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 #include <linux/debugfs.h>
  67
  68 struct iwl_op_mode;
  69 struct iwl_trans;
  70 struct sk_buff;
  71 struct iwl_device_cmd;
  72 struct iwl_rx_cmd_buffer;
  73 struct iwl_fw;
  74 struct iwl_cfg;
  75
  76 /**
  77  * DOC: Operational mode - what is it ?
  78  *
  79  * The operational mode (a.k.a. op_mode) is the layer that implements
  80  * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
  81  * the transport API to access the HW. The op_mode doesn't need to know how the
  82  * underlying HW works, since the transport layer takes care of that.
  83  *
  84  * There can be several op_mode: i.e. different fw APIs will require two
  85  * different op_modes. This is why the op_mode is virtualized.
  86  */
  87
  88 /**
  89  * DOC: Life cycle of the Operational mode
  90  *
  91  * The operational mode has a very simple life cycle.
  92  *
  93  *      1) The driver layer (iwl-drv.c) chooses the op_mode based on the
  94  *         capabilities advertized by the fw file (in TLV format).
  95  *      2) The driver layer starts the op_mode (ops->start)
  96  *      3) The op_mode registers registers mac80211
  97  *      4) The op_mode is governed by mac80211
  98  *      5) The driver layer stops the op_mode
  99  */
 100
 101 /**
 102  * struct iwl_op_mode_ops - op_mode specific operations
 103  *
 104  * The op_mode exports its ops so that external components can start it and
 105  * interact with it. The driver layer typically calls the start and stop
 106  * handlers, the transport layer calls the others.
 107  *
 108  * All the handlers MUST be implemented
 109  *
 110  * @start: start the op_mode. The transport layer is already allocated.
 111  *      May sleep
 112  * @stop: stop the op_mode. Must free all the memory allocated.
 113  *      May sleep
 114  * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 115  *      HCMD the this Rx responds to.
 116  *      This callback may sleep, it is called from a threaded IRQ handler.
 117  * @queue_full: notifies that a HW queue is full.
 118  *      Must be atomic and called with BH disabled.
 119  * @queue_not_full: notifies that a HW queue is not full any more.
 120  *      Must be atomic and called with BH disabled.
 121  * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 122  *      the radio is killed. May sleep.
 123  * @free_skb: allows the transport layer to free skbs that haven't been
 124  *      reclaimed by the op_mode. This can happen when the driver is freed and
 125  *      there are Tx packets pending in the transport layer.
 126  *      Must be atomic
 127  * @nic_error: error notification. Must be atomic and must be called with BH
 128  *      disabled.
 129  * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 130  *      called with BH disabled.
 131  * @nic_config: configure NIC, called before firmware is started.
 132  *      May sleep
 133  * @wimax_active: invoked when WiMax becomes active. May sleep
 134  */
 135 struct iwl_op_mode_ops {
 136         struct iwl_op_mode *(*start)(struct iwl_trans *trans,
 137                                      const struct iwl_cfg *cfg,
 138                                      const struct iwl_fw *fw,
 139                                      struct dentry *dbgfs_dir);
 140         void (*stop)(struct iwl_op_mode *op_mode);
 141         int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
 142                   struct iwl_device_cmd *cmd);
 143         void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
 144         void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
 145         void (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
 146         void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
 147         void (*nic_error)(struct iwl_op_mode *op_mode);
 148         void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
 149         void (*nic_config)(struct iwl_op_mode *op_mode);
 150         void (*wimax_active)(struct iwl_op_mode *op_mode);
 151 };
 152
 153 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
 154 void iwl_opmode_deregister(const char *name);
 155
 156 /**
 157  * struct iwl_op_mode - operational mode
 158  *
 159  * This holds an implementation of the mac80211 / fw API.
 160  *
 161  * @ops - pointer to its own ops
 162  */
 163 struct iwl_op_mode {
 164         const struct iwl_op_mode_ops *ops;
 165         const struct iwl_trans *trans;
 166
 167         char op_mode_specific[0] __aligned(sizeof(void *));
 168 };
 169
 170 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
 171 {
 172         might_sleep();
 173         op_mode->ops->stop(op_mode);
 174 }
 175
 176 static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
 177                                   struct iwl_rx_cmd_buffer *rxb,
 178                                   struct iwl_device_cmd *cmd)
 179 {
 180         might_sleep();
 181         return op_mode->ops->rx(op_mode, rxb, cmd);
 182 }
 183
 184 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
 185                                           int queue)
 186 {
 187         op_mode->ops->queue_full(op_mode, queue);
 188 }
 189
 190 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
 191                                               int queue)
 192 {
 193         op_mode->ops->queue_not_full(op_mode, queue);
 194 }
 195
 196 static inline void iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode,
 197                                           bool state)
 198 {
 199         might_sleep();
 200         op_mode->ops->hw_rf_kill(op_mode, state);
 201 }
 202
 203 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
 204                                         struct sk_buff *skb)
 205 {
 206         op_mode->ops->free_skb(op_mode, skb);
 207 }
 208
 209 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
 210 {
 211         op_mode->ops->nic_error(op_mode);
 212 }
 213
 214 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 215 {
 216         op_mode->ops->cmd_queue_full(op_mode);
 217 }
 218
 219 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 220 {
 221         might_sleep();
 222         op_mode->ops->nic_config(op_mode);
 223 }
 224
 225 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
 226 {
 227         might_sleep();
 228         op_mode->ops->wimax_active(op_mode);
 229 }
 230
 231 #endif /* __iwl_op_mode_h__ */