On Mon, 11 Feb 2019, Martin Townsend wrote: > Hi, > > I've been trying to find a way of informing user space that the eject > button has been pressed on the host PC. I put some debug in > do_scsi_command and I only see the TEST_UNIT_READY command with > nothing in it to distinguish it from other TEST_UNIT_READY commands. > After loading the gadget kernel module with removable=y I then see > commands with id 0x03 Request Sense but reading up on this I can't see > how this would help either. The host computer should send a START-STOP command when it wants to eject the media. > Is there anywhere else in the mass storage gadget code that is called > when the media has been ejected event occurs. fsg_lun_close(). That routine gets called from do_start_stop() when an eject event occurs. (It also gets called from some other places in other circumstances, such as when the gadget driver is unloaded.) > Failing that is there > any other way I could poll something something from userspace say is > sysfs that could be used to detect that the host has finished with the > backing file/eject media has occurred. No, that's pretty much it. Alan Stern > Many Thanks in advance, > Martin.
