/*
 * Fujitsu B-series Lifebook PS/2 TouchScreen driver
 *
 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
 * Copyright (c) 2005 Kenan Esau <kenan.esau@conan.de>
 *
 * TouchScreen detection, absolute mode setting and packet layout is taken from
 * Harald Hoyer's description of the device.
 *
 * 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.
 */

#include <linux/input.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include <linux/dmi.h>
#include <linux/slab.h>

#include "psmouse.h"
#include "lifebook.h"

struct lifebook_data {
	struct input_dev *dev2;		/* Relative device */
	char phys[32];
};

static bool lifebook_present;

static const char *desired_serio_phys;

static int lifebook_limit_serio3(const struct dmi_system_id *d)
{
	desired_serio_phys = "isa0060/serio3";
	return 1;
}

static bool lifebook_use_6byte_proto;

static int lifebook_set_6byte_proto(const struct dmi_system_id *d)
{
	lifebook_use_6byte_proto = true;
	return 1;
}

static const struct dmi_system_id lifebook_dmi_table[] __initconst = {
	{
		/* FLORA-ie 55mi */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "FLORA-ie 55mi"),
		},
	},
	{
		/* LifeBook B */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "Lifebook B Series"),
		},
	},
	{
		/* LifeBook B */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook B Series"),
		},
	},
	{
		/* Lifebook B */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK B Series"),
		},
	},
	{
		/* Lifebook B-2130 */
		.matches = {
			DMI_MATCH(DMI_BOARD_NAME, "ZEPHYR"),
		},
	},
	{
		/* Lifebook B213x/B2150 */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook B2131/B2133/B2150"),
		},
	},
	{
		/* Zephyr */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "ZEPHYR"),
		},
	},
	{
		/* Panasonic CF-18 */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "CF-18"),
		},
		.callback = lifebook_limit_serio3,
	},
	{
		/* Panasonic CF-28 */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Matsushita"),
			DMI_MATCH(DMI_PRODUCT_NAME, "CF-28"),
		},
		.callback = lifebook_set_6byte_proto,
	},
	{
		/* Panasonic CF-29 */
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Matsushita"),
			DMI_MATCH(DMI_PRODUCT_NAME, "CF-29"),
		},
		.callback = lifebook_set_6byte_proto,
	},
	{
		/* Panasonic CF-72 */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "CF-72"),
		},
		.callback = lifebook_set_6byte_proto,
	},
	{
		/* Lifebook B142 */
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook B142"),
		},
	},
	{ }
};

void __init lifebook_module_init(void)
{
	lifebook_present = dmi_check_system(lifebook_dmi_table);
}

static psmouse_ret_t lifebook_process_byte(struct psmouse *psmouse)
{
	struct lifebook_data *priv = psmouse->private;
	struct input_dev *dev1 = psmouse->dev;
	struct input_dev *dev2 = priv ? priv->dev2 : NULL;
	unsigned char *packet = psmouse->packet;
	bool relative_packet = packet[0] & 0x08;

	if (relative_packet || !lifebook_use_6byte_proto) {
		if (psmouse->pktcnt != 3)
			return PSMOUSE_GOOD_DATA;
	} else {
		switch (psmouse->pktcnt) {
		case 1:
			return (packet[0] & 0xf8) == 0x00 ?
				PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
		case 2:
			return PSMOUSE_GOOD_DATA;
		case 3:
			return ((packet[2] & 0x30) << 2) == (packet[2] & 0xc0) ?
				PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
		case 4:
			return (packet[3] & 0xf8) == 0xc0 ?
				PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
		case 5:
			return (packet[4] & 0xc0) == (packet[2] & 0xc0) ?
				PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
		case 6:
			if (((packet[5] & 0x30) << 2) != (packet[5] & 0xc0))
				return PSMOUSE_BAD_DATA;
			if ((packet[5] & 0xc0) != (packet[1] & 0xc0))
				return PSMOUSE_BAD_DATA;
			break; /* report data */
		}
	}

	if (relative_packet) {
		if (!dev2)
			psmouse_warn(psmouse,
				     "got relative packet but no relative device set up\n");
	} else {
		if (lifebook_use_6byte_proto) {
			input_report_abs(dev1, ABS_X,
				((packet[1] & 0x3f) << 6) | (packet[2] & 0x3f));
			input_report_abs(dev1, ABS_Y,
				4096 - (((packet[4] & 0x3f) << 6) | (packet[5] & 0x3f)));
		} else {
			input_report_abs(dev1, ABS_X,
				(packet[1] | ((packet[0] & 0x30) << 4)));
			input_report_abs(dev1, ABS_Y,
				1024 - (packet[2] | ((packet[0] & 0xC0) << 2)));
		}
		input_report_key(dev1, BTN_TOUCH, packet[0] & 0x04);
		input_sync(dev1);
	}

	if (dev2) {
		if (relative_packet) {
			input_report_rel(dev2, REL_X,
				((packet[0] & 0x10) ? packet[1] - 256 : packet[1]));
			input_report_rel(dev2, REL_Y,
				 -(int)((packet[0] & 0x20) ? packet[2] - 256 : packet[2]));
		}
		input_report_key(dev2, BTN_LEFT, packet[0] & 0x01);
		input_report_key(dev2, BTN_RIGHT, packet[0] & 0x02);
		input_sync(dev2);
	}

	return PSMOUSE_FULL_PACKET;
}

static int lifebook_absolute_mode(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param;

	if (psmouse_reset(psmouse))
		return -1;

	/*
	 * Enable absolute output -- ps2_command fails always but if
	 * you leave this call out the touchscreen will never send
	 * absolute coordinates
	 */
	param = lifebook_use_6byte_proto ? 0x08 : 0x07;
	ps2_command(ps2dev, &param, PSMOUSE_CMD_SETRES);

	return 0;
}

static void lifebook_relative_mode(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param = 0x06;

	ps2_command(ps2dev, &param, PSMOUSE_CMD_SETRES);
}

static void lifebook_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
	static const unsigned char params[] = { 0, 1, 2, 2, 3 };
	unsigned char p;

	if (resolution == 0 || resolution > 400)
		resolution = 400;

	p = params[resolution / 100];
	ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
	psmouse->resolution = 50 << p;
}

static void lifebook_disconnect(struct psmouse *psmouse)
{
	struct lifebook_data *priv = psmouse->private;

	psmouse_reset(psmouse);
	if (priv) {
		input_unregister_device(priv->dev2);
		kfree(priv);
	}
	psmouse->private = NULL;
}

int lifebook_detect(struct psmouse *psmouse, bool set_properties)
{
	if (!lifebook_present)
		return -1;

	if (desired_serio_phys &&
	    strcmp(psmouse->ps2dev.serio->phys, desired_serio_phys))
		return -1;

	if (set_properties) {
		psmouse->vendor = "Fujitsu";
		psmouse->name = "Lifebook TouchScreen";
	}

	return 0;
}

static int lifebook_create_relative_device(struct psmouse *psmouse)
{
	struct input_dev *dev2;
	struct lifebook_data *priv;
	int error = -ENOMEM;

	priv = kzalloc(sizeof(struct lifebook_data), GFP_KERNEL);
	dev2 = input_allocate_device();
	if (!priv || !dev2)
		goto err_out;

	priv->dev2 = dev2;
	snprintf(priv->phys, sizeof(priv->phys),
		 "%s/input1", psmouse->ps2dev.serio->phys);

	dev2->phys = priv->phys;
	dev2->name = "PS/2 Touchpad";
	dev2->id.bustype = BUS_I8042;
	dev2->id.vendor  = 0x0002;
	dev2->id.product = PSMOUSE_LIFEBOOK;
	dev2->id.version = 0x0000;
	dev2->dev.parent = &psmouse->ps2dev.serio->dev;

	dev2->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	dev2->relbit[BIT_WORD(REL_X)] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
	dev2->keybit[BIT_WORD(BTN_LEFT)] =
				BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);

	error = input_register_device(priv->dev2);
	if (error)
		goto err_out;

	psmouse->private = priv;
	return 0;

 err_out:
	input_free_device(dev2);
	kfree(priv);
	return error;
}

int lifebook_init(struct psmouse *psmouse)
{
	struct input_dev *dev1 = psmouse->dev;
	int max_coord = lifebook_use_6byte_proto ? 4096 : 1024;

	if (lifebook_absolute_mode(psmouse))
		return -1;

	dev1->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
	dev1->relbit[0] = 0;
	dev1->keybit[BIT_WORD(BTN_MOUSE)] = 0;
	dev1->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	input_set_abs_params(dev1, ABS_X, 0, max_coord, 0, 0);
	input_set_abs_params(dev1, ABS_Y, 0, max_coord, 0, 0);

	if (!desired_serio_phys) {
		if (lifebook_create_relative_device(psmouse)) {
			lifebook_relative_mode(psmouse);
			return -1;
		}
	}

	psmouse->protocol_handler = lifebook_process_byte;
	psmouse->set_resolution = lifebook_set_resolution;
	psmouse->disconnect = lifebook_disconnect;
	psmouse->reconnect  = lifebook_absolute_mode;

	psmouse->model = lifebook_use_6byte_proto ? 6 : 3;

	/*
	 * Use packet size = 3 even when using 6-byte protocol because
	 * that's what POLL will return on Lifebooks (according to spec).
	 */
	psmouse->pktsize = 3;

	return 0;
}