redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

USB: serial: ch341: add support for parity, frame length, stop bits

Browse source 
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 in a number of different configurations.

Based on a patch by Grigori Goronzy

Signed-off-by: Aidan Thornton <makosoft@gmail.com>
Reviewed-by: Grigori Goronzy <greg@chown.ath.cx>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Aidan Thornton 2016-10-22 22:02:25 +01:00 committed by Johan Hovold
parent 4e46c410e0
commit ba781bdf86
1 changed files with 26 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
drivers/usb/serial/ch341.c
View file

@ -356,8 +356,33 @@ 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);
@ -376,11 +401,6 @@ 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)