1 files changed, 92 insertions, 0 deletions
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
new file mode 100644
index 000000000..af4fce98f
--- /dev/null
+++ b/include/linux/tty_flip.h
@@ -0,0 +1,92 @@
+/* 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);
+size_t __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars,
+				      const u8 *flags, bool mutable_flags,
+				      size_t size);
+size_t tty_prepare_flip_string(struct tty_port *port, u8 **chars, size_t size);
+void tty_flip_buffer_push(struct tty_port *port);
+
+/**
+ * tty_insert_flip_string_fixed_flag - add characters to the tty buffer
+ * @port: tty port
+ * @chars: characters
+ * @flag: flag value for each character
+ * @size: size
+ *
+ * Queue a series of bytes to the tty buffering. All the characters passed are
+ * marked with the supplied flag.
+ *
+ * Returns: the number added.
+ */
+static inline size_t tty_insert_flip_string_fixed_flag(struct tty_port *port,
+						       const u8 *chars, u8 flag,
+						       size_t size)
+{
+	return __tty_insert_flip_string_flags(port, chars, &flag, false, size);
+}
+
+/**
+ * tty_insert_flip_string_flags - add characters to the tty buffer
+ * @port: tty port
+ * @chars: characters
+ * @flags: flag bytes
+ * @size: size
+ *
+ * Queue a series of bytes to the tty buffering. For each character the flags
+ * array indicates the status of the character.
+ *
+ * Returns: the number added.
+ */
+static inline size_t tty_insert_flip_string_flags(struct tty_port *port,
+						  const u8 *chars,
+						  const u8 *flags, size_t size)
+{
+	return __tty_insert_flip_string_flags(port, chars, flags, true, size);
+}
+
+/**
+ * tty_insert_flip_char - add one character to the tty buffer
+ * @port: tty port
+ * @ch: character
+ * @flag: flag byte
+ *
+ * Queue a single byte @ch to the tty buffering, with an optional flag.
+ */
+static inline size_t tty_insert_flip_char(struct tty_port *port, u8 ch, u8 flag)
+{
+	struct tty_buffer *tb = port->buf.tail;
+	int change;
+
+	change = !tb->flags && (flag != TTY_NORMAL);
+	if (!change && tb->used < tb->size) {
+		if (tb->flags)
+			*flag_buf_ptr(tb, tb->used) = flag;
+		*char_buf_ptr(tb, tb->used++) = ch;
+		return 1;
+	}
+	return __tty_insert_flip_string_flags(port, &ch, &flag, false, 1);
+}
+
+static inline size_t tty_insert_flip_string(struct tty_port *port,
+					    const u8 *chars, size_t size)
+{
+	return tty_insert_flip_string_fixed_flag(port, chars, TTY_NORMAL, size);
+}
+
+size_t tty_ldisc_receive_buf(struct tty_ldisc *ld, const u8 *p, const u8 *f,
+			     size_t count);
+
+void tty_buffer_lock_exclusive(struct tty_port *port);
+void tty_buffer_unlock_exclusive(struct tty_port *port);
+
+#endif /* _LINUX_TTY_FLIP_H */