Merge tag 'm68k-for-v5.3-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert...
[linux-2.6-microblaze.git] / arch / powerpc / platforms / powernv / opal-sensor.c
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  */
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
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
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 }