Re: [PATCH v3 7/8] power: supply: qcom_battmgr: Add charge control support

Neil Armstrong
2025-09-03T08:30:00Z

On 26/08/2025 09:18, Fenglin Wu via B4 Relay wrote:
> From: Fenglin Wu <fenglin.wu@oss.qualcomm.com>
>
> Add charge control support for SM8550 and X1E80100. It's supported
> with below two power supply properties:
>
> charge_control_end_threshold: The battery SoC (State of Charge)
> threshold at which the charging should be terminated.
>
> charge_control_start_threshold: The battery SoC threshold at
> which the charging should be resumed.
>
> Signed-off-by: Fenglin Wu <fenglin.wu@oss.qualcomm.com>
> ---
> drivers/power/supply/qcom_battmgr.c | 290 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 283 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
> index 174d3f83ac2b070bb90c21a498686e91cc629ebe..23c68eb942f1b213f634e31a45420b3e113e2764 100644
> --- a/drivers/power/supply/qcom_battmgr.c
> +++ b/drivers/power/supply/qcom_battmgr.c
> @@ -7,6 +7,7 @@
> #include <linux/auxiliary_bus.h>
> #include <linux/module.h>
> #include <linux/mutex.h>
> +#include <linux/nvmem-consumer.h>
> #include <linux/of_device.h>
> #include <linux/power_supply.h>
> #include <linux/property.h>
> @@ -68,6 +69,9 @@ enum qcom_battmgr_variant {
> #define BATT_RESISTANCE 21
> #define BATT_POWER_NOW 22
> #define BATT_POWER_AVG 23
> +#define BATT_CHG_CTRL_EN 24
> +#define BATT_CHG_CTRL_START_THR 25
> +#define BATT_CHG_CTRL_END_THR 26
>
> #define BATTMGR_USB_PROPERTY_GET 0x32
> #define BATTMGR_USB_PROPERTY_SET 0x33
> @@ -92,6 +96,13 @@ enum qcom_battmgr_variant {
> #define WLS_TYPE 5
> #define WLS_BOOST_EN 6
>
> +#define BATTMGR_CHG_CTRL_LIMIT_EN 0x48
> +#define CHARGE_CTRL_START_THR_MIN 50
> +#define CHARGE_CTRL_START_THR_MAX 95
> +#define CHARGE_CTRL_END_THR_MIN 55
> +#define CHARGE_CTRL_END_THR_MAX 100
> +#define CHARGE_CTRL_DELTA_SOC 5
> +
> struct qcom_battmgr_enable_request {
> struct pmic_glink_hdr hdr;
> __le32 battery_id;
> @@ -126,6 +137,13 @@ struct qcom_battmgr_discharge_time_request {
> __le32 reserved;
> };
>
> +struct qcom_battmgr_charge_ctrl_request {
> + struct pmic_glink_hdr hdr;
> + __le32 enable;
> + __le32 target_soc;
> + __le32 delta_soc;
> +};
> +
> struct qcom_battmgr_message {
> struct pmic_glink_hdr hdr;
> union {
> @@ -238,6 +256,8 @@ struct qcom_battmgr_info {
> unsigned int capacity_warning;
> unsigned int cycle_count;
> unsigned int charge_count;
> + unsigned int charge_ctrl_start;
> + unsigned int charge_ctrl_end;
> char model_number[BATTMGR_STRING_LEN];
> char serial_number[BATTMGR_STRING_LEN];
> char oem_info[BATTMGR_STRING_LEN];
> @@ -426,6 +446,8 @@ static const u8 sm8350_bat_prop_map[] = {
> [POWER_SUPPLY_PROP_INTERNAL_RESISTANCE] = BATT_RESISTANCE,
> [POWER_SUPPLY_PROP_STATE_OF_HEALTH] = BATT_SOH,
> [POWER_SUPPLY_PROP_POWER_NOW] = BATT_POWER_NOW,
> + [POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD] = BATT_CHG_CTRL_START_THR,
> + [POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD] = BATT_CHG_CTRL_END_THR,
> };
>
> static int qcom_battmgr_bat_sm8350_update(struct qcom_battmgr *battmgr,
> @@ -496,7 +518,8 @@ static int qcom_battmgr_bat_get_property(struct power_supply *psy,
> if (!battmgr->service_up)
> return -EAGAIN;
>
> - if (battmgr->variant == QCOM_BATTMGR_SC8280XP)
> + if (battmgr->variant == QCOM_BATTMGR_SC8280XP ||
> + battmgr->variant == QCOM_BATTMGR_X1E80100)
> ret = qcom_battmgr_bat_sc8280xp_update(battmgr, psp);
> else
> ret = qcom_battmgr_bat_sm8350_update(battmgr, psp);
> @@ -601,6 +624,12 @@ static int qcom_battmgr_bat_get_property(struct power_supply *psy,
> case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
> val->intval = battmgr->status.charge_time;
> break;
> + case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
> + val->intval = battmgr->info.charge_ctrl_start;
> + break;
> + case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
> + val->intval = battmgr->info.charge_ctrl_end;
> + break;
> case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
> val->intval = battmgr->info.year;
> break;
> @@ -626,6 +655,149 @@ static int qcom_battmgr_bat_get_property(struct power_supply *psy,
> return 0;
> }
>
> +static int qcom_battmgr_set_charge_control(struct qcom_battmgr *battmgr,
> + u32 target_soc, u32 delta_soc)
> +{
> + struct qcom_battmgr_charge_ctrl_request request = {
> + .hdr.owner = cpu_to_le32(PMIC_GLINK_OWNER_BATTMGR),
> + .hdr.type = cpu_to_le32(PMIC_GLINK_REQ_RESP),
> + .hdr.opcode = cpu_to_le32(BATTMGR_CHG_CTRL_LIMIT_EN),
> + .enable = cpu_to_le32(1),
> + .target_soc = cpu_to_le32(target_soc),
> + .delta_soc = cpu_to_le32(delta_soc),
> + };
> +
> + return qcom_battmgr_request(battmgr, &request, sizeof(request));
> +}
> +
> +static int qcom_battmgr_set_charge_start_threshold(struct qcom_battmgr *battmgr, int start_soc)
> +{
> + u32 target_soc, delta_soc;
> + int ret;
> +
> + if (start_soc < CHARGE_CTRL_START_THR_MIN ||
> + start_soc > CHARGE_CTRL_START_THR_MAX) {
> + dev_err(battmgr->dev, "charge control start threshold exceed range: [%u - %u]\n",
> + CHARGE_CTRL_START_THR_MIN, CHARGE_CTRL_START_THR_MAX);
> + return -EINVAL;
> + }
> +
> + /*
> + * If the new start threshold is larger than the old end threshold,
> + * move the end threshold one step (DELTA_SOC) after the new start
> + * threshold.
> + */
> + if (start_soc > battmgr->info.charge_ctrl_end) {
> + target_soc = start_soc + CHARGE_CTRL_DELTA_SOC;
> + target_soc = min_t(u32, target_soc, CHARGE_CTRL_END_THR_MAX);
> + delta_soc = target_soc - start_soc;
> + delta_soc = min_t(u32, delta_soc, CHARGE_CTRL_DELTA_SOC);
> + } else {
> + target_soc = battmgr->info.charge_ctrl_end;
> + delta_soc = battmgr->info.charge_ctrl_end - start_soc;
> + }
> +
> + mutex_lock(&battmgr->lock);
> + ret = qcom_battmgr_set_charge_control(battmgr, target_soc, delta_soc);
> + mutex_unlock(&battmgr->lock);
> + if (!ret) {
> + battmgr->info.charge_ctrl_start = start_soc;
> + battmgr->info.charge_ctrl_end = target_soc;
> + }
> +
> + return 0;
> +}
> +
> +static int qcom_battmgr_set_charge_end_threshold(struct qcom_battmgr *battmgr, int end_soc)
> +{
> + u32 delta_soc = CHARGE_CTRL_DELTA_SOC;
> + int ret;
> +
> + if (end_soc < CHARGE_CTRL_END_THR_MIN ||
> + end_soc > CHARGE_CTRL_END_THR_MAX) {
> + dev_err(battmgr->dev, "charge control end threshold exceed range: [%u - %u]\n",
> + CHARGE_CTRL_END_THR_MIN, CHARGE_CTRL_END_THR_MAX);
> + return -EINVAL;
> + }
> +
> + if (battmgr->info.charge_ctrl_start && end_soc > battmgr->info.charge_ctrl_start)
> + delta_soc = end_soc - battmgr->info.charge_ctrl_start;
> +
> + mutex_lock(&battmgr->lock);
> + ret = qcom_battmgr_set_charge_control(battmgr, end_soc, delta_soc);
> + mutex_unlock(&battmgr->lock);
> + if (!ret) {
> + battmgr->info.charge_ctrl_start = end_soc - delta_soc;
> + battmgr->info.charge_ctrl_end = end_soc;
> + }
> +
> + return 0;
> +}
> +
> +static int qcom_battmgr_charge_control_thresholds_init(struct qcom_battmgr *battmgr)
> +{
> + int ret;
> + u8 en, end_soc, start_soc, delta_soc;
> +
> + ret = nvmem_cell_read_u8(battmgr->dev->parent, "charge_limit_en", &en);
> + if (!ret && en != 0) {
> + ret = nvmem_cell_read_u8(battmgr->dev->parent, "charge_limit_end", &end_soc);
> + if (ret < 0)
> + return ret;
> +
> + ret = nvmem_cell_read_u8(battmgr->dev->parent, "charge_limit_delta", &delta_soc);
> + if (ret < 0)
> + return ret;
> +
> + if (delta_soc >= end_soc)
> + return -EINVAL;
> +
> + start_soc = end_soc - delta_soc;
> + end_soc = clamp(end_soc, CHARGE_CTRL_END_THR_MIN, CHARGE_CTRL_END_THR_MAX);
> + start_soc = clamp(start_soc, CHARGE_CTRL_START_THR_MIN, CHARGE_CTRL_START_THR_MAX);
> +
> + battmgr->info.charge_ctrl_start = start_soc;
> + battmgr->info.charge_ctrl_end = end_soc;
> + }
> +
> + return 0;
> +}
> +
> +static int qcom_battmgr_bat_is_writeable(struct power_supply *psy,
> + enum power_supply_property psp)
> +{
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
> + case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
> + return 1;
> + default:
> + return 0;
> + }
> +
> + return 0;
> +}
> +
> +static int qcom_battmgr_bat_set_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + const union power_supply_propval *pval)
> +{
> + struct qcom_battmgr *battmgr = power_supply_get_drvdata(psy);
> +
> + if (!battmgr->service_up)
> + return -EAGAIN;
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
> + return qcom_battmgr_set_charge_start_threshold(battmgr, pval->intval);
> + case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
> + return qcom_battmgr_set_charge_end_threshold(battmgr, pval->intval);
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static const enum power_supply_property sc8280xp_bat_props[] = {
> POWER_SUPPLY_PROP_STATUS,
> POWER_SUPPLY_PROP_PRESENT,
> @@ -659,6 +831,43 @@ static const struct power_supply_desc sc8280xp_bat_psy_desc = {
> .get_property = qcom_battmgr_bat_get_property,
> };
>
> +static const enum power_supply_property x1e80100_bat_props[] = {
> + POWER_SUPPLY_PROP_STATUS,
> + POWER_SUPPLY_PROP_PRESENT,
> + POWER_SUPPLY_PROP_TECHNOLOGY,
> + POWER_SUPPLY_PROP_CYCLE_COUNT,
> + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
> + POWER_SUPPLY_PROP_VOLTAGE_NOW,
> + POWER_SUPPLY_PROP_POWER_NOW,
> + POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
> + POWER_SUPPLY_PROP_CHARGE_FULL,
> + POWER_SUPPLY_PROP_CHARGE_EMPTY,
> + POWER_SUPPLY_PROP_CHARGE_NOW,
> + POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
> + POWER_SUPPLY_PROP_ENERGY_FULL,
> + POWER_SUPPLY_PROP_ENERGY_EMPTY,
> + POWER_SUPPLY_PROP_ENERGY_NOW,
> + POWER_SUPPLY_PROP_TEMP,
> + POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
> + POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
> + POWER_SUPPLY_PROP_MANUFACTURE_DAY,
> + POWER_SUPPLY_PROP_MODEL_NAME,
> + POWER_SUPPLY_PROP_MANUFACTURER,
> + POWER_SUPPLY_PROP_SERIAL_NUMBER,
> + POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD,
> + POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD,

Is it expected to _not_ have POWER_SUPPLY_PROP_STATE_OF_HEALTH & POWER_SUPPLY_PROP_INTERNAL_RESISTANCE here ?

Neil

> +};
> +
> +static const struct power_supply_desc x1e80100_bat_psy_desc = {
> + .name = "qcom-battmgr-bat",
> + .type = POWER_SUPPLY_TYPE_BATTERY,
> + .properties = x1e80100_bat_props,
> + .num_properties = ARRAY_SIZE(x1e80100_bat_props),
> + .get_property = qcom_battmgr_bat_get_property,
> + .set_property = qcom_battmgr_bat_set_property,
> + .property_is_writeable = qcom_battmgr_bat_is_writeable,
> +};
> +
> static const enum power_supply_property sm8350_bat_props[] = {
> POWER_SUPPLY_PROP_STATUS,
> POWER_SUPPLY_PROP_HEALTH,
> @@ -691,6 +900,42 @@ static const struct power_supply_desc sm8350_bat_psy_desc = {
> .get_property = qcom_battmgr_bat_get_property,
> };
>
> +static const enum power_supply_property sm8550_bat_props[] = {
> + POWER_SUPPLY_PROP_STATUS,
> + POWER_SUPPLY_PROP_HEALTH,
> + POWER_SUPPLY_PROP_PRESENT,
> + POWER_SUPPLY_PROP_CHARGE_TYPE,
> + POWER_SUPPLY_PROP_CAPACITY,
> + POWER_SUPPLY_PROP_VOLTAGE_OCV,
> + POWER_SUPPLY_PROP_VOLTAGE_NOW,
> + POWER_SUPPLY_PROP_VOLTAGE_MAX,
> + POWER_SUPPLY_PROP_CURRENT_NOW,
> + POWER_SUPPLY_PROP_TEMP,
> + POWER_SUPPLY_PROP_TECHNOLOGY,
> + POWER_SUPPLY_PROP_CHARGE_COUNTER,
> + POWER_SUPPLY_PROP_CYCLE_COUNT,
> + POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
> + POWER_SUPPLY_PROP_CHARGE_FULL,
> + POWER_SUPPLY_PROP_MODEL_NAME,
> + POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
> + POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
> + POWER_SUPPLY_PROP_INTERNAL_RESISTANCE,
> + POWER_SUPPLY_PROP_STATE_OF_HEALTH,
> + POWER_SUPPLY_PROP_POWER_NOW,
> + POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD,
> + POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD,
> +};
> +
> +static const struct power_supply_desc sm8550_bat_psy_desc = {
> + .name = "qcom-battmgr-bat",
> + .type = POWER_SUPPLY_TYPE_BATTERY,
> + .properties = sm8550_bat_props,
> + .num_properties = ARRAY_SIZE(sm8550_bat_props),
> + .get_property = qcom_battmgr_bat_get_property,
> + .set_property = qcom_battmgr_bat_set_property,
> + .property_is_writeable = qcom_battmgr_bat_is_writeable,
> +};
> +
> static int qcom_battmgr_ac_get_property(struct power_supply *psy,
> enum power_supply_property psp,
> union power_supply_propval *val)
> @@ -766,7 +1011,8 @@ static int qcom_battmgr_usb_get_property(struct power_supply *psy,
> if (!battmgr->service_up)
> return -EAGAIN;
>
> - if (battmgr->variant == QCOM_BATTMGR_SC8280XP)
> + if (battmgr->variant == QCOM_BATTMGR_SC8280XP ||
> + battmgr->variant == QCOM_BATTMGR_X1E80100)
> ret = qcom_battmgr_bat_sc8280xp_update(battmgr, psp);
> else
> ret = qcom_battmgr_usb_sm8350_update(battmgr, psp);
> @@ -888,7 +1134,8 @@ static int qcom_battmgr_wls_get_property(struct power_supply *psy,
> if (!battmgr->service_up)
> return -EAGAIN;
>
> - if (battmgr->variant == QCOM_BATTMGR_SC8280XP)
> + if (battmgr->variant == QCOM_BATTMGR_SC8280XP ||
> + battmgr->variant == QCOM_BATTMGR_X1E80100)
> ret = qcom_battmgr_bat_sc8280xp_update(battmgr, psp);
> else
> ret = qcom_battmgr_wls_sm8350_update(battmgr, psp);
> @@ -1085,6 +1332,9 @@ static void qcom_battmgr_sc8280xp_callback(struct qcom_battmgr *battmgr,
> case BATTMGR_BAT_CHARGE_TIME:
> battmgr->status.charge_time = le32_to_cpu(resp->time);
> break;
> + case BATTMGR_CHG_CTRL_LIMIT_EN:
> + battmgr->error = 0;
> + break;
> default:
> dev_warn(battmgr->dev, "unknown message %#x\n", opcode);
> break;
> @@ -1198,6 +1448,12 @@ static void qcom_battmgr_sm8350_callback(struct qcom_battmgr *battmgr,
> case BATT_POWER_NOW:
> battmgr->status.power_now = le32_to_cpu(resp->intval.value);
> break;
> + case BATT_CHG_CTRL_START_THR:
> + battmgr->info.charge_ctrl_start = le32_to_cpu(resp->intval.value);
> + break;
> + case BATT_CHG_CTRL_END_THR:
> + battmgr->info.charge_ctrl_end = le32_to_cpu(resp->intval.value);
> + break;
> default:
> dev_warn(battmgr->dev, "unknown property %#x\n", property);
> break;
> @@ -1280,6 +1536,7 @@ static void qcom_battmgr_sm8350_callback(struct qcom_battmgr *battmgr,
> }
> break;
> case BATTMGR_REQUEST_NOTIFICATION:
> + case BATTMGR_CHG_CTRL_LIMIT_EN:
> battmgr->error = 0;
> break;
> default:
> @@ -1299,7 +1556,8 @@ static void qcom_battmgr_callback(const void *data, size_t len, void *priv)
>
> if (opcode == BATTMGR_NOTIFICATION)
> qcom_battmgr_notification(battmgr, data, len);
> - else if (battmgr->variant == QCOM_BATTMGR_SC8280XP)
> + else if (battmgr->variant == QCOM_BATTMGR_SC8280XP ||
> + battmgr->variant == QCOM_BATTMGR_X1E80100)
> qcom_battmgr_sc8280xp_callback(battmgr, data, len);
> else
> qcom_battmgr_sm8350_callback(battmgr, data, len);
> @@ -1346,11 +1604,13 @@ static char *qcom_battmgr_battery[] = { "battery" };
> static int qcom_battmgr_probe(struct auxiliary_device *adev,
> const struct auxiliary_device_id *id)
> {
> + const struct power_supply_desc *psy_desc;
> struct power_supply_config psy_cfg_supply = {};
> struct power_supply_config psy_cfg = {};
> const struct of_device_id *match;
> struct qcom_battmgr *battmgr;
> struct device *dev = &adev->dev;
> + int ret;
>
> battmgr = devm_kzalloc(dev, sizeof(*battmgr), GFP_KERNEL);
> if (!battmgr)
> @@ -1376,8 +1636,19 @@ static int qcom_battmgr_probe(struct auxiliary_device *adev,
> else
> battmgr->variant = QCOM_BATTMGR_SM8350;
>
> - if (battmgr->variant == QCOM_BATTMGR_SC8280XP) {
> - battmgr->bat_psy = devm_power_supply_register(dev, &sc8280xp_bat_psy_desc, &psy_cfg);
> + ret = qcom_battmgr_charge_control_thresholds_init(battmgr);
> + if (ret < 0)
> + return dev_err_probe(dev, ret,
> + "failed to init battery charge control thresholds\n");
> +
> + if (battmgr->variant == QCOM_BATTMGR_SC8280XP ||
> + battmgr->variant == QCOM_BATTMGR_X1E80100) {
> + if (battmgr->variant == QCOM_BATTMGR_X1E80100)
> + psy_desc = &x1e80100_bat_psy_desc;
> + else
> + psy_desc = &sc8280xp_bat_psy_desc;
> +
> + battmgr->bat_psy = devm_power_supply_register(dev, psy_desc, &psy_cfg);
> if (IS_ERR(battmgr->bat_psy))
> return dev_err_probe(dev, PTR_ERR(battmgr->bat_psy),
> "failed to register battery power supply\n");
> @@ -1397,7 +1668,12 @@ static int qcom_battmgr_probe(struct auxiliary_device *adev,
> return dev_err_probe(dev, PTR_ERR(battmgr->wls_psy),
> "failed to register wireless charing power supply\n");
> } else {
> - battmgr->bat_psy = devm_power_supply_register(dev, &sm8350_bat_psy_desc, &psy_cfg);
> + if (battmgr->variant == QCOM_BATTMGR_SM8550)
> + psy_desc = &sm8550_bat_psy_desc;
> + else
> + psy_desc = &sm8350_bat_psy_desc;
> +
> + battmgr->bat_psy = devm_power_supply_register(dev, psy_desc, &psy_cfg);
> if (IS_ERR(battmgr->bat_psy))
> return dev_err_probe(dev, PTR_ERR(battmgr->bat_psy),
> "failed to register battery power supply\n");
>