ath9k: Dump modal noisefloor calibration history

Debugfs file location:
<debugfs_mnt>/ieee80211/phy#/ath9k/dump_nfcal

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 9bec3b8..da45f32 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1163,6 +1163,59 @@ static const struct file_operations fops_regdump = {
        .llseek = default_llseek,/* read accesses f_pos */
 };
 
+static ssize_t read_file_dump_nfcal(struct file *file, char __user *user_buf,
+                                   size_t count, loff_t *ppos)
+{
+       struct ath_softc *sc = file->private_data;
+       struct ath_hw *ah = sc->sc_ah;
+       struct ath9k_nfcal_hist *h = sc->caldata.nfCalHist;
+       struct ath_common *common = ath9k_hw_common(ah);
+       struct ieee80211_conf *conf = &common->hw->conf;
+       u32 len = 0, size = 1500;
+       u32 i, j;
+       ssize_t retval = 0;
+       char *buf;
+       u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
+       u8 nread;
+
+       buf = kzalloc(size, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       len += snprintf(buf + len, size - len,
+                       "Channel Noise Floor : %d\n", ah->noise);
+       len += snprintf(buf + len, size - len,
+                       "Chain | privNF | # Readings | NF Readings\n");
+       for (i = 0; i < NUM_NF_READINGS; i++) {
+               if (!(chainmask & (1 << i)) ||
+                   ((i >= AR5416_MAX_CHAINS) && !conf_is_ht40(conf)))
+                       continue;
+
+               nread = AR_PHY_CCA_FILTERWINDOW_LENGTH - h[i].invalidNFcount;
+               len += snprintf(buf + len, size - len, " %d\t %d\t %d\t\t",
+                               i, h[i].privNF, nread);
+               for (j = 0; j < nread; j++)
+                       len += snprintf(buf + len, size - len,
+                                       " %d", h[i].nfCalBuffer[j]);
+               len += snprintf(buf + len, size - len, "\n");
+       }
+
+       if (len > size)
+               len = size;
+
+       retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+       kfree(buf);
+
+       return retval;
+}
+
+static const struct file_operations fops_dump_nfcal = {
+       .read = read_file_dump_nfcal,
+       .open = ath9k_debugfs_open,
+       .owner = THIS_MODULE,
+       .llseek = default_llseek,
+};
+
 static ssize_t read_file_base_eeprom(struct file *file, char __user *user_buf,
                                     size_t count, loff_t *ppos)
 {
@@ -1262,6 +1315,8 @@ int ath9k_init_debug(struct ath_hw *ah)
                            &ah->config.cwm_ignore_extcca);
        debugfs_create_file("regdump", S_IRUSR, sc->debug.debugfs_phy, sc,
                            &fops_regdump);
+       debugfs_create_file("dump_nfcal", S_IRUSR, sc->debug.debugfs_phy, sc,
+                           &fops_dump_nfcal);
        debugfs_create_file("base_eeprom", S_IRUSR, sc->debug.debugfs_phy, sc,
                            &fops_base_eeprom);
        debugfs_create_file("modal_eeprom", S_IRUSR, sc->debug.debugfs_phy, sc,