linux-kernel - Re: [PATCH v10 20/55] Input: atmel_mxt_ts - handle cfg filename via pdata/sysfs

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Date:   Thu, 9 Apr 2020 18:11:35 +0900
From:   "Wang, Jiada" <jiada_wang@...tor.com>
To:     Dmitry Osipenko <digetx@...il.com>, <nick@...anahar.org>,
        <dmitry.torokhov@...il.com>, <jikos@...nel.org>,
        <benjamin.tissoires@...hat.com>, <bsz@...ihalf.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <erosca@...adit-jv.com>, <Andrew_Gabbasov@...tor.com>
Subject: Re: [PATCH v10 20/55] Input: atmel_mxt_ts - handle cfg filename via
 pdata/sysfs

Hi Dmitrij

On 2020/04/07 23:56, Dmitry Osipenko wrote:
> 31.03.2020 13:50, Jiada Wang пишет:
>> From: Nick Dyer <nick.dyer@...ev.co.uk>
>>
>> There may be multiple maXTouch chips on a single device which will require
>> different configuration files. Add a platform data value for the
>> configuration filename.
>>
>> Add sysfs entry to write configuration file if the platform data is not
>> set.
>>
>> Split out the object initialisation code from mxt_initialize() into
>> mxt_configure_objects() to allow this.
>>
>> Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
>> Acked-by: Yufeng Shen <miletus@...omium.org>
>> (cherry picked from ndyer/linux/for-upstream commit 71a2a4d1954460b949a16b607f72bafab294ca79)
>> [gdavis: Resolve forward port conflicts due to applying upstream
>> 	 commit 96a938aa214e ("Input: atmel_mxt_ts - remove platform
>> 	 data support").]
>> Signed-off-by: George G. Davis <george_davis@...tor.com>
>> [gdavis: Squash fix from Vladimir Zapolskiy:
>> 	 - Input: atmel_mxt_ts - fix error paths in mxt_configure_objects()]
>> Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
>> [jiada: Separate Documentation/ portion change to another commit
>> 	Rename mxt_update_cfg_store to update_cfg_store
>> 	Replace DEVICE_ATTR with DEVICE_ATTR_WO]
>> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
>> ---
>>   drivers/input/touchscreen/atmel_mxt_ts.c | 109 +++++++++++++++++++----
>>   1 file changed, 94 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
>> index 720574417219..d1865250f492 100644
>> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
>> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
>> @@ -34,7 +34,6 @@
>>   #include <dt-bindings/input/atmel_mxt_ts.h>
>>   
>>   /* Configuration file */
>> -#define MXT_CFG_NAME		"maxtouch.cfg"
>>   #define MXT_CFG_MAGIC		"OBP_RAW V1"
> ...
> 
>>   static void mxt_input_sync(struct mxt_data *data)
>>   {
>> -	input_mt_report_pointer_emulation(data->input_dev,
>> -					  data->t19_num_keys);
>> -	input_sync(data->input_dev);
>> +	if (data->input_dev) {
>> +		input_mt_report_pointer_emulation(data->input_dev,
>> +						  data->t19_num_keys);
>> +		input_sync(data->input_dev);
>> +	}
>>   }
> 
> Looks like this hunk shouldn't belong to this patch.
yes, this part of change
squash fix from ndyer/linux/for-upstream commit 
c909ada856861f305653b127db3ea0fa60264331
- Input: atmel_mxt_ts - check data->input_dev is not null in 
mxt_input_sync()
seems due to some mistake, commit description about the squash,
start to be missing from v6 patch-set

I will separate it back into a single commit
> 
> ...
>> +	if (data->pcfg_name)
>> +		mxt_update_file_name(&data->client->dev,
>> +				     &data->cfg_name,
>> +				     data->pcfg_name,
>> +				     strlen(data->pcfg_name));
> 
> This looks wrong to me because I think the cfg_name should fall back to
> "maxtouch.cfg" if atmel,cfg_name isn't specified in device-tree,
> otherwise this commit may break devices that use an older device-tree.
> 
I agree with you, in next version,
I will update this patch to also be compatible with legacy cfg name 
"maxtouch.cfg"

Thanks,
Jiada