1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PowerNV sensor code
4 *
5 * Copyright (C) 2013 IBM
6 */
7
8#include <linux/delay.h>
9#include <linux/of.h>
10#include <linux/of_platform.h>
11#include <linux/platform_device.h>
12#include <asm/opal.h>
13#include <asm/machdep.h>
14
15/*
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
18 * device tree..
19 */
20int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
21{
22	int ret, token;
23	struct opal_msg msg;
24	__be32 data;
25
26	token = opal_async_get_token_interruptible();
27	if (token < 0)
28		return token;
29
30	ret = opal_sensor_read(sensor_hndl, token, &data);
31	switch (ret) {
32	case OPAL_ASYNC_COMPLETION:
33		ret = opal_async_wait_response(token, &msg);
34		if (ret) {
35			pr_err("%s: Failed to wait for the async response, %d\n",
36			       __func__, ret);
37			goto out;
38		}
39
40		ret = opal_error_code(opal_get_async_rc(msg));
41		*sensor_data = be32_to_cpu(data);
42		break;
43
44	case OPAL_SUCCESS:
45		ret = 0;
46		*sensor_data = be32_to_cpu(data);
47		break;
48
49	case OPAL_WRONG_STATE:
50		ret = -EIO;
51		break;
52
53	default:
54		ret = opal_error_code(ret);
55		break;
56	}
57
58out:
59	opal_async_release_token(token);
60	return ret;
61}
62EXPORT_SYMBOL_GPL(opal_get_sensor_data);
63
64int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
65{
66	int ret, token;
67	struct opal_msg msg;
68	__be64 data;
69
70	if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
71		u32 sdata;
72
73		ret = opal_get_sensor_data(sensor_hndl, &sdata);
74		if (!ret)
75			*sensor_data = sdata;
76		return ret;
77	}
78
79	token = opal_async_get_token_interruptible();
80	if (token < 0)
81		return token;
82
83	ret = opal_sensor_read_u64(sensor_hndl, token, &data);
84	switch (ret) {
85	case OPAL_ASYNC_COMPLETION:
86		ret = opal_async_wait_response(token, &msg);
87		if (ret) {
88			pr_err("%s: Failed to wait for the async response, %d\n",
89			       __func__, ret);
90			goto out_token;
91		}
92
93		ret = opal_error_code(opal_get_async_rc(msg));
94		*sensor_data = be64_to_cpu(data);
95		break;
96
97	case OPAL_SUCCESS:
98		ret = 0;
99		*sensor_data = be64_to_cpu(data);
100		break;
101
102	case OPAL_WRONG_STATE:
103		ret = -EIO;
104		break;
105
106	default:
107		ret = opal_error_code(ret);
108		break;
109	}
110
111out_token:
112	opal_async_release_token(token);
113	return ret;
114}
115EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
116
117int __init opal_sensor_init(void)
118{
119	struct platform_device *pdev;
120	struct device_node *sensor;
121
122	sensor = of_find_node_by_path("/ibm,opal/sensors");
123	if (!sensor) {
124		pr_err("Opal node 'sensors' not found\n");
125		return -ENODEV;
126	}
127
128	pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
129	of_node_put(sensor);
130
131	return PTR_ERR_OR_ZERO(pdev);
132}
133