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Subject[PATCH RESEND v6 2/5] hwmon: (pmbus/core): Notify hwmon events
Date
Notify hwmon events using the pmbus irq handler.

Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
drivers/hwmon/pmbus/pmbus_core.c | 95 ++++++++++++++++++++++++--------
1 file changed, 72 insertions(+), 23 deletions(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 244fd2597252..b005a1c8ad7e 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2781,18 +2781,43 @@ 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_get_flags(struct pmbus_data *data, u8 page, unsigned int *error,
+ bool notify)
{
- int i, status;
const struct pmbus_regulator_status_category *cat;
const struct pmbus_regulator_status_assoc *bit;
- struct device *dev = rdev_get_dev(rdev);
- struct i2c_client *client = to_i2c_client(dev->parent);
- struct pmbus_data *data = i2c_get_clientdata(client);
- u8 page = rdev_get_id(rdev);
+ struct i2c_client *client = to_i2c_client(data->dev);
int func = data->info->func[page];
+ int i, status, ret;

- *flags = 0;
+ *error = 0;

mutex_lock(&data->update_lock);

@@ -2803,14 +2828,17 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned

status = _pmbus_read_byte_data(client, page, cat->reg);
if (status < 0) {
- mutex_unlock(&data->update_lock);
- return status;
+ ret = status;
+ goto unlock;
}

for (bit = cat->bits; bit->pflag; bit++) {
if (status & bit->pflag)
- *flags |= bit->rflag;
+ *error |= bit->rflag;
}
+
+ if (notify && status)
+ pmbus_notify(data, page, cat->reg, status);
}

/*
@@ -2823,36 +2851,53 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
* REGULATOR_ERROR_<foo>_WARN.
*/
status = pmbus_get_status(client, page, PMBUS_STATUS_WORD);
- mutex_unlock(&data->update_lock);
- if (status < 0)
- return status;

- if (pmbus_regulator_is_enabled(rdev)) {
+ if (status < 0) {
+ ret = status;
+ goto unlock;
+ }
+
+ ret = _pmbus_read_byte_data(client, page, PMBUS_OPERATION);
+ if (ret < 0)
+ goto unlock;
+
+ if (ret & PB_OPERATION_CONTROL_ON) {
if (status & PB_STATUS_OFF)
- *flags |= REGULATOR_ERROR_FAIL;
+ *error |= REGULATOR_ERROR_FAIL;

if (status & PB_STATUS_POWER_GOOD_N)
- *flags |= REGULATOR_ERROR_REGULATION_OUT;
+ *error |= REGULATOR_ERROR_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;
+ *error |= REGULATOR_ERROR_OVER_CURRENT;
if (status & PB_STATUS_VOUT_OV)
- *flags |= REGULATOR_ERROR_REGULATION_OUT;
+ *error |= REGULATOR_ERROR_REGULATION_OUT;

/*
* 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)) &&
+ if (!(*error & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
(status & PB_STATUS_TEMPERATURE))
- *flags |= REGULATOR_ERROR_OVER_TEMP_WARN;
+ *error |= REGULATOR_ERROR_OVER_TEMP_WARN;

- return 0;
+unlock:
+ mutex_unlock(&data->update_lock);
+ return ret;
+}
+
+static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+{
+ struct device *dev = rdev_get_dev(rdev);
+ 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, false);
}

static int pmbus_regulator_get_status(struct regulator_dev *rdev)
@@ -3082,10 +3127,14 @@ 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;

for (i = 0; i < data->info->pages; i++) {

+ ret = pmbus_get_flags(data, i, &status, true);
+ if (ret)
+ return ret;
+
mutex_lock(&data->update_lock);
status = pmbus_read_status_word(client, i);
if (status < 0) {
@@ -3099,7 +3148,7 @@ 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
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