// SPDX-License-Identifier: GPL-2.0/* * core.c - contains all core device and protocol registration functions * * Copyright 2002 Adam Belay <ambx1@neo.rr.com> */ #include <linux/pnp.h>#include <linux/types.h>#include <linux/list.h>#include <linux/device.h>#include <linux/module.h>#include <linux/mutex.h>#include <linux/init.h>#include <linux/string.h>#include <linux/slab.h>#include <linux/errno.h>#include <linux/dma-mapping.h> #include "base.h" static LIST_HEAD(pnp_protocols);LIST_HEAD(pnp_global);DEFINE_MUTEX(pnp_lock); /* * ACPI or PNPBIOS should tell us about all platform devices, so we can * skip some blind probes.  ISAPNP typically enumerates only plug-in ISA * devices, not built-in things like COM ports. */int pnp_platform_devices;EXPORT_SYMBOL(pnp_platform_devices); static void pnp_remove_protocol(struct pnp_protocol *protocol){	mutex_lock(&pnp_lock);	list_del(&protocol->protocol_list);	mutex_unlock(&pnp_lock);} /** * pnp_register_protocol - adds a pnp protocol to the pnp layer * @protocol: pointer to the corresponding pnp_protocol structure * *  Ex protocols: ISAPNP, PNPBIOS, etc */int pnp_register_protocol(struct pnp_protocol *protocol){	struct list_head *pos;	int nodenum, ret; 	INIT_LIST_HEAD(&protocol->devices);	INIT_LIST_HEAD(&protocol->cards);	nodenum = 0; 	mutex_lock(&pnp_lock); 	/* assign the lowest unused number */	list_for_each(pos, &pnp_protocols) {		struct pnp_protocol *cur = to_pnp_protocol(pos);		if (cur->number == nodenum) {			pos = &pnp_protocols;			nodenum++;		}	} 	protocol->number = nodenum;	dev_set_name(&protocol->dev, "pnp%d", nodenum); 	list_add_tail(&protocol->protocol_list, &pnp_protocols); 	mutex_unlock(&pnp_lock); 	ret = device_register(&protocol->dev);	if (ret)		pnp_remove_protocol(protocol); 	return ret;} static void pnp_free_ids(struct pnp_dev *dev){	struct pnp_id *id;	struct pnp_id *next; 	id = dev->id;	while (id) {		next = id->next;		kfree(id);		id = next;	}} void pnp_free_resource(struct pnp_resource *pnp_res){	list_del(&pnp_res->list);	kfree(pnp_res);} void pnp_free_resources(struct pnp_dev *dev){	struct pnp_resource *pnp_res, *tmp; 	list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {		pnp_free_resource(pnp_res);	}} static void pnp_release_device(struct device *dmdev){	struct pnp_dev *dev = to_pnp_dev(dmdev); 	pnp_free_ids(dev);	pnp_free_resources(dev);	pnp_free_options(dev);	kfree(dev);} struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,			      const char *pnpid){	struct pnp_dev *dev;	struct pnp_id *dev_id; 	dev = kzalloc_obj(struct pnp_dev);	if (!dev)		return NULL; 	INIT_LIST_HEAD(&dev->resources);	INIT_LIST_HEAD(&dev->options);	dev->protocol = protocol;	dev->number = id;	dev->dma_mask = DMA_BIT_MASK(24); 	dev->dev.parent = &dev->protocol->dev;	dev->dev.bus = &pnp_bus_type;	dev->dev.dma_mask = &dev->dma_mask;	dev->dev.coherent_dma_mask = dev->dma_mask;	dev->dev.release = &pnp_release_device; 	dev_id = pnp_add_id(dev, pnpid);	if (!dev_id) {		kfree(dev);		return NULL;	} 	dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number); 	return dev;} static void pnp_delist_device(struct pnp_dev *dev){	mutex_lock(&pnp_lock);	list_del(&dev->global_list);	list_del(&dev->protocol_list);	mutex_unlock(&pnp_lock);} int __pnp_add_device(struct pnp_dev *dev){	int ret; 	pnp_fixup_device(dev);	dev->status = PNP_READY; 	mutex_lock(&pnp_lock); 	list_add_tail(&dev->global_list, &pnp_global);	list_add_tail(&dev->protocol_list, &dev->protocol->devices); 	mutex_unlock(&pnp_lock); 	ret = device_register(&dev->dev);	if (ret)		pnp_delist_device(dev);	else if (dev->protocol->can_wakeup)		device_set_wakeup_capable(&dev->dev,				dev->protocol->can_wakeup(dev)); 	return ret;} /* * pnp_add_device - adds a pnp device to the pnp layer * @dev: pointer to dev to add * *  adds to driver model, name database, fixups, interface, etc. */int pnp_add_device(struct pnp_dev *dev){	int ret;	char buf[128];	int len = 0;	struct pnp_id *id; 	if (dev->card)		return -EINVAL; 	ret = __pnp_add_device(dev);	if (ret)		return ret; 	buf[0] = '\0';	for (id = dev->id; id; id = id->next)		len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id); 	dev_dbg(&dev->dev, "%s device, IDs%s (%s)\n", dev->protocol->name, buf,		dev->active ? "active" : "disabled");	return 0;} static int __init pnp_init(void){	return bus_register(&pnp_bus_type);} subsys_initcall(pnp_init); int pnp_debug; #if defined(CONFIG_PNP_DEBUG_MESSAGES)module_param_named(debug, pnp_debug, int, 0644);#endif