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@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
index 8666d2d05eef..0b3c4b8fe830 100644
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -625,6 +625,22 @@ 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,
@@ -635,6 +651,7 @@ 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)