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/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2017 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License 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.
*
* The full GNU General Public License is included in this distribution
* in the file called COPYING.
*
* Contact Information:
* Intel Linux Wireless <linuxwifi@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2017 Intel Deutschland GmbH
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include "iwl-drv.h"
#include "iwl-debug.h"
#include "acpi.h"
void *iwl_acpi_get_object(struct device *dev, acpi_string method)
{
acpi_handle root_handle;
acpi_handle handle;
struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
acpi_status status;
root_handle = ACPI_HANDLE(dev);
if (!root_handle) {
IWL_DEBUG_DEV_RADIO(dev,
"Could not retrieve root port ACPI handle\n");
return ERR_PTR(-ENOENT);
}
/* Get the method's handle */
status = acpi_get_handle(root_handle, method, &handle);
if (ACPI_FAILURE(status)) {
IWL_DEBUG_DEV_RADIO(dev, "%s method not found\n", method);
return ERR_PTR(-ENOENT);
}
/* Call the method with no arguments */
status = acpi_evaluate_object(handle, NULL, NULL, &buf);
if (ACPI_FAILURE(status)) {
IWL_DEBUG_DEV_RADIO(dev, "%s invocation failed (0x%x)\n",
method, status);
return ERR_PTR(-ENOENT);
}
return buf.pointer;
}
IWL_EXPORT_SYMBOL(iwl_acpi_get_object);
union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev,
union acpi_object *data,
int data_size)
{
int i;
union acpi_object *wifi_pkg;
/*
* We need at least one entry in the wifi package that
* describes the domain, and one more entry, otherwise there's
* no point in reading it.
*/
if (WARN_ON_ONCE(data_size < 2))
return ERR_PTR(-EINVAL);
/*
* We need at least two packages, one for the revision and one
* for the data itself. Also check that the revision is valid
* (i.e. it is an integer set to 0).
*/
if (data->type != ACPI_TYPE_PACKAGE ||
data->package.count < 2 ||
data->package.elements[0].type != ACPI_TYPE_INTEGER ||
data->package.elements[0].integer.value != 0) {
IWL_DEBUG_DEV_RADIO(dev, "Unsupported packages structure\n");
return ERR_PTR(-EINVAL);
}
/* loop through all the packages to find the one for WiFi */
for (i = 1; i < data->package.count; i++) {
union acpi_object *domain;
wifi_pkg = &data->package.elements[i];
/* skip entries that are not a package with the right size */
if (wifi_pkg->type != ACPI_TYPE_PACKAGE ||
wifi_pkg->package.count != data_size)
continue;
domain = &wifi_pkg->package.elements[0];
if (domain->type == ACPI_TYPE_INTEGER &&
domain->integer.value == ACPI_WIFI_DOMAIN)
goto found;
}
return ERR_PTR(-ENOENT);
found:
return wifi_pkg;
}
IWL_EXPORT_SYMBOL(iwl_acpi_get_wifi_pkg);
int iwl_acpi_get_mcc(struct device *dev, char *mcc)
{
union acpi_object *wifi_pkg, *data;
u32 mcc_val;
int ret;
data = iwl_acpi_get_object(dev, ACPI_WRDD_METHOD);
if (IS_ERR(data))
return PTR_ERR(data);
wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data, ACPI_WRDD_WIFI_DATA_SIZE);
if (IS_ERR(wifi_pkg)) {
ret = PTR_ERR(wifi_pkg);
goto out_free;
}
if (wifi_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) {
ret = -EINVAL;
goto out_free;
}
mcc_val = wifi_pkg->package.elements[1].integer.value;
mcc[0] = (mcc_val >> 8) & 0xff;
mcc[1] = mcc_val & 0xff;
mcc[2] = '\0';
ret = 0;
out_free:
kfree(data);
return ret;
}
IWL_EXPORT_SYMBOL(iwl_acpi_get_mcc);
u64 iwl_acpi_get_pwr_limit(struct device *dev)
{
union acpi_object *data, *wifi_pkg;
u64 dflt_pwr_limit;
data = iwl_acpi_get_object(dev, ACPI_SPLC_METHOD);
if (IS_ERR(data)) {
dflt_pwr_limit = 0;
goto out;
}
wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data,
ACPI_SPLC_WIFI_DATA_SIZE);
if (IS_ERR(wifi_pkg) ||
wifi_pkg->package.elements[1].integer.value != ACPI_TYPE_INTEGER) {
dflt_pwr_limit = 0;
goto out_free;
}
dflt_pwr_limit = wifi_pkg->package.elements[1].integer.value;
out_free:
kfree(data);
out:
return dflt_pwr_limit;
}
IWL_EXPORT_SYMBOL(iwl_acpi_get_pwr_limit);
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