2 * drivers/mfd/mfd-core.h
5 * Copyright (c) 2006 Ian Molton
6 * Copyright (c) 2007 Dmitry Baryshkov
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.
17 #include <linux/platform_device.h>
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
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);
33 int (*suspend)(struct platform_device *dev);
34 int (*resume)(struct platform_device *dev);
36 /* mfd_data can be used to pass data to client drivers */
40 * These resources can be specified relative to the parent device.
41 * For accessing hardware you should use resources from the platform dev
44 const struct resource *resources;
46 /* don't check for resource conflicts */
47 bool ignore_resource_conflicts;
50 * Disable runtime PM callbacks for this subdevice - see
51 * pm_runtime_no_callbacks().
53 bool pm_runtime_no_callbacks;
57 * Convenience functions for clients using shared cells. Refcounting
58 * happens automatically, with the cell's enable/disable callbacks
59 * being called only when a device is first being enabled or no other
60 * clients are making use of it.
62 extern int mfd_cell_enable(struct platform_device *pdev);
63 extern int mfd_cell_disable(struct platform_device *pdev);
66 * "Clone" multiple platform devices for a single cell. This is to be used
67 * for devices that have multiple users of a cell. For example, if an mfd
68 * driver wants the cell "foo" to be used by a GPIO driver, an MTD driver,
69 * and a platform driver, the following bit of code would be use after first
70 * calling mfd_add_devices():
72 * const char *fclones[] = { "foo-gpio", "foo-mtd" };
73 * err = mfd_clone_cells("foo", fclones, ARRAY_SIZE(fclones));
75 * Each driver (MTD, GPIO, and platform driver) would then register
76 * platform_drivers for "foo-mtd", "foo-gpio", and "foo", respectively.
77 * The cell's .enable/.disable hooks should be used to deal with hardware
78 * resource contention.
80 extern int mfd_clone_cell(const char *cell, const char **clones,
84 * Given a platform device that's been created by mfd_add_devices(), fetch
85 * the mfd_cell that created it.
87 static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
89 return pdev->mfd_cell;
93 * Given a platform device that's been created by mfd_add_devices(), fetch
94 * the .mfd_data entry from the mfd_cell that created it.
95 * Otherwise just return the platform_data pointer.
96 * This maintains compatibility with platform drivers whose devices aren't
97 * created by the mfd layer, and expect platform_data to contain what would've
98 * otherwise been in mfd_data.
100 static inline void *mfd_get_data(struct platform_device *pdev)
102 const struct mfd_cell *cell = mfd_get_cell(pdev);
105 return cell->mfd_data;
107 return pdev->dev.platform_data;
110 extern int mfd_add_devices(struct device *parent, int id,
111 struct mfd_cell *cells, int n_devs,
112 struct resource *mem_base,
115 extern void mfd_remove_devices(struct device *parent);