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_MUTEX(w1_mlock);
LIST_HEAD(w1_masters);
-static struct task_struct *w1_control_thread;
+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)
{
.fops = &w1_default_fops,
};
-static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size);
+static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
static struct bus_type w1_bus_type = {
.name = "w1",
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 = simple_strtol(buf, NULL, 0);
+ md->search_count = tmp;
mutex_unlock(&md->mutex);
+ wake_up_process(md->thread);
return count;
}
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);
return count;
}
-static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device_attribute *attr, char *buf)
+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;
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, \
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_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
};
return sysfs_create_group(&master->dev.kobj, &w1_master_defattr_group);
}
-static void w1_destroy_master_attributes(struct w1_master *master)
+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)
+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, cur_index=0, cur_len=0;
+ int err;
if (dev->driver == &w1_master_driver) {
md = container_of(dev, struct w1_master, dev);
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);
+ err = add_uevent_var(env, "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);
+ 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, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
{
return 0;
}
return 0;
}
-static void w1_slave_detach(struct w1_slave *sl)
+void w1_slave_detach(struct w1_slave *sl)
{
struct w1_netlink_msg msg;
kfree(sl);
}
-static struct w1_master *w1_search_master(void *data)
-{
- struct w1_master *dev;
- int found = 0;
-
- mutex_lock(&w1_mlock);
- list_for_each_entry(dev, &w1_masters, w1_master_entry) {
- if (dev->bus_master->data == data) {
- found = 1;
- atomic_inc(&dev->refcnt);
- break;
- }
- }
- mutex_unlock(&w1_mlock);
-
- return (found)?dev:NULL;
-}
-
struct w1_master *w1_search_master_id(u32 id)
{
struct w1_master *dev;
return (found)?sl:NULL;
}
-void w1_reconnect_slaves(struct w1_family *f)
+void w1_reconnect_slaves(struct w1_family *f, int attach)
{
+ struct w1_slave *sl, *sln;
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);
+ 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);
}
mutex_unlock(&w1_mlock);
}
-static void w1_slave_found(void *data, u64 rn)
+static void w1_slave_found(struct w1_master *dev, u64 rn)
{
int slave_count;
struct w1_slave *sl;
struct list_head *ent;
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 %p, "
- "it is impossible.\n", data);
- return;
- }
+ atomic_inc(&dev->refcnt);
tmp = (struct w1_reg_num *) &rn;
sl->reg_num.crc == tmp->crc) {
set_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
break;
- } else if (sl->reg_num.family == tmp->family) {
- family_found = 1;
- break;
}
slave_count++;
/* extract the direction taken & update the device number */
tmp64 = (triplet_ret >> 2);
rn |= (tmp64 << i);
+
+ if (kthread_should_stop()) {
+ printk(KERN_INFO "Abort w1_search (exiting)\n");
+ return;
+ }
}
if ( (triplet_ret & 0x03) != 0x03 ) {
if ( (desc_bit == last_zero) || (last_zero < 0))
last_device = 1;
desc_bit = last_zero;
- cb(dev->bus_master->data, rn);
+ cb(dev, rn);
}
}
}
-static int w1_control(void *data)
-{
- struct w1_slave *sl, *sln;
- struct w1_master *dev, *n;
- int have_to_wait = 0;
-
- set_freezable();
- while (!kthread_should_stop() || have_to_wait) {
- have_to_wait = 0;
-
- try_to_freeze();
- msleep_interruptible(w1_control_timeout * 1000);
-
- list_for_each_entry_safe(dev, n, &w1_masters, w1_master_entry) {
- if (!kthread_should_stop() && !dev->flags)
- continue;
- /*
- * Little race: we can create thread but not set the flag.
- * Get a chance for external process to set flag up.
- */
- if (!dev->initialized) {
- have_to_wait = 1;
- continue;
- }
-
- if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
- set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
-
- mutex_lock(&w1_mlock);
- list_del(&dev->w1_master_entry);
- mutex_unlock(&w1_mlock);
-
- 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;
- }
-
- 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);
- }
- }
- }
-
- return 0;
-}
-
void w1_search_process(struct w1_master *dev, u8 search_type)
{
struct w1_slave *sl, *sln;
w1_search_devices(dev, search_type, w1_slave_found);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
- if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
+ if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl)
w1_slave_detach(sl);
-
- dev->slave_count--;
- } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
+ else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
sl->ttl = dev->slave_ttl;
}
int w1_process(void *data)
{
struct w1_master *dev = (struct w1_master *) data;
+ /* 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);
+
+ while (!kthread_should_stop()) {
+ if (dev->search_count) {
+ mutex_lock(&dev->mutex);
+ w1_search_process(dev, W1_SEARCH);
+ mutex_unlock(&dev->mutex);
+ }
- while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
try_to_freeze();
- msleep_interruptible(w1_timeout * 1000);
+ __set_current_state(TASK_INTERRUPTIBLE);
- if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
+ if (kthread_should_stop())
break;
- if (!dev->initialized)
- continue;
-
- if (dev->search_count == 0)
- continue;
-
- mutex_lock(&dev->mutex);
- w1_search_process(dev, W1_SEARCH);
- mutex_unlock(&dev->mutex);
+ /* Only sleep when the search is active. */
+ if (dev->search_count)
+ schedule_timeout(jtime);
+ else
+ schedule();
}
atomic_dec(&dev->refcnt);
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",
- retval);
- goto err_out_slave_unregister;
- }
-
return 0;
+#if 0
+/* For undoing the slave register if there was a step after it. */
err_out_slave_unregister:
driver_unregister(&w1_slave_driver);
+#endif
err_out_master_unregister:
driver_unregister(&w1_master_driver);
{
struct w1_master *dev;
+ /* Set netlink removal messages and some cleanup */
list_for_each_entry(dev, &w1_masters, w1_master_entry)
__w1_remove_master_device(dev);
w1_fini_netlink();
- kthread_stop(w1_control_thread);
-
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