/* $Id: drv_Cwlinux.c 929 2008-12-31 06:40:59Z michael $
 * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_Cwlinux.c $
 *
 * new style driver for Cwlinux display modules
 *
 * Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
 * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_Cwlinux
 *
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "debug.h"
#include "cfg.h"
#include "qprintf.h"
#include "timer.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "widget_keypad.h"
#include "drv.h"
#include "drv_generic_text.h"
#include "drv_generic_gpio.h"
#include "drv_generic_serial.h"
#include "drv_generic_keypad.h"


static char Name[] = "Cwlinux";

static int Model;
static int Protocol;

/* ring buffer for bytes received from the display */
static unsigned char RingBuffer[256];
static unsigned int RingRPos = 0;
static unsigned int RingWPos = 0;

typedef struct {
    int type;
    char *name;
    int rows;
    int cols;
    int xres;			/* pixel width of one char */
    int yres;			/* pixel height of one char */
    int gpos;
    int gpis;
    int chars;			/* number of user definable chars */
    int protocol;
} MODEL;


/* Fixme: number of gpo's should be verified */

static MODEL Models[] = {
    /* type, name, rows, cols, xres/char, yres/char, gpo's, gpi's, definable chars, protocol */
    {0x01, "CW1602", 2, 16, 5, 7, 2, 2, 8, 1},
    {0x02, "CW12232", 4, 20, 6, 8, 2, 2, 16, 2},
    {0x03, "CW12832", 4, 21, 6, 8, 2, 2, 16, 2},
    {0xff, "Unknown", -1, -1, -1, -1, -1, -1, -1, -1}
};


/****************************************/
/***  hardware dependant functions    ***/
/****************************************/

static void drv_CW_process_input(void)
{
    while (RingRPos != RingWPos) {
	drv_generic_keypad_press(RingBuffer[RingRPos++]);
	if (RingRPos >= sizeof(RingBuffer))
	    RingRPos = 0;
    }
}


static int drv_CW_poll(void)
{
    while (1) {
	char buffer[32];
	int num, n;

	num = drv_generic_serial_poll(buffer, sizeof(buffer));
	if (num <= 0)
	    break;		/* no more input */

	/* put result into RingBuffer */
	for (n = 0; n < num; n++) {
	    RingBuffer[RingWPos++] = (unsigned char) buffer[n];
	    if (RingWPos >= sizeof(RingBuffer))
		RingWPos = 0;
	}
    }

    if (RingRPos != RingWPos)
	return 1;
    else
	return 0;
}


static void drv_CW_timer(void __attribute__ ((unused)) * notused)
{
    while (drv_CW_poll()) {
	drv_CW_process_input();
    }
}


static void drv_CW_send(const char *string, const int len)
{
    drv_generic_serial_write(string, len);
    usleep(20);
    if (drv_CW_poll())
	drv_CW_process_input();
}


static void drv_CW_write(const int row, const int col, const char *data, const int len)
{
    char cmd[6] = "\376Gxy\375";

    cmd[2] = (char) col;
    cmd[3] = (char) row;
    drv_CW_send(cmd, 5);
    drv_CW_send(data, len);
}


static void drv_CW1602_defchar(const int ascii, const unsigned char *buffer)
{
    int i;
    char cmd[12] = "\376Nn12345678\375";

    cmd[2] = (char) ascii;

    for (i = 0; i < 8; i++) {
	cmd[3 + i] = buffer[i] & 0x1f;
    }
    drv_CW_send(cmd, 12);
}


static void drv_CW12232_defchar(const int ascii, const unsigned char *buffer)
{
    int i, j;
    char cmd[10] = "\376Nn123456\375";	/* 0xfe 'N' [1..16] (6 Bytes Data) 0xfd */

    cmd[2] = (char) ascii;

    /* The CW12232 uses a vertical bitmap layout, */
    /* so we have to 'rotate' the bitmap. */

    for (i = 0; i < 6; i++) {
	cmd[3 + i] = 0;
	for (j = 0; j < 8; j++) {
	    if (buffer[j] & (1 << (5 - i))) {
		cmd[3 + i] |= (1 << j);
	    }
	}
    }
    drv_CW_send(cmd, 10);
}


static int drv_CW_GPO(const int num, const int val)
{
    /* Fixme: GPO's not yet implemented! */
    error("%s: GPO's not yet implemented!", Name);
    /* Fixme: num*val to avoid compiler warning */
    return num * val;
}


static int drv_CW_GPI(const int num)
{
    if (num < 0 || num > GPIS) {
	return 0;
    }
    error("%s: GPI's not yet implemented!", Name);
    return num;
}


static void drv_CW_clear(void)
{
#if 1
    drv_CW_send("\376X\375", 3);	/* Clear Display */
    usleep(500000);
#else
    /* for some mysterious reason, we have to sleep after  */
    /* the command _and_ after the CMD_END... */
    drv_CW_send("\376X", 2);	/* Clear Display */
    drv_CW_send("\375", 1);	/* Command End */
#endif
}


static int drv_CW_brightness(int brightness)
{
    static unsigned char Brightness = 0;
    char cmd[5] = "\376A_\375";

    /* -1 is used to query the current brightness */
    if (brightness == -1)
	return Brightness;

    if (brightness < 0)
	brightness = 0;
    if (brightness > 8)
	brightness = 8;
    Brightness = brightness;

    switch (Brightness) {
    case 0:
	/* backlight off */
	drv_CW_send("\376F\375", 3);
	break;
    case 8:
	/* backlight on */
	drv_CW_send("\376B\375", 3);
	break;
    default:
	/* backlight level */
	cmd[2] = (char) Brightness;
	drv_CW_send(cmd, 4);
	break;
    }

    return Brightness;
}


static int drv_CW_keypad(const int num)
{
    int val = WIDGET_KEY_PRESSED;

    switch (num) {
    case 65:
	val += WIDGET_KEY_UP;
	break;
    case 66:
	val += WIDGET_KEY_DOWN;
	break;
    case 67:
	val += WIDGET_KEY_LEFT;
	break;
    case 68:
	val += WIDGET_KEY_RIGHT;
	break;
    case 69:
	val += WIDGET_KEY_CONFIRM;
	break;
    case 70:
	val += WIDGET_KEY_CANCEL;
	break;
    default:
	error("%s: unknown keypad value %d", Name, num);
    }

    debug("%s: key %c (0x%x) pressed", Name, num, num);
    return val;
}


static int drv_CW_start(const char *section)
{
    int i;
    char *model;
    char buffer[16];

    model = cfg_get(section, "Model", NULL);
    if (model != NULL && *model != '\0') {
	for (i = 0; Models[i].type != 0xff; i++) {
	    if (strcasecmp(Models[i].name, model) == 0)
		break;
	}
	if (Models[i].type == 0xff) {
	    error("%s: %s.Model '%s' is unknown from %s", Name, section, model, cfg_source());
	    return -1;
	}
	Model = i;
	info("%s: using model '%s'", Name, Models[Model].name);
    } else {
	error("%s: no '%s.Model' entry from %s", Name, section, cfg_source());
	return -1;
    }

    /* open serial port */
    if (drv_generic_serial_open(section, Name, 0) < 0)
	return -1;

    /* read firmware version: 0xfe '1' 0xfd */
    drv_generic_serial_write("\3761\375", 3);
    usleep(100000);
    if (drv_generic_serial_read(buffer, 2) != 2) {
	info("unable to read firmware version!");
    } else {
	info("Cwlinux Firmware V%d.%d", (int) buffer[0], (int) buffer[1]);
    }

    /* read model mumber: 0xfe 0x30 0xfd */
    drv_generic_serial_write("\3760\375", 3);
    usleep(100000);
    if (drv_generic_serial_read(buffer, 2) != 2) {
	info("unable to read model number!");
    } else {
	info("Cwlinux model CW%d%d", (int) buffer[0], (int) buffer[1]);
    }

    /* initialize global variables */
    DROWS = Models[Model].rows;
    DCOLS = Models[Model].cols;
    XRES = Models[Model].xres;
    YRES = Models[Model].yres;
    GPOS = Models[Model].gpos;
    GPIS = Models[Model].gpis;
    CHARS = Models[Model].chars;
    Protocol = Models[Model].protocol;

    /* regularly process display input */
    timer_add(drv_CW_timer, NULL, 250, 0);

    drv_CW_clear();

    drv_CW_send("\376D\375", 3);	/* auto line wrap off */
    drv_CW_send("\376R\375", 3);	/* auto scroll off */
    drv_CW_send("\376K\375", 3);	/* underline cursor off */
    drv_CW_send("\376B\375", 3);	/* backlight on */

    /* set brightness */
    if (cfg_number(section, "Brightness", 0, 0, 8, &i) > 0) {
	drv_CW_brightness(i);
    }

    return 0;
}


/****************************************/
/***            plugins               ***/
/****************************************/


static void plugin_brightness(RESULT * result, const int argc, RESULT * argv[])
{
    double brightness;

    switch (argc) {
    case 0:
	brightness = drv_CW_brightness(-1);
	SetResult(&result, R_NUMBER, &brightness);
	break;
    case 1:
	brightness = drv_CW_brightness(R2N(argv[0]));
	SetResult(&result, R_NUMBER, &brightness);
	break;
    default:
	error("%s.brightness(): wrong number of parameters", Name);
	SetResult(&result, R_STRING, "");
    }
}


/****************************************/
/***        widget callbacks          ***/
/****************************************/

/* using drv_generic_text_draw(W) */
/* using drv_generic_text_icon_draw(W) */
/* using drv_generic_text_bar_draw(W) */
/* using drv_generic_gpio_draw(W) */
/* using drv_generic_keypad_draw(W) */


/****************************************/
/***        exported functions        ***/
/****************************************/


/* list models */
int drv_CW_list(void)
{
    int i;

    for (i = 0; Models[i].type != 0xff; i++) {
	printf("%s ", Models[i].name);
    }
    return 0;
}


/* initialize driver & display */
int drv_CW_init(const char *section, const int quiet)
{
    WIDGET_CLASS wc;
    int ret;

    info("%s: %s", Name, "$Rev: 929 $");

    /* display preferences */
    CHAR0 = 1;			/* ASCII of first user-defineable char */
    GOTO_COST = 3;		/* number of bytes a goto command requires */
    INVALIDATE = 1;		/* re-defined chars must be re-sent to the display */

    /* start display */
    if ((ret = drv_CW_start(section)) != 0)
	return ret;

    /* real worker functions */
    drv_generic_text_real_write = drv_CW_write;
    drv_generic_gpio_real_set = drv_CW_GPO;
    drv_generic_gpio_real_get = drv_CW_GPI;
    drv_generic_keypad_real_press = drv_CW_keypad;

    switch (Protocol) {
    case 1:
	drv_generic_text_real_defchar = drv_CW1602_defchar;
	break;
    case 2:
	drv_generic_text_real_defchar = drv_CW12232_defchar;
	break;
    }

    if (!quiet) {
	char buffer[40];
	qprintf(buffer, sizeof(buffer), "%s %s", Name, Models[Model].name);
	if (drv_generic_text_greet(buffer, "www.cwlinux.com")) {
	    sleep(3);
	    drv_CW_clear();
	}
    }

    /* initialize generic text driver */
    if ((ret = drv_generic_text_init(section, Name)) != 0)
	return ret;

    /* initialize generic icon driver */
    if ((ret = drv_generic_text_icon_init()) != 0)
	return ret;

    /* initialize generic bar driver */
    if ((ret = drv_generic_text_bar_init(0)) != 0)
	return ret;

    /* add fixed chars to the bar driver */
    drv_generic_text_bar_add_segment(0, 0, 255, 32);	/* ASCII 32 = blank */

    /* initialize generic GPIO driver */
    if ((ret = drv_generic_gpio_init(section, Name)) != 0)
	return ret;

    /* initialize generic key pad driver */
    if ((ret = drv_generic_keypad_init(section, Name)) != 0)
	return ret;

    /* register text widget */
    wc = Widget_Text;
    wc.draw = drv_generic_text_draw;
    widget_register(&wc);

    /* register icon widget */
    wc = Widget_Icon;
    wc.draw = drv_generic_text_icon_draw;
    widget_register(&wc);

    /* register bar widget */
    wc = Widget_Bar;
    wc.draw = drv_generic_text_bar_draw;
    widget_register(&wc);

    /* register plugins */
    AddFunction("LCD::brightness", -1, plugin_brightness);

    return 0;
}


/* close driver & display */
int drv_CW_quit(const int quiet)
{

    info("%s: shutting down.", Name);
    drv_generic_text_quit();
    drv_generic_gpio_quit();
    drv_generic_keypad_quit();

    /* clear display */
    drv_CW_clear();

    /* say goodbye... */
    if (!quiet) {
	drv_generic_text_greet("goodbye!", NULL);
    }

    drv_generic_serial_close();

    return (0);
}


DRIVER drv_Cwlinux = {
    .name = Name,
    .list = drv_CW_list,
    .init = drv_CW_init,
    .quit = drv_CW_quit,
};