[deliverable/linux.git] / drivers / input / mouse / focaltech.c

/*
 * Focaltech TouchPad PS/2 mouse driver
 *
 * Copyright (c) 2014 Red Hat Inc.
 * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Red Hat authors:
 *
 * Hans de Goede <hdegoede@redhat.com>
 */


#include <linux/device.h>
#include <linux/libps2.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
#include <linux/slab.h>
#include "psmouse.h"
#include "focaltech.h"

static const char * const focaltech_pnp_ids[] = {
	"FLT0101",
	"FLT0102",
	"FLT0103",
	NULL
};

/*
 * Even if the kernel is built without support for Focaltech PS/2 touchpads (or
 * when the real driver fails to recognize the device), we still have to detect
 * them in order to avoid further detection attempts confusing the touchpad.
 * This way it at least works in PS/2 mouse compatibility mode.
 */
int focaltech_detect(struct psmouse *psmouse, bool set_properties)
{
	if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))
		return -ENODEV;

	if (set_properties) {
		psmouse->vendor = "FocalTech";
		psmouse->name = "FocalTech Touchpad";
	}

	return 0;
}

static void focaltech_reset(struct psmouse *psmouse)
{
	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
	psmouse_reset(psmouse);
}

#ifdef CONFIG_MOUSE_PS2_FOCALTECH

/*
 * Packet types - the numbers are not consecutive, so we might be missing
 * something here.
 */
#define FOC_TOUCH 0x3 /* bitmap of active fingers */
#define FOC_ABS 0x6 /* absolute position of one finger */
#define FOC_REL 0x9 /* relative position of 1-2 fingers */

#define FOC_MAX_FINGERS 5

/*
 * Current state of a single finger on the touchpad.
 */
struct focaltech_finger_state {
	/* The touchpad has generated a touch event for the finger */
	bool active;

	/*
	 * The touchpad has sent position data for the finger. The
	 * flag is 0 when the finger is not active, and there is a
	 * time between the first touch event for the finger and the
	 * following absolute position packet for the finger where the
	 * touchpad has declared the finger to be valid, but we do not
	 * have any valid position yet.
	 */
	bool valid;

	/*
	 * Absolute position (from the bottom left corner) of the
	 * finger.
	 */
	unsigned int x;
	unsigned int y;
};

/*
 * Description of the current state of the touchpad hardware.
 */
struct focaltech_hw_state {
	/*
	 * The touchpad tracks the positions of the fingers for us,
	 * the array indices correspond to the finger indices returned
	 * in the report packages.
	 */
	struct focaltech_finger_state fingers[FOC_MAX_FINGERS];

	/*
	 * Finger width 0-7 and 15 for a very big contact area.
	 * 15 value stays until the finger is released.
	 * Width is reported only in absolute packets.
	 * Since hardware reports width only for last touching finger,
	 * there is no need to store width for every specific finger,
	 * so we keep only last value reported.
	 */
	unsigned int width;

	/* True if the clickpad has been pressed. */
	bool pressed;
};

struct focaltech_data {
	unsigned int x_max, y_max;
	struct focaltech_hw_state state;
};

static void focaltech_report_state(struct psmouse *psmouse)
{
	struct focaltech_data *priv = psmouse->private;
	struct focaltech_hw_state *state = &priv->state;
	struct input_dev *dev = psmouse->dev;
	int i;

	for (i = 0; i < FOC_MAX_FINGERS; i++) {
		struct focaltech_finger_state *finger = &state->fingers[i];
		bool active = finger->active && finger->valid;

		input_mt_slot(dev, i);
		input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
		if (active) {
			unsigned int clamped_x, clamped_y;
			/*
			 * The touchpad might report invalid data, so we clamp
			 * the resulting values so that we do not confuse
			 * userspace.
			 */
			clamped_x = clamp(finger->x, 0U, priv->x_max);
			clamped_y = clamp(finger->y, 0U, priv->y_max);
			input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
			input_report_abs(dev, ABS_MT_POSITION_Y,
					 priv->y_max - clamped_y);
			input_report_abs(dev, ABS_TOOL_WIDTH, state->width);
		}
	}
	input_mt_report_pointer_emulation(dev, true);

	input_report_key(psmouse->dev, BTN_LEFT, state->pressed);
	input_sync(psmouse->dev);
}

static void focaltech_process_touch_packet(struct psmouse *psmouse,
					   unsigned char *packet)
{
	struct focaltech_data *priv = psmouse->private;
	struct focaltech_hw_state *state = &priv->state;
	unsigned char fingers = packet[1];
	int i;

	state->pressed = (packet[0] >> 4) & 1;

	/* the second byte contains a bitmap of all fingers touching the pad */
	for (i = 0; i < FOC_MAX_FINGERS; i++) {
		state->fingers[i].active = fingers & 0x1;
		if (!state->fingers[i].active) {
			/*
			 * Even when the finger becomes active again, we still
			 * will have to wait for the first valid position.
			 */
			state->fingers[i].valid = false;
		}
		fingers >>= 1;
	}
}

static void focaltech_process_abs_packet(struct psmouse *psmouse,
					 unsigned char *packet)
{
	struct focaltech_data *priv = psmouse->private;
	struct focaltech_hw_state *state = &priv->state;
	unsigned int finger;

	finger = (packet[1] >> 4) - 1;
	if (finger >= FOC_MAX_FINGERS) {
		psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
			    finger);
		return;
	}

	state->pressed = (packet[0] >> 4) & 1;

	state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
	state->fingers[finger].y = (packet[3] << 8) | packet[4];
	state->width = packet[5] >> 4;
	state->fingers[finger].valid = true;
}

static void focaltech_process_rel_packet(struct psmouse *psmouse,
					 unsigned char *packet)
{
	struct focaltech_data *priv = psmouse->private;
	struct focaltech_hw_state *state = &priv->state;
	int finger1, finger2;

	state->pressed = packet[0] >> 7;
	finger1 = ((packet[0] >> 4) & 0x7) - 1;
	if (finger1 < FOC_MAX_FINGERS) {
		state->fingers[finger1].x += (char)packet[1];
		state->fingers[finger1].y += (char)packet[2];
	} else {
		psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
			    finger1);
	}

	/*
	 * If there is an odd number of fingers, the last relative
	 * packet only contains one finger. In this case, the second
	 * finger index in the packet is 0 (we subtract 1 in the lines
	 * above to create array indices, so the finger will overflow
	 * and be above FOC_MAX_FINGERS).
	 */
	finger2 = ((packet[3] >> 4) & 0x7) - 1;
	if (finger2 < FOC_MAX_FINGERS) {
		state->fingers[finger2].x += (char)packet[4];
		state->fingers[finger2].y += (char)packet[5];
	}
}

static void focaltech_process_packet(struct psmouse *psmouse)
{
	unsigned char *packet = psmouse->packet;

	switch (packet[0] & 0xf) {
	case FOC_TOUCH:
		focaltech_process_touch_packet(psmouse, packet);
		break;

	case FOC_ABS:
		focaltech_process_abs_packet(psmouse, packet);
		break;

	case FOC_REL:
		focaltech_process_rel_packet(psmouse, packet);
		break;

	default:
		psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
		break;
	}

	focaltech_report_state(psmouse);
}

static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
{
	if (psmouse->pktcnt >= 6) { /* Full packet received */
		focaltech_process_packet(psmouse);
		return PSMOUSE_FULL_PACKET;
	}

	/*
	 * We might want to do some validation of the data here, but
	 * we do not know the protocol well enough
	 */
	return PSMOUSE_GOOD_DATA;
}

static int focaltech_switch_protocol(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[3];

	param[0] = 0;
	if (ps2_command(ps2dev, param, 0x10f8))
		return -EIO;

	if (ps2_command(ps2dev, param, 0x10f8))
		return -EIO;

	if (ps2_command(ps2dev, param, 0x10f8))
		return -EIO;

	param[0] = 1;
	if (ps2_command(ps2dev, param, 0x10f8))
		return -EIO;

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
		return -EIO;

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
		return -EIO;

	return 0;
}

static void focaltech_disconnect(struct psmouse *psmouse)
{
	focaltech_reset(psmouse);
	kfree(psmouse->private);
	psmouse->private = NULL;
}

static int focaltech_reconnect(struct psmouse *psmouse)
{
	int error;

	focaltech_reset(psmouse);

	error = focaltech_switch_protocol(psmouse);
	if (error) {
		psmouse_err(psmouse, "Unable to initialize the device\n");
		return error;
	}

	return 0;
}

static void focaltech_set_input_params(struct psmouse *psmouse)
{
	struct input_dev *dev = psmouse->dev;
	struct focaltech_data *priv = psmouse->private;

	/*
	 * Undo part of setup done for us by psmouse core since touchpad
	 * is not a relative device.
	 */
	__clear_bit(EV_REL, dev->evbit);
	__clear_bit(REL_X, dev->relbit);
	__clear_bit(REL_Y, dev->relbit);
	__clear_bit(BTN_RIGHT, dev->keybit);
	__clear_bit(BTN_MIDDLE, dev->keybit);

	/*
	 * Now set up our capabilities.
	 */
	__set_bit(EV_ABS, dev->evbit);
	input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
	input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
	input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
	input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
	__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
}

static int focaltech_read_register(struct ps2dev *ps2dev, int reg,
				   unsigned char *param)
{
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
		return -EIO;

	param[0] = 0;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -EIO;

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -EIO;

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -EIO;

	param[0] = reg;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -EIO;

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return -EIO;

	return 0;
}

static int focaltech_read_size(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	struct focaltech_data *priv = psmouse->private;
	char param[3];

	if (focaltech_read_register(ps2dev, 2, param))
		return -EIO;

	/* not sure whether this is 100% correct */
	priv->x_max = (unsigned char)param[1] * 128;
	priv->y_max = (unsigned char)param[2] * 128;

	return 0;
}

void focaltech_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
	/* not supported yet */
}

static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate)
{
	/* not supported yet */
}

static void focaltech_set_scale(struct psmouse *psmouse,
				enum psmouse_scale scale)
{
	/* not supported yet */
}

int focaltech_init(struct psmouse *psmouse)
{
	struct focaltech_data *priv;
	int error;

	psmouse->private = priv = kzalloc(sizeof(struct focaltech_data),
					  GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	focaltech_reset(psmouse);

	error = focaltech_read_size(psmouse);
	if (error) {
		psmouse_err(psmouse,
			    "Unable to read the size of the touchpad\n");
		goto fail;
	}

	error = focaltech_switch_protocol(psmouse);
	if (error) {
		psmouse_err(psmouse, "Unable to initialize the device\n");
		goto fail;
	}

	focaltech_set_input_params(psmouse);

	psmouse->protocol_handler = focaltech_process_byte;
	psmouse->pktsize = 6;
	psmouse->disconnect = focaltech_disconnect;
	psmouse->reconnect = focaltech_reconnect;
	psmouse->cleanup = focaltech_reset;
	/* resync is not supported yet */
	psmouse->resync_time = 0;
	/*
	 * rate/resolution/scale changes are not supported yet, and
	 * the generic implementations of these functions seem to
	 * confuse some touchpads
	 */
	psmouse->set_resolution = focaltech_set_resolution;
	psmouse->set_rate = focaltech_set_rate;
	psmouse->set_scale = focaltech_set_scale;

	return 0;

fail:
	focaltech_reset(psmouse);
	kfree(priv);
	return error;
}

#else /* CONFIG_MOUSE_PS2_FOCALTECH */

int focaltech_init(struct psmouse *psmouse)
{
	focaltech_reset(psmouse);

	return 0;
}

#endif /* CONFIG_MOUSE_PS2_FOCALTECH */
Commit	Line	Data
3ace3686 HG	1	/*
	2	* Focaltech TouchPad PS/2 mouse driver
	3	*
	4	* Copyright (c) 2014 Red Hat Inc.
05be1d07	5	* Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
3ace3686 HG	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* Red Hat authors:
	13	*
	14	* Hans de Goede <hdegoede@redhat.com>
	15	*/
	16
3ace3686 HG	17
	18	#include <linux/device.h>
	19	#include <linux/libps2.h>
05be1d07 MG	20	#include <linux/input/mt.h>
	21	#include <linux/serio.h>
	22	#include <linux/slab.h>
3ace3686	23	#include "psmouse.h"
05be1d07	24	#include "focaltech.h"
3ace3686 HG	25
	26	static const char * const focaltech_pnp_ids[] = {
	27	"FLT0101",
	28	"FLT0102",
	29	"FLT0103",
	30	NULL
	31	};
	32
05be1d07 MG	33	/*
	34	* Even if the kernel is built without support for Focaltech PS/2 touchpads (or
	35	* when the real driver fails to recognize the device), we still have to detect
	36	* them in order to avoid further detection attempts confusing the touchpad.
	37	* This way it at least works in PS/2 mouse compatibility mode.
	38	*/
3ace3686 HG	39	int focaltech_detect(struct psmouse *psmouse, bool set_properties)
	40	{
	41	if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))
	42	return -ENODEV;
	43
	44	if (set_properties) {
	45	psmouse->vendor = "FocalTech";
05be1d07	46	psmouse->name = "FocalTech Touchpad";
3ace3686 HG	47	}
	48
	49	return 0;
	50	}
	51
05be1d07	52	static void focaltech_reset(struct psmouse *psmouse)
3ace3686 HG	53	{
	54	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
	55	psmouse_reset(psmouse);
05be1d07 MG	56	}
	57
	58	#ifdef CONFIG_MOUSE_PS2_FOCALTECH
	59
	60	/*
	61	* Packet types - the numbers are not consecutive, so we might be missing
	62	* something here.
	63	*/
	64	#define FOC_TOUCH 0x3 /* bitmap of active fingers */
	65	#define FOC_ABS 0x6 /* absolute position of one finger */
	66	#define FOC_REL 0x9 /* relative position of 1-2 fingers */
	67
	68	#define FOC_MAX_FINGERS 5
	69
05be1d07 MG	70	/*
	71	* Current state of a single finger on the touchpad.
	72	*/
	73	struct focaltech_finger_state {
	74	/* The touchpad has generated a touch event for the finger */
	75	bool active;
	76
	77	/*
	78	* The touchpad has sent position data for the finger. The
	79	* flag is 0 when the finger is not active, and there is a
	80	* time between the first touch event for the finger and the
	81	* following absolute position packet for the finger where the
	82	* touchpad has declared the finger to be valid, but we do not
	83	* have any valid position yet.
	84	*/
	85	bool valid;
	86
	87	/*
	88	* Absolute position (from the bottom left corner) of the
	89	* finger.
	90	*/
	91	unsigned int x;
	92	unsigned int y;
	93	};
	94
	95	/*
	96	* Description of the current state of the touchpad hardware.
	97	*/
	98	struct focaltech_hw_state {
	99	/*
	100	* The touchpad tracks the positions of the fingers for us,
	101	* the array indices correspond to the finger indices returned
	102	* in the report packages.
	103	*/
	104	struct focaltech_finger_state fingers[FOC_MAX_FINGERS];
	105
85919a00 DT	106	/*
	107	* Finger width 0-7 and 15 for a very big contact area.
	108	* 15 value stays until the finger is released.
	109	* Width is reported only in absolute packets.
	110	* Since hardware reports width only for last touching finger,
	111	* there is no need to store width for every specific finger,
	112	* so we keep only last value reported.
	113	*/
	114	unsigned int width;
	115
05be1d07 MG	116	/* True if the clickpad has been pressed. */
	117	bool pressed;
	118	};
	119
	120	struct focaltech_data {
	121	unsigned int x_max, y_max;
	122	struct focaltech_hw_state state;
	123	};
	124
	125	static void focaltech_report_state(struct psmouse *psmouse)
	126	{
	127	struct focaltech_data *priv = psmouse->private;
	128	struct focaltech_hw_state *state = &priv->state;
	129	struct input_dev *dev = psmouse->dev;
	130	int i;
	131
	132	for (i = 0; i < FOC_MAX_FINGERS; i++) {
	133	struct focaltech_finger_state *finger = &state->fingers[i];
	134	bool active = finger->active && finger->valid;
	135
	136	input_mt_slot(dev, i);
	137	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
	138	if (active) {
679d83ea MG	139	unsigned int clamped_x, clamped_y;
	140	/*
	141	* The touchpad might report invalid data, so we clamp
	142	* the resulting values so that we do not confuse
	143	* userspace.
	144	*/
	145	clamped_x = clamp(finger->x, 0U, priv->x_max);
	146	clamped_y = clamp(finger->y, 0U, priv->y_max);
	147	input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
05be1d07	148	input_report_abs(dev, ABS_MT_POSITION_Y,
679d83ea	149	priv->y_max - clamped_y);
85919a00	150	input_report_abs(dev, ABS_TOOL_WIDTH, state->width);
05be1d07 MG	151	}
	152	}
	153	input_mt_report_pointer_emulation(dev, true);
	154
	155	input_report_key(psmouse->dev, BTN_LEFT, state->pressed);
	156	input_sync(psmouse->dev);
	157	}
	158
	159	static void focaltech_process_touch_packet(struct psmouse *psmouse,
	160	unsigned char *packet)
	161	{
	162	struct focaltech_data *priv = psmouse->private;
	163	struct focaltech_hw_state *state = &priv->state;
	164	unsigned char fingers = packet[1];
	165	int i;
	166
	167	state->pressed = (packet[0] >> 4) & 1;
	168
	169	/* the second byte contains a bitmap of all fingers touching the pad */
	170	for (i = 0; i < FOC_MAX_FINGERS; i++) {
	171	state->fingers[i].active = fingers & 0x1;
	172	if (!state->fingers[i].active) {
	173	/*
	174	* Even when the finger becomes active again, we still
	175	* will have to wait for the first valid position.
	176	*/
	177	state->fingers[i].valid = false;
	178	}
	179	fingers >>= 1;
	180	}
	181	}
	182
	183	static void focaltech_process_abs_packet(struct psmouse *psmouse,
	184	unsigned char *packet)
	185	{
	186	struct focaltech_data *priv = psmouse->private;
	187	struct focaltech_hw_state *state = &priv->state;
	188	unsigned int finger;
	189
	190	finger = (packet[1] >> 4) - 1;
	191	if (finger >= FOC_MAX_FINGERS) {
	192	psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
	193	finger);
	194	return;
	195	}
	196
	197	state->pressed = (packet[0] >> 4) & 1;
	198
05be1d07 MG	199	state->fingers[finger].x = ((packet[1] & 0xf) << 8) \| packet[2];
05be1d07 MG	200	state->fingers[finger].y = (packet[3] << 8) \| packet[4];
85919a00	201	state->width = packet[5] >> 4;
05be1d07 MG	202	state->fingers[finger].valid = true;
	203	}
	204
	205	static void focaltech_process_rel_packet(struct psmouse *psmouse,
	206	unsigned char *packet)
	207	{
	208	struct focaltech_data *priv = psmouse->private;
	209	struct focaltech_hw_state *state = &priv->state;
	210	int finger1, finger2;
	211
	212	state->pressed = packet[0] >> 7;
	213	finger1 = ((packet[0] >> 4) & 0x7) - 1;
	214	if (finger1 < FOC_MAX_FINGERS) {
	215	state->fingers[finger1].x += (char)packet[1];
	216	state->fingers[finger1].y += (char)packet[2];
	217	} else {
	218	psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
	219	finger1);
	220	}
	221
	222	/*
	223	* If there is an odd number of fingers, the last relative
	224	* packet only contains one finger. In this case, the second
	225	* finger index in the packet is 0 (we subtract 1 in the lines
	226	* above to create array indices, so the finger will overflow
	227	* and be above FOC_MAX_FINGERS).
	228	*/
	229	finger2 = ((packet[3] >> 4) & 0x7) - 1;
	230	if (finger2 < FOC_MAX_FINGERS) {
	231	state->fingers[finger2].x += (char)packet[4];
	232	state->fingers[finger2].y += (char)packet[5];
	233	}
	234	}
	235
	236	static void focaltech_process_packet(struct psmouse *psmouse)
	237	{
	238	unsigned char *packet = psmouse->packet;
	239
	240	switch (packet[0] & 0xf) {
	241	case FOC_TOUCH:
	242	focaltech_process_touch_packet(psmouse, packet);
	243	break;
	244
	245	case FOC_ABS:
	246	focaltech_process_abs_packet(psmouse, packet);
	247	break;
	248
	249	case FOC_REL:
	250	focaltech_process_rel_packet(psmouse, packet);
	251	break;
	252
	253	default:
	254	psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
	255	break;
	256	}
	257
	258	focaltech_report_state(psmouse);
	259	}
	260
	261	static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
	262	{
	263	if (psmouse->pktcnt >= 6) { /* Full packet received */
	264	focaltech_process_packet(psmouse);
	265	return PSMOUSE_FULL_PACKET;
266	}
267
268	/*
269	* We might want to do some validation of the data here, but
270	* we do not know the protocol well enough
271	*/
272	return PSMOUSE_GOOD_DATA;
273	}
274
275	static int focaltech_switch_protocol(struct psmouse *psmouse)
276	{
277	struct ps2dev *ps2dev = &psmouse->ps2dev;
278	unsigned char param[3];
279
280	param[0] = 0;
281	if (ps2_command(ps2dev, param, 0x10f8))
282	return -EIO;
283
284	if (ps2_command(ps2dev, param, 0x10f8))
285	return -EIO;
286
287	if (ps2_command(ps2dev, param, 0x10f8))
288	return -EIO;
289
290	param[0] = 1;
291	if (ps2_command(ps2dev, param, 0x10f8))
292	return -EIO;
293
294	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
295	return -EIO;
296
297	if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
298	return -EIO;
299
300	return 0;
301	}
302
303	static void focaltech_disconnect(struct psmouse *psmouse)
304	{
305	focaltech_reset(psmouse);
306	kfree(psmouse->private);
307	psmouse->private = NULL;
308	}
309
310	static int focaltech_reconnect(struct psmouse *psmouse)
311	{
312	int error;
313
314	focaltech_reset(psmouse);
315
316	error = focaltech_switch_protocol(psmouse);
317	if (error) {
318	psmouse_err(psmouse, "Unable to initialize the device\n");
319	return error;
320	}
321
322	return 0;
323	}
324
325	static void focaltech_set_input_params(struct psmouse *psmouse)
326	{
327	struct input_dev *dev = psmouse->dev;
328	struct focaltech_data *priv = psmouse->private;
329
330	/*
331	* Undo part of setup done for us by psmouse core since touchpad
332	* is not a relative device.
333	*/
334	__clear_bit(EV_REL, dev->evbit);
335	__clear_bit(REL_X, dev->relbit);
336	__clear_bit(REL_Y, dev->relbit);
337	__clear_bit(BTN_RIGHT, dev->keybit);
338	__clear_bit(BTN_MIDDLE, dev->keybit);
339
340	/*
341	* Now set up our capabilities.
342	*/
343	__set_bit(EV_ABS, dev->evbit);
344	input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
345	input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
85919a00	346	input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
05be1d07 MG	347	input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
	348	__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
	349	}
	350
	351	static int focaltech_read_register(struct ps2dev *ps2dev, int reg,
	352	unsigned char *param)
	353	{
	354	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
	355	return -EIO;
	356
	357	param[0] = 0;
	358	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	359	return -EIO;
	360
	361	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	362	return -EIO;
	363
	364	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	365	return -EIO;
	366
	367	param[0] = reg;
	368	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	369	return -EIO;
	370
	371	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
	372	return -EIO;
	373
	374	return 0;
	375	}
	376
	377	static int focaltech_read_size(struct psmouse *psmouse)
	378	{
	379	struct ps2dev *ps2dev = &psmouse->ps2dev;
	380	struct focaltech_data *priv = psmouse->private;
	381	char param[3];
	382
	383	if (focaltech_read_register(ps2dev, 2, param))
	384	return -EIO;
	385
	386	/* not sure whether this is 100% correct */
	387	priv->x_max = (unsigned char)param[1] * 128;
	388	priv->y_max = (unsigned char)param[2] * 128;
	389
	390	return 0;
	391	}
4ec212f0 MG	392
	393	void focaltech_set_resolution(struct psmouse *psmouse, unsigned int resolution)
	394	{
	395	/* not supported yet */
	396	}
	397
	398	static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate)
	399	{
	400	/* not supported yet */
	401	}
	402
	403	static void focaltech_set_scale(struct psmouse *psmouse,
	404	enum psmouse_scale scale)
	405	{
	406	/* not supported yet */
	407	}
	408
05be1d07 MG	409	int focaltech_init(struct psmouse *psmouse)
	410	{
	411	struct focaltech_data *priv;
	412	int error;
	413
	414	psmouse->private = priv = kzalloc(sizeof(struct focaltech_data),
	415	GFP_KERNEL);
	416	if (!priv)
	417	return -ENOMEM;
	418
	419	focaltech_reset(psmouse);
	420
	421	error = focaltech_read_size(psmouse);
	422	if (error) {
	423	psmouse_err(psmouse,
	424	"Unable to read the size of the touchpad\n");
	425	goto fail;
	426	}
	427
	428	error = focaltech_switch_protocol(psmouse);
	429	if (error) {
	430	psmouse_err(psmouse, "Unable to initialize the device\n");
	431	goto fail;
	432	}
	433
	434	focaltech_set_input_params(psmouse);
	435
	436	psmouse->protocol_handler = focaltech_process_byte;
	437	psmouse->pktsize = 6;
	438	psmouse->disconnect = focaltech_disconnect;
	439	psmouse->reconnect = focaltech_reconnect;
	440	psmouse->cleanup = focaltech_reset;
	441	/* resync is not supported yet */
	442	psmouse->resync_time = 0;
4ec212f0 MG	443	/*
	444	* rate/resolution/scale changes are not supported yet, and
	445	* the generic implementations of these functions seem to
	446	* confuse some touchpads
	447	*/
	448	psmouse->set_resolution = focaltech_set_resolution;
	449	psmouse->set_rate = focaltech_set_rate;
	450	psmouse->set_scale = focaltech_set_scale;
3ace3686 HG	451
3ace3686 HG	452	return 0;
05be1d07 MG	453
	454	fail:
	455	focaltech_reset(psmouse);
	456	kfree(priv);
	457	return error;
3ace3686	458	}
05be1d07	459
05be1d07 MG	460	#else /* CONFIG_MOUSE_PS2_FOCALTECH */
	461
	462	int focaltech_init(struct psmouse *psmouse)
	463	{
	464	focaltech_reset(psmouse);
	465
	466	return 0;
	467	}
	468
05be1d07	469	#endif /* CONFIG_MOUSE_PS2_FOCALTECH */