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Date: Thu, 10 Aug 2017 18:18:07 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Eddie James <eajames@...ux.vnet.ibm.com>
Cc: robh+dt@...nel.org, jdelvare@...e.com,
linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
joel@....id.au, jk@...abs.org, andrew@...id.au,
mark.rutland@....com, devicetree@...r.kernel.org, corbet@....net,
linux-doc@...r.kernel.org, "Edward A. James" <eajames@...ibm.com>
Subject: Re: [PATCH v2 2/3] hwmon: (pmbus): Add POWER system power supply
driver
On Thu, Aug 10, 2017 at 05:19:45PM -0500, Eddie James wrote:
> From: "Edward A. James" <eajames@...ibm.com>
>
> Add the driver to monitor POWER system power supplies with hwmon over
> pmbus.
>
> Signed-off-by: Edward A. James <eajames@...ibm.com>
> ---
> drivers/hwmon/pmbus/Kconfig | 10 +++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/powerps.c | 144 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 155 insertions(+)
> create mode 100644 drivers/hwmon/pmbus/powerps.c
>
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 68d717a..8925c1a 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -125,6 +125,16 @@ config SENSORS_MAX8688
> This driver can also be built as a module. If so, the module will
> be called max8688.
>
> +config SENSORS_POWERPS
> + tristate "IBM POWER System Power Supply"
> + default n
> + help
> + If you say yes here you get hardware monitoring support for the IBM
> + POWER system power supply.
> +
> + This driver can also be built as a module. If so, the module will
> + be called powerps.
> +
> config SENSORS_TPS40422
> tristate "TI TPS40422"
> default n
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 75bb7ca..3303af5 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
> obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
> obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
> obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
> +obj-$(CONFIG_SENSORS_POWERPS) += powerps.o
> obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
> obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
> obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
> diff --git a/drivers/hwmon/pmbus/powerps.c b/drivers/hwmon/pmbus/powerps.c
> new file mode 100644
> index 0000000..21d28f2
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/powerps.c
> @@ -0,0 +1,144 @@
> +/*
> + * 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 POWERPS_MFR_FAN_FAULT BIT(0)
> +#define POWERPS_MFR_THERMAL_FAULT BIT(1)
> +#define POWERPS_MFR_OV_FAULT BIT(2)
> +#define POWERPS_MFR_UV_FAULT BIT(3)
> +#define POWERPS_MFR_PS_KILL BIT(4)
> +#define POWERPS_MFR_OC_FAULT BIT(5)
> +#define POWERPS_MFR_VAUX_FAULT BIT(6)
> +#define POWERPS_MFR_CURRENT_SHARE_WARNING BIT(7)
> +
> +static int powerps_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 rc;
return mfr; ?
> +
> + /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
> + if (reg == PMBUS_STATUS_FAN_12) {
> + if (mfr & POWERPS_MFR_FAN_FAULT)
> + rc |= PB_FAN_FAN1_FAULT;
> + } else if (reg == PMBUS_STATUS_TEMPERATURE) {
> + if (mfr & POWERPS_MFR_THERMAL_FAULT)
> + rc |= PB_TEMP_OT_FAULT;
> + } else if (reg == PMBUS_STATUS_VOUT) {
> + if (mfr &
> + (POWERPS_MFR_OV_FAULT | POWERPS_MFR_VAUX_FAULT))
Wondering - this suggests that there is a VAUX. Would it make sense
to map it to PMBUS_VIRT_READ_VMON ?
> + rc |= PB_VOLTAGE_OV_FAULT;
> + if (mfr & POWERPS_MFR_UV_FAULT)
> + rc |= PB_VOLTAGE_UV_FAULT;
> + } else if (reg == PMBUS_STATUS_IOUT) {
> + if (mfr & POWERPS_MFR_OC_FAULT)
> + rc |= PB_IOUT_OC_FAULT;
> + if (mfr & POWERPS_MFR_CURRENT_SHARE_WARNING)
> + rc |= PB_CURRENT_SHARE_FAULT;
> + }
> + break;
> + default:
> + rc = -ENODATA;
> + break;
> + }
> +
> + return rc;
> +}
> +
> +static int powerps_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 rc;
return mfr; ?
> +
> + if (mfr & POWERPS_MFR_PS_KILL)
> + rc |= PB_STATUS_OFF;
> + break;
> + default:
> + rc = -ENODATA;
> + break;
> + }
> +
> + return rc;
> +}
> +
> +static struct pmbus_driver_info powerps_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 = powerps_read_byte_data,
> + .read_word_data = powerps_read_word_data,
> + .debugfs = true,
> +};
> +
> +static int powerps_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + return pmbus_do_probe(client, id, &powerps_info);
> +}
> +
> +static const struct i2c_device_id powerps_id[] = {
> + { "power_ps", 1 },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, powerps_id);
> +
> +/* IBM provides many compatible power supplies; use a generic name. */
> +static const struct of_device_id powerps_of_match[] = {
> + { .compatible = "ibm,power-ps" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, powerps_of_match);
> +
> +static struct i2c_driver powerps_driver = {
> + .driver = {
> + .name = "powerps",
> + .of_match_table = powerps_of_match,
> + },
> + .probe = powerps_probe,
> + .remove = pmbus_do_remove,
> + .id_table = powerps_id,
> +};
> +
> +module_i2c_driver(powerps_driver);
> +
> +MODULE_AUTHOR("Eddie James");
> +MODULE_DESCRIPTION("PMBus driver for POWER system power supplies");
> +MODULE_LICENSE("GPL");
> --
> 1.8.3.1
>
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