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Message-ID: <aef5ffb9-a670-cff4-80a5-e41881b38327@roeck-us.net>
Date: Wed, 19 May 2021 16:46:46 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Erik Rosen <erik.rosen@...ormote.com>,
Jean Delvare <jdelvare@...e.com>,
Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] hwmon: (pmbus/pim4328) Add PMBus driver for PIM4006,
PIM4328 and PIM4820
On 5/19/21 1:10 PM, Erik Rosen wrote:
> Add hardware monitoring support for Flex power interface modules PIM4006,
> PIM4328 and PIM4820.
>
> Signed-off-by: Erik Rosen <erik.rosen@...ormote.com>
> ---
> drivers/hwmon/pmbus/Kconfig | 9 +
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/pim4328.c | 310 ++++++++++++++++++++++++++++++++++
> 3 files changed, 320 insertions(+)
> create mode 100644 drivers/hwmon/pmbus/pim4328.c
>
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 37a5c39784fa..001527c71269 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -257,6 +257,15 @@ config SENSORS_MP2975
> This driver can also be built as a module. If so, the module will
> be called mp2975.
>
> +config SENSORS_PIM4328
> + tristate "Flex PIM4328 and compatibles"
> + help
> + If you say yes here you get hardware monitoring support for Flex
> + PIM4328, PIM4820 and PIM4006 Power Interface Modules.
> +
> + This driver can also be built as a module. If so, the module will
> + be called pim4328.
> +
> config SENSORS_PM6764TR
> tristate "ST PM6764TR"
> help
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index f8dcc27cd56a..2a12397535ba 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -39,3 +39,4 @@ obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
> obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
> obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o
> obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
> +obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o
> diff --git a/drivers/hwmon/pmbus/pim4328.c b/drivers/hwmon/pmbus/pim4328.c
> new file mode 100644
> index 000000000000..b9aa4f76f6cd
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/pim4328.c
> @@ -0,0 +1,310 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Hardware monitoring driver for PIM4006, PIM4328 and PIM4820
> + *
> + * Copyright (c) 2021 Flextronics International Sweden AB
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/pmbus.h>
> +#include "pmbus.h"
> +
> +enum chips { pim4006, pim4328, pim4820 };
> +
> +struct pim4328_data {
> + enum chips id;
> + struct pmbus_driver_info info;
> +};
> +
> +#define to_pim4328_data(x) container_of(x, struct pim4328_data, info)
> +
> +/* PIM4006 and PIM4328 */
> +#define PIM4328_MFR_READ_VINA 0xd3
> +#define PIM4328_MFR_READ_VINB 0xd4
> +
> +/* PIM4006 */
> +#define PIM4328_MFR_READ_IINA 0xd6
> +#define PIM4328_MFR_READ_IINB 0xd7
> +#define PIM4328_MFR_FET_CHECKSTATUS 0xd9
> +
> +/* PIM4328 */
> +#define PIM4328_MFR_STATUS_BITS 0xd5
> +
> +/* PIM4820 */
> +#define PIM4328_MFR_READ_STATUS 0xd0
> +
> +static const struct i2c_device_id pim4328_id[] = {
> + {"bmr455", pim4328},
> + {"pim4006", pim4006},
> + {"pim4106", pim4006},
> + {"pim4206", pim4006},
> + {"pim4306", pim4006},
> + {"pim4328", pim4328},
> + {"pim4406", pim4006},
> + {"pim4820", pim4820},
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, pim4328_id);
> +
> +static int pim4328_read_word_data(struct i2c_client *client, int page,
> + int phase, int reg)
> +{
> + const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
> + struct pim4328_data *data = to_pim4328_data(info);
> + int ret, status;
> +
> + if (page > 0)
> + return -ENXIO;
> +
> + switch (reg) {
> + case PMBUS_STATUS_WORD:
> + ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
> + if (ret >= 0) {
> + if (data->id == pim4006) {
> + status = pmbus_read_word_data(client, page, 0xff,
> + PIM4328_MFR_FET_CHECKSTATUS);
> + if (status > 0) {
> + if (status & 0x0630) /* Input UV */
> + ret |= 0x08;
> + }
> + } else if (data->id == pim4328) {
> + status = pmbus_read_byte_data(client, page,
> + PIM4328_MFR_STATUS_BITS);
> + if (status > 0) {
> + if (status & 0x04) /* Input UV */
> + ret |= 0x08;
> + if (status & 0x40) /* Output UV */
> + ret |= 0x80;
> + }
> + } else if (data->id == pim4820) {
> + status = pmbus_read_byte_data(client, page,
> + PIM4328_MFR_READ_STATUS);
> + if (status > 0) {
> + if (status & 0x05) /* Input OV or OC */
> + ret |= 0x2001;
> + if (status & 0x1a) /* Input UV */
> + ret |= 0x2008;
> + if (status & 0x40) /* OT */
> + ret |= 0x0004;
> + }
> + }
> + }
> + break;
> + case PMBUS_READ_VIN:
> + if (phase != 0xff) {
> + ret = pmbus_read_word_data(client, page, phase,
> + phase == 0 ? PIM4328_MFR_READ_VINA
> + : PIM4328_MFR_READ_VINB);
> + } else {
> + ret = -ENODATA;
> + }
> + break;
> + case PMBUS_READ_IIN:
> + if (phase != 0xff) {
> + ret = pmbus_read_word_data(client, page, phase,
> + phase == 0 ? PIM4328_MFR_READ_IINA
> + : PIM4328_MFR_READ_IINB);
> + } else {
> + ret = -ENODATA;
> + }
> + break;
> + default:
> + ret = -ENODATA;
> + }
> +
> + return ret;
> +}
> +
> +static int pim4328_read_byte_data(struct i2c_client *client, int page, int reg)
> +{
> + int ret;
> +
> + if (page > 0)
> + return -ENXIO;
> +
> + switch (reg) {
> + case PMBUS_STATUS_BYTE:
> + ret = pim4328_read_word_data(client, page, 0xff, PMBUS_STATUS_WORD);
> + if (ret > 0)
> + ret &= 0xff;
> + break;
> + default:
> + ret = -ENODATA;
> + }
> +
> + return ret;
> +}
> +
> +static int pim4328_probe(struct i2c_client *client)
> +{
> + int status;
> + u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
> + const struct i2c_device_id *mid;
> + struct pim4328_data *data;
> + struct pmbus_driver_info *info;
> + struct pmbus_platform_data *pdata;
> + struct device *dev = &client->dev;
> +
> + if (!i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_READ_BYTE_DATA
> + | I2C_FUNC_SMBUS_BLOCK_DATA))
> + return -ENODEV;
> +
> + data = devm_kzalloc(&client->dev, sizeof(struct pim4328_data),
> + GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + status = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, device_id);
> + if (status < 0) {
> + dev_err(&client->dev, "Failed to read Manufacturer Model\n");
> + return status;
> + }
> + for (mid = pim4328_id; mid->name[0]; mid++) {
> + if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
> + break;
> + }
> + if (!mid->name[0]) {
> + dev_err(&client->dev, "Unsupported device\n");
> + return -ENODEV;
> + }
> +
> + if (strcmp(client->name, mid->name) != 0)
> + dev_notice(&client->dev,
> + "Device mismatch: Configured %s, detected %s\n",
> + client->name, mid->name);
> +
> + data->id = mid->driver_data;
> +
> + if (data->id == pim4328 || data->id == pim4820)
> + if (!i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_BLOCK_PROC_CALL))
> + return -ENODEV;
> +
> + info = &data->info;
> + info->pages = 1;
> + info->read_byte_data = pim4328_read_byte_data;
> + info->read_word_data = pim4328_read_word_data;
> +
> + switch (data->id) {
> + case pim4006:
> + info->phases[0] = 2;
> + info->func[0] = PMBUS_PHASE_VIRTUAL | PMBUS_HAVE_VIN
> + | PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
> + info->pfunc[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
> + info->pfunc[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN;
> + break;
> + case pim4328:
> + info->phases[0] = 2;
> + info->func[0] = PMBUS_PHASE_VIRTUAL
> + | PMBUS_HAVE_VCAP | PMBUS_HAVE_VIN
> + | PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT;
> + info->pfunc[0] = PMBUS_HAVE_VIN;
> + info->pfunc[1] = PMBUS_HAVE_VIN;
> + info->format[PSC_VOLTAGE_IN] = direct;
> + info->format[PSC_VOLTAGE_OUT] = direct;
> + info->format[PSC_TEMPERATURE] = direct;
> + info->format[PSC_CURRENT_OUT] = direct;
> + break;
> + case pim4820:
> + info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_TEMP
> + | PMBUS_HAVE_IIN;
> + info->format[PSC_VOLTAGE_IN] = direct;
> + info->format[PSC_TEMPERATURE] = direct;
> + info->format[PSC_CURRENT_IN] = direct;
> + break;
> + default:
> + return -ENODEV;
> + }
> +
> + if (info->func[0] & PMBUS_HAVE_VCAP &&
> + info->format[PSC_VOLTAGE_OUT] == direct) {
> + status = pmbus_read_coefficients(client, info,
> + PSC_VOLTAGE_OUT,
> + PMBUS_READ_VCAP,
> + true);
> + if (status < 0) {
> + dev_err(&client->dev,
> + "Failed to read coefficients for PMBUS_READ_VCAP\n");
> + return status;
> + }
> + }
Is there reason to implement this all here, or could we simply add another flag
such as PMBUS_HAS_COEFFICIENTS_CMD and have the core read the coefficients as
needed ?
I'd rather have this implemented in the core instead of having to carry
similar code in all drivers supporting the coefficients command.
Thanks,
Guenter
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