* Core registration and callback routines for MTD
* drivers and users.
*
+ * bdi bits are:
+ * Copyright © 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
-#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
#include <linux/init.h>
#include <linux/mtd/compatmac.h>
#include <linux/proc_fs.h>
+#include <linux/backing-dev.h>
#include <linux/mtd/mtd.h>
-#include "internal.h"
#include "mtdcore.h"
+/*
+ * backing device capabilities for non-mappable devices (such as NAND flash)
+ * - permits private mappings, copies are taken of the data
+ */
+struct backing_dev_info mtd_bdi_unmappable = {
+ .capabilities = BDI_CAP_MAP_COPY,
+};
+/*
+ * backing device capabilities for R/O mappable devices (such as ROM)
+ * - permits private mappings, copies are taken of the data
+ * - permits non-writable shared mappings
+ */
+struct backing_dev_info mtd_bdi_ro_mappable = {
+ .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
+ BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP),
+};
-static struct class *mtd_class;
+/*
+ * backing device capabilities for writable mappable devices (such as RAM)
+ * - permits private mappings, copies are taken of the data
+ * - permits non-writable shared mappings
+ */
+struct backing_dev_info mtd_bdi_rw_mappable = {
+ .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
+ BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP |
+ BDI_CAP_WRITE_MAP),
+};
+
+static int mtd_cls_suspend(struct device *dev, pm_message_t state);
+static int mtd_cls_resume(struct device *dev);
+
+static struct class mtd_class = {
+ .name = "mtd",
+ .owner = THIS_MODULE,
+ .suspend = mtd_cls_suspend,
+ .resume = mtd_cls_resume,
+};
/* These are exported solely for the purpose of mtd_blkdevs.c. You
should not use them for _anything_ else */
*/
static void mtd_release(struct device *dev)
{
- struct mtd_info *mtd = dev_to_mtd(dev);
+ dev_t index = MTD_DEVT(dev_to_mtd(dev)->index);
/* remove /dev/mtdXro node if needed */
- if (MTD_DEVT(mtd->index))
- device_destroy(mtd_class, MTD_DEVT(mtd->index) + 1);
+ if (index)
+ device_destroy(&mtd_class, index + 1);
+}
+
+static int mtd_cls_suspend(struct device *dev, pm_message_t state)
+{
+ struct mtd_info *mtd = dev_to_mtd(dev);
+
+ if (mtd && mtd->suspend)
+ return mtd->suspend(mtd);
+ else
+ return 0;
+}
+
+static int mtd_cls_resume(struct device *dev)
+{
+ struct mtd_info *mtd = dev_to_mtd(dev);
+
+ if (mtd && mtd->resume)
+ mtd->resume(mtd);
+ return 0;
}
static ssize_t mtd_type_show(struct device *dev,
}
static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL);
+static ssize_t mtd_subpagesize_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mtd_info *mtd = dev_to_mtd(dev);
+ unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft;
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize);
+
+}
+static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL);
+
static ssize_t mtd_oobsize_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
&dev_attr_size.attr,
&dev_attr_erasesize.attr,
&dev_attr_writesize.attr,
+ &dev_attr_subpagesize.attr,
&dev_attr_oobsize.attr,
&dev_attr_numeraseregions.attr,
&dev_attr_name.attr,
NULL,
};
-struct attribute_group mtd_group = {
+static struct attribute_group mtd_group = {
.attrs = mtd_attrs,
};
-struct attribute_group *mtd_groups[] = {
+static const struct attribute_group *mtd_groups[] = {
&mtd_group,
NULL,
};
* physical device.
*/
mtd->dev.type = &mtd_devtype;
- mtd->dev.class = mtd_class;
+ mtd->dev.class = &mtd_class;
mtd->dev.devt = MTD_DEVT(i);
dev_set_name(&mtd->dev, "mtd%d", i);
+ dev_set_drvdata(&mtd->dev, mtd);
if (device_register(&mtd->dev) != 0) {
mtd_table[i] = NULL;
break;
}
if (MTD_DEVT(i))
- device_create(mtd_class, mtd->dev.parent,
+ device_create(&mtd_class, mtd->dev.parent,
MTD_DEVT(i) + 1,
NULL, "mtd%dro", i);
for (i=0; i< MAX_MTD_DEVICES; i++)
if (mtd_table[i] == mtd)
ret = mtd_table[i];
- } else if (num < MAX_MTD_DEVICES) {
+ } else if (num >= 0 && num < MAX_MTD_DEVICES) {
ret = mtd_table[num];
if (mtd && mtd != ret)
ret = NULL;
return ((count < begin+len-off) ? count : begin+len-off);
}
+#endif /* CONFIG_PROC_FS */
+
/*====================================================================*/
/* Init code */
+static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name)
+{
+ int ret;
+
+ ret = bdi_init(bdi);
+ if (!ret)
+ ret = bdi_register(bdi, NULL, name);
+
+ if (ret)
+ bdi_destroy(bdi);
+
+ return ret;
+}
+
static int __init init_mtd(void)
{
- mtd_class = class_create(THIS_MODULE, "mtd");
+ int ret;
- if (IS_ERR(mtd_class)) {
- pr_err("Error creating mtd class.\n");
- return PTR_ERR(mtd_class);
- }
+ ret = class_register(&mtd_class);
+ if (ret)
+ goto err_reg;
+
+ ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap");
+ if (ret)
+ goto err_bdi1;
+
+ ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap");
+ if (ret)
+ goto err_bdi2;
+
+ ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap");
+ if (ret)
+ goto err_bdi3;
+
+#ifdef CONFIG_PROC_FS
if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
proc_mtd->read_proc = mtd_read_proc;
+#endif /* CONFIG_PROC_FS */
return 0;
+
+err_bdi3:
+ bdi_destroy(&mtd_bdi_ro_mappable);
+err_bdi2:
+ bdi_destroy(&mtd_bdi_unmappable);
+err_bdi1:
+ class_unregister(&mtd_class);
+err_reg:
+ pr_err("Error registering mtd class or bdi: %d\n", ret);
+ return ret;
}
static void __exit cleanup_mtd(void)
{
+#ifdef CONFIG_PROC_FS
if (proc_mtd)
remove_proc_entry( "mtd", NULL);
- class_destroy(mtd_class);
+#endif /* CONFIG_PROC_FS */
+ class_unregister(&mtd_class);
+ bdi_destroy(&mtd_bdi_unmappable);
+ bdi_destroy(&mtd_bdi_ro_mappable);
+ bdi_destroy(&mtd_bdi_rw_mappable);
}
module_init(init_mtd);
module_exit(cleanup_mtd);
-#endif /* CONFIG_PROC_FS */
-
-
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Core MTD registration and access routines");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff