Commit 69d17246 authored by Phil Reid's avatar Phil Reid Committed by Wolfram Sang
Browse files

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: default avatarPhil Reid <preid@electromag.com.au>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 3c0a60be

Documentation/devicetree/bindings/i2c/i2c.txt

+2 −2
Original line number Diff line number Diff line
@@ -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.

drivers/i2c/i2c-core-smbus.c

+22 −0
Original line number Diff line number Diff line
@@ -625,3 +625,25 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter, 
	return i2c_new_device(adapter, &ara_board_info);

}

EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert);



#if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_OF)

int of_i2c_setup_smbus_alert(struct i2c_adapter *adapter)

{

	struct i2c_client *client;

	int irq;



	irq = of_property_match_string(adapter->dev.of_node, "interrupt-names",

				       "smbus_alert");

	if (irq == -EINVAL || irq == -ENODATA)

		return 0;

	else if (irq < 0)

		return irq;



	client = i2c_setup_smbus_alert(adapter, NULL);

	if (!client)

		return -ENODEV;



	return 0;

}

EXPORT_SYMBOL_GPL(of_i2c_setup_smbus_alert);

#endif

drivers/i2c/i2c-smbus.c

+9 −1
Original line number Diff line number Diff line
@@ -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>
@@ -139,7 +140,14 @@ static int smbalert_probe(struct i2c_client *ara, 
	if (!alert)

		return -ENOMEM;



	if (setup) {

		irq = setup->irq;

	} else {

		irq = of_irq_get_byname(adapter->dev.of_node, "smbus_alert");

		if (irq <= 0)

			return irq;

	}



	INIT_WORK(&alert->alert, smbalert_work);

	alert->ara = ara;

include/linux/i2c-smbus.h

+9 −0
Original line number Diff line number Diff line
@@ -49,4 +49,13 @@ 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) && IS_ENABLED(CONFIG_OF)

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 */

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