usb: gadget: f_fs: handle control requests not directed to interface or endpoint
Introduces a new FunctionFS descriptor flag named
FUNCTIONFS_ALL_CTRL_RECIP. When this flag is enabled, control requests,
which are not explicitly directed to an interface or endpoint, can be
handled.
This allows FunctionFS userspace drivers to process non-standard
control requests.
Signed-off-by: Felix Hädicke <felixhaedicke@web.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 5c8429f..d7acab8 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -98,6 +98,8 @@
static void ffs_func_disable(struct usb_function *);
static int ffs_func_setup(struct usb_function *,
const struct usb_ctrlrequest *);
+static bool ffs_func_req_match(struct usb_function *,
+ const struct usb_ctrlrequest *);
static void ffs_func_suspend(struct usb_function *);
static void ffs_func_resume(struct usb_function *);
@@ -2243,7 +2245,8 @@
FUNCTIONFS_HAS_SS_DESC |
FUNCTIONFS_HAS_MS_OS_DESC |
FUNCTIONFS_VIRTUAL_ADDR |
- FUNCTIONFS_EVENTFD)) {
+ FUNCTIONFS_EVENTFD |
+ FUNCTIONFS_ALL_CTRL_RECIP)) {
ret = -ENOSYS;
goto error;
}
@@ -3094,8 +3097,9 @@
* handle them. All other either handled by composite or
* passed to usb_configuration->setup() (if one is set). No
* matter, we will handle requests directed to endpoint here
- * as well (as it's straightforward) but what to do with any
- * other request?
+ * as well (as it's straightforward). Other request recipient
+ * types are only handled when the user flag FUNCTIONFS_ALL_CTRL_RECIP
+ * is being used.
*/
if (ffs->state != FFS_ACTIVE)
return -ENODEV;
@@ -3116,7 +3120,10 @@
break;
default:
- return -EOPNOTSUPP;
+ if (func->ffs->user_flags & FUNCTIONFS_ALL_CTRL_RECIP)
+ ret = le16_to_cpu(creq->wIndex);
+ else
+ return -EOPNOTSUPP;
}
spin_lock_irqsave(&ffs->ev.waitq.lock, flags);
@@ -3128,6 +3135,24 @@
return 0;
}
+static bool ffs_func_req_match(struct usb_function *f,
+ const struct usb_ctrlrequest *creq)
+{
+ struct ffs_function *func = ffs_func_from_usb(f);
+
+ switch (creq->bRequestType & USB_RECIP_MASK) {
+ case USB_RECIP_INTERFACE:
+ return ffs_func_revmap_intf(func,
+ le16_to_cpu(creq->wIndex) >= 0);
+ case USB_RECIP_ENDPOINT:
+ return ffs_func_revmap_ep(func,
+ le16_to_cpu(creq->wIndex) >= 0);
+ default:
+ return (bool) (func->ffs->user_flags &
+ FUNCTIONFS_ALL_CTRL_RECIP);
+ }
+}
+
static void ffs_func_suspend(struct usb_function *f)
{
ENTER();
@@ -3378,6 +3403,7 @@
func->function.set_alt = ffs_func_set_alt;
func->function.disable = ffs_func_disable;
func->function.setup = ffs_func_setup;
+ func->function.req_match = ffs_func_req_match;
func->function.suspend = ffs_func_suspend;
func->function.resume = ffs_func_resume;
func->function.free_func = ffs_free;