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260 lines
7.4 KiB
260 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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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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#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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f->fs_descriptors = NULL; |
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usb_free_descriptors(f->hs_descriptors); |
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f->hs_descriptors = NULL; |
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usb_free_descriptors(f->ss_descriptors); |
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f->ss_descriptors = NULL; |
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usb_free_descriptors(f->ssp_descriptors); |
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f->ssp_descriptors = NULL; |
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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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