Currently, only handling SMBus alerts as a SMBus master is supported.
This adds support for the generation of SMBus Alerts as a slave.
Signed-off-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 22 ++++++++++++++++++++++
include/linux/i2c.h | 5 +++++
2 files changed, 27 insertions(+)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e584d88..9d49cee 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -3252,6 +3252,28 @@ int i2c_slave_unregister(struct i2c_client *client)
return ret;
}
EXPORT_SYMBOL_GPL(i2c_slave_unregister);
+
+int i2c_slave_smbus_alert(struct i2c_client *client)
+{
+ int ret;
+
+ if (!client->adapter->algo->smbus_alert_slave) {
+ dev_err(&client->dev, "%s: not supported by adapter\n",
+ __func__);
+ return -EOPNOTSUPP;
+ }
+
+ i2c_lock_adapter(client->adapter);
+ ret = client->adapter->algo->smbus_alert_slave(client);
+ i2c_unlock_adapter(client->adapter);
+
+ if (ret != 0)
+ dev_err(&client->dev, "%s: adapter returned error %d\n",
+ __func__, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(i2c_slave_smbus_alert);
#endif
MODULE_AUTHOR("Simon G. Vogl <simon@xxxxxxxxxxxxxxxxx>");
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 200cf13b..43b98f5 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -271,6 +271,8 @@ static inline int i2c_slave_event(struct i2c_client *client,
{
return client->slave_cb(client, event, val);
}
+
+extern int i2c_slave_smbus_alert(struct i2c_client *client);
#endif
/**
@@ -381,6 +383,8 @@ i2c_register_board_info(int busnum, struct i2c_board_info const *info,
* from the I2C_FUNC_* flags.
* @reg_slave: Register given client to I2C slave mode of this adapter
* @unreg_slave: Unregister given client from I2C slave mode of this adapter
+ * @smbus_alert_slave: Create an smbus alert from the I2C slave mode of this
+ * adapter
*
* The following structs are for those who like to implement new bus drivers:
* i2c_algorithm is the interface to a class of hardware solutions which can
@@ -410,6 +414,7 @@ struct i2c_algorithm {
#if IS_ENABLED(CONFIG_I2C_SLAVE)
int (*reg_slave)(struct i2c_client *client);
int (*unreg_slave)(struct i2c_client *client);
+ int (*smbus_alert_slave)(struct i2c_client *client);
#endif
};
--
2.8.0.rc3.226.g39d4020
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