[PATCH v3 1/2] power: act8945a: add charger driver for ACT8945A
Krzysztof Kozlowski
k.kozlowski at samsung.com
Tue Jan 12 20:09:46 PST 2016
On 13.01.2016 12:53, Yang, Wenyou wrote:
> Hi Krzysztof,
>
> Thank you!
>
>> -----Original Message-----
>> From: Krzysztof Kozlowski [mailto:k.kozlowski at samsung.com]
>> Sent: 2016年1月13日 10:12
>> To: Yang, Wenyou <Wenyou.Yang at atmel.com>; 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>
>> Cc: Javier Martinez Canillas <javier at dowhile0.org>; Lee Jones
>> <lee.jones at linaro.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 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 at atmel.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 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 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.
>
> I checked, it seems they are not mixed in the patch. Or I am wrong?
I mean that use "unsigned int value = 0;" here. You're going cast it
anyway to unsigned int when calling regmap functions.
>
>>
>> [...]
>>
>> Javier pointed the auto-loading issue before (because you are not providing any
>> device table). Probably that is not what you want.
>
> Yes, but I still don't understand for now ...
Try building this as module and check whether it got automatically
loaded during boot. :)
Best regards,
Krzysztof
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