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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

241
drivers/input/mouse/trackpoint.c
View File

@ -19,10 +19,35 @@
#include "psmouse.h"
#include "trackpoint.h"
/*
* Power-on Reset: Resets all trackpoint parameters, including RAM values,
* to defaults.
* Returns zero on success, non-zero on failure.
*/
static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
{
unsigned char results[2];
int tries = 0;
/* Issue POR command, and repeat up to once if 0xFC00 received */
do {
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 2, TP_POR)))
return -1;
} while (results[0] == 0xFC && results[1] == 0x00 && ++tries < 2);
/* Check for success response -- 0xAA00 */
if (results[0] != 0xAA || results[1] != 0x00)
return -1;
return 0;
}
/*
* Device IO: read, write and toggle bit
*/
static int trackpoint_read(struct ps2dev *ps2dev, unsigned char loc, unsigned char *results)
static int trackpoint_read(struct ps2dev *ps2dev,
unsigned char loc, unsigned char *results)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
@ -32,7 +57,8 @@ static int trackpoint_read(struct ps2dev *ps2dev, unsigned char loc, unsigned ch
return 0;
}
static int trackpoint_write(struct ps2dev *ps2dev, unsigned char loc, unsigned char val)
static int trackpoint_write(struct ps2dev *ps2dev,
unsigned char loc, unsigned char val)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) ||
@ -44,7 +70,8 @@ static int trackpoint_write(struct ps2dev *ps2dev, unsigned char loc, unsigned c
return 0;
}
static int trackpoint_toggle_bit(struct ps2dev *ps2dev, unsigned char loc, unsigned char mask)
static int trackpoint_toggle_bit(struct ps2dev *ps2dev,
unsigned char loc, unsigned char mask)
{
/* Bad things will happen if the loc param isn't in this range */
if (loc < 0x20 || loc >= 0x2F)
@ -60,6 +87,18 @@ static int trackpoint_toggle_bit(struct ps2dev *ps2dev, unsigned char loc, unsig
return 0;
}
static int trackpoint_update_bit(struct ps2dev *ps2dev, unsigned char loc,
unsigned char mask, unsigned char value)
{
int retval = 0;
unsigned char data;
trackpoint_read(ps2dev, loc, &data);
if (((data & mask) == mask) != !!value)
retval = trackpoint_toggle_bit(ps2dev, loc, mask);
return retval;
}
/*
* Trackpoint-specific attributes
@ -69,6 +108,7 @@ struct trackpoint_attr_data {
unsigned char command;
unsigned char mask;
unsigned char inverted;
unsigned char power_on_default;
};
static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse, void *data, char *buf)
@ -102,10 +142,11 @@ static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data,
return count;
}
#define TRACKPOINT_INT_ATTR(_name, _command) \
#define TRACKPOINT_INT_ATTR(_name, _command, _default) \
static struct trackpoint_attr_data trackpoint_attr_##_name = { \
.field_offset = offsetof(struct trackpoint_data, _name), \
.command = _command, \
.power_on_default = _default, \
}; \
PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
&trackpoint_attr_##_name, \
@ -139,31 +180,60 @@ static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data,
}
#define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv) \
static struct trackpoint_attr_data trackpoint_attr_##_name = { \
.field_offset = offsetof(struct trackpoint_data, _name), \
.command = _command, \
.mask = _mask, \
.inverted = _inv, \
}; \
PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
&trackpoint_attr_##_name, \
trackpoint_show_int_attr, trackpoint_set_bit_attr)
#define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv, _default) \
static struct trackpoint_attr_data trackpoint_attr_##_name = { \
.field_offset = offsetof(struct trackpoint_data, \
_name), \
.command = _command, \
.mask = _mask, \
.inverted = _inv, \
.power_on_default = _default, \
}; \
PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
&trackpoint_attr_##_name, \
trackpoint_show_int_attr, trackpoint_set_bit_attr)
TRACKPOINT_INT_ATTR(sensitivity, TP_SENS);
TRACKPOINT_INT_ATTR(speed, TP_SPEED);
TRACKPOINT_INT_ATTR(inertia, TP_INERTIA);
TRACKPOINT_INT_ATTR(reach, TP_REACH);
TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS);
TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG);
TRACKPOINT_INT_ATTR(thresh, TP_THRESH);
TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH);
TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME);
TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV);
#define TRACKPOINT_UPDATE_BIT(_psmouse, _tp, _name) \
do { \
struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \
\
trackpoint_update_bit(&_psmouse->ps2dev, \
_attr->command, _attr->mask, _tp->_name); \
} while (0)
TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0);
TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0);
TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1);
#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \
do { \
if (!_power_on || \
_tp->_name != trackpoint_attr_##_name.power_on_default) { \
if (!trackpoint_attr_##_name.mask) \
trackpoint_write(&_psmouse->ps2dev, \
trackpoint_attr_##_name.command, \
_tp->_name); \
else \
TRACKPOINT_UPDATE_BIT(_psmouse, _tp, _name); \
} \
} while (0)
#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \
(_tp->_name = trackpoint_attr_##_name.power_on_default)
TRACKPOINT_INT_ATTR(sensitivity, TP_SENS, TP_DEF_SENS);
TRACKPOINT_INT_ATTR(speed, TP_SPEED, TP_DEF_SPEED);
TRACKPOINT_INT_ATTR(inertia, TP_INERTIA, TP_DEF_INERTIA);
TRACKPOINT_INT_ATTR(reach, TP_REACH, TP_DEF_REACH);
TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS, TP_DEF_DRAGHYS);
TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG, TP_DEF_MINDRAG);
TRACKPOINT_INT_ATTR(thresh, TP_THRESH, TP_DEF_THRESH);
TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH, TP_DEF_UP_THRESH);
TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME, TP_DEF_Z_TIME);
TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV, TP_DEF_JENKS_CURV);
TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0,
TP_DEF_PTSON);
TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0,
TP_DEF_SKIPBACK);
TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1,
TP_DEF_EXT_DEV);
static struct attribute *trackpoint_attrs[] = {
&psmouse_attr_sensitivity.dattr.attr,
@ -202,73 +272,72 @@ static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *fir
return 0;
}
static int trackpoint_sync(struct psmouse *psmouse)
/*
* Write parameters to trackpad.
* in_power_on_state: Set to true if TP is in default / power-on state (ex. if
* power-on reset was run). If so, values will only be
* written to TP if they differ from power-on default.
*/
static int trackpoint_sync(struct psmouse *psmouse, bool in_power_on_state)
{
struct trackpoint_data *tp = psmouse->private;
unsigned char toggle;
/* Disable features that may make device unusable with this driver */
trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, &toggle);
if (toggle & TP_MASK_TWOHAND)
trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, TP_MASK_TWOHAND);
if (!in_power_on_state) {
/*
* Disable features that may make device unusable
* with this driver.
*/
trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND,
TP_MASK_TWOHAND, TP_DEF_TWOHAND);
trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, &toggle);
if (toggle & TP_MASK_SOURCE_TAG)
trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, TP_MASK_SOURCE_TAG);
trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG,
TP_MASK_SOURCE_TAG, TP_DEF_SOURCE_TAG);
trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_MB, &toggle);
if (toggle & TP_MASK_MB)
trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_MB, TP_MASK_MB);
trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_MB,
TP_MASK_MB, TP_DEF_MB);
}
/* Push the config to the device */
trackpoint_write(&psmouse->ps2dev, TP_SENS, tp->sensitivity);
trackpoint_write(&psmouse->ps2dev, TP_INERTIA, tp->inertia);
trackpoint_write(&psmouse->ps2dev, TP_SPEED, tp->speed);
/*
* These properties can be changed in this driver. Only
* configure them if the values are non-default or if the TP is in
* an unknown state.
*/
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, sensitivity);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, inertia);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, speed);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, reach);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, draghys);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, mindrag);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, thresh);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, upthresh);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ztime);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, jenks);
trackpoint_write(&psmouse->ps2dev, TP_REACH, tp->reach);
trackpoint_write(&psmouse->ps2dev, TP_DRAGHYS, tp->draghys);
trackpoint_write(&psmouse->ps2dev, TP_MINDRAG, tp->mindrag);
trackpoint_write(&psmouse->ps2dev, TP_THRESH, tp->thresh);
trackpoint_write(&psmouse->ps2dev, TP_UP_THRESH, tp->upthresh);
trackpoint_write(&psmouse->ps2dev, TP_Z_TIME, tp->ztime);
trackpoint_write(&psmouse->ps2dev, TP_JENKS_CURV, tp->jenks);
trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_PTSON, &toggle);
if (((toggle & TP_MASK_PTSON) == TP_MASK_PTSON) != tp->press_to_select)
trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_PTSON, TP_MASK_PTSON);
trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, &toggle);
if (((toggle & TP_MASK_SKIPBACK) == TP_MASK_SKIPBACK) != tp->skipback)
trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK);
trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, &toggle);
if (((toggle & TP_MASK_EXT_DEV) == TP_MASK_EXT_DEV) != tp->ext_dev)
trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV);
/* toggles */
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, press_to_select);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, skipback);
TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ext_dev);
return 0;
}
static void trackpoint_defaults(struct trackpoint_data *tp)
{
tp->press_to_select = TP_DEF_PTSON;
tp->sensitivity = TP_DEF_SENS;
tp->speed = TP_DEF_SPEED;
tp->reach = TP_DEF_REACH;
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, sensitivity);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, speed);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, reach);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, draghys);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, mindrag);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, thresh);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, upthresh);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ztime);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, jenks);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, inertia);
tp->draghys = TP_DEF_DRAGHYS;
tp->mindrag = TP_DEF_MINDRAG;
tp->thresh = TP_DEF_THRESH;
tp->upthresh = TP_DEF_UP_THRESH;
tp->ztime = TP_DEF_Z_TIME;
tp->jenks = TP_DEF_JENKS_CURV;
tp->inertia = TP_DEF_INERTIA;
tp->skipback = TP_DEF_SKIPBACK;
tp->ext_dev = TP_DEF_EXT_DEV;
/* toggles */
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, press_to_select);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, skipback);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ext_dev);
}
static void trackpoint_disconnect(struct psmouse *psmouse)
@ -281,10 +350,13 @@ static void trackpoint_disconnect(struct psmouse *psmouse)
static int trackpoint_reconnect(struct psmouse *psmouse)
{
int reset_fail;
if (trackpoint_start_protocol(psmouse, NULL))
return -1;
if (trackpoint_sync(psmouse))
reset_fail = trackpoint_power_on_reset(&psmouse->ps2dev);
if (trackpoint_sync(psmouse, !reset_fail))
return -1;
return 0;
@ -322,7 +394,12 @@ int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
trackpoint_defaults(psmouse->private);
trackpoint_sync(psmouse);
error = trackpoint_power_on_reset(&psmouse->ps2dev);
/* Write defaults to TP only if reset fails. */
if (error)
trackpoint_sync(psmouse, false);
error = sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group);
if (error) {

4
drivers/input/mouse/trackpoint.h
View File

@ -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;
};