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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/…
…rzhang/linux Pull thermal managament updates from Zhang Rui: "Specifics: - Abstract the code and introduce helper functions for all int340x thermal drivers. From: Srinivas Pandruvada. - Reorganize the ACPI LPAT table support code so that it can be shared for both ACPI PMIC driver and int340x thermal driver. - Add support for Braswell in intel_soc_dts thermal driver. - a couple of small fixes/cleanups for step_wise governor and int340x thermal driver" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: Thermal/int340x_thermal: remove unused uuids. thermal: step_wise: spelling fixes thermal: int340x: fix sparse warning Thermal/int340x: LPAT conversion for temperature ACPI / PMIC: Use common LPAT table handling functions ACPI / LPAT: Common table processing functions thermal: Intel SoC DTS: Add Braswell support Thermal/int340x/int3402: Provide notification support Thermal/int340x/processor_thermal: Add thermal zone support Thermal/int340x/int3403: Use int340x thermal API Thermal/int340x/int3402: Use int340x thermal API Thermal/int340x: Add common thermal zone handler
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/* | ||
* 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. | ||
*/ | ||
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||
#include <linux/module.h> | ||
#include <linux/acpi.h> | ||
#include <acpi/acpi_lpat.h> | ||
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/** | ||
* 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; | ||
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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; | ||
} | ||
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if (i == lpat_table->lpat_count - 1) | ||
return -ENOENT; | ||
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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; | ||
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return temp; | ||
} | ||
EXPORT_SYMBOL_GPL(acpi_lpat_raw_to_temp); | ||
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/** | ||
* 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; | ||
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for (i = 0; i < lpat_table->lpat_count - 1; i++) { | ||
if (temp >= lpat[i].temp && temp <= lpat[i+1].temp) | ||
break; | ||
} | ||
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if (i == lpat_table->lpat_count - 1) | ||
return -ENOENT; | ||
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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; | ||
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return raw; | ||
} | ||
EXPORT_SYMBOL_GPL(acpi_lpat_temp_to_raw); | ||
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/** | ||
* 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; | ||
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status = acpi_evaluate_object(handle, "LPAT", NULL, &buffer); | ||
if (ACPI_FAILURE(status)) | ||
return NULL; | ||
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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; | ||
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lpat = kcalloc(obj_p->package.count, sizeof(int), GFP_KERNEL); | ||
if (!lpat) | ||
goto out; | ||
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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; | ||
} | ||
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lpat_table = kzalloc(sizeof(*lpat_table), GFP_KERNEL); | ||
if (!lpat_table) { | ||
kfree(lpat); | ||
goto out; | ||
} | ||
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lpat_table->lpat = (struct acpi_lpat *)lpat; | ||
lpat_table->lpat_count = obj_p->package.count / 2; | ||
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out: | ||
kfree(buffer.pointer); | ||
return lpat_table; | ||
} | ||
EXPORT_SYMBOL_GPL(acpi_lpat_get_conversion_table); | ||
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/** | ||
* 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); | ||
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MODULE_LICENSE("GPL"); |
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