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Subject[PATCH 1/4] i2c: xlp9xx: Add support for SMBAlert
Date
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: Kamlakant Patel <kamlakant.patel@cavium.com>
Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: Jan Glauber <jglauber@cavium.com>
---
drivers/i2c/busses/i2c-xlp9xx.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index eb8913e..fe54512 100644
--- a/drivers/i2c/busses/i2c-xlp9xx.c
+++ b/drivers/i2c/busses/i2c-xlp9xx.c
@@ -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);

--
1.8.3.1
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