d9345607aa
This patch adds support for USB devices. It uses the Linux Kernel gadget API. Along with this patch comes driver support for the Freescale (arc) USB OTG Core and USB Device Firmware Update (DFU) The serial gadget support is not working at the moment. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
#include <common.h>
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#include <malloc.h>
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#include <errno.h>
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#include <usb/ch9.h>
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/**
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* usb_descriptor_fillbuf - fill buffer with descriptors
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* @buf: Buffer to be filled
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* @buflen: Size of buf
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* @src: Array of descriptor pointers, terminated by null pointer.
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*
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* Copies descriptors into the buffer, returning the length or a
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* negative error code if they can't all be copied. Useful when
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* assembling descriptors for an associated set of interfaces used
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* as part of configuring a composite device; or in other cases where
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* sets of descriptors need to be marshaled.
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*/
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int
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usb_descriptor_fillbuf(void *buf, unsigned buflen,
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const struct usb_descriptor_header **src)
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{
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u8 *dest = buf;
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if (!src)
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return -EINVAL;
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/* fill buffer from src[] until null descriptor ptr */
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for (; NULL != *src; src++) {
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unsigned len = (*src)->bLength;
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if (len > buflen)
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return -EINVAL;
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memcpy(dest, *src, len);
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buflen -= len;
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dest += len;
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}
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return dest - (u8 *)buf;
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}
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/**
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* usb_copy_descriptors - copy a vector of USB descriptors
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* @src: null-terminated vector to copy
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* Context: initialization code, which may sleep
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*
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* This makes a copy of a vector of USB descriptors. Its primary use
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* is to support usb_function objects which can have multiple copies,
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* each needing different descriptors. Functions may have static
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* tables of descriptors, which are used as templates and customized
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* with identifiers (for interfaces, strings, endpoints, and more)
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* as needed by a given function instance.
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*/
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struct usb_descriptor_header **__init
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usb_copy_descriptors(struct usb_descriptor_header **src)
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{
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struct usb_descriptor_header **tmp;
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unsigned bytes;
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unsigned n_desc;
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void *mem;
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struct usb_descriptor_header **ret;
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/* count descriptors and their sizes; then add vector size */
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for (bytes = 0, n_desc = 0, tmp = src; *tmp; tmp++, n_desc++)
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bytes += (*tmp)->bLength;
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bytes += (n_desc + 1) * sizeof(*tmp);
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mem = kmalloc(bytes, GFP_KERNEL);
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if (!mem)
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return NULL;
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/* fill in pointers starting at "tmp",
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* to descriptors copied starting at "mem";
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* and return "ret"
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*/
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tmp = mem;
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ret = mem;
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mem += (n_desc + 1) * sizeof(*tmp);
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while (*src) {
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memcpy(mem, *src, (*src)->bLength);
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*tmp = mem;
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tmp++;
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mem += (*src)->bLength;
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src++;
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}
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*tmp = NULL;
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return ret;
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}
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/**
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* usb_find_endpoint - find a copy of an endpoint descriptor
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* @src: original vector of descriptors
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* @copy: copy of @src
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* @match: endpoint descriptor found in @src
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*
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* This returns the copy of the @match descriptor made for @copy. Its
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* intended use is to help remembering the endpoint descriptor to use
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* when enabling a given endpoint.
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*/
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struct usb_endpoint_descriptor *__init
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usb_find_endpoint(
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struct usb_descriptor_header **src,
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struct usb_descriptor_header **copy,
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struct usb_endpoint_descriptor *match
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)
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{
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while (*src) {
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if (*src == (void *) match)
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return (void *)*copy;
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src++;
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copy++;
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}
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return NULL;
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}
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