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-rw-r--r--sys/dev/iicbus/max6690.c335
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diff --git a/sys/dev/iicbus/max6690.c b/sys/dev/iicbus/max6690.c
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+/*-
+ * Copyright (c) 2010 Andreas Tobler
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/callout.h>
+#include <sys/conf.h>
+#include <sys/cpu.h>
+#include <sys/ctype.h>
+#include <sys/kernel.h>
+#include <sys/reboot.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+#include <sys/limits.h>
+
+#include <machine/bus.h>
+#include <machine/md_var.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+
+#define FCU_ZERO_C_TO_K 2732
+
+/* Inlet, Backside, U3 Heatsink sensor: MAX6690. */
+
+#define MAX6690_INT_TEMP 0x0
+#define MAX6690_EXT_TEMP 0x1
+#define MAX6690_EEXT_TEMP 0x10
+#define MAX6690_IEXT_TEMP 0x11
+#define MAX6690_TEMP_MASK 0xe0
+
+struct max6690_sensor {
+ int id;
+ char location[32];
+};
+
+/* Regular bus attachment functions */
+static int max6690_probe(device_t);
+static int max6690_attach(device_t);
+
+/* Utility functions */
+static int max6690_sensor_sysctl(SYSCTL_HANDLER_ARGS);
+static void max6690_start(void *xdev);
+static int max6690_read_1(device_t dev, uint32_t addr, uint8_t reg,
+ uint8_t *data);
+
+struct max6690_softc {
+ device_t sc_dev;
+ struct intr_config_hook enum_hook;
+ uint32_t sc_addr;
+ struct max6690_sensor *sc_sensors;
+ int sc_nsensors;
+};
+static device_method_t max6690_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, max6690_probe),
+ DEVMETHOD(device_attach, max6690_attach),
+ { 0, 0 },
+};
+
+static driver_t max6690_driver = {
+ "max6690",
+ max6690_methods,
+ sizeof(struct max6690_softc)
+};
+
+static devclass_t max6690_devclass;
+
+DRIVER_MODULE(max6690, iicbus, max6690_driver, max6690_devclass, 0, 0);
+MALLOC_DEFINE(M_MAX6690, "max6690", "Temp-Monitor MAX6690");
+
+static int
+max6690_read_1(device_t dev, uint32_t addr, uint8_t reg, uint8_t *data)
+{
+ uint8_t buf[4];
+
+ struct iic_msg msg[2] = {
+ { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
+ { addr, IIC_M_RD, 1, buf },
+ };
+
+ if (iicbus_transfer(dev, msg, 2) != 0) {
+ device_printf(dev, "iicbus read failed\n");
+ return (EIO);
+ }
+
+ *data = *((uint8_t*)buf);
+
+ return (0);
+}
+
+static int
+max6690_probe(device_t dev)
+{
+ const char *name, *compatible;
+ struct max6690_softc *sc;
+
+ name = ofw_bus_get_name(dev);
+ compatible = ofw_bus_get_compat(dev);
+
+ if (!name)
+ return (ENXIO);
+
+ if (strcmp(name, "temp-monitor") != 0 ||
+ strcmp(compatible, "max6690") != 0)
+ return (ENXIO);
+
+ sc = device_get_softc(dev);
+ sc->sc_dev = dev;
+ sc->sc_addr = iicbus_get_addr(dev);
+
+ device_set_desc(dev, "Temp-Monitor MAX6690");
+
+ return (0);
+}
+
+/*
+ * This function returns the number of sensors. If we call it the second time
+ * and we have allocated memory for sc->sc_sensors, we fill in the properties.
+ */
+static int
+max6690_fill_sensor_prop(device_t dev)
+{
+ phandle_t child;
+ struct max6690_softc *sc;
+ u_int id[8];
+ char location[96];
+ int i = 0, j, len = 0, prop_len, prev_len = 0;
+
+ sc = device_get_softc(dev);
+
+ child = ofw_bus_get_node(dev);
+
+ /* Fill the sensor location property. */
+ prop_len = OF_getprop(child, "hwsensor-location", location,
+ sizeof(location));
+ while (len < prop_len) {
+ if (sc->sc_sensors != NULL)
+ strcpy(sc->sc_sensors[i].location, location + len);
+ prev_len = strlen(location + len) + 1;
+ len += prev_len;
+ i++;
+ }
+ if (sc->sc_sensors == NULL)
+ return (i);
+
+ /* Fill the sensor id property. */
+ prop_len = OF_getprop(child, "hwsensor-id", id, sizeof(id));
+ for (j = 0; j < i; j++)
+ sc->sc_sensors[j].id = (id[j] & 0xf);
+
+ return (i);
+}
+static int
+max6690_attach(device_t dev)
+{
+ struct max6690_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ sc->enum_hook.ich_func = max6690_start;
+ sc->enum_hook.ich_arg = dev;
+
+ /* We have to wait until interrupts are enabled. I2C read and write
+ * only works if the interrupts are available.
+ * The unin/i2c is controlled by the htpic on unin. But this is not
+ * the master. The openpic on mac-io is controlling the htpic.
+ * This one gets attached after the mac-io probing and then the
+ * interrupts will be available.
+ */
+
+ if (config_intrhook_establish(&sc->enum_hook) != 0)
+ return (ENOMEM);
+
+ return (0);
+}
+
+static void
+max6690_start(void *xdev)
+{
+ phandle_t child;
+ struct max6690_softc *sc;
+ struct sysctl_oid *oid, *sensroot_oid;
+ struct sysctl_ctx_list *ctx;
+ char sysctl_name[32];
+ int i, j;
+
+ device_t dev = (device_t)xdev;
+
+ sc = device_get_softc(dev);
+
+ sc->sc_nsensors = 0;
+
+ child = ofw_bus_get_node(dev);
+
+ /* Count the actual number of sensors. */
+ sc->sc_nsensors = max6690_fill_sensor_prop(dev);
+
+ device_printf(dev, "%d sensors detected.\n", sc->sc_nsensors);
+
+ if (sc->sc_nsensors == 0)
+ device_printf(dev, "WARNING: No MAX6690 sensors detected!\n");
+
+ sc->sc_sensors = malloc (sc->sc_nsensors * sizeof(struct max6690_sensor),
+ M_MAX6690, M_WAITOK | M_ZERO);
+
+ ctx = device_get_sysctl_ctx(dev);
+ sensroot_oid = SYSCTL_ADD_NODE(ctx,
+ SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "sensor",
+ CTLFLAG_RD, 0, "MAX6690 Sensor Information");
+
+ /* Now we can fill the properties into the allocated struct. */
+ sc->sc_nsensors = max6690_fill_sensor_prop(dev);
+
+ /* Add sysctls for the sensors. */
+ for (i = 0; i < sc->sc_nsensors; i++) {
+ for (j = 0; j < strlen(sc->sc_sensors[i].location); j++) {
+ sysctl_name[j] = tolower(sc->sc_sensors[i].location[j]);
+ if (isspace(sysctl_name[j]))
+ sysctl_name[j] = '_';
+ }
+ sysctl_name[j] = 0;
+
+ oid = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sensroot_oid),
+ OID_AUTO,
+ sysctl_name, CTLFLAG_RD, 0,
+ "Sensor Information");
+ /* I use i to pass the sensor id. */
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temp",
+ CTLTYPE_INT | CTLFLAG_RD, dev, i % 2,
+ max6690_sensor_sysctl, "IK",
+ "Sensor Temp in °C");
+
+ }
+ /* Dump sensor location & ID. */
+ if (bootverbose) {
+ device_printf(dev, "Sensors\n");
+ for (i = 0; i < sc->sc_nsensors; i++) {
+ device_printf(dev, "Location : %s ID: %d\n",
+ sc->sc_sensors[i].location,
+ sc->sc_sensors[i].id);
+ }
+ }
+
+ config_intrhook_disestablish(&sc->enum_hook);
+}
+
+static int
+max6690_sensor_read(device_t dev, struct max6690_sensor *sens, int *temp)
+{
+ uint8_t reg_int = 0, reg_ext = 0;
+ uint8_t integer;
+ uint8_t fraction;
+ struct max6690_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ /* The internal sensor id's are even, the external ar odd. */
+ if ((sens->id % 2) == 0) {
+ reg_int = MAX6690_INT_TEMP;
+ reg_ext = MAX6690_IEXT_TEMP;
+ } else {
+ reg_int = MAX6690_EXT_TEMP;
+ reg_ext = MAX6690_EEXT_TEMP;
+ }
+
+ max6690_read_1(sc->sc_dev, sc->sc_addr, reg_int, &integer);
+
+ max6690_read_1(sc->sc_dev, sc->sc_addr, reg_ext, &fraction);
+
+ fraction &= MAX6690_TEMP_MASK;
+
+ /* The temperature is in tenth kelvin, the fractional part resolution
+ is 0.125.
+ */
+ *temp = (integer * 10) + (fraction >> 5) * 10 / 8;
+
+ return (0);
+}
+
+static int
+max6690_sensor_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ device_t dev;
+ struct max6690_softc *sc;
+ struct max6690_sensor *sens;
+ int value = 0;
+ int error;
+ unsigned int temp;
+
+ dev = arg1;
+ sc = device_get_softc(dev);
+ sens = &sc->sc_sensors[arg2];
+
+ error = max6690_sensor_read(dev, sens, &value);
+ if (error != 0)
+ return (error);
+
+ temp = value + FCU_ZERO_C_TO_K;
+
+ error = sysctl_handle_int(oidp, &temp, 0, req);
+
+ return (error);
+}
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