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-dev.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_WEPKEY);
  55                 IWL_CMD(REPLY_TX);
  56                 IWL_CMD(REPLY_RATE_SCALE);
  57                 IWL_CMD(REPLY_LEDS_CMD);
  58                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
  59                 IWL_CMD(COEX_PRIORITY_TABLE_CMD);
  60                 IWL_CMD(RADAR_NOTIFICATION);
  61                 IWL_CMD(REPLY_QUIET_CMD);
  62                 IWL_CMD(REPLY_CHANNEL_SWITCH);
  63                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
  64                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
  65                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
  66                 IWL_CMD(POWER_TABLE_CMD);
  67                 IWL_CMD(PM_SLEEP_NOTIFICATION);
  68                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
  69                 IWL_CMD(REPLY_SCAN_CMD);
  70                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
  71                 IWL_CMD(SCAN_START_NOTIFICATION);
  72                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
  73                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
  74                 IWL_CMD(BEACON_NOTIFICATION);
  75                 IWL_CMD(REPLY_TX_BEACON);
  76                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
  77                 IWL_CMD(QUIET_NOTIFICATION);
  78                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
  79                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
  80                 IWL_CMD(REPLY_BT_CONFIG);
  81                 IWL_CMD(REPLY_STATISTICS_CMD);
  82                 IWL_CMD(STATISTICS_NOTIFICATION);
  83                 IWL_CMD(REPLY_CARD_STATE_CMD);
  84                 IWL_CMD(CARD_STATE_NOTIFICATION);
  85                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
  86                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
  87                 IWL_CMD(SENSITIVITY_CMD);
  88                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
  89                 IWL_CMD(REPLY_RX_PHY_CMD);
  90                 IWL_CMD(REPLY_RX_MPDU_CMD);
  91                 IWL_CMD(REPLY_RX);
  92                 IWL_CMD(REPLY_COMPRESSED_BA);
  93                 IWL_CMD(CALIBRATION_CFG_CMD);
  94                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
  95                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
  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 int iwl_generic_cmd_callback(struct iwl_priv *priv,
 106                                     struct iwl_cmd *cmd, struct sk_buff *skb)
 107 {
 108         struct iwl_rx_packet *pkt = NULL;
 109
 110         if (!skb) {
 111                 IWL_ERROR("Error: Response NULL in %s.\n",
 112                                 get_cmd_string(cmd->hdr.cmd));
 113                 return 1;
 114         }
 115
 116         pkt = (struct iwl_rx_packet *)skb->data;
 117         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 118                 IWL_ERROR("Bad return from %s (0x%08X)\n",
 119                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 120                 return 1;
 121         }
 122
 123         IWL_DEBUG_HC("back from %s (0x%08X)\n",
 124                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 125
 126         /* Let iwl_tx_complete free the response skb */
 127         return 1;
 128 }
 129
 130 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 131 {
 132         int ret;
 133
 134         BUG_ON(!(cmd->meta.flags & CMD_ASYNC));
 135
 136         /* An asynchronous command can not expect an SKB to be set. */
 137         BUG_ON(cmd->meta.flags & CMD_WANT_SKB);
 138
 139         /* Assign a generic callback if one is not provided */
 140         if (!cmd->meta.u.callback)
 141                 cmd->meta.u.callback = iwl_generic_cmd_callback;
 142
 143         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 144                 return -EBUSY;
 145
 146         ret = iwl_enqueue_hcmd(priv, cmd);
 147         if (ret < 0) {
 148                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
 149                           get_cmd_string(cmd->id), ret);
 150                 return ret;
 151         }
 152         return 0;
 153 }
 154
 155 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 156 {
 157         int cmd_idx;
 158         int ret;
 159
 160         BUG_ON(cmd->meta.flags & CMD_ASYNC);
 161
 162          /* A synchronous command can not have a callback set. */
 163         BUG_ON(cmd->meta.u.callback != NULL);
 164
 165         if (test_and_set_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status)) {
 166                 IWL_ERROR("Error sending %s: Already sending a host command\n",
 167                           get_cmd_string(cmd->id));
 168                 ret = -EBUSY;
 169                 goto out;
 170         }
 171
 172         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 173
 174         if (cmd->meta.flags & CMD_WANT_SKB)
 175                 cmd->meta.source = &cmd->meta;
 176
 177         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
 178         if (cmd_idx < 0) {
 179                 ret = cmd_idx;
 180                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
 181                           get_cmd_string(cmd->id), ret);
 182                 goto out;
 183         }
 184
 185         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 186                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 187                         HOST_COMPLETE_TIMEOUT);
 188         if (!ret) {
 189                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
 190                         IWL_ERROR("Error sending %s: time out after %dms.\n",
 191                                   get_cmd_string(cmd->id),
 192                                   jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 193
 194                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 195                         ret = -ETIMEDOUT;
 196                         goto cancel;
 197                 }
 198         }
 199
 200         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
 201                 IWL_DEBUG_INFO("Command %s aborted: RF KILL Switch\n",
 202                                get_cmd_string(cmd->id));
 203                 ret = -ECANCELED;
 204                 goto fail;
 205         }
 206         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
 207                 IWL_DEBUG_INFO("Command %s failed: FW Error\n",
 208                                get_cmd_string(cmd->id));
 209                 ret = -EIO;
 210                 goto fail;
 211         }
 212         if ((cmd->meta.flags & CMD_WANT_SKB) && !cmd->meta.u.skb) {
 213                 IWL_ERROR("Error: Response NULL in '%s'\n",
 214                           get_cmd_string(cmd->id));
 215                 ret = -EIO;
 216                 goto out;
 217         }
 218
 219         ret = 0;
 220         goto out;
 221
 222 cancel:
 223         if (cmd->meta.flags & CMD_WANT_SKB) {
 224                 struct iwl_cmd *qcmd;
 225
 226                 /* Cancel the CMD_WANT_SKB flag for the cmd in the
 227                  * TX cmd queue. Otherwise in case the cmd comes
 228                  * in later, it will possibly set an invalid
 229                  * address (cmd->meta.source). */
 230                 qcmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_idx];
 231                 qcmd->meta.flags &= ~CMD_WANT_SKB;
 232         }
 233 fail:
 234         if (cmd->meta.u.skb) {
 235                 dev_kfree_skb_any(cmd->meta.u.skb);
 236                 cmd->meta.u.skb = NULL;
 237         }
 238 out:
 239         clear_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status);
 240         return ret;
 241 }
 242 EXPORT_SYMBOL(iwl_send_cmd_sync);
 243
 244 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 245 {
 246         if (cmd->meta.flags & CMD_ASYNC)
 247                 return iwl_send_cmd_async(priv, cmd);
 248
 249         return iwl_send_cmd_sync(priv, cmd);
 250 }
 251 EXPORT_SYMBOL(iwl_send_cmd);
 252
 253 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
 254 {
 255         struct iwl_host_cmd cmd = {
 256                 .id = id,
 257                 .len = len,
 258                 .data = data,
 259         };
 260
 261         return iwl_send_cmd_sync(priv, &cmd);
 262 }
 263 EXPORT_SYMBOL(iwl_send_cmd_pdu);
 264
 265 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
 266                            u8 id, u16 len, const void *data,
 267                            int (*callback)(struct iwl_priv *priv,
 268                                            struct iwl_cmd *cmd,
 269                                            struct sk_buff *skb))
 270 {
 271         struct iwl_host_cmd cmd = {
 272                 .id = id,
 273                 .len = len,
 274                 .data = data,
 275         };
 276
 277         cmd.meta.flags |= CMD_ASYNC;
 278         cmd.meta.u.callback = callback;
 279
 280         return iwl_send_cmd_async(priv, &cmd);
 281 }
 282 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);