drivers/net/bnx2_fw.h


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/* bnx2_fw.h: Broadcom NX2 network driver.
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Broadcom Corporation
 *
 * 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.
 */

/* Initialized Values for the Completion Processor. */
static const struct cpu_reg cpu_reg_com = {
	.mode = BNX2_COM_CPU_MODE,
	.mode_value_halt = BNX2_COM_CPU_MODE_SOFT_HALT,
	.mode_value_sstep = BNX2_COM_CPU_MODE_STEP_ENA,
	.state = BNX2_COM_CPU_STATE,
	.state_value_clear = 0xffffff,
	.gpr0 = BNX2_COM_CPU_REG_FILE,
	.evmask = BNX2_COM_CPU_EVENT_MASK,
	.pc = BNX2_COM_CPU_PROGRAM_COUNTER,
	.inst = BNX2_COM_CPU_INSTRUCTION,
	.bp = BNX2_COM_CPU_HW_BREAKPOINT,
	.spad_base = BNX2_COM_SCRATCH,
	.mips_view_base = 0x8000000,
};

/* Initialized Values the Command Processor. */
static const struct cpu_reg cpu_reg_cp = {
	.mode = BNX2_CP_CPU_MODE,
	.mode_value_halt = BNX2_CP_CPU_MODE_SOFT_HALT,
	.mode_value_sstep = BNX2_CP_CPU_MODE_STEP_ENA,
	.state = BNX2_CP_CPU_STATE,
	.state_value_clear = 0xffffff,
	.gpr0 = BNX2_CP_CPU_REG_FILE,
	.evmask = BNX2_CP_CPU_EVENT_MASK,
	.pc = BNX2_CP_CPU_PROGRAM_COUNTER,
	.inst = BNX2_CP_CPU_INSTRUCTION,
	.bp = BNX2_CP_CPU_HW_BREAKPOINT,
	.spad_base = BNX2_CP_SCRATCH,
	.mips_view_base = 0x8000000,
};

/* Initialized Values for the RX Processor. */
static const struct cpu_reg cpu_reg_rxp = {
	.mode = BNX2_RXP_CPU_MODE,
	.mode_value_halt = BNX2_RXP_CPU_MODE_SOFT_HALT,
	.mode_value_sstep = BNX2_RXP_CPU_MODE_STEP_ENA,
	.state = BNX2_RXP_CPU_STATE,
	.state_value_clear = 0xffffff,
	.gpr0 = BNX2_RXP_CPU_REG_FILE,
	.evmask = BNX2_RXP_CPU_EVENT_MASK,
	.pc = BNX2_RXP_CPU_PROGRAM_COUNTER,
	.inst = BNX2_RXP_CPU_INSTRUCTION,
	.bp = BNX2_RXP_CPU_HW_BREAKPOINT,
	.spad_base = BNX2_RXP_SCRATCH,
	.mips_view_base = 0x8000000,
};

/* Initialized Values for the TX Patch-up Processor. */
static const struct cpu_reg cpu_reg_tpat = {
	.mode = BNX2_TPAT_CPU_MODE,
	.mode_value_halt = BNX2_TPAT_CPU_MODE_SOFT_HALT,
	.mode_value_sstep = BNX2_TPAT_CPU_MODE_STEP_ENA,
	.state = BNX2_TPAT_CPU_STATE,
	.state_value_clear = 0xffffff,
	.gpr0 = BNX2_TPAT_CPU_REG_FILE,
	.evmask = BNX2_TPAT_CPU_EVENT_MASK,
	.pc = BNX2_TPAT_CPU_PROGRAM_COUNTER,
	.inst = BNX2_TPAT_CPU_INSTRUCTION,
	.bp = BNX2_TPAT_CPU_HW_BREAKPOINT,
	.spad_base = BNX2_TPAT_SCRATCH,
	.mips_view_base = 0x8000000,
};

/* Initialized Values for the TX Processor. */
static const struct cpu_reg cpu_reg_txp = {
	.mode = BNX2_TXP_CPU_MODE,
	.mode_value_halt = BNX2_TXP_CPU_MODE_SOFT_HALT,
	.mode_value_sstep = BNX2_TXP_CPU_MODE_STEP_ENA,
	.state = BNX2_TXP_CPU_STATE,
	.state_value_clear = 0xffffff,
	.gpr0 = BNX2_TXP_CPU_REG_FILE,
	.evmask = BNX2_TXP_CPU_EVENT_MASK,
	.pc = BNX2_TXP_CPU_PROGRAM_COUNTER,
	.inst = BNX2_TXP_CPU_INSTRUCTION,
	.bp = BNX2_TXP_CPU_HW_BREAKPOINT,
	.spad_base = BNX2_TXP_SCRATCH,
	.mips_view_base = 0x8000000,
};
/*
 *	w1.c
 *
 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 *
 *
 * 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.  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/freezer.h>

#include <asm/atomic.h>

#include "w1.h"
#include "w1_log.h"
#include "w1_int.h"
#include "w1_family.h"
#include "w1_netlink.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");

static int w1_timeout = 10;
int w1_max_slave_count = 10;
int w1_max_slave_ttl = 10;

module_param_named(timeout, w1_timeout, int, 0);
module_param_named(max_slave_count, w1_max_slave_count, int, 0);
module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);

DEFINE_MUTEX(w1_mlock);
LIST_HEAD(w1_masters);

static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);

static int w1_master_match(struct device *dev, struct device_driver *drv)
{
	return 1;
}

static int w1_master_probe(struct device *dev)
{
	return -ENODEV;
}

static void w1_master_release(struct device *dev)
{
	struct w1_master *md = dev_to_w1_master(dev);

	dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
	memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
	kfree(md);
}

static void w1_slave_release(struct device *dev)
{
	struct w1_slave *sl = dev_to_w1_slave(dev);

	dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);

	while (atomic_read(&sl->refcnt)) {
		dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
				sl->name, atomic_read(&sl->refcnt));
		if (msleep_interruptible(1000))
			flush_signals(current);
	}

	w1_family_put(sl->family);
	sl->master->slave_count--;

	complete(&sl->released);
}

static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w1_slave *sl = dev_to_w1_slave(dev);

	return sprintf(buf, "%s\n", sl->name);
}

static ssize_t w1_slave_read_id(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct w1_slave *sl = dev_to_w1_slave(dev);
	ssize_t count = sizeof(sl->reg_num);

	memcpy(buf, (u8 *)&sl->reg_num, count);
	return count;
}

static struct device_attribute w1_slave_attr_name =
	__ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
static struct device_attribute w1_slave_attr_id =
	__ATTR(id, S_IRUGO, w1_slave_read_id, NULL);

/* Default family */

static ssize_t w1_default_write(struct kobject *kobj,
				struct bin_attribute *bin_attr,
				char *buf, loff_t off, size_t count)
{
	struct w1_slave *sl = kobj_to_w1_slave(kobj);

	mutex_lock(&sl->master->mutex);
	if (w1_reset_select_slave(sl)) {
		count = 0;
		goto out_up;
	}

	w1_write_block(sl->master, buf, count);

out_up:
	mutex_unlock(&sl->master->mutex);
	return count;
}

static ssize_t w1_default_read(struct kobject *kobj,
			       struct bin_attribute *bin_attr,
			       char *buf, loff_t off, size_t count)
{
	struct w1_slave *sl = kobj_to_w1_slave(kobj);

	mutex_lock(&sl->master->mutex);
	w1_read_block(sl->master, buf, count);
	mutex_unlock(&sl->master->mutex);
	return count;
}

static struct bin_attribute w1_default_attr = {
      .attr = {
              .name = "rw",
              .mode = S_IRUGO | S_IWUSR,
      },
      .size = PAGE_SIZE,
      .read = w1_default_read,
      .write = w1_default_write,
};

static int w1_default_add_slave(struct w1_slave *sl)
{
	return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
}

static void w1_default_remove_slave(struct w1_slave *sl)
{
	sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
}

static struct w1_family_ops w1_default_fops = {
	.add_slave	= w1_default_add_slave,
	.remove_slave	= w1_default_remove_slave,
};

static struct w1_family w1_default_family = {
	.fops = &w1_default_fops,
};

static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);

static struct bus_type w1_bus_type = {
	.name = "w1",
	.match = w1_master_match,
	.uevent = w1_uevent,
};

struct device_driver w1_master_driver = {
	.name = "w1_master_driver",
	.bus = &w1_bus_type,
	.probe = w1_master_probe,
};

struct device w1_master_device = {
	.parent = NULL,
	.bus = &w1_bus_type,
	.init_name = "w1 bus master",
	.driver = &w1_master_driver,
	.release = &w1_master_release
};

static struct device_driver w1_slave_driver = {
	.name = "w1_slave_driver",
	.bus = &w1_bus_type,
};

#if 0
struct device w1_slave_device = {
	.parent = NULL,
	.bus = &w1_bus_type,
	.init_name = "w1 bus slave",
	.driver = &w1_slave_driver,
	.release = &w1_slave_release
};
#endif  /*  0  */

static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "%s\n", md->name);
	mutex_unlock(&md->mutex);

	return count;
}

static ssize_t w1_master_attribute_store_search(struct device * dev,
						struct device_attribute *attr,
						const char * buf, size_t count)
{
	long tmp;
	struct w1_master *md = dev_to_w1_master(dev);

	if (strict_strtol(buf, 0, &tmp) == -EINVAL)
		return -EINVAL;

	mutex_lock(&md->mutex);
	md->search_count = tmp;
	mutex_unlock(&md->mutex);
	wake_up_process(md->thread);

	return count;
}

static ssize_t w1_master_attribute_show_search(struct device *dev,
					       struct device_attribute *attr,
					       char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "%d\n", md->search_count);
	mutex_unlock(&md->mutex);

	return count;
}

static ssize_t w1_master_attribute_store_pullup(struct device *dev,
						struct device_attribute *attr,
						const char *buf, size_t count)
{
	long tmp;
	struct w1_master *md = dev_to_w1_master(dev);

	if (strict_strtol(buf, 0, &tmp) == -EINVAL)
		return -EINVAL;

	mutex_lock(&md->mutex);
	md->enable_pullup = tmp;
	mutex_unlock(&md->mutex);
	wake_up_process(md->thread);

	return count;
}

static ssize_t w1_master_attribute_show_pullup(struct device *dev,
					       struct device_attribute *attr,
					       char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "%d\n", md->enable_pullup);
	mutex_unlock(&md->mutex);

	return count;
}

static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "0x%p\n", md->bus_master);
	mutex_unlock(&md->mutex);
	return count;
}

static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t count;
	count = sprintf(buf, "%d\n", w1_timeout);
	return count;
}

static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "%d\n", md->max_slave_count);
	mutex_unlock(&md->mutex);
	return count;
}

static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "%lu\n", md->attempts);
	mutex_unlock(&md->mutex);
	return count;
}

static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	ssize_t count;

	mutex_lock(&md->mutex);
	count = sprintf(buf, "%d\n", md->slave_count);
	mutex_unlock(&md->mutex);
	return count;
}

static ssize_t w1_master_attribute_show_slaves(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct w1_master *md = dev_to_w1_master(dev);
	int c = PAGE_SIZE;

	mutex_lock(&md->mutex);

	if (md->slave_count == 0)
		c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
	else {
		struct list_head *ent, *n;
		struct w1_slave *sl;

		list_for_each_safe(ent, n, &md->slist) {
			sl = list_entry(ent, struct w1_slave, w1_slave_entry);

			c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
		}
	}

	mutex_unlock(&md->mutex);

	return PAGE_SIZE - c;
}

static ssize_t w1_master_attribute_show_add(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	int c = PAGE_SIZE;
	c -= snprintf(buf+PAGE_SIZE - c, c,
		"write device id xx-xxxxxxxxxxxx to add slave\n");
	return PAGE_SIZE - c;
}

static int w1_atoreg_num(struct device *dev, const char *buf, size_t count,
	struct w1_reg_num *rn)
{
	unsigned int family;
	unsigned long long id;
	int i;
	u64 rn64_le;

	/* The CRC value isn't read from the user because the sysfs directory
	 * doesn't include it and most messages from the bus search don't
	 * print it either.  It would be unreasonable for the user to then
	 * provide it.
	 */
	const char *error_msg = "bad slave string format, expecting "
		"ff-dddddddddddd\n";

	if (buf[2] != '-') {
		dev_err(dev, "%s", error_msg);
		return -EINVAL;
	}
	i = sscanf(buf, "%02x-%012llx", &family, &id);
	if (i != 2) {
		dev_err(dev, "%s", error_msg);
		return -EINVAL;
	}
	rn->family = family;
	rn->id = id;

	rn64_le = cpu_to_le64(*(u64 *)rn);
	rn->crc = w1_calc_crc8((u8 *)&rn64_le, 7);

#if 0
	dev_info(dev, "With CRC device is %02x.%012llx.%02x.\n",
		  rn->family, (unsigned long long)rn->id, rn->crc);
#endif

	return 0;
}

/* Searches the slaves in the w1_master and returns a pointer or NULL.
 * Note: must hold the mutex
 */
static struct w1_slave *w1_slave_search_device(struct w1_master *dev,
	struct w1_reg_num *rn)
{
	struct w1_slave *sl;
	list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
		if (sl->reg_num.family == rn->family &&
				sl->reg_num.id == rn->id &&
				sl->reg_num.crc == rn->crc) {
			return sl;
		}
	}
	return NULL;
}

static ssize_t w1_master_attribute_store_add(struct device *dev,
						struct device_attribute *attr,
						const char *buf, size_t count)
{
	struct w1_master *md = dev_to_w1_master(dev);
	struct w1_reg_num rn;
	struct w1_slave *sl;
	ssize_t result = count;

	if (w1_atoreg_num(dev, buf, count, &rn))
		return -EINVAL;

	mutex_lock(&md->mutex);
	sl = w1_slave_search_device(md, &rn);
	/* It would be nice to do a targeted search one the one-wire bus
	 * for the new device to see if it is out there or not.  But the
	 * current search doesn't support that.
	 */
	if (sl) {
		dev_info(dev, "Device %s already exists\n", sl->name);
		result = -EINVAL;
	} else {
		w1_attach_slave_device(md, &rn);
	}
	mutex_unlock(&md->mutex);

	return result;
}

static ssize_t w1_master_attribute_show_remove(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	int c = PAGE_SIZE;
	c -= snprintf(buf+PAGE_SIZE - c, c,
		"write device id xx-xxxxxxxxxxxx to remove slave\n");
	return PAGE_SIZE - c;
}

static ssize_t w1_master_attribute_store_remove(struct device *dev,
						struct device_attribute *attr,
						const char *buf, size_t count)
{
	struct w1_master *md = dev_to_w1_master(dev);
	struct w1_reg_num rn;
	struct w1_slave *sl;
	ssize_t result = count;

	if (w1_atoreg_num(dev, buf, count, &rn))
		return -EINVAL;

	mutex_lock(&md->mutex);
	sl = w1_slave_search_device(md, &rn);
	if (sl) {
		w1_slave_detach(sl);
	} else {
		dev_info(dev, "Device %02x-%012llx doesn't exists\n", rn.family,
			(unsigned long long)rn.id);
		result = -EINVAL;
	}
	mutex_unlock(&md->mutex);

	return result;
}

#define W1_MASTER_ATTR_RO(_name, _mode)				\
	struct device_attribute w1_master_attribute_##_name =	\
		__ATTR(w1_master_##_name, _mode,		\
		       w1_master_attribute_show_##_name, NULL)

#define W1_MASTER_ATTR_RW(_name, _mode)				\
	struct device_attribute w1_master_attribute_##_name =	\
		__ATTR(w1_master_##_name, _mode,		\
		       w1_master_attribute_show_##_name,	\
		       w1_master_attribute_store_##_name)

static W1_MASTER_ATTR_RO(name, S_IRUGO);
static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUGO);
static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUGO);
static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUGO);

static struct attribute *w1_master_default_attrs[] = {
	&w1_master_attribute_name.attr,
	&w1_master_attribute_slaves.attr,
	&w1_master_attribute_slave_count.attr,
	&w1_master_attribute_max_slave_count.attr,
	&w1_master_attribute_attempts.attr,
	&w1_master_attribute_timeout.attr,
	&w1_master_attribute_pointer.attr,
	&w1_master_attribute_search.attr,
	&w1_master_attribute_pullup.attr,
	&w1_master_attribute_add.attr,
	&w1_master_attribute_remove.attr,
	NULL
};

static struct attribute_group w1_master_defattr_group = {
	.attrs = w1_master_default_attrs,
};

int w1_create_master_attributes(struct w1_master *master)
{
	return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
}

void w1_destroy_master_attributes(struct w1_master *master)
{
	sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
}

#ifdef CONFIG_HOTPLUG
static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct w1_master *md = NULL;
	struct w1_slave *sl = NULL;
	char *event_owner, *name;
	int err;

	if (dev->driver == &w1_master_driver) {
		md = container_of(dev, struct w1_master, dev);
		event_owner = "master";
		name = md->name;
	} else if (dev->driver == &w1_slave_driver) {
		sl = container_of(dev, struct w1_slave, dev);
		event_owner = "slave";
		name = sl->name;
	} else {
		dev_dbg(dev, "Unknown event.\n");
		return -EINVAL;
	}

	dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
			event_owner, name, dev_name(dev));

	if (dev->driver != &w1_slave_driver || !sl)
		return 0;

	err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
	if (err)
		return err;

	err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
			     (unsigned long long)sl->reg_num.id);
	if (err)
		return err;

	return 0;
};
#else
static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return 0;
}
#endif

static int __w1_attach_slave_device(struct w1_slave *sl)
{
	int err;

	sl->dev.parent = &sl->master->dev;
	sl->dev.driver = &w1_slave_driver;
	sl->dev.bus = &w1_bus_type;
	sl->dev.release = &w1_slave_release;

	dev_set_name(&sl->dev, "%02x-%012llx",
		 (unsigned int) sl->reg_num.family,
		 (unsigned long long) sl->reg_num.id);
	snprintf(&sl->name[0], sizeof(sl->name),
		 "%02x-%012llx",
		 (unsigned int) sl->reg_num.family,
		 (unsigned long long) sl->reg_num.id);

	dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
		dev_name(&sl->dev), sl);

	err = device_register(&sl->dev);
	if (err < 0) {
		dev_err(&sl->dev,
			"Device registration [%s] failed. err=%d\n",
			dev_name(&sl->dev), err);
		return err;
	}

	/* Create "name" entry */
	err = device_create_file(&sl->dev, &w1_slave_attr_name);
	if (err < 0) {
		dev_err(&sl->dev,
			"sysfs file creation for [%s] failed. err=%d\n",
			dev_name(&sl->dev), err);
		goto out_unreg;
	}

	/* Create "id" entry */
	err = device_create_file(&sl->dev, &w1_slave_attr_id);
	if (err < 0) {
		dev_err(&sl->dev,
			"sysfs file creation for [%s] failed. err=%d\n",
			dev_name(&sl->dev), err);
		goto out_rem1;
	}

	/* if the family driver needs to initialize something... */
	if (sl->family->fops && sl->family->fops->add_slave &&
	    ((err = sl->family->fops->add_slave(sl)) < 0)) {
		dev_err(&sl->dev,
			"sysfs file creation for [%s] failed. err=%d\n",
			dev_name(&sl->dev), err);
		goto out_rem2;
	}

	list_add_tail(&sl->w1_slave_entry, &sl->master->slist);

	return 0;

out_rem2:
	device_remove_file(&sl->dev, &w1_slave_attr_id);
out_rem1:
	device_remove_file(&sl->dev, &w1_slave_attr_name);
out_unreg:
	device_unregister(&sl->dev);
	return err;
}

static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
{
	struct w1_slave *sl;
	struct w1_family *f;
	int err;
	struct w1_netlink_msg msg;

	sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
	if (!sl) {
		dev_err(&dev->dev,
			 "%s: failed to allocate new slave device.\n",
			 __func__);
		return -ENOMEM;
	}


	sl->owner = THIS_MODULE;
	sl->master = dev;
	set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);

	memset(&msg, 0, sizeof(msg));
	memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
	atomic_set(&sl->refcnt, 0);
	init_completion(&sl->released);

	spin_lock(&w1_flock);
	f = w1_family_registered(rn->family);
	if (!f) {
		f= &w1_default_family;
		dev_info(&dev->dev, "Family %x for %02x.%012llx.%02x is not registered.\n",
			  rn->family, rn->family,
			  (unsigned long long)rn->id, rn->crc);
	}
	__w1_family_get(f);
	spin_unlock(&w1_flock);

	sl->family = f;


	err = __w1_attach_slave_device(sl);
	if (err < 0) {
		dev_err(&dev->dev, "%s: Attaching %s failed.\n", __func__,
			 sl->name);
		w1_family_put(sl->family);
		kfree(sl);
		return err;
	}

	sl->ttl = dev->slave_ttl;
	dev->slave_count++;

	memcpy(msg.id.id, rn, sizeof(msg.id));
	msg.type = W1_SLAVE_ADD;
	w1_netlink_send(dev, &msg);

	return 0;
}

void w1_slave_detach(struct w1_slave *sl)
{
	struct w1_netlink_msg msg;

	dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);

	list_del(&sl->w1_slave_entry);

	if (sl->family->fops && sl->family->fops->remove_slave)
		sl->family->fops->remove_slave(sl);

	memset(&msg, 0, sizeof(msg));