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/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/usb/usbd.h>

const struct usb_device_descriptor dev = {
	.bLength = USB_DT_DEVICE_SIZE,
	.bDescriptorType = USB_DT_DEVICE,
	.bcdUSB = 0x0200,
	.bDeviceClass = 0xFF,
	.bDeviceSubClass = 0,
	.bDeviceProtocol = 0,
	.bMaxPacketSize0 = 64,
	.idVendor = 0xCAFE,
	.idProduct = 0xCAFE,
	.bcdDevice = 0x0200,
	.iManufacturer = 1,
	.iProduct = 2,
	.iSerialNumber = 3,
	.bNumConfigurations = 1,
};

const struct usb_interface_descriptor iface = {
	.bLength = USB_DT_INTERFACE_SIZE,
	.bDescriptorType = USB_DT_INTERFACE,
	.bInterfaceNumber = 0,
	.bAlternateSetting = 0,
	.bNumEndpoints = 0,
	.bInterfaceClass = 0xFF,
	.bInterfaceSubClass = 0,
	.bInterfaceProtocol = 0,
	.iInterface = 0,
};

const struct usb_interface ifaces[] = {{
	.num_altsetting = 1,
	.altsetting = &iface,
}};

const struct usb_config_descriptor config = {
	.bLength = USB_DT_CONFIGURATION_SIZE,
	.bDescriptorType = USB_DT_CONFIGURATION,
	.wTotalLength = 0,
	.bNumInterfaces = 1,
	.bConfigurationValue = 1,
	.iConfiguration = 0,
	.bmAttributes = 0x80,
	.bMaxPower = 0x32,

	.interface = ifaces,
};

const char *usb_strings[] = {
	"x",
	"Black Sphere Technologies",
	"Simple Device",
	"1001",
};

static int simple_control_callback(usbd_device *usbd_dev, struct usb_setup_data *req, u8 **buf,
		u16 *len, void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req))
{
	(void)buf;
	(void)len;
	(void)complete;
	(void)usbd_dev;

	if (req->bmRequestType != 0x40)
		return 0; /* Only accept vendor request. */

	if (req->wValue & 1)
		gpio_set(GPIOC, GPIO6);
	else
		gpio_clear(GPIOC, GPIO6);

	return 1;
}

int main(void)
{
	usbd_device *usbd_dev;

	rcc_clock_setup_in_hse_8mhz_out_72mhz();

	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
	rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_OTGFSEN);

	/* LED output */
	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);

	usbd_dev = usbd_init(&stm32f107_usb_driver, &dev, &config, usb_strings, 4);
	usbd_register_control_callback(
				usbd_dev,
				USB_REQ_TYPE_VENDOR,
				USB_REQ_TYPE_TYPE,
				simple_control_callback);

	while (1)
		usbd_poll(usbd_dev);
}