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authorreinelt <>2001-03-14 15:30:53 +0000
committerreinelt <>2001-03-14 15:30:53 +0000
commit9aedfa206bcc9c1040e160f48e9292c28674ce30 (patch)
tree980add8eb29a7e98596d2e57e548d864862a950c /HD44780.c
parent2f04d31005ef11a13df9f7a8fc3a33accfc62593 (diff)
downloadlcd4linux-9aedfa206bcc9c1040e160f48e9292c28674ce30.tar.gz
[lcd4linux @ 2001-03-14 15:30:53 by reinelt]
make ppdev compatible to earlier kernels
Diffstat (limited to 'HD44780.c')
-rw-r--r--HD44780.c55
1 files changed, 34 insertions, 21 deletions
diff --git a/HD44780.c b/HD44780.c
index 6e0cd52..5a1d15a 100644
--- a/HD44780.c
+++ b/HD44780.c
@@ -1,4 +1,4 @@
-/* $Id: HD44780.c,v 1.15 2001/03/14 15:14:59 reinelt Exp $
+/* $Id: HD44780.c,v 1.16 2001/03/14 15:30:53 reinelt Exp $
*
* driver for display modules based on the HD44780 chip
*
@@ -20,6 +20,10 @@
*
*
* $Log: HD44780.c,v $
+ * Revision 1.16 2001/03/14 15:30:53 reinelt
+ *
+ * make ppdev compatible to earlier kernels
+ *
* Revision 1.15 2001/03/14 15:14:59 reinelt
* added ppdev parallel port access
*
@@ -133,6 +137,7 @@
#include <linux/ppdev.h>
#endif
+
#if !defined(WITH_OUTB) && !defined(WITH_PPDEV)
#error neither outb() nor ppdev() possible
#error cannot compile HD44780 driver
@@ -166,14 +171,10 @@ typedef struct {
static LCD Lcd;
-#ifdef WITH_OUTB
static unsigned short Port=0;
-#endif
-#ifdef WITH_PPDEV
static char *PPdev=NULL;
static int PPfd=-1;
-#endif
static char Txt[4][40];
static BAR Bar[4][40];
@@ -199,11 +200,11 @@ static void HD_toggle (int bit)
static void HD_command (unsigned char cmd, int delay)
{
+#ifdef WITH_PPDEV
if (PPdev) {
-#ifdef WITH_PPDEV
struct ppdev_frob_struct frob;
-
+
// clear RS (inverted)
frob.mask=PARPORT_CONTROL_AUTOFD;
frob.val=PARPORT_CONTROL_AUTOFD;
@@ -214,26 +215,28 @@ static void HD_command (unsigned char cmd, int delay)
// send command
HD_toggle(PARPORT_CONTROL_STROBE);
-
+
// wait
udelay(delay);
-#endif
} else {
-#ifdef WITH_OUTB
+#endif
+
outb (cmd, Port); // put data on DB1..DB8
outb (0x02, Port+2); // set Enable = bit 0 invertet
udelay (1);
outb (0x03, Port+2); // clear Enable
udelay (delay);
-#endif
-
+
+#ifdef WITH_PPDEV
}
+#endif
}
static void HD_write (char *string, int len, int delay)
{
+#ifdef WITH_PPDEV
if (PPdev) {
struct ppdev_frob_struct frob;
@@ -258,6 +261,8 @@ static void HD_write (char *string, int len, int delay)
} else {
+#endif
+
while (len--) {
outb (*string++, Port); // put data on DB1..DB8
outb (0x00, Port+2); // set Enable = bit 0 invertet
@@ -265,14 +270,15 @@ static void HD_write (char *string, int len, int delay)
outb (0x01, Port+2); // clear Enable
udelay (delay);
}
-
+#ifdef WITH_PPDEV
}
+#endif
}
static void HD_setGPO (int bits)
{
-
if (Lcd.gpos>0) {
+#ifdef WITH_PPDEV
if (PPdev) {
// put data on DB1..DB8
@@ -282,18 +288,24 @@ static void HD_setGPO (int bits)
HD_toggle(PARPORT_CONTROL_INIT);
} else {
+#endif
+
outb (bits, Port); // put data on DB1..DB8
outb (0x05, Port+2); // set INIT = bit 2 invertet
udelay (1);
outb (0x03, Port+2); // clear INIT
udelay (1);
+
+#ifdef WITH_PPDEV
}
+#endif
}
}
static int HD_open (void)
{
+#ifdef WITH_PPDEV
if (PPdev) {
debug ("using ppdev %s", PPdev);
PPfd=open(PPdev, O_RDWR);
@@ -312,14 +324,15 @@ static int HD_open (void)
return -1;
}
} else {
-
+#endif
debug ("using raw port 0x%x", Port);
if (ioperm(Port, 3, 1)!=0) {
error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno));
return -1;
}
-
+#ifdef WITH_PPDEV
}
+#endif
HD_command (0x30, 4100); // 8 Bit mode, wait 4.1 ms
HD_command (0x30, 100); // 8 Bit mode, wait 100 us
@@ -529,14 +542,14 @@ int HD_init (LCD *Self)
}
PPdev=NULL;
if ((Port=strtol(s, &e, 0))==0 || *e!='\0') {
-#if 0
+#ifdef WITH_PPDEV
+ Port=0;
+ PPdev=s;
+#else
error ("HD44780: bad port '%s' in %s", s, cfg_file());
return -1;
#endif
- // use PPdev
- Port=0;
- PPdev=s;
- }
+ }
#ifdef USE_OLD_UDELAY
s=cfg_get ("Delay");