linux-kernel - Re: [PATCH v9 05/24] wfx: add main.c/main.h

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Message-ID: <2898137.rlL8Y2EFai@pc-42>
Date:   Wed, 26 Jan 2022 09:20:05 +0100
From:   Jérôme Pouiller <jerome.pouiller@...abs.com>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux-mmc@...r.kernel.org,
        Pali Rohár <pali@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v9 05/24] wfx: add main.c/main.h

Hi Kalle,

On Tuesday 11 January 2022 18:14:05 CET Jerome Pouiller wrote:
> From: Jérôme Pouiller <jerome.pouiller@...abs.com>
> 
> Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
> ---
>  drivers/net/wireless/silabs/wfx/main.c | 485 +++++++++++++++++++++++++
>  drivers/net/wireless/silabs/wfx/main.h |  42 +++
>  2 files changed, 527 insertions(+)
>  create mode 100644 drivers/net/wireless/silabs/wfx/main.c
>  create mode 100644 drivers/net/wireless/silabs/wfx/main.h
> 
[...]
> +/* The device needs data about the antenna configuration. This information in
> + * provided by PDS (Platform Data Set, this is the wording used in WF200
> + * documentation) files. For hardware integrators, the full process to create
> + * PDS files is described here:
> + *   https:github.com/SiliconLabs/wfx-firmware/blob/master/PDS/README.md
> + *
> + * The PDS file is an array of Time-Length-Value structs.
> + */
> + int wfx_send_pds(struct wfx_dev *wdev, u8 *buf, size_t len)
> +{
> +	int ret, chunk_type, chunk_len, chunk_num = 0;
> +
> +	if (*buf == '{') {
> +		dev_err(wdev->dev, "PDS: malformed file (legacy format?)\n");
> +		return -EINVAL;
> +	}
> +	while (len > 0) {
> +		chunk_type = get_unaligned_le16(buf + 0);
> +		chunk_len = get_unaligned_le16(buf + 2);
> +		if (chunk_len > len) {
> +			dev_err(wdev->dev, "PDS:%d: corrupted file\n", chunk_num);
> +			return -EINVAL;
> +		}
> +		if (chunk_type != WFX_PDS_TLV_TYPE) {
> +			dev_info(wdev->dev, "PDS:%d: skip unknown data\n", chunk_num);
> +			goto next;
> +		}
> +		if (chunk_len > WFX_PDS_MAX_CHUNK_SIZE)
> +			dev_warn(wdev->dev, "PDS:%d: unexpectly large chunk\n", chunk_num);
> +		if (buf[4] != '{' || buf[chunk_len - 1] != '}')
> +			dev_warn(wdev->dev, "PDS:%d: unexpected content\n", chunk_num);
> +
> +		ret = wfx_hif_configuration(wdev, buf + 4, chunk_len - 4);
> +		if (ret > 0) {
> +			dev_err(wdev->dev, "PDS:%d: invalid data (unsupported options?)\n",
> +				chunk_num);
> +			return -EINVAL;
> +		}
> +		if (ret == -ETIMEDOUT) {
> +			dev_err(wdev->dev, "PDS:%d: chip didn't reply (corrupted file?)\n",
> +				chunk_num);
> +			return ret;
> +		}
> +		if (ret) {
> +			dev_err(wdev->dev, "PDS:%d: chip returned an unknown error\n", chunk_num);
> +			return -EIO;
> +		}
> +next:
> +		chunk_num++;
> +		len -= chunk_len;
> +		buf += chunk_len;
> +	}
> +	return 0;
> +}

Kalle, is this function what you expected? If it is right for you, I am
going to send it to the staging tree.


-- 
Jérôme Pouiller