linux-kernel - Re: [PATCH v7 3/6] iio: imu: adis: Add DIAG

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Message-ID: <20250216164313.495aabdc@jic23-huawei>
Date: Sun, 16 Feb 2025 16:43:13 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Robert Budai <robert.budai@...log.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Nuno Sa <nuno.sa@...log.com>, Ramona
 Gradinariu <ramona.gradinariu@...log.com>, Antoniu Miclaus
 <antoniu.miclaus@...log.com>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Jonathan Corbet <corbet@....net>, <linux-iio@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v7 3/6] iio: imu: adis: Add DIAG_STAT register

On Tue, 11 Feb 2025 19:57:00 +0200
Robert Budai <robert.budai@...log.com> wrote:

> Some devices may have more than 16 bits of status. This patch allows the user
> to specify the size of the DIAG_STAT register. It defaults to 2 if not
> specified. This is mainly for backward compatibility.
> 
> Co-developed-by: Ramona Gradinariu <ramona.gradinariu@...log.com>
> Signed-off-by: Ramona Gradinariu <ramona.gradinariu@...log.com>
> Co-developed-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> Signed-off-by: Nuno Sá <nuno.sa@...log.com>
> Signed-off-by: Robert Budai <robert.budai@...log.com>
> ---
>  drivers/iio/imu/adis.c       | 19 ++++++++++++++++---
>  include/linux/iio/imu/adis.h |  3 +++
>  2 files changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
> index 84344f052..b3f074116 100644
> --- a/drivers/iio/imu/adis.c
> +++ b/drivers/iio/imu/adis.c
> @@ -304,11 +304,21 @@ EXPORT_SYMBOL_NS(__adis_enable_irq, "IIO_ADISLIB");
>   */
>  int __adis_check_status(struct adis *adis)
>  {
> -	u16 status;
> +	unsigned int status;
> +	int diag_stat_bits;
> +	u16 status_16;
>  	int ret;
>  	int i;
>  
> -	ret = __adis_read_reg_16(adis, adis->data->diag_stat_reg, &status);
> +	if (adis->data->diag_stat_size)
> +		ret = adis->ops->read(adis, adis->data->diag_stat_reg, &status,
> +				      adis->data->diag_stat_size);
> +	else
> +	{

This doesn't match kernel style. 
	if (adis->data->diag_stat_size) {
		ret = adis->ops->read(adis, adis->data->diag_stat_reg, &status,
				      adis->data->diag_stat_size);
	} else {
		ret = __adis_read_reg_16(adis, adis->data->diag_stat_reg,
					 &status_16);
		status = status_16;
	}

Also the integer instead of pointer issue 0-day found. 

Jonathan


> +		ret = __adis_read_reg_16(adis, adis->data->diag_stat_reg,
> +					 status_16);
> +		status = status_16;
> +	}
>  	if (ret)
>  		return ret;
>  
> @@ -317,7 +327,10 @@ int __adis_check_status(struct adis *adis)
>  	if (status == 0)
>  		return 0;
>  
> -	for (i = 0; i < 16; ++i) {
> +	diag_stat_bits = BITS_PER_BYTE * (adis->data->diag_stat_size ?
> +					  adis->data->diag_stat_size : 2);
> +
> +	for (i = 0; i < diag_stat_bits; ++i) {
>  		if (status & BIT(i)) {
>  			dev_err(&adis->spi->dev, "%s.\n",
>  				adis->data->status_error_msgs[i]);
> diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
> index 52652f51d..35797fe93 100644
> --- a/include/linux/iio/imu/adis.h
> +++ b/include/linux/iio/imu/adis.h
> @@ -44,6 +44,8 @@ struct adis_timeout {
>   * @glob_cmd_reg: Register address of the GLOB_CMD register
>   * @msc_ctrl_reg: Register address of the MSC_CTRL register
>   * @diag_stat_reg: Register address of the DIAG_STAT register
> + * @diag_stat_size: 	Length (in bytes) of the DIAG_STAT register. If 0 the 
> + * 			default length is 2 bytes long.
>   * @prod_id_reg: Register address of the PROD_ID register
>   * @prod_id: Product ID code that should be expected when reading @prod_id_reg
>   * @self_test_mask: Bitmask of supported self-test operations
> @@ -70,6 +72,7 @@ struct adis_data {
>  	unsigned int glob_cmd_reg;
>  	unsigned int msc_ctrl_reg;
>  	unsigned int diag_stat_reg;
> +	unsigned int diag_stat_size;
>  	unsigned int prod_id_reg;
>  
>  	unsigned int prod_id;