From b55d416d48f5907f66218ae3d878e3bfb69ae4e6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= Date: Wed, 24 Nov 2021 00:27:03 +0100 Subject: platform/x86: thinkpad_acpi: support force-discharge MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This adds support for the force-discharge charge_behaviour through the embedded controller of ThinkPads. Co-developed-by: Thomas Koch Signed-off-by: Thomas Koch Co-developed-by: Nicolò Piazzalunga Signed-off-by: Nicolò Piazzalunga Signed-off-by: Thomas Weißschuh Acked-by: Sebastian Reichel Link: https://lore.kernel.org/r/20211123232704.25394-4-linux@weissschuh.net Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/platform/x86/thinkpad_acpi.c | 131 +++++++++++++++++++++++++++++++++-- 1 file changed, 127 insertions(+), 4 deletions(-) (limited to 'drivers/platform/x86/thinkpad_acpi.c') diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 38996e6e2a7a..4dea5337ec09 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -9214,6 +9214,8 @@ static struct ibm_struct mute_led_driver_data = { #define SET_START "BCCS" #define GET_STOP "BCSG" #define SET_STOP "BCSS" +#define GET_DISCHARGE "BDSG" +#define SET_DISCHARGE "BDSS" enum { BAT_ANY = 0, @@ -9230,6 +9232,7 @@ enum { /* This is used in the get/set helpers */ THRESHOLD_START, THRESHOLD_STOP, + FORCE_DISCHARGE, }; struct tpacpi_battery_data { @@ -9237,6 +9240,7 @@ struct tpacpi_battery_data { int start_support; int charge_stop; int stop_support; + unsigned int charge_behaviours; }; struct tpacpi_battery_driver_data { @@ -9294,6 +9298,12 @@ static int tpacpi_battery_get(int what, int battery, int *ret) if (*ret == 0) *ret = 100; return 0; + case FORCE_DISCHARGE: + if ACPI_FAILURE(tpacpi_battery_acpi_eval(GET_DISCHARGE, ret, battery)) + return -ENODEV; + /* The force discharge status is in bit 0 */ + *ret = *ret & 0x01; + return 0; default: pr_crit("wrong parameter: %d", what); return -EINVAL; @@ -9322,12 +9332,49 @@ static int tpacpi_battery_set(int what, int battery, int value) return -ENODEV; } return 0; + case FORCE_DISCHARGE: + /* Force discharge is in bit 0, + * break on AC attach is in bit 1 (won't work on some ThinkPads), + * battery ID is in bits 8-9, 2 bits. + */ + if (ACPI_FAILURE(tpacpi_battery_acpi_eval(SET_DISCHARGE, &ret, param))) { + pr_err("failed to set force discharge on %d", battery); + return -ENODEV; + } + return 0; default: pr_crit("wrong parameter: %d", what); return -EINVAL; } } +static int tpacpi_battery_set_validate(int what, int battery, int value) +{ + int ret, v; + + ret = tpacpi_battery_set(what, battery, value); + if (ret < 0) + return ret; + + ret = tpacpi_battery_get(what, battery, &v); + if (ret < 0) + return ret; + + if (v == value) + return 0; + + msleep(500); + + ret = tpacpi_battery_get(what, battery, &v); + if (ret < 0) + return ret; + + if (v == value) + return 0; + + return -EIO; +} + static int tpacpi_battery_probe(int battery) { int ret = 0; @@ -9340,6 +9387,8 @@ static int tpacpi_battery_probe(int battery) * 2) Check for support * 3) Get the current stop threshold * 4) Check for support + * 5) Get the current force discharge status + * 6) Check for support */ if (acpi_has_method(hkey_handle, GET_START)) { if ACPI_FAILURE(tpacpi_battery_acpi_eval(GET_START, &ret, battery)) { @@ -9376,10 +9425,25 @@ static int tpacpi_battery_probe(int battery) return -ENODEV; } } - pr_info("battery %d registered (start %d, stop %d)", - battery, - battery_info.batteries[battery].charge_start, - battery_info.batteries[battery].charge_stop); + if (acpi_has_method(hkey_handle, GET_DISCHARGE)) { + if (ACPI_FAILURE(tpacpi_battery_acpi_eval(GET_DISCHARGE, &ret, battery))) { + pr_err("Error probing battery discharge; %d\n", battery); + return -ENODEV; + } + /* Support is marked in bit 8 */ + if (ret & BIT(8)) + battery_info.batteries[battery].charge_behaviours |= + BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE); + } + + battery_info.batteries[battery].charge_behaviours |= + BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO); + + pr_info("battery %d registered (start %d, stop %d, behaviours: 0x%x)\n", + battery, + battery_info.batteries[battery].charge_start, + battery_info.batteries[battery].charge_stop, + battery_info.batteries[battery].charge_behaviours); return 0; } @@ -9514,6 +9578,28 @@ static ssize_t charge_control_end_threshold_show(struct device *device, return tpacpi_battery_show(THRESHOLD_STOP, device, buf); } +static ssize_t charge_behaviour_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + enum power_supply_charge_behaviour active = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO; + struct power_supply *supply = to_power_supply(dev); + unsigned int available; + int ret, battery; + + battery = tpacpi_battery_get_id(supply->desc->name); + available = battery_info.batteries[battery].charge_behaviours; + + if (available & BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE)) { + if (tpacpi_battery_get(FORCE_DISCHARGE, battery, &ret)) + return -ENODEV; + if (ret) + active = POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE; + } + + return power_supply_charge_behaviour_show(dev, available, active, buf); +} + static ssize_t charge_control_start_threshold_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) @@ -9528,8 +9614,44 @@ static ssize_t charge_control_end_threshold_store(struct device *dev, return tpacpi_battery_store(THRESHOLD_STOP, dev, buf, count); } +static ssize_t charge_behaviour_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct power_supply *supply = to_power_supply(dev); + int selected, battery, ret = 0; + unsigned int available; + + battery = tpacpi_battery_get_id(supply->desc->name); + available = battery_info.batteries[battery].charge_behaviours; + selected = power_supply_charge_behaviour_parse(available, buf); + + if (selected < 0) + return selected; + + switch (selected) { + case POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO: + if (available & BIT(POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE)) + ret = tpacpi_battery_set_validate(FORCE_DISCHARGE, battery, 0); + if (ret < 0) + return ret; + break; + case POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE: + ret = tpacpi_battery_set_validate(FORCE_DISCHARGE, battery, 1); + if (ret < 0) + return ret; + break; + default: + dev_err(dev, "Unexpected charge behaviour: %d\n", selected); + return -EINVAL; + } + + return count; +} + static DEVICE_ATTR_RW(charge_control_start_threshold); static DEVICE_ATTR_RW(charge_control_end_threshold); +static DEVICE_ATTR_RW(charge_behaviour); static struct device_attribute dev_attr_charge_start_threshold = __ATTR( charge_start_threshold, 0644, @@ -9548,6 +9670,7 @@ static struct attribute *tpacpi_battery_attrs[] = { &dev_attr_charge_control_end_threshold.attr, &dev_attr_charge_start_threshold.attr, &dev_attr_charge_stop_threshold.attr, + &dev_attr_charge_behaviour.attr, NULL, }; -- cgit v1.2.3