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240 lines
4.9 KiB
240 lines
4.9 KiB
// 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 <[email protected]> |
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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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