power: ds2781: Report age scalar to system

Because the battery is non-removable, the service centers would like
a way of knowing whether the battery actually needs replacing. The
driver will now report the age scalar to the system to indicate
battery age.

Change-Id: I4dcaf12d87fdf82563d5511702ee3c6b4dffeecb
Signed-off-by: Greg Meiste <w30289@motorola.com>

diff --git a/drivers/power/ds2781_battery.c b/drivers/power/ds2781_battery.c
index 940a940991bdad953054c138ddcc22835e7f837f..848bfc88b3ca4dc3c3308cb64f6b1a4bc49e2d7e 100644 (file)
--- a/drivers/power/ds2781_battery.c
+++ b/drivers/power/ds2781_battery.c
@@ -50,6 +50,7 @@ struct battery_status {
        u16 temp_C;             /* units of 0.1 C */
 
        u8 percentage;          /* battery percentage */
+       u8 age_scalar;          /* converted to percent */
        u8 charge_source;
        u8 status_reg;
        u8 battery_full;        /* battery full (don't charge) */
@@ -142,6 +143,7 @@ static enum power_supply_property battery_properties[] = {
        POWER_SUPPLY_PROP_HEALTH,
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_TECHNOLOGY,
+       POWER_SUPPLY_PROP_CYCLE_COUNT,
        POWER_SUPPLY_PROP_CAPACITY,
        POWER_SUPPLY_PROP_VOLTAGE_NOW,
        POWER_SUPPLY_PROP_TEMP,
@@ -190,6 +192,10 @@ static void ds2781_parse_data(u8 *raw, struct battery_status *s)
        /* RAAC is in units of 1.6mAh */
        s->charge_uAh = ((raw[DS2781_REG_RAAC_MSB] << 8) |
                          raw[DS2781_REG_RAAC_LSB]) * 1600;
+
+       /* Get Age: Unit=0.78125%, range is 49.2% to 100% */
+       n = raw[DS2781_REG_AGE_SCALAR];
+       s->age_scalar = (n * 78125) / 100000;
 }
 
 static int ds2781_battery_read_status(struct ds2781_device_info *di)
@@ -205,7 +211,7 @@ static int ds2781_battery_read_status(struct ds2781_device_info *di)
                count = DS2781_DATA_SIZE - start;
        } else {
                start = DS2781_REG_STATUS;
-               count = DS2781_REG_CURR_LSB - start + 1;
+               count = DS2781_REG_AGE_SCALAR - start + 1;
        }
 
        ret = w1_ds2781_read(di->w1_dev, di->raw + start, start, count);
@@ -263,6 +269,9 @@ static int battery_get_property(struct power_supply *psy,
        case POWER_SUPPLY_PROP_TECHNOLOGY:
                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
                break;
+       case POWER_SUPPLY_PROP_CYCLE_COUNT:
+               val->intval = di->status.age_scalar;
+               break;
        case POWER_SUPPLY_PROP_CAPACITY:
                if (di->status.battery_full)
                        val->intval = 100;