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power: supply: bq27xxx: Ensure power_supply_changed() is called on current sign changes

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On gauges where the current register is signed, there is no charging
flag in the flags register. So only checking flags will not result
in power_supply_changed() getting called when e.g. a charger is plugged
in and the current sign changes from negative (discharging) to
positive (charging).

This causes userspace's notion of the status to lag until userspace
does a poll.

And when a power_supply_leds.c LED trigger is used to indicate charging
status with a LED, this LED will lag until the capacity percentage
changes, which may take many minutes (because the LED trigger only is
updated on power_supply_changed() calls).

Fix this by calling bq27xxx_battery_current_and_status() on gauges with
a signed current register and checking if the status has changed.

Fixes: 297a533b3e ("bq27x00: Cache battery registers")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Hans de Goede 2023-04-15 20:23:37 +02:00 committed by Sebastian Reichel
parent ff4c4a2a44
commit 939a116142
2 changed files with 15 additions and 1 deletions
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13
drivers/power/supply/bq27xxx_battery.c
View File

@ -1836,6 +1836,7 @@ static int bq27xxx_battery_current_and_status(
static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
{
union power_supply_propval status = di->last_status;
struct bq27xxx_reg_cache cache = {0, };
bool has_singe_flag = di->opts & BQ27XXX_O_ZERO;
@ -1860,14 +1861,24 @@ static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
cache.cycle_count = bq27xxx_battery_read_cyct(di);
/*
* On gauges with signed current reporting the current must be
* checked to detect charging <-> discharging status changes.
*/
if (!(di->opts & BQ27XXX_O_ZERO))
bq27xxx_battery_current_and_status(di, NULL, &status, &cache);
/* We only have to read charge design full once */
if (di->charge_design_full <= 0)
di->charge_design_full = bq27xxx_battery_read_dcap(di);
}
if ((di->cache.capacity != cache.capacity) ||
(di->cache.flags != cache.flags))
(di->cache.flags != cache.flags) ||
(di->last_status.intval != status.intval)) {
di->last_status.intval = status.intval;
power_supply_changed(di->bat);
}
if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
di->cache = cache;

3
include/linux/power/bq27xxx_battery.h
View File

@ -2,6 +2,8 @@
#ifndef __LINUX_BQ27X00_BATTERY_H__
#define __LINUX_BQ27X00_BATTERY_H__
#include <linux/power_supply.h>
enum bq27xxx_chip {
BQ27000 = 1, /* bq27000, bq27200 */
BQ27010, /* bq27010, bq27210 */
@ -70,6 +72,7 @@ struct bq27xxx_device_info {
int charge_design_full;
bool removed;
unsigned long last_update;
union power_supply_propval last_status;
struct delayed_work work;
struct power_supply *bat;
struct list_head list;