diff options
| author | Peter Korsgaard <peter@korsgaard.com> | 2024-01-26 21:32:08 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-01-27 17:39:21 -0800 |
| commit | 43a029724d1c8219cc4e58e9fafbeedd1bc283fa (patch) | |
| tree | e833ba14810af81519f5804792420f2f8baa4553 /Documentation/ABI | |
| parent | 2d2a3349521de1757b685b664af849b0824c205d (diff) | |
| download | linux-stable-43a029724d1c8219cc4e58e9fafbeedd1bc283fa.tar.gz linux-stable-43a029724d1c8219cc4e58e9fafbeedd1bc283fa.tar.bz2 linux-stable-43a029724d1c8219cc4e58e9fafbeedd1bc283fa.zip | |
usb: gadget: f_fs: expose ready state in configfs
When a USB gadget is configured through configfs with 1 or more f_fs
functions, then the logic setting up the gadget configuration has to wait
until the user space code (typically separate applications) responsible for
those functions have written their descriptors before the gadget can be
activated.
The f_fs instance already knows if this has been done, so expose it through
a "ready" attribute in configfs for easier synchronization.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Link: https://lore.kernel.org/r/20240126203208.2482573-1-peter@korsgaard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/configfs-usb-gadget-ffs | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-ffs b/Documentation/ABI/testing/configfs-usb-gadget-ffs index e39b27653c65..bf8936ff6d38 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget-ffs +++ b/Documentation/ABI/testing/configfs-usb-gadget-ffs @@ -4,6 +4,14 @@ KernelVersion: 3.13 Description: The purpose of this directory is to create and remove it. A corresponding USB function instance is created/removed. - There are no attributes here. - All parameters are set through FunctionFS. + All attributes are read only: + + ============= ============================================ + ready 1 if the function is ready to be used, E.G. + if userspace has written descriptors and + strings to ep0, so the gadget can be + enabled - 0 otherwise. + ============= ============================================ + + All other parameters are set through FunctionFS. |