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Message-ID: <a40d32e5-f310-b485-d789-1d99a547e3e8@gmail.com>
Date:   Mon, 28 Nov 2022 01:18:11 -0800
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Subject: Re: [PATCH V2 1/3] Input: elantech - Remove redundant field
 elantech_data::y_max
To:     Mattijs Korpershoek <mkorpershoek@baylibre.com>,
        linux-input@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org
References: <20221014111533.908-1-nyanpasu256@gmail.com>
 <20221014111533.908-2-nyanpasu256@gmail.com> <87sfjqzh3f.fsf@baylibre.com>
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From:   Eirin Nya <nyanpasu256@gmail.com>
In-Reply-To: <87sfjqzh3f.fsf@baylibre.com>
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Hi,

Is there any progress on incorporating this patch into mainline Linux?
Every time my rolling distro updates its kernel minor/patch version, I
get a broken touchpad until I rebase and reapply my patch, then
rebuild and install the psmouse kernel module. I've had to do this so
many times I wrote a script to automate this process for new kernel
patch versions (and have to fix the script for new minor/major
versions since I didn't figure out string parsing in Bash, or if I
switched Linux distros).

Thanks,
Eirin

On 10/14/22 6:10 AM, Mattijs Korpershoek wrote:
> On Fri, Oct 14, 2022 at 04:15, Eirin Nya <nyanpasu256@gmail.com> wrote:
> 
>> elantech_data::y_max is copied from elantech_device_info::y_max, and
>> neither is mutated after initialization. So remove the redundant
>> variable to prevent future bugs when updating y_max.
>>
>> Signed-off-by: Eirin Nya <nyanpasu256@gmail.com>
> 
> Hi Eirin,
> 
> Thank you for v2. I know you're new to kernel development so here is
> some more "process feedback".
> 
> I've already reviewed this in v1:
> https://lore.kernel.org/all/87ilkv7ogc.fsf@mkorpershoek-xps-13-9370.home/
> 
> After getting a "Reviewed-by" reply on one of the patches, it is
> customary to add that in the commit message footer, if the patch is
> unchanged. This encourages reviewers and gives them some credit for
> their review :)
> 
> This is documented at:
> https://www.kernel.org/doc/html/latest/process/submitting-patches.html#reviewer-s-statement-of-oversight
> 
> To quote the doc:
>> Both Tested-by and Reviewed-by tags, once received on mailing list from
>> tester or reviewer, should be added by author to the applicable patches
>> when sending next versions.
> 
> So please, if you have to send a v3 at some point, please add:
> 
> Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
> 
> Note that it's not needed to send a v3 *JUST* to include the trailers.
> The maintainer will pick them up if he decides to merge this.
> 
>> ---
>>  drivers/input/mouse/elantech.c | 17 ++++++++---------
>>  drivers/input/mouse/elantech.h |  1 -
>>  2 files changed, 8 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
>> index ece97f8c6a..79e31611fc 100644
>> --- a/drivers/input/mouse/elantech.c
>> +++ b/drivers/input/mouse/elantech.c
>> @@ -360,7 +360,7 @@ static void elantech_report_absolute_v1(struct psmouse *psmouse)
>>  		input_report_abs(dev, ABS_X,
>>  			((packet[1] & 0x0c) << 6) | packet[2]);
>>  		input_report_abs(dev, ABS_Y,
>> -			etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
>> +			etd->info.y_max - (((packet[1] & 0x03) << 8) | packet[3]));
>>  	}
>>  
>>  	input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
>> @@ -435,7 +435,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
>>  		 * byte 4:  .   .   .   .  y11 y10 y9  y8
>>  		 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
>>  		 */
>> -		y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>> +		y1 = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>>  
>>  		pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
>>  		width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
>> @@ -450,7 +450,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
>>  		 */
>>  		x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
>>  		/* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
>> -		y1 = etd->y_max -
>> +		y1 = etd->info.y_max -
>>  			((((packet[0] & 0x20) << 3) | packet[2]) << 2);
>>  		/*
>>  		 * byte 3:  .   .  by8 bx8  .   .   .   .
>> @@ -458,7 +458,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
>>  		 */
>>  		x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
>>  		/* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
>> -		y2 = etd->y_max -
>> +		y2 = etd->info.y_max -
>>  			((((packet[3] & 0x20) << 3) | packet[5]) << 2);
>>  
>>  		/* Unknown so just report sensible values */
>> @@ -579,7 +579,7 @@ static void elantech_report_absolute_v3(struct psmouse *psmouse,
>>  		 * byte 4:  .   .   .   .  y11 y10 y9  y8
>>  		 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
>>  		 */
>> -		y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>> +		y1 = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>>  		break;
>>  
>>  	case 2:
>> @@ -593,7 +593,7 @@ static void elantech_report_absolute_v3(struct psmouse *psmouse,
>>  			 * byte 4:   .    .    .    .  ay11 ay10 ay9  ay8
>>  			 * byte 5: ay7  ay6  ay5  ay4  ay3  ay2  ay1  ay0
>>  			 */
>> -			etd->mt[0].y = etd->y_max -
>> +			etd->mt[0].y = etd->info.y_max -
>>  				(((packet[4] & 0x0f) << 8) | packet[5]);
>>  			/*
>>  			 * wait for next packet
>> @@ -605,7 +605,7 @@ static void elantech_report_absolute_v3(struct psmouse *psmouse,
>>  		x1 = etd->mt[0].x;
>>  		y1 = etd->mt[0].y;
>>  		x2 = ((packet[1] & 0x0f) << 8) | packet[2];
>> -		y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>> +		y2 = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>>  		break;
>>  	}
>>  
>> @@ -681,7 +681,7 @@ static void process_packet_head_v4(struct psmouse *psmouse)
>>  		return;
>>  
>>  	etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
>> -	etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>> +	etd->mt[id].y = etd->info.y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
>>  	pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
>>  	traces = (packet[0] & 0xf0) >> 4;
>>  
>> @@ -1253,7 +1253,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>>  		input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res);
>>  	}
>>  
>> -	etd->y_max = y_max;
>>  	etd->width = width;
>>  
>>  	return 0;
>> diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
>> index 571e6ca11d..1ec004f72d 100644
>> --- a/drivers/input/mouse/elantech.h
>> +++ b/drivers/input/mouse/elantech.h
>> @@ -180,7 +180,6 @@ struct elantech_data {
>>  	unsigned char reg_25;
>>  	unsigned char reg_26;
>>  	unsigned int single_finger_reports;
>> -	unsigned int y_max;
>>  	unsigned int width;
>>  	struct finger_pos mt[ETP_MAX_FINGERS];
>>  	unsigned char parity[256];
>> -- 
>> 2.38.0