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SubjectRe: [PATCH 3/3] i2c: xlp9xx: Add support for SMBAlert
On Tue, Feb 27, 2018 at 01:26:20PM +0000, George Cherian wrote:
> 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>
> ---
> drivers/i2c/busses/i2c-xlp9xx.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
> index eb8913e..9462eab 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 +450,21 @@ 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->alert_data.alert_edge_triggered = 0;

Hi George,

I think this is not needed anymore, see:
9b9f2b8bc2ac i2c: i2c-smbus: Use threaded irq for smbalert

--Jan

> +
> + 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 +485,10 @@ 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 +515,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev)
> if (err)
> return err;
>
> + err = xlp9xx_i2c_smbus_setup(priv, pdev);
> + if (err)
> + dev_info(&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);
>
> --
> 2.1.4

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