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-rw-r--r--drivers/power/supply/Kconfig7
-rw-r--r--drivers/power/supply/Makefile1
-rw-r--r--drivers/power/supply/macsmc_power.c516
3 files changed, 524 insertions, 0 deletions
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 1aa8323ad9f6..780941701795 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -897,4 +897,11 @@ config BATTERY_UG3105
device is off or suspended, the functionality of this driver is
limited to reporting capacity only.
+config CHARGER_MACSMC
+ tristate "Apple SMC Charger / Battery support"
+ depends on APPLE_SMC
+ help
+ Say Y here to enable support for the charger and battery controls on
+ Apple SMC controllers, as used on Apple Silicon Macs.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 7f02f36aea55..bba0c6ad4101 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -108,3 +108,4 @@ obj-$(CONFIG_BATTERY_ACER_A500) += acer_a500_battery.o
obj-$(CONFIG_BATTERY_SURFACE) += surface_battery.o
obj-$(CONFIG_CHARGER_SURFACE) += surface_charger.o
obj-$(CONFIG_BATTERY_UG3105) += ug3105_battery.o
+obj-$(CONFIG_CHARGER_MACSMC) += macsmc_power.o
diff --git a/drivers/power/supply/macsmc_power.c b/drivers/power/supply/macsmc_power.c
new file mode 100644
index 000000000000..dee48ee8b5a4
--- /dev/null
+++ b/drivers/power/supply/macsmc_power.c
@@ -0,0 +1,516 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Apple SMC Power/Battery Management
+ * Copyright The Asahi Linux Contributors
+ */
+
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/macsmc.h>
+#include <linux/power_supply.h>
+
+#define MAX_STRING_LENGTH 256
+
+struct macsmc_power {
+ struct device *dev;
+ struct apple_smc *smc;
+
+ struct power_supply *batt;
+ char model_name[MAX_STRING_LENGTH];
+ char serial_number[MAX_STRING_LENGTH];
+ char mfg_date[MAX_STRING_LENGTH];
+
+ struct power_supply *ac;
+
+ struct notifier_block nb;
+};
+
+#define CHNC_BATTERY_FULL BIT(0)
+#define CHNC_NO_CHARGER BIT(7)
+#define CHNC_NOCHG_CH0C BIT(14)
+#define CHNC_NOCHG_CH0B_CH0K BIT(15)
+#define CHNC_BATTERY_FULL_2 BIT(18)
+#define CHNC_BMS_BUSY BIT(23)
+#define CHNC_NOAC_CH0J BIT(53)
+#define CHNC_NOAC_CH0I BIT(54)
+
+#define CH0R_LOWER_FLAGS GENMASK(15, 0)
+#define CH0R_NOAC_CH0I BIT(0)
+#define CH0R_NOAC_CH0J BIT(5)
+#define CH0R_BMS_BUSY BIT(8)
+#define CH0R_NOAC_CH0K BIT(9)
+
+#define CH0X_CH0C BIT(0)
+#define CH0X_CH0B BIT(1)
+
+static int macsmc_battery_get_status(struct macsmc_power *power)
+{
+ u64 nocharge_flags;
+ u32 nopower_flags;
+ u16 ac_current;
+ int ret;
+
+ /*
+ * Note: there are fallbacks in case some of these SMC keys disappear in the future
+ * or are not present on some machines. We treat the absence of the CHCE/CHCC/BSFC/CHSC
+ * flags as an error, since they are quite fundamental and simple booleans.
+ */
+
+ /*
+ * If power input is inhibited, we are definitely discharging.
+ * However, if the only reason is the BMS is doing a balancing cycle,
+ * go ahead and ignore that one to avoid spooking users.
+ */
+ ret = apple_smc_read_u32(power->smc, SMC_KEY(CH0R), &nopower_flags);
+ if (!ret && (nopower_flags & CH0R_LOWER_FLAGS & ~CH0R_BMS_BUSY))
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ /* If no charger is present, we are definitely discharging. */
+ ret = apple_smc_read_flag(power->smc, SMC_KEY(CHCE));
+ if (ret < 0)
+ return ret;
+ else if (!ret)
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ /* If AC is not charge capable, we are definitely discharging. */
+ ret = apple_smc_read_flag(power->smc, SMC_KEY(CHCC));
+ if (ret < 0)
+ return ret;
+ else if (!ret)
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ /*
+ * If the AC input current limit is tiny or 0, we are discharging no matter
+ * how much the BMS believes it can charge.
+ */
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(AC-i), &ac_current);
+ if (!ret && ac_current < 100)
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ /* If the battery is full, report it as such. */
+ ret = apple_smc_read_flag(power->smc, SMC_KEY(BSFC));
+ if (ret < 0)
+ return ret;
+ else if (ret)
+ return POWER_SUPPLY_STATUS_FULL;
+
+ /* If there are reasons we aren't charging... */
+ ret = apple_smc_read_u64(power->smc, SMC_KEY(CHNC), &nocharge_flags);
+ if (!ret) {
+ /* Perhaps the battery is full after all */
+ if (nocharge_flags & CHNC_BATTERY_FULL)
+ return POWER_SUPPLY_STATUS_FULL;
+ /* Or maybe the BMS is just busy doing something, if so call it charging anyway */
+ else if (nocharge_flags == CHNC_BMS_BUSY)
+ return POWER_SUPPLY_STATUS_CHARGING;
+ /* If we have other reasons we aren't charging, say we aren't */
+ else if (nocharge_flags)
+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
+ /* Else we're either charging or about to charge */
+ else
+ return POWER_SUPPLY_STATUS_CHARGING;
+ }
+
+ /* As a fallback, use the system charging flag. */
+ ret = apple_smc_read_flag(power->smc, SMC_KEY(CHSC));
+ if (ret < 0)
+ return ret;
+ if (!ret)
+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
+ else
+ return POWER_SUPPLY_STATUS_CHARGING;
+}
+
+static int macsmc_battery_get_charge_behaviour(struct macsmc_power *power)
+{
+ int ret;
+ u8 val;
+
+ /* CH0I returns a bitmask like the low byte of CH0R */
+ ret = apple_smc_read_u8(power->smc, SMC_KEY(CH0I), &val);
+ if (ret)
+ return ret;
+ if (val & CH0R_NOAC_CH0I)
+ return POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE;
+
+ /* CH0C returns a bitmask containing CH0B/CH0C flags */
+ ret = apple_smc_read_u8(power->smc, SMC_KEY(CH0C), &val);
+ if (ret)
+ return ret;
+ if (val & CH0X_CH0C)
+ return POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;
+ else
+ return POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
+}
+
+static int macsmc_battery_set_charge_behaviour(struct macsmc_power *power, int val)
+{
+ u8 ch0i, ch0c;
+ int ret;
+
+ /*
+ * CH0I/CH0C are "hard" controls that will allow the battery to run down to 0.
+ * CH0K/CH0B are "soft" controls that are reset to 0 when SOC drops below 50%;
+ * we don't expose these yet.
+ */
+
+ switch (val) {
+ case POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO:
+ ch0i = ch0c = 0;
+ break;
+ case POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE:
+ ch0i = 0;
+ ch0c = 1;
+ break;
+ case POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE:
+ ch0i = 1;
+ ch0c = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = apple_smc_write_u8(power->smc, SMC_KEY(CH0I), ch0i);
+ if (ret)
+ return ret;
+ return apple_smc_write_u8(power->smc, SMC_KEY(CH0C), ch0c);
+}
+
+static int macsmc_battery_get_date(const char *s, int *out)
+{
+ if (!isdigit(s[0]) || !isdigit(s[1]))
+ return -ENOTSUPP;
+
+ *out = (s[0] - '0') * 10 + s[1] - '0';
+ return 0;
+}
+
+static int macsmc_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct macsmc_power *power = power_supply_get_drvdata(psy);
+ int ret = 0;
+ u8 vu8;
+ u16 vu16;
+ u32 vu32;
+ s16 vs16;
+ s32 vs32;
+ s64 vs64;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = macsmc_battery_get_status(power);
+ ret = val->intval < 0 ? val->intval : 0;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = 1;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+ val->intval = macsmc_battery_get_charge_behaviour(power);
+ ret = val->intval < 0 ? val->intval : 0;
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0TE), &vu16);
+ val->intval = vu16 == 0xffff ? 0 : vu16 * 60;
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0TF), &vu16);
+ val->intval = vu16 == 0xffff ? 0 : vu16 * 60;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = apple_smc_read_u8(power->smc, SMC_KEY(BUIC), &vu8);
+ val->intval = vu8;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0AV), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = apple_smc_read_s16(power->smc, SMC_KEY(B0AC), &vs16);
+ val->intval = vs16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_POWER_NOW:
+ ret = apple_smc_read_s32(power->smc, SMC_KEY(B0AP), &vs32);
+ val->intval = vs32 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(BITV), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0RC), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = apple_smc_read_u32(power->smc, SMC_KEY(CSIL), &vu32);
+ val->intval = vu32 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0RI), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0RV), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0DC), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0FC), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0RM), &vu16);
+ val->intval = swab16(vu16) * 1000;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0AT), &vu16);
+ val->intval = vu16 - 2732;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+ ret = apple_smc_read_s64(power->smc, SMC_KEY(BAAC), &vs64);
+ val->intval = vs64;
+ break;
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(B0CT), &vu16);
+ val->intval = vu16;
+ break;
+ case POWER_SUPPLY_PROP_SCOPE:
+ val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = apple_smc_read_flag(power->smc, SMC_KEY(BBAD));
+ val->intval = ret == 1 ? POWER_SUPPLY_HEALTH_DEAD : POWER_SUPPLY_HEALTH_GOOD;
+ ret = ret < 0 ? ret : 0;
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = power->model_name;
+ break;
+ case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+ val->strval = power->serial_number;
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
+ ret = macsmc_battery_get_date(&power->mfg_date[0], &val->intval);
+ val->intval += 2000 - 8; /* -8 is a fixup for a firmware bug... */
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURE_MONTH:
+ ret = macsmc_battery_get_date(&power->mfg_date[2], &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURE_DAY:
+ ret = macsmc_battery_get_date(&power->mfg_date[4], &val->intval);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int macsmc_battery_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct macsmc_power *power = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+ return macsmc_battery_set_charge_behaviour(power, val->intval);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int macsmc_battery_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static enum power_supply_property macsmc_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+ POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_POWER_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_CHARGE_COUNTER,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_SCOPE,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+ POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
+ POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
+ POWER_SUPPLY_PROP_MANUFACTURE_DAY,
+};
+
+static const struct power_supply_desc macsmc_battery_desc = {
+ .name = "macsmc-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = macsmc_battery_get_property,
+ .set_property = macsmc_battery_set_property,
+ .property_is_writeable = macsmc_battery_property_is_writeable,
+ .properties = macsmc_battery_props,
+ .num_properties = ARRAY_SIZE(macsmc_battery_props),
+};
+
+static int macsmc_ac_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct macsmc_power *power = power_supply_get_drvdata(psy);
+ int ret = 0;
+ u16 vu16;
+ u32 vu32;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ ret = apple_smc_read_u32(power->smc, SMC_KEY(CHIS), &vu32);
+ val->intval = !!vu32;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(AC-n), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ ret = apple_smc_read_u16(power->smc, SMC_KEY(AC-i), &vu16);
+ val->intval = vu16 * 1000;
+ break;
+ case POWER_SUPPLY_PROP_INPUT_POWER_LIMIT:
+ ret = apple_smc_read_u32(power->smc, SMC_KEY(ACPW), &vu32);
+ val->intval = vu32 * 1000;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static enum power_supply_property macsmc_ac_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+ POWER_SUPPLY_PROP_INPUT_POWER_LIMIT,
+};
+
+static const struct power_supply_desc macsmc_ac_desc = {
+ .name = "macsmc-ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .get_property = macsmc_ac_get_property,
+ .properties = macsmc_ac_props,
+ .num_properties = ARRAY_SIZE(macsmc_ac_props),
+};
+
+static int macsmc_power_event(struct notifier_block *nb, unsigned long event, void *data)
+{
+ struct macsmc_power *power = container_of(nb, struct macsmc_power, nb);
+
+ if ((event & 0xffffff00) == 0x71010100) {
+ bool charging = (event & 0xff) != 0;
+
+ dev_info(power->dev, "Charging: %d\n", charging);
+ power_supply_changed(power->batt);
+ power_supply_changed(power->ac);
+
+ return NOTIFY_OK;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static int macsmc_power_probe(struct platform_device *pdev)
+{
+ struct apple_smc *smc = dev_get_drvdata(pdev->dev.parent);
+ struct power_supply_config psy_cfg = {};
+ struct macsmc_power *power;
+ int ret;
+
+ power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
+ if (!power)
+ return -ENOMEM;
+
+ power->dev = &pdev->dev;
+ power->smc = smc;
+ dev_set_drvdata(&pdev->dev, power);
+
+ /* Ignore devices without a charger/battery */
+ if (macsmc_battery_get_status(power) <= POWER_SUPPLY_STATUS_UNKNOWN)
+ return -ENODEV;
+
+ /* Fetch string properties */
+ apple_smc_read(smc, SMC_KEY(BMDN), power->model_name, sizeof(power->model_name) - 1);
+ apple_smc_read(smc, SMC_KEY(BMSN), power->serial_number, sizeof(power->serial_number) - 1);
+ apple_smc_read(smc, SMC_KEY(BMDT), power->mfg_date, sizeof(power->mfg_date) - 1);
+
+ /* Turn off the "optimized battery charging" flags, in case macOS left them on */
+ apple_smc_write_u8(power->smc, SMC_KEY(CH0K), 0);
+ apple_smc_write_u8(power->smc, SMC_KEY(CH0B), 0);
+
+ psy_cfg.drv_data = power;
+ power->batt = devm_power_supply_register(&pdev->dev, &macsmc_battery_desc, &psy_cfg);
+ if (IS_ERR(power->batt)) {
+ dev_err(&pdev->dev, "Failed to register battery\n");
+ ret = PTR_ERR(power->batt);
+ return ret;
+ }
+
+ power->ac = devm_power_supply_register(&pdev->dev, &macsmc_ac_desc, &psy_cfg);
+ if (IS_ERR(power->ac)) {
+ dev_err(&pdev->dev, "Failed to register AC adapter\n");
+ ret = PTR_ERR(power->ac);
+ return ret;
+ }
+
+ power->nb.notifier_call = macsmc_power_event;
+ apple_smc_register_notifier(power->smc, &power->nb);
+
+ return 0;
+}
+
+static int macsmc_power_remove(struct platform_device *pdev)
+{
+ struct macsmc_power *power = dev_get_drvdata(&pdev->dev);
+
+ apple_smc_unregister_notifier(power->smc, &power->nb);
+
+ return 0;
+}
+
+static struct platform_driver macsmc_power_driver = {
+ .driver = {
+ .name = "macsmc-power",
+ .owner = THIS_MODULE,
+ },
+ .probe = macsmc_power_probe,
+ .remove = macsmc_power_remove,
+};
+module_platform_driver(macsmc_power_driver);
+
+MODULE_LICENSE("Dual MIT/GPL");
+MODULE_DESCRIPTION("Apple SMC battery and power management driver");
+MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
+MODULE_ALIAS("platform:macsmc-power");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 08:34:07 +0000