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