/* * platform.c - platform 'pseudo' bus for legacy devices * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs * * This file is released under the GPLv2 * * Please see Documentation/driver-model/platform.txt for more * information. */ #include <linux/device.h>#include <linux/module.h>#include <linux/init.h>#include <linux/dma-mapping.h>#include <linux/bootmem.h>#include <linux/err.h> struct device platform_bus = {	.bus_id		= "platform",}; /** *	platform_get_resource - get a resource for a device *	@dev: platform device *	@type: resource type *	@num: resource index */struct resource *platform_get_resource(struct platform_device *dev, unsigned int type,		      unsigned int num){	int i; 	for (i = 0; i < dev->num_resources; i++) {		struct resource *r = &dev->resource[i]; 		if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|				 IORESOURCE_IRQ|IORESOURCE_DMA))		    == type)			if (num-- == 0)				return r;	}	return NULL;} /** *	platform_get_irq - get an IRQ for a device *	@dev: platform device *	@num: IRQ number index */int platform_get_irq(struct platform_device *dev, unsigned int num){	struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num); 	return r ? r->start : 0;} /** *	platform_get_resource_byname - get a resource for a device by name *	@dev: platform device *	@type: resource type *	@name: resource name */struct resource *platform_get_resource_byname(struct platform_device *dev, unsigned int type,		      char *name){	int i; 	for (i = 0; i < dev->num_resources; i++) {		struct resource *r = &dev->resource[i]; 		if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|				 IORESOURCE_IRQ|IORESOURCE_DMA)) == type)			if (!strcmp(r->name, name))				return r;	}	return NULL;} /** *	platform_get_irq - get an IRQ for a device *	@dev: platform device *	@name: IRQ name */int platform_get_irq_byname(struct platform_device *dev, char *name){	struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); 	return r ? r->start : 0;} /** *	platform_add_devices - add a numbers of platform devices *	@devs: array of platform devices to add *	@num: number of platform devices in array */int platform_add_devices(struct platform_device **devs, int num){	int i, ret = 0; 	for (i = 0; i < num; i++) {		ret = platform_device_register(devs[i]);		if (ret) {			while (--i >= 0)				platform_device_unregister(devs[i]);			break;		}	} 	return ret;} /** *	platform_device_register - add a platform-level device *	@pdev:	platform device we're adding * */int platform_device_register(struct platform_device * pdev){	int i, ret = 0; 	if (!pdev)		return -EINVAL; 	if (!pdev->dev.parent)		pdev->dev.parent = &platform_bus; 	pdev->dev.bus = &platform_bus_type; 	if (pdev->id != -1)		snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%u", pdev->name, pdev->id);	else		strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE); 	for (i = 0; i < pdev->num_resources; i++) {		struct resource *p, *r = &pdev->resource[i]; 		if (r->name == NULL)			r->name = pdev->dev.bus_id; 		p = r->parent;		if (!p) {			if (r->flags & IORESOURCE_MEM)				p = &iomem_resource;			else if (r->flags & IORESOURCE_IO)				p = &ioport_resource;		} 		if (p && request_resource(p, r)) {			printk(KERN_ERR			       "%s: failed to claim resource %d\n",			       pdev->dev.bus_id, i);			ret = -EBUSY;			goto failed;		}	} 	pr_debug("Registering platform device '%s'. Parent at %s\n",		 pdev->dev.bus_id, pdev->dev.parent->bus_id); 	ret = device_register(&pdev->dev);	if (ret == 0)		return ret;  failed:	while (--i >= 0)		if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO))			release_resource(&pdev->resource[i]);	return ret;} /** *	platform_device_unregister - remove a platform-level device *	@pdev:	platform device we're removing * *	Note that this function will also release all memory- and port-based *	resources owned by the device (@dev->resource). */void platform_device_unregister(struct platform_device * pdev){	int i; 	if (pdev) {		for (i = 0; i < pdev->num_resources; i++) {			struct resource *r = &pdev->resource[i];			if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))				release_resource(r);		} 		device_unregister(&pdev->dev);	}} struct platform_object {        struct platform_device pdev;        struct resource resources[0];}; static void platform_device_release_simple(struct device *dev){	struct platform_device *pdev = to_platform_device(dev); 	kfree(container_of(pdev, struct platform_object, pdev));} /** *	platform_device_register_simple *	@name:  base name of the device we're adding *	@id:    instance id *	@res:   set of resources that needs to be allocated for the device *	@num:	number of resources * *	This function creates a simple platform device that requires minimal *	resource and memory management. Canned release function freeing *	memory allocated for the device allows drivers using such devices *	to be unloaded iwithout waiting for the last reference to the device *	to be dropped. */struct platform_device *platform_device_register_simple(char *name, unsigned int id,							struct resource *res, unsigned int num){	struct platform_object *pobj;	int retval; 	pobj = kmalloc(sizeof(struct platform_object) + sizeof(struct resource) * num, GFP_KERNEL);	if (!pobj) {		retval = -ENOMEM;		goto error;	} 	memset(pobj, 0, sizeof(*pobj));	pobj->pdev.name = name;	pobj->pdev.id = id;	pobj->pdev.dev.release = platform_device_release_simple; 	if (num) {		memcpy(pobj->resources, res, sizeof(struct resource) * num);		pobj->pdev.resource = pobj->resources;		pobj->pdev.num_resources = num;	} 	retval = platform_device_register(&pobj->pdev);	if (retval)		goto error; 	return &pobj->pdev; error:	kfree(pobj);	return ERR_PTR(retval);}  /** *	platform_match - bind platform device to platform driver. *	@dev:	device. *	@drv:	driver. * *	Platform device IDs are assumed to be encoded like this: *	"<name><instance>", where <name> is a short description of the *	type of device, like "pci" or "floppy", and <instance> is the *	enumerated instance of the device, like '0' or '42'. *	Driver IDs are simply "<name>". *	So, extract the <name> from the platform_device structure, *	and compare it against the name of the driver. Return whether *	they match or not. */ static int platform_match(struct device * dev, struct device_driver * drv){	struct platform_device *pdev = container_of(dev, struct platform_device, dev); 	return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);} static int platform_suspend(struct device * dev, pm_message_t state){	int ret = 0; 	if (dev->driver && dev->driver->suspend) {		ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE);		if (ret == 0)			ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);		if (ret == 0)			ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);	}	return ret;} static int platform_resume(struct device * dev){	int ret = 0; 	if (dev->driver && dev->driver->resume) {		ret = dev->driver->resume(dev, RESUME_POWER_ON);		if (ret == 0)			ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);		if (ret == 0)			ret = dev->driver->resume(dev, RESUME_ENABLE);	}	return ret;} struct bus_type platform_bus_type = {	.name		= "platform",	.match		= platform_match,	.suspend	= platform_suspend,	.resume		= platform_resume,}; int __init platform_bus_init(void){	device_register(&platform_bus);	return bus_register(&platform_bus_type);} #ifndef ARCH_HAS_DMA_GET_REQUIRED_MASKu64 dma_get_required_mask(struct device *dev){	u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);	u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));	u64 mask; 	if (!high_totalram) {		/* convert to mask just covering totalram */		low_totalram = (1 << (fls(low_totalram) - 1));		low_totalram += low_totalram - 1;		mask = low_totalram;	} else {		high_totalram = (1 << (fls(high_totalram) - 1));		high_totalram += high_totalram - 1;		mask = (((u64)high_totalram) << 32) + 0xffffffff;	}	return mask & *dev->dma_mask;}EXPORT_SYMBOL_GPL(dma_get_required_mask);#endif EXPORT_SYMBOL_GPL(platform_bus);EXPORT_SYMBOL_GPL(platform_bus_type);EXPORT_SYMBOL_GPL(platform_add_devices);EXPORT_SYMBOL_GPL(platform_device_register);EXPORT_SYMBOL_GPL(platform_device_register_simple);EXPORT_SYMBOL_GPL(platform_device_unregister);EXPORT_SYMBOL_GPL(platform_get_irq);EXPORT_SYMBOL_GPL(platform_get_resource);EXPORT_SYMBOL_GPL(platform_get_irq_byname);EXPORT_SYMBOL_GPL(platform_get_resource_byname);