openmptcprouter-feeds/lcd4linux/patches/170-add-generic-spidev-driver.patch

--- a/Makefile.am
+++ b/Makefile.am
@@ -71,6 +71,8 @@ drv_generic_i2c.c             \
 drv_generic_i2c.h             \
 drv_generic_keypad.c          \
 drv_generic_keypad.h          \
+drv_generic_spidev.c          \
+drv_generic_spidev.h          \
 drv_ASTUSB.c                  \
 drv_BeckmannEgle.c            \
 drv_BWCT.c                    \
--- /dev/null
+++ b/drv_generic_spidev.c
@@ -0,0 +1,89 @@
+/* $Id$
+ * $URL$
+ *
+ * generic driver helper for displays connected via SPI bus
+ *
+ * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+#include "debug.h"
+#include "qprintf.h"
+#include "cfg.h"
+#include "drv_generic_spidev.h"
+
+static char *generic_spidev_section = "";
+static char *generic_spidev_driver = "";
+static int generic_spidev_fd;
+
+int drv_generic_spidev_open(const char *section, const char *driver)
+{
+    char *spidev;
+
+    udelay_init();
+
+    generic_spidev_section = (char *) section;
+    generic_spidev_driver = (char *) driver;
+
+    spidev = cfg_get(generic_spidev_section, "Port", NULL);
+
+    info("%s: initializing SPI device %s", generic_spidev_driver, spidev);
+    generic_spidev_fd = open(spidev, O_WRONLY);
+    if (generic_spidev_fd < 0) {
+	error("%s: unable to open SPI device %s!\n", generic_spidev_driver, spidev);
+	goto exit_error;
+    }
+
+    return 0;
+
+  exit_error:
+    free(spidev);
+    return -1;
+}
+
+int drv_generic_spidev_close(void)
+{
+    close(generic_spidev_fd);
+    return 0;
+}
+
+int drv_generic_spidev_transfer(const int count, struct spi_ioc_transfer *tr)
+{
+    int ret;
+
+    ret = ioctl(generic_spidev_fd, SPI_IOC_MESSAGE(count), tr);
+    if (ret < count) {
+	error("%s: can't send SPI message! (%s)\n",
+		generic_spidev_driver, strerror(errno));
+	return -1;
+    }
+
+    return 0;
+}
--- /dev/null
+++ b/drv_generic_spidev.h
@@ -0,0 +1,54 @@
+/* $Id$
+ * $URL$
+ *
+ * generic driver helper for displays connected via SPI bus
+ *
+ * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2012 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+ *
+ * exported fuctions:
+ *
+ * int drv_generic_spidev_open (const char *section, const char *driver)
+ *   reads 'Port' entry from config and opens
+ *   the SPI device
+ *   returns 0 if ok, -1 on failure
+ *
+ * int drv_generic_spidev_close (void)
+ *   closes SPI device
+ *   returns 0 if ok, -1 on failure
+ *
+ * void drv_generic_spidev_transfer (int count, struct spi_ioc_transfer *tr)
+ *   transfer data to/from the SPI device
+ *
+ */
+
+#ifndef _DRV_GENERIC_SPIDEV_H_
+#define _DRV_GENERIC_SPIDEV_H_
+
+#include <linux/spi/spidev.h>
+
+int drv_generic_spidev_open(const char *section, const char *driver);
+int drv_generic_spidev_close(void);
+int drv_generic_spidev_transfer(const int count, struct spi_ioc_transfer *tr);
+
+#endif /* _DRV_GENERIC_SPIDEV_H_ */
--- a/drivers.m4
+++ b/drivers.m4
@@ -301,6 +301,7 @@ PARPORT="no"
 SERIAL="no"
 I2C="no"
 KEYPAD="no"
+SPIDEV="no"
 
 # generic libraries
 LIBUSB="no"
@@ -936,6 +937,12 @@ if test "$LIBJPEG" = "yes"; then
    DRVLIBS="$DRVLIBS -ljpeg"
 fi
 
+# generic spidev driver
+if test "$SPIDEV" = "yes"; then
+   DRIVERS="$DRIVERS drv_generic_spidev.o"
+   AC_DEFINE(WITH_SPIDEV, 1, [SPIDEV driver])
+fi
+
 # libusb
 if test "$LIBUSB" = "yes"; then
    DRVLIBS="$DRVLIBS -lusb"
--- a/configure.ac
+++ b/configure.ac
@@ -115,6 +115,9 @@ AC_ARG_WITH(outb,
 
 AC_CHECK_HEADERS([asm/io.h] [linux/parport.h linux/ppdev.h], [has_parport="true"], [has_parport="false"])
 
+# check for spidev
+AC_CHECK_HEADERS([linux/spi/spidev.h], [has_spidev="true"], [has_spidev="false"])
+
 # drivers
 sinclude(drivers.m4)