1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Wifi Band Exclusion Interface for WLAN
4 * Copyright (C) 2023 Advanced Micro Devices
5 *
6 */
7
8 #include <linux/acpi_amd_wbrf.h>
9 #include <linux/units.h>
10 #include <net/cfg80211.h>
11 #include "ieee80211_i.h"
12
13 void ieee80211_check_wbrf_support(struct ieee80211_local *local)
14 {
15 struct wiphy *wiphy = local->hw.wiphy;
16 struct device *dev;
17
18 if (!wiphy)
19 return;
20
21 dev = wiphy->dev.parent;
22 if (!dev)
23 return;
24
25 local->wbrf_supported = acpi_amd_wbrf_supported_producer(dev);
26 }
27
28 static void get_chan_freq_boundary(u32 center_freq, u32 bandwidth, u64 *start, u64 *end)
29 {
30 bandwidth *= KHZ_PER_MHZ;
31 center_freq *= KHZ_PER_MHZ;
32
33 *start = center_freq - bandwidth / 2;
34 *end = center_freq + bandwidth / 2;
35
36 /* Frequency in Hz is expected */
37 *start = *start * HZ_PER_KHZ;
38 *end = *end * HZ_PER_KHZ;
39 }
40
41 static void get_ranges_from_chandef(struct cfg80211_chan_def *chandef,
42 struct wbrf_ranges_in_out *ranges_in)
43 {
44 u64 start_freq1, end_freq1;
45 u64 start_freq2, end_freq2;
46 int bandwidth;
47
48 bandwidth = nl80211_chan_width_to_mhz(chandef->width);
49
50 get_chan_freq_boundary(chandef->center_freq1, bandwidth, &start_freq1, &end_freq1);
51
52 ranges_in->band_list[0].start = start_freq1;
53 ranges_in->band_list[0].end = end_freq1;
54 ranges_in->num_of_ranges = 1;
55
56 if (chandef->width == NL80211_CHAN_WIDTH_80P80) {
57 get_chan_freq_boundary(chandef->center_freq2, bandwidth, &start_freq2, &end_freq2);
58
59 ranges_in->band_list[1].start = start_freq2;
60 ranges_in->band_list[1].end = end_freq2;
61 ranges_in->num_of_ranges++;
62 }
63 }
64
65 void ieee80211_add_wbrf(struct ieee80211_local *local, struct cfg80211_chan_def *chandef)
66 {
67 struct wbrf_ranges_in_out ranges_in = {0};
68 struct device *dev;
69
70 if (!local->wbrf_supported)
71 return;
72
73 dev = local->hw.wiphy->dev.parent;
74
75 get_ranges_from_chandef(chandef, &ranges_in);
76
77 acpi_amd_wbrf_add_remove(dev, WBRF_RECORD_ADD, &ranges_in);
78 }
79
80 void ieee80211_remove_wbrf(struct ieee80211_local *local, struct cfg80211_chan_def *chandef)
81 {
82 struct wbrf_ranges_in_out ranges_in = {0};
83 struct device *dev;
84
85 if (!local->wbrf_supported)
86 return;
87
88 dev = local->hw.wiphy->dev.parent;
89
90 get_ranges_from_chandef(chandef, &ranges_in);
91
92 acpi_amd_wbrf_add_remove(dev, WBRF_RECORD_REMOVE, &ranges_in);
93 }
94
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.