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| author |   Okash Khawaja <okash.khawaja@gmail.com> | 2017-06-25 19:40:00 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-27 09:08:47 +0200 |
| commit | fc61ed51270e86440cf7cf84cbe1d86753592932 (patch) | |
| tree | c5df76a420a96193eb49c8218e4be192b7d87358 /include/linux/tty.h | |
| parent | Revert "staging: fsl-mc: drop useless #includes" (diff) | |
| download | wireguard-linux-fc61ed51270e86440cf7cf84cbe1d86753592932.tar.xz wireguard-linux-fc61ed51270e86440cf7cf84cbe1d86753592932.zip | |
tty: add function to convert device name to number
The function converts strings like ttyS0 and ttyUSB0 to dev_t like
(4, 64) and (188, 0). It does this by scanning tty_drivers list for
corresponding device name and index. If the driver is not registered,
this function returns -ENODEV. It also acquires tty_mutex.
Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/tty.h')
| -rw-r--r-- | include/linux/tty.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index b75b2d51ba2b..8156a9ee6fe6 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -402,6 +402,7 @@ extern int __init tty_init(void); extern const char *tty_name(const struct tty_struct *tty); extern struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode, struct file *filp); +extern int tty_dev_name_to_number(const char *name, dev_t *number); #else static inline void tty_kref_put(struct tty_struct *tty) { } @@ -425,6 +426,8 @@ static inline const char *tty_name(const struct tty_struct *tty) static inline struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode, struct file *filp) { return NULL; } +static inline int tty_dev_name_to_number(const char *name, dev_t *number) +{ return -ENOTSUPP; } #endif extern struct ktermios tty_std_termios; |