532c8d6cd8daffedbd3816e4bc51592c9c92ce44
[linux-2.6.git] / 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);