Merge branch 'x86/header-guards' into x86-v28-for-linus-phase1
[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         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);