CRIS: ioctl for getting RS485 information

Add ioctl to CRIS serial driver to get RS485 data from user-space.

Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/arch/cris/include/asm/ioctls.h b/arch/cris/include/asm/ioctls.h
index 35bbc181598a..076c07824eb6 100644
--- a/arch/cris/include/asm/ioctls.h
+++ b/arch/cris/include/asm/ioctls.h
@@ -77,6 +77,7 @@
 #define TIOCSERSETRS485 0x5461  /* enable rs-485 (deprecated) */
 #define TIOCSERWRRS485  0x5462  /* write rs-485 */
 #define TIOCSRS485      0x5463  /* enable rs-485 */
+#define TIOCGRS485      0x542E  /* get rs-485 */
 
 /* Used for packet mode */
 #define TIOCPKT_DATA             0
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 31f172397af3..30626440a062 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -3724,6 +3724,17 @@ rs_ioctl(struct tty_struct *tty, struct file * file,
                 return e100_enable_rs485(tty, &rs485data);
         }
 
+        case TIOCGRS485:
+        {
+                struct serial_rs485 *rs485data =
+                        &(((struct e100_serial *)tty->driver_data)->rs485);
+                /* This is the ioctl to get RS485 data from user-space */
+                if (copy_to_user((struct serial_rs485 *) arg,
+                                        rs485data,
+                                        sizeof(serial_rs485)))
+                        return -EFAULT;
+                break;
+        }
 
         case TIOCSERWRRS485:
         {