[PATCH 4/4] wcn36xx: Add debugfs entry to read firmware feature strings

["Bryan O'Donoghue" <bryan.odonoghue@xxxxxxxxxx>]

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
FW Cap = MCC
FW Cap = P2P
FW Cap = DOT11AC
FW Cap = SLM_SESSIONIZATION
FW Cap = DOT11AC_OPMODE
FW Cap = SAP32STA
FW Cap = TDLS
FW Cap = P2P_GO_NOA_DECOUPLE_INIT_SCAN
FW Cap = WLANACTIVE_OFFLOAD
FW Cap = BEACON_OFFLOAD
FW Cap = SCAN_OFFLOAD
FW Cap = BCN_MISS_OFFLOAD
FW Cap = STA_POWERSAVE
FW Cap = STA_ADVANCED_PWRSAVE
FW Cap = BCN_FILTER
FW Cap = RTT
FW Cap = RATECTRL
FW Cap = WOW
FW Cap = WLAN_ROAM_SCAN_OFFLOAD
FW Cap = SPECULATIVE_PS_POLL
FW Cap = IBSS_HEARTBEAT_OFFLOAD
FW Cap = WLAN_SCAN_OFFLOAD
FW Cap = WLAN_PERIODIC_TX_PTRN
FW Cap = ADVANCE_TDLS
FW Cap = BATCH_SCAN
FW Cap = FW_IN_TX_PATH
FW Cap = EXTENDED_NSOFFLOAD_SLOT
FW Cap = CH_SWITCH_V1
FW Cap = HT40_OBSS_SCAN
FW Cap = UPDATE_CHANNEL_LIST
FW Cap = WLAN_MCADDR_FLT
FW Cap = WLAN_CH144
FW Cap = TDLS_SCAN_COEXISTENCE
FW Cap = LINK_LAYER_STATS_MEAS
FW Cap = MU_MIMO
FW Cap = EXTENDED_SCAN
FW Cap = DYNAMIC_WMM_PS
FW Cap = MAC_SPOOFED_SCAN
FW Cap = FW_STATS
FW Cap = WPS_PRBRSP_TMPL
FW Cap = BCN_IE_FLT_DELTA

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
---
 drivers/net/wireless/ath/wcn36xx/debug.c | 37 ++++++++++++++++++++++++
 drivers/net/wireless/ath/wcn36xx/debug.h |  1 +
 2 files changed, 38 insertions(+)

diff --git a/drivers/net/wireless/ath/wcn36xx/debug.c b/drivers/net/wireless/ath/wcn36xx/debug.c
index 6af306ae41ad..ca6f22a00f75 100644
--- 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 +137,40 @@ 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;
+	unsigned long page = get_zeroed_page(GFP_KERNEL);
+	char *p = (char *)page;
+	int i;
+	int ret;
+
+	if (!p)
+		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)) {
+			p += sprintf(p, "FW Cap = %s\n",
+				     wcn36xx_firmware_get_cap_name(i));
+		}
+	}
+	mutex_unlock(&wcn->hal_mutex);
+
+	ret = simple_read_from_buffer(user_buf, count, ppos, (char *)page,
+				      (unsigned long)p - page);
+
+	free_page(page);
+	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 +198,8 @@ 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 46307aa562d3..7116d96e0543 100644
--- 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);
-- 
2.36.1