diff options
Diffstat (limited to 'drivers/net/wireless/zd1211rw/zd_ieee80211.c')
| -rw-r--r-- | drivers/net/wireless/zd1211rw/zd_ieee80211.c | 196 |
1 files changed, 53 insertions, 143 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_ieee80211.c b/drivers/net/wireless/zd1211rw/zd_ieee80211.c index 189160e..7c277ec 100644 --- a/drivers/net/wireless/zd1211rw/zd_ieee80211.c +++ b/drivers/net/wireless/zd1211rw/zd_ieee80211.c @@ -1,4 +1,7 @@ -/* zd_ieee80211.c +/* ZD1211 USB-WLAN driver for Linux + * + * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de> + * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -16,178 +19,85 @@ */ /* - * A lot of this code is generic and should be moved into the upper layers - * at some point. + * In the long term, we'll probably find a better way of handling regulatory + * requirements outside of the driver. */ -#include <linux/errno.h> -#include <linux/wireless.h> #include <linux/kernel.h> -#include <net/ieee80211.h> +#include <net/mac80211.h> -#include "zd_def.h" #include "zd_ieee80211.h" #include "zd_mac.h" +struct channel_range { + u8 regdomain; + u8 start; + u8 end; /* exclusive (channel must be less than end) */ +}; + static const struct channel_range channel_ranges[] = { - [0] = { 0, 0}, - [ZD_REGDOMAIN_FCC] = { 1, 12}, - [ZD_REGDOMAIN_IC] = { 1, 12}, - [ZD_REGDOMAIN_ETSI] = { 1, 14}, - [ZD_REGDOMAIN_JAPAN] = { 1, 14}, - [ZD_REGDOMAIN_SPAIN] = { 1, 14}, - [ZD_REGDOMAIN_FRANCE] = { 1, 14}, + { ZD_REGDOMAIN_FCC, 1, 12 }, + { ZD_REGDOMAIN_IC, 1, 12 }, + { ZD_REGDOMAIN_ETSI, 1, 14 }, + { ZD_REGDOMAIN_JAPAN, 1, 14 }, + { ZD_REGDOMAIN_SPAIN, 1, 14 }, + { ZD_REGDOMAIN_FRANCE, 1, 14 }, /* Japan originally only had channel 14 available (see CHNL_ID 0x40 in * 802.11). However, in 2001 the range was extended to include channels * 1-13. The ZyDAS devices still use the old region code but are * designed to allow the extra channel access in Japan. */ - [ZD_REGDOMAIN_JAPAN_ADD] = { 1, 15}, + { ZD_REGDOMAIN_JAPAN_ADD, 1, 15 }, }; -const struct channel_range *zd_channel_range(u8 regdomain) -{ - if (regdomain >= ARRAY_SIZE(channel_ranges)) - regdomain = 0; - return &channel_ranges[regdomain]; -} - -int zd_regdomain_supports_channel(u8 regdomain, u8 channel) -{ - const struct channel_range *range = zd_channel_range(regdomain); - return range->start <= channel && channel < range->end; -} - -int zd_regdomain_supported(u8 regdomain) -{ - const struct channel_range *range = zd_channel_range(regdomain); - return range->start != 0; -} - -/* Stores channel frequencies in MHz. */ -static const u16 channel_frequencies[] = { - 2412, 2417, 2422, 2427, 2432, 2437, 2442, 2447, - 2452, 2457, 2462, 2467, 2472, 2484, -}; - -#define NUM_CHANNELS ARRAY_SIZE(channel_frequencies) - -static int compute_freq(struct iw_freq *freq, u32 mhz, u32 hz) -{ - u32 factor; - - freq->e = 0; - if (mhz >= 1000000000U) { - pr_debug("zd1211 mhz %u to large\n", mhz); - freq->m = 0; - return -EINVAL; - } - - factor = 1000; - while (mhz >= factor) { - - freq->e += 1; - factor *= 10; - } - - factor /= 1000U; - freq->m = mhz * (1000000U/factor) + hz/factor; - - return 0; -} - -int zd_channel_to_freq(struct iw_freq *freq, u8 channel) +static const struct channel_range *zd_channel_range(u8 regdomain) { - if (channel > NUM_CHANNELS) { - freq->m = 0; - freq->e = 0; - return -EINVAL; - } - if (!channel) { - freq->m = 0; - freq->e = 0; - return -EINVAL; + int i; + for (i = 0; i < ARRAY_SIZE(channel_ranges); i++) { + const struct channel_range *range = &channel_ranges[i]; + if (range->regdomain == regdomain) + return range; } - return compute_freq(freq, channel_frequencies[channel-1], 0); + return NULL; } -static int freq_to_mhz(const struct iw_freq *freq) -{ - u32 factor; - int e; - - /* Such high frequencies are not supported. */ - if (freq->e > 6) - return -EINVAL; - - factor = 1; - for (e = freq->e; e > 0; --e) { - factor *= 10; - } - factor = 1000000U / factor; - - if (freq->m % factor) { - return -EINVAL; - } - - return freq->m / factor; -} +#define CHAN_TO_IDX(chan) ((chan) - 1) -int zd_find_channel(u8 *channel, const struct iw_freq *freq) +static void unmask_bg_channels(struct ieee80211_hw *hw, + const struct channel_range *range, + struct ieee80211_hw_mode *mode) { - int i, r; - u32 mhz; - - if (freq->m < 1000) { - if (freq->m > NUM_CHANNELS || freq->m == 0) - return -EINVAL; - *channel = freq->m; - return 1; - } - - r = freq_to_mhz(freq); - if (r < 0) - return r; - mhz = r; + u8 channel; - for (i = 0; i < NUM_CHANNELS; i++) { - if (mhz == channel_frequencies[i]) { - *channel = i+1; - return 1; - } + for (channel = range->start; channel < range->end; channel++) { + struct ieee80211_channel *chan = + &mode->channels[CHAN_TO_IDX(channel)]; + chan->flag |= IEEE80211_CHAN_W_SCAN | + IEEE80211_CHAN_W_ACTIVE_SCAN | + IEEE80211_CHAN_W_IBSS; } - - return -EINVAL; } -int zd_geo_init(struct ieee80211_device *ieee, u8 regdomain) +void zd_geo_init(struct ieee80211_hw *hw, u8 regdomain) { - struct ieee80211_geo geo; + struct zd_mac *mac = zd_hw_mac(hw); const struct channel_range *range; - int i; - u8 channel; - dev_dbg(zd_mac_dev(zd_netdev_mac(ieee->dev)), - "regdomain %#04x\n", regdomain); + dev_dbg(zd_mac_dev(mac), "regdomain %#02x\n", regdomain); range = zd_channel_range(regdomain); - if (range->start == 0) { - dev_err(zd_mac_dev(zd_netdev_mac(ieee->dev)), - "zd1211 regdomain %#04x not supported\n", - regdomain); - return -EINVAL; + if (!range) { + /* The vendor driver overrides the regulatory domain and + * allowed channel registers and unconditionally restricts + * available channels to 1-11 everywhere. Match their + * questionable behaviour only for regdomains which we don't + * recognise. */ + dev_warn(zd_mac_dev(mac), "Unrecognised regulatory domain: " + "%#02x. Defaulting to FCC.\n", regdomain); + range = zd_channel_range(ZD_REGDOMAIN_FCC); } - memset(&geo, 0, sizeof(geo)); - - for (i = 0, channel = range->start; channel < range->end; channel++) { - struct ieee80211_channel *chan = &geo.bg[i++]; - chan->freq = channel_frequencies[channel - 1]; - chan->channel = channel; - } - - geo.bg_channels = i; - memcpy(geo.name, "XX ", 4); - ieee80211_set_geo(ieee, &geo); - return 0; + unmask_bg_channels(hw, range, &mac->modes[0]); + unmask_bg_channels(hw, range, &mac->modes[1]); } + |
