linux-kernel - Re: [PATCH 2/2] hwmon: (pmbus/ibm-cffps) Add version detection capability

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Message-ID: <20191017133609.GA23473@roeck-us.net>
Date:   Thu, 17 Oct 2019 06:36:09 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, jdelvare@...e.com,
        mark.rutland@....com, robh+dt@...nel.org
Subject: Re: [PATCH 2/2] hwmon: (pmbus/ibm-cffps) Add version detection
 capability

On Wed, Oct 09, 2019 at 02:11:02PM -0500, Eddie James wrote:
> Some systems may plug in either version 1 or version 2 of the IBM common
> form factor power supply. Add a version-less compatibility string that
> tells the driver to try and detect which version of the power supply is
> connected.
> 
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/pmbus/ibm-cffps.c | 37 +++++++++++++++++++++++++++++++++----
>  1 file changed, 33 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
> index d44745e..d61547e 100644
> --- a/drivers/hwmon/pmbus/ibm-cffps.c
> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
> @@ -3,6 +3,7 @@
>   * Copyright 2017 IBM Corp.
>   */
>  
> +#include <linux/bitfield.h>
>  #include <linux/bitops.h>
>  #include <linux/debugfs.h>
>  #include <linux/device.h>
> @@ -29,6 +30,10 @@
>  #define CFFPS_INPUT_HISTORY_CMD			0xD6
>  #define CFFPS_INPUT_HISTORY_SIZE		100
>  
> +#define CFFPS_CCIN_VERSION			GENMASK(15, 8)
> +#define CFFPS_CCIN_VERSION_1			 0x2b
> +#define CFFPS_CCIN_VERSION_2			 0x2e
> +
>  /* STATUS_MFR_SPECIFIC bits */
>  #define CFFPS_MFR_FAN_FAULT			BIT(0)
>  #define CFFPS_MFR_THERMAL_FAULT			BIT(1)
> @@ -54,7 +59,7 @@ enum {
>  	CFFPS_DEBUGFS_NUM_ENTRIES
>  };
>  
> -enum versions { cffps1, cffps2 };
> +enum versions { cffps1, cffps2, cffps_unknown };
>  
>  struct ibm_cffps_input_history {
>  	struct mutex update_lock;
> @@ -395,7 +400,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  			   const struct i2c_device_id *id)
>  {
>  	int i, rc;
> -	enum versions vs;
> +	enum versions vs = cffps_unknown;
>  	struct dentry *debugfs;
>  	struct dentry *ibm_cffps_dir;
>  	struct ibm_cffps *psu;
> @@ -405,8 +410,27 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  		vs = (enum versions)md;
>  	else if (id)
>  		vs = (enum versions)id->driver_data;
> -	else
> -		vs = cffps1;
> +
> +	if (vs == cffps_unknown) {
> +		u16 ccin_version = CFFPS_CCIN_VERSION_1;
> +		int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
> +
> +		if (ccin > 0)
> +			ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
> +
> +		switch (ccin_version) {
> +		default:
> +		case CFFPS_CCIN_VERSION_1:
> +			vs = cffps1;
> +			break;
> +		case CFFPS_CCIN_VERSION_2:
> +			vs = cffps2;
> +			break;
> +		}
> +
> +		/* Set the client name to include the version number. */
> +		snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
> +	}
>  
>  	client->dev.platform_data = &ibm_cffps_pdata;
>  	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
> @@ -465,6 +489,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  static const struct i2c_device_id ibm_cffps_id[] = {
>  	{ "ibm_cffps1", cffps1 },
>  	{ "ibm_cffps2", cffps2 },
> +	{ "ibm_cffps", cffps_unknown },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
> @@ -478,6 +503,10 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  		.compatible = "ibm,cffps2",
>  		.data = (void *)cffps2
>  	},
> +	{
> +		.compatible = "ibm,cffps",
> +		.data = (void *)cffps_unknown
> +	},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);