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Date: Wed, 29 Aug 2018 16:36:22 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: baolin.wang@...aro.org
Cc: sre@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, yuanjiang.yu@...soc.com,
broonie@...nel.org
Subject: Re: [PATCH 2/2] power: supply: Add Spreadtrum SC2731 charger support
I'll try one more time... but without HTML from Gmail. Previous mail
bounced from lists.
On Tue, 28 Aug 2018 at 11:04, Baolin Wang <baolin.wang@...aro.org> wrote:
>
> This patch adds the SC2731 PMIC switch charger support.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> drivers/power/supply/Kconfig | 7 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/sc2731_charger.c | 451 +++++++++++++++++++++++++++++++++
> 3 files changed, 459 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..49ae16a
> --- /dev/null
> +++ b/drivers/power/supply/sc2731_charger.c
> @@ -0,0 +1,451 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2018 Spreadtrum Communications Inc.
> +
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/slab.h>
slab.h includes looks not needed.
> +#include <linux/usb/phy.h>
> +#include <linux/regmap.h>
> +#include <linux/extcon.h>
Looks not used.
> +#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)
> +
> +#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
What units are used for all these currents?
> +
> +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;
> + 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;
> +
> + /* Calculte the step value, each step is 50 mA */
s/Calculte/Calculate/
> + 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;
One empty line please.
> + 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;
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
> + ret = sc2731_charger_set_current(info, val->intval);
> + if (ret < 0)
> + dev_warn(info->dev, "set charge current failed\n");
> + break;
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + ret = sc2731_charger_set_current_limit(info, val->intval);
> + if (ret < 0)
> + dev_warn(info->dev, "set input current limit failed\n");
> + break;
> + default:
> + ret = -EINVAL;
> + }
> +
> + 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);
> + u32 cur;
> + int ret;
> +
> + 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;
> + break;
> + }
> +
> + ret = sc2731_charger_get_current(info, &cur);
> + if (ret)
> + return ret;
> +
> + val->intval = cur;
> + break;
> +
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + if (!info->charging) {
> + val->intval = 0;
> + break;
> + }
> +
> + ret = sc2731_charger_get_current_limit(info, &cur);
> + if (ret)
> + return ret;
> +
> + val->intval = cur;
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +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;
> +
> + /* set current limitation and start to charge */
> + if (limit > 0) {
> + ret = sc2731_charger_set_current_limit(info, limit);
> + if (ret)
> + return ret;
> +
> + ret = sc2731_charger_set_current(info, limit);
> + if (ret)
> + return ret;
> +
> + ret = sc2731_charger_start_charge(info);
> + if (ret)
> + return ret;
> +
> + info->charging = true;
> + return 0;
> + }
> +
> + /* Stop charging */
> + sc2731_charger_stop_charge(info);
> + info->charging = false;
Here and in other places (get_property) you depend on information from
USB phy. But maybe your device already provides information whether it
is charging or not. It should be more accurate.
> +
> + return 0;
> +}
> +
> +static int sc2731_charger_hw_init(struct sc2731_charger_info *info)
> +{
> + int ret;
> +
> + /* Enable charger module */
> + ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1,
> + SC2731_CHARGE_EN, SC2731_CHARGE_EN);
> + if (ret)
> + return ret;
> +
> + /* Set default charge termination current to 120 mA */
> + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2,
> + SC2731_TERMINATION_CUR_MASK, 0x2);
Looks like DeviceTree property.
> + if (ret)
> + goto error;
> +
> + /* Set default charge termination voltage to 4.35V */
Looks like DeviceTree property.
Best regards,
Krzysztof
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