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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Western Digital Corporation
#include <linux/err.h>
#include <linux/string.h>
#include "ufs-sysfs.h"
static const char *ufschd_uic_link_state_to_string(
enum uic_link_state state)
{
switch (state) {
case UIC_LINK_OFF_STATE: return "OFF";
case UIC_LINK_ACTIVE_STATE: return "ACTIVE";
case UIC_LINK_HIBERN8_STATE: return "HIBERN8";
default: return "UNKNOWN";
}
}
static const char *ufschd_ufs_dev_pwr_mode_to_string(
enum ufs_dev_pwr_mode state)
{
switch (state) {
case UFS_ACTIVE_PWR_MODE: return "ACTIVE";
case UFS_SLEEP_PWR_MODE: return "SLEEP";
case UFS_POWERDOWN_PWR_MODE: return "POWERDOWN";
default: return "UNKNOWN";
}
}
static inline ssize_t ufs_sysfs_pm_lvl_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count,
bool rpm)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
unsigned long flags, value;
if (kstrtoul(buf, 0, &value))
return -EINVAL;
if (value >= UFS_PM_LVL_MAX)
return -EINVAL;
spin_lock_irqsave(hba->host->host_lock, flags);
if (rpm)
hba->rpm_lvl = value;
else
hba->spm_lvl = value;
spin_unlock_irqrestore(hba->host->host_lock, flags);
return count;
}
static ssize_t rpm_lvl_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
int curr_len;
u8 lvl;
curr_len = snprintf(buf, PAGE_SIZE,
"\nCurrent Runtime PM level [%d] => dev_state [%s] link_state [%s]\n",
hba->rpm_lvl,
ufschd_ufs_dev_pwr_mode_to_string(
ufs_pm_lvl_states[hba->rpm_lvl].dev_state),
ufschd_uic_link_state_to_string(
ufs_pm_lvl_states[hba->rpm_lvl].link_state));
curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
"\nAll available Runtime PM levels info:\n");
for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++)
curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
"\tRuntime PM level [%d] => dev_state [%s] link_state [%s]\n",
lvl,
ufschd_ufs_dev_pwr_mode_to_string(
ufs_pm_lvl_states[lvl].dev_state),
ufschd_uic_link_state_to_string(
ufs_pm_lvl_states[lvl].link_state));
return curr_len;
}
static ssize_t rpm_lvl_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return ufs_sysfs_pm_lvl_store(dev, attr, buf, count, true);
}
static ssize_t spm_lvl_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
int curr_len;
u8 lvl;
curr_len = snprintf(buf, PAGE_SIZE,
"\nCurrent System PM level [%d] => dev_state [%s] link_state [%s]\n",
hba->spm_lvl,
ufschd_ufs_dev_pwr_mode_to_string(
ufs_pm_lvl_states[hba->spm_lvl].dev_state),
ufschd_uic_link_state_to_string(
ufs_pm_lvl_states[hba->spm_lvl].link_state));
curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
"\nAll available System PM levels info:\n");
for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++)
curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
"\tSystem PM level [%d] => dev_state [%s] link_state [%s]\n",
lvl,
ufschd_ufs_dev_pwr_mode_to_string(
ufs_pm_lvl_states[lvl].dev_state),
ufschd_uic_link_state_to_string(
ufs_pm_lvl_states[lvl].link_state));
return curr_len;
}
static ssize_t spm_lvl_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return ufs_sysfs_pm_lvl_store(dev, attr, buf, count, false);
}
static DEVICE_ATTR_RW(rpm_lvl);
static DEVICE_ATTR_RW(spm_lvl);
static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
&dev_attr_rpm_lvl.attr,
&dev_attr_spm_lvl.attr,
NULL
};
static const struct attribute_group ufs_sysfs_default_group = {
.attrs = ufs_sysfs_ufshcd_attrs,
};
static const struct attribute_group *ufs_sysfs_groups[] = {
&ufs_sysfs_default_group,
NULL,
};
void ufs_sysfs_add_nodes(struct device *dev)
{
int ret;
ret = sysfs_create_groups(&dev->kobj, ufs_sysfs_groups);
if (ret)
dev_err(dev,
"%s: sysfs groups creation failed (err = %d)\n",
__func__, ret);
}
void ufs_sysfs_remove_nodes(struct device *dev)
{
sysfs_remove_groups(&dev->kobj, ufs_sysfs_groups);
}
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