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[MTD] driver model updates
Update driver model support in the MTD framework, so it fits better into the current udev-based hotplug framework: - Each mtd_info now has a device node. MTD drivers should set the dev.parent field to point to the physical device, before setting up partitions or otherwise declaring MTDs. - Those device nodes always map to /sys/class/mtdX device nodes, which no longer depend on MTD_CHARDEV. - Those mtdX sysfs nodes have a "starter set" of attributes; it's not yet sufficient to replace /proc/mtd. - Enabling MTD_CHARDEV provides /sys/class/mtdXro/ nodes and the /sys/class/mtd*/dev attributes (for udev, mdev, etc). - Include a MODULE_ALIAS_CHARDEV_MAJOR macro. It'll work with udev creating the /dev/mtd* nodes, not just a static rootfs. So the sysfs structure is pretty much what you'd expect, except that readonly chardev nodes are a bit quirky. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Brownell
David Woodhouse
parent
9d63287a46
commit
1f24b5a8ec
@ -286,6 +286,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
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gd->private_data = new;
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new->blkcore_priv = gd;
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gd->queue = tr->blkcore_priv->rq;
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gd->driverfs_dev = new->mtd->dev.parent;
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if (new->readonly)
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set_disk_ro(gd, 1);
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@ -20,33 +20,6 @@
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#include <asm/uaccess.h>
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static struct class *mtd_class;
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static void mtd_notify_add(struct mtd_info* mtd)
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{
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if (!mtd)
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return;
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device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
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NULL, "mtd%d", mtd->index);
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device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
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NULL, "mtd%dro", mtd->index);
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}
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static void mtd_notify_remove(struct mtd_info* mtd)
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{
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if (!mtd)
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return;
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device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
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device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
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}
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static struct mtd_notifier notifier = {
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.add = mtd_notify_add,
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.remove = mtd_notify_remove,
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};
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/*
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* Data structure to hold the pointer to the mtd device as well
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@ -854,34 +827,26 @@ static const struct file_operations mtd_fops = {
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static int __init init_mtdchar(void)
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{
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if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
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int status;
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status = register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops);
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if (status < 0) {
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printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
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MTD_CHAR_MAJOR);
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return -EAGAIN;
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}
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mtd_class = class_create(THIS_MODULE, "mtd");
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if (IS_ERR(mtd_class)) {
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printk(KERN_ERR "Error creating mtd class.\n");
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unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
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return PTR_ERR(mtd_class);
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}
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register_mtd_user(¬ifier);
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return 0;
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return status;
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}
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static void __exit cleanup_mtdchar(void)
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{
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unregister_mtd_user(¬ifier);
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class_destroy(mtd_class);
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unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
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}
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module_init(init_mtdchar);
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module_exit(cleanup_mtdchar);
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MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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@ -23,6 +23,9 @@
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#include "mtdcore.h"
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static struct class *mtd_class;
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/* These are exported solely for the purpose of mtd_blkdevs.c. You
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should not use them for _anything_ else */
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DEFINE_MUTEX(mtd_table_mutex);
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@ -33,6 +36,82 @@ EXPORT_SYMBOL_GPL(mtd_table);
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static LIST_HEAD(mtd_notifiers);
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#if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE)
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#define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2)
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#else
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#define MTD_DEVT(index) 0
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#endif
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/* REVISIT once MTD uses the driver model better, whoever allocates
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* the mtd_info will probably want to use the release() hook...
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*/
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static void mtd_release(struct device *dev)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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/* remove /dev/mtdXro node if needed */
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if (MTD_DEVT(mtd->index))
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device_destroy(mtd_class, MTD_DEVT(mtd->index) + 1);
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}
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static ssize_t mtd_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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char *type;
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switch (mtd->type) {
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case MTD_ABSENT:
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type = "absent";
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break;
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case MTD_RAM:
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type = "ram";
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break;
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case MTD_ROM:
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type = "rom";
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break;
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case MTD_NORFLASH:
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type = "nor";
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break;
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case MTD_NANDFLASH:
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type = "nand";
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break;
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case MTD_DATAFLASH:
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type = "dataflash";
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break;
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case MTD_UBIVOLUME:
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type = "ubi";
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break;
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default:
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type = "unknown";
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}
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return snprintf(buf, PAGE_SIZE, "%s\n", type);
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}
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static DEVICE_ATTR(mtd_type, S_IRUGO, mtd_type_show, NULL);
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static struct attribute *mtd_attrs[] = {
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&dev_attr_mtd_type.attr,
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/* FIXME provide a /proc/mtd superset */
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NULL,
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};
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struct attribute_group mtd_group = {
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.attrs = mtd_attrs,
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};
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struct attribute_group *mtd_groups[] = {
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&mtd_group,
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NULL,
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};
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static struct device_type mtd_devtype = {
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.name = "mtd",
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.groups = mtd_groups,
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.release = mtd_release,
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};
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/**
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* add_mtd_device - register an MTD device
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* @mtd: pointer to new MTD device info structure
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@ -41,6 +120,7 @@ static LIST_HEAD(mtd_notifiers);
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* notify each currently active MTD 'user' of its arrival. Returns
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* zero on success or 1 on failure, which currently will only happen
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* if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16)
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* or there's a sysfs error.
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*/
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int add_mtd_device(struct mtd_info *mtd)
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@ -95,6 +175,23 @@ int add_mtd_device(struct mtd_info *mtd)
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mtd->name);
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}
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/* Caller should have set dev.parent to match the
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* physical device.
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*/
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mtd->dev.type = &mtd_devtype;
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mtd->dev.class = mtd_class;
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mtd->dev.devt = MTD_DEVT(i);
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dev_set_name(&mtd->dev, "mtd%d", i);
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if (device_register(&mtd->dev) != 0) {
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mtd_table[i] = NULL;
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break;
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}
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if (MTD_DEVT(i))
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device_create(mtd_class, mtd->dev.parent,
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MTD_DEVT(i) + 1,
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NULL, "mtd%dro", i);
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DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
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/* No need to get a refcount on the module containing
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the notifier, since we hold the mtd_table_mutex */
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@ -358,6 +455,24 @@ EXPORT_SYMBOL_GPL(register_mtd_user);
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EXPORT_SYMBOL_GPL(unregister_mtd_user);
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EXPORT_SYMBOL_GPL(default_mtd_writev);
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static int __init mtd_setup(void)
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{
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mtd_class = class_create(THIS_MODULE, "mtd");
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if (IS_ERR(mtd_class)) {
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pr_err("Error creating mtd class.\n");
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return PTR_ERR(mtd_class);
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}
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return 0;
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}
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core_initcall(mtd_setup);
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static void __exit mtd_teardown(void)
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{
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class_destroy(mtd_class);
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}
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__exitcall(mtd_teardown);
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#ifdef CONFIG_PROC_FS
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/*====================================================================*/
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@ -356,6 +356,11 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
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slave->mtd.owner = master->owner;
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slave->mtd.backing_dev_info = master->backing_dev_info;
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/* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
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* to have the same data be in two different partitions.
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*/
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slave->mtd.dev.parent = master->dev.parent;
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slave->mtd.read = part_read;
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slave->mtd.write = part_write;
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@ -508,7 +513,9 @@ out_register:
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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* the partition definitions.
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* (Q: should we register the master MTD object as well?)
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*
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* We don't register the master, or expect the caller to have done so,
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* for reasons of data integrity.
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*/
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int add_mtd_partitions(struct mtd_info *master,
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@ -11,6 +11,7 @@
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#include <linux/module.h>
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#include <linux/uio.h>
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#include <linux/notifier.h>
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#include <linux/device.h>
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#include <linux/mtd/compatmac.h>
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#include <mtd/mtd-abi.h>
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@ -237,6 +238,7 @@ struct mtd_info {
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void *priv;
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struct module *owner;
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struct device dev;
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int usecount;
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/* If the driver is something smart, like UBI, it may need to maintain
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@ -247,6 +249,11 @@ struct mtd_info {
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void (*put_device) (struct mtd_info *mtd);
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};
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static inline struct mtd_info *dev_to_mtd(struct device *dev)
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{
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return dev ? container_of(dev, struct mtd_info, dev) : NULL;
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}
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static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->erasesize_shift)
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