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

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  63 #ifndef __iwl_op_mode_h__
  64 #define __iwl_op_mode_h__
  65
  66 struct iwl_op_mode;
  67 struct iwl_trans;
  68 struct sk_buff;
  69 struct iwl_device_cmd;
  70 struct iwl_rx_cmd_buffer;
  71 struct iwl_fw;
  72 struct iwl_cfg;
  73
  74 /**
  75  * DOC: Operational mode - what is it ?
  76  *
  77  * The operational mode (a.k.a. op_mode) is the layer that implements
  78  * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
  79  * the transport API to access the HW. The op_mode doesn't need to know how the
  80  * underlying HW works, since the transport layer takes care of that.
  81  *
  82  * There can be several op_mode: i.e. different fw APIs will require two
  83  * different op_modes. This is why the op_mode is virtualized.
  84  */
  85
  86 /**
  87  * DOC: Life cycle of the Operational mode
  88  *
  89  * The operational mode has a very simple life cycle.
  90  *
  91  *      1) The driver layer (iwl-drv.c) chooses the op_mode based on the
  92  *         capabilities advertized by the fw file (in TLV format).
  93  *      2) The driver layer starts the op_mode (ops->start)
  94  *      3) The op_mode registers registers mac80211
  95  *      4) The op_mode is governed by mac80211
  96  *      5) The driver layer stops the op_mode
  97  */
  98
  99 /**
 100  * struct iwl_op_mode_ops - op_mode specific operations
 101  *
 102  * The op_mode exports its ops so that external components can start it and
 103  * interact with it. The driver layer typically calls the start and stop
 104  * handlers, the transport layer calls the others.
 105  *
 106  * All the handlers MUST be implemented
 107  *
 108  * @start: start the op_mode. The transport layer is already allocated.
 109  *      May sleep
 110  * @stop: stop the op_mode. Must free all the memory allocated.
 111  *      May sleep
 112  * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 113  *      HCMD the this Rx responds to.
 114  *      Must be atomic and called with BH disabled.
 115  * @queue_full: notifies that a HW queue is full.
 116  *      Must be atomic and called with BH disabled.
 117  * @queue_not_full: notifies that a HW queue is not full any more.
 118  *      Must be atomic and called with BH disabled.
 119  * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 120  *      the radio is killed. Must be atomic.
 121  * @free_skb: allows the transport layer to free skbs that haven't been
 122  *      reclaimed by the op_mode. This can happen when the driver is freed and
 123  *      there are Tx packets pending in the transport layer.
 124  *      Must be atomic
 125  * @nic_error: error notification. Must be atomic and must be called with BH
 126  *      disabled.
 127  * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 128  *      called with BH disabled.
 129  * @nic_config: configure NIC, called before firmware is started.
 130  *      May sleep
 131  * @wimax_active: invoked when WiMax becomes active.  Must be atomic and called
 132  *      with BH disabled.
 133  */
 134 struct iwl_op_mode_ops {
 135         struct iwl_op_mode *(*start)(struct iwl_trans *trans,
 136                                      const struct iwl_cfg *cfg,
 137                                      const struct iwl_fw *fw,
 138                                      struct dentry *dbgfs_dir);
 139         void (*stop)(struct iwl_op_mode *op_mode);
 140         int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
 141                   struct iwl_device_cmd *cmd);
 142         void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
 143         void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
 144         void (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
 145         void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
 146         void (*nic_error)(struct iwl_op_mode *op_mode);
 147         void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
 148         void (*nic_config)(struct iwl_op_mode *op_mode);
 149         void (*wimax_active)(struct iwl_op_mode *op_mode);
 150 };
 151
 152 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
 153 void iwl_opmode_deregister(const char *name);
 154
 155 /**
 156  * struct iwl_op_mode - operational mode
 157  *
 158  * This holds an implementation of the mac80211 / fw API.
 159  *
 160  * @ops - pointer to its own ops
 161  */
 162 struct iwl_op_mode {
 163         const struct iwl_op_mode_ops *ops;
 164         const struct iwl_trans *trans;
 165
 166         char op_mode_specific[0] __aligned(sizeof(void *));
 167 };
 168
 169 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
 170 {
 171         might_sleep();
 172         op_mode->ops->stop(op_mode);
 173 }
 174
 175 static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
 176                                   struct iwl_rx_cmd_buffer *rxb,
 177                                   struct iwl_device_cmd *cmd)
 178 {
 179         return op_mode->ops->rx(op_mode, rxb, cmd);
 180 }
 181
 182 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
 183                                           int queue)
 184 {
 185         op_mode->ops->queue_full(op_mode, queue);
 186 }
 187
 188 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
 189                                               int queue)
 190 {
 191         op_mode->ops->queue_not_full(op_mode, queue);
 192 }
 193
 194 static inline void iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode,
 195                                           bool state)
 196 {
 197         op_mode->ops->hw_rf_kill(op_mode, state);
 198 }
 199
 200 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
 201                                         struct sk_buff *skb)
 202 {
 203         op_mode->ops->free_skb(op_mode, skb);
 204 }
 205
 206 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
 207 {
 208         op_mode->ops->nic_error(op_mode);
 209 }
 210
 211 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 212 {
 213         op_mode->ops->cmd_queue_full(op_mode);
 214 }
 215
 216 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 217 {
 218         might_sleep();
 219         op_mode->ops->nic_config(op_mode);
 220 }
 221
 222 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
 223 {
 224         op_mode->ops->wimax_active(op_mode);
 225 }
 226
 227 #endif /* __iwl_op_mode_h__ */