/* * 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_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_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); 	/* 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, 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); 	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;}