ds1775.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010 Andreas Tobler
    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 ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   23  * 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 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/bus.h>
   33 #include <sys/systm.h>
   34 #include <sys/module.h>
   35 #include <sys/callout.h>
   36 #include <sys/conf.h>
   37 #include <sys/cpu.h>
   38 #include <sys/ctype.h>
   39 #include <sys/kernel.h>
   40 #include <sys/reboot.h>
   41 #include <sys/rman.h>
   42 #include <sys/sysctl.h>
   43 #include <sys/limits.h>
   44 
   45 #include <machine/bus.h>
   46 #include <machine/md_var.h>
   47 
   48 #include <dev/iicbus/iicbus.h>
   49 #include <dev/iicbus/iiconf.h>
   50 
   51 #include <dev/ofw/openfirm.h>
   52 #include <dev/ofw/ofw_bus.h>
   53 #include <powerpc/powermac/powermac_thermal.h>
   54 
   55 /* Drivebay sensor: LM75/DS1775. */
   56 #define DS1775_TEMP         0x0
   57 
   58 /* Regular bus attachment functions */
   59 static int  ds1775_probe(device_t);
   60 static int  ds1775_attach(device_t);
   61 
   62 struct ds1775_softc {
   63         struct pmac_therm       sc_sensor;
   64         device_t                sc_dev;
   65         struct intr_config_hook enum_hook;
   66         uint32_t                sc_addr;
   67 };
   68 
   69 /* Utility functions */
   70 static int  ds1775_sensor_read(struct ds1775_softc *sc);
   71 static int  ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
   72 static void ds1775_start(void *xdev);
   73 static int  ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
   74                           uint16_t *data);
   75 
   76 static device_method_t  ds1775_methods[] = {
   77         /* Device interface */
   78         DEVMETHOD(device_probe,         ds1775_probe),
   79         DEVMETHOD(device_attach,        ds1775_attach),
   80         { 0, 0 },
   81 };
   82 
   83 static driver_t ds1775_driver = {
   84         "ds1775",
   85         ds1775_methods,
   86         sizeof(struct ds1775_softc)
   87 };
   88 
   89 DRIVER_MODULE(ds1775, iicbus, ds1775_driver, 0, 0);
   90 
   91 static int
   92 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
   93 {
   94         uint8_t buf[4];
   95         int err, try = 0;
   96 
   97         struct iic_msg msg[2] = {
   98             { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
   99             { addr, IIC_M_RD, 2, buf },
  100         };
  101 
  102         for (;;)
  103         {
  104                 err = iicbus_transfer(dev, msg, nitems(msg));
  105                 if (err != 0)
  106                         goto retry;
  107 
  108                 *data = *((uint16_t*)buf);
  109                 return (0);
  110         retry:
  111                 if (++try > 5) {
  112                         device_printf(dev, "iicbus read failed\n");
  113                         return (-1);
  114                 }
  115                 pause("ds1775_read_2", hz);
  116         }
  117 }
  118 
  119 static int
  120 ds1775_probe(device_t dev)
  121 {
  122         const char  *name, *compatible;
  123         struct ds1775_softc *sc;
  124 
  125         name = ofw_bus_get_name(dev);
  126         compatible = ofw_bus_get_compat(dev);
  127 
  128         if (!name)
  129                 return (ENXIO);
  130 
  131         if (strcmp(name, "temp-monitor") != 0 ||
  132             (strcmp(compatible, "ds1775") != 0 &&
  133              strcmp(compatible, "lm75") != 0))
  134                 return (ENXIO);
  135 
  136         sc = device_get_softc(dev);
  137         sc->sc_dev = dev;
  138         sc->sc_addr = iicbus_get_addr(dev);
  139 
  140         device_set_desc(dev, "Temp-Monitor DS1775");
  141 
  142         return (0);
  143 }
  144 
  145 static int
  146 ds1775_attach(device_t dev)
  147 {
  148         struct ds1775_softc *sc;
  149 
  150         sc = device_get_softc(dev);
  151 
  152         sc->enum_hook.ich_func = ds1775_start;
  153         sc->enum_hook.ich_arg = dev;
  154 
  155         /* We have to wait until interrupts are enabled. I2C read and write
  156          * only works if the interrupts are available.
  157          * The unin/i2c is controlled by the htpic on unin. But this is not
  158          * the master. The openpic on mac-io is controlling the htpic.
  159          * This one gets attached after the mac-io probing and then the
  160          * interrupts will be available.
  161          */
  162 
  163         if (config_intrhook_establish(&sc->enum_hook) != 0)
  164                 return (ENOMEM);
  165 
  166         return (0);
  167 }
  168 
  169 static void
  170 ds1775_start(void *xdev)
  171 {
  172         phandle_t child;
  173         struct ds1775_softc *sc;
  174         struct sysctl_oid *oid, *sensroot_oid;
  175         struct sysctl_ctx_list *ctx;
  176         ssize_t plen;
  177         int i;
  178         char sysctl_name[40], sysctl_desc[40];
  179 
  180         device_t dev = (device_t)xdev;
  181 
  182         sc = device_get_softc(dev);
  183 
  184         child = ofw_bus_get_node(dev);
  185 
  186         ctx = device_get_sysctl_ctx(dev);
  187         sensroot_oid = SYSCTL_ADD_NODE(ctx,
  188             SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
  189             CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "DS1775 Sensor Information");
  190 
  191         if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
  192                        sizeof(int)) < 0)
  193                 sc->sc_sensor.zone = 0;
  194 
  195         plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
  196                           sizeof(sc->sc_sensor.name));
  197 
  198         if (plen == -1) {
  199                 strcpy(sysctl_name, "sensor");
  200         } else {
  201                 for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
  202                         sysctl_name[i] = tolower(sc->sc_sensor.name[i]);
  203                         if (isspace(sysctl_name[i]))
  204                                 sysctl_name[i] = '_';
  205                 }
  206                 sysctl_name[i] = 0;
  207         }
  208 
  209         /* Make up target temperatures. These are low, for the drive bay. */
  210         if (sc->sc_sensor.zone == 0) {
  211                 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K;
  212                 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
  213         }
  214         else {
  215                 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
  216                 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
  217         }
  218 
  219         sc->sc_sensor.read =
  220             (int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
  221         pmac_thermal_sensor_register(&sc->sc_sensor);
  222 
  223         sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)");
  224         oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
  225             OID_AUTO, sysctl_name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
  226             "Sensor Information");
  227         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
  228                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
  229                         0, ds1775_sensor_sysctl, "IK", sysctl_desc);
  230 
  231         config_intrhook_disestablish(&sc->enum_hook);
  232 }
  233 
  234 static int
  235 ds1775_sensor_read(struct ds1775_softc *sc)
  236 {
  237         uint16_t buf[2];
  238         uint16_t read;
  239         int err;
  240 
  241         err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
  242         if (err < 0)
  243                 return (-1);
  244 
  245         read = *((int16_t *)buf);
  246 
  247         /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
  248            bit. The temperature is in tenth kelvin.
  249         */
  250         return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
  251 }
  252 
  253 static int
  254 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
  255 {
  256         device_t dev;
  257         struct ds1775_softc *sc;
  258         int error;
  259         int temp;
  260 
  261         dev = arg1;
  262         sc = device_get_softc(dev);
  263 
  264         temp = ds1775_sensor_read(sc);
  265         if (temp < 0)
  266                 return (EIO);
  267 
  268         error = sysctl_handle_int(oidp, &temp, 0, req);
  269 
  270         return (error);
  271 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/ds1775.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/ds1775.c