sys/powerpc/powermac/smusat.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2010 Nathan Whitehorn
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/module.h>
  33 #include <sys/bus.h>
  34 #include <sys/conf.h>
  35 #include <sys/cpu.h>
  36 #include <sys/ctype.h>
  37 #include <sys/kernel.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <dev/iicbus/iicbus.h>
  41 #include <dev/iicbus/iiconf.h>
  42 #include <dev/ofw/ofw_bus.h>
  43 #include <dev/ofw/openfirm.h>
  44
  45 #include <powerpc/powermac/powermac_thermal.h>
  46
  47 struct smu_sensor {
  48         struct pmac_therm therm;
  49         device_t dev;
  50
  51         cell_t  reg;
  52         enum {
  53                 SMU_CURRENT_SENSOR,
  54                 SMU_VOLTAGE_SENSOR,
  55                 SMU_POWER_SENSOR,
  56                 SMU_TEMP_SENSOR
  57         } type;
  58 };
  59
  60 static int      smusat_probe(device_t);
  61 static int      smusat_attach(device_t);
  62 static int      smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS);
  63 static int      smusat_sensor_read(struct smu_sensor *sens);
  64
  65 static MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors");
  66
  67 static device_method_t  smusat_methods[] = {
  68         /* Device interface */
  69         DEVMETHOD(device_probe,         smusat_probe),
  70         DEVMETHOD(device_attach,        smusat_attach),
  71         { 0, 0 },
  72 };
  73
  74 struct smusat_softc {
  75         struct smu_sensor *sc_sensors;
  76         int     sc_nsensors;
  77
  78         uint8_t sc_cache[16];
  79         time_t  sc_last_update;
  80 };
  81
  82 static driver_t smusat_driver = {
  83         "smusat",
  84         smusat_methods,
  85         sizeof(struct smusat_softc)
  86 };
  87
  88 DRIVER_MODULE(smusat, iicbus, smusat_driver, 0, 0);
  89
  90 static int
  91 smusat_probe(device_t dev)
  92 {
  93         const char *compat = ofw_bus_get_compat(dev);
  94
  95         if (compat == NULL || strcmp(compat, "smu-sat") != 0)
  96                 return (ENXIO);
  97
  98         device_set_desc(dev, "SMU Satellite Sensors");
  99         return (0);
 100 }
 101
 102 static int
 103 smusat_attach(device_t dev)
 104 {
 105         phandle_t child;
 106         struct smu_sensor *sens;
 107         struct smusat_softc *sc;
 108         struct sysctl_oid *sensroot_oid;
 109         struct sysctl_ctx_list *ctx;
 110         char type[32];
 111         int i;
 112
 113         sc = device_get_softc(dev);
 114         sc->sc_nsensors = 0;
 115         sc->sc_last_update = 0;
 116
 117         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
 118             child = OF_peer(child))
 119                 sc->sc_nsensors++;
 120
 121         if (sc->sc_nsensors == 0) {
 122                 device_printf(dev, "WARNING: No sensors detected!\n");
 123                 return (-1);
 124         }
 125
 126         sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor),
 127             M_SMUSAT, M_WAITOK | M_ZERO);
 128
 129         sens = sc->sc_sensors;
 130         sc->sc_nsensors = 0;
 131
 132         ctx = device_get_sysctl_ctx(dev);
 133         sensroot_oid = device_get_sysctl_tree(dev);
 134
 135         for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
 136             child = OF_peer(child)) {
 137                 char sysctl_name[40], sysctl_desc[40];
 138                 const char *units;
 139
 140                 sens->dev = dev;
 141                 sens->reg = 0;
 142                 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg));
 143                 if (sens->reg < 0x30)
 144                         continue;
 145                 sens->reg -= 0x30;
 146
 147                 OF_getprop(child, "zone", &sens->therm.zone, sizeof(int));
 148                 OF_getprop(child, "location", sens->therm.name,
 149                     sizeof(sens->therm.name));
 150
 151                 OF_getprop(child, "device_type", type, sizeof(type));
 152
 153                 if (strcmp(type, "current-sensor") == 0) {
 154                         sens->type = SMU_CURRENT_SENSOR;
 155                         units = "mA";
 156                 } else if (strcmp(type, "temp-sensor") == 0) {
 157                         sens->type = SMU_TEMP_SENSOR;
 158                         units = "C";
 159                 } else if (strcmp(type, "voltage-sensor") == 0) {
 160                         sens->type = SMU_VOLTAGE_SENSOR;
 161                         units = "mV";
 162                 } else if (strcmp(type, "power-sensor") == 0) {
 163                         sens->type = SMU_POWER_SENSOR;
 164                         units = "mW";
 165                 } else {
 166                         continue;
 167                 }
 168
 169                 for (i = 0; i < strlen(sens->therm.name); i++) {
 170                         sysctl_name[i] = tolower(sens->therm.name[i]);
 171                         if (isspace(sysctl_name[i]))
 172                                 sysctl_name[i] = '_';
 173                 }
 174                 sysctl_name[i] = 0;
 175
 176                 sprintf(sysctl_desc,"%s (%s)", sens->therm.name, units);
 177                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO,
 178                     sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
 179                     sc->sc_nsensors, smusat_sensor_sysctl,
 180                     (sens->type == SMU_TEMP_SENSOR) ? "IK" : "I", sysctl_desc);
 181
 182                 if (sens->type == SMU_TEMP_SENSOR) {
 183                         /* Make up some numbers */
 184                         sens->therm.target_temp = 500 + 2731; /* 50 C */
 185                         sens->therm.max_temp = 900 + 2731; /* 90 C */
 186                         sens->therm.read =
 187                             (int (*)(struct pmac_therm *))smusat_sensor_read;
 188                         pmac_thermal_sensor_register(&sens->therm);
 189                 }
 190
 191                 sens++;
 192                 sc->sc_nsensors++;
 193         }
 194
 195         return (0);
 196 }
 197
 198 static int
 199 smusat_updatecache(device_t dev)
 200 {
 201         uint8_t reg = 0x3f;
 202         uint8_t value[16];
 203         struct smusat_softc *sc = device_get_softc(dev);
 204         int error;
 205         struct iic_msg msgs[2] = {
 206             {0, IIC_M_WR | IIC_M_NOSTOP, 1, &reg},
 207             {0, IIC_M_RD, 16, value},
 208         };
 209
 210         msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev);
 211         error = iicbus_transfer(dev, msgs, 2);
 212         if (error)
 213                 return (error);
 214
 215         sc->sc_last_update = time_uptime;
 216         memcpy(sc->sc_cache, value, sizeof(value));
 217         return (0);
 218 }
 219
 220 static int
 221 smusat_sensor_read(struct smu_sensor *sens)
 222 {
 223         int value, error;
 224         device_t dev;
 225         struct smusat_softc *sc;
 226
 227         dev = sens->dev;
 228         sc = device_get_softc(dev);
 229         error = 0;
 230
 231         if (time_uptime - sc->sc_last_update > 1)
 232                 error = smusat_updatecache(dev);
 233         if (error)
 234                 return (-error);
 235
 236         value = (sc->sc_cache[sens->reg*2] << 8) +
 237             sc->sc_cache[sens->reg*2 + 1];
 238         if (value == 0xffff) {
 239                 sc->sc_last_update = 0; /* Result was bad, don't cache */
 240                 return (-EINVAL);
 241         }
 242
 243         switch (sens->type) {
 244         case SMU_TEMP_SENSOR:
 245                 /* 16.16 */
 246                 value <<= 10;
 247                 /* From 16.16 to 0.1 C */
 248                 value = 10*(value >> 16) + ((10*(value & 0xffff)) >> 16) + 2731;
 249                 break;
 250         case SMU_VOLTAGE_SENSOR:
 251                 /* 16.16 */
 252                 value <<= 4;
 253                 /* Kill the .16 */
 254                 value >>= 16;
 255                 break;
 256         case SMU_CURRENT_SENSOR:
 257                 /* 16.16 */
 258                 value <<= 8;
 259                 /* Kill the .16 */
 260                 value >>= 16;
 261                 break;
 262         case SMU_POWER_SENSOR:
 263                 /* Doesn't exist */
 264                 break;
 265         }
 266
 267         return (value);
 268 }
 269
 270 static int
 271 smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS)
 272 {
 273         device_t dev;
 274         struct smusat_softc *sc;
 275         struct smu_sensor *sens;
 276         int value, error;
 277
 278         dev = arg1;
 279         sc = device_get_softc(dev);
 280         sens = &sc->sc_sensors[arg2];
 281
 282         value = smusat_sensor_read(sens);
 283         if (value < 0)
 284                 return (EBUSY);
 285
 286         error = sysctl_handle_int(oidp, &value, 0, req);
 287
 288         return (error);
 289 }