wireless: Remove casts to same type

[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-testmode.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) 2010 - 2012 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2010 - 2012 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <net/net_namespace.h>
#include <linux/netdevice.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <net/netlink.h>

#include "iwl-dev.h"
#include "iwl-debug.h"
#include "iwl-io.h"
#include "iwl-agn.h"
#include "iwl-testmode.h"
#include "iwl-trans.h"
#include "iwl-fh.h"
#include "iwl-prph.h"


/* Periphery registers absolute lower bound. This is used in order to
 * differentiate registery access through HBUS_TARG_PRPH_* and
 * HBUS_TARG_MEM_* accesses.
 */
#define IWL_TM_ABS_PRPH_START (0xA00000)

/* The TLVs used in the gnl message policy between the kernel module and
 * user space application. iwl_testmode_gnl_msg_policy is to be carried
 * through the NL80211_CMD_TESTMODE channel regulated by nl80211.
 * See iwl-testmode.h
 */
static
struct nla_policy iwl_testmode_gnl_msg_policy[IWL_TM_ATTR_MAX] = {
        [IWL_TM_ATTR_COMMAND] = { .type = NLA_U32, },

        [IWL_TM_ATTR_UCODE_CMD_ID] = { .type = NLA_U8, },
        [IWL_TM_ATTR_UCODE_CMD_DATA] = { .type = NLA_UNSPEC, },

        [IWL_TM_ATTR_REG_OFFSET] = { .type = NLA_U32, },
        [IWL_TM_ATTR_REG_VALUE8] = { .type = NLA_U8, },
        [IWL_TM_ATTR_REG_VALUE32] = { .type = NLA_U32, },

        [IWL_TM_ATTR_SYNC_RSP] = { .type = NLA_UNSPEC, },
        [IWL_TM_ATTR_UCODE_RX_PKT] = { .type = NLA_UNSPEC, },

        [IWL_TM_ATTR_EEPROM] = { .type = NLA_UNSPEC, },

        [IWL_TM_ATTR_TRACE_ADDR] = { .type = NLA_UNSPEC, },
        [IWL_TM_ATTR_TRACE_DUMP] = { .type = NLA_UNSPEC, },
        [IWL_TM_ATTR_TRACE_SIZE] = { .type = NLA_U32, },

        [IWL_TM_ATTR_FIXRATE] = { .type = NLA_U32, },

        [IWL_TM_ATTR_UCODE_OWNER] = { .type = NLA_U8, },

        [IWL_TM_ATTR_MEM_ADDR] = { .type = NLA_U32, },
        [IWL_TM_ATTR_BUFFER_SIZE] = { .type = NLA_U32, },
        [IWL_TM_ATTR_BUFFER_DUMP] = { .type = NLA_UNSPEC, },

        [IWL_TM_ATTR_FW_VERSION] = { .type = NLA_U32, },
        [IWL_TM_ATTR_DEVICE_ID] = { .type = NLA_U32, },
        [IWL_TM_ATTR_FW_TYPE] = { .type = NLA_U32, },
        [IWL_TM_ATTR_FW_INST_SIZE] = { .type = NLA_U32, },
        [IWL_TM_ATTR_FW_DATA_SIZE] = { .type = NLA_U32, },

        [IWL_TM_ATTR_ENABLE_NOTIFICATION] = {.type = NLA_FLAG, },
};

/*
 * See the struct iwl_rx_packet in iwl-commands.h for the format of the
 * received events from the device
 */
static inline int get_event_length(struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        if (pkt)
                return le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
        else
                return 0;
}


/*
 * This function multicasts the spontaneous messages from the device to the
 * user space. It is invoked whenever there is a received messages
 * from the device. This function is called within the ISR of the rx handlers
 * in iwlagn driver.
 *
 * The parsing of the message content is left to the user space application,
 * The message content is treated as unattacked raw data and is encapsulated
 * with IWL_TM_ATTR_UCODE_RX_PKT multicasting to the user space.
 *
 * @priv: the instance of iwlwifi device
 * @rxb: pointer to rx data content received by the ISR
 *
 * See the message policies and TLVs in iwl_testmode_gnl_msg_policy[].
 * For the messages multicasting to the user application, the mandatory
 * TLV fields are :
 *      IWL_TM_ATTR_COMMAND must be IWL_TM_CMD_DEV2APP_UCODE_RX_PKT
 *      IWL_TM_ATTR_UCODE_RX_PKT for carrying the message content
 */

static void iwl_testmode_ucode_rx_pkt(struct iwl_priv *priv,
                                      struct iwl_rx_cmd_buffer *rxb)
{
        struct ieee80211_hw *hw = priv->hw;
        struct sk_buff *skb;
        void *data;
        int length;

        data = rxb_addr(rxb);
        length = get_event_length(rxb);

        if (!data || length == 0)
                return;

        skb = cfg80211_testmode_alloc_event_skb(hw->wiphy, 20 + length,
                                                                GFP_ATOMIC);
        if (skb == NULL) {
                IWL_ERR(priv,
                         "Run out of memory for messages to user space ?\n");
                return;
        }
        if (nla_put_u32(skb, IWL_TM_ATTR_COMMAND, IWL_TM_CMD_DEV2APP_UCODE_RX_PKT) ||
            /* the length doesn't include len_n_flags field, so add it manually */
            nla_put(skb, IWL_TM_ATTR_UCODE_RX_PKT, length + sizeof(__le32), data))
                goto nla_put_failure;
        cfg80211_testmode_event(skb, GFP_ATOMIC);
        return;

nla_put_failure:
        kfree_skb(skb);
        IWL_ERR(priv, "Ouch, overran buffer, check allocation!\n");
}

void iwl_testmode_init(struct iwl_priv *priv)
{
        priv->pre_rx_handler = NULL;
        priv->testmode_trace.trace_enabled = false;
        priv->testmode_mem.read_in_progress = false;
}

static void iwl_mem_cleanup(struct iwl_priv *priv)
{
        if (priv->testmode_mem.read_in_progress) {
                kfree(priv->testmode_mem.buff_addr);
                priv->testmode_mem.buff_addr = NULL;
                priv->testmode_mem.buff_size = 0;
                priv->testmode_mem.num_chunks = 0;
                priv->testmode_mem.read_in_progress = false;
        }
}

static void iwl_trace_cleanup(struct iwl_priv *priv)
{
        if (priv->testmode_trace.trace_enabled) {
                if (priv->testmode_trace.cpu_addr &&
                    priv->testmode_trace.dma_addr)
                        dma_free_coherent(priv->trans->dev,
                                        priv->testmode_trace.total_size,
                                        priv->testmode_trace.cpu_addr,
                                        priv->testmode_trace.dma_addr);
                priv->testmode_trace.trace_enabled = false;
                priv->testmode_trace.cpu_addr = NULL;
                priv->testmode_trace.trace_addr = NULL;
                priv->testmode_trace.dma_addr = 0;
                priv->testmode_trace.buff_size = 0;
                priv->testmode_trace.total_size = 0;
        }
}


void iwl_testmode_cleanup(struct iwl_priv *priv)
{
        iwl_trace_cleanup(priv);
        iwl_mem_cleanup(priv);
}


/*
 * This function handles the user application commands to the ucode.
 *
 * It retrieves the mandatory fields IWL_TM_ATTR_UCODE_CMD_ID and
 * IWL_TM_ATTR_UCODE_CMD_DATA and calls to the handler to send the
 * host command to the ucode.
 *
 * If any mandatory field is missing, -ENOMSG is replied to the user space
 * application; otherwise, waits for the host command to be sent and checks
 * the return code. In case or error, it is returned, otherwise a reply is
 * allocated and the reply RX packet
 * is returned.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_ucode(struct ieee80211_hw *hw, struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        struct iwl_host_cmd cmd;
        struct iwl_rx_packet *pkt;
        struct sk_buff *skb;
        void *reply_buf;
        u32 reply_len;
        int ret;
        bool cmd_want_skb;

        memset(&cmd, 0, sizeof(struct iwl_host_cmd));

        if (!tb[IWL_TM_ATTR_UCODE_CMD_ID] ||
            !tb[IWL_TM_ATTR_UCODE_CMD_DATA]) {
                IWL_ERR(priv, "Missing ucode command mandatory fields\n");
                return -ENOMSG;
        }

        cmd.flags = CMD_ON_DEMAND | CMD_SYNC;
        cmd_want_skb = nla_get_flag(tb[IWL_TM_ATTR_UCODE_CMD_SKB]);
        if (cmd_want_skb)
                cmd.flags |= CMD_WANT_SKB;

        cmd.id = nla_get_u8(tb[IWL_TM_ATTR_UCODE_CMD_ID]);
        cmd.data[0] = nla_data(tb[IWL_TM_ATTR_UCODE_CMD_DATA]);
        cmd.len[0] = nla_len(tb[IWL_TM_ATTR_UCODE_CMD_DATA]);
        cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
        IWL_DEBUG_INFO(priv, "testmode ucode command ID 0x%x, flags 0x%x,"
                                " len %d\n", cmd.id, cmd.flags, cmd.len[0]);

        ret = iwl_dvm_send_cmd(priv, &cmd);
        if (ret) {
                IWL_ERR(priv, "Failed to send hcmd\n");
                return ret;
        }
        if (!cmd_want_skb)
                return ret;

        /* Handling return of SKB to the user */
        pkt = cmd.resp_pkt;
        if (!pkt) {
                IWL_ERR(priv, "HCMD received a null response packet\n");
                return ret;
        }

        reply_len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
        skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy, reply_len + 20);
        reply_buf = kmalloc(reply_len, GFP_KERNEL);
        if (!skb || !reply_buf) {
                kfree_skb(skb);
                kfree(reply_buf);
                return -ENOMEM;
        }

        /* The reply is in a page, that we cannot send to user space. */
        memcpy(reply_buf, &(pkt->hdr), reply_len);
        iwl_free_resp(&cmd);

        if (nla_put_u32(skb, IWL_TM_ATTR_COMMAND, IWL_TM_CMD_DEV2APP_UCODE_RX_PKT) ||
            nla_put(skb, IWL_TM_ATTR_UCODE_RX_PKT, reply_len, reply_buf))
                goto nla_put_failure;
        return cfg80211_testmode_reply(skb);

nla_put_failure:
        IWL_DEBUG_INFO(priv, "Failed creating NL attributes\n");
        return -ENOMSG;
}


/*
 * This function handles the user application commands for register access.
 *
 * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
 * handlers respectively.
 *
 * If it's an unknown commdn ID, -ENOSYS is returned; or -ENOMSG if the
 * mandatory fields(IWL_TM_ATTR_REG_OFFSET,IWL_TM_ATTR_REG_VALUE32,
 * IWL_TM_ATTR_REG_VALUE8) are missing; Otherwise 0 is replied indicating
 * the success of the command execution.
 *
 * If IWL_TM_ATTR_COMMAND is IWL_TM_CMD_APP2DEV_REG_READ32, the register read
 * value is returned with IWL_TM_ATTR_REG_VALUE32.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_reg(struct ieee80211_hw *hw, struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        u32 ofs, val32, cmd;
        u8 val8;
        struct sk_buff *skb;
        int status = 0;

        if (!tb[IWL_TM_ATTR_REG_OFFSET]) {
                IWL_ERR(priv, "Missing register offset\n");
                return -ENOMSG;
        }
        ofs = nla_get_u32(tb[IWL_TM_ATTR_REG_OFFSET]);
        IWL_INFO(priv, "testmode register access command offset 0x%x\n", ofs);

        /* Allow access only to FH/CSR/HBUS in direct mode.
        Since we don't have the upper bounds for the CSR and HBUS segments,
        we will use only the upper bound of FH for sanity check. */
        cmd = nla_get_u32(tb[IWL_TM_ATTR_COMMAND]);
        if ((cmd == IWL_TM_CMD_APP2DEV_DIRECT_REG_READ32 ||
                cmd == IWL_TM_CMD_APP2DEV_DIRECT_REG_WRITE32 ||
                cmd == IWL_TM_CMD_APP2DEV_DIRECT_REG_WRITE8) &&
                (ofs >= FH_MEM_UPPER_BOUND)) {
                IWL_ERR(priv, "offset out of segment (0x0 - 0x%x)\n",
                        FH_MEM_UPPER_BOUND);
                return -EINVAL;
        }

        switch (cmd) {
        case IWL_TM_CMD_APP2DEV_DIRECT_REG_READ32:
                val32 = iwl_read_direct32(priv->trans, ofs);
                IWL_INFO(priv, "32bit value to read 0x%x\n", val32);

                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy, 20);
                if (!skb) {
                        IWL_ERR(priv, "Memory allocation fail\n");
                        return -ENOMEM;
                }
                if (nla_put_u32(skb, IWL_TM_ATTR_REG_VALUE32, val32))
                        goto nla_put_failure;
                status = cfg80211_testmode_reply(skb);
                if (status < 0)
                        IWL_ERR(priv, "Error sending msg : %d\n", status);
                break;
        case IWL_TM_CMD_APP2DEV_DIRECT_REG_WRITE32:
                if (!tb[IWL_TM_ATTR_REG_VALUE32]) {
                        IWL_ERR(priv, "Missing value to write\n");
                        return -ENOMSG;
                } else {
                        val32 = nla_get_u32(tb[IWL_TM_ATTR_REG_VALUE32]);
                        IWL_INFO(priv, "32bit value to write 0x%x\n", val32);
                        iwl_write_direct32(priv->trans, ofs, val32);
                }
                break;
        case IWL_TM_CMD_APP2DEV_DIRECT_REG_WRITE8:
                if (!tb[IWL_TM_ATTR_REG_VALUE8]) {
                        IWL_ERR(priv, "Missing value to write\n");
                        return -ENOMSG;
                } else {
                        val8 = nla_get_u8(tb[IWL_TM_ATTR_REG_VALUE8]);
                        IWL_INFO(priv, "8bit value to write 0x%x\n", val8);
                        iwl_write8(priv->trans, ofs, val8);
                }
                break;
        default:
                IWL_ERR(priv, "Unknown testmode register command ID\n");
                return -ENOSYS;
        }

        return status;

nla_put_failure:
        kfree_skb(skb);
        return -EMSGSIZE;
}


static int iwl_testmode_cfg_init_calib(struct iwl_priv *priv)
{
        struct iwl_notification_wait calib_wait;
        static const u8 calib_complete[] = {
                CALIBRATION_COMPLETE_NOTIFICATION
        };
        int ret;

        iwl_init_notification_wait(&priv->notif_wait, &calib_wait,
                                   calib_complete, ARRAY_SIZE(calib_complete),
                                   NULL, NULL);
        ret = iwl_init_alive_start(priv);
        if (ret) {
                IWL_ERR(priv, "Fail init calibration: %d\n", ret);
                goto cfg_init_calib_error;
        }

        ret = iwl_wait_notification(&priv->notif_wait, &calib_wait, 2 * HZ);
        if (ret)
                IWL_ERR(priv, "Error detecting"
                        " CALIBRATION_COMPLETE_NOTIFICATION: %d\n", ret);
        return ret;

cfg_init_calib_error:
        iwl_remove_notification(&priv->notif_wait, &calib_wait);
        return ret;
}

/*
 * This function handles the user application commands for driver.
 *
 * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
 * handlers respectively.
 *
 * If it's an unknown commdn ID, -ENOSYS is replied; otherwise, the returned
 * value of the actual command execution is replied to the user application.
 *
 * If there's any message responding to the user space, IWL_TM_ATTR_SYNC_RSP
 * is used for carry the message while IWL_TM_ATTR_COMMAND must set to
 * IWL_TM_CMD_DEV2APP_SYNC_RSP.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_driver(struct ieee80211_hw *hw, struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        struct iwl_trans *trans = priv->trans;
        struct sk_buff *skb;
        unsigned char *rsp_data_ptr = NULL;
        int status = 0, rsp_data_len = 0;
        u32 devid, inst_size = 0, data_size = 0;
        const struct fw_img *img;

        switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
        case IWL_TM_CMD_APP2DEV_GET_DEVICENAME:
                rsp_data_ptr = (unsigned char *)priv->cfg->name;
                rsp_data_len = strlen(priv->cfg->name);
                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
                                                        rsp_data_len + 20);
                if (!skb) {
                        IWL_ERR(priv, "Memory allocation fail\n");
                        return -ENOMEM;
                }
                if (nla_put_u32(skb, IWL_TM_ATTR_COMMAND,
                                IWL_TM_CMD_DEV2APP_SYNC_RSP) ||
                    nla_put(skb, IWL_TM_ATTR_SYNC_RSP,
                            rsp_data_len, rsp_data_ptr))
                        goto nla_put_failure;
                status = cfg80211_testmode_reply(skb);
                if (status < 0)
                        IWL_ERR(priv, "Error sending msg : %d\n", status);
                break;

        case IWL_TM_CMD_APP2DEV_LOAD_INIT_FW:
                status = iwl_load_ucode_wait_alive(priv, IWL_UCODE_INIT);
                if (status)
                        IWL_ERR(priv, "Error loading init ucode: %d\n", status);
                break;

        case IWL_TM_CMD_APP2DEV_CFG_INIT_CALIB:
                iwl_testmode_cfg_init_calib(priv);
                priv->ucode_loaded = false;
                iwl_trans_stop_device(trans);
                break;

        case IWL_TM_CMD_APP2DEV_LOAD_RUNTIME_FW:
                status = iwl_load_ucode_wait_alive(priv, IWL_UCODE_REGULAR);
                if (status) {
                        IWL_ERR(priv,
                                "Error loading runtime ucode: %d\n", status);
                        break;
                }
                status = iwl_alive_start(priv);
                if (status)
                        IWL_ERR(priv,
                                "Error starting the device: %d\n", status);
                break;

        case IWL_TM_CMD_APP2DEV_LOAD_WOWLAN_FW:
                iwl_scan_cancel_timeout(priv, 200);
                priv->ucode_loaded = false;
                iwl_trans_stop_device(trans);
                status = iwl_load_ucode_wait_alive(priv, IWL_UCODE_WOWLAN);
                if (status) {
                        IWL_ERR(priv,
                                "Error loading WOWLAN ucode: %d\n", status);
                        break;
                }
                status = iwl_alive_start(priv);
                if (status)
                        IWL_ERR(priv,
                                "Error starting the device: %d\n", status);
                break;

        case IWL_TM_CMD_APP2DEV_GET_EEPROM:
                if (priv->eeprom) {
                        skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
                                priv->cfg->base_params->eeprom_size + 20);
                        if (!skb) {
                                IWL_ERR(priv, "Memory allocation fail\n");
                                return -ENOMEM;
                        }
                        if (nla_put_u32(skb, IWL_TM_ATTR_COMMAND,
                                        IWL_TM_CMD_DEV2APP_EEPROM_RSP) ||
                            nla_put(skb, IWL_TM_ATTR_EEPROM,
                                    priv->cfg->base_params->eeprom_size,
                                    priv->eeprom))
                                goto nla_put_failure;
                        status = cfg80211_testmode_reply(skb);
                        if (status < 0)
                                IWL_ERR(priv, "Error sending msg : %d\n",
                                        status);
                } else
                        return -EFAULT;
                break;

        case IWL_TM_CMD_APP2DEV_FIXRATE_REQ:
                if (!tb[IWL_TM_ATTR_FIXRATE]) {
                        IWL_ERR(priv, "Missing fixrate setting\n");
                        return -ENOMSG;
                }
                priv->tm_fixed_rate = nla_get_u32(tb[IWL_TM_ATTR_FIXRATE]);
                break;

        case IWL_TM_CMD_APP2DEV_GET_FW_VERSION:
                IWL_INFO(priv, "uCode version raw: 0x%x\n",
                         priv->fw->ucode_ver);

                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy, 20);
                if (!skb) {
                        IWL_ERR(priv, "Memory allocation fail\n");
                        return -ENOMEM;
                }
                if (nla_put_u32(skb, IWL_TM_ATTR_FW_VERSION,
                                priv->fw->ucode_ver))
                        goto nla_put_failure;
                status = cfg80211_testmode_reply(skb);
                if (status < 0)
                        IWL_ERR(priv, "Error sending msg : %d\n", status);
                break;

        case IWL_TM_CMD_APP2DEV_GET_DEVICE_ID:
                devid = priv->trans->hw_id;
                IWL_INFO(priv, "hw version: 0x%x\n", devid);

                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy, 20);
                if (!skb) {
                        IWL_ERR(priv, "Memory allocation fail\n");
                        return -ENOMEM;
                }
                if (nla_put_u32(skb, IWL_TM_ATTR_DEVICE_ID, devid))
                        goto nla_put_failure;
                status = cfg80211_testmode_reply(skb);
                if (status < 0)
                        IWL_ERR(priv, "Error sending msg : %d\n", status);
                break;

        case IWL_TM_CMD_APP2DEV_GET_FW_INFO:
                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy, 20 + 8);
                if (!skb) {
                        IWL_ERR(priv, "Memory allocation fail\n");
                        return -ENOMEM;
                }
                if (!priv->ucode_loaded) {
                        IWL_ERR(priv, "No uCode has not been loaded\n");
                        return -EINVAL;
                } else {
                        img = &priv->fw->img[priv->cur_ucode];
                        inst_size = img->sec[IWL_UCODE_SECTION_INST].len;
                        data_size = img->sec[IWL_UCODE_SECTION_DATA].len;
                }
                if (nla_put_u32(skb, IWL_TM_ATTR_FW_TYPE, priv->cur_ucode) ||
                    nla_put_u32(skb, IWL_TM_ATTR_FW_INST_SIZE, inst_size) ||
                    nla_put_u32(skb, IWL_TM_ATTR_FW_DATA_SIZE, data_size))
                        goto nla_put_failure;
                status = cfg80211_testmode_reply(skb);
                if (status < 0)
                        IWL_ERR(priv, "Error sending msg : %d\n", status);
                break;

        default:
                IWL_ERR(priv, "Unknown testmode driver command ID\n");
                return -ENOSYS;
        }
        return status;

nla_put_failure:
        kfree_skb(skb);
        return -EMSGSIZE;
}


/*
 * This function handles the user application commands for uCode trace
 *
 * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
 * handlers respectively.
 *
 * If it's an unknown commdn ID, -ENOSYS is replied; otherwise, the returned
 * value of the actual command execution is replied to the user application.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_trace(struct ieee80211_hw *hw, struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        struct sk_buff *skb;
        int status = 0;
        struct device *dev = priv->trans->dev;

        switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
        case IWL_TM_CMD_APP2DEV_BEGIN_TRACE:
                if (priv->testmode_trace.trace_enabled)
                        return -EBUSY;

                if (!tb[IWL_TM_ATTR_TRACE_SIZE])
                        priv->testmode_trace.buff_size = TRACE_BUFF_SIZE_DEF;
                else
                        priv->testmode_trace.buff_size =
                                nla_get_u32(tb[IWL_TM_ATTR_TRACE_SIZE]);
                if (!priv->testmode_trace.buff_size)
                        return -EINVAL;
                if (priv->testmode_trace.buff_size < TRACE_BUFF_SIZE_MIN ||
                    priv->testmode_trace.buff_size > TRACE_BUFF_SIZE_MAX)
                        return -EINVAL;

                priv->testmode_trace.total_size =
                        priv->testmode_trace.buff_size + TRACE_BUFF_PADD;
                priv->testmode_trace.cpu_addr =
                        dma_alloc_coherent(dev,
                                           priv->testmode_trace.total_size,
                                           &priv->testmode_trace.dma_addr,
                                           GFP_KERNEL);
                if (!priv->testmode_trace.cpu_addr)
                        return -ENOMEM;
                priv->testmode_trace.trace_enabled = true;
                priv->testmode_trace.trace_addr = (u8 *)PTR_ALIGN(
                        priv->testmode_trace.cpu_addr, 0x100);
                memset(priv->testmode_trace.trace_addr, 0x03B,
                        priv->testmode_trace.buff_size);
                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
                        sizeof(priv->testmode_trace.dma_addr) + 20);
                if (!skb) {
                        IWL_ERR(priv, "Memory allocation fail\n");
                        iwl_trace_cleanup(priv);
                        return -ENOMEM;
                }
                if (nla_put(skb, IWL_TM_ATTR_TRACE_ADDR,
                            sizeof(priv->testmode_trace.dma_addr),
                            (u64 *)&priv->testmode_trace.dma_addr))
                        goto nla_put_failure;
                status = cfg80211_testmode_reply(skb);
                if (status < 0) {
                        IWL_ERR(priv, "Error sending msg : %d\n", status);
                }
                priv->testmode_trace.num_chunks =
                        DIV_ROUND_UP(priv->testmode_trace.buff_size,
                                     DUMP_CHUNK_SIZE);
                break;

        case IWL_TM_CMD_APP2DEV_END_TRACE:
                iwl_trace_cleanup(priv);
                break;
        default:
                IWL_ERR(priv, "Unknown testmode mem command ID\n");
                return -ENOSYS;
        }
        return status;

nla_put_failure:
        kfree_skb(skb);
        if (nla_get_u32(tb[IWL_TM_ATTR_COMMAND]) ==
            IWL_TM_CMD_APP2DEV_BEGIN_TRACE)
                iwl_trace_cleanup(priv);
        return -EMSGSIZE;
}

static int iwl_testmode_trace_dump(struct ieee80211_hw *hw,
                                   struct sk_buff *skb,
                                   struct netlink_callback *cb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        int idx, length;

        if (priv->testmode_trace.trace_enabled &&
            priv->testmode_trace.trace_addr) {
                idx = cb->args[4];
                if (idx >= priv->testmode_trace.num_chunks)
                        return -ENOENT;
                length = DUMP_CHUNK_SIZE;
                if (((idx + 1) == priv->testmode_trace.num_chunks) &&
                    (priv->testmode_trace.buff_size % DUMP_CHUNK_SIZE))
                        length = priv->testmode_trace.buff_size %
                                DUMP_CHUNK_SIZE;

                if (nla_put(skb, IWL_TM_ATTR_TRACE_DUMP, length,
                            priv->testmode_trace.trace_addr +
                            (DUMP_CHUNK_SIZE * idx)))
                        goto nla_put_failure;
                idx++;
                cb->args[4] = idx;
                return 0;
        } else
                return -EFAULT;

 nla_put_failure:
        return -ENOBUFS;
}

/*
 * This function handles the user application switch ucode ownership.
 *
 * It retrieves the mandatory fields IWL_TM_ATTR_UCODE_OWNER and
 * decide who the current owner of the uCode
 *
 * If the current owner is OWNERSHIP_TM, then the only host command
 * can deliver to uCode is from testmode, all the other host commands
 * will dropped.
 *
 * default driver is the owner of uCode in normal operational mode
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_ownership(struct ieee80211_hw *hw, struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        u8 owner;

        if (!tb[IWL_TM_ATTR_UCODE_OWNER]) {
                IWL_ERR(priv, "Missing ucode owner\n");
                return -ENOMSG;
        }

        owner = nla_get_u8(tb[IWL_TM_ATTR_UCODE_OWNER]);
        if (owner == IWL_OWNERSHIP_DRIVER) {
                priv->ucode_owner = owner;
                priv->pre_rx_handler = NULL;
        } else if (owner == IWL_OWNERSHIP_TM) {
                priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
                priv->ucode_owner = owner;
        } else {
                IWL_ERR(priv, "Invalid owner\n");
                return -EINVAL;
        }
        return 0;
}

static int iwl_testmode_indirect_read(struct iwl_priv *priv, u32 addr, u32 size)
{
        struct iwl_trans *trans = priv->trans;
        unsigned long flags;
        int i;

        if (size & 0x3)
                return -EINVAL;
        priv->testmode_mem.buff_size = size;
        priv->testmode_mem.buff_addr =
                kmalloc(priv->testmode_mem.buff_size, GFP_KERNEL);
        if (priv->testmode_mem.buff_addr == NULL)
                return -ENOMEM;

        /* Hard-coded periphery absolute address */
        if (IWL_TM_ABS_PRPH_START <= addr &&
                addr < IWL_TM_ABS_PRPH_START + PRPH_END) {
                        spin_lock_irqsave(&trans->reg_lock, flags);
                        iwl_grab_nic_access(trans);
                        iwl_write32(trans, HBUS_TARG_PRPH_RADDR,
                                addr | (3 << 24));
                        for (i = 0; i < size; i += 4)
                                *(u32 *)(priv->testmode_mem.buff_addr + i) =
                                        iwl_read32(trans, HBUS_TARG_PRPH_RDAT);
                        iwl_release_nic_access(trans);
                        spin_unlock_irqrestore(&trans->reg_lock, flags);
        } else { /* target memory (SRAM) */
                _iwl_read_targ_mem_words(trans, addr,
                        priv->testmode_mem.buff_addr,
                        priv->testmode_mem.buff_size / 4);
        }

        priv->testmode_mem.num_chunks =
                DIV_ROUND_UP(priv->testmode_mem.buff_size, DUMP_CHUNK_SIZE);
        priv->testmode_mem.read_in_progress = true;
        return 0;

}

static int iwl_testmode_indirect_write(struct iwl_priv *priv, u32 addr,
        u32 size, unsigned char *buf)
{
        struct iwl_trans *trans = priv->trans;
        u32 val, i;
        unsigned long flags;

        if (IWL_TM_ABS_PRPH_START <= addr &&
                addr < IWL_TM_ABS_PRPH_START + PRPH_END) {
                        /* Periphery writes can be 1-3 bytes long, or DWORDs */
                        if (size < 4) {
                                memcpy(&val, buf, size);
                                spin_lock_irqsave(&trans->reg_lock, flags);
                                iwl_grab_nic_access(trans);
                                iwl_write32(trans, HBUS_TARG_PRPH_WADDR,
                                            (addr & 0x0000FFFF) |
                                            ((size - 1) << 24));
                                iwl_write32(trans, HBUS_TARG_PRPH_WDAT, val);
                                iwl_release_nic_access(trans);
                                /* needed after consecutive writes w/o read */
                                mmiowb();
                                spin_unlock_irqrestore(&trans->reg_lock, flags);
                        } else {
                                if (size % 4)
                                        return -EINVAL;
                                for (i = 0; i < size; i += 4)
                                        iwl_write_prph(trans, addr+i,
                                                *(u32 *)(buf+i));
                        }
        } else if (iwlagn_hw_valid_rtc_data_addr(addr) ||
                (IWLAGN_RTC_INST_LOWER_BOUND <= addr &&
                addr < IWLAGN_RTC_INST_UPPER_BOUND)) {
                        _iwl_write_targ_mem_words(trans, addr, buf, size/4);
        } else
                return -EINVAL;
        return 0;
}

/*
 * This function handles the user application commands for SRAM data dump
 *
 * It retrieves the mandatory fields IWL_TM_ATTR_SRAM_ADDR and
 * IWL_TM_ATTR_SRAM_SIZE to decide the memory area for SRAM data reading
 *
 * Several error will be retured, -EBUSY if the SRAM data retrieved by
 * previous command has not been delivered to userspace, or -ENOMSG if
 * the mandatory fields (IWL_TM_ATTR_SRAM_ADDR,IWL_TM_ATTR_SRAM_SIZE)
 * are missing, or -ENOMEM if the buffer allocation fails.
 *
 * Otherwise 0 is replied indicating the success of the SRAM reading.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_indirect_mem(struct ieee80211_hw *hw,
        struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        u32 addr, size, cmd;
        unsigned char *buf;

        /* Both read and write should be blocked, for atomicity */
        if (priv->testmode_mem.read_in_progress)
                return -EBUSY;

        cmd = nla_get_u32(tb[IWL_TM_ATTR_COMMAND]);
        if (!tb[IWL_TM_ATTR_MEM_ADDR]) {
                IWL_ERR(priv, "Error finding memory offset address\n");
                return -ENOMSG;
        }
        addr = nla_get_u32(tb[IWL_TM_ATTR_MEM_ADDR]);
        if (!tb[IWL_TM_ATTR_BUFFER_SIZE]) {
                IWL_ERR(priv, "Error finding size for memory reading\n");
                return -ENOMSG;
        }
        size = nla_get_u32(tb[IWL_TM_ATTR_BUFFER_SIZE]);

        if (cmd == IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_READ)
                return iwl_testmode_indirect_read(priv, addr,  size);
        else {
                if (!tb[IWL_TM_ATTR_BUFFER_DUMP])
                        return -EINVAL;
                buf = (unsigned char *) nla_data(tb[IWL_TM_ATTR_BUFFER_DUMP]);
                return iwl_testmode_indirect_write(priv, addr, size, buf);
        }
}

static int iwl_testmode_buffer_dump(struct ieee80211_hw *hw,
                                    struct sk_buff *skb,
                                    struct netlink_callback *cb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        int idx, length;

        if (priv->testmode_mem.read_in_progress) {
                idx = cb->args[4];
                if (idx >= priv->testmode_mem.num_chunks) {
                        iwl_mem_cleanup(priv);
                        return -ENOENT;
                }
                length = DUMP_CHUNK_SIZE;
                if (((idx + 1) == priv->testmode_mem.num_chunks) &&
                    (priv->testmode_mem.buff_size % DUMP_CHUNK_SIZE))
                        length = priv->testmode_mem.buff_size %
                                DUMP_CHUNK_SIZE;

                if (nla_put(skb, IWL_TM_ATTR_BUFFER_DUMP, length,
                            priv->testmode_mem.buff_addr +
                            (DUMP_CHUNK_SIZE * idx)))
                        goto nla_put_failure;
                idx++;
                cb->args[4] = idx;
                return 0;
        } else
                return -EFAULT;

 nla_put_failure:
        return -ENOBUFS;
}

static int iwl_testmode_notifications(struct ieee80211_hw *hw,
        struct nlattr **tb)
{
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        bool enable;

        enable = nla_get_flag(tb[IWL_TM_ATTR_ENABLE_NOTIFICATION]);
        if (enable)
                priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
        else
                priv->pre_rx_handler = NULL;
        return 0;
}


/* The testmode gnl message handler that takes the gnl message from the
 * user space and parses it per the policy iwl_testmode_gnl_msg_policy, then
 * invoke the corresponding handlers.
 *
 * This function is invoked when there is user space application sending
 * gnl message through the testmode tunnel NL80211_CMD_TESTMODE regulated
 * by nl80211.
 *
 * It retrieves the mandatory field, IWL_TM_ATTR_COMMAND, before
 * dispatching it to the corresponding handler.
 *
 * If IWL_TM_ATTR_COMMAND is missing, -ENOMSG is replied to user application;
 * -ENOSYS is replied to the user application if the command is unknown;
 * Otherwise, the command is dispatched to the respective handler.
 *
 * @hw: ieee80211_hw object that represents the device
 * @data: pointer to user space message
 * @len: length in byte of @data
 */
int iwlagn_mac_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
{
        struct nlattr *tb[IWL_TM_ATTR_MAX];
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        int result;

        result = nla_parse(tb, IWL_TM_ATTR_MAX - 1, data, len,
                        iwl_testmode_gnl_msg_policy);
        if (result != 0) {
                IWL_ERR(priv, "Error parsing the gnl message : %d\n", result);
                return result;
        }

        /* IWL_TM_ATTR_COMMAND is absolutely mandatory */
        if (!tb[IWL_TM_ATTR_COMMAND]) {
                IWL_ERR(priv, "Missing testmode command type\n");
                return -ENOMSG;
        }
        /* in case multiple accesses to the device happens */
        mutex_lock(&priv->mutex);

        switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
        case IWL_TM_CMD_APP2DEV_UCODE:
                IWL_DEBUG_INFO(priv, "testmode cmd to uCode\n");
                result = iwl_testmode_ucode(hw, tb);
                break;
        case IWL_TM_CMD_APP2DEV_DIRECT_REG_READ32:
        case IWL_TM_CMD_APP2DEV_DIRECT_REG_WRITE32:
        case IWL_TM_CMD_APP2DEV_DIRECT_REG_WRITE8:
                IWL_DEBUG_INFO(priv, "testmode cmd to register\n");
                result = iwl_testmode_reg(hw, tb);
                break;
        case IWL_TM_CMD_APP2DEV_GET_DEVICENAME:
        case IWL_TM_CMD_APP2DEV_LOAD_INIT_FW:
        case IWL_TM_CMD_APP2DEV_CFG_INIT_CALIB:
        case IWL_TM_CMD_APP2DEV_LOAD_RUNTIME_FW:
        case IWL_TM_CMD_APP2DEV_GET_EEPROM:
        case IWL_TM_CMD_APP2DEV_FIXRATE_REQ:
        case IWL_TM_CMD_APP2DEV_LOAD_WOWLAN_FW:
        case IWL_TM_CMD_APP2DEV_GET_FW_VERSION:
        case IWL_TM_CMD_APP2DEV_GET_DEVICE_ID:
        case IWL_TM_CMD_APP2DEV_GET_FW_INFO:
                IWL_DEBUG_INFO(priv, "testmode cmd to driver\n");
                result = iwl_testmode_driver(hw, tb);
                break;

        case IWL_TM_CMD_APP2DEV_BEGIN_TRACE:
        case IWL_TM_CMD_APP2DEV_END_TRACE:
        case IWL_TM_CMD_APP2DEV_READ_TRACE:
                IWL_DEBUG_INFO(priv, "testmode uCode trace cmd to driver\n");
                result = iwl_testmode_trace(hw, tb);
                break;

        case IWL_TM_CMD_APP2DEV_OWNERSHIP:
                IWL_DEBUG_INFO(priv, "testmode change uCode ownership\n");
                result = iwl_testmode_ownership(hw, tb);
                break;

        case IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_READ:
        case IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_WRITE:
                IWL_DEBUG_INFO(priv, "testmode indirect memory cmd "
                        "to driver\n");
                result = iwl_testmode_indirect_mem(hw, tb);
                break;

        case IWL_TM_CMD_APP2DEV_NOTIFICATIONS:
                IWL_DEBUG_INFO(priv, "testmode notifications cmd "
                        "to driver\n");
                result = iwl_testmode_notifications(hw, tb);
                break;

        default:
                IWL_ERR(priv, "Unknown testmode command\n");
                result = -ENOSYS;
                break;
        }

        mutex_unlock(&priv->mutex);
        return result;
}

int iwlagn_mac_testmode_dump(struct ieee80211_hw *hw, struct sk_buff *skb,
                      struct netlink_callback *cb,
                      void *data, int len)
{
        struct nlattr *tb[IWL_TM_ATTR_MAX];
        struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
        int result;
        u32 cmd;

        if (cb->args[3]) {
                /* offset by 1 since commands start at 0 */
                cmd = cb->args[3] - 1;
        } else {
                result = nla_parse(tb, IWL_TM_ATTR_MAX - 1, data, len,
                                iwl_testmode_gnl_msg_policy);
                if (result) {
                        IWL_ERR(priv,
                                "Error parsing the gnl message : %d\n", result);
                        return result;
                }

                /* IWL_TM_ATTR_COMMAND is absolutely mandatory */
                if (!tb[IWL_TM_ATTR_COMMAND]) {
                        IWL_ERR(priv, "Missing testmode command type\n");
                        return -ENOMSG;
                }
                cmd = nla_get_u32(tb[IWL_TM_ATTR_COMMAND]);
                cb->args[3] = cmd + 1;
        }

        /* in case multiple accesses to the device happens */
        mutex_lock(&priv->mutex);
        switch (cmd) {
        case IWL_TM_CMD_APP2DEV_READ_TRACE:
                IWL_DEBUG_INFO(priv, "uCode trace cmd to driver\n");
                result = iwl_testmode_trace_dump(hw, skb, cb);
                break;
        case IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_DUMP:
                IWL_DEBUG_INFO(priv, "testmode sram dump cmd to driver\n");
                result = iwl_testmode_buffer_dump(hw, skb, cb);
                break;
        default:
                result = -EINVAL;
                break;
        }

        mutex_unlock(&priv->mutex);
        return result;
}