linux-kernel - Re: [PATCH v9 1/4] mfd: add support for Diolan DLN-2 devices

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Date:	Mon, 27 Oct 2014 09:57:49 -0700
From:	Joe Perches <joe@...ches.com>
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 v9 1/4] mfd: add support for Diolan DLN-2 devices

On Mon, 2014-10-27 at 18:31 +0200, Octavian Purdila wrote:
> This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO
> Master Adapter DLN-2. Details about the device can be found here:

trivia:

> diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
[]
> +static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
> +			  const void *obuf, unsigned obuf_len,
> +			  void *ibuf, unsigned *ibuf_len)
> +{
> +	int ret = 0;
> +	int rx_slot;
> +	struct dln2_response *rsp;
> +	struct dln2_rx_context *rxc;
> +	struct device *dev = &dln2->interface->dev;
> +	const int timeout = DLN2_USB_TIMEOUT * HZ / 1000;

unsigned long timeout?

[]

> +	ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout);
> +	if (ret <= 0) {
> +		if (!ret)
> +			ret = -ETIMEDOUT;
> +		goto out_free_rx_slot;
> +	}

[]

> +static int dln2_print_serialno(struct dln2_dev *dln2)
> +{
> +	int ret;
> +	__le32 serial_no;
> +	int len = sizeof(serial_no);
> +	struct device *dev = &dln2->interface->dev;
> +
> +	ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0,
> +			     &serial_no, &len);
> +	if (ret < 0)
> +		return ret;
> +	if (len < sizeof(serial_no))
> +		return -EREMOTEIO;
> +
> +	dev_info(dev, "Diolan DLN2 serial 0x%x\n", le32_to_cpu(serial_no));

why a hex serial #?


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