usb: gadget: f_fs: expose ready state in configfs

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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>

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Peter Korsgaard 2024-01-26 21:32:08 +01:00 • committed by Greg Kroah-Hartman

parent 2d2a334952

commit 43a029724d

3 changed files with 38 additions and 2 deletions

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12

Documentation/ABI/testing/configfs-usb-gadget-ffs

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8

Documentation/usb/gadget-testing.rst

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20

drivers/usb/gadget/function/f_fs.c

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