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author | Ming Lei <tom.leiming@gmail.com> | 2009-02-20 21:23:09 +0800 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-24 16:20:36 -0700 |
commit | 1ded7ea47b8829a06068c3bb5e3ebe471076617a (patch) | |
tree | 113e3daefadaec5e25c7b4b8a7ce3cff23ba0327 /Documentation/usb | |
parent | a227fd7db74fa05d866790a4b29ba049bb5035cc (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 'Documentation/usb')
0 files changed, 0 insertions, 0 deletions