Dynamically inserting i2c client device nodes requires the use
of a single device registration method. Rework and export it.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 99 +++++++++++++++++++++++++++-----------------------
include/linux/i2c.h | 10 +++++
2 files changed, 64 insertions(+), 45 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 2f90ac6..e6da9d3 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -54,6 +54,7 @@
#include <linux/acpi.h>
#include <linux/jump_label.h>
#include <asm/uaccess.h>
+#include <linux/err.h>
#include "i2c-core.h"
@@ -1370,63 +1371,71 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
/* OF support code */
#if IS_ENABLED(CONFIG_OF)
-static void of_i2c_register_devices(struct i2c_adapter *adap)
+struct i2c_client *
+of_i2c_register_device(struct i2c_adapter *adap,
+ struct device_node *node)
{
- void *result;
- struct device_node *node;
+ struct i2c_client *result;
+ struct i2c_board_info info = {};
+ struct dev_archdata dev_ad = {};
+ const __be32 *addr;
+ int len;
- /* Only register child devices if the adapter has a node pointer set */
- if (!adap->dev.of_node)
- return;
+ dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
- dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
+ if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
+ dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
+ node->full_name);
+ return ERR_PTR(-EINVAL);
+ }
- for_each_available_child_of_node(adap->dev.of_node, node) {
- struct i2c_board_info info = {};
- struct dev_archdata dev_ad = {};
- const __be32 *addr;
- int len;
+ addr = of_get_property(node, "reg", &len);
+ if (!addr || (len < sizeof(int))) {
+ dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
+ node->full_name);
+ return ERR_PTR(-EINVAL);
+ }
- dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
+ info.addr = be32_to_cpup(addr);
+ if (info.addr > (1 << 10) - 1) {
+ dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
+ info.addr, node->full_name);
+ return ERR_PTR(-EINVAL);
+ }
- if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
- dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
- node->full_name);
- continue;
- }
+ info.irq = irq_of_parse_and_map(node, 0);
+ info.of_node = of_node_get(node);
+ info.archdata = &dev_ad;
- addr = of_get_property(node, "reg", &len);
- if (!addr || (len < sizeof(int))) {
- dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
- node->full_name);
- continue;
- }
+ if (of_get_property(node, "wakeup-source", NULL))
+ info.flags |= I2C_CLIENT_WAKE;
- info.addr = be32_to_cpup(addr);
- if (info.addr > (1 << 10) - 1) {
- dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
- info.addr, node->full_name);
- continue;
- }
+ request_module("%s%s", I2C_MODULE_PREFIX, info.type);
- info.irq = irq_of_parse_and_map(node, 0);
- info.of_node = of_node_get(node);
- info.archdata = &dev_ad;
+ result = i2c_new_device(adap, &info);
+ if (result == NULL) {
+ dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
+ node->full_name);
+ of_node_put(node);
+ irq_dispose_mapping(info.irq);
+ return ERR_PTR(-EINVAL);
+ }
+ return result;
+}
+EXPORT_SYMBOL(of_i2c_register_device);
- if (of_get_property(node, "wakeup-source", NULL))
- info.flags |= I2C_CLIENT_WAKE;
+static void of_i2c_register_devices(struct i2c_adapter *adap)
+{
+ struct device_node *node;
- request_module("%s%s", I2C_MODULE_PREFIX, info.type);
+ /* Only register child devices if the adapter has a node pointer set */
+ if (!adap->dev.of_node)
+ return;
- result = i2c_new_device(adap, &info);
- if (result == NULL) {
- dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
- node->full_name);
- of_node_put(node);
- irq_dispose_mapping(info.irq);
- continue;
- }
- }
+ dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
+
+ for_each_available_child_of_node(adap->dev.of_node, node)
+ of_i2c_register_device(adap, node);
}
static int of_dev_node_match(struct device *dev, void *data)
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index b556e0a..22a8f44 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -558,6 +558,9 @@ static inline int i2c_adapter_id(struct i2c_adapter *adap)
#endif /* I2C */
#if IS_ENABLED(CONFIG_OF)
+struct i2c_client *
+of_i2c_register_device(struct i2c_adapter *adap, struct device_node *node);
+
/* must call put_device() when done with returned i2c_client device */
extern struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
@@ -566,6 +569,13 @@ extern struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
#else
+static inline struct i2c_client *
+of_i2c_register_device(struct i2c_adapter *adap,
+ struct device_node *node)
+{
+ return ERR_PTR(-ENODEV);
+}
+
static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
{
return NULL;
--
1.7.12
--
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