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

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2009 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  *  Intel Linux Wireless <ilw@linux.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 <net/mac80211.h>
  32
  33 #include "iwl-dev.h" /* FIXME: remove */
  34 #include "iwl-debug.h"
  35 #include "iwl-eeprom.h"
  36 #include "iwl-core.h"
  37
  38
  39 const char *get_cmd_string(u8 cmd)
  40 {
  41         switch (cmd) {
  42                 IWL_CMD(REPLY_ALIVE);
  43                 IWL_CMD(REPLY_ERROR);
  44                 IWL_CMD(REPLY_RXON);
  45                 IWL_CMD(REPLY_RXON_ASSOC);
  46                 IWL_CMD(REPLY_QOS_PARAM);
  47                 IWL_CMD(REPLY_RXON_TIMING);
  48                 IWL_CMD(REPLY_ADD_STA);
  49                 IWL_CMD(REPLY_REMOVE_STA);
  50                 IWL_CMD(REPLY_REMOVE_ALL_STA);
  51                 IWL_CMD(REPLY_WEPKEY);
  52                 IWL_CMD(REPLY_3945_RX);
  53                 IWL_CMD(REPLY_TX);
  54                 IWL_CMD(REPLY_RATE_SCALE);
  55                 IWL_CMD(REPLY_LEDS_CMD);
  56                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
  57                 IWL_CMD(COEX_PRIORITY_TABLE_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                 IWL_CMD(CALIBRATION_CFG_CMD);
  92                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
  93                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
  94                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
  95         default:
  96                 return "UNKNOWN";
  97
  98         }
  99 }
 100 EXPORT_SYMBOL(get_cmd_string);
 101
 102 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 103
 104 static void iwl_generic_cmd_callback(struct iwl_priv *priv,
 105                                      struct iwl_device_cmd *cmd,
 106                                      struct sk_buff *skb)
 107 {
 108         struct iwl_rx_packet *pkt = NULL;
 109
 110         if (!skb) {
 111                 IWL_ERR(priv, "Error: Response NULL in %s.\n",
 112                                 get_cmd_string(cmd->hdr.cmd));
 113                 return;
 114         }
 115
 116         pkt = (struct iwl_rx_packet *)skb->data;
 117         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 118                 IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
 119                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 120                 return;
 121         }
 122
 123 #ifdef CONFIG_IWLWIFI_DEBUG
 124         switch (cmd->hdr.cmd) {
 125         case REPLY_TX_LINK_QUALITY_CMD:
 126         case SENSITIVITY_CMD:
 127                 IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
 128                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 129                 break;
 130         default:
 131                 IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
 132                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 133         }
 134 #endif
 135 }
 136
 137 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 138 {
 139         int ret;
 140
 141         BUG_ON(!(cmd->flags & CMD_ASYNC));
 142
 143         /* An asynchronous command can not expect an SKB to be set. */
 144         BUG_ON(cmd->flags & CMD_WANT_SKB);
 145
 146         /* Assign a generic callback if one is not provided */
 147         if (!cmd->callback)
 148                 cmd->callback = iwl_generic_cmd_callback;
 149
 150         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 151                 return -EBUSY;
 152
 153         ret = iwl_enqueue_hcmd(priv, cmd);
 154         if (ret < 0) {
 155                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 156                           get_cmd_string(cmd->id), ret);
 157                 return ret;
 158         }
 159         return 0;
 160 }
 161
 162 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 163 {
 164         int cmd_idx;
 165         int ret;
 166
 167         BUG_ON(cmd->flags & CMD_ASYNC);
 168
 169          /* A synchronous command can not have a callback set. */
 170         BUG_ON(cmd->callback);
 171
 172         if (test_and_set_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status)) {
 173                 IWL_ERR(priv,
 174                         "Error sending %s: Already sending a host command\n",
 175                         get_cmd_string(cmd->id));
 176                 ret = -EBUSY;
 177                 goto out;
 178         }
 179
 180         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 181
 182         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
 183         if (cmd_idx < 0) {
 184                 ret = cmd_idx;
 185                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 186                           get_cmd_string(cmd->id), ret);
 187                 goto out;
 188         }
 189
 190         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 191                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 192                         HOST_COMPLETE_TIMEOUT);
 193         if (!ret) {
 194                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 195                         IWL_ERR(priv,
 196                                 "Error sending %s: time out after %dms.\n",
 197                                 get_cmd_string(cmd->id),
 198                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 199
 200                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 201                         ret = -ETIMEDOUT;
 202                         goto cancel;
 203                 }
 204         }
 205
 206         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 207                 IWL_DEBUG_INFO(priv, "Command %s aborted: RF KILL Switch\n",
 208                                get_cmd_string(cmd->id));
 209                 ret = -ECANCELED;
 210                 goto fail;
 211         }
 212         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 213                 IWL_DEBUG_INFO(priv, "Command %s failed: FW Error\n",
 214                                get_cmd_string(cmd->id));
 215                 ret = -EIO;
 216                 goto fail;
 217         }
 218         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_skb) {
 219                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
 220                           get_cmd_string(cmd->id));
 221                 ret = -EIO;
 222                 goto cancel;
 223         }
 224
 225         ret = 0;
 226         goto out;
 227
 228 cancel:
 229         if (cmd->flags & CMD_WANT_SKB) {
 230                 /*
 231                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 232                  * TX cmd queue. Otherwise in case the cmd comes
 233                  * in later, it will possibly set an invalid
 234                  * address (cmd->meta.source).
 235                  */
 236                 priv->txq[IWL_CMD_QUEUE_NUM].meta[cmd_idx].flags &=
 237                                                         ~CMD_WANT_SKB;
 238         }
 239 fail:
 240         if (cmd->reply_skb) {
 241                 dev_kfree_skb_any(cmd->reply_skb);
 242                 cmd->reply_skb = NULL;
 243         }
 244 out:
 245         clear_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status);
 246         return ret;
 247 }
 248 EXPORT_SYMBOL(iwl_send_cmd_sync);
 249
 250 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 251 {
 252         if (cmd->flags & CMD_ASYNC)
 253                 return iwl_send_cmd_async(priv, cmd);
 254
 255         return iwl_send_cmd_sync(priv, cmd);
 256 }
 257 EXPORT_SYMBOL(iwl_send_cmd);
 258
 259 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
 260 {
 261         struct iwl_host_cmd cmd = {
 262                 .id = id,
 263                 .len = len,
 264                 .data = data,
 265         };
 266
 267         return iwl_send_cmd_sync(priv, &cmd);
 268 }
 269 EXPORT_SYMBOL(iwl_send_cmd_pdu);
 270
 271 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
 272                            u8 id, u16 len, const void *data,
 273                            void (*callback)(struct iwl_priv *priv,
 274                                             struct iwl_device_cmd *cmd,
 275                                             struct sk_buff *skb))
 276 {
 277         struct iwl_host_cmd cmd = {
 278                 .id = id,
 279                 .len = len,
 280                 .data = data,
 281         };
 282
 283         cmd.flags |= CMD_ASYNC;
 284         cmd.callback = callback;
 285
 286         return iwl_send_cmd_async(priv, &cmd);
 287 }
 288 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);