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// SPDX-License-Identifier: GPL-2.0
/*
* Hardware monitoring (hwmon) support for the LSI / Broadcom mpt3sas
* SAS HBA driver. Exposes the IOC and board temperature sensors by
* reading MPI IO Unit Page 7.
*/
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/slab.h>
#include "mpt3sas_base.h"
struct mpt3sas_hwmon {
struct MPT3SAS_ADAPTER *ioc;
struct device *hwmon_dev;
bool ioc_present;
bool board_present;
};
/*
* Convert a (raw, units) reading to millidegrees Celsius.
* Returns -ENODATA when the sensor reports "not present" or
* unknown units. Temperature values are interpreted as signed
* two's-complement integers.
*
* The MPI2_IOUNITPAGE7_IOC_TEMP_* and MPI2_IOUNITPAGE7_BOARD_TEMP_*
* defines in mpi2_cnfg.h share the same values; the IOC ones are
* used for both channels.
*/
static int _hwmon_to_mdegc(s16 raw, u8 units, long *out)
{
switch (units) {
case MPI2_IOUNITPAGE7_IOC_TEMP_CELSIUS:
*out = (long)raw * 1000;
return 0;
case MPI2_IOUNITPAGE7_IOC_TEMP_FAHRENHEIT:
/* (F - 32) * 5 / 9, expressed in milli-units */
*out = ((long)raw - 32) * 5000 / 9;
return 0;
default:
return -ENODATA;
}
}
static umode_t _hwmon_is_visible(const void *drvdata,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct mpt3sas_hwmon *h = drvdata;
if (type != hwmon_temp)
return 0;
if (attr != hwmon_temp_input && attr != hwmon_temp_label)
return 0;
if (channel == 0 && h->ioc_present)
return 0444;
if (channel == 1 && h->board_present)
return 0444;
return 0;
}
static int _hwmon_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct mpt3sas_hwmon *h = dev_get_drvdata(dev);
Mpi2ConfigReply_t mpi_reply;
Mpi2IOUnitPage7_t page;
int r;
if (type != hwmon_temp || attr != hwmon_temp_input)
return -EOPNOTSUPP;
r = mpt3sas_config_get_iounit_pg7(h->ioc, &mpi_reply, &page);
if (r)
return r;
if (channel == 0)
return _hwmon_to_mdegc((s16)le16_to_cpu(page.IOCTemperature),
page.IOCTemperatureUnits, val);
if (channel == 1)
return _hwmon_to_mdegc((s16)le16_to_cpu(page.BoardTemperature),
page.BoardTemperatureUnits, val);
return -EOPNOTSUPP;
}
static const char * const mpt3sas_hwmon_temp_labels[] = {
"IOC",
"Board",
};
static int _hwmon_read_string(struct device *dev,
enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
if (type != hwmon_temp || attr != hwmon_temp_label)
return -EOPNOTSUPP;
*str = mpt3sas_hwmon_temp_labels[channel];
return 0;
}
static const struct hwmon_channel_info * const mpt3sas_hwmon_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
NULL,
};
static const struct hwmon_ops mpt3sas_hwmon_ops = {
.is_visible = _hwmon_is_visible,
.read = _hwmon_read,
.read_string = _hwmon_read_string,
};
static const struct hwmon_chip_info mpt3sas_hwmon_chip_info = {
.ops = &mpt3sas_hwmon_ops,
.info = mpt3sas_hwmon_info,
};
/**
* mpt3sas_hwmon_register - register an hwmon device for the IOC
* @ioc: per adapter object
* Context: sleep.
*
* Succeeds without registering when no temperature sensors are present,
* so cards without thermal monitoring do not expose an empty hwmon node.
* Paired with mpt3sas_hwmon_unregister() from the driver's remove path.
*
* Return: 0 for success, non-zero for failure.
*/
int mpt3sas_hwmon_register(struct MPT3SAS_ADAPTER *ioc)
{
struct device *parent = &ioc->pdev->dev;
struct mpt3sas_hwmon *h;
struct device *hwdev;
Mpi2ConfigReply_t mpi_reply;
Mpi2IOUnitPage7_t page;
int r;
r = mpt3sas_config_get_iounit_pg7(ioc, &mpi_reply, &page);
if (r)
return r;
/*
* A page where both *TemperatureUnits are NOT_PRESENT covers
* two cases: cards that genuinely lack sensors, and firmware
* errors that left the page zero-filled (the accessor mirrors
* _config_request() behaviour). Either way: skip registration.
*/
if (page.IOCTemperatureUnits == MPI2_IOUNITPAGE7_IOC_TEMP_NOT_PRESENT &&
page.BoardTemperatureUnits == MPI2_IOUNITPAGE7_BOARD_TEMP_NOT_PRESENT)
return 0;
h = kzalloc_obj(*h);
if (!h)
return -ENOMEM;
h->ioc = ioc;
h->ioc_present = page.IOCTemperatureUnits != MPI2_IOUNITPAGE7_IOC_TEMP_NOT_PRESENT;
h->board_present = page.BoardTemperatureUnits != MPI2_IOUNITPAGE7_BOARD_TEMP_NOT_PRESENT;
hwdev = hwmon_device_register_with_info(parent, "mpt3sas", h,
&mpt3sas_hwmon_chip_info,
NULL);
if (IS_ERR(hwdev)) {
kfree(h);
return PTR_ERR(hwdev);
}
h->hwmon_dev = hwdev;
ioc->hwmon = h;
return 0;
}
/**
* mpt3sas_hwmon_unregister - tear down the hwmon device, if any
* @ioc: per adapter object
*
* Safe to call when registration was skipped (no sensors) or
* failed; in those cases ioc->hwmon is NULL and this is a no-op.
*/
void mpt3sas_hwmon_unregister(struct MPT3SAS_ADAPTER *ioc)
{
struct mpt3sas_hwmon *h = ioc->hwmon;
if (!h)
return;
hwmon_device_unregister(h->hwmon_dev);
kfree(h);
ioc->hwmon = NULL;
}
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