pios_usb_desc_hid_only.c

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>
 */

#include "pios_usb_desc_hid_only_priv.h" /* exported API */
#include "pios_usb_defs.h"               /* struct usb_*, USB_* */
#include "pios_usb_board_data.h"         /* PIOS_USB_BOARD_* */
#include "pios_usbhook.h"                /* PIOS_USBHOOK_Register* */
#include "pios_usb_hid.h"                /* PIOS_USB_HID_Register* */

static const struct usb_device_desc device_desc = {
        .bLength            = sizeof(struct usb_device_desc),
        .bDescriptorType    = USB_DESC_TYPE_DEVICE,
        .bcdUSB             = htousbs(0x0200),
        .bDeviceClass       = 0x00,
        .bDeviceSubClass    = 0x00,
        .bDeviceProtocol    = 0x00,
        .bMaxPacketSize0    = 64, /* Must be 64 for high-speed devices */
        .idVendor           = htousbs(PIOS_USB_BOARD_VENDOR_ID),
        .idProduct          = htousbs(PIOS_USB_BOARD_PRODUCT_ID),
        .bcdDevice          = htousbs(PIOS_USB_BOARD_DEVICE_VER),
        .iManufacturer      = 1,
        .iProduct           = 2,
        .iSerialNumber      = 3,
        .bNumConfigurations = 1,
};

static const uint8_t hid_report_desc[36] = {
        HID_GLOBAL_ITEM_2 (HID_TAG_GLOBAL_USAGE_PAGE),
        0x9C, 0xFF,             /* Usage Page 0xFF9C (Vendor Defined) */
        HID_LOCAL_ITEM_1  (HID_TAG_LOCAL_USAGE),
        0x01,                   /* Usage ID 0x0001 (0x01-0x1F uaually for top-level collections) */

        HID_MAIN_ITEM_1   (HID_TAG_MAIN_COLLECTION),
        0x01,                   /* Application */

        /* Device -> Host emulated serial channel */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_REPORT_ID),
        0x01,                   /* OpenPilot emulated serial channel (Device -> Host) */
        HID_LOCAL_ITEM_1  (HID_TAG_LOCAL_USAGE),
        0x02,
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_LOGICAL_MIN),
        0x00,                   /* Values range from min = 0x00 */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_LOGICAL_MAX),
        0xFF,                   /* Values range to max = 0xFF */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_REPORT_SIZE),
        0x08,                   /* 8 bits wide */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_REPORT_CNT),
        PIOS_USB_BOARD_HID_DATA_LENGTH-1, /* Need to leave room for a report ID */
        HID_MAIN_ITEM_1 (HID_TAG_MAIN_INPUT),
        0x03,                   /* Variable, Constant (read-only) */

        /* Host -> Device emulated serial channel */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_REPORT_ID),
        0x02,                   /* OpenPilot emulated Serial Channel (Host -> Device) */
        HID_LOCAL_ITEM_1  (HID_TAG_LOCAL_USAGE),
        0x02,
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_LOGICAL_MIN),
        0x00,                   /* Values range from min = 0x00 */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_LOGICAL_MAX),
        0xFF,                   /* Values range to max = 0xFF */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_REPORT_SIZE),
        0x08,                   /* 8 bits wide */
        HID_GLOBAL_ITEM_1 (HID_TAG_GLOBAL_REPORT_CNT),
        PIOS_USB_BOARD_HID_DATA_LENGTH-1, /* Need to leave room for a report ID */
        HID_MAIN_ITEM_1 (HID_TAG_MAIN_OUTPUT),
        0x82,                   /* Volatile, Variable */

        HID_MAIN_ITEM_0 (HID_TAG_MAIN_ENDCOLLECTION),
};

struct usb_config_hid_only {
        struct usb_configuration_desc         config;
        struct usb_interface_desc             hid_if;
        struct usb_hid_desc                   hid;
        struct usb_endpoint_desc              hid_in;
        struct usb_endpoint_desc              hid_out;
} __attribute__((packed));

const struct usb_config_hid_only config_hid_only = {
        .config = {
                .bLength              = sizeof(struct usb_configuration_desc),
                .bDescriptorType      = USB_DESC_TYPE_CONFIGURATION,
                .wTotalLength         = htousbs(sizeof(struct usb_config_hid_only)),
                .bNumInterfaces       = 1,
                .bConfigurationValue  = 1,
                .iConfiguration       = 0,
                .bmAttributes         = 0xC0,
                .bMaxPower            = 250/2, /* in units of 2ma */
        },
        .hid_if = {
                .bLength              = sizeof(struct usb_interface_desc),
                .bDescriptorType      = USB_DESC_TYPE_INTERFACE,
                .bInterfaceNumber     = 0,
                .bAlternateSetting    = 0,
                .bNumEndpoints        = 2,
                .bInterfaceClass      = USB_INTERFACE_CLASS_HID,
                .bInterfaceSubClass   = 0, /* no boot */
                .nInterfaceProtocol   = 0, /* none */
                .iInterface           = 0,
        },
        .hid = {
                .bLength = sizeof(struct usb_hid_desc),
                .bDescriptorType      = USB_DESC_TYPE_HID,
                .bcdHID               = htousbs(0x0110),
                .bCountryCode         = 0,
                .bNumDescriptors      = 1,
                .bClassDescriptorType = USB_DESC_TYPE_REPORT,
                .wItemLength          = htousbs(sizeof(hid_report_desc)),
        },
        .hid_in = {
                .bLength              = sizeof(struct usb_endpoint_desc),
                .bDescriptorType      = USB_DESC_TYPE_ENDPOINT,
                .bEndpointAddress     = USB_EP_IN(1),
                .bmAttributes         = USB_EP_ATTR_TT_INTERRUPT,
                .wMaxPacketSize       = htousbs(PIOS_USB_BOARD_HID_DATA_LENGTH),
                .bInterval            = 4, /* ms */
        },
        .hid_out = {
                .bLength              = sizeof(struct usb_endpoint_desc),
                .bDescriptorType      = USB_DESC_TYPE_ENDPOINT,
                .bEndpointAddress     = USB_EP_OUT(1),
                .bmAttributes         = USB_EP_ATTR_TT_INTERRUPT,
                .wMaxPacketSize       = htousbs(PIOS_USB_BOARD_HID_DATA_LENGTH),
                .bInterval            = 4, /* ms */
        },
};

int32_t PIOS_USB_DESC_HID_ONLY_Init(void)
{
        PIOS_USBHOOK_RegisterConfig(1, (uint8_t *)&config_hid_only, sizeof(config_hid_only));

        PIOS_USBHOOK_RegisterDevice((uint8_t *)&device_desc, sizeof(device_desc));

        PIOS_USB_HID_RegisterHidDescriptor((uint8_t *)&(config_hid_only.hid), sizeof(config_hid_only.hid));
        PIOS_USB_HID_RegisterHidReport((uint8_t *)hid_report_desc, sizeof(hid_report_desc));

        return 0;
}