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libusb(3): Expose device caps as libusb_bos_descriptor::dev_capability

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Some libusb consumers in Linux-land (in this case, libusb4java) expect a
dev_capability member that they can use to enumerate the device
capabilities.

No particular layout is expected of this, just that it can be traversed
using the bLength member until bNumDeviceCapabilities are read and that the
consumer may then use one of the libusb_get_*_descriptor methods to extract
specific (usb 2.0 vs. ss) capability information.

In collaboration with:	hselasky
Reviewed by:	hselasky
Approved by:	emaste (mentor)
Differential Revision:	https://reviews.freebsd.org/D11494
This commit is contained in:
Kyle Evans 2017-08-09 18:06:27 +00:00
parent ef3266d58a
commit f75f5a355e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322322
2 changed files with 27 additions and 2 deletions
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1
lib/libusb/libusb.h
View File

@ -388,6 +388,7 @@ typedef struct libusb_bos_descriptor {
uint8_t bNumDeviceCapabilities;
struct libusb_usb_2_0_device_capability_descriptor *usb_2_0_ext_cap;
struct libusb_ss_usb_device_capability_descriptor *ss_usb_cap;
struct libusb_bos_dev_capability_descriptor **dev_capability;
} libusb_bos_descriptor __aligned(sizeof(void *));
typedef struct libusb_usb_2_0_extension_descriptor {

28
lib/libusb/libusb10_desc.c
View File

@ -433,6 +433,7 @@ libusb_parse_bos_descriptor(const void *buf, int len,
struct libusb_bos_descriptor *ptr;
struct libusb_usb_2_0_device_capability_descriptor *dcap_20 = NULL;
struct libusb_ss_usb_device_capability_descriptor *ss_cap = NULL;
uint8_t index = 0;
if (buf == NULL || bos == NULL || len < 1)
return (LIBUSB_ERROR_INVALID_PARAM);
@ -453,7 +454,8 @@ libusb_parse_bos_descriptor(const void *buf, int len,
break;
if (dlen >= LIBUSB_DT_BOS_SIZE &&
dtype == LIBUSB_DT_BOS) {
dtype == LIBUSB_DT_BOS &&
ptr == NULL) {
ptr = malloc(sizeof(*ptr) + sizeof(*dcap_20) +
sizeof(*ss_cap));
@ -470,6 +472,11 @@ libusb_parse_bos_descriptor(const void *buf, int len,
ptr->bNumDeviceCapabilities = ((const uint8_t *)buf)[4];
ptr->usb_2_0_ext_cap = NULL;
ptr->ss_usb_cap = NULL;
ptr->dev_capability = calloc(ptr->bNumDeviceCapabilities, sizeof(void *));
if (ptr->dev_capability == NULL) {
free(ptr);
return (LIBUSB_ERROR_NO_MEM);
}
dcap_20 = (void *)(ptr + 1);
ss_cap = (void *)(dcap_20 + 1);
@ -477,6 +484,15 @@ libusb_parse_bos_descriptor(const void *buf, int len,
if (dlen >= 3 &&
ptr != NULL &&
dtype == LIBUSB_DT_DEVICE_CAPABILITY) {
if (index != ptr->bNumDeviceCapabilities) {
ptr->dev_capability[index] = malloc(dlen);
if (ptr->dev_capability[index] == NULL) {
libusb_free_bos_descriptor(ptr);
return LIBUSB_ERROR_NO_MEM;
}
memcpy(ptr->dev_capability[index], buf, dlen);
index++;
}
switch (((const uint8_t *)buf)[2]) {
case LIBUSB_USB_2_0_EXTENSION_DEVICE_CAPABILITY:
if (ptr->usb_2_0_ext_cap != NULL || dcap_20 == NULL)
@ -523,8 +539,11 @@ libusb_parse_bos_descriptor(const void *buf, int len,
buf = ((const uint8_t *)buf) + dlen;
len -= dlen;
}
if (ptr != NULL)
if (ptr != NULL) {
ptr->bNumDeviceCapabilities = index;
return (0); /* success */
}
return (LIBUSB_ERROR_IO);
}
@ -532,9 +551,14 @@ libusb_parse_bos_descriptor(const void *buf, int len,
void
libusb_free_bos_descriptor(struct libusb_bos_descriptor *bos)
{
uint8_t i;
if (bos == NULL)
return;
for (i = 0; i != bos->bNumDeviceCapabilities; i++)
free(bos->dev_capability[i]);
free(bos->dev_capability);
free(bos);
}