#define DRV_NAME "rotary-encoder"
+enum rotary_encoder_encoding {
+ ROTENC_GRAY,
+ ROTENC_BINARY,
+};
+
struct rotary_encoder {
struct input_dev *input;
u32 axis;
bool relative_axis;
bool rollover;
+ enum rotary_encoder_encoding encoding;
unsigned int pos;
for (i = 0; i < encoder->gpios->ndescs; ++i) {
int val = gpiod_get_value_cansleep(encoder->gpios->desc[i]);
+
/* convert from gray encoding to normal */
- if (ret & 1)
+ if (encoder->encoding == ROTENC_GRAY && ret & 1)
val = !val;
ret = ret << 1 | val;
encoder->rollover =
device_property_read_bool(dev, "rotary-encoder,rollover");
+ if (!device_property_present(dev, "rotary-encoder,encoding") ||
+ !device_property_match_string(dev, "rotary-encoder,encoding",
+ "gray")) {
+ dev_info(dev, "gray");
+ encoder->encoding = ROTENC_GRAY;
+ } else if (!device_property_match_string(dev, "rotary-encoder,encoding",
+ "binary")) {
+ dev_info(dev, "binary");
+ encoder->encoding = ROTENC_BINARY;
+ } else {
+ dev_err(dev, "unknown encoding setting\n");
+ return -EINVAL;
+ }
+
device_property_read_u32(dev, "linux,axis", &encoder->axis);
encoder->relative_axis =
device_property_read_bool(dev, "rotary-encoder,relative-axis");