[PATCH 1/3] drm/dp: Keep a list of drm_dp_aux helper.
Rafael Antognolli
rafael.antognolli at intel.com
Mon Sep 14 16:12:30 PDT 2015
This list will be used to get the aux channels registered through the
helpers. Two functions are provided to register/unregister notifier
listeners on the list, and another functiont to iterate over the list of
aux channels.
Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
---
drivers/gpu/drm/drm_dp_helper.c | 71 +++++++++++++++++++++++++++++++++++++++++
include/drm/drm_dp_helper.h | 6 ++++
2 files changed, 77 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 291734e..01a1489 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -710,6 +710,54 @@ static const struct i2c_algorithm drm_dp_i2c_algo = {
.master_xfer = drm_dp_i2c_xfer,
};
+struct drm_dp_aux_node {
+ struct klist_node list;
+ struct drm_dp_aux *aux;
+};
+
+static DEFINE_KLIST(drm_dp_aux_list, NULL, NULL);
+
+static BLOCKING_NOTIFIER_HEAD(aux_notifier);
+
+int drm_dp_aux_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&aux_notifier, nb);
+}
+EXPORT_SYMBOL(drm_dp_aux_register_notifier);
+
+int drm_dp_aux_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&aux_notifier, nb);
+}
+EXPORT_SYMBOL(drm_dp_aux_unregister_notifier);
+
+static struct drm_dp_aux *next_aux(struct klist_iter *i)
+{
+ struct klist_node *n = klist_next(i);
+ struct drm_dp_aux *aux = NULL;
+ struct drm_dp_aux_node *aux_node;
+
+ if (n) {
+ aux_node = container_of(n, struct drm_dp_aux_node, list);
+ aux = aux_node->aux;
+ }
+ return aux;
+}
+
+int drm_dp_aux_for_each(void *data, int (*fn)(struct drm_dp_aux *, void *))
+{
+ struct klist_iter i;
+ struct drm_dp_aux *aux;
+ int error = 0;
+
+ klist_iter_init(&drm_dp_aux_list, &i);
+ while ((aux = next_aux(&i)) && !error)
+ error = fn(aux, data);
+ klist_iter_exit(&i);
+ return error;
+}
+EXPORT_SYMBOL(drm_dp_aux_for_each);
+
/**
* drm_dp_aux_register() - initialise and register aux channel
* @aux: DisplayPort AUX channel
@@ -718,6 +766,7 @@ static const struct i2c_algorithm drm_dp_i2c_algo = {
*/
int drm_dp_aux_register(struct drm_dp_aux *aux)
{
+ struct drm_dp_aux_node *aux_node;
mutex_init(&aux->hw_mutex);
aux->ddc.algo = &drm_dp_i2c_algo;
@@ -732,6 +781,14 @@ int drm_dp_aux_register(struct drm_dp_aux *aux)
strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
sizeof(aux->ddc.name));
+ /* add aux to list and notify listeners */
+ aux_node = kzalloc(sizeof(*aux_node), GFP_KERNEL);
+ if (!aux_node)
+ return -ENOMEM;
+ aux_node->aux = aux;
+ klist_add_tail(&aux_node->list, &drm_dp_aux_list);
+ blocking_notifier_call_chain(&aux_notifier, DRM_DP_ADD_AUX, aux);
+
return i2c_add_adapter(&aux->ddc);
}
EXPORT_SYMBOL(drm_dp_aux_register);
@@ -742,6 +799,20 @@ EXPORT_SYMBOL(drm_dp_aux_register);
*/
void drm_dp_aux_unregister(struct drm_dp_aux *aux)
{
+ struct klist_iter i;
+ struct klist_node *n;
+
+ klist_iter_init(&drm_dp_aux_list, &i);
+ while ((n = klist_next(&i))) {
+ struct drm_dp_aux_node *aux_node =
+ container_of(n, struct drm_dp_aux_node, list);
+ if (aux_node->aux == aux) {
+ klist_del(n);
+ kfree(aux_node);
+ break;
+ }
+ }
+ blocking_notifier_call_chain(&aux_notifier, DRM_DP_DEL_AUX, aux);
i2c_del_adapter(&aux->ddc);
}
EXPORT_SYMBOL(drm_dp_aux_unregister);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 8c52d0ef1..023620c 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -763,7 +763,13 @@ int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link);
int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link);
+#define DRM_DP_ADD_AUX 0x01
+#define DRM_DP_DEL_AUX 0x02
+
int drm_dp_aux_register(struct drm_dp_aux *aux);
void drm_dp_aux_unregister(struct drm_dp_aux *aux);
+int drm_dp_aux_register_notifier(struct notifier_block *nb);
+int drm_dp_aux_unregister_notifier(struct notifier_block *nb);
+int drm_dp_aux_for_each(void *data, int (*fn)(struct drm_dp_aux *, void *));
#endif /* _DRM_DP_HELPER_H_ */
--
2.4.0
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