1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/power.c b/drivers/staging/vt6656/power.c
new file mode 100644
index 000000000..e5411f628
--- /dev/null
+++ b/drivers/staging/vt6656/power.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
+ * All rights reserved.
+ *
+ * Purpose: Handles 802.11 power management functions
+ *
+ * Author: Lyndon Chen
+ *
+ * Date: July 17, 2002
+ *
+ * Functions:
+ *      vnt_enable_power_saving - Enable Power Saving Mode
+ *      PSvDiasblePowerSaving - Disable Power Saving Mode
+ *      vnt_next_tbtt_wakeup - Decide if we need to wake up at next Beacon
+ *
+ * Revision History:
+ *
+ */
+
+#include "mac.h"
+#include "device.h"
+#include "power.h"
+#include "wcmd.h"
+#include "rxtx.h"
+#include "card.h"
+#include "usbpipe.h"
+
+/*
+ *
+ * Routine Description:
+ * Enable hw power saving functions
+ *
+ * Return Value:
+ *    None.
+ *
+ */
+
+void vnt_enable_power_saving(struct vnt_private *priv, u16 listen_interval)
+{
+	u16 aid = priv->current_aid | BIT(14) | BIT(15);
+
+	/* set period of power up before TBTT */
+	vnt_mac_write_word(priv, MAC_REG_PWBT, C_PWBT);
+
+	if (priv->op_mode != NL80211_IFTYPE_ADHOC)
+		/* set AID */
+		vnt_mac_write_word(priv, MAC_REG_AIDATIM, aid);
+
+	/* Warren:06-18-2004,the sequence must follow
+	 * PSEN->AUTOSLEEP->GO2DOZE
+	 */
+	/* enable power saving hw function */
+	vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_PSEN);
+
+	/* Set AutoSleep */
+	vnt_mac_reg_bits_on(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
+
+	/* Warren:MUST turn on this once before turn on AUTOSLEEP ,or the
+	 * AUTOSLEEP doesn't work
+	 */
+	vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_GO2DOZE);
+
+	/* always listen beacon */
+	vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
+
+	dev_dbg(&priv->usb->dev,  "PS:Power Saving Mode Enable...\n");
+}
+
+int vnt_disable_power_saving(struct vnt_private *priv)
+{
+	int ret;
+
+	/* disable power saving hw function */
+	ret = vnt_control_out(priv, MESSAGE_TYPE_DISABLE_PS, 0,
+			      0, 0, NULL);
+	if (ret)
+		return ret;
+
+	/* clear AutoSleep */
+	vnt_mac_reg_bits_off(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
+
+	/* set always listen beacon */
+	vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
+
+	return 0;
+}
+
+/*
+ *
+ * Routine Description:
+ * Check if Next TBTT must wake up
+ *
+ * Return Value:
+ *    None.
+ *
+ */
+
+int vnt_next_tbtt_wakeup(struct vnt_private *priv)
+{
+	struct ieee80211_hw *hw = priv->hw;
+	struct ieee80211_conf *conf = &hw->conf;
+	int wake_up = false;
+
+	if (conf->listen_interval > 1) {
+		/* Turn on wake up to listen next beacon */
+		vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);
+		wake_up = true;
+	}
+
+	return wake_up;
+}