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author | Hans de Goede <hdegoede@redhat.com> | 2017-12-26 13:59:11 +0100 |
---|---|---|
committer | Sebastian Reichel <sre@kernel.org> | 2018-01-09 17:41:39 +0100 |
commit | 2b5a4b4bf2224f4f6b6631091bd51cb08d3094be (patch) | |
tree | 106d05c3511243dc552c9129b0e5c4a37c1c2c60 /drivers/power | |
parent | power: reset: account for const type of of_device_id.data (diff) | |
download | linux-2b5a4b4bf2224f4f6b6631091bd51cb08d3094be.tar.xz linux-2b5a4b4bf2224f4f6b6631091bd51cb08d3094be.zip |
power: supply: axp288_fuel_gauge: Rework get_status()
Relying on the (dis)charge current reporting for reporting FULL back to
userspace does not work really well and often leads to the reported status
getting stuck at e.g. 98/99% (the fuelgauge is not perfect) for hours.
What happens is that when the battery is full the axp288 keeps charging it
with a very low current. Until it is really really full and once really
really full, some inaccuracies in the adc lead to it then sometimes
reporting a small discharging rate, even though an external pwr source is
used. So we end up with a status of "charging" for hours after the battery
is actually already full and sometimes this then flip-flops to discharging.
This commit fixes this by first checking if a valid Vbus is present and if
it is present using the fuel-gauge's reported percentage to check for a
full battery.
This commit also changes how get_status() determines if the battery is
charging or discharging when not reporting it as full. We still use the
current direction for this, but instead of reading 4 extra registers for
this (2 16 bit regs), simplify things by using the current-direction bit
in the power-status register, which already gets read anyways.
This also reduces the amount of i2c reads to 1 when on battery and 2
when a valid Vbus is present.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Diffstat (limited to 'drivers/power')
-rw-r--r-- | drivers/power/supply/axp288_fuel_gauge.c | 43 |
1 files changed, 22 insertions, 21 deletions
diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c index eb60f75f00d7..c0b5e40b23e1 100644 --- a/drivers/power/supply/axp288_fuel_gauge.c +++ b/drivers/power/supply/axp288_fuel_gauge.c @@ -32,6 +32,12 @@ #include <linux/seq_file.h> #include <asm/unaligned.h> +#define PS_STAT_VBUS_TRIGGER (1 << 0) +#define PS_STAT_BAT_CHRG_DIR (1 << 2) +#define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3) +#define PS_STAT_VBUS_VALID (1 << 4) +#define PS_STAT_VBUS_PRESENT (1 << 5) + #define CHRG_STAT_BAT_SAFE_MODE (1 << 3) #define CHRG_STAT_BAT_VALID (1 << 4) #define CHRG_STAT_BAT_PRESENT (1 << 5) @@ -336,8 +342,7 @@ static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) static void fuel_gauge_get_status(struct axp288_fg_info *info) { - int pwr_stat, ret; - int charge, discharge; + int pwr_stat, fg_res; pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); if (pwr_stat < 0) { @@ -345,29 +350,25 @@ static void fuel_gauge_get_status(struct axp288_fg_info *info) "PWR STAT read failed:%d\n", pwr_stat); return; } - ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &charge); - if (ret < 0) { - dev_err(&info->pdev->dev, - "ADC charge current read failed:%d\n", ret); - return; - } - ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge); - if (ret < 0) { - dev_err(&info->pdev->dev, - "ADC discharge current read failed:%d\n", ret); - return; + + /* Report full if Vbus is valid and the reported capacity is 100% */ + if (pwr_stat & PS_STAT_VBUS_VALID) { + fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES); + if (fg_res < 0) { + dev_err(&info->pdev->dev, + "FG RES read failed: %d\n", fg_res); + return; + } + if (fg_res == (FG_REP_CAP_VALID | 100)) { + info->status = POWER_SUPPLY_STATUS_FULL; + return; + } } - if (charge > 0) + if (pwr_stat & PS_STAT_BAT_CHRG_DIR) info->status = POWER_SUPPLY_STATUS_CHARGING; - else if (discharge > 0) + else info->status = POWER_SUPPLY_STATUS_DISCHARGING; - else { - if (pwr_stat & CHRG_STAT_BAT_PRESENT) - info->status = POWER_SUPPLY_STATUS_FULL; - else - info->status = POWER_SUPPLY_STATUS_NOT_CHARGING; - } } static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt) |