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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | // SPDX-License-Identifier: GPL-2.0-only /* * apple.c - Apple ACPI quirks * Copyright (C) 2017 Lukas Wunner <lukas@wunner.de> */ #include <linux/acpi.h> #include <linux/bitmap.h> #include <linux/platform_data/x86/apple.h> #include <linux/uuid.h> #include "../internal.h" /* Apple _DSM device properties GUID */ static const guid_t apple_prp_guid = GUID_INIT(0xa0b5b7c6, 0x1318, 0x441c, 0xb0, 0xc9, 0xfe, 0x69, 0x5e, 0xaf, 0x94, 0x9b); /** * acpi_extract_apple_properties - retrieve and convert Apple _DSM properties * @adev: ACPI device for which to retrieve the properties * * Invoke Apple's custom _DSM once to check the protocol version and once more * to retrieve the properties. They are marshalled up in a single package as * alternating key/value elements, unlike _DSD which stores them as a package * of 2-element packages. Convert to _DSD format and make them available under * the primary fwnode. */ void acpi_extract_apple_properties(struct acpi_device *adev) { unsigned int i, j = 0, newsize = 0, numprops, numvalid; union acpi_object *props, *newprops; unsigned long *valid = NULL; void *free_space; if (!x86_apple_machine) return; props = acpi_evaluate_dsm_typed(adev->handle, &apple_prp_guid, 1, 0, NULL, ACPI_TYPE_BUFFER); if (!props) return; if (!props->buffer.length) goto out_free; if (props->buffer.pointer[0] != 3) { acpi_handle_info(adev->handle, FW_INFO "unsupported properties version %*ph\n", props->buffer.length, props->buffer.pointer); goto out_free; } ACPI_FREE(props); props = acpi_evaluate_dsm_typed(adev->handle, &apple_prp_guid, 1, 1, NULL, ACPI_TYPE_PACKAGE); if (!props) return; numprops = props->package.count / 2; if (!numprops) goto out_free; valid = bitmap_zalloc(numprops, GFP_KERNEL); if (!valid) goto out_free; /* newsize = key length + value length of each tuple */ for (i = 0; i < numprops; i++) { union acpi_object *key = &props->package.elements[i * 2]; union acpi_object *val = &props->package.elements[i * 2 + 1]; if ( key->type != ACPI_TYPE_STRING || (val->type != ACPI_TYPE_INTEGER && val->type != ACPI_TYPE_BUFFER && val->type != ACPI_TYPE_STRING)) continue; /* skip invalid properties */ __set_bit(i, valid); newsize += key->string.length + 1; if ( val->type == ACPI_TYPE_BUFFER) newsize += val->buffer.length; else if (val->type == ACPI_TYPE_STRING) newsize += val->string.length + 1; } numvalid = bitmap_weight(valid, numprops); if (numprops > numvalid) acpi_handle_info(adev->handle, FW_INFO "skipped %u properties: wrong type\n", numprops - numvalid); if (numvalid == 0) goto out_free; /* newsize += top-level package + 3 objects for each key/value tuple */ newsize += (1 + 3 * numvalid) * sizeof(union acpi_object); newprops = ACPI_ALLOCATE_ZEROED(newsize); if (!newprops) goto out_free; /* layout: top-level package | packages | key/value tuples | strings */ newprops->type = ACPI_TYPE_PACKAGE; newprops->package.count = numvalid; newprops->package.elements = &newprops[1]; free_space = &newprops[1 + 3 * numvalid]; for_each_set_bit(i, valid, numprops) { union acpi_object *key = &props->package.elements[i * 2]; union acpi_object *val = &props->package.elements[i * 2 + 1]; unsigned int k = 1 + numvalid + j * 2; /* index into newprops */ unsigned int v = k + 1; newprops[1 + j].type = ACPI_TYPE_PACKAGE; newprops[1 + j].package.count = 2; newprops[1 + j].package.elements = &newprops[k]; newprops[k].type = ACPI_TYPE_STRING; newprops[k].string.length = key->string.length; newprops[k].string.pointer = free_space; memcpy(free_space, key->string.pointer, key->string.length); free_space += key->string.length + 1; newprops[v].type = val->type; if (val->type == ACPI_TYPE_INTEGER) { newprops[v].integer.value = val->integer.value; } else if (val->type == ACPI_TYPE_STRING) { newprops[v].string.length = val->string.length; newprops[v].string.pointer = free_space; memcpy(free_space, val->string.pointer, val->string.length); free_space += val->string.length + 1; } else { newprops[v].buffer.length = val->buffer.length; newprops[v].buffer.pointer = free_space; memcpy(free_space, val->buffer.pointer, val->buffer.length); free_space += val->buffer.length; } j++; /* count valid properties */ } WARN_ON(free_space != (void *)newprops + newsize); adev->data.pointer = newprops; acpi_data_add_props(&adev->data, &apple_prp_guid, newprops); out_free: ACPI_FREE(props); bitmap_free(valid); } |