HD44780 backlight initialization disable patch

? RGB-patch.diff
Index: hd44780-piplate.c
===================================================================
RCS file: /cvsroot/lcdproc/lcdproc/server/drivers/hd44780-piplate.c,v
retrieving revision 1.1
diff -u -5 -p -r1.1 hd44780-piplate.c
--- hd44780-piplate.c   7 Apr 2013 11:50:29 -0000   1.1
+++ hd44780-piplate.c   22 Feb 2014 08:04:37 -0000
@@ -209,22 +209,22 @@ hd_init_i2c_piplate(Driver *drvthis)
    i2c_write_reg(p, MCP23017_IODIRA,
              (unsigned char) (L_KEY_BIT | U_KEY_BIT | D_KEY_BIT | R_KEY_BIT | S_KEY_BIT) & ~(G_BIT | R_BIT));

    /* IODIRB - LCD control/data bus signals as outputs */
    i2c_write_reg(p, MCP23017_IODIRB,
-             (unsigned char) ~(RS_BIT | RW_BIT | EN_BIT | D0_BIT | D1_BIT | D2_BIT | D3_BIT | B_BIT));
+             (unsigned char) ~(RS_BIT | RW_BIT | EN_BIT | D0_BIT | D1_BIT | D2_BIT | D3_BIT ));//B_BIT));

    /* GPPUA - Pullups for key switch inputs */
    i2c_write_reg(p, MCP23017_GPPUA,
              (unsigned char) (L_KEY_BIT | U_KEY_BIT | D_KEY_BIT | R_KEY_BIT | S_KEY_BIT) & ~(G_BIT | R_BIT));

    /* GPPUB - Pullups disabled */
    i2c_write_reg(p, MCP23017_GPPUB, (unsigned char) 0x00);

    /* Set driver functions */
    hd44780_functions->senddata = i2c_piplate_HD44780_senddata;
-   hd44780_functions->backlight = i2c_piplate_HD44780_backlight;
+   hd44780_functions->backlight = NULL; //i2c_piplate_HD44780_backlight;
    hd44780_functions->scankeypad = i2c_piplate_HD44780_scankeypad;
    hd44780_functions->close = i2c_piplate_HD44780_close;

    /* Initialize the LCD */
    hd44780_functions->senddata(p, 0, RS_INSTR, 0x33);
@@ -278,12 +278,12 @@ i2c_piplate_HD44780_senddata(PrivateData
            write_val &= ~RS_BIT;
        else
            write_val |= RS_BIT;

        /* Set the blue backlight bit if backlight is on */
-       if (p->backlightstate == BACKLIGHT_OFF)
-           write_val |= B_BIT;
+       //if (p->backlightstate == BACKLIGHT_OFF)
+       //  write_val |= R_BIT;

        /* Set enable bit */
        i2c_write_reg(p, MCP23017_GPIOB, write_val | EN_BIT);

        p->hd44780_functions->uPause(p, 1);
@@ -319,22 +319,22 @@ i2c_piplate_HD44780_backlight(PrivateDat
    if (i2c_read_reg(p, MCP23017_GPIOB, &gpiob) != 0) {
        return;
    }

    /* Set or clear the RGB bits. Backlight is ON if the bits are CLEAR */
-   if (state == BACKLIGHT_ON) {
-       gpioa &= ~(R_BIT | G_BIT);
-       gpiob &= ~(B_BIT);
-   }
-   else {
-       gpioa |= (R_BIT | G_BIT);
-       gpiob |= (B_BIT);
-   }
+   //if (state == BACKLIGHT_ON) {
+   //  gpioa &= ~(R_BIT | G_BIT);
+   //  gpiob &= ~(B_BIT);
+   //}
+   //else {
+   //  gpioa |= (R_BIT | G_BIT);
+   //  gpiob |= (B_BIT);
+   //}

    /* Write the RGB bits */
-   i2c_write_reg(p, MCP23017_GPIOA, gpioa);
-   i2c_write_reg(p, MCP23017_GPIOB, gpiob);
+   //i2c_write_reg(p, MCP23017_GPIOA, gpioa);
+   //i2c_write_reg(p, MCP23017_GPIOB, gpiob);
 }

 /**
  * Scan the LCD keys
  * \param p      Pointer to driver's private data structure.
Index: hd44780.c
===================================================================
RCS file: /cvsroot/lcdproc/lcdproc/server/drivers/hd44780.c,v
retrieving revision 1.110
diff -u -5 -p -r1.110 hd44780.c
--- hd44780.c   29 Jan 2014 21:48:04 -0000  1.110
+++ hd44780.c   22 Feb 2014 08:04:38 -0000
@@ -156,11 +156,11 @@ HD44780_init(Driver *drvthis)
    p->cellheight = 8;  /* Do not change this !!! This is a
                 * controller property, not a display
                 * property !!! */
    p->cellwidth = 5;
    p->ccmode = standard;
-   p->backlightstate = -1; /* Init to invalid value */
+   p->backlightstate = 1;  /* Init to invalid value */
    p->fd = -1;


    /* READ THE CONFIG FILE */

@@ -397,14 +397,14 @@ HD44780_init(Driver *drvthis)
    /* consistency check: no local output function => no output */
    if (p->hd44780_functions->output == NULL)
        p->have_output = 0;

    /* set contrast */
-   HD44780_set_contrast(drvthis, p->contrast);
+   //HD44780_set_contrast(drvthis, p->contrast);

    /* Display startup parameters on the LCD */
-   HD44780_clear(drvthis);
+   //HD44780_clear(drvthis);
    sprintf(buf, "HD44780 %dx%d", p->width, p->height);
    HD44780_string(drvthis, 1, 1, buf);
    switch(if_type) {
      case IF_TYPE_USB:
        sprintf(buf, "USB %s%s%s",
@@ -876,11 +876,11 @@ HD44780_set_brightness(Driver *drvthis,

    /*
     * Make last backlight state invalid to force update on next
     * rendering
     */
-   p->backlightstate = -1;
+   //p->backlightstate = -1;
 }


 /**
  * Turn the LCD backlight on or off.
@@ -895,11 +895,11 @@ HD44780_backlight(Driver *drvthis, int o
    /* Immediately return if no backlight is available or no change is necessary */
    if (!p->have_backlight || p->backlightstate == on)
        return;

    if (p->hd44780_functions->backlight != NULL)
-       p->hd44780_functions->backlight(p, on);
+   //  p->hd44780_functions->backlight(p, on);

    p->backlightstate = on;
 }