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
|
// SPDX-License-Identifier: GPL-2.0
/*
* UFS hardware monitoring support
* Copyright (c) 2021, Western Digital Corporation
*/
#include <linux/hwmon.h>
#include <linux/units.h>
#include <ufs/ufshcd.h>
#include "ufshcd-priv.h"
struct ufs_hwmon_data {
struct ufs_hba *hba;
u8 mask;
};
static int ufs_read_temp_enable(struct ufs_hba *hba, u8 mask, long *val)
{
u32 ee_mask;
int err;
err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
&ee_mask);
if (err)
return err;
*val = (mask & ee_mask & MASK_EE_TOO_HIGH_TEMP) || (mask & ee_mask & MASK_EE_TOO_LOW_TEMP);
return 0;
}
static int ufs_get_temp(struct ufs_hba *hba, enum attr_idn idn, long *val)
{
u32 value;
int err;
err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, idn, 0, 0, &value);
if (err)
return err;
if (value == 0)
return -ENODATA;
*val = ((long)value - 80) * MILLIDEGREE_PER_DEGREE;
return 0;
}
static int ufs_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long *val)
{
struct ufs_hwmon_data *data = dev_get_drvdata(dev);
struct ufs_hba *hba = data->hba;
int err;
down(&hba->host_sem);
if (!ufshcd_is_user_access_allowed(hba)) {
up(&hba->host_sem);
return -EBUSY;
}
ufshcd_rpm_get_sync(hba);
switch (attr) {
case hwmon_temp_enable:
err = ufs_read_temp_enable(hba, data->mask, val);
break;
case hwmon_temp_crit:
err = ufs_get_temp(hba, QUERY_ATTR_IDN_HIGH_TEMP_BOUND, val);
break;
case hwmon_temp_lcrit:
err = ufs_get_temp(hba, QUERY_ATTR_IDN_LOW_TEMP_BOUND, val);
break;
case hwmon_temp_input:
err = ufs_get_temp(hba, QUERY_ATTR_IDN_CASE_ROUGH_TEMP, val);
break;
default:
err = -EOPNOTSUPP;
break;
}
ufshcd_rpm_put_sync(hba);
up(&hba->host_sem);
return err;
}
static int ufs_hwmon_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long val)
{
struct ufs_hwmon_data *data = dev_get_drvdata(dev);
struct ufs_hba *hba = data->hba;
int err;
if (attr != hwmon_temp_enable)
return -EINVAL;
if (val != 0 && val != 1)
return -EINVAL;
down(&hba->host_sem);
if (!ufshcd_is_user_access_allowed(hba)) {
up(&hba->host_sem);
return -EBUSY;
}
ufshcd_rpm_get_sync(hba);
if (val == 1)
err = ufshcd_update_ee_usr_mask(hba, MASK_EE_URGENT_TEMP, 0);
else
err = ufshcd_update_ee_usr_mask(hba, 0, MASK_EE_URGENT_TEMP);
ufshcd_rpm_put_sync(hba);
up(&hba->host_sem);
return err;
}
static umode_t ufs_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
int channel)
{
if (type != hwmon_temp)
return 0;
switch (attr) {
case hwmon_temp_enable:
return 0644;
case hwmon_temp_crit:
case hwmon_temp_lcrit:
case hwmon_temp_input:
return 0444;
default:
break;
}
return 0;
}
static const struct hwmon_channel_info *ufs_hwmon_info[] = {
HWMON_CHANNEL_INFO(temp, HWMON_T_ENABLE | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LCRIT),
NULL
};
static const struct hwmon_ops ufs_hwmon_ops = {
.is_visible = ufs_hwmon_is_visible,
.read = ufs_hwmon_read,
.write = ufs_hwmon_write,
};
static const struct hwmon_chip_info ufs_hwmon_hba_info = {
.ops = &ufs_hwmon_ops,
.info = ufs_hwmon_info,
};
void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask)
{
struct device *dev = hba->dev;
struct ufs_hwmon_data *data;
struct device *hwmon;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return;
data->hba = hba;
data->mask = mask;
hwmon = hwmon_device_register_with_info(dev, "ufs", data, &ufs_hwmon_hba_info, NULL);
if (IS_ERR(hwmon)) {
dev_warn(dev, "Failed to instantiate hwmon device\n");
kfree(data);
return;
}
hba->hwmon_device = hwmon;
}
void ufs_hwmon_remove(struct ufs_hba *hba)
{
struct ufs_hwmon_data *data;
if (!hba->hwmon_device)
return;
data = dev_get_drvdata(hba->hwmon_device);
hwmon_device_unregister(hba->hwmon_device);
hba->hwmon_device = NULL;
kfree(data);
}
void ufs_hwmon_notify_event(struct ufs_hba *hba, u8 ee_mask)
{
if (!hba->hwmon_device)
return;
if (ee_mask & MASK_EE_TOO_HIGH_TEMP)
hwmon_notify_event(hba->hwmon_device, hwmon_temp, hwmon_temp_max_alarm, 0);
if (ee_mask & MASK_EE_TOO_LOW_TEMP)
hwmon_notify_event(hba->hwmon_device, hwmon_temp, hwmon_temp_min_alarm, 0);
}
|
