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

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Date:   Tue, 7 Apr 2020 17:56:22 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Jiada Wang <jiada_wang@...tor.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

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.

...
> +	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.