/* -*- c++ -*- */
/*
 * Copyright 2003,2004,2006,2009 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio 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, or (at your option)
 * any later version.
 * 
 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "usrp/usrp_prims.h"
#include "usrp_commands.h"
#include "usrp_ids.h"
#include "usrp_i2c_addr.h"
#include "fpga_regs_common.h"
#include "fpga_regs_standard.h"
#include <usb.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>		// FIXME should check with autoconf (nanosleep)
#include <algorithm>
#include <ad9862.h>
#include <assert.h>

extern "C" {
#include "md5.h"
};

#define VERBOSE 0

using namespace ad9862;

static const int FIRMWARE_HASH_SLOT	= 0;
static const int FPGA_HASH_SLOT 	= 1;

static const int hash_slot_addr[2] = {
  USRP_HASH_SLOT_0_ADDR,
  USRP_HASH_SLOT_1_ADDR
};

static const char *default_firmware_filename = "std.ihx";
static const char *default_fpga_filename     = "std_2rxhb_2tx.rbf";

#include "std_paths.h"
#include <stdio.h>

void
usrp_one_time_init (libusb_context **ctx)
{
  static bool first = true;

  if (first) {
    first = false;
    usb_init ();			// usb library init
    usb_find_busses ();
    usb_find_devices ();
  }
}

void
usrp_rescan ()
{
  usb_find_busses ();
  usb_find_devices ();
}

// ----------------------------------------------------------------

/*
 * q must be a real USRP, not an FX2.  Return its hardware rev number.
 */
int
usrp_hw_rev (struct usb_device *q)
{
  return q->descriptor.bcdDevice & 0x00FF;
}

/*
 * q must be a real USRP, not an FX2.  Return true if it's configured.
 */
bool
_usrp_configured_p (struct usb_device *q)
{
  return (q->descriptor.bcdDevice & 0xFF00) != 0;
}

bool
usrp_usrp_p (struct usb_device *q)
{
  return (q->descriptor.idVendor == USB_VID_FSF
	  && q->descriptor.idProduct == USB_PID_FSF_USRP);
}

bool
usrp_fx2_p (struct usb_device *q)
{
  return (q->descriptor.idVendor == USB_VID_CYPRESS
	  && q->descriptor.idProduct == USB_PID_CYPRESS_FX2);
}

// ----------------------------------------------------------------

struct usb_device *
usrp_find_device (int nth, bool fx2_ok_p, libusb_context *ctx)
{
  struct usb_bus *p;
  struct usb_device *q;
  int	 n_found = 0;

  usrp_one_time_init ();
  
  p = usb_get_busses();
  while (p != NULL){
    q = p->devices;
    while (q != NULL){
      if (usrp_usrp_p (q) || (fx2_ok_p && usrp_fx2_p (q))){
	if (n_found == nth)	// return this one
	  return q;
	n_found++;		// keep looking
      }
      q = q->next;
    }
    p = p->next;
  }
  return 0;	// not found
}

struct usb_dev_handle *
usrp_open_interface (struct usb_device *dev, int interface, int altinterface)
{
  struct usb_dev_handle *udh = usb_open (dev);
  if (udh == 0)
    return 0;

  if (dev != usb_device (udh)){
    fprintf (stderr, "%s:%d: internal error!\n", __FILE__, __LINE__);
    abort ();
  }

#if defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
  // There's no get get_configuration function, and with some of the newer kernels
  // setting the configuration, even if to the same value, hoses any other processes
  // that have it open.  Hence we opt to not set it at all (We've only
  // got a single configuration anyway).  This may hose the win32 stuff...

  // Appears to be required for libusb-win32 and Cygwin -- dew 09/20/06
  if (usb_set_configuration (udh, 1) < 0){
    /*
     * Ignore this error.  
     *
     * Seems that something changed in drivers/usb/core/devio.c:proc_setconfig such that
     * it returns -EBUSY if _any_ of the interfaces of a device are open.
     * We've only got a single configuration, so setting it doesn't even seem
     * like it should be required.
     */
  }
#endif

  if (usb_claim_interface (udh, interface) < 0){
    fprintf (stderr, "%s:usb_claim_interface: failed interface %d\n", __FUNCTION__,interface);
    fprintf (stderr, "%s\n", usb_strerror());
    usb_close (udh);
    return 0;
  }

  if (usb_set_altinterface (udh, altinterface) < 0){
    fprintf (stderr, "%s:usb_set_alt_interface: failed\n", __FUNCTION__);
    fprintf (stderr, "%s\n", usb_strerror());
    usb_release_interface (udh, interface);
    usb_close (udh);
    return 0;
  }

  return udh;
}

bool
usrp_close_interface (struct usb_dev_handle *udh)
{
  // we're assuming that closing an interface automatically releases it.
  return usb_close (udh) == 0;
}

// ----------------------------------------------------------------
// write internal ram using Cypress vendor extension

bool
write_internal_ram (struct usb_dev_handle *udh, unsigned char *buf,
		    int start_addr, size_t len)
{
  int addr;
  int n;
  int a;
  int quanta = MAX_EP0_PKTSIZE;

  for (addr = start_addr; addr < start_addr + (int) len; addr += quanta){
    n = len + start_addr - addr;
    if (n > quanta)
      n = quanta;

    a = usb_control_msg (udh, 0x40, 0xA0,
			 addr, 0, (char *)(buf + (addr - start_addr)), n, 1000);

    if (a < 0){
      fprintf(stderr,"write_internal_ram failed: %s\n", usb_strerror());
      return false;
    }
  }
  return true;
}


// ----------------------------------------------------------------
// write vendor extension command to USRP

int
write_cmd (struct usb_dev_handle *udh,
	   int request, int value, int index,
	   unsigned char *bytes, int len)
{
  int	requesttype = (request & 0x80) ? VRT_VENDOR_IN : VRT_VENDOR_OUT;

  int r = usb_control_msg (udh, requesttype, request, value, index,
			   (char *) bytes, len, 1000);
  if (r < 0){
    // we get EPIPE if the firmware stalls the endpoint.
    if (errno != EPIPE)
      fprintf (stderr, "usb_control_msg failed: %s\n", usb_strerror ());
  }

  return r;
}


bool
usrp_set_hash (struct usb_dev_handle *udh, int which,
	       const unsigned char hash[USRP_HASH_SIZE])
{
  which &= 1;
  
  // we use the Cypress firmware down load command to jam it in.
  int r = usb_control_msg (udh, 0x40, 0xa0, hash_slot_addr[which], 0,
			   (char *) hash, USRP_HASH_SIZE, 1000);
  return r == USRP_HASH_SIZE;
}

bool
usrp_get_hash (struct usb_dev_handle *udh, int which, 
	       unsigned char hash[USRP_HASH_SIZE])
{
  which &= 1;
  
  // we use the Cypress firmware upload command to fetch it.
  int r = usb_control_msg (udh, 0xc0, 0xa0, hash_slot_addr[which], 0,
			   (char *) hash, USRP_HASH_SIZE, 1000);
  return r == USRP_HASH_SIZE;
}

bool
usrp_write_fpga_reg (struct usb_dev_handle *udh, int reg, int value)
{
  switch (usrp_hw_rev (usb_device (udh))){
  case 0:			// not supported ;)
    abort();	

  default:
    return usrp1_fpga_write (udh, reg, value);
  }
}

bool
usrp_read_fpga_reg (struct usb_dev_handle *udh, int reg, int *value)
{
  switch (usrp_hw_rev (usb_device (udh))){
  case 0:		// not supported ;)
    abort();
    
  default:
    return usrp1_fpga_read (udh, reg, value);
  }
}


void
power_down_9862s (struct usb_dev_handle *udh)
{
  static const unsigned char regs[] = {
    REG_RX_PWR_DN,      0x01,              // everything
    REG_TX_PWR_DN,      0x0f,              // pwr dn digital and analog_both
    REG_TX_MODULATOR,   0x00               // coarse & fine modulators disabled
  };

  switch (usrp_hw_rev (usb_device (udh))){
  case 0:
    break;

  default:
    usrp_9862_write_many_all (udh, regs, sizeof (regs));
    break;
  }
}

// ----------------------------------------------------------------

std::string
usrp_serial_number(struct usb_dev_handle *udh)
{
  unsigned char iserial = usb_device(udh)->descriptor.iSerialNumber;
  if (iserial == 0)
    return "";

  char buf[1024];
  if (usb_get_string_simple(udh, iserial, buf, sizeof(buf)) < 0)
    return "";

  return buf;
}