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Date: Tue, 25 Jan 2011 19:07:15 +0100
From: Pali Rohár <pali.rohar@...il.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH] bq27x00_battery
This patch add support for properties POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL, POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_ONLINE in module bq27x00_battery. It also fix
reporting correct (devided by resistor sense) values on
bq27000/bq27200 batteries.
Signed-off-by: Pali Rohár <pali.rohar@...il.com>
Tested-by: Pali Rohár <pali.rohar@...il.com>
--- a/drivers/power/bq27x00_battery.c 2011-01-22 14:06:48.000000000 +0100
+++ b/drivers/power/bq27x00_battery.c 2011-01-23 04:06:04.000000000 +0100
@@ -3,9 +3,14 @@
*
* Copyright (C) 2008 Rodolfo Giometti <giometti@...ux.it>
* Copyright (C) 2008 Eurotech S.p.A. <info@...otech.it>
+ * Copyright (C) 2011 Pali Rohár <pali.rohar@...il.com>
*
* Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
*
+ * Datasheets:
+ * http://focus.ti.com/docs/prod/folders/print/bq27000.html
+ * http://focus.ti.com/docs/prod/folders/print/bq27500.html
+ *
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
@@ -27,8 +32,9 @@
#include <linux/slab.h>
#include <asm/unaligned.h>
-#define DRIVER_VERSION "1.1.0"
+#define DRIVER_VERSION "1.2.0"
+#define BQ27x00_REG_MODE 0x00
#define BQ27x00_REG_TEMP 0x06
#define BQ27x00_REG_VOLT 0x08
#define BQ27x00_REG_AI 0x14
@@ -36,11 +42,16 @@
#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_AE 0x22 /* Available Enery */
+#define BQ27000_RS 20 /* Resistor sense */
#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
#define BQ27000_FLAG_CHGS BIT(7)
+#define BQ27000_FLAG_FC BIT(5)
-#define BQ27500_REG_SOC 0x2c
+#define BQ27500_REG_SOC 0x2C
#define BQ27500_FLAG_DSC BIT(0)
#define BQ27500_FLAG_FC BIT(9)
@@ -74,7 +85,11 @@ static enum power_supply_property bq27x0
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
@@ -91,6 +106,24 @@ static int bq27x00_read(u8 reg, int *rt_
}
/*
+ * Return the GPIO status (0 or 1)
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_gpio(struct bq27x00_device_info *di)
+{
+ int ret;
+ int gpio = 0;
+
+ ret = bq27x00_read(BQ27x00_REG_MODE, &gpio, 0, di);
+ if (ret) {
+ dev_err(di->dev, "error reading GPIO status\n");
+ return ret;
+ }
+
+ return (gpio & 0x40) >> 6;
+}
+
+/*
* Return the battery temperature in tenths of degree Celsius
* Or < 0 if something fails.
*/
@@ -112,7 +145,7 @@ static int bq27x00_battery_temperature(s
}
/*
- * Return the battery Voltage in milivolts
+ * Return the battery Voltage in µV
* Or < 0 if something fails.
*/
static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
@@ -130,7 +163,7 @@ static int bq27x00_battery_voltage(struc
}
/*
- * Return the battery average current
+ * Return the battery average current in µA
* Note that current can be negative signed as well
* Or 0 if something fails.
*/
@@ -149,6 +182,7 @@ static int bq27x00_battery_current(struc
if (di->chip == BQ27500) {
/* bq27500 returns signed value */
curr = (int)(s16)curr;
+ curr *= 1000;
} else {
ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
if (ret < 0) {
@@ -159,9 +193,10 @@ static int bq27x00_battery_current(struc
dev_dbg(di->dev, "negative current!\n");
curr = -curr;
}
+ curr = curr * 3570 / BQ27000_RS;
}
- return curr * 1000;
+ return curr;
}
/*
@@ -185,6 +220,75 @@ static int bq27x00_battery_rsoc(struct b
return rsoc;
}
+/*
+ * Return the battery Nominal available capaciy in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_nac(struct bq27x00_device_info *di)
+{
+ int ret;
+ int nac = 0;
+
+ ret = bq27x00_read(BQ27x00_REG_NAC, &nac, 0, di);
+ if (ret) {
+ dev_err(di->dev, "error reading nominal available capaciy\n");
+ return ret;
+ }
+
+ 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_lmd(struct bq27x00_device_info *di)
+{
+ int ret;
+ int lmd = 0;
+
+ ret = bq27x00_read(BQ27x00_REG_LMD, &lmd, 0, di);
+ if (ret) {
+ dev_err(di->dev, "error reading last measured discharge\n");
+ return ret;
+ }
+
+ if (di->chip == BQ27500)
+ lmd *= 1000;
+ else
+ lmd = lmd * 3570 / BQ27000_RS;
+
+ return lmd;
+}
+
+/*
+ * Return the battery Available energy in µWh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_energy(struct bq27x00_device_info *di)
+{
+ int ret;
+ int ae = 0;
+
+ ret = bq27x00_read(BQ27x00_REG_LMD, &ae, 0, di);
+ if (ret) {
+ dev_err(di->dev, "error reading available energy\n");
+ return ret;
+ }
+
+ if (di->chip == BQ27500)
+ ae *= 1000;
+ else
+ ae = ae * 29200 / BQ27000_RS;
+
+ return ae;
+}
+
static int bq27x00_battery_status(struct bq27x00_device_info *di,
union power_supply_propval *val)
{
@@ -206,7 +310,9 @@ static int bq27x00_battery_status(struct
else
status = POWER_SUPPLY_STATUS_CHARGING;
} else {
- if (flags & BQ27000_FLAG_CHGS)
+ if (flags & BQ27000_FLAG_FC)
+ status = POWER_SUPPLY_STATUS_FULL;
+ else if (flags & BQ27000_FLAG_CHGS)
status = POWER_SUPPLY_STATUS_CHARGING;
else
status = POWER_SUPPLY_STATUS_DISCHARGING;
@@ -233,7 +339,7 @@ static int bq27x00_battery_time(struct b
}
if (tval == 65535)
- return -ENODATA;
+ tval = 0;
val->intval = tval * 60;
return 0;
@@ -253,6 +359,9 @@ static int bq27x00_battery_get_property(
case POWER_SUPPLY_PROP_STATUS:
ret = bq27x00_battery_status(di, val);
break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = bq27x00_battery_gpio(di);
+ break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
case POWER_SUPPLY_PROP_PRESENT:
val->intval = bq27x00_battery_voltage(di);
@@ -265,6 +374,15 @@ static int bq27x00_battery_get_property(
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = bq27x00_battery_rsoc(di);
break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ val->intval = bq27x00_battery_nac(di);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ val->intval = bq27x00_battery_lmd(di);
+ break;
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ val->intval = bq27x00_battery_energy(di);
+ break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = bq27x00_battery_temperature(di);
break;
@@ -469,4 +587,7 @@ module_exit(bq27x00_battery_exit);
MODULE_AUTHOR("Rodolfo Giometti <giometti@...ux.it>");
MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
+MODULE_ALIAS("i2c:bq27000");
+MODULE_ALIAS("i2c:bq27200");
+MODULE_ALIAS("i2c:bq27500");
MODULE_LICENSE("GPL");
--
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