From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Cherian Subject: [PATCH 3/3] i2c: xlp9xx: Add support for SMBAlert Date: Tue, 27 Feb 2018 13:26:20 +0000 Message-ID: <1519737980-27997-3-git-send-email-george.cherian@cavium.com> References: <1519737980-27997-1-git-send-email-george.cherian@cavium.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1519737980-27997-1-git-send-email-george.cherian@cavium.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Cc: wsa@the-dreams.de, George Cherian , Kamlakant Patel List-Id: linux-i2c@vger.kernel.org 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 Signed-off-by: George Cherian --- 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 #include #include +#include #include #include #include @@ -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; + + 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