linux/drivers/platform/mellanox/mlxreg-hotplug.c
Daniil Dulov 30f96b2cb7
platform/mellanox: mlxreg-hotplug: Remove redundant NULL-check
Pointer item is checked fo NULL at mlxreg_hotplug_work_helper() and then
it is dereferenced to produce dev_err().
This pointer is also dereferenced before calling this function and should
never be NULL except some piece of hardware is broken as it is said in
the comment before the check. So, this check can be safely removed.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: c6acad68eb ("platform/mellanox: mlxreg-hotplug: Modify to use a regmap interface")
Signed-off-by: Daniil Dulov <d.dulov@aladdin.ru>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20240306153804.6509-1-d.dulov@aladdin.ru
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
2024-03-12 12:48:36 +02:00

798 lines
21 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Mellanox hotplug driver
*
* Copyright (C) 2016-2020 Mellanox Technologies
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_data/mlxreg.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/string_helpers.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>
/* Offset of event and mask registers from status register. */
#define MLXREG_HOTPLUG_EVENT_OFF 1
#define MLXREG_HOTPLUG_MASK_OFF 2
#define MLXREG_HOTPLUG_AGGR_MASK_OFF 1
/* ASIC good health mask. */
#define MLXREG_HOTPLUG_GOOD_HEALTH_MASK 0x02
#define MLXREG_HOTPLUG_ATTRS_MAX 128
#define MLXREG_HOTPLUG_NOT_ASSERT 3
/**
* struct mlxreg_hotplug_priv_data - platform private data:
* @irq: platform device interrupt number;
* @dev: basic device;
* @pdev: platform device;
* @plat: platform data;
* @regmap: register map handle;
* @dwork_irq: delayed work template;
* @lock: spin lock;
* @hwmon: hwmon device;
* @mlxreg_hotplug_attr: sysfs attributes array;
* @mlxreg_hotplug_dev_attr: sysfs sensor device attribute array;
* @group: sysfs attribute group;
* @groups: list of sysfs attribute group for hwmon registration;
* @cell: location of top aggregation interrupt register;
* @mask: top aggregation interrupt common mask;
* @aggr_cache: last value of aggregation register status;
* @after_probe: flag indication probing completion;
* @not_asserted: number of entries in workqueue with no signal assertion;
*/
struct mlxreg_hotplug_priv_data {
int irq;
struct device *dev;
struct platform_device *pdev;
struct mlxreg_hotplug_platform_data *plat;
struct regmap *regmap;
struct delayed_work dwork_irq;
spinlock_t lock; /* sync with interrupt */
struct device *hwmon;
struct attribute *mlxreg_hotplug_attr[MLXREG_HOTPLUG_ATTRS_MAX + 1];
struct sensor_device_attribute_2
mlxreg_hotplug_dev_attr[MLXREG_HOTPLUG_ATTRS_MAX];
struct attribute_group group;
const struct attribute_group *groups[2];
u32 cell;
u32 mask;
u32 aggr_cache;
bool after_probe;
u8 not_asserted;
};
/* Environment variables array for udev. */
static char *mlxreg_hotplug_udev_envp[] = { NULL, NULL };
static int
mlxreg_hotplug_udev_event_send(struct kobject *kobj,
struct mlxreg_core_data *data, bool action)
{
char event_str[MLXREG_CORE_LABEL_MAX_SIZE + 2];
char label[MLXREG_CORE_LABEL_MAX_SIZE] = { 0 };
mlxreg_hotplug_udev_envp[0] = event_str;
string_upper(label, data->label);
snprintf(event_str, MLXREG_CORE_LABEL_MAX_SIZE, "%s=%d", label, !!action);
return kobject_uevent_env(kobj, KOBJ_CHANGE, mlxreg_hotplug_udev_envp);
}
static void
mlxreg_hotplug_pdata_export(void *pdata, void *regmap)
{
struct mlxreg_core_hotplug_platform_data *dev_pdata = pdata;
/* Export regmap to underlying device. */
dev_pdata->regmap = regmap;
}
static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv,
struct mlxreg_core_data *data,
enum mlxreg_hotplug_kind kind)
{
struct i2c_board_info *brdinfo = data->hpdev.brdinfo;
struct mlxreg_core_hotplug_platform_data *pdata;
struct i2c_client *client;
/* Notify user by sending hwmon uevent. */
mlxreg_hotplug_udev_event_send(&priv->hwmon->kobj, data, true);
/*
* Return if adapter number is negative. It could be in case hotplug
* event is not associated with hotplug device.
*/
if (data->hpdev.nr < 0 && data->hpdev.action != MLXREG_HOTPLUG_DEVICE_NO_ACTION)
return 0;
pdata = dev_get_platdata(&priv->pdev->dev);
switch (data->hpdev.action) {
case MLXREG_HOTPLUG_DEVICE_DEFAULT_ACTION:
data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr +
pdata->shift_nr);
if (!data->hpdev.adapter) {
dev_err(priv->dev, "Failed to get adapter for bus %d\n",
data->hpdev.nr + pdata->shift_nr);
return -EFAULT;
}
/* Export platform data to underlying device. */
if (brdinfo->platform_data)
mlxreg_hotplug_pdata_export(brdinfo->platform_data, pdata->regmap);
client = i2c_new_client_device(data->hpdev.adapter,
brdinfo);
if (IS_ERR(client)) {
dev_err(priv->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
brdinfo->type, data->hpdev.nr +
pdata->shift_nr, brdinfo->addr);
i2c_put_adapter(data->hpdev.adapter);
data->hpdev.adapter = NULL;
return PTR_ERR(client);
}
data->hpdev.client = client;
break;
case MLXREG_HOTPLUG_DEVICE_PLATFORM_ACTION:
/* Export platform data to underlying device. */
if (data->hpdev.brdinfo && data->hpdev.brdinfo->platform_data)
mlxreg_hotplug_pdata_export(data->hpdev.brdinfo->platform_data,
pdata->regmap);
/* Pass parent hotplug device handle to underlying device. */
data->notifier = data->hpdev.notifier;
data->hpdev.pdev = platform_device_register_resndata(&priv->pdev->dev,
brdinfo->type,
data->hpdev.nr,
NULL, 0, data,
sizeof(*data));
if (IS_ERR(data->hpdev.pdev))
return PTR_ERR(data->hpdev.pdev);
break;
default:
break;
}
if (data->hpdev.notifier && data->hpdev.notifier->user_handler)
return data->hpdev.notifier->user_handler(data->hpdev.notifier->handle, kind, 1);
return 0;
}
static void
mlxreg_hotplug_device_destroy(struct mlxreg_hotplug_priv_data *priv,
struct mlxreg_core_data *data,
enum mlxreg_hotplug_kind kind)
{
/* Notify user by sending hwmon uevent. */
mlxreg_hotplug_udev_event_send(&priv->hwmon->kobj, data, false);
if (data->hpdev.notifier && data->hpdev.notifier->user_handler)
data->hpdev.notifier->user_handler(data->hpdev.notifier->handle, kind, 0);
switch (data->hpdev.action) {
case MLXREG_HOTPLUG_DEVICE_DEFAULT_ACTION:
if (data->hpdev.client) {
i2c_unregister_device(data->hpdev.client);
data->hpdev.client = NULL;
}
if (data->hpdev.adapter) {
i2c_put_adapter(data->hpdev.adapter);
data->hpdev.adapter = NULL;
}
break;
case MLXREG_HOTPLUG_DEVICE_PLATFORM_ACTION:
if (data->hpdev.pdev)
platform_device_unregister(data->hpdev.pdev);
break;
default:
break;
}
}
static ssize_t mlxreg_hotplug_attr_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(dev);
struct mlxreg_core_hotplug_platform_data *pdata;
int index = to_sensor_dev_attr_2(attr)->index;
int nr = to_sensor_dev_attr_2(attr)->nr;
struct mlxreg_core_item *item;
struct mlxreg_core_data *data;
u32 regval;
int ret;
pdata = dev_get_platdata(&priv->pdev->dev);
item = pdata->items + nr;
data = item->data + index;
ret = regmap_read(priv->regmap, data->reg, &regval);
if (ret)
return ret;
if (item->health) {
regval &= data->mask;
} else {
/* Bit = 0 : functional if item->inversed is true. */
if (item->inversed)
regval = !(regval & data->mask);
else
regval = !!(regval & data->mask);
}
return sprintf(buf, "%u\n", regval);
}
#define PRIV_ATTR(i) priv->mlxreg_hotplug_attr[i]
#define PRIV_DEV_ATTR(i) priv->mlxreg_hotplug_dev_attr[i]
static int mlxreg_hotplug_item_label_index_get(u32 mask, u32 bit)
{
int i, j;
for (i = 0, j = -1; i <= bit; i++) {
if (mask & BIT(i))
j++;
}
return j;
}
static int mlxreg_hotplug_attr_init(struct mlxreg_hotplug_priv_data *priv)
{
struct mlxreg_core_hotplug_platform_data *pdata;
struct mlxreg_core_item *item;
struct mlxreg_core_data *data;
unsigned long mask;
u32 regval;
int num_attrs = 0, id = 0, i, j, k, count, ret;
pdata = dev_get_platdata(&priv->pdev->dev);
item = pdata->items;
/* Go over all kinds of items - psu, pwr, fan. */
for (i = 0; i < pdata->counter; i++, item++) {
if (item->capability) {
/*
* Read group capability register to get actual number
* of interrupt capable components and set group mask
* accordingly.
*/
ret = regmap_read(priv->regmap, item->capability,
&regval);
if (ret)
return ret;
item->mask = GENMASK((regval & item->mask) - 1, 0);
}
data = item->data;
/* Go over all unmasked units within item. */
mask = item->mask;
k = 0;
count = item->ind ? item->ind : item->count;
for_each_set_bit(j, &mask, count) {
if (data->capability) {
/*
* Read capability register and skip non
* relevant attributes.
*/
ret = regmap_read(priv->regmap,
data->capability, &regval);
if (ret)
return ret;
if (!(regval & data->bit)) {
data++;
continue;
}
}
PRIV_ATTR(id) = &PRIV_DEV_ATTR(id).dev_attr.attr;
PRIV_ATTR(id)->name = devm_kasprintf(&priv->pdev->dev,
GFP_KERNEL,
data->label);
if (!PRIV_ATTR(id)->name) {
dev_err(priv->dev, "Memory allocation failed for attr %d.\n",
id);
return -ENOMEM;
}
PRIV_DEV_ATTR(id).dev_attr.attr.name =
PRIV_ATTR(id)->name;
PRIV_DEV_ATTR(id).dev_attr.attr.mode = 0444;
PRIV_DEV_ATTR(id).dev_attr.show =
mlxreg_hotplug_attr_show;
PRIV_DEV_ATTR(id).nr = i;
PRIV_DEV_ATTR(id).index = k;
sysfs_attr_init(&PRIV_DEV_ATTR(id).dev_attr.attr);
data++;
id++;
k++;
}
num_attrs += k;
}
priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
num_attrs,
sizeof(struct attribute *),
GFP_KERNEL);
if (!priv->group.attrs)
return -ENOMEM;
priv->group.attrs = priv->mlxreg_hotplug_attr;
priv->groups[0] = &priv->group;
priv->groups[1] = NULL;
return 0;
}
static void
mlxreg_hotplug_work_helper(struct mlxreg_hotplug_priv_data *priv,
struct mlxreg_core_item *item)
{
struct mlxreg_core_data *data;
unsigned long asserted;
u32 regval, bit;
int ret;
/* Mask event. */
ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
0);
if (ret)
goto out;
/* Read status. */
ret = regmap_read(priv->regmap, item->reg, &regval);
if (ret)
goto out;
/* Set asserted bits and save last status. */
regval &= item->mask;
asserted = item->cache ^ regval;
item->cache = regval;
for_each_set_bit(bit, &asserted, 8) {
int pos;
pos = mlxreg_hotplug_item_label_index_get(item->mask, bit);
if (pos < 0)
goto out;
data = item->data + pos;
if (regval & BIT(bit)) {
if (item->inversed)
mlxreg_hotplug_device_destroy(priv, data, item->kind);
else
mlxreg_hotplug_device_create(priv, data, item->kind);
} else {
if (item->inversed)
mlxreg_hotplug_device_create(priv, data, item->kind);
else
mlxreg_hotplug_device_destroy(priv, data, item->kind);
}
}
/* Acknowledge event. */
ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_EVENT_OFF,
0);
if (ret)
goto out;
/* Unmask event. */
ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
item->mask);
out:
if (ret)
dev_err(priv->dev, "Failed to complete workqueue.\n");
}
static void
mlxreg_hotplug_health_work_helper(struct mlxreg_hotplug_priv_data *priv,
struct mlxreg_core_item *item)
{
struct mlxreg_core_data *data = item->data;
u32 regval;
int i, ret = 0;
for (i = 0; i < item->count; i++, data++) {
/* Mask event. */
ret = regmap_write(priv->regmap, data->reg +
MLXREG_HOTPLUG_MASK_OFF, 0);
if (ret)
goto out;
/* Read status. */
ret = regmap_read(priv->regmap, data->reg, &regval);
if (ret)
goto out;
regval &= data->mask;
if (item->cache == regval)
goto ack_event;
/*
* ASIC health indication is provided through two bits. Bits
* value 0x2 indicates that ASIC reached the good health, value
* 0x0 indicates ASIC the bad health or dormant state and value
* 0x3 indicates the booting state. During ASIC reset it should
* pass the following states: dormant -> booting -> good.
*/
if (regval == MLXREG_HOTPLUG_GOOD_HEALTH_MASK) {
if (!data->attached) {
/*
* ASIC is in steady state. Connect associated
* device, if configured.
*/
mlxreg_hotplug_device_create(priv, data, item->kind);
data->attached = true;
}
} else {
if (data->attached) {
/*
* ASIC health is failed after ASIC has been
* in steady state. Disconnect associated
* device, if it has been connected.
*/
mlxreg_hotplug_device_destroy(priv, data, item->kind);
data->attached = false;
data->health_cntr = 0;
}
}
item->cache = regval;
ack_event:
/* Acknowledge event. */
ret = regmap_write(priv->regmap, data->reg +
MLXREG_HOTPLUG_EVENT_OFF, 0);
if (ret)
goto out;
/* Unmask event. */
ret = regmap_write(priv->regmap, data->reg +
MLXREG_HOTPLUG_MASK_OFF, data->mask);
if (ret)
goto out;
}
out:
if (ret)
dev_err(priv->dev, "Failed to complete workqueue.\n");
}
/*
* mlxreg_hotplug_work_handler - performs traversing of device interrupt
* registers according to the below hierarchy schema:
*
* Aggregation registers (status/mask)
* PSU registers: *---*
* *-----------------* | |
* |status/event/mask|-----> | * |
* *-----------------* | |
* Power registers: | |
* *-----------------* | |
* |status/event/mask|-----> | * |
* *-----------------* | |
* FAN registers: | |--> CPU
* *-----------------* | |
* |status/event/mask|-----> | * |
* *-----------------* | |
* ASIC registers: | |
* *-----------------* | |
* |status/event/mask|-----> | * |
* *-----------------* | |
* *---*
*
* In case some system changed are detected: FAN in/out, PSU in/out, power
* cable attached/detached, ASIC health good/bad, relevant device is created
* or destroyed.
*/
static void mlxreg_hotplug_work_handler(struct work_struct *work)
{
struct mlxreg_core_hotplug_platform_data *pdata;
struct mlxreg_hotplug_priv_data *priv;
struct mlxreg_core_item *item;
u32 regval, aggr_asserted;
unsigned long flags;
int i, ret;
priv = container_of(work, struct mlxreg_hotplug_priv_data,
dwork_irq.work);
pdata = dev_get_platdata(&priv->pdev->dev);
item = pdata->items;
/* Mask aggregation event. */
ret = regmap_write(priv->regmap, pdata->cell +
MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
if (ret < 0)
goto out;
/* Read aggregation status. */
ret = regmap_read(priv->regmap, pdata->cell, &regval);
if (ret)
goto out;
regval &= pdata->mask;
aggr_asserted = priv->aggr_cache ^ regval;
priv->aggr_cache = regval;
/*
* Handler is invoked, but no assertion is detected at top aggregation
* status level. Set aggr_asserted to mask value to allow handler extra
* run over all relevant signals to recover any missed signal.
*/
if (priv->not_asserted == MLXREG_HOTPLUG_NOT_ASSERT) {
priv->not_asserted = 0;
aggr_asserted = pdata->mask;
}
if (!aggr_asserted)
goto unmask_event;
/* Handle topology and health configuration changes. */
for (i = 0; i < pdata->counter; i++, item++) {
if (aggr_asserted & item->aggr_mask) {
if (item->health)
mlxreg_hotplug_health_work_helper(priv, item);
else
mlxreg_hotplug_work_helper(priv, item);
}
}
spin_lock_irqsave(&priv->lock, flags);
/*
* It is possible, that some signals have been inserted, while
* interrupt has been masked by mlxreg_hotplug_work_handler. In this
* case such signals will be missed. In order to handle these signals
* delayed work is canceled and work task re-scheduled for immediate
* execution. It allows to handle missed signals, if any. In other case
* work handler just validates that no new signals have been received
* during masking.
*/
cancel_delayed_work(&priv->dwork_irq);
schedule_delayed_work(&priv->dwork_irq, 0);
spin_unlock_irqrestore(&priv->lock, flags);
return;
unmask_event:
priv->not_asserted++;
/* Unmask aggregation event (no need acknowledge). */
ret = regmap_write(priv->regmap, pdata->cell +
MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
out:
if (ret)
dev_err(priv->dev, "Failed to complete workqueue.\n");
}
static int mlxreg_hotplug_set_irq(struct mlxreg_hotplug_priv_data *priv)
{
struct mlxreg_core_hotplug_platform_data *pdata;
struct mlxreg_core_item *item;
struct mlxreg_core_data *data;
u32 regval;
int i, j, ret;
pdata = dev_get_platdata(&priv->pdev->dev);
item = pdata->items;
for (i = 0; i < pdata->counter; i++, item++) {
/* Clear group presense event. */
ret = regmap_write(priv->regmap, item->reg +
MLXREG_HOTPLUG_EVENT_OFF, 0);
if (ret)
goto out;
/*
* Verify if hardware configuration requires to disable
* interrupt capability for some of components.
*/
data = item->data;
for (j = 0; j < item->count; j++, data++) {
/* Verify if the attribute has capability register. */
if (data->capability) {
/* Read capability register. */
ret = regmap_read(priv->regmap,
data->capability, &regval);
if (ret)
goto out;
if (!(regval & data->bit))
item->mask &= ~BIT(j);
}
}
/* Set group initial status as mask and unmask group event. */
if (item->inversed) {
item->cache = item->mask;
ret = regmap_write(priv->regmap, item->reg +
MLXREG_HOTPLUG_MASK_OFF,
item->mask);
if (ret)
goto out;
}
}
/* Keep aggregation initial status as zero and unmask events. */
ret = regmap_write(priv->regmap, pdata->cell +
MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
if (ret)
goto out;
/* Keep low aggregation initial status as zero and unmask events. */
if (pdata->cell_low) {
ret = regmap_write(priv->regmap, pdata->cell_low +
MLXREG_HOTPLUG_AGGR_MASK_OFF,
pdata->mask_low);
if (ret)
goto out;
}
/* Invoke work handler for initializing hot plug devices setting. */
mlxreg_hotplug_work_handler(&priv->dwork_irq.work);
out:
if (ret)
dev_err(priv->dev, "Failed to set interrupts.\n");
enable_irq(priv->irq);
return ret;
}
static void mlxreg_hotplug_unset_irq(struct mlxreg_hotplug_priv_data *priv)
{
struct mlxreg_core_hotplug_platform_data *pdata;
struct mlxreg_core_item *item;
struct mlxreg_core_data *data;
int count, i, j;
pdata = dev_get_platdata(&priv->pdev->dev);
item = pdata->items;
disable_irq(priv->irq);
cancel_delayed_work_sync(&priv->dwork_irq);
/* Mask low aggregation event, if defined. */
if (pdata->cell_low)
regmap_write(priv->regmap, pdata->cell_low +
MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
/* Mask aggregation event. */
regmap_write(priv->regmap, pdata->cell + MLXREG_HOTPLUG_AGGR_MASK_OFF,
0);
/* Clear topology configurations. */
for (i = 0; i < pdata->counter; i++, item++) {
data = item->data;
/* Mask group presense event. */
regmap_write(priv->regmap, data->reg + MLXREG_HOTPLUG_MASK_OFF,
0);
/* Clear group presense event. */
regmap_write(priv->regmap, data->reg +
MLXREG_HOTPLUG_EVENT_OFF, 0);
/* Remove all the attached devices in group. */
count = item->count;
for (j = 0; j < count; j++, data++)
mlxreg_hotplug_device_destroy(priv, data, item->kind);
}
}
static irqreturn_t mlxreg_hotplug_irq_handler(int irq, void *dev)
{
struct mlxreg_hotplug_priv_data *priv;
priv = (struct mlxreg_hotplug_priv_data *)dev;
/* Schedule work task for immediate execution.*/
schedule_delayed_work(&priv->dwork_irq, 0);
return IRQ_HANDLED;
}
static int mlxreg_hotplug_probe(struct platform_device *pdev)
{
struct mlxreg_core_hotplug_platform_data *pdata;
struct mlxreg_hotplug_priv_data *priv;
struct i2c_adapter *deferred_adap;
int err;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
dev_err(&pdev->dev, "Failed to get platform data.\n");
return -EINVAL;
}
/* Defer probing if the necessary adapter is not configured yet. */
deferred_adap = i2c_get_adapter(pdata->deferred_nr);
if (!deferred_adap)
return -EPROBE_DEFER;
i2c_put_adapter(deferred_adap);
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (pdata->irq) {
priv->irq = pdata->irq;
} else {
priv->irq = platform_get_irq(pdev, 0);
if (priv->irq < 0)
return priv->irq;
}
priv->regmap = pdata->regmap;
priv->dev = pdev->dev.parent;
priv->pdev = pdev;
err = devm_request_irq(&pdev->dev, priv->irq,
mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING
| IRQF_SHARED, "mlxreg-hotplug", priv);
if (err) {
dev_err(&pdev->dev, "Failed to request irq: %d\n", err);
return err;
}
disable_irq(priv->irq);
spin_lock_init(&priv->lock);
INIT_DELAYED_WORK(&priv->dwork_irq, mlxreg_hotplug_work_handler);
dev_set_drvdata(&pdev->dev, priv);
err = mlxreg_hotplug_attr_init(priv);
if (err) {
dev_err(&pdev->dev, "Failed to allocate attributes: %d\n",
err);
return err;
}
priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
"mlxreg_hotplug", priv, priv->groups);
if (IS_ERR(priv->hwmon)) {
dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
PTR_ERR(priv->hwmon));
return PTR_ERR(priv->hwmon);
}
/* Perform initial interrupts setup. */
mlxreg_hotplug_set_irq(priv);
priv->after_probe = true;
return 0;
}
static void mlxreg_hotplug_remove(struct platform_device *pdev)
{
struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(&pdev->dev);
/* Clean interrupts setup. */
mlxreg_hotplug_unset_irq(priv);
devm_free_irq(&pdev->dev, priv->irq, priv);
}
static struct platform_driver mlxreg_hotplug_driver = {
.driver = {
.name = "mlxreg-hotplug",
},
.probe = mlxreg_hotplug_probe,
.remove_new = mlxreg_hotplug_remove,
};
module_platform_driver(mlxreg_hotplug_driver);
MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("Mellanox regmap hotplug platform driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:mlxreg-hotplug");