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Commit 40f4e372 authored by George Cherian's avatar George Cherian Committed by Wolfram Sang
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i2c: xlp9xx: Add support for SMBAlert 



Add support for SMBus alert mechanism to i2c-xlp9xx driver.
The second interrupt is parsed to use for SMBus alert.
The first interrupt is the i2c controller main interrupt.

Signed-off-by: default avatarKamlakant Patel <kamlakant.patel@cavium.com>
Signed-off-by: default avatarGeorge Cherian <george.cherian@cavium.com>
Reviewed-by: default avatarJan Glauber <jglauber@cavium.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 966e9671

drivers/i2c/busses/i2c-xlp9xx.c

+24 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/clk.h>

#include <linux/completion.h>

#include <linux/i2c.h>

#include <linux/i2c-smbus.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/io.h>
@@ -84,6 +85,8 @@ struct xlp9xx_i2c_dev { 
	struct device *dev;

	struct i2c_adapter adapter;

	struct completion msg_complete;

	struct i2c_smbus_alert_setup alert_data;

	struct i2c_client *ara;

	int irq;

	bool msg_read;

	bool len_recv;
@@ -447,6 +450,19 @@ static int xlp9xx_i2c_get_frequency(struct platform_device *pdev, 
	return 0;

}



static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,

				  struct platform_device *pdev)

{

	if (!priv->alert_data.irq)

		return -EINVAL;



	priv->ara = i2c_setup_smbus_alert(&priv->adapter, &priv->alert_data);

	if (!priv->ara)

		return -ENODEV;



	return 0;

}



static int xlp9xx_i2c_probe(struct platform_device *pdev)

{

	struct xlp9xx_i2c_dev *priv;
@@ -467,6 +483,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev) 
		dev_err(&pdev->dev, "invalid irq!\n");

		return priv->irq;

	}

	/* SMBAlert irq */

	priv->alert_data.irq = platform_get_irq(pdev, 1);

	if (priv->alert_data.irq <= 0)

		priv->alert_data.irq = 0;



	xlp9xx_i2c_get_frequency(pdev, priv);

	xlp9xx_i2c_init(priv);
@@ -493,6 +513,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev) 
	if (err)

		return err;



	err = xlp9xx_i2c_smbus_setup(priv, pdev);

	if (err)

		dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);



	platform_set_drvdata(pdev, priv);

	dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);