/* Copyright (C) 2010 Willow Garage Copyright (C) 2004 - 2010 Ivo van Doorn This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Module: rt2x00lib Abstract: rt2x00 generic device routines. */ #include #include #include #include "rt2x00.h" #include "rt2x00lib.h" /* * Radio control handlers. */ int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev) { int status; /* * Don't enable the radio twice. * And check if the hardware button has been disabled. */ if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) return 0; /* * Initialize all data queues. */ rt2x00queue_init_queues(rt2x00dev); /* * Enable radio. */ status = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON); if (status) return status; rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON); rt2x00leds_led_radio(rt2x00dev, true); rt2x00led_led_activity(rt2x00dev, true); set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags); /* * Enable RX. */ rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON); /* * Start watchdog monitoring. */ rt2x00link_start_watchdog(rt2x00dev); /* * Start the TX queues. */ ieee80211_wake_queues(rt2x00dev->hw); return 0; } void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev) { if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) return; /* * Stop the TX queues in mac80211. */ ieee80211_stop_queues(rt2x00dev->hw); rt2x00queue_stop_queues(rt2x00dev); /* * Stop watchdog monitoring. */ rt2x00link_stop_watchdog(rt2x00dev); /* * Disable RX. */ rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF); /* * Disable radio. */ rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF); rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF); rt2x00led_led_activity(rt2x00dev, false); rt2x00leds_led_radio(rt2x00dev, false); } void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state) { /* * When we are disabling the RX, we should also stop the link tuner. */ if (state == STATE_RADIO_RX_OFF) rt2x00link_stop_tuner(rt2x00dev); rt2x00dev->ops->lib->set_device_state(rt2x00dev, state); /* * When we are enabling the RX, we should also start the link tuner. */ if (state == STATE_RADIO_RX_ON) rt2x00link_start_tuner(rt2x00dev); } static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac, struct ieee80211_vif *vif) { struct rt2x00_dev *rt2x00dev = data; struct rt2x00_intf *intf = vif_to_intf(vif); int delayed_flags; /* * Copy all data we need during this action under the protection * of a spinlock. Otherwise race conditions might occur which results * into an invalid configuration. */ spin_lock(&intf->lock); delayed_flags = intf->delayed_flags; intf->delayed_flags = 0; spin_unlock(&intf->lock); /* * It is possible the radio was disabled while the work had been * scheduled. If that happens we should return here immediately, * note that in the spinlock protected area above the delayed_flags * have been cleared correctly. */ if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) return; if (delayed_flags & DELAYED_UPDATE_BEACON) rt2x00queue_update_beacon(rt2x00dev, vif, true); } static void rt2x00lib_intf_scheduled(struct work_struct *work) { struct rt2x00_dev *rt2x00dev = container_of(work, struct rt2x00_dev, intf_work); /* * Iterate over each interface and perform the * requested configurations. */ ieee80211_iterate_active_interfaces(rt2x00dev->hw, rt2x00lib_intf_scheduled_iter, rt2x00dev); } /* * Interrupt context handlers. */ static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac, struct ieee80211_vif *vif) { struct rt2x00_dev *rt2x00dev = data; struct sk_buff *skb; /* * Only AP mode interfaces do broad- and multicast buffering */ if (vif->type != NL80211_IFTYPE_AP) return; /* * Send out buffered broad- and multicast frames */ skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif); while (skb) { rt2x00mac_tx(rt2x00dev->hw, skb); skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif); } } static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac, struct ieee80211_vif *vif) { struct rt2x00_dev *rt2x00dev = data; if (vif->type != NL80211_IFTYPE_AP && vif->type != NL80211_IFTYPE_ADHOC && vif->type != NL80211_IFTYPE_MESH_POINT && vif->type != NL80211_IFTYPE_WDS) return; rt2x00queue_update_beacon(rt2x00dev, vif, true); } void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev) { if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) return; /* send buffered bc/mc frames out for every bssid */ ieee80211_iterate_active_interfaces(rt2x00dev->hw, rt2x00lib_bc_buffer_iter, rt2x00dev); /* * Devices with pre tbtt interrupt don't need to update the beacon * here as they will fetch the next beacon directly prior to * transmission. */ if (test_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags)) return; /* fetch next beacon */ ieee80211_iterate_active_interfaces(rt2x00dev->hw, rt2x00lib_beaconupdate_iter, rt2x00dev); } EXPORT_SYMBOL_GPL(rt2x00lib_beacondone); void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev) { if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) return; /* fetch next beacon */ ieee80211_iterate_active_interfaces(rt2x00dev->hw, rt2x00lib_beaconupdate_iter, rt2x00dev); } EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt); void rt2x00lib_dmadone(struct queue_entry *entry) { rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE); } EXPORT_SYMBOL_GPL(rt2x00lib_dmadone); void rt2x00lib_txdone(struct queue_entry *entry, struct txdone_entry_desc *txdesc) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb); struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); enum data_queue_qid qid = skb_get_queue_mapping(entry->skb); unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb); u8 rate_idx, rate_flags, retry_rates; u8 skbdesc_flags = skbdesc->flags; unsigned int i; bool success; /* * Unmap the skb. */ rt2x00queue_unmap_skb(entry); /* * Remove the extra tx headroom from the skb. */ skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom); /* * Signal that the TX descriptor is no longer in the skb. */ skbdesc->flags &= ~SKBDESC_DESC_IN_SKB; /* * Remove L2 padding which was added during */ if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags)) rt2x00queue_remove_l2pad(entry->skb, header_length); /* * If the IV/EIV data was stripped from the frame before it was * passed to the hardware, we should now reinsert it again because * mac80211 will expect the same data to be present it the * frame as it was passed to us. */ if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) rt2x00crypto_tx_insert_iv(entry->skb, header_length); /* * Send frame to debugfs immediately, after this call is completed * we are going to overwrite the skb->cb array. */ rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb); /* * Determine if the frame has been successfully transmitted. */ success = test_bit(TXDONE_SUCCESS, &txdesc->flags) || test_bit(TXDONE_UNKNOWN, &txdesc->flags); /* * Update TX statistics. */ rt2x00dev->link.qual.tx_success += success; rt2x00dev->link.qual.tx_failed += !success; rate_idx = skbdesc->tx_rate_idx; rate_flags = skbdesc->tx_rate_flags; retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ? (txdesc->retry + 1) : 1; /* * Initialize TX status */ memset(&tx_info->status, 0, sizeof(tx_info->status)); tx_info->status.ack_signal = 0; /* * Frame was send with retries, hardware tried * different rates to send out the frame, at each * retry it lowered the rate 1 step except when the * lowest rate was used. */ for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) { tx_info->status.rates[i].idx = rate_idx - i; tx_info->status.rates[i].flags = rate_flags; if (rate_idx - i == 0) { /* * The lowest rate (index 0) was used until the * number of max retries was reached. */ tx_info->status.rates[i].count = retry_rates - i; i++; break; } tx_info->status.rates[i].count = 1; } if (i < (IEEE80211_TX_MAX_RATES - 1)) tx_info->status.rates[i].idx = -1; /* terminate */ if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) { if (success) tx_info->flags |= IEEE80211_TX_STAT_ACK; else rt2x00dev->low_level_stats.dot11ACKFailureCount++; } /* * Every single frame has it's own tx status, hence report * every frame as ampdu of size 1. * * TODO: if we can find out how many frames were aggregated * by the hw we could provide the real ampdu_len to mac80211 * which would allow the rc algorithm to better decide on * which rates are suitable. */ if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) { tx_info->flags |= IEEE80211_TX_STAT_AMPDU; tx_info->status.ampdu_len = 1; tx_info->status.ampdu_ack_len = success ? 1 : 0; } if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) { if (success) rt2x00dev->low_level_stats.dot11RTSSuccessCount++; else rt2x00dev->low_level_stats.dot11RTSFailureCount++; } /* * Only send the status report to mac80211 when it's a frame * that originated in mac80211. If this was a extra frame coming * through a mac80211 library call (RTS/CTS) then we should not * send the status report back. */ if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) ieee80211_tx_status(rt2x00dev->hw, entry->skb); else dev_kfree_skb_any(entry->skb); /* * Make this entry available for reuse. */ entry->skb = NULL; entry->flags = 0; rt2x00dev->ops->lib->clear_entry(entry); rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE); /* * If the data queue was below the threshold before the txdone * handler we must make sure the packet queue in the mac80211 stack * is reenabled when the txdone handler has finished. */ if (!rt2x00queue_threshold(entry->queue)) ieee80211_wake_queue(rt2x00dev->hw, qid); } EXPORT_SYMBOL_GPL(rt2x00lib_txdone); void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status) { struct txdone_entry_desc txdesc; txdesc.flags = 0; __set_bit(status, &txdesc.flags); txdesc.retry = 0; rt2x00lib_txdone(entry, &txdesc); } EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo); static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev, struct rxdone_entry_desc *rxdesc) { struct ieee80211_supported_band *sband; const struct rt2x00_rate *rate; unsigned int i; int signal; int type; /* * For non-HT rates the MCS value needs to contain the * actually used rate modulation (CCK or OFDM). */ if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS) signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal); else signal = rxdesc->signal; type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK); sband = &rt2x00dev->bands[rt2x00dev->curr_band]; for (i = 0; i < sband->n_bitrates; i++) { rate = rt2x00_get_rate(sband->bitrates[i].hw_value); if (((type == RXDONE_SIGNAL_PLCP) && (rate->plcp == signal)) || ((type == RXDONE_SIGNAL_BITRATE) && (rate->bitrate == signal)) || ((type == RXDONE_SIGNAL_MCS) && (rate->mcs == signal))) { return i; } } WARNING(rt2x00dev, "Frame received with unrecognized signal, " "signal=0x%.4x, type=%d.\n", signal, type); return 0; } void rt2x00lib_rxdone(struct queue_entry *entry) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct rxdone_entry_desc rxdesc; struct sk_buff *skb; struct ieee80211_rx_status *rx_status; unsigned int header_length; int rate_idx; if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags)) goto submit_entry; /* * Allocate a new sk_buffer. If no new buffer available, drop the * received frame and reuse the existing buffer. */ skb = rt2x00queue_alloc_rxskb(entry); if (!skb) return; /* * Unmap the skb. */ rt2x00queue_unmap_skb(entry); /* * Extract the RXD details. */ memset(&rxdesc, 0, sizeof(rxdesc)); rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc); /* * The data behind the ieee80211 header must be * aligned on a 4 byte boundary. */ header_length = ieee80211_get_hdrlen_from_skb(entry->skb); /* * Hardware might have stripped the IV/EIV/ICV data, * in that case it is possible that the data was * provided separately (through hardware descriptor) * in which case we should reinsert the data into the frame. */ if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) && (rxdesc.flags & RX_FLAG_IV_STRIPPED)) rt2x00crypto_rx_insert_iv(entry->skb, header_length, &rxdesc); else if (header_length && (rxdesc.size > header_length) && (rxdesc.dev_flags & RXDONE_L2PAD)) rt2x00queue_remove_l2pad(entry->skb, header_length); else rt2x00queue_align_payload(entry->skb, header_length); /* Trim buffer to correct size */ skb_trim(entry->skb, rxdesc.size); /* * Check if the frame was received using HT. In that case, * the rate is the MCS index and should be passed to mac80211 * directly. Otherwise we need to translate the signal to * the correct bitrate index. */ if (rxdesc.rate_mode == RATE_MODE_CCK || rxdesc.rate_mode == RATE_MODE_OFDM) { rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc); } else { rxdesc.flags |= RX_FLAG_HT; rate_idx = rxdesc.signal; } /* * Update extra components */ rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc); rt2x00debug_update_crypto(rt2x00dev, &rxdesc); rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb); /* * Initialize RX status information, and send frame * to mac80211. */ rx_status = IEEE80211_SKB_RXCB(entry->skb); rx_status->mactime = rxdesc.timestamp; rx_status->band = rt2x00dev->curr_band; rx_status->freq = rt2x00dev->curr_freq; rx_status->rate_idx = rate_idx; rx_status->signal = rxdesc.rssi; rx_status->flag = rxdesc.flags; rx_status->antenna = rt2x00dev->link.ant.active.rx; ieee80211_rx_ni(rt2x00dev->hw, entry->skb); /* * Replace the skb with the freshly allocated one. */ entry->skb = skb; submit_entry: rt2x00dev->ops->lib->clear_entry(entry); rt2x00queue_index_inc(entry->queue, Q_INDEX); rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE); } EXPORT_SYMBOL_GPL(rt2x00lib_rxdone); /* * Driver initialization handlers. */ const struct rt2x00_rate rt2x00_supported_rates[12] = { { .flags = DEV_RATE_CCK, .bitrate = 10, .ratemask = BIT(0), .plcp = 0x00, .mcs = RATE_MCS(RATE_MODE_CCK, 0), }, { .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE, .bitrate = 20, .ratemask = BIT(1), .plcp = 0x01, .mcs = RATE_MCS(RATE_MODE_CCK, 1), }, { .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE, .bitrate = 55, .ratemask = BIT(2), .plcp = 0x02, .mcs = RATE_MCS(RATE_MODE_CCK, 2), }, { .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE, .bitrate = 110, .ratemask = BIT(3), .plcp = 0x03, .mcs = RATE_MCS(RATE_MODE_CCK, 3), }, { .flags = DEV_RATE_OFDM, .bitrate = 60, .ratemask = BIT(4), .plcp = 0x0b, .mcs = RATE_MCS(RATE_MODE_OFDM, 0), }, { .flags = DEV_RATE_OFDM, .bitrate = 90, .ratemask = BIT(5), .plcp = 0x0f, .mcs = RATE_MCS(RATE_MODE_OFDM, 1), }, { .flags = DEV_RATE_OFDM, .bitrate = 120, .ratemask = BIT(6), .plcp = 0x0a, .mcs = RATE_MCS(RATE_MODE_OFDM, 2), }, { .flags = DEV_RATE_OFDM, .bitrate = 180, .ratemask = BIT(7), .plcp = 0x0e, .mcs = RATE_MCS(RATE_MODE_OFDM, 3), }, { .flags = DEV_RATE_OFDM, .bitrate = 240, .ratemask = BIT(8), .plcp = 0x09, .mcs = RATE_MCS(RATE_MODE_OFDM, 4), }, { .flags = DEV_RATE_OFDM, .bitrate = 360, .ratemask = BIT(9), .plcp = 0x0d, .mcs = RATE_MCS(RATE_MODE_OFDM, 5), }, { .flags = DEV_RATE_OFDM, .bitrate = 480, .ratemask = BIT(10), .plcp = 0x08, .mcs = RATE_MCS(RATE_MODE_OFDM, 6), }, { .flags = DEV_RATE_OFDM, .bitrate = 540, .ratemask = BIT(11), .plcp = 0x0c, .mcs = RATE_MCS(RATE_MODE_OFDM, 7), }, }; static void rt2x00lib_channel(struct ieee80211_channel *entry, const int channel, const int tx_power, const int value) { entry->center_freq = ieee80211_channel_to_frequency(channel); entry->hw_value = value; entry->max_power = tx_power; entry->max_antenna_gain = 0xff; } static void rt2x00lib_rate(struct ieee80211_rate *entry, const u16 index, const struct rt2x00_rate *rate) { entry->flags = 0; entry->bitrate = rate->bitrate; entry->hw_value =index; entry->hw_value_short = index; if (rate->flags & DEV_RATE_SHORT_PREAMBLE) entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE; } static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev, struct hw_mode_spec *spec) { struct ieee80211_hw *hw = rt2x00dev->hw; struct ieee80211_channel *channels; struct ieee80211_rate *rates; unsigned int num_rates; unsigned int i; num_rates = 0; if (spec->supported_rates & SUPPORT_RATE_CCK) num_rates += 4; if (spec->supported_rates & SUPPORT_RATE_OFDM) num_rates += 8; channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL); if (!channels) return -ENOMEM; rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL); if (!rates) goto exit_free_channels; /* * Initialize Rate list. */ for (i = 0; i < num_rates; i++) rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i)); /* * Initialize Channel list. */ for (i = 0; i < spec->num_channels; i++) { rt2x00lib_channel(&channels[i], spec->channels[i].channel, spec->channels_info[i].max_power, i); } /* * Intitialize 802.11b, 802.11g * Rates: CCK, OFDM. * Channels: 2.4 GHz */ if (spec->supported_bands & SUPPORT_BAND_2GHZ) { rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14; rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates; rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels; rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates; hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &rt2x00dev->bands[IEEE80211_BAND_2GHZ]; memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap, &spec->ht, sizeof(spec->ht)); } /* * Intitialize 802.11a * Rates: OFDM. * Channels: OFDM, UNII, HiperLAN2. */ if (spec->supported_bands & SUPPORT_BAND_5GHZ) { rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels = spec->num_channels - 14; rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates = num_rates - 4; rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14]; rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4]; hw->wiphy->bands[IEEE80211_BAND_5GHZ] = &rt2x00dev->bands[IEEE80211_BAND_5GHZ]; memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap, &spec->ht, sizeof(spec->ht)); } return 0; exit_free_channels: kfree(channels); ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n"); return -ENOMEM; } static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev) { if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags)) ieee80211_unregister_hw(rt2x00dev->hw); if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) { kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels); kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates); rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL; rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL; } kfree(rt2x00dev->spec.channels_info); } static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev) { struct hw_mode_spec *spec = &rt2x00dev->spec; int status; if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags)) return 0; /* * Initialize HW modes. */ status = rt2x00lib_probe_hw_modes(rt2x00dev, spec); if (status) return status; /* * Initialize HW fields. */ rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues; /* * Initialize extra TX headroom required. */ rt2x00dev->hw->extra_tx_headroom = max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM, rt2x00dev->ops->extra_tx_headroom); /* * Take TX headroom required for alignment into account. */ if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags)) rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE; else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags)) rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE; /* * Allocate tx status FIFO for driver use. */ if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags) && rt2x00dev->ops->lib->txstatus_tasklet) { /* * Allocate txstatus fifo and tasklet, we use a size of 512 * for the kfifo which is big enough to store 512/4=128 tx * status reports. In the worst case (tx status for all tx * queues gets reported before we've got a chance to handle * them) 24*4=384 tx status reports need to be cached. */ status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512, GFP_KERNEL); if (status) return status; /* tasklet for processing the tx status reports. */ tasklet_init(&rt2x00dev->txstatus_tasklet, rt2x00dev->ops->lib->txstatus_tasklet, (unsigned long)rt2x00dev); } /* * Register HW. */ status = ieee80211_register_hw(rt2x00dev->hw); if (status) return status; set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags); return 0; } /* * Initialization/uninitialization handlers. */ static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev) { if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags)) return; /* * Unregister extra components. */ rt2x00rfkill_unregister(rt2x00dev); /* * Allow the HW to uninitialize. */ rt2x00dev->ops->lib->uninitialize(rt2x00dev); /* * Free allocated queue entries. */ rt2x00queue_uninitialize(rt2x00dev); } static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev) { int status; if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags)) return 0; /* * Allocate all queue entries. */ status = rt2x00queue_initialize(rt2x00dev); if (status) return status; /* * Initialize the device. */ status = rt2x00dev->ops->lib->initialize(rt2x00dev); if (status) { rt2x00queue_uninitialize(rt2x00dev); return status; } set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags); /* * Register the extra components. */ rt2x00rfkill_register(rt2x00dev); return 0; } int rt2x00lib_start(struct rt2x00_dev *rt2x00dev) { int retval; if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) return 0; /* * If this is the first interface which is added, * we should load the firmware now. */ retval = rt2x00lib_load_firmware(rt2x00dev); if (retval) return retval; /* * Initialize the device. */ retval = rt2x00lib_initialize(rt2x00dev); if (retval) return retval; rt2x00dev->intf_ap_count = 0; rt2x00dev->intf_sta_count = 0; rt2x00dev->intf_associated = 0; /* Enable the radio */ retval = rt2x00lib_enable_radio(rt2x00dev); if (retval) return retval; set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags); return 0; } void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev) { if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) return; /* * Perhaps we can add something smarter here, * but for now just disabling the radio should do. */ rt2x00lib_disable_radio(rt2x00dev); rt2x00dev->intf_ap_count = 0; rt2x00dev->intf_sta_count = 0; rt2x00dev->intf_associated = 0; } /* * driver allocation handlers. */ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev) { int retval = -ENOMEM; mutex_init(&rt2x00dev->csr_mutex); set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); /* * Make room for rt2x00_intf inside the per-interface * structure ieee80211_vif. */ rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf); /* * Determine which operating modes are supported, all modes * which require beaconing, depend on the availability of * beacon entries. */ rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION); if (rt2x00dev->ops->bcn->entry_num > 0) rt2x00dev->hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_ADHOC) | BIT(NL80211_IFTYPE_AP) | BIT(NL80211_IFTYPE_MESH_POINT) | BIT(NL80211_IFTYPE_WDS); /* * Initialize configuration work. */ INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled); /* * Let the driver probe the device to detect the capabilities. */ retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev); if (retval) { ERROR(rt2x00dev, "Failed to allocate device.\n"); goto exit; } /* * Allocate queue array. */ retval = rt2x00queue_allocate(rt2x00dev); if (retval) goto exit; /* * Initialize ieee80211 structure. */ retval = rt2x00lib_probe_hw(rt2x00dev); if (retval) { ERROR(rt2x00dev, "Failed to initialize hw.\n"); goto exit; } /* * Register extra components. */ rt2x00link_register(rt2x00dev); rt2x00leds_register(rt2x00dev); rt2x00debug_register(rt2x00dev); return 0; exit: rt2x00lib_remove_dev(rt2x00dev); return retval; } EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev); void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev) { clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); /* * Disable radio. */ rt2x00lib_disable_radio(rt2x00dev); /* * Stop all work. */ cancel_work_sync(&rt2x00dev->intf_work); cancel_work_sync(&rt2x00dev->rxdone_work); cancel_work_sync(&rt2x00dev->txdone_work); /* * Free the tx status fifo. */ kfifo_free(&rt2x00dev->txstatus_fifo); /* * Kill the tx status tasklet. */ tasklet_kill(&rt2x00dev->txstatus_tasklet); /* * Uninitialize device. */ rt2x00lib_uninitialize(rt2x00dev); /* * Free extra components */ rt2x00debug_deregister(rt2x00dev); rt2x00leds_unregister(rt2x00dev); /* * Free ieee80211_hw memory. */ rt2x00lib_remove_hw(rt2x00dev); /* * Free firmware image. */ rt2x00lib_free_firmware(rt2x00dev); /* * Free queue structures. */ rt2x00queue_free(rt2x00dev); } EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev); /* * Device state handlers */ #ifdef CONFIG_PM int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state) { NOTICE(rt2x00dev, "Going to sleep.\n"); /* * Prevent mac80211 from accessing driver while suspended. */ if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return 0; /* * Cleanup as much as possible. */ rt2x00lib_uninitialize(rt2x00dev); /* * Suspend/disable extra components. */ rt2x00leds_suspend(rt2x00dev); rt2x00debug_deregister(rt2x00dev); /* * Set device mode to sleep for power management, * on some hardware this call seems to consistently fail. * From the specifications it is hard to tell why it fails, * and if this is a "bad thing". * Overall it is safe to just ignore the failure and * continue suspending. The only downside is that the * device will not be in optimal power save mode, but with * the radio and the other components already disabled the * device is as good as disabled. */ if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP)) WARNING(rt2x00dev, "Device failed to enter sleep state, " "continue suspending.\n"); return 0; } EXPORT_SYMBOL_GPL(rt2x00lib_suspend); int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev) { NOTICE(rt2x00dev, "Waking up.\n"); /* * Restore/enable extra components. */ rt2x00debug_register(rt2x00dev); rt2x00leds_resume(rt2x00dev); /* * We are ready again to receive requests from mac80211. */ set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); return 0; } EXPORT_SYMBOL_GPL(rt2x00lib_resume); #endif /* CONFIG_PM */ /* * rt2x00lib module information. */ MODULE_AUTHOR(DRV_PROJECT); MODULE_VERSION(DRV_VERSION); MODULE_DESCRIPTION("rt2x00 library"); MODULE_LICENSE("GPL");