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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:
http://github.com/signal11/hidapi .
********************************************************/
#include <IOKit/hid/IOHIDManager.h>
#include <IOKit/hid/IOHIDKeys.h>
#include <wchar.h>
#include <locale.h>
#include <pthread.h>
#include "hidapi.h"
/* 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;
uint8_t *input_report_buf;
struct input_report *input_reports;
pthread_mutex_t mutex;
hid_device *next;
};
/* Static list of all the devices open. This way when a device gets
disconnected, its hid_device structure can be marked as disconnected
from hid_device_removal_callback(). */
static hid_device *device_list = NULL;
static hid_device *new_hid_device(void)
{
hid_device *dev = 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->input_report_buf = NULL;
dev->input_reports = NULL;
dev->next = NULL;
pthread_mutex_init(&dev->mutex, NULL);
/* Add the new record to the device_list. */
if (!device_list)
device_list = dev;
else {
hid_device *d = device_list;
while (d) {
if (!d->next) {
d->next = dev;
break;
}
d = d->next;
}
}
return dev;
}
static void free_hid_device(hid_device *dev)
{
if (!dev)
return;
/* Delete any input reports still left over. */
struct input_report *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);
free(dev->input_report_buf);
pthread_mutex_destroy(&dev->mutex);
/* Remove it from the device list. */
hid_device *d = device_list;
if (d == dev) {
device_list = d->next;
}
else {
while (d) {
if (d->next == dev) {
d->next = d->next->next;
break;
}
d = d->next;
}
}
/* Free the structure itself. */
free(dev);
}
static IOHIDManagerRef hid_mgr = 0x0;
#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 = IOHIDDeviceGetProperty(device, prop);
buf[0] = 0x0000;
if (str) {
CFRange range;
range.location = 0;
range.length = len;
CFIndex used_buf_len;
CFStringGetBytes(str,
range,
kCFStringEncodingUTF32LE,
(char)'?',
FALSE,
(UInt8*)buf,
len,
&used_buf_len);
buf[len-1] = 0x00000000;
return used_buf_len;
}
else
return 0;
}
static int get_string_property_utf8(IOHIDDeviceRef device, CFStringRef prop, char *buf, size_t len)
{
CFStringRef str = IOHIDDeviceGetProperty(device, prop);
buf[0] = 0x0000;
if (str) {
CFRange range;
range.location = 0;
range.length = len;
CFIndex used_buf_len;
CFStringGetBytes(str,
range,
kCFStringEncodingUTF8,
(char)'?',
FALSE,
(UInt8*)buf,
len,
&used_buf_len);
buf[len-1] = 0x00000000;
return 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 = 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 init_hid_manager(void)
{
/* Initialize all the HID Manager Objects */
hid_mgr = IOHIDManagerCreate(kCFAllocatorDefault, kIOHIDOptionsTypeNone);
IOHIDManagerSetDeviceMatching(hid_mgr, NULL);
IOHIDManagerScheduleWithRunLoop(hid_mgr, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
IOHIDManagerOpen(hid_mgr, kIOHIDOptionsTypeNone);
}
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;
int i;
setlocale(LC_ALL,"");
/* Set up the HID Manager if it hasn't been done */
if (!hid_mgr)
init_hid_manager();
/* Get a list of the Devices */
CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr);
/* Convert the list into a C array so we can iterate easily. */
num_devices = CFSetGetCount(device_set);
IOHIDDeviceRef *device_array = 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];
dev_vid = get_vendor_id(dev);
dev_pid = get_product_id(dev);
/* Check the VID/PID against the arguments */
if ((vendor_id == 0x0 && product_id == 0x0) ||
(vendor_id == dev_vid && product_id == dev_pid)) {
struct hid_device_info *tmp;
size_t len;
/* VID/PID match. Create the record. */
tmp = malloc(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;
len = 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, 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);
}
hid_free_enumeration(devs);
return handle;
}
static void hid_device_removal_callback(void *context, IOReturn result,
void *sender, IOHIDDeviceRef dev_ref)
{
hid_device *d = device_list;
while (d) {
if (d->device_handle == dev_ref) {
d->disconnected = 1;
}
d = d->next;
}
}
/* 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 = context;
/* Make a new Input Report object */
rpt = calloc(1, sizeof(struct input_report));
rpt->data = calloc(1, report_length);
memcpy(rpt->data, report, report_length);
rpt->len = report_length;
rpt->next = NULL;
/* 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;
while (cur->next != NULL)
cur = cur->next;
cur->next = rpt;
}
/* Stop the Run Loop. This is mostly used for when blocking is
enabled, but it doesn't hurt for non-blocking as well. */
CFRunLoopStop(CFRunLoopGetCurrent());
}
hid_device * HID_API_EXPORT hid_open_path(const char *path)
{
int i;
hid_device *dev = NULL;
CFIndex num_devices;
dev = new_hid_device();
/* Set up the HID Manager if it hasn't been done */
if (!hid_mgr)
init_hid_manager();
CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr);
num_devices = CFSetGetCount(device_set);
IOHIDDeviceRef *device_array = calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
for (i = 0; i < num_devices; i++) {
char cbuf[BUF_LEN];
size_t len;
IOHIDDeviceRef os_dev = device_array[i];
len = 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];
CFIndex max_input_report_len;
free(device_array);
CFRelease(device_set);
dev->device_handle = os_dev;
/* Create the buffers for receiving data */
max_input_report_len = (CFIndex) get_max_report_length(os_dev);
dev->input_report_buf = calloc(max_input_report_len, sizeof(uint8_t));
/* Create the Run Loop Mode for this device.
printing the reference seems to work. */
sprintf(str, "%p", os_dev);
dev->run_loop_mode =
CFStringCreateWithCString(NULL, str, kCFStringEncodingASCII);
/* Attach the device to a Run Loop */
IOHIDDeviceScheduleWithRunLoop(os_dev, CFRunLoopGetCurrent(), dev->run_loop_mode);
IOHIDDeviceRegisterInputReportCallback(
os_dev, dev->input_report_buf, max_input_report_len,
&hid_report_callback, dev);
IOHIDManagerRegisterDeviceRemovalCallback(hid_mgr, hid_device_removal_callback, NULL);
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 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 (data[0] == 0x0) {
/* Not using numbered Reports.
Don't send the report number. */
data_to_send = data+1;
length_to_send = length-1;
}
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,
data[0], /* Report ID*/
data_to_send, length_to_send);
if (res == kIOReturnSuccess) {
return length;
}
else
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 = (length < rpt->len)? length: rpt->len;
memcpy(data, rpt->data, len);
dev->input_reports = rpt->next;
free(rpt->data);
free(rpt);
return len;
}
int HID_API_EXPORT hid_read(hid_device *dev, unsigned char *data, size_t length)
{
int ret_val = -1;
/* Lock this function */
pthread_mutex_lock(&dev->mutex);
/* There's an input report queued up. Return it. */
if (dev->input_reports) {
/* Return the first one */
ret_val = return_data(dev, data, length);
goto ret;
}
/* Return if the device has been disconnected. */
if (dev->disconnected) {
ret_val = -1;
goto ret;
}
/* There are no input reports queued up.
Need to get some from the OS. */
/* Move the device's run loop to this thread. */
IOHIDDeviceScheduleWithRunLoop(dev->device_handle, CFRunLoopGetCurrent(), dev->run_loop_mode);
if (dev->blocking) {
/* Run the Run Loop until it stops timing out. In other
words, until something happens. This is necessary because
there is no INFINITE timeout value. */
SInt32 code;
while (1) {
code = CFRunLoopRunInMode(dev->run_loop_mode, 1000, TRUE);
/* Return if the device has been disconnected */
if (code == kCFRunLoopRunFinished) {
dev->disconnected = 1;
ret_val = -1;
goto ret;
}
/* Return if some data showed up. */
if (dev->input_reports)
break;
/* Break if The Run Loop returns Finished or Stopped. */
if (code != kCFRunLoopRunTimedOut &&
code != kCFRunLoopRunHandledSource)
break;
}
/* See if the run loop and callback gave us any reports. */
if (dev->input_reports) {
ret_val = return_data(dev, data, length);
goto ret;
}
else {
dev->disconnected = 1;
ret_val = -1; /* An error occured (maybe CTRL-C?). */
goto ret;
}
}
else {
/* Non-blocking. See if the OS has any reports to give. */
SInt32 code;
code = CFRunLoopRunInMode(dev->run_loop_mode, 0, TRUE);
if (code == kCFRunLoopRunFinished) {
/* The run loop is finished, indicating an error
or the device had been disconnected. */
dev->disconnected = 1;
ret_val = -1;
goto ret;
}
if (dev->input_reports) {
/* Return the first one */
ret_val = return_data(dev, data, length);
goto ret;
}
else {
ret_val = 0; /* No data*/
goto ret;
}
}
ret:
/* Unlock */
pthread_mutex_unlock(&dev->mutex);
return ret_val;
}
int HID_API_EXPORT hid_set_nonblocking(hid_device *dev, int nonblock)
{
/* All Nonblocking operation is handled by the library. */
dev->blocking = !nonblock;
return 0;
}
int HID_API_EXPORT hid_send_feature_report(hid_device *dev, const unsigned char *data, size_t length)
{
return set_report(dev, kIOHIDReportTypeFeature, data, length);
}
int HID_API_EXPORT hid_get_feature_report(hid_device *dev, unsigned char *data, size_t length)
{
CFIndex len = length;
IOReturn res;
/* Return if the device has been unplugged. */
if (dev->disconnected)
return -1;
res = IOHIDDeviceGetReport(dev->device_handle,
kIOHIDReportTypeFeature,
data[0], /* Report ID */
data, &len);
if (res == kIOReturnSuccess)
return len;
else
return -1;
}
void HID_API_EXPORT hid_close(hid_device *dev)
{
if (!dev)
return;
/* Close the OS handle to the device, but only if it's not
been unplugged. If it's been unplugged, then calling
IOHIDDeviceClose() will crash. */
if (!dev->disconnected) {
IOHIDDeviceRegisterInputReportCallback(dev->device_handle,
dev->input_report_buf,
(CFIndex)get_max_report_length(dev->device_handle),
NULL, dev);
IOHIDDeviceUnscheduleFromRunLoop(dev->device_handle, CFRunLoopGetCurrent(), dev->run_loop_mode);
IOHIDDeviceClose(dev->device_handle, kIOHIDOptionsTypeNone);
}
free_hid_device(dev);
}
int HID_API_EXPORT_CALL hid_get_manufacturer_string(hid_device *dev, wchar_t *string, size_t maxlen)
{
return get_manufacturer_string(dev->device_handle, string, maxlen);
}
int HID_API_EXPORT_CALL hid_get_product_string(hid_device *dev, wchar_t *string, size_t maxlen)
{
return get_product_string(dev->device_handle, string, maxlen);
}
int HID_API_EXPORT_CALL hid_get_serial_number_string(hid_device *dev, wchar_t *string, size_t maxlen)
{
return get_serial_number(dev->device_handle, string, maxlen);
}
int HID_API_EXPORT_CALL hid_get_indexed_string(hid_device *dev, int string_index, wchar_t *string, size_t maxlen)
{
// TODO:
return 0;
}
HID_API_EXPORT const wchar_t * HID_API_CALL hid_error(hid_device *dev)
{
// TODO:
return NULL;
}
#if 0
static int32_t get_location_id(IOHIDDeviceRef device)
{
return get_int_property(device, CFSTR(kIOHIDLocationIDKey));
}
static int32_t get_usage(IOHIDDeviceRef device)
{
int32_t res;
res = get_int_property(device, CFSTR(kIOHIDDeviceUsageKey));
if (!res)
res = get_int_property(device, CFSTR(kIOHIDPrimaryUsageKey));
return res;
}
static int32_t get_usage_page(IOHIDDeviceRef device)
{
int32_t res;
res = get_int_property(device, CFSTR(kIOHIDDeviceUsagePageKey));
if (!res)
res = get_int_property(device, CFSTR(kIOHIDPrimaryUsagePageKey));
return res;
}
static int get_transport(IOHIDDeviceRef device, wchar_t *buf, size_t len)
{
return get_string_property(device, CFSTR(kIOHIDTransportKey), buf, len);
}
int main(void)
{
IOHIDManagerRef mgr;
int i;
mgr = IOHIDManagerCreate(kCFAllocatorDefault, kIOHIDOptionsTypeNone);
IOHIDManagerSetDeviceMatching(mgr, NULL);
IOHIDManagerOpen(mgr, kIOHIDOptionsTypeNone);
CFSetRef device_set = IOHIDManagerCopyDevices(mgr);
CFIndex num_devices = CFSetGetCount(device_set);
IOHIDDeviceRef *device_array = calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
setlocale(LC_ALL, "");
for (i = 0; i < num_devices; i++) {
IOHIDDeviceRef dev = device_array[i];
printf("Device: %p\n", dev);
printf(" %04hx %04hx\n", get_vendor_id(dev), get_product_id(dev));
wchar_t serial[256], buf[256];
char cbuf[256];
get_serial_number(dev, serial, 256);
printf(" Serial: %ls\n", serial);
printf(" Loc: %ld\n", get_location_id(dev));
get_transport(dev, buf, 256);
printf(" Trans: %ls\n", buf);
make_path(dev, cbuf, 256);
printf(" Path: %s\n", cbuf);
}
return 0;
}
#endif
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