Hi Greg,
Here are changelog for this patch.
Best Regards
Changelog:
sc16is7xx: add reading CTS
This patch adds the possibility to read the actual
status of the CTS input when RTS/CTS handshaking is
not activated (for general purposes).
Signed-off-by: Pascal JEAN <epsilonrt@xxxxxxxxx>
---
drivers/tty/serial/sc16is7xx.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 3e65079..8833a18 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -818,10 +818,19 @@ static unsigned int sc16is7xx_tx_empty(struct
uart_port *port)
static unsigned int sc16is7xx_get_mctrl(struct uart_port *port)
{
- /* DCD and DSR are not wired and CTS/RTS is handled automatically
- * so just indicate all inputs asserted
- */
- return TIOCM_DSR | TIOCM_CAR | TIOCM_RI | TIOCM_CTS;
+ /* DCD, DSR and RI are not wired so just indicate asserted */
+ unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_RI;
+
+ if (port->status & UPSTAT_CTS_ENABLE)
+ /* CTS handled automatically, indicates that it is always
+ * asserted, this is required for proper management of
+ * the upper layer
+ */
+ mctrl |= TIOCM_CTS;
+ else {
+ /* CTS is not managed automatically, returns its actual state
+ * the upper layer
+ */
+ u8 msr = sc16is7xx_port_read(port, SC16IS7XX_MSR_REG);
+
+ mctrl |= (msr & SC16IS7XX_MSR_CTS_BIT) ? TIOCM_CTS : 0;
+ }
+ return mctrl;
}
static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
--
2.7.4
--
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