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