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platform/x86: thinkpad_acpi: support force-discharge 

This adds support for the force-discharge charge_behaviour through the
embedded controller of ThinkPads.

Co-developed-by: Thomas Koch <linrunner@gmx.net>
Signed-off-by: Thomas Koch <linrunner@gmx.net>
Co-developed-by: Nicolò Piazzalunga <nicolopiazzalunga@gmail.com>
Signed-off-by: Nicolò Piazzalunga <nicolopiazzalunga@gmail.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20211123232704.25394-4-linux@weissschuh.net
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Thomas Weißschuh 2021-11-24 00:27:03 +01:00 committed by Hans de Goede
parent 539b9c94ac
commit b55d416d48
1 changed files with 127 additions and 4 deletions
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131
drivers/platform/x86/thinkpad_acpi.c
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@ -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,
};