package/kernel/mac80211/patches/440-ath5k_channel_bw_debugfs.patch

   1 This adds a bwmode debugfs file which can be used to set alternate
   2 channel operating bandwidths.  Only tested with AR5413 and only at
   3 5 and 20 mhz channels.
   4
   5 Signed-off-by: Pat Erley <pat-lkml at erley.org>
   6 ---
   7 Other devices will need to be added to the switch in  write_file_bwmode
   8
   9 drivers/net/wireless/ath/ath5k/debug.c |   86 ++++++++++++++++++++++++++++++++
  10  1 files changed, 86 insertions(+), 0 deletions(-)
  11
  12 --- a/drivers/net/wireless/ath/ath5k/debug.c
  13 +++ b/drivers/net/wireless/ath/ath5k/debug.c
  14 @@ -821,6 +821,97 @@ static const struct file_operations fops
  15         .llseek = default_llseek,
  16  };
  17
  18 +/* debugfs: bwmode */
  19 +
  20 +static ssize_t read_file_bwmode(struct file *file, char __user *user_buf,
  21 +                                  size_t count, loff_t *ppos)
  22 +{
  23 +       struct ath5k_hw *ah = file->private_data;
  24 +       char buf[15];
  25 +       unsigned int len = 0;
  26 +
  27 +       int cur_ah_bwmode = ah->ah_bwmode_debug;
  28 +
  29 +#define print_selected(MODE, LABEL) \
  30 +       if (cur_ah_bwmode == MODE) \
  31 +               len += snprintf(buf+len, sizeof(buf)-len, "[%s]", LABEL); \
  32 +       else \
  33 +               len += snprintf(buf+len, sizeof(buf)-len, "%s", LABEL); \
  34 +       len += snprintf(buf+len, sizeof(buf)-len, " ");
  35 +
  36 +       print_selected(AR5K_BWMODE_5MHZ, "5");
  37 +       print_selected(AR5K_BWMODE_10MHZ, "10");
  38 +       print_selected(AR5K_BWMODE_DEFAULT, "20");
  39 +       print_selected(AR5K_BWMODE_40MHZ, "40");
  40 +#undef print_selected
  41 +
  42 +       len += snprintf(buf+len, sizeof(buf)-len, "\n");
  43 +
  44 +       return simple_read_from_buffer(user_buf, count, ppos, buf, len);
  45 +}
  46 +
  47 +static ssize_t write_file_bwmode(struct file *file,
  48 +                                const char __user *userbuf,
  49 +                                size_t count, loff_t *ppos)
  50 +{
  51 +       struct ath5k_hw *ah = file->private_data;
  52 +       char buf[3];
  53 +       int bw = 20;
  54 +       int tobwmode = AR5K_BWMODE_DEFAULT;
  55 +
  56 +       if (copy_from_user(buf, userbuf, min(count, sizeof(buf))))
  57 +               return -EFAULT;
  58 +
  59 +       /* TODO: Add check for active interface */
  60 +
  61 +       if(strncmp(buf, "5", 1) == 0 ) {
  62 +               tobwmode = AR5K_BWMODE_5MHZ;
  63 +               bw = 5;
  64 +       } else if ( strncmp(buf, "10", 2) == 0 ) {
  65 +               tobwmode = AR5K_BWMODE_10MHZ;
  66 +               bw = 10;
  67 +       } else if ( strncmp(buf, "20", 2) == 0 ) {
  68 +               tobwmode = AR5K_BWMODE_DEFAULT;
  69 +               bw = 20;
  70 +       } else if ( strncmp(buf, "40", 2) == 0 ) {
  71 +               tobwmode = AR5K_BWMODE_40MHZ;
  72 +               bw = 40;
  73 +       } else
  74 +               return -EINVAL;
  75 +
  76 +       ATH5K_INFO(ah, "Changing to %imhz channel width[%i]\n",
  77 +               bw, tobwmode);
  78 +
  79 +       switch (ah->ah_radio) {
  80 +       /* TODO: only define radios that actually support 5/10mhz channels */
  81 +       case AR5K_RF5413:
  82 +       case AR5K_RF5110:
  83 +       case AR5K_RF5111:
  84 +       case AR5K_RF5112:
  85 +       case AR5K_RF2413:
  86 +       case AR5K_RF2316:
  87 +       case AR5K_RF2317:
  88 +       case AR5K_RF2425:
  89 +               if(ah->ah_bwmode_debug != tobwmode) {
  90 +                       mutex_lock(&ah->lock);
  91 +                       ah->ah_bwmode = tobwmode;
  92 +                       ah->ah_bwmode_debug = tobwmode;
  93 +                       mutex_unlock(&ah->lock);
  94 +               }
  95 +               break;
  96 +       default:
  97 +               return -EOPNOTSUPP;
  98 +       }
  99 +       return count;
 100 +}
 101 +
 102 +static const struct file_operations fops_bwmode = {
 103 +       .read = read_file_bwmode,
 104 +       .write = write_file_bwmode,
 105 +       .open = simple_open,
 106 +       .owner = THIS_MODULE,
 107 +       .llseek = default_llseek,
 108 +};
 109
 110  /* debugfs: queues etc */
 111
 112 @@ -914,6 +1005,9 @@ ath5k_debug_init_device(struct ath5k_hw
 113         debugfs_create_file("beacon", S_IWUSR | S_IRUSR, phydir, ah,
 114                             &fops_beacon);
 115
 116 +       debugfs_create_file("bwmode", S_IWUSR | S_IRUSR, phydir, ah,
 117 +                           &fops_bwmode);
 118 +
 119         debugfs_create_file("reset", S_IWUSR, phydir, ah, &fops_reset);
 120
 121         debugfs_create_file("antenna", S_IWUSR | S_IRUSR, phydir, ah,
 122 --- a/drivers/net/wireless/ath/ath5k/ath5k.h
 123 +++ b/drivers/net/wireless/ath/ath5k/ath5k.h
 124 @@ -1369,6 +1369,7 @@ struct ath5k_hw {
 125         u8                      ah_coverage_class;
 126         bool                    ah_ack_bitrate_high;
 127         u8                      ah_bwmode;
 128 +       u8                      ah_bwmode_debug;
 129         bool                    ah_short_slot;
 130
 131         /* Antenna Control */
 132 --- a/drivers/net/wireless/ath/ath5k/base.c
 133 +++ b/drivers/net/wireless/ath/ath5k/base.c
 134 @@ -466,6 +466,9 @@ ath5k_chan_set(struct ath5k_hw *ah, stru
 135                 return -EINVAL;
 136         }
 137
 138 +       if (ah->ah_bwmode_debug != AR5K_BWMODE_DEFAULT)
 139 +               ah->ah_bwmode = ah->ah_bwmode_debug;
 140 +
 141         /*
 142          * To switch channels clear any pending DMA operations;
 143          * wait long enough for the RX fifo to drain, reset the