2 * Mac80211 power management API for ST-Ericsson CW1200 drivers
4 * Copyright (c) 2011, ST-Ericsson
5 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/if_ether.h>
20 #define CW1200_BEACON_SKIPPING_MULTIPLIER 3
22 struct cw1200_udp_port_filter {
23 struct wsm_udp_port_filter_hdr hdr;
24 /* Up to 4 filters are allowed. */
25 struct wsm_udp_port_filter filters[WSM_MAX_FILTER_ELEMENTS];
28 struct cw1200_ether_type_filter {
29 struct wsm_ether_type_filter_hdr hdr;
30 /* Up to 4 filters are allowed. */
31 struct wsm_ether_type_filter filters[WSM_MAX_FILTER_ELEMENTS];
34 static struct cw1200_udp_port_filter cw1200_udp_port_filter_on = {
38 .action = WSM_FILTER_ACTION_FILTER_OUT,
39 .type = WSM_FILTER_PORT_TYPE_DST,
40 .port = __cpu_to_le16(67), /* DHCP Bootps */
43 .action = WSM_FILTER_ACTION_FILTER_OUT,
44 .type = WSM_FILTER_PORT_TYPE_DST,
45 .port = __cpu_to_le16(68), /* DHCP Bootpc */
50 static struct wsm_udp_port_filter_hdr cw1200_udp_port_filter_off = {
55 #define ETH_P_WAPI 0x88B4
58 static struct cw1200_ether_type_filter cw1200_ether_type_filter_on = {
62 .action = WSM_FILTER_ACTION_FILTER_IN,
63 .type = __cpu_to_le16(ETH_P_IP),
66 .action = WSM_FILTER_ACTION_FILTER_IN,
67 .type = __cpu_to_le16(ETH_P_PAE),
70 .action = WSM_FILTER_ACTION_FILTER_IN,
71 .type = __cpu_to_le16(ETH_P_WAPI),
74 .action = WSM_FILTER_ACTION_FILTER_IN,
75 .type = __cpu_to_le16(ETH_P_ARP),
80 static struct wsm_ether_type_filter_hdr cw1200_ether_type_filter_off = {
85 struct cw1200_suspend_state {
86 unsigned long bss_loss_tmo;
87 unsigned long join_tmo;
88 unsigned long direct_probe;
89 unsigned long link_id_gc;
94 static void cw1200_pm_stay_awake_tmo(struct timer_list *unused)
96 /* XXX what's the point of this ? */
99 int cw1200_pm_init(struct cw1200_pm_state *pm,
100 struct cw1200_common *priv)
102 spin_lock_init(&pm->lock);
104 timer_setup(&pm->stay_awake, cw1200_pm_stay_awake_tmo, 0);
109 void cw1200_pm_deinit(struct cw1200_pm_state *pm)
111 del_timer_sync(&pm->stay_awake);
114 void cw1200_pm_stay_awake(struct cw1200_pm_state *pm,
118 spin_lock_bh(&pm->lock);
119 cur_tmo = pm->stay_awake.expires - jiffies;
120 if (!timer_pending(&pm->stay_awake) || cur_tmo < (long)tmo)
121 mod_timer(&pm->stay_awake, jiffies + tmo);
122 spin_unlock_bh(&pm->lock);
125 static long cw1200_suspend_work(struct delayed_work *work)
127 int ret = cancel_delayed_work(work);
130 /* Timer is pending */
131 tmo = work->timer.expires - jiffies;
140 static int cw1200_resume_work(struct cw1200_common *priv,
141 struct delayed_work *work,
147 return queue_delayed_work(priv->workqueue, work, tmo);
150 int cw1200_can_suspend(struct cw1200_common *priv)
152 if (atomic_read(&priv->bh_rx)) {
153 wiphy_dbg(priv->hw->wiphy, "Suspend interrupted.\n");
158 EXPORT_SYMBOL_GPL(cw1200_can_suspend);
160 int cw1200_wow_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
162 struct cw1200_common *priv = hw->priv;
163 struct cw1200_pm_state *pm_state = &priv->pm_state;
164 struct cw1200_suspend_state *state;
167 spin_lock_bh(&pm_state->lock);
168 ret = timer_pending(&pm_state->stay_awake);
169 spin_unlock_bh(&pm_state->lock);
173 /* Do not suspend when datapath is not idle */
174 if (priv->tx_queue_stats.num_queued)
177 /* Make sure there is no configuration requests in progress. */
178 if (!mutex_trylock(&priv->conf_mutex))
181 /* Ensure pending operations are done.
182 * Note also that wow_suspend must return in ~2.5sec, before
183 * watchdog is triggered.
185 if (priv->channel_switch_in_progress)
188 /* Do not suspend when join is pending */
189 if (priv->join_pending)
192 /* Do not suspend when scanning */
193 if (down_trylock(&priv->scan.lock))
197 wsm_lock_tx_async(priv);
199 /* Wait to avoid possible race with bh code.
200 * But do not wait too long...
202 if (wait_event_timeout(priv->bh_evt_wq,
203 !priv->hw_bufs_used, HZ / 10) <= 0)
207 wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_on.hdr);
209 /* Set ethernet frame type filter */
210 wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_on.hdr);
213 state = kzalloc(sizeof(struct cw1200_suspend_state), GFP_KERNEL);
217 /* Change to legacy PS while going to suspend */
218 if (!priv->vif->p2p &&
219 priv->join_status == CW1200_JOIN_STATUS_STA &&
220 priv->powersave_mode.mode != WSM_PSM_PS) {
221 state->prev_ps_mode = priv->powersave_mode.mode;
222 priv->powersave_mode.mode = WSM_PSM_PS;
223 cw1200_set_pm(priv, &priv->powersave_mode);
224 if (wait_event_interruptible_timeout(priv->ps_mode_switch_done,
225 !priv->ps_mode_switch_in_progress, 1*HZ) <= 0) {
230 /* Store delayed work states. */
231 state->bss_loss_tmo =
232 cw1200_suspend_work(&priv->bss_loss_work);
234 cw1200_suspend_work(&priv->join_timeout);
235 state->direct_probe =
236 cw1200_suspend_work(&priv->scan.probe_work);
238 cw1200_suspend_work(&priv->link_id_gc_work);
240 cancel_delayed_work_sync(&priv->clear_recent_scan_work);
241 atomic_set(&priv->recent_scan, 0);
243 /* Enable beacon skipping */
244 if (priv->join_status == CW1200_JOIN_STATUS_STA &&
245 priv->join_dtim_period &&
246 !priv->has_multicast_subscription) {
247 state->beacon_skipping = true;
248 wsm_set_beacon_wakeup_period(priv,
249 priv->join_dtim_period,
250 CW1200_BEACON_SKIPPING_MULTIPLIER * priv->join_dtim_period);
253 /* Stop serving thread */
254 if (cw1200_bh_suspend(priv))
257 ret = timer_pending(&priv->mcast_timeout);
261 /* Store suspend state */
262 pm_state->suspend_state = state;
264 /* Enable IRQ wake */
265 ret = priv->hwbus_ops->power_mgmt(priv->hwbus_priv, true);
267 wiphy_err(priv->hw->wiphy,
268 "PM request failed: %d. WoW is disabled.\n", ret);
269 cw1200_wow_resume(hw);
273 /* Force resume if event is coming from the device. */
274 if (atomic_read(&priv->bh_rx)) {
275 cw1200_wow_resume(hw);
282 WARN_ON(cw1200_bh_resume(priv));
284 cw1200_resume_work(priv, &priv->bss_loss_work,
285 state->bss_loss_tmo);
286 cw1200_resume_work(priv, &priv->join_timeout,
288 cw1200_resume_work(priv, &priv->scan.probe_work,
289 state->direct_probe);
290 cw1200_resume_work(priv, &priv->link_id_gc_work,
295 wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off);
296 wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off);
299 up(&priv->scan.lock);
301 mutex_unlock(&priv->conf_mutex);
305 int cw1200_wow_resume(struct ieee80211_hw *hw)
307 struct cw1200_common *priv = hw->priv;
308 struct cw1200_pm_state *pm_state = &priv->pm_state;
309 struct cw1200_suspend_state *state;
311 state = pm_state->suspend_state;
312 pm_state->suspend_state = NULL;
314 /* Disable IRQ wake */
315 priv->hwbus_ops->power_mgmt(priv->hwbus_priv, false);
317 /* Scan.lock must be released before BH is resumed other way
318 * in case when BSS_LOST command arrived the processing of the
319 * command will be delayed.
321 up(&priv->scan.lock);
323 /* Resume BH thread */
324 WARN_ON(cw1200_bh_resume(priv));
326 /* Restores previous PS mode */
327 if (!priv->vif->p2p && priv->join_status == CW1200_JOIN_STATUS_STA) {
328 priv->powersave_mode.mode = state->prev_ps_mode;
329 cw1200_set_pm(priv, &priv->powersave_mode);
332 if (state->beacon_skipping) {
333 wsm_set_beacon_wakeup_period(priv, priv->beacon_int *
334 priv->join_dtim_period >
335 MAX_BEACON_SKIP_TIME_MS ? 1 :
336 priv->join_dtim_period, 0);
337 state->beacon_skipping = false;
340 /* Resume delayed work */
341 cw1200_resume_work(priv, &priv->bss_loss_work,
342 state->bss_loss_tmo);
343 cw1200_resume_work(priv, &priv->join_timeout,
345 cw1200_resume_work(priv, &priv->scan.probe_work,
346 state->direct_probe);
347 cw1200_resume_work(priv, &priv->link_id_gc_work,
350 /* Remove UDP port filter */
351 wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off);
353 /* Remove ethernet frame type filter */
354 wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off);
356 /* Unlock datapath */
359 /* Unlock configuration mutex */
360 mutex_unlock(&priv->conf_mutex);