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wireless: Add channel/frequency conversions to ieee80211.h
Added mappings for FHSS, DSSS and OFDM channels - with macros to point HR DSSS and ERP to the DSSS mappings. Currently just static inline functions. Use the new functions in the older fullmac drivers. This eliminates a number of const static buffers and removes a couple of range checks that are now redundant. Signed-off-by: David Kilroy <kilroyd@googlemail.com> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Richard Farina <sidhayn@gmail.com> Acked-by: Jeroen Vreeken <pe1rxq@amsat.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
David Kilroy
John W. Linville
parent
eaee7cc2c1
commit
9ee677c227
7 changed files with 155 additions and 68 deletions
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@ -1070,10 +1070,6 @@ static WifiCtlHdr wifictlhdr8023 = {
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}
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};
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// Frequency list (map channels to frequencies)
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static const long frequency_list[] = { 2412, 2417, 2422, 2427, 2432, 2437, 2442,
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2447, 2452, 2457, 2462, 2467, 2472, 2484 };
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// A few details needed for WEP (Wireless Equivalent Privacy)
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#define MAX_KEY_SIZE 13 // 128 (?) bits
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#define MIN_KEY_SIZE 5 // 40 bits RC4 - WEP
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@ -5725,16 +5721,12 @@ static int airo_set_freq(struct net_device *dev,
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int rc = -EINPROGRESS; /* Call commit handler */
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/* If setting by frequency, convert to a channel */
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if((fwrq->e == 1) &&
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(fwrq->m >= (int) 2.412e8) &&
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(fwrq->m <= (int) 2.487e8)) {
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if(fwrq->e == 1) {
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int f = fwrq->m / 100000;
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int c = 0;
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while((c < 14) && (f != frequency_list[c]))
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c++;
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/* Hack to fall through... */
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fwrq->e = 0;
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fwrq->m = c + 1;
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fwrq->m = ieee80211_freq_to_dsss_chan(f);
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}
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/* Setting by channel number */
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if((fwrq->m > 1000) || (fwrq->e > 0))
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@ -5778,7 +5770,7 @@ static int airo_get_freq(struct net_device *dev,
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ch = le16_to_cpu(status_rid.channel);
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if((ch > 0) && (ch < 15)) {
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fwrq->m = frequency_list[ch - 1] * 100000;
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fwrq->m = ieee80211_dsss_chan_to_freq(ch) * 100000;
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fwrq->e = 1;
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} else {
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fwrq->m = ch;
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@ -6795,8 +6787,8 @@ static int airo_get_range(struct net_device *dev,
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k = 0;
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for(i = 0; i < 14; i++) {
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range->freq[k].i = i + 1; /* List index */
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range->freq[k].m = frequency_list[i] * 100000;
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range->freq[k++].e = 1; /* Values in table in MHz -> * 10^5 * 10 */
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range->freq[k].m = ieee80211_dsss_chan_to_freq(i + 1) * 100000;
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range->freq[k++].e = 1; /* Values in MHz -> * 10^5 * 10 */
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}
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range->num_frequency = k;
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@ -7189,10 +7181,7 @@ static inline char *airo_translate_scan(struct net_device *dev,
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/* Add frequency */
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iwe.cmd = SIOCGIWFREQ;
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iwe.u.freq.m = le16_to_cpu(bss->dsChannel);
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/* iwe.u.freq.m containt the channel (starting 1), our
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* frequency_list array start at index 0...
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*/
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iwe.u.freq.m = frequency_list[iwe.u.freq.m - 1] * 100000;
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iwe.u.freq.m = ieee80211_dsss_chan_to_freq(iwe.u.freq.m) * 100000;
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iwe.u.freq.e = 1;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf,
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&iwe, IW_EV_FREQ_LEN);
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@ -2204,9 +2204,6 @@ static int atmel_get_frag(struct net_device *dev,
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return 0;
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}
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static const long frequency_list[] = { 2412, 2417, 2422, 2427, 2432, 2437, 2442,
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2447, 2452, 2457, 2462, 2467, 2472, 2484 };
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static int atmel_set_freq(struct net_device *dev,
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struct iw_request_info *info,
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struct iw_freq *fwrq,
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@ -2216,16 +2213,12 @@ static int atmel_set_freq(struct net_device *dev,
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int rc = -EINPROGRESS; /* Call commit handler */
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/* If setting by frequency, convert to a channel */
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if ((fwrq->e == 1) &&
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(fwrq->m >= (int) 241200000) &&
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(fwrq->m <= (int) 248700000)) {
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if (fwrq->e == 1) {
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int f = fwrq->m / 100000;
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int c = 0;
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while ((c < 14) && (f != frequency_list[c]))
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c++;
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/* Hack to fall through... */
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fwrq->e = 0;
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fwrq->m = c + 1;
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fwrq->m = ieee80211_freq_to_dsss_chan(f);
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}
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/* Setting by channel number */
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if ((fwrq->m > 1000) || (fwrq->e > 0))
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@ -2384,8 +2377,11 @@ static int atmel_get_range(struct net_device *dev,
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if (range->num_channels != 0) {
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for (k = 0, i = channel_table[j].min; i <= channel_table[j].max; i++) {
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range->freq[k].i = i; /* List index */
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range->freq[k].m = frequency_list[i - 1] * 100000;
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range->freq[k++].e = 1; /* Values in table in MHz -> * 10^5 * 10 */
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/* Values in MHz -> * 10^5 * 10 */
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range->freq[k].m = (ieee80211_dsss_chan_to_freq(i) *
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100000);
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range->freq[k++].e = 1;
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}
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range->num_frequency = k;
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}
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@ -178,12 +178,7 @@ static const struct ethtool_ops orinoco_ethtool_ops;
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/* Data tables */
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/********************************************************************/
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/* The frequency of each channel in MHz */
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static const long channel_frequency[] = {
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2412, 2417, 2422, 2427, 2432, 2437, 2442,
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2447, 2452, 2457, 2462, 2467, 2472, 2484
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};
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#define NUM_CHANNELS ARRAY_SIZE(channel_frequency)
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#define NUM_CHANNELS 14
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/* This tables gives the actual meanings of the bitrate IDs returned
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* by the firmware. */
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@ -3742,13 +3737,13 @@ static int orinoco_hw_get_essid(struct orinoco_private *priv, int *active,
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return err;
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}
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static long orinoco_hw_get_freq(struct orinoco_private *priv)
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static int orinoco_hw_get_freq(struct orinoco_private *priv)
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{
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hermes_t *hw = &priv->hw;
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int err = 0;
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u16 channel;
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long freq = 0;
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int freq = 0;
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unsigned long flags;
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if (orinoco_lock(priv, &flags) != 0)
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@ -3771,7 +3766,7 @@ static long orinoco_hw_get_freq(struct orinoco_private *priv)
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goto out;
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}
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freq = channel_frequency[channel-1] * 100000;
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freq = ieee80211_dsss_chan_to_freq(channel);
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out:
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orinoco_unlock(priv, &flags);
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@ -3998,7 +3993,8 @@ static int orinoco_ioctl_getiwrange(struct net_device *dev,
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for (i = 0; i < NUM_CHANNELS; i++) {
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if (priv->channel_mask & (1 << i)) {
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range->freq[k].i = i + 1;
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range->freq[k].m = channel_frequency[i] * 100000;
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range->freq[k].m = (ieee80211_dsss_chan_to_freq(i + 1) *
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100000);
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range->freq[k].e = 1;
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k++;
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}
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@ -4346,16 +4342,15 @@ static int orinoco_ioctl_setfreq(struct net_device *dev,
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/* Setting by channel number */
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chan = frq->m;
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} else {
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/* Setting by frequency - search the table */
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int mult = 1;
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/* Setting by frequency */
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int denom = 1;
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int i;
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/* Calculate denominator to rescale to MHz */
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for (i = 0; i < (6 - frq->e); i++)
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mult *= 10;
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denom *= 10;
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for (i = 0; i < NUM_CHANNELS; i++)
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if (frq->m == (channel_frequency[i] * mult))
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chan = i+1;
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chan = ieee80211_freq_to_dsss_chan(frq->m / denom);
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}
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if ( (chan < 1) || (chan > NUM_CHANNELS) ||
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@ -4392,7 +4387,7 @@ static int orinoco_ioctl_getfreq(struct net_device *dev,
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return tmp;
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}
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frq->m = tmp;
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frq->m = tmp * 100000;
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frq->e = 1;
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return 0;
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@ -5609,7 +5604,7 @@ static inline char *orinoco_translate_scan(struct net_device *dev,
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current_ev = iwe_stream_add_event(info, current_ev, end_buf,
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&iwe, IW_EV_FREQ_LEN);
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iwe.u.freq.m = channel_frequency[channel-1] * 100000;
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iwe.u.freq.m = ieee80211_dsss_chan_to_freq(channel) * 100000;
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iwe.u.freq.e = 1;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf,
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&iwe, IW_EV_FREQ_LEN);
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@ -5760,7 +5755,7 @@ static inline char *orinoco_translate_ext_scan(struct net_device *dev,
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current_ev = iwe_stream_add_event(info, current_ev, end_buf,
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&iwe, IW_EV_FREQ_LEN);
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iwe.u.freq.m = channel_frequency[channel-1] * 100000;
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iwe.u.freq.m = ieee80211_dsss_chan_to_freq(channel) * 100000;
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iwe.u.freq.e = 1;
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current_ev = iwe_stream_add_event(info, current_ev, end_buf,
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&iwe, IW_EV_FREQ_LEN);
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@ -369,9 +369,6 @@ struct rndis_wext_private {
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};
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static const int freq_chan[] = { 2412, 2417, 2422, 2427, 2432, 2437, 2442,
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2447, 2452, 2457, 2462, 2467, 2472, 2484 };
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static const int rates_80211g[8] = { 6, 9, 12, 18, 24, 36, 48, 54 };
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static const int bcm4320_power_output[4] = { 25, 50, 75, 100 };
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@ -640,8 +637,8 @@ static void dsconfig_to_freq(unsigned int dsconfig, struct iw_freq *freq)
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static int freq_to_dsconfig(struct iw_freq *freq, unsigned int *dsconfig)
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{
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if (freq->m < 1000 && freq->e == 0) {
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if (freq->m >= 1 && freq->m <= ARRAY_SIZE(freq_chan))
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*dsconfig = freq_chan[freq->m - 1] * 1000;
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if (freq->m >= 1 && freq->m <= 14)
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*dsconfig = ieee80211_dsss_chan_to_freq(freq->m) * 1000;
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else
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return -1;
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} else {
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@ -1178,11 +1175,11 @@ static int rndis_iw_get_range(struct net_device *dev,
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range->throughput = 11 * 1000 * 1000 / 2;
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}
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range->num_channels = ARRAY_SIZE(freq_chan);
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range->num_channels = 14;
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for (i = 0; i < ARRAY_SIZE(freq_chan) && i < IW_MAX_FREQUENCIES; i++) {
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for (i = 0; (i < 14) && (i < IW_MAX_FREQUENCIES); i++) {
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range->freq[i].i = i + 1;
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range->freq[i].m = freq_chan[i] * 100000;
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range->freq[i].m = ieee80211_dsss_chan_to_freq(i + 1) * 100000;
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range->freq[i].e = 1;
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}
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range->num_frequency = i;
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@ -44,6 +44,7 @@
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/wireless.h>
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#include <linux/ieee80211.h>
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#include <net/iw_handler.h>
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@ -111,12 +112,6 @@ static void wl3501_release(struct pcmcia_device *link);
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*/
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static dev_info_t wl3501_dev_info = "wl3501_cs";
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static int wl3501_chan2freq[] = {
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[0] = 2412, [1] = 2417, [2] = 2422, [3] = 2427, [4] = 2432,
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[5] = 2437, [6] = 2442, [7] = 2447, [8] = 2452, [9] = 2457,
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[10] = 2462, [11] = 2467, [12] = 2472, [13] = 2477,
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};
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static const struct {
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int reg_domain;
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int min, max, deflt;
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@ -1510,7 +1505,7 @@ static int wl3501_get_freq(struct net_device *dev, struct iw_request_info *info,
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{
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struct wl3501_card *this = netdev_priv(dev);
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wrqu->freq.m = wl3501_chan2freq[this->chan - 1] * 100000;
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wrqu->freq.m = ieee80211_dsss_chan_to_freq(this->chan) * 100000;
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wrqu->freq.e = 1;
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return 0;
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}
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@ -919,10 +919,9 @@ static int zd1201_set_freq(struct net_device *dev,
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if (freq->e == 0)
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channel = freq->m;
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else {
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if (freq->m >= 2482)
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channel = 14;
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if (freq->m >= 2407)
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channel = (freq->m-2407)/5;
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channel = ieee80211_freq_to_dsss_chan(freq->m);
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if (channel < 0)
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channel = 0;
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}
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err = zd1201_setconfig16(zd, ZD1201_RID_CNFOWNCHANNEL, channel);
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@ -1185,4 +1185,120 @@ static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
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return hdr->addr1;
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}
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/**
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* ieee80211_fhss_chan_to_freq - get channel frequency
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* @channel: the FHSS channel
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*
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* Convert IEEE802.11 FHSS channel to frequency (MHz)
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* Ref IEEE 802.11-2007 section 14.6
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*/
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static inline int ieee80211_fhss_chan_to_freq(int channel)
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{
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if ((channel > 1) && (channel < 96))
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return channel + 2400;
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else
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return -1;
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}
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/**
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* ieee80211_freq_to_fhss_chan - get channel
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* @freq: the channels frequency
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*
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* Convert frequency (MHz) to IEEE802.11 FHSS channel
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* Ref IEEE 802.11-2007 section 14.6
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*/
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static inline int ieee80211_freq_to_fhss_chan(int freq)
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{
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if ((freq > 2401) && (freq < 2496))
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return freq - 2400;
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else
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return -1;
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}
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/**
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* ieee80211_dsss_chan_to_freq - get channel center frequency
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* @channel: the DSSS channel
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*
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* Convert IEEE802.11 DSSS channel to the center frequency (MHz).
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* Ref IEEE 802.11-2007 section 15.6
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*/
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static inline int ieee80211_dsss_chan_to_freq(int channel)
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{
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if ((channel > 0) && (channel < 14))
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return 2407 + (channel * 5);
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else if (channel == 14)
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return 2484;
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else
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return -1;
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}
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/**
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* ieee80211_freq_to_dsss_chan - get channel
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* @freq: the frequency
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*
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* Convert frequency (MHz) to IEEE802.11 DSSS channel
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* Ref IEEE 802.11-2007 section 15.6
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*
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* This routine selects the channel with the closest center frequency.
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*/
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static inline int ieee80211_freq_to_dsss_chan(int freq)
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{
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if ((freq >= 2410) && (freq < 2475))
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return (freq - 2405) / 5;
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else if ((freq >= 2482) && (freq < 2487))
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return 14;
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else
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return -1;
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}
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/* Convert IEEE802.11 HR DSSS channel to frequency (MHz) and back
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* Ref IEEE 802.11-2007 section 18.4.6.2
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*
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* The channels and frequencies are the same as those defined for DSSS
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*/
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#define ieee80211_hr_chan_to_freq(chan) ieee80211_dsss_chan_to_freq(chan)
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#define ieee80211_freq_to_hr_chan(freq) ieee80211_freq_to_dsss_chan(freq)
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/* Convert IEEE802.11 ERP channel to frequency (MHz) and back
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* Ref IEEE 802.11-2007 section 19.4.2
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*/
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#define ieee80211_erp_chan_to_freq(chan) ieee80211_hr_chan_to_freq(chan)
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#define ieee80211_freq_to_erp_chan(freq) ieee80211_freq_to_hr_chan(freq)
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/**
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* ieee80211_ofdm_chan_to_freq - get channel center frequency
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* @s_freq: starting frequency == (dotChannelStartingFactor/2) MHz
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* @channel: the OFDM channel
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*
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* Convert IEEE802.11 OFDM channel to center frequency (MHz)
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* Ref IEEE 802.11-2007 section 17.3.8.3.2
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*/
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static inline int ieee80211_ofdm_chan_to_freq(int s_freq, int channel)
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{
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if ((channel > 0) && (channel <= 200) &&
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(s_freq >= 4000))
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return s_freq + (channel * 5);
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else
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return -1;
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}
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/**
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* ieee80211_freq_to_ofdm_channel - get channel
|
||||
* @s_freq: starting frequency == (dotChannelStartingFactor/2) MHz
|
||||
* @freq: the frequency
|
||||
*
|
||||
* Convert frequency (MHz) to IEEE802.11 OFDM channel
|
||||
* Ref IEEE 802.11-2007 section 17.3.8.3.2
|
||||
*
|
||||
* This routine selects the channel with the closest center frequency.
|
||||
*/
|
||||
static inline int ieee80211_freq_to_ofdm_chan(int s_freq, int freq)
|
||||
{
|
||||
if ((freq > (s_freq + 2)) && (freq <= (s_freq + 1202)) &&
|
||||
(s_freq >= 4000))
|
||||
return (freq + 2 - s_freq) / 5;
|
||||
else
|
||||
return -1;
|
||||
}
|
||||
|
||||
#endif /* LINUX_IEEE80211_H */
|
||||
|
|
|
|||
Loading…
Reference in a new issue