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counter: interrupt-cnt: Implement watch_validate callback

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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@rempel-privat.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Link: https://lore.kernel.org/r/20220815225058.144203-1-william.gray@linaro.org/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/c50b5eede7d3f523de8dc3937dc44680f2773e1d.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
William Breathitt Gray 2022-09-27 18:53:37 -04:00 committed by Greg Kroah-Hartman
parent 3216e5512a
commit 7bbf842cdc
1 changed files with 11 additions and 0 deletions
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11
drivers/counter/interrupt-cnt.c
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@ -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)