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From: Peter Hung <hpeter@gmail.com>
To: johan@kernel.org
Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, tom_tsai@fintek.com.tw,
	peter_hong@fintek.com.tw,
	Peter Hung <hpeter+linux_kernel@gmail.com>
Subject: [PATCH V9 06/10] USB: f81232: implement port enable/disable method
Date: Tue, 17 Mar 2015 17:48:24 +0800	[thread overview]
Message-ID: <1426585708-6382-7-git-send-email-hpeter+linux_kernel@gmail.com> (raw)
In-Reply-To: <1426585708-6382-1-git-send-email-hpeter+linux_kernel@gmail.com>

We put FCR/IER initial step to f81232_port_enable()/f81232_port_disable().
When port is open, it set MSR interrupt on. Otherwise set it off.

Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
---
 drivers/usb/serial/f81232.c | 49 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 28759a0..f0109a4 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -37,6 +37,8 @@ MODULE_DEVICE_TABLE(usb, id_table);
 #define F81232_SET_REGISTER		0x40
 
 #define SERIAL_BASE_ADDRESS			0x0120
+#define INTERRUPT_ENABLE_REGISTER	(0x01 + SERIAL_BASE_ADDRESS)
+#define FIFO_CONTROL_REGISTER		(0x02 + SERIAL_BASE_ADDRESS)
 #define MODEM_CONTROL_REGISTER		(0x04 + SERIAL_BASE_ADDRESS)
 #define MODEM_STATUS_REGISTER		(0x06 + SERIAL_BASE_ADDRESS)
 
@@ -348,6 +350,48 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
 	 */
 }
 
+static int f81232_port_enable(struct usb_serial_port *port)
+{
+	u8 val;
+	int status;
+
+	/* fifo on, trigger8, clear TX/RX*/
+	val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
+			UART_FCR_CLEAR_XMIT;
+
+	status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
+	if (status) {
+		dev_err(&port->dev, "%s failed to set FCR: %d\n",
+			__func__, status);
+		return status;
+	}
+
+	/* MSR Interrupt only, LSR will read from Bulk-in odd byte */
+	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
+			UART_IER_MSI);
+	if (status) {
+		dev_err(&port->dev, "%s failed to set IER: %d\n",
+			__func__, status);
+		return status;
+	}
+
+	return 0;
+}
+
+static int f81232_port_disable(struct usb_serial_port *port)
+{
+	int status;
+
+	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
+	if (status) {
+		dev_err(&port->dev, "%s failed to set IER: %d\n",
+			__func__, status);
+		return status;
+	}
+
+	return 0;
+}
+
 static void f81232_set_termios(struct tty_struct *tty,
 		struct usb_serial_port *port, struct ktermios *old_termios)
 {
@@ -399,6 +443,10 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
 {
 	int result;
 
+	result = f81232_port_enable(port);
+	if (result)
+		return result;
+
 	/* Setup termios */
 	if (tty)
 		f81232_set_termios(tty, port, NULL);
@@ -421,6 +469,7 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
 
 static void f81232_close(struct usb_serial_port *port)
 {
+	f81232_port_disable(port);
 	usb_serial_generic_close(port);
 	usb_kill_urb(port->interrupt_in_urb);
 }
-- 
1.9.1


  parent reply	other threads:[~2015-03-17  9:52 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-17  9:48 [PATCH V9 00/10] usb: serial: F81232 V9 patches Peter Hung
2015-03-17  9:48 ` [PATCH V9 01/10] USB: f81232: rename private struct member name Peter Hung
2015-03-17  9:48 ` [PATCH V9 02/10] USB: f81232: implement RX bulk-in EP Peter Hung
2015-03-27 16:17   ` Johan Hovold
2015-04-01  1:46     ` Peter Hung
2015-03-17  9:48 ` [PATCH V9 03/10] USB: f81232: change lock mechanism Peter Hung
2015-03-17  9:48 ` [PATCH V9 04/10] USB: f81232: implement read IIR/MSR with endpoint Peter Hung
2015-03-17  9:48 ` [PATCH V9 05/10] USB: f81232: implement MCR/MSR function Peter Hung
2015-03-17  9:48 ` Peter Hung [this message]
2015-03-17  9:48 ` [PATCH V9 07/10] USB: f81232: implement set_termios() Peter Hung
2015-03-17  9:48 ` [PATCH V9 08/10] USB: f81232: clarify f81232_ioctl() and fix Peter Hung
2015-03-17  9:48 ` [PATCH V9 09/10] USB: f81232: cleanup non-used define Peter Hung
2015-03-17  9:48 ` [PATCH V9 10/10] USB: f81232: modify/add author Peter Hung

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