Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 1 | /* |
Gertjan van Wingerde | 9c9a0d1 | 2009-11-08 16:39:55 +0100 | [diff] [blame] | 2 | Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com> |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 3 | <http://rt2x00.serialmonkey.com> |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the |
| 17 | Free Software Foundation, Inc., |
| 18 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | Module: rt2x00lib |
| 23 | Abstract: rt2x00 generic link tuning routines. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/module.h> |
| 28 | |
| 29 | #include "rt2x00.h" |
| 30 | #include "rt2x00lib.h" |
| 31 | |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 32 | /* |
| 33 | * When we lack RSSI information return something less then -80 to |
| 34 | * tell the driver to tune the device to maximum sensitivity. |
| 35 | */ |
| 36 | #define DEFAULT_RSSI -128 |
| 37 | |
| 38 | /* |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 39 | * Helper struct and macro to work with moving/walking averages. |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 40 | * When adding a value to the average value the following calculation |
| 41 | * is needed: |
| 42 | * |
| 43 | * avg_rssi = ((avg_rssi * 7) + rssi) / 8; |
| 44 | * |
| 45 | * The advantage of this approach is that we only need 1 variable |
| 46 | * to store the average in (No need for a count and a total). |
| 47 | * But more importantly, normal average values will over time |
| 48 | * move less and less towards newly added values this results |
| 49 | * that with link tuning, the device can have a very good RSSI |
| 50 | * for a few minutes but when the device is moved away from the AP |
| 51 | * the average will not decrease fast enough to compensate. |
| 52 | * The walking average compensates this and will move towards |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 53 | * the new values correctly allowing a effective link tuning, |
| 54 | * the speed of the average moving towards other values depends |
| 55 | * on the value for the number of samples. The higher the number |
| 56 | * of samples, the slower the average will move. |
| 57 | * We use two variables to keep track of the average value to |
| 58 | * compensate for the rounding errors. This can be a significant |
| 59 | * error (>5dBm) if the factor is too low. |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 60 | */ |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 61 | #define AVG_SAMPLES 8 |
| 62 | #define AVG_FACTOR 1000 |
| 63 | #define MOVING_AVERAGE(__avg, __val) \ |
| 64 | ({ \ |
| 65 | struct avg_val __new; \ |
| 66 | __new.avg_weight = \ |
| 67 | (__avg).avg_weight ? \ |
| 68 | ((((__avg).avg_weight * ((AVG_SAMPLES) - 1)) + \ |
| 69 | ((__val) * (AVG_FACTOR))) / \ |
Mark Einon | 027e8fd | 2010-11-06 15:47:09 +0100 | [diff] [blame] | 70 | (AVG_SAMPLES)) : \ |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 71 | ((__val) * (AVG_FACTOR)); \ |
| 72 | __new.avg = __new.avg_weight / (AVG_FACTOR); \ |
| 73 | __new; \ |
| 74 | }) |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 75 | |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 76 | static int rt2x00link_antenna_get_link_rssi(struct rt2x00_dev *rt2x00dev) |
| 77 | { |
| 78 | struct link_ant *ant = &rt2x00dev->link.ant; |
| 79 | |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 80 | if (ant->rssi_ant.avg && rt2x00dev->link.qual.rx_success) |
| 81 | return ant->rssi_ant.avg; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 82 | return DEFAULT_RSSI; |
| 83 | } |
| 84 | |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 85 | static int rt2x00link_antenna_get_rssi_history(struct rt2x00_dev *rt2x00dev) |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 86 | { |
| 87 | struct link_ant *ant = &rt2x00dev->link.ant; |
| 88 | |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 89 | if (ant->rssi_history) |
| 90 | return ant->rssi_history; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 91 | return DEFAULT_RSSI; |
| 92 | } |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 93 | |
| 94 | static void rt2x00link_antenna_update_rssi_history(struct rt2x00_dev *rt2x00dev, |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 95 | int rssi) |
| 96 | { |
| 97 | struct link_ant *ant = &rt2x00dev->link.ant; |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 98 | ant->rssi_history = rssi; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 99 | } |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 100 | |
| 101 | static void rt2x00link_antenna_reset(struct rt2x00_dev *rt2x00dev) |
| 102 | { |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 103 | rt2x00dev->link.ant.rssi_ant.avg = 0; |
| 104 | rt2x00dev->link.ant.rssi_ant.avg_weight = 0; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | static void rt2x00lib_antenna_diversity_sample(struct rt2x00_dev *rt2x00dev) |
| 108 | { |
| 109 | struct link_ant *ant = &rt2x00dev->link.ant; |
| 110 | struct antenna_setup new_ant; |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 111 | int other_antenna; |
| 112 | |
| 113 | int sample_current = rt2x00link_antenna_get_link_rssi(rt2x00dev); |
| 114 | int sample_other = rt2x00link_antenna_get_rssi_history(rt2x00dev); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 115 | |
| 116 | memcpy(&new_ant, &ant->active, sizeof(new_ant)); |
| 117 | |
| 118 | /* |
| 119 | * We are done sampling. Now we should evaluate the results. |
| 120 | */ |
| 121 | ant->flags &= ~ANTENNA_MODE_SAMPLE; |
| 122 | |
| 123 | /* |
| 124 | * During the last period we have sampled the RSSI |
Luis Correia | 4951348 | 2009-07-17 21:39:19 +0200 | [diff] [blame] | 125 | * from both antennas. It now is time to determine |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 126 | * which antenna demonstrated the best performance. |
| 127 | * When we are already on the antenna with the best |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 128 | * performance, just create a good starting point |
| 129 | * for the history and we are done. |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 130 | */ |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 131 | if (sample_current >= sample_other) { |
| 132 | rt2x00link_antenna_update_rssi_history(rt2x00dev, |
| 133 | sample_current); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 134 | return; |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | other_antenna = (ant->active.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 138 | |
| 139 | if (ant->flags & ANTENNA_RX_DIVERSITY) |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 140 | new_ant.rx = other_antenna; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 141 | |
| 142 | if (ant->flags & ANTENNA_TX_DIVERSITY) |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 143 | new_ant.tx = other_antenna; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 144 | |
Lars Ericsson | eb87eaa | 2009-07-18 20:21:52 +0200 | [diff] [blame] | 145 | rt2x00lib_config_antenna(rt2x00dev, new_ant); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | static void rt2x00lib_antenna_diversity_eval(struct rt2x00_dev *rt2x00dev) |
| 149 | { |
| 150 | struct link_ant *ant = &rt2x00dev->link.ant; |
| 151 | struct antenna_setup new_ant; |
| 152 | int rssi_curr; |
| 153 | int rssi_old; |
| 154 | |
| 155 | memcpy(&new_ant, &ant->active, sizeof(new_ant)); |
| 156 | |
| 157 | /* |
| 158 | * Get current RSSI value along with the historical value, |
| 159 | * after that update the history with the current value. |
| 160 | */ |
| 161 | rssi_curr = rt2x00link_antenna_get_link_rssi(rt2x00dev); |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 162 | rssi_old = rt2x00link_antenna_get_rssi_history(rt2x00dev); |
| 163 | rt2x00link_antenna_update_rssi_history(rt2x00dev, rssi_curr); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 164 | |
| 165 | /* |
| 166 | * Legacy driver indicates that we should swap antenna's |
| 167 | * when the difference in RSSI is greater that 5. This |
| 168 | * also should be done when the RSSI was actually better |
| 169 | * then the previous sample. |
| 170 | * When the difference exceeds the threshold we should |
| 171 | * sample the rssi from the other antenna to make a valid |
| 172 | * comparison between the 2 antennas. |
| 173 | */ |
| 174 | if (abs(rssi_curr - rssi_old) < 5) |
| 175 | return; |
| 176 | |
| 177 | ant->flags |= ANTENNA_MODE_SAMPLE; |
| 178 | |
| 179 | if (ant->flags & ANTENNA_RX_DIVERSITY) |
| 180 | new_ant.rx = (new_ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A; |
| 181 | |
| 182 | if (ant->flags & ANTENNA_TX_DIVERSITY) |
| 183 | new_ant.tx = (new_ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A; |
| 184 | |
Lars Ericsson | eb87eaa | 2009-07-18 20:21:52 +0200 | [diff] [blame] | 185 | rt2x00lib_config_antenna(rt2x00dev, new_ant); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 186 | } |
| 187 | |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 188 | static bool rt2x00lib_antenna_diversity(struct rt2x00_dev *rt2x00dev) |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 189 | { |
| 190 | struct link_ant *ant = &rt2x00dev->link.ant; |
| 191 | |
| 192 | /* |
| 193 | * Determine if software diversity is enabled for |
| 194 | * either the TX or RX antenna (or both). |
| 195 | * Always perform this check since within the link |
| 196 | * tuner interval the configuration might have changed. |
| 197 | */ |
Lars Ericsson | 85f4d64 | 2010-09-08 20:55:36 +0200 | [diff] [blame] | 198 | ant->flags &= ~ANTENNA_RX_DIVERSITY; |
| 199 | ant->flags &= ~ANTENNA_TX_DIVERSITY; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 200 | |
| 201 | if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY) |
Lars Ericsson | 85f4d64 | 2010-09-08 20:55:36 +0200 | [diff] [blame] | 202 | ant->flags |= ANTENNA_RX_DIVERSITY; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 203 | if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY) |
Lars Ericsson | 85f4d64 | 2010-09-08 20:55:36 +0200 | [diff] [blame] | 204 | ant->flags |= ANTENNA_TX_DIVERSITY; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 205 | |
| 206 | if (!(ant->flags & ANTENNA_RX_DIVERSITY) && |
| 207 | !(ant->flags & ANTENNA_TX_DIVERSITY)) { |
| 208 | ant->flags = 0; |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 209 | return true; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | /* |
| 213 | * If we have only sampled the data over the last period |
| 214 | * we should now harvest the data. Otherwise just evaluate |
| 215 | * the data. The latter should only be performed once |
| 216 | * every 2 seconds. |
| 217 | */ |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 218 | if (ant->flags & ANTENNA_MODE_SAMPLE) { |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 219 | rt2x00lib_antenna_diversity_sample(rt2x00dev); |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 220 | return true; |
| 221 | } else if (rt2x00dev->link.count & 1) { |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 222 | rt2x00lib_antenna_diversity_eval(rt2x00dev); |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 223 | return true; |
| 224 | } |
| 225 | |
| 226 | return false; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | void rt2x00link_update_stats(struct rt2x00_dev *rt2x00dev, |
| 230 | struct sk_buff *skb, |
| 231 | struct rxdone_entry_desc *rxdesc) |
| 232 | { |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 233 | struct link *link = &rt2x00dev->link; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 234 | struct link_qual *qual = &rt2x00dev->link.qual; |
| 235 | struct link_ant *ant = &rt2x00dev->link.ant; |
| 236 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 237 | |
| 238 | /* |
Helmut Schaa | a23c220 | 2010-10-09 13:33:16 +0200 | [diff] [blame] | 239 | * No need to update the stats for !=STA interfaces |
| 240 | */ |
| 241 | if (!rt2x00dev->intf_sta_count) |
| 242 | return; |
| 243 | |
| 244 | /* |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 245 | * Frame was received successfully since non-succesfull |
| 246 | * frames would have been dropped by the hardware. |
| 247 | */ |
| 248 | qual->rx_success++; |
| 249 | |
| 250 | /* |
| 251 | * We are only interested in quality statistics from |
| 252 | * beacons which came from the BSS which we are |
| 253 | * associated with. |
| 254 | */ |
| 255 | if (!ieee80211_is_beacon(hdr->frame_control) || |
| 256 | !(rxdesc->dev_flags & RXDONE_MY_BSS)) |
| 257 | return; |
| 258 | |
| 259 | /* |
| 260 | * Update global RSSI |
| 261 | */ |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 262 | link->avg_rssi = MOVING_AVERAGE(link->avg_rssi, rxdesc->rssi); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 263 | |
| 264 | /* |
| 265 | * Update antenna RSSI |
| 266 | */ |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 267 | ant->rssi_ant = MOVING_AVERAGE(ant->rssi_ant, rxdesc->rssi); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 268 | } |
| 269 | |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 270 | void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev) |
| 271 | { |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 272 | struct link *link = &rt2x00dev->link; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 273 | |
| 274 | /* |
| 275 | * Link tuning should only be performed when |
Helmut Schaa | 8654b79 | 2010-06-29 21:47:37 +0200 | [diff] [blame] | 276 | * an active sta interface exists. AP interfaces |
| 277 | * don't need link tuning and monitor mode interfaces |
| 278 | * should never have to work with link tuners. |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 279 | */ |
Helmut Schaa | 8654b79 | 2010-06-29 21:47:37 +0200 | [diff] [blame] | 280 | if (!rt2x00dev->intf_sta_count) |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 281 | return; |
| 282 | |
Ivo van Doorn | d8147f9 | 2010-07-11 12:24:47 +0200 | [diff] [blame] | 283 | /** |
| 284 | * While scanning, link tuning is disabled. By default |
| 285 | * the most sensitive settings will be used to make sure |
| 286 | * that all beacons and probe responses will be recieved |
| 287 | * during the scan. |
| 288 | */ |
| 289 | if (test_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags)) |
| 290 | return; |
| 291 | |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 292 | rt2x00link_reset_tuner(rt2x00dev, false); |
| 293 | |
Sean Cross | 66f84d6 | 2009-11-05 20:22:03 +0100 | [diff] [blame] | 294 | if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) |
| 295 | ieee80211_queue_delayed_work(rt2x00dev->hw, |
| 296 | &link->work, LINK_TUNE_INTERVAL); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | void rt2x00link_stop_tuner(struct rt2x00_dev *rt2x00dev) |
| 300 | { |
| 301 | cancel_delayed_work_sync(&rt2x00dev->link.work); |
| 302 | } |
| 303 | |
| 304 | void rt2x00link_reset_tuner(struct rt2x00_dev *rt2x00dev, bool antenna) |
| 305 | { |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 306 | struct link_qual *qual = &rt2x00dev->link.qual; |
Ivo van Doorn | 223dcc2 | 2010-07-11 12:25:17 +0200 | [diff] [blame] | 307 | u8 vgc_level = qual->vgc_level_reg; |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 308 | |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 309 | if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) |
| 310 | return; |
| 311 | |
| 312 | /* |
| 313 | * Reset link information. |
| 314 | * Both the currently active vgc level as well as |
| 315 | * the link tuner counter should be reset. Resetting |
| 316 | * the counter is important for devices where the |
| 317 | * device should only perform link tuning during the |
| 318 | * first minute after being enabled. |
| 319 | */ |
| 320 | rt2x00dev->link.count = 0; |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 321 | memset(qual, 0, sizeof(*qual)); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 322 | |
| 323 | /* |
Ivo van Doorn | 223dcc2 | 2010-07-11 12:25:17 +0200 | [diff] [blame] | 324 | * Restore the VGC level as stored in the registers, |
| 325 | * the driver can use this to determine if the register |
| 326 | * must be updated during reset or not. |
| 327 | */ |
| 328 | qual->vgc_level_reg = vgc_level; |
| 329 | |
| 330 | /* |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 331 | * Reset the link tuner. |
| 332 | */ |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 333 | rt2x00dev->ops->lib->reset_tuner(rt2x00dev, qual); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 334 | |
| 335 | if (antenna) |
| 336 | rt2x00link_antenna_reset(rt2x00dev); |
| 337 | } |
| 338 | |
Ivo van Doorn | a57e2e8 | 2009-03-28 20:51:41 +0100 | [diff] [blame] | 339 | static void rt2x00link_reset_qual(struct rt2x00_dev *rt2x00dev) |
Ivo van Doorn | 64abd80 | 2009-03-01 17:42:00 +0100 | [diff] [blame] | 340 | { |
| 341 | struct link_qual *qual = &rt2x00dev->link.qual; |
| 342 | |
| 343 | qual->rx_success = 0; |
| 344 | qual->rx_failed = 0; |
| 345 | qual->tx_success = 0; |
| 346 | qual->tx_failed = 0; |
| 347 | } |
| 348 | |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 349 | static void rt2x00link_tuner(struct work_struct *work) |
| 350 | { |
| 351 | struct rt2x00_dev *rt2x00dev = |
| 352 | container_of(work, struct rt2x00_dev, link.work.work); |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 353 | struct link *link = &rt2x00dev->link; |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 354 | struct link_qual *qual = &rt2x00dev->link.qual; |
| 355 | |
| 356 | /* |
| 357 | * When the radio is shutting down we should |
| 358 | * immediately cease all link tuning. |
| 359 | */ |
Ivo van Doorn | d8147f9 | 2010-07-11 12:24:47 +0200 | [diff] [blame] | 360 | if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) || |
| 361 | test_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags)) |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 362 | return; |
| 363 | |
| 364 | /* |
| 365 | * Update statistics. |
| 366 | */ |
| 367 | rt2x00dev->ops->lib->link_stats(rt2x00dev, qual); |
| 368 | rt2x00dev->low_level_stats.dot11FCSErrorCount += qual->rx_failed; |
| 369 | |
| 370 | /* |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 371 | * Update quality RSSI for link tuning, |
| 372 | * when we have received some frames and we managed to |
| 373 | * collect the RSSI data we could use this. Otherwise we |
| 374 | * must fallback to the default RSSI value. |
| 375 | */ |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 376 | if (!link->avg_rssi.avg || !qual->rx_success) |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 377 | qual->rssi = DEFAULT_RSSI; |
| 378 | else |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 379 | qual->rssi = link->avg_rssi.avg; |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 380 | |
| 381 | /* |
Ivo van Doorn | 27df2a9 | 2010-07-11 12:24:22 +0200 | [diff] [blame] | 382 | * Check if link tuning is supported by the hardware, some hardware |
| 383 | * do not support link tuning at all, while other devices can disable |
| 384 | * the feature from the EEPROM. |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 385 | */ |
Ivo van Doorn | 27df2a9 | 2010-07-11 12:24:22 +0200 | [diff] [blame] | 386 | if (test_bit(DRIVER_SUPPORT_LINK_TUNING, &rt2x00dev->flags)) |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 387 | rt2x00dev->ops->lib->link_tuner(rt2x00dev, qual, link->count); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 388 | |
| 389 | /* |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 390 | * Send a signal to the led to update the led signal strength. |
| 391 | */ |
Lars Ericsson | 66679a6 | 2009-08-08 23:54:51 +0200 | [diff] [blame] | 392 | rt2x00leds_led_quality(rt2x00dev, qual->rssi); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 393 | |
| 394 | /* |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 395 | * Evaluate antenna setup, make this the last step when |
| 396 | * rt2x00lib_antenna_diversity made changes the quality |
| 397 | * statistics will be reset. |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 398 | */ |
Lars Ericsson | 193df18 | 2009-08-08 23:54:24 +0200 | [diff] [blame] | 399 | if (rt2x00lib_antenna_diversity(rt2x00dev)) |
| 400 | rt2x00link_reset_qual(rt2x00dev); |
Ivo van Doorn | 64abd80 | 2009-03-01 17:42:00 +0100 | [diff] [blame] | 401 | |
| 402 | /* |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 403 | * Increase tuner counter, and reschedule the next link tuner run. |
| 404 | */ |
Ivo van Doorn | 5352ff6 | 2008-12-20 10:54:54 +0100 | [diff] [blame] | 405 | link->count++; |
Sean Cross | 66f84d6 | 2009-11-05 20:22:03 +0100 | [diff] [blame] | 406 | |
| 407 | if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) |
| 408 | ieee80211_queue_delayed_work(rt2x00dev->hw, |
| 409 | &link->work, LINK_TUNE_INTERVAL); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 410 | } |
| 411 | |
Ivo van Doorn | c965c74 | 2010-07-11 12:25:46 +0200 | [diff] [blame] | 412 | void rt2x00link_start_watchdog(struct rt2x00_dev *rt2x00dev) |
| 413 | { |
| 414 | struct link *link = &rt2x00dev->link; |
| 415 | |
| 416 | if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) || |
| 417 | !test_bit(DRIVER_SUPPORT_WATCHDOG, &rt2x00dev->flags)) |
| 418 | return; |
| 419 | |
Ivo van Doorn | cdfd2c5c | 2010-10-11 15:37:47 +0200 | [diff] [blame] | 420 | schedule_delayed_work(&link->watchdog_work, WATCHDOG_INTERVAL); |
Ivo van Doorn | c965c74 | 2010-07-11 12:25:46 +0200 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | void rt2x00link_stop_watchdog(struct rt2x00_dev *rt2x00dev) |
| 424 | { |
| 425 | cancel_delayed_work_sync(&rt2x00dev->link.watchdog_work); |
| 426 | } |
| 427 | |
| 428 | static void rt2x00link_watchdog(struct work_struct *work) |
| 429 | { |
| 430 | struct rt2x00_dev *rt2x00dev = |
| 431 | container_of(work, struct rt2x00_dev, link.watchdog_work.work); |
| 432 | struct link *link = &rt2x00dev->link; |
| 433 | |
| 434 | /* |
| 435 | * When the radio is shutting down we should |
| 436 | * immediately cease the watchdog monitoring. |
| 437 | */ |
| 438 | if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) |
| 439 | return; |
| 440 | |
| 441 | rt2x00dev->ops->lib->watchdog(rt2x00dev); |
| 442 | |
| 443 | if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) |
Ivo van Doorn | cdfd2c5c | 2010-10-11 15:37:47 +0200 | [diff] [blame] | 444 | schedule_delayed_work(&link->watchdog_work, WATCHDOG_INTERVAL); |
Ivo van Doorn | c965c74 | 2010-07-11 12:25:46 +0200 | [diff] [blame] | 445 | } |
| 446 | |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 447 | void rt2x00link_register(struct rt2x00_dev *rt2x00dev) |
| 448 | { |
Ivo van Doorn | c965c74 | 2010-07-11 12:25:46 +0200 | [diff] [blame] | 449 | INIT_DELAYED_WORK(&rt2x00dev->link.watchdog_work, rt2x00link_watchdog); |
Ivo van Doorn | 84e3196 | 2008-12-20 10:53:29 +0100 | [diff] [blame] | 450 | INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00link_tuner); |
| 451 | } |