msgs[3].buf = &vallo;
error = iicbus_transfer_excl(dev, msgs, nitems(msgs), IIC_INTRWAIT);
if (error != 0)
return (error);
val = ((valhi & 0x0f) << 4) | (vallo & 0x0f);
val <<= (valhi & 0xf0) >> 4;
val = val * 72 / 100;
*reading = val;
return (0);
}
static int
max44009_lux_sysctl(SYSCTL_HANDLER_ARGS)
{
device_t dev;
u_int reading;
int error, val;
if (req->oldptr != NULL) {
dev = arg1;
error = max44009_get_reading(dev, &reading);
if (error != 0)
return (EIO);
val = reading;
}
error = sysctl_handle_int(oidp, &val, 0, req);
return (error);
}
static int
max44009_probe(device_t dev)
{
int rc;
#ifdef FDT
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data)
rc = BUS_PROBE_GENERIC;
else
#endif
rc = BUS_PROBE_NOWILDCARD;
device_set_desc(dev, "MAX44009 light intensity sensor");
return (rc);
}
static int
max44009_attach(device_t dev)
{
struct max44009_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree_node;
struct sysctl_oid_list *tree;
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_addr = iicbus_get_addr(dev);
ctx = device_get_sysctl_ctx(dev);
tree_node = device_get_sysctl_tree(dev);
tree = SYSCTL_CHILDREN(tree_node);
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "illuminance",
CTLTYPE_INT | CTLFLAG_RD, dev, 0,
max44009_lux_sysctl, "I", "Light intensity, lux");
return (0);
}
static int
max44009_detach(device_t dev)
{
return (0);
}
static device_method_t max44009_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, max44009_probe),
DEVMETHOD(device_attach, max44009_attach),
DEVMETHOD(device_detach, max44009_detach),
DEVMETHOD_END
};
static driver_t max44009_driver = {
"max44009",
max44009_methods,
sizeof(struct max44009_softc)
};
DRIVER_MODULE(max44009, iicbus, max44009_driver, 0, 0);
MODULE_DEPEND(max44009, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
MODULE_VERSION(max44009, 1);
IICBUS_FDT_PNP_INFO(compat_data);
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