[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:
committed by
David Woodhouse
parent
9d63287a46
commit
1f24b5a8ec
@ -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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