[PATCH] power_supply: MAX17042: Support additional properties
From: Donggeun Kim
Date: Mon Jun 27 2011 - 06:10:20 EST
This patch supports additional properties (PRESENT, CYCLE_COUNT,
VOLTAGE_MAX, VOLTAGE_MIN_DESIGN, CURRENT_NOW, CURRENT_AVG,
CHARGE_FULL, and TEMP).
Plus, initialization code for registers is added.
Signed-off-by: Donggeun Kim <dg77.kim@xxxxxxxxxxx>
Signed-off-by: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
Signed-off-by: KyungMin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/power/max17042_battery.c | 168 +++++++++++++++++++-------------
include/linux/power/max17042_battery.h | 91 +++++++++++++++++
2 files changed, 191 insertions(+), 68 deletions(-)
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index c5c8805..a44888f 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_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_TEMP,
};
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 */
@@ -145,10 +118,61 @@ static int max17042_get_property(struct power_supply *psy,
val->intval = max17042_read_reg(chip->client,
MAX17042_AvgVCELL) * 83;
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;
case POWER_SUPPLY_PROP_CAPACITY:
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;
default:
return -EINVAL;
}
@@ -188,10 +212,18 @@ static int __devinit max17042_probe(struct i2c_client *client,
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;
diff --git a/include/linux/power/max17042_battery.h b/include/linux/power/max17042_battery.h
index 7995deb..fe99211 100644
--- a/include/linux/power/max17042_battery.h
+++ b/include/linux/power/max17042_battery.h
@@ -23,8 +23,99 @@
#ifndef __MAX17042_BATTERY_H_
#define __MAX17042_BATTERY_H_
+#define MAX17042_STATUS_BattAbsent (1 << 3)
+#define MAX17042_BATTERY_FULL (100)
+#define MAX17042_DEFAULT_SNS_RESISTOR (10000)
+
+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,
+};
+
+/*
+ * used for setting a register to a desired value
+ * addr : address for a register
+ * data : setting value for the register
+ */
+struct max17042_reg_data {
+ u8 addr;
+ u16 data;
+};
+
struct max17042_platform_data {
+ struct max17042_reg_data *init_data;
+ int num_init_data; /* Number of enties in init_data array */
bool enable_current_sense;
+
+ /*
+ * R_sns in micro-ohms.
+ * default 10000 (if r_sns = 0) as it is the recommended value by
+ * the datasheet although it can be changed by board designers.
+ */
+ unsigned int r_sns;
};
#endif /* __MAX17042_BATTERY_H_ */
--
1.7.4.1
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