1 /*
2 * PowerNV sensor code
3 *
4 * Copyright (C) 2013 IBM
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/delay.h>
22 #include <linux/of_platform.h>
23 #include <asm/opal.h>
24 #include <asm/machdep.h>
25
26 /*
27 * This will return sensor information to driver based on the requested sensor
28 * handle. A handle is an opaque id for the powernv, read by the driver from the
29 * device tree..
30 */
opal_get_sensor_data(u32 sensor_hndl,u32 * sensor_data)31 int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
32 {
33 int ret, token;
34 struct opal_msg msg;
35 __be32 data;
36
37 token = opal_async_get_token_interruptible();
38 if (token < 0)
39 return token;
40
41 ret = opal_sensor_read(sensor_hndl, token, &data);
42 switch (ret) {
43 case OPAL_ASYNC_COMPLETION:
44 ret = opal_async_wait_response(token, &msg);
45 if (ret) {
46 pr_err("%s: Failed to wait for the async response, %d\n",
47 __func__, ret);
48 goto out;
49 }
50
51 ret = opal_error_code(opal_get_async_rc(msg));
52 *sensor_data = be32_to_cpu(data);
53 break;
54
55 case OPAL_SUCCESS:
56 ret = 0;
57 *sensor_data = be32_to_cpu(data);
58 break;
59
60 case OPAL_WRONG_STATE:
61 ret = -EIO;
62 break;
63
64 default:
65 ret = opal_error_code(ret);
66 break;
67 }
68
69 out:
70 opal_async_release_token(token);
71 return ret;
72 }
73 EXPORT_SYMBOL_GPL(opal_get_sensor_data);
74
opal_get_sensor_data_u64(u32 sensor_hndl,u64 * sensor_data)75 int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
76 {
77 int ret, token;
78 struct opal_msg msg;
79 __be64 data;
80
81 if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
82 u32 sdata;
83
84 ret = opal_get_sensor_data(sensor_hndl, &sdata);
85 if (!ret)
86 *sensor_data = sdata;
87 return ret;
88 }
89
90 token = opal_async_get_token_interruptible();
91 if (token < 0)
92 return token;
93
94 ret = opal_sensor_read_u64(sensor_hndl, token, &data);
95 switch (ret) {
96 case OPAL_ASYNC_COMPLETION:
97 ret = opal_async_wait_response(token, &msg);
98 if (ret) {
99 pr_err("%s: Failed to wait for the async response, %d\n",
100 __func__, ret);
101 goto out_token;
102 }
103
104 ret = opal_error_code(opal_get_async_rc(msg));
105 *sensor_data = be64_to_cpu(data);
106 break;
107
108 case OPAL_SUCCESS:
109 ret = 0;
110 *sensor_data = be64_to_cpu(data);
111 break;
112
113 case OPAL_WRONG_STATE:
114 ret = -EIO;
115 break;
116
117 default:
118 ret = opal_error_code(ret);
119 break;
120 }
121
122 out_token:
123 opal_async_release_token(token);
124 return ret;
125 }
126 EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
127
opal_sensor_init(void)128 int __init opal_sensor_init(void)
129 {
130 struct platform_device *pdev;
131 struct device_node *sensor;
132
133 sensor = of_find_node_by_path("/ibm,opal/sensors");
134 if (!sensor) {
135 pr_err("Opal node 'sensors' not found\n");
136 return -ENODEV;
137 }
138
139 pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
140 of_node_put(sensor);
141
142 return PTR_ERR_OR_ZERO(pdev);
143 }
144
