[PATCH] w1: Userspace communication protocol over connector.
There are three types of messages between w1 core and userspace:
1. Events. They are generated each time new master or slave device found
either due to automatic or requested search.
2. Userspace commands. Includes read/write and search/alarm search comamnds.
3. Replies to userspace commands.
From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index c9486c1..32d8de8 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -35,7 +35,6 @@
#include <asm/atomic.h>
#include "w1.h"
-#include "w1_io.h"
#include "w1_log.h"
#include "w1_int.h"
#include "w1_family.h"
@@ -55,7 +54,7 @@
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);
+DECLARE_MUTEX(w1_mlock);
LIST_HEAD(w1_masters);
static struct task_struct *w1_control_thread;
@@ -75,8 +74,6 @@
struct w1_master *md = dev_to_w1_master(dev);
dev_dbg(dev, "%s: Releasing %s.\n", __func__, md->name);
-
- dev_fini_netlink(md);
memset(md, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
kfree(md);
}
@@ -85,10 +82,10 @@
{
struct w1_slave *sl = dev_to_w1_slave(dev);
- dev_dbg(dev, "%s: Releasing %s.\n", __func__, sl->name);
+ printk("%s: Releasing %s.\n", __func__, sl->name);
while (atomic_read(&sl->refcnt)) {
- dev_dbg(dev, "Waiting for %s to become free: refcnt=%d.\n",
+ printk("Waiting for %s to become free: refcnt=%d.\n",
sl->name, atomic_read(&sl->refcnt));
if (msleep_interruptible(1000))
flush_signals(current);
@@ -111,7 +108,6 @@
{
struct w1_slave *sl = kobj_to_w1_slave(kobj);
- atomic_inc(&sl->refcnt);
if (off > 8) {
count = 0;
} else {
@@ -120,7 +116,6 @@
memcpy(buf, (u8 *)&sl->reg_num, count);
}
- atomic_dec(&sl->refcnt);
return count;
}
@@ -230,12 +225,11 @@
.release = &w1_master_release
};
-static struct device_driver w1_slave_driver = {
+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,
@@ -243,7 +237,6 @@
.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)
{
@@ -423,7 +416,7 @@
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);
}
@@ -454,14 +447,11 @@
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(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);
+ err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024LX", (u64)sl->reg_num.id);
if (err)
return err;
@@ -563,6 +553,7 @@
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);
@@ -593,7 +584,7 @@
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);
@@ -611,7 +602,8 @@
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);
@@ -628,7 +620,7 @@
struct w1_master *dev;
int found = 0;
- spin_lock_bh(&w1_mlock);
+ down(&w1_mlock);
list_for_each_entry(dev, &w1_masters, w1_master_entry) {
if (dev->bus_master->data == data) {
found = 1;
@@ -636,22 +628,69 @@
break;
}
}
- spin_unlock_bh(&w1_mlock);
+ up(&w1_mlock);
return (found)?dev:NULL;
}
+struct w1_master *w1_search_master_id(u32 id)
+{
+ struct w1_master *dev;
+ int found = 0;
+
+ down(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ if (dev->id == id) {
+ found = 1;
+ atomic_inc(&dev->refcnt);
+ break;
+ }
+ }
+ up(&w1_mlock);
+
+ 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;
+
+ down(&w1_mlock);
+ list_for_each_entry(dev, &w1_masters, w1_master_entry) {
+ down(&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;
+ }
+ }
+ up(&dev->mutex);
+
+ if (found)
+ break;
+ }
+ up(&w1_mlock);
+
+ return (found)?sl:NULL;
+}
+
void w1_reconnect_slaves(struct w1_family *f)
{
struct w1_master *dev;
- spin_lock_bh(&w1_mlock);
+ down(&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);
}
- spin_unlock_bh(&w1_mlock);
+ up(&w1_mlock);
}
static void w1_slave_found(void *data, u64 rn)
@@ -713,7 +752,7 @@
* @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;
@@ -744,7 +783,7 @@
}
/* 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)
@@ -806,9 +845,9 @@
if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
- spin_lock(&w1_mlock);
+ down(&w1_mlock);
list_del(&dev->w1_master_entry);
- spin_unlock(&w1_mlock);
+ up(&w1_mlock);
down(&dev->mutex);
list_for_each_entry_safe(sl, sln, &dev->slist, w1_slave_entry) {
@@ -843,10 +882,31 @@
return 0;
}
+void w1_search_process(struct w1_master *dev, u8 search_type)
+{
+ struct w1_slave *sl, *sln;
+
+ list_for_each_entry(sl, &dev->slist, w1_slave_entry)
+ clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
+
+ 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) {
+ w1_slave_detach(sl);
+
+ dev->slave_count--;
+ } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
+ sl->ttl = dev->slave_ttl;
+ }
+
+ if (dev->search_count > 0)
+ dev->search_count--;
+}
+
int w1_process(void *data)
{
struct w1_master *dev = (struct w1_master *) data;
- struct w1_slave *sl, *sln;
while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
try_to_freeze();
@@ -864,22 +924,7 @@
if (down_interruptible(&dev->mutex))
continue;
- list_for_each_entry(sl, &dev->slist, w1_slave_entry)
- clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
-
- w1_search_devices(dev, 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) {
- w1_slave_detach(sl);
-
- dev->slave_count--;
- } else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
- sl->ttl = dev->slave_ttl;
- }
-
- if (dev->search_count > 0)
- dev->search_count--;
+ w1_search_process(dev, W1_SEARCH);
up(&dev->mutex);
}
@@ -895,6 +940,8 @@
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);
@@ -947,6 +994,8 @@
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);