Commit 9830288a authored by William Breathitt Gray's avatar William Breathitt Gray Committed by Greg Kroah-Hartman
Browse files

counter: 104-quad-8: Add Signal polarity component 

The 104-quad-8 driver provides support for Index signal polarity modes
via the "index_polarity" Signal component. This patch exposes the same
functionality through the more standard "polarity" Signal component.

Link: https://lore.kernel.org/r/01d00c21873159833035cb6775d0d0e8ad55f2ef.1664204990.git.william.gray@linaro.org/


Signed-off-by: default avatarWilliam Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/0bf840beee1665e9f04ea82368ecdde87c791a22.1664318353.git.william.gray@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 650ae67b

drivers/counter/104-quad-8.c

+35 −0
Original line number Diff line number Diff line
@@ -549,6 +549,32 @@ static int quad8_index_polarity_set(struct counter_device *counter, 
	return 0;

}



static int quad8_polarity_read(struct counter_device *counter,

			       struct counter_signal *signal,

			       enum counter_signal_polarity *polarity)

{

	int err;

	u32 index_polarity;



	err = quad8_index_polarity_get(counter, signal, &index_polarity);

	if (err)

		return err;



	*polarity = (index_polarity) ? COUNTER_SIGNAL_POLARITY_POSITIVE :

		COUNTER_SIGNAL_POLARITY_NEGATIVE;



	return 0;

}



static int quad8_polarity_write(struct counter_device *counter,

				struct counter_signal *signal,

				enum counter_signal_polarity polarity)

{

	const u32 pol = (polarity == COUNTER_SIGNAL_POLARITY_POSITIVE) ? 1 : 0;



	return quad8_index_polarity_set(counter, signal, pol);

}



static const char *const quad8_synchronous_modes[] = {

	"non-synchronous",

	"synchronous"
@@ -977,6 +1003,13 @@ static struct counter_comp quad8_signal_ext[] = { 
			       quad8_signal_fck_prescaler_write)

};



static const enum counter_signal_polarity quad8_polarities[] = {

	COUNTER_SIGNAL_POLARITY_POSITIVE,

	COUNTER_SIGNAL_POLARITY_NEGATIVE,

};



static DEFINE_COUNTER_AVAILABLE(quad8_polarity_available, quad8_polarities);



static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes);

static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes);
@@ -984,6 +1017,8 @@ static struct counter_comp quad8_index_ext[] = { 
	COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get,

				 quad8_index_polarity_set,

				 quad8_index_pol_enum),

	COUNTER_COMP_POLARITY(quad8_polarity_read, quad8_polarity_write,

			      quad8_polarity_available),

	COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get,

				 quad8_synchronous_mode_set,

				 quad8_synch_mode_enum),