~siretart/lcd4linux/debian

/* $Id: drv_picoLCD.c 1143 2011-02-12 22:46:19Z mzuther $

 * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_picoLCD.c $

 *

 * driver for picoLCD displays from mini-box.com

 *

 * Copyright (C) 2005 Michael Reinelt <michael@reinelt.co.at>

 * Copyright (C) 2005, 2006, 2007 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>

 *

 * Copyright (C) 2007 Nicu Pavel, Mini-Box.com <npavel@mini-box.com>

 *

 * 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_picoLCD

 *

 */

#include "config.h"

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <termios.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <sys/time.h>

#include <usb.h>

#include "debug.h"

#include "cfg.h"

#include "qprintf.h"

#include "udelay.h"

#include "plugin.h"

#include "widget.h"

#include "widget_text.h"

#include "widget_icon.h"

#include "widget_bar.h"

#include "drv.h"

#include "drv_generic_text.h"

#include "drv_generic_gpio.h"

#include "drv_generic_keypad.h"

#define picoLCD_VENDOR  0x04d8

#define picoLCD_DEVICE  0x0002

static char Name[] = "picoLCD";

static unsigned int gpo = 0;

static char *Buffer;

static char *BufPtr;

static usb_dev_handle *lcd;

/****************************************/

/***  hardware dependant functions    ***/

/****************************************/

static int drv_pL_open(void)

{

    struct usb_bus *busses, *bus;

    struct usb_device *dev;

    char driver[1024];

    char product[1024];

    char manufacturer[1024];

    char serialnumber[1024];

    int ret;

    lcd = NULL;

    info("%s: scanning for picoLCD...", Name);

    usb_set_debug(0);

    usb_init();

    usb_find_busses();

    usb_find_devices();

    busses = usb_get_busses();

    for (bus = busses; bus; bus = bus->next) {

	for (dev = bus->devices; dev; dev = dev->next) {

	    if ((dev->descriptor.idVendor == picoLCD_VENDOR) && (dev->descriptor.idProduct == picoLCD_DEVICE)) {

		info("%s: found picoLCD on bus %s device %s", Name, bus->dirname, dev->filename);

		lcd = usb_open(dev);

		ret = usb_get_driver_np(lcd, 0, driver, sizeof(driver));

		if (ret == 0) {

		    info("%s: interface 0 already claimed by '%s'", Name, driver);

		    info("%s: attempting to detach driver...", Name);

		    if (usb_detach_kernel_driver_np(lcd, 0) < 0) {

			error("%s: usb_detach_kernel_driver_np() failed!", Name);

			return -1;

		    }

		}

		usb_set_configuration(lcd, 1);

		usleep(100);

		if (usb_claim_interface(lcd, 0) < 0) {

		    error("%s: usb_claim_interface() failed!", Name);

		    return -1;

		}

		usb_set_altinterface(lcd, 0);

		usb_get_string_simple(lcd, dev->descriptor.iProduct, product, sizeof(product));

		usb_get_string_simple(lcd, dev->descriptor.iManufacturer, manufacturer, sizeof(manufacturer));

		usb_get_string_simple(lcd, dev->descriptor.iSerialNumber, serialnumber, sizeof(serialnumber));

		info("%s: Manufacturer='%s' Product='%s' SerialNumber='%s'", Name, manufacturer, product, serialnumber);

		return 0;

	    }

	}

    }

    error("%s: could not find a picoLCD", Name);

    return -1;

}

static int drv_pL_close(void)

{

    usb_release_interface(lcd, 0);

    usb_close(lcd);

    return 0;

}

static void drv_pL_send(unsigned char *data, int size)

{

    usb_interrupt_write(lcd, USB_ENDPOINT_OUT + 1, (char *) data, size, 1000);

}

static int drv_pL_read(unsigned char *data, int size)

{

    return usb_interrupt_read(lcd, USB_ENDPOINT_OUT + 1, (char *) data, size, 1000);

}

static void drv_pL_clear(void)

{

    unsigned char cmd[1] = { 0x94 };	/* clear display */

    drv_pL_send(cmd, 1);

}

static int drv_pL_contrast(int contrast)

{

    unsigned char cmd[2] = { 0x92 };	/* set contrast */

    if (contrast < 0)

	contrast = 0;

    if (contrast > 255)

	contrast = 255;

    cmd[1] = contrast;

    drv_pL_send(cmd, 2);

    return contrast;

}

static int drv_pL_backlight(int backlight)

{

    unsigned char cmd[2] = { 0x91 };	/* set backlight */

    if (backlight < 0)

	backlight = 0;

    if (backlight > 1)

	backlight = 1;

    cmd[1] = backlight;

    drv_pL_send(cmd, 2);

    return backlight;

}

#define _USBLCD_MAX_DATA_LEN          24

#define IN_REPORT_KEY_STATE           0x11

static int drv_pL_gpi( __attribute__ ((unused))

		      int num)

{

    int ret;

    unsigned char read_packet[_USBLCD_MAX_DATA_LEN];

    ret = drv_pL_read(read_packet, _USBLCD_MAX_DATA_LEN);

    if ((ret > 0) && (read_packet[0] == IN_REPORT_KEY_STATE)) {

	debug("picoLCD: pressed key= 0x%02x\n", read_packet[1]);

	return read_packet[1];

    }

    return 0;

}

static int drv_pL_gpo(int num, int val)

{

    unsigned char cmd[2] = { 0x81 };	/* set GPO */

    if (num < 0)

	num = 0;

    if (num > 7)

	num = 7;

    if (val < 0)

	val = 0;

    if (val > 1)

	val = 1;

    /* set led bit to 1 or 0 */

    if (val)

	gpo |= 1 << num;

    else

	gpo &= ~(1 << num);

    cmd[1] = gpo;

    drv_pL_send(cmd, 2);

    return val;

}

static void drv_pL_write(const int row, const int col, const char *data, int len)

{

    unsigned char cmd[64];

    int i;

    cmd[0] = 0x98;		/* goto/write */

    cmd[1] = row;

    cmd[2] = col;

    cmd[3] = len;

    i = 4;

    while (len--) {

	cmd[i++] = *data++;

    }

    drv_pL_send(cmd, i);

}

static void drv_pL_defchar(const int ascii, const unsigned char *matrix)

{

    unsigned char cmd[10] = { 0x9c };	/* define character */

    int i;

    cmd[1] = ascii;

    for (i = 0; i < 8; i++) {

	cmd[i + 2] = *matrix++ & 0x1f;

    }

    drv_pL_send(cmd, 10);

}

static int drv_pL_start(const char *section, const int quiet)

{

    int rows = -1, cols = -1;

    int value;

    char *s;

    s = cfg_get(section, "Size", NULL);

    if (s == NULL || *s == '\0') {

	error("%s: no '%s.Size' entry from %s", Name, section, cfg_source());

	return -1;

    }

    if (sscanf(s, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) {

	error("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source());

	free(s);

	return -1;

    }

    DROWS = rows;

    DCOLS = cols;

    if (drv_pL_open() < 0) {

	return -1;

    }

    /* Init the command buffer */

    Buffer = (char *) malloc(1024);

    if (Buffer == NULL) {

	error("%s: command buffer could not be allocated: malloc() failed", Name);

	return -1;

    }

    BufPtr = Buffer;

    if (cfg_number(section, "Contrast", 0, 0, 255, &value) > 0) {

	info("Setting contrast to %d", value);

	drv_pL_contrast(value);

    }

    if (cfg_number(section, "Backlight", 0, 0, 1, &value) > 0) {

	info("Setting backlight to %d", value);

	drv_pL_backlight(value);

    }

    drv_pL_clear();		/* clear display */

    if (!quiet) {

	char buffer[40];

	qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);

	if (drv_generic_text_greet(buffer, "http://www.picolcd.com")) {

	    sleep(3);

	    drv_pL_clear();

	}

    }

    return 0;

}

/****************************************/

/***            plugins               ***/

/****************************************/

static void plugin_contrast(RESULT * result, RESULT * arg1)

{

    double contrast;

    contrast = drv_pL_contrast(R2N(arg1));

    SetResult(&result, R_NUMBER, &contrast);

}

static void plugin_backlight(RESULT * result, RESULT * arg1)

{

    double backlight;

    backlight = drv_pL_backlight(R2N(arg1));

    SetResult(&result, R_NUMBER, &backlight);

}

static void plugin_gpo(RESULT * result, RESULT * argv[])

{

    double gpo;

    gpo = drv_pL_gpo(R2N(argv[0]), R2N(argv[1]));

    SetResult(&result, R_NUMBER, &gpo);

}

/****************************************/

/***        widget callbacks          ***/

/****************************************/

/* using drv_generic_text_draw(W) */

/* using drv_generic_text_icon_draw(W) */

/* using drv_generic_text_bar_draw(W) */

/****************************************/

/***        exported functions        ***/

/****************************************/

/* list models */

int drv_pL_list(void)

{

    printf("picoLCD 20x2 Text LCD");

    return 0;

}

/* initialize driver & display */

int drv_pL_init(const char *section, const int quiet)

{

    WIDGET_CLASS wc;

    int ret;

    info("%s: %s", Name, "$Rev: 1143 $");

    /* display preferences */

    XRES = 5;			/* pixel width of one char  */

    YRES = 8;			/* pixel height of one char  */

    CHARS = 8;			/* number of user-defineable characters */

    CHAR0 = 0;			/* ASCII of first user-defineable char */

    GPOS = 8;

    GPIS = 1;

    INVALIDATE = 1;

    GOTO_COST = 2;		/* number of bytes a goto command requires */

    /* real worker functions */

    drv_generic_text_real_write = drv_pL_write;

    drv_generic_text_real_defchar = drv_pL_defchar;

    drv_generic_gpio_real_set = drv_pL_gpo;

    drv_generic_gpio_real_get = drv_pL_gpi;

    /* start display */

    if ((ret = drv_pL_start(section, quiet)) != 0)

	return ret;

    /* 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;

    drv_generic_text_bar_add_segment(0, 0, 255, 32);

    /* GPO's init */

    if ((ret = drv_generic_gpio_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::contrast", -1, plugin_contrast);

    AddFunction("LCD::backlight", -1, plugin_backlight);

    AddFunction("LCD::gpo", -1, plugin_gpo);

    return 0;

}

/* close driver & display */

int drv_pL_quit(const int quiet)

{

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

    drv_generic_text_quit();

    /* clear display */

    drv_pL_clear();

    /* say goodbye... */

    if (!quiet) {

	drv_generic_text_greet("goodbye!", NULL);

    }

    drv_pL_close();

    if (Buffer) {

	free(Buffer);

	Buffer = NULL;

	BufPtr = Buffer;

    }

    return (0);

}

DRIVER drv_picoLCD = {

    .name = Name,

    .list = drv_pL_list,

    .init = drv_pL_init,

    .quit = drv_pL_quit,

};