Add a new driver, the ad7417, to read temperatures and voltages on some

PowerMac's.

Approved by:	nwhitehorn (mentor)

5 files changed, 461 insertions, 0 deletions

diff --git a/sys/conf/files.powerpc b/sys/conf/files.powerpc
index 7e72b19..7d4e2a2 100644
--- a/sys/conf/files.powerpc
+++ b/sys/conf/files.powerpc
@@ -27,6 +27,7 @@ dev/cfi/cfi_bus_fdt.c		optional	cfi fdt
 dev/fb/fb.c			optional	sc
 dev/fdt/fdt_powerpc.c		optional	fdt
 dev/hwpmc/hwpmc_powerpc.c	optional	hwpmc
+dev/iicbus/ad7417.c		optional	ad7417 powermac
 dev/iicbus/ds1775.c		optional	ds1775 powermac
 dev/iicbus/max6690.c		optional	max6690 powermac
 dev/kbd/kbd.c			optional	sc
diff --git a/sys/dev/iicbus/ad7417.c b/sys/dev/iicbus/ad7417.c
new file mode 100644
index 0000000..aa26d6f
--- /dev/null
+++ b/sys/dev/iicbus/ad7417.c
@@ -0,0 +1,457 @@
+/*-
+ * 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
+
+/* CPU A/B sensors, temp and adc: AD7417. */
+
+#define AD7417_TEMP         0x00
+#define AD7417_CONFIG       0x01
+#define AD7417_ADC          0x04
+#define AD7417_CONFIG2      0x05
+#define AD7417_CONFMASK     0xe0
+
+uint8_t adc741x_config;
+
+struct ad7417_sensor {
+	int     id;
+	char    location[32];
+	enum {
+		ADC7417_TEMP_SENSOR,
+		ADC7417_ADC_SENSOR
+	} type;
+};
+
+/* Regular bus attachment functions */
+static int ad7417_probe(device_t);
+static int ad7417_attach(device_t);
+
+/* Utility functions */
+static int ad7417_sensor_sysctl(SYSCTL_HANDLER_ARGS);
+static int ad7417_write(device_t dev, uint32_t addr, uint8_t reg,
+			uint8_t *buf, int len);
+static int ad7417_read_1(device_t dev, uint32_t addr, uint8_t reg,
+			 uint8_t *data);
+static int ad7417_read_2(device_t dev, uint32_t addr, uint8_t reg,
+			 uint16_t *data);
+
+struct ad7417_softc {
+	device_t		sc_dev;
+	uint32_t                sc_addr;
+	struct ad7417_sensor    *sc_sensors;
+	int                     sc_nsensors;
+};
+static device_method_t  ad7417_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		ad7417_probe),
+	DEVMETHOD(device_attach,	ad7417_attach),
+	{ 0, 0 },
+};
+
+static driver_t ad7417_driver = {
+	"ad7417",
+	ad7417_methods,
+	sizeof(struct ad7417_softc)
+};
+
+static devclass_t ad7417_devclass;
+
+DRIVER_MODULE(ad7417, iicbus, ad7417_driver, ad7417_devclass, 0, 0);
+MALLOC_DEFINE(M_AD7417, "ad7417", "Supply-Monitor AD7417");
+
+
+static int
+ad7417_write(device_t dev, uint32_t addr, uint8_t reg, uint8_t *buff, int len)
+{
+	unsigned char buf[4];
+	struct iic_msg msg[] = {
+		{ addr, IIC_M_WR, 0, buf }
+	};
+
+	msg[0].len = len + 1;
+	buf[0] = reg;
+	memcpy(buf + 1, buff, len);
+
+	if (iicbus_transfer(dev, msg, 1) != 0) {
+		device_printf(dev, "iicbus write failed\n");
+		return (EIO);
+	}
+
+	return (0);
+
+}
+
+static int
+ad7417_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
+ad7417_read_2(device_t dev, uint32_t addr, uint8_t reg, uint16_t *data)
+{
+	uint8_t buf[4];
+
+	struct iic_msg msg[2] = {
+	    { addr, IIC_M_WR | IIC_M_NOSTOP, 1, &reg },
+	    { addr, IIC_M_RD, 2, buf },
+	};
+
+	if (iicbus_transfer(dev, msg, 2) != 0) {
+		device_printf(dev, "iicbus read failed\n");
+		return (EIO);
+	}
+
+	*data = *((uint16_t*)buf);
+
+	return (0);
+}
+
+static int
+ad7417_init_adc(device_t dev, uint32_t addr)
+{
+	uint8_t buf;
+
+	adc741x_config = 0;
+	/* Clear Config2 */
+	buf = 0;
+	ad7417_write(dev, addr, AD7417_CONFIG2, &buf, 1);
+
+	 /* Read & cache Config1 */
+	buf = 0;
+	ad7417_write(dev, addr, AD7417_CONFIG, &buf, 1);
+
+	ad7417_read_1(dev, addr, AD7417_CONFIG, &buf);
+	adc741x_config = (uint8_t)buf;
+
+	/* Disable shutdown mode */
+	adc741x_config &= 0xfe;
+	buf = adc741x_config;
+	ad7417_write(dev, addr, AD7417_CONFIG, &buf, 1);
+
+	return (0);
+
+}
+static int
+ad7417_probe(device_t dev)
+{
+	const char  *name, *compatible;
+	struct ad7417_softc *sc;
+
+	name = ofw_bus_get_name(dev);
+	compatible = ofw_bus_get_compat(dev);
+
+	if (!name)
+		return (ENXIO);
+
+	if (strcmp(name, "supply-monitor") != 0 ||
+	    strcmp(compatible, "ad7417") != 0)
+		return (ENXIO);
+
+	sc = device_get_softc(dev);
+	sc->sc_dev = dev;
+	sc->sc_addr = iicbus_get_addr(dev);
+
+	device_set_desc(dev, "Supply-Monitor AD7417");
+
+	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
+ad7417_fill_sensor_prop(device_t dev)
+{
+	phandle_t child;
+	struct ad7417_softc *sc;
+	u_int id[10];
+	char location[96];
+	char type[32];
+	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 fan type property. */
+	len = 0;
+	i = 0;
+	prev_len = 0;
+	prop_len = OF_getprop(child, "hwsensor-type", type, sizeof(type));
+	while (len < prop_len) {
+		if (strcmp(type + len, "temperature") == 0)
+			sc->sc_sensors[i].type = ADC7417_TEMP_SENSOR;
+		else
+			sc->sc_sensors[i].type = ADC7417_ADC_SENSOR;
+		prev_len = strlen(type + len) + 1;
+		len += prev_len;
+		i++;
+	}
+
+	/* Fill the sensor id property. Taken from OF. */
+	prop_len = OF_getprop(child, "hwsensor-id", id, sizeof(id));
+	for (j = 0; j < i; j++)
+		sc->sc_sensors[j].id = id[j];
+
+	return (i);
+}
+
+static int
+ad7417_attach(device_t dev)
+{
+	struct ad7417_softc *sc;
+	struct sysctl_oid *oid, *sensroot_oid;
+	struct sysctl_ctx_list *ctx;
+	char sysctl_name[32];
+	int i, j;
+	const char *unit;
+	const char *desc;
+
+	sc = device_get_softc(dev);
+
+	sc->sc_nsensors = 0;
+
+	/* Count the actual number of sensors. */
+	sc->sc_nsensors = ad7417_fill_sensor_prop(dev);
+
+	device_printf(dev, "%d sensors detected.\n", sc->sc_nsensors);
+
+	if (sc->sc_nsensors == 0)
+		device_printf(dev, "WARNING: No AD7417 sensors detected!\n");
+
+	sc->sc_sensors = malloc (sc->sc_nsensors * sizeof(struct ad7417_sensor),
+				 M_AD7417, 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, "AD7417 Sensor Information");
+
+	/* Now we can fill the properties into the allocated struct. */
+	sc->sc_nsensors = ad7417_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");
+
+		if (sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR) {
+			unit = "temp";
+			desc = "Sensor temp in C";
+		} else {
+			unit = "volt";
+			desc = "Sensor Volt in V";
+		}
+		/* I use i to pass the sensor id. */
+		SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
+				unit, CTLTYPE_INT | CTLFLAG_RD, dev,
+				i, ad7417_sensor_sysctl,
+				sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR ?
+				"IK" : "I", desc);
+	}
+	/* Dump sensor location, ID & type. */
+	if (bootverbose) {
+		device_printf(dev, "Sensors\n");
+		for (i = 0; i < sc->sc_nsensors; i++) {
+			device_printf(dev, "Location: %s ID: %d type: %d\n",
+				      sc->sc_sensors[i].location,
+				      sc->sc_sensors[i].id,
+				      sc->sc_sensors[i].type);
+		}
+	}
+
+	return (0);
+}
+
+static int
+ad7417_get_temp(device_t dev, uint32_t addr, int *temp)
+{
+	uint16_t buf[2];
+	uint16_t read;
+
+	ad7417_read_2(dev, addr, AD7417_TEMP, buf);
+	read = *((int16_t*)buf);
+
+	/* The ADC is 10 bit, the resolution is 0.25 C.
+	   The temperature is in tenth kelvin.
+	*/
+	*temp = (((int16_t)(read & 0xffc0)) >> 6) * 25 / 10;
+	return (0);
+}
+
+static int
+ad7417_get_adc(device_t dev, uint32_t addr, unsigned int *value,
+	       uint8_t chan)
+{
+	uint8_t cfg1, tmp;
+	uint16_t read, buf[2];
+
+	ad7417_read_1(dev, addr, AD7417_CONFIG, &cfg1);
+
+	tmp = chan << 5;
+
+	cfg1 = (cfg1 & ~AD7417_CONFMASK) | (tmp & AD7417_CONFMASK);
+
+	ad7417_write(dev, addr, AD7417_CONFIG, &cfg1, 1);
+
+	ad7417_read_2(dev, addr, AD7417_ADC, buf);
+
+	read = *((uint16_t*)buf);
+
+	*value = ((uint32_t)read) >> 6;
+
+	return (0);
+}
+
+static int
+ad7417_sensor_read(device_t dev, struct ad7417_sensor *sens, int *temp)
+{
+	struct ad7417_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	/* Init the ADC. */
+	ad7417_init_adc(sc->sc_dev, sc->sc_addr);
+
+	if (sens->type == ADC7417_TEMP_SENSOR) {
+		ad7417_get_temp(sc->sc_dev, sc->sc_addr, temp);
+		*temp += FCU_ZERO_C_TO_K;
+	} else {
+		uint8_t chan;
+		switch (sens->id) {
+		case 11:
+		case 16:
+			chan = 1;
+			break;
+		case 12:
+		case 17:
+			chan = 2;
+			break;
+		case 13:
+		case 18:
+			chan = 3;
+			break;
+		case 14:
+		case 19:
+			chan = 4;
+			break;
+		default:
+			chan = 1;
+		}
+
+		ad7417_get_adc(sc->sc_dev, sc->sc_addr, temp, chan);
+	}
+	return (0);
+}
+
+static int
+ad7417_sensor_sysctl(SYSCTL_HANDLER_ARGS)
+{
+	device_t dev;
+	struct ad7417_softc *sc;
+	struct ad7417_sensor *sens;
+	int value = 0;
+	int error;
+	int temp;
+
+	dev = arg1;
+	sc = device_get_softc(dev);
+	sens = &sc->sc_sensors[arg2];
+
+	error = ad7417_sensor_read(dev, sens, &value);
+	if (error != 0)
+		return (error);
+
+	temp = value;
+
+	error = sysctl_handle_int(oidp, &temp, 0, req);
+
+	return (error);
+}
diff --git a/sys/powerpc/conf/GENERIC b/sys/powerpc/conf/GENERIC
index d221a97..af4b19a 100644
--- a/sys/powerpc/conf/GENERIC
+++ b/sys/powerpc/conf/GENERIC
@@ -174,6 +174,7 @@ device		sbp		# SCSI over FireWire (Requires scbus and da)
 device		fwe		# Ethernet over FireWire (non-standard!)
 
 # Misc
+device          ad7417          # PowerMac7,2 temperature sensor
 device		ds1775		# PowerMac7,2 temperature sensor
 device		fcu		# Apple Fan Control Unit
 device		max6690		# PowerMac7,2 temperature sensor
diff --git a/sys/powerpc/conf/GENERIC64 b/sys/powerpc/conf/GENERIC64
index d7526b3..ab4a0dc 100644
--- a/sys/powerpc/conf/GENERIC64
+++ b/sys/powerpc/conf/GENERIC64
@@ -175,6 +175,7 @@ device		sbp		# SCSI over FireWire (Requires scbus and da)
 device		fwe		# Ethernet over FireWire (non-standard!)
 
 # Misc
+device          ad7417          # PowerMac7,2 temperature sensor
 device		ds1775		# PowerMac7,2 temperature sensor
 device		fcu		# Apple Fan Control Unit
 device		max6690		# PowerMac7,2 temperature sensor
diff --git a/sys/powerpc/conf/NOTES b/sys/powerpc/conf/NOTES
index b80a817..374106d 100644
--- a/sys/powerpc/conf/NOTES
+++ b/sys/powerpc/conf/NOTES
@@ -39,6 +39,7 @@ device		kiic		# Apple Keywest I2C Controller
 device		ofwd		# Open Firmware disks
 device		adb		# Apple Desktop Bus
 device		cuda		# VIA-CUDA ADB interface
+device          ad7417          # PowerMac7,2 temperature sensor
 device		ds1775		# PowerMac7,2 temperature sensor
 device		fcu		# Apple Fan Control Unit
 device		max6690		# PowerMac7,2 temperature sensor