On the Huawei Matebook E Go (sc8280xp) tablet the EC provides access
to the adapter and battery status. Add the driver to read power supply
status on the tablet.
Signed-off-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
---
drivers/power/supply/Kconfig | 9 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/huawei-gaokun-battery.c | 446 +++++++++++++++++++
3 files changed, 456 insertions(+)
create mode 100644 drivers/power/supply/huawei-gaokun-battery.c
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 9f2eef678..e385d0a1f 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -161,6 +161,15 @@ config BATTERY_DS2782
Say Y here to enable support for the DS2782/DS2786 standalone battery
gas-gauge.
+config BATTERY_HUAWEI_GAOKUN
+ tristate "Huawei Matebook E Go (sc8280xp) battery"
+ depends on EC_HUAWEI_GAOKUN
+ help
+ This driver enables battery support on the Huawei Matebook E Go.
+
+ To compile the driver as a module, choose M here: the module will be
+ called huawei-gaokun-battery.
+
config BATTERY_LEGO_EV3
tristate "LEGO MINDSTORMS EV3 battery"
depends on OF && IIO && GPIOLIB && (ARCH_DAVINCI_DA850 || COMPILE_TEST)
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 59c4a9f40..c0941a832 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_BATTERY_DS2781) += ds2781_battery.o
obj-$(CONFIG_BATTERY_DS2782) += ds2782_battery.o
obj-$(CONFIG_BATTERY_GAUGE_LTC2941) += ltc2941-battery-gauge.o
obj-$(CONFIG_BATTERY_GOLDFISH) += goldfish_battery.o
+obj-$(CONFIG_BATTERY_HUAWEI_GAOKUN) += huawei-gaokun-battery.o
obj-$(CONFIG_BATTERY_LEGO_EV3) += lego_ev3_battery.o
obj-$(CONFIG_BATTERY_LENOVO_YOGA_C630) += lenovo_yoga_c630_battery.o
obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
diff --git a/drivers/power/supply/huawei-gaokun-battery.c b/drivers/power/supply/huawei-gaokun-battery.c
new file mode 100644
index 000000000..40141b59e
--- /dev/null
+++ b/drivers/power/supply/huawei-gaokun-battery.c
@@ -0,0 +1,446 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * gaokun-battery - A power supply driver for HUAWEI Matebook E Go (sc8280xp)
+ *
+ * reference: drivers/power/supply/lenovo_yoga_c630_battery.c
+ * drivers/platform/arm64/acer-aspire1-ec.c
+ * drivers/acpi/battery.c
+ * drivers/acpi/ac.c
+ *
+ * Copyright (C) 2024 Pengyu Luo <mitltlatltl@xxxxxxxxx>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/power_supply.h>
+#include <linux/sprintf.h>
+
+#include <linux/platform_data/huawei-gaokun-ec.h>
+
+
+/* -------------------------------------------------------------------------- */
+/* String Data Reg */
+
+#define EC_BAT_VENDOR 0x01 /* from 0x01 to 0x0F, SUNWODA */
+#define EC_BAT_MODEL 0x11 /* from 0x11 to 0x1F, HB30A8P9ECW-22T */
+
+#define EC_ADP_STATUS 0x81
+#define EC_AC_STATUS BIT(0)
+#define EC_BAT_PRESENT BIT(1) /* BATC._STA */
+
+#define EC_BAT_STATUS 0x82 /* _BST */
+#define EC_BAT_DISCHARGING BIT(0)
+#define EC_BAT_CHARGING BIT(1)
+#define EC_BAT_CRITICAL BIT(2) /* Low Battery Level */
+#define EC_BAT_FULL BIT(3)
+
+/* -------------------------------------------------------------------------- */
+/* Word Data Reg */
+
+/* 0x5A: ?
+ * 0x5C: ?
+ * 0x5E: ?
+ * 0X60: ?
+ * 0x84: ?
+ */
+
+#define EC_BAT_STATUS_START 0x90
+#define EC_BAT_PERCENTAGE 0x90
+#define EC_BAT_VOLTAGE 0x92
+#define EC_BAT_CAPACITY 0x94
+#define EC_BAT_FULL_CAPACITY 0x96
+/* 0x98: ? */
+#define EC_BAT_CURRENT 0x9A
+/* 0x9C: ? */
+
+#define EC_BAT_INFO_START 0xA0
+/* 0xA0: POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT? */
+#define EC_BAT_DESIGN_CAPACITY 0xA2
+#define EC_BAT_DESIGN_VOLTAGE 0xA4
+#define EC_BAT_SERIAL_NUMBER 0xA6
+#define EC_BAT_CYCLE_COUNT 0xAA
+
+/* -------------------------------------------------------------------------- */
+/* Battery Event ID */
+
+#define EC_EVENT_BAT_A0 0xA0
+#define EC_EVENT_BAT_A1 0xA1
+#define EC_EVENT_BAT_A2 0xA2
+#define EC_EVENT_BAT_A3 0xA3
+#define EC_EVENT_BAT_B1 0xB1
+/* EVENT B1 A0 A1 repeat about every 1s 2s 3s respectively */
+
+/* ACPI _BIX field, Min sampling time, the duration between two _BST */
+#define CACHE_TIME 5000 /* cache time in milliseconds */
+
+#define MILLI_TO_MICRO 1000
+
+struct gaokun_psy_bat_status {
+ __le16 percentage_now; /* 0x90 */
+ __le16 voltage_now;
+ __le16 capacity_now;
+ __le16 full_capacity;
+ __le16 unknown1;
+ __le16 rate_now;
+ __le16 unknown2; /* 0x9C */
+} __packed;
+
+struct gaokun_psy_bat_info {
+ __le16 unknown3; /* 0xA0 */
+ __le16 design_capacity;
+ __le16 design_voltage;
+ __le16 serial_number;
+ __le16 padding2;
+ __le16 cycle_count; /* 0xAA */
+} __packed;
+
+struct gaokun_psy {
+ struct gaokun_ec *ec;
+ struct device *dev;
+ struct notifier_block nb;
+
+ struct power_supply *bat_psy;
+ struct power_supply *adp_psy;
+
+ unsigned long update_time;
+ struct gaokun_psy_bat_status status;
+ struct gaokun_psy_bat_info info;
+
+ char battery_model[0x10]; /* HB30A8P9ECW-22T, the real one is XXX-22A */
+ char battery_serial[0x10];
+ char battery_vendor[0x10];
+
+ int charge_now;
+ int online;
+ int bat_present;
+};
+
+/* -------------------------------------------------------------------------- */
+/* Adapter */
+
+static int gaokun_psy_get_adp_status(struct gaokun_psy *ecbat)
+{
+ /* _PSR */
+ int ret;
+ u8 online = 0;
+
+ ret = gaokun_ec_psy_read_byte(ecbat->ec, EC_ADP_STATUS, &online);
+ ecbat->online = !!(online & EC_AC_STATUS);
+
+ return ret;
+}
+
+static int gaokun_psy_get_adp_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+
+ if (gaokun_psy_get_adp_status(ecbat))
+ return -EIO;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = ecbat->online;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static enum power_supply_property gaokun_psy_adp_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static const struct power_supply_desc gaokun_psy_adp_desc = {
+ .name = "gaokun-ec-adapter",
+ .type = POWER_SUPPLY_TYPE_USB_TYPE_C,
+ .get_property = gaokun_psy_get_adp_property,
+ .properties = gaokun_psy_adp_props,
+ .num_properties = ARRAY_SIZE(gaokun_psy_adp_props),
+};
+
+/* -------------------------------------------------------------------------- */
+/* Battery */
+
+static inline void gaokun_psy_get_bat_present(struct gaokun_psy *ecbat)
+{
+ int ret;
+ u8 present;
+
+ /* Some kind of initialization */
+ gaokun_ec_write(ecbat->ec, (u8 []){0x02, 0xB2, 1, 0x90});
+
+ ret = gaokun_ec_psy_read_byte(ecbat->ec, EC_ADP_STATUS, &present);
+
+ ecbat->bat_present = ret ? false : !!(present & EC_BAT_PRESENT);
+}
+
+static inline int gaokun_psy_bat_present(struct gaokun_psy *ecbat)
+{
+ return ecbat->bat_present;
+}
+
+static int gaokun_psy_get_bat_info(struct gaokun_psy *ecbat)
+{
+ /* _BIX */
+ if (!gaokun_psy_bat_present(ecbat))
+ return 0;
+
+ return gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_INFO_START,
+ sizeof(ecbat->info), (u8 *)&ecbat->info);
+}
+
+static inline void gaokun_psy_update_bat_charge(struct gaokun_psy *ecbat)
+{
+ u8 charge = 0;
+
+ gaokun_ec_psy_read_byte(ecbat->ec, EC_BAT_STATUS, &charge);
+
+ charge = (charge == EC_BAT_CHARGING) * POWER_SUPPLY_STATUS_CHARGING
+ + (charge == EC_BAT_DISCHARGING) * POWER_SUPPLY_STATUS_DISCHARGING
+ + (charge == EC_BAT_FULL) * POWER_SUPPLY_STATUS_FULL;
+
+ ecbat->charge_now = charge;
+}
+
+static int gaokun_psy_get_bat_status(struct gaokun_psy *ecbat)
+{
+ /* _BST */
+ int ret;
+
+ if (time_before(jiffies, ecbat->update_time +
+ msecs_to_jiffies(CACHE_TIME)))
+ return 0;
+
+ gaokun_psy_update_bat_charge(ecbat);
+ ret = gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_STATUS_START,
+ sizeof(ecbat->status), (u8 *)&ecbat->status);
+
+ ecbat->update_time = jiffies;
+
+ return ret;
+}
+
+static inline void gaokun_psy_init(struct gaokun_psy *ecbat)
+{
+ gaokun_psy_get_bat_present(ecbat);
+ if (!gaokun_psy_bat_present(ecbat))
+ return;
+
+ gaokun_psy_get_bat_info(ecbat);
+
+ snprintf(ecbat->battery_serial, sizeof(ecbat->battery_serial),
+ "%d", le16_to_cpu(ecbat->info.serial_number));
+
+ gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_VENDOR,
+ sizeof(ecbat->battery_vendor) - 1,
+ ecbat->battery_vendor);
+
+ gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_MODEL,
+ sizeof(ecbat->battery_model) - 1,
+ ecbat->battery_model);
+
+ ecbat->battery_model[14] = 'A'; /* FIX UP */
+}
+
+static int gaokun_psy_get_bat_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+
+ if (gaokun_psy_bat_present(ecbat))
+ gaokun_psy_get_bat_status(ecbat);
+ else if (psp != POWER_SUPPLY_PROP_PRESENT)
+ return -ENODEV;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = ecbat->charge_now;
+ break;
+
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = ecbat->bat_present;
+ break;
+
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ val->intval = le16_to_cpu(ecbat->info.cycle_count);
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = le16_to_cpu(ecbat->info.design_voltage) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = le16_to_cpu(ecbat->status.voltage_now) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = (s16)le16_to_cpu(ecbat->status.rate_now) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval = le16_to_cpu(ecbat->info.design_capacity) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ val->intval = le16_to_cpu(ecbat->status.full_capacity) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ val->intval = le16_to_cpu(ecbat->status.capacity_now) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = le16_to_cpu(ecbat->status.percentage_now);
+ break;
+
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = ecbat->battery_model;
+ break;
+
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = ecbat->battery_vendor;
+ break;
+
+ case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+ val->strval = ecbat->battery_serial;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static enum power_supply_property gaokun_psy_bat_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+};
+
+static const struct power_supply_desc gaokun_psy_bat_desc = {
+ .name = "gaokun-ec-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = gaokun_psy_get_bat_property,
+ .properties = gaokun_psy_bat_props,
+ .num_properties = ARRAY_SIZE(gaokun_psy_bat_props),
+};
+
+static int gaokun_psy_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct gaokun_psy *ecbat = container_of(nb, struct gaokun_psy, nb);
+
+ switch (action) {
+ case EC_EVENT_BAT_A2:
+ case EC_EVENT_BAT_B1:
+ gaokun_psy_get_bat_info(ecbat);
+ break;
+
+ case EC_EVENT_BAT_A0:
+ gaokun_psy_get_adp_status(ecbat);
+ power_supply_changed(ecbat->adp_psy);
+ msleep(10);
+ fallthrough;
+
+ case EC_EVENT_BAT_A1:
+ case EC_EVENT_BAT_A3:
+ if (action == EC_EVENT_BAT_A3) {
+ gaokun_psy_get_bat_info(ecbat);
+ msleep(100);
+ }
+ gaokun_psy_get_bat_status(ecbat);
+ power_supply_changed(ecbat->bat_psy);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static int gaokun_psy_probe(struct auxiliary_device *adev,
+ const struct auxiliary_device_id *id)
+{
+ struct gaokun_ec *ec = adev->dev.platform_data;
+ struct power_supply_config psy_cfg = {};
+ struct device *dev = &adev->dev;
+ struct gaokun_psy *ecbat;
+
+ ecbat = devm_kzalloc(&adev->dev, sizeof(*ecbat), GFP_KERNEL);
+ if (!ecbat)
+ return -ENOMEM;
+
+ ecbat->ec = ec;
+ ecbat->dev = dev;
+ ecbat->nb.notifier_call = gaokun_psy_notify;
+
+ auxiliary_set_drvdata(adev, ecbat);
+
+ psy_cfg.drv_data = ecbat;
+ ecbat->adp_psy = devm_power_supply_register(dev, &gaokun_psy_adp_desc,
+ &psy_cfg);
+ if (IS_ERR(ecbat->adp_psy))
+ return dev_err_probe(dev, PTR_ERR(ecbat->adp_psy),
+ "Failed to register AC power supply\n");
+
+ psy_cfg.supplied_to = (char **)&gaokun_psy_bat_desc.name;
+ psy_cfg.num_supplicants = 1;
+ psy_cfg.no_wakeup_source = true;
+ ecbat->bat_psy = devm_power_supply_register(dev, &gaokun_psy_bat_desc,
+ &psy_cfg);
+ if (IS_ERR(ecbat->bat_psy))
+ return dev_err_probe(dev, PTR_ERR(ecbat->bat_psy),
+ "Failed to register battery power supply\n");
+
+ gaokun_psy_init(ecbat);
+
+ return gaokun_ec_register_notify(ec, &ecbat->nb);
+}
+
+static void gaokun_psy_remove(struct auxiliary_device *adev)
+{
+ struct gaokun_psy *ecbat = auxiliary_get_drvdata(adev);
+
+ gaokun_ec_unregister_notify(ecbat->ec, &ecbat->nb);
+}
+
+static const struct auxiliary_device_id gaokun_psy_id_table[] = {
+ { .name = GAOKUN_MOD_NAME "." GAOKUN_DEV_PSY, },
+ {}
+};
+MODULE_DEVICE_TABLE(auxiliary, gaokun_psy_id_table);
+
+static struct auxiliary_driver gaokun_psy_driver = {
+ .name = GAOKUN_DEV_PSY,
+ .id_table = gaokun_psy_id_table,
+ .probe = gaokun_psy_probe,
+ .remove = gaokun_psy_remove,
+};
+
+module_auxiliary_driver(gaokun_psy_driver);
+
+MODULE_DESCRIPTION("HUAWEI Matebook E Go psy driver");
+MODULE_LICENSE("GPL");
--
2.47.1
