Messages in this thread Patch in this message | | | From | Grigori Goronzy <> | Subject | [PATCH v2 09/14] USB: ch341: add support for RTS/CTS flow control | Date | Sat, 2 Apr 2016 19:07:18 +0200 |
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v2: use correct flag variable
Signed-off-by: Grigori Goronzy <greg@chown.ath.cx> --- drivers/usb/serial/ch341.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 58309d1..d956f75 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -69,6 +69,7 @@ #define CH341_REQ_READ_REG 0x95 #define CH341_REG_BREAK1 0x05 #define CH341_REG_LCR 0x18 +#define CH341_REG_RTSCTS 0x27 #define CH341_NBREAK_BITS_REG1 0x01 #define CH341_LCR_ENABLE_RX 0x80 @@ -403,6 +404,16 @@ static void ch341_set_termios(struct tty_struct *tty, ch341_set_handshake(port->serial->dev, priv->line_control); + if (cflag & CRTSCTS) { + r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, + CH341_REG_RTSCTS | ((uint16_t)CH341_REG_RTSCTS << 8), + 0x0101); + if (r < 0) { + dev_err(&port->dev, "%s - USB control write error (%d)\n", + __func__, r); + tty->termios.c_cflag &= ~CRTSCTS; + } + } } static void ch341_break_ctl(struct tty_struct *tty, int break_state) -- 1.9.1
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