libertas: remove ps_supported flag, use fwcapinfo

Power save support depends on the firmware capabilities rather than the
card's hardware interface.  Use the FW_CAPINFO_PS bit in the firmware
capabilities mask throughout the driver in place of the redundant
ps_supported flag and don't make decisions about PS support in the
interface drivers (with the exception of a special case in the USB
driver).

V2: put the USB special case in the right place.

Signed-off-by: Andrey Yurovsky <andrey@cozybit.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/dev.h

@@ -260,7 +260,6 @@ struct lbs_private {
 	u16 psmode;		/* Wlan802_11PowermodeCAM=disable
 				   Wlan802_11PowermodeMAX_PSP=enable */
 	u32 psstate;
-	char ps_supported;
 	u8 needtowakeup;
 
 	struct assoc_request * pending_assoc_req;

drivers/net/wireless/libertas/if_cs.c

@@ -933,9 +933,6 @@ static int if_cs_probe(struct pcmcia_device *p_dev)
 		goto out3;
 	}
 
-	/* The firmware for the CF card supports powersave */
-	priv->ps_supported = 1;
-
 	ret = 0;
 	goto out;
 

drivers/net/wireless/libertas/if_sdio.c

@@ -1039,9 +1039,6 @@ static int if_sdio_probe(struct sdio_func *func,
 	if (ret)
 		goto err_activate_card;
 
-	if (priv->fwcapinfo & FW_CAPINFO_PS)
-		priv->ps_supported = 1;
-
 out:
 	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
 

drivers/net/wireless/libertas/if_spi.c

@@ -1118,7 +1118,6 @@ static int __devinit if_spi_probe(struct spi_device *spi)
 	priv->card = card;
 	priv->hw_host_to_card = if_spi_host_to_card;
 	priv->fw_ready = 1;
-	priv->ps_supported = 1;
 
 	/* Initialize interrupt handling stuff. */
 	card->run_thread = 1;

drivers/net/wireless/libertas/if_usb.c

@@ -181,13 +181,14 @@ static void if_usb_setup_firmware(struct lbs_private *priv)
 	wake_method.action = cpu_to_le16(CMD_ACT_GET);
 	if (lbs_cmd_with_response(priv, CMD_802_11_FW_WAKE_METHOD, &wake_method)) {
 		lbs_pr_info("Firmware does not seem to support PS mode\n");
+		priv->fwcapinfo &= ~FW_CAPINFO_PS;
 	} else {
 		if (le16_to_cpu(wake_method.method) == CMD_WAKE_METHOD_COMMAND_INT) {
 			lbs_deb_usb("Firmware seems to support PS with wake-via-command\n");
-			priv->ps_supported = 1;
 		} else {
 			/* The versions which boot up this way don't seem to
 			   work even if we set it to the command interrupt */
+			priv->fwcapinfo &= ~FW_CAPINFO_PS;
 			lbs_pr_info("Firmware doesn't wake via command interrupt; disabling PS mode\n");
 		}
 	}

drivers/net/wireless/libertas/wext.c

@@ -712,7 +712,7 @@ static int lbs_set_power(struct net_device *dev, struct iw_request_info *info,
 
 	lbs_deb_enter(LBS_DEB_WEXT);
 
-	if (!priv->ps_supported) {
+	if (!(priv->fwcapinfo & FW_CAPINFO_PS)) {
 		if (vwrq->disabled)
 			return 0;
 		else