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c64a092671
Currently, the platform_bus allows customization of several of the
busses dev_pm_ops methods by using weak symbols so that platform code
can override them. The weak-symbol approach is not scalable when
wanting to support multiple platforms in a single kernel binary.
Instead, provide __init methods for platform code to customize the
dev_pm_ops methods at runtime.
NOTE: after these dynamic methods are merged, the weak symbols should
be removed from drivers/base/platform.c. AFAIK, this will only
affect SH and sh-mobile which should be converted to use this
runtime approach instead of the weak symbols. After SH &
sh-mobile are converted, the weak symobols could be removed.
Tested on OMAP3.
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
196 lines
7 KiB
C
196 lines
7 KiB
C
/*
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* platform_device.h - generic, centralized driver model
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*
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* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
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*
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* This file is released under the GPLv2
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*
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* See Documentation/driver-model/ for more information.
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*/
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#ifndef _PLATFORM_DEVICE_H_
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#define _PLATFORM_DEVICE_H_
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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struct platform_device {
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const char * name;
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int id;
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struct device dev;
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u32 num_resources;
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struct resource * resource;
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const struct platform_device_id *id_entry;
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/* arch specific additions */
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struct pdev_archdata archdata;
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};
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#define platform_get_device_id(pdev) ((pdev)->id_entry)
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#define to_platform_device(x) container_of((x), struct platform_device, dev)
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extern int platform_device_register(struct platform_device *);
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extern void platform_device_unregister(struct platform_device *);
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extern struct bus_type platform_bus_type;
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extern struct device platform_bus;
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extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
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extern int platform_get_irq(struct platform_device *, unsigned int);
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extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);
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extern int platform_get_irq_byname(struct platform_device *, const char *);
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extern int platform_add_devices(struct platform_device **, int);
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extern struct platform_device *platform_device_register_resndata(
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struct device *parent, const char *name, int id,
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const struct resource *res, unsigned int num,
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const void *data, size_t size);
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/**
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* platform_device_register_simple - add a platform-level device and its resources
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* @name: base name of the device we're adding
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* @id: instance id
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* @res: set of resources that needs to be allocated for the device
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* @num: number of resources
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*
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* This function creates a simple platform device that requires minimal
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* resource and memory management. Canned release function freeing memory
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* allocated for the device allows drivers using such devices to be
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* unloaded without waiting for the last reference to the device to be
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* dropped.
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*
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* This interface is primarily intended for use with legacy drivers which
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* probe hardware directly. Because such drivers create sysfs device nodes
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* themselves, rather than letting system infrastructure handle such device
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* enumeration tasks, they don't fully conform to the Linux driver model.
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* In particular, when such drivers are built as modules, they can't be
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* "hotplugged".
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*
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* Returns &struct platform_device pointer on success, or ERR_PTR() on error.
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*/
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static inline struct platform_device *platform_device_register_simple(
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const char *name, int id,
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const struct resource *res, unsigned int num)
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{
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return platform_device_register_resndata(NULL, name, id,
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res, num, NULL, 0);
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}
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/**
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* platform_device_register_data - add a platform-level device with platform-specific data
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* @parent: parent device for the device we're adding
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* @name: base name of the device we're adding
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* @id: instance id
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* @data: platform specific data for this platform device
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* @size: size of platform specific data
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*
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* This function creates a simple platform device that requires minimal
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* resource and memory management. Canned release function freeing memory
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* allocated for the device allows drivers using such devices to be
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* unloaded without waiting for the last reference to the device to be
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* dropped.
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*
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* Returns &struct platform_device pointer on success, or ERR_PTR() on error.
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*/
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static inline struct platform_device *platform_device_register_data(
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struct device *parent, const char *name, int id,
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const void *data, size_t size)
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{
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return platform_device_register_resndata(parent, name, id,
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NULL, 0, data, size);
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}
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extern struct platform_device *platform_device_alloc(const char *name, int id);
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extern int platform_device_add_resources(struct platform_device *pdev,
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const struct resource *res,
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unsigned int num);
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extern int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size);
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extern int platform_device_add(struct platform_device *pdev);
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extern void platform_device_del(struct platform_device *pdev);
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extern void platform_device_put(struct platform_device *pdev);
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struct platform_driver {
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int (*probe)(struct platform_device *);
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int (*remove)(struct platform_device *);
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void (*shutdown)(struct platform_device *);
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int (*suspend)(struct platform_device *, pm_message_t state);
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int (*resume)(struct platform_device *);
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struct device_driver driver;
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const struct platform_device_id *id_table;
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};
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extern int platform_driver_register(struct platform_driver *);
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extern void platform_driver_unregister(struct platform_driver *);
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/* non-hotpluggable platform devices may use this so that probe() and
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* its support may live in __init sections, conserving runtime memory.
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*/
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extern int platform_driver_probe(struct platform_driver *driver,
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int (*probe)(struct platform_device *));
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#define platform_get_drvdata(_dev) dev_get_drvdata(&(_dev)->dev)
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#define platform_set_drvdata(_dev,data) dev_set_drvdata(&(_dev)->dev, (data))
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extern struct platform_device *platform_create_bundle(struct platform_driver *driver,
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int (*probe)(struct platform_device *),
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struct resource *res, unsigned int n_res,
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const void *data, size_t size);
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extern const struct dev_pm_ops * platform_bus_get_pm_ops(void);
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extern void platform_bus_set_pm_ops(const struct dev_pm_ops *pm);
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/* early platform driver interface */
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struct early_platform_driver {
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const char *class_str;
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struct platform_driver *pdrv;
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struct list_head list;
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int requested_id;
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char *buffer;
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int bufsize;
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};
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#define EARLY_PLATFORM_ID_UNSET -2
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#define EARLY_PLATFORM_ID_ERROR -3
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extern int early_platform_driver_register(struct early_platform_driver *epdrv,
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char *buf);
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extern void early_platform_add_devices(struct platform_device **devs, int num);
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static inline int is_early_platform_device(struct platform_device *pdev)
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{
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return !pdev->dev.driver;
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}
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extern void early_platform_driver_register_all(char *class_str);
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extern int early_platform_driver_probe(char *class_str,
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int nr_probe, int user_only);
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extern void early_platform_cleanup(void);
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#define early_platform_init(class_string, platdrv) \
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early_platform_init_buffer(class_string, platdrv, NULL, 0)
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#ifndef MODULE
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#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz) \
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static __initdata struct early_platform_driver early_driver = { \
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.class_str = class_string, \
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.buffer = buf, \
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.bufsize = bufsiz, \
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.pdrv = platdrv, \
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.requested_id = EARLY_PLATFORM_ID_UNSET, \
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}; \
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static int __init early_platform_driver_setup_func(char *buffer) \
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{ \
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return early_platform_driver_register(&early_driver, buffer); \
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} \
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early_param(class_string, early_platform_driver_setup_func)
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#else /* MODULE */
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#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz) \
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static inline char *early_platform_driver_setup_func(void) \
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{ \
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return bufsiz ? buf : NULL; \
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}
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#endif /* MODULE */
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#endif /* _PLATFORM_DEVICE_H_ */
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