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2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f 
 kernel/drivers/acpi/utils.c
....@@ -1,22 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
34  *
45  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
56  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6
- *
7
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8
- *
9
- *  This program is free software; you can redistribute it and/or modify
10
- *  it under the terms of the GNU General Public License as published by
11
- *  the Free Software Foundation; either version 2 of the License, or (at
12
- *  your option) any later version.
13
- *
14
- *  This program is distributed in the hope that it will be useful, but
15
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- *  General Public License for more details.
18
- *
19
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
207  */
218 
229 #include <linux/kernel.h>
....@@ -117,7 +104,6 @@
117104 					      " [%c]\n",
118105 					      i, format_string[i]);
119106 				return AE_BAD_DATA;
120
-				break;
121107 			}
122108 			break;
123109 
....@@ -142,7 +128,6 @@
142128 					      " expecting [%c]\n",
143129 					      i, format_string[i]);
144130 				return AE_BAD_DATA;
145
-				break;
146131 			}
147132 			break;
148133 		case ACPI_TYPE_LOCAL_REFERENCE:
....@@ -157,7 +142,6 @@
157142 					      " expecting [%c]\n",
158143 					      i, format_string[i]);
159144 				return AE_BAD_DATA;
160
-				break;
161145 			}
162146 			break;
163147 
....@@ -168,7 +152,6 @@
168152 					  i));
169153 			/* TBD: handle nested packages... */
170154 			return AE_SUPPORT;
171
-			break;
172155 		}
173156 	}
174157 
....@@ -468,6 +451,7 @@
468451 
469452 /**
470453  * acpi_handle_path: Return the object path of handle
454
+ * @handle: ACPI device handle
471455  *
472456  * Caller must free the returned buffer
473457  */
....@@ -486,6 +470,9 @@
486470 
487471 /**
488472  * acpi_handle_printk: Print message with ACPI prefix and object path
473
+ * @level: log level
474
+ * @handle: ACPI device handle
475
+ * @fmt: format string
489476  *
490477  * This function is called through acpi_handle_<level> macros and prints
491478  * a message with ACPI prefix and object path.  This function acquires
....@@ -514,6 +501,9 @@
514501 #if defined(CONFIG_DYNAMIC_DEBUG)
515502 /**
516503  * __acpi_handle_debug: pr_debug with ACPI prefix and object path
504
+ * @descriptor: Dynamic Debug descriptor
505
+ * @handle: ACPI device handle
506
+ * @fmt: format string
517507  *
518508  * This function is called through acpi_handle_debug macro and debug
519509  * prints a message with ACPI prefix and object path. This function
....@@ -612,6 +602,31 @@
612602 }
613603 
614604 /**
605
+ * acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence
606
+ * @handle: ACPI device handle
607
+ * @space_id: ACPI address space id to register OpRegion presence for
608
+ * @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or
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+ *            ACPI_REG_DISCONNECT
610
+ *
611
+ * Evaluate device's _REG method to register OpRegion presence.
612
+ */
613
+acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function)
614
+{
615
+	struct acpi_object_list arg_list;
616
+	union acpi_object params[2];
617
+
618
+	params[0].type = ACPI_TYPE_INTEGER;
619
+	params[0].integer.value = space_id;
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+	params[1].type = ACPI_TYPE_INTEGER;
621
+	params[1].integer.value = function;
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+	arg_list.count = 2;
623
+	arg_list.pointer = params;
624
+
625
+	return acpi_evaluate_object(handle, "_REG", &arg_list, NULL);
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+}
627
+EXPORT_SYMBOL(acpi_evaluate_reg);
628
+
629
+/**
615630  * acpi_evaluate_dsm - evaluate device's _DSM method
616631  * @handle: ACPI device handle
617632  * @guid: GUID of requested functions, should be 16 bytes
....@@ -708,6 +723,31 @@
708723 EXPORT_SYMBOL(acpi_check_dsm);
709724 
710725 /**
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+ * acpi_dev_hid_uid_match - Match device by supplied HID and UID
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+ * @adev: ACPI device to match.
728
+ * @hid2: Hardware ID of the device.
729
+ * @uid2: Unique ID of the device, pass NULL to not check _UID.
730
+ *
731
+ * Matches HID and UID in @adev with given @hid2 and @uid2.
732
+ * Returns true if matches.
733
+ */
734
+bool acpi_dev_hid_uid_match(struct acpi_device *adev,
735
+			    const char *hid2, const char *uid2)
736
+{
737
+	const char *hid1 = acpi_device_hid(adev);
738
+	const char *uid1 = acpi_device_uid(adev);
739
+
740
+	if (strcmp(hid1, hid2))
741
+		return false;
742
+
743
+	if (!uid2)
744
+		return true;
745
+
746
+	return uid1 && !strcmp(uid1, uid2);
747
+}
748
+EXPORT_SYMBOL(acpi_dev_hid_uid_match);
749
+
750
+/**
711751  * acpi_dev_found - Detect presence of a given ACPI device in the namespace.
712752  * @hid: Hardware ID of the device.
713753  *
....@@ -738,16 +778,15 @@
738778 EXPORT_SYMBOL(acpi_dev_found);
739779 
740780 struct acpi_dev_match_info {
741
-	const char *dev_name;
742781 	struct acpi_device_id hid[2];
743782 	const char *uid;
744783 	s64 hrv;
745784 };
746785 
747
-static int acpi_dev_match_cb(struct device *dev, void *data)
786
+static int acpi_dev_match_cb(struct device *dev, const void *data)
748787 {
749788 	struct acpi_device *adev = to_acpi_device(dev);
750
-	struct acpi_dev_match_info *match = data;
789
+	const struct acpi_dev_match_info *match = data;
751790 	unsigned long long hrv;
752791 	acpi_status status;
753792 
....@@ -757,8 +796,6 @@
757796 	if (match->uid && (!adev->pnp.unique_id ||
758797 	    strcmp(adev->pnp.unique_id, match->uid)))
759798 		return 0;
760
-
761
-	match->dev_name = acpi_dev_name(adev);
762799 
763800 	if (match->hrv == -1)
764801 		return 1;
....@@ -806,18 +843,20 @@
806843 EXPORT_SYMBOL(acpi_dev_present);
807844 
808845 /**
809
- * acpi_dev_get_first_match_name - Return name of first match of ACPI device
846
+ * acpi_dev_get_first_match_dev - Return the first match of ACPI device
810847  * @hid: Hardware ID of the device.
811848  * @uid: Unique ID of the device, pass NULL to not check _UID
812849  * @hrv: Hardware Revision of the device, pass -1 to not check _HRV
813850  *
814
- * Return device name if a matching device was present
851
+ * Return the first match of ACPI device if a matching device was present
815852  * at the moment of invocation, or NULL otherwise.
853
+ *
854
+ * The caller is responsible to call put_device() on the returned device.
816855  *
817856  * See additional information in acpi_dev_present() as well.
818857  */
819
-const char *
820
-acpi_dev_get_first_match_name(const char *hid, const char *uid, s64 hrv)
858
+struct acpi_device *
859
+acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
821860 {
822861 	struct acpi_dev_match_info match = {};
823862 	struct device *dev;
....@@ -827,9 +866,9 @@
827866 	match.hrv = hrv;
828867 
829868 	dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
830
-	return dev ? match.dev_name : NULL;
869
+	return dev ? to_acpi_device(dev) : NULL;
831870 }
832
-EXPORT_SYMBOL(acpi_dev_get_first_match_name);
871
+EXPORT_SYMBOL(acpi_dev_get_first_match_dev);
833872 
834873 /*
835874  * acpi_backlight= handling, this is done here rather then in video_detect.c