path: root/include/linux
diff options
authorOkash Khawaja <okash.khawaja@gmail.com>2017-06-25 19:40:00 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-27 09:08:47 +0200
commitfc61ed51270e86440cf7cf84cbe1d86753592932 (patch)
treec5df76a420a96193eb49c8218e4be192b7d87358 /include/linux
parent97ae021ab818fe29ac78d3acc0ecc6d85fc7cd5b (diff)
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')
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);
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; }
extern struct ktermios tty_std_termios;