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hid.c
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hid.c
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/*******************************************************
HIDAPI - Multi-Platform library for
communication with HID devices.
Alan Ott
Signal 11 Software
2010-07-03
Copyright 2010, All Rights Reserved.
At the discretion of the user of this library,
this software may be licensed under the terms of the
GNU 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 .
********************************************************/
#include "../../SDL_internal.h"
#include "SDL_hints.h"
/* See Apple Technical Note TN2187 for details on IOHidManager. */
#include <IOKit/hid/IOHIDManager.h>
#include <IOKit/hid/IOHIDKeys.h>
#include <CoreFoundation/CoreFoundation.h>
#include <wchar.h>
#include <pthread.h>
#include <sys/time.h>
#include <unistd.h>
#include "../hidapi/hidapi.h"
#define VALVE_USB_VID 0x28DE
/* Barrier implementation because Mac OSX doesn't have pthread_barrier.
It also doesn't have clock_gettime(). So much for POSIX and SUSv2.
This implementation came from Brent Priddy and was posted on
StackOverflow. It is used with his permission. */
typedef int pthread_barrierattr_t;
typedef struct pthread_barrier {
pthread_mutex_t mutex;
pthread_cond_t cond;
int count;
int trip_count;
} pthread_barrier_t;
static int pthread_barrier_init(pthread_barrier_t *barrier, const pthread_barrierattr_t *attr, unsigned int count)
{
if(count == 0) {
errno = EINVAL;
return -1;
}
if(pthread_mutex_init(&barrier->mutex, 0) < 0) {
return -1;
}
if(pthread_cond_init(&barrier->cond, 0) < 0) {
pthread_mutex_destroy(&barrier->mutex);
return -1;
}
barrier->trip_count = count;
barrier->count = 0;
return 0;
}
static int pthread_barrier_destroy(pthread_barrier_t *barrier)
{
pthread_cond_destroy(&barrier->cond);
pthread_mutex_destroy(&barrier->mutex);
return 0;
}
static int pthread_barrier_wait(pthread_barrier_t *barrier)
{
pthread_mutex_lock(&barrier->mutex);
++(barrier->count);
if(barrier->count >= barrier->trip_count)
{
barrier->count = 0;
pthread_cond_broadcast(&barrier->cond);
pthread_mutex_unlock(&barrier->mutex);
return 1;
}
else
{
pthread_cond_wait(&barrier->cond, &(barrier->mutex));
pthread_mutex_unlock(&barrier->mutex);
return 0;
}
}
static int return_data(hid_device *dev, unsigned char *data, size_t length);
/* 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_ {
IOHIDDeviceRef device_handle;
int blocking;
int uses_numbered_reports;
int disconnected;
CFStringRef run_loop_mode;
CFRunLoopRef run_loop;
CFRunLoopSourceRef source;
uint8_t *input_report_buf;
CFIndex max_input_report_len;
struct input_report *input_reports;
pthread_t thread;
pthread_mutex_t mutex; /* Protects input_reports */
pthread_cond_t condition;
pthread_barrier_t barrier; /* Ensures correct startup sequence */
pthread_barrier_t shutdown_barrier; /* Ensures correct shutdown sequence */
int shutdown_thread;
};
struct hid_device_list_node
{
struct hid_device_ *dev;
struct hid_device_list_node *next;
};
static IOHIDManagerRef hid_mgr = 0x0;
static struct hid_device_list_node *device_list = 0x0;
static hid_device *new_hid_device(void)
{
hid_device *dev = (hid_device*)calloc(1, sizeof(hid_device));
dev->device_handle = NULL;
dev->blocking = 1;
dev->uses_numbered_reports = 0;
dev->disconnected = 0;
dev->run_loop_mode = NULL;
dev->run_loop = NULL;
dev->source = NULL;
dev->input_report_buf = NULL;
dev->input_reports = NULL;
dev->shutdown_thread = 0;
/* Thread objects */
pthread_mutex_init(&dev->mutex, NULL);
pthread_cond_init(&dev->condition, NULL);
pthread_barrier_init(&dev->barrier, NULL, 2);
pthread_barrier_init(&dev->shutdown_barrier, NULL, 2);
return dev;
}
static void free_hid_device(hid_device *dev)
{
struct input_report *rpt;
if (!dev)
return;
/* Delete any input reports still left over. */
rpt = dev->input_reports;
while (rpt) {
struct input_report *next = rpt->next;
free(rpt->data);
free(rpt);
rpt = next;
}
/* Free the string and the report buffer. The check for NULL
is necessary here as CFRelease() doesn't handle NULL like
free() and others do. */
if (dev->run_loop_mode)
CFRelease(dev->run_loop_mode);
if (dev->source)
CFRelease(dev->source);
free(dev->input_report_buf);
if (device_list) {
if (device_list->dev == dev) {
device_list = device_list->next;
}
else {
struct hid_device_list_node *node = device_list;
while (node) {
if (node->next && node->next->dev == dev) {
struct hid_device_list_node *new_next = node->next->next;
free(node->next);
node->next = new_next;
break;
}
node = node->next;
}
}
}
/* Clean up the thread objects */
pthread_barrier_destroy(&dev->shutdown_barrier);
pthread_barrier_destroy(&dev->barrier);
pthread_cond_destroy(&dev->condition);
pthread_mutex_destroy(&dev->mutex);
/* Free the structure itself. */
free(dev);
}
#if 0
static void register_error(hid_device *device, const char *op)
{
}
#endif
static int32_t get_int_property(IOHIDDeviceRef device, CFStringRef key)
{
CFTypeRef ref;
int32_t value;
ref = IOHIDDeviceGetProperty(device, key);
if (ref) {
if (CFGetTypeID(ref) == CFNumberGetTypeID()) {
CFNumberGetValue((CFNumberRef) ref, kCFNumberSInt32Type, &value);
return value;
}
}
return 0;
}
static unsigned short get_vendor_id(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDVendorIDKey));
}
static unsigned short get_product_id(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDProductIDKey));
}
static int32_t get_max_report_length(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDMaxInputReportSizeKey));
}
static int get_string_property(IOHIDDeviceRef device, CFStringRef prop, wchar_t *buf, size_t len)
{
CFStringRef str;
if (!len)
return 0;
if (CFGetTypeID(prop) != CFStringGetTypeID())
return 0;
str = (CFStringRef)IOHIDDeviceGetProperty(device, prop);
buf[0] = 0;
if (str && CFGetTypeID(str) == CFStringGetTypeID()) {
CFIndex used_buf_len, chars_copied;
CFRange range;
CFIndex str_len = CFStringGetLength(str);
len --;
range.location = 0;
range.length = (str_len > len)? len: str_len;
chars_copied = CFStringGetBytes(str,
range,
kCFStringEncodingUTF32LE,
(char)'?',
FALSE,
(UInt8*)buf,
len,
&used_buf_len);
buf[chars_copied] = 0;
return (int)chars_copied;
}
else
return 0;
}
static int get_string_property_utf8(IOHIDDeviceRef device, CFStringRef prop, char *buf, size_t len)
{
CFStringRef str;
if (!len)
return 0;
if (CFGetTypeID(prop) != CFStringGetTypeID())
return 0;
str = (CFStringRef)IOHIDDeviceGetProperty(device, prop);
buf[0] = 0;
if (str && CFGetTypeID(str) == CFStringGetTypeID()) {
CFIndex used_buf_len, chars_copied;
CFRange range;
CFIndex str_len = CFStringGetLength(str);
len--;
range.location = 0;
range.length = (str_len > len)? len: str_len;
chars_copied = CFStringGetBytes(str,
range,
kCFStringEncodingUTF8,
(char)'?',
FALSE,
(UInt8*)buf,
len,
&used_buf_len);
buf[chars_copied] = 0;
return (int)used_buf_len;
}
else
return 0;
}
static int get_serial_number(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDSerialNumberKey), buf, len);
}
static int get_manufacturer_string(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDManufacturerKey), buf, len);
}
static int get_product_string(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDProductKey), buf, len);
}
/* Implementation of wcsdup() for Mac. */
static wchar_t *dup_wcs(const wchar_t *s)
{
size_t len = wcslen(s);
wchar_t *ret = (wchar_t *)malloc((len+1)*sizeof(wchar_t));
wcscpy(ret, s);
return ret;
}
static int make_path(IOHIDDeviceRef device, char *buf, size_t len)
{
int res;
unsigned short vid, pid;
char transport[32];
buf[0] = '\0';
res = get_string_property_utf8(
device, CFSTR(kIOHIDTransportKey),
transport, sizeof(transport));
if (!res)
return -1;
vid = get_vendor_id(device);
pid = get_product_id(device);
res = snprintf(buf, len, "%s_%04hx_%04hx_%p",
transport, vid, pid, device);
buf[len-1] = '\0';
return res+1;
}
static void hid_device_removal_callback(void *context, IOReturn result,
void *sender, IOHIDDeviceRef hid_ref)
{
// The device removal callback is sometimes called even after being
// unregistered, leading to a crash when trying to access fields in
// the already freed hid_device. We keep a linked list of all created
// hid_device's so that the one being removed can be checked against
// the list to see if it really hasn't been closed yet and needs to
// be dealt with here.
struct hid_device_list_node *node = device_list;
while (node) {
if (node->dev->device_handle == hid_ref) {
node->dev->disconnected = 1;
CFRunLoopStop(node->dev->run_loop);
break;
}
node = node->next;
}
}
static CFDictionaryRef
create_usage_match(const UInt32 page, const UInt32 usage, int *okay)
{
CFDictionaryRef retval = NULL;
CFNumberRef pageNumRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &page);
CFNumberRef usageNumRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &usage);
const void *keys[2] = { (void *) CFSTR(kIOHIDDeviceUsagePageKey), (void *) CFSTR(kIOHIDDeviceUsageKey) };
const void *vals[2] = { (void *) pageNumRef, (void *) usageNumRef };
if (pageNumRef && usageNumRef) {
retval = CFDictionaryCreate(kCFAllocatorDefault, keys, vals, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
}
if (pageNumRef) {
CFRelease(pageNumRef);
}
if (usageNumRef) {
CFRelease(usageNumRef);
}
if (!retval) {
*okay = 0;
}
return retval;
}
static CFDictionaryRef
create_vendor_match(const UInt32 vendor, int *okay)
{
CFDictionaryRef retval = NULL;
CFNumberRef vidNumRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &vendor);
const void *keys[1] = { (void *) CFSTR(kIOHIDVendorIDKey) };
const void *vals[1] = { (void *) vidNumRef };
if (vidNumRef) {
retval = CFDictionaryCreate(kCFAllocatorDefault, keys, vals, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CFRelease(vidNumRef);
}
if (!retval) {
*okay = 0;
}
return retval;
}
/* Initialize the IOHIDManager. Return 0 for success and -1 for failure. */
static int init_hid_manager(void)
{
int okay = 1;
const void *vals[] = {
(void *) create_usage_match(kHIDPage_GenericDesktop, kHIDUsage_GD_Joystick, &okay),
(void *) create_usage_match(kHIDPage_GenericDesktop, kHIDUsage_GD_GamePad, &okay),
(void *) create_usage_match(kHIDPage_GenericDesktop, kHIDUsage_GD_MultiAxisController, &okay),
(void *) create_vendor_match(VALVE_USB_VID, &okay),
};
const size_t numElements = SDL_arraysize(vals);
CFArrayRef matchingArray = okay ? CFArrayCreate(kCFAllocatorDefault, vals, numElements, &kCFTypeArrayCallBacks) : NULL;
size_t i;
for (i = 0; i < numElements; i++) {
if (vals[i]) {
CFRelease((CFTypeRef) vals[i]);
}
}
/* Initialize all the HID Manager Objects */
hid_mgr = IOHIDManagerCreate(kCFAllocatorDefault, kIOHIDOptionsTypeNone);
if (hid_mgr) {
IOHIDManagerSetDeviceMatchingMultiple(hid_mgr, matchingArray);
IOHIDManagerScheduleWithRunLoop(hid_mgr, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
IOHIDManagerRegisterDeviceRemovalCallback(hid_mgr, hid_device_removal_callback, NULL);
}
if (matchingArray != NULL) {
CFRelease(matchingArray);
}
return hid_mgr ? 0 : -1;
}
/* Initialize the IOHIDManager if necessary. This is the public function, and
it is safe to call this function repeatedly. Return 0 for success and -1
for failure. */
int HID_API_EXPORT hid_init(void)
{
if (!hid_mgr) {
return init_hid_manager();
}
/* Already initialized. */
return 0;
}
int HID_API_EXPORT hid_exit(void)
{
if (hid_mgr) {
/* Close the HID manager. */
IOHIDManagerClose(hid_mgr, kIOHIDOptionsTypeNone);
CFRelease(hid_mgr);
hid_mgr = NULL;
}
return 0;
}
static void process_pending_events() {
SInt32 res;
do {
res = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.001, FALSE);
} while(res != kCFRunLoopRunFinished && res != kCFRunLoopRunTimedOut);
}
struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct hid_device_info *root = NULL; // return object
struct hid_device_info *cur_dev = NULL;
CFIndex num_devices;
CFSetRef device_set;
IOHIDDeviceRef *device_array;
int i;
const char *hint = SDL_GetHint(SDL_HINT_HIDAPI_IGNORE_DEVICES);
/* Set up the HID Manager if it hasn't been done */
if (hid_init() < 0)
return NULL;
/* give the IOHIDManager a chance to update itself */
process_pending_events();
/* Get a list of the Devices */
device_set = IOHIDManagerCopyDevices(hid_mgr);
if (!device_set)
return NULL;
/* Convert the list into a C array so we can iterate easily. */
num_devices = CFSetGetCount(device_set);
if (!num_devices) {
CFRelease(device_set);
return NULL;
}
device_array = (IOHIDDeviceRef*)calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
/* Iterate over each device, making an entry for it. */
for (i = 0; i < num_devices; i++) {
unsigned short dev_vid;
unsigned short dev_pid;
#define BUF_LEN 256
wchar_t buf[BUF_LEN];
char cbuf[BUF_LEN];
IOHIDDeviceRef dev = device_array[i];
if (!dev) {
continue;
}
#if 0 // Prefer direct HID support as that has extended functionality
#if defined(SDL_JOYSTICK_MFI)
// We want to prefer Game Controller support where available,
// as Apple will likely be requiring that for supported devices.
extern SDL_bool IOS_SupportedHIDDevice(IOHIDDeviceRef device);
if (IOS_SupportedHIDDevice(dev)) {
continue;
}
#endif
#endif
dev_vid = get_vendor_id(dev);
dev_pid = get_product_id(dev);
/* 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;
}
}
/* Check the VID/PID against the arguments */
if ((vendor_id == 0x0 || dev_vid == vendor_id) &&
(product_id == 0x0 || dev_pid == product_id)) {
struct hid_device_info *tmp;
/* 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;
// Get the Usage Page and Usage for this device.
cur_dev->usage_page = get_int_property(dev, CFSTR(kIOHIDPrimaryUsagePageKey));
cur_dev->usage = get_int_property(dev, CFSTR(kIOHIDPrimaryUsageKey));
/* Fill out the record */
cur_dev->next = NULL;
make_path(dev, cbuf, sizeof(cbuf));
cur_dev->path = strdup(cbuf);
/* Serial Number */
get_serial_number(dev, buf, BUF_LEN);
cur_dev->serial_number = dup_wcs(buf);
/* Manufacturer and Product strings */
get_manufacturer_string(dev, buf, BUF_LEN);
cur_dev->manufacturer_string = dup_wcs(buf);
get_product_string(dev, buf, BUF_LEN);
cur_dev->product_string = dup_wcs(buf);
/* VID/PID */
cur_dev->vendor_id = dev_vid;
cur_dev->product_id = dev_pid;
/* Release Number */
cur_dev->release_number = get_int_property(dev, CFSTR(kIOHIDVersionNumberKey));
/* Interface Number (Unsupported on Mac)*/
cur_dev->interface_number = -1;
}
}
free(device_array);
CFRelease(device_set);
return root;
}
void HID_API_EXPORT hid_free_enumeration(struct hid_device_info *devs)
{
/* This function is identical to the Linux version. Platform independent. */
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_API_EXPORT hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number)
{
/* This function is identical to the Linux version. Platform independent. */
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 (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;
}
/* The Run Loop calls this function for each input report received.
This function puts the data into a linked list to be picked up by
hid_read(). */
static void hid_report_callback(void *context, IOReturn result, void *sender,
IOHIDReportType report_type, uint32_t report_id,
uint8_t *report, CFIndex report_length)
{
struct input_report *rpt;
hid_device *dev = (hid_device *)context;
/* Make a new Input Report object */
rpt = (struct input_report *)calloc(1, sizeof(struct input_report));
rpt->data = (uint8_t *)calloc(1, report_length);
memcpy(rpt->data, report, report_length);
rpt->len = report_length;
rpt->next = NULL;
/* Lock this section */
pthread_mutex_lock(&dev->mutex);
/* Attach the new report object to the end of the list. */
if (dev->input_reports == NULL) {
/* The list is empty. Put it at the root. */
dev->input_reports = rpt;
}
else {
/* Find the end of the list and attach. */
struct input_report *cur = dev->input_reports;
int num_queued = 0;
while (cur->next != NULL) {
cur = cur->next;
num_queued++;
}
cur->next = rpt;
/* Pop one off if we've reached 30 in the queue. This
way we don't grow forever if the user never reads
anything from the device. */
if (num_queued > 30) {
return_data(dev, NULL, 0);
}
}
/* Signal a waiting thread that there is data. */
pthread_cond_signal(&dev->condition);
/* Unlock */
pthread_mutex_unlock(&dev->mutex);
}
/* This gets called when the read_thred's run loop gets signaled by
hid_close(), and serves to stop the read_thread's run loop. */
static void perform_signal_callback(void *context)
{
hid_device *dev = (hid_device *)context;
CFRunLoopStop(dev->run_loop); //TODO: CFRunLoopGetCurrent()
}
static void *read_thread(void *param)
{
hid_device *dev = (hid_device *)param;
CFRunLoopSourceContext ctx;
SInt32 code;
/* Move the device's run loop to this thread. */
IOHIDDeviceScheduleWithRunLoop(dev->device_handle, CFRunLoopGetCurrent(), dev->run_loop_mode);
/* Create the RunLoopSource which is used to signal the
event loop to stop when hid_close() is called. */
memset(&ctx, 0, sizeof(ctx));
ctx.version = 0;
ctx.info = dev;
ctx.perform = &perform_signal_callback;
dev->source = CFRunLoopSourceCreate(kCFAllocatorDefault, 0/*order*/, &ctx);
CFRunLoopAddSource(CFRunLoopGetCurrent(), dev->source, dev->run_loop_mode);
/* Store off the Run Loop so it can be stopped from hid_close()
and on device disconnection. */
dev->run_loop = CFRunLoopGetCurrent();
/* Notify the main thread that the read thread is up and running. */
pthread_barrier_wait(&dev->barrier);
/* Run the Event Loop. CFRunLoopRunInMode() will dispatch HID input
reports into the hid_report_callback(). */
while (!dev->shutdown_thread && !dev->disconnected) {
code = CFRunLoopRunInMode(dev->run_loop_mode, 1000/*sec*/, FALSE);
/* Return if the device has been disconnected */
if (code == kCFRunLoopRunFinished) {
dev->disconnected = 1;
break;
}
/* Break if The Run Loop returns Finished or Stopped. */
if (code != kCFRunLoopRunTimedOut &&
code != kCFRunLoopRunHandledSource) {
/* There was some kind of error. Setting
shutdown seems to make sense, but
there may be something else more appropriate */
dev->shutdown_thread = 1;
break;
}
}
/* Now that the read thread is stopping, Wake any threads which are
waiting on data (in hid_read_timeout()). Do this under a mutex to
make sure that a thread which is about to go to sleep waiting on
the condition acutally will go to sleep before the condition is
signaled. */
pthread_mutex_lock(&dev->mutex);
pthread_cond_broadcast(&dev->condition);
pthread_mutex_unlock(&dev->mutex);
/* Wait here until hid_close() is called and makes it past
the call to CFRunLoopWakeUp(). This thread still needs to
be valid when that function is called on the other thread. */
pthread_barrier_wait(&dev->shutdown_barrier);
return NULL;
}
hid_device * HID_API_EXPORT hid_open_path(const char *path, int bExclusive)
{
int i;
hid_device *dev = NULL;
CFIndex num_devices;
CFSetRef device_set;
IOHIDDeviceRef *device_array;
dev = new_hid_device();
/* Set up the HID Manager if it hasn't been done */
if (hid_init() < 0)
return NULL;
/* give the IOHIDManager a chance to update itself */
process_pending_events();
device_set = IOHIDManagerCopyDevices(hid_mgr);
if (!device_set)
return NULL;
num_devices = CFSetGetCount(device_set);
device_array = (IOHIDDeviceRef *)calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
for (i = 0; i < num_devices; i++) {
char cbuf[BUF_LEN];
IOHIDDeviceRef os_dev = device_array[i];
make_path(os_dev, cbuf, sizeof(cbuf));
if (!strcmp(cbuf, path)) {
// Matched Paths. Open this Device.
IOReturn ret = IOHIDDeviceOpen(os_dev, kIOHIDOptionsTypeNone);
if (ret == kIOReturnSuccess) {
char str[32];
struct hid_device_list_node *node;
free(device_array);
CFRelease(device_set);
dev->device_handle = os_dev;
/* Create the buffers for receiving data */
dev->max_input_report_len = (CFIndex) get_max_report_length(os_dev);
SDL_assert(dev->max_input_report_len > 0);
dev->input_report_buf = (uint8_t *)calloc(dev->max_input_report_len, sizeof(uint8_t));
/* Create the Run Loop Mode for this device.
printing the reference seems to work. */
sprintf(str, "HIDAPI_%p", os_dev);
dev->run_loop_mode =
CFStringCreateWithCString(NULL, str, kCFStringEncodingASCII);
/* Attach the device to a Run Loop */
IOHIDDeviceRegisterInputReportCallback(
os_dev, dev->input_report_buf, dev->max_input_report_len,
&hid_report_callback, dev);
node = (struct hid_device_list_node *)calloc(1, sizeof(struct hid_device_list_node));
node->dev = dev;
node->next = device_list;
device_list = node;
/* Start the read thread */
pthread_create(&dev->thread, NULL, read_thread, dev);
/* Wait here for the read thread to be initialized. */
pthread_barrier_wait(&dev->barrier);
return dev;
}
else {
goto return_error;
}
}
}
return_error:
free(device_array);
CFRelease(device_set);
free_hid_device(dev);
return NULL;
}
static int set_report(hid_device *dev, IOHIDReportType type, const unsigned char *data, size_t length)
{
const char *pass_through_magic = "MAGIC0";
size_t pass_through_magic_length = strlen(pass_through_magic);
unsigned char report_id = data[0];
const unsigned char *data_to_send;
size_t length_to_send;
IOReturn res;
/* Return if the device has been disconnected. */
if (dev->disconnected)
return -1;
if (report_id == 0x0) {
/* Not using numbered Reports.
Don't send the report number. */
data_to_send = data+1;
length_to_send = length-1;
}
else if (length > 6 && memcmp(data, pass_through_magic, pass_through_magic_length) == 0) {
report_id = data[pass_through_magic_length];
data_to_send = data+pass_through_magic_length;
length_to_send = length-pass_through_magic_length;
}
else {
/* Using numbered Reports.
Send the Report Number */
data_to_send = data;
length_to_send = length;
}
if (!dev->disconnected) {
res = IOHIDDeviceSetReport(dev->device_handle,
type,
report_id, /* Report ID*/
data_to_send, length_to_send);
if (res == kIOReturnSuccess) {
return (int)length;
}
else if (res == kIOReturnUnsupported) {
/*printf("kIOReturnUnsupported\n");*/
return -1;
}
else {
/*printf("0x%x\n", res);*/
return -1;
}
}
return -1;
}
int HID_API_EXPORT hid_write(hid_device *dev, const unsigned char *data, size_t length)
{
return set_report(dev, kIOHIDReportTypeOutput, data, length);
}
/* Helper function, so that this isn't duplicated in hid_read(). */
static int return_data(hid_device *dev, unsigned char *data, size_t length)
{
/* Copy the data out of the linked list item (rpt) into the
return buffer (data), and delete the liked list item. */
struct input_report *rpt = dev->input_reports;
size_t len = 0;
if (rpt != NULL) {
len = (length < rpt->len)? length: rpt->len;
memcpy(data, rpt->data, len);
dev->input_reports = rpt->next;
free(rpt->data);
free(rpt);
}
return (int)len;
}
static int cond_wait(const hid_device *dev, pthread_cond_t *cond, pthread_mutex_t *mutex)
{
while (!dev->input_reports) {
int res = pthread_cond_wait(cond, mutex);
if (res != 0)
return res;
/* A res of 0 means we may have been signaled or it may
be a spurious wakeup. Check to see that there's acutally
data in the queue before returning, and if not, go back
to sleep. See the pthread_cond_timedwait() man page for
details. */
if (dev->shutdown_thread || dev->disconnected)
return -1;
}
return 0;
}
static int cond_timedwait(const hid_device *dev, pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime)
{
while (!dev->input_reports) {
int res = pthread_cond_timedwait(cond, mutex, abstime);
if (res != 0)
return res;
/* A res of 0 means we may have been signaled or it may
be a spurious wakeup. Check to see that there's acutally
data in the queue before returning, and if not, go back
to sleep. See the pthread_cond_timedwait() man page for
details. */
if (dev->shutdown_thread || dev->disconnected)
return -1;