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

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  65 #ifndef __iwl_op_mode_h__
  66 #define __iwl_op_mode_h__
  67
  68 #include <linux/netdevice.h>
  69 #include <linux/debugfs.h>
  70
  71 struct iwl_op_mode;
  72 struct iwl_trans;
  73 struct sk_buff;
  74 struct iwl_device_cmd;
  75 struct iwl_rx_cmd_buffer;
  76 struct iwl_fw;
  77 struct iwl_cfg;
  78
  79 /**
  80  * DOC: Operational mode - what is it ?
  81  *
  82  * The operational mode (a.k.a. op_mode) is the layer that implements
  83  * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
  84  * the transport API to access the HW. The op_mode doesn't need to know how the
  85  * underlying HW works, since the transport layer takes care of that.
  86  *
  87  * There can be several op_mode: i.e. different fw APIs will require two
  88  * different op_modes. This is why the op_mode is virtualized.
  89  */
  90
  91 /**
  92  * DOC: Life cycle of the Operational mode
  93  *
  94  * The operational mode has a very simple life cycle.
  95  *
  96  *      1) The driver layer (iwl-drv.c) chooses the op_mode based on the
  97  *         capabilities advertized by the fw file (in TLV format).
  98  *      2) The driver layer starts the op_mode (ops->start)
  99  *      3) The op_mode registers mac80211
 100  *      4) The op_mode is governed by mac80211
 101  *      5) The driver layer stops the op_mode
 102  */
 103
 104 /**
 105  * struct iwl_op_mode_ops - op_mode specific operations
 106  *
 107  * The op_mode exports its ops so that external components can start it and
 108  * interact with it. The driver layer typically calls the start and stop
 109  * handlers, the transport layer calls the others.
 110  *
 111  * All the handlers MUST be implemented
 112  *
 113  * @start: start the op_mode. The transport layer is already allocated.
 114  *      May sleep
 115  * @stop: stop the op_mode. Must free all the memory allocated.
 116  *      May sleep
 117  * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 118  *      HCMD this Rx responds to. Can't sleep.
 119  * @napi_add: NAPI initialisation. The transport is fully responsible for NAPI,
 120  *      but the higher layers need to know about it (in particular mac80211 to
 121  *      to able to call the right NAPI RX functions); this function is needed
 122  *      to eventually call netif_napi_add() with higher layer involvement.
 123  * @queue_full: notifies that a HW queue is full.
 124  *      Must be atomic and called with BH disabled.
 125  * @queue_not_full: notifies that a HW queue is not full any more.
 126  *      Must be atomic and called with BH disabled.
 127  * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 128  *      the radio is killed. Return %true if the device should be stopped by
 129  *      the transport immediately after the call. May sleep.
 130  * @free_skb: allows the transport layer to free skbs that haven't been
 131  *      reclaimed by the op_mode. This can happen when the driver is freed and
 132  *      there are Tx packets pending in the transport layer.
 133  *      Must be atomic
 134  * @nic_error: error notification. Must be atomic and must be called with BH
 135  *      disabled.
 136  * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 137  *      called with BH disabled.
 138  * @nic_config: configure NIC, called before firmware is started.
 139  *      May sleep
 140  * @wimax_active: invoked when WiMax becomes active. May sleep
 141  * @enter_d0i3: configure the fw to enter d0i3. return 1 to indicate d0i3
 142  *      entrance is aborted (e.g. due to held reference). May sleep.
 143  * @exit_d0i3: configure the fw to exit d0i3. May sleep.
 144  */
 145 struct iwl_op_mode_ops {
 146         struct iwl_op_mode *(*start)(struct iwl_trans *trans,
 147                                      const struct iwl_cfg *cfg,
 148                                      const struct iwl_fw *fw,
 149                                      struct dentry *dbgfs_dir);
 150         void (*stop)(struct iwl_op_mode *op_mode);
 151         int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
 152                   struct iwl_device_cmd *cmd);
 153         void (*napi_add)(struct iwl_op_mode *op_mode,
 154                          struct napi_struct *napi,
 155                          struct net_device *napi_dev,
 156                          int (*poll)(struct napi_struct *, int),
 157                          int weight);
 158         void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
 159         void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
 160         bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
 161         void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
 162         void (*nic_error)(struct iwl_op_mode *op_mode);
 163         void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
 164         void (*nic_config)(struct iwl_op_mode *op_mode);
 165         void (*wimax_active)(struct iwl_op_mode *op_mode);
 166         int (*enter_d0i3)(struct iwl_op_mode *op_mode);
 167         int (*exit_d0i3)(struct iwl_op_mode *op_mode);
 168 };
 169
 170 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
 171 void iwl_opmode_deregister(const char *name);
 172
 173 /**
 174  * struct iwl_op_mode - operational mode
 175  * @ops: pointer to its own ops
 176  *
 177  * This holds an implementation of the mac80211 / fw API.
 178  */
 179 struct iwl_op_mode {
 180         const struct iwl_op_mode_ops *ops;
 181
 182         char op_mode_specific[0] __aligned(sizeof(void *));
 183 };
 184
 185 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
 186 {
 187         might_sleep();
 188         op_mode->ops->stop(op_mode);
 189 }
 190
 191 static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
 192                                   struct iwl_rx_cmd_buffer *rxb,
 193                                   struct iwl_device_cmd *cmd)
 194 {
 195         return op_mode->ops->rx(op_mode, rxb, cmd);
 196 }
 197
 198 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
 199                                           int queue)
 200 {
 201         op_mode->ops->queue_full(op_mode, queue);
 202 }
 203
 204 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
 205                                               int queue)
 206 {
 207         op_mode->ops->queue_not_full(op_mode, queue);
 208 }
 209
 210 static inline bool __must_check
 211 iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state)
 212 {
 213         might_sleep();
 214         return op_mode->ops->hw_rf_kill(op_mode, state);
 215 }
 216
 217 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
 218                                         struct sk_buff *skb)
 219 {
 220         op_mode->ops->free_skb(op_mode, skb);
 221 }
 222
 223 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
 224 {
 225         op_mode->ops->nic_error(op_mode);
 226 }
 227
 228 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 229 {
 230         op_mode->ops->cmd_queue_full(op_mode);
 231 }
 232
 233 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 234 {
 235         might_sleep();
 236         op_mode->ops->nic_config(op_mode);
 237 }
 238
 239 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
 240 {
 241         might_sleep();
 242         op_mode->ops->wimax_active(op_mode);
 243 }
 244
 245 static inline int iwl_op_mode_enter_d0i3(struct iwl_op_mode *op_mode)
 246 {
 247         might_sleep();
 248
 249         if (!op_mode->ops->enter_d0i3)
 250                 return 0;
 251         return op_mode->ops->enter_d0i3(op_mode);
 252 }
 253
 254 static inline int iwl_op_mode_exit_d0i3(struct iwl_op_mode *op_mode)
 255 {
 256         might_sleep();
 257
 258         if (!op_mode->ops->exit_d0i3)
 259                 return 0;
 260         return op_mode->ops->exit_d0i3(op_mode);
 261 }
 262
 263 static inline void iwl_op_mode_napi_add(struct iwl_op_mode *op_mode,
 264                                         struct napi_struct *napi,
 265                                         struct net_device *napi_dev,
 266                                         int (*poll)(struct napi_struct *, int),
 267                                         int weight)
 268 {
 269         if (!op_mode->ops->napi_add)
 270                 return;
 271         op_mode->ops->napi_add(op_mode, napi, napi_dev, poll, weight);
 272 }
 273
 274 #endif /* __iwl_op_mode_h__ */