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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PowerNV sensor code
*
* Copyright (C) 2013 IBM
*/
#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 opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
{
int ret, token;
struct opal_msg msg;
__be64 data;
if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
u32 sdata;
ret = opal_get_sensor_data(sensor_hndl, &sdata);
if (!ret)
*sensor_data = sdata;
return ret;
}
token = opal_async_get_token_interruptible();
if (token < 0)
return token;
ret = opal_sensor_read_u64(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_token;
}
ret = opal_error_code(opal_get_async_rc(msg));
*sensor_data = be64_to_cpu(data);
break;
case OPAL_SUCCESS:
ret = 0;
*sensor_data = be64_to_cpu(data);
break;
case OPAL_WRONG_STATE:
ret = -EIO;
break;
default:
ret = opal_error_code(ret);
break;
}
out_token:
opal_async_release_token(token);
return ret;
}
EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
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);
}
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