linux-kernel - Re: [PATCH v2 2/5] hwmon: ina2xx: make shunt resistance configurable at run-time

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Date:	Sun, 30 Nov 2014 12:01:21 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Bartosz Golaszewski <bgolaszewski@...libre.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Patrick Titiano <ptitiano@...libre.com>,
	LM Sensors <lm-sensors@...sensors.org>,
	Jean Delvare <jdelvare@...e.de>
Subject: Re: [PATCH v2 2/5] hwmon: ina2xx: make shunt resistance configurable
 at run-time

On 11/27/2014 01:59 AM, Bartosz Golaszewski wrote:
> The shunt resistance can only be set via platform_data or device tree. This
> isn't suitable for devices in which the shunt resistance can change/isn't
> known at boot-time.
>
> Add a sysfs attribute that allows to read and set the shunt resistance.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>   drivers/hwmon/ina2xx.c | 62 +++++++++++++++++++++++++++++++++++++++++++++-----
>   1 file changed, 56 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
> index 0a6b60f..341da67 100644
> --- a/drivers/hwmon/ina2xx.c
> +++ b/drivers/hwmon/ina2xx.c
> @@ -51,6 +51,8 @@
>   #define INA226_ALERT_LIMIT		0x07
>   #define INA226_DIE_ID			0xFF
>
> +/* shunt resistor sysfs attribute index */
> +#define INA2XX_RSHUNT			0x8
>
After reading the datasheet again ... those defines were meant
to reflect registers, not to create 'dummy' index values for software.
Please rearrange your code to not require such constructs; it is just
confusing for others (including me).

Guenter

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