ds1775.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * Copyright (c) 2010 Andreas Tobler
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   19  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   21  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   22  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/systm.h>
   33 #include <sys/module.h>
   34 #include <sys/callout.h>
   35 #include <sys/conf.h>
   36 #include <sys/cpu.h>
   37 #include <sys/ctype.h>
   38 #include <sys/kernel.h>
   39 #include <sys/reboot.h>
   40 #include <sys/rman.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/limits.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/md_var.h>
   46 
   47 #include <dev/iicbus/iicbus.h>
   48 #include <dev/iicbus/iiconf.h>
   49 
   50 #include <dev/ofw/openfirm.h>
   51 #include <dev/ofw/ofw_bus.h>
   52 #include <powerpc/powermac/powermac_thermal.h>
   53 
   54 /* Drivebay sensor: LM75/DS1775. */
   55 #define DS1775_TEMP         0x0
   56 
   57 /* Regular bus attachment functions */
   58 static int  ds1775_probe(device_t);
   59 static int  ds1775_attach(device_t);
   60 
   61 struct ds1775_softc {
   62         struct pmac_therm       sc_sensor;
   63         device_t                sc_dev;
   64         struct intr_config_hook enum_hook;
   65         uint32_t                sc_addr;
   66 };
   67 
   68 /* Utility functions */
   69 static int  ds1775_sensor_read(struct ds1775_softc *sc);
   70 static int  ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
   71 static void ds1775_start(void *xdev);
   72 static int  ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
   73                           uint16_t *data);
   74 
   75 static device_method_t  ds1775_methods[] = {
   76         /* Device interface */
   77         DEVMETHOD(device_probe,         ds1775_probe),
   78         DEVMETHOD(device_attach,        ds1775_attach),
   79         { 0, 0 },
   80 };
   81 
   82 static driver_t ds1775_driver = {
   83         "ds1775",
   84         ds1775_methods,
   85         sizeof(struct ds1775_softc)
   86 };
   87 
   88 static devclass_t ds1775_devclass;
   89 
   90 DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
   91 
   92 static int
   93 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
   94 {
   95         uint8_t buf[4];
   96         int err, try = 0;
   97 
   98         struct iic_msg msg[2] = {
   99             { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
  100             { addr, IIC_M_RD, 2, buf },
  101         };
  102 
  103         for (;;)
  104         {
  105                 err = iicbus_transfer(dev, msg, 2);
  106                 if (err != 0)
  107                         goto retry;
  108 
  109                 *data = *((uint16_t*)buf);
  110                 return (0);
  111         retry:
  112                 if (++try > 5) {
  113                         device_printf(dev, "iicbus read failed\n");
  114                         return (-1);
  115                 }
  116                 pause("ds1775_read_2", hz);
  117         }
  118 }
  119 
  120 static int
  121 ds1775_probe(device_t dev)
  122 {
  123         const char  *name, *compatible;
  124         struct ds1775_softc *sc;
  125 
  126         name = ofw_bus_get_name(dev);
  127         compatible = ofw_bus_get_compat(dev);
  128 
  129         if (!name)
  130                 return (ENXIO);
  131 
  132         if (strcmp(name, "temp-monitor") != 0 ||
  133             (strcmp(compatible, "ds1775") != 0 &&
  134              strcmp(compatible, "lm75") != 0))
  135                 return (ENXIO);
  136 
  137         sc = device_get_softc(dev);
  138         sc->sc_dev = dev;
  139         sc->sc_addr = iicbus_get_addr(dev);
  140 
  141         device_set_desc(dev, "Temp-Monitor DS1775");
  142 
  143         return (0);
  144 }
  145 
  146 static int
  147 ds1775_attach(device_t dev)
  148 {
  149         struct ds1775_softc *sc;
  150 
  151         sc = device_get_softc(dev);
  152 
  153         sc->enum_hook.ich_func = ds1775_start;
  154         sc->enum_hook.ich_arg = dev;
  155 
  156         /* We have to wait until interrupts are enabled. I2C read and write
  157          * only works if the interrupts are available.
  158          * The unin/i2c is controlled by the htpic on unin. But this is not
  159          * the master. The openpic on mac-io is controlling the htpic.
  160          * This one gets attached after the mac-io probing and then the
  161          * interrupts will be available.
  162          */
  163 
  164         if (config_intrhook_establish(&sc->enum_hook) != 0)
  165                 return (ENOMEM);
  166 
  167         return (0);
  168 }
  169 
  170 static void
  171 ds1775_start(void *xdev)
  172 {
  173         phandle_t child;
  174         struct ds1775_softc *sc;
  175         struct sysctl_oid *sensroot_oid;
  176         struct sysctl_ctx_list *ctx;
  177         ssize_t plen;
  178         int i;
  179         char sysctl_name[40], sysctl_desc[40];
  180         const char *units;
  181 
  182         device_t dev = (device_t)xdev;
  183 
  184         sc = device_get_softc(dev);
  185 
  186         child = ofw_bus_get_node(dev);
  187 
  188         ctx = device_get_sysctl_ctx(dev);
  189         sensroot_oid = device_get_sysctl_tree(dev);
  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         units = "C";
  198 
  199         if (plen == -1) {
  200                 strcpy(sysctl_name, "sensor");
  201         } else {
  202                 for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
  203                         sysctl_name[i] = tolower(sc->sc_sensor.name[i]);
  204                         if (isspace(sysctl_name[i]))
  205                                 sysctl_name[i] = '_';
  206                 }
  207                 sysctl_name[i] = 0;
  208         }
  209 
  210         /* Make up target temperatures. These are low, for the drive bay. */
  211         if (sc->sc_sensor.zone == 0) {
  212                 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K;
  213                 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
  214         }
  215         else {
  216                 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
  217                 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
  218         }
  219 
  220         sc->sc_sensor.read =
  221             (int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
  222         pmac_thermal_sensor_register(&sc->sc_sensor);
  223 
  224         sprintf(sysctl_desc,"%s (%s)", sc->sc_sensor.name, units);
  225         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
  226                         sysctl_name,
  227                         CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
  228                         0, ds1775_sensor_sysctl, "IK", sysctl_desc);
  229 
  230         config_intrhook_disestablish(&sc->enum_hook);
  231 }
  232 
  233 static int
  234 ds1775_sensor_read(struct ds1775_softc *sc)
  235 {
  236         uint16_t buf[2];
  237         uint16_t read;
  238         int err;
  239 
  240         err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
  241         if (err < 0)
  242                 return (-1);
  243 
  244         read = *((int16_t *)buf);
  245 
  246         /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
  247            bit. The temperature is in tenth kelvin.
  248         */
  249         return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
  250 }
  251 
  252 static int
  253 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
  254 {
  255         device_t dev;
  256         struct ds1775_softc *sc;
  257         int error;
  258         unsigned int temp;
  259 
  260         dev = arg1;
  261         sc = device_get_softc(dev);
  262 
  263         temp = ds1775_sensor_read(sc);
  264         if (temp < 0)
  265                 return (EIO);
  266 
  267         error = sysctl_handle_int(oidp, &temp, 0, req);
  268 
  269         return (error);
  270 }

Cache object: be3099f98bdc5c8df9acd12a40253882

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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