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authorMing Lei <tom.leiming@gmail.com>2009-02-20 21:23:09 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:20:36 -0700
commit1ded7ea47b8829a06068c3bb5e3ebe471076617a (patch)
tree113e3daefadaec5e25c7b4b8a7ce3cff23ba0327 /drivers/usb/serial
parenta227fd7db74fa05d866790a4b29ba049bb5035cc (diff)
USB: ch341 serial: fix port number changed after resume
This patch fixes the following bug: .plug ch341 usb serial port into a hub port; .ch341 driver bound to the device and /dev/ttyUSB0 comes .open /dev/ttyUSB0 by minicom and we can use the serial successfully .suspend the ch341 usb serial device(such as: echo suspend > power/level) .resume the ch341 usb serial device (such as: echo on > power/level) .new port /dev/ttyUSB1 comes ,and the original /dev/ttyUSB0 still exists, but is no longer usable by minicom The patch adds suspend and resume callback to ch341 usb driver to prevent it from unbinding during suspend. The /dev/ttyUSB0 is not released until being closed, so /dev/ttyUSB1 comes after resume, and the original /dev/ttyUSB0 is no longer usable by minicom. It is really a mess for a minicom user. This patch also adds the reset_resume callback to make it usable after resuming from STR or hibernation, for generally STR or hibernation will make the vbus of root-hub lost. Finally enable the driver's supports_autosuspend, for the device is in working order with it. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/ch341.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index d5ea679e169..ab4cc277aa6 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -529,12 +529,34 @@ static int ch341_tiocmget(struct tty_struct *tty, struct file *file)
return result;
}
+
+static int ch341_reset_resume(struct usb_interface *intf)
+{
+ struct usb_device *dev = interface_to_usbdev(intf);
+ struct usb_serial *serial = NULL;
+ struct ch341_private *priv;
+
+ serial = usb_get_intfdata(intf);
+ priv = usb_get_serial_port_data(serial->port[0]);
+
+ /*reconfigure ch341 serial port after bus-reset*/
+ ch341_configure(dev, priv);
+
+ usb_serial_resume(intf);
+
+ return 0;
+}
+
static struct usb_driver ch341_driver = {
.name = "ch341",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
+ .suspend = usb_serial_suspend,
+ .resume = usb_serial_resume,
+ .reset_resume = ch341_reset_resume,
.id_table = id_table,
.no_dynamic_id = 1,
+ .supports_autosuspend = 1,
};
static struct usb_serial_driver ch341_device = {