| 1 | |
| 2 | |
| 3 | * Copyright (C) 2017 Rafał Miłecki <[email protected]>
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| 4 |
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| 5 |
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| 6 | #include <linux/of.h>
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| 7 | #include <net/cfg80211.h>
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| 8 | #include "core.h"
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| 9 |
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| 10 | static bool wiphy_freq_limits_valid_chan(struct wiphy *wiphy,
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| 11 | struct ieee80211_freq_range *freq_limits,
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| 12 | unsigned int n_freq_limits,
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| 13 | struct ieee80211_channel *chan)
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| 14 | {
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| 15 | u32 bw = MHZ_TO_KHZ(20);
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| 16 | int i;
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| 17 |
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| 18 | for (i = 0; i < n_freq_limits; i++) {
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| 19 | struct ieee80211_freq_range *limit = &freq_limits[i];
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| 20 |
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| 21 | if (cfg80211_does_bw_fit_range(limit,
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| 22 | MHZ_TO_KHZ(chan->center_freq),
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| 23 | bw))
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| 24 | return true;
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| 25 | }
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| 26 |
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| 27 | return false;
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| 28 | }
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| 29 |
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| 30 | static void wiphy_freq_limits_apply(struct wiphy *wiphy,
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| 31 | struct ieee80211_freq_range *freq_limits,
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| 32 | unsigned int n_freq_limits)
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| 33 | {
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| 34 | enum nl80211_band band;
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| 35 | int i;
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| 36 |
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| 37 | if (WARN_ON(!n_freq_limits))
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| 38 | return;
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| 39 |
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| 40 | for (band = 0; band < NUM_NL80211_BANDS; band++) {
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| 41 | struct ieee80211_supported_band *sband = wiphy->bands[band];
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| 42 |
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| 43 | if (!sband)
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| 44 | continue;
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| 45 |
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| 46 | for (i = 0; i < sband->n_channels; i++) {
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| 47 | struct ieee80211_channel *chan = &sband->channels[i];
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| 48 |
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| 49 | if (chan->flags & IEEE80211_CHAN_DISABLED)
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| 50 | continue;
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| 51 |
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| 52 | if (!wiphy_freq_limits_valid_chan(wiphy, freq_limits,
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| 53 | n_freq_limits,
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| 54 | chan)) {
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| 55 | pr_debug("Disabling freq %d MHz as it's out of OF limits\n",
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| 56 | chan->center_freq);
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| 57 | chan->flags |= IEEE80211_CHAN_DISABLED;
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| 58 | }
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| 59 | }
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | void wiphy_read_of_freq_limits(struct wiphy *wiphy)
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| 64 | {
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| 65 | struct device *dev = wiphy_dev(wiphy);
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| 66 | struct device_node *np;
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| 67 | struct property *prop;
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| 68 | struct ieee80211_freq_range *freq_limits;
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| 69 | unsigned int n_freq_limits;
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| 70 | const __be32 *p;
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| 71 | int len, i;
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| 72 | int err = 0;
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| 73 |
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| 74 | if (!dev)
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| 75 | return;
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| 76 | np = dev_of_node(dev);
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| 77 | if (!np)
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| 78 | return;
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| 79 |
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| 80 | prop = of_find_property(np, "ieee80211-freq-limit", &len);
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| 81 | if (!prop)
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| 82 | return;
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| 83 |
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| 84 | if (!len || len % sizeof(u32) || len / sizeof(u32) % 2) {
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| 85 | dev_err(dev, "ieee80211-freq-limit wrong format");
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| 86 | return;
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| 87 | }
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| 88 | n_freq_limits = len / sizeof(u32) / 2;
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| 89 |
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| 90 | freq_limits = kzalloc_objs(*freq_limits, n_freq_limits);
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| 91 | if (!freq_limits) {
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| 92 | err = -ENOMEM;
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| 93 | goto out_kfree;
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| 94 | }
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| 95 |
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| 96 | p = NULL;
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| 97 | for (i = 0; i < n_freq_limits; i++) {
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| 98 | struct ieee80211_freq_range *limit = &freq_limits[i];
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| 99 |
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| 100 | p = of_prop_next_u32(prop, p, &limit->start_freq_khz);
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| 101 | if (!p) {
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| 102 | err = -EINVAL;
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| 103 | goto out_kfree;
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| 104 | }
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| 105 |
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| 106 | p = of_prop_next_u32(prop, p, &limit->end_freq_khz);
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| 107 | if (!p) {
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| 108 | err = -EINVAL;
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| 109 | goto out_kfree;
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| 110 | }
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| 111 |
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| 112 | if (!limit->start_freq_khz ||
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| 113 | !limit->end_freq_khz ||
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| 114 | limit->start_freq_khz >= limit->end_freq_khz) {
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| 115 | err = -EINVAL;
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| 116 | goto out_kfree;
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | wiphy_freq_limits_apply(wiphy, freq_limits, n_freq_limits);
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| 121 |
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| 122 | out_kfree:
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| 123 | kfree(freq_limits);
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| 124 | if (err)
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| 125 | dev_err(dev, "Failed to get limits: %d\n", err);
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| 126 | }
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| 127 | EXPORT_SYMBOL(wiphy_read_of_freq_limits);
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