drivers/net/wireless/iwlwifi/iwl-phy-db.c

   1 /******************************************************************************
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   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) 2007 - 2012 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.
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  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
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  33  * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
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  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
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  46  *  * Neither the name Intel Corporation nor the names of its
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  48  *    from this software without specific prior written permission.
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  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
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  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/slab.h>
  65 #include <linux/string.h>
  66
  67 #include "iwl-debug.h"
  68 #include "iwl-shared.h"
  69 #include "iwl-dev.h"
  70
  71 #include "iwl-phy-db.h"
  72
  73 #define CHANNEL_NUM_SIZE        4       /* num of channels in calib_ch size */
  74
  75 struct iwl_phy_db *iwl_phy_db_init(struct iwl_shared *shrd)
  76 {
  77         struct iwl_phy_db *phy_db = kzalloc(sizeof(struct iwl_phy_db),
  78                                             GFP_KERNEL);
  79
  80         if (!phy_db)
  81                 return phy_db;
  82
  83         phy_db->shrd = shrd;
  84
  85         /* TODO: add default values of the phy db. */
  86         return phy_db;
  87 }
  88
  89 /*
  90  * get phy db section: returns a pointer to a phy db section specified by
  91  * type and channel group id.
  92  */
  93 static struct iwl_phy_db_entry *
  94 iwl_phy_db_get_section(struct iwl_phy_db *phy_db,
  95                        enum iwl_phy_db_section_type type,
  96                        u16 chg_id)
  97 {
  98         if (!phy_db || type < 0 || type >= IWL_PHY_DB_MAX)
  99                 return NULL;
 100
 101         switch (type) {
 102         case IWL_PHY_DB_CFG:
 103                 return &phy_db->cfg;
 104         case IWL_PHY_DB_CALIB_NCH:
 105                 return &phy_db->calib_nch;
 106         case IWL_PHY_DB_CALIB_CH:
 107                 return &phy_db->calib_ch;
 108         case IWL_PHY_DB_CALIB_CHG_PAPD:
 109                 if (chg_id < 0 || chg_id >= IWL_NUM_PAPD_CH_GROUPS)
 110                         return NULL;
 111                 return &phy_db->calib_ch_group_papd[chg_id];
 112         case IWL_PHY_DB_CALIB_CHG_TXP:
 113                 if (chg_id < 0 || chg_id >= IWL_NUM_TXP_CH_GROUPS)
 114                         return NULL;
 115                 return &phy_db->calib_ch_group_txp[chg_id];
 116         default:
 117                 return NULL;
 118         }
 119         return NULL;
 120 }
 121
 122 static void iwl_phy_db_free_section(struct iwl_phy_db *phy_db,
 123                                     enum iwl_phy_db_section_type type,
 124                                     u16 chg_id)
 125 {
 126         struct iwl_phy_db_entry *entry =
 127                                 iwl_phy_db_get_section(phy_db, type, chg_id);
 128         if (!entry)
 129                 return;
 130
 131         kfree(entry->data);
 132         entry->data = NULL;
 133         entry->size = 0;
 134 }
 135
 136 void iwl_phy_db_free(struct iwl_phy_db *phy_db)
 137 {
 138         int i;
 139
 140         if (!phy_db)
 141                 return;
 142
 143         iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CFG, 0);
 144         iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_NCH, 0);
 145         iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_CH, 0);
 146         for (i = 0; i < IWL_NUM_PAPD_CH_GROUPS; i++)
 147                 iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_CHG_PAPD, i);
 148         for (i = 0; i < IWL_NUM_TXP_CH_GROUPS; i++)
 149                 iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_CHG_TXP, i);
 150
 151         kfree(phy_db);
 152 }
 153
 154 int iwl_phy_db_set_section(struct iwl_phy_db *phy_db,
 155                            enum iwl_phy_db_section_type type, u8 *data,
 156                            u16 size, gfp_t alloc_ctx)
 157 {
 158         struct iwl_phy_db_entry *entry;
 159         u16 chg_id = 0;
 160
 161         if (!phy_db)
 162                 return -EINVAL;
 163
 164         if (type == IWL_PHY_DB_CALIB_CHG_PAPD ||
 165             type == IWL_PHY_DB_CALIB_CHG_TXP)
 166                 chg_id = le16_to_cpup((__le16 *)data);
 167
 168         entry = iwl_phy_db_get_section(phy_db, type, chg_id);
 169         if (!entry)
 170                 return -EINVAL;
 171
 172         kfree(entry->data);
 173         entry->data = kmemdup(data, size, alloc_ctx);
 174         if (!entry->data) {
 175                 entry->size = 0;
 176                 return -ENOMEM;
 177         }
 178
 179         entry->size = size;
 180
 181         if (type == IWL_PHY_DB_CALIB_CH) {
 182                 phy_db->channel_num = le32_to_cpup((__le32 *)data);
 183                 phy_db->channel_size =
 184                       (size - CHANNEL_NUM_SIZE) / phy_db->channel_num;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int is_valid_channel(u16 ch_id)
 191 {
 192         if (ch_id <= 14 ||
 193             (36 <= ch_id && ch_id <= 64 && ch_id % 4 == 0) ||
 194             (100 <= ch_id && ch_id <= 140 && ch_id % 4 == 0) ||
 195             (145 <= ch_id && ch_id <= 165 && ch_id % 4 == 1))
 196                 return 1;
 197         return 0;
 198 }
 199
 200 static u8 ch_id_to_ch_index(u16 ch_id)
 201 {
 202         if (WARN_ON(!is_valid_channel(ch_id)))
 203                 return 0xff;
 204
 205         if (ch_id <= 14)
 206                 return ch_id - 1;
 207         if (ch_id <= 64)
 208                 return (ch_id + 20) / 4;
 209         if (ch_id <= 140)
 210                 return (ch_id - 12) / 4;
 211         return (ch_id - 13) / 4;
 212 }
 213
 214
 215 static u16 channel_id_to_papd(u16 ch_id)
 216 {
 217         if (WARN_ON(!is_valid_channel(ch_id)))
 218                 return 0xff;
 219
 220         if (1 <= ch_id && ch_id <= 14)
 221                 return 0;
 222         if (36 <= ch_id && ch_id <= 64)
 223                 return 1;
 224         if (100 <= ch_id && ch_id <= 140)
 225                 return 2;
 226         return 3;
 227 }
 228
 229 static u16 channel_id_to_txp(struct iwl_phy_db *phy_db, u16 ch_id)
 230 {
 231         struct iwl_phy_db_chg_txp *txp_chg;
 232         int i;
 233         u8 ch_index = ch_id_to_ch_index(ch_id);
 234         if (ch_index == 0xff)
 235                 return 0xff;
 236
 237         for (i = 0; i < IWL_NUM_TXP_CH_GROUPS; i++) {
 238                 txp_chg = (void *)phy_db->calib_ch_group_txp[i].data;
 239                 if (!txp_chg)
 240                         return 0xff;
 241                 /*
 242                  * Looking for the first channel group that its max channel is
 243                  * higher then wanted channel.
 244                  */
 245                 if (le16_to_cpu(txp_chg->max_channel_idx) >= ch_index)
 246                         return i;
 247         }
 248         return 0xff;
 249 }
 250
 251 int iwl_phy_db_get_section_data(struct iwl_phy_db *phy_db,
 252                                 enum iwl_phy_db_section_type type, u8 **data,
 253                                 u16 *size, u16 ch_id)
 254 {
 255         struct iwl_phy_db_entry *entry;
 256         u32 channel_num;
 257         u32 channel_size;
 258         u16 ch_group_id = 0;
 259         u16 index;
 260
 261         if (!phy_db)
 262                 return -EINVAL;
 263
 264         /* find wanted channel group */
 265         if (type == IWL_PHY_DB_CALIB_CHG_PAPD)
 266                 ch_group_id = channel_id_to_papd(ch_id);
 267         else if (type == IWL_PHY_DB_CALIB_CHG_TXP)
 268                 ch_group_id = channel_id_to_txp(phy_db, ch_id);
 269
 270         entry = iwl_phy_db_get_section(phy_db, type, ch_group_id);
 271         if (!entry)
 272                 return -EINVAL;
 273
 274         if (type == IWL_PHY_DB_CALIB_CH) {
 275                 index = ch_id_to_ch_index(ch_id);
 276                 channel_num = phy_db->channel_num;
 277                 channel_size = phy_db->channel_size;
 278                 if (index >= channel_num) {
 279                         IWL_ERR(phy_db, "Wrong channel number %d", ch_id);
 280                         return -EINVAL;
 281                 }
 282                 *data = entry->data + CHANNEL_NUM_SIZE + index * channel_size;
 283                 *size = channel_size;
 284         } else {
 285                 *data = entry->data;
 286                 *size = entry->size;
 287         }
 288         return 0;
 289 }