From: "Ji-Ze Hong (Peter Hong)" <hpeter@gmail.com>
To: peter_hong@fintek.com.tw, johan@kernel.org, gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
"Ji-Ze Hong (Peter Hong)" <hpeter+linux_kernel@gmail.com>
Subject: [PATCH V5 3/3] USB: serial: f81232: implement break control
Date: Wed, 3 Apr 2019 14:26:30 +0800 [thread overview]
Message-ID: <1554272790-26747-3-git-send-email-hpeter+linux_kernel@gmail.com> (raw)
In-Reply-To: <1554272790-26747-1-git-send-email-hpeter+linux_kernel@gmail.com>
Implement Fintek F81232 break on/off with LCR register.
It's the same with 16550A LCR register layout.
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
---
v5:
1: no change
v4:
1: no change
v3:
1: using shadow_lcr to save LCR in f81232_break_ctl()
drivers/usb/serial/f81232.c | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 32eff8fad56a..fe28657b4064 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -65,6 +65,7 @@ struct f81232_private {
struct mutex lock;
u8 modem_control;
u8 modem_status;
+ u8 shadow_lcr;
speed_t baud_base;
struct work_struct lsr_work;
struct work_struct interrupt_work;
@@ -380,13 +381,23 @@ static void f81232_process_read_urb(struct urb *urb)
static void f81232_break_ctl(struct tty_struct *tty, int break_state)
{
- /* FIXME - Stubbed out for now */
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *priv = usb_get_serial_port_data(port);
+ int status;
- /*
- * break_state = -1 to turn on break, and 0 to turn off break
- * see drivers/char/tty_io.c to see it used.
- * last_set_data_urb_value NEVER has the break bit set in it.
- */
+ mutex_lock(&priv->lock);
+
+ if (break_state)
+ priv->shadow_lcr |= UART_LCR_SBC;
+ else
+ priv->shadow_lcr &= ~UART_LCR_SBC;
+
+ status = f81232_set_register(port, LINE_CONTROL_REGISTER,
+ priv->shadow_lcr);
+ if (status)
+ dev_err(&port->dev, "set break failed: %d\n", status);
+
+ mutex_unlock(&priv->lock);
}
static int f81232_find_clk(speed_t baudrate)
@@ -522,6 +533,7 @@ static int f81232_port_disable(struct usb_serial_port *port)
static void f81232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
+ struct f81232_private *priv = usb_get_serial_port_data(port);
u8 new_lcr = 0;
int status = 0;
speed_t baudrate;
@@ -575,11 +587,16 @@ static void f81232_set_termios(struct tty_struct *tty,
break;
}
+ mutex_lock(&priv->lock);
+
+ new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
if (status) {
dev_err(&port->dev, "%s failed to set LCR: %d\n",
__func__, status);
}
+
+ mutex_unlock(&priv->lock);
}
static int f81232_tiocmget(struct tty_struct *tty)
--
2.7.4
next prev parent reply other threads:[~2019-04-03 6:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 6:26 [PATCH V5 1/3] USB: serial: f81232: clear overrun flag Ji-Ze Hong (Peter Hong)
2019-04-03 6:26 ` [PATCH V5 2/3] USB: serial: f81232: add high baud rate support Ji-Ze Hong (Peter Hong)
2019-04-03 6:26 ` Ji-Ze Hong (Peter Hong) [this message]
2019-04-03 7:59 ` [PATCH V5 1/3] USB: serial: f81232: clear overrun flag Oliver Neukum
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1554272790-26747-3-git-send-email-hpeter+linux_kernel@gmail.com \
--to=hpeter@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=hpeter+linux_kernel@gmail.com \
--cc=johan@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=peter_hong@fintek.com.tw \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).