Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / net / wireless / orinoco / scan.c
blob96e39edfec770c58363237e9fa2955d4f16e567e
1 /* Helpers for managing scan queues
3 * See copyright notice in main.c
4 */
6 #include <linux/gfp.h>
7 #include <linux/kernel.h>
8 #include <linux/string.h>
9 #include <linux/ieee80211.h>
10 #include <net/cfg80211.h>
12 #include "hermes.h"
13 #include "orinoco.h"
14 #include "main.h"
16 #include "scan.h"
18 #define ZERO_DBM_OFFSET 0x95
19 #define MAX_SIGNAL_LEVEL 0x8A
20 #define MIN_SIGNAL_LEVEL 0x2F
22 #define SIGNAL_TO_DBM(x) \
23 (clamp_t(s32, (x), MIN_SIGNAL_LEVEL, MAX_SIGNAL_LEVEL) \
24 - ZERO_DBM_OFFSET)
25 #define SIGNAL_TO_MBM(x) (SIGNAL_TO_DBM(x) * 100)
27 static int symbol_build_supp_rates(u8 *buf, const __le16 *rates)
29 int i;
30 u8 rate;
32 buf[0] = WLAN_EID_SUPP_RATES;
33 for (i = 0; i < 5; i++) {
34 rate = le16_to_cpu(rates[i]);
35 /* NULL terminated */
36 if (rate == 0x0)
37 break;
38 buf[i + 2] = rate;
40 buf[1] = i;
42 return i + 2;
45 static int prism_build_supp_rates(u8 *buf, const u8 *rates)
47 int i;
49 buf[0] = WLAN_EID_SUPP_RATES;
50 for (i = 0; i < 8; i++) {
51 /* NULL terminated */
52 if (rates[i] == 0x0)
53 break;
54 buf[i + 2] = rates[i];
56 buf[1] = i;
58 /* We might still have another 2 rates, which need to go in
59 * extended supported rates */
60 if (i == 8 && rates[i] > 0) {
61 buf[10] = WLAN_EID_EXT_SUPP_RATES;
62 for (; i < 10; i++) {
63 /* NULL terminated */
64 if (rates[i] == 0x0)
65 break;
66 buf[i + 2] = rates[i];
68 buf[11] = i - 8;
71 return (i < 8) ? i + 2 : i + 4;
74 static void orinoco_add_hostscan_result(struct orinoco_private *priv,
75 const union hermes_scan_info *bss)
77 struct wiphy *wiphy = priv_to_wiphy(priv);
78 struct ieee80211_channel *channel;
79 struct cfg80211_bss *cbss;
80 u8 *ie;
81 u8 ie_buf[46];
82 u64 timestamp;
83 s32 signal;
84 u16 capability;
85 u16 beacon_interval;
86 int ie_len;
87 int freq;
88 int len;
90 len = le16_to_cpu(bss->a.essid_len);
92 /* Reconstruct SSID and bitrate IEs to pass up */
93 ie_buf[0] = WLAN_EID_SSID;
94 ie_buf[1] = len;
95 memcpy(&ie_buf[2], bss->a.essid, len);
97 ie = ie_buf + len + 2;
98 ie_len = ie_buf[1] + 2;
99 switch (priv->firmware_type) {
100 case FIRMWARE_TYPE_SYMBOL:
101 ie_len += symbol_build_supp_rates(ie, bss->s.rates);
102 break;
104 case FIRMWARE_TYPE_INTERSIL:
105 ie_len += prism_build_supp_rates(ie, bss->p.rates);
106 break;
108 case FIRMWARE_TYPE_AGERE:
109 default:
110 break;
113 freq = ieee80211_dsss_chan_to_freq(le16_to_cpu(bss->a.channel));
114 channel = ieee80211_get_channel(wiphy, freq);
115 if (!channel) {
116 printk(KERN_DEBUG "Invalid channel designation %04X(%04X)",
117 bss->a.channel, freq);
118 return; /* Then ignore it for now */
120 timestamp = 0;
121 capability = le16_to_cpu(bss->a.capabilities);
122 beacon_interval = le16_to_cpu(bss->a.beacon_interv);
123 signal = SIGNAL_TO_MBM(le16_to_cpu(bss->a.level));
125 cbss = cfg80211_inform_bss(wiphy, channel, bss->a.bssid, timestamp,
126 capability, beacon_interval, ie_buf, ie_len,
127 signal, GFP_KERNEL);
128 cfg80211_put_bss(cbss);
131 void orinoco_add_extscan_result(struct orinoco_private *priv,
132 struct agere_ext_scan_info *bss,
133 size_t len)
135 struct wiphy *wiphy = priv_to_wiphy(priv);
136 struct ieee80211_channel *channel;
137 struct cfg80211_bss *cbss;
138 const u8 *ie;
139 u64 timestamp;
140 s32 signal;
141 u16 capability;
142 u16 beacon_interval;
143 size_t ie_len;
144 int chan, freq;
146 ie_len = len - sizeof(*bss);
147 ie = cfg80211_find_ie(WLAN_EID_DS_PARAMS, bss->data, ie_len);
148 chan = ie ? ie[2] : 0;
149 freq = ieee80211_dsss_chan_to_freq(chan);
150 channel = ieee80211_get_channel(wiphy, freq);
152 timestamp = le64_to_cpu(bss->timestamp);
153 capability = le16_to_cpu(bss->capabilities);
154 beacon_interval = le16_to_cpu(bss->beacon_interval);
155 ie = bss->data;
156 signal = SIGNAL_TO_MBM(bss->level);
158 cbss = cfg80211_inform_bss(wiphy, channel, bss->bssid, timestamp,
159 capability, beacon_interval, ie, ie_len,
160 signal, GFP_KERNEL);
161 cfg80211_put_bss(cbss);
164 void orinoco_add_hostscan_results(struct orinoco_private *priv,
165 unsigned char *buf,
166 size_t len)
168 int offset; /* In the scan data */
169 size_t atom_len;
170 bool abort = false;
172 switch (priv->firmware_type) {
173 case FIRMWARE_TYPE_AGERE:
174 atom_len = sizeof(struct agere_scan_apinfo);
175 offset = 0;
176 break;
178 case FIRMWARE_TYPE_SYMBOL:
179 /* Lack of documentation necessitates this hack.
180 * Different firmwares have 68 or 76 byte long atoms.
181 * We try modulo first. If the length divides by both,
182 * we check what would be the channel in the second
183 * frame for a 68-byte atom. 76-byte atoms have 0 there.
184 * Valid channel cannot be 0. */
185 if (len % 76)
186 atom_len = 68;
187 else if (len % 68)
188 atom_len = 76;
189 else if (len >= 1292 && buf[68] == 0)
190 atom_len = 76;
191 else
192 atom_len = 68;
193 offset = 0;
194 break;
196 case FIRMWARE_TYPE_INTERSIL:
197 offset = 4;
198 if (priv->has_hostscan) {
199 atom_len = le16_to_cpup((__le16 *)buf);
200 /* Sanity check for atom_len */
201 if (atom_len < sizeof(struct prism2_scan_apinfo)) {
202 printk(KERN_ERR "%s: Invalid atom_len in scan "
203 "data: %zu\n", priv->ndev->name,
204 atom_len);
205 abort = true;
206 goto scan_abort;
208 } else
209 atom_len = offsetof(struct prism2_scan_apinfo, atim);
210 break;
212 default:
213 abort = true;
214 goto scan_abort;
217 /* Check that we got an whole number of atoms */
218 if ((len - offset) % atom_len) {
219 printk(KERN_ERR "%s: Unexpected scan data length %zu, "
220 "atom_len %zu, offset %d\n", priv->ndev->name, len,
221 atom_len, offset);
222 abort = true;
223 goto scan_abort;
226 /* Process the entries one by one */
227 for (; offset + atom_len <= len; offset += atom_len) {
228 union hermes_scan_info *atom;
230 atom = (union hermes_scan_info *) (buf + offset);
232 orinoco_add_hostscan_result(priv, atom);
235 scan_abort:
236 if (priv->scan_request) {
237 cfg80211_scan_done(priv->scan_request, abort);
238 priv->scan_request = NULL;
242 void orinoco_scan_done(struct orinoco_private *priv, bool abort)
244 if (priv->scan_request) {
245 cfg80211_scan_done(priv->scan_request, abort);
246 priv->scan_request = NULL;