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From: Chase Douglas <chase.douglas@canonical.com>
To: Henrik Rydberg <rydberg@euromail.se>
Cc: Daniel Kurtz <djkurtz@chromium.org>,
	dmitry.torokhov@gmail.com, rubini@cvml.unipv.it,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	derek.foreman@collabora.co.uk, daniel.stone@collabora.co.uk,
	olofj@chromium.org
Subject: Re: [PATCH 05/12] Input: synaptics - process button bits in AGM packets
Date: Tue, 05 Jul 2011 11:19:55 -0700	[thread overview]
Message-ID: <4E1355CB.9070504@canonical.com> (raw)
In-Reply-To: <20110705181843.GA29296@polaris.bitmath.org>

On 07/05/2011 11:18 AM, Henrik Rydberg wrote:
>>> Any particular reason to move these and leave them unassigned for clickpads?
>>
>> Yes.  The current implementation incorrectly parses the x, y, z of AGM
>> packets and assigns junk values to the corresponding fields of the
>> temporary hw struct.  Luckily, this struct is then just discarded upon
>> return (synaptics_parse_hw_state returns 1 causing
>> synaptics_process_packet() to exit immediately).
>>
>> Instead, this patch parses the w value first to determine the packet
>> type, and then use this packet type information to parse the remaining
>> position and pressure fields correctly...
>>
>> Notice that the "else" clause is taken for SGM packets (w != 2), even
>> for clickpads.
> 
> Functionally, there is no difference between assigning new junk or
> reusing old junk, hence that part of the patch is not strictly needed.

True, it's not necessary, but I do like the new flow better. I was
reviewing the patch myself when I started wondering why we ever assigned
junk that was incorrect. I think this will help clean up the code and
make it more readable.

-- Chase

  reply	other threads:[~2011-07-05 18:20 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-29  5:07 [PATCH 00/12] Synaptics image sensor support djkurtz
2011-06-29  5:07 ` [PATCH 01/12] Input: synaptics - cleanup 0x0c query documentation djkurtz
2011-07-05 17:33   ` Chase Douglas
2011-07-06 13:50     ` Daniel Kurtz
2011-07-07  6:30   ` Dmitry Torokhov
2011-06-29  5:07 ` [PATCH 02/12] Input: synaptics - do not invert y if 0 djkurtz
2011-07-04 21:08   ` Henrik Rydberg
2011-07-05  4:29     ` Daniel Kurtz
2011-07-05 18:07       ` Henrik Rydberg
2011-07-05 18:39         ` Chris Bagwell
2011-07-05 23:02         ` Daniel Kurtz
2011-07-05 17:42   ` Chase Douglas
2011-07-05 22:50     ` Daniel Kurtz
2011-07-05 23:06       ` Chase Douglas
2011-07-05 23:15         ` Daniel Kurtz
2011-07-05 23:25           ` Dmitry Torokhov
2011-06-29  5:07 ` [PATCH 03/12] Input: synaptics - fix minimum reported ABS_TOOL_WIDTH djkurtz
2011-06-29 13:28   ` Chris Bagwell
2011-06-29 16:48     ` Daniel Kurtz
2011-06-29 19:46       ` Chris Bagwell
2011-07-04 21:14         ` Henrik Rydberg
2011-07-09  6:24   ` Jeffrey Brown
2011-06-29  5:07 ` [PATCH 04/12] Input: synaptics - set resolution for MT_POSITION_X/Y axes djkurtz
2011-07-05 17:44   ` Chase Douglas
2011-07-07  6:23     ` Dmitry Torokhov
2011-06-29  5:07 ` [PATCH 05/12] Input: synaptics - process button bits in AGM packets djkurtz
2011-07-04 21:24   ` Henrik Rydberg
2011-07-05  4:38     ` Daniel Kurtz
2011-07-05 18:18       ` Henrik Rydberg
2011-07-05 18:19         ` Chase Douglas [this message]
2011-07-05 17:47   ` Chase Douglas
2011-07-07  6:24     ` Dmitry Torokhov
2011-06-29  5:07 ` [PATCH 06/12] Input: synaptics - fuzz position if touchpad reports reduced filtering djkurtz
2011-07-05 17:49   ` Chase Douglas
2011-07-07  6:25     ` Dmitry Torokhov
2011-06-29  5:07 ` [PATCH 07/12] Input: synaptics - rename synaptics_data.mt to agm djkurtz
2011-07-04 21:26   ` Henrik Rydberg
2011-07-05  4:39     ` Daniel Kurtz
2011-07-05 18:20       ` Henrik Rydberg
2011-07-05 17:53   ` Chase Douglas
2011-06-29  5:07 ` [PATCH 08/12] Input: synaptics - rename set_slot to be more descriptive djkurtz
2011-07-05 17:54   ` Chase Douglas
2011-07-07  6:27     ` Dmitry Torokhov
2011-06-29  5:07 ` [PATCH 09/12] Input: synaptics - add image sensor support djkurtz
2011-07-04 21:42   ` Henrik Rydberg
2011-07-05  5:08     ` Daniel Kurtz
2011-07-05 19:27       ` Henrik Rydberg
2011-07-06 16:41         ` Daniel Kurtz
2011-07-06 17:08           ` Chase Douglas
2011-07-06 17:45           ` Dmitry Torokhov
2011-07-06 18:47             ` Henrik Rydberg
2011-07-06 18:58               ` Dmitry Torokhov
2011-07-06 19:31                 ` Henrik Rydberg
2011-07-06 20:00                   ` Dmitry Torokhov
2011-07-06 20:20                     ` Henrik Rydberg
2011-07-06 21:22                       ` Chase Douglas
2011-07-06 21:36                         ` Dmitry Torokhov
2011-07-06 22:16                           ` Chase Douglas
2011-07-06 22:35                             ` Henrik Rydberg
2011-07-06 23:30                               ` Chase Douglas
2011-06-29  5:07 ` [PATCH 10/12] Input: synaptics - decode AGM packet types djkurtz
2011-06-29 10:02   ` Chase Douglas
2011-06-29 10:07     ` Daniel Stone
2011-06-29 10:32       ` Chase Douglas
2011-06-29 11:26         ` Daniel Kurtz
2011-06-29 11:04     ` Daniel Kurtz
2011-07-05 18:17   ` Chase Douglas
2011-07-05 18:55     ` Chris Bagwell
2011-07-06 16:53       ` Daniel Kurtz
2011-06-29  5:07 ` [PATCH 11/12] Input: synaptics - process finger (<=3) transitions djkurtz
2011-06-29  5:07 ` [PATCH 12/12] Input: synaptics - process finger (<=5) transitions djkurtz

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