Patchwork [3/7] add lpt_io_ppdev to lpt_io module

diff --git a/lpt_io.c b/lpt_io.c
index e388cd5..b4fe2ab 100644
--- a/lpt_io.c
+++ b/lpt_io.c
@@ -102,10 +102,140 @@  static int lpt_io_direct_init(lpt_io_context_t * p_context, void *data)
 }
 #endif
 
+#ifdef HAVE_PPDEV_IO
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/ppdev.h>
+#include <linux/parport.h>
+
+static struct lpt_io_private_ppdev {
+	int fd;
+} lpt_io_private_ppdev;
+
+static int lpt_io_ppdev_shutdown(void *data)
+{
+	struct lpt_io_driver *driver = data;
+	struct lpt_io_private_ppdev *private = driver->private;
+
+	if (private->fd >= 0) {
+		ioctl(private->fd, PPRELEASE);
+		close(private->fd);
+		private->fd = -1;
+	}
+
+	return 0;
+}
+
+static void lpt_io_ppdev_out_data(lpt_io_context_t context, uint8_t data)
+{
+	struct lpt_io_driver *driver = context;
+	struct lpt_io_private_ppdev *private = driver->private;
+
+	if (private->fd >= 0) {
+		ioctl(private->fd, PPWDATA, &data);
+	}
+}
+
+static void lpt_io_ppdev_out_control(lpt_io_context_t context, uint8_t data)
+{
+	struct lpt_io_driver *driver = context;
+	struct lpt_io_private_ppdev *private = driver->private;
+
+	if (private->fd >= 0) {
+		ioctl(private->fd, PPWCONTROL, &data);
+	}
+}
+
+static uint8_t lpt_io_ppdev_in_data(lpt_io_context_t context)
+{
+	struct lpt_io_driver *driver = context;
+	struct lpt_io_private_ppdev *private = driver->private;
+	uint8_t data = 0;
+
+	if (private->fd >= 0) {
+		ioctl(private->fd, PPRDATA, &data);
+	}
+
+	return data;
+}
+
+static uint8_t lpt_io_ppdev_in_status(lpt_io_context_t context)
+{
+	struct lpt_io_driver *driver = context;
+	struct lpt_io_private_ppdev *private = driver->private;
+	uint8_t data = 0;
+
+	if (private->fd >= 0) {
+		ioctl(private->fd, PPRSTATUS, &data);
+	}
+
+	return data;
+}
+
+static uint8_t lpt_io_ppdev_in_control(lpt_io_context_t context)
+{
+	struct lpt_io_driver *driver = context;
+	struct lpt_io_private_ppdev *private = driver->private;
+	uint8_t data = 0;
+
+	if (private->fd >= 0) {
+		ioctl(private->fd, PPRCONTROL, &data);
+	}
+
+	return data;
+}
+
+static int lpt_io_ppdev_init(lpt_io_context_t * p_context, void *data);
+
+static struct lpt_io_driver lpt_io_driver_ppdev = {
+	.method = "ppdev",
+	.init = lpt_io_ppdev_init,
+	.out_data = lpt_io_ppdev_out_data,
+	.out_control = lpt_io_ppdev_out_control,
+	.in_data = lpt_io_ppdev_in_data,
+	.in_status = lpt_io_ppdev_in_status,
+	.in_control = lpt_io_ppdev_in_control,
+	.shutdown = lpt_io_ppdev_shutdown,
+};
+
+static int lpt_io_ppdev_init(lpt_io_context_t * p_context, void *data)
+{
+	struct lpt_io_driver *driver = &lpt_io_driver_ppdev;
+	struct lpt_io_private_ppdev *private = &lpt_io_private_ppdev;
+	driver->private = (void *)private;
+	char *ppdev_name = (char *)data;
+	private->fd = open(ppdev_name, O_RDWR | O_NONBLOCK);
+
+	if (private->fd < 0) {
+		msg_perr("Error: ppdev=%s not opened (%s)\n", ppdev_name,
+			 strerror(errno));
+		return 1;
+	}
+
+	if (ioctl(private->fd, PPCLAIM) < 0) {
+		msg_perr("Error: ppdev not claimed (%s)\n", strerror(errno));
+		return 1;
+	}
+
+	if (driver->shutdown) {
+		register_shutdown(driver->shutdown, driver);
+	}
+
+	*p_context = (lpt_io_context_t) driver;
+	return 0;
+}
+#endif
+
 static struct lpt_io_driver *lpt_io_drivers[] = {
 #ifdef HAVE_DIRECT_IO
 	&lpt_io_driver_direct,
 #endif
+#ifdef HAVE_PPDEV_IO
+	&lpt_io_driver_ppdev,
+#endif
 	NULL
 };
 
diff --git a/lpt_io.h b/lpt_io.h
index 5777654..2eb9963 100644
--- a/lpt_io.h
+++ b/lpt_io.h
@@ -1,3 +1,4 @@ 
+#define HAVE_PPDEV_IO		//FIXME must be defined in Makefile
 #define HAVE_DIRECT_IO		//FIXME must be defined in Makefile
 #ifndef lpt_io_h_included_
 #define lpt_io_h_included_