96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
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/*
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* PowerNV sensor code
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*
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* Copyright (C) 2013 IBM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/of_platform.h>
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#include <asm/opal.h>
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#include <asm/machdep.h>
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static DEFINE_MUTEX(opal_sensor_mutex);
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/*
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* This will return sensor information to driver based on the requested sensor
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* handle. A handle is an opaque id for the powernv, read by the driver from the
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* device tree..
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*/
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int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
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{
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int ret, token;
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struct opal_msg msg;
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__be32 data;
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token = opal_async_get_token_interruptible();
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if (token < 0) {
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pr_err("%s: Couldn't get the token, returning\n", __func__);
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ret = token;
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goto out;
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}
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mutex_lock(&opal_sensor_mutex);
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ret = opal_sensor_read(sensor_hndl, token, &data);
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switch (ret) {
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case OPAL_ASYNC_COMPLETION:
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ret = opal_async_wait_response(token, &msg);
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if (ret) {
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pr_err("%s: Failed to wait for the async response, %d\n",
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__func__, ret);
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goto out_token;
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}
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ret = opal_error_code(opal_get_async_rc(msg));
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*sensor_data = be32_to_cpu(data);
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break;
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case OPAL_SUCCESS:
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ret = 0;
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*sensor_data = be32_to_cpu(data);
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break;
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default:
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ret = opal_error_code(ret);
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break;
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}
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out_token:
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mutex_unlock(&opal_sensor_mutex);
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opal_async_release_token(token);
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(opal_get_sensor_data);
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int __init opal_sensor_init(void)
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{
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struct platform_device *pdev;
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struct device_node *sensor;
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sensor = of_find_node_by_path("/ibm,opal/sensors");
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if (!sensor) {
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pr_err("Opal node 'sensors' not found\n");
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return -ENODEV;
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}
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pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
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of_node_put(sensor);
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return PTR_ERR_OR_ZERO(pdev);
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}
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