iwlegacy: change some symbols duplicated from iwlwifi directory
[linux-2.6.git] / drivers / net / wireless / iwlegacy / iwl-eeprom.c
1 /******************************************************************************
2  *
3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
5  *
6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of version 2 of the GNU General Public License as
12  * published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22  * USA
23  *
24  * The full GNU General Public License is included in this distribution
25  * in the file called LICENSE.GPL.
26  *
27  * Contact Information:
28  *  Intel Linux Wireless <ilw@linux.intel.com>
29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30  *
31  * BSD LICENSE
32  *
33  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
34  * All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  *
40  *  * Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  *  * Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in
44  *    the documentation and/or other materials provided with the
45  *    distribution.
46  *  * Neither the name Intel Corporation nor the names of its
47  *    contributors may be used to endorse or promote products derived
48  *    from this software without specific prior written permission.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61  *****************************************************************************/
62
63
64 #include <linux/kernel.h>
65 #include <linux/module.h>
66 #include <linux/slab.h>
67 #include <linux/init.h>
68
69 #include <net/mac80211.h>
70
71 #include "iwl-commands.h"
72 #include "iwl-dev.h"
73 #include "iwl-core.h"
74 #include "iwl-debug.h"
75 #include "iwl-eeprom.h"
76 #include "iwl-io.h"
77
78 /************************** EEPROM BANDS ****************************
79  *
80  * The iwlegacy_eeprom_band definitions below provide the mapping from the
81  * EEPROM contents to the specific channel number supported for each
82  * band.
83  *
84  * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
85  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
86  * The specific geography and calibration information for that channel
87  * is contained in the eeprom map itself.
88  *
89  * During init, we copy the eeprom information and channel map
90  * information into priv->channel_info_24/52 and priv->channel_map_24/52
91  *
92  * channel_map_24/52 provides the index in the channel_info array for a
93  * given channel.  We have to have two separate maps as there is channel
94  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
95  * band_2
96  *
97  * A value of 0xff stored in the channel_map indicates that the channel
98  * is not supported by the hardware at all.
99  *
100  * A value of 0xfe in the channel_map indicates that the channel is not
101  * valid for Tx with the current hardware.  This means that
102  * while the system can tune and receive on a given channel, it may not
103  * be able to associate or transmit any frames on that
104  * channel.  There is no corresponding channel information for that
105  * entry.
106  *
107  *********************************************************************/
108
109 /* 2.4 GHz */
110 const u8 iwlegacy_eeprom_band_1[14] = {
111         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
112 };
113
114 /* 5.2 GHz bands */
115 static const u8 iwlegacy_eeprom_band_2[] = {    /* 4915-5080MHz */
116         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
117 };
118
119 static const u8 iwlegacy_eeprom_band_3[] = {    /* 5170-5320MHz */
120         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
121 };
122
123 static const u8 iwlegacy_eeprom_band_4[] = {    /* 5500-5700MHz */
124         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
125 };
126
127 static const u8 iwlegacy_eeprom_band_5[] = {    /* 5725-5825MHz */
128         145, 149, 153, 157, 161, 165
129 };
130
131 static const u8 iwlegacy_eeprom_band_6[] = {       /* 2.4 ht40 channel */
132         1, 2, 3, 4, 5, 6, 7
133 };
134
135 static const u8 iwlegacy_eeprom_band_7[] = {       /* 5.2 ht40 channel */
136         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
137 };
138
139 /******************************************************************************
140  *
141  * EEPROM related functions
142  *
143 ******************************************************************************/
144
145 static int iwl_legacy_eeprom_verify_signature(struct iwl_priv *priv)
146 {
147         u32 gp = iwl_read32(priv, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
148         int ret = 0;
149
150         IWL_DEBUG_EEPROM(priv, "EEPROM signature=0x%08x\n", gp);
151         switch (gp) {
152         case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
153         case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
154                 break;
155         default:
156                 IWL_ERR(priv, "bad EEPROM signature,"
157                         "EEPROM_GP=0x%08x\n", gp);
158                 ret = -ENOENT;
159                 break;
160         }
161         return ret;
162 }
163
164 const u8
165 *iwl_legacy_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
166 {
167         BUG_ON(offset >= priv->cfg->base_params->eeprom_size);
168         return &priv->eeprom[offset];
169 }
170 EXPORT_SYMBOL(iwl_legacy_eeprom_query_addr);
171
172 u16 iwl_legacy_eeprom_query16(const struct iwl_priv *priv, size_t offset)
173 {
174         if (!priv->eeprom)
175                 return 0;
176         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
177 }
178 EXPORT_SYMBOL(iwl_legacy_eeprom_query16);
179
180 /**
181  * iwl_legacy_eeprom_init - read EEPROM contents
182  *
183  * Load the EEPROM contents from adapter into priv->eeprom
184  *
185  * NOTE:  This routine uses the non-debug IO access functions.
186  */
187 int iwl_legacy_eeprom_init(struct iwl_priv *priv)
188 {
189         __le16 *e;
190         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
191         int sz;
192         int ret;
193         u16 addr;
194
195         /* allocate eeprom */
196         sz = priv->cfg->base_params->eeprom_size;
197         IWL_DEBUG_EEPROM(priv, "NVM size = %d\n", sz);
198         priv->eeprom = kzalloc(sz, GFP_KERNEL);
199         if (!priv->eeprom) {
200                 ret = -ENOMEM;
201                 goto alloc_err;
202         }
203         e = (__le16 *)priv->eeprom;
204
205         priv->cfg->ops->lib->apm_ops.init(priv);
206
207         ret = iwl_legacy_eeprom_verify_signature(priv);
208         if (ret < 0) {
209                 IWL_ERR(priv, "EEPROM not found, EEPROM_GP=0x%08x\n", gp);
210                 ret = -ENOENT;
211                 goto err;
212         }
213
214         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
215         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
216         if (ret < 0) {
217                 IWL_ERR(priv, "Failed to acquire EEPROM semaphore.\n");
218                 ret = -ENOENT;
219                 goto err;
220         }
221
222         /* eeprom is an array of 16bit values */
223         for (addr = 0; addr < sz; addr += sizeof(u16)) {
224                 u32 r;
225
226                 _iwl_legacy_write32(priv, CSR_EEPROM_REG,
227                              CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
228
229                 ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
230                                           CSR_EEPROM_REG_READ_VALID_MSK,
231                                           CSR_EEPROM_REG_READ_VALID_MSK,
232                                           IWL_EEPROM_ACCESS_TIMEOUT);
233                 if (ret < 0) {
234                         IWL_ERR(priv, "Time out reading EEPROM[%d]\n",
235                                                         addr);
236                         goto done;
237                 }
238                 r = _iwl_legacy_read_direct32(priv, CSR_EEPROM_REG);
239                 e[addr / 2] = cpu_to_le16(r >> 16);
240         }
241
242         IWL_DEBUG_EEPROM(priv, "NVM Type: %s, version: 0x%x\n",
243                        "EEPROM",
244                        iwl_legacy_eeprom_query16(priv, EEPROM_VERSION));
245
246         ret = 0;
247 done:
248         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
249
250 err:
251         if (ret)
252                 iwl_legacy_eeprom_free(priv);
253         /* Reset chip to save power until we load uCode during "up". */
254         iwl_legacy_apm_stop(priv);
255 alloc_err:
256         return ret;
257 }
258 EXPORT_SYMBOL(iwl_legacy_eeprom_init);
259
260 void iwl_legacy_eeprom_free(struct iwl_priv *priv)
261 {
262         kfree(priv->eeprom);
263         priv->eeprom = NULL;
264 }
265 EXPORT_SYMBOL(iwl_legacy_eeprom_free);
266
267 static void iwl_legacy_init_band_reference(const struct iwl_priv *priv,
268                         int eep_band, int *eeprom_ch_count,
269                         const struct iwl_eeprom_channel **eeprom_ch_info,
270                         const u8 **eeprom_ch_index)
271 {
272         u32 offset = priv->cfg->ops->lib->
273                         eeprom_ops.regulatory_bands[eep_band - 1];
274         switch (eep_band) {
275         case 1:         /* 2.4GHz band */
276                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_1);
277                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
278                                 iwl_legacy_eeprom_query_addr(priv, offset);
279                 *eeprom_ch_index = iwlegacy_eeprom_band_1;
280                 break;
281         case 2:         /* 4.9GHz band */
282                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_2);
283                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
284                                 iwl_legacy_eeprom_query_addr(priv, offset);
285                 *eeprom_ch_index = iwlegacy_eeprom_band_2;
286                 break;
287         case 3:         /* 5.2GHz band */
288                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_3);
289                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
290                                 iwl_legacy_eeprom_query_addr(priv, offset);
291                 *eeprom_ch_index = iwlegacy_eeprom_band_3;
292                 break;
293         case 4:         /* 5.5GHz band */
294                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_4);
295                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
296                                 iwl_legacy_eeprom_query_addr(priv, offset);
297                 *eeprom_ch_index = iwlegacy_eeprom_band_4;
298                 break;
299         case 5:         /* 5.7GHz band */
300                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_5);
301                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
302                                 iwl_legacy_eeprom_query_addr(priv, offset);
303                 *eeprom_ch_index = iwlegacy_eeprom_band_5;
304                 break;
305         case 6:         /* 2.4GHz ht40 channels */
306                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_6);
307                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
308                                 iwl_legacy_eeprom_query_addr(priv, offset);
309                 *eeprom_ch_index = iwlegacy_eeprom_band_6;
310                 break;
311         case 7:         /* 5 GHz ht40 channels */
312                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_7);
313                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
314                                 iwl_legacy_eeprom_query_addr(priv, offset);
315                 *eeprom_ch_index = iwlegacy_eeprom_band_7;
316                 break;
317         default:
318                 BUG();
319                 return;
320         }
321 }
322
323 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
324                             ? # x " " : "")
325 /**
326  * iwl_legacy_mod_ht40_chan_info - Copy ht40 channel info into driver's priv.
327  *
328  * Does not set up a command, or touch hardware.
329  */
330 static int iwl_legacy_mod_ht40_chan_info(struct iwl_priv *priv,
331                               enum ieee80211_band band, u16 channel,
332                               const struct iwl_eeprom_channel *eeprom_ch,
333                               u8 clear_ht40_extension_channel)
334 {
335         struct iwl_channel_info *ch_info;
336
337         ch_info = (struct iwl_channel_info *)
338                         iwl_legacy_get_channel_info(priv, band, channel);
339
340         if (!iwl_legacy_is_channel_valid(ch_info))
341                 return -1;
342
343         IWL_DEBUG_EEPROM(priv, "HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
344                         " Ad-Hoc %ssupported\n",
345                         ch_info->channel,
346                         iwl_legacy_is_channel_a_band(ch_info) ?
347                         "5.2" : "2.4",
348                         CHECK_AND_PRINT(IBSS),
349                         CHECK_AND_PRINT(ACTIVE),
350                         CHECK_AND_PRINT(RADAR),
351                         CHECK_AND_PRINT(WIDE),
352                         CHECK_AND_PRINT(DFS),
353                         eeprom_ch->flags,
354                         eeprom_ch->max_power_avg,
355                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
356                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
357                         "" : "not ");
358
359         ch_info->ht40_eeprom = *eeprom_ch;
360         ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
361         ch_info->ht40_flags = eeprom_ch->flags;
362         if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
363                 ch_info->ht40_extension_channel &=
364                                         ~clear_ht40_extension_channel;
365
366         return 0;
367 }
368
369 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
370                             ? # x " " : "")
371
372 /**
373  * iwl_legacy_init_channel_map - Set up driver's info for all possible channels
374  */
375 int iwl_legacy_init_channel_map(struct iwl_priv *priv)
376 {
377         int eeprom_ch_count = 0;
378         const u8 *eeprom_ch_index = NULL;
379         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
380         int band, ch;
381         struct iwl_channel_info *ch_info;
382
383         if (priv->channel_count) {
384                 IWL_DEBUG_EEPROM(priv, "Channel map already initialized.\n");
385                 return 0;
386         }
387
388         IWL_DEBUG_EEPROM(priv, "Initializing regulatory info from EEPROM\n");
389
390         priv->channel_count =
391             ARRAY_SIZE(iwlegacy_eeprom_band_1) +
392             ARRAY_SIZE(iwlegacy_eeprom_band_2) +
393             ARRAY_SIZE(iwlegacy_eeprom_band_3) +
394             ARRAY_SIZE(iwlegacy_eeprom_band_4) +
395             ARRAY_SIZE(iwlegacy_eeprom_band_5);
396
397         IWL_DEBUG_EEPROM(priv, "Parsing data for %d channels.\n",
398                         priv->channel_count);
399
400         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
401                                      priv->channel_count, GFP_KERNEL);
402         if (!priv->channel_info) {
403                 IWL_ERR(priv, "Could not allocate channel_info\n");
404                 priv->channel_count = 0;
405                 return -ENOMEM;
406         }
407
408         ch_info = priv->channel_info;
409
410         /* Loop through the 5 EEPROM bands adding them in order to the
411          * channel map we maintain (that contains additional information than
412          * what just in the EEPROM) */
413         for (band = 1; band <= 5; band++) {
414
415                 iwl_legacy_init_band_reference(priv, band, &eeprom_ch_count,
416                                         &eeprom_ch_info, &eeprom_ch_index);
417
418                 /* Loop through each band adding each of the channels */
419                 for (ch = 0; ch < eeprom_ch_count; ch++) {
420                         ch_info->channel = eeprom_ch_index[ch];
421                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
422                             IEEE80211_BAND_5GHZ;
423
424                         /* permanently store EEPROM's channel regulatory flags
425                          *   and max power in channel info database. */
426                         ch_info->eeprom = eeprom_ch_info[ch];
427
428                         /* Copy the run-time flags so they are there even on
429                          * invalid channels */
430                         ch_info->flags = eeprom_ch_info[ch].flags;
431                         /* First write that ht40 is not enabled, and then enable
432                          * one by one */
433                         ch_info->ht40_extension_channel =
434                                         IEEE80211_CHAN_NO_HT40;
435
436                         if (!(iwl_legacy_is_channel_valid(ch_info))) {
437                                 IWL_DEBUG_EEPROM(priv,
438                                                "Ch. %d Flags %x [%sGHz] - "
439                                                "No traffic\n",
440                                                ch_info->channel,
441                                                ch_info->flags,
442                                                iwl_legacy_is_channel_a_band(ch_info) ?
443                                                "5.2" : "2.4");
444                                 ch_info++;
445                                 continue;
446                         }
447
448                         /* Initialize regulatory-based run-time data */
449                         ch_info->max_power_avg = ch_info->curr_txpow =
450                             eeprom_ch_info[ch].max_power_avg;
451                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
452                         ch_info->min_power = 0;
453
454                         IWL_DEBUG_EEPROM(priv, "Ch. %d [%sGHz] "
455                                        "%s%s%s%s%s%s(0x%02x %ddBm):"
456                                        " Ad-Hoc %ssupported\n",
457                                        ch_info->channel,
458                                        iwl_legacy_is_channel_a_band(ch_info) ?
459                                        "5.2" : "2.4",
460                                        CHECK_AND_PRINT_I(VALID),
461                                        CHECK_AND_PRINT_I(IBSS),
462                                        CHECK_AND_PRINT_I(ACTIVE),
463                                        CHECK_AND_PRINT_I(RADAR),
464                                        CHECK_AND_PRINT_I(WIDE),
465                                        CHECK_AND_PRINT_I(DFS),
466                                        eeprom_ch_info[ch].flags,
467                                        eeprom_ch_info[ch].max_power_avg,
468                                        ((eeprom_ch_info[ch].
469                                          flags & EEPROM_CHANNEL_IBSS)
470                                         && !(eeprom_ch_info[ch].
471                                              flags & EEPROM_CHANNEL_RADAR))
472                                        ? "" : "not ");
473
474                         /* Set the tx_power_user_lmt to the highest power
475                          * supported by any channel */
476                         if (eeprom_ch_info[ch].max_power_avg >
477                                                 priv->tx_power_user_lmt)
478                                 priv->tx_power_user_lmt =
479                                     eeprom_ch_info[ch].max_power_avg;
480
481                         ch_info++;
482                 }
483         }
484
485         /* Check if we do have HT40 channels */
486         if (priv->cfg->ops->lib->eeprom_ops.regulatory_bands[5] ==
487             EEPROM_REGULATORY_BAND_NO_HT40 &&
488             priv->cfg->ops->lib->eeprom_ops.regulatory_bands[6] ==
489             EEPROM_REGULATORY_BAND_NO_HT40)
490                 return 0;
491
492         /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
493         for (band = 6; band <= 7; band++) {
494                 enum ieee80211_band ieeeband;
495
496                 iwl_legacy_init_band_reference(priv, band, &eeprom_ch_count,
497                                         &eeprom_ch_info, &eeprom_ch_index);
498
499                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
500                 ieeeband =
501                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
502
503                 /* Loop through each band adding each of the channels */
504                 for (ch = 0; ch < eeprom_ch_count; ch++) {
505                         /* Set up driver's info for lower half */
506                         iwl_legacy_mod_ht40_chan_info(priv, ieeeband,
507                                                 eeprom_ch_index[ch],
508                                                 &eeprom_ch_info[ch],
509                                                 IEEE80211_CHAN_NO_HT40PLUS);
510
511                         /* Set up driver's info for upper half */
512                         iwl_legacy_mod_ht40_chan_info(priv, ieeeband,
513                                                 eeprom_ch_index[ch] + 4,
514                                                 &eeprom_ch_info[ch],
515                                                 IEEE80211_CHAN_NO_HT40MINUS);
516                 }
517         }
518
519         return 0;
520 }
521 EXPORT_SYMBOL(iwl_legacy_init_channel_map);
522
523 /*
524  * iwl_legacy_free_channel_map - undo allocations in iwl_legacy_init_channel_map
525  */
526 void iwl_legacy_free_channel_map(struct iwl_priv *priv)
527 {
528         kfree(priv->channel_info);
529         priv->channel_count = 0;
530 }
531 EXPORT_SYMBOL(iwl_legacy_free_channel_map);
532
533 /**
534  * iwl_legacy_get_channel_info - Find driver's private channel info
535  *
536  * Based on band and channel number.
537  */
538 const struct
539 iwl_channel_info *iwl_legacy_get_channel_info(const struct iwl_priv *priv,
540                                         enum ieee80211_band band, u16 channel)
541 {
542         int i;
543
544         switch (band) {
545         case IEEE80211_BAND_5GHZ:
546                 for (i = 14; i < priv->channel_count; i++) {
547                         if (priv->channel_info[i].channel == channel)
548                                 return &priv->channel_info[i];
549                 }
550                 break;
551         case IEEE80211_BAND_2GHZ:
552                 if (channel >= 1 && channel <= 14)
553                         return &priv->channel_info[channel - 1];
554                 break;
555         default:
556                 BUG();
557         }
558
559         return NULL;
560 }
561 EXPORT_SYMBOL(iwl_legacy_get_channel_info);