192 lines
4.6 KiB
C
192 lines
4.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) Andriy Gapon
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#ifdef FDT
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#endif
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/*
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* Driver for MAX44009 Ambient Light Sensor with ADC.
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*/
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#define REG_LUX_HIGH 0x03
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#define REG_LUX_LOW 0x04
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struct max44009_softc {
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device_t sc_dev;
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uint8_t sc_addr;
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};
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#ifdef FDT
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static const struct ofw_compat_data compat_data[] = {
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{ "maxim,max44009", true },
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{ NULL, false },
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};
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#endif
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static int
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max44009_get_reading(device_t dev, u_int *reading)
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{
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struct iic_msg msgs[4];
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struct max44009_softc *sc;
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u_int val;
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uint8_t reghi, reglo, valhi, vallo;
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int error;
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sc = device_get_softc(dev);
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reghi = REG_LUX_HIGH;
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reglo = REG_LUX_LOW;
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msgs[0].slave = sc->sc_addr;
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msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
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msgs[0].len = 1;
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msgs[0].buf = ®hi;
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msgs[1].slave = sc->sc_addr;
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msgs[1].flags = IIC_M_RD | IIC_M_NOSTOP;
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msgs[1].len = 1;
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msgs[1].buf = &valhi;
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msgs[2].slave = sc->sc_addr;
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msgs[2].flags = IIC_M_WR | IIC_M_NOSTOP;
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msgs[2].len = 1;
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msgs[2].buf = ®lo;
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msgs[3].slave = sc->sc_addr;
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msgs[3].flags = IIC_M_RD;
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msgs[3].len = 1;
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msgs[3].buf = &vallo;
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error = iicbus_transfer_excl(dev, msgs, nitems(msgs), IIC_INTRWAIT);
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if (error != 0)
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return (error);
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val = ((valhi & 0x0f) << 4) | (vallo & 0x0f);
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val <<= (valhi & 0xf0) >> 4;
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val = val * 72 / 100;
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*reading = val;
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return (0);
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}
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static int
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max44009_lux_sysctl(SYSCTL_HANDLER_ARGS)
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{
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device_t dev;
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u_int reading;
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int error, val;
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if (req->oldptr != NULL) {
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dev = arg1;
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error = max44009_get_reading(dev, &reading);
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if (error != 0)
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return (EIO);
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val = reading;
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}
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error = sysctl_handle_int(oidp, &val, 0, req);
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return (error);
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}
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static int
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max44009_probe(device_t dev)
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{
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int rc;
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#ifdef FDT
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data)
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rc = BUS_PROBE_GENERIC;
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else
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#endif
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rc = BUS_PROBE_NOWILDCARD;
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device_set_desc(dev, "MAX44009 light intensity sensor");
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return (rc);
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}
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static int
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max44009_attach(device_t dev)
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{
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struct max44009_softc *sc;
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struct sysctl_ctx_list *ctx;
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struct sysctl_oid *tree_node;
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struct sysctl_oid_list *tree;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_addr = iicbus_get_addr(dev);
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ctx = device_get_sysctl_ctx(dev);
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tree_node = device_get_sysctl_tree(dev);
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tree = SYSCTL_CHILDREN(tree_node);
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SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "illuminance",
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CTLTYPE_INT | CTLFLAG_RD, dev, 0,
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max44009_lux_sysctl, "I", "Light intensity, lux");
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return (0);
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}
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static int
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max44009_detach(device_t dev)
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{
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return (0);
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}
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static device_method_t max44009_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, max44009_probe),
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DEVMETHOD(device_attach, max44009_attach),
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DEVMETHOD(device_detach, max44009_detach),
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DEVMETHOD_END
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};
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static driver_t max44009_driver = {
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"max44009",
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max44009_methods,
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sizeof(struct max44009_softc)
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};
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DRIVER_MODULE(max44009, iicbus, max44009_driver, 0, 0);
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MODULE_DEPEND(max44009, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
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MODULE_VERSION(max44009, 1);
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IICBUS_FDT_PNP_INFO(compat_data);
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