1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/module.h> 36 #include <sys/bus.h> 37 #include <sys/conf.h> 38 #include <sys/cpu.h> 39 #include <sys/ctype.h> 40 #include <sys/kernel.h> 41 #include <sys/sysctl.h> 42 43 #include <dev/iicbus/iicbus.h> 44 #include <dev/iicbus/iiconf.h> 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/openfirm.h> 47 48 #include <powerpc/powermac/powermac_thermal.h> 49 50 struct smu_sensor { 51 struct pmac_therm therm; 52 device_t dev; 53 54 cell_t reg; 55 enum { 56 SMU_CURRENT_SENSOR, 57 SMU_VOLTAGE_SENSOR, 58 SMU_POWER_SENSOR, 59 SMU_TEMP_SENSOR 60 } type; 61 }; 62 63 static int smusat_probe(device_t); 64 static int smusat_attach(device_t); 65 static int smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS); 66 static int smusat_sensor_read(struct smu_sensor *sens); 67 68 static MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors"); 69 70 static device_method_t smusat_methods[] = { 71 /* Device interface */ 72 DEVMETHOD(device_probe, smusat_probe), 73 DEVMETHOD(device_attach, smusat_attach), 74 { 0, 0 }, 75 }; 76 77 struct smusat_softc { 78 struct smu_sensor *sc_sensors; 79 int sc_nsensors; 80 81 uint8_t sc_cache[16]; 82 time_t sc_last_update; 83 }; 84 85 static driver_t smusat_driver = { 86 "smusat", 87 smusat_methods, 88 sizeof(struct smusat_softc) 89 }; 90 91 static devclass_t smusat_devclass; 92 93 DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0); 94 95 static int 96 smusat_probe(device_t dev) 97 { 98 const char *compat = ofw_bus_get_compat(dev); 99 100 if (compat == NULL || strcmp(compat, "smu-sat") != 0) 101 return (ENXIO); 102 103 device_set_desc(dev, "SMU Satellite Sensors"); 104 return (0); 105 } 106 107 static int 108 smusat_attach(device_t dev) 109 { 110 phandle_t child; 111 struct smu_sensor *sens; 112 struct smusat_softc *sc; 113 struct sysctl_oid *sensroot_oid; 114 struct sysctl_ctx_list *ctx; 115 char type[32]; 116 int i; 117 118 sc = device_get_softc(dev); 119 sc->sc_nsensors = 0; 120 sc->sc_last_update = 0; 121 122 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 123 child = OF_peer(child)) 124 sc->sc_nsensors++; 125 126 if (sc->sc_nsensors == 0) { 127 device_printf(dev, "WARNING: No sensors detected!\n"); 128 return (-1); 129 } 130 131 sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor), 132 M_SMUSAT, M_WAITOK | M_ZERO); 133 134 sens = sc->sc_sensors; 135 sc->sc_nsensors = 0; 136 137 ctx = device_get_sysctl_ctx(dev); 138 sensroot_oid = device_get_sysctl_tree(dev); 139 140 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 141 child = OF_peer(child)) { 142 char sysctl_name[40], sysctl_desc[40]; 143 const char *units; 144 145 sens->dev = dev; 146 sens->reg = 0; 147 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg)); 148 if (sens->reg < 0x30) 149 continue; 150 sens->reg -= 0x30; 151 152 OF_getprop(child, "zone", &sens->therm.zone, sizeof(int)); 153 OF_getprop(child, "location", sens->therm.name, 154 sizeof(sens->therm.name)); 155 156 OF_getprop(child, "device_type", type, sizeof(type)); 157 158 if (strcmp(type, "current-sensor") == 0) { 159 sens->type = SMU_CURRENT_SENSOR; 160 units = "mA"; 161 } else if (strcmp(type, "temp-sensor") == 0) { 162 sens->type = SMU_TEMP_SENSOR; 163 units = "C"; 164 } else if (strcmp(type, "voltage-sensor") == 0) { 165 sens->type = SMU_VOLTAGE_SENSOR; 166 units = "mV"; 167 } else if (strcmp(type, "power-sensor") == 0) { 168 sens->type = SMU_POWER_SENSOR; 169 units = "mW"; 170 } else { 171 continue; 172 } 173 174 for (i = 0; i < strlen(sens->therm.name); i++) { 175 sysctl_name[i] = tolower(sens->therm.name[i]); 176 if (isspace(sysctl_name[i])) 177 sysctl_name[i] = '_'; 178 } 179 sysctl_name[i] = 0; 180 181 sprintf(sysctl_desc,"%s (%s)", sens->therm.name, units); 182 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, 183 sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 184 sc->sc_nsensors, smusat_sensor_sysctl, 185 (sens->type == SMU_TEMP_SENSOR) ? "IK" : "I", sysctl_desc); 186 187 if (sens->type == SMU_TEMP_SENSOR) { 188 /* Make up some numbers */ 189 sens->therm.target_temp = 500 + 2731; /* 50 C */ 190 sens->therm.max_temp = 900 + 2731; /* 90 C */ 191 sens->therm.read = 192 (int (*)(struct pmac_therm *))smusat_sensor_read; 193 pmac_thermal_sensor_register(&sens->therm); 194 } 195 196 sens++; 197 sc->sc_nsensors++; 198 } 199 200 return (0); 201 } 202 203 static int 204 smusat_updatecache(device_t dev) 205 { 206 uint8_t reg = 0x3f; 207 uint8_t value[16]; 208 struct smusat_softc *sc = device_get_softc(dev); 209 int error; 210 struct iic_msg msgs[2] = { 211 {0, IIC_M_WR | IIC_M_NOSTOP, 1, ®}, 212 {0, IIC_M_RD, 16, value}, 213 }; 214 215 msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev); 216 error = iicbus_transfer(dev, msgs, 2); 217 if (error) 218 return (error); 219 220 sc->sc_last_update = time_uptime; 221 memcpy(sc->sc_cache, value, sizeof(value)); 222 return (0); 223 } 224 225 static int 226 smusat_sensor_read(struct smu_sensor *sens) 227 { 228 int value, error; 229 device_t dev; 230 struct smusat_softc *sc; 231 232 dev = sens->dev; 233 sc = device_get_softc(dev); 234 error = 0; 235 236 if (time_uptime - sc->sc_last_update > 1) 237 error = smusat_updatecache(dev); 238 if (error) 239 return (-error); 240 241 value = (sc->sc_cache[sens->reg*2] << 8) + 242 sc->sc_cache[sens->reg*2 + 1]; 243 if (value == 0xffff) { 244 sc->sc_last_update = 0; /* Result was bad, don't cache */ 245 return (-EINVAL); 246 } 247 248 switch (sens->type) { 249 case SMU_TEMP_SENSOR: 250 /* 16.16 */ 251 value <<= 10; 252 /* From 16.16 to 0.1 C */ 253 value = 10*(value >> 16) + ((10*(value & 0xffff)) >> 16) + 2731; 254 break; 255 case SMU_VOLTAGE_SENSOR: 256 /* 16.16 */ 257 value <<= 4; 258 /* Kill the .16 */ 259 value >>= 16; 260 break; 261 case SMU_CURRENT_SENSOR: 262 /* 16.16 */ 263 value <<= 8; 264 /* Kill the .16 */ 265 value >>= 16; 266 break; 267 case SMU_POWER_SENSOR: 268 /* Doesn't exist */ 269 break; 270 } 271 272 return (value); 273 } 274 275 static int 276 smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS) 277 { 278 device_t dev; 279 struct smusat_softc *sc; 280 struct smu_sensor *sens; 281 int value, error; 282 283 dev = arg1; 284 sc = device_get_softc(dev); 285 sens = &sc->sc_sensors[arg2]; 286 287 value = smusat_sensor_read(sens); 288 if (value < 0) 289 return (EBUSY); 290 291 error = sysctl_handle_int(oidp, &value, 0, req); 292 293 return (error); 294 } 295