[PATCH linux dev-4.10 v5 2/4] hwmon: (pmbus): Add IBM Common Form Factor (CFF) power supply driver
Andrew Jeffery
andrew at aj.id.au
Mon Aug 14 17:33:58 AEST 2017
On Fri, 2017-08-11 at 12:56 -0500, Eddie James wrote:
> > From: "Edward A. James" <eajames at us.ibm.com>
>
> Add the driver to monitor IBM CFF power supplies with hwmon over
> pmbus.
>
> > Signed-off-by: Edward A. James <eajames at us.ibm.com>
> ---
> 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 04f6baa..c05b264 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 663801c..d3d0b2e 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,
I feel you should also be setting the format field where relevant. In some
spots the documentation suggests different formats are used across the
different capabilities. However as a fallback it states:
The power supply will report all values using the linear data formats,
unless otherwise specified. The power supply will accept values using
only the linear data formats unless otherwise specified.
The "otherwise specified" cases aren't covered by the driver or the core, so
you're out of the woods there.
However, it happens that the linear enum value is '0' and so the driver works
implicitly due to the way you're initialising the structure. I think it's
better to be explicit rather than implicit, otherwise it just looks like an
omission.
I would prefer we add something like:
.format[PSC_VOLTAGE_IN] = linear;
.format[PSC_VOLTAGE_OUT] = linear;
.format[PSC_CURRENT_OUT] = linear;
.format[PSC_POWER] = linear;
.format[PSC_FAN] = linear;
.format[PSC_TEMPERATURE] = linear;
That said, it's a bit of a nit as it should work regardless. I'd be happy with
a follow-up patch adding the format assignments in.
Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
> > + .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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