text: /******************************************************************************
   *
   * 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"
  
  /* private includes */
  #include "iwl-fw-file.h"
  
  /******************************************************************************
   *
   * module boiler plate
   *
   ******************************************************************************/
  
  /*
   * module name, copyright, version, etc.
   */
  #define DRV_DESCRIPTION	"Intel(R) Wireless WiFi driver for Linux"
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  #define VD "d"
  #else
  #define VD
  #endif
  
  #define DRV_VERSION     IWLWIFI_VERSION VD
  
  MODULE_DESCRIPTION(DRV_DESCRIPTION);
  MODULE_VERSION(DRV_VERSION);
  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;
  	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;
  };
  
  /*
   * 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;
  
  	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;
  			drv->fw.img[IWL_UCODE_REGULAR].is_secure = 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;
  			drv->fw.img[IWL_UCODE_INIT].is_secure = 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;
  			drv->fw.img[IWL_UCODE_WOWLAN].is_secure = 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;
  		default:
  			IWL_DEBUG_INFO(drv, "unknown TLV: %d\n", tlv_type);
  			break;
  		}
  	}
  
  	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;
  
  	memset(&pieces, 0, sizeof(pieces));
  
  	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;
  
  	/* 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
  	}
  	return;
  
   try_again:
  	/* try next, if any */
  	release_firmware(ucode_raw);
  	if (iwl_request_firmware(drv, false))
  		goto out_unbind;
  	return;
  
   out_free_fw:
  	IWL_ERR(drv, "failed to allocate pci memory\n");
  	iwl_dealloc_ucode(drv);
  	release_firmware(ucode_raw);
   out_unbind:
  	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,
  	.wd_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 ", " DRV_VERSION "\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(wd_disable, iwlwifi_mod_params.wd_disable, int, S_IRUGO);
  MODULE_PARM_DESC(wd_disable,
  		"Disable stuck queue watchdog timer 0=system default, 1=disable (default: 1)");
  
  module_param_named(nvm_file, iwlwifi_mod_params.nvm_file, charp, S_IRUGO);
  MODULE_PARM_DESC(nvm_file, "NVM file name");
  
  module_param_named(uapsd_disable, iwlwifi_mod_params.uapsd_disable,
  		   bool, S_IRUGO);
  #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)");
  