Merge tag 'pinctrl-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...

[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / iwlwifi / iwl-drv.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) 2007 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 *
 * 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 COPYING.
 *
 * 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 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * 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/completion.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/vmalloc.h>

#include "iwl-drv.h"
#include "iwl-csr.h"
#include "iwl-debug.h"
#include "iwl-trans.h"
#include "iwl-op-mode.h"
#include "iwl-agn-hw.h"
#include "iwl-fw.h"
#include "iwl-config.h"
#include "iwl-modparams.h"

/******************************************************************************
 *
 * module boiler plate
 *
 ******************************************************************************/

#define DRV_DESCRIPTION "Intel(R) Wireless WiFi driver for Linux"
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
MODULE_LICENSE("GPL");

#ifdef CONFIG_IWLWIFI_DEBUGFS
static struct dentry *iwl_dbgfs_root;
#endif

/**
 * struct iwl_drv - drv common data
 * @list: list of drv structures using this opmode
 * @fw: the iwl_fw structure
 * @op_mode: the running op_mode
 * @trans: transport layer
 * @dev: for debug prints only
 * @cfg: configuration struct
 * @fw_index: firmware revision to try loading
 * @firmware_name: composite filename of ucode file to load
 * @request_firmware_complete: the firmware has been obtained from user space
 */
struct iwl_drv {
        struct list_head list;
        struct iwl_fw fw;

        struct iwl_op_mode *op_mode;
        struct iwl_trans *trans;
        struct device *dev;
        const struct iwl_cfg *cfg;

        int fw_index;                   /* firmware we're trying to load */
        char firmware_name[32];         /* name of firmware file to load */

        struct completion request_firmware_complete;

#ifdef CONFIG_IWLWIFI_DEBUGFS
        struct dentry *dbgfs_drv;
        struct dentry *dbgfs_trans;
        struct dentry *dbgfs_op_mode;
#endif
};

enum {
        DVM_OP_MODE =   0,
        MVM_OP_MODE =   1,
};

/* Protects the table contents, i.e. the ops pointer & drv list */
static struct mutex iwlwifi_opmode_table_mtx;
static struct iwlwifi_opmode_table {
        const char *name;                       /* name: iwldvm, iwlmvm, etc */
        const struct iwl_op_mode_ops *ops;      /* pointer to op_mode ops */
        struct list_head drv;           /* list of devices using this op_mode */
} iwlwifi_opmode_table[] = {            /* ops set when driver is initialized */
        [DVM_OP_MODE] = { .name = "iwldvm", .ops = NULL },
        [MVM_OP_MODE] = { .name = "iwlmvm", .ops = NULL },
};

#define IWL_DEFAULT_SCAN_CHANNELS 40

/*
 * struct fw_sec: Just for the image parsing proccess.
 * For the fw storage we are using struct fw_desc.
 */
struct fw_sec {
        const void *data;               /* the sec data */
        size_t size;                    /* section size */
        u32 offset;                     /* offset of writing in the device */
};

static void iwl_free_fw_desc(struct iwl_drv *drv, struct fw_desc *desc)
{
        vfree(desc->data);
        desc->data = NULL;
        desc->len = 0;
}

static void iwl_free_fw_img(struct iwl_drv *drv, struct fw_img *img)
{
        int i;
        for (i = 0; i < IWL_UCODE_SECTION_MAX; i++)
                iwl_free_fw_desc(drv, &img->sec[i]);
}

static void iwl_dealloc_ucode(struct iwl_drv *drv)
{
        int i;

        kfree(drv->fw.dbg_dest_tlv);
        for (i = 0; i < ARRAY_SIZE(drv->fw.dbg_conf_tlv); i++)
                kfree(drv->fw.dbg_conf_tlv[i]);

        for (i = 0; i < IWL_UCODE_TYPE_MAX; i++)
                iwl_free_fw_img(drv, drv->fw.img + i);
}

static int iwl_alloc_fw_desc(struct iwl_drv *drv, struct fw_desc *desc,
                             struct fw_sec *sec)
{
        void *data;

        desc->data = NULL;

        if (!sec || !sec->size)
                return -EINVAL;

        data = vmalloc(sec->size);
        if (!data)
                return -ENOMEM;

        desc->len = sec->size;
        desc->offset = sec->offset;
        memcpy(data, sec->data, desc->len);
        desc->data = data;

        return 0;
}

static void iwl_req_fw_callback(const struct firmware *ucode_raw,
                                void *context);

#define UCODE_EXPERIMENTAL_INDEX        100
#define UCODE_EXPERIMENTAL_TAG          "exp"

static int iwl_request_firmware(struct iwl_drv *drv, bool first)
{
        const char *name_pre = drv->cfg->fw_name_pre;
        char tag[8];

        if (first) {
#ifdef CONFIG_IWLWIFI_DEBUG_EXPERIMENTAL_UCODE
                drv->fw_index = UCODE_EXPERIMENTAL_INDEX;
                strcpy(tag, UCODE_EXPERIMENTAL_TAG);
        } else if (drv->fw_index == UCODE_EXPERIMENTAL_INDEX) {
#endif
                drv->fw_index = drv->cfg->ucode_api_max;
                sprintf(tag, "%d", drv->fw_index);
        } else {
                drv->fw_index--;
                sprintf(tag, "%d", drv->fw_index);
        }

        if (drv->fw_index < drv->cfg->ucode_api_min) {
                IWL_ERR(drv, "no suitable firmware found!\n");
                return -ENOENT;
        }

        snprintf(drv->firmware_name, sizeof(drv->firmware_name), "%s%s.ucode",
                 name_pre, tag);

        /*
         * Starting 8000B - FW name format has changed. This overwrites the
         * previous name and uses the new format.
         */
        if (drv->trans->cfg->device_family == IWL_DEVICE_FAMILY_8000) {
                char rev_step[2] = {
                        'A' + CSR_HW_REV_STEP(drv->trans->hw_rev), 0
                };

                /* A-step doesn't have an indication */
                if (CSR_HW_REV_STEP(drv->trans->hw_rev) == SILICON_A_STEP)
                        rev_step[0] = 0;

                snprintf(drv->firmware_name, sizeof(drv->firmware_name),
                         "%s%s-%s.ucode", name_pre, rev_step, tag);
        }

        IWL_DEBUG_INFO(drv, "attempting to load firmware %s'%s'\n",
                       (drv->fw_index == UCODE_EXPERIMENTAL_INDEX)
                                ? "EXPERIMENTAL " : "",
                       drv->firmware_name);

        return request_firmware_nowait(THIS_MODULE, 1, drv->firmware_name,
                                       drv->trans->dev,
                                       GFP_KERNEL, drv, iwl_req_fw_callback);
}

struct fw_img_parsing {
        struct fw_sec sec[IWL_UCODE_SECTION_MAX];
        int sec_counter;
};

/*
 * struct fw_sec_parsing: to extract fw section and it's offset from tlv
 */
struct fw_sec_parsing {
        __le32 offset;
        const u8 data[];
} __packed;

/**
 * struct iwl_tlv_calib_data - parse the default calib data from TLV
 *
 * @ucode_type: the uCode to which the following default calib relates.
 * @calib: default calibrations.
 */
struct iwl_tlv_calib_data {
        __le32 ucode_type;
        struct iwl_tlv_calib_ctrl calib;
} __packed;

struct iwl_firmware_pieces {
        struct fw_img_parsing img[IWL_UCODE_TYPE_MAX];

        u32 init_evtlog_ptr, init_evtlog_size, init_errlog_ptr;
        u32 inst_evtlog_ptr, inst_evtlog_size, inst_errlog_ptr;

        /* FW debug data parsed for driver usage */
        struct iwl_fw_dbg_dest_tlv *dbg_dest_tlv;
        struct iwl_fw_dbg_conf_tlv *dbg_conf_tlv[FW_DBG_MAX];
        size_t dbg_conf_tlv_len[FW_DBG_MAX];
};

/*
 * These functions are just to extract uCode section data from the pieces
 * structure.
 */
static struct fw_sec *get_sec(struct iwl_firmware_pieces *pieces,
                              enum iwl_ucode_type type,
                              int  sec)
{
        return &pieces->img[type].sec[sec];
}

static void set_sec_data(struct iwl_firmware_pieces *pieces,
                         enum iwl_ucode_type type,
                         int sec,
                         const void *data)
{
        pieces->img[type].sec[sec].data = data;
}

static void set_sec_size(struct iwl_firmware_pieces *pieces,
                         enum iwl_ucode_type type,
                         int sec,
                         size_t size)
{
        pieces->img[type].sec[sec].size = size;
}

static size_t get_sec_size(struct iwl_firmware_pieces *pieces,
                           enum iwl_ucode_type type,
                           int sec)
{
        return pieces->img[type].sec[sec].size;
}

static void set_sec_offset(struct iwl_firmware_pieces *pieces,
                           enum iwl_ucode_type type,
                           int sec,
                           u32 offset)
{
        pieces->img[type].sec[sec].offset = offset;
}

static int iwl_store_cscheme(struct iwl_fw *fw, const u8 *data, const u32 len)
{
        int i, j;
        struct iwl_fw_cscheme_list *l = (struct iwl_fw_cscheme_list *)data;
        struct iwl_fw_cipher_scheme *fwcs;
        struct ieee80211_cipher_scheme *cs;
        u32 cipher;

        if (len < sizeof(*l) ||
            len < sizeof(l->size) + l->size * sizeof(l->cs[0]))
                return -EINVAL;

        for (i = 0, j = 0; i < IWL_UCODE_MAX_CS && i < l->size; i++) {
                fwcs = &l->cs[j];
                cipher = le32_to_cpu(fwcs->cipher);

                /* we skip schemes with zero cipher suite selector */
                if (!cipher)
                        continue;

                cs = &fw->cs[j++];
                cs->cipher = cipher;
                cs->iftype = BIT(NL80211_IFTYPE_STATION);
                cs->hdr_len = fwcs->hdr_len;
                cs->pn_len = fwcs->pn_len;
                cs->pn_off = fwcs->pn_off;
                cs->key_idx_off = fwcs->key_idx_off;
                cs->key_idx_mask = fwcs->key_idx_mask;
                cs->key_idx_shift = fwcs->key_idx_shift;
                cs->mic_len = fwcs->mic_len;
        }

        return 0;
}

/*
 * Gets uCode section from tlv.
 */
static int iwl_store_ucode_sec(struct iwl_firmware_pieces *pieces,
                               const void *data, enum iwl_ucode_type type,
                               int size)
{
        struct fw_img_parsing *img;
        struct fw_sec *sec;
        struct fw_sec_parsing *sec_parse;

        if (WARN_ON(!pieces || !data || type >= IWL_UCODE_TYPE_MAX))
                return -1;

        sec_parse = (struct fw_sec_parsing *)data;

        img = &pieces->img[type];
        sec = &img->sec[img->sec_counter];

        sec->offset = le32_to_cpu(sec_parse->offset);
        sec->data = sec_parse->data;
        sec->size = size - sizeof(sec_parse->offset);

        ++img->sec_counter;

        return 0;
}

static int iwl_set_default_calib(struct iwl_drv *drv, const u8 *data)
{
        struct iwl_tlv_calib_data *def_calib =
                                        (struct iwl_tlv_calib_data *)data;
        u32 ucode_type = le32_to_cpu(def_calib->ucode_type);
        if (ucode_type >= IWL_UCODE_TYPE_MAX) {
                IWL_ERR(drv, "Wrong ucode_type %u for default calibration.\n",
                        ucode_type);
                return -EINVAL;
        }
        drv->fw.default_calib[ucode_type].flow_trigger =
                def_calib->calib.flow_trigger;
        drv->fw.default_calib[ucode_type].event_trigger =
                def_calib->calib.event_trigger;

        return 0;
}

static int iwl_set_ucode_api_flags(struct iwl_drv *drv, const u8 *data,
                                   struct iwl_ucode_capabilities *capa)
{
        const struct iwl_ucode_api *ucode_api = (void *)data;
        u32 api_index = le32_to_cpu(ucode_api->api_index);

        if (api_index >= IWL_API_ARRAY_SIZE) {
                IWL_ERR(drv, "api_index larger than supported by driver\n");
                return -EINVAL;
        }

        capa->api[api_index] = le32_to_cpu(ucode_api->api_flags);

        return 0;
}

static int iwl_set_ucode_capabilities(struct iwl_drv *drv, const u8 *data,
                                      struct iwl_ucode_capabilities *capa)
{
        const struct iwl_ucode_capa *ucode_capa = (void *)data;
        u32 api_index = le32_to_cpu(ucode_capa->api_index);

        if (api_index >= IWL_CAPABILITIES_ARRAY_SIZE) {
                IWL_ERR(drv, "api_index larger than supported by driver\n");
                return -EINVAL;
        }

        capa->capa[api_index] = le32_to_cpu(ucode_capa->api_capa);

        return 0;
}

static int iwl_parse_v1_v2_firmware(struct iwl_drv *drv,
                                    const struct firmware *ucode_raw,
                                    struct iwl_firmware_pieces *pieces)
{
        struct iwl_ucode_header *ucode = (void *)ucode_raw->data;
        u32 api_ver, hdr_size, build;
        char buildstr[25];
        const u8 *src;

        drv->fw.ucode_ver = le32_to_cpu(ucode->ver);
        api_ver = IWL_UCODE_API(drv->fw.ucode_ver);

        switch (api_ver) {
        default:
                hdr_size = 28;
                if (ucode_raw->size < hdr_size) {
                        IWL_ERR(drv, "File size too small!\n");
                        return -EINVAL;
                }
                build = le32_to_cpu(ucode->u.v2.build);
                set_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST,
                             le32_to_cpu(ucode->u.v2.inst_size));
                set_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA,
                             le32_to_cpu(ucode->u.v2.data_size));
                set_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST,
                             le32_to_cpu(ucode->u.v2.init_size));
                set_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA,
                             le32_to_cpu(ucode->u.v2.init_data_size));
                src = ucode->u.v2.data;
                break;
        case 0:
        case 1:
        case 2:
                hdr_size = 24;
                if (ucode_raw->size < hdr_size) {
                        IWL_ERR(drv, "File size too small!\n");
                        return -EINVAL;
                }
                build = 0;
                set_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST,
                             le32_to_cpu(ucode->u.v1.inst_size));
                set_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA,
                             le32_to_cpu(ucode->u.v1.data_size));
                set_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST,
                             le32_to_cpu(ucode->u.v1.init_size));
                set_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA,
                             le32_to_cpu(ucode->u.v1.init_data_size));
                src = ucode->u.v1.data;
                break;
        }

        if (build)
                sprintf(buildstr, " build %u%s", build,
                       (drv->fw_index == UCODE_EXPERIMENTAL_INDEX)
                                ? " (EXP)" : "");
        else
                buildstr[0] = '\0';

        snprintf(drv->fw.fw_version,
                 sizeof(drv->fw.fw_version),
                 "%u.%u.%u.%u%s",
                 IWL_UCODE_MAJOR(drv->fw.ucode_ver),
                 IWL_UCODE_MINOR(drv->fw.ucode_ver),
                 IWL_UCODE_API(drv->fw.ucode_ver),
                 IWL_UCODE_SERIAL(drv->fw.ucode_ver),
                 buildstr);

        /* Verify size of file vs. image size info in file's header */

        if (ucode_raw->size != hdr_size +
            get_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST) +
            get_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA) +
            get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST) +
            get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA)) {

                IWL_ERR(drv,
                        "uCode file size %d does not match expected size\n",
                        (int)ucode_raw->size);
                return -EINVAL;
        }


        set_sec_data(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST, src);
        src += get_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST);
        set_sec_offset(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST,
                       IWLAGN_RTC_INST_LOWER_BOUND);
        set_sec_data(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA, src);
        src += get_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA);
        set_sec_offset(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA,
                       IWLAGN_RTC_DATA_LOWER_BOUND);
        set_sec_data(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST, src);
        src += get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST);
        set_sec_offset(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST,
                       IWLAGN_RTC_INST_LOWER_BOUND);
        set_sec_data(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA, src);
        src += get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA);
        set_sec_offset(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA,
                       IWLAGN_RTC_DATA_LOWER_BOUND);
        return 0;
}

static int iwl_parse_tlv_firmware(struct iwl_drv *drv,
                                const struct firmware *ucode_raw,
                                struct iwl_firmware_pieces *pieces,
                                struct iwl_ucode_capabilities *capa)
{
        struct iwl_tlv_ucode_header *ucode = (void *)ucode_raw->data;
        struct iwl_ucode_tlv *tlv;
        size_t len = ucode_raw->size;
        const u8 *data;
        u32 tlv_len;
        enum iwl_ucode_tlv_type tlv_type;
        const u8 *tlv_data;
        char buildstr[25];
        u32 build;
        int num_of_cpus;
        bool usniffer_images = false;
        bool usniffer_req = false;

        if (len < sizeof(*ucode)) {
                IWL_ERR(drv, "uCode has invalid length: %zd\n", len);
                return -EINVAL;
        }

        if (ucode->magic != cpu_to_le32(IWL_TLV_UCODE_MAGIC)) {
                IWL_ERR(drv, "invalid uCode magic: 0X%x\n",
                        le32_to_cpu(ucode->magic));
                return -EINVAL;
        }

        drv->fw.ucode_ver = le32_to_cpu(ucode->ver);
        memcpy(drv->fw.human_readable, ucode->human_readable,
               sizeof(drv->fw.human_readable));
        build = le32_to_cpu(ucode->build);

        if (build)
                sprintf(buildstr, " build %u%s", build,
                       (drv->fw_index == UCODE_EXPERIMENTAL_INDEX)
                                ? " (EXP)" : "");
        else
                buildstr[0] = '\0';

        snprintf(drv->fw.fw_version,
                 sizeof(drv->fw.fw_version),
                 "%u.%u.%u.%u%s",
                 IWL_UCODE_MAJOR(drv->fw.ucode_ver),
                 IWL_UCODE_MINOR(drv->fw.ucode_ver),
                 IWL_UCODE_API(drv->fw.ucode_ver),
                 IWL_UCODE_SERIAL(drv->fw.ucode_ver),
                 buildstr);

        data = ucode->data;

        len -= sizeof(*ucode);

        while (len >= sizeof(*tlv)) {
                len -= sizeof(*tlv);
                tlv = (void *)data;

                tlv_len = le32_to_cpu(tlv->length);
                tlv_type = le32_to_cpu(tlv->type);
                tlv_data = tlv->data;

                if (len < tlv_len) {
                        IWL_ERR(drv, "invalid TLV len: %zd/%u\n",
                                len, tlv_len);
                        return -EINVAL;
                }
                len -= ALIGN(tlv_len, 4);
                data += sizeof(*tlv) + ALIGN(tlv_len, 4);

                switch (tlv_type) {
                case IWL_UCODE_TLV_INST:
                        set_sec_data(pieces, IWL_UCODE_REGULAR,
                                     IWL_UCODE_SECTION_INST, tlv_data);
                        set_sec_size(pieces, IWL_UCODE_REGULAR,
                                     IWL_UCODE_SECTION_INST, tlv_len);
                        set_sec_offset(pieces, IWL_UCODE_REGULAR,
                                       IWL_UCODE_SECTION_INST,
                                       IWLAGN_RTC_INST_LOWER_BOUND);
                        break;
                case IWL_UCODE_TLV_DATA:
                        set_sec_data(pieces, IWL_UCODE_REGULAR,
                                     IWL_UCODE_SECTION_DATA, tlv_data);
                        set_sec_size(pieces, IWL_UCODE_REGULAR,
                                     IWL_UCODE_SECTION_DATA, tlv_len);
                        set_sec_offset(pieces, IWL_UCODE_REGULAR,
                                       IWL_UCODE_SECTION_DATA,
                                       IWLAGN_RTC_DATA_LOWER_BOUND);
                        break;
                case IWL_UCODE_TLV_INIT:
                        set_sec_data(pieces, IWL_UCODE_INIT,
                                     IWL_UCODE_SECTION_INST, tlv_data);
                        set_sec_size(pieces, IWL_UCODE_INIT,
                                     IWL_UCODE_SECTION_INST, tlv_len);
                        set_sec_offset(pieces, IWL_UCODE_INIT,
                                       IWL_UCODE_SECTION_INST,
                                       IWLAGN_RTC_INST_LOWER_BOUND);
                        break;
                case IWL_UCODE_TLV_INIT_DATA:
                        set_sec_data(pieces, IWL_UCODE_INIT,
                                     IWL_UCODE_SECTION_DATA, tlv_data);
                        set_sec_size(pieces, IWL_UCODE_INIT,
                                     IWL_UCODE_SECTION_DATA, tlv_len);
                        set_sec_offset(pieces, IWL_UCODE_INIT,
                                       IWL_UCODE_SECTION_DATA,
                                       IWLAGN_RTC_DATA_LOWER_BOUND);
                        break;
                case IWL_UCODE_TLV_BOOT:
                        IWL_ERR(drv, "Found unexpected BOOT ucode\n");
                        break;
                case IWL_UCODE_TLV_PROBE_MAX_LEN:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        capa->max_probe_length =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_PAN:
                        if (tlv_len)
                                goto invalid_tlv_len;
                        capa->flags |= IWL_UCODE_TLV_FLAGS_PAN;
                        break;
                case IWL_UCODE_TLV_FLAGS:
                        /* must be at least one u32 */
                        if (tlv_len < sizeof(u32))
                                goto invalid_tlv_len;
                        /* and a proper number of u32s */
                        if (tlv_len % sizeof(u32))
                                goto invalid_tlv_len;
                        /*
                         * This driver only reads the first u32 as
                         * right now no more features are defined,
                         * if that changes then either the driver
                         * will not work with the new firmware, or
                         * it'll not take advantage of new features.
                         */
                        capa->flags = le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_API_CHANGES_SET:
                        if (tlv_len != sizeof(struct iwl_ucode_api))
                                goto invalid_tlv_len;
                        if (iwl_set_ucode_api_flags(drv, tlv_data, capa))
                                goto tlv_error;
                        break;
                case IWL_UCODE_TLV_ENABLED_CAPABILITIES:
                        if (tlv_len != sizeof(struct iwl_ucode_capa))
                                goto invalid_tlv_len;
                        if (iwl_set_ucode_capabilities(drv, tlv_data, capa))
                                goto tlv_error;
                        break;
                case IWL_UCODE_TLV_INIT_EVTLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->init_evtlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_INIT_EVTLOG_SIZE:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->init_evtlog_size =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_INIT_ERRLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->init_errlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_RUNT_EVTLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->inst_evtlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_RUNT_EVTLOG_SIZE:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->inst_evtlog_size =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_RUNT_ERRLOG_PTR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        pieces->inst_errlog_ptr =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_ENHANCE_SENS_TBL:
                        if (tlv_len)
                                goto invalid_tlv_len;
                        drv->fw.enhance_sensitivity_table = true;
                        break;
                case IWL_UCODE_TLV_WOWLAN_INST:
                        set_sec_data(pieces, IWL_UCODE_WOWLAN,
                                     IWL_UCODE_SECTION_INST, tlv_data);
                        set_sec_size(pieces, IWL_UCODE_WOWLAN,
                                     IWL_UCODE_SECTION_INST, tlv_len);
                        set_sec_offset(pieces, IWL_UCODE_WOWLAN,
                                       IWL_UCODE_SECTION_INST,
                                       IWLAGN_RTC_INST_LOWER_BOUND);
                        break;
                case IWL_UCODE_TLV_WOWLAN_DATA:
                        set_sec_data(pieces, IWL_UCODE_WOWLAN,
                                     IWL_UCODE_SECTION_DATA, tlv_data);
                        set_sec_size(pieces, IWL_UCODE_WOWLAN,
                                     IWL_UCODE_SECTION_DATA, tlv_len);
                        set_sec_offset(pieces, IWL_UCODE_WOWLAN,
                                       IWL_UCODE_SECTION_DATA,
                                       IWLAGN_RTC_DATA_LOWER_BOUND);
                        break;
                case IWL_UCODE_TLV_PHY_CALIBRATION_SIZE:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        capa->standard_phy_calibration_size =
                                        le32_to_cpup((__le32 *)tlv_data);
                        break;
                 case IWL_UCODE_TLV_SEC_RT:
                        iwl_store_ucode_sec(pieces, tlv_data, IWL_UCODE_REGULAR,
                                            tlv_len);
                        drv->fw.mvm_fw = true;
                        break;
                case IWL_UCODE_TLV_SEC_INIT:
                        iwl_store_ucode_sec(pieces, tlv_data, IWL_UCODE_INIT,
                                            tlv_len);
                        drv->fw.mvm_fw = true;
                        break;
                case IWL_UCODE_TLV_SEC_WOWLAN:
                        iwl_store_ucode_sec(pieces, tlv_data, IWL_UCODE_WOWLAN,
                                            tlv_len);
                        drv->fw.mvm_fw = true;
                        break;
                case IWL_UCODE_TLV_DEF_CALIB:
                        if (tlv_len != sizeof(struct iwl_tlv_calib_data))
                                goto invalid_tlv_len;
                        if (iwl_set_default_calib(drv, tlv_data))
                                goto tlv_error;
                        break;
                case IWL_UCODE_TLV_PHY_SKU:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        drv->fw.phy_config = le32_to_cpup((__le32 *)tlv_data);
                        drv->fw.valid_tx_ant = (drv->fw.phy_config &
                                                FW_PHY_CFG_TX_CHAIN) >>
                                                FW_PHY_CFG_TX_CHAIN_POS;
                        drv->fw.valid_rx_ant = (drv->fw.phy_config &
                                                FW_PHY_CFG_RX_CHAIN) >>
                                                FW_PHY_CFG_RX_CHAIN_POS;
                        break;
                 case IWL_UCODE_TLV_SECURE_SEC_RT:
                        iwl_store_ucode_sec(pieces, tlv_data, IWL_UCODE_REGULAR,
                                            tlv_len);
                        drv->fw.mvm_fw = true;
                        break;
                case IWL_UCODE_TLV_SECURE_SEC_INIT:
                        iwl_store_ucode_sec(pieces, tlv_data, IWL_UCODE_INIT,
                                            tlv_len);
                        drv->fw.mvm_fw = true;
                        break;
                case IWL_UCODE_TLV_SECURE_SEC_WOWLAN:
                        iwl_store_ucode_sec(pieces, tlv_data, IWL_UCODE_WOWLAN,
                                            tlv_len);
                        drv->fw.mvm_fw = true;
                        break;
                case IWL_UCODE_TLV_NUM_OF_CPU:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        num_of_cpus =
                                le32_to_cpup((__le32 *)tlv_data);

                        if (num_of_cpus == 2) {
                                drv->fw.img[IWL_UCODE_REGULAR].is_dual_cpus =
                                        true;
                                drv->fw.img[IWL_UCODE_INIT].is_dual_cpus =
                                        true;
                                drv->fw.img[IWL_UCODE_WOWLAN].is_dual_cpus =
                                        true;
                        } else if ((num_of_cpus > 2) || (num_of_cpus < 1)) {
                                IWL_ERR(drv, "Driver support upto 2 CPUs\n");
                                return -EINVAL;
                        }
                        break;
                case IWL_UCODE_TLV_CSCHEME:
                        if (iwl_store_cscheme(&drv->fw, tlv_data, tlv_len))
                                goto invalid_tlv_len;
                        break;
                case IWL_UCODE_TLV_N_SCAN_CHANNELS:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        capa->n_scan_channels =
                                le32_to_cpup((__le32 *)tlv_data);
                        break;
                case IWL_UCODE_TLV_FW_DBG_DEST: {
                        struct iwl_fw_dbg_dest_tlv *dest = (void *)tlv_data;

                        if (pieces->dbg_dest_tlv) {
                                IWL_ERR(drv,
                                        "dbg destination ignored, already exists\n");
                                break;
                        }

                        pieces->dbg_dest_tlv = dest;
                        IWL_INFO(drv, "Found debug destination: %s\n",
                                 get_fw_dbg_mode_string(dest->monitor_mode));

                        drv->fw.dbg_dest_reg_num =
                                tlv_len - offsetof(struct iwl_fw_dbg_dest_tlv,
                                                   reg_ops);
                        drv->fw.dbg_dest_reg_num /=
                                sizeof(drv->fw.dbg_dest_tlv->reg_ops[0]);

                        break;
                        }
                case IWL_UCODE_TLV_FW_DBG_CONF: {
                        struct iwl_fw_dbg_conf_tlv *conf = (void *)tlv_data;

                        if (!pieces->dbg_dest_tlv) {
                                IWL_ERR(drv,
                                        "Ignore dbg config %d - no destination configured\n",
                                        conf->id);
                                break;
                        }

                        if (conf->id >= ARRAY_SIZE(drv->fw.dbg_conf_tlv)) {
                                IWL_ERR(drv,
                                        "Skip unknown configuration: %d\n",
                                        conf->id);
                                break;
                        }

                        if (pieces->dbg_conf_tlv[conf->id]) {
                                IWL_ERR(drv,
                                        "Ignore duplicate dbg config %d\n",
                                        conf->id);
                                break;
                        }

                        if (conf->usniffer)
                                usniffer_req = true;

                        IWL_INFO(drv, "Found debug configuration: %d\n",
                                 conf->id);

                        pieces->dbg_conf_tlv[conf->id] = conf;
                        pieces->dbg_conf_tlv_len[conf->id] = tlv_len;
                        break;
                        }
                case IWL_UCODE_TLV_SEC_RT_USNIFFER:
                        usniffer_images = true;
                        iwl_store_ucode_sec(pieces, tlv_data,
                                            IWL_UCODE_REGULAR_USNIFFER,
                                            tlv_len);
                        break;
                case IWL_UCODE_TLV_SDIO_ADMA_ADDR:
                        if (tlv_len != sizeof(u32))
                                goto invalid_tlv_len;
                        drv->fw.sdio_adma_addr =
                                le32_to_cpup((__le32 *)tlv_data);
                        break;
                default:
                        IWL_DEBUG_INFO(drv, "unknown TLV: %d\n", tlv_type);
                        break;
                }
        }

        if (usniffer_req && !usniffer_images) {
                IWL_ERR(drv,
                        "user selected to work with usniffer but usniffer image isn't available in ucode package\n");
                return -EINVAL;
        }

        if (len) {
                IWL_ERR(drv, "invalid TLV after parsing: %zd\n", len);
                iwl_print_hex_dump(drv, IWL_DL_FW, (u8 *)data, len);
                return -EINVAL;
        }

        return 0;

 invalid_tlv_len:
        IWL_ERR(drv, "TLV %d has invalid size: %u\n", tlv_type, tlv_len);
 tlv_error:
        iwl_print_hex_dump(drv, IWL_DL_FW, tlv_data, tlv_len);

        return -EINVAL;
}

static int iwl_alloc_ucode(struct iwl_drv *drv,
                           struct iwl_firmware_pieces *pieces,
                           enum iwl_ucode_type type)
{
        int i;
        for (i = 0;
             i < IWL_UCODE_SECTION_MAX && get_sec_size(pieces, type, i);
             i++)
                if (iwl_alloc_fw_desc(drv, &(drv->fw.img[type].sec[i]),
                                      get_sec(pieces, type, i)))
                        return -ENOMEM;
        return 0;
}

static int validate_sec_sizes(struct iwl_drv *drv,
                              struct iwl_firmware_pieces *pieces,
                              const struct iwl_cfg *cfg)
{
        IWL_DEBUG_INFO(drv, "f/w package hdr runtime inst size = %Zd\n",
                get_sec_size(pieces, IWL_UCODE_REGULAR,
                             IWL_UCODE_SECTION_INST));
        IWL_DEBUG_INFO(drv, "f/w package hdr runtime data size = %Zd\n",
                get_sec_size(pieces, IWL_UCODE_REGULAR,
                             IWL_UCODE_SECTION_DATA));
        IWL_DEBUG_INFO(drv, "f/w package hdr init inst size = %Zd\n",
                get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST));
        IWL_DEBUG_INFO(drv, "f/w package hdr init data size = %Zd\n",
                get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA));

        /* Verify that uCode images will fit in card's SRAM. */
        if (get_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_INST) >
                                                        cfg->max_inst_size) {
                IWL_ERR(drv, "uCode instr len %Zd too large to fit in\n",
                        get_sec_size(pieces, IWL_UCODE_REGULAR,
                                                IWL_UCODE_SECTION_INST));
                return -1;
        }

        if (get_sec_size(pieces, IWL_UCODE_REGULAR, IWL_UCODE_SECTION_DATA) >
                                                        cfg->max_data_size) {
                IWL_ERR(drv, "uCode data len %Zd too large to fit in\n",
                        get_sec_size(pieces, IWL_UCODE_REGULAR,
                                                IWL_UCODE_SECTION_DATA));
                return -1;
        }

         if (get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_INST) >
                                                        cfg->max_inst_size) {
                IWL_ERR(drv, "uCode init instr len %Zd too large to fit in\n",
                        get_sec_size(pieces, IWL_UCODE_INIT,
                                                IWL_UCODE_SECTION_INST));
                return -1;
        }

        if (get_sec_size(pieces, IWL_UCODE_INIT, IWL_UCODE_SECTION_DATA) >
                                                        cfg->max_data_size) {
                IWL_ERR(drv, "uCode init data len %Zd too large to fit in\n",
                        get_sec_size(pieces, IWL_UCODE_REGULAR,
                                                IWL_UCODE_SECTION_DATA));
                return -1;
        }
        return 0;
}

static struct iwl_op_mode *
_iwl_op_mode_start(struct iwl_drv *drv, struct iwlwifi_opmode_table *op)
{
        const struct iwl_op_mode_ops *ops = op->ops;
        struct dentry *dbgfs_dir = NULL;
        struct iwl_op_mode *op_mode = NULL;

#ifdef CONFIG_IWLWIFI_DEBUGFS
        drv->dbgfs_op_mode = debugfs_create_dir(op->name,
                                                drv->dbgfs_drv);
        if (!drv->dbgfs_op_mode) {
                IWL_ERR(drv,
                        "failed to create opmode debugfs directory\n");
                return op_mode;
        }
        dbgfs_dir = drv->dbgfs_op_mode;
#endif

        op_mode = ops->start(drv->trans, drv->cfg, &drv->fw, dbgfs_dir);

#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (!op_mode) {
                debugfs_remove_recursive(drv->dbgfs_op_mode);
                drv->dbgfs_op_mode = NULL;
        }
#endif

        return op_mode;
}

static void _iwl_op_mode_stop(struct iwl_drv *drv)
{
        /* op_mode can be NULL if its start failed */
        if (drv->op_mode) {
                iwl_op_mode_stop(drv->op_mode);
                drv->op_mode = NULL;

#ifdef CONFIG_IWLWIFI_DEBUGFS
                debugfs_remove_recursive(drv->dbgfs_op_mode);
                drv->dbgfs_op_mode = NULL;
#endif
        }
}

/**
 * iwl_req_fw_callback - callback when firmware was loaded
 *
 * If loaded successfully, copies the firmware into buffers
 * for the card to fetch (via DMA).
 */
static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
{
        struct iwl_drv *drv = context;
        struct iwl_fw *fw = &drv->fw;
        struct iwl_ucode_header *ucode;
        struct iwlwifi_opmode_table *op;
        int err;
        struct iwl_firmware_pieces *pieces;
        const unsigned int api_max = drv->cfg->ucode_api_max;
        unsigned int api_ok = drv->cfg->ucode_api_ok;
        const unsigned int api_min = drv->cfg->ucode_api_min;
        u32 api_ver;
        int i;
        bool load_module = false;

        fw->ucode_capa.max_probe_length = IWL_DEFAULT_MAX_PROBE_LENGTH;
        fw->ucode_capa.standard_phy_calibration_size =
                        IWL_DEFAULT_STANDARD_PHY_CALIBRATE_TBL_SIZE;
        fw->ucode_capa.n_scan_channels = IWL_DEFAULT_SCAN_CHANNELS;

        if (!api_ok)
                api_ok = api_max;

        pieces = kzalloc(sizeof(*pieces), GFP_KERNEL);
        if (!pieces)
                return;

        if (!ucode_raw) {
                if (drv->fw_index <= api_ok)
                        IWL_ERR(drv,
                                "request for firmware file '%s' failed.\n",
                                drv->firmware_name);
                goto try_again;
        }

        IWL_DEBUG_INFO(drv, "Loaded firmware file '%s' (%zd bytes).\n",
                       drv->firmware_name, ucode_raw->size);

        /* Make sure that we got at least the API version number */
        if (ucode_raw->size < 4) {
                IWL_ERR(drv, "File size way too small!\n");
                goto try_again;
        }

        /* Data from ucode file:  header followed by uCode images */
        ucode = (struct iwl_ucode_header *)ucode_raw->data;

        if (ucode->ver)
                err = iwl_parse_v1_v2_firmware(drv, ucode_raw, pieces);
        else
                err = iwl_parse_tlv_firmware(drv, ucode_raw, pieces,
                                             &fw->ucode_capa);

        if (err)
                goto try_again;

        api_ver = IWL_UCODE_API(drv->fw.ucode_ver);

        /*
         * api_ver should match the api version forming part of the
         * firmware filename ... but we don't check for that and only rely
         * on the API version read from firmware header from here on forward
         */
        /* no api version check required for experimental uCode */
        if (drv->fw_index != UCODE_EXPERIMENTAL_INDEX) {
                if (api_ver < api_min || api_ver > api_max) {
                        IWL_ERR(drv,
                                "Driver unable to support your firmware API. "
                                "Driver supports v%u, firmware is v%u.\n",
                                api_max, api_ver);
                        goto try_again;
                }

                if (api_ver < api_ok) {
                        if (api_ok != api_max)
                                IWL_ERR(drv, "Firmware has old API version, "
                                        "expected v%u through v%u, got v%u.\n",
                                        api_ok, api_max, api_ver);
                        else
                                IWL_ERR(drv, "Firmware has old API version, "
                                        "expected v%u, got v%u.\n",
                                        api_max, api_ver);
                        IWL_ERR(drv, "New firmware can be obtained from "
                                      "http://www.intellinuxwireless.org/.\n");
                }
        }

        /*
         * In mvm uCode there is no difference between data and instructions
         * sections.
         */
        if (!fw->mvm_fw && validate_sec_sizes(drv, pieces, drv->cfg))
                goto try_again;

        /* Allocate ucode buffers for card's bus-master loading ... */

        /* Runtime instructions and 2 copies of data:
         * 1) unmodified from disk
         * 2) backup cache for save/restore during power-downs */
        for (i = 0; i < IWL_UCODE_TYPE_MAX; i++)
                if (iwl_alloc_ucode(drv, pieces, i))
                        goto out_free_fw;

        if (pieces->dbg_dest_tlv) {
                drv->fw.dbg_dest_tlv =
                        kmemdup(pieces->dbg_dest_tlv,
                                sizeof(*pieces->dbg_dest_tlv) +
                                sizeof(pieces->dbg_dest_tlv->reg_ops[0]) *
                                drv->fw.dbg_dest_reg_num, GFP_KERNEL);

                if (!drv->fw.dbg_dest_tlv)
                        goto out_free_fw;
        }

        for (i = 0; i < ARRAY_SIZE(drv->fw.dbg_conf_tlv); i++) {
                if (pieces->dbg_conf_tlv[i]) {
                        drv->fw.dbg_conf_tlv_len[i] =
                                pieces->dbg_conf_tlv_len[i];
                        drv->fw.dbg_conf_tlv[i] =
                                kmemdup(pieces->dbg_conf_tlv[i],
                                        drv->fw.dbg_conf_tlv_len[i],
                                        GFP_KERNEL);
                        if (!drv->fw.dbg_conf_tlv[i])
                                goto out_free_fw;
                }
        }

        /* Now that we can no longer fail, copy information */

        /*
         * The (size - 16) / 12 formula is based on the information recorded
         * for each event, which is of mode 1 (including timestamp) for all
         * new microcodes that include this information.
         */
        fw->init_evtlog_ptr = pieces->init_evtlog_ptr;
        if (pieces->init_evtlog_size)
                fw->init_evtlog_size = (pieces->init_evtlog_size - 16)/12;
        else
                fw->init_evtlog_size =
                        drv->cfg->base_params->max_event_log_size;
        fw->init_errlog_ptr = pieces->init_errlog_ptr;
        fw->inst_evtlog_ptr = pieces->inst_evtlog_ptr;
        if (pieces->inst_evtlog_size)
                fw->inst_evtlog_size = (pieces->inst_evtlog_size - 16)/12;
        else
                fw->inst_evtlog_size =
                        drv->cfg->base_params->max_event_log_size;
        fw->inst_errlog_ptr = pieces->inst_errlog_ptr;

        /*
         * figure out the offset of chain noise reset and gain commands
         * base on the size of standard phy calibration commands table size
         */
        if (fw->ucode_capa.standard_phy_calibration_size >
            IWL_MAX_PHY_CALIBRATE_TBL_SIZE)
                fw->ucode_capa.standard_phy_calibration_size =
                        IWL_MAX_STANDARD_PHY_CALIBRATE_TBL_SIZE;

        /* We have our copies now, allow OS release its copies */
        release_firmware(ucode_raw);

        mutex_lock(&iwlwifi_opmode_table_mtx);
        if (fw->mvm_fw)
                op = &iwlwifi_opmode_table[MVM_OP_MODE];
        else
                op = &iwlwifi_opmode_table[DVM_OP_MODE];

        IWL_INFO(drv, "loaded firmware version %s op_mode %s\n",
                 drv->fw.fw_version, op->name);

        /* add this device to the list of devices using this op_mode */
        list_add_tail(&drv->list, &op->drv);

        if (op->ops) {
                drv->op_mode = _iwl_op_mode_start(drv, op);

                if (!drv->op_mode) {
                        mutex_unlock(&iwlwifi_opmode_table_mtx);
                        goto out_unbind;
                }
        } else {
                load_module = true;
        }
        mutex_unlock(&iwlwifi_opmode_table_mtx);

        /*
         * Complete the firmware request last so that
         * a driver unbind (stop) doesn't run while we
         * are doing the start() above.
         */
        complete(&drv->request_firmware_complete);

        /*
         * Load the module last so we don't block anything
         * else from proceeding if the module fails to load
         * or hangs loading.
         */
        if (load_module) {
                err = request_module("%s", op->name);
#ifdef CONFIG_IWLWIFI_OPMODE_MODULAR
                if (err)
                        IWL_ERR(drv,
                                "failed to load module %s (error %d), is dynamic loading enabled?\n",
                                op->name, err);
#endif
        }
        kfree(pieces);
        return;

 try_again:
        /* try next, if any */
        release_firmware(ucode_raw);
        if (iwl_request_firmware(drv, false))
                goto out_unbind;
        kfree(pieces);
        return;

 out_free_fw:
        IWL_ERR(drv, "failed to allocate pci memory\n");
        iwl_dealloc_ucode(drv);
        release_firmware(ucode_raw);
 out_unbind:
        kfree(pieces);
        complete(&drv->request_firmware_complete);
        device_release_driver(drv->trans->dev);
}

struct iwl_drv *iwl_drv_start(struct iwl_trans *trans,
                              const struct iwl_cfg *cfg)
{
        struct iwl_drv *drv;
        int ret;

        drv = kzalloc(sizeof(*drv), GFP_KERNEL);
        if (!drv) {
                ret = -ENOMEM;
                goto err;
        }

        drv->trans = trans;
        drv->dev = trans->dev;
        drv->cfg = cfg;

        init_completion(&drv->request_firmware_complete);
        INIT_LIST_HEAD(&drv->list);

#ifdef CONFIG_IWLWIFI_DEBUGFS
        /* Create the device debugfs entries. */
        drv->dbgfs_drv = debugfs_create_dir(dev_name(trans->dev),
                                            iwl_dbgfs_root);

        if (!drv->dbgfs_drv) {
                IWL_ERR(drv, "failed to create debugfs directory\n");
                ret = -ENOMEM;
                goto err_free_drv;
        }

        /* Create transport layer debugfs dir */
        drv->trans->dbgfs_dir = debugfs_create_dir("trans", drv->dbgfs_drv);

        if (!drv->trans->dbgfs_dir) {
                IWL_ERR(drv, "failed to create transport debugfs directory\n");
                ret = -ENOMEM;
                goto err_free_dbgfs;
        }
#endif

        ret = iwl_request_firmware(drv, true);
        if (ret) {
                IWL_ERR(trans, "Couldn't request the fw\n");
                goto err_fw;
        }

        return drv;

err_fw:
#ifdef CONFIG_IWLWIFI_DEBUGFS
err_free_dbgfs:
        debugfs_remove_recursive(drv->dbgfs_drv);
err_free_drv:
#endif
        kfree(drv);
err:
        return ERR_PTR(ret);
}

void iwl_drv_stop(struct iwl_drv *drv)
{
        wait_for_completion(&drv->request_firmware_complete);

        _iwl_op_mode_stop(drv);

        iwl_dealloc_ucode(drv);

        mutex_lock(&iwlwifi_opmode_table_mtx);
        /*
         * List is empty (this item wasn't added)
         * when firmware loading failed -- in that
         * case we can't remove it from any list.
         */
        if (!list_empty(&drv->list))
                list_del(&drv->list);
        mutex_unlock(&iwlwifi_opmode_table_mtx);

#ifdef CONFIG_IWLWIFI_DEBUGFS
        debugfs_remove_recursive(drv->dbgfs_drv);
#endif

        kfree(drv);
}


/* shared module parameters */
struct iwl_mod_params iwlwifi_mod_params = {
        .restart_fw = true,
        .bt_coex_active = true,
        .power_level = IWL_POWER_INDEX_1,
        .d0i3_disable = true,
#ifndef CONFIG_IWLWIFI_UAPSD
        .uapsd_disable = true,
#endif /* CONFIG_IWLWIFI_UAPSD */
        /* the rest are 0 by default */
};
IWL_EXPORT_SYMBOL(iwlwifi_mod_params);

int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops)
{
        int i;
        struct iwl_drv *drv;
        struct iwlwifi_opmode_table *op;

        mutex_lock(&iwlwifi_opmode_table_mtx);
        for (i = 0; i < ARRAY_SIZE(iwlwifi_opmode_table); i++) {
                op = &iwlwifi_opmode_table[i];
                if (strcmp(op->name, name))
                        continue;
                op->ops = ops;
                /* TODO: need to handle exceptional case */
                list_for_each_entry(drv, &op->drv, list)
                        drv->op_mode = _iwl_op_mode_start(drv, op);

                mutex_unlock(&iwlwifi_opmode_table_mtx);
                return 0;
        }
        mutex_unlock(&iwlwifi_opmode_table_mtx);
        return -EIO;
}
IWL_EXPORT_SYMBOL(iwl_opmode_register);

void iwl_opmode_deregister(const char *name)
{
        int i;
        struct iwl_drv *drv;

        mutex_lock(&iwlwifi_opmode_table_mtx);
        for (i = 0; i < ARRAY_SIZE(iwlwifi_opmode_table); i++) {
                if (strcmp(iwlwifi_opmode_table[i].name, name))
                        continue;
                iwlwifi_opmode_table[i].ops = NULL;

                /* call the stop routine for all devices */
                list_for_each_entry(drv, &iwlwifi_opmode_table[i].drv, list)
                        _iwl_op_mode_stop(drv);

                mutex_unlock(&iwlwifi_opmode_table_mtx);
                return;
        }
        mutex_unlock(&iwlwifi_opmode_table_mtx);
}
IWL_EXPORT_SYMBOL(iwl_opmode_deregister);

static int __init iwl_drv_init(void)
{
        int i;

        mutex_init(&iwlwifi_opmode_table_mtx);

        for (i = 0; i < ARRAY_SIZE(iwlwifi_opmode_table); i++)
                INIT_LIST_HEAD(&iwlwifi_opmode_table[i].drv);

        pr_info(DRV_DESCRIPTION "\n");
        pr_info(DRV_COPYRIGHT "\n");

#ifdef CONFIG_IWLWIFI_DEBUGFS
        /* Create the root of iwlwifi debugfs subsystem. */
        iwl_dbgfs_root = debugfs_create_dir(DRV_NAME, NULL);

        if (!iwl_dbgfs_root)
                return -EFAULT;
#endif

        return iwl_pci_register_driver();
}
module_init(iwl_drv_init);

static void __exit iwl_drv_exit(void)
{
        iwl_pci_unregister_driver();

#ifdef CONFIG_IWLWIFI_DEBUGFS
        debugfs_remove_recursive(iwl_dbgfs_root);
#endif
}
module_exit(iwl_drv_exit);

#ifdef CONFIG_IWLWIFI_DEBUG
module_param_named(debug, iwlwifi_mod_params.debug_level, uint,
                   S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "debug output mask");
#endif

module_param_named(swcrypto, iwlwifi_mod_params.sw_crypto, int, S_IRUGO);
MODULE_PARM_DESC(swcrypto, "using crypto in software (default 0 [hardware])");
module_param_named(11n_disable, iwlwifi_mod_params.disable_11n, uint, S_IRUGO);
MODULE_PARM_DESC(11n_disable,
        "disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX");
module_param_named(amsdu_size_8K, iwlwifi_mod_params.amsdu_size_8K,
                   int, S_IRUGO);
MODULE_PARM_DESC(amsdu_size_8K, "enable 8K amsdu size (default 0)");
module_param_named(fw_restart, iwlwifi_mod_params.restart_fw, bool, S_IRUGO);
MODULE_PARM_DESC(fw_restart, "restart firmware in case of error (default true)");

module_param_named(antenna_coupling, iwlwifi_mod_params.ant_coupling,
                   int, S_IRUGO);
MODULE_PARM_DESC(antenna_coupling,
                 "specify antenna coupling in dB (default: 0 dB)");

module_param_named(nvm_file, iwlwifi_mod_params.nvm_file, charp, S_IRUGO);
MODULE_PARM_DESC(nvm_file, "NVM file name");

module_param_named(d0i3_disable, iwlwifi_mod_params.d0i3_disable,
                   bool, S_IRUGO);
MODULE_PARM_DESC(d0i3_disable, "disable d0i3 functionality (default: Y)");

module_param_named(uapsd_disable, iwlwifi_mod_params.uapsd_disable,
                   bool, S_IRUGO | S_IWUSR);
#ifdef CONFIG_IWLWIFI_UAPSD
MODULE_PARM_DESC(uapsd_disable, "disable U-APSD functionality (default: N)");
#else
MODULE_PARM_DESC(uapsd_disable, "disable U-APSD functionality (default: Y)");
#endif

/*
 * set bt_coex_active to true, uCode will do kill/defer
 * every time the priority line is asserted (BT is sending signals on the
 * priority line in the PCIx).
 * set bt_coex_active to false, uCode will ignore the BT activity and
 * perform the normal operation
 *
 * User might experience transmit issue on some platform due to WiFi/BT
 * co-exist problem. The possible behaviors are:
 *   Able to scan and finding all the available AP
 *   Not able to associate with any AP
 * On those platforms, WiFi communication can be restored by set
 * "bt_coex_active" module parameter to "false"
 *
 * default: bt_coex_active = true (BT_COEX_ENABLE)
 */
module_param_named(bt_coex_active, iwlwifi_mod_params.bt_coex_active,
                bool, S_IRUGO);
MODULE_PARM_DESC(bt_coex_active, "enable wifi/bt co-exist (default: enable)");

module_param_named(led_mode, iwlwifi_mod_params.led_mode, int, S_IRUGO);
MODULE_PARM_DESC(led_mode, "0=system default, "
                "1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0)");

module_param_named(power_save, iwlwifi_mod_params.power_save,
                bool, S_IRUGO);
MODULE_PARM_DESC(power_save,
                 "enable WiFi power management (default: disable)");

module_param_named(power_level, iwlwifi_mod_params.power_level,
                int, S_IRUGO);
MODULE_PARM_DESC(power_level,
                 "default power save level (range from 1 - 5, default: 1)");

module_param_named(fw_monitor, iwlwifi_mod_params.fw_monitor, bool, S_IRUGO);
MODULE_PARM_DESC(fw_monitor,
                 "firmware monitor - to debug FW (default: false - needs lots of memory)");