bq27x00_battery: Report -ENODATA if bq27000 battery was not calibrated

* CI (Capacity Inaccurate) flag is set after full reset on bq27000 battery
* when is set, all capacity properties should be reported incorrectly,
  because there was no learning cycle and battery was not calibrated
* instead reporting incorrect values, report -ENODATA

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index a5311225b964..6c8dfdb169a1 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -56,6 +56,7 @@
 #define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
 #define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
 #define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
+#define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
 #define BQ27000_FLAG_FC                 BIT(5)
 #define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
 
@@ -265,12 +266,20 @@ static void bq27x00_update(struct bq27x00_device_info *di)
 
         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
         if (cache.flags >= 0) {
-                cache.capacity = bq27x00_battery_read_rsoc(di);
+                if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) {
+                        cache.capacity = -ENODATA;
+                        cache.time_to_empty = -ENODATA;
+                        cache.time_to_empty_avg = -ENODATA;
+                        cache.time_to_full = -ENODATA;
+                        cache.charge_full = -ENODATA;
+                } else {
+                        cache.capacity = bq27x00_battery_read_rsoc(di);
+                        cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
+                        cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
+                        cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
+                        cache.charge_full = bq27x00_battery_read_lmd(di);
+                }
                 cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
-                cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
-                cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
-                cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
-                cache.charge_full = bq27x00_battery_read_lmd(di);
                 cache.cycle_count = bq27x00_battery_read_cyct(di);
 
                 /* We only have to read charge design full once */