linux-kernel - Re: [PATCH v8 2/4] i2c: add support for Diolan DLN-2 USB-I2C adapter

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Date:	Thu, 23 Oct 2014 17:19:40 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	gregkh@...uxfoundation.org, linus.walleij@...aro.org,
	gnurou@...il.com, wsa@...-dreams.de, sameo@...ux.intel.com,
	lee.jones@...aro.org, arnd@...db.de, johan@...nel.org,
	daniel.baluta@...el.com, laurentiu.palcu@...el.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v8 2/4] i2c: add support for Diolan DLN-2 USB-I2C adapter

On Wed, Oct 15, 2014 at 05:48:09PM +0300, Octavian Purdila wrote:

> +static int dln2_i2c_xfer(struct i2c_adapter *adapter,
> +			 struct i2c_msg *msgs, int num)
> +{
> +	struct dln2_i2c *dln2 = i2c_get_adapdata(adapter);
> +	struct i2c_msg *pmsg;
> +	struct device *dev = &dln2->pdev->dev;

You want to use the i2c-adapter device here (not the platform device).

> +	int i;
> +
> +	for (i = 0; i < num; i++) {
> +		int ret;
> +
> +		pmsg = &msgs[i];
> +
> +		if (pmsg->len > DLN2_I2C_MAX_XFER_SIZE) {
> +			dev_warn(dev, "maximum transfer size exceeded\n");
> +			return -EOPNOTSUPP;
> +		}
> +
> +		if (pmsg->flags & I2C_M_RD) {
> +			ret = dln2_i2c_read(dln2, pmsg->addr, pmsg->buf,
> +					    pmsg->len);
> +			if (ret < 0)
> +				return ret;
> +
> +			pmsg->len = ret;
> +		} else {
> +			ret = dln2_i2c_write(dln2, pmsg->addr, pmsg->buf,
> +					     pmsg->len);
> +			if (ret != pmsg->len)
> +				return -EPROTO;
> +		}
> +	}
> +
> +	return num;
> +}

[...]

> +static int dln2_i2c_probe(struct platform_device *pdev)
> +{
> +	int ret;
> +	struct dln2_i2c *dln2;
> +	struct device *dev = &pdev->dev;
> +	struct dln2_platform_data *pdata = dev_get_platdata(&pdev->dev);
> +
> +	dln2 = devm_kzalloc(dev, sizeof(*dln2), GFP_KERNEL);
> +	if (!dln2)
> +		return -ENOMEM;
> +
> +	dln2->buf = devm_kmalloc(dev, DLN2_I2C_BUF_SIZE, GFP_KERNEL);
> +	if (!dln2->buf)
> +		return -ENOMEM;
> +
> +	dln2->pdev = pdev;
> +	dln2->port = pdata->port;
> +
> +	/* setup i2c adapter description */
> +	dln2->adapter.owner = THIS_MODULE;
> +	dln2->adapter.class = I2C_CLASS_HWMON;
> +	dln2->adapter.algo = &dln2_i2c_usb_algorithm;
> +	dln2->adapter.dev.parent = dev;
> +	i2c_set_adapdata(&dln2->adapter, dln2);
> +	snprintf(dln2->adapter.name, sizeof(dln2->adapter.name), "%s-%s-%d",
> +		 "dln2-i2c", dev_name(pdev->dev.parent), dln2->port);
> +
> +	platform_set_drvdata(pdev, dln2);
> +
> +	/* initialize the i2c interface */

No longer "initialisation" since you dropped the frequency setup?

> +	ret = dln2_i2c_enable(dln2, true);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to initialize adapter: %d\n", ret);

Same here.

> +		return ret;
> +	}
> +
> +	/* and finally attach to i2c layer */
> +	ret = i2c_add_adapter(&dln2->adapter);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to add I2C adapter: %d\n", ret);
> +		goto out_disable;
> +	}
> +
> +	return 0;
> +
> +out_disable:
> +	dln2_i2c_enable(dln2, false);
> +
> +	return ret;
> +}

Looks good otherwise.

Johan
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