wifi: wcn36xx: Add debugfs entry to read firmware feature strings

Add in the ability to easily find the firmware feature bits reported in the
get feature exchange without having to compile-in debug prints.

root@linaro-alip:~# cat /sys/kernel/debug/ieee80211/phy0/wcn36xx/firmware_feat_caps
MCC
P2P
DOT11AC
SLM_SESSIONIZATION
DOT11AC_OPMODE
SAP32STA
TDLS
P2P_GO_NOA_DECOUPLE_INIT_SCAN
WLANACTIVE_OFFLOAD
BEACON_OFFLOAD
SCAN_OFFLOAD
BCN_MISS_OFFLOAD
STA_POWERSAVE
STA_ADVANCED_PWRSAVE
BCN_FILTER
RTT
RATECTRL
WOW
WLAN_ROAM_SCAN_OFFLOAD
SPECULATIVE_PS_POLL
IBSS_HEARTBEAT_OFFLOAD
WLAN_SCAN_OFFLOAD
WLAN_PERIODIC_TX_PTRN
ADVANCE_TDLS
BATCH_SCAN
FW_IN_TX_PATH
EXTENDED_NSOFFLOAD_SLOT
CH_SWITCH_V1
HT40_OBSS_SCAN
UPDATE_CHANNEL_LIST
WLAN_MCADDR_FLT
WLAN_CH144
TDLS_SCAN_COEXISTENCE
LINK_LAYER_STATS_MEAS
MU_MIMO
EXTENDED_SCAN
DYNAMIC_WMM_PS
MAC_SPOOFED_SCAN
FW_STATS
WPS_PRBRSP_TMPL
BCN_IE_FLT_DELTA

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220727161655.2286867-5-bryan.odonoghue@linaro.org

diff --git a/drivers/net/wireless/ath/wcn36xx/debug.c b/drivers/net/wireless/ath/wcn36xx/debug.c
index 6af306a..58b3c05 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/debug.c
+++ b/drivers/net/wireless/ath/wcn36xx/debug.c
@@ -21,6 +21,7 @@
 #include "wcn36xx.h"
 #include "debug.h"
 #include "pmc.h"
+#include "firmware.h"
 
 #ifdef CONFIG_WCN36XX_DEBUGFS
 
@@ -136,6 +137,42 @@ static const struct file_operations fops_wcn36xx_dump = {
        .write =       write_file_dump,
 };
 
+static ssize_t read_file_firmware_feature_caps(struct file *file,
+                                              char __user *user_buf,
+                                              size_t count, loff_t *ppos)
+{
+       struct wcn36xx *wcn = file->private_data;
+       size_t len = 0, buf_len = 2048;
+       char *buf;
+       int i;
+       int ret;
+
+       buf = kzalloc(buf_len, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       mutex_lock(&wcn->hal_mutex);
+       for (i = 0; i < MAX_FEATURE_SUPPORTED; i++) {
+               if (wcn36xx_firmware_get_feat_caps(wcn->fw_feat_caps, i)) {
+                       len += scnprintf(buf + len, buf_len - len, "%s\n",
+                                        wcn36xx_firmware_get_cap_name(i));
+               }
+               if (len >= buf_len)
+                       break;
+       }
+       mutex_unlock(&wcn->hal_mutex);
+
+       ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+       kfree(buf);
+
+       return ret;
+}
+
+static const struct file_operations fops_wcn36xx_firmware_feat_caps = {
+       .open = simple_open,
+       .read = read_file_firmware_feature_caps,
+};
+
 #define ADD_FILE(name, mode, fop, priv_data)           \
        do {                                                    \
                struct dentry *d;                               \
@@ -163,6 +200,8 @@ void wcn36xx_debugfs_init(struct wcn36xx *wcn)
 
        ADD_FILE(bmps_switcher, 0600, &fops_wcn36xx_bmps, wcn);
        ADD_FILE(dump, 0200, &fops_wcn36xx_dump, wcn);
+       ADD_FILE(firmware_feat_caps, 0200,
+                &fops_wcn36xx_firmware_feat_caps, wcn);
 }
 
 void wcn36xx_debugfs_exit(struct wcn36xx *wcn)

diff --git a/drivers/net/wireless/ath/wcn36xx/debug.h b/drivers/net/wireless/ath/wcn36xx/debug.h
index 46307aa..7116d96 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/debug.h
+++ b/drivers/net/wireless/ath/wcn36xx/debug.h
@@ -31,6 +31,7 @@ struct wcn36xx_dfs_entry {
        struct dentry *rootdir;
        struct wcn36xx_dfs_file file_bmps_switcher;
        struct wcn36xx_dfs_file file_dump;
+       struct wcn36xx_dfs_file file_firmware_feat_caps;
 };
 
 void wcn36xx_debugfs_init(struct wcn36xx *wcn);