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/include/linux/mfd/core.h

https://github.com/airy09/android_kernel_sony_apq8064
C Header | 100 lines | 32 code | 15 blank | 53 comment | 0 complexity | 4bbceb32a6f90b8f44a7f8dc2a367052 MD5 | raw file
  1/*
  2 * drivers/mfd/mfd-core.h
  3 *
  4 * core MFD support
  5 * Copyright (c) 2006 Ian Molton
  6 * Copyright (c) 2007 Dmitry Baryshkov
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License version 2 as
 10 * published by the Free Software Foundation.
 11 *
 12 */
 13
 14#ifndef MFD_CORE_H
 15#define MFD_CORE_H
 16
 17#include <linux/platform_device.h>
 18
 19/*
 20 * This struct describes the MFD part ("cell").
 21 * After registration the copy of this structure will become the platform data
 22 * of the resulting platform_device
 23 */
 24struct mfd_cell {
 25	const char		*name;
 26	int			id;
 27
 28	/* refcounting for multiple drivers to use a single cell */
 29	atomic_t		*usage_count;
 30	int			(*enable)(struct platform_device *dev);
 31	int			(*disable)(struct platform_device *dev);
 32
 33	int			(*suspend)(struct platform_device *dev);
 34	int			(*resume)(struct platform_device *dev);
 35
 36	/* platform data passed to the sub devices drivers */
 37	void			*platform_data;
 38	size_t			pdata_size;
 39
 40	/*
 41	 * These resources can be specified relative to the parent device.
 42	 * For accessing hardware you should use resources from the platform dev
 43	 */
 44	int			num_resources;
 45	const struct resource	*resources;
 46
 47	/* don't check for resource conflicts */
 48	bool			ignore_resource_conflicts;
 49
 50	/*
 51	 * Disable runtime PM callbacks for this subdevice - see
 52	 * pm_runtime_no_callbacks().
 53	 */
 54	bool			pm_runtime_no_callbacks;
 55};
 56
 57/*
 58 * Convenience functions for clients using shared cells.  Refcounting
 59 * happens automatically, with the cell's enable/disable callbacks
 60 * being called only when a device is first being enabled or no other
 61 * clients are making use of it.
 62 */
 63extern int mfd_cell_enable(struct platform_device *pdev);
 64extern int mfd_cell_disable(struct platform_device *pdev);
 65
 66/*
 67 * "Clone" multiple platform devices for a single cell. This is to be used
 68 * for devices that have multiple users of a cell.  For example, if an mfd
 69 * driver wants the cell "foo" to be used by a GPIO driver, an MTD driver,
 70 * and a platform driver, the following bit of code would be use after first
 71 * calling mfd_add_devices():
 72 *
 73 * const char *fclones[] = { "foo-gpio", "foo-mtd" };
 74 * err = mfd_clone_cells("foo", fclones, ARRAY_SIZE(fclones));
 75 *
 76 * Each driver (MTD, GPIO, and platform driver) would then register
 77 * platform_drivers for "foo-mtd", "foo-gpio", and "foo", respectively.
 78 * The cell's .enable/.disable hooks should be used to deal with hardware
 79 * resource contention.
 80 */
 81extern int mfd_clone_cell(const char *cell, const char **clones,
 82		size_t n_clones);
 83
 84/*
 85 * Given a platform device that's been created by mfd_add_devices(), fetch
 86 * the mfd_cell that created it.
 87 */
 88static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
 89{
 90	return pdev->mfd_cell;
 91}
 92
 93extern int mfd_add_devices(struct device *parent, int id,
 94			   struct mfd_cell *cells, int n_devs,
 95			   struct resource *mem_base,
 96			   int irq_base);
 97
 98extern void mfd_remove_devices(struct device *parent);
 99
100#endif