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authorFelipe F. Tonello <eu@felipetonello.com>2016-08-08 21:30:04 +0100
committerFelipe Balbi <felipe.balbi@linux.intel.com>2016-08-25 12:13:13 +0300
commit16b114a6d7973cf027e4c2b23eae1076eaf98c25 (patch)
tree6790fe0f2c0a2a5ef926819fa27b43f73059e0af
parent6ac47090eef0c4358b04a974c4a5ac3d9bf44f79 (diff)
usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_align
USB spec specifies wMaxPacketSize to be little endian (as other properties), so when using this variable in the driver we should convert to the current CPU endianness if necessary. This patch also introduces usb_ep_align() which does always returns the aligned buffer size for an endpoint. This is useful to be used by USB requests allocator functions. Signed-off-by: Felipe F. Tonello <eu@felipetonello.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
-rw-r--r--include/linux/usb/gadget.h17
1 files changed, 14 insertions, 3 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 612dbdfa388e..3cc93237ff98 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -418,8 +418,20 @@ 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 - returns @len aligned to ep's maxpacketsize.
+ * @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 to align buffer's size to an ep's maxpacketsize.
+ */
+static inline size_t usb_ep_align(struct usb_ep *ep, size_t len)
+{
+ return round_up(len, (size_t)le16_to_cpu(ep->desc->wMaxPacketSize));
+}
+
+/**
* usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget
- * requires quirk_ep_out_aligned_size, otherwise reguens len.
+ * requires quirk_ep_out_aligned_size, otherwise returns 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
@@ -430,8 +442,7 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
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);
+ return g->quirk_ep_out_aligned_size ? usb_ep_align(ep, len) : len;
}
/**