drivers/net/wireless/iwlwifi/iwl-helpers.h

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #ifndef __iwl_helpers_h__
  31 #define __iwl_helpers_h__
  32
  33 #include <linux/ctype.h>
  34
  35 #define KELVIN_TO_CELSIUS(x) ((x)-273)
  36 #define CELSIUS_TO_KELVIN(x) ((x)+273)
  37 #define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
  38
  39
  40 static inline struct ieee80211_conf *ieee80211_get_hw_conf(
  41         struct ieee80211_hw *hw)
  42 {
  43         return &hw->conf;
  44 }
  45
  46 static inline int iwl_check_bits(unsigned long field, unsigned long mask)
  47 {
  48         return ((field & mask) == mask) ? 1 : 0;
  49 }
  50
  51 static inline unsigned long elapsed_jiffies(unsigned long start,
  52                                             unsigned long end)
  53 {
  54         if (end >= start)
  55                 return end - start;
  56
  57         return end + (MAX_JIFFY_OFFSET - start) + 1;
  58 }
  59
  60 /**
  61  * iwl_queue_inc_wrap - increment queue index, wrap back to beginning
  62  * @index -- current index
  63  * @n_bd -- total number of entries in queue (must be power of 2)
  64  */
  65 static inline int iwl_queue_inc_wrap(int index, int n_bd)
  66 {
  67         return ++index & (n_bd - 1);
  68 }
  69
  70 /**
  71  * iwl_queue_dec_wrap - decrement queue index, wrap back to end
  72  * @index -- current index
  73  * @n_bd -- total number of entries in queue (must be power of 2)
  74  */
  75 static inline int iwl_queue_dec_wrap(int index, int n_bd)
  76 {
  77         return --index & (n_bd - 1);
  78 }
  79
  80 /* TODO: Move fw_desc functions to iwl-pci.ko */
  81 static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
  82                                     struct fw_desc *desc)
  83 {
  84         if (desc->v_addr)
  85                 pci_free_consistent(pci_dev, desc->len,
  86                                     desc->v_addr, desc->p_addr);
  87         desc->v_addr = NULL;
  88         desc->len = 0;
  89 }
  90
  91 static inline int iwl_alloc_fw_desc(struct pci_dev *pci_dev,
  92                                     struct fw_desc *desc)
  93 {
  94         desc->v_addr = pci_alloc_consistent(pci_dev, desc->len, &desc->p_addr);
  95         return (desc->v_addr != NULL) ? 0 : -ENOMEM;
  96 }
  97
  98 #endif                          /* __iwl_helpers_h__ */