linux-kernel - [PATCH 12/12] ipack/devices/ipoctal: added shutdown callback

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Date:	Mon, 10 Dec 2012 11:50:08 +0100
From:	Samuel Iglesias Gonsalvez <siglesias@...lia.com>
To:	Jens Taprogge <jens.taprogge@...rogge.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	industrypack-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	Samuel Iglesias Gonsalvez <siglesias@...lia.com>
Subject: [PATCH 12/12] ipack/devices/ipoctal: added shutdown callback

Added shutdown callback to disable RX and TX when there is no other client
accesing the device.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@...lia.com>
---
 drivers/ipack/devices/ipoctal.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
index 3561fb52..e2ae10b 100644
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -624,6 +624,22 @@ static void ipoctal_hangup(struct tty_struct *tty)
 	wake_up_interruptible(&channel->tty_port.open_wait);
 }
 
+static void ipoctal_shutdown(struct tty_struct *tty)
+{
+	struct ipoctal_channel *channel = tty->driver_data;
+
+	if (channel == NULL)
+		return;
+
+	iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+	channel->rx_enable = 0;
+	iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
+	iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
+	iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
+	iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
+	clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
+}
+
 static const struct tty_operations ipoctal_fops = {
 	.ioctl =		NULL,
 	.open =			ipoctal_open,
@@ -634,6 +650,7 @@ static const struct tty_operations ipoctal_fops = {
 	.chars_in_buffer =	ipoctal_chars_in_buffer,
 	.get_icount =		ipoctal_get_icount,
 	.hangup =		ipoctal_hangup,
+	.shutdown =		ipoctal_shutdown,
 };
 
 static int ipoctal_probe(struct ipack_device *dev)
-- 
1.7.10.4

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