diff options
Diffstat (limited to 'drivers/net/wireless/zd1211rw/zd_ieee80211.c')
| -rw-r--r-- | drivers/net/wireless/zd1211rw/zd_ieee80211.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_ieee80211.c b/drivers/net/wireless/zd1211rw/zd_ieee80211.c new file mode 100644 index 00000000000..66905f7b61f --- /dev/null +++ b/drivers/net/wireless/zd1211rw/zd_ieee80211.c @@ -0,0 +1,191 @@ +/* zd_ieee80211.c + * + * 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 + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* + * A lot of this code is generic and should be moved into the upper layers + * at some point. + */ + +#include <linux/errno.h> +#include <linux/wireless.h> +#include <linux/kernel.h> +#include <net/ieee80211.h> + +#include "zd_def.h" +#include "zd_ieee80211.h" +#include "zd_mac.h" + +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_JAPAN_ADD] = {14, 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) +{ + if (channel > NUM_CHANNELS) { + freq->m = 0; + freq->e = 0; + return -EINVAL; + } + if (!channel) { + freq->m = 0; + freq->e = 0; + return -EINVAL; + } + return compute_freq(freq, channel_frequencies[channel-1], 0); +} + +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; +} + +int zd_find_channel(u8 *channel, const struct iw_freq *freq) +{ + int i, r; + u32 mhz; + + if (!(freq->flags & IW_FREQ_FIXED)) + return 0; + + 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; + + for (i = 0; i < NUM_CHANNELS; i++) { + if (mhz == channel_frequencies[i]) { + *channel = i+1; + return 1; + } + } + + return -EINVAL; +} + +int zd_geo_init(struct ieee80211_device *ieee, u8 regdomain) +{ + struct ieee80211_geo geo; + const struct channel_range *range; + int i; + u8 channel; + + dev_dbg(zd_mac_dev(zd_netdev_mac(ieee->dev)), + "regdomain %#04x\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; + } + + 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; +} |