hid_device * HID_API_EXPORT hid_open_path(const char *path)
{
hid_device *dev = NULL;
hid_init();
dev = new_hid_device();
if (kernel_version == 0) {
struct utsname name;
int major, minor, release;
int ret;
uname(&name);
ret = sscanf(name.release, "%d.%d.%d", &major, &minor, &release);
if (ret == 3) {
kernel_version = major << 16 | minor << 8 | release;
//printf("Kernel Version: %d\n", kernel_version);
}
else {
printf("Couldn't sscanf() version string %s\n", name.release);
}
}
// OPEN HERE //
dev->device_handle = open(path, O_RDWR);
// If we have a good handle, return it.
if (dev->device_handle > 0) {
/* Get the report descriptor */
int res;
struct hidraw_report_descriptor rpt_desc;
res = get_report_descriptor(dev->device_handle, &rpt_desc);
if (res >= 0) {
/* Determine if this device uses numbered reports. */
dev->uses_numbered_reports =
uses_numbered_reports(rpt_desc.value,
rpt_desc.size);
}
return dev;
}
else {
// Unable to open any devices.
free(dev);
return NULL;
}
}
static unsigned int
handle_standard_requests()
{
switch(usb_setup_buffer.bmRequestType) {
case 0x80: /* standard device IN requests */
switch(usb_setup_buffer.bRequest) {
case GET_DESCRIPTOR:
switch (HIGH_BYTE(usb_setup_buffer.wValue)) {
case DEVICE:
get_device_descriptor();
break;
case CONFIGURATION:
get_configuration_descriptor();
break;
case STRING:
get_string_descriptor();
break;
default:
/* Unknown descriptor */
return 0;
}
break;
case GET_CONFIGURATION:
get_configuration();
break;
case GET_STATUS:
get_device_status();
break;
case GET_INTERFACE:
get_interface();
break;
default:
return 0;
}
break;
case 0x81: /* standard interface IN requests */
switch(usb_setup_buffer.bRequest) {
case GET_STATUS:
get_interface_status();
break;
#ifdef HID_ENABLED
case GET_DESCRIPTOR:
switch (USB_setup_buffer.wValue.byte.high) {
case REPORT:
get_report_descriptor();
break;
}
break;
#endif
default:
return 0;
}
break;
case 0x82: /* standard endpoint IN requests */
switch(usb_setup_buffer.bRequest) {
case GET_STATUS:
get_endpoint_status();
break;
default:
return 0;
}
break;
case 0x00: /* standard device OUT requests */
switch(usb_setup_buffer.bRequest) {
case SET_ADDRESS:
PRINTF("Address: %d\r\n", LOW_BYTE(usb_setup_buffer.wValue));
usb_flags |= USB_FLAG_ADDRESS_PENDING;
/* The actual setting of the address is done when the status packet
is sent. */
usb_send_ctrl_status();
break;
#if SETABLE_STRING_DESCRIPTORS > 0
case SET_DESCRIPTOR:
if (usb_setup_buffer.wValue.byte.high == STRING) {
set_string_descriptor();
} else {
return 0;
}
break;
#endif
case SET_CONFIGURATION:
if (set_configuration()) {
#if 0
config_msg.data.config = LOW_BYTE(usb_setup_buffer.wValue);
notify_user(&config_msg);
#endif
}
break;
default:
return 0;
}
break;
case 0x01: /* standard interface OUT requests */
switch(usb_setup_buffer.bRequest) {
case SET_INTERFACE:
/* Change interface here if we support more than one */
usb_send_ctrl_status();
break;
default:
return 0;
}
break;
case 0x02: /* standard endpoint OUT requests */
switch(usb_setup_buffer.bRequest) {
case SET_FEATURE:
case CLEAR_FEATURE:
if (usb_setup_buffer.wValue == ENDPOINT_HALT_FEATURE) {
usb_arch_halt_endpoint(usb_setup_buffer.wIndex, usb_setup_buffer.bRequest== SET_FEATURE);
usb_send_ctrl_status();
} else {
usb_error_stall();
}
break;
default:
return 0;
}
break;
#ifdef HID_ENABLED
case 0xa1: /* class specific interface IN request*/
switch(USB_setup_buffer.bRequest) {
case GET_HID_REPORT:
PRINTF("Get report\r\n");
send_ctrl_response((code u_int8_t*)&zero_byte,
sizeof(zero_byte));
break;
case GET_HID_IDLE:
PRINTF("Get idle\r\n");
send_ctrl_response((code u_int8_t*)&zero_byte,
sizeof(zero_byte));
break;
default:
return 0;
}
break;
case 0x21: /* class specific interface OUT request*/
switch(USB_setup_buffer.bRequest) {
case SET_HID_IDLE:
PRINTF("Set idle\r\n");
send_ctrl_status();
break;
default:
return 0;
}
break;
#endif
default:
return 0;
}
return 1;
}
struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct udev *udev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices, *dev_list_entry;
struct hid_device_info *root = NULL; // return object
struct hid_device_info *cur_dev = NULL;
hid_init();
/* Create the udev object */
udev = udev_new();
if (!udev) {
printf("Can't create udev\n");
return NULL;
}
/* Create a list of the devices in the 'hidraw' subsystem. */
enumerate = udev_enumerate_new(udev);
udev_enumerate_add_match_subsystem(enumerate, "hidraw");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
/* For each item, see if it matches the vid/pid, and if so
create a udev_device record for it */
udev_list_entry_foreach(dev_list_entry, devices) {
const char *sysfs_path;
const char *dev_path;
const char *str;
struct udev_device *hid_dev; // The device's HID udev node.
struct udev_device *dev; // The actual hardware device.
struct udev_device *intf_dev; // The device's interface (in the USB sense).
unsigned short dev_vid;
unsigned short dev_pid;
/* Get the filename of the /sys entry for the device
and create a udev_device object (dev) representing it */
sysfs_path = udev_list_entry_get_name(dev_list_entry);
hid_dev = udev_device_new_from_syspath(udev, sysfs_path);
dev_path = udev_device_get_devnode(hid_dev);
/* The device pointed to by hid_dev contains information about
the hidraw device. In order to get information about the
USB device, get the parent device with the
subsystem/devtype pair of "usb"/"usb_device". This will
be several levels up the tree, but the function will find
it.*/
dev = udev_device_get_parent_with_subsystem_devtype(
hid_dev,
"usb",
"usb_device");
if (!dev) {
/* Unable to find parent usb device. */
goto next;
}
/* Get the VID/PID of the device */
str = udev_device_get_sysattr_value(dev,"idVendor");
dev_vid = (str)? strtol(str, NULL, 16): 0x0;
str = udev_device_get_sysattr_value(dev, "idProduct");
dev_pid = (str)? strtol(str, NULL, 16): 0x0;
/* 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;
/* Fill out the record */
cur_dev->next = NULL;
str = dev_path;
if (str) {
len = strlen(str);
cur_dev->path = calloc(len+1, sizeof(char));
strncpy(cur_dev->path, str, len+1);
cur_dev->path[len] = '\0';
}
else
cur_dev->path = NULL;
/* Serial Number */
cur_dev->serial_number
= copy_udev_string(dev, "serial");
/* Manufacturer and Product strings */
cur_dev->manufacturer_string
= copy_udev_string(dev, "manufacturer");
cur_dev->product_string
= copy_udev_string(dev, "product");
/* Usage Page and Usage */
int res;
struct hidraw_report_descriptor rpt_desc;
int device_handle = open(dev_path, O_RDWR);
if (device_handle > 0) {
res = get_report_descriptor(device_handle, &rpt_desc);
if (res >= 0) {
unsigned short page=0, usage=0;
/* Parse the usage and usage page
out of the report descriptor. */
get_usage(rpt_desc.value, rpt_desc.size, &page, &usage);
cur_dev->usage_page = page;
cur_dev->usage = usage;
}
close(device_handle);
}
/* VID/PID */
cur_dev->vendor_id = dev_vid;
cur_dev->product_id = dev_pid;
/* Release Number */
str = udev_device_get_sysattr_value(dev, "bcdDevice");
cur_dev->release_number = (str)? strtol(str, NULL, 16): 0x0;
/* Interface Number */
cur_dev->interface_number = -1;
/* Get a handle to the interface's udev node. */
intf_dev = udev_device_get_parent_with_subsystem_devtype(
hid_dev,
"usb",
"usb_interface");
if (intf_dev) {
str = udev_device_get_sysattr_value(intf_dev, "bInterfaceNumber");
cur_dev->interface_number = (str)? strtol(str, NULL, 16): -1;
}
}
else
goto next;
next:
udev_device_unref(hid_dev);
/* dev and intf_dev don't need to be (and can't be)
unref()d. It will cause a double-free() error. I'm not
sure why. */
}
/* Free the enumerator and udev objects. */
udev_enumerate_unref(enumerate);
udev_unref(udev);
return root;
}
