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Message-ID: <CAO=notz=kRjv4sA5tB9LOC1kZUdNFQ0cdUSxgaxM6dJUigo2-A@mail.gmail.com>
Date: Mon, 15 Apr 2019 15:29:17 -0700
From: Patrick Venture <venture@...gle.com>
To: Patrick Venture <venture@...gle.com>,
Guenter Roeck <linux@...ck-us.net>, jdelvare@...e.com,
Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
Cc: Maxim Sloyko <maxims@...gle.com>, Kun Yi <kunyi@...gle.com>,
linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Robert Lippert <rlippert@...gle.com>
Subject: Re: [PATCH v6] hwmon: (pmbus/isl68137): Add driver for Intersil
ISL68137 PWM Controller
On Mon, Apr 15, 2019 at 3:28 PM Patrick Venture <venture@...gle.com> wrote:
>
> From: Maxim Sloyko <maxims@...gle.com>
>
> Intersil ISL68137 is a digital output 7-phase configurable PWM
> controller with an AVSBus interface.
>
> Signed-off-by: Maxim Sloyko <maxims@...gle.com>
> Signed-off-by: Robert Lippert <rlippert@...gle.com>
> Signed-off-by: Patrick Venture <venture@...gle.com>
I trim out a bunch beneath this, so maybe that's causing corruption?
For instance, all the Google footers, etc, is cut out manually. If
that's an issue for the patch email hash, I can do that in the commit
log -- since it may include the commit message.
> ---
> v6:
> Fix reversed logic bug.
> v5:
> Drop extra parens
> Drop extra parameter check
> v4:
> Use kstrtobool
> Cleanup parens
> Use rc instead of temporary int
> Delete unnecessary coment
> Add remove to driver structure
> v3:
> Added missing driver documentation
> Cleaned up goto statements.
> Add missing error check on pmbus_read_word_data
> Transitioned to use SENSOR_DEVICE_ATTR_RW
> Renamed enabled attribute to enable
> Set up an attribute_group for the enable attribute and added to pmbus_info
> Removed the boilerplate driver remove method
> v2:
> Fixed bad header ordering.
> v1:
> Original new patchset with fixes from Rob Lippert.
> ---
> Documentation/hwmon/isl68137 | 72 ++++++++++++++
> drivers/hwmon/pmbus/Kconfig | 9 ++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/isl68137.c | 169 +++++++++++++++++++++++++++++++++
> 4 files changed, 251 insertions(+)
> create mode 100644 Documentation/hwmon/isl68137
> create mode 100644 drivers/hwmon/pmbus/isl68137.c
>
> diff --git a/Documentation/hwmon/isl68137 b/Documentation/hwmon/isl68137
> new file mode 100644
> index 0000000000000..92e5c5fc5b777
> --- /dev/null
> +++ b/Documentation/hwmon/isl68137
> @@ -0,0 +1,72 @@
> +Kernel driver isl68137
> +======================
> +
> +Supported chips:
> + * Intersil ISL68137
> + Prefix: 'isl68137'
> + Addresses scanned: -
> + Datasheet: Publicly available at the Intersil website
> + https://www.intersil.com/content/dam/Intersil/documents/isl6/isl68137.pdf
> +
> +Authors:
> + Maxim Sloyko <maxims@...gle.com>
> + Robert Lippert <rlippert@...gle.com>
> + Patrick Venture <venture@...gle.com>
> +
> +Description
> +-----------
> +
> +Intersil ISL68137 is a digital output 7-phase configurable PWM
> +controller with an AVSBus interface.
> +
> +Usage Notes
> +-----------
> +
> +This driver does not probe for PMBus devices. You will have to instantiate
> +devices explicitly.
> +
> +The ISL68137 AVS operation mode must be enabled/disabled at runtime.
> +
> +Beyond the normal sysfs pmbus attributes, the driver exposes a control attribute.
> +
> +Additional Sysfs attributes
> +---------------------------
> +
> +avs(0|1)_enable Controls the AVS state of each rail.
> +
> +curr1_label "iin"
> +curr1_input Measured input current
> +curr1_crit Critical maximum current
> +curr1_crit_alarm Current critical high alarm
> +
> +curr[2-3]_label "iout[1-2]"
> +curr[2-3]_input Measured output current
> +curr[2-3]_crit Critical maximum current
> +curr[2-3]_crit_alarm Current critical high alarm
> +
> +in1_label "vin"
> +in1_input Measured input voltage
> +in1_lcrit Critical minimum input voltage
> +in1_lcrit_alarm Input voltage critical low alarm
> +in1_crit Critical maximum input voltage
> +in1_crit_alarm Input voltage critical high alarm
> +
> +in[2-3]_label "vout[1-2]"
> +in[2-3]_input Measured output voltage
> +in[2-3]_lcrit Critical minimum output voltage
> +in[2-3]_lcrit_alarm Output voltage critical low alarm
> +in[2-3]_crit Critical maximum output voltage
> +in[2-3]_crit_alarm Output voltage critical high alarm
> +
> +power1_label "pin"
> +power1_input Measured input power
> +power1_alarm Input power high alarm
> +
> +power[2-3]_label "pout[1-2]"
> +power[2-3]_input Measured output power
> +
> +temp[1-3]_input Measured temperature
> +temp[1-3]_crit Critical high temperature
> +temp[1-3]_crit_alarm Chip temperature critical high alarm
> +temp[1-3]_max Maximum temperature
> +temp[1-3]_max_alarm Chip temperature high alarm
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index de87abab990e5..7edab7e30eaf9 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -63,6 +63,15 @@ config SENSORS_IR38064
> This driver can also be built as a module. If so, the module will
> be called ir38064.
>
> +config SENSORS_ISL68137
> + tristate "Intersil ISL68137"
> + help
> + If you say yes here you get hardware monitoring support for Intersil
> + ISL68137.
> +
> + This driver can also be built as a module. If so, the module will
> + be called isl68137.
> +
> config SENSORS_LM25066
> tristate "National Semiconductor LM25066 and compatibles"
> help
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 7d1fa6b3c8c93..2219b93003167 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
> obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
> obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
> obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
> +obj-$(CONFIG_SENSORS_ISL68137) += isl68137.o
> obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
> obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
> obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
> diff --git a/drivers/hwmon/pmbus/isl68137.c b/drivers/hwmon/pmbus/isl68137.c
> new file mode 100644
> index 0000000000000..515596c92fe1c
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/isl68137.c
> @@ -0,0 +1,169 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Hardware monitoring driver for Intersil ISL68137
> + *
> + * Copyright (c) 2017 Google Inc
> + *
> + */
> +
> +#include <linux/err.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/string.h>
> +#include <linux/sysfs.h>
> +#include "pmbus.h"
> +
> +#define ISL68137_VOUT_AVS 0x30
> +
> +static ssize_t isl68137_avs_enable_show_page(struct i2c_client *client,
> + int page,
> + char *buf)
> +{
> + int val = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
> +
> + return sprintf(buf, "%d\n",
> + (val & ISL68137_VOUT_AVS) == ISL68137_VOUT_AVS ? 1 : 0);
> +}
> +
> +static ssize_t isl68137_avs_enable_store_page(struct i2c_client *client,
> + int page,
> + const char *buf, size_t count)
> +{
> + int rc, op_val;
> + bool result;
> +
> + rc = kstrtobool(buf, &result);
> + if (rc)
> + return rc;
> +
> + op_val = result ? ISL68137_VOUT_AVS : 0;
> +
> + /*
> + * Writes to VOUT setpoint over AVSBus will persist after the VRM is
> + * switched to PMBus control. Switching back to AVSBus control
> + * restores this persisted setpoint rather than re-initializing to
> + * PMBus VOUT_COMMAND. Writing VOUT_COMMAND first over PMBus before
> + * enabling AVS control is the workaround.
> + */
> + if (op_val == ISL68137_VOUT_AVS) {
> + rc = pmbus_read_word_data(client, page, PMBUS_VOUT_COMMAND);
> + if (rc < 0)
> + return rc;
> +
> + rc = pmbus_write_word_data(client, page, PMBUS_VOUT_COMMAND,
> + rc);
> + if (rc < 0)
> + return rc;
> + }
> +
> + rc = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
> + ISL68137_VOUT_AVS, op_val);
> +
> + return (rc < 0) ? rc : count;
> +}
> +
> +static ssize_t isl68137_avs_enable_show(struct device *dev,
> + struct device_attribute *devattr,
> + char *buf)
> +{
> + struct i2c_client *client = to_i2c_client(dev->parent);
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +
> + return isl68137_avs_enable_show_page(client, attr->index, buf);
> +}
> +
> +static ssize_t isl68137_avs_enable_store(struct device *dev,
> + struct device_attribute *devattr,
> + const char *buf, size_t count)
> +{
> + struct i2c_client *client = to_i2c_client(dev->parent);
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> +
> + return isl68137_avs_enable_store_page(client, attr->index, buf, count);
> +}
> +
> +static SENSOR_DEVICE_ATTR_RW(avs0_enable, isl68137_avs_enable, 0);
> +static SENSOR_DEVICE_ATTR_RW(avs1_enable, isl68137_avs_enable, 1);
> +
> +static struct attribute *enable_attrs[] = {
> + &sensor_dev_attr_avs0_enable.dev_attr.attr,
> + &sensor_dev_attr_avs1_enable.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group enable_group = {
> + .attrs = enable_attrs,
> +};
> +
> +static const struct attribute_group *attribute_groups[] = {
> + &enable_group,
> + NULL,
> +};
> +
> +static struct pmbus_driver_info isl68137_info = {
> + .pages = 2,
> + .format[PSC_VOLTAGE_IN] = direct,
> + .format[PSC_VOLTAGE_OUT] = direct,
> + .format[PSC_CURRENT_IN] = direct,
> + .format[PSC_CURRENT_OUT] = direct,
> + .format[PSC_POWER] = direct,
> + .format[PSC_TEMPERATURE] = direct,
> + .m[PSC_VOLTAGE_IN] = 1,
> + .b[PSC_VOLTAGE_IN] = 0,
> + .R[PSC_VOLTAGE_IN] = 3,
> + .m[PSC_VOLTAGE_OUT] = 1,
> + .b[PSC_VOLTAGE_OUT] = 0,
> + .R[PSC_VOLTAGE_OUT] = 3,
> + .m[PSC_CURRENT_IN] = 1,
> + .b[PSC_CURRENT_IN] = 0,
> + .R[PSC_CURRENT_IN] = 2,
> + .m[PSC_CURRENT_OUT] = 1,
> + .b[PSC_CURRENT_OUT] = 0,
> + .R[PSC_CURRENT_OUT] = 1,
> + .m[PSC_POWER] = 1,
> + .b[PSC_POWER] = 0,
> + .R[PSC_POWER] = 0,
> + .m[PSC_TEMPERATURE] = 1,
> + .b[PSC_TEMPERATURE] = 0,
> + .R[PSC_TEMPERATURE] = 0,
> + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
> + | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
> + | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP
> + | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
> + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
> + .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
> + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT,
> + .groups = attribute_groups,
> +};
> +
> +static int isl68137_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + return pmbus_do_probe(client, id, &isl68137_info);
> +}
> +
> +static const struct i2c_device_id isl68137_id[] = {
> + {"isl68137", 0},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, isl68137_id);
> +
> +/* This is the driver that will be inserted */
> +static struct i2c_driver isl68137_driver = {
> + .driver = {
> + .name = "isl68137",
> + },
> + .probe = isl68137_probe,
> + .remove = pmbus_do_remove,
> + .id_table = isl68137_id,
> +};
> +
> +module_i2c_driver(isl68137_driver);
> +
> +MODULE_AUTHOR("Maxim Sloyko <maxims@...gle.com>");
> +MODULE_DESCRIPTION("PMBus driver for Intersil ISL68137");
> +MODULE_LICENSE("GPL");
> --
> 2.21.0.392.gf8f6787159e-goog
>
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