Подключение символьного ЖКИ к плате от WD MyBook Live на AppliedMicro APM82181. Окончание30.11.2016 08:19

root@lede: i2cdetect 0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-0.
I will probe address range 0x03-0x77.
Continue? [Y/n] y
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

#!/bin/sh

i2c_adres=0x27
i2c_dev=/sys/bus/i2c/devices/i2c-0/0-0027/eeprom

led=8
ansi=0

to_octal () {
	hh3=$(($hh / 64))
	hh1=$(($hh - $hh3 * 64))
	hh2=$(($hh1 / 8))
	hh1=$(($hh1 - $hh2 * 8))
}

write_CMD () {
: $((hb = $c & 240))
: $((lb = ($c << 4)  & 240 ))

	hh=$((4 + $hb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
	hh=$((0 + $hb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
	hh=$((4 + $lb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
	hh=$((0 + $lb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
}

print_LCD () {
: $((hb = $c & 240))
: $((lb = ($c << 4)  & 240 ))

	hh=$((5 + $hb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
	hh=$((1 + $hb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
	hh=$((5 + $lb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
	hh=$((1 + $lb + $led))
	to_octal 
	echo -e -n \\$hh3$hh2$hh1 >> $i2c_dev
}

##########  init LCD  #####################
init_LCD () {
if [[ ! -w $i2c_dev ]]
then 
	echo 24c00 0x27 > /sys/bus/i2c/devices/i2c-0/new_device
	sleep 0.5
fi
sleep 0.5
c=3
write_CMD
c=3
write_CMD
c=2
write_CMD
c=40 #28
write_CMD
c=44 #2C
write_CMD
c=44 #2C
write_CMD
c=12 #0C
write_CMD
c=1
write_CMD
sleep 0.2
c=6
write_CMD
c=2
write_CMD
}
###############################

init_LCD

	c=0x80 # stroka - 1
	write_CMD
	for i in `seq 32 63`; do
		if [ "$i" == 48 ]; then
			c=0xC0 # stroka - 2
			write_CMD
		fi
	c=$(($i + $ansi))
	print_LCD
	done
        sleep 3

	c=0x80 # stroka - 1
	write_CMD
	for i in `seq 64 95`; do
		if [ "$i" == 80 ]; then
			c=0xC0 # stroka - 2
			write_CMD
		fi
	c=$(($i + $ansi))
	print_LCD
	done
        sleep 3

	c=0x80 # stroka - 1
	write_CMD
	for i in `seq 96 127`; do
		if [ "$i" == 112 ]; then
			c=0xC0 # stroka - 2
			write_CMD
		fi
	c=$(($i + $ansi))
	print_LCD
	done

Display HD44780-I2C {
    Driver 'HD44780'
    Model 'generic'
    Bus 'i2c'
    Port '/dev/i2c-0'
    Device '0x27'
    Bits '4'
    Size '16x2'
    asc255bug 0
    Icons 1
    Wire {
        RW     'DB1'
        RS     'DB0'
        ENABLE 'DB2'
        GPO    'GND'
    }
}

root@lede: /usr/bin/lcd4linux -v -F

LCD4Linux 0.11.0-SVN-1193 starting
HD44780: $Rev: 1202 $
HD44780: using model 'generic'
HD44780: using I2C bus
HD44780: using 1 Controller(s)
HD44780: using 4 bit mode
udelay: using gettimeofday() delay loop
Segmentation fault

ls -l
-rw-r--r-- 1 root root 18092 Feb 21  2016 LICENSE
-rw-r--r-- 1 root root    60 Nov  9 06:17 Makefile
-rw-r--r-- 1 root root  1945 Feb 21  2016 README.md
-rw-r--r-- 1 root root 10316 Nov 16 04:33 hd44780-dev.c
-rw-r--r-- 1 root root  7756 Feb 21  2016 hd44780-i2c.c
-rw-r--r-- 1 root root  1122 Nov 16 03:28 hd44780.h
-rw-r--r-- 1 root root   235 Feb 21  2016 make.sh

include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk

PKG_NAME:=hd44780
PKG_RELEASE:=1
PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk

define KernelPackage/hd44780
SUBMENU:=Other modules
TITLE:=I2C HD44780 driver
FILES:=$(PKG_BUILD_DIR)/hd44780.ko
AUTOLOAD:=$(call AutoLoad,70,hd44780)
KCONFIG:=
endef

define Package/hd44780/description
Big comments....
...
endef

MAKE_OPTS:= \
	ARCH="$(LINUX_KARCH)" \
	CROSS_COMPILE="$(TARGET_CROSS)" \
	SUBDIRS="$(PKG_BUILD_DIR)" \
	EXTRA_CFLAGS="$(EXTRA_CFLAGS)"

define Build/Prepare
	mkdir -p $(PKG_BUILD_DIR)
	$(CP) ./src/* $(PKG_BUILD_DIR)/
endef

define Build/Compile
	$(MAKE) -C "$(LINUX_DIR)" \
		$(MAKE_OPTS) \
		modules
endef

$(eval $(call KernelPackage,hd44780))

static void hd44780_handle_esc_seq_char(struct hd44780 *lcd, char ch)
{
	int prev_row, prev_col;

	lcd->esc_seq_buf.buf[lcd->esc_seq_buf.length++] = ch;

	if (!strcmp(lcd->esc_seq_buf.buf, "[2J")) {
		prev_row = lcd->pos.row;
		prev_col = lcd->pos.col;

		hd44780_clear_display(lcd);
		hd44780_write_instruction(lcd, HD44780_DDRAM_ADDR | (lcd->geometry->start_addrs[prev_row] + prev_col));

		hd44780_leave_esc_seq(lcd);
	} else if (!strcmp(lcd->esc_seq_buf.buf, "[H")) {
		hd44780_write_instruction(lcd, HD44780_RETURN_HOME);
		lcd->pos.row = 0;
		lcd->pos.col = 0;

		hd44780_leave_esc_seq(lcd);
	} else if (lcd->esc_seq_buf.length == ESC_SEQ_BUF_SIZE) {
		hd44780_flush_esc_seq(lcd);
	}
}

static void hd44780_handle_esc_seq_char(struct hd44780 *lcd, char ch)
{
	int prev_row, prev_col;
	struct hd44780_geometry *geo = lcd->geometry;

	lcd->esc_seq_buf.buf[lcd->esc_seq_buf.length++] = ch;

	if (!strcmp(lcd->esc_seq_buf.buf, "[2J")) {
		prev_row = lcd->pos.row;
		prev_col = lcd->pos.col;

		hd44780_clear_display(lcd);
		hd44780_write_instruction(lcd, HD44780_DDRAM_ADDR | (lcd->geometry->start_addrs[prev_row] + prev_col));

		hd44780_leave_esc_seq(lcd);
	} else if (!strcmp(lcd->esc_seq_buf.buf, "[H")) {
		hd44780_write_instruction(lcd, HD44780_RETURN_HOME);
		lcd->pos.row = 0;
		lcd->pos.col = 0;

		hd44780_leave_esc_seq(lcd);
	} else if ((lcd->esc_seq_buf.buf[0]=='[') && (lcd->esc_seq_buf.buf[4]=='H') && // Esc[ Line ; Column H
		(lcd->esc_seq_buf.buf[2]==';' ) && (lcd->esc_seq_buf.length == 5)) {
		lcd->pos.row = lcd->esc_seq_buf.buf[1] % geo->rows;
		lcd->pos.col = lcd->esc_seq_buf.buf[3] % geo->cols;
		hd44780_write_instruction(lcd, HD44780_DDRAM_ADDR
		    | (geo->start_addrs[lcd->pos.row] + lcd->pos.col));
		hd44780_leave_esc_seq(lcd);
	} else if (lcd->esc_seq_buf.length == ESC_SEQ_BUF_SIZE) {
		hd44780_flush_esc_seq(lcd);
	}
}

static int drv_vt100_open(const char *section)
{
    char *s;
    int f = -1;
    s = cfg_get(section, "Port", NULL);
    if (s == NULL || *s == '\0' || strlen(s) > 80) {
	error("%s: no '%s.Port' entry from %s", Name, section, cfg_source());
	return -1;
    }
    strcpy(Port, s);
    f = open(Port, O_WRONLY);
    if (f == -1) {
	error("open(%s) failed: %s", Port, strerror(errno));
	return -1;
    }
    close (f);
    return 0;
}

static void drv_vt100_send(const char *data, const unsigned int len)
{
    unsigned int i;
    int f;
    f = open(Port, O_WRONLY);
    write (f, data, len);
    close (f);
}

static void drv_vt100_clear(void)
{
    char cmd[4];
    cmd[0] = 0x1B; // ESC
    cmd[1] = '[';  // [
    cmd[2] = '2';  // 2
    cmd[3] = 'J';  // J
    drv_vt100_send(cmd, 4);
    cmd[2] = 'H';  // H
    drv_vt100_send(cmd, 3);
}

static void drv_vt100_write(const int row, const int col, const char *data, int len)
{
    char cmd[6];
    cmd[0] = 0x1B; 		// ESC
    cmd[1] = '[';  		// [
    cmd[2] = row & 0xff;	// Line
    cmd[3] = ';';		// ;
    cmd[4] = col & 0xff;	// Column
    cmd[5] = 'H';		// H
    drv_vt100_send(cmd, 6);
}

diff -Naur ./vt100/Makefile.am ./vt100-f/Makefile.am
--- ./vt100/Makefile.am	2016-11-28 11:01:56.000000000 +0000
+++ ./vt100-f/Makefile.am	2016-11-14 07:33:41.000000000 +0000
@@ -125,6 +125,7 @@
 drv_USBHUB.c                  \
 drv_USBLCD.c                  \
 drv_vnc.c                     \
+drv_vt100.c                   \
 drv_WincorNixdorf.c           \
 drv_X11.c                     \
                               \
diff -Naur ./vt100/drivers.m4 ./vt100-f/drivers.m4
--- ./vt100/drivers.m4	2016-11-14 11:54:41.000000000 +0000
+++ ./vt100-f/drivers.m4	2016-11-14 07:37:00.000000000 +0000
@@ -39,7 +39,7 @@
   [                        Newhaven, Noritake, NULL, Pertelian, PHAnderson,]
   [                        PICGraphic, picoLCD, picoLCDGraphic, PNG, PPM, RouterBoard,]
   [                        Sample, SamsungSPF, serdisplib, ShuttleVFD, SimpleLCD, st2205, T6963,]
-  [                        TeakLCM, TEW673GRU, Trefon, ULA200, USBHUB, USBLCD, VNC, WincorNixdorf, X11],
+  [                        TeakLCM, TEW673GRU, Trefon, ULA200, USBHUB, USBLCD, VNC, vt100, WincorNixdorf, X11],
   drivers=$withval,
   drivers=all
 )
@@ -114,6 +114,7 @@
 	 USBHUB="yes"
          USBLCD="yes"
          VNC="yes"
+         VT100="yes"
 	 WINCORNIXDORF="yes"
          X11="yes"
          ;;
@@ -279,6 +280,9 @@
       VNC)
          VNC=$val
          ;;
+      vt100)
+         VT100=$val
+         ;;
       WincorNixdorf)
          WINCORNIXDORF=$val
          ;;
@@ -869,6 +873,13 @@
    fi
 fi
 
+if test "$VT100" = "yes"; then
+   TEXT="yes"
+   I2C="yes"
+   DRIVERS="$DRIVERS drv_vt100.o"
+   AC_DEFINE(WITH_VT100,1,[vt100 driver])
+fi
+
 if test "$WINCORNIXDORF" = "yes"; then
    TEXT="yes"
    SERIAL="yes"

Variables {
   tick 500
   tack 100
   minute 60000
}
Display VT100 {
    Driver 'vt100'
    Size '16x2'
    Port '/dev/lcd0'
}
Widget Test {
    class 'Text'
    expression '1234567890123456'
    width 16
}
Layout Test {
    Row01.Col1 'Test'
    Row02.Col1 'Test'
}
Display 'VT100'
Layout 'Test'

root@lede:/# /usr/bin/lcd4linux -v -F
LCD4Linux 0.11.0-SVN-1193 starting
vt100: $Rev: 001 $
initializing layout 'Test'
Creating new timer group (1000 ms)
 widget 'Test': Class 'text', Parent '', Layer 1, Row 0, Col 0 (to 0,16)
 widget 'Test': Class 'text', Parent 'Test', Layer 1, Row 1, Col 0 (to 1,16)

static void hd44780_handle_esc_seq_char(struct hd44780 *lcd, char ch)
{
	int prev_row, prev_col;
	struct hd44780_geometry *geo = lcd->geometry;

	if (lcd->is_in_set_char == 0) {
		lcd->esc_seq_buf.buf[lcd->esc_seq_buf.length++] = ch;
		if (!strcmp(lcd->esc_seq_buf.buf, "[2J")) {
			prev_row = lcd->pos.row;
			prev_col = lcd->pos.col;
			hd44780_clear_display(lcd);
			hd44780_write_instruction(lcd, HD44780_DDRAM_ADDR | (lcd->geometry->start_addrs[prev_row] + prev_col));
			hd44780_leave_esc_seq(lcd);
		} else if (!strcmp(lcd->esc_seq_buf.buf, "[H")) {
			hd44780_write_instruction(lcd, HD44780_RETURN_HOME);
			lcd->pos.row = 0;
			lcd->pos.col = 0;
			hd44780_leave_esc_seq(lcd);
		} else if ((lcd->esc_seq_buf.buf[0]=='[') && (lcd->esc_seq_buf.buf[4]=='H') && // Esc[ Line ; Column H
			(lcd->esc_seq_buf.buf[2]==';' ) && (lcd->esc_seq_buf.length == 5)) {
			lcd->pos.row = lcd->esc_seq_buf.buf[1] % geo->rows;
			lcd->pos.col = lcd->esc_seq_buf.buf[3] % geo->cols;
			hd44780_write_instruction(lcd, HD44780_DDRAM_ADDR
			    | (geo->start_addrs[lcd->pos.row] + lcd->pos.col));
			hd44780_leave_esc_seq(lcd);
		} else if (!strcmp(lcd->esc_seq_buf.buf, "(S")) { // Esc(S code matrix(8)
			lcd->is_in_set_char = 1;
		} else if (lcd->esc_seq_buf.length == ESC_SEQ_BUF_SIZE) {
			hd44780_flush_esc_seq(lcd);
		}

	} else if (lcd->is_in_set_char == 1) { // start set CGRAM code
		hd44780_write_instruction(lcd, HD44780_CGRAM_ADDR | 8 * (ch & 0x07));
		lcd->is_in_set_char++;
	} else {
		hd44780_write_data(lcd, ch & 0x1f); // set 8 bytes CGRAM code
		lcd->is_in_set_char++;
		if (lcd->is_in_set_char == 10){ // go to DDRAM mode
			hd44780_write_instruction(lcd, HD44780_DDRAM_ADDR
			    | (geo->start_addrs[lcd->pos.row] + lcd->pos.col));
			hd44780_leave_esc_seq(lcd);
	    }
	}
}

 void hd44780_write(struct hd44780 *lcd, const char *buf, size_t count)
...
 			case '\e':
 				lcd->is_in_esc_seq = true;
				lcd->is_in_set_char = 0;
 				break;
 			default:
 				hd44780_write_char(lcd, ch);
...

struct hd44780 {
	struct cdev cdev;
	struct device *device;
	struct i2c_client *i2c_client;
	struct hd44780_geometry *geometry;
	struct {
		int row;
		int col;
	} pos;
	char buf[BUF_SIZE];
	struct {
		char buf[ESC_SEQ_BUF_SIZE];
		int length;
	} esc_seq_buf;
	bool is_in_esc_seq;
	int is_in_set_char;
	bool backlight;
	bool cursor_blink;
	bool cursor_display;
	bool dirty;
	struct mutex lock;
	struct list_head list;
};

static void drv_vt100_defchar(const int ascii, const unsigned char *matrix)
{
    char cmd[12];
    int i;

    /* call the 'define character' function */
    cmd[0] = 0x1B; 		// ESC
    cmd[1] = '(';  		// (
    cmd[2] = 'S';		// S
    cmd[3] = ascii & 0x07;	// code

    /* send bitmap to the display */
    for (i = 0; i < 8; i++) {
	cmd[i + 4] = (*matrix++) & 0x1f;
    }
    drv_vt100_send(cmd, 12);
}

Variables {
   tick 500
   tack 100
   minute 60000
}
Display VT100 {
    Driver 'vt100'
    Size '16x2'
    Port '/dev/lcd0'
    Icons 1
}
Widget RAM {
    class  'Text'
    expression meminfo('MemFree')/1024
    postfix ' MB RAM'	
    width  11
    precision 0
    align  'R'
    update tick
}
Widget Busy {
    class 'Text'
    expression proc_stat::cpu('busy', 500)
    prefix 'Busy'	
    postfix '%'	
    width 9	
    precision 1
    align 'R'	
    update tick	
}	
Widget Uptime {
    class 'Text'
    expression uptime('%d days %H:%M:%S')
    width 20
    align 'R'
    prefix 'Up '
    update 1000
}
Widget Uptime {
    class 'Text'
    expression 'Up '.uptime('%d %H:%M:%S')
    width 16
    align 'L'
    update 1000
}
# Icons
Widget Timer {
    class 'Icon'
    speed 83
    Bitmap {
	Row1 '.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|'
	Row2 '.***.|.*+*.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.+++.|.+*+.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|'
	Row3 '*****|**+**|**++*|**+++|**++.|**++.|**+++|**+++|**+++|**+++|**+++|+++++|+++++|++*++|++**+|++***|++**.|++**.|++***|++***|++***|++***|++***|*****|'
	Row4 '*****|**+**|**+**|**+**|**+++|**+++|**+++|**+++|**+++|**+++|+++++|+++++|+++++|++*++|++*++|++*++|++***|++***|++***|++***|++***|++***|*****|*****|'
	Row5 '*****|*****|*****|*****|*****|***++|***++|**+++|*++++|+++++|+++++|+++++|+++++|+++++|+++++|+++++|+++++|+++**|+++**|++***|+****|*****|*****|*****|'
	Row6 '.***.|.***.|.***.|.***.|.***.|.***.|.**+.|.*++.|.+++.|.+++.|.+++.|.+++.|.+++.|.+++.|.+++.|.+++.|.+++.|.+++.|.++*.|.+**.|.***.|.***.|.***.|.***.|'
	Row7 '.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|'
	Row8 '.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|'
    }
}
Layout L16x2 {
    Row1 {
	Col1  'Uptime'
	col16 'Timer'
    }
    Row2 {
	Col1  'Busy'
	Col11 'RAM'
    }
}
Display 'VT100'
Layout 'L16x2'

--- a/lcd4linux.conf.sample	2016-11-15 09:47:46.000000000 +0000
+++ a-f/lcd4linux.conf.sample	2016-11-18 03:18:22.000000000 +0000
@@ -567,7 +567,14 @@
     HttpPort	 '5800'
 }
 
-
+Display VT100 {
+    Driver 'vt100'
+    Size '16x2'
+    Port '/dev/lcd0'
+    Icons 1
+}
+            
+            
 Display FutabaVFD {
     Driver 'FutabaVFD'
     Port '/dev/parport0'	
@@ -674,7 +681,7 @@
 
 Widget RAM {
     class  'Text'
-    expression meminfo('MemTotal')/1024
+    expression meminfo('MemFree')/1024
     postfix ' MB RAM'	
     width  11
     precision 0
@@ -828,6 +835,14 @@
     update 1000
 }
 
+Widget Uptime {
+    class 'Text'
+    expression 'Up '.uptime('%d %H:%M:%S')
+    width 16
+    align 'L'
+    update 1000
+}
+
 Widget mpris_TrackPosition_bar {
     class 'Bar'
     expression  mpris_dbus::method_PositionGet('org.kde.amarok')
@@ -1015,7 +1030,7 @@
 
 Widget Timer {
     class 'Icon'
-    speed 50
+    speed 83
     Bitmap {
 	Row1 '.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|.....|'
 	Row2 '.***.|.*+*.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.*++.|.+++.|.+*+.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|.+**.|'
@@ -1225,6 +1240,17 @@
     }
 }
 
+Layout L16x2-2 {
+    Row1 {
+	Col1  'Uptime'
+	col16 'Timer'
+    }
+    Row2 {
+	Col1  'Busy'
+	Col11 'RAM'
+    }
+}
+
 Layout L20x2 {
     Row1 {
         Col1  'CPUinfo'
@@ -1323,7 +1349,7 @@
 
 
 
-Display 'ACool'
+#Display 'ACool'
 #Display 'SerDispLib'
 #Display 'LCD-Linux'
 #Display 'LCD2041'
@@ -1354,7 +1380,7 @@
 #Display 'IRLCD'
 #Display 'USBLCD'
 #Display 'BWCT'
-#Display 'Image'
+Display 'Image'
 #Display 'TeakLCD'
 #Display 'Trefon'
 #Display 'LCD2USB'
@@ -1363,15 +1389,17 @@
 #Display 'ctinclud'
 #Display 'picoLCD'
 #Display 'VNC'
+Display 'VT100'
 #Display 'FutabaVFD'
 #Display 'GLCD2USB'
 
-#Layout 'Default'
-Layout 'TestLayer'
+Layout 'Default'
+#Layout 'TestLayer'
 #Layout 'TestImage'
 #Layout 'L8x2'
 #Layout 'L16x1'
 #Layout 'L16x2'
+Layout 'L16x2-2'
 #Layout 'L20x2'
 #Layout 'L40x2'
 #Layout 'Test'

static void pcf8574_raw_write(struct hd44780 *lcd, u8 data)
{
	i2c_smbus_write_byte(lcd->i2c_client, data);
}

static void hd44780_write_nibble(struct hd44780 *lcd, dest_reg reg, u8 data)
{
	data = (data << 4) & 0xF0;
	if (reg == DR)
		data |= RS;
	data = data | (RW & 0x00);
	if (lcd->backlight)
		data |= BL;
	pcf8574_raw_write(lcd, data);
	pcf8574_raw_write(lcd, data | E);
	pcf8574_raw_write(lcd, data);
}

static void hd44780_write_data(struct hd44780 *lcd, u8 data)
{
	u8 h = (data >> 4) & 0x0F;
	u8 l = data & 0x0F;
	hd44780_write_nibble(lcd, DR, h);
	hd44780_write_nibble(lcd, DR, l);
	udelay(37 + 4);
}

static void hd44780_write_data(struct hd44780 *lcd, u8 data)
{
	u8 h = (data >> 4) & 0x0F;
	u8 l = data & 0x0F;
	u8 buf[5];
	h = (h << 4) & 0xF0;
	l = (l << 4) & 0xF0;
	h |= RS;
	l |= RS;
	h = h | (RW & 0x00);
	l = l | (RW & 0x00);
	if (lcd->backlight){
		h |= BL;
		l |= BL;
	}
	buf[0] = h | E;
	buf[1] = h;
	buf[2] = l;
	buf[3] = l | E;
	buf[4] = l;
	i2c_smbus_write_i2c_block_data(lcd->i2c_client, h, 5, (const u8 *)(&buf[0]));
	udelay(37 + 4);
}