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      1 /*	$NetBSD: linux_acpi.c,v 1.2 2022/02/28 17:15:30 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2022 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: linux_acpi.c,v 1.2 2022/02/28 17:15:30 riastradh Exp $");
     31 
     32 #include <dev/acpi/acpireg.h>
     33 
     34 #include <linux/acpi.h>
     35 
     36 #define	_COMPONENT	ACPI_BUS_COMPONENT
     37 ACPI_MODULE_NAME("linux_acpi")
     38 
     39 union acpi_object *
     40 acpi_evaluate_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 func,
     41     union acpi_object *argv4)
     42 {
     43 	ACPI_OBJECT_LIST arg;
     44 	ACPI_OBJECT params[4];
     45 	ACPI_BUFFER buf;
     46 	ACPI_STATUS rv;
     47 
     48 	if (handle == NULL)
     49 		handle = ACPI_ROOT_OBJECT;
     50 
     51 	arg.Count = 4;
     52 	arg.Pointer = params;
     53 	params[0].Type = ACPI_TYPE_BUFFER;
     54 	params[0].Buffer.Length = 16;
     55 	params[0].Buffer.Pointer = (char *)__UNCONST(uuid);
     56 	params[1].Type = ACPI_TYPE_INTEGER;
     57 	params[1].Integer.Value = rev;
     58 	params[2].Type = ACPI_TYPE_INTEGER;
     59 	params[2].Integer.Value = func;
     60 	if (argv4 != NULL) {
     61 		params[3] = *argv4;
     62 	} else {
     63 		params[3].Type = ACPI_TYPE_PACKAGE;
     64 		params[3].Package.Count = 0;
     65 		params[3].Package.Elements = NULL;
     66 	}
     67 
     68 	buf.Pointer = NULL;
     69 	buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
     70 
     71 	rv = AcpiEvaluateObject(handle, "_DSM", &arg, &buf);
     72 	if (ACPI_SUCCESS(rv))
     73 		return (ACPI_OBJECT *)buf.Pointer;
     74 	return NULL;
     75 }
     76 
     77 union acpi_object *
     78 acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *uuid, u64 rev,
     79     u64 func, union acpi_object *argv4, acpi_object_type type)
     80 {
     81 	union acpi_object *obj;
     82 
     83 	obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
     84 	if (obj != NULL && obj->Type != type) {
     85 		ACPI_FREE(obj);
     86 		obj = NULL;
     87 	}
     88 	return obj;
     89 }
     90 
     91 #define	ACPI_INIT_DSM_ARGV4(cnt, eles)		\
     92 {						\
     93 	.Package.Type = ACPI_TYPE_PACKAGE,	\
     94 	.Package.Count = (cnt),			\
     95 	.Package.Elements = (eles)		\
     96 }
     97 
     98 bool
     99 acpi_check_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 funcs)
    100 {
    101 	ACPI_OBJECT *obj;
    102 	uint64_t mask = 0;
    103 	int i;
    104 
    105 	if (funcs == 0)
    106 		return false;
    107 
    108 	obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL);
    109 	if (obj == NULL)
    110 		return false;
    111 
    112 	if (obj->Type == ACPI_TYPE_INTEGER)
    113 		mask = obj->Integer.Value;
    114 	else if (obj->Type == ACPI_TYPE_BUFFER)
    115 		for (i = 0; i < obj->Buffer.Length && i < 8; i++)
    116 			mask |= (uint64_t)obj->Buffer.Pointer[i] << (i * 8);
    117 	ACPI_FREE(obj);
    118 
    119 	if ((mask & 0x1) == 0x1 && (mask & funcs) == funcs)
    120 		return true;
    121 	return false;
    122 }
    123