[PATCH v2 1/2] power: act8945a: add charger driver for ACT8945A

Yang, Wenyou Wenyou.Yang at atmel.com
Mon Jan 11 23:49:10 PST 2016


Hi Krzysztof,

> -----Original Message-----
> From: k.kozlowski.k at gmail.com [mailto:k.kozlowski.k at gmail.com] On Behalf Of
> Krzysztof Kozlowski
> Sent: 2016年1月8日 20:17
> To: Yang, Wenyou <Wenyou.Yang at atmel.com>
> Cc: Sebastian Reichel <sre at kernel.org>; Dmitry Eremin-Solenikov
> <dbaryshkov at gmail.com>; David Woodhouse <dwmw2 at infradead.org>; Rob
> Herring <robh+dt at kernel.org>; Pawel Moll <pawel.moll at arm.com>; Mark
> Rutland <mark.rutland at arm.com>; Ian Campbell <ijc+devicetree at hellion.org.uk>;
> Kumar Gala <galak at codeaurora.org>; Ferre, Nicolas
> <Nicolas.FERRE at atmel.com>; linux-arm-kernel at lists.infradead.org; linux-
> kernel at vger.kernel.org; linux-pm at vger.kernel.org
> Subject: Re: [PATCH v2 1/2] power: act8945a: add charger driver for ACT8945A
> 
> 2016-01-08 17:46 GMT+09:00 Wenyou Yang <wenyou.yang at atmel.com>:
> > 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 at atmel.com>
> > ---
> >
> > 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 |  386
> > ++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 394 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..fe9c19f
> > --- /dev/null
> > +++ b/drivers/power/act8945a_charger.c
> > @@ -0,0 +1,386 @@
> > +/*
> > + * Power supply driver for the Active-semi ACT8945A PMIC
> > + *
> > + * Copyright (C) 2015 Atmel Corporation
> > + *                   Wenyou Yang <wenyou.yang at atmel.com>
> > + *
> > + * 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_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;
> > +
> > +       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 = devm_power_supply_register(&pdev->dev,
> > +                                            &act8945a_charger_desc,
> > +                                            &psy_cfg);
> > +       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);
> >
> 
> The point of devm-like functions is to get rid of error and removal paths. This
> won't work... actually this should oops. Have you tested unbinding of driver?

Sorry about it.

I forgot do this test for v2.

I will remove it in the next verion.

> 
> Best regards,
> Krzysztof


Best Regards,
Wenyou Yang


More information about the linux-arm-kernel mailing list