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Driver Core: misc: add nodename support for misc devices.

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This adds support for misc devices to report their requested nodename to
userspace.  It also updates a number of misc drivers to provide the
needed subdirectory and device name to be used for them.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2009-04-30 15:23:42 +02:00 committed by Greg Kroah-Hartman
parent 6fcf53accc
commit d405640539
6 changed files with 17 additions and 3 deletions
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1
arch/x86/kernel/microcode_core.c
View File

@ -236,6 +236,7 @@ static const struct file_operations microcode_fops = {
static struct miscdevice microcode_dev = {
.minor = MICROCODE_MINOR,
.name = "microcode",
.devnode = "cpu/microcode",
.fops = &microcode_fops,
};

1
drivers/char/hw_random/core.c
View File

@ -153,6 +153,7 @@ static const struct file_operations rng_chrdev_ops = {
static struct miscdevice rng_miscdev = {
.minor = RNG_MISCDEV_MINOR,
.name = RNG_MODULE_NAME,
.devnode = "hwrng",
.fops = &rng_chrdev_ops,
};

15
drivers/char/misc.c
View File

@ -168,7 +168,6 @@ static const struct file_operations misc_fops = {
.open = misc_open,
};
/**
* misc_register - register a miscellaneous device
* @misc: device structure
@ -217,8 +216,8 @@ int misc_register(struct miscdevice * misc)
misc_minors[misc->minor >> 3] |= 1 << (misc->minor & 7);
dev = MKDEV(MISC_MAJOR, misc->minor);
misc->this_device = device_create(misc_class, misc->parent, dev, NULL,
"%s", misc->name);
misc->this_device = device_create(misc_class, misc->parent, dev,
misc, "%s", misc->name);
if (IS_ERR(misc->this_device)) {
err = PTR_ERR(misc->this_device);
goto out;
@ -264,6 +263,15 @@ int misc_deregister(struct miscdevice *misc)
EXPORT_SYMBOL(misc_register);
EXPORT_SYMBOL(misc_deregister);
static char *misc_nodename(struct device *dev)
{
struct miscdevice *c = dev_get_drvdata(dev);
if (c->devnode)
return kstrdup(c->devnode, GFP_KERNEL);
return NULL;
}
static int __init misc_init(void)
{
int err;
@ -279,6 +287,7 @@ static int __init misc_init(void)
err = -EIO;
if (register_chrdev(MISC_MAJOR,"misc",&misc_fops))
goto fail_printk;
misc_class->nodename = misc_nodename;
return 0;
fail_printk:

1
drivers/md/dm-ioctl.c
View File

@ -1513,6 +1513,7 @@ static const struct file_operations _ctl_fops = {
static struct miscdevice _dm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DM_NAME,
.devnode = "mapper/control",
.fops = &_ctl_fops
};

1
drivers/net/tun.c
View File

@ -1366,6 +1366,7 @@ static const struct file_operations tun_fops = {
static struct miscdevice tun_miscdev = {
.minor = TUN_MINOR,
.name = "tun",
.devnode = "net/tun",
.fops = &tun_fops,
};

1
include/linux/miscdevice.h
View File

@ -41,6 +41,7 @@ struct miscdevice {
struct list_head list;
struct device *parent;
struct device *this_device;
const char *devnode;
};
extern int misc_register(struct miscdevice * misc);