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Input: trackpoint - Optimize trackpoint init to use power-on reset

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The trackpoint driver sets various parameter default values, all of
which happen to be power-on defaults (Source: IBM TrackPoint Engineering
Specification, Version 4.0. Also confirmed by empirical data).

By sending the power-on reset command to reset all parameters to
power-on state, we can skip the lengthy process of programming all
parameters. In testing, ~2.5 secs of time writing parameters was reduced
to .35 seconds waiting for power-on reset to complete.

Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Shawn Nematbakhsh
2013-04-15 13:49:34 -07:00
committed by Dmitry Torokhov
parent e07a8943b8
commit 0c6a61657d
2 changed files with 162 additions and 83 deletions
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4
drivers/input/mouse/trackpoint.h
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@@ -126,6 +126,8 @@
#define TP_DEF_PTSON 0x00
#define TP_DEF_SKIPBACK 0x00
#define TP_DEF_EXT_DEV 0x00 /* 0 means enabled */
#define TP_DEF_TWOHAND 0x00
#define TP_DEF_SOURCE_TAG 0x00
#define MAKE_PS2_CMD(params, results, cmd) ((params<<12) | (results<<8) | (cmd))
@@ -136,9 +138,9 @@ struct trackpoint_data
unsigned char thresh, upthresh;
unsigned char ztime, jenks;
/* toggles */
unsigned char press_to_select;
unsigned char skipback;
unsigned char ext_dev;
};