RE: [PATCH 1/2] power: act8945a: add charger driver for ACT8945A

From: Yang, Wenyou
Date: Fri Jan 08 2016 - 01:44:15 EST

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Hello Krzysztof,

Thank you for your commends.

They will be fixed in the next version.

> -----Original Message-----
> From: k.kozlowski.k@xxxxxxxxx [mailto:k.kozlowski.k@xxxxxxxxx] On Behalf Of
> Krzysztof Kozlowski
> Sent: 2016å1æ8æ 11:55
> To: Yang, Wenyou <Wenyou.Yang@xxxxxxxxx>
> Cc: Sebastian Reichel <sre@xxxxxxxxxx>; Dmitry Eremin-Solenikov
> <dbaryshkov@xxxxxxxxx>; David Woodhouse <dwmw2@xxxxxxxxxxxxx>; Rob
> Herring <robh+dt@xxxxxxxxxx>; Pawel Moll <pawel.moll@xxxxxxx>; Mark
> Rutland <mark.rutland@xxxxxxx>; Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>;
> Kumar Gala <galak@xxxxxxxxxxxxxx>; Ferre, Nicolas
> <Nicolas.FERRE@xxxxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; linux-pm@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 1/2] power: act8945a: add charger driver for ACT8945A
>
> 2016-01-08 11:13 GMT+09:00 Wenyou Yang <wenyou.yang@xxxxxxxxx>:
> > 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@xxxxxxxxx>
> > ---
> >
> > drivers/power/Kconfig | 7 +
> > drivers/power/Makefile | 1 +
> > drivers/power/act8945a_charger.c | 397
> > ++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 405 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..5b55cd7
> > --- /dev/null
> > +++ b/drivers/power/act8945a_charger.c
> > @@ -0,0 +1,397 @@
> > +/*
> > + * Power supply driver for the Active-semi ACT8945A PMIC
> > + *
> > + * Copyright (C) 2015 Atmel Corporation
> > + * Wenyou Yang <wenyou.yang@xxxxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > +modify
> > + * it under the terms of the GNU General Public License as published
> > +by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program 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 General Public License for more details.
> > + */
> > +
> > +#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)
> > +#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)
> > +
> > +#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 device *dev;
> > + 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_get_property(np,
> > + "active-semi,battery_temperature",
> > + NULL);
>
> Just: of_property_read_bool()?
>
> > +
> > + 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;
> > +
> > + if (gpio_is_valid(charger->chglev_pin))
> > + gpio_set_value(charger->chglev_pin,
> > + charger->chglev_value);
> > +
> > + switch (charger->input_voltage_threshold) {
> > + case 8000:
> > + value |= APCH_CFG_OVPSET_8V;
> > + break;
> > + case 7500:
> > + value |= APCH_CFG_OVPSET_7V5;
> > + break;
> > + case 7000:
> > + value |= APCH_CFG_OVPSET_7V;
> > + break;
> > + case 6600:
> > + default:
> > + value |= APCH_CFG_OVPSET_6V6;
> > + break;
> > + }
> > +
> > + switch (charger->pre_time_out) {
> > + case 60:
> > + value |= APCH_CFG_PRETIMO_60_MIN;
> > + break;
> > + case 80:
> > + value |= APCH_CFG_PRETIMO_80_MIN;
> > + break;
> > + case 0:
> > + value |= APCH_CFG_PRETIMO_DISABLED;
> > + break;
> > + case 40:
> > + default:
> > + value |= APCH_CFG_PRETIMO_40_MIN;
> > + break;
> > + }
> > +
> > + switch (charger->tolal_time_out) {
> > + case 4:
> > + value |= APCH_CFG_TOTTIMO_4_HOUR;
> > + break;
> > + case 5:
> > + value |= APCH_CFG_TOTTIMO_5_HOUR;
> > + break;
> > + case 0:
> > + value |= APCH_CFG_TOTTIMO_DISABLED;
> > + break;
> > + case 3:
> > + default:
> > + value |= APCH_CFG_TOTTIMO_3_HOUR;
> > + break;
> > + }
> > +
> > + return regmap_write(regmap, ACT8945A_APCH_CFG, value); }
> > +
> > +static int act8945a_charger_probe(struct platform_device *pdev) {
> > + struct act8945a_dev *act8945a_dev = dev_get_drvdata(pdev->dev.parent);
> > + struct act8945a_charger *charger;
> > + struct power_supply_config psy_cfg = {};
> > + int ret;
> > +
> > + charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
> > + if (!charger)
> > + return -ENOMEM;
> > +
> > + platform_set_drvdata(pdev, charger);
> > +
> > + charger->dev = &pdev->dev;
> > + charger->act8945a_dev = act8945a_dev;
> > +
> > + ret = act8945a_charger_parse_dt(&pdev->dev, charger);
> > + if (ret)
> > + return ret;
> > +
> > + ret = act8945a_charger_config(charger);
> > + if (ret)
> > + return ret;
> > +
> > + psy_cfg.of_node = pdev->dev.of_node;
> > + psy_cfg.drv_data = charger;
> > +
> > + charger->psy = power_supply_register(&pdev->dev,
> > + &act8945a_charger_desc,
> > + &psy_cfg);
>
> You can use devm-like() API for this and get rid of remove function...
> but it is not a necessity I think. Up to you.
>
> > + if (IS_ERR(charger->psy)) {
> > + dev_err(act8945a_dev->dev, "failed to register power supply\n");
> > + return PTR_ERR(charger->psy);
> > + }
> > +
> > + dev_info(act8945a_dev->dev, "charger driver registered\n");
> > +
> > + return 0;
> > +}
> > +
> > +static int act8945a_charger_remove(struct platform_device *pdev) {
> > + struct act8945a_charger *charger = platform_get_drvdata(pdev);
> > +
> > + power_supply_unregister(charger->psy);
> > +
> > + return 0;
> > +}
> > +
> > +static struct platform_driver act8945a_charger_driver = {
> > + .driver = {
> > + .name = "act8945a-charger",
> > + },
> > + .probe = act8945a_charger_probe,
> > + .remove = act8945a_charger_remove, };
> > +
> > +static int __init act8945a_charger_init(void) {
> > + return platform_driver_register(&act8945a_charger_driver);
> > +}
> > +subsys_initcall(act8945a_charger_init);
>
> Why subsys_initcall? This should be regular module_platform_driver.

I want it to register early enough as MFD. Maybe I am wrong.

>
> > +
> > +static void __exit act8945a_charger_cleanup(void) {
> > + platform_driver_unregister(&act8945a_charger_driver);
> > +}
> > +module_exit(act8945a_charger_cleanup);
> > +
> > +MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
> > +MODULE_AUTHOR("Wenyou Yang <wenyou.yang@xxxxxxxxx>");
> > +MODULE_LICENSE("GPL v2");
>
> In the comment at beginning you mentioned GPL v2+ so this should be "GPL".
>
> Best regards,
> Krzysztof

Best Regards,
Wenyou Yang

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