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

[Naresh Solanki <naresh.solanki@xxxxxxxxxxxxx>]

Hi Guenter

On 02-12-2022 01:45 am, Guenter Roeck wrote:
> 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.
Will work on this to check all pages instead of regulators. I hope that 
is ok.

Regards,
Naresh
> Guenter
>
> > Signed-off-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> > ---
> >   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