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Commit 2832fc11 authored by Alan Cox's avatar Alan Cox Committed by Greg Kroah-Hartman
Browse files

USB: tty: Add a function to insert a string of characters with the same flag 



The USB drivers often want to insert a series of bytes all with the same
flag set - provide a helper for this case.

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent e4a3d946

drivers/char/tty_buffer.c

+6 −5
Original line number Diff line number Diff line
@@ -231,9 +231,10 @@ int tty_buffer_request_room(struct tty_struct *tty, size_t size) 
EXPORT_SYMBOL_GPL(tty_buffer_request_room);



/**

 *	tty_insert_flip_string	-	Add characters to the tty buffer

 *	tty_insert_flip_string_fixed_flag - Add characters to the tty buffer

 *	@tty: tty structure

 *	@chars: characters

 *	@flag: flag value for each character

 *	@size: size

 *

 *	Queue a series of bytes to the tty buffering. All the characters
@@ -242,8 +243,8 @@ EXPORT_SYMBOL_GPL(tty_buffer_request_room); 
 *	Locking: Called functions may take tty->buf.lock

 */



int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars,

				size_t size)

int tty_insert_flip_string_fixed_flag(struct tty_struct *tty,

		const unsigned char *chars, char flag, size_t size)

{

	int copied = 0;

	do {
@@ -253,7 +254,7 @@ int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, 
		if (unlikely(space == 0))

			break;

		memcpy(tb->char_buf_ptr + tb->used, chars, space);

		memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);

		memset(tb->flag_buf_ptr + tb->used, flag, space);

		tb->used += space;

		copied += space;

		chars += space;
@@ -262,7 +263,7 @@ int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, 
	} while (unlikely(size > copied));

	return copied;

}

EXPORT_SYMBOL(tty_insert_flip_string);

EXPORT_SYMBOL(tty_insert_flip_string_fixed_flag);



/**

 *	tty_insert_flip_string_flags	-	Add characters to the tty buffer

include/linux/tty_flip.h

+6 −1
Original line number Diff line number Diff line
@@ -2,8 +2,8 @@ 
#define _LINUX_TTY_FLIP_H



extern int tty_buffer_request_room(struct tty_struct *tty, size_t size);

extern int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, size_t size);

extern int tty_insert_flip_string_flags(struct tty_struct *tty, const unsigned char *chars, const char *flags, size_t size);

extern int tty_insert_flip_string_fixed_flag(struct tty_struct *tty, const unsigned char *chars, char flag, size_t size);

extern int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars, size_t size);

extern int tty_prepare_flip_string_flags(struct tty_struct *tty, unsigned char **chars, char **flags, size_t size);

void tty_schedule_flip(struct tty_struct *tty);
@@ -20,4 +20,9 @@ static inline int tty_insert_flip_char(struct tty_struct *tty, 
	return tty_insert_flip_string_flags(tty, &ch, &flag, 1);

}



static inline int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, size_t size)

{

	return tty_insert_flip_string_fixed_flag(tty, chars, TTY_NORMAL, size);

}



#endif /* _LINUX_TTY_FLIP_H */