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excite_procfs.c

/*
 *  Copyright (C) 2004, 2005 by Basler Vision Technologies AG
 *  Author: Thomas Koeller <thomas.koeller@baslerweb.com>
 *
 *  Procfs support for Basler eXcite
 *
 *  This program 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 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <asm/page.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/rm9k-ocd.h>

#include <excite.h>

static int excite_get_unit_id(char *buf, char **addr, off_t offs, int size)
{
      const int len = snprintf(buf, PAGE_SIZE, "%06x", unit_id);
      const int w = len - offs;
      *addr = buf + offs;
      return w < size ? w : size;
}

static int
excite_bootrom_read(char *page, char **start, off_t off, int count,
              int *eof, void *data)
{
      void __iomem * src;

      if (off >= EXCITE_SIZE_BOOTROM) {
            *eof = 1;
            return 0;
      }

      if ((off + count) > EXCITE_SIZE_BOOTROM)
            count = EXCITE_SIZE_BOOTROM - off;

      src = ioremap(EXCITE_PHYS_BOOTROM + off, count);
      if (src) {
            memcpy_fromio(page, src, count);
            iounmap(src);
            *start = page;
      } else {
            count = -ENOMEM;
      }

      return count;
}

void excite_procfs_init(void)
{
      /* Create & populate /proc/excite */
      struct proc_dir_entry * const pdir = proc_mkdir("excite", &proc_root);
      if (pdir) {
            struct proc_dir_entry * e;

            e = create_proc_info_entry("unit_id", S_IRUGO, pdir,
                                 excite_get_unit_id);
            if (e) e->size = 6;

            e = create_proc_read_entry("bootrom", S_IRUGO, pdir,
                                 excite_bootrom_read, NULL);
            if (e) e->size = EXCITE_SIZE_BOOTROM;
      }
}

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