drivers/net/wireless/iwlwifi/iwl-op-mode.h

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63 #ifndef __iwl_op_mode_h__
  64 #define __iwl_op_mode_h__
  65
  66 #include <linux/netdevice.h>
  67 #include <linux/debugfs.h>
  68
  69 struct iwl_op_mode;
  70 struct iwl_trans;
  71 struct sk_buff;
  72 struct iwl_device_cmd;
  73 struct iwl_rx_cmd_buffer;
  74 struct iwl_fw;
  75 struct iwl_cfg;
  76
  77 /**
  78  * DOC: Operational mode - what is it ?
  79  *
  80  * The operational mode (a.k.a. op_mode) is the layer that implements
  81  * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
  82  * the transport API to access the HW. The op_mode doesn't need to know how the
  83  * underlying HW works, since the transport layer takes care of that.
  84  *
  85  * There can be several op_mode: i.e. different fw APIs will require two
  86  * different op_modes. This is why the op_mode is virtualized.
  87  */
  88
  89 /**
  90  * DOC: Life cycle of the Operational mode
  91  *
  92  * The operational mode has a very simple life cycle.
  93  *
  94  *      1) The driver layer (iwl-drv.c) chooses the op_mode based on the
  95  *         capabilities advertized by the fw file (in TLV format).
  96  *      2) The driver layer starts the op_mode (ops->start)
  97  *      3) The op_mode registers mac80211
  98  *      4) The op_mode is governed by mac80211
  99  *      5) The driver layer stops the op_mode
 100  */
 101
 102 /**
 103  * struct iwl_op_mode_ops - op_mode specific operations
 104  *
 105  * The op_mode exports its ops so that external components can start it and
 106  * interact with it. The driver layer typically calls the start and stop
 107  * handlers, the transport layer calls the others.
 108  *
 109  * All the handlers MUST be implemented
 110  *
 111  * @start: start the op_mode. The transport layer is already allocated.
 112  *      May sleep
 113  * @stop: stop the op_mode. Must free all the memory allocated.
 114  *      May sleep
 115  * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 116  *      HCMD this Rx responds to. Can't sleep.
 117  * @napi_add: NAPI initialisation. The transport is fully responsible for NAPI,
 118  *      but the higher layers need to know about it (in particular mac80211 to
 119  *      to able to call the right NAPI RX functions); this function is needed
 120  *      to eventually call netif_napi_add() with higher layer involvement.
 121  * @queue_full: notifies that a HW queue is full.
 122  *      Must be atomic and called with BH disabled.
 123  * @queue_not_full: notifies that a HW queue is not full any more.
 124  *      Must be atomic and called with BH disabled.
 125  * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 126  *      the radio is killed. Return %true if the device should be stopped by
 127  *      the transport immediately after the call. May sleep.
 128  * @free_skb: allows the transport layer to free skbs that haven't been
 129  *      reclaimed by the op_mode. This can happen when the driver is freed and
 130  *      there are Tx packets pending in the transport layer.
 131  *      Must be atomic
 132  * @nic_error: error notification. Must be atomic and must be called with BH
 133  *      disabled.
 134  * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 135  *      called with BH disabled.
 136  * @nic_config: configure NIC, called before firmware is started.
 137  *      May sleep
 138  * @wimax_active: invoked when WiMax becomes active. May sleep
 139  * @enter_d0i3: configure the fw to enter d0i3. May sleep.
 140  * @exit_d0i3: configure the fw to exit d0i3. May sleep.
 141  */
 142 struct iwl_op_mode_ops {
 143         struct iwl_op_mode *(*start)(struct iwl_trans *trans,
 144                                      const struct iwl_cfg *cfg,
 145                                      const struct iwl_fw *fw,
 146                                      struct dentry *dbgfs_dir);
 147         void (*stop)(struct iwl_op_mode *op_mode);
 148         int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
 149                   struct iwl_device_cmd *cmd);
 150         void (*napi_add)(struct iwl_op_mode *op_mode,
 151                          struct napi_struct *napi,
 152                          struct net_device *napi_dev,
 153                          int (*poll)(struct napi_struct *, int),
 154                          int weight);
 155         void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
 156         void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
 157         bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
 158         void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
 159         void (*nic_error)(struct iwl_op_mode *op_mode);
 160         void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
 161         void (*nic_config)(struct iwl_op_mode *op_mode);
 162         void (*wimax_active)(struct iwl_op_mode *op_mode);
 163         int (*enter_d0i3)(struct iwl_op_mode *op_mode);
 164         int (*exit_d0i3)(struct iwl_op_mode *op_mode);
 165 };
 166
 167 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
 168 void iwl_opmode_deregister(const char *name);
 169
 170 /**
 171  * struct iwl_op_mode - operational mode
 172  * @ops: pointer to its own ops
 173  *
 174  * This holds an implementation of the mac80211 / fw API.
 175  */
 176 struct iwl_op_mode {
 177         const struct iwl_op_mode_ops *ops;
 178
 179         char op_mode_specific[0] __aligned(sizeof(void *));
 180 };
 181
 182 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
 183 {
 184         might_sleep();
 185         op_mode->ops->stop(op_mode);
 186 }
 187
 188 static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
 189                                   struct iwl_rx_cmd_buffer *rxb,
 190                                   struct iwl_device_cmd *cmd)
 191 {
 192         return op_mode->ops->rx(op_mode, rxb, cmd);
 193 }
 194
 195 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
 196                                           int queue)
 197 {
 198         op_mode->ops->queue_full(op_mode, queue);
 199 }
 200
 201 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
 202                                               int queue)
 203 {
 204         op_mode->ops->queue_not_full(op_mode, queue);
 205 }
 206
 207 static inline bool __must_check
 208 iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state)
 209 {
 210         might_sleep();
 211         return op_mode->ops->hw_rf_kill(op_mode, state);
 212 }
 213
 214 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
 215                                         struct sk_buff *skb)
 216 {
 217         op_mode->ops->free_skb(op_mode, skb);
 218 }
 219
 220 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
 221 {
 222         op_mode->ops->nic_error(op_mode);
 223 }
 224
 225 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 226 {
 227         op_mode->ops->cmd_queue_full(op_mode);
 228 }
 229
 230 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 231 {
 232         might_sleep();
 233         op_mode->ops->nic_config(op_mode);
 234 }
 235
 236 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
 237 {
 238         might_sleep();
 239         op_mode->ops->wimax_active(op_mode);
 240 }
 241
 242 static inline int iwl_op_mode_enter_d0i3(struct iwl_op_mode *op_mode)
 243 {
 244         might_sleep();
 245
 246         if (!op_mode->ops->enter_d0i3)
 247                 return 0;
 248         return op_mode->ops->enter_d0i3(op_mode);
 249 }
 250
 251 static inline int iwl_op_mode_exit_d0i3(struct iwl_op_mode *op_mode)
 252 {
 253         might_sleep();
 254
 255         if (!op_mode->ops->exit_d0i3)
 256                 return 0;
 257         return op_mode->ops->exit_d0i3(op_mode);
 258 }
 259
 260 static inline void iwl_op_mode_napi_add(struct iwl_op_mode *op_mode,
 261                                         struct napi_struct *napi,
 262                                         struct net_device *napi_dev,
 263                                         int (*poll)(struct napi_struct *, int),
 264                                         int weight)
 265 {
 266         if (!op_mode->ops->napi_add)
 267                 return;
 268         op_mode->ops->napi_add(op_mode, napi, napi_dev, poll, weight);
 269 }
 270
 271 #endif /* __iwl_op_mode_h__ */