2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010 Andreas Tobler
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/module.h>
36 #include <sys/callout.h>
39 #include <sys/ctype.h>
40 #include <sys/kernel.h>
41 #include <sys/reboot.h>
43 #include <sys/sysctl.h>
44 #include <sys/limits.h>
46 #include <machine/bus.h>
47 #include <machine/md_var.h>
49 #include <dev/iicbus/iicbus.h>
50 #include <dev/iicbus/iiconf.h>
52 #include <dev/ofw/openfirm.h>
53 #include <dev/ofw/ofw_bus.h>
54 #include <powerpc/powermac/powermac_thermal.h>
56 /* Drivebay sensor: LM75/DS1775. */
57 #define DS1775_TEMP 0x0
59 /* Regular bus attachment functions */
60 static int ds1775_probe(device_t);
61 static int ds1775_attach(device_t);
64 struct pmac_therm sc_sensor;
66 struct intr_config_hook enum_hook;
70 /* Utility functions */
71 static int ds1775_sensor_read(struct ds1775_softc *sc);
72 static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
73 static void ds1775_start(void *xdev);
74 static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
77 static device_method_t ds1775_methods[] = {
78 /* Device interface */
79 DEVMETHOD(device_probe, ds1775_probe),
80 DEVMETHOD(device_attach, ds1775_attach),
84 static driver_t ds1775_driver = {
87 sizeof(struct ds1775_softc)
90 static devclass_t ds1775_devclass;
92 DRIVER_MODULE(ds1775, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
95 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
100 struct iic_msg msg[2] = {
101 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
102 { addr, IIC_M_RD, 2, buf },
107 err = iicbus_transfer(dev, msg, 2);
111 *data = *((uint16_t*)buf);
115 device_printf(dev, "iicbus read failed\n");
118 pause("ds1775_read_2", hz);
123 ds1775_probe(device_t dev)
125 const char *name, *compatible;
126 struct ds1775_softc *sc;
128 name = ofw_bus_get_name(dev);
129 compatible = ofw_bus_get_compat(dev);
134 if (strcmp(name, "temp-monitor") != 0 ||
135 (strcmp(compatible, "ds1775") != 0 &&
136 strcmp(compatible, "lm75") != 0))
139 sc = device_get_softc(dev);
141 sc->sc_addr = iicbus_get_addr(dev);
143 device_set_desc(dev, "Temp-Monitor DS1775");
149 ds1775_attach(device_t dev)
151 struct ds1775_softc *sc;
153 sc = device_get_softc(dev);
155 sc->enum_hook.ich_func = ds1775_start;
156 sc->enum_hook.ich_arg = dev;
158 /* We have to wait until interrupts are enabled. I2C read and write
159 * only works if the interrupts are available.
160 * The unin/i2c is controlled by the htpic on unin. But this is not
161 * the master. The openpic on mac-io is controlling the htpic.
162 * This one gets attached after the mac-io probing and then the
163 * interrupts will be available.
166 if (config_intrhook_establish(&sc->enum_hook) != 0)
173 ds1775_start(void *xdev)
176 struct ds1775_softc *sc;
177 struct sysctl_oid *oid, *sensroot_oid;
178 struct sysctl_ctx_list *ctx;
181 char sysctl_name[40], sysctl_desc[40];
183 device_t dev = (device_t)xdev;
185 sc = device_get_softc(dev);
187 child = ofw_bus_get_node(dev);
189 ctx = device_get_sysctl_ctx(dev);
190 sensroot_oid = SYSCTL_ADD_NODE(ctx,
191 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
192 CTLFLAG_RD, 0, "DS1775 Sensor Information");
194 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
196 sc->sc_sensor.zone = 0;
198 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
199 sizeof(sc->sc_sensor.name));
202 strcpy(sysctl_name, "sensor");
204 for (i = 0; i < strlen(sc->sc_sensor.name); i++) {
205 sysctl_name[i] = tolower(sc->sc_sensor.name[i]);
206 if (isspace(sysctl_name[i]))
207 sysctl_name[i] = '_';
212 /* Make up target temperatures. These are low, for the drive bay. */
213 if (sc->sc_sensor.zone == 0) {
214 sc->sc_sensor.target_temp = 500 + ZERO_C_TO_K;
215 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
218 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
219 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
223 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
224 pmac_thermal_sensor_register(&sc->sc_sensor);
226 sprintf(sysctl_desc,"%s %s", sc->sc_sensor.name, "(C)");
227 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
228 OID_AUTO, sysctl_name, CTLFLAG_RD, 0,
229 "Sensor Information");
230 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
231 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
232 0, ds1775_sensor_sysctl, "IK", sysctl_desc);
234 config_intrhook_disestablish(&sc->enum_hook);
238 ds1775_sensor_read(struct ds1775_softc *sc)
244 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
248 read = *((int16_t *)buf);
250 /* The default mode of the ADC is 9 bit, the resolution is 0.5 C per
251 bit. The temperature is in tenth kelvin.
253 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
257 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
260 struct ds1775_softc *sc;
265 sc = device_get_softc(dev);
267 temp = ds1775_sensor_read(sc);
271 error = sysctl_handle_int(oidp, &temp, 0, req);