| Message ID | 1611288100-31118-2-git-send-email-wcheng@codeaurora.org |
|---|---|
| State | New |
| Headers | show |
| Series | Re-introduce TX FIFO resize for larger EP bursting | expand |
Hi Wesley, On Thu, Jan 21, 2021 at 08:01:37PM -0800, Wesley Cheng wrote: > Some UDCs may have constraints on how many high bandwidth endpoints it can > support in a certain configuration. This API allows for the composite > driver to pass down the total number of endpoints to the UDC so it can verify > it has the required resources to support the configuration. > > Signed-off-by: Wesley Cheng <wcheng@codeaurora.org> > --- > drivers/usb/gadget/udc/core.c | 9 +++++++++ > include/linux/usb/gadget.h | 2 ++ > 2 files changed, 11 insertions(+) > > diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c > index 4173acd..469962f 100644 > --- a/drivers/usb/gadget/udc/core.c > +++ b/drivers/usb/gadget/udc/core.c > @@ -1003,6 +1003,15 @@ int usb_gadget_ep_match_desc(struct usb_gadget *gadget, > } > EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); > > +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map) You should probably add a kernel-doc for this function. Jack
On Thu, Jan 21, 2021 at 08:01:37PM -0800, Wesley Cheng wrote: > Some UDCs may have constraints on how many high bandwidth endpoints it can > support in a certain configuration. This API allows for the composite > driver to pass down the total number of endpoints to the UDC so it can verify > it has the required resources to support the configuration. > > Signed-off-by: Wesley Cheng <wcheng@codeaurora.org> > --- a/include/linux/usb/gadget.h > +++ b/include/linux/usb/gadget.h > @@ -328,6 +328,7 @@ struct usb_gadget_ops { > struct usb_ep *(*match_ep)(struct usb_gadget *, > struct usb_endpoint_descriptor *, > struct usb_ss_ep_comp_descriptor *); > + int (*check_config)(struct usb_gadget *gadget, unsigned long ep_map); > }; > > /** > @@ -607,6 +608,7 @@ int usb_gadget_connect(struct usb_gadget *gadget); > int usb_gadget_disconnect(struct usb_gadget *gadget); > int usb_gadget_deactivate(struct usb_gadget *gadget); > int usb_gadget_activate(struct usb_gadget *gadget); > +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map); > #else > static inline int usb_gadget_frame_number(struct usb_gadget *gadget) > { return 0; } Don't you also need an entry for the case where CONFIG_USB_GADGET isn't enabled? Alan Stern
On 1/21/2021 9:17 PM, Jack Pham wrote: > Hi Wesley, > > On Thu, Jan 21, 2021 at 08:01:37PM -0800, Wesley Cheng wrote: >> Some UDCs may have constraints on how many high bandwidth endpoints it can >> support in a certain configuration. This API allows for the composite >> driver to pass down the total number of endpoints to the UDC so it can verify >> it has the required resources to support the configuration. >> >> Signed-off-by: Wesley Cheng <wcheng@codeaurora.org> >> --- >> drivers/usb/gadget/udc/core.c | 9 +++++++++ >> include/linux/usb/gadget.h | 2 ++ >> 2 files changed, 11 insertions(+) >> >> diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c >> index 4173acd..469962f 100644 >> --- a/drivers/usb/gadget/udc/core.c >> +++ b/drivers/usb/gadget/udc/core.c >> @@ -1003,6 +1003,15 @@ int usb_gadget_ep_match_desc(struct usb_gadget *gadget, >> } >> EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); >> >> +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map) > > You should probably add a kernel-doc for this function. > > Jack > Hi Jack, Sure, I'll update a bit more about how this API can be used. Thanks Wesley Cheng
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 4173acd..469962f 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1003,6 +1003,15 @@ int usb_gadget_ep_match_desc(struct usb_gadget *gadget, } EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map) +{ + if (!gadget->ops->check_config) + return 0; + + return gadget->ops->check_config(gadget, ep_map); +} +EXPORT_SYMBOL_GPL(usb_gadget_check_config); + /* ------------------------------------------------------------------------- */ static void usb_gadget_state_work(struct work_struct *work) diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index ee04ef2..8393fa8 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -328,6 +328,7 @@ struct usb_gadget_ops { struct usb_ep *(*match_ep)(struct usb_gadget *, struct usb_endpoint_descriptor *, struct usb_ss_ep_comp_descriptor *); + int (*check_config)(struct usb_gadget *gadget, unsigned long ep_map); }; /** @@ -607,6 +608,7 @@ int usb_gadget_connect(struct usb_gadget *gadget); int usb_gadget_disconnect(struct usb_gadget *gadget); int usb_gadget_deactivate(struct usb_gadget *gadget); int usb_gadget_activate(struct usb_gadget *gadget); +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map); #else static inline int usb_gadget_frame_number(struct usb_gadget *gadget) { return 0; }
Some UDCs may have constraints on how many high bandwidth endpoints it can support in a certain configuration. This API allows for the composite driver to pass down the total number of endpoints to the UDC so it can verify it has the required resources to support the configuration. Signed-off-by: Wesley Cheng <wcheng@codeaurora.org> --- drivers/usb/gadget/udc/core.c | 9 +++++++++ include/linux/usb/gadget.h | 2 ++ 2 files changed, 11 insertions(+)