/* * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. * <benh@kernel.crashing.org> * and Arnd Bergmann, IBM Corp. * Merged from powerpc/kernel/of_platform.c and * sparc{,64}/kernel/of_device.c by Stephen Rothwell * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/errno.h> #include <linux/module.h> #include <linux/device.h> #include <linux/of_device.h> #include <linux/of_platform.h> static int of_platform_bus_match(struct device *dev, struct device_driver *drv) { struct of_device *of_dev = to_of_device(dev); struct of_platform_driver *of_drv = to_of_platform_driver(drv); const struct of_device_id *matches = of_drv->match_table; if (!matches) return 0; return of_match_device(matches, of_dev) != NULL; } static int of_platform_device_probe(struct device *dev) { int error = -ENODEV; struct of_platform_driver *drv; struct of_device *of_dev; const struct of_device_id *match; drv = to_of_platform_driver(dev->driver); of_dev = to_of_device(dev); if (!drv->probe) return error; of_dev_get(of_dev); match = of_match_device(drv->match_table, of_dev); if (match) error = drv->probe(of_dev, match); if (error) of_dev_put(of_dev); return error; } static int of_platform_device_remove(struct device *dev) { struct of_device *of_dev = to_of_device(dev); struct of_platform_driver *drv = to_of_platform_driver(dev->driver); if (dev->driver && drv->remove) drv->remove(of_dev); return 0; } static int of_platform_device_suspend(struct device *dev, pm_message_t state) { struct of_device *of_dev = to_of_device(dev); struct of_platform_driver *drv = to_of_platform_driver(dev->driver); int error = 0; if (dev->driver && drv->suspend) error = drv->suspend(of_dev, state); return error; } static int of_platform_device_resume(struct device * dev) { struct of_device *of_dev = to_of_device(dev); struct of_platform_driver *drv = to_of_platform_driver(dev->driver); int error = 0; if (dev->driver && drv->resume) error = drv->resume(of_dev); return error; } static void of_platform_device_shutdown(struct device *dev) { struct of_device *of_dev = to_of_device(dev); struct of_platform_driver *drv = to_of_platform_driver(dev->driver); if (dev->driver && drv->shutdown) drv->shutdown(of_dev); } int of_bus_type_init(struct bus_type *bus, const char *name) { bus->name = name; bus->match = of_platform_bus_match; bus->probe = of_platform_device_probe; bus->remove = of_platform_device_remove; bus->suspend = of_platform_device_suspend; bus->resume = of_platform_device_resume; bus->shutdown = of_platform_device_shutdown; return bus_register(bus); } int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus) { /* initialize common driver fields */ if (!drv->driver.name) drv->driver.name = drv->name; if (!drv->driver.owner) drv->driver.owner = drv->owner; drv->driver.bus = bus; /* register with core */ return driver_register(&drv->driver); } EXPORT_SYMBOL(of_register_driver); void of_unregister_driver(struct of_platform_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL(of_unregister_driver);