drivers/net/wireless/intel/ipw2x00/libipw_geo.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intel/ipw2x00/libipw_geo.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/ipw2x00/libipw_geo.c
Extension
.c
Size
4774 bytes
Lines
180
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/******************************************************************************

  Copyright(c) 2005 Intel Corporation. All rights reserved.


  Contact Information:
  Intel Linux Wireless <ilw@linux.intel.com>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

******************************************************************************/
#include <linux/compiler.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/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <linux/uaccess.h>

#include "libipw.h"

int libipw_is_valid_channel(struct libipw_device *ieee, u8 channel)
{
	int i;

	/* Driver needs to initialize the geography map before using
	 * these helper functions */
	if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
		return 0;

	if (ieee->freq_band & LIBIPW_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->geo.bg[i].flags & LIBIPW_CH_INVALID) &&
			    (!(ieee->mode & IEEE_G) ||
			     !(ieee->geo.bg[i].flags & LIBIPW_CH_B_ONLY)))
				return LIBIPW_24GHZ_BAND;

	if (ieee->freq_band & LIBIPW_52GHZ_BAND)
		for (i = 0; i < ieee->geo.a_channels; i++)
			if ((ieee->geo.a[i].channel == channel) &&
			    !(ieee->geo.a[i].flags & LIBIPW_CH_INVALID))
				return LIBIPW_52GHZ_BAND;

	return 0;
}

int libipw_channel_to_index(struct libipw_device *ieee, u8 channel)
{
	int i;

	/* Driver needs to initialize the geography map before using
	 * these helper functions */
	if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
		return -1;

	if (ieee->freq_band & LIBIPW_24GHZ_BAND)
		for (i = 0; i < ieee->geo.bg_channels; i++)
			if (ieee->geo.bg[i].channel == channel)
				return i;

	if (ieee->freq_band & LIBIPW_52GHZ_BAND)
		for (i = 0; i < ieee->geo.a_channels; i++)
			if (ieee->geo.a[i].channel == channel)
				return i;

	return -1;
}

u32 libipw_channel_to_freq(struct libipw_device * ieee, u8 channel)
{
	const struct libipw_channel * ch;

	/* Driver needs to initialize the geography map before using
	 * these helper functions */
	if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
		return 0;

Annotation

Implementation Notes