/*
 * Copyright (C) 2013 Linaro Limited
 *
 * Matt Porter <mporter@linaro.org>
 *
 * Copyright (C) 2013 - 2015 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.
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/sysmacros.h>
#include <netinet/ether.h>
#include <usbg/usbg.h>
#include <usbg/function/ms.h>
#include <usbg/function/net.h>
#include <usbg/function/ffs.h>
#include <usbg/function/phonet.h>
#include <usbg/function/midi.h>
#include <usbg/function/hid.h>
#include <usbg/function/uac2.h>

/**
 * @file show-gadgets.c
 * @example show-gadgets.c
 * This example shows how to display all configured USB gadgets
 * in the system
 */

void show_gadget_strs(usbg_gadget *g, int lang)
{
	int usbg_ret;
	struct usbg_gadget_strs g_strs;

	usbg_ret = usbg_get_gadget_strs(g, lang, &g_strs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		return;
	}
	fprintf(stdout, "  Language: \t0x%x\n", lang);
	fprintf(stdout, "    Manufacturer\t%s\n", g_strs.manufacturer);
	fprintf(stdout, "    Product\t\t%s\n", g_strs.product);
	fprintf(stdout, "    Serial Number\t%s\n", g_strs.serial);

	usbg_free_gadget_strs(&g_strs);
}

void show_gadget(usbg_gadget *g)
{
	const char *name, *udc;
	usbg_udc *u;
	int usbg_ret;
	struct usbg_gadget_attrs g_attrs;
	int *langs;
	int i;

	name = usbg_get_gadget_name(g);
	if (!name) {
		fprintf(stderr, "Unable to get gadget name\n");
		return;
	}

	usbg_ret = usbg_get_gadget_attrs(g, &g_attrs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
			usbg_strerror(usbg_ret));
		return;
	}

	fprintf(stdout, "ID %04x:%04x '%s'\n",
			g_attrs.idVendor, g_attrs.idProduct, name);

	u = usbg_get_gadget_udc(g);
	if (u)
		/* gadget is enabled */
		udc = usbg_get_udc_name(u);
	else
		/* gadget is disabled */
		udc = "\0";

	fprintf(stdout, "  UDC\t\t\t%s\n", udc);

	fprintf(stdout, "  bcdUSB\t\t%x.%02x\n",
		g_attrs.bcdUSB >> 8,
		g_attrs.bcdUSB & 0x00ff);

	fprintf(stdout, "  bDeviceClass\t\t0x%02x\n", g_attrs.bDeviceClass);
	fprintf(stdout, "  bDeviceSubClass\t0x%02x\n", g_attrs.bDeviceSubClass);
	fprintf(stdout, "  bDeviceProtocol\t0x%02x\n", g_attrs.bDeviceProtocol);
	fprintf(stdout, "  bMaxPacketSize0\t%d\n", g_attrs.bMaxPacketSize0);
	fprintf(stdout, "  idVendor\t\t0x%04x\n", g_attrs.idVendor);
	fprintf(stdout, "  idProduct\t\t0x%04x\n", g_attrs.idProduct);
	fprintf(stdout, "  bcdDevice\t\t%x.%02x\n",
		g_attrs.bcdDevice >> 8,
		g_attrs.bcdDevice & 0x00ff);

	usbg_ret = usbg_get_gadget_strs_langs(g, &langs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
			usbg_strerror(usbg_ret));
		return;
	}

	for (i = 0; langs[i]; ++i)
		show_gadget_strs(g, langs[i]);
}

void show_function(usbg_function *f)
{
	const char *instance;
	usbg_function_type type;
	int usbg_ret;
	union {
		struct usbg_f_net_attrs net;
		char *ffs_dev_name;
		struct usbg_f_ms_attrs ms;
		struct usbg_f_midi_attrs midi;
		int serial_port_num;
		char *phonet_ifname;
		struct usbg_f_hid_attrs hid;
		struct usbg_f_uac2_attrs uac2;
	} f_attrs;

	instance = usbg_get_function_instance(f);
	if (!instance) {
		fprintf(stderr, "Unable to get function instance name\n");
		return;
	}

	type = usbg_get_function_type(f);
	usbg_ret = usbg_get_function_attrs(f, &f_attrs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		return;
	}

	fprintf(stdout, "  Function, type: %s instance: %s\n",
			usbg_get_function_type_str(type), instance);

	switch (type) {
	case USBG_F_ACM:
	case USBG_F_OBEX:
	case USBG_F_SERIAL:
		fprintf(stdout, "    port_num\t\t%d\n",
				f_attrs.serial_port_num);
		break;

	case USBG_F_ECM:
	case USBG_F_SUBSET:
	case USBG_F_NCM:
	case USBG_F_EEM:
	case USBG_F_RNDIS:
	{
		struct usbg_f_net_attrs *f_net_attrs = &f_attrs.net;

		fprintf(stdout, "    dev_addr\t\t%s\n",
			ether_ntoa(&f_net_attrs->dev_addr));
		fprintf(stdout, "    host_addr\t\t%s\n",
			ether_ntoa(&f_net_attrs->host_addr));
		fprintf(stdout, "    ifname\t\t%s\n", f_net_attrs->ifname);
		fprintf(stdout, "    qmult\t\t%d\n", f_net_attrs->qmult);
		break;
	}

	case USBG_F_PHONET:
		fprintf(stdout, "    ifname\t\t%s\n", f_attrs.phonet_ifname);
		break;

	case USBG_F_FFS:
		fprintf(stdout, "    dev_name\t\t%s\n", f_attrs.ffs_dev_name);
		break;

	case USBG_F_MASS_STORAGE:
	{
		struct usbg_f_ms_attrs *attrs = &f_attrs.ms;
		int i;

		fprintf(stdout, "    stall\t\t%d\n", attrs->stall);
		fprintf(stdout, "    nluns\t\t%d\n", attrs->nluns);
		for (i = 0; i < attrs->nluns; ++i) {
			fprintf(stdout, "    lun %d:\n", attrs->luns[i]->id);
			fprintf(stdout, "      cdrom\t\t%d\n", attrs->luns[i]->cdrom);
			fprintf(stdout, "      ro\t\t%d\n", attrs->luns[i]->ro);
			fprintf(stdout, "      nofua\t\t%d\n", attrs->luns[i]->nofua);
			fprintf(stdout, "      removable\t\t%d\n", attrs->luns[i]->removable);
			fprintf(stdout, "      file\t\t%s\n", attrs->luns[i]->file);
			fprintf(stdout, "      inquiry_string\t\t%s\n", attrs->luns[i]->inquiry_string);
		}
		break;
	}

	case USBG_F_MIDI:
	{
		struct usbg_f_midi_attrs *attrs = &f_attrs.midi;

		fprintf(stdout, "    index\t\t%d\n", attrs->index);
		fprintf(stdout, "    id\t\t\t%s\n", attrs->id);
		fprintf(stdout, "    in_ports\t\t%d\n", attrs->in_ports);
		fprintf(stdout, "    out_ports\t\t%d\n", attrs->out_ports);
		fprintf(stdout, "    buflen\t\t%d\n", attrs->buflen);
		fprintf(stdout, "    qlen\t\t%d\n", attrs->qlen);
		break;
	}
	case USBG_F_HID:
	{
		struct usbg_f_hid_attrs *attrs = &f_attrs.hid;
		int i;

		fprintf(stdout, "    dev\t\t\t%d:%d\n",
			major(attrs->dev), minor(attrs->dev));
		fprintf(stdout, "    protocol\t\t%d\n", attrs->protocol);
		fprintf(stdout, "    report_desc\t");
		for (i = 0; i < attrs->report_desc.len; ++i)
			fprintf(stdout, "%x", attrs->report_desc.desc[i]);
		fprintf(stdout, "\n");
		fprintf(stdout, "    report_length\t%d\n",
			attrs->report_length);
		fprintf(stdout, "    subclass\t\t%d\n", attrs->subclass);
		break;
	}

	case USBG_F_UAC2:
	{
		struct usbg_f_uac2_attrs *attrs = &f_attrs.uac2;

		fprintf(stdout, "    c_chmask\t\t%d\n", attrs->c_chmask);
		fprintf(stdout, "    c_srate\t\t%d\n", attrs->c_srate);
		fprintf(stdout, "    c_ssize\t\t%d\n", attrs->c_ssize);
		fprintf(stdout, "    p_chmask\t\t%d\n", attrs->p_chmask);
		fprintf(stdout, "    p_srate\t\t%d\n", attrs->p_srate);
		fprintf(stdout, "    p_ssize\t\t%d\n", attrs->p_ssize);
		break;
	}

	default:
		fprintf(stdout, "    UNKNOWN\n");
	}

	usbg_cleanup_function_attrs(f, &f_attrs);
}

void show_config_strs(usbg_config *c, int lang)
{
	struct usbg_config_strs c_strs;
	int usbg_ret;

	usbg_ret = usbg_get_config_strs(c, lang, &c_strs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		return;
	}

	fprintf(stdout, "    Language: \t0x%x\n", lang);
	fprintf(stdout, "      configuration\t%s\n", c_strs.configuration);

	usbg_free_config_strs(&c_strs);
}

void show_config(usbg_config *c)
{
	usbg_binding *b;
	usbg_function *f;
	const char *label, *instance, *bname;
	usbg_function_type type;
	struct usbg_config_attrs c_attrs;
	int *langs;
	int usbg_ret, id, i;

	label = usbg_get_config_label(c);
	if (!label) {
		fprintf(stderr, "Unable to get config label\n");
		return;
	}

	id = usbg_get_config_id(c);
	fprintf(stdout, "  Configuration: '%s' ID: %d\n", label, id);

	usbg_ret = usbg_get_config_attrs(c, &c_attrs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		return;
	}

	fprintf(stdout, "    MaxPower\t\t%d\n", c_attrs.bMaxPower);
	fprintf(stdout, "    bmAttributes\t0x%02x\n", c_attrs.bmAttributes);

	usbg_ret = usbg_get_config_strs_langs(c, &langs);
	if (usbg_ret != USBG_SUCCESS) {
		fprintf(stderr, "Error: %s : %s\n", usbg_error_name(usbg_ret),
				usbg_strerror(usbg_ret));
		return;
	}

	for (i = 0; langs[i]; ++i)
		show_config_strs(c, langs[i]);

	usbg_for_each_binding(b, c) {
		bname = usbg_get_binding_name(b);
		f = usbg_get_binding_target(b);
		instance = usbg_get_function_instance(f);
		type = usbg_get_function_type(f);
		if (!bname || !instance) {
			fprintf(stderr, "Unable to get binding details\n");
			return;
		}
		fprintf(stdout, "    %s -> %s %s\n", bname,
				usbg_get_function_type_str(type), instance);
	}
}

int main(void)
{
	usbg_state *s;
	usbg_gadget *g;
	usbg_function *f;
	usbg_config *c;
	int usbg_ret;

	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));
		return -EINVAL;
	}

	usbg_for_each_gadget(g, s) {
		show_gadget(g);
		usbg_for_each_function(f, g)
			show_function(f);
		usbg_for_each_config(c, g)
			show_config(c);
	}

	usbg_cleanup(s);

	return 0;
}