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| author |   William Breathitt Gray <william.gray@linaro.org> | 2022-09-27 18:53:37 -0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-30 14:32:35 +0200 |
| commit | 7bbf842cdcff30ddd1da4ab9059cf92f9d1a4326 (patch) | |
| tree | f4a449399ce9106a041dcbed9c7f200534ea2ca7 /drivers/counter | |
| parent | counter: Move symbols into COUNTER namespace (diff) | |
| download | wireguard-linux-7bbf842cdcff30ddd1da4ab9059cf92f9d1a4326.tar.xz wireguard-linux-7bbf842cdcff30ddd1da4ab9059cf92f9d1a4326.zip | |
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 <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>
Diffstat (limited to 'drivers/counter')
| -rw-r--r-- | drivers/counter/interrupt-cnt.c | 11 |
1 files changed, 11 insertions, 0 deletions
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) |