1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2010 Andreas Tobler 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD$"); 30 31#include <sys/param.h> 32#include <sys/bus.h> 33#include <sys/systm.h> 34#include <sys/module.h> 35#include <sys/callout.h> 36#include <sys/conf.h> 37#include <sys/cpu.h> 38#include <sys/ctype.h> 39#include <sys/kernel.h> 40#include <sys/reboot.h> 41#include <sys/rman.h> 42#include <sys/sysctl.h> 43#include <sys/limits.h> 44 45#include <machine/bus.h> 46#include <machine/md_var.h> 47 48#include <dev/iicbus/iicbus.h> 49#include <dev/iicbus/iiconf.h> 50 51#include <dev/ofw/openfirm.h> 52#include <dev/ofw/ofw_bus.h> 53#include <powerpc/powermac/powermac_thermal.h> 54 55/* Drivebay sensor: LM75/DS1775. */ 56#define DS1775_TEMP 0x0 57 58/* Regular bus attachment functions */ 59static int ds1775_probe(device_t); 60static int ds1775_attach(device_t); 61 62struct ds1775_softc { 63 struct pmac_therm sc_sensor; 64 device_t sc_dev; 65 struct intr_config_hook enum_hook; 66 uint32_t sc_addr; 67}; 68 69/* Utility functions */ 70static int ds1775_sensor_read(struct ds1775_softc *sc); 71static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS); 72static void ds1775_start(void *xdev); 73static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, 74 uint16_t *data); 75 76static device_method_t ds1775_methods[] = { 77 /* Device interface */ 78 DEVMETHOD(device_probe, ds1775_probe), 79 DEVMETHOD(device_attach, ds1775_attach), 80 { 0, 0 }, 81}; 82 83static driver_t ds1775_driver = { 84 "ds1775", 85 ds1775_methods, 86 sizeof(struct ds1775_softc) 87}; 88 89static devclass_t ds1775_devclass; 90 91DRIVER_MODULE(ds1775, iicbus, ds1775_driver, ds1775_devclass, 0, 0); 92 93static int 94ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data) 95{ 96 uint8_t buf[4]; 97 int err, try = 0; 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 for (;;) 105 { 106 err = iicbus_transfer(dev, msg, nitems(msg)); 107 if (err != 0) 108 goto retry; 109 110 *data = *((uint16_t*)buf); 111 return (0); 112 retry: 113 if (++try > 5) { 114 device_printf(dev, "iicbus read failed\n"); 115 return (-1); 116 } 117 pause("ds1775_read_2", hz); 118 } 119} 120 121static int 122ds1775_probe(device_t dev) 123{ 124 const char *name, *compatible; 125 struct ds1775_softc *sc; 126 127 name = ofw_bus_get_name(dev); 128 compatible = ofw_bus_get_compat(dev); 129 130 if (!name) 131 return (ENXIO); 132 133 if (strcmp(name, "temp-monitor") != 0 || 134 (strcmp(compatible, "ds1775") != 0 && 135 strcmp(compatible, "lm75") != 0)) 136 return (ENXIO); 137 138 sc = device_get_softc(dev); 139 sc->sc_dev = dev; 140 sc->sc_addr = iicbus_get_addr(dev); 141 142 device_set_desc(dev, "Temp-Monitor DS1775"); 143 144 return (0); 145} 146 147static int 148ds1775_attach(device_t dev) 149{ 150 struct ds1775_softc *sc; 151 152 sc = device_get_softc(dev); 153 154 sc->enum_hook.ich_func = ds1775_start; 155 sc->enum_hook.ich_arg = dev; 156 157 /* We have to wait until interrupts are enabled. I2C read and write 158 * only works if the interrupts are available. 159 * The unin/i2c is controlled by the htpic on unin. But this is not 160 * the master. The openpic on mac-io is controlling the htpic. 161 * This one gets attached after the mac-io probing and then the 162 * interrupts will be available. 163 */ 164 165 if (config_intrhook_establish(&sc->enum_hook) != 0) 166 return (ENOMEM); 167 168 return (0); 169} 170 171static void 172ds1775_start(void *xdev) 173{ 174 phandle_t child; 175 struct ds1775_softc *sc; 176 struct sysctl_oid *oid, *sensroot_oid; 177 struct sysctl_ctx_list *ctx; 178 ssize_t plen; 179 int i; 180 char sysctl_name[40], sysctl_desc[40]; 181 182 device_t dev = (device_t)xdev; 183 184 sc = device_get_softc(dev); 185 186 child = ofw_bus_get_node(dev); 187 188 ctx = device_get_sysctl_ctx(dev); 189 sensroot_oid = SYSCTL_ADD_NODE(ctx, 190 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor", 191 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "DS1775 Sensor Information"); 192 193 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone, 194 sizeof(int)) < 0) 195 sc->sc_sensor.zone = 0; 196 197 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name, 198 sizeof(sc->sc_sensor.name)); 199 200 if (plen == -1) { 201 strcpy(sysctl_name, "sensor"); 202 } else { 203 for (i = 0; i < strlen(sc->sc_sensor.name); i++) { 204 sysctl_name[i] = tolower(sc->sc_sensor.name[i]); 205 if (isspace(sysctl_name[i])) 206 sysctl_name[i] = '_'; 207 } 208 sysctl_name[i] = 0; 209 } 210 211 /* Make up target temperatures. These are low, for the drive bay. */ 212 if (sc->sc_sensor.zone == 0) { 213 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K; 214 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K; 215 } 216 else { 217 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K; 218 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K; 219 } 220 221 sc->sc_sensor.read = 222 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read); 223 pmac_thermal_sensor_register(&sc->sc_sensor); 224 225 sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)"); 226 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid), 227 OID_AUTO, sysctl_name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 228 "Sensor Information"); 229 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp", 230 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 231 0, ds1775_sensor_sysctl, "IK", sysctl_desc); 232 233 config_intrhook_disestablish(&sc->enum_hook); 234} 235 236static int 237ds1775_sensor_read(struct ds1775_softc *sc) 238{ 239 uint16_t buf[2]; 240 uint16_t read; 241 int err; 242 243 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf); 244 if (err < 0) 245 return (-1); 246 247 read = *((int16_t *)buf); 248 249 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per 250 bit. The temperature is in tenth kelvin. 251 */ 252 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K); 253} 254 255static int 256ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS) 257{ 258 device_t dev; 259 struct ds1775_softc *sc; 260 int error; 261 int temp; 262 263 dev = arg1; 264 sc = device_get_softc(dev); 265 266 temp = ds1775_sensor_read(sc); 267 if (temp < 0) 268 return (EIO); 269 270 error = sysctl_handle_int(oidp, &temp, 0, req); 271 272 return (error); 273} 274