This commit adds of_i2c_setup_smbus_alert which allows the smbalert
driver to be attached to an i2c adapter via the device tree.
Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/i2c/i2c.txt | 4 +--
drivers/i2c/i2c-smbus.c | 35 +++++++++++++++++++++++++++
include/linux/i2c-smbus.h | 9 +++++++
3 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index cee9d50..1126398 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -59,8 +59,8 @@ wants to support one of the below features, it should adapt the bindings below.
interrupts used by the device.
- interrupt-names
- "irq" and "wakeup" names are recognized by I2C core, other names are
- left to individual drivers.
+ "irq", "wakeup" and "smbus_alert" names are recognized by I2C core,
+ other names are left to individual drivers.
- host-notify
device uses SMBus host notify protocol instead of interrupt line.
diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index df0e2fa..a8f8439 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -21,6 +21,7 @@
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
@@ -238,6 +239,40 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
}
EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert);
+int of_i2c_setup_smbus_alert(struct i2c_adapter *adap)
+{
+ struct i2c_client *client;
+ struct i2c_smbus_alert_setup *setup;
+ struct i2c_board_info info = {
+ I2C_BOARD_INFO("smbus_alert", 0x0c),
+ };
+ int irq;
+
+ if (!adap->dev.of_node)
+ return 0;
+
+ irq = of_irq_get_byname(adap->dev.of_node, "smbus_alert");
+ if (irq == -EINVAL || irq == -ENODATA)
+ return 0;
+ else if (irq < 0)
+ return irq;
+
+ setup = devm_kzalloc(&adap->dev, sizeof(struct i2c_smbus_alert_setup),
+ GFP_KERNEL);
+ if (!setup)
+ return -ENOMEM;
+
+ setup->irq = irq;
+ info.platform_data = setup;
+
+ client = i2c_new_device(adap, &info);
+ if (!client)
+ return -ENODEV;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_i2c_setup_smbus_alert);
+
/**
* i2c_handle_smbus_alert - Handle an SMBus alert
* @ara: the ARA client on the relevant adapter
diff --git a/include/linux/i2c-smbus.h b/include/linux/i2c-smbus.h
index a138502..4732d09 100644
--- a/include/linux/i2c-smbus.h
+++ b/include/linux/i2c-smbus.h
@@ -50,4 +50,13 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
struct i2c_smbus_alert_setup *setup);
int i2c_handle_smbus_alert(struct i2c_client *ara);
+#if IS_ENABLED(CONFIG_I2C_SMBUS)
+int of_i2c_setup_smbus_alert(struct i2c_adapter *adap);
+#else
+static inline int of_i2c_setup_smbus_alert(struct i2c_adapter *adap)
+{
+ return 0;
+}
+#endif
+
#endif /* _LINUX_I2C_SMBUS_H */
--
1.8.3.1
--
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