1 files changed, 50 insertions, 0 deletions
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
new file mode 100644
index 000000000..483d41cbc
--- /dev/null
+++ b/include/linux/tty_flip.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_TTY_FLIP_H
+#define _LINUX_TTY_FLIP_H
+
+#include <linux/tty_buffer.h>
+#include <linux/tty_port.h>
+
+struct tty_ldisc;
+
+int tty_buffer_set_limit(struct tty_port *port, int limit);
+unsigned int tty_buffer_space_avail(struct tty_port *port);
+int tty_buffer_request_room(struct tty_port *port, size_t size);
+int tty_insert_flip_string_flags(struct tty_port *port,
+		const unsigned char *chars, const char *flags, size_t size);
+int tty_insert_flip_string_fixed_flag(struct tty_port *port,
+		const unsigned char *chars, char flag, size_t size);
+int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars,
+		size_t size);
+void tty_flip_buffer_push(struct tty_port *port);
+int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
+
+static inline int tty_insert_flip_char(struct tty_port *port,
+					unsigned char ch, char flag)
+{
+	struct tty_buffer *tb = port->buf.tail;
+	int change;
+
+	change = (tb->flags & TTYB_NORMAL) && (flag != TTY_NORMAL);
+	if (!change && tb->used < tb->size) {
+		if (~tb->flags & TTYB_NORMAL)
+			*flag_buf_ptr(tb, tb->used) = flag;
+		*char_buf_ptr(tb, tb->used++) = ch;
+		return 1;
+	}
+	return __tty_insert_flip_char(port, ch, flag);
+}
+
+static inline int tty_insert_flip_string(struct tty_port *port,
+		const unsigned char *chars, size_t size)
+{
+	return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
+}
+
+int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
+		const char *f, int count);
+
+void tty_buffer_lock_exclusive(struct tty_port *port);
+void tty_buffer_unlock_exclusive(struct tty_port *port);
+
+#endif /* _LINUX_TTY_FLIP_H */