wl12xx: add scheduled scan structures and commands

Add firmware command structures, definitions and code to to configure,
start and stop scheduled scans.

Signed-off-by: Luciano Coelho <coelho@ti.com>

2 files changed, 347 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/scan.c b/drivers/net/wireless/wl12xx/scan.c
index 5d0544c8f3f5..d78044f00810 100644
--- a/drivers/net/wireless/wl12xx/scan.c
+++ b/drivers/net/wireless/wl12xx/scan.c
@@ -320,3 +320,236 @@ int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
 
         return 0;
 }
+
+static int
+wl1271_scan_get_sched_scan_channels(struct wl1271 *wl,
+                                    struct cfg80211_sched_scan_request *req,
+                                    struct conn_scan_ch_params *channels,
+                                    u32 band, bool radar, bool passive,
+                                    int start)
+{
+        struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
+        int i, j;
+        u32 flags;
+
+        for (i = 0, j = start;
+             i < req->n_channels && j < MAX_CHANNELS_ALL_BANDS;
+             i++) {
+                flags = req->channels[i]->flags;
+
+                if (!(flags & IEEE80211_CHAN_DISABLED) &&
+                    ((flags & IEEE80211_CHAN_PASSIVE_SCAN) == passive) &&
+                    ((flags & IEEE80211_CHAN_RADAR) == radar) &&
+                    (req->channels[i]->band == band)) {
+                        wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
+                                     req->channels[i]->band,
+                                     req->channels[i]->center_freq);
+                        wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
+                                     req->channels[i]->hw_value,
+                                     req->channels[i]->flags);
+                        wl1271_debug(DEBUG_SCAN, "max_power %d",
+                                     req->channels[i]->max_power);
+
+                        if (flags & IEEE80211_CHAN_PASSIVE_SCAN) {
+                                channels[j].passive_duration =
+                                        cpu_to_le16(c->dwell_time_passive);
+                        } else {
+                                channels[j].min_duration =
+                                        cpu_to_le16(c->min_dwell_time_active);
+                                channels[j].max_duration =
+                                        cpu_to_le16(c->max_dwell_time_active);
+                        }
+                        channels[j].tx_power_att = req->channels[j]->max_power;
+                        channels[j].channel = req->channels[i]->hw_value;
+
+                        j++;
+                }
+        }
+
+        return j - start;
+}
+
+static int
+wl1271_scan_sched_scan_channels(struct wl1271 *wl,
+                                struct cfg80211_sched_scan_request *req,
+                                struct wl1271_cmd_sched_scan_config *cfg)
+{
+        int idx = 0;
+
+        cfg->passive[0] =
+                wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
+                                                    IEEE80211_BAND_2GHZ,
+                                                    false, true, idx);
+        idx += cfg->passive[0];
+
+        cfg->active[0] =
+                wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
+                                                    IEEE80211_BAND_2GHZ,
+                                                    false, false, idx);
+        idx += cfg->active[0];
+
+        cfg->passive[1] =
+                wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
+                                                    IEEE80211_BAND_5GHZ,
+                                                    false, true, idx);
+        idx += cfg->passive[1];
+
+        cfg->active[1] =
+                wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
+                                                    IEEE80211_BAND_5GHZ,
+                                                    false, false, 14);
+        idx += cfg->active[1];
+
+        cfg->dfs =
+                wl1271_scan_get_sched_scan_channels(wl, req, cfg->channels,
+                                                    IEEE80211_BAND_5GHZ,
+                                                    true, false, idx);
+        idx += cfg->dfs;
+
+        wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
+                     cfg->active[0], cfg->passive[0]);
+        wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
+                     cfg->active[1], cfg->passive[1]);
+
+        return idx;
+}
+
+int wl1271_scan_sched_scan_config(struct wl1271 *wl,
+                                  struct cfg80211_sched_scan_request *req,
+                                  struct ieee80211_sched_scan_ies *ies)
+{
+        struct wl1271_cmd_sched_scan_config *cfg = NULL;
+        struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
+        int i, total_channels, ret;
+
+        wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
+
+        cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+        if (!cfg)
+                return -ENOMEM;
+
+        cfg->rssi_threshold = c->rssi_threshold;
+        cfg->snr_threshold  = c->snr_threshold;
+        cfg->n_probe_reqs = c->num_probe_reqs;
+        /* cycles set to 0 it means infinite (until manually stopped) */
+        cfg->cycles = 0;
+        /* report APs when at least 1 is found */
+        cfg->report_after = 1;
+        /* don't stop scanning automatically when something is found */
+        cfg->terminate = 0;
+        cfg->tag = WL1271_SCAN_DEFAULT_TAG;
+        /* don't filter on BSS type */
+        cfg->bss_type = SCAN_BSS_TYPE_ANY;
+        /* currently NL80211 supports only a single interval */
+        for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
+                cfg->intervals[i] = cpu_to_le32(req->interval);
+
+        if (req->ssids[0].ssid_len && req->ssids[0].ssid) {
+                cfg->filter_type = SCAN_SSID_FILTER_SPECIFIC;
+                cfg->ssid_len = req->ssids[0].ssid_len;
+                memcpy(cfg->ssid, req->ssids[0].ssid,
+                       req->ssids[0].ssid_len);
+        } else {
+                cfg->filter_type = SCAN_SSID_FILTER_ANY;
+                cfg->ssid_len = 0;
+        }
+
+        total_channels = wl1271_scan_sched_scan_channels(wl, req, cfg);
+        if (total_channels == 0) {
+                wl1271_error("scan channel list is empty");
+                ret = -EINVAL;
+                goto out;
+        }
+
+        if (cfg->active[0]) {
+                ret = wl1271_cmd_build_probe_req(wl, req->ssids[0].ssid,
+                                                 req->ssids[0].ssid_len,
+                                                 ies->ie[IEEE80211_BAND_2GHZ],
+                                                 ies->len[IEEE80211_BAND_2GHZ],
+                                                 IEEE80211_BAND_2GHZ);
+                if (ret < 0) {
+                        wl1271_error("2.4GHz PROBE request template failed");
+                        goto out;
+                }
+        }
+
+        if (cfg->active[1]) {
+                ret = wl1271_cmd_build_probe_req(wl,  req->ssids[0].ssid,
+                                                 req->ssids[0].ssid_len,
+                                                 ies->ie[IEEE80211_BAND_5GHZ],
+                                                 ies->len[IEEE80211_BAND_5GHZ],
+                                                 IEEE80211_BAND_5GHZ);
+                if (ret < 0) {
+                        wl1271_error("5GHz PROBE request template failed");
+                        goto out;
+                }
+        }
+
+        wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
+
+        ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
+                              sizeof(*cfg), 0);
+        if (ret < 0) {
+                wl1271_error("SCAN configuration failed");
+                goto out;
+        }
+out:
+        kfree(cfg);
+        return ret;
+}
+
+int wl1271_scan_sched_scan_start(struct wl1271 *wl)
+{
+        struct wl1271_cmd_sched_scan_start *start;
+        int ret = 0;
+
+        wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
+
+        start = kzalloc(sizeof(*start), GFP_KERNEL);
+        if (!start)
+                return -ENOMEM;
+
+        start->tag = WL1271_SCAN_DEFAULT_TAG;
+
+        ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
+                              sizeof(*start), 0);
+        if (ret < 0) {
+                wl1271_error("failed to send scan start command");
+                goto out_free;
+        }
+
+out_free:
+        kfree(start);
+        return ret;
+}
+
+void wl1271_scan_sched_scan_results(struct wl1271 *wl)
+{
+        wl1271_debug(DEBUG_SCAN, "got periodic scan results");
+
+        ieee80211_sched_scan_results(wl->hw);
+}
+
+void wl1271_scan_sched_scan_stop(struct wl1271 *wl)
+{
+        struct wl1271_cmd_sched_scan_stop *stop;
+        int ret = 0;
+
+        wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
+
+        /* FIXME: what to do if alloc'ing to stop fails? */
+        stop = kzalloc(sizeof(*stop), GFP_KERNEL);
+        if (!stop) {
+                wl1271_error("failed to alloc memory to send sched scan stop");
+                return;
+        }
+
+        stop->tag = WL1271_SCAN_DEFAULT_TAG;
+
+        ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
+                              sizeof(*stop), 0);
+        if (ret < 0)
+                wl1271_error("failed to send sched scan stop command");
+
+        kfree(stop);
+}
diff --git a/drivers/net/wireless/wl12xx/scan.h b/drivers/net/wireless/wl12xx/scan.h
index 421a750add5a..c83319579ca3 100644
--- a/drivers/net/wireless/wl12xx/scan.h
+++ b/drivers/net/wireless/wl12xx/scan.h
@@ -33,6 +33,12 @@ int wl1271_scan_build_probe_req(struct wl1271 *wl,
                                 const u8 *ie, size_t ie_len, u8 band);
 void wl1271_scan_stm(struct wl1271 *wl);
 void wl1271_scan_complete_work(struct work_struct *work);
+int wl1271_scan_sched_scan_config(struct wl1271 *wl,
+                                     struct cfg80211_sched_scan_request *req,
+                                     struct ieee80211_sched_scan_ies *ies);
+int wl1271_scan_sched_scan_start(struct wl1271 *wl);
+void wl1271_scan_sched_scan_stop(struct wl1271 *wl);
+void wl1271_scan_sched_scan_results(struct wl1271 *wl);
 
 #define WL1271_SCAN_MAX_CHANNELS       24
 #define WL1271_SCAN_DEFAULT_TAG        1
@@ -106,4 +112,112 @@ struct wl1271_cmd_trigger_scan_to {
         __le32 timeout;
 } __packed;
 
+#define MAX_CHANNELS_ALL_BANDS 41
+#define SCAN_MAX_CYCLE_INTERVALS 16
+#define SCAN_MAX_BANDS 3
+
+enum {
+        SCAN_CHANNEL_TYPE_2GHZ_PASSIVE,
+        SCAN_CHANNEL_TYPE_2GHZ_ACTIVE,
+        SCAN_CHANNEL_TYPE_5GHZ_PASSIVE,
+        SCAN_CHANNEL_TYPE_5GHZ_ACTIVE,
+        SCAN_CHANNEL_TYPE_5GHZ_DFS,
+};
+
+enum {
+        SCAN_SSID_FILTER_ANY      = 0,
+        SCAN_SSID_FILTER_SPECIFIC = 1,
+        SCAN_SSID_FILTER_LIST     = 2,
+        SCAN_SSID_FILTER_DISABLED = 3
+};
+
+enum {
+        SCAN_BSS_TYPE_INDEPENDENT,
+        SCAN_BSS_TYPE_INFRASTRUCTURE,
+        SCAN_BSS_TYPE_ANY,
+};
+
+struct conn_scan_ch_params {
+        __le16 min_duration;
+        __le16 max_duration;
+        __le16 passive_duration;
+
+        u8  channel;
+        u8  tx_power_att;
+
+        /* bit 0: DFS channel; bit 1: DFS enabled */
+        u8  flags;
+
+        u8  padding[3];
+} __packed;
+
+struct wl1271_cmd_sched_scan_config {
+        struct wl1271_cmd_header header;
+
+        __le32 intervals[SCAN_MAX_CYCLE_INTERVALS];
+
+        s8 rssi_threshold; /* for filtering (in dBm) */
+        s8 snr_threshold;  /* for filtering (in dB) */
+
+        u8 cycles;       /* maximum number of scan cycles */
+        u8 report_after; /* report when this number of results are received */
+        u8 terminate;    /* stop scanning after reporting */
+
+        u8 tag;
+        u8 bss_type; /* for filtering */
+        u8 filter_type;
+
+        u8 ssid_len;     /* For SCAN_SSID_FILTER_SPECIFIC */
+        u8 ssid[IW_ESSID_MAX_SIZE];
+
+        u8 n_probe_reqs; /* Number of probes requests per channel */
+
+        u8 passive[SCAN_MAX_BANDS];
+        u8 active[SCAN_MAX_BANDS];
+
+        u8 dfs;
+
+        u8 padding[3];
+
+        struct conn_scan_ch_params channels[MAX_CHANNELS_ALL_BANDS];
+} __packed;
+
+
+#define SCHED_SCAN_MAX_SSIDS 8
+
+enum {
+        SCAN_SSID_TYPE_PUBLIC = 0,
+        SCAN_SSID_TYPE_HIDDEN = 1,
+};
+
+struct wl1271_ssid {
+        u8 type;
+        u8 len;
+        u8 ssid[IW_ESSID_MAX_SIZE];
+        /* u8 padding[2]; */
+} __packed;
+
+struct wl1271_cmd_sched_scan_ssid_list {
+        struct wl1271_cmd_header header;
+
+        u8 n_ssids;
+        struct wl1271_ssid ssids[SCHED_SCAN_MAX_SSIDS];
+        u8 padding[3];
+} __packed;
+
+struct wl1271_cmd_sched_scan_start {
+        struct wl1271_cmd_header header;
+
+        u8 tag;
+        u8 padding[3];
+} __packed;
+
+struct wl1271_cmd_sched_scan_stop {
+        struct wl1271_cmd_header header;
+
+        u8 tag;
+        u8 padding[3];
+} __packed;
+
+
 #endif /* __WL1271_SCAN_H__ */