Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 117 insertions, 0 deletions

diff --git a/drivers/mtd/chips/map_absent.c b/drivers/mtd/chips/map_absent.c
new file mode 100644
index 000000000000..c6c83833cc32
--- /dev/null
+++ b/drivers/mtd/chips/map_absent.c
@@ -0,0 +1,117 @@
+/*
+ * Common code to handle absent "placeholder" devices
+ * Copyright 2001 Resilience Corporation <ebrower@resilience.com>
+ * $Id: map_absent.c,v 1.5 2004/11/16 18:29:00 dwmw2 Exp $
+ *
+ * This map driver is used to allocate "placeholder" MTD
+ * devices on systems that have socketed/removable media. 
+ * Use of this driver as a fallback preserves the expected 
+ * registration of MTD device nodes regardless of probe outcome.
+ * A usage example is as follows:
+ *
+ *              my_dev[i] = do_map_probe("cfi", &my_map[i]);
+ *              if(NULL == my_dev[i]) {
+ *                      my_dev[i] = do_map_probe("map_absent", &my_map[i]);
+ *              }
+ *
+ * Any device 'probed' with this driver will return -ENODEV
+ * upon open.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/compatmac.h>
+
+static int map_absent_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
+static int map_absent_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
+static int map_absent_erase (struct mtd_info *, struct erase_info *);
+static void map_absent_sync (struct mtd_info *);
+static struct mtd_info *map_absent_probe(struct map_info *map);
+static void map_absent_destroy (struct mtd_info *);
+
+
+static struct mtd_chip_driver map_absent_chipdrv = {
+        .probe          = map_absent_probe,
+        .destroy        = map_absent_destroy,
+        .name           = "map_absent",
+        .module         = THIS_MODULE
+};
+
+static struct mtd_info *map_absent_probe(struct map_info *map)
+{
+        struct mtd_info *mtd;
+
+        mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
+        if (!mtd) {
+                return NULL;
+        }
+
+        memset(mtd, 0, sizeof(*mtd));
+
+        map->fldrv      = &map_absent_chipdrv;
+        mtd->priv       = map;
+        mtd->name       = map->name;
+        mtd->type       = MTD_ABSENT;
+        mtd->size       = map->size;
+        mtd->erase      = map_absent_erase;
+        mtd->read       = map_absent_read;
+        mtd->write      = map_absent_write;
+        mtd->sync       = map_absent_sync;
+        mtd->flags      = 0;
+        mtd->erasesize = PAGE_SIZE;
+
+        __module_get(THIS_MODULE);
+        return mtd;
+}
+
+
+static int map_absent_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
+{
+        *retlen = 0;
+        return -ENODEV;
+}
+
+static int map_absent_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
+{
+        *retlen = 0;
+        return -ENODEV; 
+}
+
+static int map_absent_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+        return -ENODEV;
+}
+
+static void map_absent_sync(struct mtd_info *mtd)
+{
+        /* nop */
+}
+
+static void map_absent_destroy(struct mtd_info *mtd)
+{
+        /* nop */
+}
+
+static int __init map_absent_init(void)
+{
+        register_mtd_chip_driver(&map_absent_chipdrv);
+        return 0;
+}
+
+static void __exit map_absent_exit(void)
+{
+        unregister_mtd_chip_driver(&map_absent_chipdrv);
+}
+
+module_init(map_absent_init);
+module_exit(map_absent_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Resilience Corporation - Eric Brower <ebrower@resilience.com>");
+MODULE_DESCRIPTION("Placeholder MTD chip driver for 'absent' chips");