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96e023e753
Most of the OPAL subsystems are always compiled in for PowerNV and many of them need to be initialised before or after other OPAL subsystems. Rather than trying to control this ordering through machine initcalls it is clearer and easier to control initialisation order with explicit calls in opal_init. Signed-off-by: Alistair Popple <alistair@popple.id.au> Cc: Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
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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(be64_to_cpu(msg.params[1]));
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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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