linux-kernel - Re: [PATCH] hwmon: (ibmpowernv) Add current(A) sensors

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Message-ID: <56a39618-dc4f-385c-77c3-5c9be92e2d48@kaod.org>
Date:   Mon, 19 Jun 2017 14:52:16 +0200
From:   Cédric Le Goater <clg@...d.org>
To:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        linux@...ck-us.net, stewart@...ux.vnet.ibm.com
Cc:     jdelvare@...e.com, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, svaidy@...ux.vnet.ibm.com,
        ego@...ux.vnet.ibm.com, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH] hwmon: (ibmpowernv) Add current(A) sensors

On 06/19/2017 11:25 AM, Shilpasri G Bhat wrote:
> This patch exports current(A) sensors in inband sensors copied to
> main memory by OCC.
> 
> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> ---
>  drivers/hwmon/ibmpowernv.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
> index 862b832..e0557f9 100644
> --- a/drivers/hwmon/ibmpowernv.c
> +++ b/drivers/hwmon/ibmpowernv.c
> @@ -50,6 +50,7 @@ enum sensors {
>  	TEMP,
>  	POWER_SUPPLY,
>  	POWER_INPUT,
> +	CURRENT,
>  	MAX_SENSOR_TYPE,
>  };
>  
> @@ -65,7 +66,8 @@ enum sensors {
>  	{"fan", "ibm,opal-sensor-cooling-fan"},
>  	{"temp", "ibm,opal-sensor-amb-temp"},
>  	{"in", "ibm,opal-sensor-power-supply"},
> -	{"power", "ibm,opal-sensor-power"}
> +	{"power", "ibm,opal-sensor-power"},
> +	{"curr", "ibm,opal-sensor-current"},
>  };
>  
>  struct sensor_data {
> 


I know why you are doing that but that is the old (cr?@#!y) way to 
define sensor types. we should try to improve thing a little more 
and use the "sensor-type" property only.

I think the patch below should help you adding new types without 
too much changes to your skiboot patchset. Could you please check ? 

Thanks,

C. 

From: Cédric Le Goater <clg@...d.org>
Subject: [PATCH] hwmon: (ibmpowernv) introduce a legacy_compatibles array
Date: Mon, 19 Jun 2017 14:29:29 +0200
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Today, the type of a PowerNV sensor system is determined with the
"compatible" property for legacy Firmwares and with the "sensor-type"
for newer ones. The same array of strings is used for both to do the
matching and this raises some issue to introduce new sensor types.

Let's introduce two different arrays (legacy and current) to make
things easier for new sensor types.

Signed-off-by: Cédric Le Goater <clg@...d.org>
---
 drivers/hwmon/ibmpowernv.c |   26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

Index: linux.git/drivers/hwmon/ibmpowernv.c
===================================================================
--- linux.git.orig/drivers/hwmon/ibmpowernv.c
+++ linux.git/drivers/hwmon/ibmpowernv.c
@@ -55,17 +55,27 @@ enum sensors {
 
 #define INVALID_INDEX (-1U)
 
+/*
+ * 'compatible' string properties for sensor types as defined in old
+ * PowerNV firmware (skiboot). These are ordered as 'enum sensors'.
+ */
+static const char * const legacy_compatibles[] = {
+	"ibm,opal-sensor-cooling-fan",
+	"ibm,opal-sensor-amb-temp",
+	"ibm,opal-sensor-power-supply",
+	"ibm,opal-sensor-power"
+};
+
 static struct sensor_group {
-	const char *name;
-	const char *compatible;
+	const char *name; /* matches property 'sensor-type' */
 	struct attribute_group group;
 	u32 attr_count;
 	u32 hwmon_index;
 } sensor_groups[] = {
-	{"fan", "ibm,opal-sensor-cooling-fan"},
-	{"temp", "ibm,opal-sensor-amb-temp"},
-	{"in", "ibm,opal-sensor-power-supply"},
-	{"power", "ibm,opal-sensor-power"}
+	{ "fan"   },
+	{ "temp"  },
+	{ "in"    },
+	{ "power" }
 };
 
 struct sensor_data {
@@ -239,8 +249,8 @@ static int get_sensor_type(struct device
 	enum sensors type;
 	const char *str;
 
-	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
-		if (of_device_is_compatible(np, sensor_groups[type].compatible))
+	for (type = 0; type < ARRAY_SIZE(legacy_compatibles); type++) {
+		if (of_device_is_compatible(np, legacy_compatibles[type]))
 			return type;
 	}