diff options
Diffstat (limited to 'package/kernel/mac80211/patches/347-0002-cfg80211-support-ieee80211-freq-limit-DT-property.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/347-0002-cfg80211-support-ieee80211-freq-limit-DT-property.patch | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/package/kernel/mac80211/patches/347-0002-cfg80211-support-ieee80211-freq-limit-DT-property.patch b/package/kernel/mac80211/patches/347-0002-cfg80211-support-ieee80211-freq-limit-DT-property.patch deleted file mode 100644 index 3e1aae72db..0000000000 --- a/package/kernel/mac80211/patches/347-0002-cfg80211-support-ieee80211-freq-limit-DT-property.patch +++ /dev/null @@ -1,211 +0,0 @@ -From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> -Date: Wed, 4 Jan 2017 18:58:31 +0100 -Subject: [PATCH] cfg80211: support ieee80211-freq-limit DT property -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -This patch adds a helper for reading that new property and applying -limitations of supported channels specified this way. -It is used with devices that normally support a wide wireless band but -in a given config are limited to some part of it (usually due to board -design). For example a dual-band chipset may be able to support one band -only because of used antennas. -It's also common that tri-band routers have separated radios for lower -and higher part of 5 GHz band and it may be impossible to say which is -which without a DT info. - -Signed-off-by: Rafał Miłecki <rafal@milecki.pl> -[add new function to documentation, fix link] -Signed-off-by: Johannes Berg <johannes.berg@intel.com> ---- - create mode 100644 net/wireless/of.c - ---- a/include/net/cfg80211.h -+++ b/include/net/cfg80211.h -@@ -311,6 +311,34 @@ struct ieee80211_supported_band { - struct ieee80211_sta_vht_cap vht_cap; - }; - -+/** -+ * wiphy_read_of_freq_limits - read frequency limits from device tree -+ * -+ * @wiphy: the wireless device to get extra limits for -+ * -+ * Some devices may have extra limitations specified in DT. This may be useful -+ * for chipsets that normally support more bands but are limited due to board -+ * design (e.g. by antennas or external power amplifier). -+ * -+ * This function reads info from DT and uses it to *modify* channels (disable -+ * unavailable ones). It's usually a *bad* idea to use it in drivers with -+ * shared channel data as DT limitations are device specific. You should make -+ * sure to call it only if channels in wiphy are copied and can be modified -+ * without affecting other devices. -+ * -+ * As this function access device node it has to be called after set_wiphy_dev. -+ * It also modifies channels so they have to be set first. -+ * If using this helper, call it before wiphy_register(). -+ */ -+#ifdef CONFIG_OF -+void wiphy_read_of_freq_limits(struct wiphy *wiphy); -+#else /* CONFIG_OF */ -+static inline void wiphy_read_of_freq_limits(struct wiphy *wiphy) -+{ -+} -+#endif /* !CONFIG_OF */ -+ -+ - /* - * Wireless hardware/device configuration structures and methods - */ ---- a/net/wireless/Makefile -+++ b/net/wireless/Makefile -@@ -11,6 +11,7 @@ obj-$(CONFIG_WEXT_PRIV) += wext-priv.o - - cfg80211-y += core.o sysfs.o radiotap.o util.o reg.o scan.o nl80211.o - cfg80211-y += mlme.o ibss.o sme.o chan.o ethtool.o mesh.o ap.o trace.o ocb.o -+cfg80211-$(CONFIG_OF) += of.o - cfg80211-$(CPTCFG_CFG80211_DEBUGFS) += debugfs.o - cfg80211-$(CPTCFG_CFG80211_WEXT) += wext-compat.o wext-sme.o - cfg80211-$(CPTCFG_CFG80211_INTERNAL_REGDB) += regdb.o ---- /dev/null -+++ b/net/wireless/of.c -@@ -0,0 +1,138 @@ -+/* -+ * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl> -+ * -+ * Permission to use, copy, modify, and/or distribute this software for any -+ * purpose with or without fee is hereby granted, provided that the above -+ * copyright notice and this permission notice appear in all copies. -+ * -+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES -+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF -+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR -+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES -+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN -+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF -+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -+ */ -+ -+#include <linux/of.h> -+#include <net/cfg80211.h> -+#include "core.h" -+ -+static bool wiphy_freq_limits_valid_chan(struct wiphy *wiphy, -+ struct ieee80211_freq_range *freq_limits, -+ unsigned int n_freq_limits, -+ struct ieee80211_channel *chan) -+{ -+ u32 bw = MHZ_TO_KHZ(20); -+ int i; -+ -+ for (i = 0; i < n_freq_limits; i++) { -+ struct ieee80211_freq_range *limit = &freq_limits[i]; -+ -+ if (cfg80211_does_bw_fit_range(limit, -+ MHZ_TO_KHZ(chan->center_freq), -+ bw)) -+ return true; -+ } -+ -+ return false; -+} -+ -+static void wiphy_freq_limits_apply(struct wiphy *wiphy, -+ struct ieee80211_freq_range *freq_limits, -+ unsigned int n_freq_limits) -+{ -+ enum nl80211_band band; -+ int i; -+ -+ if (WARN_ON(!n_freq_limits)) -+ return; -+ -+ for (band = 0; band < NUM_NL80211_BANDS; band++) { -+ struct ieee80211_supported_band *sband = wiphy->bands[band]; -+ -+ if (!sband) -+ continue; -+ -+ for (i = 0; i < sband->n_channels; i++) { -+ struct ieee80211_channel *chan = &sband->channels[i]; -+ -+ if (chan->flags & IEEE80211_CHAN_DISABLED) -+ continue; -+ -+ if (!wiphy_freq_limits_valid_chan(wiphy, freq_limits, -+ n_freq_limits, -+ chan)) { -+ pr_debug("Disabling freq %d MHz as it's out of OF limits\n", -+ chan->center_freq); -+ chan->flags |= IEEE80211_CHAN_DISABLED; -+ } -+ } -+ } -+} -+ -+void wiphy_read_of_freq_limits(struct wiphy *wiphy) -+{ -+ struct device *dev = wiphy_dev(wiphy); -+ struct device_node *np; -+ struct property *prop; -+ struct ieee80211_freq_range *freq_limits; -+ unsigned int n_freq_limits; -+ const __be32 *p; -+ int len, i; -+ int err = 0; -+ -+ if (!dev) -+ return; -+ np = dev_of_node(dev); -+ if (!np) -+ return; -+ -+ prop = of_find_property(np, "ieee80211-freq-limit", &len); -+ if (!prop) -+ return; -+ -+ if (!len || len % sizeof(u32) || len / sizeof(u32) % 2) { -+ dev_err(dev, "ieee80211-freq-limit wrong format"); -+ return; -+ } -+ n_freq_limits = len / sizeof(u32) / 2; -+ -+ freq_limits = kcalloc(n_freq_limits, sizeof(*freq_limits), GFP_KERNEL); -+ if (!freq_limits) { -+ err = -ENOMEM; -+ goto out_kfree; -+ } -+ -+ p = NULL; -+ for (i = 0; i < n_freq_limits; i++) { -+ struct ieee80211_freq_range *limit = &freq_limits[i]; -+ -+ p = of_prop_next_u32(prop, p, &limit->start_freq_khz); -+ if (!p) { -+ err = -EINVAL; -+ goto out_kfree; -+ } -+ -+ p = of_prop_next_u32(prop, p, &limit->end_freq_khz); -+ if (!p) { -+ err = -EINVAL; -+ goto out_kfree; -+ } -+ -+ if (!limit->start_freq_khz || -+ !limit->end_freq_khz || -+ limit->start_freq_khz >= limit->end_freq_khz) { -+ err = -EINVAL; -+ goto out_kfree; -+ } -+ } -+ -+ wiphy_freq_limits_apply(wiphy, freq_limits, n_freq_limits); -+ -+out_kfree: -+ kfree(freq_limits); -+ if (err) -+ dev_err(dev, "Failed to get limits: %d\n", err); -+} -+EXPORT_SYMBOL(wiphy_read_of_freq_limits); |