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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ChromeOS EC driver for hwmon
*
* Copyright (C) 2024 Thomas Weißschuh <linux@weissschuh.net>
*/
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/types.h>
#include <linux/units.h>
#define DRV_NAME "cros-ec-hwmon"
struct cros_ec_hwmon_priv {
struct cros_ec_device *cros_ec;
const char *temp_sensor_names[EC_TEMP_SENSOR_ENTRIES + EC_TEMP_SENSOR_B_ENTRIES];
u8 usable_fans;
};
static int cros_ec_hwmon_read_fan_speed(struct cros_ec_device *cros_ec, u8 index, u16 *speed)
{
int ret;
__le16 __speed;
ret = cros_ec_cmd_readmem(cros_ec, EC_MEMMAP_FAN + index * 2, 2, &__speed);
if (ret < 0)
return ret;
*speed = le16_to_cpu(__speed);
return 0;
}
static int cros_ec_hwmon_read_temp(struct cros_ec_device *cros_ec, u8 index, u8 *temp)
{
unsigned int offset;
int ret;
if (index < EC_TEMP_SENSOR_ENTRIES)
offset = EC_MEMMAP_TEMP_SENSOR + index;
else
offset = EC_MEMMAP_TEMP_SENSOR_B + index - EC_TEMP_SENSOR_ENTRIES;
ret = cros_ec_cmd_readmem(cros_ec, offset, 1, temp);
if (ret < 0)
return ret;
return 0;
}
static bool cros_ec_hwmon_is_error_fan(u16 speed)
{
return speed == EC_FAN_SPEED_NOT_PRESENT || speed == EC_FAN_SPEED_STALLED;
}
static bool cros_ec_hwmon_is_error_temp(u8 temp)
{
return temp == EC_TEMP_SENSOR_NOT_PRESENT ||
temp == EC_TEMP_SENSOR_ERROR ||
temp == EC_TEMP_SENSOR_NOT_POWERED ||
temp == EC_TEMP_SENSOR_NOT_CALIBRATED;
}
static long cros_ec_hwmon_temp_to_millicelsius(u8 temp)
{
return kelvin_to_millicelsius((((long)temp) + EC_TEMP_SENSOR_OFFSET));
}
static int cros_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct cros_ec_hwmon_priv *priv = dev_get_drvdata(dev);
int ret = -EOPNOTSUPP;
u16 speed;
u8 temp;
if (type == hwmon_fan) {
if (attr == hwmon_fan_input) {
ret = cros_ec_hwmon_read_fan_speed(priv->cros_ec, channel, &speed);
if (ret == 0) {
if (cros_ec_hwmon_is_error_fan(speed))
ret = -ENODATA;
else
*val = speed;
}
} else if (attr == hwmon_fan_fault) {
ret = cros_ec_hwmon_read_fan_speed(priv->cros_ec, channel, &speed);
if (ret == 0)
*val = cros_ec_hwmon_is_error_fan(speed);
}
} else if (type == hwmon_temp) {
if (attr == hwmon_temp_input) {
ret = cros_ec_hwmon_read_temp(priv->cros_ec, channel, &temp);
if (ret == 0) {
if (cros_ec_hwmon_is_error_temp(temp))
ret = -ENODATA;
else
*val = cros_ec_hwmon_temp_to_millicelsius(temp);
}
} else if (attr == hwmon_temp_fault) {
ret = cros_ec_hwmon_read_temp(priv->cros_ec, channel, &temp);
if (ret == 0)
*val = cros_ec_hwmon_is_error_temp(temp);
}
}
return ret;
}
static int cros_ec_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
struct cros_ec_hwmon_priv *priv = dev_get_drvdata(dev);
if (type == hwmon_temp && attr == hwmon_temp_label) {
*str = priv->temp_sensor_names[channel];
return 0;
}
return -EOPNOTSUPP;
}
static umode_t cros_ec_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct cros_ec_hwmon_priv *priv = data;
if (type == hwmon_fan) {
if (priv->usable_fans & BIT(channel))
return 0444;
} else if (type == hwmon_temp) {
if (priv->temp_sensor_names[channel])
return 0444;
}
return 0;
}
static const struct hwmon_channel_info * const cros_ec_hwmon_info[] = {
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_FAULT,
HWMON_F_INPUT | HWMON_F_FAULT,
HWMON_F_INPUT | HWMON_F_FAULT,
HWMON_F_INPUT | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_LABEL),
NULL
};
static const struct hwmon_ops cros_ec_hwmon_ops = {
.read = cros_ec_hwmon_read,
.read_string = cros_ec_hwmon_read_string,
.is_visible = cros_ec_hwmon_is_visible,
};
static const struct hwmon_chip_info cros_ec_hwmon_chip_info = {
.ops = &cros_ec_hwmon_ops,
.info = cros_ec_hwmon_info,
};
static void cros_ec_hwmon_probe_temp_sensors(struct device *dev, struct cros_ec_hwmon_priv *priv,
u8 thermal_version)
{
struct ec_params_temp_sensor_get_info req = {};
struct ec_response_temp_sensor_get_info resp;
size_t candidates, i, sensor_name_size;
int ret;
u8 temp;
if (thermal_version < 2)
candidates = EC_TEMP_SENSOR_ENTRIES;
else
candidates = ARRAY_SIZE(priv->temp_sensor_names);
for (i = 0; i < candidates; i++) {
if (cros_ec_hwmon_read_temp(priv->cros_ec, i, &temp) < 0)
continue;
if (temp == EC_TEMP_SENSOR_NOT_PRESENT)
continue;
req.id = i;
ret = cros_ec_cmd(priv->cros_ec, 0, EC_CMD_TEMP_SENSOR_GET_INFO,
&req, sizeof(req), &resp, sizeof(resp));
if (ret < 0)
continue;
sensor_name_size = strnlen(resp.sensor_name, sizeof(resp.sensor_name));
priv->temp_sensor_names[i] = devm_kasprintf(dev, GFP_KERNEL, "%.*s",
(int)sensor_name_size,
resp.sensor_name);
}
}
static void cros_ec_hwmon_probe_fans(struct cros_ec_hwmon_priv *priv)
{
u16 speed;
size_t i;
int ret;
for (i = 0; i < EC_FAN_SPEED_ENTRIES; i++) {
ret = cros_ec_hwmon_read_fan_speed(priv->cros_ec, i, &speed);
if (ret == 0 && speed != EC_FAN_SPEED_NOT_PRESENT)
priv->usable_fans |= BIT(i);
}
}
static int cros_ec_hwmon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
struct cros_ec_device *cros_ec = ec_dev->ec_dev;
struct cros_ec_hwmon_priv *priv;
struct device *hwmon_dev;
u8 thermal_version;
int ret;
ret = cros_ec_cmd_readmem(cros_ec, EC_MEMMAP_THERMAL_VERSION, 1, &thermal_version);
if (ret < 0)
return ret;
/* Covers both fan and temp sensors */
if (thermal_version == 0)
return -ENODEV;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->cros_ec = cros_ec;
cros_ec_hwmon_probe_temp_sensors(dev, priv, thermal_version);
cros_ec_hwmon_probe_fans(priv);
hwmon_dev = devm_hwmon_device_register_with_info(dev, "cros_ec", priv,
&cros_ec_hwmon_chip_info, NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct platform_device_id cros_ec_hwmon_id[] = {
{ DRV_NAME, 0 },
{}
};
static struct platform_driver cros_ec_hwmon_driver = {
.driver.name = DRV_NAME,
.probe = cros_ec_hwmon_probe,
.id_table = cros_ec_hwmon_id,
};
module_platform_driver(cros_ec_hwmon_driver);
MODULE_DEVICE_TABLE(platform, cros_ec_hwmon_id);
MODULE_DESCRIPTION("ChromeOS EC Hardware Monitoring Driver");
MODULE_AUTHOR("Thomas Weißschuh <linux@weissschuh.net");
MODULE_LICENSE("GPL");
|
