drivers/net/wireless/iwlegacy/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"
  35 #include "iwl-debug.h"
  36 #include "iwl-eeprom.h"
  37 #include "iwl-core.h"
  38
  39
  40 const char *iwl_legacy_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_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(REPLY_CHANNEL_SWITCH);
  58                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
  59                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
  60                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
  61                 IWL_CMD(POWER_TABLE_CMD);
  62                 IWL_CMD(PM_SLEEP_NOTIFICATION);
  63                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
  64                 IWL_CMD(REPLY_SCAN_CMD);
  65                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
  66                 IWL_CMD(SCAN_START_NOTIFICATION);
  67                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
  68                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
  69                 IWL_CMD(BEACON_NOTIFICATION);
  70                 IWL_CMD(REPLY_TX_BEACON);
  71                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
  72                 IWL_CMD(REPLY_BT_CONFIG);
  73                 IWL_CMD(REPLY_STATISTICS_CMD);
  74                 IWL_CMD(STATISTICS_NOTIFICATION);
  75                 IWL_CMD(CARD_STATE_NOTIFICATION);
  76                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
  77                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
  78                 IWL_CMD(SENSITIVITY_CMD);
  79                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
  80                 IWL_CMD(REPLY_RX_PHY_CMD);
  81                 IWL_CMD(REPLY_RX_MPDU_CMD);
  82                 IWL_CMD(REPLY_RX);
  83                 IWL_CMD(REPLY_COMPRESSED_BA);
  84         default:
  85                 return "UNKNOWN";
  86
  87         }
  88 }
  89 EXPORT_SYMBOL(iwl_legacy_get_cmd_string);
  90
  91 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
  92
  93 static void iwl_legacy_generic_cmd_callback(struct iwl_priv *priv,
  94                                      struct iwl_device_cmd *cmd,
  95                                      struct iwl_rx_packet *pkt)
  96 {
  97         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  98                 IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
  99                 iwl_legacy_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 100                 return;
 101         }
 102
 103 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
 104         switch (cmd->hdr.cmd) {
 105         case REPLY_TX_LINK_QUALITY_CMD:
 106         case SENSITIVITY_CMD:
 107                 IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
 108                 iwl_legacy_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 109                 break;
 110         default:
 111                 IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
 112                 iwl_legacy_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 113         }
 114 #endif
 115 }
 116
 117 static int
 118 iwl_legacy_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 119 {
 120         int ret;
 121
 122         BUG_ON(!(cmd->flags & CMD_ASYNC));
 123
 124         /* An asynchronous command can not expect an SKB to be set. */
 125         BUG_ON(cmd->flags & CMD_WANT_SKB);
 126
 127         /* Assign a generic callback if one is not provided */
 128         if (!cmd->callback)
 129                 cmd->callback = iwl_legacy_generic_cmd_callback;
 130
 131         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 132                 return -EBUSY;
 133
 134         ret = iwl_legacy_enqueue_hcmd(priv, cmd);
 135         if (ret < 0) {
 136                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 137                           iwl_legacy_get_cmd_string(cmd->id), ret);
 138                 return ret;
 139         }
 140         return 0;
 141 }
 142
 143 int iwl_legacy_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 144 {
 145         int cmd_idx;
 146         int ret;
 147
 148         lockdep_assert_held(&priv->mutex);
 149
 150         BUG_ON(cmd->flags & CMD_ASYNC);
 151
 152          /* A synchronous command can not have a callback set. */
 153         BUG_ON(cmd->callback);
 154
 155         IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 156                         iwl_legacy_get_cmd_string(cmd->id));
 157
 158         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 159         IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
 160                         iwl_legacy_get_cmd_string(cmd->id));
 161
 162         cmd_idx = iwl_legacy_enqueue_hcmd(priv, cmd);
 163         if (cmd_idx < 0) {
 164                 ret = cmd_idx;
 165                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 166                           iwl_legacy_get_cmd_string(cmd->id), ret);
 167                 goto out;
 168         }
 169
 170         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 171                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 172                         HOST_COMPLETE_TIMEOUT);
 173         if (!ret) {
 174                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 175                         IWL_ERR(priv,
 176                                 "Error sending %s: time out after %dms.\n",
 177                                 iwl_legacy_get_cmd_string(cmd->id),
 178                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 179
 180                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 181                         IWL_DEBUG_INFO(priv,
 182                                 "Clearing HCMD_ACTIVE for command %s\n",
 183                                        iwl_legacy_get_cmd_string(cmd->id));
 184                         ret = -ETIMEDOUT;
 185                         goto cancel;
 186                 }
 187         }
 188
 189         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 190                 IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
 191                                iwl_legacy_get_cmd_string(cmd->id));
 192                 ret = -ECANCELED;
 193                 goto fail;
 194         }
 195         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 196                 IWL_ERR(priv, "Command %s failed: FW Error\n",
 197                                iwl_legacy_get_cmd_string(cmd->id));
 198                 ret = -EIO;
 199                 goto fail;
 200         }
 201         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 202                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
 203                           iwl_legacy_get_cmd_string(cmd->id));
 204                 ret = -EIO;
 205                 goto cancel;
 206         }
 207
 208         ret = 0;
 209         goto out;
 210
 211 cancel:
 212         if (cmd->flags & CMD_WANT_SKB) {
 213                 /*
 214                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 215                  * TX cmd queue. Otherwise in case the cmd comes
 216                  * in later, it will possibly set an invalid
 217                  * address (cmd->meta.source).
 218                  */
 219                 priv->txq[priv->cmd_queue].meta[cmd_idx].flags &=
 220                                                         ~CMD_WANT_SKB;
 221         }
 222 fail:
 223         if (cmd->reply_page) {
 224                 iwl_legacy_free_pages(priv, cmd->reply_page);
 225                 cmd->reply_page = 0;
 226         }
 227 out:
 228         return ret;
 229 }
 230 EXPORT_SYMBOL(iwl_legacy_send_cmd_sync);
 231
 232 int iwl_legacy_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 233 {
 234         if (cmd->flags & CMD_ASYNC)
 235                 return iwl_legacy_send_cmd_async(priv, cmd);
 236
 237         return iwl_legacy_send_cmd_sync(priv, cmd);
 238 }
 239 EXPORT_SYMBOL(iwl_legacy_send_cmd);
 240
 241 int
 242 iwl_legacy_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
 243 {
 244         struct iwl_host_cmd cmd = {
 245                 .id = id,
 246                 .len = len,
 247                 .data = data,
 248         };
 249
 250         return iwl_legacy_send_cmd_sync(priv, &cmd);
 251 }
 252 EXPORT_SYMBOL(iwl_legacy_send_cmd_pdu);
 253
 254 int iwl_legacy_send_cmd_pdu_async(struct iwl_priv *priv,
 255                            u8 id, u16 len, const void *data,
 256                            void (*callback)(struct iwl_priv *priv,
 257                                             struct iwl_device_cmd *cmd,
 258                                             struct iwl_rx_packet *pkt))
 259 {
 260         struct iwl_host_cmd cmd = {
 261                 .id = id,
 262                 .len = len,
 263                 .data = data,
 264         };
 265
 266         cmd.flags |= CMD_ASYNC;
 267         cmd.callback = callback;
 268
 269         return iwl_legacy_send_cmd_async(priv, &cmd);
 270 }
 271 EXPORT_SYMBOL(iwl_legacy_send_cmd_pdu_async);