/*
 *
 * Copyright (C) 2008-2010 coresystems GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

// #define USB_DEBUG

#include <keycodes.h>
#include <usb/usb.h>

enum { hid_subclass_none = 0, hid_subclass_boot = 1 };
typedef enum { hid_proto_boot = 0, hid_proto_report = 1 } hid_proto;
enum { hid_boot_proto_none = 0, hid_boot_proto_keyboard =
		1, hid_boot_proto_mouse = 2
};
static const char *boot_protos[3] = { "(none)", "keyboard", "mouse" };
enum { GET_REPORT = 0x1, GET_IDLE = 0x2, GET_PROTOCOL = 0x3, SET_REPORT =
		0x9, SET_IDLE = 0xa, SET_PROTOCOL = 0xb
};

typedef union {
	struct {
		u8 modifiers;
		u8 repeats;
		u8 keys[6];
	};
	u8 buffer[8];
} usb_hid_keyboard_event_t;

typedef struct {
	void* queue;
	hid_descriptor_t *descriptor;

	usb_hid_keyboard_event_t previous;
	int lastkeypress;
	int repeat_delay;
} usbhid_inst_t;

#define HID_INST(dev) ((usbhid_inst_t*)(dev)->data)

static void
usb_hid_destroy(usbdev_t *dev)
{
	if (HID_INST(dev)->queue) {
		int i;
		for (i = 0; i <= dev->num_endp; i++) {
			if (dev->endpoints[i].endpoint == 0)
				continue;
			if (dev->endpoints[i].type != INTERRUPT)
				continue;
			if (dev->endpoints[i].direction != IN)
				continue;
			break;
		}
		dev->controller->destroy_intr_queue(
				&dev->endpoints[i], HID_INST(dev)->queue);
		HID_INST(dev)->queue = NULL;
	}
	free(HID_INST(dev)->descriptor);
	HID_INST(dev)->descriptor = NULL;

	free(dev->data);
}

/* keybuffer is global to all USB keyboards */
static int keycount;
#define KEYBOARD_BUFFER_SIZE 16
static short keybuffer[KEYBOARD_BUFFER_SIZE];
static int modifiers;

const char *countries[36][2] = {
	{ "not supported", "us" },
	{ "Arabic", "ae" },
	{ "Belgian", "be" },
	{ "Canadian-Bilingual", "ca" },
	{ "Canadian-French", "ca" },
	{ "Czech Republic", "cz" },
	{ "Danish", "dk" },
	{ "Finnish", "fi" },
	{ "French", "fr" },
	{ "German", "de" },
	{ "Greek", "gr" },
	{ "Hebrew", "il" },
	{ "Hungary", "hu" },
	{ "International (ISO)", "iso" },
	{ "Italian", "it" },
	{ "Japan (Katakana)", "jp" },
	{ "Korean", "us" },
	{ "Latin American", "us" },
	{ "Netherlands/Dutch", "nl" },
	{ "Norwegian", "no" },
	{ "Persian (Farsi)", "ir" },
	{ "Poland", "pl" },
	{ "Portuguese", "pt" },
	{ "Russia", "ru" },
	{ "Slovakia", "sl" },
	{ "Spanish", "es" },
	{ "Swedish", "se" },
	{ "Swiss/French", "ch" },
	{ "Swiss/German", "ch" },
	{ "Switzerland", "ch" },
	{ "Taiwan", "tw" },
	{ "Turkish-Q", "tr" },
	{ "UK", "uk" },
	{ "US", "us" },
	{ "Yugoslavia", "yu" },
	{ "Turkish-F", "tr" },
	/* 36 - 255: Reserved */
};

struct layout_maps {
	const char *country;
	const short map[4][0x80];
};

static const struct layout_maps *map;

static const struct layout_maps keyboard_layouts[] = {
// #if CONFIG(LP_PC_KEYBOARD_LAYOUT_US)
{ .country = "us", .map = {
	{ /* No modifier */
	-1, -1, -1, -1, 'a', 'b', 'c', 'd',
	'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
	/* 0x10 */
	'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
	'u', 'v', 'w', 'x', 'y', 'z', '1', '2',
	/* 0x20 */
	'3', '4', '5', '6', '7', '8', '9', '0',
	'\n', '\e', '\b', '\t', ' ', '-', '=', '[',
	/* 0x30 */
	']', '\\', -1, ';', '\'', '`', ',', '.',
	'/', -1 /* CapsLk */, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5), KEY_F(6),
	/* 0x40 */
	KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), KEY_F(11), KEY_F(12), KEY_PRINT, -1 /* ScrLk */,
	KEY_BREAK, KEY_IC, KEY_HOME, KEY_PPAGE, KEY_DC, KEY_END, KEY_NPAGE, KEY_RIGHT,
	/* 50 */
	KEY_LEFT, KEY_DOWN, KEY_UP, -1 /*NumLck*/, '/', '*', '-' /* = ? */, '+',
	KEY_ENTER, KEY_END, KEY_DOWN, KEY_NPAGE, KEY_LEFT, -1, KEY_RIGHT, KEY_HOME,
	/* 60 */
	KEY_UP, KEY_PPAGE, -1, KEY_DC, -1 /* < > | */, -1 /* Win Key Right */, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	/* 70 */
	-1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	 },
	{ /* Shift modifier */
	-1, -1, -1, -1, 'A', 'B', 'C', 'D',
	'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
	/* 0x10 */
	'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
	'U', 'V', 'W', 'X', 'Y', 'Z', '!', '@',
	/* 0x20 */
	'#', '$', '%', '^', '&', '*', '(', ')',
	'\n', '\e', '\b', '\t', ' ', '_', '+', '[',
	/* 0x30 */
	']', '\\', -1, ':', '\'', '`', ',', '.',
	'/', -1 /* CapsLk */, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5), KEY_F(6),
	/* 0x40 */
	KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), KEY_F(11), KEY_F(12), KEY_PRINT, -1 /* ScrLk */,
	KEY_BREAK, KEY_IC, KEY_HOME, KEY_PPAGE, KEY_DC, KEY_END, KEY_NPAGE, KEY_RIGHT,
	/* 50 */
	KEY_LEFT, KEY_DOWN, KEY_UP, -1 /*NumLck*/, '/', '*', '-' /* = ? */, '+',
	KEY_ENTER, KEY_END, KEY_DOWN, KEY_NPAGE, KEY_LEFT, -1, KEY_RIGHT, KEY_HOME,
	/* 60 */
	KEY_UP, KEY_PPAGE, -1, KEY_DC, -1 /* < > | */, -1 /* Win Key Right */, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	/* 70 */
	-1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	 },
	{ /* Alt */
	-1, -1, -1, -1, 'a', 'b', 'c', 'd',
	'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
	/* 0x10 */
	'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
	'u', 'v', 'w', 'x', 'y', 'z', '1', '2',
	/* 0x20 */
	'3', '4', '5', '6', '7', '8', '9', '0',
	'\n', '\e', '\b', '\t', ' ', '-', '=', '[',
	/* 0x30 */
	']', '\\', -1, ';', '\'', '`', ',', '.',
	'/', -1 /* CapsLk */, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5), KEY_F(6),
	/* 0x40 */
	KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), KEY_F(11), KEY_F(12), KEY_PRINT, -1 /* ScrLk */,
	KEY_BREAK, KEY_IC, KEY_HOME, KEY_PPAGE, KEY_DC, KEY_END, KEY_NPAGE, KEY_RIGHT,
	/* 50 */
	KEY_LEFT, KEY_DOWN, KEY_UP, -1 /*NumLck*/, '/', '*', '-' /* = ? */, '+',
	KEY_ENTER, KEY_END, KEY_DOWN, KEY_NPAGE, KEY_LEFT, -1, KEY_RIGHT, KEY_HOME,
	/* 60 */
	KEY_UP, KEY_PPAGE, -1, KEY_DC, -1 /* < > | */, -1 /* Win Key Right */, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	/* 70 */
	-1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	 },
	{ /* Shift+Alt modifier */
	-1, -1, -1, -1, 'A', 'B', 'C', 'D',
	'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
	/* 0x10 */
	'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
	'U', 'V', 'W', 'X', 'Y', 'Z', '!', '@',
	/* 0x20 */
	'#', '$', '%', '^', '&', '*', '(', ')',
	'\n', '\e', '\b', '\t', ' ', '-', '=', '[',
	/* 0x30 */
	']', '\\', -1, ':', '\'', '`', ',', '.',
	'/', -1 /* CapsLk */, KEY_F(1), KEY_F(2), KEY_F(3), KEY_F(4), KEY_F(5), KEY_F(6),
	/* 0x40 */
	KEY_F(7), KEY_F(8), KEY_F(9), KEY_F(10), KEY_F(11), KEY_F(12), KEY_PRINT, -1 /* ScrLk */,
	KEY_BREAK, KEY_IC, KEY_HOME, KEY_PPAGE, KEY_DC, KEY_END, KEY_NPAGE, KEY_RIGHT,
	/* 50 */
	KEY_LEFT, KEY_DOWN, KEY_UP, -1 /*NumLck*/, '/', '*', '-' /* = ? */, '+',
	KEY_ENTER, KEY_END, KEY_DOWN, KEY_NPAGE, KEY_LEFT, -1, KEY_RIGHT, KEY_HOME,
	/* 60 */
	KEY_UP, KEY_PPAGE, -1, KEY_DC, -1 /* < > | */, -1 /* Win Key Right */, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	/* 70 */
	-1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1, -1,
	 }
}},
//#endif
};

static void usb_hid_keyboard_queue(int ch) {
	/* ignore key presses if buffer full */
	if (keycount < KEYBOARD_BUFFER_SIZE)
		keybuffer[keycount++] = ch;
}

#define KEYBOARD_REPEAT_MS	30
#define INITIAL_REPEAT_DELAY	10
#define REPEAT_DELAY		 2

static void
usb_hid_process_keyboard_event(usbhid_inst_t *const inst,
		const usb_hid_keyboard_event_t *const current)
{
	const usb_hid_keyboard_event_t *const previous = &inst->previous;

	int i, keypress = 0;

	modifiers = 0;

	if (current->modifiers & 0x01) /* Left-Ctrl */
		modifiers |= KB_MOD_CTRL;
	if (current->modifiers & 0x02) /* Left-Shift */
		modifiers |= KB_MOD_SHIFT;
	if (current->modifiers & 0x04) /* Left-Alt */
		modifiers |= KB_MOD_ALT;
	if (current->modifiers & 0x08) /* Left-GUI */
		;
	if (current->modifiers & 0x10) /* Right-Ctrl */
		modifiers |= KB_MOD_CTRL;
	if (current->modifiers & 0x20) /* Right-Shift */
		modifiers |= KB_MOD_SHIFT;
	if (current->modifiers & 0x40) /* Right-AltGr */
		modifiers |= KB_MOD_ALT;
	if (current->modifiers & 0x80) /* Right-GUI */
		;

	if ((current->modifiers & 0x05) && ((current->keys[0] == 0x4c) ||
				(current->keys[0] == 0x63))) {
		/* vulcan nerve pinch */
		if (reset_handler)
			reset_handler();
	}

	/* Did the event change at all? */
	if (inst->lastkeypress &&
			!memcmp(current, previous, sizeof(*current))) {
		/* No. Then it's a key repeat event. */
		if (inst->repeat_delay) {
			inst->repeat_delay--;
		} else {
			usb_hid_keyboard_queue(inst->lastkeypress);
			inst->repeat_delay = REPEAT_DELAY;
		}

		return;
	}

	inst->lastkeypress = 0;

	for (i = 0; i < 6; i++) {
		int j;
		int skip = 0;
		// No more keys? skip
		if (current->keys[i] == 0)
			return;

		for (j = 0; j < 6; j++) {
			if (current->keys[i] == previous->keys[j]) {
				skip = 1;
				break;
			}
		}
		if (skip)
			continue;

		/* Mask off KB_MOD_CTRL */
		keypress = map->map[modifiers & 0x03][current->keys[i]];

		if (modifiers & KB_MOD_CTRL) {
			switch (keypress) {
			case 'a' ... 'z':
				keypress &= 0x1f;
				break;
			default:
				continue;
			}
		}

		if (keypress == -1) {
			/* Debug: Print unknown keys */
			usb_debug("usbhid: <%x> %x [ %x %x %x %x %x %x ] %d\n",
				current->modifiers, current->repeats,
			current->keys[0], current->keys[1],
			current->keys[2], current->keys[3],
			current->keys[4], current->keys[5], i);

			/* Unknown key? Try next one in the queue */
			continue;
		}

		usb_hid_keyboard_queue(keypress);

		/* Remember for authentic key repeat */
		inst->lastkeypress = keypress;
		inst->repeat_delay = INITIAL_REPEAT_DELAY;
	}
}

static void
usb_hid_poll(usbdev_t *dev)
{
	usb_hid_keyboard_event_t current;
	const u8 *buf;

	while ((buf = dev->controller->poll_intr_queue (HID_INST(dev)->queue))) {
		memcpy(&current.buffer, buf, 8);
		usb_hid_process_keyboard_event(HID_INST(dev), &current);
		HID_INST(dev)->previous = current;
	}
}

static void
usb_hid_set_idle(usbdev_t *dev, interface_descriptor_t *interface, u16 duration)
{
	dev_req_t dr;
	dr.data_dir = host_to_device;
	dr.req_type = class_type;
	dr.req_recp = iface_recp;
	dr.bRequest = SET_IDLE;
	dr.wValue = (duration >> 2) << 8;
	dr.wIndex = interface->bInterfaceNumber;
	dr.wLength = 0;
	dev->controller->control(dev, OUT, sizeof(dev_req_t), &dr, 0, 0);
}

static void
usb_hid_set_protocol(usbdev_t *dev, interface_descriptor_t *interface, hid_proto proto)
{
	dev_req_t dr;
	dr.data_dir = host_to_device;
	dr.req_type = class_type;
	dr.req_recp = iface_recp;
	dr.bRequest = SET_PROTOCOL;
	dr.wValue = proto;
	dr.wIndex = interface->bInterfaceNumber;
	dr.wLength = 0;
	dev->controller->control(dev, OUT, sizeof(dev_req_t), &dr, 0, 0);
}

static struct console_input_driver cons = {
	.havekey = usbhid_havechar,
	.getchar = usbhid_getchar,
	.input_type = CONSOLE_INPUT_TYPE_USB,
};

static int usb_hid_set_layout(const char *country)
{
	/* FIXME should be per keyboard */
	int i;

	for (i = 0; i < ARRAY_SIZE(keyboard_layouts); i++) {
		if (strncmp(keyboard_layouts[i].country, country,
					strlen(keyboard_layouts[i].country)))
			continue;

		/* Found, changing keyboard layout */
		map = &keyboard_layouts[i];
		usb_debug("  Keyboard layout '%s'\n", map->country);
		return 0;
	}

	usb_debug("  Keyboard layout '%s' not found, using '%s'\n",
			country, map->country);

	/* Nothing found, not changed */
	return -1;
}

void
usb_hid_init(usbdev_t *dev)
{

	static int installed = 0;
	if (!installed) {
		installed = 1;
		console_add_input_driver(&cons);
	}

	configuration_descriptor_t *cd = (configuration_descriptor_t*)dev->configuration;
	interface_descriptor_t *interface = (interface_descriptor_t*)(((char *) cd) + cd->bLength);

	if (interface->bInterfaceSubClass == hid_subclass_boot) {
		u8 countrycode;
		usb_debug("  supports boot interface..\n");
		usb_debug("  it's a %s\n",
			boot_protos[interface->bInterfaceProtocol]);
		switch (interface->bInterfaceProtocol) {
		case hid_boot_proto_keyboard:
			dev->data = xzalloc(sizeof(usbhid_inst_t));
			usb_debug("  configuring...\n");
			usb_hid_set_protocol(dev, interface, hid_proto_boot);
			usb_hid_set_idle(dev, interface, KEYBOARD_REPEAT_MS);
			usb_debug("  activating...\n");

			hid_descriptor_t *desc = malloc(sizeof(hid_descriptor_t));
			if (!desc || get_descriptor(dev, gen_bmRequestType(
				device_to_host, standard_type, iface_recp),
				0x21, 0, desc, sizeof(*desc)) != sizeof(*desc)) {
				usb_debug("get_descriptor(HID) failed\n");
				usb_detach_device(dev->controller, dev->address);
				return;
			}
			HID_INST(dev)->descriptor = desc;
			countrycode = desc->bCountryCode;
			/* 35 countries defined: */
			if (countrycode >= ARRAY_SIZE(countries))
				countrycode = 0;
			usb_debug("  Keyboard has %s layout (country code %02x)\n",
					countries[countrycode][0], countrycode);

			/* Set keyboard layout accordingly */
			usb_hid_set_layout(countries[countrycode][1]);

			// only add here, because we only support boot-keyboard HID devices
			dev->destroy = usb_hid_destroy;
			dev->poll = usb_hid_poll;
			int i;
			for (i = 1; i < dev->num_endp; i++) {
				if (dev->endpoints[i].type != INTERRUPT)
					continue;
				if (dev->endpoints[i].direction != IN)
					continue;
				break;
			}
			if (i >= dev->num_endp) {
				usb_debug("Could not find HID endpoint\n");
				usb_detach_device(dev->controller, dev->address);
				return;
			}
			usb_debug("  found endpoint %x for interrupt-in\n", i);
			/* 20 buffers of 8 bytes, for every 10 msecs */
			HID_INST(dev)->queue = dev->controller->create_intr_queue(&dev->endpoints[i], 8, 20, 10);
			keycount = 0;
			usb_debug("  configuration done.\n");
			break;
		case hid_boot_proto_mouse:
			usb_debug("NOTICE: USB mice are not supported.\n");
			break;
		}
	}
}

int usbhid_havechar (void)
{
	return (keycount != 0);
}

int usbhid_getchar (void)
{
	short ret;

	if (keycount == 0)
		return 0;
	ret = keybuffer[0];
	memmove(keybuffer, keybuffer + 1, --keycount);

	return (int)ret;
}

int usbhid_getmodifiers(void)
{
	return modifiers;
}