diff options
| author | David Cohen <david.a.cohen@linux.intel.com> | 2013-12-09 15:55:35 -0800 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-12-09 22:44:05 -0600 |
| commit | 0b2d2bbade59ab2067f326d6dbc2628bee227fd5 (patch) | |
| tree | 8897b37afb209edd04aa0f5773493ec057a6f2ea /include/linux/usb | |
| parent | d8318d7f6bd08eba36ed2a7a23ac5389115958bc (diff) | |
usb: gadget: add quirk_ep_out_aligned_size field to struct usb_gadget
Due to USB controllers may have different restrictions, usb gadget layer
needs to provide a generic way to inform gadget functions to complain
with non-standard requirements.
This patch adds 'quirk_ep_out_aligned_size' field to struct usb_gadget
to inform when controller's epout requires buffer size to be aligned to
MaxPacketSize. A helper is also provided to align buffer size when
necessary.
Cc: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/gadget.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 23b3bfd0a842..cae8a6216551 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -502,6 +502,8 @@ struct usb_gadget_ops { * only supports HNP on a different root port. * @b_hnp_enable: OTG device feature flag, indicating that the A-Host * enabled HNP support. + * @quirk_ep_out_aligned_size: epout requires buffer size to be aligned to + * MaxPacketSize. * * Gadgets have a mostly-portable "gadget driver" implementing device * functions, handling all usb configurations and interfaces. Gadget @@ -541,6 +543,7 @@ struct usb_gadget { unsigned b_hnp_enable:1; unsigned a_hnp_support:1; unsigned a_alt_hnp_support:1; + unsigned quirk_ep_out_aligned_size:1; }; #define work_to_gadget(w) (container_of((w), struct usb_gadget, work)) @@ -559,6 +562,23 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) /** + * usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget + * requires quirk_ep_out_aligned_size, otherwise reguens len. + * @g: controller to check for quirk + * @ep: the endpoint whose maxpacketsize is used to align @len + * @len: buffer size's length to align to @ep's maxpacketsize + * + * This helper is used in case it's required for any reason to check and maybe + * align buffer's size to an ep's maxpacketsize. + */ +static inline size_t +usb_ep_align_maybe(struct usb_gadget *g, struct usb_ep *ep, size_t len) +{ + return !g->quirk_ep_out_aligned_size ? len : + round_up(len, (size_t)ep->desc->wMaxPacketSize); +} + +/** * gadget_is_dualspeed - return true iff the hardware handles high speed * @g: controller that might support both high and full speeds */ |