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1894 lines (1628 loc) · 51.3 KB
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/*******************************************************
HIDAPI - Multi-Platform library for
communication with HID devices.
Alan Ott
Signal 11 Software
8/22/2009
Linux Version - 6/2/2010
Libusb Version - 8/13/2010
FreeBSD Version - 11/1/2011
Copyright 2009, All Rights Reserved.
At the discretion of the user of this library,
this software may be licensed under the terms of the
GNU General Public License v3, a BSD-Style license, or the
original HIDAPI license as outlined in the LICENSE.txt,
LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
files located at the root of the source distribution.
These files may also be found in the public source
code repository located at:
https://github.com/libusb/hidapi .
********************************************************/
/* This file is heavily modified from the original libusb.c, for portability.
* Last upstream update was from July 25, 2019, Git commit 93dca807.
*/
#include "../../SDL_internal.h"
#include "../../thread/SDL_systhread.h"
#include "SDL_hints.h"
#include "SDL_mutex.h"
#include "SDL_thread.h"
#ifdef realloc
#undef realloc
#endif
#define realloc SDL_realloc
#ifdef snprintf
#undef snprintf
#endif
#define snprintf SDL_snprintf
#ifdef strdup
#undef strdup
#endif
#define strdup SDL_strdup
#ifdef strncpy
#undef strncpy
#endif
#define strncpy SDL_strlcpy
#ifdef tolower
#undef tolower
#endif
#define tolower SDL_tolower
#ifdef wcsncpy
#undef wcsncpy
#endif
#define wcsncpy SDL_wcslcpy
#ifndef HAVE_WCSDUP
#ifdef HAVE__WCSDUP
#define wcsdup _wcsdup
#else
#define wcsdup _dupwcs
static wchar_t *_dupwcs(const wchar_t *src)
{
wchar_t *dst = NULL;
if (src) {
size_t len = SDL_wcslen(src) + 1;
len *= sizeof(wchar_t);
dst = (wchar_t *) malloc(len);
if (dst) memcpy(dst, src, len);
}
return dst;
}
#endif
#endif /* HAVE_WCSDUP */
#include <libusb.h>
#ifndef _WIN32
#define HAVE_SETLOCALE
#include <locale.h> /* setlocale */
#endif
#include "../hidapi/hidapi.h"
#ifdef NAMESPACE
namespace NAMESPACE
{
#endif
/* Barrier implementation because Android/Bionic don't have pthread_barrier.
This implementation came from Brent Priddy and was posted on
StackOverflow. It is used with his permission. */
typedef struct _SDL_ThreadBarrier
{
SDL_mutex *mutex;
SDL_cond *cond;
Uint32 count;
Uint32 trip_count;
} SDL_ThreadBarrier;
static int SDL_CreateThreadBarrier(SDL_ThreadBarrier *barrier, Uint32 count)
{
SDL_assert(barrier != NULL);
SDL_assert(count != 0);
barrier->mutex = SDL_CreateMutex();
if (barrier->mutex == NULL) {
return -1; /* Error set by CreateMutex */
}
barrier->cond = SDL_CreateCond();
if (barrier->cond == NULL) {
return -1; /* Error set by CreateCond */
}
barrier->trip_count = count;
barrier->count = 0;
return 0;
}
static void SDL_DestroyThreadBarrier(SDL_ThreadBarrier *barrier)
{
SDL_DestroyCond(barrier->cond);
SDL_DestroyMutex(barrier->mutex);
}
static int SDL_WaitThreadBarrier(SDL_ThreadBarrier *barrier)
{
SDL_LockMutex(barrier->mutex);
barrier->count += 1;
if (barrier->count >= barrier->trip_count) {
barrier->count = 0;
SDL_CondBroadcast(barrier->cond);
SDL_UnlockMutex(barrier->mutex);
return 1;
}
SDL_CondWait(barrier->cond, barrier->mutex);
SDL_UnlockMutex(barrier->mutex);
return 0;
}
#if defined(__cplusplus) && !defined(NAMESPACE)
extern "C" {
#endif
#ifdef DEBUG_PRINTF
#define LOG(...) fprintf(stderr, __VA_ARGS__)
#else
#define LOG(...) do {} while (0)
#endif
#ifndef __FreeBSD__
#define DETACH_KERNEL_DRIVER
#endif
/* Uncomment to enable the retrieval of Usage and Usage Page in
hid_enumerate(). Warning, on platforms different from FreeBSD
this is very invasive as it requires the detach
and re-attach of the kernel driver. See comments inside hid_enumerate().
libusb HIDAPI programs are encouraged to use the interface number
instead to differentiate between interfaces on a composite HID device. */
/*#define INVASIVE_GET_USAGE*/
/* Linked List of input reports received from the device. */
struct input_report {
uint8_t *data;
size_t len;
struct input_report *next;
};
struct hid_device_ {
/* Handle to the actual device. */
libusb_device_handle *device_handle;
/* Endpoint information */
int input_endpoint;
int output_endpoint;
int input_ep_max_packet_size;
/* The interface number of the HID */
int interface;
int detached_driver;
/* Indexes of Strings */
int manufacturer_index;
int product_index;
int serial_index;
/* Whether blocking reads are used */
int blocking; /* boolean */
/* Read thread objects */
SDL_Thread *thread;
SDL_mutex *mutex; /* Protects input_reports */
SDL_cond *condition;
SDL_ThreadBarrier barrier; /* Ensures correct startup sequence */
int shutdown_thread;
int transfer_loop_finished;
struct libusb_transfer *transfer;
/* Quirks */
int skip_output_report_id;
int no_output_reports_on_intr_ep;
/* List of received input reports. */
struct input_report *input_reports;
};
static libusb_context *usb_context = NULL;
uint16_t get_usb_code_for_current_locale(void);
static int return_data(hid_device *dev, unsigned char *data, size_t length);
static hid_device *new_hid_device(void)
{
hid_device *dev = (hid_device*) calloc(1, sizeof(hid_device));
dev->blocking = 1;
dev->mutex = SDL_CreateMutex();
dev->condition = SDL_CreateCond();
SDL_CreateThreadBarrier(&dev->barrier, 2);
return dev;
}
static void free_hid_device(hid_device *dev)
{
/* Clean up the thread objects */
SDL_DestroyThreadBarrier(&dev->barrier);
SDL_DestroyCond(dev->condition);
SDL_DestroyMutex(dev->mutex);
/* Free the device itself */
free(dev);
}
#if 0
/*TODO: Implement this function on hidapi/libusb.. */
static void register_error(hid_device *dev, const char *op)
{
}
#endif
#ifdef INVASIVE_GET_USAGE
/* Get bytes from a HID Report Descriptor.
Only call with a num_bytes of 0, 1, 2, or 4. */
static uint32_t get_bytes(uint8_t *rpt, size_t len, size_t num_bytes, size_t cur)
{
/* Return if there aren't enough bytes. */
if (cur + num_bytes >= len)
return 0;
if (num_bytes == 0)
return 0;
else if (num_bytes == 1) {
return rpt[cur+1];
}
else if (num_bytes == 2) {
return (rpt[cur+2] * 256 + rpt[cur+1]);
}
else if (num_bytes == 4) {
return (rpt[cur+4] * 0x01000000 +
rpt[cur+3] * 0x00010000 +
rpt[cur+2] * 0x00000100 +
rpt[cur+1] * 0x00000001);
}
else
return 0;
}
/* Retrieves the device's Usage Page and Usage from the report
descriptor. The algorithm is simple, as it just returns the first
Usage and Usage Page that it finds in the descriptor.
The return value is 0 on success and -1 on failure. */
static int get_usage(uint8_t *report_descriptor, size_t size,
unsigned short *usage_page, unsigned short *usage)
{
unsigned int i = 0;
int size_code;
int data_len, key_size;
int usage_found = 0, usage_page_found = 0;
while (i < size) {
int key = report_descriptor[i];
int key_cmd = key & 0xfc;
//printf("key: %02hhx\n", key);
if ((key & 0xf0) == 0xf0) {
/* This is a Long Item. The next byte contains the
length of the data section (value) for this key.
See the HID specification, version 1.11, section
6.2.2.3, titled "Long Items." */
if (i+1 < size)
data_len = report_descriptor[i+1];
else
data_len = 0; /* malformed report */
key_size = 3;
}
else {
/* This is a Short Item. The bottom two bits of the
key contain the size code for the data section
(value) for this key. Refer to the HID
specification, version 1.11, section 6.2.2.2,
titled "Short Items." */
size_code = key & 0x3;
switch (size_code) {
case 0:
case 1:
case 2:
data_len = size_code;
break;
case 3:
data_len = 4;
break;
default:
/* Can't ever happen since size_code is & 0x3 */
data_len = 0;
break;
}
key_size = 1;
}
if (key_cmd == 0x4) {
*usage_page = get_bytes(report_descriptor, size, data_len, i);
usage_page_found = 1;
//printf("Usage Page: %x\n", (uint32_t)*usage_page);
}
if (key_cmd == 0x8) {
*usage = get_bytes(report_descriptor, size, data_len, i);
usage_found = 1;
//printf("Usage: %x\n", (uint32_t)*usage);
}
if (usage_page_found && usage_found)
return 0; /* success */
/* Skip over this key and it's associated data */
i += data_len + key_size;
}
return -1; /* failure */
}
#endif /* INVASIVE_GET_USAGE */
#if defined(__FreeBSD__) && __FreeBSD__ < 10
/* The libusb version included in FreeBSD < 10 doesn't have this function. In
mainline libusb, it's inlined in libusb.h. This function will bear a striking
resemblance to that one, because there's about one way to code it.
Note that the data parameter is Unicode in UTF-16LE encoding.
Return value is the number of bytes in data, or LIBUSB_ERROR_*.
*/
static inline int libusb_get_string_descriptor(libusb_device_handle *dev,
uint8_t descriptor_index, uint16_t lang_id,
unsigned char *data, int length)
{
return libusb_control_transfer(dev,
LIBUSB_ENDPOINT_IN | 0x0, /* Endpoint 0 IN */
LIBUSB_REQUEST_GET_DESCRIPTOR,
(LIBUSB_DT_STRING << 8) | descriptor_index,
lang_id, data, (uint16_t) length, 1000);
}
#endif
/* Get the first language the device says it reports. This comes from
USB string #0. */
static uint16_t get_first_language(libusb_device_handle *dev)
{
uint16_t buf[32];
int len;
/* Get the string from libusb. */
len = libusb_get_string_descriptor(dev,
0x0, /* String ID */
0x0, /* Language */
(unsigned char*)buf,
sizeof(buf));
if (len < 4)
return 0x0;
return buf[1]; /* First two bytes are len and descriptor type. */
}
static int is_language_supported(libusb_device_handle *dev, uint16_t lang)
{
uint16_t buf[32];
int len;
int i;
/* Get the string from libusb. */
len = libusb_get_string_descriptor(dev,
0x0, /* String ID */
0x0, /* Language */
(unsigned char*)buf,
sizeof(buf));
if (len < 4)
return 0x0;
len /= 2; /* language IDs are two-bytes each. */
/* Start at index 1 because there are two bytes of protocol data. */
for (i = 1; i < len; i++) {
if (buf[i] == lang)
return 1;
}
return 0;
}
/* This function returns a newly allocated wide string containing the USB
device string numbered by the index. The returned string must be freed
by using free(). */
#if defined(__OS2__) /* don't use iconv on OS/2: no support for wchar_t. */
#define NO_ICONV
#endif
static wchar_t *get_usb_string(libusb_device_handle *dev, uint8_t idx)
{
char buf[512];
int len;
wchar_t *str = NULL;
#if !defined(NO_ICONV)
wchar_t wbuf[256];
SDL_iconv_t ic;
size_t inbytes;
size_t outbytes;
size_t res;
const char *inptr;
char *outptr;
#else
int i;
#endif
/* Determine which language to use. */
uint16_t lang;
lang = get_usb_code_for_current_locale();
if (!is_language_supported(dev, lang))
lang = get_first_language(dev);
/* Get the string from libusb. */
len = libusb_get_string_descriptor(dev,
idx,
lang,
(unsigned char*)buf,
sizeof(buf));
if (len < 0)
return NULL;
#if defined(NO_ICONV) /* original hidapi code for NO_ICONV : */
/* Bionic does not have wchar_t iconv support, so it
has to be done manually. The following code will only work for
code points that can be represented as a single UTF-16 character,
and will incorrectly convert any code points which require more
than one UTF-16 character.
Skip over the first character (2-bytes). */
len -= 2;
str = (wchar_t*) malloc((len / 2 + 1) * sizeof(wchar_t));
for (i = 0; i < len / 2; i++) {
str[i] = buf[i * 2 + 2] | (buf[i * 2 + 3] << 8);
}
str[len / 2] = 0x00000000;
#else
/* buf does not need to be explicitly NULL-terminated because
it is only passed into iconv() which does not need it. */
/* Initialize iconv. */
ic = SDL_iconv_open("WCHAR_T", "UTF-16LE");
if (ic == (SDL_iconv_t)-1) {
LOG("SDL_iconv_open() failed\n");
return NULL;
}
/* Convert to native wchar_t (UTF-32 on glibc/BSD systems).
Skip the first character (2-bytes). */
inptr = buf+2;
inbytes = len-2;
outptr = (char*) wbuf;
outbytes = sizeof(wbuf);
res = SDL_iconv(ic, &inptr, &inbytes, &outptr, &outbytes);
if (res == (size_t)-1) {
LOG("SDL_iconv() failed\n");
goto err;
}
/* Write the terminating NULL. */
wbuf[sizeof(wbuf)/sizeof(wbuf[0])-1] = 0x00000000;
if (outbytes >= sizeof(wbuf[0]))
*((wchar_t*)outptr) = 0x00000000;
/* Allocate and copy the string. */
str = wcsdup(wbuf);
err:
SDL_iconv_close(ic);
#endif
return str;
}
struct usb_string_cache_entry {
uint16_t vid;
uint16_t pid;
wchar_t *vendor;
wchar_t *product;
};
static struct usb_string_cache_entry *usb_string_cache = NULL;
static size_t usb_string_cache_size = 0;
static size_t usb_string_cache_insert_pos = 0;
static int usb_string_cache_grow()
{
struct usb_string_cache_entry *new_cache;
size_t allocSize;
size_t new_cache_size;
new_cache_size = usb_string_cache_size + 8;
allocSize = sizeof(struct usb_string_cache_entry) * new_cache_size;
new_cache = (struct usb_string_cache_entry *)realloc(usb_string_cache, allocSize);
if (!new_cache)
return -1;
usb_string_cache = new_cache;
usb_string_cache_size = new_cache_size;
return 0;
}
static void usb_string_cache_destroy()
{
size_t i;
for (i = 0; i < usb_string_cache_insert_pos; i++) {
free(usb_string_cache[i].vendor);
free(usb_string_cache[i].product);
}
free(usb_string_cache);
usb_string_cache = NULL;
usb_string_cache_size = 0;
usb_string_cache_insert_pos = 0;
}
static struct usb_string_cache_entry *usb_string_cache_insert()
{
struct usb_string_cache_entry *new_entry = NULL;
if (usb_string_cache_insert_pos >= usb_string_cache_size) {
if (usb_string_cache_grow() < 0)
return NULL;
}
new_entry = &usb_string_cache[usb_string_cache_insert_pos];
usb_string_cache_insert_pos++;
return new_entry;
}
static int usb_string_can_cache(uint16_t vid, uint16_t pid)
{
if (!vid || !pid) {
/* We can't cache these, they aren't unique */
return 0;
}
if (vid == 0x0f0d && pid == 0x00dc) {
/* HORI reuses this VID/PID for many different products */
return 0;
}
/* We can cache these strings */
return 1;
}
static const struct usb_string_cache_entry *usb_string_cache_find(struct libusb_device_descriptor *desc, struct libusb_device_handle *handle)
{
struct usb_string_cache_entry *entry = NULL;
size_t i;
/* Search for existing string cache entry */
for (i = 0; i < usb_string_cache_insert_pos; i++) {
entry = &usb_string_cache[i];
if (entry->vid != desc->idVendor)
continue;
if (entry->pid != desc->idProduct)
continue;
return entry;
}
/* Not found, create one. */
entry = usb_string_cache_insert();
if (!entry)
return NULL;
entry->vid = desc->idVendor;
entry->pid = desc->idProduct;
if (desc->iManufacturer > 0)
entry->vendor = get_usb_string(handle, desc->iManufacturer);
else
entry->vendor = NULL;
if (desc->iProduct > 0)
entry->product = get_usb_string(handle, desc->iProduct);
else
entry->product = NULL;
return entry;
}
static char *make_path(libusb_device *dev, int interface_number)
{
char str[64];
snprintf(str, sizeof(str), "%04x:%04x:%02x",
libusb_get_bus_number(dev),
libusb_get_device_address(dev),
interface_number);
str[sizeof(str)-1] = '\0';
return strdup(str);
}
int HID_API_EXPORT hid_init(void)
{
if (!usb_context) {
/* Init Libusb */
if (libusb_init(&usb_context))
return -1;
#ifdef HAVE_SETLOCALE
/* Set the locale if it's not set. */
{
const char *locale = setlocale(LC_CTYPE, NULL);
if (!locale)
setlocale(LC_CTYPE, "");
}
#endif
}
return 0;
}
int HID_API_EXPORT hid_exit(void)
{
usb_string_cache_destroy();
if (usb_context) {
libusb_exit(usb_context);
usb_context = NULL;
}
return 0;
}
static int is_xbox360(unsigned short vendor_id, const struct libusb_interface_descriptor *intf_desc)
{
static const int XB360_IFACE_SUBCLASS = 93;
static const int XB360_IFACE_PROTOCOL = 1; /* Wired */
static const int XB360W_IFACE_PROTOCOL = 129; /* Wireless */
static const int SUPPORTED_VENDORS[] = {
0x0079, /* GPD Win 2 */
0x044f, /* Thrustmaster */
0x045e, /* Microsoft */
0x046d, /* Logitech */
0x056e, /* Elecom */
0x06a3, /* Saitek */
0x0738, /* Mad Catz */
0x07ff, /* Mad Catz */
0x0e6f, /* PDP */
0x0f0d, /* Hori */
0x1038, /* SteelSeries */
0x11c9, /* Nacon */
0x12ab, /* Unknown */
0x1430, /* RedOctane */
0x146b, /* BigBen */
0x1532, /* Razer Sabertooth */
0x15e4, /* Numark */
0x162e, /* Joytech */
0x1689, /* Razer Onza */
0x1949, /* Lab126, Inc. */
0x1bad, /* Harmonix */
0x20d6, /* PowerA */
0x24c6, /* PowerA */
0x2c22, /* Qanba */
0x2dc8, /* 8BitDo */
0x9886, /* ASTRO Gaming */
};
if (intf_desc->bInterfaceClass == LIBUSB_CLASS_VENDOR_SPEC &&
intf_desc->bInterfaceSubClass == XB360_IFACE_SUBCLASS &&
(intf_desc->bInterfaceProtocol == XB360_IFACE_PROTOCOL ||
intf_desc->bInterfaceProtocol == XB360W_IFACE_PROTOCOL)) {
int i;
for (i = 0; i < sizeof(SUPPORTED_VENDORS)/sizeof(SUPPORTED_VENDORS[0]); ++i) {
if (vendor_id == SUPPORTED_VENDORS[i]) {
return 1;
}
}
}
return 0;
}
static int is_xboxone(unsigned short vendor_id, const struct libusb_interface_descriptor *intf_desc)
{
static const int XB1_IFACE_SUBCLASS = 71;
static const int XB1_IFACE_PROTOCOL = 208;
static const int SUPPORTED_VENDORS[] = {
0x03f0, /* HP */
0x044f, /* Thrustmaster */
0x045e, /* Microsoft */
0x0738, /* Mad Catz */
0x0e6f, /* PDP */
0x0f0d, /* Hori */
0x10f5, /* Turtle Beach */
0x1532, /* Razer Wildcat */
0x20d6, /* PowerA */
0x24c6, /* PowerA */
0x2dc8, /* 8BitDo */
0x2e24, /* Hyperkin */
0x3537, /* GameSir */
};
if (intf_desc->bInterfaceNumber == 0 &&
intf_desc->bInterfaceClass == LIBUSB_CLASS_VENDOR_SPEC &&
intf_desc->bInterfaceSubClass == XB1_IFACE_SUBCLASS &&
intf_desc->bInterfaceProtocol == XB1_IFACE_PROTOCOL) {
int i;
for (i = 0; i < sizeof(SUPPORTED_VENDORS)/sizeof(SUPPORTED_VENDORS[0]); ++i) {
if (vendor_id == SUPPORTED_VENDORS[i]) {
return 1;
}
}
}
return 0;
}
static int should_enumerate_interface(unsigned short vendor_id, const struct libusb_interface_descriptor *intf_desc)
{
//printf("Checking interface 0x%x %d/%d/%d/%d\n", vendor_id, intf_desc->bInterfaceNumber, intf_desc->bInterfaceClass, intf_desc->bInterfaceSubClass, intf_desc->bInterfaceProtocol);
if (intf_desc->bInterfaceClass == LIBUSB_CLASS_HID)
return 1;
/* Also enumerate Xbox 360 controllers */
if (is_xbox360(vendor_id, intf_desc))
return 1;
/* Also enumerate Xbox One controllers */
if (is_xboxone(vendor_id, intf_desc))
return 1;
return 0;
}
struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
libusb_device **devs;
libusb_device *dev;
libusb_device_handle *handle;
ssize_t num_devs;
int i = 0;
struct hid_device_info *root = NULL; /* return object */
struct hid_device_info *cur_dev = NULL;
const char *hint = SDL_GetHint(SDL_HINT_HIDAPI_IGNORE_DEVICES);
if(hid_init() < 0)
return NULL;
num_devs = libusb_get_device_list(usb_context, &devs);
if (num_devs < 0)
return NULL;
while ((dev = devs[i++]) != NULL) {
struct libusb_device_descriptor desc;
struct libusb_config_descriptor *conf_desc = NULL;
int j, k;
int interface_num = 0;
int res = libusb_get_device_descriptor(dev, &desc);
unsigned short dev_vid = desc.idVendor;
unsigned short dev_pid = desc.idProduct;
/* See if there are any devices we should skip in enumeration */
if (hint) {
char vendor_match[16], product_match[16];
SDL_snprintf(vendor_match, sizeof(vendor_match), "0x%.4x/0x0000", dev_vid);
SDL_snprintf(product_match, sizeof(product_match), "0x%.4x/0x%.4x", dev_vid, dev_pid);
if (SDL_strcasestr(hint, vendor_match) || SDL_strcasestr(hint, product_match)) {
continue;
}
}
res = libusb_get_active_config_descriptor(dev, &conf_desc);
if (res < 0)
libusb_get_config_descriptor(dev, 0, &conf_desc);
if (conf_desc) {
for (j = 0; j < conf_desc->bNumInterfaces; j++) {
const struct libusb_interface *intf = &conf_desc->interface[j];
for (k = 0; k < intf->num_altsetting; k++) {
const struct libusb_interface_descriptor *intf_desc;
intf_desc = &intf->altsetting[k];
if (should_enumerate_interface(dev_vid, intf_desc)) {
interface_num = intf_desc->bInterfaceNumber;
/* Check the VID/PID against the arguments */
if ((vendor_id == 0x0 || vendor_id == dev_vid) &&
(product_id == 0x0 || product_id == dev_pid)) {
res = libusb_open(dev, &handle);
if (res >= 0) {
struct hid_device_info *tmp;
const struct usb_string_cache_entry *string_cache;
/* VID/PID match. Create the record. */
tmp = (struct hid_device_info*) calloc(1, sizeof(struct hid_device_info));
if (cur_dev) {
cur_dev->next = tmp;
}
else {
root = tmp;
}
cur_dev = tmp;
/* Fill out the record */
cur_dev->next = NULL;
cur_dev->path = make_path(dev, interface_num);
/* Serial Number */
if (desc.iSerialNumber > 0)
cur_dev->serial_number =
get_usb_string(handle, desc.iSerialNumber);
/* Manufacturer and Product strings */
if (usb_string_can_cache(dev_vid, dev_pid)) {
string_cache = usb_string_cache_find(&desc, handle);
if (string_cache) {
if (string_cache->vendor) {
cur_dev->manufacturer_string = wcsdup(string_cache->vendor);
}
if (string_cache->product) {
cur_dev->product_string = wcsdup(string_cache->product);
}
}
} else {
if (desc.iManufacturer > 0)
cur_dev->manufacturer_string =
get_usb_string(handle, desc.iManufacturer);
if (desc.iProduct > 0)
cur_dev->product_string =
get_usb_string(handle, desc.iProduct);
}
#ifdef INVASIVE_GET_USAGE
{
/*
This section is removed because it is too
invasive on the system. Getting a Usage Page
and Usage requires parsing the HID Report
descriptor. Getting a HID Report descriptor
involves claiming the interface. Claiming the
interface involves detaching the kernel driver.
Detaching the kernel driver is hard on the system
because it will unclaim interfaces (if another
app has them claimed) and the re-attachment of
the driver will sometimes change /dev entry names.
It is for these reasons that this section is
#if 0. For composite devices, use the interface
field in the hid_device_info struct to distinguish
between interfaces. */
unsigned char data[256];
#ifdef DETACH_KERNEL_DRIVER
int detached = 0;
/* Usage Page and Usage */
res = libusb_kernel_driver_active(handle, interface_num);
if (res == 1) {
res = libusb_detach_kernel_driver(handle, interface_num);
if (res < 0)
LOG("Couldn't detach kernel driver, even though a kernel driver was attached.");
else
detached = 1;
}
#endif
res = libusb_claim_interface(handle, interface_num);
if (res >= 0) {
/* Get the HID Report Descriptor. */
res = libusb_control_transfer(handle, LIBUSB_ENDPOINT_IN|LIBUSB_RECIPIENT_INTERFACE, LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_REPORT << 8)|interface_num, 0, data, sizeof(data), 5000);
if (res >= 0) {
unsigned short page=0, usage=0;
/* Parse the usage and usage page
out of the report descriptor. */
get_usage(data, res, &page, &usage);
cur_dev->usage_page = page;
cur_dev->usage = usage;
}
else
LOG("libusb_control_transfer() for getting the HID report failed with %d\n", res);
/* Release the interface */
res = libusb_release_interface(handle, interface_num);
if (res < 0)
LOG("Can't release the interface.\n");
}
else
LOG("Can't claim interface %d\n", res);
#ifdef DETACH_KERNEL_DRIVER
/* Re-attach kernel driver if necessary. */
if (detached) {
res = libusb_attach_kernel_driver(handle, interface_num);
if (res < 0)
LOG("Couldn't re-attach kernel driver.\n");
}
#endif
}
#endif /* INVASIVE_GET_USAGE */
libusb_close(handle);
/* VID/PID */
cur_dev->vendor_id = dev_vid;
cur_dev->product_id = dev_pid;
/* Release Number */
cur_dev->release_number = desc.bcdDevice;
/* Interface Number */
cur_dev->interface_number = interface_num;
cur_dev->interface_class = intf_desc->bInterfaceClass;
cur_dev->interface_subclass = intf_desc->bInterfaceSubClass;
cur_dev->interface_protocol = intf_desc->bInterfaceProtocol;
} else
LOG("Can't open device 0x%.4x/0x%.4x during enumeration: %d\n", dev_vid, dev_pid, res);
}
}
} /* altsettings */
} /* interfaces */
libusb_free_config_descriptor(conf_desc);
}
}
libusb_free_device_list(devs, 1);
return root;
}
void HID_API_EXPORT hid_free_enumeration(struct hid_device_info *devs)
{
struct hid_device_info *d = devs;
while (d) {
struct hid_device_info *next = d->next;
free(d->path);
free(d->serial_number);
free(d->manufacturer_string);
free(d->product_string);
free(d);
d = next;
}
}
hid_device * hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number)
{
struct hid_device_info *devs, *cur_dev;
const char *path_to_open = NULL;
hid_device *handle = NULL;
devs = hid_enumerate(vendor_id, product_id);
cur_dev = devs;
while (cur_dev) {
if (cur_dev->vendor_id == vendor_id &&
cur_dev->product_id == product_id) {
if (serial_number) {
if (cur_dev->serial_number &&
wcscmp(serial_number, cur_dev->serial_number) == 0) {
path_to_open = cur_dev->path;
break;
}
}
else {
path_to_open = cur_dev->path;
break;
}
}
cur_dev = cur_dev->next;
}
if (path_to_open) {
/* Open the device */
handle = hid_open_path(path_to_open, 0);
}
hid_free_enumeration(devs);
return handle;