Re: [PATCH v9 07/11] power: supply: max77650: add support for battery charger

From: Sebastian Reichel
Date: Wed Apr 17 2019 - 22:35:28 EST

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Hi,

On Thu, Apr 11, 2019 at 02:42:08PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>
> Add basic support for the battery charger for max77650 PMIC.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>

-- Sebastian

> drivers/power/supply/Kconfig | 7 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/max77650-charger.c | 368 ++++++++++++++++++++++++
> 3 files changed, 376 insertions(+)
> create mode 100644 drivers/power/supply/max77650-charger.c
>
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index e901b9879e7e..0230c96fa94d 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -499,6 +499,13 @@ config CHARGER_DETECTOR_MAX14656
> Revision 1.2 and can be found e.g. in Kindle 4/5th generation
> readers and certain LG devices.
>
> +config CHARGER_MAX77650
> + tristate "Maxim MAX77650 battery charger driver"
> + depends on MFD_MAX77650
> + help
> + Say Y to enable support for the battery charger control of MAX77650
> + PMICs.
> +
> config CHARGER_MAX77693
> tristate "Maxim MAX77693 battery charger driver"
> depends on MFD_MAX77693
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index b731c2a9b695..b73eb8c5c1a9 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -70,6 +70,7 @@ obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
> obj-$(CONFIG_CHARGER_LTC3651) += ltc3651-charger.o
> obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
> obj-$(CONFIG_CHARGER_DETECTOR_MAX14656) += max14656_charger_detector.o
> +obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o
> obj-$(CONFIG_CHARGER_MAX77693) += max77693_charger.o
> obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
> obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o
> diff --git a/drivers/power/supply/max77650-charger.c b/drivers/power/supply/max77650-charger.c
> new file mode 100644
> index 000000000000..e34714cb05ec
> --- /dev/null
> +++ b/drivers/power/supply/max77650-charger.c
> @@ -0,0 +1,368 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Copyright (C) 2018 BayLibre SAS
> +// Author: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> +//
> +// Battery charger driver for MAXIM 77650/77651 charger/power-supply.
> +
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/max77650.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/regmap.h>
> +
> +#define MAX77650_CHARGER_ENABLED BIT(0)
> +#define MAX77650_CHARGER_DISABLED 0x00
> +#define MAX77650_CHARGER_CHG_EN_MASK BIT(0)
> +
> +#define MAX77650_CHG_DETAILS_MASK GENMASK(7, 4)
> +#define MAX77650_CHG_DETAILS_BITS(_reg) \
> + (((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4)
> +
> +/* Charger is OFF. */
> +#define MAX77650_CHG_OFF 0x00
> +/* Charger is in prequalification mode. */
> +#define MAX77650_CHG_PREQ 0x01
> +/* Charger is in fast-charge constant current mode. */
> +#define MAX77650_CHG_ON_CURR 0x02
> +/* Charger is in JEITA modified fast-charge constant-current mode. */
> +#define MAX77650_CHG_ON_CURR_JEITA 0x03
> +/* Charger is in fast-charge constant-voltage mode. */
> +#define MAX77650_CHG_ON_VOLT 0x04
> +/* Charger is in JEITA modified fast-charge constant-voltage mode. */
> +#define MAX77650_CHG_ON_VOLT_JEITA 0x05
> +/* Charger is in top-off mode. */
> +#define MAX77650_CHG_ON_TOPOFF 0x06
> +/* Charger is in JEITA modified top-off mode. */
> +#define MAX77650_CHG_ON_TOPOFF_JEITA 0x07
> +/* Charger is done. */
> +#define MAX77650_CHG_DONE 0x08
> +/* Charger is JEITA modified done. */
> +#define MAX77650_CHG_DONE_JEITA 0x09
> +/* Charger is suspended due to a prequalification timer fault. */
> +#define MAX77650_CHG_SUSP_PREQ_TIM_FAULT 0x0a
> +/* Charger is suspended due to a fast-charge timer fault. */
> +#define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT 0x0b
> +/* Charger is suspended due to a battery temperature fault. */
> +#define MAX77650_CHG_SUSP_BATT_TEMP_FAULT 0x0c
> +
> +#define MAX77650_CHGIN_DETAILS_MASK GENMASK(3, 2)
> +#define MAX77650_CHGIN_DETAILS_BITS(_reg) \
> + (((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2)
> +
> +#define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT 0x00
> +#define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT 0x01
> +#define MAX77650_CHGIN_OKAY 0x11
> +
> +#define MAX77650_CHARGER_CHG_MASK BIT(1)
> +#define MAX77650_CHARGER_CHG_CHARGING(_reg) \
> + (((_reg) & MAX77650_CHARGER_CHG_MASK) > 1)
> +
> +#define MAX77650_CHARGER_VCHGIN_MIN_MASK 0xc0
> +#define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val) ((_val) << 5)
> +
> +#define MAX77650_CHARGER_ICHGIN_LIM_MASK 0x1c
> +#define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val) ((_val) << 2)
> +
> +struct max77650_charger_data {
> + struct regmap *map;
> + struct device *dev;
> +};
> +
> +static enum power_supply_property max77650_charger_properties[] = {
> + POWER_SUPPLY_PROP_STATUS,
> + POWER_SUPPLY_PROP_ONLINE,
> + POWER_SUPPLY_PROP_CHARGE_TYPE
> +};
> +
> +static const unsigned int max77650_charger_vchgin_min_table[] = {
> + 4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000
> +};
> +
> +static const unsigned int max77650_charger_ichgin_lim_table[] = {
> + 95000, 190000, 285000, 380000, 475000
> +};
> +
> +static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg,
> + unsigned int val)
> +{
> + int i, rv;
> +
> + for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) {
> + if (val == max77650_charger_vchgin_min_table[i]) {
> + rv = regmap_update_bits(chg->map,
> + MAX77650_REG_CNFG_CHG_B,
> + MAX77650_CHARGER_VCHGIN_MIN_MASK,
> + MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i));
> + if (rv)
> + return rv;
> +
> + return 0;
> + }
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg,
> + unsigned int val)
> +{
> + int i, rv;
> +
> + for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) {
> + if (val == max77650_charger_ichgin_lim_table[i]) {
> + rv = regmap_update_bits(chg->map,
> + MAX77650_REG_CNFG_CHG_B,
> + MAX77650_CHARGER_ICHGIN_LIM_MASK,
> + MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i));
> + if (rv)
> + return rv;
> +
> + return 0;
> + }
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int max77650_charger_enable(struct max77650_charger_data *chg)
> +{
> + int rv;
> +
> + rv = regmap_update_bits(chg->map,
> + MAX77650_REG_CNFG_CHG_B,
> + MAX77650_CHARGER_CHG_EN_MASK,
> + MAX77650_CHARGER_ENABLED);
> + if (rv)
> + dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
> +
> + return rv;
> +}
> +
> +static int max77650_charger_disable(struct max77650_charger_data *chg)
> +{
> + int rv;
> +
> + rv = regmap_update_bits(chg->map,
> + MAX77650_REG_CNFG_CHG_B,
> + MAX77650_CHARGER_CHG_EN_MASK,
> + MAX77650_CHARGER_DISABLED);
> + if (rv)
> + dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
> +
> + return rv;
> +}
> +
> +static irqreturn_t max77650_charger_check_status(int irq, void *data)
> +{
> + struct max77650_charger_data *chg = data;
> + int rv, reg;
> +
> + rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
> + if (rv) {
> + dev_err(chg->dev,
> + "unable to read the charger status: %d\n", rv);
> + return IRQ_HANDLED;
> + }
> +
> + switch (MAX77650_CHGIN_DETAILS_BITS(reg)) {
> + case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT:
> + dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n");
> + max77650_charger_disable(chg);
> + break;
> + case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT:
> + dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n");
> + max77650_charger_disable(chg);
> + break;
> + case MAX77650_CHGIN_OKAY:
> + max77650_charger_enable(chg);
> + break;
> + default:
> + /* May be 0x10 - debouncing */
> + break;
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int max77650_charger_get_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + union power_supply_propval *val)
> +{
> + struct max77650_charger_data *chg = power_supply_get_drvdata(psy);
> + int rv, reg;
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_STATUS:
> + rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
> + if (rv)
> + return rv;
> +
> + if (MAX77650_CHARGER_CHG_CHARGING(reg)) {
> + val->intval = POWER_SUPPLY_STATUS_CHARGING;
> + break;
> + }
> +
> + switch (MAX77650_CHG_DETAILS_BITS(reg)) {
> + case MAX77650_CHG_OFF:
> + case MAX77650_CHG_SUSP_PREQ_TIM_FAULT:
> + case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT:
> + case MAX77650_CHG_SUSP_BATT_TEMP_FAULT:
> + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
> + break;
> + case MAX77650_CHG_PREQ:
> + case MAX77650_CHG_ON_CURR:
> + case MAX77650_CHG_ON_CURR_JEITA:
> + case MAX77650_CHG_ON_VOLT:
> + case MAX77650_CHG_ON_VOLT_JEITA:
> + case MAX77650_CHG_ON_TOPOFF:
> + case MAX77650_CHG_ON_TOPOFF_JEITA:
> + val->intval = POWER_SUPPLY_STATUS_CHARGING;
> + break;
> + case MAX77650_CHG_DONE:
> + val->intval = POWER_SUPPLY_STATUS_FULL;
> + break;
> + default:
> + val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
> + }
> + break;
> + case POWER_SUPPLY_PROP_ONLINE:
> + rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
> + if (rv)
> + return rv;
> +
> + val->intval = MAX77650_CHARGER_CHG_CHARGING(reg);
> + break;
> + case POWER_SUPPLY_PROP_CHARGE_TYPE:
> + rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
> + if (rv)
> + return rv;
> +
> + if (!MAX77650_CHARGER_CHG_CHARGING(reg)) {
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
> + break;
> + }
> +
> + switch (MAX77650_CHG_DETAILS_BITS(reg)) {
> + case MAX77650_CHG_PREQ:
> + case MAX77650_CHG_ON_CURR:
> + case MAX77650_CHG_ON_CURR_JEITA:
> + case MAX77650_CHG_ON_VOLT:
> + case MAX77650_CHG_ON_VOLT_JEITA:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
> + break;
> + case MAX77650_CHG_ON_TOPOFF:
> + case MAX77650_CHG_ON_TOPOFF_JEITA:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
> + break;
> + default:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
> + }
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static const struct power_supply_desc max77650_battery_desc = {
> + .name = "max77650",
> + .type = POWER_SUPPLY_TYPE_USB,
> + .get_property = max77650_charger_get_property,
> + .properties = max77650_charger_properties,
> + .num_properties = ARRAY_SIZE(max77650_charger_properties),
> +};
> +
> +static int max77650_charger_probe(struct platform_device *pdev)
> +{
> + struct power_supply_config pscfg = {};
> + struct max77650_charger_data *chg;
> + struct power_supply *battery;
> + struct device *dev, *parent;
> + int rv, chg_irq, chgin_irq;
> + unsigned int prop;
> +
> + dev = &pdev->dev;
> + parent = dev->parent;
> +
> + chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
> + if (!chg)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, chg);
> +
> + chg->map = dev_get_regmap(parent, NULL);
> + if (!chg->map)
> + return -ENODEV;
> +
> + chg->dev = dev;
> +
> + pscfg.of_node = dev->of_node;
> + pscfg.drv_data = chg;
> +
> + chg_irq = platform_get_irq_byname(pdev, "CHG");
> + if (chg_irq < 0)
> + return chg_irq;
> +
> + chgin_irq = platform_get_irq_byname(pdev, "CHGIN");
> + if (chgin_irq < 0)
> + return chgin_irq;
> +
> + rv = devm_request_any_context_irq(dev, chg_irq,
> + max77650_charger_check_status,
> + IRQF_ONESHOT, "chg", chg);
> + if (rv < 0)
> + return rv;
> +
> + rv = devm_request_any_context_irq(dev, chgin_irq,
> + max77650_charger_check_status,
> + IRQF_ONESHOT, "chgin", chg);
> + if (rv < 0)
> + return rv;
> +
> + battery = devm_power_supply_register(dev,
> + &max77650_battery_desc, &pscfg);
> + if (IS_ERR(battery))
> + return PTR_ERR(battery);
> +
> + rv = of_property_read_u32(dev->of_node,
> + "input-voltage-min-microvolt", &prop);
> + if (rv == 0) {
> + rv = max77650_charger_set_vchgin_min(chg, prop);
> + if (rv)
> + return rv;
> + }
> +
> + rv = of_property_read_u32(dev->of_node,
> + "input-current-limit-microamp", &prop);
> + if (rv == 0) {
> + rv = max77650_charger_set_ichgin_lim(chg, prop);
> + if (rv)
> + return rv;
> + }
> +
> + return max77650_charger_enable(chg);
> +}
> +
> +static int max77650_charger_remove(struct platform_device *pdev)
> +{
> + struct max77650_charger_data *chg = platform_get_drvdata(pdev);
> +
> + return max77650_charger_disable(chg);
> +}
> +
> +static struct platform_driver max77650_charger_driver = {
> + .driver = {
> + .name = "max77650-charger",
> + },
> + .probe = max77650_charger_probe,
> + .remove = max77650_charger_remove,
> +};
> +module_platform_driver(max77650_charger_driver);
> +
> +MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
> +MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.21.0
>

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