netdev - Re: [PATCH net-next 05/19] net: usb: aqc111: Introduce PHY access

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Date:   Mon, 08 Oct 2018 15:52:54 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Igor Russkikh <Igor.Russkikh@...antia.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Dmitry Bezrukov <Dmitry.Bezrukov@...antia.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 05/19] net: usb: aqc111: Introduce PHY access

On Fr, 2018-10-05 at 10:24 +0000, Igor Russkikh wrote:
> From: Dmitry Bezrukov <dmitry.bezrukov@...antia.com>
> 
> Implement PHY power up/down sequences.
> AQC111, depending on FW used, may has PHY being controlled either
> directly (dpa = 1) or via vendor command interface (dpa = 0).
> Drivers supports both themes.
> We determine this from firmware versioning agreement.
> 
> Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@...antia.com>
> Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
> ---
>  drivers/net/usb/aqc111.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/net/usb/aqc111.h | 70 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 163 insertions(+)
> 
> diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c
> index 22bb259d71fb..30219bb6ddfd 100644
> --- a/drivers/net/usb/aqc111.c
> +++ b/drivers/net/usb/aqc111.c
> @@ -138,15 +138,44 @@ static int aqc111_write_cmd(struct usbnet *dev, u8 cmd, u16 value,
>  	return __aqc111_write_cmd(dev, cmd, value, index, size, data, 0);
>  }
>  
> +static int aq_mdio_read_cmd(struct usbnet *dev, u16 value, u16 index,
> +			    u16 size, void *data)
> +{
> +	return aqc111_read_cmd(dev, AQ_PHY_CMD, value, index, size, data);
> +}
> +
> +static int aq_mdio_write_cmd(struct usbnet *dev, u16 value, u16 index,
> +			     u16 size, void *data)
> +{
> +	return aqc111_write_cmd(dev, AQ_PHY_CMD, value, index, size, data);
> +}
> +
>  static const struct net_device_ops aqc111_netdev_ops = {
>  	.ndo_open		= usbnet_open,
>  	.ndo_stop		= usbnet_stop,
>  };
>  
> +static void aqc111_read_fw_version(struct usbnet *dev,
> +				   struct aqc111_data *aqc111_data)
> +{
> +	aqc111_read_cmd(dev, AQ_ACCESS_MAC, AQ_FW_VER_MAJOR,
> +			1, 1, &aqc111_data->fw_ver.major);
> +	aqc111_read_cmd(dev, AQ_ACCESS_MAC, AQ_FW_VER_MINOR,
> +			1, 1, &aqc111_data->fw_ver.minor);
> +	aqc111_read_cmd(dev, AQ_ACCESS_MAC, AQ_FW_VER_REV,
> +			1, 1, &aqc111_data->fw_ver.rev);

Why read the stuff you don't need?

> +
> +	if (aqc111_data->fw_ver.major & 0x80)
> +		aqc111_data->fw_ver.major &= ~0x80;
> +	else
> +		aqc111_data->dpa = 1;
> +}
> +
>  static int aqc111_bind(struct usbnet *dev, struct usb_interface *intf)
>  {
>  	int ret;
>  	struct usb_device *udev = interface_to_usbdev(intf);
> +	struct aqc111_data *aqc111_data;
>  
>  	/* Check if vendor configuration */
>  	if (udev->actconfig->desc.bConfigurationValue != 1) {
> @@ -162,8 +191,18 @@ static int aqc111_bind(struct usbnet *dev, struct usb_interface *intf)
>  		return ret;
>  	}
>  
> +	aqc111_data = kzalloc(sizeof(*aqc111_data), GFP_KERNEL);
> +	if (!aqc111_data)
> +		return -ENOMEM;
> +
> +	/* store aqc111_data pointer in device data field */
> +	dev->data[0] = (unsigned long)aqc111_data;
> +	memset(aqc111_data, 0, sizeof(*aqc111_data));

Either kzalloc() or a memset. Not both.
> +
>  	dev->net->netdev_ops = &aqc111_netdev_ops;
>  
> +	aqc111_read_fw_version(dev, aqc111_data);
> +
>  	return 0;
>  }

	Regards
		Oliver