diff options
Diffstat (limited to 'drivers/net/wireless/wl1251/ps.c')
| -rw-r--r-- | drivers/net/wireless/wl1251/ps.c | 194 |
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; +} + |