linux-kernel - Re: [PATCH v3 4/4] hwmon: (pmbus/core): Notify hwmon events

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Message-ID: <dc9985d2-bce0-9645-1010-b195f53164c0@roeck-us.net>
Date:   Sat, 25 Feb 2023 07:42:00 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        Jean Delvare <jdelvare@...e.com>
Cc:     linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] hwmon: (pmbus/core): Notify hwmon events

On 2/17/23 00:36, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
> 
> Notify hwmon events using the pmbus irq handler.
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ...
> Changes in V3:
> - Remove empty line
> - locked version of pmbus_get_flags
> Changes in V2
> - Remove __maybe_unsed attribute as its not needed.
> ---
>   drivers/hwmon/pmbus/pmbus_core.c | 48 ++++++++++++++++++++++++++++----
>   1 file changed, 43 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index d0415d5ac7d9..2d10a354fe7a 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -2761,7 +2761,35 @@ static int __maybe_unused pmbus_is_enabled(struct device *dev, u8 page)
>   	return !!(ret & PB_OPERATION_CONTROL_ON);
>   }
>   
> -static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags)
> +#define to_dev_attr(_dev_attr) \
> +	container_of(_dev_attr, struct device_attribute, attr)
> +
> +static void pmbus_notify(struct pmbus_data *data, int page, int reg, int flags)
> +{
> +	int i;
> +
> +	for (i = 0; i < data->num_attributes; i++) {
> +		struct device_attribute *da = to_dev_attr(data->group.attrs[i]);
> +		struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
> +		int index = attr->index;
> +		u16 smask = pb_index_to_mask(index);
> +		u8 spage = pb_index_to_page(index);
> +		u16 sreg = pb_index_to_reg(index);
> +
> +		if (reg == sreg && page == spage && (smask & flags)) {
> +			dev_dbg(data->dev, "sysfs notify: %s", da->attr.name);
> +			sysfs_notify(&data->dev->kobj, NULL, da->attr.name);
> +			kobject_uevent(&data->dev->kobj, KOBJ_CHANGE);
> +			flags &= ~smask;
> +		}
> +
> +		if (!flags)
> +			break;
> +	}
> +}
> +
> +static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags,
> +			    bool notify)
>   {
>   	int i, status;
>   	const struct pmbus_status_category *cat;
> @@ -2785,6 +2813,10 @@ static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flag
>   			if (status & bit->pflag)
>   				*flags |= bit->rflag;
>   		}
> +
> +		if (notify && status)
> +			pmbus_notify(data, page, cat->reg, status);
> +
>   	}
>   
>   	/*
> @@ -2828,12 +2860,13 @@ static int _pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flag
>   	return 0;
>   }
>   
> -static int __maybe_unused pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags)
> +static int __maybe_unused pmbus_get_flags(struct pmbus_data *data, u8 page, unsigned int *flags,
> +					  bool notify)
>   {
>   	int ret;
>   
>   	mutex_lock(&data->update_lock);
> -	ret = _pmbus_get_flags(data, page, flags);
> +	ret = _pmbus_get_flags(data, page, flags, notify);
>   	mutex_unlock(&data->update_lock);
>   
>   	return ret;
> @@ -2878,7 +2911,7 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
>   	struct i2c_client *client = to_i2c_client(dev->parent);
>   	struct pmbus_data *data = i2c_get_clientdata(client);
>   
> -	return pmbus_get_flags(data, rdev_get_id(rdev), flags);
> +	return pmbus_get_flags(data, rdev_get_id(rdev), flags, false);
>   }
>   
>   static int pmbus_regulator_get_status(struct regulator_dev *rdev)
> @@ -3114,10 +3147,14 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
>   {
>   	struct pmbus_data *data = pdata;
>   	struct i2c_client *client = to_i2c_client(data->dev);
> -	int i, status;
> +	int i, status, ret;
>   
>   	mutex_lock(&data->update_lock);
>   	for (i = 0; i < data->info->pages; i++) {
> +		ret = _pmbus_get_flags(data, i, &status, true);
> +		if (ret)
> +			return ret;
> +

Same as with patch 3 - this is not a valid return value for an
interrupt handler.

>   		status = pmbus_read_status_word(client, i);
>   		if (status < 0) {
>   			mutex_unlock(&data->update_lock);
> @@ -3126,6 +3163,7 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
>   
>   		if (status & ~(PB_STATUS_OFF | PB_STATUS_BUSY | PB_STATUS_POWER_GOOD_N))
>   			pmbus_clear_fault_page(client, i);
> +

Stray whitespace change.

>   	}
>   	mutex_unlock(&data->update_lock);
>