X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/usb-driver/blobdiff_plain/185be93e9d53875901248462ca1ea6bc5ccb3605..5e3d963bcb6112d798f674b876b167c633ff6b59:/parport.c

diff --git a/parport.c b/parport.c
new file mode 100644
index 0000000..9cf35cd
--- /dev/null
+++ b/parport.c
@@ -0,0 +1,168 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <linux/parport.h>
+#include <linux/ppdev.h>
+#include "usb-driver.h"
+#include "parport.h"
+
+static int parportfd = -1;
+
+int pp_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
+	int ret = 0;
+	int i;
+	unsigned long port;
+	unsigned char val;
+	static unsigned char last_pp_write = 0;
+
+	for (i = 0; i < num; i++) {
+		DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
+				(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
+				tr[i].fAutoinc, tr[i].dwOptions);
+
+		port = (unsigned long)tr[i].dwPort;
+		val = tr[i].Data.Byte;
+
+#ifdef DEBUG
+		if (tr[i].cmdTrans == 13)
+			DPRINTF("write byte: %d\n", val);
+#endif
+
+		if (parportfd < 0)
+			return ret;
+
+		if (port == ppbase + PP_DATA) {
+			DPRINTF("data port\n");
+			switch(tr[i].cmdTrans) {
+				case PP_READ:
+					ret = 0; /* We don't support reading of the data port */
+					break;
+
+				case PP_WRITE:
+					ret = ioctl(parportfd, PPWDATA, &val);
+					last_pp_write = val;
+					break;
+
+				default:
+					fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
+					ret = -1;
+					break;
+			}
+		} else if (port == ppbase + PP_STATUS) {
+			DPRINTF("status port (last write: %d)\n", last_pp_write);
+			switch(tr[i].cmdTrans) {
+				case PP_READ:
+					ret = ioctl(parportfd, PPRSTATUS, &val);
+#ifdef FORCE_PC3_IDENT
+					val &= 0x5f;
+					if (last_pp_write & 0x40)
+						val |= 0x20;
+					else
+						val |= 0x80;
+#endif
+					break;
+
+				case PP_WRITE:
+					ret = 0; /* Status Port is readonly */
+					break;
+
+				default:
+					fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
+					ret = -1;
+					break;
+			}
+		} else if (port == ppbase + PP_CONTROL) {
+			DPRINTF("control port\n");
+			switch(tr[i].cmdTrans) {
+				case PP_READ:
+					ret = ioctl(parportfd, PPRCONTROL, &val);
+					break;
+
+				case PP_WRITE:
+					ret = ioctl(parportfd, PPWCONTROL, &val);
+					break;
+
+				default:
+					fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
+					ret = -1;
+					break;
+			}
+		} else if ((port == ecpbase + PP_ECP_CFGA) && ecpbase) {
+			DPRINTF("ECP_CFGA port\n");
+		} else if ((port == ecpbase + PP_ECP_CFGB) && ecpbase) {
+			DPRINTF("ECP_CFGB port\n");
+		} else if ((port == ecpbase + PP_ECP_ECR) && ecpbase) {
+			DPRINTF("ECP_ECR port\n");
+		} else {
+			DPRINTF("access to unsupported address range!\n");
+			ret = 0;
+		}
+
+		tr[i].Data.Byte = val;
+
+		DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
+				(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
+				tr[i].fAutoinc, tr[i].dwOptions);
+#ifdef DEBUG
+		if (tr[i].cmdTrans == 10)
+			DPRINTF("read byte: %d\n", tr[i].Data.Byte);
+#endif
+	}
+
+	return ret;
+}
+
+int parport_open(int num) {
+	char ppdev[32];
+
+	if (parportfd < 0) {
+		snprintf(ppdev, sizeof(ppdev), "/dev/parport%u", num);
+		DPRINTF("opening %s\n", ppdev);
+		parportfd = open(ppdev, O_RDWR|O_EXCL);
+
+		if (parportfd < 0)
+			fprintf(stderr,"Can't open %s: %s\n", ppdev, strerror(errno));
+	}
+
+	if (parportfd >= 0) {
+		int pmode;
+
+		if (ioctl(parportfd, PPCLAIM) == -1)
+			return -1;
+
+		pmode = IEEE1284_MODE_COMPAT;
+		if (ioctl(parportfd, PPNEGOT, &pmode) == -1)
+			return -1;
+
+#if 0
+		if (cr->Card.dwItems > 1 && cr->Card.Item[1].I.IO.dwAddr) {
+			DPRINTF("ECP mode requested\n");
+			ecpbase = (unsigned long)cr->Card.Item[1].I.IO.dwAddr;
+			/* TODO: Implement ECP mode */
+			pmode = IEEE1284_MODE_ECP;
+
+			if (ioctl(parportfd, PPNEGOT, &pmode) == -1) {
+				ecpbase = 0;
+				pmode = IEEE1284_MODE_COMPAT;
+				if (ioctl(parportfd, PPNEGOT, &pmode) == -1)
+					return ret;
+			}
+		}
+#endif
+	}
+
+	return parportfd;
+}
+
+void parport_close(int handle) {
+	if (parportfd == handle && parportfd >= 0) {
+		ioctl(parportfd, PPRELEASE);
+		close(parportfd);
+		parportfd = -1;
+	}
+}