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Message-ID: <0b42721e-2cef-a943-e4da-dd2f2a2a97f2@roeck-us.net>
Date: Fri, 4 Jan 2019 06:41:32 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Xiaoting Liu <xiaoting.liu@...-semitech.com>, jdelvare@...e.com
Cc: openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, shunyong.yang@...-semitech.com,
dongsheng.wang@...-semitech.com
Subject: Re: [PATCH 4/4] pmbus (dps650ab): add power supply driver
On 1/4/19 1:05 AM, Xiaoting Liu wrote:
> The Delta dps650ab provides main power and standby power to server.
> dps650ab can be detected by MFR_ID and MFR_MODEL referring to
> manufacturer's feedback. This patch adds driver to moniter power
> supply status.
>
> Signed-off-by: Xiaoting Liu <xiaoting.liu@...-semitech.com>
> ---
> drivers/hwmon/pmbus/Kconfig | 10 +++++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/dps650ab.c | 100 +++++++++++++++++++++++++++++++++++++++++
> drivers/hwmon/pmbus/pmbus.c | 3 ++
> 4 files changed, 114 insertions(+)
>
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 629cb45f8557..de4638396592 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -184,4 +184,14 @@ config SENSORS_ZL6100
> This driver can also be built as a module. If so, the module will
> be called zl6100.
>
> +config SENSORS_DPS650AB
> + tristate "Delta DPS650AB"
> + default n
> + help
> + If you say yes here you get hardware monitoring support for the
> + Delta DPS650AB controller.
> +
> + This driver can also be built as a module. If so, the module will
> + be called dps650ab.
> +
> endif # PMBUS
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index ea0e39518c21..414818230a26 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -21,3 +21,4 @@ obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
> obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
> obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
> obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
> +obj-$(CONFIG_SENSORS_DPS650AB) += dps650ab.o
> diff --git a/drivers/hwmon/pmbus/dps650ab.c b/drivers/hwmon/pmbus/dps650ab.c
> new file mode 100644
> index 000000000000..3c300e621f5a
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/dps650ab.c
> @@ -0,0 +1,100 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Hardware monitoring driver for DELTA DPS650AB
> + *
> + * Copyright (c) 2018 Huaxintong Semiconductor Technology Co., Ltd.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include "pmbus.h"
> +
> +#define DPS650AB_MFR_ID "DELTA"
> +#define DPS650AB_MFR_MODEL "DPS-650AB-16 A"
> +
> +static int dps650ab_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct pmbus_driver_info *info;
> + u8 buf[I2C_SMBUS_BLOCK_MAX];
> + int ret;
> +
> + memset(buf, 0, I2C_SMBUS_BLOCK_MAX);
> +
I don't think this is needed.
> + if (!i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_READ_BYTE_DATA
> + | I2C_FUNC_SMBUS_READ_WORD_DATA
> + | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
> + return -ENODEV;
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
> + if (ret < 0) {
> + dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
> + return ret;
> + }
> +
> + if (strncmp(buf, DPS650AB_MFR_ID, strlen(DPS650AB_MFR_ID))) {
It might make sense to verify the length of the returned string as well,
unless strings such as "DELTAX" are accepted on purpose. But even if
that is the case I would prefer an added check of "ret < strlen(DPS650AB_MFR_ID)"
over the memset() above....
> + dev_err(&client->dev, "DPS650AB_MFR_ID unrecognised\n");
> + return -ENODEV;
> + }
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
> + if (ret < 0) {
> + dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
> + return ret;
> + }
> +
> + if (strncmp(buf, DPS650AB_MFR_MODEL, strlen(DPS650AB_MFR_MODEL))) {
... to ensure that nothing bad slips through here. As currently written, the code
accepts a MFR_ID of "DELTA50AB-16 A" combined with a MFR_MODEL "DPS-6" as valid.
> + dev_err(&client->dev, "DPS650AB_MFR_MODEL unrecognised\n");
It would be a nice touch to actually list the unrecognized model. Otherwise
the message is quite useless. Same for MFR_ID.
> + return -ENODEV;
> + }
> +
> + info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->pages = 1;
> + info->format[PSC_VOLTAGE_IN] = linear;
> + info->format[PSC_VOLTAGE_OUT] = linear;
> + info->format[PSC_CURRENT_IN] = linear;
> + info->format[PSC_CURRENT_OUT] = linear;
> + info->format[PSC_POWER] = linear;
> + info->format[PSC_TEMPERATURE] = linear;
> +
> + info->func[0] = PMBUS_HAVE_VIN
> + | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
> + | PMBUS_HAVE_STATUS_INPUT
> + | PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12
> + | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
> + | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
> + | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
> + | PMBUS_HAVE_STATUS_TEMP;
> + info->func[1] = info->func[0];
> +
> + return pmbus_do_probe(client, id, info);
> +}
> +
> +static const struct i2c_device_id dps650ab_id[] = {
> + {"dps650ab", 1},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, dps650ab_id);
> +
> +static struct i2c_driver dps650ab_driver = {
> + .driver = {
> + .name = "dps650ab",
> + },
> + .probe = dps650ab_probe,
> + .remove = pmbus_do_remove,
> + .id_table = dps650ab_id,
> +};
> +
> +module_i2c_driver(dps650ab_driver);
> +
> +MODULE_AUTHOR("Liuxiaoting <xiaoting.liu@...-semitech.com");
> +MODULE_DESCRIPTION("PMBus driver for DPS650AB");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c
> index aa4cf9636e99..930e8a3e2366 100644
> --- a/drivers/hwmon/pmbus/pmbus.c
> +++ b/drivers/hwmon/pmbus/pmbus.c
> @@ -204,6 +204,8 @@ static int pmbus_probe(struct i2c_client *client,
> static const struct pmbus_device_info sgd009_pmbus_info = {
> 1, PMBUS_SKIP_STATUS_CHECK};
> static const struct pmbus_device_info pmbus_info = {0, 0};
> +static const struct pmbus_device_info dps650ab_pmbus_info = {
> + 1, PMBUS_SKIP_STATUS_CHECK};
Something is conceptually wrong here. Either this change or a new driver,
but not both.
> /*
> * Use driver_data to set the number of pages supported by the chip.
> */
> @@ -227,6 +229,7 @@ static int pmbus_probe(struct i2c_client *client,
> {"tps544c20", (kernel_ulong_t)&default_pmbus_info},
> {"tps544c25", (kernel_ulong_t)&default_pmbus_info},
> {"udt020", (kernel_ulong_t)&default_pmbus_info},
> + {"dps650ab", (kernel_ulong_t)&dps650ab_pmbus_info},
Also, FWIW, this should be kept in alphabetic order.
> {}
> };
>
> --
> 1.8.3.1
>
>
>
>
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