| Message ID | 20210401153228.2773560-1-jarkko.nikula@linux.intel.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [1/2] counter: Add support for Quadrature x4 with swapped inputs | expand |
On Thu, Apr 01, 2021 at 06:32:27PM +0300, Jarkko Nikula wrote: > Some Quadrature Encoders can swap phase inputs A and B internally. This > new function will allow drivers to configure input swap mode. > > This was implemented by Felipe Balbi while he was working at Intel. > > Signed-off-by: Felipe Balbi (Intel) <balbi@kernel.org> > Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> > --- > Documentation/ABI/testing/sysfs-bus-counter | 4 ++++ > drivers/counter/counter.c | 3 ++- > include/linux/counter.h | 3 ++- > 3 files changed, 8 insertions(+), 2 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter > index 566bd99fe0a5..8f1e3de88c77 100644 > --- a/Documentation/ABI/testing/sysfs-bus-counter > +++ b/Documentation/ABI/testing/sysfs-bus-counter > @@ -146,6 +146,10 @@ Description: > updates the respective count. Quadrature encoding > determines the direction. > > + quadrature x4 swapped: > + Same as quadrature x4, however Phase A and Phase B > + signals are swapped. > + > What: /sys/bus/counter/devices/counterX/countY/name > KernelVersion: 5.2 > Contact: linux-iio@vger.kernel.org > diff --git a/drivers/counter/counter.c b/drivers/counter/counter.c > index 6a683d086008..11d357245b14 100644 > --- a/drivers/counter/counter.c > +++ b/drivers/counter/counter.c > @@ -752,7 +752,8 @@ static const char *const counter_count_function_str[] = { > [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b", > [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a", > [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b", > - [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4" > + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4", > + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4_SWAPPED] = "quadrature x4 swapped" > }; > > static ssize_t counter_function_show(struct device *dev, > diff --git a/include/linux/counter.h b/include/linux/counter.h > index 9dbd5df4cd34..c3b4d263eb22 100644 > --- a/include/linux/counter.h > +++ b/include/linux/counter.h > @@ -170,7 +170,8 @@ enum counter_count_function { > COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B, > COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A, > COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B, > - COUNTER_COUNT_FUNCTION_QUADRATURE_X4 > + COUNTER_COUNT_FUNCTION_QUADRATURE_X4, > + COUNTER_COUNT_FUNCTION_QUADRATURE_X4_SWAPPED, > }; > > /** > -- > 2.30.2 >
diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter index 566bd99fe0a5..8f1e3de88c77 100644 --- a/Documentation/ABI/testing/sysfs-bus-counter +++ b/Documentation/ABI/testing/sysfs-bus-counter @@ -146,6 +146,10 @@ Description: updates the respective count. Quadrature encoding determines the direction. + quadrature x4 swapped: + Same as quadrature x4, however Phase A and Phase B + signals are swapped. + What: /sys/bus/counter/devices/counterX/countY/name KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org diff --git a/drivers/counter/counter.c b/drivers/counter/counter.c index 6a683d086008..11d357245b14 100644 --- a/drivers/counter/counter.c +++ b/drivers/counter/counter.c @@ -752,7 +752,8 @@ static const char *const counter_count_function_str[] = { [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b", [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a", [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b", - [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4" + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4", + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4_SWAPPED] = "quadrature x4 swapped" }; static ssize_t counter_function_show(struct device *dev, diff --git a/include/linux/counter.h b/include/linux/counter.h index 9dbd5df4cd34..c3b4d263eb22 100644 --- a/include/linux/counter.h +++ b/include/linux/counter.h @@ -170,7 +170,8 @@ enum counter_count_function { COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B, COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A, COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B, - COUNTER_COUNT_FUNCTION_QUADRATURE_X4 + COUNTER_COUNT_FUNCTION_QUADRATURE_X4, + COUNTER_COUNT_FUNCTION_QUADRATURE_X4_SWAPPED, }; /**