libertas: Add auto deep sleep support for SD8385/SD8686/SD8688

Add timer based auto deep sleep feature in libertas driver which can be
configured using iwconfig command. This is tested on SD8688, SD8686 cards
with firmware versions 10.38.1.p25, 9.70.4.p0 respectively on 32-bit and 64-bit
platforms. Tests have been done for USB/CS cards to make sure that the patch
won't break USB/CS code. We didn't test the if_spi driver.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 25 insertions, 1 deletions

diff --git a/drivers/net/wireless/libertas/README b/drivers/net/wireless/libertas/README
index ab6a2d518af0..2726c044430f 100644
--- a/drivers/net/wireless/libertas/README
+++ b/drivers/net/wireless/libertas/README
@@ -1,5 +1,5 @@
 ================================================================================
-                        README for USB8388
+                        README for Libertas
 
  (c) Copyright © 2003-2006, Marvell International Ltd.
  All Rights Reserved
@@ -226,4 +226,28 @@ setuserscan
     All entries in the scan table (not just the new scan data when keep=1)
     will be displayed upon completion by use of the getscantable ioctl.
 
+========================
+IWCONFIG COMMANDS
+========================
+power period
+
+        This command is used to configure the station in deep sleep mode /
+        auto deep sleep mode.
+
+        The timer is implemented to monitor the activities (command, event,
+        etc.). When an activity is detected station will exit from deep
+        sleep mode automatically and restart the timer. At timer expiry
+        (no activity for defined time period) the deep sleep mode is entered
+        automatically.
+
+        Note: this command is for SDIO interface only.
+
+        Usage:
+        To enable deep sleep mode do:
+                iwconfig wlan0 power period 0
+        To enable auto deep sleep mode with idle time period 5 seconds do:
+                iwconfig wlan0 power period 5
+        To disable deep sleep/auto deep sleep mode do:
+                iwconfig wlan0 power period -1
+
 ==============================================================================