mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Michal Nazarewicz](/assets/img/avatar_default.png)
__init, __initdata and __exit tags have have been removed from various files to make it possible for gadgets that do not use the __init/__exit tags to use those. Files in question are related to: * the core composite framework, * the mass storage function (fixing a section mismatch) and * ethernet driver (ACM, ECM, RNDIS). Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
192 lines
5.6 KiB
C
192 lines
5.6 KiB
C
/*
|
|
* usb/gadget/config.c -- simplify building config descriptors
|
|
*
|
|
* Copyright (C) 2003 David Brownell
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/string.h>
|
|
#include <linux/device.h>
|
|
|
|
#include <linux/usb/ch9.h>
|
|
#include <linux/usb/gadget.h>
|
|
|
|
|
|
/**
|
|
* usb_descriptor_fillbuf - fill buffer with descriptors
|
|
* @buf: Buffer to be filled
|
|
* @buflen: Size of buf
|
|
* @src: Array of descriptor pointers, terminated by null pointer.
|
|
*
|
|
* Copies descriptors into the buffer, returning the length or a
|
|
* negative error code if they can't all be copied. Useful when
|
|
* assembling descriptors for an associated set of interfaces used
|
|
* as part of configuring a composite device; or in other cases where
|
|
* sets of descriptors need to be marshaled.
|
|
*/
|
|
int
|
|
usb_descriptor_fillbuf(void *buf, unsigned buflen,
|
|
const struct usb_descriptor_header **src)
|
|
{
|
|
u8 *dest = buf;
|
|
|
|
if (!src)
|
|
return -EINVAL;
|
|
|
|
/* fill buffer from src[] until null descriptor ptr */
|
|
for (; NULL != *src; src++) {
|
|
unsigned len = (*src)->bLength;
|
|
|
|
if (len > buflen)
|
|
return -EINVAL;
|
|
memcpy(dest, *src, len);
|
|
buflen -= len;
|
|
dest += len;
|
|
}
|
|
return dest - (u8 *)buf;
|
|
}
|
|
|
|
|
|
/**
|
|
* usb_gadget_config_buf - builts a complete configuration descriptor
|
|
* @config: Header for the descriptor, including characteristics such
|
|
* as power requirements and number of interfaces.
|
|
* @desc: Null-terminated vector of pointers to the descriptors (interface,
|
|
* endpoint, etc) defining all functions in this device configuration.
|
|
* @buf: Buffer for the resulting configuration descriptor.
|
|
* @length: Length of buffer. If this is not big enough to hold the
|
|
* entire configuration descriptor, an error code will be returned.
|
|
*
|
|
* This copies descriptors into the response buffer, building a descriptor
|
|
* for that configuration. It returns the buffer length or a negative
|
|
* status code. The config.wTotalLength field is set to match the length
|
|
* of the result, but other descriptor fields (including power usage and
|
|
* interface count) must be set by the caller.
|
|
*
|
|
* Gadget drivers could use this when constructing a config descriptor
|
|
* in response to USB_REQ_GET_DESCRIPTOR. They will need to patch the
|
|
* resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.
|
|
*/
|
|
int usb_gadget_config_buf(
|
|
const struct usb_config_descriptor *config,
|
|
void *buf,
|
|
unsigned length,
|
|
const struct usb_descriptor_header **desc
|
|
)
|
|
{
|
|
struct usb_config_descriptor *cp = buf;
|
|
int len;
|
|
|
|
/* config descriptor first */
|
|
if (length < USB_DT_CONFIG_SIZE || !desc)
|
|
return -EINVAL;
|
|
*cp = *config;
|
|
|
|
/* then interface/endpoint/class/vendor/... */
|
|
len = usb_descriptor_fillbuf(USB_DT_CONFIG_SIZE + (u8*)buf,
|
|
length - USB_DT_CONFIG_SIZE, desc);
|
|
if (len < 0)
|
|
return len;
|
|
len += USB_DT_CONFIG_SIZE;
|
|
if (len > 0xffff)
|
|
return -EINVAL;
|
|
|
|
/* patch up the config descriptor */
|
|
cp->bLength = USB_DT_CONFIG_SIZE;
|
|
cp->bDescriptorType = USB_DT_CONFIG;
|
|
cp->wTotalLength = cpu_to_le16(len);
|
|
cp->bmAttributes |= USB_CONFIG_ATT_ONE;
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* usb_copy_descriptors - copy a vector of USB descriptors
|
|
* @src: null-terminated vector to copy
|
|
* Context: initialization code, which may sleep
|
|
*
|
|
* This makes a copy of a vector of USB descriptors. Its primary use
|
|
* is to support usb_function objects which can have multiple copies,
|
|
* each needing different descriptors. Functions may have static
|
|
* tables of descriptors, which are used as templates and customized
|
|
* with identifiers (for interfaces, strings, endpoints, and more)
|
|
* as needed by a given function instance.
|
|
*/
|
|
struct usb_descriptor_header **
|
|
usb_copy_descriptors(struct usb_descriptor_header **src)
|
|
{
|
|
struct usb_descriptor_header **tmp;
|
|
unsigned bytes;
|
|
unsigned n_desc;
|
|
void *mem;
|
|
struct usb_descriptor_header **ret;
|
|
|
|
/* count descriptors and their sizes; then add vector size */
|
|
for (bytes = 0, n_desc = 0, tmp = src; *tmp; tmp++, n_desc++)
|
|
bytes += (*tmp)->bLength;
|
|
bytes += (n_desc + 1) * sizeof(*tmp);
|
|
|
|
mem = kmalloc(bytes, GFP_KERNEL);
|
|
if (!mem)
|
|
return NULL;
|
|
|
|
/* fill in pointers starting at "tmp",
|
|
* to descriptors copied starting at "mem";
|
|
* and return "ret"
|
|
*/
|
|
tmp = mem;
|
|
ret = mem;
|
|
mem += (n_desc + 1) * sizeof(*tmp);
|
|
while (*src) {
|
|
memcpy(mem, *src, (*src)->bLength);
|
|
*tmp = mem;
|
|
tmp++;
|
|
mem += (*src)->bLength;
|
|
src++;
|
|
}
|
|
*tmp = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* usb_find_endpoint - find a copy of an endpoint descriptor
|
|
* @src: original vector of descriptors
|
|
* @copy: copy of @src
|
|
* @match: endpoint descriptor found in @src
|
|
*
|
|
* This returns the copy of the @match descriptor made for @copy. Its
|
|
* intended use is to help remembering the endpoint descriptor to use
|
|
* when enabling a given endpoint.
|
|
*/
|
|
struct usb_endpoint_descriptor *
|
|
usb_find_endpoint(
|
|
struct usb_descriptor_header **src,
|
|
struct usb_descriptor_header **copy,
|
|
struct usb_endpoint_descriptor *match
|
|
)
|
|
{
|
|
while (*src) {
|
|
if (*src == (void *) match)
|
|
return (void *)*copy;
|
|
src++;
|
|
copy++;
|
|
}
|
|
return NULL;
|
|
}
|