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// 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 "ufshcd.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);
}
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