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Commit aeee7deb authored by Jag Raman's avatar Jag Raman Committed by David S. Miller
Browse files

sparc64: vcc: Add chars_in_buffer TTY operation 



Add handler to support TTY chars_in_buffer operation

Signed-off-by: default avatarJagannathan Raman <jag.raman@oracle.com>
Reviewed-by: default avatarLiam Merwick <liam.merwick@oracle.com>
Reviewed-by: default avatarShannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cf045260

drivers/tty/vcc.c

+29 −5
Original line number Diff line number Diff line
@@ -937,12 +937,36 @@ static int vcc_write_room(struct tty_struct *tty) 
	return num;

}



static int vcc_chars_in_buffer(struct tty_struct *tty)

{

	struct vcc_port *port;

	u64 num;



	if (unlikely(!tty)) {

		pr_err("VCC: chars_in_buffer: Invalid TTY handle\n");

		return -ENXIO;

	}



	port = vcc_get_ne(tty->index);

	if (unlikely(!port)) {

		pr_err("VCC: chars_in_buffer: Failed to find VCC port\n");

		return -ENODEV;

	}



	num = port->chars_in_buffer;



	vcc_put(port, false);



	return num;

}



static const struct tty_operations vcc_ops = {

	.open			= vcc_open,

	.close			= vcc_close,

	.hangup			= vcc_hangup,

	.write			= vcc_write,

	.write_room		= vcc_write_room,

	.chars_in_buffer	= vcc_chars_in_buffer,

};



#define VCC_TTY_FLAGS   (TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_REAL_RAW)