Messages in this thread Patch in this message | | | From | Dmitry Eremin-Solenikov <> | Subject | [PATCH] tty_io: add an API to get device corresponding to tty_struct | Date | Tue, 2 Jun 2009 19:21:38 +0400 |
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Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> --- drivers/char/tty_io.c | 20 ++++++++++++++++++++ include/linux/tty.h | 1 + 2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 66b99a2..0160500 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -3026,6 +3026,26 @@ dev_t tty_devnum(struct tty_struct *tty) } EXPORT_SYMBOL(tty_devnum); +static int dev_match_devt(struct device *dev, void *data) +{ + dev_t *devt = data; + return dev->devt == *devt; +} + +/** + * tty_get_device - get a device corresponding to tty + * @tty: the struct that describes the tty device + * + * Returns a pointer to the struct device for this tty device + * (or NULL in case of error). + */ +struct device *tty_get_device(struct tty_struct *tty) +{ + dev_t devt = tty_devnum(tty); + return class_find_device(tty_class, NULL, &devt, dev_match_devt); +} +EXPORT_SYMBOL(tty_get_device); + void proc_clear_tty(struct task_struct *p) { unsigned long flags; diff --git a/include/linux/tty.h b/include/linux/tty.h index fc39db9..d17ba1e 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -413,6 +413,7 @@ extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg); extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); extern dev_t tty_devnum(struct tty_struct *tty); +struct device *tty_get_device(struct tty_struct *tty); extern void proc_clear_tty(struct task_struct *p); extern struct tty_struct *get_current_tty(void); extern void tty_default_fops(struct file_operations *fops); -- 1.6.3.1
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