/* Name: set-led.c
 * Project: custom-class, a basic USB example
 * Author: Christian Starkjohann
 * Creation Date: 2008-04-10
 * Tabsize: 4
 * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
 * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
 */

/*
General Description:
This is the host-side driver for the custom-class example device. It searches
the USB for the LEDControl device and sends the requests understood by this
device.
This program must be linked with libusb on Unix and libusb-win32 on Windows.
See http://libusb.sourceforge.net/ or http://libusb-win32.sourceforge.net/
respectively.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libusb.h>        /* this is libusb */
#include "opendevice.h" /* common code moved to separate module */

#include "../firmware/requests.h"   /* custom request numbers */
#include "../firmware/usbconfig.h"  /* device's VID/PID and names */

static void usage(char *name)
{
    fprintf(stderr, "usage:\n");
    fprintf(stderr, "  %s on ....... turn on LED\n", name);
    fprintf(stderr, "  %s off ...... turn off LED\n", name);
    fprintf(stderr, "  %s status ... ask current status of LED\n", name);
#if ENABLE_TEST
    fprintf(stderr, "  %s test ..... run driver reliability test\n", name);
#endif /* ENABLE_TEST */
}

int main(int argc, char **argv)
{
libusb_device_handle      *handle = NULL;
const unsigned char rawVid[2] = {USB_CFG_VENDOR_ID}, rawPid[2] = {USB_CFG_DEVICE_ID};
char                vendor[] = {USB_CFG_VENDOR_NAME, 0}, product[] = {USB_CFG_DEVICE_NAME, 0};
char                buffer[4];
int                 cnt, vid, pid, isOn, r;

    r = libusb_init(NULL);
    if (0 != r) {
        fprintf(stderr, "Warning: cannot initialize libusb: %s\n", libusb_strerror(r));
        exit(1);
    }
    if(argc < 2){   /* we need at least one argument */
        usage(argv[0]);
        exit(1);
    }
    /* compute VID/PID from usbconfig.h so that there is a central source of information */
    vid = rawVid[1] * 256 + rawVid[0];
    pid = rawPid[1] * 256 + rawPid[0];
    /* The following function is in opendevice.c: */
    if(usbOpenDevice(&handle, vid, vendor, pid, product, NULL, NULL, NULL) != 0){
        fprintf(stderr, "Could not find USB device \"%s\" with vid=0x%x pid=0x%x\n", product, vid, pid);
        exit(1);
    }
    /* Since we use only control endpoint 0, we don't need to choose a
     * configuration and interface. Reading device descriptor and setting a
     * configuration and interface is done through endpoint 0 after all.
     * However, newer versions of Linux require that we claim an interface
     * even for endpoint 0. Enable the following code if your operating system
     * needs it: */
#if 0
    int retries = 1, usbConfiguration = 1, usbInterface = 0;
    r = libusb_set_configuration(handle, usbConfiguration);
    if(r != 0 && showWarnings){
        fprintf(stderr, "Warning: could not set configuration: %s\n", libusb_strerror(r));
    }
    /* now try to claim the interface and detach the kernel HID driver on
     * Linux and other operating systems which support the call. */
    while((len = libusb_claim_interface(handle, usbInterface)) != 0 && retries-- > 0){
#ifdef LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP
        r = libusb_detach_kernel_driver(handle, 0);
        if(r != 0 && showWarnings){
            fprintf(stderr, "Warning: could not detach kernel driver: %s\n", libusb_strerror(r));
        }
#endif
    }
#endif

    if(strcasecmp(argv[1], "status") == 0){
        cnt = libusb_control_transfer(handle, LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_IN, CUSTOM_RQ_GET_STATUS, 0, 0, (unsigned char *)buffer, sizeof(buffer), 5000);
        if(cnt < 1){
            if(cnt < 0){
                fprintf(stderr, "USB error: %s\n", libusb_strerror(cnt));
            }else{
                fprintf(stderr, "only %d bytes received.\n", cnt);
            }
        }else{
            printf("LED is %s\n", buffer[0] ? "on" : "off");
        }
    }else if((isOn = (strcasecmp(argv[1], "on") == 0)) || strcasecmp(argv[1], "off") == 0){
        cnt = libusb_control_transfer(handle, LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT, CUSTOM_RQ_SET_STATUS, isOn, 0, (unsigned char *)buffer, 0, 5000);
        if(cnt < 0){
            fprintf(stderr, "USB error: %s\n", libusb_strerror(cnt));
        }
#if ENABLE_TEST
    }else if(strcasecmp(argv[1], "test") == 0){
        int i;
        srandomdev();
        for(i = 0; i < 50000; i++){
            int value = random() & 0xffff, index = random() & 0xffff;
            int rxValue, rxIndex;
            if((i+1) % 100 == 0){
                fprintf(stderr, "\r%05d", i+1);
                fflush(stderr);
            }
            cnt = libusb_control_transfer(handle, LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | USB_ENDPOINT_IN, CUSTOM_RQ_ECHO, value, index, (unsigned char *)buffer, sizeof(buffer), 5000);
            if(cnt < 0){
                fprintf(stderr, "\nUSB error in iteration %d: %s\n", i, libusb_strerror(cnt));
                break;
            }else if(cnt != 4){
                fprintf(stderr, "\nerror in iteration %d: %d bytes received instead of 4\n", i, cnt);
                break;
            }
            rxValue = ((int)buffer[0] & 0xff) | (((int)buffer[1] & 0xff) << 8);
            rxIndex = ((int)buffer[2] & 0xff) | (((int)buffer[3] & 0xff) << 8);
            if(rxValue != value || rxIndex != index){
                fprintf(stderr, "\ndata error in iteration %d:\n", i);
                fprintf(stderr, "rxValue = 0x%04x value = 0x%04x\n", rxValue, value);
                fprintf(stderr, "rxIndex = 0x%04x index = 0x%04x\n", rxIndex, index);
            }
        }
        fprintf(stderr, "\nTest completed.\n");
#endif /* ENABLE_TEST */
    }else{
        usage(argv[0]);
        exit(1);
    }
    libusb_close(handle);
    return 0;
}