[mirror_ubuntu-zesty-kernel.git] / drivers / pci / hotplug / rpaphp_slot.c

/*
 * 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 <linux/string.h>
#include <linux/slab.h>

#include <asm/rtas.h>
#include "rpaphp.h"

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 php_attr_location = {
	.attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
	.show = location_read_file,
};

/* 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->location);
	kfree(slot);
}

struct slot *alloc_slot_struct(struct device_node *dn,
                       int drc_index, char *drc_name, int power_domain)
{
	struct slot *slot;
	
	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
	if (!slot)
		goto error_nomem;
	slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
	if (!slot->hotplug_slot)
		goto error_slot;	
	slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
					   GFP_KERNEL);
	if (!slot->hotplug_slot->info)
		goto error_hpslot;
	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 rpaphp_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 */
	sysfs_remove_file(&php_slot->kobj, &php_attr_location.attr);

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

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

int rpaphp_register_slot(struct slot *slot)
{
	struct hotplug_slot *php_slot = slot->hotplug_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)) {
		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
		retval = -EAGAIN;
		goto register_fail;
	}	

	retval = pci_hp_register(php_slot);
	if (retval) {
		err("pci_hp_register failed with error %d\n", retval);
		goto register_fail;
	}

	/* create "phy_location" file */
	retval = sysfs_create_file(&php_slot->kobj, &php_attr_location.attr);
	if (retval) {
		err("sysfs_create_file failed with error %d\n", retval);
		goto sysfs_fail;
	}

	/* add slot to our internal list */
	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
	info("Slot [%s](PCI location=%s) registered\n", slot->name,
			slot->location);
	return 0;

sysfs_fail:
	pci_hp_deregister(php_slot);
register_fail:
	return retval;
}

int rpaphp_get_power_status(struct slot *slot, u8 * value)
{
	int rc = 0, level;
	
	rc = rtas_get_power_level(slot->power_domain, &level);
	if (rc < 0) {
		err("failed to get power-level for slot(%s), rc=0x%x\n",
			slot->location, rc);
		return 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;

	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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* RPA Virtual I/O device functions
	3	* Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
	4	*
	5	* All rights reserved.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or (at
	10	* your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	15	* NON INFRINGEMENT. See the GNU General Public License for more
	16	* details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*
	22	* Send feedback to <lxie@us.ibm.com>
	23	*
	24	*/
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/kobject.h>
	28	#include <linux/sysfs.h>
	29	#include <linux/pci.h>
4e57b681 TS	30	#include <linux/string.h>
	31	#include <linux/slab.h>
	32
1da177e4 LT	33	#include <asm/rtas.h>
	34	#include "rpaphp.h"
	35
1da177e4 LT	36	static ssize_t location_read_file (struct hotplug_slot php_slot, char buf)
1da177e4 LT	37	{
f6afbad8 LV	38	char *value;
f6afbad8 LV	39	int retval = -ENOENT;
1da177e4 LT	40	struct slot slot = (struct slot )php_slot->private;
	41
	42	if (!slot)
	43	return retval;
	44
f6afbad8 LV	45	value = slot->location;
	46	retval = sprintf (buf, "%s\n", value);
	47	return retval;
1da177e4 LT	48	}
1da177e4 LT	49
f1e79092	50	static struct hotplug_slot_attribute php_attr_location = {
1da177e4 LT	51	.attr = {.name = "phy_location", .mode = S_IFREG \| S_IRUGO},
	52	.show = location_read_file,
	53	};
	54
1da177e4 LT	55	/* free up the memory used by a slot */
	56	static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
	57	{
	58	struct slot slot = (struct slot ) hotplug_slot->private;
1da177e4 LT	59	dealloc_slot_struct(slot);
	60	}
	61
	62	void dealloc_slot_struct(struct slot *slot)
	63	{
	64	kfree(slot->hotplug_slot->info);
	65	kfree(slot->hotplug_slot->name);
	66	kfree(slot->hotplug_slot);
5fd39c35	67	kfree(slot->location);
1da177e4	68	kfree(slot);
1da177e4 LT	69	}
1da177e4 LT	70
5fd39c35 LV	71	struct slot alloc_slot_struct(struct device_node dn,
5fd39c35 LV	72	int drc_index, char *drc_name, int power_domain)
1da177e4 LT	73	{
	74	struct slot *slot;
	75
f5afe806	76	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
1da177e4 LT	77	if (!slot)
1da177e4 LT	78	goto error_nomem;
f5afe806	79	slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
1da177e4 LT	80	if (!slot->hotplug_slot)
1da177e4 LT	81	goto error_slot;
f5afe806	82	slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
1da177e4 LT	83	GFP_KERNEL);
	84	if (!slot->hotplug_slot->info)
	85	goto error_hpslot;
1da177e4 LT	86	slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
	87	if (!slot->hotplug_slot->name)
	88	goto error_info;
	89	slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
	90	if (!slot->location)
	91	goto error_name;
	92	slot->name = slot->hotplug_slot->name;
	93	slot->dn = dn;
	94	slot->index = drc_index;
	95	strcpy(slot->location, drc_name);
	96	slot->power_domain = power_domain;
	97	slot->hotplug_slot->private = slot;
	98	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
	99	slot->hotplug_slot->release = &rpaphp_release_slot;
	100
	101	return (slot);
	102
	103	error_name:
	104	kfree(slot->hotplug_slot->name);
	105	error_info:
	106	kfree(slot->hotplug_slot->info);
	107	error_hpslot:
	108	kfree(slot->hotplug_slot);
	109	error_slot:
	110	kfree(slot);
	111	error_nomem:
	112	return NULL;
	113	}
	114
	115	static int is_registered(struct slot *slot)
	116	{
5fd39c35	117	struct slot *tmp_slot;
1da177e4 LT	118
	119	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
	120	if (!strcmp(tmp_slot->name, slot->name))
	121	return 1;
	122	}
	123	return 0;
	124	}
	125
f6afbad8	126	int rpaphp_deregister_slot(struct slot *slot)
1da177e4 LT	127	{
	128	int retval = 0;
	129	struct hotplug_slot *php_slot = slot->hotplug_slot;
	130
	131	dbg("%s - Entry: deregistering slot=%s\n",
	132	__FUNCTION__, slot->name);
	133
	134	list_del(&slot->rpaphp_slot_list);
	135
	136	/* remove "phy_location" file */
f1e79092	137	sysfs_remove_file(&php_slot->kobj, &php_attr_location.attr);
1da177e4	138
1da177e4 LT	139	retval = pci_hp_deregister(php_slot);
	140	if (retval)
	141	err("Problem unregistering a slot %s\n", slot->name);
1da177e4 LT	142
	143	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
	144	return retval;
	145	}
61ee9cd5	146	EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
1da177e4	147
f6afbad8	148	int rpaphp_register_slot(struct slot *slot)
1da177e4	149	{
f1e79092	150	struct hotplug_slot *php_slot = slot->hotplug_slot;
1da177e4 LT	151	int retval;
	152
	153	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
	154	__FUNCTION__, slot->dn->full_name, slot->index, slot->name,
	155	slot->power_domain, slot->type);
f1e79092	156
1da177e4	157	/* should not try to register the same slot twice */
f1e79092	158	if (is_registered(slot)) {
f6afbad8	159	err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
f1e79092 LV	160	retval = -EAGAIN;
f1e79092 LV	161	goto register_fail;
1da177e4	162	}
f1e79092 LV	163
f1e79092 LV	164	retval = pci_hp_register(php_slot);
1da177e4 LT	165	if (retval) {
1da177e4 LT	166	err("pci_hp_register failed with error %d\n", retval);
f1e79092	167	goto register_fail;
1da177e4	168	}
1da177e4	169
f1e79092 LV	170	/* create "phy_location" file */
	171	retval = sysfs_create_file(&php_slot->kobj, &php_attr_location.attr);
	172	if (retval) {
	173	err("sysfs_create_file failed with error %d\n", retval);
	174	goto sysfs_fail;
	175	}
1da177e4	176
f1e79092	177	/* add slot to our internal list */
1da177e4	178	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
5eeb8c63 JR	179	info("Slot [%s](PCI location=%s) registered\n", slot->name,
5eeb8c63 JR	180	slot->location);
1da177e4	181	return 0;
f1e79092 LV	182
	183	sysfs_fail:
	184	pci_hp_deregister(php_slot);
	185	register_fail:
f1e79092	186	return retval;
1da177e4 LT	187	}
	188
	189	int rpaphp_get_power_status(struct slot slot, u8 value)
	190	{
	191	int rc = 0, level;
	192
56d8456b JR	193	rc = rtas_get_power_level(slot->power_domain, &level);
	194	if (rc < 0) {
	195	err("failed to get power-level for slot(%s), rc=0x%x\n",
	196	slot->location, rc);
	197	return rc;
1da177e4 LT	198	}
1da177e4 LT	199
56d8456b JR	200	dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
	201	__FUNCTION__, slot->name, slot->power_domain, level);
	202	*value = level;
	203
1da177e4 LT	204	return rc;
	205	}
	206
	207	int rpaphp_set_attention_status(struct slot *slot, u8 status)
	208	{
	209	int rc;
	210
	211	/* status: LED_OFF or LED_ON */
	212	rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
	213	if (rc < 0)
	214	err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
	215	slot->name, slot->location, slot->index, status, rc);
	216
	217	return rc;
	218	}