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SubjectRe: [PATCH v2 2/2] power: supply: Add Spreadtrum SC2731 charger support
Hi Sebastian,

On 16 September 2018 at 18:17, Sebastian Reichel
<sebastian.reichel@collabora.com> wrote:
> Hi Baolin,
>
> On Mon, Sep 03, 2018 at 04:55:46PM +0800, Baolin Wang wrote:
>> This patch adds the SC2731 PMIC switch charger support.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
>> ---
>
> The power-supply sysfs files uses uA instead of mA, otherwise the
> driver and the binding looks fine to me.

OK. Thanks for your reviewing.

>
> -- Sebastian
>
>> Changes from v1:
>> - Remove some redundant head files.
>> - Add one mutex to make sure getting the charger status is correct.
>> - Fix some coding style issues.
>> - Use standard DT properties.
>> ---
>> drivers/power/supply/Kconfig | 7 +
>> drivers/power/supply/Makefile | 1 +
>> drivers/power/supply/sc2731_charger.c | 503 +++++++++++++++++++++++++++++++++
>> 3 files changed, 511 insertions(+)
>> create mode 100644 drivers/power/supply/sc2731_charger.c
>>
>> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
>> index ff6dab0..f27cf07 100644
>> --- a/drivers/power/supply/Kconfig
>> +++ b/drivers/power/supply/Kconfig
>> @@ -645,4 +645,11 @@ config CHARGER_CROS_USBPD
>> what is connected to USB PD ports from the EC and converts
>> that into power_supply properties.
>>
>> +config CHARGER_SC2731
>> + tristate "Spreadtrum SC2731 charger driver"
>> + depends on MFD_SC27XX_PMIC || COMPILE_TEST
>> + help
>> + Say Y here to enable support for battery charging with SC2731
>> + PMIC chips.
>> +
>> endif # POWER_SUPPLY
>> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
>> index a26b402..767105b 100644
>> --- a/drivers/power/supply/Makefile
>> +++ b/drivers/power/supply/Makefile
>> @@ -85,3 +85,4 @@ obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o
>> obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
>> obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
>> obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o
>> +obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o
>> diff --git a/drivers/power/supply/sc2731_charger.c b/drivers/power/supply/sc2731_charger.c
>> new file mode 100644
>> index 0000000..c92e5fc
>> --- /dev/null
>> +++ b/drivers/power/supply/sc2731_charger.c
>> @@ -0,0 +1,503 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// Copyright (C) 2018 Spreadtrum Communications Inc.
>> +
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/power_supply.h>
>> +#include <linux/usb/phy.h>
>> +#include <linux/regmap.h>
>> +#include <linux/notifier.h>
>> +#include <linux/of.h>
>> +
>> +/* PMIC global registers definition */
>> +#define SC2731_CHARGE_STATUS 0xedc
>> +#define SC2731_CHARGE_FULL BIT(4)
>> +#define SC2731_MODULE_EN1 0xc0c
>> +#define SC2731_CHARGE_EN BIT(5)
>> +
>> +/* SC2731 switch charger registers definition */
>> +#define SC2731_CHG_CFG0 0x0
>> +#define SC2731_CHG_CFG1 0x4
>> +#define SC2731_CHG_CFG2 0x8
>> +#define SC2731_CHG_CFG3 0xc
>> +#define SC2731_CHG_CFG4 0x10
>> +#define SC2731_CHG_CFG5 0x28
>> +
>> +/* SC2731_CHG_CFG0 register definition */
>> +#define SC2731_PRECHG_RNG_SHIFT 11
>> +#define SC2731_PRECHG_RNG_MASK GENMASK(12, 11)
>> +
>> +#define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1)
>> +#define SC2731_TERMINATION_VOL_SHIFT 1
>> +#define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3)
>> +#define SC2731_TERMINATION_VOL_CAL_SHIFT 3
>> +#define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0)
>> +
>> +#define SC2731_CC_EN BIT(13)
>> +#define SC2731_CHARGER_PD BIT(0)
>> +
>> +/* SC2731_CHG_CFG1 register definition */
>> +#define SC2731_CUR_MASK GENMASK(5, 0)
>> +
>> +/* SC2731_CHG_CFG5 register definition */
>> +#define SC2731_CUR_LIMIT_SHIFT 8
>> +#define SC2731_CUR_LIMIT_MASK GENMASK(9, 8)
>> +
>> +/* Default current definition (unit is mA) */
>> +#define SC2731_CURRENT_LIMIT_100 100
>> +#define SC2731_CURRENT_LIMIT_500 500
>> +#define SC2731_CURRENT_LIMIT_900 900
>> +#define SC2731_CURRENT_LIMIT_2000 2000
>> +#define SC2731_CURRENT_PRECHG 450
>> +#define SC2731_CURRENT_STEP 50
>> +
>> +struct sc2731_charger_info {
>> + struct device *dev;
>> + struct regmap *regmap;
>> + struct usb_phy *usb_phy;
>> + struct notifier_block usb_notify;
>> + struct power_supply *psy_usb;
>> + struct mutex lock;
>> + bool charging;
>> + u32 base;
>> +};
>> +
>> +static void sc2731_charger_stop_charge(struct sc2731_charger_info *info)
>> +{
>> + regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
>> + SC2731_CC_EN, 0);
>> +
>> + regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
>> + SC2731_CHARGER_PD, SC2731_CHARGER_PD);
>> +}
>> +
>> +static int sc2731_charger_start_charge(struct sc2731_charger_info *info)
>> +{
>> + int ret;
>> +
>> + /* Enable charger constant current mode */
>> + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
>> + SC2731_CC_EN, SC2731_CC_EN);
>> + if (ret)
>> + return ret;
>> +
>> + /* Start charging */
>> + return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
>> + SC2731_CHARGER_PD, 0);
>> +}
>> +
>> +static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info,
>> + u32 limit)
>> +{
>> + u32 val;
>> +
>> + if (limit <= SC2731_CURRENT_LIMIT_100)
>> + val = 0;
>> + else if (limit <= SC2731_CURRENT_LIMIT_500)
>> + val = 3;
>> + else if (limit <= SC2731_CURRENT_LIMIT_900)
>> + val = 2;
>> + else
>> + val = 1;
>> +
>> + return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5,
>> + SC2731_CUR_LIMIT_MASK,
>> + val << SC2731_CUR_LIMIT_SHIFT);
>> +}
>> +
>> +static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur)
>> +{
>> + u32 val;
>> + int ret;
>> +
>> + if (cur > SC2731_CURRENT_LIMIT_2000)
>> + cur = SC2731_CURRENT_LIMIT_2000;
>> + else if (cur < SC2731_CURRENT_PRECHG)
>> + cur = SC2731_CURRENT_PRECHG;
>> +
>> + /* Calculate the step value, each step is 50 mA */
>> + val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP;
>> +
>> + /* Set pre-charge current as 450 mA */
>> + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
>> + SC2731_PRECHG_RNG_MASK,
>> + 0x3 << SC2731_PRECHG_RNG_SHIFT);
>> + if (ret)
>> + return ret;
>> +
>> + return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1,
>> + SC2731_CUR_MASK, val);
>> +}
>> +
>> +static int sc2731_charger_get_status(struct sc2731_charger_info *info)
>> +{
>> + u32 val;
>> + int ret;
>> +
>> + ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val);
>> + if (ret)
>> + return ret;
>> +
>> + if (val & SC2731_CHARGE_FULL)
>> + return POWER_SUPPLY_STATUS_FULL;
>> +
>> + return POWER_SUPPLY_STATUS_CHARGING;
>> +}
>> +
>> +static int sc2731_charger_get_current(struct sc2731_charger_info *info,
>> + u32 *cur)
>> +{
>> + int ret;
>> + u32 val;
>> +
>> + ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val);
>> + if (ret)
>> + return ret;
>> +
>> + val &= SC2731_CUR_MASK;
>> + *cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG;
>> +
>> + return 0;
>> +}
>> +
>> +static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info,
>> + u32 *cur)
>> +{
>> + int ret;
>> + u32 val;
>> +
>> + ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val);
>> + if (ret)
>> + return ret;
>> +
>> + val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT;
>> +
>> + switch (val) {
>> + case 0:
>> + *cur = SC2731_CURRENT_LIMIT_100;
>> + break;
>> +
>> + case 1:
>> + *cur = SC2731_CURRENT_LIMIT_2000;
>> + break;
>> +
>> + case 2:
>> + *cur = SC2731_CURRENT_LIMIT_900;
>> + break;
>> +
>> + case 3:
>> + *cur = SC2731_CURRENT_LIMIT_500;
>> + break;
>> +
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int
>> +sc2731_charger_usb_set_property(struct power_supply *psy,
>> + enum power_supply_property psp,
>> + const union power_supply_propval *val)
>> +{
>> + struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
>> + int ret;
>> +
>> + mutex_lock(&info->lock);
>> +
>> + if (!info->charging) {
>> + mutex_unlock(&info->lock);
>> + return -ENODEV;
>> + }
>> +
>> + switch (psp) {
>> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
>> + ret = sc2731_charger_set_current(info, val->intval);
>> + if (ret < 0)
>> + dev_err(info->dev, "set charge current failed\n");
>> + break;
>
> This gets uA as input (instead of mA).

Yes. Sorry I missed this and will fix in next version.

>
>> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
>> + ret = sc2731_charger_set_current_limit(info, val->intval);
>> + if (ret < 0)
>> + dev_err(info->dev, "set input current limit failed\n");
>> + break;
>
> This gets uA as input (instead of mA).

OK.

>
>> +
>> + default:
>> + ret = -EINVAL;
>> + }
>> +
>> + mutex_unlock(&info->lock);
>> + return ret;
>> +}
>> +
>> +static int sc2731_charger_usb_get_property(struct power_supply *psy,
>> + enum power_supply_property psp,
>> + union power_supply_propval *val)
>> +{
>> + struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
>> + int ret = 0;
>> + u32 cur;
>> +
>> + mutex_lock(&info->lock);
>> +
>> + switch (psp) {
>> + case POWER_SUPPLY_PROP_STATUS:
>> + if (info->charging)
>> + val->intval = sc2731_charger_get_status(info);
>> + else
>> + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
>> + break;
>> +
>> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
>> + if (!info->charging) {
>> + val->intval = 0;
>> + } else {
>> + ret = sc2731_charger_get_current(info, &cur);
>> + if (ret)
>> + goto out;
>> +
>> + val->intval = cur;
>> + }
>> + break;
>
> This should always report uA (instead of mA).

OK.

>
>> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
>> + if (!info->charging) {
>> + val->intval = 0;
>> + } else {
>> + ret = sc2731_charger_get_current_limit(info, &cur);
>> + if (ret)
>> + goto out;
>> +
>> + val->intval = cur;
>> + }
>> + break;
>
> This should always report uA (instead of mA).

OK. Thanks.

>
>> + default:
>> + ret = -EINVAL;
>> + }
>> +
>> +out:
>> + mutex_unlock(&info->lock);
>> + return ret;
>> +}
>> +
>> +static int sc2731_charger_property_is_writeable(struct power_supply *psy,
>> + enum power_supply_property psp)
>> +{
>> + int ret;
>> +
>> + switch (psp) {
>> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
>> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
>> + ret = 1;
>> + break;
>> +
>> + default:
>> + ret = 0;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static enum power_supply_property sc2731_usb_props[] = {
>> + POWER_SUPPLY_PROP_STATUS,
>> + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
>> + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
>> +};
>> +
>> +static const struct power_supply_desc sc2731_charger_desc = {
>> + .name = "sc2731_charger",
>> + .type = POWER_SUPPLY_TYPE_USB,
>> + .properties = sc2731_usb_props,
>> + .num_properties = ARRAY_SIZE(sc2731_usb_props),
>> + .get_property = sc2731_charger_usb_get_property,
>> + .set_property = sc2731_charger_usb_set_property,
>> + .property_is_writeable = sc2731_charger_property_is_writeable,
>> +};
>> +
>> +static int sc2731_charger_usb_change(struct notifier_block *nb,
>> + unsigned long limit, void *data)
>> +{
>> + struct sc2731_charger_info *info =
>> + container_of(nb, struct sc2731_charger_info, usb_notify);
>> + int ret = 0;
>> +
>> + mutex_lock(&info->lock);
>> +
>> + if (limit > 0) {
>> + /* set current limitation and start to charge */
>> + ret = sc2731_charger_set_current_limit(info, limit);
>> + if (ret)
>> + goto out;
>> +
>> + ret = sc2731_charger_set_current(info, limit);
>> + if (ret)
>> + goto out;
>> +
>> + ret = sc2731_charger_start_charge(info);
>> + if (ret)
>> + goto out;
>> +
>> + info->charging = true;
>> + } else {
>> + /* Stop charging */
>> + info->charging = false;
>> + sc2731_charger_stop_charge(info);
>> + }
>> +
>> +out:
>> + mutex_unlock(&info->lock);
>> + return ret;
>> +}
>> +
>> +static int sc2731_charger_hw_init(struct sc2731_charger_info *info)
>> +{
>> + struct power_supply_battery_info bat_info = { };
>> + u32 term_currrent, term_voltage, cur_val, vol_val;
>> + int ret;
>> +
>> + /* Enable charger module */
>> + ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1,
>> + SC2731_CHARGE_EN, SC2731_CHARGE_EN);
>> + if (ret)
>> + return ret;
>> +
>> + ret = power_supply_get_battery_info(info->psy_usb, &bat_info);
>> + if (ret) {
>> + dev_warn(info->dev, "no battery information is supplied\n");
>> +
>> + /*
>> + * If no battery information is supplied, we should set
>> + * default charge termination current to 120 mA, and default
>> + * charge termination voltage to 4.35V.
>> + */
>> + cur_val = 0x2;
>> + vol_val = 0x1;
>> + } else {
>> + term_currrent = bat_info.charge_term_current_ua / 1000;
>> +
>> + if (term_currrent <= 90)
>> + cur_val = 0;
>> + else if (term_currrent >= 265)
>> + cur_val = 0x7;
>> + else
>> + cur_val = ((term_currrent - 90) / 25) + 1;
>> +
>> + term_voltage = bat_info.constant_charge_voltage_max_uv / 1000;
>> +
>> + if (term_voltage > 4500)
>> + term_voltage = 4500;
>> +
>> + if (term_voltage > 4200)
>> + vol_val = (term_voltage - 4200) / 100;
>> + else
>> + vol_val = 0;
>> + }
>> +
>> + /* Set charge termination current */
>> + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2,
>> + SC2731_TERMINATION_CUR_MASK, cur_val);
>> + if (ret)
>> + goto error;
>> +
>> + /* Set charge termination voltage */
>> + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
>> + SC2731_TERMINATION_VOL_MASK |
>> + SC2731_TERMINATION_VOL_CAL_MASK,
>> + (vol_val << SC2731_TERMINATION_VOL_SHIFT) |
>> + (0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT));
>> + if (ret)
>> + goto error;
>> +
>> + return 0;
>> +
>> +error:
>> + regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0);
>> + return ret;
>> +}
>> +
>> +static int sc2731_charger_probe(struct platform_device *pdev)
>> +{
>> + struct device_node *np = pdev->dev.of_node;
>> + struct sc2731_charger_info *info;
>> + struct power_supply_config charger_cfg = { };
>> + int ret;
>> +
>> + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
>> + if (!info)
>> + return -ENOMEM;
>> +
>> + mutex_init(&info->lock);
>> + info->dev = &pdev->dev;
>> +
>> + info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
>> + if (!info->regmap) {
>> + dev_err(&pdev->dev, "failed to get charger regmap\n");
>> + return -ENODEV;
>> + }
>> +
>> + ret = of_property_read_u32(np, "reg", &info->base);
>> + if (ret) {
>> + dev_err(&pdev->dev, "failed to get register address\n");
>> + return -ENODEV;
>> + }
>> +
>> + charger_cfg.drv_data = info;
>> + charger_cfg.of_node = np;
>> + info->psy_usb = devm_power_supply_register(&pdev->dev,
>> + &sc2731_charger_desc,
>> + &charger_cfg);
>> + if (IS_ERR(info->psy_usb)) {
>> + dev_err(&pdev->dev, "failed to register power supply\n");
>> + return PTR_ERR(info->psy_usb);
>> + }
>> +
>> + ret = sc2731_charger_hw_init(info);
>> + if (ret)
>> + return ret;
>> +
>> + info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
>> + if (IS_ERR(info->usb_phy)) {
>> + dev_err(&pdev->dev, "failed to find USB phy\n");
>> + return PTR_ERR(info->usb_phy);
>> + }
>> +
>> + info->usb_notify.notifier_call = sc2731_charger_usb_change;
>> + ret = usb_register_notifier(info->usb_phy, &info->usb_notify);
>> + if (ret) {
>> + dev_err(&pdev->dev, "failed to register notifier: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int sc2731_charger_remove(struct platform_device *pdev)
>> +{
>> + struct sc2731_charger_info *info = platform_get_drvdata(pdev);
>> +
>> + usb_unregister_notifier(info->usb_phy, &info->usb_notify);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id sc2731_charger_of_match[] = {
>> + { .compatible = "sprd,sc2731-charger", },
>> + { }
>> +};
>> +
>> +static struct platform_driver sc2731_charger_driver = {
>> + .driver = {
>> + .name = "sc2731-charger",
>> + .of_match_table = sc2731_charger_of_match,
>> + },
>> + .probe = sc2731_charger_probe,
>> + .remove = sc2731_charger_remove,
>> +};
>> +
>> +module_platform_driver(sc2731_charger_driver);
>> +
>> +MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 1.7.9.5
>>



--
Baolin Wang
Best Regards

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