On Thu, 2016-10-20 at 14:59 -0500, Franklin S Cooper Jr wrote:
> Some goodix touchscreen controllers don't have the correct
> configuration
> firmware for the display panel it is attached to. Therefore, settings
> such
> as touchscreen x and y size may need to be passed in via DT and have
> the
> panel reprogrammed for the updated touchscreen resolution.
>
> This patchset adds support for reading the current configuration
> firmware
> on the panel and allowing it to be modified and rewritten back to the
> device.
>
> Currently this function is unused but later patches will make use of
> it.
>
> Signed-off-by: Franklin S Cooper Jr <fcooper@xxxxxx>
> ---
> drivers/input/touchscreen/goodix.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/drivers/input/touchscreen/goodix.c
> b/drivers/input/touchscreen/goodix.c
> index a43c8ca..01e12f8 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -478,6 +478,34 @@ static int goodix_get_gpio_config(struct
> goodix_ts_data *ts)
> return 0;
> }
>
> +static void goodix_tweak_config(struct goodix_ts_data *ts)
> +{
> + u8 config[GOODIX_CONFIG_MAX_LENGTH];
> + int error;
> + int raw_cfg_len;
> + u8 check_sum = 0;
> +
> + raw_cfg_len = ts->cfg_len - 2;
> +
> + error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
> + config, ts->cfg_len);
> + if (error) {
> + dev_warn(&ts->client->dev,
> + "Error reading config (%d), avoid tweaking
> config\n",
> + error);
> + return;
> + }
Please add a placeholder comment here, to go along with the commit
message explanation.
> + check_sum = goodix_calculate_checksum(ts->cfg_len, config);
> +
> + config[raw_cfg_len] = check_sum;
> + config[raw_cfg_len + 1] = 1;
> +
> + error = goodix_send_cfg(ts, ts->cfg_len, config);
> + if (error)
> + dev_warn(&ts->client->dev,
> + "Error writing config (%d)\n", error);
> +}
> /**
> * goodix_read_config - Read the embedded configuration of the panel
> *
--
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