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// SPDX-License-Identifier: GPL-2.0
/*
* OCC hwmon driver sysfs interface
*
* Copyright (C) IBM Corporation 2018
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/hwmon-sysfs.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include "common.h"
/* OCC status register */
#define OCC_STAT_MASTER BIT(7)
#define OCC_STAT_ACTIVE BIT(0)
/* OCC extended status register */
#define OCC_EXT_STAT_DVFS_OT BIT(7)
#define OCC_EXT_STAT_DVFS_POWER BIT(6)
#define OCC_EXT_STAT_MEM_THROTTLE BIT(5)
#define OCC_EXT_STAT_QUICK_DROP BIT(4)
static ssize_t occ_sysfs_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
int val = 0;
struct occ *occ = dev_get_drvdata(dev);
struct occ_poll_response_header *header;
struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
header = (struct occ_poll_response_header *)occ->resp.data;
switch (sattr->index) {
case 0:
val = !!(header->status & OCC_STAT_MASTER);
break;
case 1:
val = !!(header->status & OCC_STAT_ACTIVE);
break;
case 2:
val = !!(header->status & OCC_EXT_STAT_DVFS_OT);
break;
case 3:
val = !!(header->status & OCC_EXT_STAT_DVFS_POWER);
break;
case 4:
val = !!(header->status & OCC_EXT_STAT_MEM_THROTTLE);
break;
case 5:
val = !!(header->status & OCC_EXT_STAT_QUICK_DROP);
break;
case 6:
val = header->occ_state;
break;
case 7:
if (header->status & OCC_STAT_MASTER)
val = hweight8(header->occs_present);
else
val = 1;
break;
case 8:
val = occ->error;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
}
static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0);
static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1);
static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2);
static SENSOR_DEVICE_ATTR(occ_dvfs_power, 0444, occ_sysfs_show, NULL, 3);
static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4);
static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5);
static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
static SENSOR_DEVICE_ATTR(occ_error, 0444, occ_sysfs_show, NULL, 8);
static struct attribute *occ_attributes[] = {
&sensor_dev_attr_occ_master.dev_attr.attr,
&sensor_dev_attr_occ_active.dev_attr.attr,
&sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr,
&sensor_dev_attr_occ_dvfs_power.dev_attr.attr,
&sensor_dev_attr_occ_mem_throttle.dev_attr.attr,
&sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr,
&sensor_dev_attr_occ_state.dev_attr.attr,
&sensor_dev_attr_occs_present.dev_attr.attr,
&sensor_dev_attr_occ_error.dev_attr.attr,
NULL
};
static const struct attribute_group occ_sysfs = {
.attrs = occ_attributes,
};
void occ_sysfs_poll_done(struct occ *occ)
{
const char *name;
struct occ_poll_response_header *header =
(struct occ_poll_response_header *)occ->resp.data;
/*
* On the first poll response, we haven't yet created the sysfs
* attributes, so don't make any notify calls.
*/
if (!occ->hwmon)
goto done;
if ((header->status & OCC_STAT_MASTER) !=
(occ->prev_stat & OCC_STAT_MASTER)) {
name = sensor_dev_attr_occ_master.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if ((header->status & OCC_STAT_ACTIVE) !=
(occ->prev_stat & OCC_STAT_ACTIVE)) {
name = sensor_dev_attr_occ_active.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if ((header->ext_status & OCC_EXT_STAT_DVFS_OT) !=
(occ->prev_ext_stat & OCC_EXT_STAT_DVFS_OT)) {
name = sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if ((header->ext_status & OCC_EXT_STAT_DVFS_POWER) !=
(occ->prev_ext_stat & OCC_EXT_STAT_DVFS_POWER)) {
name = sensor_dev_attr_occ_dvfs_power.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if ((header->ext_status & OCC_EXT_STAT_MEM_THROTTLE) !=
(occ->prev_ext_stat & OCC_EXT_STAT_MEM_THROTTLE)) {
name = sensor_dev_attr_occ_mem_throttle.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if ((header->ext_status & OCC_EXT_STAT_QUICK_DROP) !=
(occ->prev_ext_stat & OCC_EXT_STAT_QUICK_DROP)) {
name = sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if ((header->status & OCC_STAT_MASTER) &&
header->occs_present != occ->prev_occs_present) {
name = sensor_dev_attr_occs_present.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
if (occ->error && occ->error != occ->prev_error) {
name = sensor_dev_attr_occ_error.dev_attr.attr.name;
sysfs_notify(&occ->bus_dev->kobj, NULL, name);
}
/* no notifications for OCC state; doesn't indicate error condition */
done:
occ->prev_error = occ->error;
occ->prev_stat = header->status;
occ->prev_ext_stat = header->ext_status;
occ->prev_occs_present = header->occs_present;
}
int occ_setup_sysfs(struct occ *occ)
{
return sysfs_create_group(&occ->bus_dev->kobj, &occ_sysfs);
}
void occ_shutdown(struct occ *occ)
{
sysfs_remove_group(&occ->bus_dev->kobj, &occ_sysfs);
}
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