linux-kernel - Re: [PATCH v2 4/6] iio: chemical: ens160: add triggered buffer support

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Date: Sun, 2 Jun 2024 12:27:33 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Gustavo Silva <gustavograzs@...il.com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 lars@...afoo.de, christophe.jaillet@...adoo.fr, devicetree@...r.kernel.org,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] iio: chemical: ens160: add triggered buffer
 support

On Tue, 28 May 2024 21:14:21 -0300
Gustavo Silva <gustavograzs@...il.com> wrote:

> ENS160 supports a data ready interrupt. Use it in combination with
> triggered buffer for continuous data readings.
> 
> Signed-off-by: Gustavo Silva <gustavograzs@...il.com>
A couple of really minor comments inline.

Thanks,

Jonathan


>  #endif
> diff --git a/drivers/iio/chemical/ens160_core.c b/drivers/iio/chemical/ens160_core.c
> index a535f62c4..74ef7f150 100644
> --- a/drivers/iio/chemical/ens160_core.c
> +++ b/drivers/iio/chemical/ens160_core.c
> @@ -10,6 +10,9 @@
>  
>  #include <linux/bitfield.h>
>  #include <linux/iio/iio.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
>  #include <linux/module.h>
>  #include <linux/regmap.h>
>  
> @@ -19,9 +22,14 @@
>  
>  #define ENS160_BOOTING_TIME_MS 10U
>  
> -#define ENS160_REG_PART_ID	0x00

move this in earlier patch so no need to realign here.

> +#define ENS160_REG_PART_ID		0x00
>  
> -#define ENS160_REG_OPMODE	0x10
> +#define ENS160_REG_OPMODE		0x10
> +
> +#define ENS160_REG_CONFIG		0x11
> +#define ENS160_REG_CONFIG_INTEN		BIT(0)
> +#define ENS160_REG_CONFIG_INTDAT	BIT(1)
> +#define ENS160_REG_CONFIG_INT_CFG	BIT(5)
>  
>  #define ENS160_REG_MODE_DEEP_SLEEP	0x00
>  #define ENS160_REG_MODE_IDLE		0x01
> @@ -48,7 +56,12 @@
>  
>  struct ens160_data {
>  	struct regmap *regmap;
> -	u8 fw_version[3] __aligned(IIO_DMA_MINALIGN);
> +	struct mutex mutex;

Mutex needs a comment to say what data it is protecting.

> +	struct {
> +		__le16 chans[2];
> +		s64 timestamp __aligned(8);
> +	} scan __aligned(IIO_DMA_MINALIGN);
> +	u8 fw_version[3];
>  	__le16 buf;
>  };