67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
|
|
* PowerNV sensor code
|
|
*
|
|
* Copyright (C) 2013 IBM
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/mutex.h>
|
|
#include <asm/opal.h>
|
|
|
|
static DEFINE_MUTEX(opal_sensor_mutex);
|
|
|
|
/*
|
|
* This will return sensor information to driver based on the requested sensor
|
|
* handle. A handle is an opaque id for the powernv, read by the driver from the
|
|
* device tree..
|
|
*/
|
|
int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
|
|
{
|
|
int ret, token;
|
|
struct opal_msg msg;
|
|
__be32 data;
|
|
|
|
token = opal_async_get_token_interruptible();
|
|
if (token < 0) {
|
|
pr_err("%s: Couldn't get the token, returning\n", __func__);
|
|
ret = token;
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&opal_sensor_mutex);
|
|
ret = opal_sensor_read(sensor_hndl, token, &data);
|
|
if (ret != OPAL_ASYNC_COMPLETION)
|
|
goto out_token;
|
|
|
|
ret = opal_async_wait_response(token, &msg);
|
|
if (ret) {
|
|
pr_err("%s: Failed to wait for the async response, %d\n",
|
|
__func__, ret);
|
|
goto out_token;
|
|
}
|
|
|
|
*sensor_data = be32_to_cpu(data);
|
|
ret = be64_to_cpu(msg.params[1]);
|
|
|
|
out_token:
|
|
mutex_unlock(&opal_sensor_mutex);
|
|
opal_async_release_token(token);
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(opal_get_sensor_data);
|