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path: root/drivers/power/max17042_battery.c
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Diffstat (limited to 'drivers/power/max17042_battery.c')
-rw-r--r--drivers/power/max17042_battery.c175
1 files changed, 105 insertions, 70 deletions
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index c5c8805156c..98bfab35b8e 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -29,74 +29,6 @@
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
-enum max17042_register {
- MAX17042_STATUS = 0x00,
- MAX17042_VALRT_Th = 0x01,
- MAX17042_TALRT_Th = 0x02,
- MAX17042_SALRT_Th = 0x03,
- MAX17042_AtRate = 0x04,
- MAX17042_RepCap = 0x05,
- MAX17042_RepSOC = 0x06,
- MAX17042_Age = 0x07,
- MAX17042_TEMP = 0x08,
- MAX17042_VCELL = 0x09,
- MAX17042_Current = 0x0A,
- MAX17042_AvgCurrent = 0x0B,
- MAX17042_Qresidual = 0x0C,
- MAX17042_SOC = 0x0D,
- MAX17042_AvSOC = 0x0E,
- MAX17042_RemCap = 0x0F,
- MAX17402_FullCAP = 0x10,
- MAX17042_TTE = 0x11,
- MAX17042_V_empty = 0x12,
-
- MAX17042_RSLOW = 0x14,
-
- MAX17042_AvgTA = 0x16,
- MAX17042_Cycles = 0x17,
- MAX17042_DesignCap = 0x18,
- MAX17042_AvgVCELL = 0x19,
- MAX17042_MinMaxTemp = 0x1A,
- MAX17042_MinMaxVolt = 0x1B,
- MAX17042_MinMaxCurr = 0x1C,
- MAX17042_CONFIG = 0x1D,
- MAX17042_ICHGTerm = 0x1E,
- MAX17042_AvCap = 0x1F,
- MAX17042_ManName = 0x20,
- MAX17042_DevName = 0x21,
- MAX17042_DevChem = 0x22,
-
- MAX17042_TempNom = 0x24,
- MAX17042_TempCold = 0x25,
- MAX17042_TempHot = 0x26,
- MAX17042_AIN = 0x27,
- MAX17042_LearnCFG = 0x28,
- MAX17042_SHFTCFG = 0x29,
- MAX17042_RelaxCFG = 0x2A,
- MAX17042_MiscCFG = 0x2B,
- MAX17042_TGAIN = 0x2C,
- MAx17042_TOFF = 0x2D,
- MAX17042_CGAIN = 0x2E,
- MAX17042_COFF = 0x2F,
-
- MAX17042_Q_empty = 0x33,
- MAX17042_T_empty = 0x34,
-
- MAX17042_RCOMP0 = 0x38,
- MAX17042_TempCo = 0x39,
- MAX17042_Rx = 0x3A,
- MAX17042_T_empty0 = 0x3B,
- MAX17042_TaskPeriod = 0x3C,
- MAX17042_FSTAT = 0x3D,
-
- MAX17042_SHDNTIMER = 0x3F,
-
- MAX17042_VFRemCap = 0x4A,
-
- MAX17042_QH = 0x4D,
- MAX17042_QL = 0x4E,
-};
-
struct max17042_chip {
struct i2c_client *client;
struct power_supply battery;
@@ -123,10 +55,27 @@ static int max17042_read_reg(struct i2c_client *client, u8 reg)
return ret;
}
+static void max17042_set_reg(struct i2c_client *client,
+ struct max17042_reg_data *data, int size)
+{
+ int i;
+
+ for (i = 0; i < size; i++)
+ max17042_write_reg(client, data[i].addr, data[i].data);
+}
+
static enum power_supply_property max17042_battery_props[] = {
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
};
static int max17042_get_property(struct power_supply *psy,
@@ -137,6 +86,30 @@ static int max17042_get_property(struct power_supply *psy,
struct max17042_chip, battery);
switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_STATUS);
+ if (val->intval & MAX17042_STATUS_BattAbsent)
+ val->intval = 0;
+ else
+ val->intval = 1;
+ break;
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_Cycles);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_MinMaxVolt);
+ val->intval >>= 8;
+ val->intval *= 20000; /* Units of LSB = 20mV */
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_V_empty);
+ val->intval >>= 7;
+ val->intval *= 10000; /* Units of LSB = 10mV */
+ break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = max17042_read_reg(chip->client,
MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */
@@ -149,6 +122,57 @@ static int max17042_get_property(struct power_supply *psy,
val->intval = max17042_read_reg(chip->client,
MAX17042_SOC) / 256;
break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_RepSOC);
+ if ((val->intval / 256) >= MAX17042_BATTERY_FULL)
+ val->intval = 1;
+ else if (val->intval >= 0)
+ val->intval = 0;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_TEMP);
+ /* The value is signed. */
+ if (val->intval & 0x8000) {
+ val->intval = (0x7fff & ~val->intval) + 1;
+ val->intval *= -1;
+ }
+ /* The value is converted into deci-centigrade scale */
+ /* Units of LSB = 1 / 256 degree Celsius */
+ val->intval = val->intval * 10 / 256;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ if (chip->pdata->enable_current_sense) {
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_Current);
+ if (val->intval & 0x8000) {
+ /* Negative */
+ val->intval = ~val->intval & 0x7fff;
+ val->intval++;
+ val->intval *= -1;
+ }
+ val->intval >>= 4;
+ val->intval *= 1000000 * 25 / chip->pdata->r_sns;
+ } else {
+ return -EINVAL;
+ }
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ if (chip->pdata->enable_current_sense) {
+ val->intval = max17042_read_reg(chip->client,
+ MAX17042_AvgCurrent);
+ if (val->intval & 0x8000) {
+ /* Negative */
+ val->intval = ~val->intval & 0x7fff;
+ val->intval++;
+ val->intval *= -1;
+ }
+ val->intval *= 1562500 / chip->pdata->r_sns;
+ } else {
+ return -EINVAL;
+ }
+ break;
default:
return -EINVAL;
}
@@ -180,18 +204,30 @@ static int __devinit max17042_probe(struct i2c_client *client,
chip->battery.properties = max17042_battery_props;
chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
+ /* When current is not measured,
+ * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
+ if (!chip->pdata->enable_current_sense)
+ chip->battery.num_properties -= 2;
+
ret = power_supply_register(&client->dev, &chip->battery);
if (ret) {
dev_err(&client->dev, "failed: power supply register\n");
- i2c_set_clientdata(client, NULL);
kfree(chip);
return ret;
}
+ /* Initialize registers according to values from the platform data */
+ if (chip->pdata->init_data)
+ max17042_set_reg(client, chip->pdata->init_data,
+ chip->pdata->num_init_data);
+
if (!chip->pdata->enable_current_sense) {
max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
+ } else {
+ if (chip->pdata->r_sns == 0)
+ chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
}
return 0;
@@ -202,7 +238,6 @@ static int __devexit max17042_remove(struct i2c_client *client)
struct max17042_chip *chip = i2c_get_clientdata(client);
power_supply_unregister(&chip->battery);
- i2c_set_clientdata(client, NULL);
kfree(chip);
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 17:50:42 +0000