linux-kernel - Re: [PATCH v5 3/5] hwmon: (pmbus/core): Notify hwmon events

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Message-ID: <20221201201537.GC2110128@roeck-us.net>
Date:   Thu, 1 Dec 2022 12:15:37 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Naresh Solanki <naresh.solanki@...ements.com>
Cc:     devicetree@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>
Subject: Re: [PATCH v5 3/5] hwmon: (pmbus/core): Notify hwmon events

On Thu, Dec 01, 2022 at 08:30:22PM +0100, Naresh Solanki wrote:
> Notify hwmon events using the pmbus irq handler.
> 

Unfortunately, as implemented, this only works if regulator support
is enabled, which is unacceptable.

Guenter

> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
>  drivers/hwmon/pmbus/pmbus_core.c | 46 +++++++++++++++++++++++++++++---
>  1 file changed, 43 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index 6a3a3fd59b8e..ad3c0cc884a4 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -2782,7 +2782,35 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
>  	},
>  };
>  
> -static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, 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_regulator_get_flags(struct regulator_dev *rdev, unsigned int *error,
> +				    bool notify)
>  {
>  	int i, status;
>  	const struct pmbus_regulator_status_category *cat;
> @@ -2812,6 +2840,9 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
>  			if (status & bit->pflag)
>  				*flags |= bit->rflag;
>  		}
> +
> +		if (notify && status)
> +			pmbus_notify(data, page, cat->reg, status);
>  	}
>  
>  	/*
> @@ -2856,6 +2887,11 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
>  	return 0;
>  }
>  
> +static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
> +{
> +	return pmbus_regulator_get_flags(rdev, flags, false);
> +}
> +
>  static int pmbus_regulator_get_status(struct regulator_dev *rdev)
>  {
>  	struct device *dev = rdev_get_dev(rdev);
> @@ -3087,7 +3123,7 @@ 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, ret = IRQ_NONE, status;
>  	u8 page;
>  
>  	for (i = 0; i < data->info->num_regulators; i++) {
> @@ -3095,6 +3131,10 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
>  		if (!data->rdevs[i])
>  			continue;
>  
> +		ret = pmbus_regulator_get_flags(data->rdevs[i], &status, true);
> +		if (ret)
> +			return ret;
> +
>  		page = rdev_get_id(data->rdevs[i]);
>  		mutex_lock(&data->update_lock);
>  		status = pmbus_read_status_word(client, page);
> @@ -3109,7 +3149,7 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
>  		mutex_unlock(&data->update_lock);
>  	}
>  
> -	return IRQ_HANDLED;
> +	return ret;
>  }
>  
>  static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
> -- 
> 2.37.3
>