Blackfin Serial Driver: Enable IR function when user application (irattach /dev/ttyBFx -s) call TIOCSETD ioctl with line discipline N_IRDA

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 46bb47f37b9a..4e0b8cd4d4e0 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -900,6 +900,31 @@ bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
         return 0;
 }
 
+/*
+ * Enable the IrDA function if tty->ldisc.num is N_IRDA.
+ * In other cases, disable IrDA function.
+ */
+static void bfin_set_ldisc(struct tty_struct *tty)
+{
+        int line = tty->index;
+        unsigned short val;
+
+        if (line >= tty->driver->num)
+                return;
+
+        switch (tty->ldisc.num) {
+        case N_IRDA:
+                val = UART_GET_GCTL(&bfin_serial_ports[line]);
+                val |= (IREN | RPOLC);
+                UART_PUT_GCTL(&bfin_serial_ports[line], val);
+                break;
+        default:
+                val = UART_GET_GCTL(&bfin_serial_ports[line]);
+                val &= ~(IREN | RPOLC);
+                UART_PUT_GCTL(&bfin_serial_ports[line], val);
+        }
+}
+
 static struct uart_ops bfin_serial_pops = {
         .tx_empty       = bfin_serial_tx_empty,
         .set_mctrl      = bfin_serial_set_mctrl,
@@ -1261,6 +1286,7 @@ static int __init bfin_serial_init(void)
 
         ret = uart_register_driver(&bfin_serial_reg);
         if (ret == 0) {
+                bfin_serial_reg.tty_driver->set_ldisc = bfin_set_ldisc;
                 ret = platform_driver_register(&bfin_serial_driver);
                 if (ret) {
                         pr_debug("uart register failed\n");