[PATCH v5 1/5] hwmon: (pmbus/core): Add rdev in pmbus_data struct

[PATCH v5 1/5] hwmon: (pmbus/core): Add rdev in pmbus_data struct

[Naresh Solanki]

Add regulator device in pmbus_data & initialize the same during PMBus
regulator register.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>

---
Change in V5:
- Fix error check for rdev
---
 drivers/hwmon/pmbus/pmbus_core.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 95e95783972a..a95f998ca247 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -81,6 +81,7 @@ struct pmbus_label {
 struct pmbus_data {
 	struct device *dev;
 	struct device *hwmon_dev;
+	struct regulator_dev **rdevs;
 
 	u32 flags;		/* from platform data */
 
@@ -3050,9 +3051,13 @@ static int pmbus_regulator_register(struct pmbus_data *data)
 	struct device *dev = data->dev;
 	const struct pmbus_driver_info *info = data->info;
 	const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
-	struct regulator_dev *rdev;
 	int i;
 
+	data->rdevs = devm_kzalloc(dev, sizeof(struct regulator_dev *) * info->num_regulators,
+				  GFP_KERNEL);
+	if (!data->rdevs)
+		return -ENOMEM;
+
 	for (i = 0; i < info->num_regulators; i++) {
 		struct regulator_config config = { };
 
@@ -3062,10 +3067,10 @@ static int pmbus_regulator_register(struct pmbus_data *data)
 		if (pdata && pdata->reg_init_data)
 			config.init_data = &pdata->reg_init_data[i];
 
-		rdev = devm_regulator_register(dev, &info->reg_desc[i],
+		data->rdevs[i] = devm_regulator_register(dev, &info->reg_desc[i],
 					       &config);
-		if (IS_ERR(rdev))
-			return dev_err_probe(dev, PTR_ERR(rdev),
+		if (IS_ERR(data->rdevs[i]))
+			return dev_err_probe(dev, PTR_ERR(data->rdevs[i]),
 					     "Failed to register %s regulator\n",
 					     info->reg_desc[i].name);
 	}

base-commit: 9494c53e1389b120ba461899207ac8a3aab2632c
-- 
2.37.3

[PATCH v5 2/5] hwmon: (pmbus/core): Add interrupt support

[Naresh Solanki]

From: Patrick Rudolph <patrick.rudolph@9elements.com>

Implement PMBUS irq handler.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 drivers/hwmon/pmbus/pmbus.h      |  2 +-
 drivers/hwmon/pmbus/pmbus_core.c | 89 ++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index 10fb17879f8e..6b2e6cf93b19 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -26,7 +26,7 @@ enum pmbus_regs {
 
 	PMBUS_CAPABILITY		= 0x19,
 	PMBUS_QUERY			= 0x1A,
-
+	PMBUS_SMBALERT_MASK		= 0x1B,
 	PMBUS_VOUT_MODE			= 0x20,
 	PMBUS_VOUT_COMMAND		= 0x21,
 	PMBUS_VOUT_TRIM			= 0x22,
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index a95f998ca247..6a3a3fd59b8e 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -3077,11 +3077,94 @@ static int pmbus_regulator_register(struct pmbus_data *data)
 
 	return 0;
 }
+
+static int pmbus_write_smbalert_mask(struct i2c_client *client, u8 page, u8 reg, u8 val)
+{
+	return pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));
+}
+
+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;
+	u8 page;
+
+	for (i = 0; i < data->info->num_regulators; i++) {
+
+		if (!data->rdevs[i])
+			continue;
+
+		page = rdev_get_id(data->rdevs[i]);
+		mutex_lock(&data->update_lock);
+		status = pmbus_read_status_word(client, page);
+		if (status < 0) {
+			mutex_unlock(&data->update_lock);
+			return status;
+		}
+
+		if (status & ~(PB_STATUS_OFF | PB_STATUS_BUSY | PB_STATUS_POWER_GOOD_N))
+			pmbus_clear_fault_page(client, page);
+
+		mutex_unlock(&data->update_lock);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
+{
+	struct device *dev = &client->dev;
+	const struct pmbus_regulator_status_category *cat;
+	const struct pmbus_regulator_status_assoc *bit;
+	int i, j, err, ret, func;
+	u8 mask;
+
+	for (i = 0; i < data->info->pages; i++) {
+		func = data->info->func[i];
+
+		for (j = 0; j < ARRAY_SIZE(pmbus_regulator_flag_map); j++) {
+			cat = &pmbus_regulator_flag_map[j];
+			if (!(func & cat->func))
+				continue;
+			mask = 0;
+			for (bit = cat->bits; bit->pflag; bit++)
+				mask |= bit->pflag;
+
+			err = pmbus_write_smbalert_mask(client, i, cat->reg, ~mask);
+			if (err)
+				dev_err(dev, "Failed to set smbalert for reg 0x%02x\n",	cat->reg);
+		}
+
+		pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_CML, 0xff);
+		pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_OTHER, 0xff);
+		pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_MFR_SPECIFIC, 0xff);
+		if (data->info->func[i] & PMBUS_HAVE_FAN12)
+			pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_FAN_12, 0xff);
+		if (data->info->func[i] & PMBUS_HAVE_FAN34)
+			pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_FAN_34, 0xff);
+	}
+
+	/* Register notifiers - can fail if IRQ is not given */
+	ret = devm_request_threaded_irq(dev, client->irq, NULL, pmbus_fault_handler,
+			      0, "pmbus-irq", data);
+	if (ret) {
+		dev_warn(dev, "IRQ disabled %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 #else
 static int pmbus_regulator_register(struct pmbus_data *data)
 {
 	return 0;
 }
+static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
+{
+	return 0;
+}
 #endif
 
 static struct dentry *pmbus_debugfs_dir;	/* pmbus debugfs directory */
@@ -3446,6 +3529,12 @@ int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
 	if (ret)
 		return ret;
 
+	if (client->irq > 0) {
+		ret = pmbus_irq_setup(client, data);
+		if (ret)
+			return ret;
+	}
+
 	ret = pmbus_init_debugfs(client, data);
 	if (ret)
 		dev_warn(dev, "Failed to register debugfs\n");
-- 
2.37.3

Re: [PATCH v5 2/5] hwmon: (pmbus/core): Add interrupt support

[Guenter Roeck]

On Thu, Dec 01, 2022 at 08:30:21PM +0100, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@9elements.com>
> 
> Implement PMBUS irq handler.
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
> ---
>  drivers/hwmon/pmbus/pmbus.h      |  2 +-
>  drivers/hwmon/pmbus/pmbus_core.c | 89 ++++++++++++++++++++++++++++++++
>  2 files changed, 90 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index 10fb17879f8e..6b2e6cf93b19 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -26,7 +26,7 @@ enum pmbus_regs {
>  
>  	PMBUS_CAPABILITY		= 0x19,
>  	PMBUS_QUERY			= 0x1A,
> -
> +	PMBUS_SMBALERT_MASK		= 0x1B,
>  	PMBUS_VOUT_MODE			= 0x20,
>  	PMBUS_VOUT_COMMAND		= 0x21,
>  	PMBUS_VOUT_TRIM			= 0x22,
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index a95f998ca247..6a3a3fd59b8e 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -3077,11 +3077,94 @@ static int pmbus_regulator_register(struct pmbus_data *data)
>  
>  	return 0;
>  }
> +
> +static int pmbus_write_smbalert_mask(struct i2c_client *client, u8 page, u8 reg, u8 val)
> +{
> +	return pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));
> +}
> +
> +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;
> +	u8 page;
> +
> +	for (i = 0; i < data->info->num_regulators; i++) {

This doesn't take into account situations where there is no regulator.
Remember, regulator support is optional. The entire code still completely
depends on regulator support.

> +
> +		if (!data->rdevs[i])
> +			continue;
> +
> +		page = rdev_get_id(data->rdevs[i]);
> +		mutex_lock(&data->update_lock);
> +		status = pmbus_read_status_word(client, page);
> +		if (status < 0) {
> +			mutex_unlock(&data->update_lock);
> +			return status;
> +		}
> +
> +		if (status & ~(PB_STATUS_OFF | PB_STATUS_BUSY | PB_STATUS_POWER_GOOD_N))
> +			pmbus_clear_fault_page(client, page);
> +
> +		mutex_unlock(&data->update_lock);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
> +{
> +	struct device *dev = &client->dev;
> +	const struct pmbus_regulator_status_category *cat;
> +	const struct pmbus_regulator_status_assoc *bit;
> +	int i, j, err, ret, func;
> +	u8 mask;
> +
> +	for (i = 0; i < data->info->pages; i++) {
> +		func = data->info->func[i];
> +
> +		for (j = 0; j < ARRAY_SIZE(pmbus_regulator_flag_map); j++) {
> +			cat = &pmbus_regulator_flag_map[j];
> +			if (!(func & cat->func))
> +				continue;
> +			mask = 0;
> +			for (bit = cat->bits; bit->pflag; bit++)
> +				mask |= bit->pflag;
> +
> +			err = pmbus_write_smbalert_mask(client, i, cat->reg, ~mask);
> +			if (err)
> +				dev_err(dev, "Failed to set smbalert for reg 0x%02x\n",	cat->reg);
> +		}
> +
> +		pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_CML, 0xff);
> +		pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_OTHER, 0xff);
> +		pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_MFR_SPECIFIC, 0xff);
> +		if (data->info->func[i] & PMBUS_HAVE_FAN12)
> +			pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_FAN_12, 0xff);
> +		if (data->info->func[i] & PMBUS_HAVE_FAN34)
> +			pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_FAN_34, 0xff);
> +	}
> +
> +	/* Register notifiers - can fail if IRQ is not given */
> +	ret = devm_request_threaded_irq(dev, client->irq, NULL, pmbus_fault_handler,
> +			      0, "pmbus-irq", data);
> +	if (ret) {
> +		dev_warn(dev, "IRQ disabled %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  #else
>  static int pmbus_regulator_register(struct pmbus_data *data)
>  {
>  	return 0;
>  }
> +static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
> +{
> +	return 0;
> +}

I understand that you really only care about regulator support,
but this is still unacceptable. Interrupt support is independent of
regulator support and needs to be handled as such.

Guenter

>  #endif
>  
>  static struct dentry *pmbus_debugfs_dir;	/* pmbus debugfs directory */
> @@ -3446,6 +3529,12 @@ int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
>  	if (ret)
>  		return ret;
>  
> +	if (client->irq > 0) {
> +		ret = pmbus_irq_setup(client, data);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	ret = pmbus_init_debugfs(client, data);
>  	if (ret)
>  		dev_warn(dev, "Failed to register debugfs\n");
> -- 
> 2.37.3
> 

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

[Naresh Solanki]

Notify hwmon events using the pmbus irq handler.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.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

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

[Guenter Roeck]

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@9elements.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
> 

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

[Naresh Solanki]

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@9elements.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
>>

[PATCH v5 4/5] hwmon: (pmbus/core): Add regulator event support

[Naresh Solanki]

From: Patrick Rudolph <patrick.rudolph@9elements.com>

Add regulator events corresponding to regulator error in regulator flag
map.
Also capture the same in pmbus_regulator_get_flags.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 85 ++++++++++++++++++++------------
 1 file changed, 54 insertions(+), 31 deletions(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index ad3c0cc884a4..caefcb99aadf 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2739,9 +2739,9 @@ static int pmbus_regulator_disable(struct regulator_dev *rdev)
 	return _pmbus_regulator_on_off(rdev, 0);
 }
 
-/* A PMBus status flag and the corresponding REGULATOR_ERROR_* flag */
+/* A PMBus status flag and the corresponding REGULATOR_ERROR_* and REGULATOR_EVENTS_* flag */
 struct pmbus_regulator_status_assoc {
-	int pflag, rflag;
+	int pflag, rflag, eflag;
 };
 
 /* PMBus->regulator bit mappings for a PMBus status register */
@@ -2756,27 +2756,36 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
 		.func = PMBUS_HAVE_STATUS_VOUT,
 		.reg = PMBUS_STATUS_VOUT,
 		.bits = (const struct pmbus_regulator_status_assoc[]) {
-			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN },
-			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE },
-			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN },
-			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT },
+			{ PB_VOLTAGE_UV_WARNING, REGULATOR_ERROR_UNDER_VOLTAGE_WARN,
+			REGULATOR_EVENT_UNDER_VOLTAGE_WARN },
+			{ PB_VOLTAGE_UV_FAULT,   REGULATOR_ERROR_UNDER_VOLTAGE,
+			REGULATOR_EVENT_UNDER_VOLTAGE },
+			{ PB_VOLTAGE_OV_WARNING, REGULATOR_ERROR_OVER_VOLTAGE_WARN,
+			REGULATOR_EVENT_OVER_VOLTAGE_WARN },
+			{ PB_VOLTAGE_OV_FAULT,   REGULATOR_ERROR_REGULATION_OUT,
+			REGULATOR_EVENT_OVER_VOLTAGE_WARN },
 			{ },
 		},
 	}, {
 		.func = PMBUS_HAVE_STATUS_IOUT,
 		.reg = PMBUS_STATUS_IOUT,
 		.bits = (const struct pmbus_regulator_status_assoc[]) {
-			{ PB_IOUT_OC_WARNING,    REGULATOR_ERROR_OVER_CURRENT_WARN },
-			{ PB_IOUT_OC_FAULT,      REGULATOR_ERROR_OVER_CURRENT },
-			{ PB_IOUT_OC_LV_FAULT,   REGULATOR_ERROR_OVER_CURRENT },
+			{ PB_IOUT_OC_WARNING,   REGULATOR_ERROR_OVER_CURRENT_WARN,
+			REGULATOR_EVENT_OVER_CURRENT_WARN },
+			{ PB_IOUT_OC_FAULT,     REGULATOR_ERROR_OVER_CURRENT,
+			REGULATOR_EVENT_OVER_CURRENT },
+			{ PB_IOUT_OC_LV_FAULT,  REGULATOR_ERROR_OVER_CURRENT,
+			REGULATOR_EVENT_OVER_CURRENT },
 			{ },
 		},
 	}, {
 		.func = PMBUS_HAVE_STATUS_TEMP,
 		.reg = PMBUS_STATUS_TEMPERATURE,
 		.bits = (const struct pmbus_regulator_status_assoc[]) {
-			{ PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN },
-			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP },
+			{ PB_TEMP_OT_WARNING,    REGULATOR_ERROR_OVER_TEMP_WARN,
+			REGULATOR_EVENT_OVER_TEMP_WARN },
+			{ PB_TEMP_OT_FAULT,      REGULATOR_ERROR_OVER_TEMP,
+			REGULATOR_EVENT_OVER_TEMP },
 			{ },
 		},
 	},
@@ -2810,7 +2819,7 @@ static void pmbus_notify(struct pmbus_data *data, int page, int reg, int flags)
 }
 
 static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *error,
-				    bool notify)
+				    unsigned int *event, bool notify)
 {
 	int i, status;
 	const struct pmbus_regulator_status_category *cat;
@@ -2821,7 +2830,8 @@ static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *e
 	u8 page = rdev_get_id(rdev);
 	int func = data->info->func[page];
 
-	*flags = 0;
+	*error = 0;
+	*event = 0;
 
 	mutex_lock(&data->update_lock);
 
@@ -2836,10 +2846,11 @@ static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *e
 			return status;
 		}
 
-		for (bit = cat->bits; bit->pflag; bit++) {
-			if (status & bit->pflag)
-				*flags |= bit->rflag;
-		}
+		for (bit = cat->bits; bit->pflag; bit++)
+			if (status & bit->pflag) {
+				*error |= bit->rflag;
+				*event |= bit->eflag;
+			}
 
 		if (notify && status)
 			pmbus_notify(data, page, cat->reg, status);
@@ -2860,36 +2871,48 @@ static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *e
 		return status;
 
 	if (pmbus_regulator_is_enabled(rdev)) {
-		if (status & PB_STATUS_OFF)
-			*flags |= REGULATOR_ERROR_FAIL;
+		if (status & PB_STATUS_OFF) {
+			*error |= REGULATOR_ERROR_FAIL;
+			*event |= REGULATOR_EVENT_FAIL;
+		}
 
-		if (status & PB_STATUS_POWER_GOOD_N)
-			*flags |= REGULATOR_ERROR_REGULATION_OUT;
+		if (status & PB_STATUS_POWER_GOOD_N) {
+			*error |= REGULATOR_ERROR_REGULATION_OUT;
+			*event |= REGULATOR_EVENT_REGULATION_OUT;
+		}
 	}
 	/*
 	 * Unlike most other status bits, PB_STATUS_{IOUT_OC,VOUT_OV} are
 	 * defined strictly as fault indicators (not warnings).
 	 */
-	if (status & PB_STATUS_IOUT_OC)
-		*flags |= REGULATOR_ERROR_OVER_CURRENT;
-	if (status & PB_STATUS_VOUT_OV)
-		*flags |= REGULATOR_ERROR_REGULATION_OUT;
+	if (status & PB_STATUS_IOUT_OC) {
+		*error |= REGULATOR_ERROR_OVER_CURRENT;
+		*event |= REGULATOR_EVENT_OVER_CURRENT;
+	}
+	if (status & PB_STATUS_VOUT_OV) {
+		*error |= REGULATOR_ERROR_REGULATION_OUT;
+		*event |= REGULATOR_EVENT_FAIL;
+	}
 
 	/*
 	 * If we haven't discovered any thermal faults or warnings via
 	 * PMBUS_STATUS_TEMPERATURE, map PB_STATUS_TEMPERATURE to a warning as
 	 * a (conservative) best-effort interpretation.
 	 */
-	if (!(*flags & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
-	    (status & PB_STATUS_TEMPERATURE))
-		*flags |= REGULATOR_ERROR_OVER_TEMP_WARN;
+	if (!(*error & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
+	    (status & PB_STATUS_TEMPERATURE)) {
+		*error |= REGULATOR_ERROR_OVER_TEMP_WARN;
+		*event |= REGULATOR_EVENT_OVER_TEMP_WARN;
+	}
 
 	return 0;
 }
 
 static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
 {
-	return pmbus_regulator_get_flags(rdev, flags, false);
+	int event;
+
+	return pmbus_regulator_get_flags(rdev, flags, &event, false);
 }
 
 static int pmbus_regulator_get_status(struct regulator_dev *rdev)
@@ -3123,7 +3146,7 @@ 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, ret = IRQ_NONE, status;
+	int i, ret = IRQ_NONE, status, event;
 	u8 page;
 
 	for (i = 0; i < data->info->num_regulators; i++) {
@@ -3131,7 +3154,7 @@ 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);
+		ret = pmbus_regulator_get_flags(data->rdevs[i], &status, &event, true);
 		if (ret)
 			return ret;
 
-- 
2.37.3

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

[Naresh Solanki]

Notify regulator events in PMBus irq handler.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index caefcb99aadf..5241a3c9bd21 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -3158,6 +3158,11 @@ static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
 		if (ret)
 			return ret;
 
+		if (event) {
+			regulator_notifier_call_chain(data->rdevs[i], event, NULL);
+			ret = IRQ_HANDLED;
+		}
+
 		page = rdev_get_id(data->rdevs[i]);
 		mutex_lock(&data->update_lock);
 		status = pmbus_read_status_word(client, page);
-- 
2.37.3

Re: [PATCH v5 1/5] hwmon: (pmbus/core): Add rdev in pmbus_data struct

[Guenter Roeck]

On Thu, Dec 01, 2022 at 08:30:20PM +0100, Naresh Solanki wrote:
> Add regulator device in pmbus_data & initialize the same during PMBus
> regulator register.
> 

This needs an explanation why this change is needed.

Guenter

> Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
> 
> ---
> Change in V5:
> - Fix error check for rdev
> ---
>  drivers/hwmon/pmbus/pmbus_core.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index 95e95783972a..a95f998ca247 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -81,6 +81,7 @@ struct pmbus_label {
>  struct pmbus_data {
>  	struct device *dev;
>  	struct device *hwmon_dev;
> +	struct regulator_dev **rdevs;
>  
>  	u32 flags;		/* from platform data */
>  
> @@ -3050,9 +3051,13 @@ static int pmbus_regulator_register(struct pmbus_data *data)
>  	struct device *dev = data->dev;
>  	const struct pmbus_driver_info *info = data->info;
>  	const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
> -	struct regulator_dev *rdev;
>  	int i;
>  
> +	data->rdevs = devm_kzalloc(dev, sizeof(struct regulator_dev *) * info->num_regulators,
> +				  GFP_KERNEL);
> +	if (!data->rdevs)
> +		return -ENOMEM;
> +
>  	for (i = 0; i < info->num_regulators; i++) {
>  		struct regulator_config config = { };
>  
> @@ -3062,10 +3067,10 @@ static int pmbus_regulator_register(struct pmbus_data *data)
>  		if (pdata && pdata->reg_init_data)
>  			config.init_data = &pdata->reg_init_data[i];
>  
> -		rdev = devm_regulator_register(dev, &info->reg_desc[i],
> +		data->rdevs[i] = devm_regulator_register(dev, &info->reg_desc[i],
>  					       &config);
> -		if (IS_ERR(rdev))
> -			return dev_err_probe(dev, PTR_ERR(rdev),
> +		if (IS_ERR(data->rdevs[i]))
> +			return dev_err_probe(dev, PTR_ERR(data->rdevs[i]),
>  					     "Failed to register %s regulator\n",
>  					     info->reg_desc[i].name);
>  	}
> 
> base-commit: 9494c53e1389b120ba461899207ac8a3aab2632c
> -- 
> 2.37.3
>