mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled

[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / mvm / scan.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
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 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 *
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 * it under the terms of version 2 of the GNU General Public License as
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 *  Intel Linux Wireless <ilw@linux.intel.com>
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#include <linux/etherdevice.h>
#include <net/mac80211.h>

#include "mvm.h"
#include "iwl-eeprom-parse.h"
#include "fw-api-scan.h"

#define IWL_PLCP_QUIET_THRESH 1
#define IWL_ACTIVE_QUIET_TIME 10

static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
{
        u16 rx_chain;
        u8 rx_ant = iwl_fw_valid_rx_ant(mvm->fw);

        rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
        rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
        rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
        rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
        return cpu_to_le16(rx_chain);
}

static inline __le32 iwl_mvm_scan_max_out_time(struct ieee80211_vif *vif)
{
        if (vif->bss_conf.assoc)
                return cpu_to_le32(200 * 1024);
        else
                return 0;
}

static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif)
{
        if (vif->bss_conf.assoc)
                return cpu_to_le32(vif->bss_conf.beacon_int);
        else
                return 0;
}

static inline __le32
iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
{
        if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
                return cpu_to_le32(PHY_BAND_24);
        else
                return cpu_to_le32(PHY_BAND_5);
}

static inline __le32
iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
                          bool no_cck)
{
        u32 tx_ant;

        mvm->scan_last_antenna_idx =
                iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
                                     mvm->scan_last_antenna_idx);
        tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;

        if (band == IEEE80211_BAND_2GHZ && !no_cck)
                return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
                                   tx_ant);
        else
                return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
}

/*
 * We insert the SSIDs in an inverted order, because the FW will
 * invert it back. The most prioritized SSID, which is first in the
 * request list, is not copied here, but inserted directly to the probe
 * request.
 */
static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
                                    struct cfg80211_scan_request *req)
{
        int fw_idx, req_idx;

        for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx > 0;
             req_idx--, fw_idx++) {
                cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
                cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
                memcpy(cmd->direct_scan[fw_idx].ssid,
                       req->ssids[req_idx].ssid,
                       req->ssids[req_idx].ssid_len);
        }
}

/*
 * If req->n_ssids > 0, it means we should do an active scan.
 * In case of active scan w/o directed scan, we receive a zero-length SSID
 * just to notify that this scan is active and not passive.
 * In order to notify the FW of the number of SSIDs we wish to scan (including
 * the zero-length one), we need to set the corresponding bits in chan->type,
 * one for each SSID, and set the active bit (first). The first SSID is already
 * included in the probe template, so we need to set only req->n_ssids - 1 bits
 * in addition to the first bit.
 */
static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
{
        if (band == IEEE80211_BAND_2GHZ)
                return 30  + 3 * (n_ssids + 1);
        return 20  + 2 * (n_ssids + 1);
}

static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
{
        return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
}

static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
                                       struct cfg80211_scan_request *req)
{
        u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band);
        u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band,
                                                    req->n_ssids);
        struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
                (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
        int i;

        for (i = 0; i < cmd->channel_count; i++) {
                chan->channel = cpu_to_le16(req->channels[i]->hw_value);
                chan->type = cpu_to_le32(BIT(req->n_ssids) - 1);
                if (req->channels[i]->flags & IEEE80211_CHAN_PASSIVE_SCAN)
                        chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
                chan->active_dwell = cpu_to_le16(active_dwell);
                chan->passive_dwell = cpu_to_le16(passive_dwell);
                chan->iteration_count = cpu_to_le16(1);
                chan++;
        }
}

/*
 * Fill in probe request with the following parameters:
 * TA is our vif HW address, which mac80211 ensures we have.
 * Packet is broadcasted, so this is both SA and DA.
 * The probe request IE is made out of two: first comes the most prioritized
 * SSID if a directed scan is requested. Second comes whatever extra
 * information was given to us as the scan request IE.
 */
static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
                                  int n_ssids, const u8 *ssid, int ssid_len,
                                  const u8 *ie, int ie_len,
                                  int left)
{
        int len = 0;
        u8 *pos = NULL;

        /* Make sure there is enough space for the probe request,
         * two mandatory IEs and the data */
        left -= 24;
        if (left < 0)
                return 0;

        frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
        eth_broadcast_addr(frame->da);
        memcpy(frame->sa, ta, ETH_ALEN);
        eth_broadcast_addr(frame->bssid);
        frame->seq_ctrl = 0;

        len += 24;

        /* for passive scans, no need to fill anything */
        if (n_ssids == 0)
                return (u16)len;

        /* points to the payload of the request */
        pos = &frame->u.probe_req.variable[0];

        /* fill in our SSID IE */
        left -= ssid_len + 2;
        if (left < 0)
                return 0;
        *pos++ = WLAN_EID_SSID;
        *pos++ = ssid_len;
        if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
                memcpy(pos, ssid, ssid_len);
                pos += ssid_len;
        }

        len += ssid_len + 2;

        if (WARN_ON(left < ie_len))
                return len;

        if (ie && ie_len) {
                memcpy(pos, ie, ie_len);
                len += ie_len;
        }

        return (u16)len;
}

int iwl_mvm_scan_request(struct iwl_mvm *mvm,
                         struct ieee80211_vif *vif,
                         struct cfg80211_scan_request *req)
{
        struct iwl_host_cmd hcmd = {
                .id = SCAN_REQUEST_CMD,
                .len = { 0, },
                .data = { mvm->scan_cmd, },
                .flags = CMD_SYNC,
                .dataflags = { IWL_HCMD_DFL_NOCOPY, },
        };
        struct iwl_scan_cmd *cmd = mvm->scan_cmd;
        int ret;
        u32 status;
        int ssid_len = 0;
        u8 *ssid = NULL;

        lockdep_assert_held(&mvm->mutex);
        BUG_ON(mvm->scan_cmd == NULL);

        IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
        mvm->scan_status = IWL_MVM_SCAN_OS;
        memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
               mvm->fw->ucode_capa.max_probe_length +
               (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));

        cmd->channel_count = (u8)req->n_channels;
        cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
        cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
        cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
        cmd->max_out_time = iwl_mvm_scan_max_out_time(vif);
        cmd->suspend_time = iwl_mvm_scan_suspend_time(vif);
        cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
        cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
                                        MAC_FILTER_IN_BEACON);

        if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
                cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
        else
                cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);

        cmd->repeats = cpu_to_le32(1);

        /*
         * If the user asked for passive scan, don't change to active scan if
         * you see any activity on the channel - remain passive.
         */
        if (req->n_ssids > 0) {
                cmd->passive2active = cpu_to_le16(1);
                cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
                ssid = req->ssids[0].ssid;
                ssid_len = req->ssids[0].ssid_len;
        } else {
                cmd->passive2active = 0;
                cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
        }

        iwl_mvm_scan_fill_ssids(cmd, req);

        cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
                                           TX_CMD_FLG_BT_DIS);
        cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
        cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
        cmd->tx_cmd.rate_n_flags =
                        iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
                                                  req->no_cck);

        cmd->tx_cmd.len =
                cpu_to_le16(iwl_mvm_fill_probe_req(
                            (struct ieee80211_mgmt *)cmd->data,
                            vif->addr,
                            req->n_ssids, ssid, ssid_len,
                            req->ie, req->ie_len,
                            mvm->fw->ucode_capa.max_probe_length));

        iwl_mvm_scan_fill_channels(cmd, req);

        cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
                le16_to_cpu(cmd->tx_cmd.len) +
                (cmd->channel_count * sizeof(struct iwl_scan_channel)));
        hcmd.len[0] = le16_to_cpu(cmd->len);

        status = SCAN_RESPONSE_OK;
        ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
        if (!ret && status == SCAN_RESPONSE_OK) {
                IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
        } else {
                /*
                 * If the scan failed, it usually means that the FW was unable
                 * to allocate the time events. Warn on it, but maybe we
                 * should try to send the command again with different params.
                 */
                IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
                        status, ret);
                mvm->scan_status = IWL_MVM_SCAN_NONE;
                ret = -EIO;
        }
        return ret;
}

int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
                          struct iwl_device_cmd *cmd)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_cmd_response *resp = (void *)pkt->data;

        IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
                       le32_to_cpu(resp->status));
        return 0;
}

int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
                          struct iwl_device_cmd *cmd)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_scan_complete_notif *notif = (void *)pkt->data;

        IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
                       notif->status, notif->scanned_channels);

        mvm->scan_status = IWL_MVM_SCAN_NONE;
        ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);

        return 0;
}

static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
                                     struct iwl_rx_packet *pkt, void *data)
{
        struct iwl_mvm *mvm =
                container_of(notif_wait, struct iwl_mvm, notif_wait);
        struct iwl_scan_complete_notif *notif;
        u32 *resp;

        switch (pkt->hdr.cmd) {
        case SCAN_ABORT_CMD:
                resp = (void *)pkt->data;
                if (*resp == CAN_ABORT_STATUS) {
                        IWL_DEBUG_SCAN(mvm,
                                       "Scan can be aborted, wait until completion\n");
                        return false;
                }

                /*
                 * If scan cannot be aborted, it means that we had a
                 * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
                 * ieee80211_scan_completed already.
                 */
                IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
                               *resp);
                return true;

        case SCAN_COMPLETE_NOTIFICATION:
                notif = (void *)pkt->data;
                IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
                               notif->status);
                return true;

        default:
                WARN_ON(1);
                return false;
        };
}

void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
{
        struct iwl_notification_wait wait_scan_abort;
        static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
                                               SCAN_COMPLETE_NOTIFICATION };
        int ret;

        if (mvm->scan_status == IWL_MVM_SCAN_NONE)
                return;

        iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
                                   scan_abort_notif,
                                   ARRAY_SIZE(scan_abort_notif),
                                   iwl_mvm_scan_abort_notif, NULL);

        ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD,
                                   CMD_SYNC | CMD_SEND_IN_RFKILL, 0, NULL);
        if (ret) {
                IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
                /* mac80211's state will be cleaned in the fw_restart flow */
                goto out_remove_notif;
        }

        ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
        if (ret)
                IWL_ERR(mvm, "%s - failed on timeout\n", __func__);

        return;

out_remove_notif:
        iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
}