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_platform.h>
10 #include <asm/opal.h>
11 #include <asm/machdep.h>
12
13 /*
14 * This will return sensor information to driver based on the requested sensor
15 * handle. A handle is an opaque id for the powernv, read by the driver from the
16 * device tree..
17 */
opal_get_sensor_data(u32 sensor_hndl,u32 * sensor_data)18 int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
19 {
20 int ret, token;
21 struct opal_msg msg;
22 __be32 data;
23
24 token = opal_async_get_token_interruptible();
25 if (token < 0)
26 return token;
27
28 ret = opal_sensor_read(sensor_hndl, token, &data);
29 switch (ret) {
30 case OPAL_ASYNC_COMPLETION:
31 ret = opal_async_wait_response(token, &msg);
32 if (ret) {
33 pr_err("%s: Failed to wait for the async response, %d\n",
34 __func__, ret);
35 goto out;
36 }
37
38 ret = opal_error_code(opal_get_async_rc(msg));
39 *sensor_data = be32_to_cpu(data);
40 break;
41
42 case OPAL_SUCCESS:
43 ret = 0;
44 *sensor_data = be32_to_cpu(data);
45 break;
46
47 case OPAL_WRONG_STATE:
48 ret = -EIO;
49 break;
50
51 default:
52 ret = opal_error_code(ret);
53 break;
54 }
55
56 out:
57 opal_async_release_token(token);
58 return ret;
59 }
60 EXPORT_SYMBOL_GPL(opal_get_sensor_data);
61
opal_get_sensor_data_u64(u32 sensor_hndl,u64 * sensor_data)62 int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
63 {
64 int ret, token;
65 struct opal_msg msg;
66 __be64 data;
67
68 if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
69 u32 sdata;
70
71 ret = opal_get_sensor_data(sensor_hndl, &sdata);
72 if (!ret)
73 *sensor_data = sdata;
74 return ret;
75 }
76
77 token = opal_async_get_token_interruptible();
78 if (token < 0)
79 return token;
80
81 ret = opal_sensor_read_u64(sensor_hndl, token, &data);
82 switch (ret) {
83 case OPAL_ASYNC_COMPLETION:
84 ret = opal_async_wait_response(token, &msg);
85 if (ret) {
86 pr_err("%s: Failed to wait for the async response, %d\n",
87 __func__, ret);
88 goto out_token;
89 }
90
91 ret = opal_error_code(opal_get_async_rc(msg));
92 *sensor_data = be64_to_cpu(data);
93 break;
94
95 case OPAL_SUCCESS:
96 ret = 0;
97 *sensor_data = be64_to_cpu(data);
98 break;
99
100 case OPAL_WRONG_STATE:
101 ret = -EIO;
102 break;
103
104 default:
105 ret = opal_error_code(ret);
106 break;
107 }
108
109 out_token:
110 opal_async_release_token(token);
111 return ret;
112 }
113 EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
114
opal_sensor_init(void)115 int __init opal_sensor_init(void)
116 {
117 struct platform_device *pdev;
118 struct device_node *sensor;
119
120 sensor = of_find_node_by_path("/ibm,opal/sensors");
121 if (!sensor) {
122 pr_err("Opal node 'sensors' not found\n");
123 return -ENODEV;
124 }
125
126 pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
127 of_node_put(sensor);
128
129 return PTR_ERR_OR_ZERO(pdev);
130 }
131