[PATCH 1/2] Input: rotary_encoder - Support key events

[Donghoon Han]

From: Steven Han <nazgu...@gmail.com>

Support generating EV_KEY pair, instead of EV_REL.

Signed-off-by: Donghoon Han <nazgu...@gmail.com>
---
 drivers/input/misc/rotary_encoder.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/input/misc/rotary_encoder.c 
b/drivers/input/misc/rotary_encoder.c
index 72eee6d55527..180e35884289 100644
--- a/drivers/input/misc/rotary_encoder.c
+++ b/drivers/input/misc/rotary_encoder.c
@@ -41,6 +41,8 @@ struct rotary_encoder {
        u32 steps;
        u32 axis;
        bool relative_axis;
+       bool relative_keys;
+       u32 keycodes[2];
        bool rollover;
        enum rotary_encoder_encoding encoding;
 
@@ -79,6 +81,10 @@ static void rotary_encoder_report_event(struct 
rotary_encoder *encoder)
        if (encoder->relative_axis) {
                input_report_rel(encoder->input,
                                 encoder->axis, encoder->dir);
+       } else if (encoder->relative_keys) {
+               u32 keycode = encoder->keycodes[encoder->dir > 0];
+               input_event(encoder->input, EV_KEY, keycode, 1);
+               input_event(encoder->input, EV_KEY, keycode, 0);
        } else {
                unsigned int pos = encoder->pos;
 
@@ -237,6 +243,16 @@ static int rotary_encoder_probe(struct platform_device 
*pdev)
        device_property_read_u32(dev, "linux,axis", &encoder->axis);
        encoder->relative_axis =
                device_property_read_bool(dev, "rotary-encoder,relative-axis");
+       encoder->relative_keys =
+               device_property_read_bool(dev, "rotary-encoder,relative-keys");
+       if (encoder->relative_keys) {
+               err = device_property_read_u32_array(dev,
+                                       "rotary-encoder,relative-keycodes",
+                                       encoder->keycodes, 2);
+               if (err)
+                       dev_err(dev, "unable to get keycodes: %d\n", err);
+               return err;
+       }
 
        encoder->gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN);
        if (IS_ERR(encoder->gpios)) {
@@ -260,9 +276,12 @@ static int rotary_encoder_probe(struct platform_device 
*pdev)
        input->id.bustype = BUS_HOST;
        input->dev.parent = dev;
 
-       if (encoder->relative_axis)
+       if (encoder->relative_axis) {
                input_set_capability(input, EV_REL, encoder->axis);
-       else
+       } else if (encoder->relative_keys) {
+               input_set_capability(input, EV_KEY, encoder->keycodes[0]);
+               input_set_capability(input, EV_KEY, encoder->keycodes[1]);
+       } else
                input_set_abs_params(input,
                                     encoder->axis, 0, encoder->steps, 0, 1);
 
-- 
2.17.1