}
EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);
-int of_reconfig_notify(unsigned long action, void *p)
+#ifdef DEBUG
+const char *action_names[] = {
+ [OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE",
+ [OF_RECONFIG_DETACH_NODE] = "DETACH_NODE",
+ [OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY",
+ [OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY",
+ [OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY",
+};
+#endif
+
+int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)
{
int rc;
+#ifdef DEBUG
+ struct of_reconfig_data *pr = p;
+
+ switch (action) {
+ case OF_RECONFIG_ATTACH_NODE:
+ case OF_RECONFIG_DETACH_NODE:
+ pr_debug("of/notify %-15s %s\n", action_names[action],
+ pr->dn->full_name);
+ break;
+ case OF_RECONFIG_ADD_PROPERTY:
+ case OF_RECONFIG_REMOVE_PROPERTY:
+ case OF_RECONFIG_UPDATE_PROPERTY:
+ pr_debug("of/notify %-15s %s:%s\n", action_names[action],
+ pr->dn->full_name, pr->prop->name);
+ break;
+ }
+#endif
rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p);
return notifier_to_errno(rc);
}
+/*
+ * of_reconfig_get_state_change() - Returns new state of device
+ * @action - action of the of notifier
+ * @arg - argument of the of notifier
+ *
+ * Returns the new state of a device based on the notifier used.
+ * Returns 0 on device going from enabled to disabled, 1 on device
+ * going from disabled to enabled and -1 on no change.
+ */
+int of_reconfig_get_state_change(unsigned long action, struct of_reconfig_data *pr)
+{
+ struct property *prop, *old_prop = NULL;
+ int is_status, status_state, old_status_state, prev_state, new_state;
+
+ /* figure out if a device should be created or destroyed */
+ switch (action) {
+ case OF_RECONFIG_ATTACH_NODE:
+ case OF_RECONFIG_DETACH_NODE:
+ prop = of_find_property(pr->dn, "status", NULL);
+ break;
+ case OF_RECONFIG_ADD_PROPERTY:
+ case OF_RECONFIG_REMOVE_PROPERTY:
+ prop = pr->prop;
+ break;
+ case OF_RECONFIG_UPDATE_PROPERTY:
+ prop = pr->prop;
+ old_prop = pr->old_prop;
+ break;
+ default:
+ return OF_RECONFIG_NO_CHANGE;
+ }
+
+ is_status = 0;
+ status_state = -1;
+ old_status_state = -1;
+ prev_state = -1;
+ new_state = -1;
+
+ if (prop && !strcmp(prop->name, "status")) {
+ is_status = 1;
+ status_state = !strcmp(prop->value, "okay") ||
+ !strcmp(prop->value, "ok");
+ if (old_prop)
+ old_status_state = !strcmp(old_prop->value, "okay") ||
+ !strcmp(old_prop->value, "ok");
+ }
+
+ switch (action) {
+ case OF_RECONFIG_ATTACH_NODE:
+ prev_state = 0;
+ /* -1 & 0 status either missing or okay */
+ new_state = status_state != 0;
+ break;
+ case OF_RECONFIG_DETACH_NODE:
+ /* -1 & 0 status either missing or okay */
+ prev_state = status_state != 0;
+ new_state = 0;
+ break;
+ case OF_RECONFIG_ADD_PROPERTY:
+ if (is_status) {
+ /* no status property -> enabled (legacy) */
+ prev_state = 1;
+ new_state = status_state;
+ }
+ break;
+ case OF_RECONFIG_REMOVE_PROPERTY:
+ if (is_status) {
+ prev_state = status_state;
+ /* no status property -> enabled (legacy) */
+ new_state = 1;
+ }
+ break;
+ case OF_RECONFIG_UPDATE_PROPERTY:
+ if (is_status) {
+ prev_state = old_status_state != 0;
+ new_state = status_state != 0;
+ }
+ break;
+ }
+
+ if (prev_state == new_state)
+ return OF_RECONFIG_NO_CHANGE;
+
+ return new_state ? OF_RECONFIG_CHANGE_ADD : OF_RECONFIG_CHANGE_REMOVE;
+}
+EXPORT_SYMBOL_GPL(of_reconfig_get_state_change);
+
int of_property_notify(int action, struct device_node *np,
struct property *prop, struct property *oldprop)
{
- struct of_prop_reconfig pr;
+ struct of_reconfig_data pr;
/* only call notifiers if the node is attached */
if (!of_node_is_attached(np))
np->child = NULL;
np->sibling = np->parent->child;
- np->allnext = np->parent->allnext;
- np->parent->allnext = np;
np->parent->child = np;
of_node_clear_flag(np, OF_DETACHED);
}
*/
int of_attach_node(struct device_node *np)
{
+ struct of_reconfig_data rd;
unsigned long flags;
+ memset(&rd, 0, sizeof(rd));
+ rd.dn = np;
+
mutex_lock(&of_mutex);
raw_spin_lock_irqsave(&devtree_lock, flags);
__of_attach_node(np);
__of_attach_node_sysfs(np);
mutex_unlock(&of_mutex);
- of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, np);
+ of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
return 0;
}
if (WARN_ON(!parent))
return;
- if (of_allnodes == np)
- of_allnodes = np->allnext;
- else {
- struct device_node *prev;
- for (prev = of_allnodes;
- prev->allnext != np;
- prev = prev->allnext)
- ;
- prev->allnext = np->allnext;
- }
-
if (parent->child == np)
parent->child = np->sibling;
else {
*/
int of_detach_node(struct device_node *np)
{
+ struct of_reconfig_data rd;
unsigned long flags;
int rc = 0;
+ memset(&rd, 0, sizeof(rd));
+ rd.dn = np;
+
mutex_lock(&of_mutex);
raw_spin_lock_irqsave(&devtree_lock, flags);
__of_detach_node(np);
__of_detach_node_sysfs(np);
mutex_unlock(&of_mutex);
- of_reconfig_notify(OF_RECONFIG_DETACH_NODE, np);
+ of_reconfig_notify(OF_RECONFIG_DETACH_NODE, &rd);
return rc;
}
}
/**
- * __of_node_alloc() - Create an empty device node dynamically.
- * @full_name: Full name of the new device node
- * @allocflags: Allocation flags (typically pass GFP_KERNEL)
+ * __of_node_dup() - Duplicate or create an empty device node dynamically.
+ * @fmt: Format string (plus vargs) for new full name of the device node
*
- * Create an empty device tree node, suitable for further modification.
- * The node data are dynamically allocated and all the node flags
- * have the OF_DYNAMIC & OF_DETACHED bits set.
- * Returns the newly allocated node or NULL on out of memory error.
+ * Create an device tree node, either by duplicating an empty node or by allocating
+ * an empty one suitable for further modification. The node data are
+ * dynamically allocated and all the node flags have the OF_DYNAMIC &
+ * OF_DETACHED bits set. Returns the newly allocated node or NULL on out of
+ * memory error.
*/
-struct device_node *__of_node_alloc(const char *full_name, gfp_t allocflags)
+struct device_node *__of_node_dup(const struct device_node *np, const char *fmt, ...)
{
+ va_list vargs;
struct device_node *node;
- node = kzalloc(sizeof(*node), allocflags);
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return NULL;
+ va_start(vargs, fmt);
+ node->full_name = kvasprintf(GFP_KERNEL, fmt, vargs);
+ va_end(vargs);
+ if (!node->full_name) {
+ kfree(node);
+ return NULL;
+ }
- node->full_name = kstrdup(full_name, allocflags);
of_node_set_flag(node, OF_DYNAMIC);
of_node_set_flag(node, OF_DETACHED);
- if (!node->full_name)
- goto err_free;
-
of_node_init(node);
+ /* Iterate over and duplicate all properties */
+ if (np) {
+ struct property *pp, *new_pp;
+ for_each_property_of_node(np, pp) {
+ new_pp = __of_prop_dup(pp, GFP_KERNEL);
+ if (!new_pp)
+ goto err_prop;
+ if (__of_add_property(node, new_pp)) {
+ kfree(new_pp->name);
+ kfree(new_pp->value);
+ kfree(new_pp);
+ goto err_prop;
+ }
+ }
+ }
return node;
- err_free:
- kfree(node->full_name);
- kfree(node);
+ err_prop:
+ of_node_put(node); /* Frees the node and properties */
return NULL;
}
{
switch (ce->action) {
case OF_RECONFIG_ADD_PROPERTY:
- pr_debug("%p: %s %s/%s\n",
- ce, "ADD_PROPERTY ", ce->np->full_name,
- ce->prop->name);
- break;
case OF_RECONFIG_REMOVE_PROPERTY:
- pr_debug("%p: %s %s/%s\n",
- ce, "REMOVE_PROPERTY", ce->np->full_name,
- ce->prop->name);
- break;
case OF_RECONFIG_UPDATE_PROPERTY:
- pr_debug("%p: %s %s/%s\n",
- ce, "UPDATE_PROPERTY", ce->np->full_name,
- ce->prop->name);
+ pr_debug("of/cset<%p> %-15s %s/%s\n", ce, action_names[ce->action],
+ ce->np->full_name, ce->prop->name);
break;
case OF_RECONFIG_ATTACH_NODE:
- pr_debug("%p: %s %s\n",
- ce, "ATTACH_NODE ", ce->np->full_name);
- break;
case OF_RECONFIG_DETACH_NODE:
- pr_debug("%p: %s %s\n",
- ce, "DETACH_NODE ", ce->np->full_name);
+ pr_debug("of/cset<%p> %-15s %s\n", ce, action_names[ce->action],
+ ce->np->full_name);
break;
}
}
static void __of_changeset_entry_notify(struct of_changeset_entry *ce, bool revert)
{
+ struct of_reconfig_data rd;
struct of_changeset_entry ce_inverted;
int ret;
switch (ce->action) {
case OF_RECONFIG_ATTACH_NODE:
case OF_RECONFIG_DETACH_NODE:
- ret = of_reconfig_notify(ce->action, ce->np);
+ memset(&rd, 0, sizeof(rd));
+ rd.dn = ce->np;
+ ret = of_reconfig_notify(ce->action, &rd);
break;
case OF_RECONFIG_ADD_PROPERTY:
case OF_RECONFIG_REMOVE_PROPERTY:
projects / cascardo / linux.git / blobdiff