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usb: gadget: add quirk_ep_out_aligned_size field to struct usb_gadget

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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>
This commit is contained in:
David Cohen 2013-12-09 15:55:35 -08:00 committed by Felipe Balbi
parent d8318d7f6b
commit 0b2d2bbade
1 changed files with 20 additions and 0 deletions
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20
include/linux/usb/gadget.h
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@ -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))
@ -558,6 +561,23 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
list_for_each_entry(tmp, &(gadget)->ep_list, ep_list)
/**
* 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