Lenovo Yoga Book 1 (yb1-x90f/l) models have a backlit keyboard where the brightness is directly controlled by one of the Intel Cherry Trail SoCs PWM controllers. To control the backlight the drivers/platform/lenovo-yogabook.c needs to add a pwm_lookup table entry so that it can call pwm_get() to get a reference to the PWM controller. The lenovo-yogabook driver can be build as a module, export pwm_add_table() and pwm_remove_table() so that the lenovo-yogabook driver can use them when build as a module. Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- drivers/pwm/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 474725714a05..c66daac6154f 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -881,6 +881,7 @@ void pwm_add_table(struct pwm_lookup *table, size_t num) mutex_unlock(&pwm_lookup_lock); } +EXPORT_SYMBOL_GPL(pwm_add_table); /** * pwm_remove_table() - unregister PWM device consumers @@ -898,6 +899,7 @@ void pwm_remove_table(struct pwm_lookup *table, size_t num) mutex_unlock(&pwm_lookup_lock); } +EXPORT_SYMBOL_GPL(pwm_remove_table); /** * pwm_get() - look up and request a PWM device -- 2.39.2
