linux-kernel - Re: [PATCH 3/4] drivers/hwmon/pmbus: Add generic alarm bit for iin and pin

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Date:   Wed, 9 Aug 2017 15:53:24 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.vnet.ibm.com>
Cc:     jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, joel@....id.au, jk@...abs.org,
        andrew@...id.au, cbostic@...ux.vnet.ibm.com,
        "Edward A. James" <eajames@...ibm.com>
Subject: Re: [PATCH 3/4] drivers/hwmon/pmbus: Add generic alarm bit for iin
 and pin

On Wed, Aug 09, 2017 at 05:19:16PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@...ibm.com>
> 
> Add PB_STATUS_INPUT as the generic alarm bit for iin and pin. We also
> need to redo the status register checking before setting up the boolean
> attribute, since it won't necessarily check STATUS_WORD if the device
> doesn't support it, which we need for this bit.
> 
> Signed-off-by: Edward A. James <eajames@...ibm.com>

For the entire series: subject should start with "hwmon: (pmbus)".

> ---
>  drivers/hwmon/pmbus/pmbus_core.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index 277d170..1a51f8f 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -1045,6 +1045,7 @@ static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
>  				      const struct pmbus_sensor_attr *attr)
>  {
>  	struct pmbus_sensor *base;
> +	bool upper = !!(attr->gbit & 0xff00);	/* need to check STATUS_WORD */
>  	int ret;
>  
>  	if (attr->label) {
> @@ -1065,10 +1066,13 @@ static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
>  		/*
>  		 * Add generic alarm attribute only if there are no individual
>  		 * alarm attributes, if there is a global alarm bit, and if
> -		 * the generic status register for this page is accessible.
> +		 * the generic status register (word or byte, depending on
> +		 * which global bit is set) for this page is accessible.
>  		 */
>  		if (!ret && attr->gbit &&
> -		    pmbus_check_status_register(client, page)) {
> +		    ((upper && pmbus_check_word_register(client, page,
> +							 PMBUS_STATUS_WORD)) ||
> +		     (!upper && pmbus_check_status_register(client, page)))) {

We already know if PMBUS_STATUS_WORD is supported or not, since
pmbus_check_status_register() will use it. Just store that knowledge
in a flag when discovered and make this something like

		if (!ret && attr->gbit &&
		    (!upper || (upper && data->has_word_status)) &&
		    pmbus_check_status_register(client, page)) {

>  			ret = pmbus_add_boolean(data, name, "alarm", index,
>  						NULL, NULL,
>  						PB_STATUS_BASE + page,
> @@ -1324,6 +1328,7 @@ static int pmbus_add_sensor_attrs(struct i2c_client *client,
>  		.func = PMBUS_HAVE_IIN,
>  		.sfunc = PMBUS_HAVE_STATUS_INPUT,
>  		.sbase = PB_STATUS_INPUT_BASE,
> +		.gbit = PB_STATUS_INPUT,
>  		.limit = iin_limit_attrs,
>  		.nlimit = ARRAY_SIZE(iin_limit_attrs),
>  	}, {
> @@ -1408,6 +1413,7 @@ static int pmbus_add_sensor_attrs(struct i2c_client *client,
>  		.func = PMBUS_HAVE_PIN,
>  		.sfunc = PMBUS_HAVE_STATUS_INPUT,
>  		.sbase = PB_STATUS_INPUT_BASE,
> +		.gbit = PB_STATUS_INPUT,
>  		.limit = pin_limit_attrs,
>  		.nlimit = ARRAY_SIZE(pin_limit_attrs),
>  	}, {
> -- 
> 1.8.3.1
> 
> --
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