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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2016-07-27 14:36:26 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2016-07-27 18:26:10 -0700 |
| commit | d205a2185938e38c8667405dc44cd6221c71682e (patch) | |
| tree | aa63808e9391f23d9c722b00ed25a411509dc91a /drivers/input | |
| parent | f712a5a05228058f6b74635546549d4a46e117fc (diff) | |
| download | blackbird-obmc-linux-d205a2185938e38c8667405dc44cd6221c71682e.tar.gz blackbird-obmc-linux-d205a2185938e38c8667405dc44cd6221c71682e.zip | |
Input: rotary_encoder - support binary encoding of states
It's not advisable to use this encoding, but to support existing devices
add support for this to the driver.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/misc/rotary_encoder.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c index c7fc8d4fb080..1588aecafff7 100644 --- a/drivers/input/misc/rotary_encoder.c +++ b/drivers/input/misc/rotary_encoder.c @@ -28,6 +28,11 @@ #define DRV_NAME "rotary-encoder" +enum rotary_encoder_encoding { + ROTENC_GRAY, + ROTENC_BINARY, +}; + struct rotary_encoder { struct input_dev *input; @@ -37,6 +42,7 @@ struct rotary_encoder { u32 axis; bool relative_axis; bool rollover; + enum rotary_encoder_encoding encoding; unsigned int pos; @@ -57,8 +63,9 @@ static unsigned int rotary_encoder_get_state(struct rotary_encoder *encoder) 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; @@ -213,6 +220,20 @@ static int rotary_encoder_probe(struct platform_device *pdev) 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"); |
