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Debug output in dmesg log may confuse users, so restrict debug output to cases where DEBUG is defined or dynamic debug output is enabled for the respective code piece. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
241 lines
4.9 KiB
C
241 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* core.c - contains all core device and protocol registration functions
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*
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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*/
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#include <linux/pnp.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/dma-mapping.h>
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#include "base.h"
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static LIST_HEAD(pnp_protocols);
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LIST_HEAD(pnp_global);
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DEFINE_MUTEX(pnp_lock);
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/*
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* ACPI or PNPBIOS should tell us about all platform devices, so we can
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* skip some blind probes. ISAPNP typically enumerates only plug-in ISA
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* devices, not built-in things like COM ports.
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*/
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int pnp_platform_devices;
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EXPORT_SYMBOL(pnp_platform_devices);
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static void pnp_remove_protocol(struct pnp_protocol *protocol)
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{
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mutex_lock(&pnp_lock);
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list_del(&protocol->protocol_list);
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mutex_unlock(&pnp_lock);
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}
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/**
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* pnp_register_protocol - adds a pnp protocol to the pnp layer
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* @protocol: pointer to the corresponding pnp_protocol structure
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*
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* Ex protocols: ISAPNP, PNPBIOS, etc
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*/
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int pnp_register_protocol(struct pnp_protocol *protocol)
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{
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struct list_head *pos;
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int nodenum, ret;
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INIT_LIST_HEAD(&protocol->devices);
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INIT_LIST_HEAD(&protocol->cards);
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nodenum = 0;
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mutex_lock(&pnp_lock);
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/* assign the lowest unused number */
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list_for_each(pos, &pnp_protocols) {
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struct pnp_protocol *cur = to_pnp_protocol(pos);
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if (cur->number == nodenum) {
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pos = &pnp_protocols;
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nodenum++;
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}
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}
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protocol->number = nodenum;
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dev_set_name(&protocol->dev, "pnp%d", nodenum);
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list_add_tail(&protocol->protocol_list, &pnp_protocols);
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mutex_unlock(&pnp_lock);
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ret = device_register(&protocol->dev);
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if (ret)
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pnp_remove_protocol(protocol);
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return ret;
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}
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/**
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* pnp_unregister_protocol - removes a pnp protocol from the pnp layer
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* @protocol: pointer to the corresponding pnp_protocol structure
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*/
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void pnp_unregister_protocol(struct pnp_protocol *protocol)
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{
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pnp_remove_protocol(protocol);
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device_unregister(&protocol->dev);
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}
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static void pnp_free_ids(struct pnp_dev *dev)
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{
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struct pnp_id *id;
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struct pnp_id *next;
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id = dev->id;
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while (id) {
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next = id->next;
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kfree(id);
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id = next;
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}
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}
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void pnp_free_resource(struct pnp_resource *pnp_res)
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{
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list_del(&pnp_res->list);
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kfree(pnp_res);
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}
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void pnp_free_resources(struct pnp_dev *dev)
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{
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struct pnp_resource *pnp_res, *tmp;
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list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
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pnp_free_resource(pnp_res);
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}
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}
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static void pnp_release_device(struct device *dmdev)
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{
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struct pnp_dev *dev = to_pnp_dev(dmdev);
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pnp_free_ids(dev);
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pnp_free_resources(dev);
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pnp_free_options(dev);
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kfree(dev);
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}
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struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
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const char *pnpid)
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{
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struct pnp_dev *dev;
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struct pnp_id *dev_id;
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dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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INIT_LIST_HEAD(&dev->resources);
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INIT_LIST_HEAD(&dev->options);
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dev->protocol = protocol;
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dev->number = id;
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dev->dma_mask = DMA_BIT_MASK(24);
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dev->dev.parent = &dev->protocol->dev;
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dev->dev.bus = &pnp_bus_type;
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dev->dev.dma_mask = &dev->dma_mask;
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dev->dev.coherent_dma_mask = dev->dma_mask;
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dev->dev.release = &pnp_release_device;
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dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
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dev_id = pnp_add_id(dev, pnpid);
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if (!dev_id) {
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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static void pnp_delist_device(struct pnp_dev *dev)
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{
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mutex_lock(&pnp_lock);
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list_del(&dev->global_list);
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list_del(&dev->protocol_list);
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mutex_unlock(&pnp_lock);
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}
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int __pnp_add_device(struct pnp_dev *dev)
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{
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int ret;
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pnp_fixup_device(dev);
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dev->status = PNP_READY;
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mutex_lock(&pnp_lock);
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list_add_tail(&dev->global_list, &pnp_global);
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list_add_tail(&dev->protocol_list, &dev->protocol->devices);
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mutex_unlock(&pnp_lock);
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ret = device_register(&dev->dev);
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if (ret)
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pnp_delist_device(dev);
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else if (dev->protocol->can_wakeup)
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device_set_wakeup_capable(&dev->dev,
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dev->protocol->can_wakeup(dev));
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return ret;
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}
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/*
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* pnp_add_device - adds a pnp device to the pnp layer
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* @dev: pointer to dev to add
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*
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* adds to driver model, name database, fixups, interface, etc.
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*/
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int pnp_add_device(struct pnp_dev *dev)
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{
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int ret;
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char buf[128];
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int len = 0;
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struct pnp_id *id;
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if (dev->card)
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return -EINVAL;
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ret = __pnp_add_device(dev);
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if (ret)
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return ret;
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buf[0] = '\0';
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for (id = dev->id; id; id = id->next)
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len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
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dev_dbg(&dev->dev, "%s device, IDs%s (%s)\n", dev->protocol->name, buf,
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dev->active ? "active" : "disabled");
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return 0;
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}
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void __pnp_remove_device(struct pnp_dev *dev)
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{
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pnp_delist_device(dev);
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device_unregister(&dev->dev);
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}
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static int __init pnp_init(void)
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{
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return bus_register(&pnp_bus_type);
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}
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subsys_initcall(pnp_init);
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int pnp_debug;
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#if defined(CONFIG_PNP_DEBUG_MESSAGES)
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module_param_named(debug, pnp_debug, int, 0644);
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#endif
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