Maemo patchset 20101501+0m5

[h-e-n] / drivers / net / wireless / wl12xx / wl1271_ps.c

diff --git a/drivers/net/wireless/wl12xx/wl1271_ps.c b/drivers/net/wireless/wl12xx/wl1271_ps.c
new file mode 100644 (file)
index 0000000..bf85b14
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_ps.c
@@ -0,0 +1,127 @@
+/*
+ * This file is part of wl1271
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Contact: Kalle Valo <kalle.valo@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include "wl1271_reg.h"
+#include "wl1271_ps.h"
+#include "wl1271_spi.h"
+
+#define WL1271_WAKEUP_TIMEOUT 500
+
+/* Routines to toggle sleep mode while in ELP */
+void wl1271_ps_elp_sleep(struct wl1271 *wl)
+{
+       if (wl->elp || !wl->psm)
+               return;
+
+       /*
+        * Go to ELP unless there is work already pending - pending work
+        * will immediately wakeup the chipset anyway.
+        */
+       if (!work_pending(&wl->irq_work) && !work_pending(&wl->tx_work)) {
+               wl1271_debug(DEBUG_PSM, "chip to elp");
+               wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
+               wl->elp = true;
+       }
+}
+
+int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
+{
+       DECLARE_COMPLETION_ONSTACK(compl);
+       unsigned long flags;
+       int ret;
+       u32 start_time = jiffies;
+       bool pending = false;
+
+       if (!wl->elp)
+               return 0;
+
+       wl1271_debug(DEBUG_PSM, "waking up chip from elp");
+
+       /*
+        * The spinlock is required here to synchronize both the work and
+        * the completion variable in one entity.
+        */
+       spin_lock_irqsave(&wl->wl_lock, flags);
+       if (work_pending(&wl->irq_work) || chip_awake)
+               pending = true;
+       else
+               wl->elp_compl = &compl;
+       spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+       wl1271_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
+
+       if (!pending) {
+               ret = wait_for_completion_timeout(
+                       &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
+               if (ret == 0)
+                       wl1271_error("ELP wakeup timeout!");
+               else if (ret < 0) {
+                       wl1271_error("ELP wakeup completion error.");
+                       return -EIO;
+               }
+       }
+
+       wl->elp = false;
+
+       wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
+                    jiffies_to_msecs(jiffies - start_time));
+
+       return 0;
+}
+
+int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode)
+{
+       int ret;
+
+       switch (mode) {
+       case STATION_POWER_SAVE_MODE:
+               wl1271_debug(DEBUG_PSM, "entering psm");
+               ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
+               if (ret < 0)
+                       return ret;
+
+               wl1271_ps_elp_sleep(wl);
+               if (ret < 0)
+                       return ret;
+
+               wl->psm = 1;
+               break;
+       case STATION_ACTIVE_MODE:
+       default:
+               wl1271_debug(DEBUG_PSM, "leaving psm");
+               ret = wl1271_ps_elp_wakeup(wl, false);
+               if (ret < 0)
+                       return ret;
+
+               ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
+               if (ret < 0)
+                       return ret;
+
+               wl->psm = 0;
+               break;
+       }
+
+       return ret;
+}
+
+