patch-2.4.20 linux-2.4.20/drivers/hotplug/acpiphp_core.c
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- Lines: 471
- Date:
Thu Nov 28 15:53:12 2002
- Orig file:
linux-2.4.19/drivers/hotplug/acpiphp_core.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/drivers/hotplug/acpiphp_core.c linux-2.4.20/drivers/hotplug/acpiphp_core.c
@@ -0,0 +1,470 @@
+/*
+ * 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 Takayoshi Kochi (t-kouchi@cq.jp.nec.com)
+ * Copyright (c) 2002 NEC Corporation
+ *
+ * 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 <gregkh@us.ibm.com>,
+ * <h-aono@ap.jp.nec.com>,
+ * <t-kouchi@cq.jp.nec.com>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include "pci_hotplug.h"
+#include "acpiphp.h"
+
+static LIST_HEAD(slot_list);
+
+#if !defined(CONFIG_HOTPLUG_PCI_ACPI_MODULE)
+ #define MY_NAME "acpiphp"
+#else
+ #define MY_NAME THIS_MODULE->name
+#endif
+
+/* local variables */
+static int debug = 1; /* XXX set to 0 after debug */
+static int num_slots;
+
+#define DRIVER_VERSION "0.3"
+#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>"
+#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver"
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_PARM(debug, "i");
+MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
+
+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 hardware_test (struct hotplug_slot *slot, u32 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 = {
+ owner: THIS_MODULE,
+ enable_slot: enable_slot,
+ disable_slot: disable_slot,
+ set_attention_status: set_attention_status,
+ hardware_test: hardware_test,
+ get_power_status: get_power_status,
+ get_attention_status: get_attention_status,
+ get_latch_status: get_latch_status,
+ get_adapter_status: get_adapter_status,
+};
+
+
+/* Inline functions to check the sanity of a pointer that is passed to us */
+static inline int slot_paranoia_check (struct slot *slot, const char *function)
+{
+ if (!slot) {
+ dbg("%s - slot == NULL", function);
+ return -1;
+ }
+ if (slot->magic != SLOT_MAGIC) {
+ dbg("%s - bad magic number for slot", function);
+ return -1;
+ }
+ if (!slot->hotplug_slot) {
+ dbg("%s - slot->hotplug_slot == NULL!", function);
+ return -1;
+ }
+ return 0;
+}
+
+
+static inline struct slot *get_slot (struct hotplug_slot *hotplug_slot, const char *function)
+{
+ struct slot *slot;
+
+ if (!hotplug_slot) {
+ dbg("%s - hotplug_slot == NULL", function);
+ return NULL;
+ }
+
+ slot = (struct slot *)hotplug_slot->private;
+ if (slot_paranoia_check (slot, function))
+ return NULL;
+ return slot;
+}
+
+
+/**
+ * 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 = get_slot (hotplug_slot, __FUNCTION__);
+ int retval = 0;
+
+ if (slot == NULL)
+ return -ENODEV;
+
+ dbg ("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ /* enable the specified slot */
+ retval = acpiphp_enable_slot (slot->acpi_slot);
+
+ return retval;
+}
+
+
+/**
+ * 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 = get_slot (hotplug_slot, __FUNCTION__);
+ int retval = 0;
+
+ if (slot == NULL)
+ return -ENODEV;
+
+ dbg ("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ /* disable the specified slot */
+ retval = acpiphp_disable_slot (slot->acpi_slot);
+
+ return retval;
+}
+
+
+/**
+ * set_attention_status - set attention LED
+ *
+ * TBD:
+ * ACPI doesn't have known method to manipulate
+ * attention status LED.
+ *
+ */
+static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
+{
+ int retval = 0;
+
+ dbg ("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ switch (status) {
+ case 0:
+ /* FIXME turn light off */
+ hotplug_slot->info->attention_status = 0;
+ break;
+
+ case 1:
+ default:
+ /* FIXME turn light on */
+ hotplug_slot->info->attention_status = 1;
+ break;
+ }
+
+ return retval;
+}
+
+
+/**
+ * hardware_test - hardware test
+ *
+ * We have nothing to do for now...
+ *
+ */
+static int hardware_test (struct hotplug_slot *hotplug_slot, u32 value)
+{
+ struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
+ int retval = 0;
+
+ if (slot == NULL)
+ return -ENODEV;
+
+ dbg ("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ err ("No hardware tests are defined for this driver");
+ retval = -ENODEV;
+
+ 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 = get_slot (hotplug_slot, __FUNCTION__);
+ int retval = 0;
+
+ if (slot == NULL)
+ return -ENODEV;
+
+ dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ *value = acpiphp_get_power_status (slot->acpi_slot);
+
+ return retval;
+}
+
+
+/**
+ * get_attention_status - get attention LED status
+ *
+ * TBD:
+ * ACPI doesn't provide any formal means to access attention LED status.
+ *
+ */
+static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ int retval = 0;
+
+ dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ *value = hotplug_slot->info->attention_status;
+
+ 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 = get_slot (hotplug_slot, __FUNCTION__);
+ int retval = 0;
+
+ if (slot == NULL)
+ return -ENODEV;
+
+ dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ *value = acpiphp_get_latch_status (slot->acpi_slot);
+
+ return retval;
+}
+
+
+/**
+ * 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 = get_slot (hotplug_slot, __FUNCTION__);
+ int retval = 0;
+
+ if (slot == NULL)
+ return -ENODEV;
+
+ dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ *value = acpiphp_get_adapter_status (slot->acpi_slot);
+
+ return retval;
+}
+
+
+static int 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)
+ retval = -ENODEV;
+ }
+
+ return retval;
+}
+
+
+static void exit_acpi (void)
+{
+ /* deallocate internal data structures etc. */
+ acpiphp_glue_exit();
+}
+
+
+/**
+ * make_slot_name - make a slot name that appears in pcihpfs
+ * @slot: slot to name
+ *
+ */
+static void make_slot_name (struct slot *slot)
+{
+ snprintf (slot->hotplug_slot->name, SLOT_NAME_SIZE, "ACPI%x", slot->acpi_slot->sun);
+}
+
+/**
+ * init_slots - initialize 'struct slot' structures for each slot
+ *
+ */
+static int init_slots (void)
+{
+ struct slot *slot;
+ int retval = 0;
+ int i;
+
+ for (i = 0; i < num_slots; ++i) {
+ slot = kmalloc (sizeof (struct slot), GFP_KERNEL);
+ if (!slot)
+ return -ENOMEM;
+ memset(slot, 0, sizeof(struct slot));
+
+ slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
+ if (!slot->hotplug_slot) {
+ kfree (slot);
+ return -ENOMEM;
+ }
+ memset(slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
+
+ slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
+ if (!slot->hotplug_slot->info) {
+ kfree (slot->hotplug_slot);
+ kfree (slot);
+ return -ENOMEM;
+ }
+ memset(slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
+
+ slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL);
+ if (!slot->hotplug_slot->name) {
+ kfree (slot->hotplug_slot->info);
+ kfree (slot->hotplug_slot);
+ kfree (slot);
+ return -ENOMEM;
+ }
+
+ slot->magic = SLOT_MAGIC;
+ slot->number = i;
+
+ slot->hotplug_slot->private = slot;
+ slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
+
+ slot->acpi_slot = get_slot_from_id (i);
+ slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
+ slot->hotplug_slot->info->attention_status = acpiphp_get_attention_status(slot->acpi_slot);
+ 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);
+
+ make_slot_name (slot);
+
+ retval = pci_hp_register (slot->hotplug_slot);
+ if (retval) {
+ err ("pci_hp_register failed with error %d", retval);
+ kfree (slot->hotplug_slot->info);
+ kfree (slot->hotplug_slot->name);
+ kfree (slot->hotplug_slot);
+ kfree (slot);
+ return retval;
+ }
+
+ /* add slot to our internal list */
+ list_add (&slot->slot_list, &slot_list);
+ }
+
+ return retval;
+}
+
+
+static void cleanup_slots (void)
+{
+ struct list_head *tmp;
+ struct slot *slot;
+
+ list_for_each (tmp, &slot_list) {
+ slot = list_entry (tmp, struct slot, slot_list);
+ list_del (&slot->slot_list);
+ pci_hp_deregister (slot->hotplug_slot);
+ kfree (slot->hotplug_slot->info);
+ kfree (slot->hotplug_slot->name);
+ kfree (slot->hotplug_slot);
+ kfree (slot);
+ }
+
+ return;
+}
+
+
+static int __init acpiphp_init(void)
+{
+ int retval;
+
+ /* read all the ACPI info from the system */
+ retval = init_acpi();
+ if (retval)
+ return retval;
+
+ retval = init_slots();
+ if (retval)
+ return retval;
+
+ info (DRIVER_DESC " version: " DRIVER_VERSION);
+ return 0;
+}
+
+
+static void __exit acpiphp_exit(void)
+{
+ cleanup_slots();
+ exit_acpi();
+}
+
+module_init(acpiphp_init);
+module_exit(acpiphp_exit);
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