/*
 * Logitech PS/2++ mouse driver
 *
 * Copyright (c) 1999-2003 Vojtech Pavlik <vojtech@suse.cz>
 * Copyright (c) 2003 Eric Wong <eric@yhbt.net>
 *
 * 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 "psmouse.h"
#include "logips2pp.h"

/* Logitech mouse types */
#define PS2PP_KIND_WHEEL	1
#define PS2PP_KIND_MX		2
#define PS2PP_KIND_TP3		3

/* Logitech mouse features */
#define PS2PP_WHEEL		0x01
#define PS2PP_HWHEEL		0x02
#define PS2PP_SIDE_BTN		0x04
#define PS2PP_EXTRA_BTN		0x08
#define PS2PP_TASK_BTN		0x10
#define PS2PP_NAV_BTN		0x20

struct ps2pp_info {
	const int model;
	unsigned const int kind;
	unsigned const int features;
};

/*
 * Process a PS2++ or PS2T++ packet.
 */

static psmouse_ret_t ps2pp_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
{
	struct input_dev *dev = psmouse->dev;
	unsigned char *packet = psmouse->packet;

	if (psmouse->pktcnt < 3)
		return PSMOUSE_GOOD_DATA;

/*
 * Full packet accumulated, process it
 */

	input_regs(dev, regs);

	if ((packet[0] & 0x48) == 0x48 && (packet[1] & 0x02) == 0x02) {

		/* Logitech extended packet */
		switch ((packet[1] >> 4) | (packet[0] & 0x30)) {

			case 0x0d: /* Mouse extra info */

				input_report_rel(dev, packet[2] & 0x80 ? REL_HWHEEL : REL_WHEEL,
					(int) (packet[2] & 8) - (int) (packet[2] & 7));
				input_report_key(dev, BTN_SIDE, (packet[2] >> 4) & 1);
				input_report_key(dev, BTN_EXTRA, (packet[2] >> 5) & 1);

				break;

			case 0x0e: /* buttons 4, 5, 6, 7, 8, 9, 10 info */

				input_report_key(dev, BTN_SIDE, (packet[2]) & 1);
				input_report_key(dev, BTN_EXTRA, (packet[2] >> 1) & 1);
				input_report_key(dev, BTN_BACK, (packet[2] >> 3) & 1);
				input_report_key(dev, BTN_FORWARD, (packet[2] >> 4) & 1);
				input_report_key(dev, BTN_TASK, (packet[2] >> 2) & 1);

				break;

			case 0x0f: /* TouchPad extra info */

				input_report_rel(dev, packet[2] & 0x08 ? REL_HWHEEL : REL_WHEEL,
					(int) ((packet[2] >> 4) & 8) - (int) ((packet[2] >> 4) & 7));
				packet[0] = packet[2] | 0x08;
				break;

#ifdef DEBUG
			default:
				printk(KERN_WARNING "psmouse.c: Received PS2++ packet #%x, but don't know how to handle.\n",
					(packet[1] >> 4) | (packet[0] & 0x30));
#endif
		}
	} else {
		/* Standard PS/2 motion data */
		input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
		input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);
	}

	input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
	input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
	input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);

	input_sync(dev);

	return PSMOUSE_FULL_PACKET;

}

/*
 * ps2pp_cmd() sends a PS2++ command, sliced into two bit
 * pieces through the SETRES command. This is needed to send extended
 * commands to mice on notebooks that try to understand the PS/2 protocol
 * Ugly.
 */

static int ps2pp_cmd(struct psmouse *psmouse, unsigned char *param, unsigned char command)
{
	if (psmouse_sliced_command(psmouse, command))
		return -1;

	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_POLL))
		return -1;

	return 0;
}

/*
 * SmartScroll / CruiseControl for some newer Logitech mice Defaults to
 * enabled if we do nothing to it. Of course I put this in because I want it
 * disabled :P
 * 1 - enabled (if previously disabled, also default)
 * 0 - disabled
 */

static void ps2pp_set_smartscroll(struct psmouse *psmouse, unsigned int smartscroll)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[4];

	if (smartscroll > 1)
		smartscroll = 1;

	ps2pp_cmd(psmouse, param, 0x32);

	param[0] = 0;
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);

	param[0] = smartscroll;
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
}

static ssize_t ps2pp_attr_show_smartscroll(struct psmouse *psmouse, void *data, char *buf)
{
	return sprintf(buf, "%d\n", psmouse->smartscroll ? 1 : 0);
}

static ssize_t ps2pp_attr_set_smartscroll(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
	unsigned long value;
	char *rest;

	value = simple_strtoul(buf, &rest, 10);
	if (*rest || value > 1)
		return -EINVAL;

	ps2pp_set_smartscroll(psmouse, value);
	psmouse->smartscroll = value;
	return count;
}

PSMOUSE_DEFINE_ATTR(smartscroll, S_IWUSR | S_IRUGO, NULL,
			ps2pp_attr_show_smartscroll, ps2pp_attr_set_smartscroll);

/*
 * Support 800 dpi resolution _only_ if the user wants it (there are good
 * reasons to not use it even if the mouse supports it, and of course there are
 * also good reasons to use it, let the user decide).
 */

static void ps2pp_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
	if (resolution > 400) {
		struct ps2dev *ps2dev = &psmouse->ps2dev;
		unsigned char param = 3;

		ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
		ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
		ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
		ps2_command(ps2dev, &param, PSMOUSE_CMD_SETRES);
		psmouse->resolution = 800;
	} else
		psmouse_set_resolution(psmouse, resolution);
}

static void ps2pp_disconnect(struct psmouse *psmouse)
{
	device_remove_file(&psmouse->ps2dev.serio->dev, &psmouse_attr_smartscroll.dattr);
}

static struct ps2pp_info *get_model_info(unsigned char model)
{
	static struct ps2pp_info ps2pp_list[] = {
		{ 12,	0,			PS2PP_SIDE_BTN},
		{ 13,	0,			0 },
		{ 15,	PS2PP_KIND_MX,					/* MX1000 */
				PS2PP_WHEEL | PS2PP_SIDE_BTN | PS2PP_TASK_BTN |
				PS2PP_EXTRA_BTN | PS2PP_NAV_BTN | PS2PP_HWHEEL },
		{ 40,	0,			PS2PP_SIDE_BTN },
		{ 41,	0,			PS2PP_SIDE_BTN },
		{ 42,	0,			PS2PP_SIDE_BTN },
		{ 43,	0,			PS2PP_SIDE_BTN },
		{ 50,	0,			0 },
		{ 51,	0,			0 },
		{ 52,	PS2PP_KIND_WHEEL,	PS2PP_SIDE_BTN | PS2PP_WHEEL },
		{ 53,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 61,	PS2PP_KIND_MX,					/* MX700 */
				PS2PP_WHEEL | PS2PP_SIDE_BTN | PS2PP_TASK_BTN |
				PS2PP_EXTRA_BTN | PS2PP_NAV_BTN },
		{ 66,	PS2PP_KIND_MX,					/* MX3100 reciver */
				PS2PP_WHEEL | PS2PP_SIDE_BTN | PS2PP_TASK_BTN |
				PS2PP_EXTRA_BTN | PS2PP_NAV_BTN | PS2PP_HWHEEL },
		{ 73,	0,			PS2PP_SIDE_BTN },
		{ 75,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 76,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 80,	PS2PP_KIND_WHEEL,	PS2PP_SIDE_BTN | PS2PP_WHEEL },
		{ 81,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 83,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 86,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 88,	PS2PP_KIND_WHEEL,	PS2PP_WHEEL },
		{ 96,	0,			0 },
		{ 97,	PS2PP_KIND_TP3,		PS2PP_WHEEL | PS2PP_HWHEEL },
		{ 100,	PS2PP_KIND_MX,					/* MX510 */
				PS2PP_WHEEL | PS2PP_SIDE_BTN | PS2PP_TASK_BTN |
				PS2PP_EXTRA_BTN | PS2PP_NAV_BTN },
		{ 111,  PS2PP_KIND_MX,					/* MX300 */
				PS2PP_WHEEL | PS2PP_EXTRA_BTN | PS2PP_TASK_BTN },
		{ 112,	PS2PP_KIND_MX,					/* MX500 */
				PS2PP_WHEEL | PS2PP_SIDE_BTN | PS2PP_TASK_BTN |
				PS2PP_EXTRA_BTN | PS2PP_NAV_BTN },
		{ 114,	PS2PP_KIND_MX,					/* MX310 */
				PS2PP_WHEEL | PS2PP_SIDE_BTN |
				PS2PP_TASK_BTN | PS2PP_EXTRA_BTN },
		{ }
	};
	int i;

	for (i = 0; ps2pp_list[i].model; i++)
		if (model == ps2pp_list[i].model)
			return &ps2pp_list[i];

	printk(KERN_WARNING "logips2pp: Detected unknown logitech mouse model %d\n", model);
	return NULL;
}

/*
 * Set up input device's properties based on the detected mouse model.
 */

static void ps2pp_set_model_properties(struct psmouse *psmouse, struct ps2pp_info *model_info,
				       int using_ps2pp)
{
	struct input_dev *input_dev = psmouse->dev;

	if (model_info->features & PS2PP_SIDE_BTN)
		set_bit(BTN_SIDE, input_dev->keybit);

	if (model_info->features & PS2PP_EXTRA_BTN)
		set_bit(BTN_EXTRA, input_dev->keybit);

	if (model_info->features & PS2PP_TASK_BTN)
		set_bit(BTN_TASK, input_dev->keybit);

	if (model_info->features & PS2PP_NAV_BTN) {
		set_bit(BTN_FORWARD, input_dev->keybit);
		set_bit(BTN_BACK, input_dev->keybit);
	}

	if (model_info->features & PS2PP_WHEEL)
		set_bit(REL_WHEEL, input_dev->relbit);

	if (model_info->features & PS2PP_HWHEEL)
		set_bit(REL_HWHEEL, input_dev->relbit);

	switch (model_info->kind) {
		case PS2PP_KIND_WHEEL:
			psmouse->name = "Wheel Mouse";
			break;

		case PS2PP_KIND_MX:
			psmouse->name = "MX Mouse";
			break;

		case PS2PP_KIND_TP3:
			psmouse->name = "TouchPad 3";
			break;

		default:
			/*
			 * Set name to "Mouse" only when using PS2++,
			 * otherwise let other protocols define suitable
			 * name
			 */
			if (using_ps2pp)
				psmouse->name = "Mouse";
			break;
	}
}


/*
 * Logitech magic init. Detect whether the mouse is a Logitech one
 * and its exact model and try turning on extended protocol for ones
 * that support it.
 */

int ps2pp_init(struct psmouse *psmouse, int set_properties)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[4];
	unsigned char model, buttons;
	struct ps2pp_info *model_info;
	int use_ps2pp = 0;

	param[0] = 0;
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
	ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
	param[1] = 0;
	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);

	if (!param[1])
		return -1;

	model = ((param[0] >> 4) & 0x07) | ((param[0] << 3) & 0x78);
	buttons = param[1];

	if ((model_info = get_model_info(model)) != NULL) {

/*
 * Do Logitech PS2++ / PS2T++ magic init.
 */
		if (model == 97) { /* Touch Pad 3 */

			/* Unprotect RAM */
			param[0] = 0x11; param[1] = 0x04; param[2] = 0x68;
			ps2_command(ps2dev, param, 0x30d1);
			/* Enable features */
			param[0] = 0x11; param[1] = 0x05; param[2] = 0x0b;
			ps2_command(ps2dev, param, 0x30d1);
			/* Enable PS2++ */
			param[0] = 0x11; param[1] = 0x09; param[2] = 0xc3;
			ps2_command(ps2dev, param, 0x30d1);

			param[0] = 0;
			if (!ps2_command(ps2dev, param, 0x13d1) &&
			    param[0] == 0x06 && param[1] == 0x00 && param[2] == 0x14) {
				use_ps2pp = 1;
			}

		} else {

			param[0] = param[1] = param[2] = 0;
			ps2pp_cmd(psmouse, param, 0x39); /* Magic knock */
			ps2pp_cmd(psmouse, param, 0xDB);

			if ((param[0] & 0x78) == 0x48 &&
			    (param[1] & 0xf3) == 0xc2 &&
			    (param[2] & 0x03) == ((param[1] >> 2) & 3)) {
				ps2pp_set_smartscroll(psmouse, psmouse->smartscroll);
				use_ps2pp = 1;
			}
		}
	}

	if (set_properties) {
		psmouse->vendor = "Logitech";
		psmouse->model = model;

		if (use_ps2pp) {
			psmouse->protocol_handler = ps2pp_process_byte;
			psmouse->pktsize = 3;

			if (model_info->kind != PS2PP_KIND_TP3) {
				psmouse->set_resolution = ps2pp_set_resolution;
				psmouse->disconnect = ps2pp_disconnect;

				device_create_file(&psmouse->ps2dev.serio->dev,
						   &psmouse_attr_smartscroll.dattr);
			}
		}

		if (buttons < 3)
			clear_bit(BTN_MIDDLE, psmouse->dev->keybit);

		if (model_info)
			ps2pp_set_model_properties(psmouse, model_info, use_ps2pp);
	}

	return use_ps2pp ? 0 : -1;
}