utils/lcd4linux/patches/170-add-generic-spidev-driver.patch

   1 --- a/Makefile.am
   2 +++ b/Makefile.am
   3 @@ -71,6 +71,8 @@ drv_generic_i2c.c             \
   4  drv_generic_i2c.h             \
   5  drv_generic_keypad.c          \
   6  drv_generic_keypad.h          \
   7 +drv_generic_spidev.c          \
   8 +drv_generic_spidev.h          \
   9  drv_ASTUSB.c                  \
  10  drv_BeckmannEgle.c            \
  11  drv_BWCT.c                    \
  12 --- /dev/null
  13 +++ b/drv_generic_spidev.c
  14 @@ -0,0 +1,89 @@
  15 +/* $Id$
  16 + * $URL$
  17 + *
  18 + * generic driver helper for displays connected via SPI bus
  19 + *
  20 + * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
  21 + *
  22 + * This file is part of LCD4Linux.
  23 + *
  24 + * LCD4Linux is free software; you can redistribute it and/or modify
  25 + * it under the terms of the GNU General Public License as published by
  26 + * the Free Software Foundation; either version 2, or (at your option)
  27 + * any later version.
  28 + *
  29 + * LCD4Linux is distributed in the hope that it will be useful,
  30 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32 + * GNU General Public License for more details.
  33 + *
  34 + * You should have received a copy of the GNU General Public License
  35 + * along with this program; if not, write to the Free Software
  36 + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  37 + *
  38 + */
  39 +
  40 +#include "config.h"
  41 +
  42 +#include <stdlib.h>
  43 +#include <stdio.h>
  44 +#include <string.h>
  45 +#include <errno.h>
  46 +#include <unistd.h>
  47 +#include <fcntl.h>
  48 +#include <sys/types.h>
  49 +#include <sys/ioctl.h>
  50 +
  51 +#include "debug.h"
  52 +#include "qprintf.h"
  53 +#include "cfg.h"
  54 +#include "drv_generic_spidev.h"
  55 +
  56 +static char *generic_spidev_section = "";
  57 +static char *generic_spidev_driver = "";
  58 +static int generic_spidev_fd;
  59 +
  60 +int drv_generic_spidev_open(const char *section, const char *driver)
  61 +{
  62 +    char *spidev;
  63 +
  64 +    udelay_init();
  65 +
  66 +    generic_spidev_section = (char *) section;
  67 +    generic_spidev_driver = (char *) driver;
  68 +
  69 +    spidev = cfg_get(generic_spidev_section, "Port", NULL);
  70 +
  71 +    info("%s: initializing SPI device %s", generic_spidev_driver, spidev);
  72 +    generic_spidev_fd = open(spidev, O_WRONLY);
  73 +    if (generic_spidev_fd < 0) {
  74 +       error("%s: unable to open SPI device %s!\n", generic_spidev_driver, spidev);
  75 +       goto exit_error;
  76 +    }
  77 +
  78 +    return 0;
  79 +
  80 +  exit_error:
  81 +    free(spidev);
  82 +    return -1;
  83 +}
  84 +
  85 +int drv_generic_spidev_close(void)
  86 +{
  87 +    close(generic_spidev_fd);
  88 +    return 0;
  89 +}
  90 +
  91 +int drv_generic_spidev_transfer(const int count, struct spi_ioc_transfer *tr)
  92 +{
  93 +    int ret;
  94 +
  95 +    ret = ioctl(generic_spidev_fd, SPI_IOC_MESSAGE(count), tr);
  96 +    if (ret < count) {
  97 +       error("%s: can't send SPI message! (%s)\n",
  98 +               generic_spidev_driver, strerror(errno));
  99 +       return -1;
 100 +    }
 101 +
 102 +    return 0;
 103 +}
 104 --- /dev/null
 105 +++ b/drv_generic_spidev.h
 106 @@ -0,0 +1,54 @@
 107 +/* $Id$
 108 + * $URL$
 109 + *
 110 + * generic driver helper for displays connected via SPI bus
 111 + *
 112 + * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
 113 + * Copyright (C) 2012 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 114 + *
 115 + * This file is part of LCD4Linux.
 116 + *
 117 + * LCD4Linux is free software; you can redistribute it and/or modify
 118 + * it under the terms of the GNU General Public License as published by
 119 + * the Free Software Foundation; either version 2, or (at your option)
 120 + * any later version.
 121 + *
 122 + * LCD4Linux is distributed in the hope that it will be useful,
 123 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 124 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 125 + * GNU General Public License for more details.
 126 + *
 127 + * You should have received a copy of the GNU General Public License
 128 + * along with this program; if not, write to the Free Software
 129 + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 130 + *
 131 + */
 132 +
 133 +/*
 134 + *
 135 + * exported fuctions:
 136 + *
 137 + * int drv_generic_spidev_open (const char *section, const char *driver)
 138 + *   reads 'Port' entry from config and opens
 139 + *   the SPI device
 140 + *   returns 0 if ok, -1 on failure
 141 + *
 142 + * int drv_generic_spidev_close (void)
 143 + *   closes SPI device
 144 + *   returns 0 if ok, -1 on failure
 145 + *
 146 + * void drv_generic_spidev_transfer (int count, struct spi_ioc_transfer *tr)
 147 + *   transfer data to/from the SPI device
 148 + *
 149 + */
 150 +
 151 +#ifndef _DRV_GENERIC_SPIDEV_H_
 152 +#define _DRV_GENERIC_SPIDEV_H_
 153 +
 154 +#include <linux/spi/spidev.h>
 155 +
 156 +int drv_generic_spidev_open(const char *section, const char *driver);
 157 +int drv_generic_spidev_close(void);
 158 +int drv_generic_spidev_transfer(const int count, struct spi_ioc_transfer *tr);
 159 +
 160 +#endif /* _DRV_GENERIC_SPIDEV_H_ */
 161 --- a/drivers.m4
 162 +++ b/drivers.m4
 163 @@ -301,6 +301,7 @@ PARPORT="no"
 164  SERIAL="no"
 165  I2C="no"
 166  KEYPAD="no"
 167 +SPIDEV="no"
 168
 169  # generic libraries
 170  LIBUSB="no"
 171 @@ -940,6 +941,12 @@ if test "$LIBJPEG" = "yes"; then
 172     DRVLIBS="$DRVLIBS -ljpeg"
 173  fi
 174
 175 +# generic spidev driver
 176 +if test "$SPIDEV" = "yes"; then
 177 +   DRIVERS="$DRIVERS drv_generic_spidev.o"
 178 +   AC_DEFINE(WITH_SPIDEV, 1, [SPIDEV driver])
 179 +fi
 180 +
 181  # libusb
 182  if test "$LIBUSB" = "yes"; then
 183     DRVLIBS="$DRVLIBS -lusb"
 184 --- a/configure.in
 185 +++ b/configure.in
 186 @@ -118,6 +118,9 @@ AC_ARG_WITH(outb,
 187
 188  AC_CHECK_HEADERS([asm/io.h] [linux/parport.h linux/ppdev.h], [has_parport="true"], [has_parport="false"])
 189
 190 +# check for spidev
 191 +AC_CHECK_HEADERS([linux/spi/spidev.h], [has_spidev="true"], [has_spidev="false"])
 192 +
 193  # drivers
 194  sinclude(drivers.m4)
 195