The interrupt-cnt counter driver only pushes one type of event on only
one channel: COUNTER_EVENT_CHANGE_OF_STATE on channel 0. The
interrupt_cnt_watch_validate() watch_valid callback is implemented to
ensure watch configurations are valid for this driver.
Cc: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
Signed-off-by: William Breathitt Gray <william.gray@xxxxxxxxxx>
---
drivers/counter/interrupt-cnt.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/counter/interrupt-cnt.c b/drivers/counter/interrupt-cnt.c
index 3b13f56bbb11..05a5d3e2d2b0 100644
--- a/drivers/counter/interrupt-cnt.c
+++ b/drivers/counter/interrupt-cnt.c
@@ -139,12 +139,23 @@ static int interrupt_cnt_signal_read(struct counter_device *counter,
return 0;
}
+static int interrupt_cnt_watch_validate(struct counter_device *counter,
+ const struct counter_watch *watch)
+{
+ if (watch->channel != 0 ||
+ watch->event != COUNTER_EVENT_CHANGE_OF_STATE)
+ return -EINVAL;
+
+ return 0;
+}
+
static const struct counter_ops interrupt_cnt_ops = {
.action_read = interrupt_cnt_action_read,
.count_read = interrupt_cnt_read,
.count_write = interrupt_cnt_write,
.function_read = interrupt_cnt_function_read,
.signal_read = interrupt_cnt_signal_read,
+ .watch_validate = interrupt_cnt_watch_validate,
};
static int interrupt_cnt_probe(struct platform_device *pdev)
base-commit: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
--
2.37.2
