2005-04-16 22:20:36 +00:00
|
|
|
/*
|
2005-05-20 18:33:25 +00:00
|
|
|
* w1.c
|
2005-04-16 22:20:36 +00:00
|
|
|
*
|
2011-08-25 22:59:06 +00:00
|
|
|
* Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
|
2005-05-20 18:33:25 +00:00
|
|
|
*
|
2005-04-16 22:20:36 +00:00
|
|
|
*
|
|
|
|
* 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>
|
2006-02-20 08:15:37 +00:00
|
|
|
#include <linux/kthread.h>
|
2006-12-07 04:34:23 +00:00
|
|
|
#include <linux/freezer.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-07-26 23:09:06 +00:00
|
|
|
#include <linux/atomic.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#include "w1.h"
|
|
|
|
#include "w1_log.h"
|
|
|
|
#include "w1_int.h"
|
|
|
|
#include "w1_family.h"
|
|
|
|
#include "w1_netlink.h"
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
2011-08-25 22:59:06 +00:00
|
|
|
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
|
2005-04-16 22:20:36 +00:00
|
|
|
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);
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
DEFINE_MUTEX(w1_mlock);
|
2005-04-16 22:20:36 +00:00
|
|
|
LIST_HEAD(w1_masters);
|
|
|
|
|
2008-10-16 05:04:43 +00:00
|
|
|
static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
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)
|
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-08-11 13:27:50 +00:00
|
|
|
|
|
|
|
dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
|
|
|
|
memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
|
|
|
|
kfree(md);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void w1_slave_release(struct device *dev)
|
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_slave *sl = dev_to_w1_slave(dev);
|
2005-08-11 13:27:50 +00:00
|
|
|
|
2008-10-16 05:04:58 +00:00
|
|
|
dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
|
2005-08-11 13:27:50 +00:00
|
|
|
|
|
|
|
while (atomic_read(&sl->refcnt)) {
|
2008-10-16 05:04:58 +00:00
|
|
|
dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
|
2005-08-11 13:27:50 +00:00
|
|
|
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);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:50 +00:00
|
|
|
struct w1_slave *sl = dev_to_w1_slave(dev);
|
2005-08-11 13:27:50 +00:00
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
return sprintf(buf, "%s\n", sl->name);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:50 +00:00
|
|
|
static ssize_t w1_slave_read_id(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-10-16 05:04:50 +00:00
|
|
|
struct w1_slave *sl = dev_to_w1_slave(dev);
|
|
|
|
ssize_t count = sizeof(sl->reg_num);
|
2005-08-11 13:27:50 +00:00
|
|
|
|
2008-10-16 05:04:50 +00:00
|
|
|
memcpy(buf, (u8 *)&sl->reg_num, count);
|
2005-08-11 13:27:50 +00:00
|
|
|
return count;
|
2005-08-11 13:27:50 +00:00
|
|
|
}
|
2005-08-11 13:27:50 +00:00
|
|
|
|
|
|
|
static struct device_attribute w1_slave_attr_name =
|
|
|
|
__ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
|
2008-10-16 05:04:50 +00:00
|
|
|
static struct device_attribute w1_slave_attr_id =
|
|
|
|
__ATTR(id, S_IRUGO, w1_slave_read_id, NULL);
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
/* Default family */
|
2006-03-23 16:11:58 +00:00
|
|
|
|
2010-05-13 01:28:57 +00:00
|
|
|
static ssize_t w1_default_write(struct file *filp, struct kobject *kobj,
|
2007-06-09 05:57:22 +00:00
|
|
|
struct bin_attribute *bin_attr,
|
|
|
|
char *buf, loff_t off, size_t count)
|
2006-03-23 16:11:58 +00:00
|
|
|
{
|
|
|
|
struct w1_slave *sl = kobj_to_w1_slave(kobj);
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&sl->master->mutex);
|
2006-03-23 16:11:58 +00:00
|
|
|
if (w1_reset_select_slave(sl)) {
|
|
|
|
count = 0;
|
|
|
|
goto out_up;
|
|
|
|
}
|
|
|
|
|
|
|
|
w1_write_block(sl->master, buf, count);
|
|
|
|
|
|
|
|
out_up:
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&sl->master->mutex);
|
2006-03-23 16:11:58 +00:00
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2010-05-13 01:28:57 +00:00
|
|
|
static ssize_t w1_default_read(struct file *filp, struct kobject *kobj,
|
2007-06-09 05:57:22 +00:00
|
|
|
struct bin_attribute *bin_attr,
|
|
|
|
char *buf, loff_t off, size_t count)
|
2006-03-23 16:11:58 +00:00
|
|
|
{
|
|
|
|
struct w1_slave *sl = kobj_to_w1_slave(kobj);
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&sl->master->mutex);
|
2006-03-23 16:11:58 +00:00
|
|
|
w1_read_block(sl->master, buf, count);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&sl->master->mutex);
|
2006-03-23 16:11:58 +00:00
|
|
|
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,
|
|
|
|
};
|
2005-08-11 13:27:50 +00:00
|
|
|
|
2007-08-14 13:15:12 +00:00
|
|
|
static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static struct bus_type w1_bus_type = {
|
|
|
|
.name = "w1",
|
|
|
|
.match = w1_master_match,
|
2005-11-16 08:00:00 +00:00
|
|
|
.uevent = w1_uevent,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2005-08-11 09:20:07 +00:00
|
|
|
struct device_driver w1_master_driver = {
|
|
|
|
.name = "w1_master_driver",
|
2005-04-16 22:20:36 +00:00
|
|
|
.bus = &w1_bus_type,
|
|
|
|
.probe = w1_master_probe,
|
|
|
|
};
|
|
|
|
|
2005-08-11 09:20:07 +00:00
|
|
|
struct device w1_master_device = {
|
2005-04-16 22:20:36 +00:00
|
|
|
.parent = NULL,
|
|
|
|
.bus = &w1_bus_type,
|
2009-01-06 18:44:34 +00:00
|
|
|
.init_name = "w1 bus master",
|
2005-08-11 09:20:07 +00:00
|
|
|
.driver = &w1_master_driver,
|
2005-04-16 22:20:36 +00:00
|
|
|
.release = &w1_master_release
|
|
|
|
};
|
|
|
|
|
2006-04-04 16:35:22 +00:00
|
|
|
static struct device_driver w1_slave_driver = {
|
2005-08-11 09:20:07 +00:00
|
|
|
.name = "w1_slave_driver",
|
|
|
|
.bus = &w1_bus_type,
|
|
|
|
};
|
|
|
|
|
2006-04-04 16:35:22 +00:00
|
|
|
#if 0
|
2005-08-11 09:20:07 +00:00
|
|
|
struct device w1_slave_device = {
|
|
|
|
.parent = NULL,
|
|
|
|
.bus = &w1_bus_type,
|
2009-01-06 18:44:34 +00:00
|
|
|
.init_name = "w1 bus slave",
|
2005-08-11 09:20:07 +00:00
|
|
|
.driver = &w1_slave_driver,
|
2005-08-11 13:27:50 +00:00
|
|
|
.release = &w1_slave_release
|
2005-08-11 09:20:07 +00:00
|
|
|
};
|
2006-04-04 16:35:22 +00:00
|
|
|
#endif /* 0 */
|
2005-08-11 09:20:07 +00:00
|
|
|
|
2005-05-17 10:44:04 +00:00
|
|
|
static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
ssize_t count;
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
count = sprintf(buf, "%s\n", md->name);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2005-06-03 21:31:02 +00:00
|
|
|
static ssize_t w1_master_attribute_store_search(struct device * dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
const char * buf, size_t count)
|
|
|
|
{
|
2008-10-16 05:04:42 +00:00
|
|
|
long tmp;
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-06-03 21:31:02 +00:00
|
|
|
|
2008-10-16 05:04:42 +00:00
|
|
|
if (strict_strtol(buf, 0, &tmp) == -EINVAL)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2008-10-16 05:04:42 +00:00
|
|
|
md->search_count = tmp;
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2008-10-16 05:04:41 +00:00
|
|
|
wake_up_process(md->thread);
|
2005-06-03 21:31:02 +00:00
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t w1_master_attribute_show_search(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-06-03 21:31:02 +00:00
|
|
|
ssize_t count;
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-06-03 21:31:02 +00:00
|
|
|
count = sprintf(buf, "%d\n", md->search_count);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-06-03 21:31:02 +00:00
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:42 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:44:04 +00:00
|
|
|
static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
ssize_t count;
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
count = sprintf(buf, "0x%p\n", md->bus_master);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:44:04 +00:00
|
|
|
static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
ssize_t count;
|
|
|
|
count = sprintf(buf, "%d\n", w1_timeout);
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:44:04 +00:00
|
|
|
static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
ssize_t count;
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
count = sprintf(buf, "%d\n", md->max_slave_count);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:44:04 +00:00
|
|
|
static ssize_t w1_master_attribute_show_attempts(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
ssize_t count;
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
count = sprintf(buf, "%lu\n", md->attempts);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:44:04 +00:00
|
|
|
static ssize_t w1_master_attribute_show_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
ssize_t count;
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
count = sprintf(buf, "%d\n", md->slave_count);
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:43 +00:00
|
|
|
static ssize_t w1_master_attribute_show_slaves(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-08-11 13:27:49 +00:00
|
|
|
struct w1_master *md = dev_to_w1_master(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
int c = PAGE_SIZE;
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2005-05-20 18:33:25 +00:00
|
|
|
c -= snprintf(buf + PAGE_SIZE - c, c, "%s\n", sl->name);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&md->mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
return PAGE_SIZE - c;
|
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:43 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2005-05-20 18:33:25 +00:00
|
|
|
#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)
|
|
|
|
|
2005-06-03 21:31:02 +00:00
|
|
|
#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)
|
|
|
|
|
2005-05-20 18:33:25 +00:00
|
|
|
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);
|
2010-10-27 22:34:49 +00:00
|
|
|
static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP);
|
|
|
|
static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP);
|
|
|
|
static W1_MASTER_ATTR_RW(add, S_IRUGO | S_IWUSR | S_IWGRP);
|
|
|
|
static W1_MASTER_ATTR_RW(remove, S_IRUGO | S_IWUSR | S_IWGRP);
|
2005-05-20 18:33:25 +00:00
|
|
|
|
|
|
|
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,
|
2005-06-03 21:31:02 +00:00
|
|
|
&w1_master_attribute_search.attr,
|
2008-10-16 05:04:42 +00:00
|
|
|
&w1_master_attribute_pullup.attr,
|
2008-10-16 05:04:43 +00:00
|
|
|
&w1_master_attribute_add.attr,
|
|
|
|
&w1_master_attribute_remove.attr,
|
2005-05-20 18:33:25 +00:00
|
|
|
NULL
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2005-05-20 18:33:25 +00:00
|
|
|
static struct attribute_group w1_master_defattr_group = {
|
|
|
|
.attrs = w1_master_default_attrs,
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2005-05-20 18:33:25 +00:00
|
|
|
int w1_create_master_attributes(struct w1_master *master)
|
|
|
|
{
|
|
|
|
return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
|
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:38 +00:00
|
|
|
void w1_destroy_master_attributes(struct w1_master *master)
|
2005-05-20 18:33:25 +00:00
|
|
|
{
|
|
|
|
sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
|
|
|
|
}
|
|
|
|
|
2007-08-14 13:15:12 +00:00
|
|
|
static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
|
2005-08-11 09:20:07 +00:00
|
|
|
{
|
|
|
|
struct w1_master *md = NULL;
|
|
|
|
struct w1_slave *sl = NULL;
|
|
|
|
char *event_owner, *name;
|
2012-05-19 03:31:54 +00:00
|
|
|
int err = 0;
|
2005-08-11 09:20:07 +00:00
|
|
|
|
|
|
|
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 {
|
2005-11-16 08:00:00 +00:00
|
|
|
dev_dbg(dev, "Unknown event.\n");
|
2005-08-11 09:20:07 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2006-05-15 04:43:50 +00:00
|
|
|
dev_dbg(dev, "Hotplug event for %s %s, bus_id=%s.\n",
|
2009-01-06 18:44:34 +00:00
|
|
|
event_owner, name, dev_name(dev));
|
2005-08-11 09:20:07 +00:00
|
|
|
|
|
|
|
if (dev->driver != &w1_slave_driver || !sl)
|
2012-05-19 03:31:54 +00:00
|
|
|
goto end;
|
2005-08-11 09:20:07 +00:00
|
|
|
|
2007-08-14 13:15:12 +00:00
|
|
|
err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
|
2005-08-11 09:20:07 +00:00
|
|
|
if (err)
|
2012-05-19 03:31:54 +00:00
|
|
|
goto end;
|
2005-08-11 09:20:07 +00:00
|
|
|
|
2007-08-14 13:15:12 +00:00
|
|
|
err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
|
|
|
|
(unsigned long long)sl->reg_num.id);
|
2012-05-19 03:31:54 +00:00
|
|
|
end:
|
|
|
|
return err;
|
|
|
|
}
|
2005-08-11 09:20:07 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
static int __w1_attach_slave_device(struct w1_slave *sl)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
sl->dev.parent = &sl->master->dev;
|
2005-08-11 09:20:07 +00:00
|
|
|
sl->dev.driver = &w1_slave_driver;
|
2005-04-16 22:20:36 +00:00
|
|
|
sl->dev.bus = &w1_bus_type;
|
|
|
|
sl->dev.release = &w1_slave_release;
|
|
|
|
|
2009-01-06 18:44:34 +00:00
|
|
|
dev_set_name(&sl->dev, "%02x-%012llx",
|
2005-06-03 21:30:43 +00:00
|
|
|
(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);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-05-15 04:43:50 +00:00
|
|
|
dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
|
2009-01-06 18:44:34 +00:00
|
|
|
dev_name(&sl->dev), sl);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
err = device_register(&sl->dev);
|
|
|
|
if (err < 0) {
|
|
|
|
dev_err(&sl->dev,
|
2005-06-03 21:30:43 +00:00
|
|
|
"Device registration [%s] failed. err=%d\n",
|
2009-01-06 18:44:34 +00:00
|
|
|
dev_name(&sl->dev), err);
|
2005-04-16 22:20:36 +00:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
/* 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",
|
2009-01-06 18:44:34 +00:00
|
|
|
dev_name(&sl->dev), err);
|
2005-08-11 13:27:50 +00:00
|
|
|
goto out_unreg;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
/* Create "id" entry */
|
2008-10-16 05:04:50 +00:00
|
|
|
err = device_create_file(&sl->dev, &w1_slave_attr_id);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (err < 0) {
|
|
|
|
dev_err(&sl->dev,
|
2005-06-03 21:30:43 +00:00
|
|
|
"sysfs file creation for [%s] failed. err=%d\n",
|
2009-01-06 18:44:34 +00:00
|
|
|
dev_name(&sl->dev), err);
|
2005-08-11 13:27:50 +00:00
|
|
|
goto out_rem1;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
/* 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",
|
2009-01-06 18:44:34 +00:00
|
|
|
dev_name(&sl->dev), err);
|
2005-08-11 13:27:50 +00:00
|
|
|
goto out_rem2;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
|
|
|
|
|
|
|
|
return 0;
|
2005-08-11 13:27:50 +00:00
|
|
|
|
|
|
|
out_rem2:
|
2008-10-16 05:04:50 +00:00
|
|
|
device_remove_file(&sl->dev, &w1_slave_attr_id);
|
2005-08-11 13:27:50 +00:00
|
|
|
out_rem1:
|
|
|
|
device_remove_file(&sl->dev, &w1_slave_attr_name);
|
|
|
|
out_unreg:
|
|
|
|
device_unregister(&sl->dev);
|
|
|
|
return err;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
|
some kmalloc/memset ->kzalloc (tree wide)
Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).
Here is a short excerpt of the semantic patch performing
this transformation:
@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@
x =
- kmalloc
+ kzalloc
(E1,E2)
... when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);
@@
expression E1,E2,E3;
@@
- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)
[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 08:49:03 +00:00
|
|
|
sl = kzalloc(sizeof(struct w1_slave), GFP_KERNEL);
|
2005-04-16 22:20:36 +00:00
|
|
|
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);
|
|
|
|
|
2006-03-23 16:11:58 +00:00
|
|
|
memset(&msg, 0, sizeof(msg));
|
2005-04-16 22:20:36 +00:00
|
|
|
memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
|
|
|
|
atomic_set(&sl->refcnt, 0);
|
2005-08-11 13:27:50 +00:00
|
|
|
init_completion(&sl->released);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2013-05-26 18:06:50 +00:00
|
|
|
request_module("w1-family-0x%0x", rn->family);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
spin_lock(&w1_flock);
|
|
|
|
f = w1_family_registered(rn->family);
|
|
|
|
if (!f) {
|
2005-06-03 21:31:26 +00:00
|
|
|
f= &w1_default_family;
|
2005-04-16 22:20:36 +00:00
|
|
|
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++;
|
|
|
|
|
2006-03-23 16:11:58 +00:00
|
|
|
memcpy(msg.id.id, rn, sizeof(msg.id));
|
2005-04-16 22:20:36 +00:00
|
|
|
msg.type = W1_SLAVE_ADD;
|
|
|
|
w1_netlink_send(dev, &msg);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:38 +00:00
|
|
|
void w1_slave_detach(struct w1_slave *sl)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct w1_netlink_msg msg;
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
list_del(&sl->w1_slave_entry);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
if (sl->family->fops && sl->family->fops->remove_slave)
|
|
|
|
sl->family->fops->remove_slave(sl);
|
|
|
|
|
2006-03-23 16:11:58 +00:00
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
|
|
memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
|
2005-08-11 13:27:50 +00:00
|
|
|
msg.type = W1_SLAVE_REMOVE;
|
|
|
|
w1_netlink_send(sl->master, &msg);
|
|
|
|
|
2008-10-16 05:04:50 +00:00
|
|
|
device_remove_file(&sl->dev, &w1_slave_attr_id);
|
2005-08-11 13:27:50 +00:00
|
|
|
device_remove_file(&sl->dev, &w1_slave_attr_name);
|
2005-04-16 22:20:36 +00:00
|
|
|
device_unregister(&sl->dev);
|
|
|
|
|
2005-08-11 13:27:50 +00:00
|
|
|
wait_for_completion(&sl->released);
|
|
|
|
kfree(sl);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2006-03-23 16:11:58 +00:00
|
|
|
struct w1_master *w1_search_master_id(u32 id)
|
|
|
|
{
|
|
|
|
struct w1_master *dev;
|
|
|
|
int found = 0;
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&w1_mlock);
|
2006-03-23 16:11:58 +00:00
|
|
|
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
|
|
|
|
if (dev->id == id) {
|
|
|
|
found = 1;
|
|
|
|
atomic_inc(&dev->refcnt);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&w1_mlock);
|
2006-03-23 16:11:58 +00:00
|
|
|
|
|
|
|
return (found)?dev:NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct w1_slave *w1_search_slave(struct w1_reg_num *id)
|
|
|
|
{
|
|
|
|
struct w1_master *dev;
|
|
|
|
struct w1_slave *sl = NULL;
|
|
|
|
int found = 0;
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&w1_mlock);
|
2006-03-23 16:11:58 +00:00
|
|
|
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&dev->mutex);
|
2006-03-23 16:11:58 +00:00
|
|
|
list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
|
|
|
|
if (sl->reg_num.family == id->family &&
|
|
|
|
sl->reg_num.id == id->id &&
|
|
|
|
sl->reg_num.crc == id->crc) {
|
|
|
|
found = 1;
|
|
|
|
atomic_inc(&dev->refcnt);
|
|
|
|
atomic_inc(&sl->refcnt);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&dev->mutex);
|
2006-03-23 16:11:58 +00:00
|
|
|
|
|
|
|
if (found)
|
|
|
|
break;
|
|
|
|
}
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&w1_mlock);
|
2006-03-23 16:11:58 +00:00
|
|
|
|
|
|
|
return (found)?sl:NULL;
|
|
|
|
}
|
|
|
|
|
2008-10-16 05:04:38 +00:00
|
|
|
void w1_reconnect_slaves(struct w1_family *f, int attach)
|
2005-06-03 21:29:25 +00:00
|
|
|
{
|
2008-10-16 05:04:38 +00:00
|
|
|
struct w1_slave *sl, *sln;
|
2005-06-03 21:29:25 +00:00
|
|
|
struct w1_master *dev;
|
|
|
|
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_lock(&w1_mlock);
|
2005-06-03 21:29:25 +00:00
|
|
|
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
|
2008-10-16 05:04:38 +00:00
|
|
|
dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
|
|
|
|
"for family %02x.\n", dev->name, f->fid);
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
|
|
|
|
/* If it is a new family, slaves with the default
|
|
|
|
* family driver and are that family will be
|
|
|
|
* connected. If the family is going away, devices
|
|
|
|
* matching that family are reconneced.
|
|
|
|
*/
|
|
|
|
if ((attach && sl->family->fid == W1_FAMILY_DEFAULT
|
|
|
|
&& sl->reg_num.family == f->fid) ||
|
|
|
|
(!attach && sl->family->fid == f->fid)) {
|
|
|
|
struct w1_reg_num rn;
|
|
|
|
|
|
|
|
memcpy(&rn, &sl->reg_num, sizeof(rn));
|
|
|
|
w1_slave_detach(sl);
|
|
|
|
|
|
|
|
w1_attach_slave_device(dev, &rn);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "Reconnecting slaves in device %s "
|
|
|
|
"has been finished.\n", dev->name);
|
|
|
|
mutex_unlock(&dev->mutex);
|
2005-06-03 21:29:25 +00:00
|
|
|
}
|
2006-04-03 08:04:27 +00:00
|
|
|
mutex_unlock(&w1_mlock);
|
2005-06-03 21:29:25 +00:00
|
|
|
}
|
|
|
|
|
2011-05-26 23:26:03 +00:00
|
|
|
void w1_slave_found(struct w1_master *dev, u64 rn)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct w1_slave *sl;
|
|
|
|
struct w1_reg_num *tmp;
|
2005-06-30 18:52:38 +00:00
|
|
|
u64 rn_le = cpu_to_le64(rn);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-10-16 05:04:38 +00:00
|
|
|
atomic_inc(&dev->refcnt);
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
tmp = (struct w1_reg_num *) &rn;
|
|
|
|
|
2008-10-16 05:04:44 +00:00
|
|
|
sl = w1_slave_search_device(dev, tmp);
|
|
|
|
if (sl) {
|
|
|
|
set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
|
|
|
|
} else {
|
|
|
|
if (rn && tmp->crc == w1_calc_crc8((u8 *)&rn_le, 7))
|
|
|
|
w1_attach_slave_device(dev, tmp);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
atomic_dec(&dev->refcnt);
|
|
|
|
}
|
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
/**
|
|
|
|
* Performs a ROM Search & registers any devices found.
|
|
|
|
* The 1-wire search is a simple binary tree search.
|
|
|
|
* For each bit of the address, we read two bits and write one bit.
|
|
|
|
* The bit written will put to sleep all devies that don't match that bit.
|
|
|
|
* When the two reads differ, the direction choice is obvious.
|
|
|
|
* When both bits are 0, we must choose a path to take.
|
|
|
|
* When we can scan all 64 bits without having to choose a path, we are done.
|
|
|
|
*
|
|
|
|
* See "Application note 187 1-wire search algorithm" at www.maxim-ic.com
|
|
|
|
*
|
|
|
|
* @dev The master device to search
|
|
|
|
* @cb Function to call when a device is found
|
|
|
|
*/
|
2006-03-23 16:11:58 +00:00
|
|
|
void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-06-03 21:30:43 +00:00
|
|
|
u64 last_rn, rn, tmp64;
|
|
|
|
int i, slave_count = 0;
|
|
|
|
int last_zero, last_device;
|
|
|
|
int search_bit, desc_bit;
|
|
|
|
u8 triplet_ret = 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
search_bit = 0;
|
|
|
|
rn = last_rn = 0;
|
|
|
|
last_device = 0;
|
|
|
|
last_zero = -1;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
desc_bit = 64;
|
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
while ( !last_device && (slave_count++ < dev->max_slave_count) ) {
|
|
|
|
last_rn = rn;
|
2005-04-16 22:20:36 +00:00
|
|
|
rn = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Reset bus and all 1-wire device state machines
|
|
|
|
* so they can respond to our requests.
|
|
|
|
*
|
|
|
|
* Return 0 - device(s) present, 1 - no devices present.
|
|
|
|
*/
|
2012-05-18 05:59:52 +00:00
|
|
|
mutex_lock(&dev->bus_mutex);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (w1_reset_bus(dev)) {
|
2012-05-18 05:59:52 +00:00
|
|
|
mutex_unlock(&dev->bus_mutex);
|
2005-08-12 18:46:22 +00:00
|
|
|
dev_dbg(&dev->dev, "No devices present on the wire.\n");
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2011-12-10 01:36:11 +00:00
|
|
|
/* Do fast search on single slave bus */
|
|
|
|
if (dev->max_slave_count == 1) {
|
2012-05-18 05:59:52 +00:00
|
|
|
int rv;
|
2011-12-10 01:36:11 +00:00
|
|
|
w1_write_8(dev, W1_READ_ROM);
|
2012-05-18 05:59:52 +00:00
|
|
|
rv = w1_read_block(dev, (u8 *)&rn, 8);
|
|
|
|
mutex_unlock(&dev->bus_mutex);
|
2011-12-10 01:36:11 +00:00
|
|
|
|
2012-05-18 05:59:52 +00:00
|
|
|
if (rv == 8 && rn)
|
2011-12-10 01:36:11 +00:00
|
|
|
cb(dev, rn);
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
/* Start the search */
|
2006-03-23 16:11:58 +00:00
|
|
|
w1_write_8(dev, search_type);
|
2005-04-16 22:20:36 +00:00
|
|
|
for (i = 0; i < 64; ++i) {
|
2005-06-03 21:30:43 +00:00
|
|
|
/* Determine the direction/search bit */
|
|
|
|
if (i == desc_bit)
|
|
|
|
search_bit = 1; /* took the 0 path last time, so take the 1 path */
|
|
|
|
else if (i > desc_bit)
|
|
|
|
search_bit = 0; /* take the 0 path on the next branch */
|
2005-04-16 22:20:36 +00:00
|
|
|
else
|
2005-06-03 21:30:43 +00:00
|
|
|
search_bit = ((last_rn >> i) & 0x1);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
/** Read two bits and write one bit */
|
|
|
|
triplet_ret = w1_triplet(dev, search_bit);
|
|
|
|
|
|
|
|
/* quit if no device responded */
|
|
|
|
if ( (triplet_ret & 0x03) == 0x03 )
|
|
|
|
break;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
/* If both directions were valid, and we took the 0 path... */
|
|
|
|
if (triplet_ret == 0)
|
|
|
|
last_zero = i;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
/* extract the direction taken & update the device number */
|
|
|
|
tmp64 = (triplet_ret >> 2);
|
|
|
|
rn |= (tmp64 << i);
|
2008-10-16 05:04:39 +00:00
|
|
|
|
2013-03-02 13:50:15 +00:00
|
|
|
/* ensure we're called from kthread and not by netlink callback */
|
|
|
|
if (!dev->priv && kthread_should_stop()) {
|
2012-05-18 05:59:52 +00:00
|
|
|
mutex_unlock(&dev->bus_mutex);
|
2008-10-16 05:04:58 +00:00
|
|
|
dev_dbg(&dev->dev, "Abort w1_search\n");
|
2008-10-16 05:04:39 +00:00
|
|
|
return;
|
|
|
|
}
|
2005-06-03 21:30:43 +00:00
|
|
|
}
|
2012-05-18 05:59:52 +00:00
|
|
|
mutex_unlock(&dev->bus_mutex);
|
2005-05-20 18:33:25 +00:00
|
|
|
|
2005-06-03 21:30:43 +00:00
|
|
|
if ( (triplet_ret & 0x03) != 0x03 ) {
|
|
|
|
if ( (desc_bit == last_zero) || (last_zero < 0))
|
|
|
|
last_device = 1;
|
|
|
|
desc_bit = last_zero;
|
2008-10-16 05:04:38 +00:00
|
|
|
cb(dev, rn);
|
2005-06-03 21:30:43 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-05-26 23:26:03 +00:00
|
|
|
void w1_search_process_cb(struct w1_master *dev, u8 search_type,
|
|
|
|
w1_slave_found_callback cb)
|
2006-03-23 16:11:58 +00:00
|
|
|
{
|
|
|
|
struct w1_slave *sl, *sln;
|
|
|
|
|
|
|
|
list_for_each_entry(sl, &dev->slist, w1_slave_entry)
|
|
|
|
clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
|
|
|
|
|
2011-05-26 23:26:03 +00:00
|
|
|
w1_search_devices(dev, search_type, cb);
|
2006-03-23 16:11:58 +00:00
|
|
|
|
|
|
|
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
|
2008-01-14 08:55:08 +00:00
|
|
|
if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl)
|
2006-03-23 16:11:58 +00:00
|
|
|
w1_slave_detach(sl);
|
2008-01-14 08:55:08 +00:00
|
|
|
else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
|
2006-03-23 16:11:58 +00:00
|
|
|
sl->ttl = dev->slave_ttl;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dev->search_count > 0)
|
|
|
|
dev->search_count--;
|
|
|
|
}
|
|
|
|
|
2011-05-26 23:26:03 +00:00
|
|
|
static void w1_search_process(struct w1_master *dev, u8 search_type)
|
|
|
|
{
|
|
|
|
w1_search_process_cb(dev, search_type, w1_slave_found);
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
int w1_process(void *data)
|
|
|
|
{
|
|
|
|
struct w1_master *dev = (struct w1_master *) data;
|
2008-10-16 05:04:41 +00:00
|
|
|
/* As long as w1_timeout is only set by a module parameter the sleep
|
|
|
|
* time can be calculated in jiffies once.
|
|
|
|
*/
|
|
|
|
const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-10-16 05:04:41 +00:00
|
|
|
while (!kthread_should_stop()) {
|
2008-10-16 05:04:40 +00:00
|
|
|
if (dev->search_count) {
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
w1_search_process(dev, W1_SEARCH);
|
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
}
|
|
|
|
|
2005-06-25 06:13:50 +00:00
|
|
|
try_to_freeze();
|
2008-10-16 05:04:41 +00:00
|
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
|
|
|
|
if (kthread_should_stop())
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* Only sleep when the search is active. */
|
|
|
|
if (dev->search_count)
|
|
|
|
schedule_timeout(jtime);
|
|
|
|
else
|
|
|
|
schedule();
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
atomic_dec(&dev->refcnt);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-12-22 08:38:02 +00:00
|
|
|
static int __init w1_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
|
|
|
|
|
2006-03-23 16:11:58 +00:00
|
|
|
w1_init_netlink();
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
retval = bus_register(&w1_bus_type);
|
|
|
|
if (retval) {
|
|
|
|
printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
|
|
|
|
goto err_out_exit_init;
|
|
|
|
}
|
|
|
|
|
2005-08-11 09:20:07 +00:00
|
|
|
retval = driver_register(&w1_master_driver);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (retval) {
|
|
|
|
printk(KERN_ERR
|
|
|
|
"Failed to register master driver. err=%d.\n",
|
|
|
|
retval);
|
|
|
|
goto err_out_bus_unregister;
|
|
|
|
}
|
|
|
|
|
2005-08-11 09:20:07 +00:00
|
|
|
retval = driver_register(&w1_slave_driver);
|
|
|
|
if (retval) {
|
|
|
|
printk(KERN_ERR
|
2012-04-02 05:42:22 +00:00
|
|
|
"Failed to register slave driver. err=%d.\n",
|
2005-08-11 09:20:07 +00:00
|
|
|
retval);
|
|
|
|
goto err_out_master_unregister;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
2008-10-16 05:04:38 +00:00
|
|
|
#if 0
|
|
|
|
/* For undoing the slave register if there was a step after it. */
|
2005-08-11 09:20:07 +00:00
|
|
|
err_out_slave_unregister:
|
|
|
|
driver_unregister(&w1_slave_driver);
|
2008-10-16 05:04:38 +00:00
|
|
|
#endif
|
2005-08-11 09:20:07 +00:00
|
|
|
|
|
|
|
err_out_master_unregister:
|
|
|
|
driver_unregister(&w1_master_driver);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
err_out_bus_unregister:
|
|
|
|
bus_unregister(&w1_bus_type);
|
|
|
|
|
|
|
|
err_out_exit_init:
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2009-12-22 08:38:02 +00:00
|
|
|
static void __exit w1_fini(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct w1_master *dev;
|
|
|
|
|
2008-10-16 05:04:38 +00:00
|
|
|
/* Set netlink removal messages and some cleanup */
|
2005-05-20 18:33:25 +00:00
|
|
|
list_for_each_entry(dev, &w1_masters, w1_master_entry)
|
2005-04-16 22:20:36 +00:00
|
|
|
__w1_remove_master_device(dev);
|
|
|
|
|
2006-03-23 16:11:58 +00:00
|
|
|
w1_fini_netlink();
|
|
|
|
|
2005-08-11 09:20:07 +00:00
|
|
|
driver_unregister(&w1_slave_driver);
|
|
|
|
driver_unregister(&w1_master_driver);
|
2005-04-16 22:20:36 +00:00
|
|
|
bus_unregister(&w1_bus_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(w1_init);
|
|
|
|
module_exit(w1_fini);
|