[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];

	/* 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_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->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_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
	106	/* True if the clickpad has been pressed. */
	107	bool pressed;
	108	};
	109
	110	struct focaltech_data {
	111	unsigned int x_max, y_max;
	112	struct focaltech_hw_state state;
	113	};
	114
	115	static void focaltech_report_state(struct psmouse *psmouse)
	116	{
	117	struct focaltech_data *priv = psmouse->private;
	118	struct focaltech_hw_state *state = &priv->state;
	119	struct input_dev *dev = psmouse->dev;
	120	int i;
	121
	122	for (i = 0; i < FOC_MAX_FINGERS; i++) {
	123	struct focaltech_finger_state *finger = &state->fingers[i];
	124	bool active = finger->active && finger->valid;
	125
	126	input_mt_slot(dev, i);
	127	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
	128	if (active) {
679d83ea MG	129	unsigned int clamped_x, clamped_y;
	130	/*
	131	* The touchpad might report invalid data, so we clamp
	132	* the resulting values so that we do not confuse
	133	* userspace.
	134	*/
	135	clamped_x = clamp(finger->x, 0U, priv->x_max);
	136	clamped_y = clamp(finger->y, 0U, priv->y_max);
	137	input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
05be1d07	138	input_report_abs(dev, ABS_MT_POSITION_Y,
679d83ea	139	priv->y_max - clamped_y);
05be1d07 MG	140	}
	141	}
	142	input_mt_report_pointer_emulation(dev, true);
	143
	144	input_report_key(psmouse->dev, BTN_LEFT, state->pressed);
	145	input_sync(psmouse->dev);
	146	}
	147
	148	static void focaltech_process_touch_packet(struct psmouse *psmouse,
	149	unsigned char *packet)
	150	{
	151	struct focaltech_data *priv = psmouse->private;
	152	struct focaltech_hw_state *state = &priv->state;
	153	unsigned char fingers = packet[1];
	154	int i;
	155
	156	state->pressed = (packet[0] >> 4) & 1;
	157
	158	/* the second byte contains a bitmap of all fingers touching the pad */
	159	for (i = 0; i < FOC_MAX_FINGERS; i++) {
	160	state->fingers[i].active = fingers & 0x1;
	161	if (!state->fingers[i].active) {
	162	/*
	163	* Even when the finger becomes active again, we still
	164	* will have to wait for the first valid position.
	165	*/
	166	state->fingers[i].valid = false;
	167	}
	168	fingers >>= 1;
	169	}
	170	}
	171
	172	static void focaltech_process_abs_packet(struct psmouse *psmouse,
	173	unsigned char *packet)
	174	{
	175	struct focaltech_data *priv = psmouse->private;
	176	struct focaltech_hw_state *state = &priv->state;
	177	unsigned int finger;
	178
	179	finger = (packet[1] >> 4) - 1;
	180	if (finger >= FOC_MAX_FINGERS) {
	181	psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
	182	finger);
	183	return;
	184	}
	185
	186	state->pressed = (packet[0] >> 4) & 1;
	187
05be1d07 MG	188	state->fingers[finger].x = ((packet[1] & 0xf) << 8) \| packet[2];
	189	state->fingers[finger].y = (packet[3] << 8) \| packet[4];
	190	state->fingers[finger].valid = true;
	191	}
	192
	193	static void focaltech_process_rel_packet(struct psmouse *psmouse,
	194	unsigned char *packet)
	195	{
	196	struct focaltech_data *priv = psmouse->private;
	197	struct focaltech_hw_state *state = &priv->state;
	198	int finger1, finger2;
	199
	200	state->pressed = packet[0] >> 7;
	201	finger1 = ((packet[0] >> 4) & 0x7) - 1;
	202	if (finger1 < FOC_MAX_FINGERS) {
	203	state->fingers[finger1].x += (char)packet[1];
	204	state->fingers[finger1].y += (char)packet[2];
	205	} else {
	206	psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
	207	finger1);
	208	}
	209
	210	/*
	211	* If there is an odd number of fingers, the last relative
	212	* packet only contains one finger. In this case, the second
	213	* finger index in the packet is 0 (we subtract 1 in the lines
	214	* above to create array indices, so the finger will overflow
	215	* and be above FOC_MAX_FINGERS).
	216	*/
	217	finger2 = ((packet[3] >> 4) & 0x7) - 1;
	218	if (finger2 < FOC_MAX_FINGERS) {
	219	state->fingers[finger2].x += (char)packet[4];
	220	state->fingers[finger2].y += (char)packet[5];
	221	}
	222	}
	223
	224	static void focaltech_process_packet(struct psmouse *psmouse)
	225	{
	226	unsigned char *packet = psmouse->packet;
	227
	228	switch (packet[0] & 0xf) {
	229	case FOC_TOUCH:
	230	focaltech_process_touch_packet(psmouse, packet);
	231	break;
	232
	233	case FOC_ABS:
	234	focaltech_process_abs_packet(psmouse, packet);
	235	break;
	236
	237	case FOC_REL:
	238	focaltech_process_rel_packet(psmouse, packet);
	239	break;
	240
	241	default:
	242	psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
	243	break;
	244	}
	245
	246	focaltech_report_state(psmouse);
	247	}
	248
	249	static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
	250	{
	251	if (psmouse->pktcnt >= 6) { /* Full packet received */
252	focaltech_process_packet(psmouse);
253	return PSMOUSE_FULL_PACKET;
254	}
255
256	/*
257	* We might want to do some validation of the data here, but
258	* we do not know the protocol well enough
259	*/
260	return PSMOUSE_GOOD_DATA;
261	}
262
263	static int focaltech_switch_protocol(struct psmouse *psmouse)
264	{
265	struct ps2dev *ps2dev = &psmouse->ps2dev;
266	unsigned char param[3];
267
268	param[0] = 0;
269	if (ps2_command(ps2dev, param, 0x10f8))
270	return -EIO;
271
272	if (ps2_command(ps2dev, param, 0x10f8))
273	return -EIO;
274
275	if (ps2_command(ps2dev, param, 0x10f8))
276	return -EIO;
277
278	param[0] = 1;
279	if (ps2_command(ps2dev, param, 0x10f8))
280	return -EIO;
281
282	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
283	return -EIO;
284
285	if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
286	return -EIO;
287
288	return 0;
289	}
290
291	static void focaltech_disconnect(struct psmouse *psmouse)
292	{
293	focaltech_reset(psmouse);
294	kfree(psmouse->private);
295	psmouse->private = NULL;
296	}
297
298	static int focaltech_reconnect(struct psmouse *psmouse)
299	{
300	int error;
301
302	focaltech_reset(psmouse);
303
304	error = focaltech_switch_protocol(psmouse);
305	if (error) {
306	psmouse_err(psmouse, "Unable to initialize the device\n");
307	return error;
308	}
309
310	return 0;
311	}
312
313	static void focaltech_set_input_params(struct psmouse *psmouse)
314	{
315	struct input_dev *dev = psmouse->dev;
316	struct focaltech_data *priv = psmouse->private;
317
318	/*
319	* Undo part of setup done for us by psmouse core since touchpad
320	* is not a relative device.
321	*/
322	__clear_bit(EV_REL, dev->evbit);
323	__clear_bit(REL_X, dev->relbit);
324	__clear_bit(REL_Y, dev->relbit);
325	__clear_bit(BTN_RIGHT, dev->keybit);
326	__clear_bit(BTN_MIDDLE, dev->keybit);
327
328	/*
329	* Now set up our capabilities.
330	*/
331	__set_bit(EV_ABS, dev->evbit);
332	input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
333	input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
334	input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
335	__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
336	}
337
338	static int focaltech_read_register(struct ps2dev *ps2dev, int reg,
339	unsigned char *param)
340	{
341	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
342	return -EIO;
343
344	param[0] = 0;
345	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
346	return -EIO;
347
348	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
349	return -EIO;
350
351	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
352	return -EIO;
353
354	param[0] = reg;
355	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
356	return -EIO;
357
358	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
359	return -EIO;
360
361	return 0;
362	}
363
364	static int focaltech_read_size(struct psmouse *psmouse)
365	{
366	struct ps2dev *ps2dev = &psmouse->ps2dev;
367	struct focaltech_data *priv = psmouse->private;
368	char param[3];
369
370	if (focaltech_read_register(ps2dev, 2, param))
371	return -EIO;
372
373	/* not sure whether this is 100% correct */
374	priv->x_max = (unsigned char)param[1] * 128;
375	priv->y_max = (unsigned char)param[2] * 128;
376
377	return 0;
378	}
4ec212f0 MG	379
	380	void focaltech_set_resolution(struct psmouse *psmouse, unsigned int resolution)
	381	{
	382	/* not supported yet */
	383	}
	384
	385	static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate)
	386	{
	387	/* not supported yet */
	388	}
	389
	390	static void focaltech_set_scale(struct psmouse *psmouse,
	391	enum psmouse_scale scale)
	392	{
	393	/* not supported yet */
	394	}
	395
05be1d07 MG	396	int focaltech_init(struct psmouse *psmouse)
	397	{
	398	struct focaltech_data *priv;
	399	int error;
	400
	401	psmouse->private = priv = kzalloc(sizeof(struct focaltech_data),
	402	GFP_KERNEL);
	403	if (!priv)
	404	return -ENOMEM;
	405
	406	focaltech_reset(psmouse);
	407
	408	error = focaltech_read_size(psmouse);
	409	if (error) {
	410	psmouse_err(psmouse,
	411	"Unable to read the size of the touchpad\n");
	412	goto fail;
	413	}
	414
	415	error = focaltech_switch_protocol(psmouse);
	416	if (error) {
	417	psmouse_err(psmouse, "Unable to initialize the device\n");
	418	goto fail;
	419	}
	420
	421	focaltech_set_input_params(psmouse);
	422
	423	psmouse->protocol_handler = focaltech_process_byte;
	424	psmouse->pktsize = 6;
	425	psmouse->disconnect = focaltech_disconnect;
	426	psmouse->reconnect = focaltech_reconnect;
	427	psmouse->cleanup = focaltech_reset;
	428	/* resync is not supported yet */
	429	psmouse->resync_time = 0;
4ec212f0 MG	430	/*
	431	* rate/resolution/scale changes are not supported yet, and
	432	* the generic implementations of these functions seem to
	433	* confuse some touchpads
	434	*/
	435	psmouse->set_resolution = focaltech_set_resolution;
	436	psmouse->set_rate = focaltech_set_rate;
	437	psmouse->set_scale = focaltech_set_scale;
3ace3686 HG	438
3ace3686 HG	439	return 0;
05be1d07 MG	440
	441	fail:
	442	focaltech_reset(psmouse);
	443	kfree(priv);
	444	return error;
3ace3686	445	}
05be1d07	446
05be1d07 MG	447	#else /* CONFIG_MOUSE_PS2_FOCALTECH */
	448
	449	int focaltech_init(struct psmouse *psmouse)
	450	{
	451	focaltech_reset(psmouse);
	452
	453	return 0;
	454	}
	455
05be1d07	456	#endif /* CONFIG_MOUSE_PS2_FOCALTECH */