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[PATCH] TTY: return class device pointer from tty_register_device()

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Let tty_register_device() return a pointer to the class device it creates.
This allows registrants to add their own sysfs files under the class
device node.

Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Hansjoerg Lipp 2006-04-22 18:36:53 +02:00 committed by Greg Kroah-Hartman
parent 53877d06d5
commit 1cdcb6b43f
2 changed files with 10 additions and 5 deletions
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11
drivers/char/tty_io.c
View file

@ -2961,12 +2961,14 @@ static struct class *tty_class;
* This field is optional, if there is no known struct device for this
* tty device it can be set to NULL safely.
*
* Returns a pointer to the class device (or ERR_PTR(-EFOO) on error).
*
* This call is required to be made to register an individual tty device if
* the tty driver's flags have the TTY_DRIVER_NO_DEVFS bit set. If that
* bit is not set, this function should not be called.
*/
void tty_register_device(struct tty_driver *driver, unsigned index,
struct device *device)
struct class_device *tty_register_device(struct tty_driver *driver,
unsigned index, struct device *device)
{
char name[64];
dev_t dev = MKDEV(driver->major, driver->minor_start) + index;
@ -2974,7 +2976,7 @@ void tty_register_device(struct tty_driver *driver, unsigned index,
if (index >= driver->num) {
printk(KERN_ERR "Attempt to register invalid tty line number "
" (%d).\n", index);
return;
return ERR_PTR(-EINVAL);
}
devfs_mk_cdev(dev, S_IFCHR | S_IRUSR | S_IWUSR,
@ -2984,7 +2986,8 @@ void tty_register_device(struct tty_driver *driver, unsigned index,
pty_line_name(driver, index, name);
else
tty_line_name(driver, index, name);
class_device_create(tty_class, NULL, dev, device, "%s", name);
return class_device_create(tty_class, NULL, dev, device, "%s", name);
}
/**

4
include/linux/tty.h
View file

@ -290,7 +290,9 @@ extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
extern int tty_unregister_ldisc(int disc);
extern int tty_register_driver(struct tty_driver *driver);
extern int tty_unregister_driver(struct tty_driver *driver);
extern void tty_register_device(struct tty_driver *driver, unsigned index, struct device *dev);
extern struct class_device *tty_register_device(struct tty_driver *driver,
unsigned index,
struct device *dev);
extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
int buflen);