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authorSyed Rafiuddin <srafiuddin@nvidia.com>2012-05-17 12:51:15 +0530
committerAnton Vorontsov <cbouatmailru@gmail.com>2012-06-19 19:28:24 -0700
commit9903e62700a122a366ad4c9be8f8f97115cf9a68 (patch)
treee07f46d86c938a1e8f4b5e2abe59342806e1c821 /drivers/power
parent5da50988a1bf8c05611db77521777baaca14da29 (diff)
downloadlinux-9903e62700a122a366ad4c9be8f8f97115cf9a68.tar.bz2
bq27x00_battery: Add support for power average and health properties
Addition of power average and health properties. Signed-off-by: Syed Rafiuddin <srafiuddin@nvidia.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/bq27x00_battery.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index f5d6d379f2fb..5657990b7ace 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -51,6 +51,7 @@
#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
#define BQ27x00_REG_AE 0x22 /* Available energy */
+#define BQ27x00_POWER_AVG 0x24
#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
@@ -66,8 +67,10 @@
#define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
#define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
#define BQ27500_FLAG_FC BIT(9)
+#define BQ27500_FLAG_OTC BIT(15)
#define BQ27000_RS 20 /* Resistor sense */
+#define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
struct bq27x00_device_info;
struct bq27x00_access_methods {
@@ -86,6 +89,8 @@ struct bq27x00_reg_cache {
int capacity;
int energy;
int flags;
+ int power_avg;
+ int health;
};
struct bq27x00_device_info {
@@ -123,6 +128,8 @@ static enum power_supply_property bq27x00_battery_props[] = {
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_ENERGY_NOW,
+ POWER_SUPPLY_PROP_POWER_AVG,
+ POWER_SUPPLY_PROP_HEALTH,
};
static unsigned int poll_interval = 360;
@@ -306,6 +313,60 @@ static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
return tval * 60;
}
+/*
+ * Read a power avg register.
+ * Return < 0 if something fails.
+ */
+static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
+{
+ int tval;
+
+ tval = bq27x00_read(di, reg, false);
+ if (tval < 0) {
+ dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
+ reg, tval);
+ return tval;
+ }
+
+ if (di->chip == BQ27500)
+ return tval;
+ else
+ return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
+}
+
+/*
+ * Read flag register.
+ * Return < 0 if something fails.
+ */
+static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
+{
+ int tval;
+
+ tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
+ if (tval < 0) {
+ dev_err(di->dev, "error reading flag register:%d\n", tval);
+ return tval;
+ }
+
+ if ((di->chip == BQ27500)) {
+ if (tval & BQ27500_FLAG_SOCF)
+ tval = POWER_SUPPLY_HEALTH_DEAD;
+ else if (tval & BQ27500_FLAG_OTC)
+ tval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else
+ tval = POWER_SUPPLY_HEALTH_GOOD;
+ return tval;
+ } else {
+ if (tval & BQ27000_FLAG_EDV1)
+ tval = POWER_SUPPLY_HEALTH_DEAD;
+ else
+ tval = POWER_SUPPLY_HEALTH_GOOD;
+ return tval;
+ }
+
+ return -1;
+}
+
static void bq27x00_update(struct bq27x00_device_info *di)
{
struct bq27x00_reg_cache cache = {0, };
@@ -321,6 +382,7 @@ static void bq27x00_update(struct bq27x00_device_info *di)
cache.time_to_empty_avg = -ENODATA;
cache.time_to_full = -ENODATA;
cache.charge_full = -ENODATA;
+ cache.health = -ENODATA;
} else {
cache.capacity = bq27x00_battery_read_rsoc(di);
cache.energy = bq27x00_battery_read_energy(di);
@@ -328,9 +390,12 @@ static void bq27x00_update(struct bq27x00_device_info *di)
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.health = bq27x00_battery_read_health(di);
}
cache.temperature = bq27x00_battery_read_temperature(di);
cache.cycle_count = bq27x00_battery_read_cyct(di);
+ cache.power_avg =
+ bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
/* We only have to read charge design full once */
if (di->charge_design_full <= 0)
@@ -550,6 +615,12 @@ static int bq27x00_battery_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_ENERGY_NOW:
ret = bq27x00_simple_value(di->cache.energy, val);
break;
+ case POWER_SUPPLY_PROP_POWER_AVG:
+ ret = bq27x00_simple_value(di->cache.power_avg, val);
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = bq27x00_simple_value(di->cache.health, val);
+ break;
default:
return -EINVAL;
}