wl1251: move to it's own directory

wl1271 driver is under heavy development but on the other hand the older
wl1251 driver is currently considered more as a legacy driver. To make it
easier to develop wl1271 features move wl1251 to it's own directory,
drivers/net/wireless/wl1251.

There are no functional changes, only moving of files. One regression
is that Kconfig won't be updated automatically and user needs to enable
wl1251 manually with an older config file.

Signed-off-by: Kalle Valo <kvalo@adurom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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 00000000000..5ed47c8373d
--- /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;
+}
+