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#include <device.h>
#include <usb/usb_device.h>
#include <usb/class/usb_hid.h>
LOG_MODULE_REGISTER(zmk_usb_hid, CONFIG_ZMK_USB_HID_LOG_LEVEL);
static const u8_t hid_report_desc[] = HID_KEYBOARD_REPORT_DESC();
static enum usb_dc_status_code usb_status;
static struct device *hid_dev;
static u8_t report[8] = { 0x00, 0x00 };
#define KEY_OFFSET 0x02
#define MAX_KEYS 6
int zmk_usb_hid_press_key(enum hid_kbd_code code)
{
if (usb_status == USB_DC_SUSPEND) {
return usb_wakeup_request();
}
for (int idx = 0; idx < MAX_KEYS; idx++) {
if (report[idx + KEY_OFFSET] != 0U) {
continue;
}
report[idx + KEY_OFFSET] = code;
return hid_int_ep_write(hid_dev, report, sizeof(report), NULL);
}
return -EINVAL;
}
int zmk_usb_hid_release_key(enum hid_kbd_code code)
{
for (int idx = 0; idx < MAX_KEYS; idx++) {
if (report[idx + KEY_OFFSET] != code) {
continue;
}
report[idx + KEY_OFFSET] = 0U;
return hid_int_ep_write(hid_dev, report, sizeof(report), NULL);
}
return -EINVAL;
}
void usb_hid_status_cb(enum usb_dc_status_code status, const u8_t *params)
{
usb_status = status;
};
int zmk_usb_hid_init()
{
int usb_enable_ret;
hid_dev = device_get_binding("HID_0");
if (hid_dev == NULL) {
LOG_ERR("Unable to locate HID device");
return -EINVAL;
}
usb_hid_register_device(hid_dev,
hid_report_desc, sizeof(hid_report_desc),
NULL);
usb_hid_init(hid_dev);
usb_enable_ret = usb_enable(usb_hid_status_cb);
if (usb_enable_ret != 0) {
LOG_ERR("Unable to enable USB");
return -EINVAL;
}
return 0;
}
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