[PATCHv1 13/19] power: supply: sbs-battery: add POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED support

[Sebastian Reichel]

Add support for reporting the SBS battery's condition flag
to userspace using the new "Calibration required" health status.

Signed-off-by: Sebastian Reichel <sebastian.reic...@collabora.com>
---
 drivers/power/supply/sbs-battery.c | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/sbs-battery.c 
b/drivers/power/supply/sbs-battery.c
index 4fa553d61db2..2a2b926ad75c 100644
--- a/drivers/power/supply/sbs-battery.c
+++ b/drivers/power/supply/sbs-battery.c
@@ -23,6 +23,7 @@
 
 enum {
        REG_MANUFACTURER_DATA,
+       REG_BATTERY_MODE,
        REG_TEMPERATURE,
        REG_VOLTAGE,
        REG_CURRENT_NOW,
@@ -94,6 +95,8 @@ static const struct chip_data {
 } sbs_data[] = {
        [REG_MANUFACTURER_DATA] =
                SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
+       [REG_BATTERY_MODE] =
+               SBS_DATA(-1, 0x03, 0, 65535),
        [REG_TEMPERATURE] =
                SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
        [REG_VOLTAGE] =
@@ -366,6 +369,17 @@ static int sbs_status_correct(struct i2c_client *client, 
int *intval)
        return 0;
 }
 
+static bool sbs_bat_needs_calibration(struct i2c_client *client)
+{
+       int ret;
+
+       ret = sbs_read_word_data(client, sbs_data[REG_BATTERY_MODE].addr);
+       if (ret < 0)
+               return false;
+
+       return !!(ret & BIT(7));
+}
+
 static int sbs_get_battery_presence_and_health(
        struct i2c_client *client, enum power_supply_property psp,
        union power_supply_propval *val)
@@ -385,9 +399,14 @@ static int sbs_get_battery_presence_and_health(
 
        if (psp == POWER_SUPPLY_PROP_PRESENT)
                val->intval = 1; /* battery present */
-       else /* POWER_SUPPLY_PROP_HEALTH */
-               /* SBS spec doesn't have a general health command. */
-               val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+       else { /* POWER_SUPPLY_PROP_HEALTH */
+               if (sbs_bat_needs_calibration(client)) {
+                       val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
+               } else {
+                       /* SBS spec doesn't have a general health command. */
+                       val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+               }
+       }
 
        return 0;
 }
@@ -441,6 +460,8 @@ static int sbs_get_ti_battery_presence_and_health(
                        val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
                else if (ret == 0x0C)
                        val->intval = POWER_SUPPLY_HEALTH_DEAD;
+               else if (sbs_bat_needs_calibration(client))
+                       val->intval = POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED;
                else
                        val->intval = POWER_SUPPLY_HEALTH_GOOD;
        }
-- 
2.26.2