8de303bae4
The current driver probe() function assumes the sensor device to be always present and gets executed every time if the driver is loaded, but the appropriate hardware could not be present. So, move the platform device creation as part of platform init code and use the 'id_table' to check if the device is present or not. Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
86 lines
2.3 KiB
C
86 lines
2.3 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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if (ret != OPAL_ASYNC_COMPLETION)
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goto out_token;
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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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*sensor_data = be32_to_cpu(data);
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ret = be64_to_cpu(msg.params[1]);
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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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static __init int 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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machine_subsys_initcall(powernv, opal_sensor_init);
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