linux-kernel - Re: [PATCH 3/3] i2c: xlp9xx: Add support for SMBAlert

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Message-ID: <20180306083647.GA11729@wintermute>
Date:   Tue, 6 Mar 2018 09:36:47 +0100
From:   Jan Glauber <jglauber@...ium.com>
To:     George Cherian <george.cherian@...ium.com>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        wsa@...-dreams.de, Kamlakant Patel <kamlakant.patel@...ium.com>
Subject: Re: [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@...ium.com>
> Signed-off-by: George Cherian <george.cherian@...ium.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