package/kernel/mac80211/patches/ath/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 Index: backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/debug.c
  13 ===================================================================
  14 --- backports-v4.18-rc7.orig/drivers/net/wireless/ath/ath5k/debug.c
  15 +++ backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/debug.c
  16 @@ -822,6 +822,97 @@ static const struct file_operations fops
  17         .llseek = default_llseek,
  18  };
  19
  20 +/* debugfs: bwmode */
  21 +
  22 +static ssize_t read_file_bwmode(struct file *file, char __user *user_buf,
  23 +                                  size_t count, loff_t *ppos)
  24 +{
  25 +       struct ath5k_hw *ah = file->private_data;
  26 +       char buf[15];
  27 +       unsigned int len = 0;
  28 +
  29 +       int cur_ah_bwmode = ah->ah_bwmode_debug;
  30 +
  31 +#define print_selected(MODE, LABEL) \
  32 +       if (cur_ah_bwmode == MODE) \
  33 +               len += snprintf(buf+len, sizeof(buf)-len, "[%s]", LABEL); \
  34 +       else \
  35 +               len += snprintf(buf+len, sizeof(buf)-len, "%s", LABEL); \
  36 +       len += snprintf(buf+len, sizeof(buf)-len, " ");
  37 +
  38 +       print_selected(AR5K_BWMODE_5MHZ, "5");
  39 +       print_selected(AR5K_BWMODE_10MHZ, "10");
  40 +       print_selected(AR5K_BWMODE_DEFAULT, "20");
  41 +       print_selected(AR5K_BWMODE_40MHZ, "40");
  42 +#undef print_selected
  43 +
  44 +       len += snprintf(buf+len, sizeof(buf)-len, "\n");
  45 +
  46 +       return simple_read_from_buffer(user_buf, count, ppos, buf, len);
  47 +}
  48 +
  49 +static ssize_t write_file_bwmode(struct file *file,
  50 +                                const char __user *userbuf,
  51 +                                size_t count, loff_t *ppos)
  52 +{
  53 +       struct ath5k_hw *ah = file->private_data;
  54 +       char buf[3];
  55 +       int bw = 20;
  56 +       int tobwmode = AR5K_BWMODE_DEFAULT;
  57 +
  58 +       if (copy_from_user(buf, userbuf, min(count, sizeof(buf))))
  59 +               return -EFAULT;
  60 +
  61 +       /* TODO: Add check for active interface */
  62 +
  63 +       if(strncmp(buf, "5", 1) == 0 ) {
  64 +               tobwmode = AR5K_BWMODE_5MHZ;
  65 +               bw = 5;
  66 +       } else if ( strncmp(buf, "10", 2) == 0 ) {
  67 +               tobwmode = AR5K_BWMODE_10MHZ;
  68 +               bw = 10;
  69 +       } else if ( strncmp(buf, "20", 2) == 0 ) {
  70 +               tobwmode = AR5K_BWMODE_DEFAULT;
  71 +               bw = 20;
  72 +       } else if ( strncmp(buf, "40", 2) == 0 ) {
  73 +               tobwmode = AR5K_BWMODE_40MHZ;
  74 +               bw = 40;
  75 +       } else
  76 +               return -EINVAL;
  77 +
  78 +       ATH5K_INFO(ah, "Changing to %imhz channel width[%i]\n",
  79 +               bw, tobwmode);
  80 +
  81 +       switch (ah->ah_radio) {
  82 +       /* TODO: only define radios that actually support 5/10mhz channels */
  83 +       case AR5K_RF5413:
  84 +       case AR5K_RF5110:
  85 +       case AR5K_RF5111:
  86 +       case AR5K_RF5112:
  87 +       case AR5K_RF2413:
  88 +       case AR5K_RF2316:
  89 +       case AR5K_RF2317:
  90 +       case AR5K_RF2425:
  91 +               if(ah->ah_bwmode_debug != tobwmode) {
  92 +                       mutex_lock(&ah->lock);
  93 +                       ah->ah_bwmode = tobwmode;
  94 +                       ah->ah_bwmode_debug = tobwmode;
  95 +                       mutex_unlock(&ah->lock);
  96 +               }
  97 +               break;
  98 +       default:
  99 +               return -EOPNOTSUPP;
 100 +       }
 101 +       return count;
 102 +}
 103 +
 104 +static const struct file_operations fops_bwmode = {
 105 +       .read = read_file_bwmode,
 106 +       .write = write_file_bwmode,
 107 +       .open = simple_open,
 108 +       .owner = THIS_MODULE,
 109 +       .llseek = default_llseek,
 110 +};
 111
 112  /* debugfs: queues etc */
 113
 114 @@ -1016,6 +1107,8 @@ ath5k_debug_init_device(struct ath5k_hw
 115         debugfs_create_file("queue", 0600, phydir, ah, &fops_queue);
 116         debugfs_create_bool("32khz_clock", 0600, phydir,
 117                             &ah->ah_use_32khz_clock);
 118 +       debugfs_create_file("bwmode", S_IWUSR | S_IRUSR, phydir, ah,
 119 +                           &fops_bwmode);
 120  }
 121
 122  /* functions used in other places */
 123 Index: backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/ath5k.h
 124 ===================================================================
 125 --- backports-v4.18-rc7.orig/drivers/net/wireless/ath/ath5k/ath5k.h
 126 +++ backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/ath5k.h
 127 @@ -1372,6 +1372,7 @@ struct ath5k_hw {
 128         u8                      ah_coverage_class;
 129         bool                    ah_ack_bitrate_high;
 130         u8                      ah_bwmode;
 131 +       u8                      ah_bwmode_debug;
 132         bool                    ah_short_slot;
 133
 134         /* Antenna Control */
 135 Index: backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/base.c
 136 ===================================================================
 137 --- backports-v4.18-rc7.orig/drivers/net/wireless/ath/ath5k/base.c
 138 +++ backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/base.c
 139 @@ -466,6 +466,9 @@ ath5k_chan_set(struct ath5k_hw *ah, stru
 140                 return -EINVAL;
 141         }
 142
 143 +       if (ah->ah_bwmode_debug != AR5K_BWMODE_DEFAULT)
 144 +               ah->ah_bwmode = ah->ah_bwmode_debug;
 145 +
 146         /*
 147          * To switch channels clear any pending DMA operations;
 148          * wait long enough for the RX fifo to drain, reset the