91 lines
2.2 KiB
C
91 lines
2.2 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/of_platform.h>
|
|
#include <asm/opal.h>
|
|
#include <asm/machdep.h>
|
|
|
|
/*
|
|
* 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)
|
|
return token;
|
|
|
|
ret = opal_sensor_read(sensor_hndl, token, &data);
|
|
switch (ret) {
|
|
case OPAL_ASYNC_COMPLETION:
|
|
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;
|
|
}
|
|
|
|
ret = opal_error_code(opal_get_async_rc(msg));
|
|
*sensor_data = be32_to_cpu(data);
|
|
break;
|
|
|
|
case OPAL_SUCCESS:
|
|
ret = 0;
|
|
*sensor_data = be32_to_cpu(data);
|
|
break;
|
|
|
|
case OPAL_WRONG_STATE:
|
|
ret = -EIO;
|
|
break;
|
|
|
|
default:
|
|
ret = opal_error_code(ret);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
opal_async_release_token(token);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(opal_get_sensor_data);
|
|
|
|
int __init opal_sensor_init(void)
|
|
{
|
|
struct platform_device *pdev;
|
|
struct device_node *sensor;
|
|
|
|
sensor = of_find_node_by_path("/ibm,opal/sensors");
|
|
if (!sensor) {
|
|
pr_err("Opal node 'sensors' not found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
|
|
of_node_put(sensor);
|
|
|
|
return PTR_ERR_OR_ZERO(pdev);
|
|
}
|