1 files changed, 19 insertions, 3 deletions

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 057038cf2788..baf3e1d08416 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -123,6 +123,7 @@ struct uart_port {
         void                    (*set_termios)(struct uart_port *,
                                                struct ktermios *new,
                                                struct ktermios *old);
+        void                    (*set_mctrl)(struct uart_port *, unsigned int);
         int                     (*startup)(struct uart_port *port);
         void                    (*shutdown)(struct uart_port *port);
         void                    (*throttle)(struct uart_port *port);
@@ -190,8 +191,10 @@ struct uart_port {
 #define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )
 
-/* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
-#define UPF_HARD_FLOW           ((__force upf_t) (1 << 21))
+/* Port has hardware-assisted h/w flow control */
+#define UPF_AUTO_CTS            ((__force upf_t) (1 << 20))
+#define UPF_AUTO_RTS            ((__force upf_t) (1 << 21))
+#define UPF_HARD_FLOW           ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
 /* Port has hardware-assisted s/w flow control */
 #define UPF_SOFT_FLOW           ((__force upf_t) (1 << 22))
 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
@@ -213,11 +216,17 @@ struct uart_port {
 #error Change mask not equivalent to userspace-visible bit defines
 #endif
 
-        /* status must be updated while holding port lock */
+        /*
+         * Must hold termios_rwsem, port mutex and port lock to change;
+         * can hold any one lock to read.
+         */
         upstat_t                status;
 
 #define UPSTAT_CTS_ENABLE       ((__force upstat_t) (1 << 0))
 #define UPSTAT_DCD_ENABLE       ((__force upstat_t) (1 << 1))
+#define UPSTAT_AUTORTS          ((__force upstat_t) (1 << 2))
+#define UPSTAT_AUTOCTS          ((__force upstat_t) (1 << 3))
+#define UPSTAT_AUTOXOFF         ((__force upstat_t) (1 << 4))
 
         int                     hw_stopped;             /* sw-assisted CTS flow state */
         unsigned int            mctrl;                  /* current modem ctrl settings */
@@ -391,6 +400,13 @@ static inline bool uart_cts_enabled(struct uart_port *uport)
         return !!(uport->status & UPSTAT_CTS_ENABLE);
 }
 
+static inline bool uart_softcts_mode(struct uart_port *uport)
+{
+        upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS;
+
+        return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
+}
+
 /*
  * The following are helper functions for the low level drivers.
  */