drivers/net/wireless/iwlwifi/iwl-bus.h

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  63 #ifndef __iwl_bus_h__
  64 #define __iwl_bus_h__
  65
  66 #include <linux/types.h>
  67 #include <linux/spinlock.h>
  68
  69 /**
  70  * DOC: Bus layer - role and goal
  71  *
  72  * iwl-bus.h defines the API to the bus layer of the iwlwifi driver.
  73  * The bus layer is responsible for doing very basic bus operations that are
  74  * listed in the iwl_bus_ops structure.
  75  * The bus layer registers to the bus driver, advertises the supported HW and
  76  * gets notifications about enumeration, suspend, resume.
  77  * For the moment, the bus layer is not a linux kernel module as itself, and
  78  * the module_init function of the driver must call the bus specific
  79  * registration functions. These functions are listed at the end of this file.
  80  * For the moment, there is only one implementation of this interface: PCI-e.
  81  * This implementation is iwl-pci.c
  82  */
  83
  84 /**
  85  * DOC: encapsulation and type safety
  86  *
  87  * The iwl_bus describes the data that is shared amongst all the bus layer
  88  * implementations. This data is visible to other layers. Data in the bus
  89  * specific area is not visible outside the bus specific implementation.
  90  * iwl_bus holds a pointer to iwl_shared which holds pointer to all the other
  91  * layers of the driver (iwl_priv, iwl_trans). In fact, this is the way to go
  92  * when the transport layer needs to call a function of another layer.
  93  *
  94  * In order to achieve encapsulation, iwl_priv cannot be dereferenced from the
  95  * bus layer. Type safety is still kept since functions that gets iwl_priv gets
  96  * a typed pointer (as opposed to void *).
  97  */
  98
  99 /**
 100  * DOC: probe flow
 101  *
 102  * The module_init calls the bus specific registration function. The
 103  * registration to the bus layer will trigger an enumeration of the bus which
 104  * will call the bus specific probe function.
 105  * The first thing this function must do is to allocate the memory needed by
 106  * iwl_bus + the bus_specific data.
 107  * Once the bus specific probe function has configured the hardware, it
 108  * chooses the appropriate transport layer and calls iwl_probe that will run
 109  * the bus independent probe flow.
 110  *
 111  * Note: The bus specific code must set the following data in iwl_bus before it
 112  *       calls iwl_probe:
 113  *      * bus->dev
 114  *      * bus->irq
 115  *      * bus->ops
 116  */
 117
 118 struct iwl_shared;
 119 struct iwl_bus;
 120
 121 /**
 122  * struct iwl_bus - bus common data
 123  *
 124  * This data is common to all bus layer implementations.
 125  *
 126  * @ops - pointer to iwl_bus_ops
 127  * @shrd - pointer to iwl_shared which holds shared data from the upper layer
 128  *      NB: for the time being this needs to be set by the upper layer since
 129  *      it allocates the shared data
 130  */
 131 struct iwl_bus {
 132         struct iwl_shared *shrd;
 133
 134         /* pointer to bus specific struct */
 135         /*Ensure that this pointer will always be aligned to sizeof pointer */
 136         char bus_specific[0] __attribute__((__aligned__(sizeof(void *))));
 137 };
 138
 139 /*****************************************************
 140 * Bus layer registration functions
 141 ******************************************************/
 142 int __must_check iwl_pci_register_driver(void);
 143 void iwl_pci_unregister_driver(void);
 144
 145 #endif /* __iwl_bus_h__ */