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power: supply: max17042_battery: Route MAX17055 SOC alerts through dSOCi

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Use MAX17055 dSOCi for ordinary 1% state-of-charge notifications and leave SALRT configured for the critical low-battery threshold instead of reprogramming the SALRT window on every alert.

Signed-off-by: Vincent Cloutier <vincent@cloutier.co>
Link: https://patch.msgid.link/20260406205759.493288-5-vincent.cloutier@icloud.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Vincent Cloutier
2026-04-06 16:57:52 -04:00
committed by Sebastian Reichel
parent 0a733cd247
commit 6649d933f5
1 changed files with 36 additions and 3 deletions
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39
drivers/power/supply/max17042_battery.c
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@@ -27,6 +27,7 @@
/* Status register bits */
#define STATUS_POR_BIT (1 << 1)
#define STATUS_BST_BIT (1 << 3)
#define STATUS_DSOCI_BIT (1 << 7)
#define STATUS_VMN_BIT (1 << 8)
#define STATUS_TMN_BIT (1 << 9)
#define STATUS_SMN_BIT (1 << 10)
@@ -38,6 +39,7 @@
/* Interrupt mask bits */
#define CFG_ALRT_BIT_ENBL (1 << 2)
#define CFG2_DSOCI_BIT_ENBL (1 << 7)
#define VFSOC0_LOCK 0x0000
#define VFSOC0_UNLOCK 0x0080
@@ -52,6 +54,8 @@
#define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
#define MAX17042_CRITICAL_SOC 0x03
#define MAX17042_CURRENT_LSB 1562500ll /* 1.5625µV/Rsense */
#define MAX17042_CAPACITY_LSB 5000000ll /* 5.0µVH/Rsense */
#define MAX17042_TIME_LSB 5625 / 1000 /* s */
@@ -903,6 +907,34 @@ static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
regmap_write(map, MAX17042_SALRT_Th, soc_tr);
}
static void max17042_set_critical_soc_threshold(struct max17042_chip *chip)
{
struct regmap *map = chip->regmap;
u32 soc;
if (chip->pdata->enable_current_sense)
regmap_read(map, MAX17042_RepSOC, &soc);
else
regmap_read(map, MAX17042_VFSOC, &soc);
regmap_write(map, MAX17042_SALRT_Th,
((soc >> 8) >= MAX17042_CRITICAL_SOC) ?
0xff00 + MAX17042_CRITICAL_SOC : 0xff00);
}
static void max17042_enable_soc_alerts(struct max17042_chip *chip)
{
if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055) {
regmap_update_bits(chip->regmap, MAX17055_Config2,
CFG2_DSOCI_BIT_ENBL,
CFG2_DSOCI_BIT_ENBL);
max17042_set_critical_soc_threshold(chip);
return;
}
max17042_set_soc_threshold(chip, 1);
}
static irqreturn_t max17042_thread_handler(int id, void *dev)
{
struct max17042_chip *chip = dev;
@@ -913,9 +945,10 @@ static irqreturn_t max17042_thread_handler(int id, void *dev)
if (ret)
return IRQ_HANDLED;
if ((val & STATUS_SMN_BIT) || (val & STATUS_SMX_BIT)) {
if ((val & STATUS_SMN_BIT) || (val & STATUS_SMX_BIT) ||
(val & STATUS_DSOCI_BIT)) {
dev_dbg(chip->dev, "SOC threshold INTR\n");
max17042_set_soc_threshold(chip, 1);
max17042_enable_soc_alerts(chip);
}
/* we implicitly handle all alerts via power_supply_changed */
@@ -1201,7 +1234,7 @@ static int max17042_probe(struct i2c_client *client, struct device *dev, int irq
regmap_update_bits(chip->regmap, MAX17042_CONFIG,
CFG_ALRT_BIT_ENBL,
CFG_ALRT_BIT_ENBL);
max17042_set_soc_threshold(chip, 1);
max17042_enable_soc_alerts(chip);
} else {
irq = 0;
if (ret != -EBUSY)