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linux-next/drivers/input/mouse/trackpoint.c
haarp 2ba3532047 Input: psmouse - expose drift duration for IBM trackpoints 
IBM Trackpoints have a feature to compensate for drift by recalibrating
themselves periodically. By default, if for 0.5 seconds there is no change
in position, it's used as the new zero. This duration is too low. Often,
the calibration happens when the trackpoint is in fact being used.

IBM's Trackpoint Engineering Specifications show a configuration register
that allows changing this duration, rstdft1.

Expose it via sysfs among the other settings.

Signed-off-by: Mike Murdoch <main.haarp@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-12-17 15:46:51 -08:00

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/*
* Stephen Evanchik <evanchsa@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* Trademarks are the property of their respective owners.
*/
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/serio.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/libps2.h>
#include <linux/proc_fs.h>
#include <asm/uaccess.h>
#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)
{
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
return -1;
}
return 0;
}
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)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) {
return -1;
}
return 0;
}
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)
return -1;
if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) {
return -1;
}
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
*/
struct trackpoint_attr_data {
size_t field_offset;
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)
{
struct trackpoint_data *tp = psmouse->private;
struct trackpoint_attr_data *attr = data;
unsigned char value = *(unsigned char *)((char *)tp + attr->field_offset);
if (attr->inverted)
value = !value;
return sprintf(buf, "%u\n", value);
}
static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data,
const char *buf, size_t count)
{
struct trackpoint_data *tp = psmouse->private;
struct trackpoint_attr_data *attr = data;
unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset);
unsigned char value;
int err;
err = kstrtou8(buf, 10, &value);
if (err)
return err;
*field = value;
trackpoint_write(&psmouse->ps2dev, attr->command, value);
return count;
}
#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, \
trackpoint_show_int_attr, trackpoint_set_int_attr)
static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data,
const char *buf, size_t count)
{
struct trackpoint_data *tp = psmouse->private;
struct trackpoint_attr_data *attr = data;
unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset);
unsigned int value;
int err;
err = kstrtouint(buf, 10, &value);
if (err)
return err;
if (value > 1)
return -EINVAL;
if (attr->inverted)
value = !value;
if (*field != value) {
*field = value;
trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask);
}
return count;
}
#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)
#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)
#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_INT_ATTR(drift_time, TP_DRIFT_TIME, TP_DEF_DRIFT_TIME);
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,
&psmouse_attr_speed.dattr.attr,
&psmouse_attr_inertia.dattr.attr,
&psmouse_attr_reach.dattr.attr,
&psmouse_attr_draghys.dattr.attr,
&psmouse_attr_mindrag.dattr.attr,
&psmouse_attr_thresh.dattr.attr,
&psmouse_attr_upthresh.dattr.attr,
&psmouse_attr_ztime.dattr.attr,
&psmouse_attr_jenks.dattr.attr,
&psmouse_attr_drift_time.dattr.attr,
&psmouse_attr_press_to_select.dattr.attr,
&psmouse_attr_skipback.dattr.attr,
&psmouse_attr_ext_dev.dattr.attr,
NULL
};
static struct attribute_group trackpoint_attr_group = {
.attrs = trackpoint_attrs,
};
static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id)
{
unsigned char param[2] = { 0 };
if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
return -1;
if (param[0] != TP_MAGIC_IDENT)
return -1;
if (firmware_id)
*firmware_id = param[1];
return 0;
}
/*
* 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;
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_update_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG,
TP_MASK_SOURCE_TAG, TP_DEF_SOURCE_TAG);
trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_MB,
TP_MASK_MB, TP_DEF_MB);
}
/*
* 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_UPDATE(in_power_on_state, psmouse, tp, drift_time);
/* 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)
{
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, drift_time);
TRACKPOINT_SET_POWER_ON_DEFAULT(tp, inertia);
/* 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)
{
sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
kfree(psmouse->private);
psmouse->private = NULL;
}
static int trackpoint_reconnect(struct psmouse *psmouse)
{
int reset_fail;
if (trackpoint_start_protocol(psmouse, NULL))
return -1;
reset_fail = trackpoint_power_on_reset(&psmouse->ps2dev);
if (trackpoint_sync(psmouse, !reset_fail))
return -1;
return 0;
}
int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char firmware_id;
unsigned char button_info;
int error;
if (trackpoint_start_protocol(psmouse, &firmware_id))
return -1;
if (!set_properties)
return 0;
if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) {
psmouse_warn(psmouse, "failed to get extended button data\n");
button_info = 0;
}
psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL);
if (!psmouse->private)
return -ENOMEM;
psmouse->vendor = "IBM";
psmouse->name = "TrackPoint";
psmouse->reconnect = trackpoint_reconnect;
psmouse->disconnect = trackpoint_disconnect;
if ((button_info & 0x0f) >= 3)
__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
__set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit);
__set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);
trackpoint_defaults(psmouse->private);
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) {
psmouse_err(psmouse,
"failed to create sysfs attributes, error: %d\n",
error);
kfree(psmouse->private);
psmouse->private = NULL;
return -1;
}
psmouse_info(psmouse,
"IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
firmware_id,
(button_info & 0xf0) >> 4, button_info & 0x0f);
return 0;
}
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