/*
 * Misc utility routines used by kernel or app-level.
 * Contents are wifi-specific, used by any kernel or app-level
 * software that might want wifi things as it grows.
 *
 * Copyright (C) 1999-2011, Broadcom Corporation
 * 
 *         Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 * 
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 * 
 *      Notwithstanding the above, under no circumstances may you combine this
 * software in any way with any other Broadcom software provided under a license
 * other than the GPL, without Broadcom's express prior written consent.
 * $Id: bcmwifi.c,v 1.31.8.1 2010-08-03 17:47:05 Exp $
 */


#include <typedefs.h>

#ifdef BCMDRIVER
#include <osl.h>
#include <bcmutils.h>
#define strtoul(nptr, endptr, base) bcm_strtoul((nptr), (endptr), (base))
#define tolower(c) (bcm_isupper((c)) ? ((c) + 'a' - 'A') : (c))
#else
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#ifndef ASSERT
#define ASSERT(exp)
#endif
#endif 
#include <bcmwifi.h>

#if defined(WIN32) && (defined(BCMDLL) || defined(WLMDLL))
#include <bcmstdlib.h> 	
#endif


char *
wf_chspec_ntoa(chanspec_t chspec, char *buf)
{
	const char *band, *bw, *sb;
	uint channel;

	band = "";
	bw = "";
	sb = "";
	channel = CHSPEC_CHANNEL(chspec);
	
	if ((CHSPEC_IS2G(chspec) && channel > CH_MAX_2G_CHANNEL) ||
	    (CHSPEC_IS5G(chspec) && channel <= CH_MAX_2G_CHANNEL))
		band = (CHSPEC_IS2G(chspec)) ? "b" : "a";
	if (CHSPEC_IS40(chspec)) {
		if (CHSPEC_SB_UPPER(chspec)) {
			sb = "u";
			channel += CH_10MHZ_APART;
		} else {
			sb = "l";
			channel -= CH_10MHZ_APART;
		}
	} else if (CHSPEC_IS10(chspec)) {
		bw = "n";
	}

	
	snprintf(buf, 6, "%d%s%s%s", channel, band, bw, sb);
	return (buf);
}


chanspec_t
wf_chspec_aton(char *a)
{
	char *endp = NULL;
	uint channel, band, bw, ctl_sb;
	char c;

	channel = strtoul(a, &endp, 10);

	
	if (endp == a)
		return 0;

	if (channel > MAXCHANNEL)
		return 0;

	band = ((channel <= CH_MAX_2G_CHANNEL) ? WL_CHANSPEC_BAND_2G : WL_CHANSPEC_BAND_5G);
	bw = WL_CHANSPEC_BW_20;
	ctl_sb = WL_CHANSPEC_CTL_SB_NONE;

	a = endp;

	c = tolower(a[0]);
	if (c == '\0')
		goto done;

	
	if (c == 'a' || c == 'b') {
		band = (c == 'a') ? WL_CHANSPEC_BAND_5G : WL_CHANSPEC_BAND_2G;
		a++;
		c = tolower(a[0]);
		if (c == '\0')
			goto done;
	}

	
	if (c == 'n') {
		bw = WL_CHANSPEC_BW_10;
	} else if (c == 'l') {
		bw = WL_CHANSPEC_BW_40;
		ctl_sb = WL_CHANSPEC_CTL_SB_LOWER;
		
		if (channel <= (MAXCHANNEL - CH_20MHZ_APART))
			channel += CH_10MHZ_APART;
		else
			return 0;
	} else if (c == 'u') {
		bw = WL_CHANSPEC_BW_40;
		ctl_sb = WL_CHANSPEC_CTL_SB_UPPER;
		
		if (channel > CH_20MHZ_APART)
			channel -= CH_10MHZ_APART;
		else
			return 0;
	} else {
		return 0;
	}

done:
	return (channel | band | bw | ctl_sb);
}


bool
wf_chspec_malformed(chanspec_t chanspec)
{
	
	if (!CHSPEC_IS5G(chanspec) && !CHSPEC_IS2G(chanspec))
		return TRUE;
	
	if (!CHSPEC_IS40(chanspec) && !CHSPEC_IS20(chanspec))
		return TRUE;

	
	if (CHSPEC_IS20_UNCOND(chanspec)) {
		if (!CHSPEC_SB_NONE(chanspec))
			return TRUE;
	} else {
		if (!CHSPEC_SB_UPPER(chanspec) && !CHSPEC_SB_LOWER(chanspec))
		return TRUE;
	}

	return FALSE;
}


uint8
wf_chspec_ctlchan(chanspec_t chspec)
{
	uint8 ctl_chan;

	
	if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_NONE) {
		return CHSPEC_CHANNEL(chspec);
	} else {
		
		ASSERT(CHSPEC_BW(chspec) == WL_CHANSPEC_BW_40);
		
		if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_UPPER) {
			
			ctl_chan = UPPER_20_SB(CHSPEC_CHANNEL(chspec));
		} else {
			ASSERT(CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_LOWER);
			
			ctl_chan = LOWER_20_SB(CHSPEC_CHANNEL(chspec));
		}
	}

	return ctl_chan;
}

chanspec_t
wf_chspec_ctlchspec(chanspec_t chspec)
{
	chanspec_t ctl_chspec = 0;
	uint8 channel;

	ASSERT(!wf_chspec_malformed(chspec));

	
	if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_NONE) {
		return chspec;
	} else {
		if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_UPPER) {
			channel = UPPER_20_SB(CHSPEC_CHANNEL(chspec));
		} else {
			channel = LOWER_20_SB(CHSPEC_CHANNEL(chspec));
		}
		ctl_chspec = channel | WL_CHANSPEC_BW_20 | WL_CHANSPEC_CTL_SB_NONE;
		ctl_chspec |= CHSPEC_BAND(chspec);
	}
	return ctl_chspec;
}


int
wf_mhz2channel(uint freq, uint start_factor)
{
	int ch = -1;
	uint base;
	int offset;

	
	if (start_factor == 0) {
		if (freq >= 2400 && freq <= 2500)
			start_factor = WF_CHAN_FACTOR_2_4_G;
		else if (freq >= 5000 && freq <= 6000)
			start_factor = WF_CHAN_FACTOR_5_G;
	}

	if (freq == 2484 && start_factor == WF_CHAN_FACTOR_2_4_G)
		return 14;

	base = start_factor / 2;

	
	if ((freq < base) || (freq > base + 1000))
		return -1;

	offset = freq - base;
	ch = offset / 5;

	
	if (offset != (ch * 5))
		return -1;

	
	if (start_factor == WF_CHAN_FACTOR_2_4_G && (ch < 1 || ch > 13))
		return -1;

	return ch;
}


int
wf_channel2mhz(uint ch, uint start_factor)
{
	int freq;

	if ((start_factor == WF_CHAN_FACTOR_2_4_G && (ch < 1 || ch > 14)) ||
	    (ch > 200))
		freq = -1;
	else if ((start_factor == WF_CHAN_FACTOR_2_4_G) && (ch == 14))
		freq = 2484;
	else
		freq = ch * 5 + start_factor / 2;

	return freq;
}