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TOMOYO Linux Cross Reference
Linux/include/linux/mfd/core.h

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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  */
 24 struct 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  */
 63 extern int mfd_cell_enable(struct platform_device *pdev);
 64 extern 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  */
 81 extern 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  */
 88 static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
 89 {
 90         return pdev->mfd_cell;
 91 }
 92 
 93 extern 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 
 98 extern void mfd_remove_devices(struct device *parent);
 99 
100 #endif
101 

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