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regulator: irq_helper: Provide helper for trivial IRQ notifications

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Provide a generic map_event helper for regulators which have a notification
IRQ with single, well defined purpose. Eg, IRQ always indicates exactly one
event for exactly one regulator device. For such IRQs the mapping is
trivial.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/603b7ed1938013a00371c1e7ccc63dfb16982b87.1637736436.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Matti Vaittinen 2021-11-24 09:17:13 +02:00 committed by Mark Brown
parent 6fadec4c55
commit a764ff77d6
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2 changed files with 42 additions and 1 deletions
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41
drivers/regulator/irq_helpers.c
View file

@ -320,7 +320,9 @@ static void init_rdev_errors(struct regulator_irq *h)
* IRQF_ONESHOT when requesting the (threaded) irq.
* @common_errs: Errors which can be flagged by this IRQ for all rdevs.
* When IRQ is re-enabled these errors will be cleared
* from all associated regulators
* from all associated regulators. Use this instead of the
* per_rdev_errs if you use
* regulator_irq_map_event_simple() for event mapping.
* @per_rdev_errs: Optional error flag array describing errors specific
* for only some of the regulators. These errors will be
* or'ed with common errors. If this is given the array
@ -395,3 +397,40 @@ void regulator_irq_helper_cancel(void **handle)
}
}
EXPORT_SYMBOL_GPL(regulator_irq_helper_cancel);
/**
* regulator_irq_map_event_simple - regulator IRQ notification for trivial IRQs
*
* @irq: Number of IRQ that occurred
* @rid: Information about the event IRQ indicates
* @dev_mask: mask indicating the regulator originating the IRQ
*
* Regulators whose IRQ has single, well defined purpose (always indicate
* exactly one event, and are relevant to exactly one regulator device) can
* use this function as their map_event callbac for their regulator IRQ
* notification helperk. Exactly one rdev and exactly one error (in
* "common_errs"-field) can be given at IRQ helper registration for
* regulator_irq_map_event_simple() to be viable.
*/
int regulator_irq_map_event_simple(int irq, struct regulator_irq_data *rid,
unsigned long *dev_mask)
{
int err = rid->states[0].possible_errs;
*dev_mask = 1;
/*
* This helper should only be used in a situation where the IRQ
* can indicate only one type of problem for one specific rdev.
* Something fishy is going on if we are having multiple rdevs or ERROR
* flags here.
*/
if (WARN_ON(rid->num_states != 1 || hweight32(err) != 1))
return 0;
rid->states[0].errors = err;
rid->states[0].notifs = regulator_err2notif(err);
return 0;
}
EXPORT_SYMBOL_GPL(regulator_irq_map_event_simple);

2
include/linux/regulator/driver.h
View file

@ -700,6 +700,8 @@ void *regulator_irq_helper(struct device *dev,
int irq_flags, int common_errs, int *per_rdev_errs,
struct regulator_dev **rdev, int rdev_amount);
void regulator_irq_helper_cancel(void **handle);
int regulator_irq_map_event_simple(int irq, struct regulator_irq_data *rid,
unsigned long *dev_mask);
void *rdev_get_drvdata(struct regulator_dev *rdev);
struct device *rdev_get_dev(struct regulator_dev *rdev);