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Diffstat (limited to 'include/linux/mfd/core.h')
| -rw-r--r-- | include/linux/mfd/core.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h new file mode 100644 index 00000000..4e76163d --- /dev/null +++ b/include/linux/mfd/core.h @@ -0,0 +1,100 @@ +/* + * 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); + + /* platform data passed to the sub devices drivers */ + void *platform_data; + size_t pdata_size; + + /* + * 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; +} + +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 |