[PATCH] w1: hotplug support.
From: Greg KH
Date: Thu Sep 08 2005 - 17:26:38 EST
[PATCH] w1: hotplug support.
Here is W1 hotplug in addition to netlink notifications.
Signed-off-by: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
commit 7f772ed8df27c6941952452330c618512389c4c7
tree 6ad8320e0ee8bd2f4709176381662460ec4b1e45
parent 8949d2aa05ddf5e9a31d738568a79915970cb38e
author Evgeniy Polyakov <johnpol@xxxxxxxxxxx> Thu, 11 Aug 2005 13:20:07 +0400
committer Greg Kroah-Hartman <gregkh@xxxxxxx> Thu, 08 Sep 2005 14:41:26 -0700
drivers/w1/w1.c | 90 +++++++++++++++++++++++++++++++++++++++++++++------
drivers/w1/w1_int.c | 6 ++-
2 files changed, 82 insertions(+), 14 deletions(-)
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -125,27 +125,41 @@ static struct bin_attribute w1_slave_bin
.read = &w1_default_read_bin,
};
+static int w1_hotplug(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,
+ .hotplug = w1_hotplug,
};
-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
};
+struct device_driver w1_slave_driver = {
+ .name = "w1_slave_driver",
+ .bus = &w1_bus_type,
+};
+
+struct device w1_slave_device = {
+ .parent = NULL,
+ .bus = &w1_bus_type,
+ .bus_id = "w1 bus slave",
+ .driver = &w1_slave_driver,
+};
+
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);
@@ -329,12 +343,55 @@ void w1_destroy_master_attributes(struct
sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
}
+#ifdef CONFIG_HOTPLUG
+static int w1_hotplug(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 hotplug 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_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_FID=%02X", sl->reg_num.family);
+ if (err)
+ return err;
+
+ err = add_hotplug_env_var(envp, num_envp, &cur_index, buffer, buffer_size, &cur_len, "W1_SLAVE_ID=%024llX", sl->reg_num.id);
+ if (err)
+ return err;
+
+ return 0;
+};
+#else
+static int w1_hotplug(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;
@@ -507,7 +564,6 @@ void w1_reconnect_slaves(struct w1_famil
spin_unlock_bh(&w1_mlock);
}
-
static void w1_slave_found(unsigned long data, u64 rn)
{
int slave_count;
@@ -783,7 +839,7 @@ static int w1_init(void)
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",
@@ -791,18 +847,29 @@ static int w1_init(void)
goto err_out_bus_unregister;
}
+ 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;
+ }
+
control_thread = kernel_thread(&w1_control, NULL, 0);
if (control_thread < 0) {
printk(KERN_ERR "Failed to create control thread. err=%d\n",
control_thread);
retval = control_thread;
- goto err_out_driver_unregister;
+ 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);
@@ -821,7 +888,8 @@ static void w1_fini(void)
control_needs_exit = 1;
wait_for_completion(&w1_control_complete);
- driver_unregister(&w1_driver);
+ driver_unregister(&w1_slave_driver);
+ driver_unregister(&w1_master_driver);
bus_unregister(&w1_bus_type);
}
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -29,9 +29,9 @@
static u32 w1_ids = 1;
-extern struct device_driver w1_driver;
+extern struct device_driver w1_master_driver;
extern struct bus_type w1_bus_type;
-extern struct device w1_device;
+extern struct device w1_master_device;
extern int w1_max_slave_count;
extern int w1_max_slave_ttl;
extern struct list_head w1_masters;
@@ -125,7 +125,7 @@ int w1_add_master_device(struct w1_bus_m
return(-EINVAL);
}
- dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device);
+ dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_master_driver, &w1_master_device);
if (!dev)
return -ENOMEM;
-
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