On Thu, 2016-10-20 at 14:59 -0500, Franklin S Cooper Jr wrote:
> Some goodix touchscreen controllers aren't programed properly to
> match the
> display panel it is used on. Although the defaults may largely work
> it is
> also likely that the screen resolution will be incorrect. Therefore,
> add support to allow via DT for the touchscreen resolution to be set
> and
> reprogram the controller to use this updated resolution.
>
> Signed-off-by: Franklin S Cooper Jr <fcooper@xxxxxx>
> ---
> .../bindings/input/touchscreen/goodix.txt | 2 ++
> drivers/input/touchscreen/goodix.c | 26
> +++++++++++++++++++++-
> 2 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git
> a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> index c98757a..ebc7cb7 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> @@ -19,6 +19,8 @@ Optional properties:
> interrupt gpio pin as output to reset the
> device.
> - reset-gpios : GPIO pin used for reset
>
> + - touchscreen-size-x : horizontal resolution of touchscreen
> (in pixels)
> + - touchscreen-size-y : vertical resolution of touchscreen (in
> pixels)
> - touchscreen-inverted-x : X axis is inverted (boolean)
> - touchscreen-inverted-y : Y axis is inverted (boolean)
> - touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
> diff --git a/drivers/input/touchscreen/goodix.c
> b/drivers/input/touchscreen/goodix.c
> index 01e12f8..c2428e1 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -496,6 +496,10 @@ static void goodix_tweak_config(struct
> goodix_ts_data *ts)
> return;
> }
>
> + /* Setting X and Y Resolution */
> + put_unaligned_le16(ts->abs_x_max, &config[RESOLUTION_LOC]);
> + put_unaligned_le16(ts->abs_y_max, &config[RESOLUTION_LOC +
> 2]);
> +
> check_sum = goodix_calculate_checksum(ts->cfg_len, config);
>
> config[raw_cfg_len] = check_sum;
> @@ -669,6 +673,8 @@ static int goodix_request_input_dev(struct
> goodix_ts_data *ts)
> static int goodix_configure_dev(struct goodix_ts_data *ts)
> {
> int error;
> + bool alter_config = false;
> + u32 max_x, max_y;
>
> ts->swapped_x_y = device_property_read_bool(&ts->client-
> >dev,
> "touchscreen-
> swapped-x-y");
> @@ -676,9 +682,27 @@ static int goodix_configure_dev(struct
> goodix_ts_data *ts)
> "touchscreen-
> inverted-x");
> ts->inverted_y = device_property_read_bool(&ts->client->dev,
> "touchscreen-
> inverted-y");
> -
No need for that linefeed removal.
> goodix_read_config(ts);
>
> + if (device_property_present(&ts->client->dev, "touchscreen-
> size-x") &&
Is it expected that incomplete or invalid arguments do not generate
errors? I'd expect that the presence of just one of those properties,
or...
> + device_property_present(&ts->client->dev, "touchscreen-
> size-y")) {
> +
> + device_property_read_u32(&ts->client->dev,
> "touchscreen-size-x",
> + &max_x);
> +
> + device_property_read_u32(&ts->client->dev,
> "touchscreen-size-y",
> + &max_y);
> +
> + if (max_x > 0 && max_y > 0) {
... invalid values for those properties would throw errors (either
warnings, or lower severity messages).
> + ts->abs_x_max = max_x;
> + ts->abs_y_max = max_y;
> + alter_config = true;
> + }
> + }
> +
> + if (alter_config)
> + goodix_tweak_config(ts);
> +
> error = goodix_request_input_dev(ts);
> if (error)
> return error;
--
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