2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010 Andreas Tobler
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/module.h>
35 #include <sys/callout.h>
38 #include <sys/ctype.h>
39 #include <sys/kernel.h>
40 #include <sys/reboot.h>
42 #include <sys/sysctl.h>
43 #include <sys/limits.h>
45 #include <machine/bus.h>
46 #include <machine/md_var.h>
48 #include <dev/iicbus/iicbus.h>
49 #include <dev/iicbus/iiconf.h>
51 #include <dev/ofw/openfirm.h>
52 #include <dev/ofw/ofw_bus.h>
53 #include <powerpc/powermac/powermac_thermal.h>
55 /* Drivebay sensor: LM75/DS1775. */
56 #define DS1775_TEMP 0x0
58 /* Regular bus attachment functions */
59 static int ds1775_probe(device_t);
60 static int ds1775_attach(device_t);
63 struct pmac_therm sc_sensor;
65 struct intr_config_hook enum_hook;
69 /* Utility functions */
70 static int ds1775_sensor_read(struct ds1775_softc *sc);
71 static int ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS);
72 static void ds1775_start(void *xdev);
73 static int ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg,
76 static device_method_t ds1775_methods[] = {
77 /* Device interface */
78 DEVMETHOD(device_probe, ds1775_probe),
79 DEVMETHOD(device_attach, ds1775_attach),
83 static driver_t ds1775_driver = {
86 sizeof(struct ds1775_softc)
89 static devclass_t ds1775_devclass;
91 DRIVER_MODULE(ds1775, iicbus, ds1775_driver, ds1775_devclass, 0, 0);
94 ds1775_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
99 struct iic_msg msg[2] = {
100 { addr, IIC_M_WR | IIC_M_NOSTOP, 1, ® },
101 { addr, IIC_M_RD, 2, buf },
106 err = iicbus_transfer(dev, msg, nitems(msg));
110 *data = *((uint16_t*)buf);
114 device_printf(dev, "iicbus read failed\n");
117 pause("ds1775_read_2", hz);
122 ds1775_probe(device_t dev)
124 const char *name, *compatible;
125 struct ds1775_softc *sc;
127 name = ofw_bus_get_name(dev);
128 compatible = ofw_bus_get_compat(dev);
133 if (strcmp(name, "temp-monitor") != 0 ||
134 (strcmp(compatible, "ds1775") != 0 &&
135 strcmp(compatible, "lm75") != 0))
138 sc = device_get_softc(dev);
140 sc->sc_addr = iicbus_get_addr(dev);
142 device_set_desc(dev, "Temp-Monitor DS1775");
148 ds1775_attach(device_t dev)
150 struct ds1775_softc *sc;
152 sc = device_get_softc(dev);
154 sc->enum_hook.ich_func = ds1775_start;
155 sc->enum_hook.ich_arg = dev;
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.
165 if (config_intrhook_establish(&sc->enum_hook) != 0)
172 ds1775_start(void *xdev)
175 struct ds1775_softc *sc;
176 struct sysctl_oid *oid, *sensroot_oid;
177 struct sysctl_ctx_list *ctx;
180 char sysctl_name[40], sysctl_desc[40];
182 device_t dev = (device_t)xdev;
184 sc = device_get_softc(dev);
186 child = ofw_bus_get_node(dev);
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");
193 if (OF_getprop(child, "hwsensor-zone", &sc->sc_sensor.zone,
195 sc->sc_sensor.zone = 0;
197 plen = OF_getprop(child, "hwsensor-location", sc->sc_sensor.name,
198 sizeof(sc->sc_sensor.name));
201 strcpy(sysctl_name, "sensor");
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] = '_';
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;
217 sc->sc_sensor.target_temp = 300 + ZERO_C_TO_K;
218 sc->sc_sensor.max_temp = 600 + ZERO_C_TO_K;
222 (int (*)(struct pmac_therm *sc))(ds1775_sensor_read);
223 pmac_thermal_sensor_register(&sc->sc_sensor);
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);
233 config_intrhook_disestablish(&sc->enum_hook);
237 ds1775_sensor_read(struct ds1775_softc *sc)
243 err = ds1775_read_2(sc->sc_dev, sc->sc_addr, DS1775_TEMP, buf);
247 read = *((int16_t *)buf);
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.
252 return (((int16_t)(read) >> 7) * 5 + ZERO_C_TO_K);
256 ds1775_sensor_sysctl(SYSCTL_HANDLER_ARGS)
259 struct ds1775_softc *sc;
264 sc = device_get_softc(dev);
266 temp = ds1775_sensor_read(sc);
270 error = sysctl_handle_int(oidp, &temp, 0, req);