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

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 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 <linux/sched.h>
  32 #include <net/mac80211.h>
  33
  34 #include "iwl-dev.h" /* FIXME: remove */
  35 #include "iwl-debug.h"
  36 #include "iwl-eeprom.h"
  37 #include "iwl-core.h"
  38
  39
  40 const char *get_cmd_string(u8 cmd)
  41 {
  42         switch (cmd) {
  43                 IWL_CMD(REPLY_ALIVE);
  44                 IWL_CMD(REPLY_ERROR);
  45                 IWL_CMD(REPLY_RXON);
  46                 IWL_CMD(REPLY_RXON_ASSOC);
  47                 IWL_CMD(REPLY_QOS_PARAM);
  48                 IWL_CMD(REPLY_RXON_TIMING);
  49                 IWL_CMD(REPLY_ADD_STA);
  50                 IWL_CMD(REPLY_REMOVE_STA);
  51                 IWL_CMD(REPLY_REMOVE_ALL_STA);
  52                 IWL_CMD(REPLY_TXFIFO_FLUSH);
  53                 IWL_CMD(REPLY_WEPKEY);
  54                 IWL_CMD(REPLY_TX);
  55                 IWL_CMD(REPLY_LEDS_CMD);
  56                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
  57                 IWL_CMD(COEX_PRIORITY_TABLE_CMD);
  58                 IWL_CMD(COEX_MEDIUM_NOTIFICATION);
  59                 IWL_CMD(COEX_EVENT_CMD);
  60                 IWL_CMD(REPLY_QUIET_CMD);
  61                 IWL_CMD(REPLY_CHANNEL_SWITCH);
  62                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
  63                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
  64                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
  65                 IWL_CMD(POWER_TABLE_CMD);
  66                 IWL_CMD(PM_SLEEP_NOTIFICATION);
  67                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
  68                 IWL_CMD(REPLY_SCAN_CMD);
  69                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
  70                 IWL_CMD(SCAN_START_NOTIFICATION);
  71                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
  72                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
  73                 IWL_CMD(BEACON_NOTIFICATION);
  74                 IWL_CMD(REPLY_TX_BEACON);
  75                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
  76                 IWL_CMD(QUIET_NOTIFICATION);
  77                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
  78                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
  79                 IWL_CMD(REPLY_BT_CONFIG);
  80                 IWL_CMD(REPLY_STATISTICS_CMD);
  81                 IWL_CMD(STATISTICS_NOTIFICATION);
  82                 IWL_CMD(REPLY_CARD_STATE_CMD);
  83                 IWL_CMD(CARD_STATE_NOTIFICATION);
  84                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
  85                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
  86                 IWL_CMD(SENSITIVITY_CMD);
  87                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
  88                 IWL_CMD(REPLY_RX_PHY_CMD);
  89                 IWL_CMD(REPLY_RX_MPDU_CMD);
  90                 IWL_CMD(REPLY_RX);
  91                 IWL_CMD(REPLY_COMPRESSED_BA);
  92                 IWL_CMD(CALIBRATION_CFG_CMD);
  93                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
  94                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
  95                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
  96                 IWL_CMD(TEMPERATURE_NOTIFICATION);
  97                 IWL_CMD(TX_ANT_CONFIGURATION_CMD);
  98                 IWL_CMD(REPLY_BT_COEX_PROFILE_NOTIF);
  99                 IWL_CMD(REPLY_BT_COEX_PRIO_TABLE);
 100                 IWL_CMD(REPLY_BT_COEX_PROT_ENV);
 101                 IWL_CMD(REPLY_WIPAN_PARAMS);
 102                 IWL_CMD(REPLY_WIPAN_RXON);
 103                 IWL_CMD(REPLY_WIPAN_RXON_TIMING);
 104                 IWL_CMD(REPLY_WIPAN_RXON_ASSOC);
 105                 IWL_CMD(REPLY_WIPAN_QOS_PARAM);
 106                 IWL_CMD(REPLY_WIPAN_WEPKEY);
 107                 IWL_CMD(REPLY_WIPAN_P2P_CHANNEL_SWITCH);
 108                 IWL_CMD(REPLY_WIPAN_NOA_NOTIFICATION);
 109                 IWL_CMD(REPLY_WIPAN_DEACTIVATION_COMPLETE);
 110         default:
 111                 return "UNKNOWN";
 112
 113         }
 114 }
 115
 116 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 117
 118 static void iwl_generic_cmd_callback(struct iwl_priv *priv,
 119                                      struct iwl_device_cmd *cmd,
 120                                      struct iwl_rx_packet *pkt)
 121 {
 122         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 123                 IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
 124                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 125                 return;
 126         }
 127
 128 #ifdef CONFIG_IWLWIFI_DEBUG
 129         switch (cmd->hdr.cmd) {
 130         case REPLY_TX_LINK_QUALITY_CMD:
 131         case SENSITIVITY_CMD:
 132                 IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
 133                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 134                 break;
 135         default:
 136                 IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
 137                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 138         }
 139 #endif
 140 }
 141
 142 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 143 {
 144         int ret;
 145
 146         if (WARN_ON(!(cmd->flags & CMD_ASYNC)))
 147                 return -EINVAL;
 148
 149         /* An asynchronous command can not expect an SKB to be set. */
 150         if (WARN_ON(cmd->flags & CMD_WANT_SKB))
 151                 return -EINVAL;
 152
 153         /* Assign a generic callback if one is not provided */
 154         if (!cmd->callback)
 155                 cmd->callback = iwl_generic_cmd_callback;
 156
 157         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 158                 return -EBUSY;
 159
 160         ret = iwl_enqueue_hcmd(priv, cmd);
 161         if (ret < 0) {
 162                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 163                           get_cmd_string(cmd->id), ret);
 164                 return ret;
 165         }
 166         return 0;
 167 }
 168
 169 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 170 {
 171         int cmd_idx;
 172         int ret;
 173
 174         if (WARN_ON(cmd->flags & CMD_ASYNC))
 175                 return -EINVAL;
 176
 177          /* A synchronous command can not have a callback set. */
 178         if (WARN_ON(cmd->callback))
 179                 return -EINVAL;
 180
 181         IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 182                         get_cmd_string(cmd->id));
 183
 184         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 185         IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
 186                         get_cmd_string(cmd->id));
 187
 188         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
 189         if (cmd_idx < 0) {
 190                 ret = cmd_idx;
 191                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 192                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 193                           get_cmd_string(cmd->id), ret);
 194                 return ret;
 195         }
 196
 197         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 198                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 199                         HOST_COMPLETE_TIMEOUT);
 200         if (!ret) {
 201                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 202                         IWL_ERR(priv,
 203                                 "Error sending %s: time out after %dms.\n",
 204                                 get_cmd_string(cmd->id),
 205                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 206
 207                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 208                         IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
 209                                        get_cmd_string(cmd->id));
 210                         ret = -ETIMEDOUT;
 211                         goto cancel;
 212                 }
 213         }
 214
 215         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 216                 IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
 217                                get_cmd_string(cmd->id));
 218                 ret = -ECANCELED;
 219                 goto fail;
 220         }
 221         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 222                 IWL_ERR(priv, "Command %s failed: FW Error\n",
 223                                get_cmd_string(cmd->id));
 224                 ret = -EIO;
 225                 goto fail;
 226         }
 227         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 228                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
 229                           get_cmd_string(cmd->id));
 230                 ret = -EIO;
 231                 goto cancel;
 232         }
 233
 234         return 0;
 235
 236 cancel:
 237         if (cmd->flags & CMD_WANT_SKB) {
 238                 /*
 239                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 240                  * TX cmd queue. Otherwise in case the cmd comes
 241                  * in later, it will possibly set an invalid
 242                  * address (cmd->meta.source).
 243                  */
 244                 priv->txq[priv->cmd_queue].meta[cmd_idx].flags &=
 245                                                         ~CMD_WANT_SKB;
 246         }
 247 fail:
 248         if (cmd->reply_page) {
 249                 iwl_free_pages(priv, cmd->reply_page);
 250                 cmd->reply_page = 0;
 251         }
 252
 253         return ret;
 254 }
 255
 256 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 257 {
 258         if (cmd->flags & CMD_ASYNC)
 259                 return iwl_send_cmd_async(priv, cmd);
 260
 261         return iwl_send_cmd_sync(priv, cmd);
 262 }
 263
 264 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
 265 {
 266         struct iwl_host_cmd cmd = {
 267                 .id = id,
 268                 .len = { len, },
 269                 .data = { data, },
 270         };
 271
 272         return iwl_send_cmd_sync(priv, &cmd);
 273 }
 274
 275 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
 276                            u8 id, u16 len, const void *data,
 277                            void (*callback)(struct iwl_priv *priv,
 278                                             struct iwl_device_cmd *cmd,
 279                                             struct iwl_rx_packet *pkt))
 280 {
 281         struct iwl_host_cmd cmd = {
 282                 .id = id,
 283                 .len = { len, },
 284                 .data = { data, },
 285         };
 286
 287         cmd.flags |= CMD_ASYNC;
 288         cmd.callback = callback;
 289
 290         return iwl_send_cmd_async(priv, &cmd);
 291 }