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#include <device.h>
#include <usb/usb_device.h>
#include <usb/class/usb_hid.h>
#include <dt-bindings/zmk/keys.h>
#include "keymap.h"
LOG_MODULE_REGISTER(zmk_usb_hid, CONFIG_ZMK_USB_HID_LOG_LEVEL);
#define MAX_KEYCODE KC_APP
static const u8_t hid_report_desc[] = {
/* USAGE_PAGE (Generic Desktop) */
HID_GI_USAGE_PAGE,
USAGE_GEN_DESKTOP,
/* USAGE (Keyboard) */
HID_LI_USAGE,
USAGE_GEN_DESKTOP_KEYBOARD,
/* COLLECTION (Application) */
HID_MI_COLLECTION,
COLLECTION_APPLICATION,
/* USAGE_PAGE (Keypad) */
HID_GI_USAGE_PAGE,
USAGE_GEN_DESKTOP_KEYPAD,
/* USAGE_MINIMUM (Keyboard LeftControl) */
HID_LI_USAGE_MIN(1),
0xE0,
/* USAGE_MAXIMUM (Keyboard Right GUI) */
HID_LI_USAGE_MAX(1),
0xE7,
/* LOGICAL_MINIMUM (0) */
HID_GI_LOGICAL_MIN(1),
0x00,
/* LOGICAL_MAXIMUM (1) */
HID_GI_LOGICAL_MAX(1),
0x01,
/* REPORT_SIZE (1) */
HID_GI_REPORT_SIZE,
0x01,
/* REPORT_COUNT (8) */
HID_GI_REPORT_COUNT,
0x08,
/* INPUT (Data,Var,Abs) */
HID_MI_INPUT,
0x02,
/* USAGE_PAGE (Keypad) */
HID_GI_USAGE_PAGE,
USAGE_GEN_DESKTOP_KEYPAD,
/* REPORT_SIZE (8) */
HID_GI_REPORT_SIZE,
0x08,
/* REPORT_COUNT (1) */
HID_GI_REPORT_COUNT,
0x07,
/* INPUT (Cnst,Var,Abs) */
HID_MI_INPUT,
0x03,
/* USAGE_PAGE (Keypad) */
HID_GI_USAGE_PAGE,
USAGE_GEN_DESKTOP_KEYPAD,
/* LOGICAL_MINIMUM (0) */
HID_GI_LOGICAL_MIN(1),
0x00,
/* LOGICAL_MAXIMUM (101) */
HID_GI_LOGICAL_MAX(1),
0x01,
/* USAGE_MINIMUM (Reserved) */
HID_LI_USAGE_MIN(1),
0x00,
/* USAGE_MAXIMUM (Keyboard Application) */
HID_LI_USAGE_MAX(1),
MAX_KEYCODE,
/* REPORT_SIZE (8) */
HID_GI_REPORT_SIZE,
0x01,
/* REPORT_COUNT (6) */
HID_GI_REPORT_COUNT,
MAX_KEYCODE + 1,
/* INPUT (Data,Ary,Abs) */
HID_MI_INPUT,
0x02,
/* USAGE_PAGE (Keypad) */
HID_GI_USAGE_PAGE,
USAGE_GEN_DESKTOP_KEYPAD,
/* REPORT_SIZE (8) */
HID_GI_REPORT_SIZE,
0x02,
/* REPORT_COUNT (6) */
HID_GI_REPORT_COUNT,
0x01,
/* INPUT (Cnst,Var,Abs) */
HID_MI_INPUT,
0x03,
/* END_COLLECTION */
HID_MI_COLLECTION_END,
};
static enum usb_dc_status_code usb_status;
static struct device *hid_dev;
struct boot_report
{
u8_t modifiers;
u8_t _unused;
u8_t keys[6];
} __packed;
struct extended_report
{
u8_t keys[13];
} __packed;
struct hid_report
{
struct boot_report boot;
struct extended_report extended;
} __packed report;
#define KEY_OFFSET 0x02
#define MAX_KEYS 6
#define TOGGLE_BOOT_KEY(match, val) \
for (int idx = 0; idx < MAX_KEYS; idx++) \
{ \
if (report.boot.keys[idx + KEY_OFFSET] != match) \
{ \
continue; \
} \
report.boot.keys[idx + KEY_OFFSET] = val; \
break; \
}
#define TOGGLE_EXT_KEY(code, val) WRITE_BIT(report.extended.keys[code / 8], code % 8, val)
int zmk_usb_hid_press_key(zmk_key code)
{
if (usb_status == USB_DC_SUSPEND)
{
return usb_wakeup_request();
}
if (code > MAX_KEYCODE)
{
return -EINVAL;
}
TOGGLE_BOOT_KEY(0U, code);
TOGGLE_EXT_KEY(code, true);
return hid_int_ep_write(hid_dev, (u8_t *)&report, sizeof(report), NULL);
}
int zmk_usb_hid_release_key(zmk_key code)
{
if (code > MAX_KEYCODE)
{
return -EINVAL;
}
TOGGLE_BOOT_KEY(code, 0U);
TOGGLE_EXT_KEY(code, false);
return hid_int_ep_write(hid_dev, (u8_t *)&report, sizeof(report), NULL);
}
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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