1/*- 2 * Copyright (c) 2010 Nathan Whitehorn 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 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD$"); 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/module.h> 34#include <sys/bus.h> 35#include <sys/conf.h> 36#include <sys/cpu.h> 37#include <sys/ctype.h> 38#include <sys/kernel.h> 39#include <sys/sysctl.h> 40 41#include <dev/iicbus/iicbus.h> 42#include <dev/iicbus/iiconf.h> 43#include <dev/ofw/ofw_bus.h> 44#include <dev/ofw/openfirm.h> 45 46#include <powerpc/powermac/powermac_thermal.h> 47 48struct smu_sensor { 49 struct pmac_therm therm; 50 device_t dev; 51 52 cell_t reg; 53 enum { 54 SMU_CURRENT_SENSOR, 55 SMU_VOLTAGE_SENSOR, 56 SMU_POWER_SENSOR, 57 SMU_TEMP_SENSOR 58 } type; 59}; 60 61static int smusat_probe(device_t); 62static int smusat_attach(device_t); 63static int smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS); 64static int smusat_sensor_read(struct smu_sensor *sens); 65 66static MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors"); 67 68static device_method_t smusat_methods[] = { 69 /* Device interface */ 70 DEVMETHOD(device_probe, smusat_probe), 71 DEVMETHOD(device_attach, smusat_attach), 72 { 0, 0 }, 73}; 74 75struct smusat_softc { 76 struct smu_sensor *sc_sensors; 77 int sc_nsensors; 78 79 uint8_t sc_cache[16]; 80 time_t sc_last_update; 81}; 82 83static driver_t smusat_driver = { 84 "smusat", 85 smusat_methods, 86 sizeof(struct smusat_softc) 87}; 88 89static devclass_t smusat_devclass; 90 91DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0); 92 93static int 94smusat_probe(device_t dev) 95{ 96 const char *compat = ofw_bus_get_compat(dev); 97 98 if (compat == NULL || strcmp(compat, "smu-sat") != 0) 99 return (ENXIO); 100 101 device_set_desc(dev, "SMU Satellite Sensors"); 102 return (0); 103} 104 105static int 106smusat_attach(device_t dev) 107{ 108 phandle_t child; 109 struct smu_sensor *sens; 110 struct smusat_softc *sc; 111 struct sysctl_oid *sensroot_oid; 112 struct sysctl_ctx_list *ctx; 113 char type[32]; 114 int i; 115 116 sc = device_get_softc(dev); 117 sc->sc_nsensors = 0; 118 sc->sc_last_update = 0; 119 120 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 121 child = OF_peer(child)) 122 sc->sc_nsensors++; 123 124 if (sc->sc_nsensors == 0) { 125 device_printf(dev, "WARNING: No sensors detected!\n"); 126 return (-1); 127 } 128 129 sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor), 130 M_SMUSAT, M_WAITOK | M_ZERO); 131 132 sens = sc->sc_sensors; 133 sc->sc_nsensors = 0; 134 135 ctx = device_get_sysctl_ctx(dev); 136 sensroot_oid = device_get_sysctl_tree(dev); 137 138 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 139 child = OF_peer(child)) { 140 char sysctl_name[40], sysctl_desc[40]; 141 const char *units; 142 143 sens->dev = dev; 144 sens->reg = 0; 145 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg)); 146 if (sens->reg < 0x30) 147 continue; 148 sens->reg -= 0x30; 149 150 OF_getprop(child, "zone", &sens->therm.zone, sizeof(int)); 151 OF_getprop(child, "location", sens->therm.name, 152 sizeof(sens->therm.name)); 153 154 OF_getprop(child, "device_type", type, sizeof(type)); 155 156 if (strcmp(type, "current-sensor") == 0) { 157 sens->type = SMU_CURRENT_SENSOR; 158 units = "mA"; 159 } else if (strcmp(type, "temp-sensor") == 0) { 160 sens->type = SMU_TEMP_SENSOR; 161 units = "C"; 162 } else if (strcmp(type, "voltage-sensor") == 0) { 163 sens->type = SMU_VOLTAGE_SENSOR; 164 units = "mV"; 165 } else if (strcmp(type, "power-sensor") == 0) { 166 sens->type = SMU_POWER_SENSOR; 167 units = "mW"; 168 } else { 169 continue; 170 } 171 172 for (i = 0; i < strlen(sens->therm.name); i++) { 173 sysctl_name[i] = tolower(sens->therm.name[i]); 174 if (isspace(sysctl_name[i])) 175 sysctl_name[i] = '_'; 176 } 177 sysctl_name[i] = 0; 178 179 sprintf(sysctl_desc,"%s (%s)", sens->therm.name, units); 180 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, 181 sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 182 sc->sc_nsensors, smusat_sensor_sysctl, 183 (sens->type == SMU_TEMP_SENSOR) ? "IK" : "I", sysctl_desc); 184 185 if (sens->type == SMU_TEMP_SENSOR) { 186 /* Make up some numbers */ 187 sens->therm.target_temp = 500 + 2731; /* 50 C */ 188 sens->therm.max_temp = 900 + 2731; /* 90 C */ 189 sens->therm.read = 190 (int (*)(struct pmac_therm *))smusat_sensor_read; 191 pmac_thermal_sensor_register(&sens->therm); 192 } 193 194 sens++; 195 sc->sc_nsensors++; 196 } 197 198 return (0); 199} 200 201static int 202smusat_updatecache(device_t dev) 203{ 204 uint8_t reg = 0x3f; 205 uint8_t value[16]; 206 struct smusat_softc *sc = device_get_softc(dev); 207 int error; 208 struct iic_msg msgs[2] = { 209 {0, IIC_M_WR | IIC_M_NOSTOP, 1, ®}, 210 {0, IIC_M_RD, 16, value}, 211 }; 212 213 msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev); 214 error = iicbus_transfer(dev, msgs, 2); 215 if (error) 216 return (error); 217 218 sc->sc_last_update = time_uptime; 219 memcpy(sc->sc_cache, value, sizeof(value)); 220 return (0); 221} 222 223static int 224smusat_sensor_read(struct smu_sensor *sens) 225{ 226 int value, error; 227 device_t dev; 228 struct smusat_softc *sc; 229 230 dev = sens->dev; 231 sc = device_get_softc(dev); 232 error = 0; 233 234 if (time_uptime - sc->sc_last_update > 1) 235 error = smusat_updatecache(dev); 236 if (error) 237 return (-error); 238 239 value = (sc->sc_cache[sens->reg*2] << 8) + 240 sc->sc_cache[sens->reg*2 + 1]; 241 if (value == 0xffff) { 242 sc->sc_last_update = 0; /* Result was bad, don't cache */ 243 return (-EINVAL); 244 } 245 246 switch (sens->type) { 247 case SMU_TEMP_SENSOR: 248 /* 16.16 */ 249 value <<= 10; 250 /* From 16.16 to 0.1 C */ 251 value = 10*(value >> 16) + ((10*(value & 0xffff)) >> 16) + 2731; 252 break; 253 case SMU_VOLTAGE_SENSOR: 254 /* 16.16 */ 255 value <<= 4; 256 /* Kill the .16 */ 257 value >>= 16; 258 break; 259 case SMU_CURRENT_SENSOR: 260 /* 16.16 */ 261 value <<= 8; 262 /* Kill the .16 */ 263 value >>= 16; 264 break; 265 case SMU_POWER_SENSOR: 266 /* Doesn't exist */ 267 break; 268 } 269 270 return (value); 271} 272 273static int 274smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS) 275{ 276 device_t dev; 277 struct smusat_softc *sc; 278 struct smu_sensor *sens; 279 int value, error; 280 281 dev = arg1; 282 sc = device_get_softc(dev); 283 sens = &sc->sc_sensors[arg2]; 284 285 value = smusat_sensor_read(sens); 286 if (value < 0) 287 return (EBUSY); 288 289 error = sysctl_handle_int(oidp, &value, 0, req); 290 291 return (error); 292} 293 294