/*
 * Copyright (C) 2014 Samsung Electronics
 *
 * Krzysztof Opasiak <k.opasiak@samsung.com>
 *
 * 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 2 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.
 */

/**
 * @file gadget-ms.c
 * @example gadget-ms.c
 * This is an example of how to create gadget with mass storage function
 * with two luns.
 */

#include <errno.h>
#include <stdio.h>
#include <linux/usb/ch9.h>
#include <usbg/usbg.h>

#define VENDOR          0x1d6b
#define PRODUCT         0x0104

int main(int argc, char **argv)
{
	usbg_state *s;
	usbg_gadget *g;
	usbg_config *c;
	usbg_function *f_ms;
	int ret = -EINVAL;
	int usbg_ret;

	usbg_gadget_attrs g_attrs = {
		.bcdUSB = 0x0200,
		.bDeviceClass =	USB_CLASS_PER_INTERFACE,
		.bDeviceSubClass = 0x00,
		.bDeviceProtocol = 0x00,
		.bMaxPacketSize0 = 64, /* Max allowed ep0 packet size */
		.idVendor = VENDOR,
		.idProduct = PRODUCT,
		.bcdDevice = 0x0001, /* Verson of device */
	};

	usbg_gadget_strs g_strs = {
		.str_ser = "0123456789", /* Serial number */
		.str_mnf = "Foo Inc.", /* Manufacturer */
		.str_prd = "Bar Gadget" /* Product string */
	};

	usbg_f_ms_lun_attrs f_ms_luns_array[] = {
		{
			.id = -1, /* allows to place in any position */
			.cdrom = 1,
			.ro = 0,
			.nofua = 0,
			.removable = 1,
			.filename = "",
		}, {
			.id = -1, /* allows to place in any position */
			.cdrom = 0,
			.ro = 0,
			.nofua = 0,
			.removable = 1,
			.filename = argv[1],
		}
	};

	usbg_f_ms_lun_attrs *f_ms_luns[] = {
		/*
		 * When id in lun structure is below 0 we can place it in any
		 * arbitrary position
		 */
		&f_ms_luns_array[1],
		&f_ms_luns_array[0],
		NULL,
	};

	usbg_function_attrs f_attrs = {
		.header.attrs_type = USBG_F_ATTRS_MS,
		.attrs.ms = {
			.stall = 0,
			.nluns = 2,
			.luns = f_ms_luns,
		},
	};

	usbg_config_strs c_strs = {
			"1xMass Storage"
	};

	if (argc < 2) {
		fprintf(stderr, "Usage: gadget-ms file\n");
		goto out1;
	}

	usbg_ret = usbg_init("/sys/kernel/config", &s);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error on USB gadget init\n");
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		goto out1;
	}

	usbg_ret = usbg_create_gadget(s, "g1", &g_attrs, &g_strs, &g);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error on create gadget\n");
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		goto out2;
	}

	usbg_ret = usbg_create_function(g, F_MASS_STORAGE, "my_reader",
					&f_attrs, &f_ms);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error creating mass storage function\n");
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		goto out2;
	}

	/* NULL can be passed to use kernel defaults */
	usbg_ret = usbg_create_config(g, 1, "The only one", NULL, &c_strs, &c);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error creating config\n");
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		goto out2;
	}

	usbg_ret = usbg_add_config_function(c, "some_name_here", f_ms);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error adding ms function\n");
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		goto out2;
	}

	usbg_ret = usbg_enable_gadget(g, DEFAULT_UDC);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error enabling gadget\n");
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		goto out2;
	}

	ret = 0;

out2:
	usbg_cleanup(s);

out1:
	return ret;
}