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Date: Fri, 30 Apr 2021 06:12:17 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Robert Marko <robert.marko@...tura.hr>, lee.jones@...aro.org,
robh+dt@...nel.org, linus.walleij@...aro.org,
bgolaszewski@...libre.com, jdelvare@...e.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-hwmon@...r.kernel.org
Cc: luka.perkov@...tura.hr, jmp@...phyte.org, pmenzel@...gen.mpg.de,
buczek@...gen.mpg.de
Subject: Re: [PATCH 4/6] hwmon: Add Delta TN48M CPLD HWMON driver
On 4/30/21 5:35 AM, Robert Marko wrote:
> Delta TN48M has a CPLD that also monitors the power supply
> statuses.
>
> These are useful to be presented to the users, so lets
> add a driver for HWMON part of the CPLD.
>
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
> drivers/hwmon/Kconfig | 10 +++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/tn48m-hwmon.c | 148 ++++++++++++++++++++++++++++++++++++
> drivers/mfd/tn48m-cpld.c | 3 +
> include/linux/mfd/tn48m.h | 1 +
> 5 files changed, 163 insertions(+)
> create mode 100644 drivers/hwmon/tn48m-hwmon.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 54f04e61fb83..89271dfeb775 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1924,6 +1924,16 @@ config SENSORS_TMP513
> This driver can also be built as a module. If so, the module
> will be called tmp513.
>
> +config SENSORS_TN48M
> + tristate "Delta Networks TN48M switch CPLD HWMON driver"
> + depends on MFD_TN48M_CPLD
> + help
> + If you say yes here you get support for Delta Networks TN48M
> + CPLD.
> +
> + This driver can also be built as a module. If so, the module
> + will be called tn48m-hwmon.
> +
> config SENSORS_VEXPRESS
> tristate "Versatile Express"
> depends on VEXPRESS_CONFIG
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index fe38e8a5c979..22e470057ffe 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -187,6 +187,7 @@ obj-$(CONFIG_SENSORS_TMP108) += tmp108.o
> obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
> obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
> obj-$(CONFIG_SENSORS_TMP513) += tmp513.o
> +obj-$(CONFIG_SENSORS_TN48M) += tn48m-hwmon.o
> obj-$(CONFIG_SENSORS_VEXPRESS) += vexpress-hwmon.o
> obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
> obj-$(CONFIG_SENSORS_VIA686A) += via686a.o
> diff --git a/drivers/hwmon/tn48m-hwmon.c b/drivers/hwmon/tn48m-hwmon.c
> new file mode 100644
> index 000000000000..80fd18d74f1d
> --- /dev/null
> +++ b/drivers/hwmon/tn48m-hwmon.c
> @@ -0,0 +1,148 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Delta TN48M CPLD HWMON driver
> + *
> + * Copyright 2020 Sartura Ltd
> + *
> + * Author: Robert Marko <robert.marko@...tura.hr>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/hwmon.h>
> +#include <linux/kernel.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/mfd/tn48m.h>
> +
> +#define PSU1_PRESENT_MASK BIT(0)
> +#define PSU2_PRESENT_MASK BIT(1)
> +#define PSU1_POWERGOOD_MASK BIT(2)
> +#define PSU2_POWERGOOD_MASK BIT(3)
> +#define PSU1_ALERT_MASK BIT(4)
> +#define PSU2_ALERT_MASK BIT(5)
> +
> +static int board_id_get(struct tn48m_data *data)
> +{
> + unsigned int regval;
> +
> + regmap_read(data->regmap, BOARD_ID, ®val);
> +
> + switch (regval) {
> + case BOARD_ID_TN48M:
> + return BOARD_ID_TN48M;
> + case BOARD_ID_TN48M_P:
> + return BOARD_ID_TN48M_P;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static ssize_t psu_present_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
> + struct tn48m_data *data = dev_get_drvdata(dev);
> + unsigned int regval, status;
> +
> + if (board_id_get(data) == BOARD_ID_TN48M_P) {
> + regmap_read(data->regmap, attr2->nr, ®val);
> +
> + if (attr2->index == 1)
> + status = !FIELD_GET(PSU1_PRESENT_MASK, regval);
> + else
> + status = !FIELD_GET(PSU2_PRESENT_MASK, regval);
> + } else
> + status = 0;
> +
> + return sprintf(buf, "%d\n", status);
> +}
> +
> +static ssize_t psu_pg_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
> + struct tn48m_data *data = dev_get_drvdata(dev);
> + unsigned int regval, status;
> +
> + regmap_read(data->regmap, attr2->nr, ®val);
> +
> + if (attr2->index == 1)
> + status = FIELD_GET(PSU1_POWERGOOD_MASK, regval);
> + else
> + status = FIELD_GET(PSU2_POWERGOOD_MASK, regval);
> +
> + return sprintf(buf, "%d\n", status);
> +}
> +
> +static ssize_t psu_alert_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
> + struct tn48m_data *data = dev_get_drvdata(dev);
> + unsigned int regval, status;
> +
> + if (board_id_get(data) == BOARD_ID_TN48M_P) {
> + regmap_read(data->regmap, attr2->nr, ®val);
> +
> + if (attr2->index == 1)
> + status = !FIELD_GET(PSU1_ALERT_MASK, regval);
> + else
> + status = !FIELD_GET(PSU2_ALERT_MASK, regval);
> + } else
> + status = 0;
> +
> + return sprintf(buf, "%d\n", status);
> +}
> +
> +static SENSOR_DEVICE_ATTR_2_RO(psu1_present, psu_present, PSU_STATUS, 1);
> +static SENSOR_DEVICE_ATTR_2_RO(psu2_present, psu_present, PSU_STATUS, 2);
> +static SENSOR_DEVICE_ATTR_2_RO(psu1_pg, psu_pg, PSU_STATUS, 1);
> +static SENSOR_DEVICE_ATTR_2_RO(psu2_pg, psu_pg, PSU_STATUS, 2);
> +static SENSOR_DEVICE_ATTR_2_RO(psu1_alert, psu_alert, PSU_STATUS, 1);
> +static SENSOR_DEVICE_ATTR_2_RO(psu2_alert, psu_alert, PSU_STATUS, 2);
> +
> +static struct attribute *tn48m_hwmon_attrs[] = {
> + &sensor_dev_attr_psu1_present.dev_attr.attr,
> + &sensor_dev_attr_psu2_present.dev_attr.attr,
> + &sensor_dev_attr_psu1_pg.dev_attr.attr,
> + &sensor_dev_attr_psu2_pg.dev_attr.attr,
> + &sensor_dev_attr_psu1_alert.dev_attr.attr,
> + &sensor_dev_attr_psu2_alert.dev_attr.attr,
Literally none of those attributes are standard hwmon attributes.
I don't know what this is, but it is not a hardware monitoring driver.
> + NULL
> +};
> +
> +ATTRIBUTE_GROUPS(tn48m_hwmon);
> +
> +static int tn48m_hwmon_probe(struct platform_device *pdev)
> +{
> + struct tn48m_data *data = dev_get_drvdata(pdev->dev.parent);
> + struct device *hwmon_dev;
> +
> + hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
> + "tn48m_hwmon",
> + data,
> + tn48m_hwmon_groups);
Please use devm_hwmon_device_register_with_info() to register hwmon devices.
Of course, that only makes sense for actual hardware monitoring drivers
which do support standard attributes.
> + return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct platform_device_id tn48m_hwmon_id_table[] = {
> + { "delta,tn48m-hwmon", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(platform, tn48m_hwmon_id_table);
> +
> +static struct platform_driver tn48m_hwmon_driver = {
> + .driver = {
> + .name = "tn48m-hwmon",
> + },
> + .probe = tn48m_hwmon_probe,
> + .id_table = tn48m_hwmon_id_table,
> +};
> +module_platform_driver(tn48m_hwmon_driver);
> +
> +MODULE_AUTHOR("Robert Marko <robert.marko@...tura.hr>");
> +MODULE_DESCRIPTION("Delta TN48M CPLD HWMON driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/mfd/tn48m-cpld.c b/drivers/mfd/tn48m-cpld.c
> index f22a15ddd22d..4d837aca01e7 100644
> --- a/drivers/mfd/tn48m-cpld.c
> +++ b/drivers/mfd/tn48m-cpld.c
> @@ -20,6 +20,9 @@
> static const struct mfd_cell tn48m_cell[] = {
> {
> .name = "delta,tn48m-gpio",
> + },
> + {
> + .name = "delta,tn48m-hwmon",
> }
> };
>
> diff --git a/include/linux/mfd/tn48m.h b/include/linux/mfd/tn48m.h
> index 9cc2b04c8d69..eb2cfc3a5db7 100644
> --- a/include/linux/mfd/tn48m.h
> +++ b/include/linux/mfd/tn48m.h
> @@ -22,6 +22,7 @@
> #define SFP_TX_DISABLE 0x31
> #define SFP_PRESENT 0x3a
> #define SFP_LOS 0x40
> +#define PSU_STATUS 0xa
>
> struct tn48m_data {
> struct device *dev;
>
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