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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| /* | ||
| * acpi_lpat.c - LPAT table processing functions | ||
| * | ||
| * Copyright (C) 2015 Intel Corporation. All rights reserved. | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License version | ||
| * 2 as published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| */ | ||
|
|
||
| #include <linux/module.h> | ||
| #include <linux/acpi.h> | ||
| #include <acpi/acpi_lpat.h> | ||
|
|
||
| /** | ||
| * acpi_lpat_raw_to_temp(): Return temperature from raw value through | ||
| * LPAT conversion table | ||
| * | ||
| * @lpat_table: the temperature_raw mapping table structure | ||
| * @raw: the raw value, used as a key to get the temerature from the | ||
| * above mapping table | ||
| * | ||
| * A positive converted temperarure value will be returned on success, | ||
| * a negative errno will be returned in error cases. | ||
| */ | ||
| int acpi_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table, | ||
| int raw) | ||
| { | ||
| int i, delta_temp, delta_raw, temp; | ||
| struct acpi_lpat *lpat = lpat_table->lpat; | ||
|
|
||
| for (i = 0; i < lpat_table->lpat_count - 1; i++) { | ||
| if ((raw >= lpat[i].raw && raw <= lpat[i+1].raw) || | ||
| (raw <= lpat[i].raw && raw >= lpat[i+1].raw)) | ||
| break; | ||
| } | ||
|
|
||
| if (i == lpat_table->lpat_count - 1) | ||
| return -ENOENT; | ||
|
|
||
| delta_temp = lpat[i+1].temp - lpat[i].temp; | ||
| delta_raw = lpat[i+1].raw - lpat[i].raw; | ||
| temp = lpat[i].temp + (raw - lpat[i].raw) * delta_temp / delta_raw; | ||
|
|
||
| return temp; | ||
| } | ||
| EXPORT_SYMBOL_GPL(acpi_lpat_raw_to_temp); | ||
|
|
||
| /** | ||
| * acpi_lpat_temp_to_raw(): Return raw value from temperature through | ||
| * LPAT conversion table | ||
| * | ||
| * @lpat: the temperature_raw mapping table | ||
| * @temp: the temperature, used as a key to get the raw value from the | ||
| * above mapping table | ||
| * | ||
| * A positive converted temperature value will be returned on success, | ||
| * a negative errno will be returned in error cases. | ||
| */ | ||
| int acpi_lpat_temp_to_raw(struct acpi_lpat_conversion_table *lpat_table, | ||
| int temp) | ||
| { | ||
| int i, delta_temp, delta_raw, raw; | ||
| struct acpi_lpat *lpat = lpat_table->lpat; | ||
|
|
||
| for (i = 0; i < lpat_table->lpat_count - 1; i++) { | ||
| if (temp >= lpat[i].temp && temp <= lpat[i+1].temp) | ||
| break; | ||
| } | ||
|
|
||
| if (i == lpat_table->lpat_count - 1) | ||
| return -ENOENT; | ||
|
|
||
| delta_temp = lpat[i+1].temp - lpat[i].temp; | ||
| delta_raw = lpat[i+1].raw - lpat[i].raw; | ||
| raw = lpat[i].raw + (temp - lpat[i].temp) * delta_raw / delta_temp; | ||
|
|
||
| return raw; | ||
| } | ||
| EXPORT_SYMBOL_GPL(acpi_lpat_temp_to_raw); | ||
|
|
||
| /** | ||
| * acpi_lpat_get_conversion_table(): Parse ACPI LPAT table if present. | ||
| * | ||
| * @handle: Handle to acpi device | ||
| * | ||
| * Parse LPAT table to a struct of type acpi_lpat_table. On success | ||
| * it returns a pointer to newly allocated table. This table must | ||
| * be freed by the caller when finished processing, using a call to | ||
| * acpi_lpat_free_conversion_table. | ||
| */ | ||
| struct acpi_lpat_conversion_table *acpi_lpat_get_conversion_table(acpi_handle | ||
| handle) | ||
| { | ||
| struct acpi_lpat_conversion_table *lpat_table = NULL; | ||
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | ||
| union acpi_object *obj_p, *obj_e; | ||
| int *lpat, i; | ||
| acpi_status status; | ||
|
|
||
| status = acpi_evaluate_object(handle, "LPAT", NULL, &buffer); | ||
| if (ACPI_FAILURE(status)) | ||
| return NULL; | ||
|
|
||
| obj_p = (union acpi_object *)buffer.pointer; | ||
| if (!obj_p || (obj_p->type != ACPI_TYPE_PACKAGE) || | ||
| (obj_p->package.count % 2) || (obj_p->package.count < 4)) | ||
| goto out; | ||
|
|
||
| lpat = kcalloc(obj_p->package.count, sizeof(int), GFP_KERNEL); | ||
| if (!lpat) | ||
| goto out; | ||
|
|
||
| for (i = 0; i < obj_p->package.count; i++) { | ||
| obj_e = &obj_p->package.elements[i]; | ||
| if (obj_e->type != ACPI_TYPE_INTEGER) { | ||
| kfree(lpat); | ||
| goto out; | ||
| } | ||
| lpat[i] = (s64)obj_e->integer.value; | ||
| } | ||
|
|
||
| lpat_table = kzalloc(sizeof(*lpat_table), GFP_KERNEL); | ||
| if (!lpat_table) { | ||
| kfree(lpat); | ||
| goto out; | ||
| } | ||
|
|
||
| lpat_table->lpat = (struct acpi_lpat *)lpat; | ||
| lpat_table->lpat_count = obj_p->package.count / 2; | ||
|
|
||
| out: | ||
| kfree(buffer.pointer); | ||
| return lpat_table; | ||
| } | ||
| EXPORT_SYMBOL_GPL(acpi_lpat_get_conversion_table); | ||
|
|
||
| /** | ||
| * acpi_lpat_free_conversion_table(): Free LPAT table. | ||
| * | ||
| * @lpat_table: the temperature_raw mapping table structure | ||
| * | ||
| * Frees the LPAT table previously allocated by a call to | ||
| * acpi_lpat_get_conversion_table. | ||
| */ | ||
| void acpi_lpat_free_conversion_table(struct acpi_lpat_conversion_table | ||
| *lpat_table) | ||
| { | ||
| if (lpat_table) { | ||
| kfree(lpat_table->lpat); | ||
| kfree(lpat_table); | ||
| } | ||
| } | ||
| EXPORT_SYMBOL_GPL(acpi_lpat_free_conversion_table); | ||
|
|
||
| MODULE_LICENSE("GPL"); |
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