From a69e8faa90e4070a65302cf076ac04b9186fa622 Mon Sep 17 00:00:00 2001
From: msmith <msmith@FreeBSD.org>
Date: Sat, 28 Oct 2000 06:59:48 +0000
Subject: Initial FreeBSD OSPM (operating system power management) modules for
 ACPICA.  Most of these are still works in progress.  Support exists for:

 - Fixed feature and control method power, lid and sleep buttons.
 - Detection of ISA PnP devices using ACPI namespace.
 - Detection of PCI root busses using ACPI namespace.
 - CPU throttling and sleep states (incomplete)
 - Thermal monitoring and cooling control (incomplete)
 - Interface to platform embedded controllers (mostly complete)
 - ACPI timer (incomplete)
 - Simple userland control of sleep states.
 - Shutdown and poweroff.
---
 sys/dev/acpica/acpi_thermal.c | 102 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 sys/dev/acpica/acpi_thermal.c

(limited to 'sys/dev/acpica/acpi_thermal.c')

diff --git a/sys/dev/acpica/acpi_thermal.c b/sys/dev/acpica/acpi_thermal.c
new file mode 100644
index 0000000..45398fe
--- /dev/null
+++ b/sys/dev/acpica/acpi_thermal.c
@@ -0,0 +1,102 @@
+/*-
+ * Copyright (c) 2000 Michael Smith
+ * Copyright (c) 2000 BSDi
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ *	$FreeBSD$
+ */
+
+#include "opt_acpi.h"
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+
+#include "acpi.h"
+
+#include <dev/acpica/acpivar.h>
+
+#define TZ_KELVTOC(x)	(((x) - 2732) / 10), (((x) - 2732) % 10)
+
+struct acpi_tz_softc {
+    device_t	tz_dev;
+    ACPI_HANDLE	tz_handle;
+};
+
+static int	acpi_tz_probe(device_t dev);
+static int	acpi_tz_attach(device_t dev);
+
+static device_method_t acpi_tz_methods[] = {
+    /* Device interface */
+    DEVMETHOD(device_probe,	acpi_tz_probe),
+    DEVMETHOD(device_attach,	acpi_tz_attach),
+
+    {0, 0}
+};
+
+static driver_t acpi_tz_driver = {
+    "acpi_tz",
+    acpi_tz_methods,
+    sizeof(struct acpi_tz_softc),
+};
+
+devclass_t acpi_tz_devclass;
+DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0);
+
+static int
+acpi_tz_probe(device_t dev)
+{
+    if (acpi_get_type(dev) == ACPI_TYPE_THERMAL) {
+	device_set_desc(dev, "thermal zone");
+	return(0);
+    }
+    return(ENXIO);
+}
+
+static int
+acpi_tz_attach(device_t dev)
+{
+    struct acpi_tz_softc	*sc;
+    UINT32			param[4];
+    ACPI_BUFFER			buf;
+    ACPI_STATUS			status;
+
+    sc = device_get_softc(dev);
+    sc->tz_dev = dev;
+    sc->tz_handle = acpi_get_handle(dev);
+
+    buf.Pointer = &param[0];
+    buf.Length = sizeof(param);
+    if ((status = AcpiEvaluateObject(sc->tz_handle, "_TMP", NULL, &buf)) != AE_OK) {
+	device_printf(sc->tz_dev, "can't fetch temperature - %s\n", acpi_strerror(status));
+	return(ENXIO);
+    }
+    if (param[0] != ACPI_TYPE_NUMBER) {
+	device_printf(sc->tz_dev, "%s._TMP does not evaluate to ACPI_TYPE_NUMBER\n", 
+		      acpi_name(sc->tz_handle));
+	return(ENXIO);
+    }
+    device_printf(sc->tz_dev, "current temperature %d.%dC\n", TZ_KELVTOC(param[1]));
+    
+    return(0);
+}
-- 
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