425 lines
12 KiB
C
425 lines
12 KiB
C
/*
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* Stephen Evanchik <evanchsa@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Trademarks are the property of their respective owners.
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*/
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/serio.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/libps2.h>
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#include <linux/proc_fs.h>
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#include <asm/uaccess.h>
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#include "psmouse.h"
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#include "trackpoint.h"
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/*
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* Power-on Reset: Resets all trackpoint parameters, including RAM values,
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* to defaults.
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* Returns zero on success, non-zero on failure.
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*/
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static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
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{
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unsigned char results[2];
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int tries = 0;
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/* Issue POR command, and repeat up to once if 0xFC00 received */
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do {
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if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
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ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 2, TP_POR)))
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return -1;
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} while (results[0] == 0xFC && results[1] == 0x00 && ++tries < 2);
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/* Check for success response -- 0xAA00 */
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if (results[0] != 0xAA || results[1] != 0x00)
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return -1;
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return 0;
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}
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/*
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* Device IO: read, write and toggle bit
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*/
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static int trackpoint_read(struct ps2dev *ps2dev,
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unsigned char loc, unsigned char *results)
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{
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if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
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ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
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return -1;
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}
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return 0;
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}
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static int trackpoint_write(struct ps2dev *ps2dev,
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unsigned char loc, unsigned char val)
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{
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if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
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ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) ||
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ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
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ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) {
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return -1;
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}
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return 0;
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}
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static int trackpoint_toggle_bit(struct ps2dev *ps2dev,
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unsigned char loc, unsigned char mask)
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{
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/* Bad things will happen if the loc param isn't in this range */
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if (loc < 0x20 || loc >= 0x2F)
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return -1;
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if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
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ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) ||
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ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
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ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) {
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return -1;
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}
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return 0;
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}
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static int trackpoint_update_bit(struct ps2dev *ps2dev, unsigned char loc,
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unsigned char mask, unsigned char value)
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{
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int retval = 0;
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unsigned char data;
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trackpoint_read(ps2dev, loc, &data);
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if (((data & mask) == mask) != !!value)
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retval = trackpoint_toggle_bit(ps2dev, loc, mask);
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return retval;
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}
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/*
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* Trackpoint-specific attributes
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*/
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struct trackpoint_attr_data {
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size_t field_offset;
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unsigned char command;
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unsigned char mask;
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unsigned char inverted;
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unsigned char power_on_default;
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};
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static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse, void *data, char *buf)
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{
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struct trackpoint_data *tp = psmouse->private;
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struct trackpoint_attr_data *attr = data;
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unsigned char value = *(unsigned char *)((char *)tp + attr->field_offset);
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if (attr->inverted)
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value = !value;
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return sprintf(buf, "%u\n", value);
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}
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static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data,
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const char *buf, size_t count)
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{
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struct trackpoint_data *tp = psmouse->private;
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struct trackpoint_attr_data *attr = data;
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unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset);
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unsigned char value;
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int err;
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err = kstrtou8(buf, 10, &value);
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if (err)
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return err;
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*field = value;
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trackpoint_write(&psmouse->ps2dev, attr->command, value);
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return count;
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}
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#define TRACKPOINT_INT_ATTR(_name, _command, _default) \
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static struct trackpoint_attr_data trackpoint_attr_##_name = { \
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.field_offset = offsetof(struct trackpoint_data, _name), \
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.command = _command, \
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.power_on_default = _default, \
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}; \
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PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
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&trackpoint_attr_##_name, \
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trackpoint_show_int_attr, trackpoint_set_int_attr)
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static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data,
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const char *buf, size_t count)
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{
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struct trackpoint_data *tp = psmouse->private;
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struct trackpoint_attr_data *attr = data;
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unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset);
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unsigned int value;
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int err;
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err = kstrtouint(buf, 10, &value);
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if (err)
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return err;
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if (value > 1)
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return -EINVAL;
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if (attr->inverted)
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value = !value;
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if (*field != value) {
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*field = value;
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trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask);
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}
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return count;
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}
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#define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv, _default) \
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static struct trackpoint_attr_data trackpoint_attr_##_name = { \
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.field_offset = offsetof(struct trackpoint_data, \
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_name), \
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.command = _command, \
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.mask = _mask, \
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.inverted = _inv, \
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.power_on_default = _default, \
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}; \
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PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
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&trackpoint_attr_##_name, \
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trackpoint_show_int_attr, trackpoint_set_bit_attr)
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#define TRACKPOINT_UPDATE_BIT(_psmouse, _tp, _name) \
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do { \
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struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \
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\
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trackpoint_update_bit(&_psmouse->ps2dev, \
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_attr->command, _attr->mask, _tp->_name); \
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} while (0)
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#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \
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do { \
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if (!_power_on || \
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_tp->_name != trackpoint_attr_##_name.power_on_default) { \
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if (!trackpoint_attr_##_name.mask) \
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trackpoint_write(&_psmouse->ps2dev, \
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trackpoint_attr_##_name.command, \
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_tp->_name); \
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else \
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TRACKPOINT_UPDATE_BIT(_psmouse, _tp, _name); \
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} \
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} while (0)
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#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \
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(_tp->_name = trackpoint_attr_##_name.power_on_default)
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TRACKPOINT_INT_ATTR(sensitivity, TP_SENS, TP_DEF_SENS);
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TRACKPOINT_INT_ATTR(speed, TP_SPEED, TP_DEF_SPEED);
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TRACKPOINT_INT_ATTR(inertia, TP_INERTIA, TP_DEF_INERTIA);
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TRACKPOINT_INT_ATTR(reach, TP_REACH, TP_DEF_REACH);
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TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS, TP_DEF_DRAGHYS);
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TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG, TP_DEF_MINDRAG);
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TRACKPOINT_INT_ATTR(thresh, TP_THRESH, TP_DEF_THRESH);
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TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH, TP_DEF_UP_THRESH);
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TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME, TP_DEF_Z_TIME);
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TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV, TP_DEF_JENKS_CURV);
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TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0,
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TP_DEF_PTSON);
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TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0,
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TP_DEF_SKIPBACK);
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TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1,
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TP_DEF_EXT_DEV);
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static struct attribute *trackpoint_attrs[] = {
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&psmouse_attr_sensitivity.dattr.attr,
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&psmouse_attr_speed.dattr.attr,
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&psmouse_attr_inertia.dattr.attr,
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&psmouse_attr_reach.dattr.attr,
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&psmouse_attr_draghys.dattr.attr,
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&psmouse_attr_mindrag.dattr.attr,
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&psmouse_attr_thresh.dattr.attr,
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&psmouse_attr_upthresh.dattr.attr,
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&psmouse_attr_ztime.dattr.attr,
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&psmouse_attr_jenks.dattr.attr,
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&psmouse_attr_press_to_select.dattr.attr,
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&psmouse_attr_skipback.dattr.attr,
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&psmouse_attr_ext_dev.dattr.attr,
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NULL
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};
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static struct attribute_group trackpoint_attr_group = {
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.attrs = trackpoint_attrs,
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};
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static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id)
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{
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unsigned char param[2] = { 0 };
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if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
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return -1;
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if (param[0] != TP_MAGIC_IDENT)
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return -1;
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if (firmware_id)
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*firmware_id = param[1];
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return 0;
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}
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/*
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* Write parameters to trackpad.
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* in_power_on_state: Set to true if TP is in default / power-on state (ex. if
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* power-on reset was run). If so, values will only be
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* written to TP if they differ from power-on default.
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*/
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static int trackpoint_sync(struct psmouse *psmouse, bool in_power_on_state)
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{
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struct trackpoint_data *tp = psmouse->private;
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if (!in_power_on_state) {
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/*
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* Disable features that may make device unusable
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* with this driver.
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*/
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trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND,
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TP_MASK_TWOHAND, TP_DEF_TWOHAND);
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trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG,
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TP_MASK_SOURCE_TAG, TP_DEF_SOURCE_TAG);
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trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_MB,
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TP_MASK_MB, TP_DEF_MB);
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}
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/*
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* These properties can be changed in this driver. Only
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* configure them if the values are non-default or if the TP is in
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* an unknown state.
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*/
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, sensitivity);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, inertia);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, speed);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, reach);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, draghys);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, mindrag);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, thresh);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, upthresh);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ztime);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, jenks);
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/* toggles */
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, press_to_select);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, skipback);
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TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ext_dev);
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return 0;
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}
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static void trackpoint_defaults(struct trackpoint_data *tp)
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{
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, sensitivity);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, speed);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, reach);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, draghys);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, mindrag);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, thresh);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, upthresh);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ztime);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, jenks);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, inertia);
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/* toggles */
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, press_to_select);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, skipback);
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TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ext_dev);
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}
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static void trackpoint_disconnect(struct psmouse *psmouse)
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{
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sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
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kfree(psmouse->private);
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psmouse->private = NULL;
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}
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static int trackpoint_reconnect(struct psmouse *psmouse)
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{
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int reset_fail;
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if (trackpoint_start_protocol(psmouse, NULL))
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return -1;
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reset_fail = trackpoint_power_on_reset(&psmouse->ps2dev);
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if (trackpoint_sync(psmouse, !reset_fail))
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return -1;
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return 0;
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}
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int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
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{
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struct ps2dev *ps2dev = &psmouse->ps2dev;
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unsigned char firmware_id;
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unsigned char button_info;
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int error;
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if (trackpoint_start_protocol(psmouse, &firmware_id))
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return -1;
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if (!set_properties)
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return 0;
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if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) {
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psmouse_warn(psmouse, "failed to get extended button data\n");
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button_info = 0;
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}
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psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL);
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if (!psmouse->private)
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return -ENOMEM;
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psmouse->vendor = "IBM";
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psmouse->name = "TrackPoint";
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psmouse->reconnect = trackpoint_reconnect;
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psmouse->disconnect = trackpoint_disconnect;
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if ((button_info & 0x0f) >= 3)
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__set_bit(BTN_MIDDLE, psmouse->dev->keybit);
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__set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit);
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__set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);
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trackpoint_defaults(psmouse->private);
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error = trackpoint_power_on_reset(&psmouse->ps2dev);
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/* Write defaults to TP only if reset fails. */
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if (error)
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trackpoint_sync(psmouse, false);
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error = sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group);
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if (error) {
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psmouse_err(psmouse,
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"failed to create sysfs attributes, error: %d\n",
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error);
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kfree(psmouse->private);
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psmouse->private = NULL;
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return -1;
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}
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psmouse_info(psmouse,
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"IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
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firmware_id,
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(button_info & 0xf0) >> 4, button_info & 0x0f);
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return 0;
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}
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