From 499bd6cddbc26d8087ff550da5e5ac834fb2727d Mon Sep 17 00:00:00 2001
From: Zhao Xuewen <zhaoxuewen@huawei.com>
Date: Fri, 12 Jun 2015 20:56:22 -0700
Subject: [PATCH] driver:wlan: wifi rssi adjust
Because of path loss of hardware,the returned rssi value
of wifi is not exactly. To ensure the signal strength
returned to framwork and application is exactly. the rssi
value need to be adjusted.
rssi value below -50dbm, adjust +4db.
rssi value above -50dbm, adjust +2db.
Change-Id: I7f390b1fe99bb06f481a82659dc9bdd205810bfd
Signed-off-by: Zheng Guolin <zhengguolin@huawei.com>
---
drivers/net/wireless/bcmdhd/dhd_linux.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/net/wireless/bcmdhd/dhd_linux.c b/drivers/net/wireless/bcmdhd/dhd_linux.c
index a731a535cac1..dcc8704f3f6b 100644
--- a/drivers/net/wireless/bcmdhd/dhd_linux.c
+++ b/drivers/net/wireless/bcmdhd/dhd_linux.c
@@ -152,6 +152,7 @@ extern bool ap_fw_loaded;
/* enable HOSTIP cache update from the host side when an eth0:N is up */
#define AOE_IP_ALIAS_SUPPORT 1
+#define RSSI_ADJUST_THRESHOLD -50 /* rssi threshold to be adjust */
#ifdef BCM_FD_AGGR
#include <bcm_rpc.h>
@@ -3624,6 +3625,7 @@ dhd_ioctl_entry(struct net_device *net, struct ifreq *ifr, int cmd)
int ret;
void *local_buf = NULL;
u16 buflen = 0;
+ scb_val_t *scb_val = NULL;
DHD_OS_WAKE_LOCK(&dhd->pub);
DHD_PERIM_LOCK(&dhd->pub);
@@ -3752,6 +3754,18 @@ dhd_ioctl_entry(struct net_device *net, struct ifreq *ifr, int cmd)
if (!bcmerror && buflen && local_buf && ioc.buf) {
DHD_PERIM_UNLOCK(&dhd->pub);
+ if(WLC_GET_RSSI == ioc.cmd)
+ {
+ scb_val = (scb_val_t *)local_buf;
+ if (scb_val->val <= RSSI_ADJUST_THRESHOLD)
+ {
+ scb_val->val += 4; /* rssi adjust: below -50dbm adjust 4dbm */
+ }
+ else
+ {
+ scb_val->val += 2; /* rssi adjust: above -50dbm adjust 2dbm */
+ }
+ }
if (copy_to_user(ioc.buf, local_buf, buflen))
bcmerror = -EFAULT;
DHD_PERIM_LOCK(&dhd->pub);
--
GitLab