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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