bq27x00: Add new properties

This patch add support for reporting properties
POWER_SUPPLY_PROP_CHARGE_NOW, POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_COUNTER, POWER_SUPPLY_PROP_ENERGY_NOW in
module bq27x00_battery.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Grazvydas Ignotas <notasas@gmail.com>

1 files changed, 151 insertions, 1 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 25350fcbadb3..a1bd1ff753b3 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -16,6 +16,13 @@
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
  */
+
+/*
+ * Datasheets:
+ * http://focus.ti.com/docs/prod/folders/print/bq27000.html
+ * http://focus.ti.com/docs/prod/folders/print/bq27500.html
+ */
+
 #include <linux/module.h>
 #include <linux/param.h>
 #include <linux/jiffies.h>
@@ -30,7 +37,7 @@
 
 #include <linux/power/bq27x00_battery.h>
 
-#define DRIVER_VERSION                  "1.1.0"
+#define DRIVER_VERSION                  "1.2.0"
 
 #define BQ27x00_REG_TEMP                0x06
 #define BQ27x00_REG_VOLT                0x08
@@ -39,11 +46,17 @@
 #define BQ27x00_REG_TTE                 0x16
 #define BQ27x00_REG_TTF                 0x18
 #define BQ27x00_REG_TTECP               0x26
+#define BQ27x00_REG_NAC                 0x0C /* Nominal available capaciy */
+#define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
+#define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
+#define BQ27x00_REG_AE                  0x22 /* Available enery */
 
 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
+#define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
 #define BQ27000_FLAG_CHGS               BIT(7)
 
 #define BQ27500_REG_SOC                 0x2c
+#define BQ27500_REG_DCAP                0x3C /* Design capacity */
 #define BQ27500_FLAG_DSC                BIT(0)
 #define BQ27500_FLAG_FC                 BIT(9)
 
@@ -61,6 +74,8 @@ struct bq27x00_reg_cache {
         int time_to_empty;
         int time_to_empty_avg;
         int time_to_full;
+        int charge_full;
+        int charge_counter;
         int capacity;
         int flags;
 
@@ -73,6 +88,8 @@ struct bq27x00_device_info {
         enum bq27x00_chip       chip;
 
         struct bq27x00_reg_cache cache;
+        int charge_design_full;
+
         unsigned long last_update;
         struct delayed_work work;
 
@@ -94,6 +111,11 @@ static enum power_supply_property bq27x00_battery_props[] = {
         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
         POWER_SUPPLY_PROP_TECHNOLOGY,
+        POWER_SUPPLY_PROP_CHARGE_FULL,
+        POWER_SUPPLY_PROP_CHARGE_NOW,
+        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+        POWER_SUPPLY_PROP_CHARGE_COUNTER,
+        POWER_SUPPLY_PROP_ENERGY_NOW,
 };
 
 static unsigned int poll_interval = 360;
@@ -131,6 +153,87 @@ static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 }
 
 /*
+ * Return a battery charge value in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
+{
+        int charge;
+
+        charge = bq27x00_read(di, reg, false);
+        if (charge < 0) {
+                dev_err(di->dev, "error reading nominal available capacity\n");
+                return charge;
+        }
+
+        if (di->chip == BQ27500)
+                charge *= 1000;
+        else
+                charge = charge * 3570 / BQ27000_RS;
+
+        return charge;
+}
+
+/*
+ * Return the battery Nominal available capaciy in µAh
+ * Or < 0 if something fails.
+ */
+static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
+{
+        return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
+}
+
+/*
+ * Return the battery Last measured discharge in µAh
+ * Or < 0 if something fails.
+ */
+static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
+{
+        return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
+}
+
+/*
+ * Return the battery Initial last measured discharge in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
+{
+        int ilmd;
+
+        if (di->chip == BQ27500)
+                ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
+        else
+                ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
+
+        if (ilmd < 0) {
+                dev_err(di->dev, "error reading initial last measured discharge\n");
+                return ilmd;
+        }
+
+        if (di->chip == BQ27500)
+                ilmd *= 1000;
+        else
+                ilmd = ilmd * 256 * 3570 / BQ27000_RS;
+
+        return ilmd;
+}
+
+/*
+ * Return the battery Cycle count total
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
+{
+        int cyct;
+
+        cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
+        if (cyct < 0)
+                dev_err(di->dev, "error reading cycle count total\n");
+
+        return cyct;
+}
+
+/*
  * Read a time register.
  * Return < 0 if something fails.
  */
@@ -162,9 +265,15 @@ static void bq27x00_update(struct bq27x00_device_info *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.charge_counter = bq27x00_battery_read_cyct(di);
 
                 if (!is_bq27500)
                         cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);
+
+                /* We only have to read charge design full once */
+                if (di->charge_design_full <= 0)
+                        di->charge_design_full = bq27x00_battery_read_ilmd(di);
         }
 
         /* Ignore current_now which is a snapshot of the current battery state
@@ -285,6 +394,32 @@ static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
         return 0;
 }
 
+/*
+ * Return the battery Available energy in µWh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_energy(struct bq27x00_device_info *di,
+        union power_supply_propval *val)
+{
+        int ae;
+
+        ae = bq27x00_read(di, BQ27x00_REG_AE, false);
+        if (ae < 0) {
+                dev_err(di->dev, "error reading available energy\n");
+                return ae;
+        }
+
+        if (di->chip == BQ27500)
+                ae *= 1000;
+        else
+                ae = ae * 29200 / BQ27000_RS;
+
+        val->intval = ae;
+
+        return 0;
+}
+
+
 static int bq27x00_simple_value(int value,
         union power_supply_propval *val)
 {
@@ -347,6 +482,21 @@ static int bq27x00_battery_get_property(struct power_supply *psy,
         case POWER_SUPPLY_PROP_TECHNOLOGY:
                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
                 break;
+        case POWER_SUPPLY_PROP_CHARGE_NOW:
+                ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
+                break;
+        case POWER_SUPPLY_PROP_CHARGE_FULL:
+                ret = bq27x00_simple_value(di->cache.charge_full, val);
+                break;
+        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+                ret = bq27x00_simple_value(di->charge_design_full, val);
+                break;
+        case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+                ret = bq27x00_simple_value(di->cache.charge_counter, val);
+                break;
+        case POWER_SUPPLY_PROP_ENERGY_NOW:
+                ret = bq27x00_battery_energy(di, val);
+                break;
         default:
                 return -EINVAL;
         }