diff options
Diffstat (limited to 'drivers/net/wireless/intersil/orinoco/scan.c')
| -rw-r--r-- | drivers/net/wireless/intersil/orinoco/scan.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/drivers/net/wireless/intersil/orinoco/scan.c b/drivers/net/wireless/intersil/orinoco/scan.c new file mode 100644 index 0000000..6d1d084 --- /dev/null +++ b/drivers/net/wireless/intersil/orinoco/scan.c @@ -0,0 +1,259 @@ +/* Helpers for managing scan queues + * + * See copyright notice in main.c + */ + +#include <linux/gfp.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ieee80211.h> +#include <net/cfg80211.h> + +#include "hermes.h" +#include "orinoco.h" +#include "main.h" + +#include "scan.h" + +#define ZERO_DBM_OFFSET 0x95 +#define MAX_SIGNAL_LEVEL 0x8A +#define MIN_SIGNAL_LEVEL 0x2F + +#define SIGNAL_TO_DBM(x) \ + (clamp_t(s32, (x), MIN_SIGNAL_LEVEL, MAX_SIGNAL_LEVEL) \ + - ZERO_DBM_OFFSET) +#define SIGNAL_TO_MBM(x) (SIGNAL_TO_DBM(x) * 100) + +static int symbol_build_supp_rates(u8 *buf, const __le16 *rates) +{ + int i; + u8 rate; + + buf[0] = WLAN_EID_SUPP_RATES; + for (i = 0; i < 5; i++) { + rate = le16_to_cpu(rates[i]); + /* NULL terminated */ + if (rate == 0x0) + break; + buf[i + 2] = rate; + } + buf[1] = i; + + return i + 2; +} + +static int prism_build_supp_rates(u8 *buf, const u8 *rates) +{ + int i; + + buf[0] = WLAN_EID_SUPP_RATES; + for (i = 0; i < 8; i++) { + /* NULL terminated */ + if (rates[i] == 0x0) + break; + buf[i + 2] = rates[i]; + } + buf[1] = i; + + /* We might still have another 2 rates, which need to go in + * extended supported rates */ + if (i == 8 && rates[i] > 0) { + buf[10] = WLAN_EID_EXT_SUPP_RATES; + for (; i < 10; i++) { + /* NULL terminated */ + if (rates[i] == 0x0) + break; + buf[i + 2] = rates[i]; + } + buf[11] = i - 8; + } + + return (i < 8) ? i + 2 : i + 4; +} + +static void orinoco_add_hostscan_result(struct orinoco_private *priv, + const union hermes_scan_info *bss) +{ + struct wiphy *wiphy = priv_to_wiphy(priv); + struct ieee80211_channel *channel; + struct cfg80211_bss *cbss; + u8 *ie; + u8 ie_buf[46]; + u64 timestamp; + s32 signal; + u16 capability; + u16 beacon_interval; + int ie_len; + int freq; + int len; + + len = le16_to_cpu(bss->a.essid_len); + + /* Reconstruct SSID and bitrate IEs to pass up */ + ie_buf[0] = WLAN_EID_SSID; + ie_buf[1] = len; + memcpy(&ie_buf[2], bss->a.essid, len); + + ie = ie_buf + len + 2; + ie_len = ie_buf[1] + 2; + switch (priv->firmware_type) { + case FIRMWARE_TYPE_SYMBOL: + ie_len += symbol_build_supp_rates(ie, bss->s.rates); + break; + + case FIRMWARE_TYPE_INTERSIL: + ie_len += prism_build_supp_rates(ie, bss->p.rates); + break; + + case FIRMWARE_TYPE_AGERE: + default: + break; + } + + freq = ieee80211_channel_to_frequency( + le16_to_cpu(bss->a.channel), NL80211_BAND_2GHZ); + channel = ieee80211_get_channel(wiphy, freq); + if (!channel) { + printk(KERN_DEBUG "Invalid channel designation %04X(%04X)", + bss->a.channel, freq); + return; /* Then ignore it for now */ + } + timestamp = 0; + capability = le16_to_cpu(bss->a.capabilities); + beacon_interval = le16_to_cpu(bss->a.beacon_interv); + signal = SIGNAL_TO_MBM(le16_to_cpu(bss->a.level)); + + cbss = cfg80211_inform_bss(wiphy, channel, CFG80211_BSS_FTYPE_UNKNOWN, + bss->a.bssid, timestamp, capability, + beacon_interval, ie_buf, ie_len, signal, + GFP_KERNEL); + cfg80211_put_bss(wiphy, cbss); +} + +void orinoco_add_extscan_result(struct orinoco_private *priv, + struct agere_ext_scan_info *bss, + size_t len) +{ + struct wiphy *wiphy = priv_to_wiphy(priv); + struct ieee80211_channel *channel; + struct cfg80211_bss *cbss; + const u8 *ie; + u64 timestamp; + s32 signal; + u16 capability; + u16 beacon_interval; + size_t ie_len; + int chan, freq; + + ie_len = len - sizeof(*bss); + ie = cfg80211_find_ie(WLAN_EID_DS_PARAMS, bss->data, ie_len); + chan = ie ? ie[2] : 0; + freq = ieee80211_channel_to_frequency(chan, NL80211_BAND_2GHZ); + channel = ieee80211_get_channel(wiphy, freq); + + timestamp = le64_to_cpu(bss->timestamp); + capability = le16_to_cpu(bss->capabilities); + beacon_interval = le16_to_cpu(bss->beacon_interval); + ie = bss->data; + signal = SIGNAL_TO_MBM(bss->level); + + cbss = cfg80211_inform_bss(wiphy, channel, CFG80211_BSS_FTYPE_UNKNOWN, + bss->bssid, timestamp, capability, + beacon_interval, ie, ie_len, signal, + GFP_KERNEL); + cfg80211_put_bss(wiphy, cbss); +} + +void orinoco_add_hostscan_results(struct orinoco_private *priv, + unsigned char *buf, + size_t len) +{ + int offset; /* In the scan data */ + size_t atom_len; + bool abort = false; + + switch (priv->firmware_type) { + case FIRMWARE_TYPE_AGERE: + atom_len = sizeof(struct agere_scan_apinfo); + offset = 0; + break; + + case FIRMWARE_TYPE_SYMBOL: + /* Lack of documentation necessitates this hack. + * Different firmwares have 68 or 76 byte long atoms. + * We try modulo first. If the length divides by both, + * we check what would be the channel in the second + * frame for a 68-byte atom. 76-byte atoms have 0 there. + * Valid channel cannot be 0. */ + if (len % 76) + atom_len = 68; + else if (len % 68) + atom_len = 76; + else if (len >= 1292 && buf[68] == 0) + atom_len = 76; + else + atom_len = 68; + offset = 0; + break; + + case FIRMWARE_TYPE_INTERSIL: + offset = 4; + if (priv->has_hostscan) { + atom_len = le16_to_cpup((__le16 *)buf); + /* Sanity check for atom_len */ + if (atom_len < sizeof(struct prism2_scan_apinfo)) { + printk(KERN_ERR "%s: Invalid atom_len in scan " + "data: %zu\n", priv->ndev->name, + atom_len); + abort = true; + goto scan_abort; + } + } else + atom_len = offsetof(struct prism2_scan_apinfo, atim); + break; + + default: + abort = true; + goto scan_abort; + } + + /* Check that we got an whole number of atoms */ + if ((len - offset) % atom_len) { + printk(KERN_ERR "%s: Unexpected scan data length %zu, " + "atom_len %zu, offset %d\n", priv->ndev->name, len, + atom_len, offset); + abort = true; + goto scan_abort; + } + + /* Process the entries one by one */ + for (; offset + atom_len <= len; offset += atom_len) { + union hermes_scan_info *atom; + + atom = (union hermes_scan_info *) (buf + offset); + + orinoco_add_hostscan_result(priv, atom); + } + + scan_abort: + if (priv->scan_request) { + struct cfg80211_scan_info info = { + .aborted = abort, + }; + + cfg80211_scan_done(priv->scan_request, &info); + priv->scan_request = NULL; + } +} + +void orinoco_scan_done(struct orinoco_private *priv, bool abort) +{ + if (priv->scan_request) { + struct cfg80211_scan_info info = { + .aborted = abort, + }; + + cfg80211_scan_done(priv->scan_request, &info); + priv->scan_request = NULL; + } +} |