diff options
Diffstat (limited to 'drivers/pci/hotplug/acpiphp_core.c')
| -rw-r--r-- | drivers/pci/hotplug/acpiphp_core.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c new file mode 100644 index 000000000..853e04ad2 --- /dev/null +++ b/drivers/pci/hotplug/acpiphp_core.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * 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 (willy@infradead.org) + * Copyright (C) 2003-2005 Hewlett Packard + * + * All rights reserved. + * + * Send feedback to <kristen.c.accardi@intel.com> + * + */ + +#define pr_fmt(fmt) "acpiphp: " fmt + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/moduleparam.h> + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/pci-acpi.h> +#include <linux/pci_hotplug.h> +#include <linux/slab.h> +#include <linux/smp.h> +#include "acpiphp.h" + +/* name size which is used for entries in pcihpfs */ +#define SLOT_NAME_SIZE 21 /* {_SUN} */ + +bool acpiphp_disabled; + +/* local variables */ +static struct acpiphp_attention_info *attention_info; + +#define DRIVER_VERSION "0.5" +#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@infradead.org>" +#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); +MODULE_PARM_DESC(disable, "disable acpiphp driver"); +module_param_named(disable, acpiphp_disabled, bool, 0444); + +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 const 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; +} +EXPORT_SYMBOL_GPL(acpiphp_register_attention); + + +/** + * 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; +} +EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); + + +/** + * 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 = to_slot(hotplug_slot); + + pr_debug("%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 = to_slot(hotplug_slot); + + pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); + + /* disable the specified slot */ + return acpiphp_disable_slot(slot->acpi_slot); +} + + +/** + * 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; + + pr_debug("%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 = to_slot(hotplug_slot); + + pr_debug("%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; + + pr_debug("%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 = to_slot(hotplug_slot); + + pr_debug("%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 = to_slot(hotplug_slot); + + pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); + + *value = acpiphp_get_adapter_status(slot->acpi_slot); + + return 0; +} + +/* callback routine to initialize 'struct slot' for each slot */ +int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot, + unsigned int sun) +{ + struct slot *slot; + int retval = -ENOMEM; + char name[SLOT_NAME_SIZE]; + + slot = kzalloc(sizeof(*slot), GFP_KERNEL); + if (!slot) + goto error; + + slot->hotplug_slot.ops = &acpi_hotplug_slot_ops; + + slot->acpi_slot = acpiphp_slot; + + acpiphp_slot->slot = slot; + slot->sun = sun; + snprintf(name, SLOT_NAME_SIZE, "%u", sun); + + retval = pci_hp_register(&slot->hotplug_slot, acpiphp_slot->bus, + acpiphp_slot->device, name); + if (retval == -EBUSY) + goto error_slot; + if (retval) { + pr_err("pci_hp_register failed with error %d\n", retval); + goto error_slot; + } + + pr_info("Slot [%s] registered\n", slot_name(slot)); + + return 0; +error_slot: + kfree(slot); +error: + return retval; +} + + +void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) +{ + struct slot *slot = acpiphp_slot->slot; + + pr_info("Slot [%s] unregistered\n", slot_name(slot)); + + pci_hp_deregister(&slot->hotplug_slot); + kfree(slot); +} + + +void __init acpiphp_init(void) +{ + pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n", + acpiphp_disabled ? ", disabled by user; please report a bug" + : ""); +} |