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authorMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>2021-11-24 10:17:13 +0300
committerMark Brown <broonie@kernel.org>2021-11-24 15:57:30 +0300
commita764ff77d697a4a13e69b3379cc613f7409c6b9a (patch)
tree85c15bedf4737a4b60e18a9d86438d5f2f999c4a /drivers/regulator
parent6fadec4c5561e2fbe1dfa8a7da9bc58d094a8f04 (diff)
downloadlinux-a764ff77d697a4a13e69b3379cc613f7409c6b9a.tar.xz
regulator: irq_helper: Provide helper for trivial IRQ notifications
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>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/irq_helpers.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/regulator/irq_helpers.c b/drivers/regulator/irq_helpers.c
index 522764435575..fe7ae0f3f46a 100644
--- a/drivers/regulator/irq_helpers.c
+++ b/drivers/regulator/irq_helpers.c
@@ -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);
+