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| author | David Cohen <david.a.cohen@linux.intel.com> | 2013-12-10 00:55:35 +0100 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2014-05-15 07:26:40 +0200 |
| commit | 95dbdec870fcf9933916f67710b565e6da82b797 (patch) | |
| tree | 7c428261714535af9a6a7a6b647dd75683ffa4db /include | |
| parent | 6654cf51bde0c12a49b0da0607ccea3299619084 (diff) | |
| download | linux-3.10-95dbdec870fcf9933916f67710b565e6da82b797.tar.gz linux-3.10-95dbdec870fcf9933916f67710b565e6da82b797.tar.bz2 linux-3.10-95dbdec870fcf9933916f67710b565e6da82b797.zip | |
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>
[backport from mainline]
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Diffstat (limited to 'include')
| -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 6241ace2d50..1b7a4fe325a 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -500,6 +500,8 @@ 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 @@ -539,6 +541,7 @@ struct usb_gadget { unsigned a_hnp_support:1; unsigned a_alt_hnp_support:1; atomic_t connect_count; + unsigned quirk_ep_out_aligned_size:1; }; static inline void set_gadget_data(struct usb_gadget *gadget, void *data) @@ -556,6 +559,23 @@ 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 */ |