With the new reinitialization method, configuring parity, different
frame lengths and different stop bit settings should work as expected
on both CH340G and CH341A. Tested on a loopback-connected CH340G
with a logic analyzer, and the only differences from Grigori's
CH341A-tested code should be names of defines and patch organization.
Based on a patch by Grigori Goronzy
Signed-off-by: Aidan Thornton <makosoft@xxxxxxxxx>
---
drivers/usb/serial/ch341.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index ce799d0..d5f83ff 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -355,8 +355,33 @@ static void ch341_set_termios(struct tty_struct *tty,
baud_rate = tty_get_baud_rate(tty);
priv->baud_rate = baud_rate;
+ ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX;
- ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
+ switch (C_CSIZE(tty)) {
+ case CS5:
+ ctrl |= CH341_LCR_CS5;
+ break;
+ case CS6:
+ ctrl |= CH341_LCR_CS6;
+ break;
+ case CS7:
+ ctrl |= CH341_LCR_CS7;
+ break;
+ case CS8:
+ ctrl |= CH341_LCR_CS8;
+ break;
+ }
+
+ if (C_PARENB(tty)) {
+ ctrl |= CH341_LCR_ENABLE_PAR;
+ if (C_PARODD(tty) == 0)
+ ctrl |= CH341_LCR_PAR_EVEN;
+ if (C_CMSPAR(tty))
+ ctrl |= CH341_LCR_MARK_SPACE;
+ }
+
+ if (C_CSTOPB(tty))
+ ctrl |= CH341_LCR_STOP_BITS_2;
if (baud_rate) {
spin_lock_irqsave(&priv->lock, flags);
@@ -375,11 +400,6 @@ static void ch341_set_termios(struct tty_struct *tty,
ch341_set_handshake(port->serial->dev, priv->line_control);
- /* Unimplemented:
- * (cflag & CSIZE) : data bits [5, 8]
- * (cflag & PARENB) : parity {NONE, EVEN, ODD}
- * (cflag & CSTOPB) : stop bits [1, 2]
- */
}
static void ch341_break_ctl(struct tty_struct *tty, int break_state)
--
2.10.0
--
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