#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_io.h"
#include "w1_log.h"
#include "w1_int.h"
#include "w1_family.h"
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
static int w1_timeout = 10;
+static int w1_control_timeout = 1;
int w1_max_slave_count = 10;
int w1_max_slave_ttl = 10;
module_param_named(timeout, w1_timeout, int, 0);
+module_param_named(control_timeout, w1_control_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_SPINLOCK(w1_mlock);
+DEFINE_MUTEX(w1_mlock);
LIST_HEAD(w1_masters);
-static pid_t control_thread;
-static int control_needs_exit;
-static DECLARE_COMPLETION(w1_control_complete);
+static struct task_struct *w1_control_thread;
static int w1_master_match(struct device *dev, struct device_driver *drv)
{
return -ENODEV;
}
-static int w1_master_remove(struct device *dev)
+static void w1_master_release(struct device *dev)
{
- return 0;
+ 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_master_release(struct device *dev)
+static void w1_slave_release(struct device *dev)
{
- struct w1_master *md = container_of(dev, struct w1_master, dev);
+ struct w1_slave *sl = dev_to_w1_slave(dev);
+
+ printk("%s: Releasing %s.\n", __func__, sl->name);
+
+ while (atomic_read(&sl->refcnt)) {
+ printk("Waiting for %s to become free: refcnt=%d.\n",
+ sl->name, atomic_read(&sl->refcnt));
+ if (msleep_interruptible(1000))
+ flush_signals(current);
+ }
- complete(&md->dev_released);
+ w1_family_put(sl->family);
+ sl->master->slave_count--;
+
+ complete(&sl->released);
}
-static void w1_slave_release(struct device *dev)
+static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ struct w1_slave *sl = dev_to_w1_slave(dev);
- complete(&sl->dev_released);
+ return sprintf(buf, "%s\n", sl->name);
}
-static ssize_t w1_default_read_name(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t w1_slave_read_id(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
{
- return sprintf(buf, "No family registered.\n");
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
+
+ if (off > 8) {
+ count = 0;
+ } else {
+ if (off + count > 8)
+ count = 8 - off;
+
+ memcpy(buf, (u8 *)&sl->reg_num, count);
+ }
+
+ return count;
}
-static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off,
- size_t count)
+static struct device_attribute w1_slave_attr_name =
+ __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
+
+static struct bin_attribute w1_slave_attr_bin_id = {
+ .attr = {
+ .name = "id",
+ .mode = S_IRUGO,
+ },
+ .size = 8,
+ .read = w1_slave_read_id,
+};
+
+/* Default family */
+
+static ssize_t w1_default_write(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
{
- return sprintf(buf, "No family registered.\n");
+ 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 struct device_attribute w1_slave_attribute =
- __ATTR(name, S_IRUGO, w1_default_read_name, NULL);
+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_slave_bin_attribute = {
- .attr = {
- .name = "w1_slave",
- .mode = S_IRUGO,
- .owner = THIS_MODULE,
- },
- .size = W1_SLAVE_DATA_SIZE,
- .read = &w1_default_read_bin,
+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, char **envp, int num_envp, char *buffer, int buffer_size);
static struct bus_type w1_bus_type = {
.name = "w1",
.match = w1_master_match,
+ .uevent = w1_uevent,
};
-struct device_driver w1_driver = {
- .name = "w1_driver",
+struct device_driver w1_master_driver = {
+ .name = "w1_master_driver",
.bus = &w1_bus_type,
.probe = w1_master_probe,
- .remove = w1_master_remove,
};
-struct device w1_device = {
+struct device w1_master_device = {
.parent = NULL,
.bus = &w1_bus_type,
.bus_id = "w1 bus master",
- .driver = &w1_driver,
+ .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,
+ .bus_id = "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 = container_of(dev, struct w1_master, dev);
+ struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible (&md->mutex))
- return -EBUSY;
-
+ 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)
+{
+ struct w1_master *md = dev_to_w1_master(dev);
- up(&md->mutex);
+ mutex_lock(&md->mutex);
+ md->search_count = simple_strtol(buf, NULL, 0);
+ mutex_unlock(&md->mutex);
return count;
}
-static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t w1_master_attribute_show_search(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
{
- struct w1_master *md = container_of(dev, struct w1_master, dev);
+ struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
+ mutex_lock(&md->mutex);
+ count = sprintf(buf, "%d\n", md->search_count);
+ mutex_unlock(&md->mutex);
- count = sprintf(buf, "0x%p\n", md->bus_master);
+ 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;
- up(&md->mutex);
+ 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_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct w1_master *md = container_of(dev, struct w1_master, dev);
+ struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%d\n", md->max_slave_count);
-
- up(&md->mutex);
+ 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 = container_of(dev, struct w1_master, dev);
+ struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%lu\n", md->attempts);
-
- up(&md->mutex);
+ 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 = container_of(dev, struct w1_master, dev);
+ struct w1_master *md = dev_to_w1_master(dev);
ssize_t count;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
-
+ mutex_lock(&md->mutex);
count = sprintf(buf, "%d\n", md->slave_count);
-
- up(&md->mutex);
+ 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 = container_of(dev, struct w1_master, dev);
+ struct w1_master *md = dev_to_w1_master(dev);
int c = PAGE_SIZE;
- if (down_interruptible(&md->mutex))
- return -EBUSY;
+ mutex_lock(&md->mutex);
if (md->slave_count == 0)
c -= snprintf(buf + PAGE_SIZE - c, c, "not found.\n");
}
}
- up(&md->mutex);
+ mutex_unlock(&md->mutex);
return PAGE_SIZE - c;
}
__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(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 struct attribute *w1_master_default_attrs[] = {
&w1_master_attribute_name.attr,
&w1_master_attribute_attempts.attr,
&w1_master_attribute_timeout.attr,
&w1_master_attribute_pointer.attr,
+ &w1_master_attribute_search.attr,
NULL
};
return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
}
-void w1_destroy_master_attributes(struct w1_master *master)
+static 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, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct w1_master *md = NULL;
+ struct w1_slave *sl = NULL;
+ char *event_owner, *name;
+ int err, cur_index=0, cur_len=0;
+
+ 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->bus_id);
+
+ if (dev->driver != &w1_slave_driver || !sl)
+ return 0;
+
+ err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
+ &cur_len, "W1_FID=%02X", sl->reg_num.family);
+ if (err)
+ return err;
+
+ err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
+ &cur_len, "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, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ return 0;
+}
+#endif
+
static int __w1_attach_slave_device(struct w1_slave *sl)
{
int err;
sl->dev.parent = &sl->master->dev;
- sl->dev.driver = sl->master->driver;
+ sl->dev.driver = &w1_slave_driver;
sl->dev.bus = &w1_bus_type;
sl->dev.release = &w1_slave_release;
(unsigned int) sl->reg_num.family,
(unsigned long long) sl->reg_num.id);
- dev_dbg(&sl->dev, "%s: registering %s.\n", __func__,
- &sl->dev.bus_id[0]);
+ dev_dbg(&sl->dev, "%s: registering %s as %p.\n", __func__,
+ &sl->dev.bus_id[0], sl);
err = device_register(&sl->dev);
if (err < 0) {
return err;
}
- memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin));
- memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name));
-
- sl->attr_bin.read = sl->family->fops->rbin;
- sl->attr_name.show = sl->family->fops->rname;
-
- err = device_create_file(&sl->dev, &sl->attr_name);
+ /* 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",
sl->dev.bus_id, err);
- device_unregister(&sl->dev);
- return err;
+ goto out_unreg;
}
- err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin);
+ /* Create "id" entry */
+ err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
if (err < 0) {
dev_err(&sl->dev,
"sysfs file creation for [%s] failed. err=%d\n",
sl->dev.bus_id, err);
- device_remove_file(&sl->dev, &sl->attr_name);
- device_unregister(&sl->dev);
- return 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",
+ sl->dev.bus_id, err);
+ goto out_rem2;
}
list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
return 0;
+
+out_rem2:
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_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)
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->dev_released);
+ init_completion(&sl->released);
spin_lock(&w1_flock);
f = w1_family_registered(rn->family);
if (!f) {
- spin_unlock(&w1_flock);
+ 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);
- kfree(sl);
- return -ENODEV;
}
__w1_family_get(f);
spin_unlock(&w1_flock);
sl->ttl = dev->slave_ttl;
dev->slave_count++;
- memcpy(&msg.id.id, rn, sizeof(msg.id.id));
+ memcpy(msg.id.id, rn, sizeof(msg.id));
msg.type = W1_SLAVE_ADD;
w1_netlink_send(dev, &msg);
{
struct w1_netlink_msg msg;
- dev_info(&sl->dev, "%s: detaching %s.\n", __func__, sl->name);
+ dev_dbg(&sl->dev, "%s: detaching %s [%p].\n", __func__, sl->name, sl);
- while (atomic_read(&sl->refcnt)) {
- printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n",
- sl->name, atomic_read(&sl->refcnt));
+ list_del(&sl->w1_slave_entry);
- if (msleep_interruptible(1000))
- flush_signals(current);
- }
-
- sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin);
- device_remove_file(&sl->dev, &sl->attr_name);
- device_unregister(&sl->dev);
- w1_family_put(sl->family);
+ if (sl->family->fops && sl->family->fops->remove_slave)
+ sl->family->fops->remove_slave(sl);
- memcpy(&msg.id.id, &sl->reg_num, sizeof(msg.id.id));
+ memset(&msg, 0, sizeof(msg));
+ memcpy(msg.id.id, &sl->reg_num, sizeof(msg.id));
msg.type = W1_SLAVE_REMOVE;
w1_netlink_send(sl->master, &msg);
+
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
+ device_remove_file(&sl->dev, &w1_slave_attr_name);
+ device_unregister(&sl->dev);
+
+ wait_for_completion(&sl->released);
+ kfree(sl);
}
-static struct w1_master *w1_search_master(unsigned long data)
+static struct w1_master *w1_search_master(void *data)
{
struct w1_master *dev;
int found = 0;
- spin_lock_bh(&w1_mlock);
+ mutex_lock(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->bus_master->data == data) {
found = 1;
break;
}
}
- spin_unlock_bh(&w1_mlock);
+ mutex_unlock(&w1_mlock);
+
+ return (found)?dev:NULL;
+}
+
+struct w1_master *w1_search_master_id(u32 id)
+{
+ struct w1_master *dev;
+ int found = 0;
+
+ mutex_lock(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ if (dev->id == id) {
+ found = 1;
+ atomic_inc(&dev->refcnt);
+ break;
+ }
+ }
+ mutex_unlock(&w1_mlock);
return (found)?dev:NULL;
}
-static void w1_slave_found(unsigned long data, u64 rn)
+struct w1_slave *w1_search_slave(struct w1_reg_num *id)
+{
+ struct w1_master *dev;
+ struct w1_slave *sl = NULL;
+ int found = 0;
+
+ mutex_lock(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ mutex_lock(&dev->mutex);
+ 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;
+ }
+ }
+ mutex_unlock(&dev->mutex);
+
+ if (found)
+ break;
+ }
+ mutex_unlock(&w1_mlock);
+
+ return (found)?sl:NULL;
+}
+
+void w1_reconnect_slaves(struct w1_family *f)
+{
+ struct w1_master *dev;
+
+ mutex_lock(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ dev_dbg(&dev->dev, "Reconnecting slaves in %s into new family %02x.\n",
+ dev->name, f->fid);
+ set_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
+ }
+ mutex_unlock(&w1_mlock);
+}
+
+static void w1_slave_found(void *data, u64 rn)
{
int slave_count;
struct w1_slave *sl;
struct w1_reg_num *tmp;
int family_found = 0;
struct w1_master *dev;
+ u64 rn_le = cpu_to_le64(rn);
dev = w1_search_master(data);
if (!dev) {
- printk(KERN_ERR "Failed to find w1 master device for data %08lx, it is impossible.\n",
- data);
+ printk(KERN_ERR "Failed to find w1 master device for data %p, "
+ "it is impossible.\n", data);
return;
}
slave_count++;
}
- rn = cpu_to_le64(rn);
-
if (slave_count == dev->slave_count &&
- rn && ((le64_to_cpu(rn) >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn, 7)) {
+ rn && ((rn >> 56) & 0xff) == w1_calc_crc8((u8 *)&rn_le, 7)) {
w1_attach_slave_device(dev, tmp);
}
* @dev The master device to search
* @cb Function to call when a device is found
*/
-void w1_search(struct w1_master *dev, w1_slave_found_callback cb)
+void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb)
{
u64 last_rn, rn, tmp64;
int i, slave_count = 0;
* Return 0 - device(s) present, 1 - no devices present.
*/
if (w1_reset_bus(dev)) {
- dev_info(&dev->dev, "No devices present on the wire.\n");
+ dev_dbg(&dev->dev, "No devices present on the wire.\n");
break;
}
/* Start the search */
- w1_write_8(dev, W1_SEARCH);
+ w1_write_8(dev, search_type);
for (i = 0; i < 64; ++i) {
/* Determine the direction/search bit */
if (i == desc_bit)
{
struct w1_slave *sl, *sln;
struct w1_master *dev, *n;
- int err, have_to_wait = 0;
+ int have_to_wait = 0;
- daemonize("w1_control");
- allow_signal(SIGTERM);
-
- while (!control_needs_exit || have_to_wait) {
+ set_freezable();
+ while (!kthread_should_stop() || have_to_wait) {
have_to_wait = 0;
- try_to_freeze(PF_FREEZE);
- msleep_interruptible(w1_timeout * 1000);
-
- if (signal_pending(current))
- flush_signals(current);
+ try_to_freeze();
+ msleep_interruptible(w1_control_timeout * 1000);
list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
- if (!control_needs_exit && !dev->need_exit)
+ if (!kthread_should_stop() && !dev->flags)
continue;
/*
* Little race: we can create thread but not set the flag.
continue;
}
- spin_lock_bh(&w1_mlock);
- list_del(&dev->w1_master_entry);
- spin_unlock_bh(&w1_mlock);
+ if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
- if (control_needs_exit) {
- dev->need_exit = 1;
+ mutex_lock(&w1_mlock);
+ list_del(&dev->w1_master_entry);
+ mutex_unlock(&w1_mlock);
- err = kill_proc(dev->kpid, SIGTERM, 1);
- if (err)
- dev_err(&dev->dev,
- "Failed to send signal to w1 kernel thread %d.\n",
- dev->kpid);
+ mutex_lock(&dev->mutex);
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ w1_slave_detach(sl);
+ }
+ w1_destroy_master_attributes(dev);
+ mutex_unlock(&dev->mutex);
+ atomic_dec(&dev->refcnt);
+ continue;
}
- wait_for_completion(&dev->dev_exited);
-
- list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
- list_del(&sl->w1_slave_entry);
-
- w1_slave_detach(sl);
- kfree(sl);
+ if (test_bit(W1_MASTER_NEED_RECONNECT, &dev->flags)) {
+ dev_dbg(&dev->dev, "Reconnecting slaves in device %s.\n", dev->name);
+ mutex_lock(&dev->mutex);
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ if (sl->family->fid == W1_FAMILY_DEFAULT) {
+ 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);
+ clear_bit(W1_MASTER_NEED_RECONNECT, &dev->flags);
+ mutex_unlock(&dev->mutex);
}
- w1_destroy_master_attributes(dev);
- atomic_dec(&dev->refcnt);
}
}
- complete_and_exit(&w1_control_complete, 0);
+ return 0;
}
-int w1_process(void *data)
+void w1_search_process(struct w1_master *dev, u8 search_type)
{
- struct w1_master *dev = (struct w1_master *) data;
struct w1_slave *sl, *sln;
- daemonize("%s", dev->name);
- allow_signal(SIGTERM);
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry)
+ clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
- while (!dev->need_exit) {
- try_to_freeze(PF_FREEZE);
- msleep_interruptible(w1_timeout * 1000);
+ w1_search_devices(dev, search_type, w1_slave_found);
- if (signal_pending(current))
- flush_signals(current);
+ list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
+ if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
+ w1_slave_detach(sl);
- if (dev->need_exit)
- break;
+ dev->slave_count--;
+ } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
+ sl->ttl = dev->slave_ttl;
+ }
- if (!dev->initialized)
- continue;
+ if (dev->search_count > 0)
+ dev->search_count--;
+}
- if (down_interruptible(&dev->mutex))
- continue;
+int w1_process(void *data)
+{
+ struct w1_master *dev = (struct w1_master *) data;
- list_for_each_entry(sl, &dev->slist, w1_slave_entry)
- clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
+ while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ try_to_freeze();
+ msleep_interruptible(w1_timeout * 1000);
- w1_search_devices(dev, w1_slave_found);
+ if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
+ break;
- list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
- if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
- list_del (&sl->w1_slave_entry);
+ if (!dev->initialized)
+ continue;
- w1_slave_detach (sl);
- kfree (sl);
+ if (dev->search_count == 0)
+ continue;
- dev->slave_count--;
- } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
- sl->ttl = dev->slave_ttl;
- }
- up(&dev->mutex);
+ mutex_lock(&dev->mutex);
+ w1_search_process(dev, W1_SEARCH);
+ mutex_unlock(&dev->mutex);
}
atomic_dec(&dev->refcnt);
- complete_and_exit(&dev->dev_exited, 0);
return 0;
}
printk(KERN_INFO "Driver for 1-wire Dallas network protocol.\n");
+ w1_init_netlink();
+
retval = bus_register(&w1_bus_type);
if (retval) {
printk(KERN_ERR "Failed to register bus. err=%d.\n", retval);
goto err_out_exit_init;
}
- retval = driver_register(&w1_driver);
+ retval = driver_register(&w1_master_driver);
if (retval) {
printk(KERN_ERR
"Failed to register master driver. err=%d.\n",
goto err_out_bus_unregister;
}
- control_thread = kernel_thread(&w1_control, NULL, 0);
- if (control_thread < 0) {
+ retval = driver_register(&w1_slave_driver);
+ if (retval) {
+ printk(KERN_ERR
+ "Failed to register master driver. err=%d.\n",
+ retval);
+ goto err_out_master_unregister;
+ }
+
+ w1_control_thread = kthread_run(w1_control, NULL, "w1_control");
+ if (IS_ERR(w1_control_thread)) {
+ retval = PTR_ERR(w1_control_thread);
printk(KERN_ERR "Failed to create control thread. err=%d\n",
- control_thread);
- retval = control_thread;
- goto err_out_driver_unregister;
+ retval);
+ goto err_out_slave_unregister;
}
return 0;
-err_out_driver_unregister:
- driver_unregister(&w1_driver);
+err_out_slave_unregister:
+ driver_unregister(&w1_slave_driver);
+
+err_out_master_unregister:
+ driver_unregister(&w1_master_driver);
err_out_bus_unregister:
bus_unregister(&w1_bus_type);
list_for_each_entry(dev, &w1_masters, w1_master_entry)
__w1_remove_master_device(dev);
- control_needs_exit = 1;
- wait_for_completion(&w1_control_complete);
+ w1_fini_netlink();
+
+ kthread_stop(w1_control_thread);
- driver_unregister(&w1_driver);
+ driver_unregister(&w1_slave_driver);
+ driver_unregister(&w1_master_driver);
bus_unregister(&w1_bus_type);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff