proc: use seq_puts()/seq_putc() where possible

[linux-2.6/next.git] / drivers / net / wireless / iwlwifi / iwl-agn-eeprom.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>

#include <net/mac80211.h>

#include "iwl-commands.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-debug.h"
#include "iwl-agn.h"
#include "iwl-io.h"

/******************************************************************************
 *
 * EEPROM related functions
 *
******************************************************************************/

/*
 * The device's EEPROM semaphore prevents conflicts between driver and uCode
 * when accessing the EEPROM; each access is a series of pulses to/from the
 * EEPROM chip, not a single event, so even reads could conflict if they
 * weren't arbitrated by the semaphore.
 */
int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
{
        u16 count;
        int ret;

        for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
                /* Request semaphore */
                iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                            CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

                /* See if we got it */
                ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
                                CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
                                CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
                                EEPROM_SEM_TIMEOUT);
                if (ret >= 0) {
                        IWL_DEBUG_IO(priv,
                                "Acquired semaphore after %d tries.\n",
                                count+1);
                        return ret;
                }
        }

        return ret;
}

void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
{
        iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
                CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

}

int iwl_eeprom_check_version(struct iwl_priv *priv)
{
        u16 eeprom_ver;
        u16 calib_ver;

        eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
        calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);

        if (eeprom_ver < priv->cfg->eeprom_ver ||
            calib_ver < priv->cfg->eeprom_calib_ver)
                goto err;

        IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
                 eeprom_ver, calib_ver);

        return 0;
err:
        IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
                  "CALIB=0x%x < 0x%x\n",
                  eeprom_ver, priv->cfg->eeprom_ver,
                  calib_ver,  priv->cfg->eeprom_calib_ver);
        return -EINVAL;

}

int iwl_eeprom_check_sku(struct iwl_priv *priv)
{
        u16 eeprom_sku;
        u16 radio_cfg;

        eeprom_sku = iwl_eeprom_query16(priv, EEPROM_SKU_CAP);

        priv->cfg->sku = ((eeprom_sku & EEPROM_SKU_CAP_BAND_SELECTION) >>
                        EEPROM_SKU_CAP_BAND_POS);
        if (eeprom_sku & EEPROM_SKU_CAP_11N_ENABLE)
                priv->cfg->sku |= IWL_SKU_N;

        if (!priv->cfg->sku) {
                IWL_ERR(priv, "Invalid device sku\n");
                return -EINVAL;
        }

        IWL_INFO(priv, "Device SKU: 0X%x\n", priv->cfg->sku);

        if (!priv->cfg->valid_tx_ant && !priv->cfg->valid_rx_ant) {
                /* not using .cfg overwrite */
                radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);
                priv->cfg->valid_tx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
                priv->cfg->valid_rx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
                if (!priv->cfg->valid_tx_ant || !priv->cfg->valid_rx_ant) {
                        IWL_ERR(priv, "Invalid chain (0X%x, 0X%x)\n",
                                priv->cfg->valid_tx_ant,
                                priv->cfg->valid_rx_ant);
                        return -EINVAL;
                }
                IWL_INFO(priv, "Valid Tx ant: 0X%x, Valid Rx ant: 0X%x\n",
                         priv->cfg->valid_tx_ant, priv->cfg->valid_rx_ant);
        }
        /*
         * for some special cases,
         * EEPROM did not reflect the correct antenna setting
         * so overwrite the valid tx/rx antenna from .cfg
         */
        return 0;
}

void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
{
        const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
                                        EEPROM_MAC_ADDRESS);
        memcpy(mac, addr, ETH_ALEN);
}

/**
 * iwl_get_max_txpower_avg - get the highest tx power from all chains.
 *     find the highest tx power from all chains for the channel
 */
static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
                struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
                int element, s8 *max_txpower_in_half_dbm)
{
        s8 max_txpower_avg = 0; /* (dBm) */

        /* Take the highest tx power from any valid chains */
        if ((priv->cfg->valid_tx_ant & ANT_A) &&
            (enhanced_txpower[element].chain_a_max > max_txpower_avg))
                max_txpower_avg = enhanced_txpower[element].chain_a_max;
        if ((priv->cfg->valid_tx_ant & ANT_B) &&
            (enhanced_txpower[element].chain_b_max > max_txpower_avg))
                max_txpower_avg = enhanced_txpower[element].chain_b_max;
        if ((priv->cfg->valid_tx_ant & ANT_C) &&
            (enhanced_txpower[element].chain_c_max > max_txpower_avg))
                max_txpower_avg = enhanced_txpower[element].chain_c_max;
        if (((priv->cfg->valid_tx_ant == ANT_AB) |
            (priv->cfg->valid_tx_ant == ANT_BC) |
            (priv->cfg->valid_tx_ant == ANT_AC)) &&
            (enhanced_txpower[element].mimo2_max > max_txpower_avg))
                max_txpower_avg =  enhanced_txpower[element].mimo2_max;
        if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
            (enhanced_txpower[element].mimo3_max > max_txpower_avg))
                max_txpower_avg = enhanced_txpower[element].mimo3_max;

        /*
         * max. tx power in EEPROM is in 1/2 dBm format
         * convert from 1/2 dBm to dBm (round-up convert)
         * but we also do not want to loss 1/2 dBm resolution which
         * will impact performance
         */
        *max_txpower_in_half_dbm = max_txpower_avg;
        return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
}

static void
iwlcore_eeprom_enh_txp_read_element(struct iwl_priv *priv,
                                    struct iwl_eeprom_enhanced_txpwr *txp,
                                    s8 max_txpower_avg)
{
        int ch_idx;
        bool is_ht40 = txp->flags & IWL_EEPROM_ENH_TXP_FL_40MHZ;
        enum ieee80211_band band;

        band = txp->flags & IWL_EEPROM_ENH_TXP_FL_BAND_52G ?
                IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;

        for (ch_idx = 0; ch_idx < priv->channel_count; ch_idx++) {
                struct iwl_channel_info *ch_info = &priv->channel_info[ch_idx];

                /* update matching channel or from common data only */
                if (txp->channel != 0 && ch_info->channel != txp->channel)
                        continue;

                /* update matching band only */
                if (band != ch_info->band)
                        continue;

                if (ch_info->max_power_avg < max_txpower_avg && !is_ht40) {
                        ch_info->max_power_avg = max_txpower_avg;
                        ch_info->curr_txpow = max_txpower_avg;
                        ch_info->scan_power = max_txpower_avg;
                }

                if (is_ht40 && ch_info->ht40_max_power_avg < max_txpower_avg)
                        ch_info->ht40_max_power_avg = max_txpower_avg;
        }
}

#define EEPROM_TXP_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT)
#define EEPROM_TXP_ENTRY_LEN sizeof(struct iwl_eeprom_enhanced_txpwr)
#define EEPROM_TXP_SZ_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT_SIZE)

#define TXP_CHECK_AND_PRINT(x) ((txp->flags & IWL_EEPROM_ENH_TXP_FL_##x) \
                            ? # x " " : "")

void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
{
        struct iwl_eeprom_enhanced_txpwr *txp_array, *txp;
        int idx, entries;
        __le16 *txp_len;
        s8 max_txp_avg, max_txp_avg_halfdbm;

        BUILD_BUG_ON(sizeof(struct iwl_eeprom_enhanced_txpwr) != 8);

        /* the length is in 16-bit words, but we want entries */
        txp_len = (__le16 *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_SZ_OFFS);
        entries = le16_to_cpup(txp_len) * 2 / EEPROM_TXP_ENTRY_LEN;

        txp_array = (void *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_OFFS);

        for (idx = 0; idx < entries; idx++) {
                txp = &txp_array[idx];
                /* skip invalid entries */
                if (!(txp->flags & IWL_EEPROM_ENH_TXP_FL_VALID))
                        continue;

                IWL_DEBUG_EEPROM(priv, "%s %d:\t %s%s%s%s%s%s%s%s (0x%02x)\n",
                                 (txp->channel && (txp->flags &
                                        IWL_EEPROM_ENH_TXP_FL_COMMON_TYPE)) ?
                                        "Common " : (txp->channel) ?
                                        "Channel" : "Common",
                                 (txp->channel),
                                 TXP_CHECK_AND_PRINT(VALID),
                                 TXP_CHECK_AND_PRINT(BAND_52G),
                                 TXP_CHECK_AND_PRINT(OFDM),
                                 TXP_CHECK_AND_PRINT(40MHZ),
                                 TXP_CHECK_AND_PRINT(HT_AP),
                                 TXP_CHECK_AND_PRINT(RES1),
                                 TXP_CHECK_AND_PRINT(RES2),
                                 TXP_CHECK_AND_PRINT(COMMON_TYPE),
                                 txp->flags);
                IWL_DEBUG_EEPROM(priv, "\t\t chain_A: 0x%02x "
                                 "chain_B: 0X%02x chain_C: 0X%02x\n",
                                 txp->chain_a_max, txp->chain_b_max,
                                 txp->chain_c_max);
                IWL_DEBUG_EEPROM(priv, "\t\t MIMO2: 0x%02x "
                                 "MIMO3: 0x%02x High 20_on_40: 0x%02x "
                                 "Low 20_on_40: 0x%02x\n",
                                 txp->mimo2_max, txp->mimo3_max,
                                 ((txp->delta_20_in_40 & 0xf0) >> 4),
                                 (txp->delta_20_in_40 & 0x0f));

                max_txp_avg = iwl_get_max_txpower_avg(priv, txp_array, idx,
                                                      &max_txp_avg_halfdbm);

                /*
                 * Update the user limit values values to the highest
                 * power supported by any channel
                 */
                if (max_txp_avg > priv->tx_power_user_lmt)
                        priv->tx_power_user_lmt = max_txp_avg;
                if (max_txp_avg_halfdbm > priv->tx_power_lmt_in_half_dbm)
                        priv->tx_power_lmt_in_half_dbm = max_txp_avg_halfdbm;

                iwlcore_eeprom_enh_txp_read_element(priv, txp, max_txp_avg);
        }
}