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

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Date:   Thu, 10 Feb 2022 16:20:56 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Jérôme Pouiller <jerome.pouiller@...abs.com>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        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

Jérôme Pouiller <jerome.pouiller@...abs.com> writes:

> 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.

Looks better, but I don't get why '{' and '}' are still needed. Ah, does
the firmware require to have them?

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