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SubjectRe: [PATCH v3] hwmon:Driver for Delta power supplies
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Date
On 9/22/20 1:37 AM, xiao.mx.ma wrote:
> From: Delta <xiao.mx.ma@deltaww.com>
>
> The <drivers/hwmon/pmbus/delta.c> provides a driver for Delta's modules.
> Currently supports Q54SJ108A2 series and other series will continue to be
> added in the future.
>
> Signed-off-by: Delta <xiao.mx.ma@deltaww.com>
>
> Add delta.rst to Documentation/hwmon/index.rst.
> Tristate "DELTA_POWER_SUPPLIES" in Kconfig is changed to "Delta Power
> Supplies".

Nit: This should go after '---', and you should list the v2 changes as well.

Now that I can actually look at the code, I wonder if the driver is even needed.
Adding something like
{"q54Sj108a2", (kernel_ulong_t)&pmbus_info_one},
(or uppercase, if you prefer) to drivers/hwmon/pmbus/pmbus.c should accomplish
the same. Can you explain ? If the separate driver is indeed needed, that
explanation will have to be in the commit description for reference.

Thanks,
Guenter

> ---
> Documentation/hwmon/delta.rst | 52 +++++++++++++
> Documentation/hwmon/index.rst | 1 +
> drivers/hwmon/pmbus/Kconfig | 9 +++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/delta.c | 136 ++++++++++++++++++++++++++++++++++
> 5 files changed, 199 insertions(+)
> create mode 100644 Documentation/hwmon/delta.rst
> create mode 100644 drivers/hwmon/pmbus/delta.c
>
> diff --git a/Documentation/hwmon/delta.rst b/Documentation/hwmon/delta.rst
> new file mode 100644
> index 000000000000..ee63b3b9b86d
> --- /dev/null
> +++ b/Documentation/hwmon/delta.rst
> @@ -0,0 +1,52 @@
> +Kernel driver delta
> +=====================
> +
> +Supported chips:
> +
> + * DELTA Q54SJ108A2NCAH, Q54SJ108A2NCDH, Q54SJ108A2NCPG, Q54SJ108A2NCPH
> +
> + Prefix: 'Q54SJ108A2'
> +
> + Addresses scanned: -
> +
> + Datasheet: https://filecenter.delta-china.com.cn/products/download/01/0102/datasheet/DS_Q54SJ108A2.pdf
> +
> +Authors:
> + Delta <xiao.mx.ma@deltaww.com>
> +
> +
> +Description
> +-----------
> +
> +This driver implements support for DELTA Q54SJ108A2NCAH, Q54SJ108A2NCDH,
> +Q54SJ108A2NCPG, and Q54SJ108A2NCPH 1/4 Brick DC/DC Regulated Power Module
> +with PMBus support.
> +
> +The driver is a client driver to the core PMBus driver.
> +Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
> +
> +
> +Usage Notes
> +-----------
> +
> +This driver does not auto-detect devices. You will have to instantiate the
> +devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
> +details.
> +
> +
> +Sysfs entries
> +-------------
> +
> +=================== ===== =======================================================
> +curr1_alarm RO Output current alarm
> +curr1_input RO Output current
> +curr1_label RO 'iout1'
> +in1_alarm RO Input voltage alarm
> +in1_input RO Input voltage
> +in1_label RO 'vin'
> +in2_alarm RO Output voltage alarm
> +in2_input RO Output voltage
> +in2_label RO 'vout1'
> +temp1_alarm RO Temeperature alarm
Nit: Temperature

> +temp1_input RO Chip temperature
> +=================== ===== =======================================================
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 750d3a975d82..31c51545df72 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -51,6 +51,7 @@ Hardware Monitoring Kernel Drivers
> da9052
> da9055
> dell-smm-hwmon
> + delta
> dme1737
> drivetemp
> ds1621
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index e35db489b76f..9b1863bfa946 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -44,6 +44,15 @@ config SENSORS_BEL_PFE
>
> This driver can also be built as a module. If so, the module will
> be called bel-pfe.
> +
> +config SENSORS_DELTA
> + tristate "Delta Power Supplies"
> + help
> + If you say yes here you get hardware monitoring support for Delta
> + Q54SJ108A2 series Power Supplies.
> +
> + This driver can also be built as a module. If so, the module will
> + be called delta.
>
> config SENSORS_IBM_CFFPS
> tristate "IBM Common Form Factor Power Supply"
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index c4b15db996ad..8957f5337002 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_PMBUS) += pmbus_core.o
> obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
> obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
> obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
> +obj-$(CONFIG_SENSORS_DELTA) += delta.o
> obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
> obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
> obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
> diff --git a/drivers/hwmon/pmbus/delta.c b/drivers/hwmon/pmbus/delta.c
> new file mode 100644
> index 000000000000..9fea3a3c460a
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/delta.c
> @@ -0,0 +1,136 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Driver for Delta modules, Q54SJ108A2 series 1/4 Brick DC/DC
> + * Regulated Power Module
> + *
> + * Copyright 2020 Delta LLC.
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>
> +#include <linux/pmbus.h>
> +#include <linux/util_macros.h>
> +#include "pmbus.h"
> +
> +enum chips {
> + Q54SJ108A2
> +};
> +
> +static const struct pmbus_driver_info delta_info[] = {
> + [Q54SJ108A2] = {
> + .pages = 1,
> +
> + /* Source : Delta Q54SJ108A2 */
> + .format[PSC_TEMPERATURE] = linear,
> + .format[PSC_VOLTAGE_IN] = linear,
> + .format[PSC_CURRENT_OUT] = linear,
> +
> + .func[0] = PMBUS_HAVE_VIN |
> + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
> + PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
> + PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
> + PMBUS_HAVE_STATUS_INPUT,
> + },
> +};
> +
> +
> +
> +static int delta_probe(struct i2c_client *client, const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
> + struct pmbus_driver_info *info;
> + enum chips chip_id;
> + int ret;
> +
> + if (!i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_BYTE_DATA |
> + I2C_FUNC_SMBUS_WORD_DATA |
> + I2C_FUNC_SMBUS_BLOCK_DATA))
> + return -ENODEV;
> +
> + if (client->dev.of_node)
> + chip_id = (enum chips)of_device_get_match_data(dev);
> + else
> + chip_id = id->driver_data;
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
> + if (ret < 0) {
> + dev_err(&client->dev, "Failed to read Manufacturer ID\n");
> + return ret;
> + }
> + if (ret != 5 || strncmp(buf, "DELTA", 5)) {
> + buf[ret] = '\0';
> + dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf);
> + return -ENODEV;
> + }
> +
> + /*
> + * The chips support reading PMBUS_MFR_MODEL.
> + */
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
> + if (ret < 0) {
> + dev_err(dev, "Failed to read Manufacturer Model\n");
> + return ret;
> + }
> + if (ret != 14 || strncmp(buf, "Q54SJ108A2", 10)) {
> + buf[ret] = '\0';
> + dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
> + return -ENODEV;
> + }
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf);
> + if (ret < 0) {
> + dev_err(dev, "Failed to read Manufacturer Revision\n");
> + return ret;
> + }
> + if (ret != 4 || buf[0] != 'S') {
> + buf[ret] = '\0';
> + dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf);
> + return -ENODEV;
> + }
> +
> + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + memcpy(info, &delta_info[chip_id], sizeof(*info));
> +
> + return pmbus_do_probe(client, id, info);
> +}
> +
> +static const struct i2c_device_id delta_id[] = {
> + { "Q54SJ108A2", Q54SJ108A2 },
> + { },
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, delta_id);
> +
> +static const struct of_device_id delta_of_match[] = {
> + { .compatible = "delta,Q54SJ108A2", .data = (void *)Q54SJ108A2 },
> + { },
> +};
> +
> +MODULE_DEVICE_TABLE(of, delta_of_match);
> +
> +static struct i2c_driver delta_driver = {
> + .driver = {
> + .name = "Q54SJ108A2",
> + .of_match_table = delta_of_match,
> + },
> + .probe = delta_probe,
> + .remove = pmbus_do_remove,
> + .id_table = delta_id,
> +};
> +
> +module_i2c_driver(delta_driver);
> +
> +MODULE_AUTHOR("Delta <xiao.mx.ma@deltaww.com>");
> +MODULE_DESCRIPTION("PMBus driver for Delta Q54SJ108A2 series modules");
> +MODULE_LICENSE("GPL");
>

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