1 /******************************************************************************
2 *
3 * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
4 *
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 *
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 *****************************************************************************/
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/pci.h>
34 #include <linux/delay.h>
35 #include <linux/skbuff.h>
36 #include <linux/netdevice.h>
37 #include <linux/wireless.h>
38
39 #include <net/mac80211.h>
40
41 #include "iwl-eeprom.h"
42 #include "iwl-dev.h"
43 #include "iwl-core.h"
44 #include "iwl-io.h"
45 #include "iwl-spectrum.h"
46
47 #define BEACON_TIME_MASK_LOW 0x00FFFFFF
48 #define BEACON_TIME_MASK_HIGH 0xFF000000
49 #define TIME_UNIT 1024
50
51 /*
52 * extended beacon time format
53 * time in usec will be changed into a 32-bit value in 8:24 format
54 * the high 1 byte is the beacon counts
55 * the lower 3 bytes is the time in usec within one beacon interval
56 */
57
58 /* TOOD: was used in sysfs debug interface need to add to mac */
59 #if 0
60 static u32 iwl_usecs_to_beacons(u32 usec, u32 beacon_interval)
61 {
62 u32 quot;
63 u32 rem;
64 u32 interval = beacon_interval * 1024;
65
66 if (!interval || !usec)
67 return 0;
68
69 quot = (usec / interval) & (BEACON_TIME_MASK_HIGH >> 24);
70 rem = (usec % interval) & BEACON_TIME_MASK_LOW;
71
72 return (quot << 24) + rem;
73 }
74
75 /* base is usually what we get from ucode with each received frame,
76 * the same as HW timer counter counting down
77 */
78
79 static __le32 iwl_add_beacon_time(u32 base, u32 addon, u32 beacon_interval)
80 {
81 u32 base_low = base & BEACON_TIME_MASK_LOW;
82 u32 addon_low = addon & BEACON_TIME_MASK_LOW;
83 u32 interval = beacon_interval * TIME_UNIT;
84 u32 res = (base & BEACON_TIME_MASK_HIGH) +
85 (addon & BEACON_TIME_MASK_HIGH);
86
87 if (base_low > addon_low)
88 res += base_low - addon_low;
89 else if (base_low < addon_low) {
90 res += interval + base_low - addon_low;
91 res += (1 << 24);
92 } else
93 res += (1 << 24);
94
95 return cpu_to_le32(res);
96 }
97 static int iwl_get_measurement(struct iwl_priv *priv,
98 struct ieee80211_measurement_params *params,
99 u8 type)
100 {
101 struct iwl4965_spectrum_cmd spectrum;
102 struct iwl_rx_packet *res;
103 struct iwl_host_cmd cmd = {
104 .id = REPLY_SPECTRUM_MEASUREMENT_CMD,
105 .data = (void *)&spectrum,
106 .meta.flags = CMD_WANT_SKB,
107 };
108 u32 add_time = le64_to_cpu(params->start_time);
109 int rc;
110 int spectrum_resp_status;
111 int duration = le16_to_cpu(params->duration);
112
113 if (iwl_is_associated(priv))
114 add_time =
115 iwl_usecs_to_beacons(
116 le64_to_cpu(params->start_time) - priv->last_tsf,
117 le16_to_cpu(priv->rxon_timing.beacon_interval));
118
119 memset(&spectrum, 0, sizeof(spectrum));
120
121 spectrum.channel_count = cpu_to_le16(1);
122 spectrum.flags =
123 RXON_FLG_TSF2HOST_MSK | RXON_FLG_ANT_A_MSK | RXON_FLG_DIS_DIV_MSK;
124 spectrum.filter_flags = MEASUREMENT_FILTER_FLAG;
125 cmd.len = sizeof(spectrum);
126 spectrum.len = cpu_to_le16(cmd.len - sizeof(spectrum.len));
127
128 if (iwl_is_associated(priv))
129 spectrum.start_time =
130 iwl_add_beacon_time(priv->last_beacon_time,
131 add_time,
132 le16_to_cpu(priv->rxon_timing.beacon_interval));
133 else
134 spectrum.start_time = 0;
135
136 spectrum.channels[0].duration = cpu_to_le32(duration * TIME_UNIT);
137 spectrum.channels[0].channel = params->channel;
138 spectrum.channels[0].type = type;
139 if (priv->active_rxon.flags & RXON_FLG_BAND_24G_MSK)
140 spectrum.flags |= RXON_FLG_BAND_24G_MSK |
141 RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK;
142
143 rc = iwl_send_cmd_sync(priv, &cmd);
144 if (rc)
145 return rc;
146
147 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
148 if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
149 IWL_ERR(priv, "Bad return from REPLY_RX_ON_ASSOC command\n");
150 rc = -EIO;
151 }
152
153 spectrum_resp_status = le16_to_cpu(res->u.spectrum.status);
154 switch (spectrum_resp_status) {
155 case 0: /* Command will be handled */
156 if (res->u.spectrum.id != 0xff) {
157 IWL_DEBUG_INFO(priv,
158 "Replaced existing measurement: %d\n",
159 res->u.spectrum.id);
160 priv->measurement_status &= ~MEASUREMENT_READY;
161 }
162 priv->measurement_status |= MEASUREMENT_ACTIVE;
163 rc = 0;
164 break;
165
166 case 1: /* Command will not be handled */
167 rc = -EAGAIN;
168 break;
169 }
170
171 dev_kfree_skb_any(cmd.meta.u.skb);
172
173 return rc;
174 }
175 #endif
176
177 static void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
178 struct iwl_rx_mem_buffer *rxb)
179 {
180 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
181 struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
182
183 if (!report->state) {
184 IWL_DEBUG_11H(priv,
185 "Spectrum Measure Notification: Start\n");
186 return;
187 }
188
189 memcpy(&priv->measure_report, report, sizeof(*report));
190 priv->measurement_status |= MEASUREMENT_READY;
191 }
192
193 void iwl_setup_spectrum_handlers(struct iwl_priv *priv)
194 {
195 priv->rx_handlers[SPECTRUM_MEASURE_NOTIFICATION] =
196 iwl_rx_spectrum_measure_notif;
197 }
198 EXPORT_SYMBOL(iwl_setup_spectrum_handlers);
199
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