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/*
* drivers/mfd/mfd-core.h
*
* core MFD support
* Copyright (c) 2006 Ian Molton
* Copyright (c) 2007 Dmitry Baryshkov
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef MFD_CORE_H
#define MFD_CORE_H
#include <linux/platform_device.h>
/*
* This struct describes the MFD part ("cell").
* After registration the copy of this structure will become the platform data
* of the resulting platform_device
*/
struct mfd_cell {
const char *name;
int id;
/* refcounting for multiple drivers to use a single cell */
atomic_t *usage_count;
int (*enable)(struct platform_device *dev);
int (*disable)(struct platform_device *dev);
int (*suspend)(struct platform_device *dev);
int (*resume)(struct platform_device *dev);
/* mfd_data can be used to pass data to client drivers */
void *mfd_data;
/*
* These resources can be specified relative to the parent device.
* For accessing hardware you should use resources from the platform dev
*/
int num_resources;
const struct resource *resources;
/* don't check for resource conflicts */
bool ignore_resource_conflicts;
/*
* Disable runtime PM callbacks for this subdevice - see
* pm_runtime_no_callbacks().
*/
bool pm_runtime_no_callbacks;
};
/*
* Convenience functions for clients using shared cells. Refcounting
* happens automatically, with the cell's enable/disable callbacks
* being called only when a device is first being enabled or no other
* clients are making use of it.
*/
extern int mfd_cell_enable(struct platform_device *pdev);
extern int mfd_cell_disable(struct platform_device *pdev);
/*
* "Clone" multiple platform devices for a single cell. This is to be used
* for devices that have multiple users of a cell. For example, if an mfd
* driver wants the cell "foo" to be used by a GPIO driver, an MTD driver,
* and a platform driver, the following bit of code would be use after first
* calling mfd_add_devices():
*
* const char *fclones[] = { "foo-gpio", "foo-mtd" };
* err = mfd_clone_cells("foo", fclones, ARRAY_SIZE(fclones));
*
* Each driver (MTD, GPIO, and platform driver) would then register
* platform_drivers for "foo-mtd", "foo-gpio", and "foo", respectively.
* The cell's .enable/.disable hooks should be used to deal with hardware
* resource contention.
*/
extern int mfd_clone_cell(const char *cell, const char **clones,
size_t n_clones);
/*
* Given a platform device that's been created by mfd_add_devices(), fetch
* the mfd_cell that created it.
*/
static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
{
return pdev->mfd_cell;
}
/*
* Given a platform device that's been created by mfd_add_devices(), fetch
* the .mfd_data entry from the mfd_cell that created it.
* Otherwise just return the platform_data pointer.
* This maintains compatibility with platform drivers whose devices aren't
* created by the mfd layer, and expect platform_data to contain what would've
* otherwise been in mfd_data.
*/
static inline void *mfd_get_data(struct platform_device *pdev)
{
const struct mfd_cell *cell = mfd_get_cell(pdev);
if (cell)
return cell->mfd_data;
else
return pdev->dev.platform_data;
}
extern int mfd_add_devices(struct device *parent, int id,
struct mfd_cell *cells, int n_devs,
struct resource *mem_base,
int irq_base);
extern void mfd_remove_devices(struct device *parent);
#endif
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