[linux-2.6-block.git] / drivers / input / mouse / focaltech.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Focaltech TouchPad PS/2 mouse driver
 *
 * Copyright (c) 2014 Red Hat Inc.
 * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
 *
 * 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 = "Touchpad";
	}

	return 0;
}

#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(dev, BTN_LEFT, state->pressed);
	input_sync(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 += (s8)packet[1];
		state->fingers[finger1].y += (s8)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 += (s8)packet[4];
		state->fingers[finger2].y += (s8)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_reset(struct psmouse *psmouse)
{
	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
	psmouse_reset(psmouse);
}

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;
}

static 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(*priv), 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;
}
#endif /* CONFIG_MOUSE_PS2_FOCALTECH */
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
3ace3686 HG	2	/*
	3	* Focaltech TouchPad PS/2 mouse driver
	4	*
	5	* Copyright (c) 2014 Red Hat Inc.
05be1d07	6	* Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
3ace3686	7	*
3ace3686 HG	8	* Red Hat authors:
	9	*
	10	* Hans de Goede <hdegoede@redhat.com>
	11	*/
	12
3ace3686 HG	13
	14	#include <linux/device.h>
	15	#include <linux/libps2.h>
05be1d07 MG	16	#include <linux/input/mt.h>
	17	#include <linux/serio.h>
	18	#include <linux/slab.h>
3ace3686	19	#include "psmouse.h"
05be1d07	20	#include "focaltech.h"
3ace3686 HG	21
	22	static const char * const focaltech_pnp_ids[] = {
	23	"FLT0101",
	24	"FLT0102",
	25	"FLT0103",
	26	NULL
	27	};
	28
05be1d07 MG	29	/*
	30	* Even if the kernel is built without support for Focaltech PS/2 touchpads (or
	31	* when the real driver fails to recognize the device), we still have to detect
	32	* them in order to avoid further detection attempts confusing the touchpad.
	33	* This way it at least works in PS/2 mouse compatibility mode.
	34	*/
3ace3686 HG	35	int focaltech_detect(struct psmouse *psmouse, bool set_properties)
	36	{
	37	if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))
	38	return -ENODEV;
	39
	40	if (set_properties) {
	41	psmouse->vendor = "FocalTech";
324ae095	42	psmouse->name = "Touchpad";
3ace3686 HG	43	}
	44
	45	return 0;
	46	}
	47
05be1d07 MG	48	#ifdef CONFIG_MOUSE_PS2_FOCALTECH
	49
	50	/*
	51	* Packet types - the numbers are not consecutive, so we might be missing
	52	* something here.
	53	*/
	54	#define FOC_TOUCH 0x3 /* bitmap of active fingers */
	55	#define FOC_ABS 0x6 /* absolute position of one finger */
	56	#define FOC_REL 0x9 /* relative position of 1-2 fingers */
	57
	58	#define FOC_MAX_FINGERS 5
	59
05be1d07 MG	60	/*
	61	* Current state of a single finger on the touchpad.
	62	*/
	63	struct focaltech_finger_state {
	64	/* The touchpad has generated a touch event for the finger */
	65	bool active;
	66
	67	/*
	68	* The touchpad has sent position data for the finger. The
	69	* flag is 0 when the finger is not active, and there is a
	70	* time between the first touch event for the finger and the
	71	* following absolute position packet for the finger where the
	72	* touchpad has declared the finger to be valid, but we do not
	73	* have any valid position yet.
	74	*/
	75	bool valid;
	76
	77	/*
	78	* Absolute position (from the bottom left corner) of the
	79	* finger.
	80	*/
	81	unsigned int x;
	82	unsigned int y;
	83	};
	84
	85	/*
	86	* Description of the current state of the touchpad hardware.
	87	*/
	88	struct focaltech_hw_state {
	89	/*
	90	* The touchpad tracks the positions of the fingers for us,
	91	* the array indices correspond to the finger indices returned
	92	* in the report packages.
	93	*/
	94	struct focaltech_finger_state fingers[FOC_MAX_FINGERS];
	95
85919a00 DT	96	/*
	97	* Finger width 0-7 and 15 for a very big contact area.
	98	* 15 value stays until the finger is released.
	99	* Width is reported only in absolute packets.
	100	* Since hardware reports width only for last touching finger,
	101	* there is no need to store width for every specific finger,
	102	* so we keep only last value reported.
	103	*/
	104	unsigned int width;
	105
05be1d07 MG	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);
85919a00	140	input_report_abs(dev, ABS_TOOL_WIDTH, state->width);
05be1d07 MG	141	}
	142	}
	143	input_mt_report_pointer_emulation(dev, true);
	144
324ae095 DT	145	input_report_key(dev, BTN_LEFT, state->pressed);
324ae095 DT	146	input_sync(dev);
05be1d07 MG	147	}
	148
	149	static void focaltech_process_touch_packet(struct psmouse *psmouse,
	150	unsigned char *packet)
	151	{
	152	struct focaltech_data *priv = psmouse->private;
	153	struct focaltech_hw_state *state = &priv->state;
	154	unsigned char fingers = packet[1];
	155	int i;
	156
	157	state->pressed = (packet[0] >> 4) & 1;
	158
	159	/* the second byte contains a bitmap of all fingers touching the pad */
	160	for (i = 0; i < FOC_MAX_FINGERS; i++) {
	161	state->fingers[i].active = fingers & 0x1;
	162	if (!state->fingers[i].active) {
	163	/*
	164	* Even when the finger becomes active again, we still
	165	* will have to wait for the first valid position.
	166	*/
	167	state->fingers[i].valid = false;
	168	}
	169	fingers >>= 1;
	170	}
	171	}
	172
	173	static void focaltech_process_abs_packet(struct psmouse *psmouse,
	174	unsigned char *packet)
	175	{
	176	struct focaltech_data *priv = psmouse->private;
	177	struct focaltech_hw_state *state = &priv->state;
	178	unsigned int finger;
	179
	180	finger = (packet[1] >> 4) - 1;
	181	if (finger >= FOC_MAX_FINGERS) {
	182	psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
	183	finger);
	184	return;
	185	}
	186
	187	state->pressed = (packet[0] >> 4) & 1;
	188
05be1d07 MG	189	state->fingers[finger].x = ((packet[1] & 0xf) << 8) \| packet[2];
05be1d07 MG	190	state->fingers[finger].y = (packet[3] << 8) \| packet[4];
85919a00	191	state->width = packet[5] >> 4;
05be1d07 MG	192	state->fingers[finger].valid = true;
	193	}
	194
	195	static void focaltech_process_rel_packet(struct psmouse *psmouse,
	196	unsigned char *packet)
	197	{
	198	struct focaltech_data *priv = psmouse->private;
	199	struct focaltech_hw_state *state = &priv->state;
	200	int finger1, finger2;
	201
	202	state->pressed = packet[0] >> 7;
	203	finger1 = ((packet[0] >> 4) & 0x7) - 1;
	204	if (finger1 < FOC_MAX_FINGERS) {
8980f190 JD	205	state->fingers[finger1].x += (s8)packet[1];
8980f190 JD	206	state->fingers[finger1].y += (s8)packet[2];
05be1d07 MG	207	} else {
	208	psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
	209	finger1);
	210	}
	211
	212	/*
	213	* If there is an odd number of fingers, the last relative
	214	* packet only contains one finger. In this case, the second
	215	* finger index in the packet is 0 (we subtract 1 in the lines
	216	* above to create array indices, so the finger will overflow
	217	* and be above FOC_MAX_FINGERS).
	218	*/
	219	finger2 = ((packet[3] >> 4) & 0x7) - 1;
	220	if (finger2 < FOC_MAX_FINGERS) {
8980f190 JD	221	state->fingers[finger2].x += (s8)packet[4];
8980f190 JD	222	state->fingers[finger2].y += (s8)packet[5];
05be1d07 MG	223	}
	224	}
	225
	226	static void focaltech_process_packet(struct psmouse *psmouse)
	227	{
	228	unsigned char *packet = psmouse->packet;
	229
	230	switch (packet[0] & 0xf) {
	231	case FOC_TOUCH:
	232	focaltech_process_touch_packet(psmouse, packet);
	233	break;
	234
	235	case FOC_ABS:
	236	focaltech_process_abs_packet(psmouse, packet);
	237	break;
	238
	239	case FOC_REL:
	240	focaltech_process_rel_packet(psmouse, packet);
	241	break;
	242
	243	default:
	244	psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
	245	break;
	246	}
	247
	248	focaltech_report_state(psmouse);
	249	}
	250
	251	static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
	252	{
	253	if (psmouse->pktcnt >= 6) { /* Full packet received */
	254	focaltech_process_packet(psmouse);
	255	return PSMOUSE_FULL_PACKET;
	256	}
	257
	258	/*
	259	* We might want to do some validation of the data here, but
	260	* we do not know the protocol well enough
	261	*/
	262	return PSMOUSE_GOOD_DATA;
	263	}
	264
	265	static int focaltech_switch_protocol(struct psmouse *psmouse)
	266	{
	267	struct ps2dev *ps2dev = &psmouse->ps2dev;
	268	unsigned char param[3];
	269
	270	param[0] = 0;
	271	if (ps2_command(ps2dev, param, 0x10f8))
	272	return -EIO;
	273
	274	if (ps2_command(ps2dev, param, 0x10f8))
	275	return -EIO;
	276
	277	if (ps2_command(ps2dev, param, 0x10f8))
	278	return -EIO;
	279
	280	param[0] = 1;
	281	if (ps2_command(ps2dev, param, 0x10f8))
	282	return -EIO;
	283
	284	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
	285	return -EIO;
	286
287	if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
288	return -EIO;
289
290	return 0;
291	}
292
2b6f39e9 DT	293	static void focaltech_reset(struct psmouse *psmouse)
	294	{
	295	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
	296	psmouse_reset(psmouse);
	297	}
	298
05be1d07 MG	299	static void focaltech_disconnect(struct psmouse *psmouse)
	300	{
	301	focaltech_reset(psmouse);
	302	kfree(psmouse->private);
	303	psmouse->private = NULL;
	304	}
	305
	306	static int focaltech_reconnect(struct psmouse *psmouse)
	307	{
	308	int error;
	309
	310	focaltech_reset(psmouse);
	311
	312	error = focaltech_switch_protocol(psmouse);
	313	if (error) {
	314	psmouse_err(psmouse, "Unable to initialize the device\n");
	315	return error;
	316	}
	317
	318	return 0;
	319	}
	320
	321	static void focaltech_set_input_params(struct psmouse *psmouse)
	322	{
	323	struct input_dev *dev = psmouse->dev;
	324	struct focaltech_data *priv = psmouse->private;
	325
	326	/*
	327	* Undo part of setup done for us by psmouse core since touchpad
	328	* is not a relative device.
	329	*/
	330	__clear_bit(EV_REL, dev->evbit);
	331	__clear_bit(REL_X, dev->relbit);
	332	__clear_bit(REL_Y, dev->relbit);
	333	__clear_bit(BTN_RIGHT, dev->keybit);
	334	__clear_bit(BTN_MIDDLE, dev->keybit);
	335
	336	/*
	337	* Now set up our capabilities.
	338	*/
	339	__set_bit(EV_ABS, dev->evbit);
	340	input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
	341	input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
85919a00	342	input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
05be1d07 MG	343	input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
	344	__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
	345	}
	346
	347	static int focaltech_read_register(struct ps2dev *ps2dev, int reg,
	348	unsigned char *param)
	349	{
	350	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
	351	return -EIO;
	352
	353	param[0] = 0;
	354	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	355	return -EIO;
	356
	357	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	358	return -EIO;
	359
	360	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	361	return -EIO;
	362
	363	param[0] = reg;
	364	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
	365	return -EIO;
	366
	367	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
	368	return -EIO;
	369
	370	return 0;
	371	}
	372
	373	static int focaltech_read_size(struct psmouse *psmouse)
	374	{
	375	struct ps2dev *ps2dev = &psmouse->ps2dev;
	376	struct focaltech_data *priv = psmouse->private;
	377	char param[3];
	378
	379	if (focaltech_read_register(ps2dev, 2, param))
	380	return -EIO;
	381
	382	/* not sure whether this is 100% correct */
	383	priv->x_max = (unsigned char)param[1] * 128;
	384	priv->y_max = (unsigned char)param[2] * 128;
	385
	386	return 0;
	387	}
4ec212f0	388
db808498 BX	389	static void focaltech_set_resolution(struct psmouse *psmouse,
db808498 BX	390	unsigned int resolution)
4ec212f0 MG	391	{
	392	/* not supported yet */
	393	}
	394
	395	static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate)
	396	{
	397	/* not supported yet */
	398	}
	399
	400	static void focaltech_set_scale(struct psmouse *psmouse,
	401	enum psmouse_scale scale)
	402	{
	403	/* not supported yet */
	404	}
	405
05be1d07 MG	406	int focaltech_init(struct psmouse *psmouse)
	407	{
	408	struct focaltech_data *priv;
	409	int error;
	410
dc2f1423	411	psmouse->private = priv = kzalloc(sizeof(*priv), GFP_KERNEL);
05be1d07 MG	412	if (!priv)
	413	return -ENOMEM;
	414
	415	focaltech_reset(psmouse);
	416
	417	error = focaltech_read_size(psmouse);
	418	if (error) {
	419	psmouse_err(psmouse,
	420	"Unable to read the size of the touchpad\n");
	421	goto fail;
	422	}
	423
	424	error = focaltech_switch_protocol(psmouse);
	425	if (error) {
	426	psmouse_err(psmouse, "Unable to initialize the device\n");
	427	goto fail;
	428	}
	429
	430	focaltech_set_input_params(psmouse);
	431
	432	psmouse->protocol_handler = focaltech_process_byte;
	433	psmouse->pktsize = 6;
	434	psmouse->disconnect = focaltech_disconnect;
	435	psmouse->reconnect = focaltech_reconnect;
	436	psmouse->cleanup = focaltech_reset;
	437	/* resync is not supported yet */
	438	psmouse->resync_time = 0;
4ec212f0 MG	439	/*
	440	* rate/resolution/scale changes are not supported yet, and
	441	* the generic implementations of these functions seem to
	442	* confuse some touchpads
	443	*/
	444	psmouse->set_resolution = focaltech_set_resolution;
	445	psmouse->set_rate = focaltech_set_rate;
	446	psmouse->set_scale = focaltech_set_scale;
3ace3686 HG	447
3ace3686 HG	448	return 0;
05be1d07 MG	449
	450	fail:
	451	focaltech_reset(psmouse);
	452	kfree(priv);
	453	return error;
3ace3686	454	}
05be1d07	455	#endif /* CONFIG_MOUSE_PS2_FOCALTECH */