[PATCH] ieee80211: Added ieee80211_geo to provide helper functions

tree 385b391fc0d7c124cd0547fdb6183e9a0c333391
parent 97d7a47f76e72bedde7f402785559ed4c7a8e8e8
author James Ketrenos <jketreno@linux.intel.com> 1124447590 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127313735 -0500

Added ieee80211_geo to provide helper functions to drivers for
implementing supported channel maps.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 143 insertions, 1 deletions

diff --git a/net/ieee80211/Makefile b/net/ieee80211/Makefile
index a6ccac5baea8..f988417121da 100644
--- a/net/ieee80211/Makefile
+++ b/net/ieee80211/Makefile
@@ -7,5 +7,6 @@ ieee80211-objs := \
 	ieee80211_module.o \
 	ieee80211_tx.o \
 	ieee80211_rx.o \
-	ieee80211_wx.o
+	ieee80211_wx.o \
+	ieee80211_geo.o
 
diff --git a/net/ieee80211/ieee80211_geo.c b/net/ieee80211/ieee80211_geo.c
new file mode 100644
index 000000000000..c4b54ef8f6d5
--- /dev/null
+++ b/net/ieee80211/ieee80211_geo.c
@@ -0,0 +1,141 @@
+/******************************************************************************
+
+  Copyright(c) 2005 Intel Corporation. All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms of version 2 of the GNU General Public License as
+  published by the Free Software Foundation.
+
+  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.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc., 59
+  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+  The full GNU General Public License is included in this distribution in the
+  file called LICENSE.
+
+  Contact Information:
+  James P. Ketrenos <ipw2100-admin@linux.intel.com>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+******************************************************************************/
+#include <linux/compiler.h>
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/if_arp.h>
+#include <linux/in6.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/tcp.h>
+#include <linux/types.h>
+#include <linux/version.h>
+#include <linux/wireless.h>
+#include <linux/etherdevice.h>
+#include <asm/uaccess.h>
+
+#include <net/ieee80211.h>
+
+int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
+{
+	int i;
+
+	/* Driver needs to initialize the geography map before using
+	 * these helper functions */
+	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
+
+	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
+		for (i = 0; i < ieee->geo.bg_channels; i++)
+			/* NOTE: If G mode is currently supported but
+			 * this is a B only channel, we don't see it
+			 * as valid. */
+			if ((ieee->geo.bg[i].channel == channel) &&
+			    (!(ieee->mode & IEEE_G) ||
+			     !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
+				return IEEE80211_24GHZ_BAND;
+
+	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
+		for (i = 0; i < ieee->geo.a_channels; i++)
+			if (ieee->geo.a[i].channel == channel)
+				return IEEE80211_52GHZ_BAND;
+
+	return 0;
+}
+
+int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
+{
+	int i;
+
+	/* Driver needs to initialize the geography map before using
+	 * these helper functions */
+	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
+
+	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
+		for (i = 0; i < ieee->geo.bg_channels; i++)
+			if (ieee->geo.bg[i].channel == channel)
+				return i;
+
+	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
+		for (i = 0; i < ieee->geo.a_channels; i++)
+			if (ieee->geo.a[i].channel == channel)
+				return i;
+
+	return -1;
+}
+
+u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
+{
+	int i;
+
+	/* Driver needs to initialize the geography map before using
+	 * these helper functions */
+	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
+
+	freq /= 100000;
+
+	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
+		for (i = 0; i < ieee->geo.bg_channels; i++)
+			if (ieee->geo.bg[i].freq == freq)
+				return ieee->geo.bg[i].channel;
+
+	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
+		for (i = 0; i < ieee->geo.a_channels; i++)
+			if (ieee->geo.a[i].freq == freq)
+				return ieee->geo.a[i].channel;
+
+	return 0;
+}
+
+int ieee80211_set_geo(struct ieee80211_device *ieee,
+		      const struct ieee80211_geo *geo)
+{
+	memcpy(ieee->geo.name, geo->name, 3);
+	ieee->geo.name[3] = '\0';
+	ieee->geo.bg_channels = geo->bg_channels;
+	ieee->geo.a_channels = geo->a_channels;
+	memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
+	       sizeof(struct ieee80211_channel));
+	memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
+	       sizeof(struct ieee80211_channel));
+	return 0;
+}
+
+const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
+{
+	return &ieee->geo;
+}
+
+EXPORT_SYMBOL(ieee80211_is_valid_channel);
+EXPORT_SYMBOL(ieee80211_freq_to_channel);
+EXPORT_SYMBOL(ieee80211_channel_to_index);
+EXPORT_SYMBOL(ieee80211_set_geo);
+EXPORT_SYMBOL(ieee80211_get_geo);