bq27x00_battery: Add support for BQ27425 chip

[deliverable/linux.git] / drivers / power / bq27x00_battery.c

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 5657990b7aceea102733e7d42fb88ce1436fa4f2..181ddece5181afceb5d025fbdcf9bfb7f641f007 100644 (file)
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -22,6 +22,7 @@
  * Datasheets:
  * http://focus.ti.com/docs/prod/folders/print/bq27000.html
  * http://focus.ti.com/docs/prod/folders/print/bq27500.html
+ * http://www.ti.com/product/bq27425-g1
  */
 
 #include <linux/module.h>
@@ -69,6 +70,10 @@
 #define BQ27500_FLAG_FC                        BIT(9)
 #define BQ27500_FLAG_OTC               BIT(15)
 
+/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
+#define BQ27425_REG_OFFSET             0x04
+#define BQ27425_REG_SOC                        0x18 /* Register address plus offset */
+
 #define BQ27000_RS                     20 /* Resistor sense */
 #define BQ27x00_POWER_CONSTANT         (256 * 29200 / 1000)
 
@@ -77,7 +82,7 @@ struct bq27x00_access_methods {
        int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
 };
 
-enum bq27x00_chip { BQ27000, BQ27500 };
+enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
 
 struct bq27x00_reg_cache {
        int temperature;
@@ -132,6 +137,20 @@ static enum power_supply_property bq27x00_battery_props[] = {
        POWER_SUPPLY_PROP_HEALTH,
 };
 
+static enum power_supply_property bq27425_battery_props[] = {
+       POWER_SUPPLY_PROP_STATUS,
+       POWER_SUPPLY_PROP_PRESENT,
+       POWER_SUPPLY_PROP_VOLTAGE_NOW,
+       POWER_SUPPLY_PROP_CURRENT_NOW,
+       POWER_SUPPLY_PROP_CAPACITY,
+       POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+       POWER_SUPPLY_PROP_TEMP,
+       POWER_SUPPLY_PROP_TECHNOLOGY,
+       POWER_SUPPLY_PROP_CHARGE_FULL,
+       POWER_SUPPLY_PROP_CHARGE_NOW,
+       POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+};
+
 static unsigned int poll_interval = 360;
 module_param(poll_interval, uint, 0644);
 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
@@ -144,9 +163,23 @@ MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
                bool single)
 {
+       if (di->chip == BQ27425)
+               return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
        return di->bus.read(di, reg, single);
 }
 
+/*
+ * Higher versions of the chip like BQ27425 and BQ27500
+ * differ from BQ27000 and BQ27200 in calculation of certain
+ * parameters. Hence we need to check for the chip type.
+ */
+static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
+{
+       if (di->chip == BQ27425 || di->chip == BQ27500)
+               return true;
+       return false;
+}
+
 /*
  * Return the battery Relative State-of-Charge
  * Or < 0 if something fails.
@@ -157,6 +190,8 @@ static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 
        if (di->chip == BQ27500)
                rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
+       else if (di->chip == BQ27425)
+               rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
        else
                rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
 
@@ -181,7 +216,7 @@ static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
                return charge;
        }
 
-       if (di->chip == BQ27500)
+       if (bq27xxx_is_chip_version_higher(di))
                charge *= 1000;
        else
                charge = charge * 3570 / BQ27000_RS;
@@ -215,7 +250,7 @@ static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 {
        int ilmd;
 
-       if (di->chip == BQ27500)
+       if (bq27xxx_is_chip_version_higher(di))
                ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
        else
                ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
@@ -225,7 +260,7 @@ static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
                return ilmd;
        }
 
-       if (di->chip == BQ27500)
+       if (bq27xxx_is_chip_version_higher(di))
                ilmd *= 1000;
        else
                ilmd = ilmd * 256 * 3570 / BQ27000_RS;
@@ -269,7 +304,7 @@ static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
                return temp;
        }
 
-       if (di->chip == BQ27500)
+       if (bq27xxx_is_chip_version_higher(di))
                temp -= 2731;
        else
                temp = ((temp * 5) - 5463) / 2;
@@ -371,10 +406,12 @@ static void bq27x00_update(struct bq27x00_device_info *di)
 {
        struct bq27x00_reg_cache cache = {0, };
        bool is_bq27500 = di->chip == BQ27500;
+       bool is_bq27425 = di->chip == BQ27425;
 
        cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
        if (cache.flags >= 0) {
-               if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) {
+               if (!is_bq27500 && !is_bq27425
+                               && (cache.flags & BQ27000_FLAG_CI)) {
                        dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
                        cache.capacity = -ENODATA;
                        cache.energy = -ENODATA;
@@ -385,14 +422,24 @@ static void bq27x00_update(struct bq27x00_device_info *di)
                        cache.health = -ENODATA;
                } else {
                        cache.capacity = bq27x00_battery_read_rsoc(di);
-                       cache.energy = bq27x00_battery_read_energy(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);
+                       if (!is_bq27425) {
+                               cache.energy = bq27x00_battery_read_energy(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.health = bq27x00_battery_read_health(di);
                }
                cache.temperature = bq27x00_battery_read_temperature(di);
+               if (!is_bq27425)
+                       cache.cycle_count = bq27x00_battery_read_cyct(di);
                cache.cycle_count = bq27x00_battery_read_cyct(di);
                cache.power_avg =
                        bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
@@ -441,7 +488,7 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di,
                return curr;
        }
 
-       if (di->chip == BQ27500) {
+       if (bq27xxx_is_chip_version_higher(di)) {
                /* bq27500 returns signed value */
                val->intval = (int)((s16)curr) * 1000;
        } else {
@@ -462,7 +509,7 @@ static int bq27x00_battery_status(struct bq27x00_device_info *di,
 {
        int status;
 
-       if (di->chip == BQ27500) {
+       if (bq27xxx_is_chip_version_higher(di)) {
                if (di->cache.flags & BQ27500_FLAG_FC)
                        status = POWER_SUPPLY_STATUS_FULL;
                else if (di->cache.flags & BQ27500_FLAG_DSC)
@@ -490,7 +537,7 @@ static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 {
        int level;
 
-       if (di->chip == BQ27500) {
+       if (bq27xxx_is_chip_version_higher(di)) {
                if (di->cache.flags & BQ27500_FLAG_FC)
                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
                else if (di->cache.flags & BQ27500_FLAG_SOC1)
@@ -641,8 +688,14 @@ static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
        int ret;
 
        di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
-       di->bat.properties = bq27x00_battery_props;
-       di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
+       di->chip = BQ27425;
+       if (di->chip == BQ27425) {
+               di->bat.properties = bq27425_battery_props;
+               di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
+       } else {
+               di->bat.properties = bq27x00_battery_props;
+               di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
+       }
        di->bat.get_property = bq27x00_battery_get_property;
        di->bat.external_power_changed = bq27x00_external_power_changed;
 
@@ -800,6 +853,7 @@ static int bq27x00_battery_remove(struct i2c_client *client)
 static const struct i2c_device_id bq27x00_id[] = {
        { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
        { "bq27500", BQ27500 },
+       { "bq27425", BQ27425 },
        {},
 };
 MODULE_DEVICE_TABLE(i2c, bq27x00_id);