![John Youn](/assets/img/avatar_default.png)
Add a ssp_descriptors member to struct usb_function and handle the initialization and cleanup of it. This holds the SuperSpeedPlus descriptors for a function that supports SuperSpeedPlus. This is added by usb_assign_descriptors(). Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
261 lines
7.5 KiB
C
261 lines
7.5 KiB
C
/*
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* usb/gadget/config.c -- simplify building config descriptors
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*
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* Copyright (C) 2003 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/composite.h>
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#include <linux/usb/otg.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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EXPORT_SYMBOL_GPL(usb_descriptor_fillbuf);
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/**
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* usb_gadget_config_buf - builts a complete configuration descriptor
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* @config: Header for the descriptor, including characteristics such
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* as power requirements and number of interfaces.
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* @desc: Null-terminated vector of pointers to the descriptors (interface,
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* endpoint, etc) defining all functions in this device configuration.
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* @buf: Buffer for the resulting configuration descriptor.
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* @length: Length of buffer. If this is not big enough to hold the
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* entire configuration descriptor, an error code will be returned.
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*
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* This copies descriptors into the response buffer, building a descriptor
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* for that configuration. It returns the buffer length or a negative
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* status code. The config.wTotalLength field is set to match the length
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* of the result, but other descriptor fields (including power usage and
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* interface count) must be set by the caller.
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*
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* Gadget drivers could use this when constructing a config descriptor
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* in response to USB_REQ_GET_DESCRIPTOR. They will need to patch the
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* resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.
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*/
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int usb_gadget_config_buf(
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const struct usb_config_descriptor *config,
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void *buf,
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unsigned length,
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const struct usb_descriptor_header **desc
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)
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{
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struct usb_config_descriptor *cp = buf;
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int len;
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/* config descriptor first */
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if (length < USB_DT_CONFIG_SIZE || !desc)
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return -EINVAL;
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*cp = *config;
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/* then interface/endpoint/class/vendor/... */
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len = usb_descriptor_fillbuf(USB_DT_CONFIG_SIZE + (u8*)buf,
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length - USB_DT_CONFIG_SIZE, desc);
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if (len < 0)
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return len;
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len += USB_DT_CONFIG_SIZE;
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if (len > 0xffff)
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return -EINVAL;
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/* patch up the config descriptor */
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cp->bLength = USB_DT_CONFIG_SIZE;
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cp->bDescriptorType = USB_DT_CONFIG;
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cp->wTotalLength = cpu_to_le16(len);
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cp->bmAttributes |= USB_CONFIG_ATT_ONE;
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return len;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_config_buf);
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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 **
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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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EXPORT_SYMBOL_GPL(usb_copy_descriptors);
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int usb_assign_descriptors(struct usb_function *f,
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struct usb_descriptor_header **fs,
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struct usb_descriptor_header **hs,
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struct usb_descriptor_header **ss,
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struct usb_descriptor_header **ssp)
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{
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struct usb_gadget *g = f->config->cdev->gadget;
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if (fs) {
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f->fs_descriptors = usb_copy_descriptors(fs);
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if (!f->fs_descriptors)
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goto err;
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}
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if (hs && gadget_is_dualspeed(g)) {
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f->hs_descriptors = usb_copy_descriptors(hs);
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if (!f->hs_descriptors)
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goto err;
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}
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if (ss && gadget_is_superspeed(g)) {
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f->ss_descriptors = usb_copy_descriptors(ss);
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if (!f->ss_descriptors)
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goto err;
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}
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if (ssp && gadget_is_superspeed_plus(g)) {
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f->ssp_descriptors = usb_copy_descriptors(ssp);
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if (!f->ssp_descriptors)
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goto err;
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}
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return 0;
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err:
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usb_free_all_descriptors(f);
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return -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(usb_assign_descriptors);
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void usb_free_all_descriptors(struct usb_function *f)
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{
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usb_free_descriptors(f->fs_descriptors);
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usb_free_descriptors(f->hs_descriptors);
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usb_free_descriptors(f->ss_descriptors);
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usb_free_descriptors(f->ssp_descriptors);
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}
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EXPORT_SYMBOL_GPL(usb_free_all_descriptors);
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struct usb_descriptor_header *usb_otg_descriptor_alloc(
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struct usb_gadget *gadget)
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{
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struct usb_descriptor_header *otg_desc;
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unsigned length = 0;
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if (gadget->otg_caps && (gadget->otg_caps->otg_rev >= 0x0200))
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length = sizeof(struct usb_otg20_descriptor);
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else
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length = sizeof(struct usb_otg_descriptor);
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otg_desc = kzalloc(length, GFP_KERNEL);
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return otg_desc;
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}
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EXPORT_SYMBOL_GPL(usb_otg_descriptor_alloc);
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int usb_otg_descriptor_init(struct usb_gadget *gadget,
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struct usb_descriptor_header *otg_desc)
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{
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struct usb_otg_descriptor *otg1x_desc;
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struct usb_otg20_descriptor *otg20_desc;
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struct usb_otg_caps *otg_caps = gadget->otg_caps;
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u8 otg_attributes = 0;
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if (!otg_desc)
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return -EINVAL;
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if (otg_caps && otg_caps->otg_rev) {
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if (otg_caps->hnp_support)
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otg_attributes |= USB_OTG_HNP;
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if (otg_caps->srp_support)
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otg_attributes |= USB_OTG_SRP;
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if (otg_caps->adp_support && (otg_caps->otg_rev >= 0x0200))
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otg_attributes |= USB_OTG_ADP;
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} else {
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otg_attributes = USB_OTG_SRP | USB_OTG_HNP;
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}
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if (otg_caps && (otg_caps->otg_rev >= 0x0200)) {
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otg20_desc = (struct usb_otg20_descriptor *)otg_desc;
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otg20_desc->bLength = sizeof(struct usb_otg20_descriptor);
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otg20_desc->bDescriptorType = USB_DT_OTG;
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otg20_desc->bmAttributes = otg_attributes;
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otg20_desc->bcdOTG = cpu_to_le16(otg_caps->otg_rev);
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} else {
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otg1x_desc = (struct usb_otg_descriptor *)otg_desc;
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otg1x_desc->bLength = sizeof(struct usb_otg_descriptor);
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otg1x_desc->bDescriptorType = USB_DT_OTG;
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otg1x_desc->bmAttributes = otg_attributes;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(usb_otg_descriptor_init);
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