Message-ID: <6eae4b51-ea07-0550-043f-b4bdc4feaa8c@roeck-us.net>
Date:   Mon, 5 Jul 2021 17:28:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Vincent Pelletier <plr.vincent@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Support Opensource <support.opensource@...semi.com>,
        Lee Jones <lee.jones@...aro.org>, linux-hwmon@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
Subject: Re: [PATCH 2/3] hwmon: da9063: HWMON driver

On 7/5/21 5:01 PM, Vincent Pelletier wrote:
> From: "Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
> 
> Add the HWMON driver for DA9063
> 
> Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@...semi.com>
> 
> Simplify and modernise the code a bit.
> Add minimal of_match_table.
> Fix logic inversion in detecting conversion end.
> Drop support for ADCIN: these are multi-purpose channels and must not
> be reconfigured unless explicitly authorised by the board description.
> 
> Signed-off-by: Vincent Pelletier <plr.vincent@...il.com>
> ---
> This patch depends on patch 1/3.
> Originally submitted by Steve Twiss in 2014:
>    https://marc.info/?l=linux-kernel&m=139560868309857&w=2
> 
>   drivers/hwmon/Kconfig                |  10 +
>   drivers/hwmon/Makefile               |   1 +
>   drivers/hwmon/da9063-hwmon.c         | 287 +++++++++++++++++++++++++++
>   include/linux/mfd/da9063/registers.h |  34 ++++
>   4 files changed, 332 insertions(+)
>   create mode 100644 drivers/hwmon/da9063-hwmon.c
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 87624902ea80..17244cfaa855 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -515,6 +515,16 @@ config SENSORS_DA9055
>   	  This driver can also be built as a module. If so, the module
>   	  will be called da9055-hwmon.
>   
> +config SENSORS_DA9063
> +	tristate "Dialog Semiconductor DA9063"
> +	depends on MFD_DA9063
> +	help
> +	  If you say yes here you get support for the hardware
> +	  monitoring features of the DA9063 Power Management IC.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called da9063-hwmon.
> +
>   config SENSORS_I5K_AMB
>   	tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
>   	depends on PCI
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 59e78bc212cf..6855711ed9ec 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -60,6 +60,7 @@ obj-$(CONFIG_SENSORS_CORSAIR_CPRO) += corsair-cpro.o
>   obj-$(CONFIG_SENSORS_CORSAIR_PSU) += corsair-psu.o
>   obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
>   obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o
> +obj-$(CONFIG_SENSORS_DA9063)	+= da9063-hwmon.o
>   obj-$(CONFIG_SENSORS_DELL_SMM)	+= dell-smm-hwmon.o
>   obj-$(CONFIG_SENSORS_DME1737)	+= dme1737.o
>   obj-$(CONFIG_SENSORS_DRIVETEMP)	+= drivetemp.o
> diff --git a/drivers/hwmon/da9063-hwmon.c b/drivers/hwmon/da9063-hwmon.c
> new file mode 100644
> index 000000000000..35b5bb0290ca
> --- /dev/null
> +++ b/drivers/hwmon/da9063-hwmon.c
> @@ -0,0 +1,287 @@
> +/* da9063-hwmon.c - Hardware monitor support for DA9063
> + * Copyright (C) 2014 Dialog Semiconductor Ltd.
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Library General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Library General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +#include <linux/platform_device.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/da9063/core.h>
> +#include <linux/mod_devicetable.h>
> +

Alphabetic include file order, please.

> +#define DA9063_ADC_RES	(1 << (DA9063_ADC_RES_L_BITS + DA9063_ADC_RES_M_BITS))
> +#define DA9063_ADC_MAX	(DA9063_ADC_RES - 1)
> +#define DA9063_2V5	2500
> +#define DA9063_5V0	5000
> +#define DA9063_5V5	5500
> +#define DA9063_TJUNC_M	-398
> +#define DA9063_TJUNC_O	330000
> +#define DA9063_VBBAT_M	2048
> +
> +enum da9063_adc {
> +	DA9063_CHAN_VSYS = DA9063_ADC_MUX_VSYS,
> +	DA9063_CHAN_ADCIN1 = DA9063_ADC_MUX_ADCIN1,
> +	DA9063_CHAN_ADCIN2 = DA9063_ADC_MUX_ADCIN2,
> +	DA9063_CHAN_ADCIN3 = DA9063_ADC_MUX_ADCIN3,
> +	DA9063_CHAN_TJUNC = DA9063_ADC_MUX_T_SENSE,
> +	DA9063_CHAN_VBBAT = DA9063_ADC_MUX_VBBAT,
> +	DA9063_CHAN_LDO_G1 = DA9063_ADC_MUX_LDO_G1,
> +	DA9063_CHAN_LDO_G2 = DA9063_ADC_MUX_LDO_G2,
> +	DA9063_CHAN_LDO_G3 = DA9063_ADC_MUX_LDO_G3
> +};
> +
> +struct da9063_hwmon {
> +	struct da9063 *da9063;
> +	struct mutex hwmon_mutex;
> +	struct completion adc_ready;
> +	signed char tjunc_offset;
> +};
> +
> +static int da9063_adc_convert(struct da9063_hwmon *hwmon, int channel,
> +			      int *value)
> +{
> +	int val = *value;
> +	int ret = 0;
> +
> +	switch (channel) {
> +	case DA9063_CHAN_VSYS:
> +		val = ((DA9063_5V5 - DA9063_2V5) * val) / DA9063_ADC_MAX +
> +			DA9063_2V5;
> +		break;
> +	case DA9063_CHAN_TJUNC:
> +		val -= hwmon->tjunc_offset;
> +		val = DA9063_TJUNC_M * val + DA9063_TJUNC_O;
> +		break;
> +	case DA9063_CHAN_VBBAT:
> +		val = (DA9063_5V0 * val) / DA9063_ADC_MAX;
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		goto err_convert;
> +	}
> +
> +	*value = val;
> +err_convert:
> +	return ret;
> +}
> +
> +
> +static int da9063_adc_manual_read(struct da9063_hwmon *hwmon, int channel)
> +{
> +	int ret;
> +	unsigned char val;
> +	unsigned char data[2];
> +	int adc_man;
> +
> +	mutex_lock(&hwmon->hwmon_mutex);
> +
> +	init_completion(&hwmon->adc_ready);
> +
> +	val = (channel & DA9063_ADC_MUX_MASK) | DA9063_ADC_MAN;
> +	ret = regmap_update_bits(hwmon->da9063->regmap, DA9063_REG_ADC_MAN,
> +				 DA9063_ADC_MUX_MASK | DA9063_ADC_MAN, val);
> +	if (ret < 0)
> +		goto err_mread;
> +
> +	ret = wait_for_completion_timeout(&hwmon->adc_ready,
> +					  msecs_to_jiffies(1000));
> +	if (ret == 0) {
> +		ret = -ETIMEDOUT;
> +		goto err_mread;
> +	}
> +
> +	ret = regmap_read(hwmon->da9063->regmap, DA9063_REG_ADC_MAN, &adc_man);
> +	if (ret < 0)
> +		goto err_mread;
> +
> +	/* data value is not ready */
> +	if (adc_man & DA9063_ADC_MAN) {
> +		ret = -EINVAL;
> +		goto err_mread;
> +	}
> +
> +	ret = regmap_bulk_read(hwmon->da9063->regmap,
> +			       DA9063_REG_ADC_RES_L, data, 2);
> +	if (ret < 0)
> +		goto err_mread;
> +
> +	ret = (data[0] & DA9063_ADC_RES_L_MASK) >> DA9063_ADC_RES_L_SHIFT;
> +	ret |= data[1] << DA9063_ADC_RES_L_BITS;
> +err_mread:
> +	mutex_unlock(&hwmon->hwmon_mutex);
> +	return ret;
> +}
> +
> +static irqreturn_t da9063_hwmon_irq_handler(int irq, void *irq_data)
> +{
> +	struct da9063_hwmon *hwmon = irq_data;
> +	complete(&hwmon->adc_ready);
> +	return IRQ_HANDLED;
> +}
> +
> +static ssize_t da9063_adc_show(struct device *dev,
> +			       struct device_attribute *devattr, char *buf)
> +{
> +	struct da9063_hwmon *hwmon = dev_get_drvdata(dev);
> +	int channel = to_sensor_dev_attr(devattr)->index;
> +	int val;
> +	int ret;
> +
> +	switch (channel) {
> +	case DA9063_CHAN_VSYS:
> +	case DA9063_CHAN_TJUNC:
> +	case DA9063_CHAN_VBBAT:
> +		/* fallthrough for internal measures */
> +		val = da9063_adc_manual_read(hwmon, channel);
> +		if (val < 0) {
> +			dev_err(dev, "ADC read error %d\n", val);
> +			return val;
> +		}
> +		break;
> +
> +	default:
> +		/* error case */
> +		ret = -EINVAL;
> +		goto err_read;

goto to return statement is unnecessary (and inconsistent).

> +	}
> +
> +	ret = da9063_adc_convert(hwmon, channel, &val);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to convert ADC value %d\n", ret);
> +		goto err_read;
> +	}
> +
> +	return sprintf(buf, "%d\n", val);
> +err_read:
> +	return ret;
> +}
> +
> +
> +static ssize_t da9063_label_show(struct device *dev,
> +				 struct device_attribute *devattr, char *buf)
> +{
> +	int channel = to_sensor_dev_attr(devattr)->index;
> +	char *label;
> +
> +	switch (channel) {
> +	case DA9063_CHAN_VSYS:
> +		label = "VSYS";
> +		break;
> +	case DA9063_CHAN_TJUNC:
> +		label = "TJUNC";
> +		break;
> +	case DA9063_CHAN_VBBAT:
> +		label = "VBBAT";
> +		break;
> +	default:
> +		label = "UNKNOWN";
> +	}
> +
> +	return sprintf(buf, "%s\n", label);
> +}
> +
> +static SENSOR_DEVICE_ATTR_RO(in0_input,
> +			  da9063_adc, DA9063_CHAN_VSYS);
> +static SENSOR_DEVICE_ATTR_RO(in0_label,
> +			  da9063_label, DA9063_CHAN_VSYS);
> +
> +static SENSOR_DEVICE_ATTR_RO(in4_input,
> +			  da9063_adc, DA9063_CHAN_VBBAT);
> +static SENSOR_DEVICE_ATTR_RO(in4_label,
> +			  da9063_label, DA9063_CHAN_VBBAT);
> +
> +static SENSOR_DEVICE_ATTR_RO(temp1_input,
> +			  da9063_adc, DA9063_CHAN_TJUNC);
> +static SENSOR_DEVICE_ATTR_RO(temp1_label,
> +			  da9063_label, DA9063_CHAN_TJUNC);
> +
> +static struct attribute *da9063_attrs[] = {
> +	&sensor_dev_attr_in0_input.dev_attr.attr,
> +	&sensor_dev_attr_in0_label.dev_attr.attr,
> +	&sensor_dev_attr_in4_input.dev_attr.attr,
> +	&sensor_dev_attr_in4_label.dev_attr.attr,
> +	&sensor_dev_attr_temp1_input.dev_attr.attr,
> +	&sensor_dev_attr_temp1_label.dev_attr.attr,
> +	NULL
> +};
> +
> +ATTRIBUTE_GROUPS(da9063);
> +
> +static int da9063_hwmon_probe(struct platform_device *pdev)
> +{
> +	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
> +	struct da9063_hwmon *hwmon;
> +	struct device *hwmon_dev;
> +	int irq;
> +	int ret;
> +
> +	hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9063_hwmon),
> +			     GFP_KERNEL);
> +	if (!hwmon)
> +		return -ENOMEM;
> +
> +	mutex_init(&hwmon->hwmon_mutex);
> +	init_completion(&hwmon->adc_ready);
> +	hwmon->da9063 = da9063;
> +
> +	irq = platform_get_irq_byname(pdev, DA9063_DRVNAME_HWMON);
> +	if (irq < 0)
> +		return irq;
> +
> +	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
> +					da9063_hwmon_irq_handler,
> +					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +					"HWMON", hwmon);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to request IRQ.\n");
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, hwmon);
> +
> +	/* set trim temperature offset to value read at startup */
> +	hwmon->tjunc_offset = (signed char)hwmon->da9063->t_offset;
> +
> +	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
> +							   "da9063",
> +							   hwmon, da9063_groups);

New hwmon drivers must use [devm_]hwmon_device_register_with_info()
to register the hwmon device.

> +
> +	return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct of_device_id da9063_dt_ids[] = {
> +	{ .compatible = DA9063_DRVNAME_HWMON, },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, da9063_dt_ids);
> +
> +static struct platform_driver da9063_hwmon_driver = {
> +	.probe = da9063_hwmon_probe,
> +	.driver = {
> +		.name = DA9063_DRVNAME_HWMON,
> +		.of_match_table = da9063_dt_ids,
> +	},
> +};
> +module_platform_driver(da9063_hwmon_driver);
> +
> +MODULE_DESCRIPTION("Hardware monitor support device driver for Dialog DA9063");
> +MODULE_AUTHOR("S Twiss <stwiss.opensource@...semi.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:" DA9063_DRVNAME_HWMON);
> diff --git a/include/linux/mfd/da9063/registers.h b/include/linux/mfd/da9063/registers.h

This isn't appropriate as part of the hwmon driver.

> index 6e0f66a2e727..297631ddda39 100644
> --- a/include/linux/mfd/da9063/registers.h
> +++ b/include/linux/mfd/da9063/registers.h
> @@ -512,6 +512,7 @@
>   
>   /* DA9063_REG_GPIO_0_1 (addr=0x15) */
>   #define	DA9063_GPIO0_PIN_MASK			0x03
> +#define	DA9063_GPIO0_PIN_MASK_SHIFT		0
>   #define		DA9063_GPIO0_PIN_ADCIN1		0x00
>   #define		DA9063_GPIO0_PIN_GPI		0x01
>   #define		DA9063_GPIO0_PIN_GPO_OD		0x02
> @@ -523,6 +524,7 @@
>   #define		DA9063_GPIO0_TYPE_GPO_VDD_IO2	0x04
>   #define	DA9063_GPIO0_NO_WAKEUP			0x08
>   #define	DA9063_GPIO1_PIN_MASK			0x30
> +#define	DA9063_GPIO1_PIN_MASK_SHIFT		4
>   #define		DA9063_GPIO1_PIN_ADCIN2_COMP	0x00
>   #define		DA9063_GPIO1_PIN_GPI		0x10
>   #define		DA9063_GPIO1_PIN_GPO_OD		0x20
> @@ -536,6 +538,7 @@
>   
>   /* DA9063_REG_GPIO_2_3 (addr=0x16) */
>   #define	DA9063_GPIO2_PIN_MASK			0x03
> +#define	DA9063_GPIO2_PIN_MASK_SHIFT		0
>   #define		DA9063_GPIO2_PIN_ADCIN3		0x00
>   #define		DA9063_GPIO2_PIN_GPI		0x01
>   #define		DA9063_GPIO2_PIN_GPO_PSS	0x02
> @@ -851,6 +854,7 @@
>   #define	DA9063_VSYS_VAL_BASE			0x00
>   
>   /* DA9063_REG_ADC_RES_L (addr=0x37) */
> +#define	DA9063_ADC_RES_L_SHIFT			6
>   #define	DA9063_ADC_RES_L_BITS			2
>   #define	DA9063_ADC_RES_L_MASK			0xC0
>   
> @@ -1014,6 +1018,36 @@
>   #define DA9063_GPIO_DIM				0x80
>   #define DA9063_GPIO_PWM_MASK			0x7F
>   
> +/* DA9063_REG_ADC_CFG (addr=0xC9) */
> +#define DA9063_REG_ADCIN1_CUR_MASK		0x03
> +#define DA9063_REG_ADCIN1_CUR_SHIFT		0
> +#define		DA9063_ADCIN1_CUR_1UA		0x00
> +#define		DA9063_ADCIN1_CUR_2UA		0x01
> +#define		DA9063_ADCIN1_CUR_10UA		0x02
> +#define		DA9063_ADCIN1_CUR_40UA		0x03
> +#define DA9063_REG_ADCIN2_CUR_MASK		0x0C
> +#define DA9063_REG_ADCIN2_CUR_SHIFT		2
> +#define		DA9063_ADCIN2_CUR_1UA		0x00
> +#define		DA9063_ADCIN2_CUR_2UA		0x01
> +#define		DA9063_ADCIN2_CUR_10UA		0x02
> +#define		DA9063_ADCIN2_CUR_40UA		0x03
> +#define DA9063_REG_ADCIN3_CUR_MASK		0x10
> +#define DA9063_REG_ADCIN3_CUR_SHIFT		4
> +#define		DA9063_ADCIN3_CUR_10UA		0x00
> +#define		DA9063_ADCIN3_CUR_40UA		0x01
> +#define DA9063_REG_ADCIN1_DEB_MASK		0x20
> +#define DA9063_REG_ADCIN1_DEB_SHIFT		5
> +#define		DA9063_ADCIN1_DEB_OFF		0x00
> +#define		DA9063_ADCIN1_DEB_ON		0x01
> +#define DA9063_REG_ADCIN2_DEB_MASK		0x40
> +#define DA9063_REG_ADCIN2_DEB_SHIFT		6
> +#define		DA9063_ADCIN2_DEB_OFF		0x00
> +#define		DA9063_ADCIN2_DEB_ON		0x01
> +#define DA9063_REG_ADCIN3_DEB_MASK		0x80
> +#define DA9063_REG_ADCIN3_DEB_SHIFT		7
> +#define		DA9063_ADCIN3_DEB_OFF		0x00
> +#define		DA9063_ADCIN3_DEB_ON		0x01
> +
>   /* DA9063_REG_CONFIG_H (addr=0x10D) */
>   #define DA9063_PWM_CLK_MASK			0x01
>   #define		DA9063_PWM_CLK_PWM2MHZ		0x00
> 

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