Merge branch 'stacktrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / 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 #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_3945_RX);
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                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
97         default:
98                 return "UNKNOWN";
99
100         }
101 }
102 EXPORT_SYMBOL(get_cmd_string);
103
104 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
105
106 static int iwl_generic_cmd_callback(struct iwl_priv *priv,
107                                     struct iwl_cmd *cmd, 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 1;
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 1;
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         /* Let iwl_tx_complete free the response skb */
138         return 1;
139 }
140
141 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
142 {
143         int ret;
144
145         BUG_ON(!(cmd->meta.flags & CMD_ASYNC));
146
147         /* An asynchronous command can not expect an SKB to be set. */
148         BUG_ON(cmd->meta.flags & CMD_WANT_SKB);
149
150         /* Assign a generic callback if one is not provided */
151         if (!cmd->meta.u.callback)
152                 cmd->meta.u.callback = iwl_generic_cmd_callback;
153
154         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
155                 return -EBUSY;
156
157         ret = iwl_enqueue_hcmd(priv, cmd);
158         if (ret < 0) {
159                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
160                           get_cmd_string(cmd->id), ret);
161                 return ret;
162         }
163         return 0;
164 }
165
166 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
167 {
168         int cmd_idx;
169         int ret;
170
171         BUG_ON(cmd->meta.flags & CMD_ASYNC);
172
173          /* A synchronous command can not have a callback set. */
174         BUG_ON(cmd->meta.u.callback != NULL);
175
176         if (test_and_set_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status)) {
177                 IWL_ERR(priv,
178                         "Error sending %s: Already sending a host command\n",
179                         get_cmd_string(cmd->id));
180                 ret = -EBUSY;
181                 goto out;
182         }
183
184         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
185
186         if (cmd->meta.flags & CMD_WANT_SKB)
187                 cmd->meta.source = &cmd->meta;
188
189         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
190         if (cmd_idx < 0) {
191                 ret = cmd_idx;
192                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
193                           get_cmd_string(cmd->id), ret);
194                 goto out;
195         }
196
197         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
198                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
199                         HOST_COMPLETE_TIMEOUT);
200         if (!ret) {
201                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
202                         IWL_ERR(priv,
203                                 "Error sending %s: time out after %dms.\n",
204                                 get_cmd_string(cmd->id),
205                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
206
207                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
208                         ret = -ETIMEDOUT;
209                         goto cancel;
210                 }
211         }
212
213         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
214                 IWL_DEBUG_INFO(priv, "Command %s aborted: RF KILL Switch\n",
215                                get_cmd_string(cmd->id));
216                 ret = -ECANCELED;
217                 goto fail;
218         }
219         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
220                 IWL_DEBUG_INFO(priv, "Command %s failed: FW Error\n",
221                                get_cmd_string(cmd->id));
222                 ret = -EIO;
223                 goto fail;
224         }
225         if ((cmd->meta.flags & CMD_WANT_SKB) && !cmd->meta.u.skb) {
226                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
227                           get_cmd_string(cmd->id));
228                 ret = -EIO;
229                 goto cancel;
230         }
231
232         ret = 0;
233         goto out;
234
235 cancel:
236         if (cmd->meta.flags & CMD_WANT_SKB) {
237                 struct iwl_cmd *qcmd;
238
239                 /* Cancel the CMD_WANT_SKB flag for the cmd in the
240                  * TX cmd queue. Otherwise in case the cmd comes
241                  * in later, it will possibly set an invalid
242                  * address (cmd->meta.source). */
243                 qcmd = priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_idx];
244                 qcmd->meta.flags &= ~CMD_WANT_SKB;
245         }
246 fail:
247         if (cmd->meta.u.skb) {
248                 dev_kfree_skb_any(cmd->meta.u.skb);
249                 cmd->meta.u.skb = NULL;
250         }
251 out:
252         clear_bit(STATUS_HCMD_SYNC_ACTIVE, &priv->status);
253         return ret;
254 }
255 EXPORT_SYMBOL(iwl_send_cmd_sync);
256
257 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
258 {
259         if (cmd->meta.flags & CMD_ASYNC)
260                 return iwl_send_cmd_async(priv, cmd);
261
262         return iwl_send_cmd_sync(priv, cmd);
263 }
264 EXPORT_SYMBOL(iwl_send_cmd);
265
266 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
267 {
268         struct iwl_host_cmd cmd = {
269                 .id = id,
270                 .len = len,
271                 .data = data,
272         };
273
274         return iwl_send_cmd_sync(priv, &cmd);
275 }
276 EXPORT_SYMBOL(iwl_send_cmd_pdu);
277
278 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
279                            u8 id, u16 len, const void *data,
280                            int (*callback)(struct iwl_priv *priv,
281                                            struct iwl_cmd *cmd,
282                                            struct sk_buff *skb))
283 {
284         struct iwl_host_cmd cmd = {
285                 .id = id,
286                 .len = len,
287                 .data = data,
288         };
289
290         cmd.meta.flags |= CMD_ASYNC;
291         cmd.meta.u.callback = callback;
292
293         return iwl_send_cmd_async(priv, &cmd);
294 }
295 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);