drivers/net/wireless/iwlwifi/iwl-hcmd.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  * Tomas Winkler <tomas.winkler@intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/version.h>
  32 #include <net/mac80211.h>
  33
  34 #include "iwl-4965.h" /* FIXME: remove */
  35 #include "iwl-debug.h"
  36 #include "iwl-eeprom.h"
  37 #include "iwl-core.h"
  38
  39
  40 #define IWL_CMD(x) case x : return #x
  41
  42 const char *get_cmd_string(u8 cmd)
  43 {
  44         switch (cmd) {
  45                 IWL_CMD(REPLY_ALIVE);
  46                 IWL_CMD(REPLY_ERROR);
  47                 IWL_CMD(REPLY_RXON);
  48                 IWL_CMD(REPLY_RXON_ASSOC);
  49                 IWL_CMD(REPLY_QOS_PARAM);
  50                 IWL_CMD(REPLY_RXON_TIMING);
  51                 IWL_CMD(REPLY_ADD_STA);
  52                 IWL_CMD(REPLY_REMOVE_STA);
  53                 IWL_CMD(REPLY_REMOVE_ALL_STA);
  54                 IWL_CMD(REPLY_TX);
  55                 IWL_CMD(REPLY_RATE_SCALE);
  56                 IWL_CMD(REPLY_LEDS_CMD);
  57                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
  58                 IWL_CMD(RADAR_NOTIFICATION);
  59                 IWL_CMD(REPLY_QUIET_CMD);
  60                 IWL_CMD(REPLY_CHANNEL_SWITCH);
  61                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
  62                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
  63                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
  64                 IWL_CMD(POWER_TABLE_CMD);
  65                 IWL_CMD(PM_SLEEP_NOTIFICATION);
  66                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
  67                 IWL_CMD(REPLY_SCAN_CMD);
  68                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
  69                 IWL_CMD(SCAN_START_NOTIFICATION);
  70                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
  71                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
  72                 IWL_CMD(BEACON_NOTIFICATION);
  73                 IWL_CMD(REPLY_TX_BEACON);
  74                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
  75                 IWL_CMD(QUIET_NOTIFICATION);
  76                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
  77                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
  78                 IWL_CMD(REPLY_BT_CONFIG);
  79                 IWL_CMD(REPLY_STATISTICS_CMD);
  80                 IWL_CMD(STATISTICS_NOTIFICATION);
  81                 IWL_CMD(REPLY_CARD_STATE_CMD);
  82                 IWL_CMD(CARD_STATE_NOTIFICATION);
  83                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
  84                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
  85                 IWL_CMD(SENSITIVITY_CMD);
  86                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
  87                 IWL_CMD(REPLY_RX_PHY_CMD);
  88                 IWL_CMD(REPLY_RX_MPDU_CMD);
  89                 IWL_CMD(REPLY_RX);
  90                 IWL_CMD(REPLY_COMPRESSED_BA);
  91         default:
  92                 return "UNKNOWN";
  93
  94         }
  95 }
  96 EXPORT_SYMBOL(get_cmd_string);
  97
  98 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
  99
 100 static int iwl_generic_cmd_callback(struct iwl_priv *priv,
 101                                     struct iwl_cmd *cmd, struct sk_buff *skb)
 102 {
 103         struct iwl4965_rx_packet *pkt = NULL;
 104
 105         if (!skb) {
 106                 IWL_ERROR("Error: Response NULL in %s.\n",
 107                                 get_cmd_string(cmd->hdr.cmd));
 108                 return 1;
 109         }
 110
 111         pkt = (struct iwl4965_rx_packet *)skb->data;
 112         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 113                 IWL_ERROR("Bad return from %s (0x%08X)\n",
 114                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 115                 return 1;
 116         }
 117
 118         IWL_DEBUG_HC("back from %s (0x%08X)\n",
 119                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 120
 121         /* Let iwl_tx_complete free the response skb */
 122         return 1;
 123 }
 124
 125 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 126 {
 127         int ret;
 128
 129         BUG_ON(!(cmd->meta.flags & CMD_ASYNC));
 130
 131         /* An asynchronous command can not expect an SKB to be set. */
 132         BUG_ON(cmd->meta.flags & CMD_WANT_SKB);
 133
 134         /* Assign a generic callback if one is not provided */
 135         if (!cmd->meta.u.callback)
 136                 cmd->meta.u.callback = iwl_generic_cmd_callback;
 137
 138         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 139                 return -EBUSY;
 140
 141         ret = priv->cfg->ops->utils->enqueue_hcmd(priv, cmd);
 142         if (ret < 0) {
 143                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
 144                           get_cmd_string(cmd->id), ret);
 145                 return ret;
 146         }
 147         return 0;
 148 }
 149
 150 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 151 {
 152         int cmd_idx;
 153         int ret;
 154         static atomic_t entry = ATOMIC_INIT(0); /* reentrance protection */
 155
 156         BUG_ON(cmd->meta.flags & CMD_ASYNC);
 157
 158          /* A synchronous command can not have a callback set. */
 159         BUG_ON(cmd->meta.u.callback != NULL);
 160
 161         if (atomic_xchg(&entry, 1)) {
 162                 IWL_ERROR("Error sending %s: Already sending a host command\n",
 163                           get_cmd_string(cmd->id));
 164                 return -EBUSY;
 165         }
 166
 167         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 168
 169         if (cmd->meta.flags & CMD_WANT_SKB)
 170                 cmd->meta.source = &cmd->meta;
 171
 172         cmd_idx = priv->cfg->ops->utils->enqueue_hcmd(priv, cmd);
 173         if (cmd_idx < 0) {
 174                 ret = cmd_idx;
 175                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
 176                           get_cmd_string(cmd->id), ret);
 177                 goto out;
 178         }
 179
 180         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 181                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 182                         HOST_COMPLETE_TIMEOUT);
 183         if (!ret) {
 184                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 185                         IWL_ERROR("Error sending %s: time out after %dms.\n",
 186                                   get_cmd_string(cmd->id),
 187                                   jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 188
 189                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 190                         ret = -ETIMEDOUT;
 191                         goto cancel;
 192                 }
 193         }
 194
 195         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 196                 IWL_DEBUG_INFO("Command %s aborted: RF KILL Switch\n",
 197                                get_cmd_string(cmd->id));
 198                 ret = -ECANCELED;
 199                 goto fail;
 200         }
 201         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 202                 IWL_DEBUG_INFO("Command %s failed: FW Error\n",
 203                                get_cmd_string(cmd->id));
 204                 ret = -EIO;
 205                 goto fail;
 206         }
 207         if ((cmd->meta.flags & CMD_WANT_SKB) && !cmd->meta.u.skb) {
 208                 IWL_ERROR("Error: Response NULL in '%s'\n",
 209                           get_cmd_string(cmd->id));
 210                 ret = -EIO;
 211                 goto out;
 212         }
 213
 214         ret = 0;
 215         goto out;
 216
 217 cancel:
 218         if (cmd->meta.flags & CMD_WANT_SKB) {
 219                 struct iwl_cmd *qcmd;
 220
 221                 /* Cancel the CMD_WANT_SKB flag for the cmd in the
 222                  * TX cmd queue. Otherwise in case the cmd comes
 223                  * in later, it will possibly set an invalid
 224                  * address (cmd->meta.source). */
 225                 qcmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_idx];
 226                 qcmd->meta.flags &= ~CMD_WANT_SKB;
 227         }
 228 fail:
 229         if (cmd->meta.u.skb) {
 230                 dev_kfree_skb_any(cmd->meta.u.skb);
 231                 cmd->meta.u.skb = NULL;
 232         }
 233 out:
 234         atomic_set(&entry, 0);
 235         return ret;
 236 }
 237 EXPORT_SYMBOL(iwl_send_cmd_sync);
 238
 239 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 240 {
 241         if (cmd->meta.flags & CMD_ASYNC)
 242                 return iwl_send_cmd_async(priv, cmd);
 243
 244         return iwl_send_cmd_sync(priv, cmd);
 245 }
 246 EXPORT_SYMBOL(iwl_send_cmd);
 247
 248 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
 249 {
 250         struct iwl_host_cmd cmd = {
 251                 .id = id,
 252                 .len = len,
 253                 .data = data,
 254         };
 255
 256         return iwl_send_cmd_sync(priv, &cmd);
 257 }
 258 EXPORT_SYMBOL(iwl_send_cmd_pdu);
 259
 260 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
 261                            u8 id, u16 len, const void *data,
 262                            int (*callback)(struct iwl_priv *priv,
 263                                            struct iwl_cmd *cmd,
 264                                            struct sk_buff *skb))
 265 {
 266         struct iwl_host_cmd cmd = {
 267                 .id = id,
 268                 .len = len,
 269                 .data = data,
 270         };
 271
 272         cmd.meta.flags |= CMD_ASYNC;
 273         cmd.meta.u.callback = callback;
 274
 275         return iwl_send_cmd_async(priv, &cmd);
 276 }
 277 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);