/*
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 Maciej W. Rozycki <macro@ds2.pg.gda.pl>
 */

#include <linux/config.h>

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kbd_ll.h>
#include <linux/kbd_kern.h>
#include <linux/vt_kern.h>

#include <asm/keyboard.h>
#include <asm/wbflush.h>
#include <asm/dec/tc.h>
#include <asm/dec/machtype.h>

#include "zs.h"
#include "lk201.h"

/* Simple translation table for the SysRq keys */

#ifdef CONFIG_MAGIC_SYSRQ
/*
 * Actually no translation at all, at least until we figure out
 * how to define SysRq for LK201 and friends. --macro
 */
unsigned char lk201_sysrq_xlate[128];
unsigned char *kbd_sysrq_xlate = lk201_sysrq_xlate;

unsigned char kbd_sysrq_key = -1;
#endif

#define KEYB_LINE	3

static int __init lk201_init(struct dec_serial *);
static void __init lk201_info(struct dec_serial *);
static void lk201_kbd_rx_char(unsigned char, unsigned char);

struct zs_hook lk201_kbdhook = {
	init_channel:   lk201_init,
	init_info:      lk201_info,
	rx_char:        NULL,
	poll_rx_char:   NULL,
	poll_tx_char:   NULL,
	cflags:         B4800 | CS8 | CSTOPB | CLOCAL
};

/*
 * This is used during keyboard initialisation
 */
static unsigned char lk201_reset_string[] = {
	LK_CMD_LEDS_ON, LK_PARAM_LED_MASK(0xf),	/* show we are resetting */
	LK_CMD_SET_DEFAULTS,
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 1),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 2),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 3),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 4),
	LK_CMD_MODE(LK_MODE_DOWN_UP, 5),
	LK_CMD_MODE(LK_MODE_DOWN_UP, 6),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 7),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 8),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 9),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 10),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 11),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 12),
	LK_CMD_MODE(LK_MODE_DOWN, 13),
	LK_CMD_MODE(LK_MODE_RPT_DOWN, 14),
	LK_CMD_ENB_RPT,
	LK_CMD_DIS_KEYCLK,
	LK_CMD_RESUME,
	LK_CMD_ENB_BELL, LK_PARAM_VOLUME(4),
	LK_CMD_LEDS_OFF, LK_PARAM_LED_MASK(0xf)
};

static struct dec_serial* lk201kbd_info;

static int __init lk201_reset(struct dec_serial *info)
{
	int i;

	for (i = 0; i < sizeof(lk201_reset_string); i++)
		if (info->hook->poll_tx_char(info, lk201_reset_string[i])) {
			printk(__FUNCTION__" transmit timeout\n");
			return -EIO;
		}
	return 0;
}

#define DEFAULT_KEYB_REP_DELAY	(250/5)	/* [5ms] */
#define DEFAULT_KEYB_REP_RATE	30	/* [cps] */

static struct kbd_repeat kbdrate = {
	DEFAULT_KEYB_REP_DELAY,
	DEFAULT_KEYB_REP_RATE
};

static void parse_kbd_rate(struct kbd_repeat *r)
{
	if (r->delay <= 0)
		r->delay = kbdrate.delay;
	if (r->rate <= 0)
		r->rate = kbdrate.rate;

	if (r->delay < 5)
		r->delay = 5;
	if (r->delay > 630)
		r->delay = 630;
	if (r->rate < 12)
		r->rate = 12;
	if (r->rate > 127)
		r->rate = 127;
	if (r->rate == 125)
		r->rate = 124;
}

static int write_kbd_rate(struct kbd_repeat *rep)
{
	struct dec_serial* info = lk201kbd_info;
	int delay, rate;
	int i;

	delay = rep->delay / 5;
	rate = rep->rate;
	for (i = 0; i < 4; i++) {
		if (info->hook->poll_tx_char(info, LK_CMD_RPT_RATE(i)))
			return 1;
		if (info->hook->poll_tx_char(info, LK_PARAM_DELAY(delay)))
			return 1;
		if (info->hook->poll_tx_char(info, LK_PARAM_RATE(rate)))
			return 1;
	}
	return 0;
}

static int lk201kbd_rate(struct kbd_repeat *rep)
{
	if (rep == NULL)
		return -EINVAL;

	parse_kbd_rate(rep);

	if (write_kbd_rate(rep)) {
		memcpy(rep, &kbdrate, sizeof(struct kbd_repeat));
		return -EIO;
	}

	memcpy(&kbdrate, rep, sizeof(struct kbd_repeat));

	return 0;
}

static void lk201kd_mksound(unsigned int hz, unsigned int ticks)
{
	struct dec_serial* info = lk201kbd_info;

	if (!ticks)
		return;

	/*
	 * Can't set frequency and we "approximate"
	 * duration by volume. ;-)
	 */
	ticks /= HZ / 32;
	if (ticks > 7)
		ticks = 7;
	ticks = 7 - ticks;

	if (info->hook->poll_tx_char(info, LK_CMD_ENB_BELL))
		return;
	if (info->hook->poll_tx_char(info, LK_PARAM_VOLUME(ticks)))
		return;
	if (info->hook->poll_tx_char(info, LK_CMD_BELL))
		return;
}

void kbd_leds(unsigned char leds)
{
	struct dec_serial* info = lk201kbd_info;
	unsigned char l = 0;

	if (!info)		/* FIXME */
		return;

	/* FIXME -- Only Hold and Lock LEDs for now. --macro */
	if (leds & LED_SCR)
		l |= LK_LED_HOLD;
	if (leds & LED_CAP)
		l |= LK_LED_LOCK;

	if (info->hook->poll_tx_char(info, LK_CMD_LEDS_ON))
		return;
	if (info->hook->poll_tx_char(info, LK_PARAM_LED_MASK(l)))
		return;
	if (info->hook->poll_tx_char(info, LK_CMD_LEDS_OFF))
		return;
	if (info->hook->poll_tx_char(info, LK_PARAM_LED_MASK(~l)))
		return;
}

int kbd_setkeycode(unsigned int scancode, unsigned int keycode)
{
	return -EINVAL;
}

int kbd_getkeycode(unsigned int scancode)
{
	return -EINVAL;
}

int kbd_translate(unsigned char scancode, unsigned char *keycode,
		  char raw_mode)
{
	*keycode = scancode;
	return 1;
}

char kbd_unexpected_up(unsigned char keycode)
{
	return 0x80;
}

static void lk201_kbd_rx_char(unsigned char ch, unsigned char stat)
{
	static int shift_state = 0;
	static int prev_scancode;
	unsigned char c = scancodeRemap[ch];

	if (!stat || stat == 4) {
		switch (ch) {
		case LK_STAT_RESUME_ERR:
		case LK_STAT_ERROR:
		case LK_STAT_INHIBIT_ACK:
		case LK_STAT_TEST_ACK:
		case LK_STAT_MODE_KEYDOWN:
		case LK_STAT_MODE_ACK:
			break;
		case LK_KEY_LOCK:
			shift_state ^= LK_LOCK;
			handle_scancode(c, shift_state && LK_LOCK ? 1 : 0);
			break;
		case LK_KEY_SHIFT:
			shift_state ^= LK_SHIFT;
			handle_scancode(c, shift_state && LK_SHIFT ? 1 : 0);
			break;
		case LK_KEY_CTRL:
			shift_state ^= LK_CTRL;
			handle_scancode(c, shift_state && LK_CTRL ? 1 : 0);
			break;
		case LK_KEY_COMP:
			shift_state ^= LK_COMP;
			handle_scancode(c, shift_state && LK_COMP ? 1 : 0);
			break;
		case LK_KEY_RELEASE:
			if (shift_state & LK_SHIFT)
				handle_scancode(scancodeRemap[LK_KEY_SHIFT], 0);
			if (shift_state & LK_CTRL)
				handle_scancode(scancodeRemap[LK_KEY_CTRL], 0);
			if (shift_state & LK_COMP)
				handle_scancode(scancodeRemap[LK_KEY_COMP], 0);
			if (shift_state & LK_LOCK)
				handle_scancode(scancodeRemap[LK_KEY_LOCK], 0);
			shift_state = 0;
			break;
		case LK_KEY_REPEAT:
			handle_scancode(prev_scancode, 1);
			break;
		default:
			prev_scancode = c;
			handle_scancode(c, 1);
			break;
		}
	} else
		printk("Error reading LKx01 keyboard: 0x%02x\n", stat);
	tasklet_schedule(&keyboard_tasklet);
}

static void __init lk201_info(struct dec_serial *info)
{
}

static int __init lk201_init(struct dec_serial *info)
{
	unsigned int ch, id = 0;
	int result;

	printk("DECstation LK keyboard driver v0.04... ");

	result = lk201_reset(info);
	if (result)
		return result;
	mdelay(10);

	/*
	 * Detect whether there is an LK201 or an LK401
	 * The LK401 has ALT keys...
	 */
	info->hook->poll_tx_char(info, LK_CMD_REQ_ID);
	while ((ch = info->hook->poll_rx_char(info)) > 0)
		id = ch;

	switch (id) {
	case 1:
		printk("LK201 detected\n");
		break;
	case 2:
		printk("LK401 detected\n");
		break;
	default:
		printk("unknown keyboard, ID %d,\n", id);
		printk("... please report to <linux-mips@oss.sgi.com>\n");
	}

	/*
	 * now we're ready
	 */
	info->hook->rx_char = lk201_kbd_rx_char;

	lk201kbd_info = info;
	kbd_rate = lk201kbd_rate;
	kd_mksound = lk201kd_mksound;

	return 0;
}

void __init kbd_init_hw(void)
{
	extern int register_zs_hook(unsigned int, struct zs_hook *);
	extern int unregister_zs_hook(unsigned int);

	if (TURBOCHANNEL) {
		if (mips_machtype != MACH_DS5000_XX) {
			/*
			 * This is not a MAXINE, so:
			 *
			 * kbd_init_hw() is being called before
			 * rs_init() so just register the kbd hook
			 * and let zs_init do the rest :-)
			 */
			if (mips_machtype == MACH_DS5000_200)
				printk("LK201 Support for DS5000/200 not yet ready ...\n");
			else
				if(!register_zs_hook(KEYB_LINE, &lk201_kbdhook))
					unregister_zs_hook(KEYB_LINE);
		}
	} else {
		/*
		 * TODO: modify dz.c to allow similar hooks
		 * for LK201 handling on DS2100, DS3100, and DS5000/200
		 */
		printk("LK201 Support for DS3100 not yet ready ...\n");
	}
}