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[PATCH] USB dummy_hcd: Partial OTG emulation 

Partial OTG support for dummy_hcd, mostly as a framework for further work.
It emulates the new OTG flags in the host and peripheral frameworks, if
that option is configured.  But it's incomplete:

  - Resetting the peripheral needs to clear the OTG state bits;
    a second enumeration won't work correctly.

  - This stops modeling HNP right when roles should switch the first time.
    It should probably disconnect, then set the usb_bus.is_b_host and
    usb_gadget.is_a_peripheral flags; then it'd enumerate almost normally,
    except for the role reversal.  Roles could then switch a second time,
    back to "normal" (with those flags cleared).

  - SRP should be modeled as "resume from port-unpowered", which is
    a state that usbcore doesn't yet use.

HNP can be triggered by enabling the OTG whitelist and configuring a
gadget driver that's not in that list; or by configuring Gadget Zero
to identify itself as the HNP test device.

Sent-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Alan Stern 2005-05-02 11:25:17 -04:00 committed by Greg Kroah-Hartman
parent 65111084c6
commit 5742b0c950
1 changed files with 28 additions and 2 deletions
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30
drivers/usb/gadget/dummy_hcd.c
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@ -601,8 +601,10 @@ static int dummy_wakeup (struct usb_gadget *_gadget)
struct dummy *dum;
dum = gadget_to_dummy (_gadget);
if ((dum->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) == 0
|| !(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)))
if (!(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND))
|| !(dum->devstatus &
( (1 << USB_DEVICE_B_HNP_ENABLE)
| (1 << USB_DEVICE_REMOTE_WAKEUP))))
return -EINVAL;
/* hub notices our request, issues downstream resume, etc */
@ -713,6 +715,9 @@ usb_gadget_register_driver (struct usb_gadget_driver *driver)
dum->gadget.ops = &dummy_ops;
dum->gadget.is_dualspeed = 1;
/* maybe claim OTG support, though we won't complete HNP */
dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
dum->devstatus = 0;
dum->resuming = 0;
@ -1215,6 +1220,16 @@ restart:
switch (setup.wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
break;
case USB_DEVICE_B_HNP_ENABLE:
dum->gadget.b_hnp_enable = 1;
break;
case USB_DEVICE_A_HNP_SUPPORT:
dum->gadget.a_hnp_support = 1;
break;
case USB_DEVICE_A_ALT_HNP_SUPPORT:
dum->gadget.a_alt_hnp_support
= 1;
break;
default:
value = -EOPNOTSUPP;
}
@ -1533,6 +1548,13 @@ static int dummy_hub_control (
spin_unlock (&dum->lock);
dum->driver->suspend (&dum->gadget);
spin_lock (&dum->lock);
/* HNP would happen here; for now we
* assume b_bus_req is always true.
*/
if (((1 << USB_DEVICE_B_HNP_ENABLE)
& dum->devstatus) != 0)
dev_dbg (dummy_dev(dum),
"no HNP yet!\n");
}
}
break;
@ -1648,6 +1670,10 @@ static int dummy_start (struct usb_hcd *hcd)
hcd->power_budget = 8;
hcd->state = HC_STATE_RUNNING;
#ifdef CONFIG_USB_OTG
hcd->self.otg_port = 1;
#endif
/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
device_create_file (dummy_dev(dum), &dev_attr_urbs);
return 0;