Merge branch 'linus' into oprofile
[linux-2.6] / 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 <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 #define IWL_CMD(x) case x : return #x
40
41 const char *get_cmd_string(u8 cmd)
42 {
43         switch (cmd) {
44                 IWL_CMD(REPLY_ALIVE);
45                 IWL_CMD(REPLY_ERROR);
46                 IWL_CMD(REPLY_RXON);
47                 IWL_CMD(REPLY_RXON_ASSOC);
48                 IWL_CMD(REPLY_QOS_PARAM);
49                 IWL_CMD(REPLY_RXON_TIMING);
50                 IWL_CMD(REPLY_ADD_STA);
51                 IWL_CMD(REPLY_REMOVE_STA);
52                 IWL_CMD(REPLY_REMOVE_ALL_STA);
53                 IWL_CMD(REPLY_WEPKEY);
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 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 #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("back from %s (0x%08X)\n",
128                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
129                                 break;
130         default:
131                 IWL_DEBUG_HC("back from %s (0x%08X)\n",
132                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
133         }
134 #endif
135
136         /* Let iwl_tx_complete free the response skb */
137         return 1;
138 }
139
140 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
141 {
142         int ret;
143
144         BUG_ON(!(cmd->meta.flags & CMD_ASYNC));
145
146         /* An asynchronous command can not expect an SKB to be set. */
147         BUG_ON(cmd->meta.flags & CMD_WANT_SKB);
148
149         /* Assign a generic callback if one is not provided */
150         if (!cmd->meta.u.callback)
151                 cmd->meta.u.callback = iwl_generic_cmd_callback;
152
153         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
154                 return -EBUSY;
155
156         ret = iwl_enqueue_hcmd(priv, cmd);
157         if (ret < 0) {
158                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
159                           get_cmd_string(cmd->id), ret);
160                 return ret;
161         }
162         return 0;
163 }
164
165 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
166 {
167         int cmd_idx;
168         int ret;
169
170         BUG_ON(cmd->meta.flags & CMD_ASYNC);
171
172          /* A synchronous command can not have a callback set. */
173         BUG_ON(cmd->meta.u.callback != NULL);
174
175         if (test_and_set_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status)) {
176                 IWL_ERROR("Error sending %s: Already sending a host command\n",
177                           get_cmd_string(cmd->id));
178                 ret = -EBUSY;
179                 goto out;
180         }
181
182         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
183
184         if (cmd->meta.flags & CMD_WANT_SKB)
185                 cmd->meta.source = &cmd->meta;
186
187         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
188         if (cmd_idx < 0) {
189                 ret = cmd_idx;
190                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
191                           get_cmd_string(cmd->id), ret);
192                 goto out;
193         }
194
195         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
196                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
197                         HOST_COMPLETE_TIMEOUT);
198         if (!ret) {
199                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
200                         IWL_ERROR("Error sending %s: time out after %dms.\n",
201                                   get_cmd_string(cmd->id),
202                                   jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
203
204                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
205                         ret = -ETIMEDOUT;
206                         goto cancel;
207                 }
208         }
209
210         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
211                 IWL_DEBUG_INFO("Command %s aborted: RF KILL Switch\n",
212                                get_cmd_string(cmd->id));
213                 ret = -ECANCELED;
214                 goto fail;
215         }
216         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
217                 IWL_DEBUG_INFO("Command %s failed: FW Error\n",
218                                get_cmd_string(cmd->id));
219                 ret = -EIO;
220                 goto fail;
221         }
222         if ((cmd->meta.flags & CMD_WANT_SKB) && !cmd->meta.u.skb) {
223                 IWL_ERROR("Error: Response NULL in '%s'\n",
224                           get_cmd_string(cmd->id));
225                 ret = -EIO;
226                 goto out;
227         }
228
229         ret = 0;
230         goto out;
231
232 cancel:
233         if (cmd->meta.flags & CMD_WANT_SKB) {
234                 struct iwl_cmd *qcmd;
235
236                 /* Cancel the CMD_WANT_SKB flag for the cmd in the
237                  * TX cmd queue. Otherwise in case the cmd comes
238                  * in later, it will possibly set an invalid
239                  * address (cmd->meta.source). */
240                 qcmd = priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_idx];
241                 qcmd->meta.flags &= ~CMD_WANT_SKB;
242         }
243 fail:
244         if (cmd->meta.u.skb) {
245                 dev_kfree_skb_any(cmd->meta.u.skb);
246                 cmd->meta.u.skb = NULL;
247         }
248 out:
249         clear_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status);
250         return ret;
251 }
252 EXPORT_SYMBOL(iwl_send_cmd_sync);
253
254 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
255 {
256         if (cmd->meta.flags & CMD_ASYNC)
257                 return iwl_send_cmd_async(priv, cmd);
258
259         return iwl_send_cmd_sync(priv, cmd);
260 }
261 EXPORT_SYMBOL(iwl_send_cmd);
262
263 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
264 {
265         struct iwl_host_cmd cmd = {
266                 .id = id,
267                 .len = len,
268                 .data = data,
269         };
270
271         return iwl_send_cmd_sync(priv, &cmd);
272 }
273 EXPORT_SYMBOL(iwl_send_cmd_pdu);
274
275 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
276                            u8 id, u16 len, const void *data,
277                            int (*callback)(struct iwl_priv *priv,
278                                            struct iwl_cmd *cmd,
279                                            struct sk_buff *skb))
280 {
281         struct iwl_host_cmd cmd = {
282                 .id = id,
283                 .len = len,
284                 .data = data,
285         };
286
287         cmd.meta.flags |= CMD_ASYNC;
288         cmd.meta.u.callback = callback;
289
290         return iwl_send_cmd_async(priv, &cmd);
291 }
292 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);