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linux-next/drivers/power/bq27xxx_battery.c
Sebastian Reichel 41a90db8fd power: bq27xxx_battery: move irq handler to i2c section 
The IRQ handler is not used by the platform based
code resulting in a 'defined but not used' warning,
if CONFIG_BQ27XXX_I2C is not enabled.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Pali Rohár <pali.rohar@gmail.com>
Acked-by: Andrew F. Davis <afd@ti.com>
2015-10-19 10:38:03 +02:00

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/*
* BQ27xxx battery driver
*
* Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
* Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
* Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
* Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
*
* Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
*
* 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.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Datasheets:
* http://www.ti.com/product/bq27000
* http://www.ti.com/product/bq27200
* http://www.ti.com/product/bq27010
* http://www.ti.com/product/bq27210
* http://www.ti.com/product/bq27500
* http://www.ti.com/product/bq27510-g3
* http://www.ti.com/product/bq27520-g4
* http://www.ti.com/product/bq27530-g1
* http://www.ti.com/product/bq27531-g1
* http://www.ti.com/product/bq27541-g1
* http://www.ti.com/product/bq27542-g1
* http://www.ti.com/product/bq27546-g1
* http://www.ti.com/product/bq27742-g1
* http://www.ti.com/product/bq27545-g1
* http://www.ti.com/product/bq27421-g1
* http://www.ti.com/product/bq27425-g1
* http://www.ti.com/product/bq27411-g1
* http://www.ti.com/product/bq27621-g1
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/idr.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <asm/unaligned.h>
#include <linux/power/bq27xxx_battery.h>
#define DRIVER_VERSION "1.2.0"
#define BQ27XXX_MANUFACTURER "Texas Instruments"
/* BQ27XXX Flags */
#define BQ27XXX_FLAG_DSC BIT(0)
#define BQ27XXX_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
#define BQ27XXX_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
#define BQ27XXX_FLAG_FC BIT(9)
#define BQ27XXX_FLAG_OTD BIT(14)
#define BQ27XXX_FLAG_OTC BIT(15)
#define BQ27XXX_FLAG_UT BIT(14)
#define BQ27XXX_FLAG_OT BIT(15)
/* BQ27000 has different layout for Flags register */
#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
#define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
#define BQ27000_FLAG_FC BIT(5)
#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
#define BQ27XXX_RS (20) /* Resistor sense mOhm */
#define BQ27XXX_POWER_CONSTANT (29200) /* 29.2 µV^2 * 1000 */
#define BQ27XXX_CURRENT_CONSTANT (3570) /* 3.57 µV * 1000 */
struct bq27xxx_device_info;
struct bq27xxx_access_methods {
int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
};
#define INVALID_REG_ADDR 0xff
/*
* bq27xxx_reg_index - Register names
*
* These are indexes into a device's register mapping array.
*/
enum bq27xxx_reg_index {
BQ27XXX_REG_CTRL = 0, /* Control */
BQ27XXX_REG_TEMP, /* Temperature */
BQ27XXX_REG_INT_TEMP, /* Internal Temperature */
BQ27XXX_REG_VOLT, /* Voltage */
BQ27XXX_REG_AI, /* Average Current */
BQ27XXX_REG_FLAGS, /* Flags */
BQ27XXX_REG_TTE, /* Time-to-Empty */
BQ27XXX_REG_TTF, /* Time-to-Full */
BQ27XXX_REG_TTES, /* Time-to-Empty Standby */
BQ27XXX_REG_TTECP, /* Time-to-Empty at Constant Power */
BQ27XXX_REG_NAC, /* Nominal Available Capacity */
BQ27XXX_REG_FCC, /* Full Charge Capacity */
BQ27XXX_REG_CYCT, /* Cycle Count */
BQ27XXX_REG_AE, /* Available Energy */
BQ27XXX_REG_SOC, /* State-of-Charge */
BQ27XXX_REG_DCAP, /* Design Capacity */
BQ27XXX_REG_AP, /* Average Power */
};
struct bq27xxx_reg_cache {
int temperature;
int time_to_empty;
int time_to_empty_avg;
int time_to_full;
int charge_full;
int cycle_count;
int capacity;
int energy;
int flags;
int power_avg;
int health;
};
struct bq27xxx_device_info {
struct device *dev;
int id;
enum bq27xxx_chip chip;
struct bq27xxx_reg_cache cache;
int charge_design_full;
unsigned long last_update;
struct delayed_work work;
struct power_supply *bat;
struct bq27xxx_access_methods bus;
struct mutex lock;
u8 *regs;
};
/* Register mappings */
static u8 bq27000_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
INVALID_REG_ADDR, /* INT TEMP - NA*/
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0a, /* FLAGS */
0x16, /* TTE */
0x18, /* TTF */
0x1c, /* TTES */
0x26, /* TTECP */
0x0c, /* NAC */
0x12, /* LMD(FCC) */
0x2a, /* CYCT */
0x22, /* AE */
0x0b, /* SOC(RSOC) */
0x76, /* DCAP(ILMD) */
0x24, /* AP */
};
static u8 bq27010_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
INVALID_REG_ADDR, /* INT TEMP - NA*/
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0a, /* FLAGS */
0x16, /* TTE */
0x18, /* TTF */
0x1c, /* TTES */
0x26, /* TTECP */
0x0c, /* NAC */
0x12, /* LMD(FCC) */
0x2a, /* CYCT */
INVALID_REG_ADDR, /* AE - NA */
0x0b, /* SOC(RSOC) */
0x76, /* DCAP(ILMD) */
INVALID_REG_ADDR, /* AP - NA */
};
static u8 bq27500_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0x28, /* INT TEMP */
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0a, /* FLAGS */
0x16, /* TTE */
INVALID_REG_ADDR, /* TTF - NA */
0x1a, /* TTES */
INVALID_REG_ADDR, /* TTECP - NA */
0x0c, /* NAC */
0x12, /* LMD(FCC) */
0x1e, /* CYCT */
INVALID_REG_ADDR, /* AE - NA */
0x20, /* SOC(RSOC) */
0x2e, /* DCAP(ILMD) */
INVALID_REG_ADDR, /* AP - NA */
};
static u8 bq27530_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0x32, /* INT TEMP */
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0a, /* FLAGS */
0x16, /* TTE */
INVALID_REG_ADDR, /* TTF - NA */
INVALID_REG_ADDR, /* TTES - NA */
INVALID_REG_ADDR, /* TTECP - NA */
0x0c, /* NAC */
0x12, /* LMD(FCC) */
0x2a, /* CYCT */
INVALID_REG_ADDR, /* AE - NA */
0x2c, /* SOC(RSOC) */
INVALID_REG_ADDR, /* DCAP - NA */
0x24, /* AP */
};
static u8 bq27541_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0x28, /* INT TEMP */
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0a, /* FLAGS */
0x16, /* TTE */
INVALID_REG_ADDR, /* TTF - NA */
INVALID_REG_ADDR, /* TTES - NA */
INVALID_REG_ADDR, /* TTECP - NA */
0x0c, /* NAC */
0x12, /* LMD(FCC) */
0x2a, /* CYCT */
INVALID_REG_ADDR, /* AE - NA */
0x2c, /* SOC(RSOC) */
0x3c, /* DCAP */
0x76, /* AP */
};
static u8 bq27545_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0x28, /* INT TEMP */
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0a, /* FLAGS */
0x16, /* TTE */
INVALID_REG_ADDR, /* TTF - NA */
INVALID_REG_ADDR, /* TTES - NA */
INVALID_REG_ADDR, /* TTECP - NA */
0x0c, /* NAC */
0x12, /* LMD(FCC) */
0x2a, /* CYCT */
INVALID_REG_ADDR, /* AE - NA */
0x2c, /* SOC(RSOC) */
INVALID_REG_ADDR, /* DCAP - NA */
0x24, /* AP */
};
static u8 bq27421_regs[] = {
0x00, /* CONTROL */
0x02, /* TEMP */
0x1e, /* INT TEMP */
0x04, /* VOLT */
0x10, /* AVG CURR */
0x06, /* FLAGS */
INVALID_REG_ADDR, /* TTE - NA */
INVALID_REG_ADDR, /* TTF - NA */
INVALID_REG_ADDR, /* TTES - NA */
INVALID_REG_ADDR, /* TTECP - NA */
0x08, /* NAC */
0x0e, /* FCC */
INVALID_REG_ADDR, /* CYCT - NA */
INVALID_REG_ADDR, /* AE - NA */
0x1c, /* SOC */
0x3c, /* DCAP */
0x18, /* AP */
};
static u8 *bq27xxx_regs[] = {
[BQ27000] = bq27000_regs,
[BQ27010] = bq27010_regs,
[BQ27500] = bq27500_regs,
[BQ27530] = bq27530_regs,
[BQ27541] = bq27541_regs,
[BQ27545] = bq27545_regs,
[BQ27421] = bq27421_regs,
};
static enum power_supply_property bq27000_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_TIME_TO_EMPTY_NOW,
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_CYCLE_COUNT,
POWER_SUPPLY_PROP_ENERGY_NOW,
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static enum power_supply_property bq27010_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_TIME_TO_EMPTY_NOW,
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_CYCLE_COUNT,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static enum power_supply_property bq27500_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_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static enum power_supply_property bq27530_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_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static enum power_supply_property bq27541_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_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static enum power_supply_property bq27545_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_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CYCLE_COUNT,
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_MANUFACTURER,
};
static enum power_supply_property bq27421_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,
POWER_SUPPLY_PROP_MANUFACTURER,
};
#define BQ27XXX_PROP(_id, _prop) \
[_id] = { \
.props = _prop, \
.size = ARRAY_SIZE(_prop), \
}
static struct {
enum power_supply_property *props;
size_t size;
} bq27xxx_battery_props[] = {
BQ27XXX_PROP(BQ27000, bq27000_battery_props),
BQ27XXX_PROP(BQ27010, bq27010_battery_props),
BQ27XXX_PROP(BQ27500, bq27500_battery_props),
BQ27XXX_PROP(BQ27530, bq27530_battery_props),
BQ27XXX_PROP(BQ27541, bq27541_battery_props),
BQ27XXX_PROP(BQ27545, bq27545_battery_props),
BQ27XXX_PROP(BQ27421, bq27421_battery_props),
};
static unsigned int poll_interval = 360;
module_param(poll_interval, uint, 0644);
MODULE_PARM_DESC(poll_interval,
"battery poll interval in seconds - 0 disables polling");
/*
* Common code for BQ27xxx devices
*/
static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
bool single)
{
/* Reports EINVAL for invalid/missing registers */
if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
return -EINVAL;
return di->bus.read(di, di->regs[reg_index], single);
}
/*
* Return the battery State-of-Charge
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
{
int soc;
soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
if (soc < 0)
dev_dbg(di->dev, "error reading State-of-Charge\n");
return soc;
}
/*
* Return a battery charge value in µAh
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
{
int charge;
charge = bq27xxx_read(di, reg, false);
if (charge < 0) {
dev_dbg(di->dev, "error reading charge register %02x: %d\n",
reg, charge);
return charge;
}
if (di->chip == BQ27000 || di->chip == BQ27010)
charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
else
charge *= 1000;
return charge;
}
/*
* Return the battery Nominal available capacity in µAh
* Or < 0 if something fails.
*/
static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
{
int flags;
if (di->chip == BQ27000 || di->chip == BQ27010) {
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
if (flags >= 0 && (flags & BQ27000_FLAG_CI))
return -ENODATA;
}
return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
}
/*
* Return the battery Full Charge Capacity in µAh
* Or < 0 if something fails.
*/
static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
{
return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
}
/*
* Return the Design Capacity in µAh
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
{
int dcap;
dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
if (dcap < 0) {
dev_dbg(di->dev, "error reading initial last measured discharge\n");
return dcap;
}
if (di->chip == BQ27000 || di->chip == BQ27010)
dcap *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
else
dcap *= 1000;
return dcap;
}
/*
* Return the battery Available energy in µWh
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
{
int ae;
ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
if (ae < 0) {
dev_dbg(di->dev, "error reading available energy\n");
return ae;
}
if (di->chip == BQ27000 || di->chip == BQ27010)
ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
else
ae *= 1000;
return ae;
}
/*
* Return the battery temperature in tenths of degree Kelvin
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
{
int temp;
temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
if (temp < 0) {
dev_err(di->dev, "error reading temperature\n");
return temp;
}
if (di->chip == BQ27000 || di->chip == BQ27010)
temp = 5 * temp / 2;
return temp;
}
/*
* Return the battery Cycle count total
* Or < 0 if something fails.
*/
static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
{
int cyct;
cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
if (cyct < 0)
dev_err(di->dev, "error reading cycle count total\n");
return cyct;
}
/*
* Read a time register.
* Return < 0 if something fails.
*/
static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
{
int tval;
tval = bq27xxx_read(di, reg, false);
if (tval < 0) {
dev_dbg(di->dev, "error reading time register %02x: %d\n",
reg, tval);
return tval;
}
if (tval == 65535)
return -ENODATA;
return tval * 60;
}
/*
* Read an average power register.
* Return < 0 if something fails.
*/
static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
{
int tval;
tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
if (tval < 0) {
dev_err(di->dev, "error reading average power register %02x: %d\n",
BQ27XXX_REG_AP, tval);
return tval;
}
if (di->chip == BQ27000 || di->chip == BQ27010)
return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
else
return tval;
}
/*
* Returns true if a battery over temperature condition is detected
*/
static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
{
if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
if (di->chip == BQ27530 || di->chip == BQ27421)
return flags & BQ27XXX_FLAG_OT;
return false;
}
/*
* Returns true if a battery under temperature condition is detected
*/
static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
{
if (di->chip == BQ27530 || di->chip == BQ27421)
return flags & BQ27XXX_FLAG_UT;
return false;
}
/*
* Returns true if a low state of charge condition is detected
*/
static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
{
if (di->chip == BQ27000 || di->chip == BQ27010)
return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
else
return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
}
/*
* Read flag register.
* Return < 0 if something fails.
*/
static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
{
int flags;
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
if (flags < 0) {
dev_err(di->dev, "error reading flag register:%d\n", flags);
return flags;
}
/* Unlikely but important to return first */
if (unlikely(bq27xxx_battery_overtemp(di, flags)))
return POWER_SUPPLY_HEALTH_OVERHEAT;
if (unlikely(bq27xxx_battery_undertemp(di, flags)))
return POWER_SUPPLY_HEALTH_COLD;
if (unlikely(bq27xxx_battery_dead(di, flags)))
return POWER_SUPPLY_HEALTH_DEAD;
return POWER_SUPPLY_HEALTH_GOOD;
}
static void bq27xxx_battery_update(struct bq27xxx_device_info *di)
{
struct bq27xxx_reg_cache cache = {0, };
bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
if ((cache.flags & 0xff) == 0xff)
cache.flags = -1; /* read error */
if (cache.flags >= 0) {
cache.temperature = bq27xxx_battery_read_temperature(di);
if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
cache.capacity = -ENODATA;
cache.energy = -ENODATA;
cache.time_to_empty = -ENODATA;
cache.time_to_empty_avg = -ENODATA;
cache.time_to_full = -ENODATA;
cache.charge_full = -ENODATA;
cache.health = -ENODATA;
} else {
if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
cache.charge_full = bq27xxx_battery_read_fcc(di);
cache.capacity = bq27xxx_battery_read_soc(di);
if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
cache.energy = bq27xxx_battery_read_energy(di);
cache.health = bq27xxx_battery_read_health(di);
}
if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
cache.cycle_count = bq27xxx_battery_read_cyct(di);
if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
/* We only have to read charge design full once */
if (di->charge_design_full <= 0)
di->charge_design_full = bq27xxx_battery_read_dcap(di);
}
if (di->cache.capacity != cache.capacity)
power_supply_changed(di->bat);
if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
di->cache = cache;
di->last_update = jiffies;
}
static void bq27xxx_battery_poll(struct work_struct *work)
{
struct bq27xxx_device_info *di =
container_of(work, struct bq27xxx_device_info,
work.work);
bq27xxx_battery_update(di);
if (poll_interval > 0) {
/* The timer does not have to be accurate. */
set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
schedule_delayed_work(&di->work, poll_interval * HZ);
}
}
/*
* Return the battery average current in µA
* Note that current can be negative signed as well
* Or 0 if something fails.
*/
static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
union power_supply_propval *val)
{
int curr;
int flags;
curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
if (curr < 0) {
dev_err(di->dev, "error reading current\n");
return curr;
}
if (di->chip == BQ27000 || di->chip == BQ27010) {
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
if (flags & BQ27000_FLAG_CHGS) {
dev_dbg(di->dev, "negative current!\n");
curr = -curr;
}
val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
} else {
/* Other gauges return signed value */
val->intval = (int)((s16)curr) * 1000;
}
return 0;
}
static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
union power_supply_propval *val)
{
int status;
if (di->chip == BQ27000 || di->chip == BQ27010) {
if (di->cache.flags & BQ27000_FLAG_FC)
status = POWER_SUPPLY_STATUS_FULL;
else if (di->cache.flags & BQ27000_FLAG_CHGS)
status = POWER_SUPPLY_STATUS_CHARGING;
else if (power_supply_am_i_supplied(di->bat))
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
else
status = POWER_SUPPLY_STATUS_DISCHARGING;
} else {
if (di->cache.flags & BQ27XXX_FLAG_FC)
status = POWER_SUPPLY_STATUS_FULL;
else if (di->cache.flags & BQ27XXX_FLAG_DSC)
status = POWER_SUPPLY_STATUS_DISCHARGING;
else
status = POWER_SUPPLY_STATUS_CHARGING;
}
val->intval = status;
return 0;
}
static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
union power_supply_propval *val)
{
int level;
if (di->chip == BQ27000 || di->chip == BQ27010) {
if (di->cache.flags & BQ27000_FLAG_FC)
level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
else if (di->cache.flags & BQ27000_FLAG_EDV1)
level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
else if (di->cache.flags & BQ27000_FLAG_EDVF)
level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
else
level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
} else {
if (di->cache.flags & BQ27XXX_FLAG_FC)
level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
else
level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
}
val->intval = level;
return 0;
}
/*
* Return the battery Voltage in millivolts
* Or < 0 if something fails.
*/
static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
union power_supply_propval *val)
{
int volt;
volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
if (volt < 0) {
dev_err(di->dev, "error reading voltage\n");
return volt;
}
val->intval = volt * 1000;
return 0;
}
static int bq27xxx_simple_value(int value,
union power_supply_propval *val)
{
if (value < 0)
return value;
val->intval = value;
return 0;
}
static int bq27xxx_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ret = 0;
struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
mutex_lock(&di->lock);
if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
cancel_delayed_work_sync(&di->work);
bq27xxx_battery_poll(&di->work.work);
}
mutex_unlock(&di->lock);
if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
return -ENODEV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
ret = bq27xxx_battery_status(di, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = bq27xxx_battery_voltage(di, val);
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = di->cache.flags < 0 ? 0 : 1;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = bq27xxx_battery_current(di, val);
break;
case POWER_SUPPLY_PROP_CAPACITY:
ret = bq27xxx_simple_value(di->cache.capacity, val);
break;
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
ret = bq27xxx_battery_capacity_level(di, val);
break;
case POWER_SUPPLY_PROP_TEMP:
ret = bq27xxx_simple_value(di->cache.temperature, val);
if (ret == 0)
val->intval -= 2731; /* convert decidegree k to c */
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
break;
case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
ret = bq27xxx_simple_value(di->cache.time_to_full, val);
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
ret = bq27xxx_simple_value(di->cache.charge_full, val);
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
ret = bq27xxx_simple_value(di->charge_design_full, val);
break;
case POWER_SUPPLY_PROP_CYCLE_COUNT:
ret = bq27xxx_simple_value(di->cache.cycle_count, val);
break;
case POWER_SUPPLY_PROP_ENERGY_NOW:
ret = bq27xxx_simple_value(di->cache.energy, val);
break;
case POWER_SUPPLY_PROP_POWER_AVG:
ret = bq27xxx_simple_value(di->cache.power_avg, val);
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = bq27xxx_simple_value(di->cache.health, val);
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = BQ27XXX_MANUFACTURER;
break;
default:
return -EINVAL;
}
return ret;
}
static void bq27xxx_external_power_changed(struct power_supply *psy)
{
struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
cancel_delayed_work_sync(&di->work);
schedule_delayed_work(&di->work, 0);
}
static int bq27xxx_powersupply_init(struct bq27xxx_device_info *di,
const char *name)
{
int ret;
struct power_supply_desc *psy_desc;
struct power_supply_config psy_cfg = { .drv_data = di, };
psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
if (!psy_desc)
return -ENOMEM;
psy_desc->name = name;
psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
psy_desc->properties = bq27xxx_battery_props[di->chip].props;
psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
psy_desc->get_property = bq27xxx_battery_get_property;
psy_desc->external_power_changed = bq27xxx_external_power_changed;
INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
mutex_init(&di->lock);
di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
if (IS_ERR(di->bat)) {
ret = PTR_ERR(di->bat);
dev_err(di->dev, "failed to register battery: %d\n", ret);
return ret;
}
dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
bq27xxx_battery_update(di);
return 0;
}
static void bq27xxx_powersupply_unregister(struct bq27xxx_device_info *di)
{
/*
* power_supply_unregister call bq27xxx_battery_get_property which
* call bq27xxx_battery_poll.
* Make sure that bq27xxx_battery_poll will not call
* schedule_delayed_work again after unregister (which cause OOPS).
*/
poll_interval = 0;
cancel_delayed_work_sync(&di->work);
power_supply_unregister(di->bat);
mutex_destroy(&di->lock);
}
/* i2c specific code */
#ifdef CONFIG_BATTERY_BQ27XXX_I2C
/* If the system has several batteries we need a different name for each
* of them...
*/
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);
static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
{
struct bq27xxx_device_info *di = data;
bq27xxx_battery_update(di);
return IRQ_HANDLED;
}
static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
bool single)
{
struct i2c_client *client = to_i2c_client(di->dev);
struct i2c_msg msg[2];
unsigned char data[2];
int ret;
if (!client->adapter)
return -ENODEV;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].buf = &reg;
msg[0].len = sizeof(reg);
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].buf = data;
if (single)
msg[1].len = 1;
else
msg[1].len = 2;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret < 0)
return ret;
if (!single)
ret = get_unaligned_le16(data);
else
ret = data[0];
return ret;
}
static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
char *name;
struct bq27xxx_device_info *di;
int num;
int retval = 0;
/* Get new ID for the new battery device */
mutex_lock(&battery_mutex);
num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
mutex_unlock(&battery_mutex);
if (num < 0)
return num;
name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
if (!name) {
retval = -ENOMEM;
goto batt_failed;
}
di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
if (!di) {
retval = -ENOMEM;
goto batt_failed;
}
di->id = num;
di->dev = &client->dev;
di->chip = id->driver_data;
di->bus.read = &bq27xxx_battery_i2c_read;
di->regs = bq27xxx_regs[di->chip];
retval = bq27xxx_powersupply_init(di, name);
if (retval)
goto batt_failed;
/* Schedule a polling after about 1 min */
schedule_delayed_work(&di->work, 60 * HZ);
i2c_set_clientdata(client, di);
if (client->irq) {
retval = devm_request_threaded_irq(&client->dev, client->irq,
NULL, bq27xxx_battery_irq_handler_thread,
IRQF_ONESHOT,
name, di);
if (retval) {
dev_err(&client->dev,
"Unable to register IRQ %d error %d\n",
client->irq, retval);
return retval;
}
}
return 0;
batt_failed:
mutex_lock(&battery_mutex);
idr_remove(&battery_id, num);
mutex_unlock(&battery_mutex);
return retval;
}
static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
{
struct bq27xxx_device_info *di = i2c_get_clientdata(client);
bq27xxx_powersupply_unregister(di);
mutex_lock(&battery_mutex);
idr_remove(&battery_id, di->id);
mutex_unlock(&battery_mutex);
return 0;
}
static const struct i2c_device_id bq27xxx_id[] = {
{ "bq27200", BQ27000 },
{ "bq27210", BQ27010 },
{ "bq27500", BQ27500 },
{ "bq27510", BQ27500 },
{ "bq27520", BQ27500 },
{ "bq27530", BQ27530 },
{ "bq27531", BQ27530 },
{ "bq27541", BQ27541 },
{ "bq27542", BQ27541 },
{ "bq27546", BQ27541 },
{ "bq27742", BQ27541 },
{ "bq27545", BQ27545 },
{ "bq27421", BQ27421 },
{ "bq27425", BQ27421 },
{ "bq27441", BQ27421 },
{ "bq27621", BQ27421 },
{},
};
MODULE_DEVICE_TABLE(i2c, bq27xxx_id);
static struct i2c_driver bq27xxx_battery_i2c_driver = {
.driver = {
.name = "bq27xxx-battery",
},
.probe = bq27xxx_battery_i2c_probe,
.remove = bq27xxx_battery_i2c_remove,
.id_table = bq27xxx_id,
};
static inline int bq27xxx_battery_i2c_init(void)
{
int ret = i2c_add_driver(&bq27xxx_battery_i2c_driver);
if (ret)
pr_err("Unable to register BQ27xxx i2c driver\n");
return ret;
}
static inline void bq27xxx_battery_i2c_exit(void)
{
i2c_del_driver(&bq27xxx_battery_i2c_driver);
}
#else
static inline int bq27xxx_battery_i2c_init(void) { return 0; }
static inline void bq27xxx_battery_i2c_exit(void) {};
#endif
/* platform specific code */
#ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
bool single)
{
struct device *dev = di->dev;
struct bq27xxx_platform_data *pdata = dev->platform_data;
unsigned int timeout = 3;
int upper, lower;
int temp;
if (!single) {
/* Make sure the value has not changed in between reading the
* lower and the upper part */
upper = pdata->read(dev, reg + 1);
do {
temp = upper;
if (upper < 0)
return upper;
lower = pdata->read(dev, reg);
if (lower < 0)
return lower;
upper = pdata->read(dev, reg + 1);
} while (temp != upper && --timeout);
if (timeout == 0)
return -EIO;
return (upper << 8) | lower;
}
return pdata->read(dev, reg);
}
static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
{
struct bq27xxx_device_info *di;
struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
const char *name;
if (!pdata) {
dev_err(&pdev->dev, "no platform_data supplied\n");
return -EINVAL;
}
if (!pdata->read) {
dev_err(&pdev->dev, "no hdq read callback supplied\n");
return -EINVAL;
}
if (!pdata->chip) {
dev_err(&pdev->dev, "no device supplied\n");
return -EINVAL;
}
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
if (!di)
return -ENOMEM;
platform_set_drvdata(pdev, di);
di->dev = &pdev->dev;
di->chip = pdata->chip;
di->regs = bq27xxx_regs[di->chip];
name = pdata->name ?: dev_name(&pdev->dev);
di->bus.read = &bq27xxx_battery_platform_read;
return bq27xxx_powersupply_init(di, name);
}
static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
{
struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
bq27xxx_powersupply_unregister(di);
return 0;
}
static struct platform_driver bq27xxx_battery_platform_driver = {
.probe = bq27xxx_battery_platform_probe,
.remove = bq27xxx_battery_platform_remove,
.driver = {
.name = "bq27000-battery",
},
};
static inline int bq27xxx_battery_platform_init(void)
{
int ret = platform_driver_register(&bq27xxx_battery_platform_driver);
if (ret)
pr_err("Unable to register BQ27xxx platform driver\n");
return ret;
}
static inline void bq27xxx_battery_platform_exit(void)
{
platform_driver_unregister(&bq27xxx_battery_platform_driver);
}
#else
static inline int bq27xxx_battery_platform_init(void) { return 0; }
static inline void bq27xxx_battery_platform_exit(void) {};
#endif
/*
* Module stuff
*/
static int __init bq27xxx_battery_init(void)
{
int ret;
ret = bq27xxx_battery_i2c_init();
if (ret)
return ret;
ret = bq27xxx_battery_platform_init();
if (ret)
bq27xxx_battery_i2c_exit();
return ret;
}
module_init(bq27xxx_battery_init);
static void __exit bq27xxx_battery_exit(void)
{
bq27xxx_battery_platform_exit();
bq27xxx_battery_i2c_exit();
}
module_exit(bq27xxx_battery_exit);
#ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
MODULE_ALIAS("platform:bq27000-battery");
#endif
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
MODULE_LICENSE("GPL");
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