/* * ACPI PCI Hot Plug Controller Driver * * Copyright (C) 1995,2001 Compaq Computer Corporation * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) * Copyright (C) 2002,2003 NEC Corporation * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) * Copyright (C) 2003-2005 Hewlett Packard * * All rights reserved. * * 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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to * */ #include #include #include #include #include #include #include #include #include "acpiphp.h" #define MY_NAME "acpiphp" /* name size which is used for entries in pcihpfs */ #define SLOT_NAME_SIZE 21 /* {_SUN} */ static int debug; int acpiphp_debug; /* local variables */ static int num_slots; static struct acpiphp_attention_info *attention_info; #define DRIVER_VERSION "0.5" #define DRIVER_AUTHOR "Greg Kroah-Hartman , Takayoshi Kochi , Matthew Wilcox " #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); module_param(debug, bool, 0644); /* export the attention callback registration methods */ EXPORT_SYMBOL_GPL(acpiphp_register_attention); EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); static int enable_slot (struct hotplug_slot *slot); static int disable_slot (struct hotplug_slot *slot); static int set_attention_status (struct hotplug_slot *slot, u8 value); static int get_power_status (struct hotplug_slot *slot, u8 *value); static int get_attention_status (struct hotplug_slot *slot, u8 *value); static int get_latch_status (struct hotplug_slot *slot, u8 *value); static int get_adapter_status (struct hotplug_slot *slot, u8 *value); static struct hotplug_slot_ops acpi_hotplug_slot_ops = { .enable_slot = enable_slot, .disable_slot = disable_slot, .set_attention_status = set_attention_status, .get_power_status = get_power_status, .get_attention_status = get_attention_status, .get_latch_status = get_latch_status, .get_adapter_status = get_adapter_status, }; /** * acpiphp_register_attention - set attention LED callback * @info: must be completely filled with LED callbacks * * Description: This is used to register a hardware specific ACPI * driver that manipulates the attention LED. All the fields in * info must be set. */ int acpiphp_register_attention(struct acpiphp_attention_info *info) { int retval = -EINVAL; if (info && info->owner && info->set_attn && info->get_attn && !attention_info) { retval = 0; attention_info = info; } return retval; } /** * acpiphp_unregister_attention - unset attention LED callback * @info: must match the pointer used to register * * Description: This is used to un-register a hardware specific acpi * driver that manipulates the attention LED. The pointer to the * info struct must be the same as the one used to set it. */ int acpiphp_unregister_attention(struct acpiphp_attention_info *info) { int retval = -EINVAL; if (info && attention_info == info) { attention_info = NULL; retval = 0; } return retval; } /** * enable_slot - power on and enable a slot * @hotplug_slot: slot to enable * * Actual tasks are done in acpiphp_enable_slot() */ static int enable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = hotplug_slot->private; dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); /* enable the specified slot */ return acpiphp_enable_slot(slot->acpi_slot); } /** * disable_slot - disable and power off a slot * @hotplug_slot: slot to disable * * Actual tasks are done in acpiphp_disable_slot() */ static int disable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = hotplug_slot->private; int retval; dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); /* disable the specified slot */ retval = acpiphp_disable_slot(slot->acpi_slot); if (!retval) retval = acpiphp_eject_slot(slot->acpi_slot); return retval; } /** * set_attention_status - set attention LED * @hotplug_slot: slot to set attention LED on * @status: value to set attention LED to (0 or 1) * * attention status LED, so we use a callback that * was registered with us. This allows hardware specific * ACPI implementations to blink the light for us. */ static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) { int retval = -ENODEV; dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot)); if (attention_info && try_module_get(attention_info->owner)) { retval = attention_info->set_attn(hotplug_slot, status); module_put(attention_info->owner); } else attention_info = NULL; return retval; } /** * get_power_status - get power status of a slot * @hotplug_slot: slot to get status * @value: pointer to store status * * Some platforms may not implement _STA method properly. * In that case, the value returned may not be reliable. */ static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = hotplug_slot->private; dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); *value = acpiphp_get_power_status(slot->acpi_slot); return 0; } /** * get_attention_status - get attention LED status * @hotplug_slot: slot to get status from * @value: returns with value of attention LED * * ACPI doesn't have known method to determine the state * of the attention status LED, so we use a callback that * was registered with us. This allows hardware specific * ACPI implementations to determine its state. */ static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) { int retval = -EINVAL; dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot)); if (attention_info && try_module_get(attention_info->owner)) { retval = attention_info->get_attn(hotplug_slot, value); module_put(attention_info->owner); } else attention_info = NULL; return retval; } /** * get_latch_status - get latch status of a slot * @hotplug_slot: slot to get status * @value: pointer to store status * * ACPI doesn't provide any formal means to access latch status. * Instead, we fake latch status from _STA. */ static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = hotplug_slot->private; dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); *value = acpiphp_get_latch_status(slot->acpi_slot); return 0; } /** * get_adapter_status - get adapter status of a slot * @hotplug_slot: slot to get status * @value: pointer to store status * * ACPI doesn't provide any formal means to access adapter status. * Instead, we fake adapter status from _STA. */ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = hotplug_slot->private; dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); *value = acpiphp_get_adapter_status(slot->acpi_slot); return 0; } static int __init init_acpi(void) { int retval; /* initialize internal data structure etc. */ retval = acpiphp_glue_init(); /* read initial number of slots */ if (!retval) { num_slots = acpiphp_get_num_slots(); if (num_slots == 0) { acpiphp_glue_exit(); retval = -ENODEV; } } return retval; } /** * release_slot - free up the memory used by a slot * @hotplug_slot: slot to free */ static void release_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = hotplug_slot->private; dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); kfree(slot->hotplug_slot); kfree(slot); } /* callback routine to initialize 'struct slot' for each slot */ int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) { struct slot *slot; int retval = -ENOMEM; char name[SLOT_NAME_SIZE]; slot = kzalloc(sizeof(*slot), GFP_KERNEL); if (!slot) goto error; slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); if (!slot->hotplug_slot) goto error_slot; slot->hotplug_slot->info = &slot->info; slot->hotplug_slot->private = slot; slot->hotplug_slot->release = &release_slot; slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; slot->acpi_slot = acpiphp_slot; slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); slot->hotplug_slot->info->attention_status = 0; slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); acpiphp_slot->slot = slot; snprintf(name, SLOT_NAME_SIZE, "%llu", slot->acpi_slot->sun); retval = pci_hp_register(slot->hotplug_slot, acpiphp_slot->bridge->pci_bus, acpiphp_slot->device, name); if (retval == -EBUSY) goto error_hpslot; if (retval) { err("pci_hp_register failed with error %d\n", retval); goto error_hpslot; } info("Slot [%s] registered\n", slot_name(slot)); return 0; error_hpslot: kfree(slot->hotplug_slot); error_slot: kfree(slot); error: return retval; } void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) { struct slot *slot = acpiphp_slot->slot; int retval = 0; info("Slot [%s] unregistered\n", slot_name(slot)); retval = pci_hp_deregister(slot->hotplug_slot); if (retval) err("pci_hp_deregister failed with error %d\n", retval); } static int __init acpiphp_init(void) { info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); if (acpi_pci_disabled) return 0; acpiphp_debug = debug; /* read all the ACPI info from the system */ return init_acpi(); } static void __exit acpiphp_exit(void) { if (acpi_pci_disabled) return; /* deallocate internal data structures etc. */ acpiphp_glue_exit(); } module_init(acpiphp_init); module_exit(acpiphp_exit);