smusat.c revision 208842
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: head/sys/powerpc/powermac/smusat.c 208842 2010-06-05 17:51:37Z nwhitehorn $"); 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 46struct smu_sensor { 47 cell_t reg; 48 char location[32]; 49 enum { 50 SMU_CURRENT_SENSOR, 51 SMU_VOLTAGE_SENSOR, 52 SMU_POWER_SENSOR, 53 SMU_TEMP_SENSOR 54 } type; 55}; 56 57static int smusat_probe(device_t); 58static int smusat_attach(device_t); 59static int smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS); 60 61MALLOC_DEFINE(M_SMUSAT, "smusat", "SMU Sattelite Sensors"); 62 63static device_method_t smusat_methods[] = { 64 /* Device interface */ 65 DEVMETHOD(device_probe, smusat_probe), 66 DEVMETHOD(device_attach, smusat_attach), 67 { 0, 0 }, 68}; 69 70struct smusat_softc { 71 struct smu_sensor *sc_sensors; 72 int sc_nsensors; 73 74 uint8_t sc_cache[16]; 75 time_t sc_last_update; 76}; 77 78static driver_t smusat_driver = { 79 "smusat", 80 smusat_methods, 81 sizeof(struct smusat_softc) 82}; 83 84static devclass_t smusat_devclass; 85 86DRIVER_MODULE(smusat, iicbus, smusat_driver, smusat_devclass, 0, 0); 87 88static int 89smusat_probe(device_t dev) 90{ 91 const char *compat = ofw_bus_get_compat(dev); 92 93 if (compat == NULL || strcmp(compat, "smu-sat") != 0) 94 return (ENXIO); 95 96 device_set_desc(dev, "SMU Satellite Sensors"); 97 return (0); 98} 99 100static int 101smusat_attach(device_t dev) 102{ 103 phandle_t child; 104 struct smu_sensor *sens; 105 struct smusat_softc *sc; 106 struct sysctl_oid *sensroot_oid; 107 struct sysctl_ctx_list *ctx; 108 char type[32]; 109 int i; 110 111 sc = device_get_softc(dev); 112 sc->sc_nsensors = 0; 113 sc->sc_last_update = 0; 114 115 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 116 child = OF_peer(child)) 117 sc->sc_nsensors++; 118 119 if (sc->sc_nsensors == 0) { 120 device_printf(dev, "WARNING: No sensors detected!\n"); 121 return (-1); 122 } 123 124 sc->sc_sensors = malloc(sc->sc_nsensors * sizeof(struct smu_sensor), 125 M_SMUSAT, M_WAITOK | M_ZERO); 126 127 sens = sc->sc_sensors; 128 sc->sc_nsensors = 0; 129 130 ctx = device_get_sysctl_ctx(dev); 131 sensroot_oid = device_get_sysctl_tree(dev); 132 133 for (child = OF_child(ofw_bus_get_node(dev)); child != 0; 134 child = OF_peer(child)) { 135 char sysctl_name[40], sysctl_desc[40]; 136 const char *units; 137 138 sens->reg = 0; 139 OF_getprop(child, "reg", &sens->reg, sizeof(sens->reg)); 140 if (sens->reg < 0x30) 141 continue; 142 143 sens->reg -= 0x30; 144 OF_getprop(child, "location", sens->location, 145 sizeof(sens->location)); 146 147 OF_getprop(child, "device_type", type, sizeof(type)); 148 149 if (strcmp(type, "current-sensor") == 0) { 150 sens->type = SMU_CURRENT_SENSOR; 151 units = "mA"; 152 } else if (strcmp(type, "temp-sensor") == 0) { 153 sens->type = SMU_TEMP_SENSOR; 154 units = "C"; 155 } else if (strcmp(type, "voltage-sensor") == 0) { 156 sens->type = SMU_VOLTAGE_SENSOR; 157 units = "mV"; 158 } else if (strcmp(type, "power-sensor") == 0) { 159 sens->type = SMU_POWER_SENSOR; 160 units = "mW"; 161 } else { 162 continue; 163 } 164 165 for (i = 0; i < strlen(sens->location); i++) { 166 sysctl_name[i] = tolower(sens->location[i]); 167 if (isspace(sysctl_name[i])) 168 sysctl_name[i] = '_'; 169 } 170 sysctl_name[i] = 0; 171 172 sprintf(sysctl_desc,"%s (%s)", sens->location, units); 173 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, 174 sysctl_name, CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 175 sc->sc_nsensors, smusat_sensor_sysctl, "I", sysctl_desc); 176 177 sens++; 178 sc->sc_nsensors++; 179 } 180 181 return (0); 182} 183 184static int 185smusat_updatecache(device_t dev) 186{ 187 uint8_t reg = 0x3f; 188 struct smusat_softc *sc = device_get_softc(dev); 189 struct iic_msg msgs[2] = { 190 {0, IIC_M_WR | IIC_M_NOSTOP, 1, ®}, 191 {0, IIC_M_RD, 16, sc->sc_cache}, 192 }; 193 194 msgs[0].slave = msgs[1].slave = iicbus_get_addr(dev); 195 sc->sc_last_update = time_uptime; 196 197 return (iicbus_transfer(dev, msgs, 2)); 198} 199 200static int 201smusat_sensor_read(device_t dev, struct smu_sensor *sens, int *val) 202{ 203 int value; 204 struct smusat_softc *sc; 205 206 sc = device_get_softc(dev); 207 208 if (time_uptime - sc->sc_last_update > 1) 209 smusat_updatecache(dev); 210 211 value = (sc->sc_cache[sens->reg*2] << 8) + 212 sc->sc_cache[sens->reg*2 + 1]; 213 214 switch (sens->type) { 215 case SMU_TEMP_SENSOR: 216 /* 16.16 */ 217 value <<= 10; 218 /* Kill the .16 */ 219 value >>= 16; 220 break; 221 case SMU_VOLTAGE_SENSOR: 222 /* 16.16 */ 223 value <<= 4; 224 /* Kill the .16 */ 225 value >>= 16; 226 break; 227 case SMU_CURRENT_SENSOR: 228 /* 16.16 */ 229 value <<= 8; 230 /* Kill the .16 */ 231 value >>= 16; 232 break; 233 case SMU_POWER_SENSOR: 234 /* Doesn't exist */ 235 break; 236 } 237 238 *val = value; 239 return (0); 240} 241 242static int 243smusat_sensor_sysctl(SYSCTL_HANDLER_ARGS) 244{ 245 device_t dev; 246 struct smusat_softc *sc; 247 struct smu_sensor *sens; 248 int value, error; 249 250 dev = arg1; 251 sc = device_get_softc(dev); 252 sens = &sc->sc_sensors[arg2]; 253 254 error = smusat_sensor_read(dev, sens, &value); 255 if (error != 0) 256 return (error); 257 258 error = sysctl_handle_int(oidp, &value, 0, req); 259 260 return (error); 261} 262 263