path: root/drivers/net/wireless/zydas/zd1211rw/zd_mac.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>
 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
 * Copyright (C) 2007-2008 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/jiffies.h>
#include <net/ieee80211_radiotap.h>

#include "zd_def.h"
#include "zd_chip.h"
#include "zd_mac.h"
#include "zd_rf.h"

struct zd_reg_alpha2_map {
	u32 reg;
	char alpha2[2];
};

static struct zd_reg_alpha2_map reg_alpha2_map[] = {
	{ ZD_REGDOMAIN_FCC, "US" },
	{ ZD_REGDOMAIN_IC, "CA" },
	{ ZD_REGDOMAIN_ETSI, "DE" }, /* Generic ETSI, use most restrictive */
	{ ZD_REGDOMAIN_JAPAN, "JP" },
	{ ZD_REGDOMAIN_JAPAN_2, "JP" },
	{ ZD_REGDOMAIN_JAPAN_3, "JP" },
	{ ZD_REGDOMAIN_SPAIN, "ES" },
	{ ZD_REGDOMAIN_FRANCE, "FR" },
};

/* This table contains the hardware specific values for the modulation rates. */
static const struct ieee80211_rate zd_rates[] = {
	{ .bitrate = 10,
	  .hw_value = ZD_CCK_RATE_1M, },
	{ .bitrate = 20,
	  .hw_value = ZD_CCK_RATE_2M,
	  .hw_value_short = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT,
	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 55,
	  .hw_value = ZD_CCK_RATE_5_5M,
	  .hw_value_short = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT,
	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 110,
	  .hw_value = ZD_CCK_RATE_11M,
	  .hw_value_short = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT,
	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 60,
	  .hw_value = ZD_OFDM_RATE_6M,
	  .flags = 0 },
	{ .bitrate = 90,
	  .hw_value = ZD_OFDM_RATE_9M,
	  .flags = 0 },
	{ .bitrate = 120,
	  .hw_value = ZD_OFDM_RATE_12M,
	  .flags = 0 },
	{ .bitrate = 180,
	  .hw_value = ZD_OFDM_RATE_18M,
	  .flags = 0 },
	{ .bitrate = 240,
	  .hw_value = ZD_OFDM_RATE_24M,
	  .flags = 0 },
	{ .bitrate = 360,
	  .hw_value = ZD_OFDM_RATE_36M,
	  .flags = 0 },
	{ .bitrate = 480,
	  .hw_value = ZD_OFDM_RATE_48M,
	  .flags = 0 },
	{ .bitrate = 540,
	  .hw_value = ZD_OFDM_RATE_54M,
	  .flags = 0 },
};

/*
 * Zydas retry rates table. Each line is listed in the same order as
 * in zd_rates[] and contains all the rate used when a packet is sent
 * starting with a given rates. Let's consider an example :
 *
 * "11 Mbits : 4, 3, 2, 1, 0" means :
 * - packet is sent using 4 different rates
 * - 1st rate is index 3 (ie 11 Mbits)
 * - 2nd rate is index 2 (ie 5.5 Mbits)
 * - 3rd rate is index 1 (ie 2 Mbits)
 * - 4th rate is index 0 (ie 1 Mbits)
 */

static const struct tx_retry_rate zd_retry_rates[] = {
	{ /*  1 Mbits */	1, { 0 }},
	{ /*  2 Mbits */	2, { 1,  0 }},
	{ /*  5.5 Mbits */	3, { 2,  1, 0 }},
	{ /* 11 Mbits */	4, { 3,  2, 1, 0 }},
	{ /*  6 Mbits */	5, { 4,  3, 2, 1, 0 }},
	{ /*  9 Mbits */	6, { 5,  4, 3, 2, 1, 0}},
	{ /* 12 Mbits */	5, { 6,  3, 2, 1, 0 }},
	{ /* 18 Mbits */	6, { 7,  6, 3, 2, 1, 0 }},
	{ /* 24 Mbits */	6, { 8,  6, 3, 2, 1, 0 }},
	{ /* 36 Mbits */	7, { 9,  8, 6, 3, 2, 1, 0 }},
	{ /* 48 Mbits */	8, {10,  9, 8, 6, 3, 2, 1, 0 }},
	{ /* 54 Mbits */	9, {11, 10, 9, 8, 6, 3, 2, 1, 0 }}
};

static const struct ieee80211_channel zd_channels[] = {
	{ .center_freq = 2412, .hw_value = 1 },
	{ .center_freq = 2417, .hw_value = 2 },
	{ .center_freq = 2422, .hw_value = 3 },
	{ .center_freq = 2427, .hw_value = 4 },
	{ .center_freq = 2432, .hw_value = 5 },
	{ .center_freq = 2437, .hw_value = 6 },
	{ .center_freq = 2442, .hw_value = 7 },
	{ .center_freq = 2447, .hw_value = 8 },
	{ .center_freq = 2452, .hw_value = 9 },
	{ .center_freq = 2457, .hw_value = 10 },
	{ .center_freq = 2462, .hw_value = 11 },
	{ .center_freq = 2467, .hw_value = 12 },
	{ .center_freq = 2472, .hw_value = 13 },
	{ .center_freq = 2484, .hw_value = 14 },
};

static void housekeeping_init(struct zd_mac *mac);
static void housekeeping_enable(struct zd_mac *mac);
static void housekeeping_disable(struct zd_mac *mac);
static void beacon_init(struct zd_mac *mac);
static void beacon_enable(struct zd_mac *mac);
static void beacon_disable(struct zd_mac *mac);
static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble);
static int zd_mac_config_beacon(struct ieee80211_hw *hw,
				struct sk_buff *beacon, bool in_intr);

static int zd_reg2alpha2(u8 regdomain, char *alpha2)
{
	unsigned int i;
	struct zd_reg_alpha2_map *reg_map;
	for (i = 0; i < ARRAY_SIZE(reg_alpha2_map); i++) {
		reg_map = &reg_alpha2_map[i];
		if (regdomain == reg_map->reg) {
			alpha2[0] = reg_map->alpha2[0];
			alpha2[1] = reg_map->alpha2[1];
			return 0;
		}
	}
	return 1;
}

static int zd_check_signal(struct ieee80211_hw *hw, int signal)
{
	struct zd_mac *mac = zd_hw_mac(hw);

	dev_dbg_f_cond(zd_mac_dev(mac), signal < 0 || signal > 100,
			"%s: signal value from device not in range 0..100, "
			"but %d.\n", __func__, signal);

	if (signal < 0)
		signal = 0;
	else if (signal > 100)
		signal = 100;

	return signal;
}

int zd_mac_preinit_hw(struct ieee80211_hw *hw)
{
	int r;
	u8 addr[ETH_ALEN];
	struct zd_mac *mac = zd_hw_mac(hw);

	r = zd_chip_read_mac_addr_fw(&mac->chip, addr);
	if (r)
		return r;

	SET_IEEE80211_PERM_ADDR(hw, addr);

	return 0;
}

int zd_mac_init_hw(struct ieee80211_hw *hw)
{
	int r;
	struct zd_mac *mac = zd_hw_mac(hw);
	struct zd_chip *chip = &