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/*
* UWB Multi-interface Controller support.
*
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
*
* This file is released under the GPLv2
*
* UMC (UWB Multi-interface Controller) capabilities (e.g., radio
* controller, host controller) are presented as devices on the "umc"
* bus.
*
* The radio controller is not strictly a UMC capability but it's
* useful to present it as such.
*
* References:
*
* [WHCI] Wireless Host Controller Interface Specification for
* Certified Wireless Universal Serial Bus, revision 0.95.
*
* How this works is kind of convoluted but simple. The whci.ko driver
* loads when WHCI devices are detected. These WHCI devices expose
* many devices in the same PCI function (they couldn't have reused
* functions, no), so for each PCI function that exposes these many
* devices, whci ceates a umc_dev [whci_probe() -> whci_add_cap()]
* with umc_device_create() and adds it to the bus with
* umc_device_register().
*
* umc_device_register() calls device_register() which will push the
* bus management code to load your UMC driver's somehting_probe()
* that you have registered for that capability code.
*
* Now when the WHCI device is removed, whci_remove() will go over
* each umc_dev assigned to each of the PCI function's capabilities
* and through whci_del_cap() call umc_device_unregister() each
* created umc_dev. Of course, if you are bound to the device, your
* driver's something_remove() will be called.
*/
#ifndef _LINUX_UWB_UMC_H_
#define _LINUX_UWB_UMC_H_
#include <linux/device.h>
#include <linux/pci.h>
/*
* UMC capability IDs.
*
* 0x00 is reserved so use it for the radio controller device.
*
* [WHCI] table 2-8
*/
#define UMC_CAP_ID_WHCI_RC 0x00 /* radio controller */
#define UMC_CAP_ID_WHCI_WUSB_HC 0x01 /* WUSB host controller */
/**
* struct umc_dev - UMC capability device
*
* @version: version of the specification this capability conforms to.
* @cap_id: capability ID.
* @bar: PCI Bar (64 bit) where the resource lies
* @resource: register space resource.
* @irq: interrupt line.
*/
struct umc_dev {
u16 version;
u8 cap_id;
u8 bar;
struct resource resource;
unsigned irq;
struct device dev;
};
#define to_umc_dev(d) container_of(d, struct umc_dev, dev)
/**
* struct umc_driver - UMC capability driver
* @cap_id: supported capability ID.
* @match: driver specific capability matching function.
* @match_data: driver specific data for match() (e.g., a
* table of pci_device_id's if umc_match_pci_id() is used).
*/
struct umc_driver {
char *name;
u8 cap_id;
int (*match)(struct umc_driver *, struct umc_dev *);
const void *match_data;
int (*probe)(struct umc_dev *);
void (*remove)(struct umc_dev *);
int (*suspend)(struct umc_dev *, pm_message_t state);
int (*resume)(struct umc_dev *);
struct device_driver driver;
};
#define to_umc_driver(d) container_of(d, struct umc_driver, driver)
extern struct bus_type umc_bus_type;
struct umc_dev *umc_device_create(struct device *parent, int n);
int __must_check umc_device_register(struct umc_dev *umc);
void umc_device_unregister(struct umc_dev *umc);
int __must_check __umc_driver_register(struct umc_driver *umc_drv,
struct module *mod,
const char *mod_name);
/**
* umc_driver_register - register a UMC capabiltity driver.
* @umc_drv: pointer to the driver.
*/
static inline int __must_check umc_driver_register(struct umc_driver *umc_drv)
{
return __umc_driver_register(umc_drv, THIS_MODULE, KBUILD_MODNAME);
}
void umc_driver_unregister(struct umc_driver *umc_drv);
/*
* Utility function you can use to match (umc_driver->match) against a
* null-terminated array of 'struct pci_device_id' in
* umc_driver->match_data.
*/
int umc_match_pci_id(struct umc_driver *umc_drv, struct umc_dev *umc);
/**
* umc_parent_pci_dev - return the UMC's parent PCI device or NULL if none
* @umc_dev: UMC device whose parent PCI device we are looking for
*
* DIRTY!!! DON'T RELY ON THIS
*
* FIXME: This is as dirty as it gets, but we need some way to check
* the correct type of umc_dev->parent (so that for example, we can
* cast to pci_dev). Casting to pci_dev is necesary because at some
* point we need to request resources from the device. Mapping is
* easily over come (ioremap and stuff are bus agnostic), but hooking
* up to some error handlers (such as pci error handlers) might need
* this.
*
* THIS might (probably will) be removed in the future, so don't count
* on it.
*/
static inline struct pci_dev *umc_parent_pci_dev(struct umc_dev *umc_dev)
{
struct pci_dev *pci_dev = NULL;
if (umc_dev->dev.parent->bus == &pci_bus_type)
pci_dev = to_pci_dev(umc_dev->dev.parent);
return pci_dev;
}
/**
* umc_dev_get() - reference a UMC device.
* @umc_dev: Pointer to UMC device.
*
* NOTE: we are assuming in this whole scheme that the parent device
* is referenced at _probe() time and unreferenced at _remove()
* time by the parent's subsystem.
*/
static inline struct umc_dev *umc_dev_get(struct umc_dev *umc_dev)
{
get_device(&umc_dev->dev);
return umc_dev;
}
/**
* umc_dev_put() - unreference a UMC device.
* @umc_dev: Pointer to UMC device.
*/
static inline void umc_dev_put(struct umc_dev *umc_dev)
{
put_device(&umc_dev->dev);
}
/**
* umc_set_drvdata - set UMC device's driver data.
* @umc_dev: Pointer to UMC device.
* @data: Data to set.
*/
static inline void umc_set_drvdata(struct umc_dev *umc_dev, void *data)
{
dev_set_drvdata(&umc_dev->dev, data);
}
/**
* umc_get_drvdata - recover UMC device's driver data.
* @umc_dev: Pointer to UMC device.
*/
static inline void *umc_get_drvdata(struct umc_dev *umc_dev)
{
return dev_get_drvdata(&umc_dev->dev);
}
int umc_controller_reset(struct umc_dev *umc);
#endif /* #ifndef _LINUX_UWB_UMC_H_ */
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