i2c: i2c-smbus: add of_i2c_setup_smbus_alert
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@electromag.com.au> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -59,8 +59,8 @@ wants to support one of the below features, it should adapt the bindings below.
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interrupts used by the device.
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- interrupt-names
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"irq" and "wakeup" names are recognized by I2C core, other names are
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left to individual drivers.
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"irq", "wakeup" and "smbus_alert" names are recognized by I2C core,
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other names are left to individual drivers.
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- host-notify
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device uses SMBus host notify protocol instead of interrupt line.
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@ -625,3 +625,25 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
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return i2c_new_device(adapter, &ara_board_info);
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}
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EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert);
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#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
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int of_i2c_setup_smbus_alert(struct i2c_adapter *adapter)
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{
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struct i2c_client *client;
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int irq;
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irq = of_property_match_string(adapter->dev.of_node, "interrupt-names",
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"smbus_alert");
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if (irq == -EINVAL || irq == -ENODATA)
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return 0;
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else if (irq < 0)
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return irq;
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client = i2c_setup_smbus_alert(adapter, NULL);
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if (!client)
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return -ENODEV;
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_i2c_setup_smbus_alert);
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#endif
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@ -21,6 +21,7 @@
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_irq.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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@ -139,7 +140,14 @@ static int smbalert_probe(struct i2c_client *ara,
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if (!alert)
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return -ENOMEM;
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irq = setup->irq;
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if (setup) {
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irq = setup->irq;
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} else {
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irq = of_irq_get_byname(adapter->dev.of_node, "smbus_alert");
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if (irq <= 0)
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return irq;
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}
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INIT_WORK(&alert->alert, smbalert_work);
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alert->ara = ara;
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@ -49,4 +49,13 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
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struct i2c_smbus_alert_setup *setup);
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int i2c_handle_smbus_alert(struct i2c_client *ara);
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#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)
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int of_i2c_setup_smbus_alert(struct i2c_adapter *adap);
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#else
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static inline int of_i2c_setup_smbus_alert(struct i2c_adapter *adap)
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{
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return 0;
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}
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#endif
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#endif /* _LINUX_I2C_SMBUS_H */
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