linux/drivers/usb/core/config.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Released under the GPLv2 only.
 */

#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/hcd.h>
#include <linux/usb/quirks.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <asm/byteorder.h>
#include "usb.h"


#define USB_MAXALTSETTING …

#define USB_MAXCONFIG …


static inline const char *plural(int n)
{ … }

static int find_next_descriptor(unsigned char *buffer, int size,
    int dt1, int dt2, int *num_skipped)
{ … }

static void usb_parse_ssp_isoc_endpoint_companion(struct device *ddev,
		int cfgno, int inum, int asnum, struct usb_host_endpoint *ep,
		unsigned char *buffer, int size)
{ … }

static void usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
		int inum, int asnum, struct usb_host_endpoint *ep,
		unsigned char *buffer, int size)
{ … }

static const unsigned short low_speed_maxpacket_maxes[4] = …;
static const unsigned short full_speed_maxpacket_maxes[4] = …;
static const unsigned short high_speed_maxpacket_maxes[4] = …;
static const unsigned short super_speed_maxpacket_maxes[4] = …;

static bool endpoint_is_duplicate(struct usb_endpoint_descriptor *e1,
		struct usb_endpoint_descriptor *e2)
{ … }

/*
 * Check for duplicate endpoint addresses in other interfaces and in the
 * altsetting currently being parsed.
 */
static bool config_endpoint_is_duplicate(struct usb_host_config *config,
		int inum, int asnum, struct usb_endpoint_descriptor *d)
{ … }

static int usb_parse_endpoint(struct device *ddev, int cfgno,
		struct usb_host_config *config, int inum, int asnum,
		struct usb_host_interface *ifp, int num_ep,
		unsigned char *buffer, int size)
{ … }

void usb_release_interface_cache(struct kref *ref)
{ … }

static int usb_parse_interface(struct device *ddev, int cfgno,
    struct usb_host_config *config, unsigned char *buffer, int size,
    u8 inums[], u8 nalts[])
{ … }

static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
    struct usb_host_config *config, unsigned char *buffer, int size)
{ … }

/* hub-only!! ... and only exported for reset/reinit path.
 * otherwise used internally on disconnect/destroy path
 */
void usb_destroy_configuration(struct usb_device *dev)
{ … }


/*
 * Get the USB config descriptors, cache and parse'em
 *
 * hub-only!! ... and only in reset path, or usb_new_device()
 * (used by real hubs and virtual root hubs)
 */
int usb_get_configuration(struct usb_device *dev)
{ … }

void usb_release_bos_descriptor(struct usb_device *dev)
{ … }

static const __u8 bos_desc_len[256] = …;

/* Get BOS descriptor set */
int usb_get_bos_descriptor(struct usb_device *dev)
{ … }