1 /*- 2 * Copyright (c) 2000 Michael Smith 3 * Copyright (c) 2000 BSDi 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 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. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, 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 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include "opt_acpi.h" 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/bus.h> 34 35 #include "acpi.h" 36 37 #include <dev/acpica/acpivar.h> 38 39 #define TZ_KELVTOC(x) (((x) - 2732) / 10), (((x) - 2732) % 10) 40 41 struct acpi_tz_softc { 42 device_t tz_dev; 43 ACPI_HANDLE tz_handle; 44 }; 45 46 static int acpi_tz_probe(device_t dev); 47 static int acpi_tz_attach(device_t dev); 48 49 static device_method_t acpi_tz_methods[] = { 50 /* Device interface */ 51 DEVMETHOD(device_probe, acpi_tz_probe), 52 DEVMETHOD(device_attach, acpi_tz_attach), 53 54 {0, 0} 55 }; 56 57 static driver_t acpi_tz_driver = { 58 "acpi_tz", 59 acpi_tz_methods, 60 sizeof(struct acpi_tz_softc), 61 }; 62 63 devclass_t acpi_tz_devclass; 64 DRIVER_MODULE(acpi_tz, acpi, acpi_tz_driver, acpi_tz_devclass, 0, 0); 65 66 static int 67 acpi_tz_probe(device_t dev) 68 { 69 if (acpi_get_type(dev) == ACPI_TYPE_THERMAL) { 70 device_set_desc(dev, "thermal zone"); 71 return(0); 72 } 73 return(ENXIO); 74 } 75 76 static int 77 acpi_tz_attach(device_t dev) 78 { 79 struct acpi_tz_softc *sc; 80 UINT32 param[4]; 81 ACPI_BUFFER buf; 82 ACPI_STATUS status; 83 84 sc = device_get_softc(dev); 85 sc->tz_dev = dev; 86 sc->tz_handle = acpi_get_handle(dev); 87 88 buf.Pointer = ¶m[0]; 89 buf.Length = sizeof(param); 90 if ((status = AcpiEvaluateObject(sc->tz_handle, "_TMP", NULL, &buf)) != AE_OK) { 91 device_printf(sc->tz_dev, "can't fetch temperature - %s\n", acpi_strerror(status)); 92 return(ENXIO); 93 } 94 if (param[0] != ACPI_TYPE_NUMBER) { 95 device_printf(sc->tz_dev, "%s._TMP does not evaluate to ACPI_TYPE_NUMBER\n", 96 acpi_name(sc->tz_handle)); 97 return(ENXIO); 98 } 99 device_printf(sc->tz_dev, "current temperature %d.%dC\n", TZ_KELVTOC(param[1])); 100 101 return(0); 102 } 103