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Subject[PATCH 09/14] POWER: bq27x00: Add new properties
Date
From: Pali Rohár <pali.rohar@gmail.com>

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>
---
drivers/power/bq27x00_battery.c | 158 ++++++++++++++++++++++++++++++++++++++-
1 files changed, 156 insertions(+), 2 deletions(-)
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 0dc7771..49affd6 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)

@@ -61,11 +74,15 @@ 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;

int voltage;
+ int charge_now;
int current_now;
+ int energy_now;
};

struct bq27x00_device_info {
@@ -74,6 +91,8 @@ 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;

@@ -93,6 +112,11 @@ 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;
@@ -145,6 +169,113 @@ static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
}

/*
+ * Return the battery Nominal available capaciy in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
+{
+ int nac;
+
+ nac = bq27x00_read(di, BQ27x00_REG_NAC, false);
+ if (nac < 0) {
+ dev_err(di->dev, "error reading nominal available capacity\n");
+ return nac;
+ }
+
+ if (di->chip == BQ27500)
+ nac *= 1000;
+ else
+ nac = nac * 3570 / BQ27000_RS;
+
+ return nac;
+}
+
+/*
+ * Return the battery Last measured discharge in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
+{
+ int lmd;
+
+ lmd = bq27x00_read(di, BQ27x00_REG_LMD, false);
+ if (lmd < 0) {
+ dev_err(di->dev, "error reading last measured discharge\n");
+ return lmd;
+ }
+
+ if (di->chip == BQ27500)
+ lmd *= 1000;
+ else
+ lmd = lmd * 3570 / BQ27000_RS;
+
+ return 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;
+}
+
+/*
+ * Return the battery Available energy in µWh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
+{
+ 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;
+
+ return ae;
+}
+
+/*
* Read a time register.
* Return < 0 if something fails.
*/
@@ -178,11 +309,19 @@ 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_now = bq27x00_battery_read_nac(di);
+ cache.charge_full = bq27x00_battery_read_lmd(di);
+ cache.charge_counter = bq27x00_battery_read_cyct(di);
+ cache.energy_now = bq27x00_battery_read_energy(di);
+
+ /* 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 those values which are snapshots of the current battery state
* and are likely to be different even between two consecutive reads */
- if (memcmp(&di->cache, &cache, sizeof(cache) - 2*sizeof(int)) != 0) {
+ if (memcmp(&di->cache, &cache, sizeof(cache) - 4*sizeof(int)) != 0) {
di->cache = cache;
power_supply_changed(&di->bat);
}
@@ -325,6 +464,21 @@ 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(di->cache.charge_now, 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_simple_value(di->cache.energy_now, val);
+ break;
default:
return -EINVAL;
}
--
1.7.2.3
--
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