Add the bus handler registration needed for performing overlays
containing i2c devices.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 86 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 5fb80b8..5120d28 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1073,10 +1073,89 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
return i2c_verify_adapter(dev);
}
EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
+
+#ifdef CONFIG_OF_OVERLAY
+static int i2c_handler_create(struct of_overlay_device_entry *de,
+ int revert)
+{
+ struct device_node *dn;
+ struct i2c_adapter *adap;
+ struct i2c_client *client;
+
+ if (!de || !de->np)
+ return -ENOTSUPP;
+
+ dn = de->np;
+
+ adap = of_find_i2c_adapter_by_node(dn->parent);
+ if (adap == NULL)
+ return -ENOTSUPP;
+
+ client = of_i2c_register_device(adap, dn);
+ put_device(&adap->dev);
+
+ if (client == NULL) {
+ pr_err("%s: failed to create i2c client device "
+ "for '%s'\n",
+ __func__, dn->full_name);
+ /* of_i2c_device_create tosses the real error code */
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int i2c_handler_remove(struct of_overlay_device_entry *de,
+ int revert)
+{
+ struct device_node *dn;
+ struct i2c_client *client;
+
+ if (!de || !de->np)
+ return -ENOTSUPP;
+
+ dn = de->np;
+
+ client = of_find_i2c_device_by_node(dn);
+ if (client == NULL)
+ return -ENOTSUPP;
+
+ /* unregister takes one ref away */
+ i2c_unregister_device(client);
+
+ /* and put the reference of the find */
+ put_device(&client->dev);
+
+ return 0;
+}
+
+static const struct of_overlay_handler_ops i2c_handler_ops = {
+ .create = i2c_handler_create,
+ .remove = i2c_handler_remove,
+};
+
+static struct of_overlay_handler i2c_handler = {
+ .name = "i2c",
+ .ops = &i2c_handler_ops,
+};
+
+static int __init i2c_bus_handler_register(void)
+{
+ return of_overlay_handler_register(&i2c_handler);
+}
+#endif
+
#else
static void of_i2c_register_devices(struct i2c_adapter *adap) { }
#endif /* CONFIG_OF */
+#if !defined(CONFIG_OF) || !defined(CONFIG_OF_OVERLAY)
+static inline int i2c_bus_handler_register(void)
+{
+ return 0;
+}
+#endif
+
/* ACPI support code */
#if IS_ENABLED(CONFIG_ACPI)
@@ -1668,8 +1747,14 @@ static int __init i2c_init(void)
retval = i2c_add_driver(&dummy_driver);
if (retval)
goto class_err;
- return 0;
+ retval = i2c_bus_handler_register();
+ if (retval)
+ goto bus_handler_err;
+
+ return 0;
+bus_handler_err:
+ i2c_del_driver(&dummy_driver);
class_err:
#ifdef CONFIG_I2C_COMPAT
class_compat_unregister(i2c_adapter_compat_class);
--
1.7.12
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