1 files changed, 194 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl1251/ps.c b/drivers/net/wireless/wl1251/ps.c
new file mode 100644
index 000000000000..5ed47c8373d2
--- /dev/null
+++ b/drivers/net/wireless/wl1251/ps.c
@@ -0,0 +1,194 @@
+/*
+ * This file is part of wl1251
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * 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 "reg.h"
+#include "ps.h"
+#include "cmd.h"
+#include "io.h"
+
+/* in ms */
+#define WL1251_WAKEUP_TIMEOUT 100
+
+void wl1251_elp_work(struct work_struct *work)
+{
+        struct delayed_work *dwork;
+        struct wl1251 *wl;
+
+        dwork = container_of(work, struct delayed_work, work);
+        wl = container_of(dwork, struct wl1251, elp_work);
+
+        wl1251_debug(DEBUG_PSM, "elp work");
+
+        mutex_lock(&wl->mutex);
+
+        if (wl->elp || !wl->psm)
+                goto out;
+
+        wl1251_debug(DEBUG_PSM, "chip to elp");
+        wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
+        wl->elp = true;
+
+out:
+        mutex_unlock(&wl->mutex);
+}
+
+#define ELP_ENTRY_DELAY  5
+
+/* Routines to toggle sleep mode while in ELP */
+void wl1251_ps_elp_sleep(struct wl1251 *wl)
+{
+        unsigned long delay;
+
+        if (wl->psm) {
+                cancel_delayed_work(&wl->elp_work);
+                delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
+                ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
+        }
+}
+
+int wl1251_ps_elp_wakeup(struct wl1251 *wl)
+{
+        unsigned long timeout, start;
+        u32 elp_reg;
+
+        if (!wl->elp)
+                return 0;
+
+        wl1251_debug(DEBUG_PSM, "waking up chip from elp");
+
+        start = jiffies;
+        timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
+
+        wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
+
+        elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
+
+        /*
+         * FIXME: we should wait for irq from chip but, as a temporary
+         * solution to simplify locking, let's poll instead
+         */
+        while (!(elp_reg & ELPCTRL_WLAN_READY)) {
+                if (time_after(jiffies, timeout)) {
+                        wl1251_error("elp wakeup timeout");
+                        return -ETIMEDOUT;
+                }
+                msleep(1);
+                elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
+        }
+
+        wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
+                     jiffies_to_msecs(jiffies - start));
+
+        wl->elp = false;
+
+        return 0;
+}
+
+static int wl1251_ps_set_elp(struct wl1251 *wl, bool enable)
+{
+        int ret;
+
+        if (enable) {
+                wl1251_debug(DEBUG_PSM, "sleep auth psm/elp");
+
+                ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
+                if (ret < 0)
+                        return ret;
+
+                wl1251_ps_elp_sleep(wl);
+        } else {
+                wl1251_debug(DEBUG_PSM, "sleep auth cam");
+
+                /*
+                 * When the target is in ELP, we can only
+                 * access the ELP control register. Thus,
+                 * we have to wake the target up before
+                 * changing the power authorization.
+                 */
+
+                wl1251_ps_elp_wakeup(wl);
+
+                ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
+                if (ret < 0)
+                        return ret;
+        }
+
+        return 0;
+}
+
+int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_cmd_ps_mode mode)
+{
+        int ret;
+
+        switch (mode) {
+        case STATION_POWER_SAVE_MODE:
+                wl1251_debug(DEBUG_PSM, "entering psm");
+
+                /* enable beacon filtering */
+                ret = wl1251_acx_beacon_filter_opt(wl, true);
+                if (ret < 0)
+                        return ret;
+
+                ret = wl1251_acx_wake_up_conditions(wl,
+                                                    WAKE_UP_EVENT_DTIM_BITMAP,
+                                                    wl->listen_int);
+                if (ret < 0)
+                        return ret;
+
+                ret = wl1251_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE);
+                if (ret < 0)
+                        return ret;
+
+                ret = wl1251_ps_set_elp(wl, true);
+                if (ret < 0)
+                        return ret;
+
+                wl->psm = 1;
+                break;
+        case STATION_ACTIVE_MODE:
+        default:
+                wl1251_debug(DEBUG_PSM, "leaving psm");
+                ret = wl1251_ps_set_elp(wl, false);
+                if (ret < 0)
+                        return ret;
+
+                /* disable beacon filtering */
+                ret = wl1251_acx_beacon_filter_opt(wl, false);
+                if (ret < 0)
+                        return ret;
+
+                ret = wl1251_acx_wake_up_conditions(wl,
+                                                    WAKE_UP_EVENT_DTIM_BITMAP,
+                                                    wl->listen_int);
+                if (ret < 0)
+                        return ret;
+
+                ret = wl1251_cmd_ps_mode(wl, STATION_ACTIVE_MODE);
+                if (ret < 0)
+                        return ret;
+
+                wl->psm = 0;
+                break;
+        }
+
+        return ret;
+}
+