iwlwifi: add notification infrastructure to iwlcore
[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 <linux/version.h>
32 #include <net/mac80211.h>
33
34 #include "iwl-4965.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_TX);
55                 IWL_CMD(REPLY_RATE_SCALE);
56                 IWL_CMD(REPLY_LEDS_CMD);
57                 IWL_CMD(REPLY_TX_LINK_QUALITY_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         default:
92                 return "UNKNOWN";
93
94         }
95 }
96 EXPORT_SYMBOL(get_cmd_string);
97
98 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
99
100 static int iwl_generic_cmd_callback(struct iwl_priv *priv,
101                                     struct iwl_cmd *cmd, struct sk_buff *skb)
102 {
103         struct iwl4965_rx_packet *pkt = NULL;
104
105         if (!skb) {
106                 IWL_ERROR("Error: Response NULL in %s.\n",
107                                 get_cmd_string(cmd->hdr.cmd));
108                 return 1;
109         }
110
111         pkt = (struct iwl4965_rx_packet *)skb->data;
112         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
113                 IWL_ERROR("Bad return from %s (0x%08X)\n",
114                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
115                 return 1;
116         }
117
118         IWL_DEBUG_HC("back from %s (0x%08X)\n",
119                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
120
121         /* Let iwl_tx_complete free the response skb */
122         return 1;
123 }
124
125 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
126 {
127         int ret;
128
129         BUG_ON(!(cmd->meta.flags & CMD_ASYNC));
130
131         /* An asynchronous command can not expect an SKB to be set. */
132         BUG_ON(cmd->meta.flags & CMD_WANT_SKB);
133
134         /* Assign a generic callback if one is not provided */
135         if (!cmd->meta.u.callback)
136                 cmd->meta.u.callback = iwl_generic_cmd_callback;
137
138         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
139                 return -EBUSY;
140
141         ret = priv->cfg->ops->utils->enqueue_hcmd(priv, cmd);
142         if (ret < 0) {
143                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
144                           get_cmd_string(cmd->id), ret);
145                 return ret;
146         }
147         return 0;
148 }
149
150 int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
151 {
152         int cmd_idx;
153         int ret;
154         static atomic_t entry = ATOMIC_INIT(0); /* reentrance protection */
155
156         BUG_ON(cmd->meta.flags & CMD_ASYNC);
157
158          /* A synchronous command can not have a callback set. */
159         BUG_ON(cmd->meta.u.callback != NULL);
160
161         if (atomic_xchg(&entry, 1)) {
162                 IWL_ERROR("Error sending %s: Already sending a host command\n",
163                           get_cmd_string(cmd->id));
164                 return -EBUSY;
165         }
166
167         set_bit(STATUS_HCMD_ACTIVE, &priv->status);
168
169         if (cmd->meta.flags & CMD_WANT_SKB)
170                 cmd->meta.source = &cmd->meta;
171
172         cmd_idx = priv->cfg->ops->utils->enqueue_hcmd(priv, cmd);
173         if (cmd_idx < 0) {
174                 ret = cmd_idx;
175                 IWL_ERROR("Error sending %s: enqueue_hcmd failed: %d\n",
176                           get_cmd_string(cmd->id), ret);
177                 goto out;
178         }
179
180         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
181                         !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
182                         HOST_COMPLETE_TIMEOUT);
183         if (!ret) {
184                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->status)) {
185                         IWL_ERROR("Error sending %s: time out after %dms.\n",
186                                   get_cmd_string(cmd->id),
187                                   jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
188
189                         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
190                         ret = -ETIMEDOUT;
191                         goto cancel;
192                 }
193         }
194
195         if (test_bit(STATUS_RF_KILL_HW, &priv->status)) {
196                 IWL_DEBUG_INFO("Command %s aborted: RF KILL Switch\n",
197                                get_cmd_string(cmd->id));
198                 ret = -ECANCELED;
199                 goto fail;
200         }
201         if (test_bit(STATUS_FW_ERROR, &priv->status)) {
202                 IWL_DEBUG_INFO("Command %s failed: FW Error\n",
203                                get_cmd_string(cmd->id));
204                 ret = -EIO;
205                 goto fail;
206         }
207         if ((cmd->meta.flags & CMD_WANT_SKB) && !cmd->meta.u.skb) {
208                 IWL_ERROR("Error: Response NULL in '%s'\n",
209                           get_cmd_string(cmd->id));
210                 ret = -EIO;
211                 goto out;
212         }
213
214         ret = 0;
215         goto out;
216
217 cancel:
218         if (cmd->meta.flags & CMD_WANT_SKB) {
219                 struct iwl_cmd *qcmd;
220
221                 /* Cancel the CMD_WANT_SKB flag for the cmd in the
222                  * TX cmd queue. Otherwise in case the cmd comes
223                  * in later, it will possibly set an invalid
224                  * address (cmd->meta.source). */
225                 qcmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_idx];
226                 qcmd->meta.flags &= ~CMD_WANT_SKB;
227         }
228 fail:
229         if (cmd->meta.u.skb) {
230                 dev_kfree_skb_any(cmd->meta.u.skb);
231                 cmd->meta.u.skb = NULL;
232         }
233 out:
234         atomic_set(&entry, 0);
235         return ret;
236 }
237 EXPORT_SYMBOL(iwl_send_cmd_sync);
238
239 int iwl_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
240 {
241         if (cmd->meta.flags & CMD_ASYNC)
242                 return iwl_send_cmd_async(priv, cmd);
243
244         return iwl_send_cmd_sync(priv, cmd);
245 }
246 EXPORT_SYMBOL(iwl_send_cmd);
247
248 int iwl_send_cmd_pdu(struct iwl_priv *priv, u8 id, u16 len, const void *data)
249 {
250         struct iwl_host_cmd cmd = {
251                 .id = id,
252                 .len = len,
253                 .data = data,
254         };
255
256         return iwl_send_cmd_sync(priv, &cmd);
257 }
258 EXPORT_SYMBOL(iwl_send_cmd_pdu);
259
260 int iwl_send_cmd_pdu_async(struct iwl_priv *priv,
261                            u8 id, u16 len, const void *data,
262                            int (*callback)(struct iwl_priv *priv,
263                                            struct iwl_cmd *cmd,
264                                            struct sk_buff *skb))
265 {
266         struct iwl_host_cmd cmd = {
267                 .id = id,
268                 .len = len,
269                 .data = data,
270         };
271
272         cmd.meta.flags |= CMD_ASYNC;
273         cmd.meta.u.callback = callback;
274
275         return iwl_send_cmd_async(priv, &cmd);
276 }
277 EXPORT_SYMBOL(iwl_send_cmd_pdu_async);