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

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Date:   Mon, 5 Dec 2022 12:37:54 +0530
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Guenter Roeck <linux@...ck-us.net>
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

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@...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
>>