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Diffstat (limited to 'drivers/w1/w1.c')
-rw-r--r--drivers/w1/w1.c164
1 files changed, 96 insertions, 68 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 0459df843c58..22013ca2119c 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -96,14 +96,15 @@ static void w1_slave_release(struct device *dev)
complete(&sl->released);
}
-static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_slave *sl = dev_to_w1_slave(dev);
return sprintf(buf, "%s\n", sl->name);
}
+static DEVICE_ATTR_RO(name);
-static ssize_t w1_slave_read_id(struct device *dev,
+static ssize_t id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct w1_slave *sl = dev_to_w1_slave(dev);
@@ -112,17 +113,20 @@ static ssize_t w1_slave_read_id(struct device *dev,
memcpy(buf, (u8 *)&sl->reg_num, count);
return count;
}
+static DEVICE_ATTR_RO(id);
-static struct device_attribute w1_slave_attr_name =
- __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
-static struct device_attribute w1_slave_attr_id =
- __ATTR(id, S_IRUGO, w1_slave_read_id, NULL);
+static struct attribute *w1_slave_attrs[] = {
+ &dev_attr_name.attr,
+ &dev_attr_id.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(w1_slave);
/* Default family */
-static ssize_t w1_default_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
+static ssize_t rw_write(struct file *filp, 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);
@@ -139,9 +143,9 @@ out_up:
return count;
}
-static ssize_t w1_default_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
+static ssize_t rw_read(struct file *filp, 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);
@@ -151,29 +155,24 @@ static ssize_t w1_default_read(struct file *filp, struct kobject *kobj,
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 BIN_ATTR_RW(rw, PAGE_SIZE);
+
+static struct bin_attribute *w1_slave_bin_attrs[] = {
+ &bin_attr_rw,
+ NULL,
};
-static int w1_default_add_slave(struct w1_slave *sl)
-{
- return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
-}
+static const struct attribute_group w1_slave_default_group = {
+ .bin_attrs = w1_slave_bin_attrs,
+};
-static void w1_default_remove_slave(struct w1_slave *sl)
-{
- sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
-}
+static const struct attribute_group *w1_slave_default_groups[] = {
+ &w1_slave_default_group,
+ NULL,
+};
static struct w1_family_ops w1_default_fops = {
- .add_slave = w1_default_add_slave,
- .remove_slave = w1_default_remove_slave,
+ .groups = w1_slave_default_groups,
};
static struct w1_family w1_default_family = {
@@ -587,6 +586,66 @@ end:
return err;
}
+/*
+ * Handle sysfs file creation and removal here, before userspace is told that
+ * the device is added / removed from the system
+ */
+static int w1_bus_notify(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct device *dev = data;
+ struct w1_slave *sl;
+ struct w1_family_ops *fops;
+ int err;
+
+ /*
+ * Only care about slave devices at the moment. Yes, we should use a
+ * separate "type" for this, but for now, look at the release function
+ * to know which type it is...
+ */
+ if (dev->release != w1_slave_release)
+ return 0;
+
+ sl = dev_to_w1_slave(dev);
+ fops = sl->family->fops;
+
+ switch (action) {
+ case BUS_NOTIFY_ADD_DEVICE:
+ /* if the family driver needs to initialize something... */
+ if (fops->add_slave) {
+ err = fops->add_slave(sl);
+ if (err < 0) {
+ dev_err(&sl->dev,
+ "add_slave() call failed. err=%d\n",
+ err);
+ return err;
+ }
+ }
+ if (fops->groups) {
+ err = sysfs_create_groups(&sl->dev.kobj, fops->groups);
+ if (err) {
+ dev_err(&sl->dev,
+ "sysfs group creation failed. err=%d\n",
+ err);
+ return err;
+ }
+ }
+
+ break;
+ case BUS_NOTIFY_DEL_DEVICE:
+ if (fops->remove_slave)
+ sl->family->fops->remove_slave(sl);
+ if (fops->groups)
+ sysfs_remove_groups(&sl->dev.kobj, fops->groups);
+ break;
+ }
+ return 0;
+}
+
+static struct notifier_block w1_bus_nb = {
+ .notifier_call = w1_bus_notify,
+};
+
static int __w1_attach_slave_device(struct w1_slave *sl)
{
int err;
@@ -595,6 +654,7 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
sl->dev.driver = &w1_slave_driver;
sl->dev.bus = &w1_bus_type;
sl->dev.release = &w1_slave_release;
+ sl->dev.groups = w1_slave_groups;
dev_set_name(&sl->dev, "%02x-%012llx",
(unsigned int) sl->reg_num.family,
@@ -615,44 +675,13 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
return err;
}
- /* 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",
- dev_name(&sl->dev), err);
- goto out_unreg;
- }
-
- /* Create "id" entry */
- err = device_create_file(&sl->dev, &w1_slave_attr_id);
- if (err < 0) {
- dev_err(&sl->dev,
- "sysfs file creation for [%s] failed. err=%d\n",
- dev_name(&sl->dev), 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",
- dev_name(&sl->dev), err);
- goto out_rem2;
- }
+ dev_set_uevent_suppress(&sl->dev, false);
+ kobject_uevent(&sl->dev.kobj, KOBJ_ADD);
list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
return 0;
-
-out_rem2:
- device_remove_file(&sl->dev, &w1_slave_attr_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)
@@ -723,16 +752,11 @@ void w1_slave_detach(struct w1_slave *sl)
list_del(&sl->w1_slave_entry);
- if (sl->family->fops && sl->family->fops->remove_slave)
- sl->family->fops->remove_slave(sl);
-
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);
- device_remove_file(&sl->dev, &w1_slave_attr_id);
- device_remove_file(&sl->dev, &w1_slave_attr_name);
device_unregister(&sl->dev);
wait_for_completion(&sl->released);
@@ -1017,6 +1041,10 @@ static int __init w1_init(void)
goto err_out_exit_init;
}
+ retval = bus_register_notifier(&w1_bus_type, &w1_bus_nb);
+ if (retval)
+ goto err_out_bus_unregister;
+
retval = driver_register(&w1_master_driver);
if (retval) {
printk(KERN_ERR
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-19 22:04:51 +0300