max44009.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause
    3  *
    4  * Copyright (c) Andriy Gapon
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions, and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_platform.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/bus.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/sysctl.h>
   39 #include <sys/systm.h>
   40 
   41 #include <machine/bus.h>
   42 
   43 #include <dev/iicbus/iicbus.h>
   44 #include <dev/iicbus/iiconf.h>
   45 
   46 #ifdef FDT
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/ofw_bus_subr.h>
   49 #endif
   50 
   51 /*
   52  * Driver for MAX44009 Ambient Light Sensor with ADC.
   53  */
   54 #define REG_LUX_HIGH                    0x03
   55 #define REG_LUX_LOW                     0x04
   56 
   57 struct max44009_softc {
   58         device_t                sc_dev;
   59         uint8_t                 sc_addr;
   60 };
   61 
   62 #ifdef FDT
   63 static const struct ofw_compat_data compat_data[] = {
   64         { "maxim,max44009",             true },
   65         { NULL,                         false },
   66 };
   67 #endif
   68 
   69 static int
   70 max44009_get_reading(device_t dev, u_int *reading)
   71 {
   72         struct iic_msg msgs[4];
   73         struct max44009_softc *sc;
   74         u_int val;
   75         uint8_t reghi, reglo, valhi, vallo;
   76         int error;
   77 
   78         sc = device_get_softc(dev);
   79 
   80         reghi = REG_LUX_HIGH;
   81         reglo = REG_LUX_LOW;
   82         msgs[0].slave = sc->sc_addr;
   83         msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
   84         msgs[0].len = 1;
   85         msgs[0].buf = &reghi;
   86         msgs[1].slave = sc->sc_addr;
   87         msgs[1].flags = IIC_M_RD | IIC_M_NOSTOP;
   88         msgs[1].len = 1;
   89         msgs[1].buf = &valhi;
   90         msgs[2].slave = sc->sc_addr;
   91         msgs[2].flags = IIC_M_WR | IIC_M_NOSTOP;
   92         msgs[2].len = 1;
   93         msgs[2].buf = &reglo;
   94         msgs[3].slave = sc->sc_addr;
   95         msgs[3].flags = IIC_M_RD;
   96         msgs[3].len = 1;
   97         msgs[3].buf = &vallo;
   98 
   99         error = iicbus_transfer_excl(dev, msgs, nitems(msgs), IIC_INTRWAIT);
  100         if (error != 0)
  101                 return (error);
  102 
  103         val = ((valhi & 0x0f) << 4) | (vallo & 0x0f);
  104         val <<= (valhi & 0xf0) >> 4;
  105         val = val * 72 / 100;
  106         *reading = val;
  107         return (0);
  108 }
  109 
  110 static int
  111 max44009_lux_sysctl(SYSCTL_HANDLER_ARGS)
  112 {
  113         device_t dev;
  114         u_int reading;
  115         int error, val;
  116 
  117         if (req->oldptr != NULL) {
  118                 dev = arg1;
  119                 error = max44009_get_reading(dev, &reading);
  120                 if (error != 0)
  121                         return (EIO);
  122                 val = reading;
  123         }
  124         error = sysctl_handle_int(oidp, &val, 0, req);
  125         return (error);
  126 }
  127 
  128 static int
  129 max44009_probe(device_t dev)
  130 {
  131         int rc;
  132 
  133 #ifdef FDT
  134         if (!ofw_bus_status_okay(dev))
  135                 return (ENXIO);
  136         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data)
  137                 rc = BUS_PROBE_GENERIC;
  138         else
  139 #endif
  140                 rc = BUS_PROBE_NOWILDCARD;
  141         device_set_desc(dev, "MAX44009 light intensity sensor");
  142         return (rc);
  143 }
  144 
  145 static int
  146 max44009_attach(device_t dev)
  147 {
  148         struct max44009_softc *sc;
  149         struct sysctl_ctx_list *ctx;
  150         struct sysctl_oid *tree_node;
  151         struct sysctl_oid_list *tree;
  152 
  153         sc = device_get_softc(dev);
  154         sc->sc_dev = dev;
  155         sc->sc_addr = iicbus_get_addr(dev);
  156 
  157         ctx = device_get_sysctl_ctx(dev);
  158         tree_node = device_get_sysctl_tree(dev);
  159         tree = SYSCTL_CHILDREN(tree_node);
  160 
  161         SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "illuminance",
  162             CTLTYPE_INT | CTLFLAG_RD, dev, 0,
  163             max44009_lux_sysctl, "I", "Light intensity, lux");
  164         return (0);
  165 }
  166 
  167 static int
  168 max44009_detach(device_t dev)
  169 {
  170         return (0);
  171 }
  172 
  173 static device_method_t  max44009_methods[] = {
  174         /* Device interface */
  175         DEVMETHOD(device_probe,         max44009_probe),
  176         DEVMETHOD(device_attach,        max44009_attach),
  177         DEVMETHOD(device_detach,        max44009_detach),
  178 
  179         DEVMETHOD_END
  180 };
  181 
  182 static driver_t max44009_driver = {
  183         "max44009",
  184         max44009_methods,
  185         sizeof(struct max44009_softc)
  186 };
  187 
  188 DRIVER_MODULE(max44009, iicbus, max44009_driver, 0, 0);
  189 MODULE_DEPEND(max44009, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
  190 MODULE_VERSION(max44009, 1);
  191 IICBUS_FDT_PNP_INFO(compat_data);

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/max44009.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/max44009.c