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path: root/drivers/usb/gadget/config.c
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Diffstat (limited to 'drivers/usb/gadget/config.c')
-rw-r--r--drivers/usb/gadget/config.c140
1 files changed, 78 insertions, 62 deletions
diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
index 34e12fc52c23..256364d4b941 100644
--- a/drivers/usb/gadget/config.c
+++ b/drivers/usb/gadget/config.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
* 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>
@@ -20,6 +16,7 @@
#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
@@ -57,59 +54,6 @@ usb_descriptor_fillbuf(void *buf, unsigned buflen,
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
@@ -162,25 +106,37 @@ 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 **ss,
+ struct usb_descriptor_header **ssp)
{
- struct usb_gadget *g = f->config->cdev->gadget;
+ /* super-speed-plus descriptor falls back to super-speed one,
+ * if such a descriptor was provided, thus avoiding a NULL
+ * pointer dereference if a 5gbps capable gadget is used with
+ * a 10gbps capable config (device port + cable + host port)
+ */
+ if (!ssp)
+ ssp = ss;
if (fs) {
f->fs_descriptors = usb_copy_descriptors(fs);
if (!f->fs_descriptors)
goto err;
}
- if (hs && gadget_is_dualspeed(g)) {
+ if (hs) {
f->hs_descriptors = usb_copy_descriptors(hs);
if (!f->hs_descriptors)
goto err;
}
- if (ss && gadget_is_superspeed(g)) {
+ if (ss) {
f->ss_descriptors = usb_copy_descriptors(ss);
if (!f->ss_descriptors)
goto err;
}
+ if (ssp) {
+ f->ssp_descriptors = usb_copy_descriptors(ssp);
+ if (!f->ssp_descriptors)
+ goto err;
+ }
return 0;
err:
usb_free_all_descriptors(f);
@@ -191,7 +147,67 @@ EXPORT_SYMBOL_GPL(usb_assign_descriptors);
void usb_free_all_descriptors(struct usb_function *f)
{
usb_free_descriptors(f->fs_descriptors);
+ f->fs_descriptors = NULL;
usb_free_descriptors(f->hs_descriptors);
+ f->hs_descriptors = NULL;
usb_free_descriptors(f->ss_descriptors);
+ f->ss_descriptors = NULL;
+ usb_free_descriptors(f->ssp_descriptors);
+ f->ssp_descriptors = NULL;
}
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);
generated by cgit (git 2.34.1) at 2025-12-25 09:07:17 +0000