From 7bbf842cdcff30ddd1da4ab9059cf92f9d1a4326 Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Tue, 27 Sep 2022 18:53:37 -0400 Subject: counter: interrupt-cnt: Implement watch_validate callback 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 Cc: Pengutronix Kernel Team Link: https://lore.kernel.org/r/20220815225058.144203-1-william.gray@linaro.org/ Signed-off-by: William Breathitt Gray Link: https://lore.kernel.org/r/c50b5eede7d3f523de8dc3937dc44680f2773e1d.1664318353.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/counter/interrupt-cnt.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/counter') diff --git a/drivers/counter/interrupt-cnt.c b/drivers/counter/interrupt-cnt.c index 5a11b65fc0e5..229473855c5b 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) -- cgit 1.4.1