include/linux/uwb/umc.h

   1 /*
   2  * UWB Multi-interface Controller support.
   3  *
   4  * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
   5  *
   6  * This file is released under the GPLv2
   7  *
   8  * UMC (UWB Multi-interface Controller) capabilities (e.g., radio
   9  * controller, host controller) are presented as devices on the "umc"
  10  * bus.
  11  *
  12  * The radio controller is not strictly a UMC capability but it's
  13  * useful to present it as such.
  14  *
  15  * References:
  16  *
  17  *   [WHCI] Wireless Host Controller Interface Specification for
  18  *          Certified Wireless Universal Serial Bus, revision 0.95.
  19  *
  20  * How this works is kind of convoluted but simple. The whci.ko driver
  21  * loads when WHCI devices are detected. These WHCI devices expose
  22  * many devices in the same PCI function (they couldn't have reused
  23  * functions, no), so for each PCI function that exposes these many
  24  * devices, whci ceates a umc_dev [whci_probe() -> whci_add_cap()]
  25  * with umc_device_create() and adds it to the bus with
  26  * umc_device_register().
  27  *
  28  * umc_device_register() calls device_register() which will push the
  29  * bus management code to load your UMC driver's somehting_probe()
  30  * that you have registered for that capability code.
  31  *
  32  * Now when the WHCI device is removed, whci_remove() will go over
  33  * each umc_dev assigned to each of the PCI function's capabilities
  34  * and through whci_del_cap() call umc_device_unregister() each
  35  * created umc_dev. Of course, if you are bound to the device, your
  36  * driver's something_remove() will be called.
  37  */
  38
  39 #ifndef _LINUX_UWB_UMC_H_
  40 #define _LINUX_UWB_UMC_H_
  41
  42 #include <linux/device.h>
  43 #include <linux/pci.h>
  44
  45 /*
  46  * UMC capability IDs.
  47  *
  48  * 0x00 is reserved so use it for the radio controller device.
  49  *
  50  * [WHCI] table 2-8
  51  */
  52 #define UMC_CAP_ID_WHCI_RC      0x00 /* radio controller */
  53 #define UMC_CAP_ID_WHCI_WUSB_HC 0x01 /* WUSB host controller */
  54
  55 /**
  56  * struct umc_dev - UMC capability device
  57  *
  58  * @version:  version of the specification this capability conforms to.
  59  * @cap_id:   capability ID.
  60  * @bar:      PCI Bar (64 bit) where the resource lies
  61  * @resource: register space resource.
  62  * @irq:      interrupt line.
  63  */
  64 struct umc_dev {
  65         u16             version;
  66         u8              cap_id;
  67         u8              bar;
  68         struct resource resource;
  69         unsigned        irq;
  70         struct device   dev;
  71 };
  72
  73 #define to_umc_dev(d) container_of(d, struct umc_dev, dev)
  74
  75 /**
  76  * struct umc_driver - UMC capability driver
  77  * @cap_id: supported capability ID.
  78  * @match: driver specific capability matching function.
  79  * @match_data: driver specific data for match() (e.g., a
  80  * table of pci_device_id's if umc_match_pci_id() is used).
  81  */
  82 struct umc_driver {
  83         char *name;
  84         u8 cap_id;
  85         int (*match)(struct umc_driver *, struct umc_dev *);
  86         const void *match_data;
  87
  88         int  (*probe)(struct umc_dev *);
  89         void (*remove)(struct umc_dev *);
  90         int  (*pre_reset)(struct umc_dev *);
  91         int  (*post_reset)(struct umc_dev *);
  92
  93         struct device_driver driver;
  94 };
  95
  96 #define to_umc_driver(d) container_of(d, struct umc_driver, driver)
  97
  98 extern struct bus_type umc_bus_type;
  99
 100 struct umc_dev *umc_device_create(struct device *parent, int n);
 101 int __must_check umc_device_register(struct umc_dev *umc);
 102 void umc_device_unregister(struct umc_dev *umc);
 103
 104 int __must_check __umc_driver_register(struct umc_driver *umc_drv,
 105                                        struct module *mod,
 106                                        const char *mod_name);
 107
 108 /**
 109  * umc_driver_register - register a UMC capabiltity driver.
 110  * @umc_drv:  pointer to the driver.
 111  */
 112 #define umc_driver_register(umc_drv) \
 113         __umc_driver_register(umc_drv, THIS_MODULE, KBUILD_MODNAME)
 114
 115 void umc_driver_unregister(struct umc_driver *umc_drv);
 116
 117 /*
 118  * Utility function you can use to match (umc_driver->match) against a
 119  * null-terminated array of 'struct pci_device_id' in
 120  * umc_driver->match_data.
 121  */
 122 int umc_match_pci_id(struct umc_driver *umc_drv, struct umc_dev *umc);
 123
 124 /**
 125  * umc_parent_pci_dev - return the UMC's parent PCI device or NULL if none
 126  * @umc_dev: UMC device whose parent PCI device we are looking for
 127  *
 128  * DIRTY!!! DON'T RELY ON THIS
 129  *
 130  * FIXME: This is as dirty as it gets, but we need some way to check
 131  * the correct type of umc_dev->parent (so that for example, we can
 132  * cast to pci_dev). Casting to pci_dev is necessary because at some
 133  * point we need to request resources from the device. Mapping is
 134  * easily over come (ioremap and stuff are bus agnostic), but hooking
 135  * up to some error handlers (such as pci error handlers) might need
 136  * this.
 137  *
 138  * THIS might (probably will) be removed in the future, so don't count
 139  * on it.
 140  */
 141 static inline struct pci_dev *umc_parent_pci_dev(struct umc_dev *umc_dev)
 142 {
 143         struct pci_dev *pci_dev = NULL;
 144         if (dev_is_pci(umc_dev->dev.parent))
 145                 pci_dev = to_pci_dev(umc_dev->dev.parent);
 146         return pci_dev;
 147 }
 148
 149 /**
 150  * umc_dev_get() - reference a UMC device.
 151  * @umc_dev: Pointer to UMC device.
 152  *
 153  * NOTE: we are assuming in this whole scheme that the parent device
 154  *       is referenced at _probe() time and unreferenced at _remove()
 155  *       time by the parent's subsystem.
 156  */
 157 static inline struct umc_dev *umc_dev_get(struct umc_dev *umc_dev)
 158 {
 159         get_device(&umc_dev->dev);
 160         return umc_dev;
 161 }
 162
 163 /**
 164  * umc_dev_put() - unreference a UMC device.
 165  * @umc_dev: Pointer to UMC device.
 166  */
 167 static inline void umc_dev_put(struct umc_dev *umc_dev)
 168 {
 169         put_device(&umc_dev->dev);
 170 }
 171
 172 /**
 173  * umc_set_drvdata - set UMC device's driver data.
 174  * @umc_dev: Pointer to UMC device.
 175  * @data:    Data to set.
 176  */
 177 static inline void umc_set_drvdata(struct umc_dev *umc_dev, void *data)
 178 {
 179         dev_set_drvdata(&umc_dev->dev, data);
 180 }
 181
 182 /**
 183  * umc_get_drvdata - recover UMC device's driver data.
 184  * @umc_dev: Pointer to UMC device.
 185  */
 186 static inline void *umc_get_drvdata(struct umc_dev *umc_dev)
 187 {
 188         return dev_get_drvdata(&umc_dev->dev);
 189 }
 190
 191 int umc_controller_reset(struct umc_dev *umc);
 192
 193 #endif /* #ifndef _LINUX_UWB_UMC_H_ */