This patch implements USB Mass Storage device Class,
which allows the Zephyr target Board to appear
as a USB drive to a host.
This code would invoke disk_read() /disk_write()
hooks which are to be provided by the storage
layer.
The Mass Storage protocol state machine is based on
mbed's implementation. We augment it by adding Zephyr's
USB transport and Storage APIs, and offload disk ops
to a fiber context rather than in the USB irq context.
origin: https://developer.mbed.org/users/mbed_official/code/USBDevice/file/01321bd6ff89/USBMSD
Jira: ZEP-233
Change-Id: I8199598c76da20ab20012d81dac7615f6a366303
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
USB class drivers may need to offload some work from
upcall interrupt context to a background fiber. This
requires some way to defer taking more data from host
till the offloaded work completes. Two APIs are added to
achieve this.
Further USB class drivers sometimes need to set STALL condition
on end-points to signal errors to host.These too are
added.
Change-Id: Ic973522c3394e23d7f9c4c67affc0cd050afc20f
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
