1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Management Interface(SCMI) based hwmon sensor driver
*
* Copyright (C) 2018 ARM Ltd.
* Sudeep Holla <sudeep.holla@arm.com>
*/
#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/scmi_protocol.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
struct scmi_sensors {
const struct scmi_handle *handle;
const struct scmi_sensor_info **info[hwmon_max];
};
static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
int ret;
u64 value;
const struct scmi_sensor_info *sensor;
struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
const struct scmi_handle *h = scmi_sensors->handle;
sensor = *(scmi_sensors->info[type] + channel);
ret = h->sensor_ops->reading_get(h, sensor->id, false, &value);
if (!ret)
*val = value;
return ret;
}
static int
scmi_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
const struct scmi_sensor_info *sensor;
struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
sensor = *(scmi_sensors->info[type] + channel);
*str = sensor->name;
return 0;
}
static umode_t
scmi_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct scmi_sensor_info *sensor;
const struct scmi_sensors *scmi_sensors = drvdata;
sensor = *(scmi_sensors->info[type] + channel);
if (sensor && sensor->name)
return S_IRUGO;
return 0;
}
static const struct hwmon_ops scmi_hwmon_ops = {
.is_visible = scmi_hwmon_is_visible,
.read = scmi_hwmon_read,
.read_string = scmi_hwmon_read_string,
};
static struct hwmon_chip_info scmi_chip_info = {
.ops = &scmi_hwmon_ops,
.info = NULL,
};
static int scmi_hwmon_add_chan_info(struct hwmon_channel_info *scmi_hwmon_chan,
struct device *dev, int num,
enum hwmon_sensor_types type, u32 config)
{
int i;
u32 *cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return -ENOMEM;
scmi_hwmon_chan->type = type;
scmi_hwmon_chan->config = cfg;
for (i = 0; i < num; i++, cfg++)
*cfg = config;
return 0;
}
static enum hwmon_sensor_types scmi_types[] = {
[TEMPERATURE_C] = hwmon_temp,
[VOLTAGE] = hwmon_in,
[CURRENT] = hwmon_curr,
[POWER] = hwmon_power,
[ENERGY] = hwmon_energy,
};
static u32 hwmon_attributes[hwmon_max] = {
[hwmon_chip] = HWMON_C_REGISTER_TZ,
[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
[hwmon_power] = HWMON_P_INPUT | HWMON_P_LABEL,
[hwmon_energy] = HWMON_E_INPUT | HWMON_E_LABEL,
};
static int scmi_hwmon_probe(struct scmi_device *sdev)
{
int i, idx;
u16 nr_sensors;
enum hwmon_sensor_types type;
struct scmi_sensors *scmi_sensors;
const struct scmi_sensor_info *sensor;
int nr_count[hwmon_max] = {0}, nr_types = 0;
const struct hwmon_chip_info *chip_info;
struct device *hwdev, *dev = &sdev->dev;
struct hwmon_channel_info *scmi_hwmon_chan;
const struct hwmon_channel_info **ptr_scmi_ci;
const struct scmi_handle *handle = sdev->handle;
if (!handle || !handle->sensor_ops)
return -ENODEV;
nr_sensors = handle->sensor_ops->count_get(handle);
if (!nr_sensors)
return -EIO;
scmi_sensors = devm_kzalloc(dev, sizeof(*scmi_sensors), GFP_KERNEL);
if (!scmi_sensors)
return -ENOMEM;
scmi_sensors->handle = handle;
for (i = 0; i < nr_sensors; i++) {
sensor = handle->sensor_ops->info_get(handle, i);
if (!sensor)
return -EINVAL;
switch (sensor->type) {
case TEMPERATURE_C:
case VOLTAGE:
case CURRENT:
case POWER:
case ENERGY:
type = scmi_types[sensor->type];
if (!nr_count[type])
nr_types++;
nr_count[type]++;
break;
}
}
if (nr_count[hwmon_temp])
nr_count[hwmon_chip]++, nr_types++;
scmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*scmi_hwmon_chan),
GFP_KERNEL);
if (!scmi_hwmon_chan)
return -ENOMEM;
ptr_scmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*ptr_scmi_ci),
GFP_KERNEL);
if (!ptr_scmi_ci)
return -ENOMEM;
scmi_chip_info.info = ptr_scmi_ci;
chip_info = &scmi_chip_info;
for (type = 0; type < hwmon_max; type++) {
if (!nr_count[type])
continue;
scmi_hwmon_add_chan_info(scmi_hwmon_chan, dev, nr_count[type],
type, hwmon_attributes[type]);
*ptr_scmi_ci++ = scmi_hwmon_chan++;
scmi_sensors->info[type] =
devm_kcalloc(dev, nr_count[type],
sizeof(*scmi_sensors->info), GFP_KERNEL);
if (!scmi_sensors->info[type])
return -ENOMEM;
}
for (i = nr_sensors - 1; i >= 0 ; i--) {
sensor = handle->sensor_ops->info_get(handle, i);
if (!sensor)
continue;
switch (sensor->type) {
case TEMPERATURE_C:
case VOLTAGE:
case CURRENT:
case POWER:
case ENERGY:
type = scmi_types[sensor->type];
idx = --nr_count[type];
*(scmi_sensors->info[type] + idx) = sensor;
break;
}
}
hwdev = devm_hwmon_device_register_with_info(dev, "scmi_sensors",
scmi_sensors, chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwdev);
}
static const struct scmi_device_id scmi_id_table[] = {
{ SCMI_PROTOCOL_SENSOR },
{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
static struct scmi_driver scmi_hwmon_drv = {
.name = "scmi-hwmon",
.probe = scmi_hwmon_probe,
.id_table = scmi_id_table,
};
module_scmi_driver(scmi_hwmon_drv);
MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("ARM SCMI HWMON interface driver");
MODULE_LICENSE("GPL v2");
|
