Message-id: <5695B252.4060606@samsung.com>
Date:	Wed, 13 Jan 2016 11:11:30 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Wenyou Yang <wenyou.yang@...el.com>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Cc:	Javier Martinez Canillas <javier@...hile0.org>,
	Lee Jones <lee.jones@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 1/2] power: act8945a: add charger driver for ACT8945A

On 12.01.2016 17:09, Wenyou Yang wrote:
> This patch adds new driver for Active-semi ACT8945A ActivePath
> charger (part of ACT8945A MFD driver) providing power supply class
> information to userspace.
> 
> The driver is configured through DTS (battery and system related
> settings) and sysfs entries (timers and input over-voltage threshold).
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> ---
> 
> Changes in v3:
>  - update the file header with short version license and author line.
>  - remove unused member of struct act8945a_charger, dev.
>  - action due to removing the member of stuct act8945a_dev, dev.
>  - remove the unnecessary print out.
>  - remove the unnecessary act8945a_charger_remove().
>  - fix align of the code-style.
> 
> Changes in v2:
>  1./ Substitute of_property_read_bool() for of_get_property().
>  2./ Substitute devm_power_supply_register() for power_supply_register().
>  3./ Use module_platform_driver(), instead of subsys_initcall().
>  4./ Substitute MODULE_LICENSE("GPL") for MODULE_LICENSE("GPL v2").
> 
>  drivers/power/Kconfig            |    7 +
>  drivers/power/Makefile           |    1 +
>  drivers/power/act8945a_charger.c |  367 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 375 insertions(+)
>  create mode 100644 drivers/power/act8945a_charger.c
> 
> diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
> index 1ddd13c..ae75211 100644
> --- a/drivers/power/Kconfig
> +++ b/drivers/power/Kconfig
> @@ -75,6 +75,13 @@ config BATTERY_88PM860X
>  	help
>  	  Say Y here to enable battery monitor for Marvell 88PM860x chip.
>  
> +config BATTERY_ACT8945A
> +	tristate "Active-semi ACT8945A charger driver"
> +	depends on MFD_ACT8945A
> +	help
> +	  Say Y here to enable support for power supply provided by
> +	  Active-semi ActivePath ACT8945A charger.
> +
>  config BATTERY_DS2760
>  	tristate "DS2760 battery driver (HP iPAQ & others)"
>  	depends on W1 && W1_SLAVE_DS2760
> diff --git a/drivers/power/Makefile b/drivers/power/Makefile
> index 0e4eab5..e46b75d 100644
> --- a/drivers/power/Makefile
> +++ b/drivers/power/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_WM8350_POWER)	+= wm8350_power.o
>  obj-$(CONFIG_TEST_POWER)	+= test_power.o
>  
>  obj-$(CONFIG_BATTERY_88PM860X)	+= 88pm860x_battery.o
> +obj-$(CONFIG_BATTERY_ACT8945A)	+= act8945a_charger.o
>  obj-$(CONFIG_BATTERY_DS2760)	+= ds2760_battery.o
>  obj-$(CONFIG_BATTERY_DS2780)	+= ds2780_battery.o
>  obj-$(CONFIG_BATTERY_DS2781)	+= ds2781_battery.o
> diff --git a/drivers/power/act8945a_charger.c b/drivers/power/act8945a_charger.c
> new file mode 100644
> index 0000000..643a2ed
> --- /dev/null
> +++ b/drivers/power/act8945a_charger.c
> @@ -0,0 +1,367 @@
> +/*
> + * Power supply driver for the Active-semi ACT8945A PMIC
> + *
> + * Copyright (C) 2015 Atmel Corporation
> + *
> + * Author: Wenyou Yang <wenyou.yang@...el.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +#include <linux/module.h>
> +#include <linux/mfd/act8945a.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/regmap.h>
> +
> +static const char *act8945a_charger_model = "ACT8945A";
> +static const char *act8945a_charger_manufacturer = "Active-semi";
> +
> +/**
> + * ACT8945A Charger Register Map
> + */
> +
> +/* 0x70: Reserved */
> +#define ACT8945A_APCH_CFG		0x71
> +#define ACT8945A_APCH_STATUS		0x78
> +#define ACT8945A_APCH_CTRL		0x79
> +#define ACT8945A_APCH_STATE		0x7A
> +
> +/* ACT8945A_APCH_CFG */
> +#define APCH_CFG_OVPSET		(0x03 << 0)
> +#define		APCH_CFG_OVPSET_6V6	(0x0 << 0)
> +#define		APCH_CFG_OVPSET_7V	(0x1 << 0)
> +#define		APCH_CFG_OVPSET_7V5	(0x2 << 0)
> +#define		APCH_CFG_OVPSET_8V	(0x3 << 0)

Why the tabs after #define? Nooooo...

> +#define APCH_CFG_PRETIMO	(0x03 << 2)
> +#define		APCH_CFG_PRETIMO_40_MIN		(0x0 << 2)
> +#define		APCH_CFG_PRETIMO_60_MIN		(0x1 << 2)
> +#define		APCH_CFG_PRETIMO_80_MIN		(0x2 << 2)
> +#define		APCH_CFG_PRETIMO_DISABLED	(0x3 << 2)
> +#define APCH_CFG_TOTTIMO	(0x03 << 4)
> +#define		APCH_CFG_TOTTIMO_3_HOUR		(0x0 << 4)
> +#define		APCH_CFG_TOTTIMO_4_HOUR		(0x1 << 4)
> +#define		APCH_CFG_TOTTIMO_5_HOUR		(0x2 << 4)
> +#define		APCH_CFG_TOTTIMO_DISABLED	(0x3 << 4)
> +#define APCH_CFG_SUSCHG		(0x01 << 7)
> +
> +#define APCH_STATUS_CHGDAT	(0x01 << 0)
> +#define APCH_STATUS_INDAT	(0x01 << 1)
> +#define APCH_STATUS_TEMPDAT	(0x01 << 2)
> +#define APCH_STATUS_TIMRDAT	(0x01 << 3)
> +#define APCH_STATUS_CHGSTAT	(0x01 << 4)
> +#define APCH_STATUS_INSTAT	(0x01 << 5)
> +#define APCH_STATUS_TEMPSTAT	(0x01 << 6)
> +#define APCH_STATUS_TIMRSTAT	(0x01 << 7)
> +
> +#define APCH_CTRL_CHGEOCOUT	(0x01 << 0)
> +#define APCH_CTRL_INDIS		(0x01 << 1)
> +#define APCH_CTRL_TEMPOUT	(0x01 << 2)
> +#define APCH_CTRL_TIMRPRE	(0x01 << 3)
> +#define APCH_CTRL_CHGEOCIN	(0x01 << 4)
> +#define APCH_CTRL_INCON		(0x01 << 5)
> +#define APCH_CTRL_TEMPIN	(0x01 << 6)
> +#define APCH_CTRL_TIMRTOT	(0x01 << 7)

For the STATUS and CTRL use BIT(n) macro.


> +
> +#define APCH_STATE_ACINSTAT	(0x01 << 1)
> +#define APCH_STATE_CSTATE	(0x03 << 4)
> +#define APCH_STATE_CSTATE_SHIFT		4
> +#define		APCH_STATE_CSTATE_DISABLED	0x00
> +#define		APCH_STATE_CSTATE_EOC		0x01
> +#define		APCH_STATE_CSTATE_FAST		0x02
> +#define		APCH_STATE_CSTATE_PRE		0x03
> +
> +struct act8945a_charger {
> +	struct act8945a_dev *act8945a_dev;
> +	struct power_supply *psy;
> +
> +	u32 tolal_time_out;
> +	u32 pre_time_out;
> +	u32 input_voltage_threshold;
> +	bool battery_temperature;
> +	int chglev_pin;
> +	int chglev_value;
> +};
> +
> +static int act8945a_get_charger_state(struct regmap *regmap, int *val)
> +{
> +	int ret;
> +	unsigned int status, state;
> +
> +	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
> +	if (ret < 0)
> +		return ret;
> +
> +	state &= APCH_STATE_CSTATE;
> +	state >>= APCH_STATE_CSTATE_SHIFT;
> +
> +	if (state == APCH_STATE_CSTATE_EOC) {
> +		if (status & APCH_STATUS_CHGDAT)
> +			*val = POWER_SUPPLY_STATUS_FULL;
> +		else
> +			*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
> +	} else if ((state == APCH_STATE_CSTATE_FAST) ||
> +		   (state == APCH_STATE_CSTATE_PRE)) {
> +		*val = POWER_SUPPLY_STATUS_CHARGING;
> +	} else {
> +		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
> +	}
> +
> +	return 0;
> +}
> +
> +static int act8945a_get_charge_type(struct regmap *regmap, int *val)
> +{
> +	int ret;
> +	unsigned int state;
> +
> +	ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
> +	if (ret < 0)
> +		return ret;
> +
> +	state &= APCH_STATE_CSTATE;
> +	state >>= APCH_STATE_CSTATE_SHIFT;
> +
> +	switch (state) {
> +	case APCH_STATE_CSTATE_PRE:
> +		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
> +		break;
> +	case APCH_STATE_CSTATE_FAST:
> +		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
> +		break;
> +	case APCH_STATE_CSTATE_EOC:
> +	case APCH_STATE_CSTATE_DISABLED:
> +	default:
> +		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
> +	}
> +
> +	return 0;
> +}
> +
> +static int act8945a_get_battery_health(struct act8945a_charger *charger,
> +				       struct regmap *regmap, int *val)
> +{
> +	int ret;
> +	unsigned int status;
> +
> +	ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT))
> +		*val = POWER_SUPPLY_HEALTH_OVERHEAT;
> +	else if (!(status & APCH_STATUS_INDAT))
> +		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
> +	else if (status & APCH_STATUS_TIMRDAT)
> +		*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
> +	else
> +		*val = POWER_SUPPLY_HEALTH_GOOD;
> +
> +	return 0;
> +}
> +
> +static enum power_supply_property act8945a_charger_props[] = {
> +	POWER_SUPPLY_PROP_STATUS,
> +	POWER_SUPPLY_PROP_CHARGE_TYPE,
> +	POWER_SUPPLY_PROP_TECHNOLOGY,
> +	POWER_SUPPLY_PROP_HEALTH,
> +	POWER_SUPPLY_PROP_MODEL_NAME,
> +	POWER_SUPPLY_PROP_MANUFACTURER
> +};
> +
> +static int act8945a_charger_get_property(struct power_supply *psy,
> +					 enum power_supply_property prop,
> +					 union power_supply_propval *val)
> +{
> +	struct act8945a_charger *charger = power_supply_get_drvdata(psy);
> +	struct regmap *regmap = charger->act8945a_dev->regmap;
> +	int ret = 0;
> +
> +	switch (prop) {
> +	case POWER_SUPPLY_PROP_STATUS:
> +		ret = act8945a_get_charger_state(regmap, &val->intval);
> +		break;
> +	case POWER_SUPPLY_PROP_CHARGE_TYPE:
> +		ret = act8945a_get_charge_type(regmap, &val->intval);
> +		break;
> +	case POWER_SUPPLY_PROP_TECHNOLOGY:
> +		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
> +		break;
> +	case POWER_SUPPLY_PROP_HEALTH:
> +		ret = act8945a_get_battery_health(charger,
> +						  regmap, &val->intval);
> +		break;
> +	case POWER_SUPPLY_PROP_MODEL_NAME:
> +		val->strval = act8945a_charger_model;
> +		break;
> +	case POWER_SUPPLY_PROP_MANUFACTURER:
> +		val->strval = act8945a_charger_manufacturer;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct power_supply_desc act8945a_charger_desc = {
> +	.name		= "act8945a-charger",
> +	.type		= POWER_SUPPLY_TYPE_BATTERY,
> +	.get_property	= act8945a_charger_get_property,
> +	.properties	= act8945a_charger_props,
> +	.num_properties	= ARRAY_SIZE(act8945a_charger_props),
> +};
> +
> +#define DEFAULT_TOTAL_TIME_OUT		3
> +#define DEFAULT_PRE_TIME_OUT		40
> +#define DEFAULT_INPUT_OVP_THRESHOLD	6600
> +
> +static int act8945a_charger_parse_dt(struct device *dev,
> +				     struct act8945a_charger *charger)
> +{
> +	struct device_node *np = dev->of_node;
> +	enum of_gpio_flags flags;
> +
> +	if (!np) {
> +		dev_err(dev, "no charger of node\n");
> +		return -EINVAL;
> +	}
> +
> +	charger->chglev_pin = of_get_named_gpio_flags(np,
> +				"active-semi,chglev-gpio", 0, &flags);
> +
> +	charger->chglev_value = (flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1;
> +
> +	charger->battery_temperature = of_property_read_bool(np,
> +					"active-semi,battery_temperature");
> +
> +	if (of_property_read_u32(np, "active-semi,input_voltage_threshold",
> +				 &charger->input_voltage_threshold))
> +		charger->input_voltage_threshold = DEFAULT_PRE_TIME_OUT;
> +
> +	if (of_property_read_u32(np, "active-semi,precondition_timeout",
> +				 &charger->pre_time_out))
> +		charger->pre_time_out = DEFAULT_PRE_TIME_OUT;
> +
> +	if (of_property_read_u32(np, "active-semi,total_timeout",
> +				 &charger->tolal_time_out))
> +		charger->tolal_time_out = DEFAULT_TOTAL_TIME_OUT;
> +
> +	return 0;
> +}
> +
> +static int act8945a_charger_config(struct act8945a_charger *charger)
> +{
> +	struct regmap *regmap = charger->act8945a_dev->regmap;
> +	u8 value = 0;

Regmap uses "unsigned int". I think it is better not to mix it so use in
the driver "unsigned int" for interactions with regmap.

[...]

Javier pointed the auto-loading issue before (because you are not
providing any device table). Probably that is not what you want.

Best regards,
Krzysztof

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