ds1775.c revision 222458
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: head/sys/dev/iicbus/ds1775.c 222458 2011-05-29 18:35:57Z nwhitehorn $"); 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#define FCU_ZERO_C_TO_K 2732 55 56/* Drivebay sensor: LM75/DS1775. */ 57#define DS1775_TEMP 0x0 58 59/* Regular bus attachment functions */ 60static int ds1775_probe(device_t); 61static int ds1775_attach(device_t); 62 63struct ds1775_softc { 64 struct pmac_therm sc_sensor; 65 device_t sc_dev; 66 struct intr_config_hook enum_hook; 67 uint32_t sc_addr; 68}; 69 70/* Utility functions */ 71static int ds1775_sensor_read(struct ds1775_softc *sc); 72static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS); 73static void ds1775_start(void *xdev); 74static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, 75 uint16_t *data); 76 77static device_method_t ds1775_methods[] = { 78 /* Device interface */ 79 DEVMETHOD(device_probe, ds1775_probe), 80 DEVMETHOD(device_attach, ds1775_attach), 81 { 0, 0 }, 82}; 83 84static driver_t ds1775_driver = { 85 "ds1775", 86 ds1775_methods, 87 sizeof(struct ds1775_softc) 88}; 89 90static devclass_t ds1775_devclass; 91 92DRIVER_MODULE(ds1755, iicbus, ds1775_driver, ds1775_devclass, 0, 0); 93 94static int 95ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data) 96{ 97 uint8_t buf[4]; 98 99 struct iic_msg msg[2] = { 100 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® }, 101 { addr, IIC_M_RD, 2, buf }, 102 }; 103 104 if (iicbus_transfer(dev, msg, 2) != 0) { 105 device_printf(dev, "iicbus read failed\n"); 106 return (EIO); 107 } 108 109 *data = *((uint16_t*)buf); 110 111 return (0); 112} 113 114static int 115ds1775_probe(device_t dev) 116{ 117 const char *name, *compatible; 118 struct ds1775_softc *sc; 119 120 name = ofw_bus_get_name(dev); 121 compatible = ofw_bus_get_compat(dev); 122 123 if (!name) 124 return (ENXIO); 125 126 if (strcmp(name, "temp-monitor") != 0 || 127 (strcmp(compatible, "ds1775") != 0 && 128 strcmp(compatible, "lm75") != 0)) 129 return (ENXIO); 130 131 sc = device_get_softc(dev); 132 sc->sc_dev = dev; 133 sc->sc_addr = iicbus_get_addr(dev); 134 135 device_set_desc(dev, "Temp-Monitor DS1775"); 136 137 return (0); 138} 139 140static int 141ds1775_attach(device_t dev) 142{ 143 struct ds1775_softc *sc; 144 145 sc = device_get_softc(dev); 146 147 sc->enum_hook.ich_func = ds1775_start; 148 sc->enum_hook.ich_arg = dev; 149 150 /* We have to wait until interrupts are enabled. I2C read and write 151 * only works if the interrupts are available. 152 * The unin/i2c is controlled by the htpic on unin. But this is not 153 * the master. The openpic on mac-io is controlling the htpic. 154 * This one gets attached after the mac-io probing and then the 155 * interrupts will be available. 156 */ 157 158 if (config_intrhook_establish(&sc->enum_hook) != 0) 159 return (ENOMEM); 160 161 return (0); 162} 163 164static void 165ds1775_start(void *xdev) 166{ 167 phandle_t child; 168 struct ds1775_softc *sc; 169 struct sysctl_oid *sensroot_oid; 170 struct sysctl_ctx_list *ctx; 171 ssize_t plen; 172 int i; 173 char sysctl_name[40], sysctl_desc[40]; 174 const char *units; 175 176 device_t dev = (device_t)xdev; 177 178 sc = device_get_softc(dev); 179 180 child = ofw_bus_get_node(dev); 181 182 ctx = device_get_sysctl_ctx(dev); 183 sensroot_oid = device_get_sysctl_tree(dev); 184 185 OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone, sizeof(int)); 186 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name, 187 sizeof(sc->sc_sensor.name)); 188 units = "C"; 189 190 if (plen == -1) { 191 strcpy(sysctl_name, "sensor"); 192 } else { 193 for (i = 0; i < strlen(sc->sc_sensor.name); i++) { 194 sysctl_name[i] = tolower(sc->sc_sensor.name[i]); 195 if (isspace(sysctl_name[i])) 196 sysctl_name[i] = '_'; 197 } 198 sysctl_name[i] = 0; 199 } 200 201 /* Make up target temperatures. These are low, for the drive bay. */ 202 sc->sc_sensor.target_temp = 300 + FCU_ZERO_C_TO_K; 203 sc->sc_sensor.max_temp = 600 + FCU_ZERO_C_TO_K; 204 205 sc->sc_sensor.read = 206 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read); 207 pmac_thermal_sensor_register(&sc->sc_sensor); 208 209 sprintf(sysctl_desc,"%s (%s)", sc->sc_sensor.name, units); 210 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(sensroot_oid), OID_AUTO, 211 sysctl_name, 212 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 213 0, ds1775_sensor_sysctl, "IK", sysctl_desc); 214 215 config_intrhook_disestablish(&sc->enum_hook); 216} 217 218static int 219ds1775_sensor_read(struct ds1775_softc *sc) 220{ 221 uint16_t buf[2]; 222 uint16_t read; 223 224 ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf); 225 226 read = *((int16_t *)buf); 227 228 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per 229 bit. The temperature is in tenth kelvin. 230 */ 231 return (((int16_t)(read) >> 7) * 5 + FCU_ZERO_C_TO_K); 232} 233 234static int 235ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS) 236{ 237 device_t dev; 238 struct ds1775_softc *sc; 239 int error; 240 unsigned int temp; 241 242 dev = arg1; 243 sc = device_get_softc(dev); 244 245 temp = ds1775_sensor_read(sc); 246 247 error = sysctl_handle_int(oidp, &temp, 0, req); 248 249 return (error); 250} 251