From: Grigori Goronzy <greg@chown.ath.cx>
To: Johan Hovold <johan@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Grigori Goronzy <greg@chown.ath.cx>
Subject: [PATCH v3 08/13] USB: ch341: add support for RTS/CTS flow control
Date: Mon, 11 Apr 2016 01:43:48 +0200 [thread overview]
Message-ID: <1460331833-19836-9-git-send-email-greg@chown.ath.cx> (raw)
In-Reply-To: <1460331833-19836-1-git-send-email-greg@chown.ath.cx>
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 94e6016..135370b 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -68,6 +68,7 @@
#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
@@ -399,6 +400,16 @@ 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
next prev parent reply other threads:[~2016-04-10 23:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-10 23:43 Major improvements to the ch341 driver v3 Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 01/13] USB: ch341: fix error handling on resume Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 02/13] USB: ch341: add LCR register definitions Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 03/13] USB: ch341: add definitions for modem control Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 04/13] USB: ch341: fix USB buffer allocations Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 05/13] USB: ch341: reinitialize chip on reconfiguration Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 06/13] USB: ch341: add support for parity, frame length, stop bits Grigori Goronzy
2016-04-11 17:25 ` Karl Palsson
2016-04-11 18:25 ` Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 07/13] USB: ch341: add debug output for chip version Grigori Goronzy
2016-04-10 23:43 ` Grigori Goronzy [this message]
2016-04-11 1:27 ` [PATCH v3 08/13] USB: ch341: add support for RTS/CTS flow control kbuild test robot
2016-04-10 23:43 ` [PATCH v3 09/13] USB: ch341: fix coding style Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 10/13] USB: ch341: clean up messages Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 11/13] USB: ch341: improve B0 handling Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 12/13] USB: ch341: get rid of default configuration Grigori Goronzy
2016-04-10 23:43 ` [PATCH v3 13/13] USB: ch341: implement tx_empty callback Grigori Goronzy
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