1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (C) 2013 IBM
8 #include <linux/delay.h>
10 #include <linux/of_platform.h>
11 #include <linux/platform_device.h>
13 #include <asm/machdep.h>
16 * This will return sensor information to driver based on the requested sensor
17 * handle. A handle is an opaque id for the powernv, read by the driver from the
20 int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
26 token = opal_async_get_token_interruptible();
30 ret = opal_sensor_read(sensor_hndl, token, &data);
32 case OPAL_ASYNC_COMPLETION:
33 ret = opal_async_wait_response(token, &msg);
35 pr_err("%s: Failed to wait for the async response, %d\n",
40 ret = opal_error_code(opal_get_async_rc(msg));
41 *sensor_data = be32_to_cpu(data);
46 *sensor_data = be32_to_cpu(data);
49 case OPAL_WRONG_STATE:
54 ret = opal_error_code(ret);
59 opal_async_release_token(token);
62 EXPORT_SYMBOL_GPL(opal_get_sensor_data);
64 int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
70 if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
73 ret = opal_get_sensor_data(sensor_hndl, &sdata);
79 token = opal_async_get_token_interruptible();
83 ret = opal_sensor_read_u64(sensor_hndl, token, &data);
85 case OPAL_ASYNC_COMPLETION:
86 ret = opal_async_wait_response(token, &msg);
88 pr_err("%s: Failed to wait for the async response, %d\n",
93 ret = opal_error_code(opal_get_async_rc(msg));
94 *sensor_data = be64_to_cpu(data);
99 *sensor_data = be64_to_cpu(data);
102 case OPAL_WRONG_STATE:
107 ret = opal_error_code(ret);
112 opal_async_release_token(token);
115 EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
117 int __init opal_sensor_init(void)
119 struct platform_device *pdev;
120 struct device_node *sensor;
122 sensor = of_find_node_by_path("/ibm,opal/sensors");
124 pr_err("Opal node 'sensors' not found\n");
128 pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
131 return PTR_ERR_OR_ZERO(pdev);