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Date:   Tue, 29 Aug 2017 18:06:03 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     eajames@...ux.vnet.ibm.com
Cc:     jdelvare@...e.com, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, corbet@....net,
        "Edward A. James" <eajames@...ibm.com>
Subject: Re: [v5, 2/3] hwmon: (pmbus): Add IBM Common Form Factor (CFF) power
 supply driver

On Mon, Aug 21, 2017 at 02:46:12PM -0500, eajames@...ux.vnet.ibm.com wrote:
> From: "Edward A. James" <eajames@...ibm.com>
> 
> Add the driver to monitor IBM CFF power supplies with hwmon over
> pmbus.
> 
> Signed-off-by: Edward A. James <eajames@...ibm.com>

Applied to hwmon-next with the following changes:

- "default n" is unnecessary.
- include jiffies.h is unnecessary, but we need to include bitops.h.

Thanks,
Guenter

> ---
>  drivers/hwmon/pmbus/Kconfig     |  10 +++
>  drivers/hwmon/pmbus/Makefile    |   1 +
>  drivers/hwmon/pmbus/ibm-cffps.c | 151 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 162 insertions(+)
>  create mode 100644 drivers/hwmon/pmbus/ibm-cffps.c
> 
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 68d717a..f3de18a 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -37,6 +37,16 @@ config SENSORS_ADM1275
>  	  This driver can also be built as a module. If so, the module will
>  	  be called adm1275.
>  
> +config SENSORS_IBM_CFFPS
> +	tristate "IBM Common Form Factor Power Supply"
> +	default n
> +	help
> +	  If you say yes here you get hardware monitoring support for the IBM
> +	  Common Form Factor power supply.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called ibm-cffps.
> +
>  config SENSORS_IR35221
>  	tristate "Infineon IR35221"
>  	default n
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 75bb7ca..737fa4e 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -5,6 +5,7 @@
>  obj-$(CONFIG_PMBUS)		+= pmbus_core.o
>  obj-$(CONFIG_SENSORS_PMBUS)	+= pmbus.o
>  obj-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o
> +obj-$(CONFIG_SENSORS_IBM_CFFPS)	+= ibm-cffps.o
>  obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o
>  obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
>  obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
> new file mode 100644
> index 0000000..1a6294c
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
> @@ -0,0 +1,151 @@
> +/*
> + * Copyright 2017 IBM Corp.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/jiffies.h>
> +#include <linux/module.h>
> +
> +#include "pmbus.h"
> +
> +/* STATUS_MFR_SPECIFIC bits */
> +#define CFFPS_MFR_FAN_FAULT			BIT(0)
> +#define CFFPS_MFR_THERMAL_FAULT			BIT(1)
> +#define CFFPS_MFR_OV_FAULT			BIT(2)
> +#define CFFPS_MFR_UV_FAULT			BIT(3)
> +#define CFFPS_MFR_PS_KILL			BIT(4)
> +#define CFFPS_MFR_OC_FAULT			BIT(5)
> +#define CFFPS_MFR_VAUX_FAULT			BIT(6)
> +#define CFFPS_MFR_CURRENT_SHARE_WARNING		BIT(7)
> +
> +static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
> +				    int reg)
> +{
> +	int rc, mfr;
> +
> +	switch (reg) {
> +	case PMBUS_STATUS_VOUT:
> +	case PMBUS_STATUS_IOUT:
> +	case PMBUS_STATUS_TEMPERATURE:
> +	case PMBUS_STATUS_FAN_12:
> +		rc = pmbus_read_byte_data(client, page, reg);
> +		if (rc < 0)
> +			return rc;
> +
> +		mfr = pmbus_read_byte_data(client, page,
> +					   PMBUS_STATUS_MFR_SPECIFIC);
> +		if (mfr < 0)
> +			/*
> +			 * Return the status register instead of an error,
> +			 * since we successfully read status.
> +			 */
> +			return rc;
> +
> +		/* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
> +		if (reg == PMBUS_STATUS_FAN_12) {
> +			if (mfr & CFFPS_MFR_FAN_FAULT)
> +				rc |= PB_FAN_FAN1_FAULT;
> +		} else if (reg == PMBUS_STATUS_TEMPERATURE) {
> +			if (mfr & CFFPS_MFR_THERMAL_FAULT)
> +				rc |= PB_TEMP_OT_FAULT;
> +		} else if (reg == PMBUS_STATUS_VOUT) {
> +			if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
> +				rc |= PB_VOLTAGE_OV_FAULT;
> +			if (mfr & CFFPS_MFR_UV_FAULT)
> +				rc |= PB_VOLTAGE_UV_FAULT;
> +		} else if (reg == PMBUS_STATUS_IOUT) {
> +			if (mfr & CFFPS_MFR_OC_FAULT)
> +				rc |= PB_IOUT_OC_FAULT;
> +			if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
> +				rc |= PB_CURRENT_SHARE_FAULT;
> +		}
> +		break;
> +	default:
> +		rc = -ENODATA;
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
> +				    int reg)
> +{
> +	int rc, mfr;
> +
> +	switch (reg) {
> +	case PMBUS_STATUS_WORD:
> +		rc = pmbus_read_word_data(client, page, reg);
> +		if (rc < 0)
> +			return rc;
> +
> +		mfr = pmbus_read_byte_data(client, page,
> +					   PMBUS_STATUS_MFR_SPECIFIC);
> +		if (mfr < 0)
> +			/*
> +			 * Return the status register instead of an error,
> +			 * since we successfully read status.
> +			 */
> +			return rc;
> +
> +		if (mfr & CFFPS_MFR_PS_KILL)
> +			rc |= PB_STATUS_OFF;
> +		break;
> +	default:
> +		rc = -ENODATA;
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static struct pmbus_driver_info ibm_cffps_info = {
> +	.pages = 1,
> +	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> +		PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
> +		PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
> +		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
> +		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
> +	.read_byte_data = ibm_cffps_read_byte_data,
> +	.read_word_data = ibm_cffps_read_word_data,
> +};
> +
> +static int ibm_cffps_probe(struct i2c_client *client,
> +			   const struct i2c_device_id *id)
> +{
> +	return pmbus_do_probe(client, id, &ibm_cffps_info);
> +}
> +
> +static const struct i2c_device_id ibm_cffps_id[] = {
> +	{ "ibm_cffps1", 1 },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
> +
> +static const struct of_device_id ibm_cffps_of_match[] = {
> +	{ .compatible = "ibm,cffps1" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
> +
> +static struct i2c_driver ibm_cffps_driver = {
> +	.driver = {
> +		.name = "ibm-cffps",
> +		.of_match_table = ibm_cffps_of_match,
> +	},
> +	.probe = ibm_cffps_probe,
> +	.remove = pmbus_do_remove,
> +	.id_table = ibm_cffps_id,
> +};
> +
> +module_i2c_driver(ibm_cffps_driver);
> +
> +MODULE_AUTHOR("Eddie James");
> +MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
> +MODULE_LICENSE("GPL");

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