This patch adds the binding documentation for Spreadtrum SC2731 charger
device.
Signed-off-by: Baolin Wang <[email protected]>
---
Changes from v1:
- Add parent node.
- Add some battery standard properties.
---
.../bindings/power/supply/sc2731_charger.txt | 40 ++++++++++++++++++++
1 file changed, 40 insertions(+)
create mode 100644 Documentation/devicetree/bindings/power/supply/sc2731_charger.txt
diff --git a/Documentation/devicetree/bindings/power/supply/sc2731_charger.txt b/Documentation/devicetree/bindings/power/supply/sc2731_charger.txt
new file mode 100644
index 0000000..5266fab
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/supply/sc2731_charger.txt
@@ -0,0 +1,40 @@
+Spreadtrum SC2731 PMIC battery charger binding
+
+Required properties:
+ - compatible: Should be "sprd,sc2731-charger".
+ - reg: Address offset of charger register.
+ - phys: Contains a phandle to the USB phy.
+
+Optional Properties:
+- monitored-battery: phandle of battery characteristics devicetree node.
+ The charger uses the following battery properties:
+- charge-term-current-microamp: current for charge termination phase.
+- constant-charge-voltage-max-microvolt: maximum constant input voltage.
+ See Documentation/devicetree/bindings/power/supply/battery.txt
+
+Example:
+
+ bat: battery {
+ compatible = "simple-battery";
+ charge-term-current-microamp = <120000>;
+ constant-charge-voltage-max-microvolt = <4350000>;
+ ......
+ };
+
+ sc2731_pmic: pmic@0 {
+ compatible = "sprd,sc2731";
+ reg = <0>;
+ spi-max-frequency = <26000000>;
+ interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ charger@0 {
+ compatible = "sprd,sc2731-charger";
+ reg = <0x0>;
+ phys = <&ssphy>;
+ monitored-battery = <&bat>;
+ };
+ };
--
1.7.9.5
This patch adds the SC2731 PMIC switch charger support.
Signed-off-by: Baolin Wang <[email protected]>
---
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;
+
+ 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;
+
+ 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;
+
+ 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;
+
+ 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
On Mon, 3 Sep 2018 at 10:56, Baolin Wang <[email protected]> wrote:
>
> This patch adds the binding documentation for Spreadtrum SC2731 charger
> device.
>
> Signed-off-by: Baolin Wang <[email protected]>
> ---
> Changes from v1:
> - Add parent node.
> - Add some battery standard properties.
> ---
> .../bindings/power/supply/sc2731_charger.txt | 40 ++++++++++++++++++++
> 1 file changed, 40 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/power/supply/sc2731_charger.txt
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Best regards,
Krzysztof
On Mon, 3 Sep 2018 at 10:56, Baolin Wang <[email protected]> wrote:
>
> This patch adds the SC2731 PMIC switch charger support.
>
> Signed-off-by: Baolin Wang <[email protected]>
> ---
> 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
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Best regards,
Krzysztof
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 <[email protected]>
> ---
The power-supply sysfs files uses uA instead of mA, otherwise the
driver and the binding looks fine to me.
-- 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).
> + 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).
> +
> + 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).
> + 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).
> + 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
>
Hi Sebastian,
On 16 September 2018 at 18:17, Sebastian Reichel
<[email protected]> 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 <[email protected]>
>> ---
>
> 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