drivers/net/wireless/iwlwifi/iwl-phy-db.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) 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.
  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 - 2012 Intel Corporation. All rights reserved.
  34  * 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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  41  *    notice, this list of conditions and the following disclaimer.
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  44  *    the documentation and/or other materials provided with the
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  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
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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-dev.h"
  69
  70 #include "iwl-phy-db.h"
  71
  72 #define CHANNEL_NUM_SIZE        4       /* num of channels in calib_ch size */
  73
  74 struct iwl_phy_db *iwl_phy_db_init(struct device *dev)
  75 {
  76         struct iwl_phy_db *phy_db = kzalloc(sizeof(struct iwl_phy_db),
  77                                             GFP_KERNEL);
  78
  79         if (!phy_db)
  80                 return phy_db;
  81
  82         phy_db->dev = dev;
  83
  84         /* TODO: add default values of the phy db. */
  85         return phy_db;
  86 }
  87
  88 /*
  89  * get phy db section: returns a pointer to a phy db section specified by
  90  * type and channel group id.
  91  */
  92 static struct iwl_phy_db_entry *
  93 iwl_phy_db_get_section(struct iwl_phy_db *phy_db,
  94                        enum iwl_phy_db_section_type type,
  95                        u16 chg_id)
  96 {
  97         if (!phy_db || type < 0 || type >= IWL_PHY_DB_MAX)
  98                 return NULL;
  99
 100         switch (type) {
 101         case IWL_PHY_DB_CFG:
 102                 return &phy_db->cfg;
 103         case IWL_PHY_DB_CALIB_NCH:
 104                 return &phy_db->calib_nch;
 105         case IWL_PHY_DB_CALIB_CH:
 106                 return &phy_db->calib_ch;
 107         case IWL_PHY_DB_CALIB_CHG_PAPD:
 108                 if (chg_id < 0 || chg_id >= IWL_NUM_PAPD_CH_GROUPS)
 109                         return NULL;
 110                 return &phy_db->calib_ch_group_papd[chg_id];
 111         case IWL_PHY_DB_CALIB_CHG_TXP:
 112                 if (chg_id < 0 || chg_id >= IWL_NUM_TXP_CH_GROUPS)
 113                         return NULL;
 114                 return &phy_db->calib_ch_group_txp[chg_id];
 115         default:
 116                 return NULL;
 117         }
 118         return NULL;
 119 }
 120
 121 static void iwl_phy_db_free_section(struct iwl_phy_db *phy_db,
 122                                     enum iwl_phy_db_section_type type,
 123                                     u16 chg_id)
 124 {
 125         struct iwl_phy_db_entry *entry =
 126                                 iwl_phy_db_get_section(phy_db, type, chg_id);
 127         if (!entry)
 128                 return;
 129
 130         kfree(entry->data);
 131         entry->data = NULL;
 132         entry->size = 0;
 133 }
 134
 135 void iwl_phy_db_free(struct iwl_phy_db *phy_db)
 136 {
 137         int i;
 138
 139         if (!phy_db)
 140                 return;
 141
 142         iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CFG, 0);
 143         iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_NCH, 0);
 144         iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_CH, 0);
 145         for (i = 0; i < IWL_NUM_PAPD_CH_GROUPS; i++)
 146                 iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_CHG_PAPD, i);
 147         for (i = 0; i < IWL_NUM_TXP_CH_GROUPS; i++)
 148                 iwl_phy_db_free_section(phy_db, IWL_PHY_DB_CALIB_CHG_TXP, i);
 149
 150         kfree(phy_db);
 151 }
 152
 153 int iwl_phy_db_set_section(struct iwl_phy_db *phy_db,
 154                            enum iwl_phy_db_section_type type, u8 *data,
 155                            u16 size, gfp_t alloc_ctx)
 156 {
 157         struct iwl_phy_db_entry *entry;
 158         u16 chg_id = 0;
 159
 160         if (!phy_db)
 161                 return -EINVAL;
 162
 163         if (type == IWL_PHY_DB_CALIB_CHG_PAPD ||
 164             type == IWL_PHY_DB_CALIB_CHG_TXP)
 165                 chg_id = le16_to_cpup((__le16 *)data);
 166
 167         entry = iwl_phy_db_get_section(phy_db, type, chg_id);
 168         if (!entry)
 169                 return -EINVAL;
 170
 171         kfree(entry->data);
 172         entry->data = kmemdup(data, size, alloc_ctx);
 173         if (!entry->data) {
 174                 entry->size = 0;
 175                 return -ENOMEM;
 176         }
 177
 178         entry->size = size;
 179
 180         if (type == IWL_PHY_DB_CALIB_CH) {
 181                 phy_db->channel_num = le32_to_cpup((__le32 *)data);
 182                 phy_db->channel_size =
 183                       (size - CHANNEL_NUM_SIZE) / phy_db->channel_num;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int is_valid_channel(u16 ch_id)
 190 {
 191         if (ch_id <= 14 ||
 192             (36 <= ch_id && ch_id <= 64 && ch_id % 4 == 0) ||
 193             (100 <= ch_id && ch_id <= 140 && ch_id % 4 == 0) ||
 194             (145 <= ch_id && ch_id <= 165 && ch_id % 4 == 1))
 195                 return 1;
 196         return 0;
 197 }
 198
 199 static u8 ch_id_to_ch_index(u16 ch_id)
 200 {
 201         if (WARN_ON(!is_valid_channel(ch_id)))
 202                 return 0xff;
 203
 204         if (ch_id <= 14)
 205                 return ch_id - 1;
 206         if (ch_id <= 64)
 207                 return (ch_id + 20) / 4;
 208         if (ch_id <= 140)
 209                 return (ch_id - 12) / 4;
 210         return (ch_id - 13) / 4;
 211 }
 212
 213
 214 static u16 channel_id_to_papd(u16 ch_id)
 215 {
 216         if (WARN_ON(!is_valid_channel(ch_id)))
 217                 return 0xff;
 218
 219         if (1 <= ch_id && ch_id <= 14)
 220                 return 0;
 221         if (36 <= ch_id && ch_id <= 64)
 222                 return 1;
 223         if (100 <= ch_id && ch_id <= 140)
 224                 return 2;
 225         return 3;
 226 }
 227
 228 static u16 channel_id_to_txp(struct iwl_phy_db *phy_db, u16 ch_id)
 229 {
 230         struct iwl_phy_db_chg_txp *txp_chg;
 231         int i;
 232         u8 ch_index = ch_id_to_ch_index(ch_id);
 233         if (ch_index == 0xff)
 234                 return 0xff;
 235
 236         for (i = 0; i < IWL_NUM_TXP_CH_GROUPS; i++) {
 237                 txp_chg = (void *)phy_db->calib_ch_group_txp[i].data;
 238                 if (!txp_chg)
 239                         return 0xff;
 240                 /*
 241                  * Looking for the first channel group that its max channel is
 242                  * higher then wanted channel.
 243                  */
 244                 if (le16_to_cpu(txp_chg->max_channel_idx) >= ch_index)
 245                         return i;
 246         }
 247         return 0xff;
 248 }
 249
 250 int iwl_phy_db_get_section_data(struct iwl_phy_db *phy_db,
 251                                 enum iwl_phy_db_section_type type, u8 **data,
 252                                 u16 *size, u16 ch_id)
 253 {
 254         struct iwl_phy_db_entry *entry;
 255         u32 channel_num;
 256         u32 channel_size;
 257         u16 ch_group_id = 0;
 258         u16 index;
 259
 260         if (!phy_db)
 261                 return -EINVAL;
 262
 263         /* find wanted channel group */
 264         if (type == IWL_PHY_DB_CALIB_CHG_PAPD)
 265                 ch_group_id = channel_id_to_papd(ch_id);
 266         else if (type == IWL_PHY_DB_CALIB_CHG_TXP)
 267                 ch_group_id = channel_id_to_txp(phy_db, ch_id);
 268
 269         entry = iwl_phy_db_get_section(phy_db, type, ch_group_id);
 270         if (!entry)
 271                 return -EINVAL;
 272
 273         if (type == IWL_PHY_DB_CALIB_CH) {
 274                 index = ch_id_to_ch_index(ch_id);
 275                 channel_num = phy_db->channel_num;
 276                 channel_size = phy_db->channel_size;
 277                 if (index >= channel_num) {
 278                         IWL_ERR(phy_db, "Wrong channel number %d", ch_id);
 279                         return -EINVAL;
 280                 }
 281                 *data = entry->data + CHANNEL_NUM_SIZE + index * channel_size;
 282                 *size = channel_size;
 283         } else {
 284                 *data = entry->data;
 285                 *size = entry->size;
 286         }
 287         return 0;
 288 }