mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
4320280001
Use (foo *) instead of (foo*). Signed-off-by: Sandhya Bankar <bankarsandhya512@gmail.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
260 lines
7.5 KiB
C
260 lines
7.5 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.
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/list.h>
|
|
#include <linux/string.h>
|
|
#include <linux/device.h>
|
|
|
|
#include <linux/usb/ch9.h>
|
|
#include <linux/usb/gadget.h>
|
|
#include <linux/usb/composite.h>
|
|
#include <linux/usb/otg.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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_descriptor_fillbuf);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_config_buf);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_copy_descriptors);
|
|
|
|
int usb_assign_descriptors(struct usb_function *f,
|
|
struct usb_descriptor_header **fs,
|
|
struct usb_descriptor_header **hs,
|
|
struct usb_descriptor_header **ss,
|
|
struct usb_descriptor_header **ssp)
|
|
{
|
|
struct usb_gadget *g = f->config->cdev->gadget;
|
|
|
|
if (fs) {
|
|
f->fs_descriptors = usb_copy_descriptors(fs);
|
|
if (!f->fs_descriptors)
|
|
goto err;
|
|
}
|
|
if (hs && gadget_is_dualspeed(g)) {
|
|
f->hs_descriptors = usb_copy_descriptors(hs);
|
|
if (!f->hs_descriptors)
|
|
goto err;
|
|
}
|
|
if (ss && gadget_is_superspeed(g)) {
|
|
f->ss_descriptors = usb_copy_descriptors(ss);
|
|
if (!f->ss_descriptors)
|
|
goto err;
|
|
}
|
|
if (ssp && gadget_is_superspeed_plus(g)) {
|
|
f->ssp_descriptors = usb_copy_descriptors(ssp);
|
|
if (!f->ssp_descriptors)
|
|
goto err;
|
|
}
|
|
return 0;
|
|
err:
|
|
usb_free_all_descriptors(f);
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_assign_descriptors);
|
|
|
|
void usb_free_all_descriptors(struct usb_function *f)
|
|
{
|
|
usb_free_descriptors(f->fs_descriptors);
|
|
usb_free_descriptors(f->hs_descriptors);
|
|
usb_free_descriptors(f->ss_descriptors);
|
|
usb_free_descriptors(f->ssp_descriptors);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_free_all_descriptors);
|
|
|
|
struct usb_descriptor_header *usb_otg_descriptor_alloc(
|
|
struct usb_gadget *gadget)
|
|
{
|
|
struct usb_descriptor_header *otg_desc;
|
|
unsigned length = 0;
|
|
|
|
if (gadget->otg_caps && (gadget->otg_caps->otg_rev >= 0x0200))
|
|
length = sizeof(struct usb_otg20_descriptor);
|
|
else
|
|
length = sizeof(struct usb_otg_descriptor);
|
|
|
|
otg_desc = kzalloc(length, GFP_KERNEL);
|
|
return otg_desc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_otg_descriptor_alloc);
|
|
|
|
int usb_otg_descriptor_init(struct usb_gadget *gadget,
|
|
struct usb_descriptor_header *otg_desc)
|
|
{
|
|
struct usb_otg_descriptor *otg1x_desc;
|
|
struct usb_otg20_descriptor *otg20_desc;
|
|
struct usb_otg_caps *otg_caps = gadget->otg_caps;
|
|
u8 otg_attributes = 0;
|
|
|
|
if (!otg_desc)
|
|
return -EINVAL;
|
|
|
|
if (otg_caps && otg_caps->otg_rev) {
|
|
if (otg_caps->hnp_support)
|
|
otg_attributes |= USB_OTG_HNP;
|
|
if (otg_caps->srp_support)
|
|
otg_attributes |= USB_OTG_SRP;
|
|
if (otg_caps->adp_support && (otg_caps->otg_rev >= 0x0200))
|
|
otg_attributes |= USB_OTG_ADP;
|
|
} else {
|
|
otg_attributes = USB_OTG_SRP | USB_OTG_HNP;
|
|
}
|
|
|
|
if (otg_caps && (otg_caps->otg_rev >= 0x0200)) {
|
|
otg20_desc = (struct usb_otg20_descriptor *)otg_desc;
|
|
otg20_desc->bLength = sizeof(struct usb_otg20_descriptor);
|
|
otg20_desc->bDescriptorType = USB_DT_OTG;
|
|
otg20_desc->bmAttributes = otg_attributes;
|
|
otg20_desc->bcdOTG = cpu_to_le16(otg_caps->otg_rev);
|
|
} else {
|
|
otg1x_desc = (struct usb_otg_descriptor *)otg_desc;
|
|
otg1x_desc->bLength = sizeof(struct usb_otg_descriptor);
|
|
otg1x_desc->bDescriptorType = USB_DT_OTG;
|
|
otg1x_desc->bmAttributes = otg_attributes;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_otg_descriptor_init);
|