On 10/27/2016 05:33 AM, Bastien Nocera wrote:
> 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.
You just want a comment here stating that changes to the firmware should
be made here?
>
>> + 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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