[people/arne_f/kernel.git] / drivers / input / mouse / trackpoint.c

/*
 * 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 <linux/uaccess.h>
#include "psmouse.h"
#include "trackpoint.h"

static const char * const trackpoint_variants[] = {
	[TP_VARIANT_IBM]		= "IBM",
	[TP_VARIANT_ALPS]		= "ALPS",
	[TP_VARIANT_ELAN]		= "Elan",
	[TP_VARIANT_NXP]		= "NXP",
	[TP_VARIANT_JYT_SYNAPTICS]	= "JYT_Synaptics",
	[TP_VARIANT_SYNAPTICS]		= "Synaptics",
};

/*
 * 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)
{
	u8 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 -ENODEV;

	return 0;
}

/*
 * Device IO: read, write and toggle bit
 */
static int trackpoint_read(struct ps2dev *ps2dev, u8 loc, u8 *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, u8 loc, u8 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, u8 loc, u8 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,
				 u8 loc, u8 mask, u8 value)
{
	int retval = 0;
	u8 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;
	u8 command;
	u8 mask;
	bool inverted;
	u8 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;
	u8 value = *(u8 *)((void *)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;
	u8 *field = (void *)tp + attr->field_offset;
	u8 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;
	bool *field = (void *)tp + attr->field_offset;
	bool value;
	int err;

	err = kstrtobool(buf, &value);
	if (err)
		return err;

	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)

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, false,
		    TP_DEF_PTSON);
TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, false,
		    TP_DEF_SKIPBACK);
TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, true,
		    TP_DEF_EXT_DEV);

static bool trackpoint_is_attr_available(struct psmouse *psmouse,
					 struct attribute *attr)
{
	struct trackpoint_data *tp = psmouse->private;

	return tp->variant_id == TP_VARIANT_IBM ||
		attr == &psmouse_attr_sensitivity.dattr.attr ||
		attr == &psmouse_attr_press_to_select.dattr.attr;
}

static umode_t trackpoint_is_attr_visible(struct kobject *kobj,
					  struct attribute *attr, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct serio *serio = to_serio_port(dev);
	struct psmouse *psmouse = serio_get_drvdata(serio);

	return trackpoint_is_attr_available(psmouse, attr) ? attr->mode : 0;
}

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 = {
	.is_visible	= trackpoint_is_attr_visible,
	.attrs		= trackpoint_attrs,
};

#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name)		\
do {									\
	struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name;	\
									\
	if ((!_power_on || _tp->_name != _attr->power_on_default) &&	\
	    trackpoint_is_attr_available(_psmouse,			\
				&psmouse_attr_##_name.dattr.attr)) {	\
		if (!_attr->mask)					\
			trackpoint_write(&_psmouse->ps2dev,		\
					 _attr->command, _tp->_name);	\
		else							\
			trackpoint_update_bit(&_psmouse->ps2dev,	\
					_attr->command, _attr->mask,	\
					_tp->_name);			\
	}								\
} while (0)

#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name)			\
do {									\
	_tp->_name = trackpoint_attr_##_name.power_on_default;		\
} while (0)

static int trackpoint_start_protocol(struct psmouse *psmouse,
				     u8 *variant_id, u8 *firmware_id)
{
	u8 param[2] = { 0 };
	int error;

	error = ps2_command(&psmouse->ps2dev,
			    param, MAKE_PS2_CMD(0, 2, TP_READ_ID));
	if (error)
		return error;

	switch (param[0]) {
	case TP_VARIANT_IBM:
	case TP_VARIANT_ALPS:
	case TP_VARIANT_ELAN:
	case TP_VARIANT_NXP:
		if (variant_id)
			*variant_id = param[0];
		if (firmware_id)
			*firmware_id = param[1];
		return 0;
	}

	return -ENODEV;
}

/*
 * 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 && tp->variant_id == TP_VARIANT_IBM) {
		/*
		 * 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)
{
	device_remove_group(&psmouse->ps2dev.serio->dev,
			    &trackpoint_attr_group);

	kfree(psmouse->private);
	psmouse->private = NULL;
}

static int trackpoint_reconnect(struct psmouse *psmouse)
{
	struct trackpoint_data *tp = psmouse->private;
	int error;
	bool was_reset;

	error = trackpoint_start_protocol(psmouse, NULL, NULL);
	if (error)
		return error;

	was_reset = tp->variant_id == TP_VARIANT_IBM &&
		    trackpoint_power_on_reset(&psmouse->ps2dev) == 0;

	error = trackpoint_sync(psmouse, was_reset);
	if (error)
		return error;

	return 0;
}

int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	struct trackpoint_data *tp;
	u8 variant_id;
	u8 firmware_id;
	u8 button_info;
	int error;

	error = trackpoint_start_protocol(psmouse, &variant_id, &firmware_id);
	if (error)
		return error;

	if (!set_properties)
		return 0;

	tp = kzalloc(sizeof(*tp), GFP_KERNEL);
	if (!tp)
		return -ENOMEM;

	trackpoint_defaults(tp);
	tp->variant_id = variant_id;
	tp->firmware_id = firmware_id;

	psmouse->private = tp;

	psmouse->vendor = trackpoint_variants[variant_id];
	psmouse->name = "TrackPoint";

	psmouse->reconnect = trackpoint_reconnect;
	psmouse->disconnect = trackpoint_disconnect;

	if (variant_id != TP_VARIANT_IBM) {
		/* Newer variants do not support extended button query. */
		button_info = 0x33;
	} else {
		error = trackpoint_read(ps2dev, TP_EXT_BTN, &button_info);
		if (error) {
			psmouse_warn(psmouse,
				     "failed to get extended button data, assuming 3 buttons\n");
			button_info = 0x33;
		} else if (!button_info) {
			psmouse_warn(psmouse,
				     "got 0 in extended button data, assuming 3 buttons\n");
			button_info = 0x33;
		}
	}

	if ((button_info & 0x0f) >= 3)
		input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);

	__set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit);
	__set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);

	if (variant_id != TP_VARIANT_IBM ||
	    trackpoint_power_on_reset(ps2dev) != 0) {
		/*
		 * Write defaults to TP if we did not reset the trackpoint.
		 */
		trackpoint_sync(psmouse, false);
	}

	error = device_add_group(&ps2dev->serio->dev, &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,
		     "%s TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
		     psmouse->vendor, firmware_id,
		     (button_info & 0xf0) >> 4, button_info & 0x0f);

	return 0;
}
Commit	Line	Data
541e316a SE	1	/*
	2	* Stephen Evanchik <evanchsa@gmail.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* the Free Software Foundation.
	7	*
	8	* Trademarks are the property of their respective owners.
	9	*/
	10
5a0e3ad6	11	#include <linux/slab.h>
541e316a SE	12	#include <linux/delay.h>
	13	#include <linux/serio.h>
	14	#include <linux/module.h>
541e316a SE	15	#include <linux/input.h>
	16	#include <linux/libps2.h>
	17	#include <linux/proc_fs.h>
7c0f6ba6	18	#include <linux/uaccess.h>
541e316a SE	19	#include "psmouse.h"
	20	#include "trackpoint.h"
	21
203a6033	22	static const char * const trackpoint_variants[] = {
d7c3f9ff VH	23	[TP_VARIANT_IBM] = "IBM",
	24	[TP_VARIANT_ALPS] = "ALPS",
	25	[TP_VARIANT_ELAN] = "Elan",
	26	[TP_VARIANT_NXP] = "NXP",
	27	[TP_VARIANT_JYT_SYNAPTICS] = "JYT_Synaptics",
	28	[TP_VARIANT_SYNAPTICS] = "Synaptics",
203a6033 DT	29	};
203a6033 DT	30
0c6a6165 SN	31	/*
	32	* Power-on Reset: Resets all trackpoint parameters, including RAM values,
	33	* to defaults.
	34	* Returns zero on success, non-zero on failure.
	35	*/
	36	static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
	37	{
203a6033	38	u8 results[2];
0c6a6165 SN	39	int tries = 0;
	40
	41	/* Issue POR command, and repeat up to once if 0xFC00 received */
	42	do {
	43	if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) \|\|
	44	ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 2, TP_POR)))
	45	return -1;
	46	} while (results[0] == 0xFC && results[1] == 0x00 && ++tries < 2);
	47
	48	/* Check for success response -- 0xAA00 */
	49	if (results[0] != 0xAA \|\| results[1] != 0x00)
203a6033	50	return -ENODEV;
0c6a6165 SN	51
	52	return 0;
	53	}
	54
541e316a SE	55	/*
	56	* Device IO: read, write and toggle bit
	57	*/
203a6033	58	static int trackpoint_read(struct ps2dev ps2dev, u8 loc, u8 results)
541e316a SE	59	{
	60	if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) \|\|
	61	ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
	62	return -1;
	63	}
	64
	65	return 0;
	66	}
	67
203a6033	68	static int trackpoint_write(struct ps2dev *ps2dev, u8 loc, u8 val)
541e316a SE	69	{
	70	if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) \|\|
	71	ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) \|\|
	72	ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) \|\|
	73	ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) {
	74	return -1;
	75	}
	76
	77	return 0;
	78	}
	79
203a6033	80	static int trackpoint_toggle_bit(struct ps2dev *ps2dev, u8 loc, u8 mask)
541e316a SE	81	{
	82	/* Bad things will happen if the loc param isn't in this range */
	83	if (loc < 0x20 \|\| loc >= 0x2F)
	84	return -1;
	85
	86	if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) \|\|
	87	ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) \|\|
	88	ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) \|\|
	89	ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) {
	90	return -1;
	91	}
	92
	93	return 0;
	94	}
	95
203a6033 DT	96	static int trackpoint_update_bit(struct ps2dev *ps2dev,
203a6033 DT	97	u8 loc, u8 mask, u8 value)
0c6a6165 SN	98	{
0c6a6165 SN	99	int retval = 0;
203a6033	100	u8 data;
0c6a6165 SN	101
	102	trackpoint_read(ps2dev, loc, &data);
	103	if (((data & mask) == mask) != !!value)
	104	retval = trackpoint_toggle_bit(ps2dev, loc, mask);
	105
	106	return retval;
	107	}
541e316a	108
cfe9e888 DT	109	/*
	110	* Trackpoint-specific attributes
	111	*/
	112	struct trackpoint_attr_data {
	113	size_t field_offset;
203a6033 DT	114	u8 command;
	115	u8 mask;
	116	bool inverted;
	117	u8 power_on_default;
cfe9e888	118	};
541e316a	119
203a6033 DT	120	static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse,
203a6033 DT	121	void data, char buf)
cfe9e888 DT	122	{
	123	struct trackpoint_data *tp = psmouse->private;
	124	struct trackpoint_attr_data *attr = data;
203a6033	125	u8 value = (u8 )((void *)tp + attr->field_offset);
b8044c74 DT	126
	127	if (attr->inverted)
	128	value = !value;
541e316a	129
b8044c74	130	return sprintf(buf, "%u\n", value);
cfe9e888	131	}
541e316a	132
cfe9e888 DT	133	static ssize_t trackpoint_set_int_attr(struct psmouse psmouse, void data,
	134	const char *buf, size_t count)
	135	{
	136	struct trackpoint_data *tp = psmouse->private;
	137	struct trackpoint_attr_data *attr = data;
203a6033 DT	138	u8 field = (void )tp + attr->field_offset;
203a6033 DT	139	u8 value;
76496e7a	140	int err;
541e316a	141
76496e7a JD	142	err = kstrtou8(buf, 10, &value);
	143	if (err)
	144	return err;
541e316a	145
cfe9e888 DT	146	*field = value;
cfe9e888 DT	147	trackpoint_write(&psmouse->ps2dev, attr->command, value);
541e316a	148
cfe9e888 DT	149	return count;
cfe9e888 DT	150	}
541e316a	151
0c6a6165	152	#define TRACKPOINT_INT_ATTR(_name, _command, _default) \
cfe9e888 DT	153	static struct trackpoint_attr_data trackpoint_attr_##_name = { \
	154	.field_offset = offsetof(struct trackpoint_data, _name), \
	155	.command = _command, \
0c6a6165	156	.power_on_default = _default, \
cfe9e888 DT	157	}; \
	158	PSMOUSE_DEFINE_ATTR(_name, S_IWUSR \| S_IRUGO, \
	159	&trackpoint_attr_##_name, \
	160	trackpoint_show_int_attr, trackpoint_set_int_attr)
	161
	162	static ssize_t trackpoint_set_bit_attr(struct psmouse psmouse, void data,
	163	const char *buf, size_t count)
	164	{
	165	struct trackpoint_data *tp = psmouse->private;
	166	struct trackpoint_attr_data *attr = data;
203a6033 DT	167	bool field = (void )tp + attr->field_offset;
203a6033 DT	168	bool value;
76496e7a JD	169	int err;
76496e7a JD	170
203a6033	171	err = kstrtobool(buf, &value);
76496e7a JD	172	if (err)
76496e7a JD	173	return err;
cfe9e888	174
b8044c74 DT	175	if (attr->inverted)
	176	value = !value;
	177
cfe9e888 DT	178	if (*field != value) {
	179	*field = value;
	180	trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask);
	181	}
541e316a	182
cfe9e888 DT	183	return count;
cfe9e888 DT	184	}
541e316a	185
541e316a	186
0c6a6165 SN	187	#define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv, _default) \
	188	static struct trackpoint_attr_data trackpoint_attr_##_name = { \
	189	.field_offset = offsetof(struct trackpoint_data, \
	190	_name), \
	191	.command = _command, \
	192	.mask = _mask, \
	193	.inverted = _inv, \
	194	.power_on_default = _default, \
	195	}; \
	196	PSMOUSE_DEFINE_ATTR(_name, S_IWUSR \| S_IRUGO, \
	197	&trackpoint_attr_##_name, \
	198	trackpoint_show_int_attr, trackpoint_set_bit_attr)
	199
0c6a6165 SN	200	TRACKPOINT_INT_ATTR(sensitivity, TP_SENS, TP_DEF_SENS);
	201	TRACKPOINT_INT_ATTR(speed, TP_SPEED, TP_DEF_SPEED);
	202	TRACKPOINT_INT_ATTR(inertia, TP_INERTIA, TP_DEF_INERTIA);
	203	TRACKPOINT_INT_ATTR(reach, TP_REACH, TP_DEF_REACH);
	204	TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS, TP_DEF_DRAGHYS);
	205	TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG, TP_DEF_MINDRAG);
	206	TRACKPOINT_INT_ATTR(thresh, TP_THRESH, TP_DEF_THRESH);
	207	TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH, TP_DEF_UP_THRESH);
	208	TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME, TP_DEF_Z_TIME);
	209	TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV, TP_DEF_JENKS_CURV);
2ba35320	210	TRACKPOINT_INT_ATTR(drift_time, TP_DRIFT_TIME, TP_DEF_DRIFT_TIME);
0c6a6165	211
203a6033	212	TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, false,
0c6a6165	213	TP_DEF_PTSON);
203a6033	214	TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, false,
0c6a6165	215	TP_DEF_SKIPBACK);
203a6033	216	TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, true,
0c6a6165	217	TP_DEF_EXT_DEV);
541e316a	218
203a6033 DT	219	static bool trackpoint_is_attr_available(struct psmouse *psmouse,
	220	struct attribute *attr)
	221	{
	222	struct trackpoint_data *tp = psmouse->private;
	223
	224	return tp->variant_id == TP_VARIANT_IBM \|\|
	225	attr == &psmouse_attr_sensitivity.dattr.attr \|\|
	226	attr == &psmouse_attr_press_to_select.dattr.attr;
	227	}
	228
	229	static umode_t trackpoint_is_attr_visible(struct kobject *kobj,
	230	struct attribute *attr, int n)
	231	{
	232	struct device *dev = container_of(kobj, struct device, kobj);
	233	struct serio *serio = to_serio_port(dev);
	234	struct psmouse *psmouse = serio_get_drvdata(serio);
	235
	236	return trackpoint_is_attr_available(psmouse, attr) ? attr->mode : 0;
	237	}
	238
541e316a	239	static struct attribute *trackpoint_attrs[] = {
cfe9e888 DT	240	&psmouse_attr_sensitivity.dattr.attr,
	241	&psmouse_attr_speed.dattr.attr,
	242	&psmouse_attr_inertia.dattr.attr,
	243	&psmouse_attr_reach.dattr.attr,
	244	&psmouse_attr_draghys.dattr.attr,
	245	&psmouse_attr_mindrag.dattr.attr,
	246	&psmouse_attr_thresh.dattr.attr,
	247	&psmouse_attr_upthresh.dattr.attr,
	248	&psmouse_attr_ztime.dattr.attr,
	249	&psmouse_attr_jenks.dattr.attr,
2ba35320	250	&psmouse_attr_drift_time.dattr.attr,
cfe9e888 DT	251	&psmouse_attr_press_to_select.dattr.attr,
	252	&psmouse_attr_skipback.dattr.attr,
	253	&psmouse_attr_ext_dev.dattr.attr,
541e316a SE	254	NULL
	255	};
	256
	257	static struct attribute_group trackpoint_attr_group = {
203a6033 DT	258	.is_visible = trackpoint_is_attr_visible,
203a6033 DT	259	.attrs = trackpoint_attrs,
541e316a SE	260	};
541e316a SE	261
203a6033 DT	262	#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \
	263	do { \
	264	struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \
	265	\
	266	if ((!_power_on \|\| _tp->_name != _attr->power_on_default) && \
	267	trackpoint_is_attr_available(_psmouse, \
	268	&psmouse_attr_##_name.dattr.attr)) { \
	269	if (!_attr->mask) \
	270	trackpoint_write(&_psmouse->ps2dev, \
	271	_attr->command, _tp->_name); \
	272	else \
	273	trackpoint_update_bit(&_psmouse->ps2dev, \
	274	_attr->command, _attr->mask, \
	275	_tp->_name); \
	276	} \
	277	} while (0)
541e316a	278
203a6033 DT	279	#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \
	280	do { \
	281	_tp->_name = trackpoint_attr_##_name.power_on_default; \
	282	} while (0)
184dd275	283
203a6033 DT	284	static int trackpoint_start_protocol(struct psmouse *psmouse,
	285	u8 variant_id, u8 firmware_id)
	286	{
	287	u8 param[2] = { 0 };
	288	int error;
184dd275	289
203a6033 DT	290	error = ps2_command(&psmouse->ps2dev,
	291	param, MAKE_PS2_CMD(0, 2, TP_READ_ID));
	292	if (error)
	293	return error;
	294
	295	switch (param[0]) {
	296	case TP_VARIANT_IBM:
	297	case TP_VARIANT_ALPS:
	298	case TP_VARIANT_ELAN:
	299	case TP_VARIANT_NXP:
	300	if (variant_id)
	301	*variant_id = param[0];
	302	if (firmware_id)
	303	*firmware_id = param[1];
	304	return 0;
	305	}
184dd275	306
203a6033	307	return -ENODEV;
541e316a SE	308	}
541e316a SE	309
0c6a6165 SN	310	/*
	311	* Write parameters to trackpad.
	312	* in_power_on_state: Set to true if TP is in default / power-on state (ex. if
	313	* power-on reset was run). If so, values will only be
	314	* written to TP if they differ from power-on default.
	315	*/
	316	static int trackpoint_sync(struct psmouse *psmouse, bool in_power_on_state)
541e316a	317	{
541e316a	318	struct trackpoint_data *tp = psmouse->private;
541e316a	319
203a6033	320	if (!in_power_on_state && tp->variant_id == TP_VARIANT_IBM) {
0c6a6165 SN	321	/*
	322	* Disable features that may make device unusable
	323	* with this driver.
	324	*/
	325	trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND,
	326	TP_MASK_TWOHAND, TP_DEF_TWOHAND);
541e316a	327
0c6a6165 SN	328	trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG,
0c6a6165 SN	329	TP_MASK_SOURCE_TAG, TP_DEF_SOURCE_TAG);
541e316a	330
0c6a6165 SN	331	trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_MB,
	332	TP_MASK_MB, TP_DEF_MB);
	333	}
541e316a	334
0c6a6165 SN	335	/*
	336	* These properties can be changed in this driver. Only
	337	* configure them if the values are non-default or if the TP is in
	338	* an unknown state.
	339	*/
	340	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, sensitivity);
	341	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, inertia);
	342	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, speed);
	343	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, reach);
	344	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, draghys);
	345	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, mindrag);
	346	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, thresh);
	347	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, upthresh);
	348	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ztime);
	349	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, jenks);
2ba35320	350	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, drift_time);
0c6a6165 SN	351
	352	/* toggles */
	353	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, press_to_select);
	354	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, skipback);
	355	TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ext_dev);
541e316a SE	356
	357	return 0;
	358	}
	359
	360	static void trackpoint_defaults(struct trackpoint_data *tp)
	361	{
0c6a6165 SN	362	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, sensitivity);
	363	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, speed);
	364	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, reach);
	365	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, draghys);
	366	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, mindrag);
	367	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, thresh);
	368	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, upthresh);
	369	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ztime);
	370	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, jenks);
2ba35320	371	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, drift_time);
0c6a6165 SN	372	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, inertia);
	373
	374	/* toggles */
	375	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, press_to_select);
	376	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, skipback);
	377	TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ext_dev);
541e316a SE	378	}
541e316a SE	379
184dd275 DT	380	static void trackpoint_disconnect(struct psmouse *psmouse)
184dd275 DT	381	{
203a6033 DT	382	device_remove_group(&psmouse->ps2dev.serio->dev,
203a6033 DT	383	&trackpoint_attr_group);
184dd275 DT	384
	385	kfree(psmouse->private);
	386	psmouse->private = NULL;
	387	}
	388
	389	static int trackpoint_reconnect(struct psmouse *psmouse)
	390	{
203a6033 DT	391	struct trackpoint_data *tp = psmouse->private;
	392	int error;
	393	bool was_reset;
0c6a6165	394
203a6033 DT	395	error = trackpoint_start_protocol(psmouse, NULL, NULL);
	396	if (error)
	397	return error;
184dd275	398
203a6033 DT	399	was_reset = tp->variant_id == TP_VARIANT_IBM &&
	400	trackpoint_power_on_reset(&psmouse->ps2dev) == 0;
	401
	402	error = trackpoint_sync(psmouse, was_reset);
	403	if (error)
	404	return error;
184dd275 DT	405
	406	return 0;
	407	}
	408
b7802c5c	409	int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
541e316a	410	{
541e316a	411	struct ps2dev *ps2dev = &psmouse->ps2dev;
203a6033 DT	412	struct trackpoint_data *tp;
	413	u8 variant_id;
	414	u8 firmware_id;
	415	u8 button_info;
8ff22ea7	416	int error;
541e316a	417
203a6033 DT	418	error = trackpoint_start_protocol(psmouse, &variant_id, &firmware_id);
	419	if (error)
	420	return error;
541e316a SE	421
	422	if (!set_properties)
	423	return 0;
	424
203a6033 DT	425	tp = kzalloc(sizeof(*tp), GFP_KERNEL);
203a6033 DT	426	if (!tp)
6792cbbb	427	return -ENOMEM;
541e316a	428
203a6033 DT	429	trackpoint_defaults(tp);
	430	tp->variant_id = variant_id;
	431	tp->firmware_id = firmware_id;
	432
	433	psmouse->private = tp;
	434
	435	psmouse->vendor = trackpoint_variants[variant_id];
541e316a SE	436	psmouse->name = "TrackPoint";
541e316a SE	437
184dd275	438	psmouse->reconnect = trackpoint_reconnect;
541e316a SE	439	psmouse->disconnect = trackpoint_disconnect;
541e316a SE	440
203a6033 DT	441	if (variant_id != TP_VARIANT_IBM) {
	442	/* Newer variants do not support extended button query. */
	443	button_info = 0x33;
	444	} else {
	445	error = trackpoint_read(ps2dev, TP_EXT_BTN, &button_info);
	446	if (error) {
	447	psmouse_warn(psmouse,
	448	"failed to get extended button data, assuming 3 buttons\n");
	449	button_info = 0x33;
	450	} else if (!button_info) {
	451	psmouse_warn(psmouse,
	452	"got 0 in extended button data, assuming 3 buttons\n");
	453	button_info = 0x33;
	454	}
	455	}
	456
315eb996	457	if ((button_info & 0x0f) >= 3)
203a6033	458	input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
315eb996	459
01d4cd5c	460	__set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit);
7611392f HG	461	__set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);
7611392f HG	462
203a6033 DT	463	if (variant_id != TP_VARIANT_IBM \|\|
	464	trackpoint_power_on_reset(ps2dev) != 0) {
	465	/*
	466	* Write defaults to TP if we did not reset the trackpoint.
	467	*/
0c6a6165	468	trackpoint_sync(psmouse, false);
203a6033	469	}
541e316a	470
203a6033	471	error = device_add_group(&ps2dev->serio->dev, &trackpoint_attr_group);
8ff22ea7	472	if (error) {
fb16395e JD	473	psmouse_err(psmouse,
	474	"failed to create sysfs attributes, error: %d\n",
	475	error);
315eb996 DT	476	kfree(psmouse->private);
315eb996 DT	477	psmouse->private = NULL;
8ff22ea7 JG	478	return -1;
8ff22ea7 JG	479	}
541e316a	480
fb16395e	481	psmouse_info(psmouse,
203a6033 DT	482	"%s TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
203a6033 DT	483	psmouse->vendor, firmware_id,
fb16395e	484	(button_info & 0xf0) >> 4, button_info & 0x0f);
541e316a SE	485
	486	return 0;
	487	}
	488