Add support for manual getting the modem control lines.
Signed-off-by: Maarten Brock <m.brock@xxxxxxxxxxxxx>
---
drivers/tty/serial/sc16is7xx.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 4df2308..b990a1e 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -809,10 +809,16 @@ 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 DSR and CAR asserted
- */
- return TIOCM_DSR | TIOCM_CAR;
+ unsigned int msr;
+ unsigned int ret = 0;
+
+ msr = sc16is7xx_port_read(port, SC16IS7XX_MSR_REG);
+
+ ret |= (msr & SC16IS7XX_MSR_CTS_BIT) ? TIOCM_CTS : 0;
+ ret |= (msr & SC16IS7XX_MSR_DSR_BIT) ? TIOCM_DSR : 0;
+ ret |= (msr & SC16IS7XX_MSR_RI_BIT) ? TIOCM_RNG : 0;
+ ret |= (msr & SC16IS7XX_MSR_CD_BIT) ? TIOCM_CAR : 0;
+ return ret;
}
static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
--
1.8.3.1
--
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