drivers/pci/hotplug/rpaphp_slot.c - kernel/msm - Gitiles

 /*
  * RPA Virtual I/O device functions
  * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
  *
  * 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 <lxie@us.ibm.com>
  *
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/sysfs.h>
 #include <linux/pci.h>
 #include <asm/rtas.h>
 #include "rpaphp.h"

 static ssize_t removable_read_file (struct hotplug_slot *php_slot, char *buf)
 {
 	u8 value;
 	int retval = -ENOENT;
 	struct slot *slot = (struct slot *)php_slot->private;

 	if (!slot)
 		return retval;

 	value = slot->removable;
 	retval = sprintf (buf, "%d\n", value);
 	return retval;
 }

 static struct hotplug_slot_attribute hotplug_slot_attr_removable = {
 	.attr = {.name = "phy_removable", .mode = S_IFREG | S_IRUGO},
 	.show = removable_read_file,
 };

 static void rpaphp_sysfs_add_attr_removable (struct hotplug_slot *slot)
 {
 	sysfs_create_file(&slot->kobj, &hotplug_slot_attr_removable.attr);
 }

 static void rpaphp_sysfs_remove_attr_removable (struct hotplug_slot *slot)
 {
 	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_removable.attr);
 }

 static ssize_t location_read_file (struct hotplug_slot *php_slot, char *buf)
 {
         char *value;
         int retval = -ENOENT;
 	struct slot *slot = (struct slot *)php_slot->private;

 	if (!slot)
 		return retval;

         value = slot->location;
         retval = sprintf (buf, "%s\n", value);
         return retval;
 }

 static struct hotplug_slot_attribute hotplug_slot_attr_location = {
 	.attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
 	.show = location_read_file,
 };

 static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
 {
 	sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
 }

 static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
 {
 	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
 }

 /* free up the memory used by a slot */
 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = (struct slot *) hotplug_slot->private;

 	dealloc_slot_struct(slot);
 }

 void dealloc_slot_struct(struct slot *slot)
 {
 	kfree(slot->hotplug_slot->info);
 	kfree(slot->hotplug_slot->name);
 	kfree(slot->hotplug_slot);
 	kfree(slot);
 	return;
 }

 struct slot *alloc_slot_struct(struct device_node *dn, int drc_index, char *drc_name,
 		  int power_domain)
 {
 	struct slot *slot;

 	slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
 	if (!slot)
 		goto error_nomem;
 	memset(slot, 0, sizeof (struct slot));
 	slot->hotplug_slot = kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
 	if (!slot->hotplug_slot)
 		goto error_slot;
 	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)
 		goto error_hpslot;
 	memset(slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
 	slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
 	if (!slot->hotplug_slot->name)
 		goto error_info;
 	slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
 	if (!slot->location)
 		goto error_name;
 	slot->name = slot->hotplug_slot->name;
 	slot->dn = dn;
 	slot->index = drc_index;
 	strcpy(slot->location, drc_name);
 	slot->power_domain = power_domain;
 	slot->hotplug_slot->private = slot;
 	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
 	slot->hotplug_slot->release = &rpaphp_release_slot;

 	return (slot);

 error_name:
 	kfree(slot->hotplug_slot->name);
 error_info:
 	kfree(slot->hotplug_slot->info);
 error_hpslot:
 	kfree(slot->hotplug_slot);
 error_slot:
 	kfree(slot);
 error_nomem:
 	return NULL;
 }

 static int is_registered(struct slot *slot)
 {
 	struct slot             *tmp_slot;

 	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
 		if (!strcmp(tmp_slot->name, slot->name))
 			return 1;
 	}
 	return 0;
 }

 int deregister_slot(struct slot *slot)
 {
 	int retval = 0;
 	struct hotplug_slot *php_slot = slot->hotplug_slot;

 	 dbg("%s - Entry: deregistering slot=%s\n",
 		__FUNCTION__, slot->name);

 	list_del(&slot->rpaphp_slot_list);

 	/* remove "phy_location" file */
 	rpaphp_sysfs_remove_attr_location(php_slot);

 	/* remove "phy_removable" file */
 	rpaphp_sysfs_remove_attr_removable(php_slot);

 	retval = pci_hp_deregister(php_slot);
 	if (retval)
 		err("Problem unregistering a slot %s\n", slot->name);
 	else
 		num_slots--;

 	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
 	return retval;
 }

 int register_slot(struct slot *slot)
 {
 	int retval;

 	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
 		__FUNCTION__, slot->dn->full_name, slot->index, slot->name,
 		slot->power_domain, slot->type);
 	/* should not try to register the same slot twice */
 	if (is_registered(slot)) { /* should't be here */
 		err("register_slot: slot[%s] is already registered\n", slot->name);
 		rpaphp_release_slot(slot->hotplug_slot);
 		return -EAGAIN;
 	}
 	retval = pci_hp_register(slot->hotplug_slot);
 	if (retval) {
 		err("pci_hp_register failed with error %d\n", retval);
 		rpaphp_release_slot(slot->hotplug_slot);
 		return retval;
 	}

 	/* create "phy_locatoin" file */
 	rpaphp_sysfs_add_attr_location(slot->hotplug_slot);

 	/* create "phy_removable" file */
 	rpaphp_sysfs_add_attr_removable(slot->hotplug_slot);

 	/* add slot to our internal list */
 	dbg("%s adding slot[%s] to rpaphp_slot_list\n",
 	    __FUNCTION__, slot->name);

 	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
 	info("Slot [%s](PCI location=%s) registered\n", slot->name,
 			slot->location);
 	num_slots++;
 	return 0;
 }

 int rpaphp_get_power_status(struct slot *slot, u8 * value)
 {
 	int rc = 0, level;

 	if (slot->type == HOTPLUG) {
 		rc = rtas_get_power_level(slot->power_domain, &level);
 		if (!rc) {
 			dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
 				__FUNCTION__, slot->name, slot->power_domain, level);
 			*value = level;
 		} else
 			err("failed to get power-level for slot(%s), rc=0x%x\n",
 				slot->location, rc);
 	} else {
 		dbg("%s report POWER_ON for EMBEDDED or PHB slot %s\n",
 			__FUNCTION__, slot->location);
 		*value = (u8) POWER_ON;
 	}

 	return rc;
 }

 int rpaphp_set_attention_status(struct slot *slot, u8 status)
 {
 	int rc;

 	/* status: LED_OFF or LED_ON */
 	rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
 	if (rc < 0)
 		err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
 		    slot->name, slot->location, slot->index, status, rc);

 	return rc;
 }
	/*
	* RPA Virtual I/O device functions
	* Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
	*
	* 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 <lxie@us.ibm.com>
	*
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/kobject.h>
	#include <linux/sysfs.h>
	#include <linux/pci.h>
	#include <asm/rtas.h>
	#include "rpaphp.h"

	static ssize_t removable_read_file (struct hotplug_slot php_slot, char buf)
	{
	u8 value;
	int retval = -ENOENT;
	struct slot slot = (struct slot )php_slot->private;

	if (!slot)
	return retval;

	value = slot->removable;
	retval = sprintf (buf, "%d\n", value);
	return retval;
	}

	static struct hotplug_slot_attribute hotplug_slot_attr_removable = {
	.attr = {.name = "phy_removable", .mode = S_IFREG \| S_IRUGO},
	.show = removable_read_file,
	};

	static void rpaphp_sysfs_add_attr_removable (struct hotplug_slot *slot)
	{
	sysfs_create_file(&slot->kobj, &hotplug_slot_attr_removable.attr);
	}

	static void rpaphp_sysfs_remove_attr_removable (struct hotplug_slot *slot)
	{
	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_removable.attr);
	}

	static ssize_t location_read_file (struct hotplug_slot php_slot, char buf)
	{
	char *value;
	int retval = -ENOENT;
	struct slot slot = (struct slot )php_slot->private;

	if (!slot)
	return retval;

	value = slot->location;
	retval = sprintf (buf, "%s\n", value);
	return retval;
	}

	static struct hotplug_slot_attribute hotplug_slot_attr_location = {
	.attr = {.name = "phy_location", .mode = S_IFREG \| S_IRUGO},
	.show = location_read_file,
	};

	static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
	{
	sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
	}

	static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
	{
	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
	}

	/* free up the memory used by a slot */
	static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
	{
	struct slot slot = (struct slot ) hotplug_slot->private;

	dealloc_slot_struct(slot);
	}

	void dealloc_slot_struct(struct slot *slot)
	{
	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot->name);
	kfree(slot->hotplug_slot);
	kfree(slot);
	return;
	}

	struct slot alloc_slot_struct(struct device_node dn, int drc_index, char *drc_name,
	int power_domain)
	{
	struct slot *slot;

	slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
	if (!slot)
	goto error_nomem;
	memset(slot, 0, sizeof (struct slot));
	slot->hotplug_slot = kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
	if (!slot->hotplug_slot)
	goto error_slot;
	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)
	goto error_hpslot;
	memset(slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
	slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
	if (!slot->hotplug_slot->name)
	goto error_info;
	slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
	if (!slot->location)
	goto error_name;
	slot->name = slot->hotplug_slot->name;
	slot->dn = dn;
	slot->index = drc_index;
	strcpy(slot->location, drc_name);
	slot->power_domain = power_domain;
	slot->hotplug_slot->private = slot;
	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
	slot->hotplug_slot->release = &rpaphp_release_slot;

	return (slot);

	error_name:
	kfree(slot->hotplug_slot->name);
	error_info:
	kfree(slot->hotplug_slot->info);
	error_hpslot:
	kfree(slot->hotplug_slot);
	error_slot:
	kfree(slot);
	error_nomem:
	return NULL;
	}

	static int is_registered(struct slot *slot)
	{
	struct slot *tmp_slot;

	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
	if (!strcmp(tmp_slot->name, slot->name))
	return 1;
	}
	return 0;
	}

	int deregister_slot(struct slot *slot)
	{
	int retval = 0;
	struct hotplug_slot *php_slot = slot->hotplug_slot;

	dbg("%s - Entry: deregistering slot=%s\n",
	__FUNCTION__, slot->name);

	list_del(&slot->rpaphp_slot_list);

	/* remove "phy_location" file */
	rpaphp_sysfs_remove_attr_location(php_slot);

	/* remove "phy_removable" file */
	rpaphp_sysfs_remove_attr_removable(php_slot);

	retval = pci_hp_deregister(php_slot);
	if (retval)
	err("Problem unregistering a slot %s\n", slot->name);
	else
	num_slots--;

	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
	return retval;
	}

	int register_slot(struct slot *slot)
	{
	int retval;

	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
	__FUNCTION__, slot->dn->full_name, slot->index, slot->name,
	slot->power_domain, slot->type);
	/* should not try to register the same slot twice */
	if (is_registered(slot)) { /* should't be here */
	err("register_slot: slot[%s] is already registered\n", slot->name);
	rpaphp_release_slot(slot->hotplug_slot);
	return -EAGAIN;
	}
	retval = pci_hp_register(slot->hotplug_slot);
	if (retval) {
	err("pci_hp_register failed with error %d\n", retval);
	rpaphp_release_slot(slot->hotplug_slot);
	return retval;
	}

	/* create "phy_locatoin" file */
	rpaphp_sysfs_add_attr_location(slot->hotplug_slot);

	/* create "phy_removable" file */
	rpaphp_sysfs_add_attr_removable(slot->hotplug_slot);

	/* add slot to our internal list */
	dbg("%s adding slot[%s] to rpaphp_slot_list\n",
	__FUNCTION__, slot->name);

	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
	info("Slot [%s](PCI location=%s) registered\n", slot->name,
	slot->location);
	num_slots++;
	return 0;
	}

	int rpaphp_get_power_status(struct slot slot, u8 value)
	{
	int rc = 0, level;

	if (slot->type == HOTPLUG) {
	rc = rtas_get_power_level(slot->power_domain, &level);
	if (!rc) {
	dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
	__FUNCTION__, slot->name, slot->power_domain, level);
	*value = level;
	} else
	err("failed to get power-level for slot(%s), rc=0x%x\n",
	slot->location, rc);
	} else {
	dbg("%s report POWER_ON for EMBEDDED or PHB slot %s\n",
	__FUNCTION__, slot->location);
	*value = (u8) POWER_ON;
	}

	return rc;
	}

	int rpaphp_set_attention_status(struct slot *slot, u8 status)
	{
	int rc;

	/* status: LED_OFF or LED_ON */
	rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
	if (rc < 0)
	err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
	slot->name, slot->location, slot->index, status, rc);

	return rc;
	}