Messages in this thread Patch in this message | | | Subject | [PATCH 2/2] sc16is7xx: add reading CTS | From | Pascal JEAN <> | Date | Thu, 28 Jul 2016 09:07:36 +0200 |
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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@gmail.com> --- 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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