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bq27x00_battery.c
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bq27x00_battery.c
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/*
* BQ27x00 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://focus.ti.com/docs/prod/folders/print/bq27000.html
* http://focus.ti.com/docs/prod/folders/print/bq27500.html
* http://www.ti.com/product/bq27411-g1
* http://www.ti.com/product/bq27421-g1
* http://www.ti.com/product/bq27425-g1
* http://www.ti.com/product/bq27441-g1
*/
#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 <asm/unaligned.h>
#include <linux/power/bq27x00_battery.h>
#define DRIVER_VERSION "1.2.0"
#define INVALID_REG_ADDR 0xFF
enum bq27xxx_reg_index {
BQ27XXX_REG_CTRL = 0,
BQ27XXX_REG_TEMP,
BQ27XXX_REG_INT_TEMP,
BQ27XXX_REG_VOLT,
BQ27XXX_REG_AI,
BQ27XXX_REG_FLAGS,
BQ27XXX_REG_TTE,
BQ27XXX_REG_TTF,
BQ27XXX_REG_TTES,
BQ27XXX_REG_TTECP,
BQ27XXX_REG_NAC,
BQ27XXX_REG_FCC,
BQ27XXX_REG_CYCT,
BQ27XXX_REG_AE,
BQ27XXX_REG_SOC,
BQ27XXX_REG_DCAP,
BQ27XXX_POWER_AVG,
NUM_REGS
};
/* bq27500 registers */
static __initdata u8 bq27500_regs[NUM_REGS] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0xFF, /* 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 */
0x2C, /* SOC(RSOC) */
0x3C, /* DCAP(ILMD) */
0x24, /* AP */
};
/* bq27520 registers */
static __initdata u8 bq27520_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0xFF, /* INT TEMP - NA*/
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0A, /* FLAGS */
0x16, /* TTE */
0x18, /* TTF */
0x1c, /* TTES */
0x26, /* TTECP */
0x0C, /* NAC */
0x12, /* LMD */
0xFF, /* CYCT - NA */
0x22, /* AE */
0x2C, /* SOC(RSOC */
0xFF, /* DCAP(ILMD) - NA */
0x24, /* AP */
};
/* bq2753x registers */
static __initdata u8 bq2753x_regs[] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0xFF, /* INT TEMP - NA*/
0x08, /* VOLT */
0x14, /* AVG CURR */
0x0A, /* FLAGS */
0x16, /* TTE */
0xFF, /* TTF - NA */
0xFF, /* TTES - NA */
0xFF, /* TTECP - NA */
0x0C, /* NAC */
0x12, /* LMD(FCC) */
0x2A, /* CYCT */
0xFF, /* AE - NA */
0x2C, /* SOC(RSOC) */
0xFF, /* DCAP(ILMD) - NA */
0x24, /* AP */
};
/* bq27200 registers */
static __initdata u8 bq27200_regs[NUM_REGS] = {
0x00, /* CONTROL */
0x06, /* TEMP */
0xFF, /* 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 */
};
/* bq274xx registers */
static __initdata u8 bq274xx_regs[NUM_REGS] = {
0x00, /* CONTROL */
0x02, /* TEMP */
0x1e, /* INT TEMP */
0x04, /* VOLT */
0x10, /* AVG CURR */
0x06, /* FLAGS */
0xFF, /* TTE - NA */
0xFF, /* TTF - NA */
0xFF, /* TTES - NA */
0xFF, /* TTECP - NA */
0x08, /* NAC */
0x0E, /* FCC */
0xFF, /* CYCT - NA */
0xFF, /* AE - NA */
0x1C, /* SOC */
0x3C, /* DCAP - NA */
0x18, /* AP */
};
/* bq276xx registers - same as bq274xx except CYCT */
static __initdata u8 bq276xx_regs[NUM_REGS] = {
0x00, /* CONTROL */
0x02, /* TEMP */
0x1e, /* INT TEMP */
0x04, /* VOLT */
0x10, /* AVG CURR */
0x06, /* FLAGS */
0xFF, /* TTE - NA */
0xFF, /* TTF - NA */
0xFF, /* TTES - NA */
0xFF, /* TTECP - NA */
0x08, /* NAC */
0x0E, /* FCC */
0x22, /* CYCT */
0xFF, /* AE - NA */
0x1C, /* SOC */
0x3C, /* DCAP - NA */
0x18, /* AP */
};
/*
* SBS Commands for DF access - these are pretty standard
* So, no need to go in the command array
*/
#define BLOCK_DATA_CLASS 0x3E
#define DATA_BLOCK 0x3F
#define BLOCK_DATA 0x40
#define BLOCK_DATA_CHECKSUM 0x60
#define BLOCK_DATA_CONTROL 0x61
/* bq274xx/bq276xx specific command information */
#define BQ274XX_UNSEAL_KEY 0x80008000
#define BQ274XX_SOFT_RESET 0x43
#define BQ274XX_FLAG_ITPOR 0x20
#define BQ274XX_CTRL_STATUS_INITCOMP 0x80
#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)
/* BQ27000 has different layout for Flags register */
#define BQ27200_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
#define BQ27200_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
#define BQ27200_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
#define BQ27200_FLAG_FC BIT(5)
#define BQ27200_FLAG_CHGS BIT(7) /* Charge state flag */
#define BQ27200_RS 20 /* Resistor sense */
#define BQ27200_POWER_CONSTANT (256 * 29200 / 1000)
/* Subcommands of Control() */
#define CONTROL_STATUS_SUBCMD 0x0000
#define DEV_TYPE_SUBCMD 0x0001
#define FW_VER_SUBCMD 0x0002
#define DF_VER_SUBCMD 0x001F
#define RESET_SUBCMD 0x0041
#define SET_CFGUPDATE_SUBCMD 0x0013
#define SEAL_SUBCMD 0x0020
/* Location of SEAL enable bit in bq276xx DM */
#define BQ276XX_OP_CFG_B_SUBCLASS 64
#define BQ276XX_OP_CFG_B_OFFSET 2
#define BQ276XX_OP_CFG_B_DEF_SEAL_BIT (1 << 5)
struct bq27x00_device_info;
struct bq27x00_access_methods {
int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
int (*write)(struct bq27x00_device_info *di, u8 reg, int value,
bool single);
int (*blk_read)(struct bq27x00_device_info *di, u8 reg, u8 *data,
u8 sz);
int (*blk_write)(struct bq27x00_device_info *di, u8 reg, u8 *data,
u8 sz);
};
enum bq27x00_chip { BQ27200, BQ27500, BQ27520, BQ274XX, BQ276XX, BQ2753X};
struct bq27x00_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 dm_reg {
u8 subclass;
u8 offset;
u8 len;
u32 data;
};
struct bq27x00_device_info {
struct device *dev;
int id;
enum bq27x00_chip chip;
struct bq27x00_reg_cache cache;
int charge_design_full;
unsigned long last_update;
struct delayed_work work;
struct power_supply bat;
struct bq27x00_access_methods bus;
struct mutex lock;
int fw_ver;
int df_ver;
u8 regs[NUM_REGS];
struct dm_reg *dm_regs;
u16 dm_regs_count;
};
static __initdata enum power_supply_property bq27x00_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,
};
static __initdata enum power_supply_property bq27520_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_ENERGY_NOW,
POWER_SUPPLY_PROP_POWER_AVG,
POWER_SUPPLY_PROP_HEALTH,
};
static __initdata enum power_supply_property bq2753x_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,
};
static __initdata enum power_supply_property bq274xx_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,
};
static __initdata enum power_supply_property bq276xx_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_CYCLE_COUNT,
};
/*
* Ordering the parameters based on subclass and then offset will help in
* having fewer flash writes while updating.
* Customize these values and, if necessary, add more based on system needs.
*/
static struct dm_reg bq274xx_dm_regs[] = {
{82, 0, 2, 1000}, /* Qmax */
{82, 5, 1, 0x81}, /* Load Select */
{82, 10, 2, 1340}, /* Design Capacity */
{82, 12, 2, 3700}, /* Design Energy */
{82, 16, 2, 3250}, /* Terminate Voltage */
{82, 27, 2, 110}, /* Taper rate */
};
static struct dm_reg bq276xx_dm_regs[] = {
{64, 2, 1, 0x2C}, /* Op Config B */
{82, 0, 2, 1000}, /* Qmax */
{82, 2, 1, 0x81}, /* Load Select */
{82, 3, 2, 1340}, /* Design Capacity */
{82, 5, 2, 3700}, /* Design Energy */
{82, 9, 2, 3250}, /* Terminate Voltage */
{82, 20, 2, 110}, /* Taper rate */
};
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");
/*
* Forward Declarations
*/
static int read_dm_block(struct bq27x00_device_info *di, u8 subclass,
u8 offset, u8 *data);
/*
* Common code for BQ27x00 devices
*/
static inline int bq27xxx_read(struct bq27x00_device_info *di, int reg_index,
bool single)
{
int val;
/* Reports 0 for invalid/missing registers */
if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
return 0;
val = di->bus.read(di, di->regs[reg_index], single);
return val;
}
static inline int bq27xxx_write(struct bq27x00_device_info *di, int reg_index,
int value, bool single)
{
if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
return -1;
return di->bus.write(di, di->regs[reg_index], value, single);
}
static int control_cmd_wr(struct bq27x00_device_info *di, u16 cmd)
{
dev_dbg(di->dev, "%s: cmd - %04x\n", __func__, cmd);
return di->bus.write(di, BQ27XXX_REG_CTRL, cmd, false);
}
static int control_cmd_read(struct bq27x00_device_info *di, u16 cmd)
{
dev_dbg(di->dev, "%s: cmd - %04x\n", __func__, cmd);
di->bus.write(di, BQ27XXX_REG_CTRL, cmd, false);
msleep(5);
return di->bus.read(di, BQ27XXX_REG_CTRL, false);
}
/*
* It is assumed that the gauge is in unsealed mode when this function
* is called
*/
static int bq276xx_seal_enabled(struct bq27x00_device_info *di)
{
u8 buf[32];
u8 op_cfg_b;
if (!read_dm_block(di, BQ276XX_OP_CFG_B_SUBCLASS,
BQ276XX_OP_CFG_B_OFFSET, buf)) {
return 1; /* Err on the side of caution and try to seal */
}
op_cfg_b = buf[BQ276XX_OP_CFG_B_OFFSET & 0x1F];
if (op_cfg_b & BQ276XX_OP_CFG_B_DEF_SEAL_BIT)
return 1;
return 0;
}
#define SEAL_UNSEAL_POLLING_RETRY_LIMIT 1000
static inline int sealed(struct bq27x00_device_info *di)
{
return control_cmd_read(di, CONTROL_STATUS_SUBCMD) & (1 << 13);
}
static int unseal(struct bq27x00_device_info *di, u32 key)
{
int i = 0;
dev_dbg(di->dev, "%s: key - %08x\n", __func__, key);
if (!sealed(di))
goto out;
di->bus.write(di, BQ27XXX_REG_CTRL, key & 0xFFFF, false);
msleep(5);
di->bus.write(di, BQ27XXX_REG_CTRL, (key & 0xFFFF0000) >> 16, false);
msleep(5);
while (i < SEAL_UNSEAL_POLLING_RETRY_LIMIT) {
i++;
if (!sealed(di))
break;
msleep(10);
}
out:
if (i == SEAL_UNSEAL_POLLING_RETRY_LIMIT) {
dev_err(di->dev, "%s: failed\n", __func__);
return 0;
} else {
return 1;
}
}
static int seal(struct bq27x00_device_info *di)
{
int i = 0;
int is_sealed;
dev_dbg(di->dev, "%s:\n", __func__);
is_sealed = sealed(di);
if (is_sealed)
return is_sealed;
if (di->chip == BQ276XX && !bq276xx_seal_enabled(di)) {
dev_dbg(di->dev, "%s: sealing is not enabled\n", __func__);
return is_sealed;
}
di->bus.write(di, BQ27XXX_REG_CTRL, SEAL_SUBCMD, false);
while (i < SEAL_UNSEAL_POLLING_RETRY_LIMIT) {
i++;
is_sealed = sealed(di);
if (is_sealed)
break;
msleep(10);
}
if (!is_sealed)
dev_err(di->dev, "%s: failed\n", __func__);
return is_sealed;
}
#define CFG_UPDATE_POLLING_RETRY_LIMIT 50
static int enter_cfg_update_mode(struct bq27x00_device_info *di)
{
int i = 0;
u16 flags;
dev_dbg(di->dev, "%s:\n", __func__);
if (!unseal(di, BQ274XX_UNSEAL_KEY))
return 0;
control_cmd_wr(di, SET_CFGUPDATE_SUBCMD);
msleep(5);
while (i < CFG_UPDATE_POLLING_RETRY_LIMIT) {
i++;
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
if (flags & (1 << 4))
break;
msleep(100);
}
if (i == CFG_UPDATE_POLLING_RETRY_LIMIT) {
dev_err(di->dev, "%s: failed %04x\n", __func__, flags);
return 0;
}
return 1;
}
static int exit_cfg_update_mode(struct bq27x00_device_info *di)
{
int i = 0;
u16 flags;
dev_dbg(di->dev, "%s:\n", __func__);
control_cmd_wr(di, BQ274XX_SOFT_RESET);
while (i < CFG_UPDATE_POLLING_RETRY_LIMIT) {
i++;
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
if (!(flags & (1 << 4)))
break;
msleep(100);
}
if (i == CFG_UPDATE_POLLING_RETRY_LIMIT) {
dev_err(di->dev, "%s: failed %04x\n", __func__, flags);
return 0;
}
if (seal(di))
return 1;
else
return 0;
}
static u8 checksum(u8 *data)
{
u16 sum = 0;
int i;
for (i = 0; i < 32; i++)
sum += data[i];
sum &= 0xFF;
return 0xFF - sum;
}
#ifdef DEBUG
static void print_buf(const char *msg, u8 *buf)
{
int i;
printk("\nbq: %s buf: ", msg);
for (i = 0; i < 32; i++)
printk("%02x ", buf[i]);
printk("\n");
}
#else
#define print_buf(a, b)
#endif
static int update_dm_block(struct bq27x00_device_info *di, u8 subclass,
u8 offset, u8 *data)
{
u8 buf[32];
u8 cksum;
u8 blk_offset = offset >> 5;
dev_dbg(di->dev, "%s: subclass %d offset %d\n",
__func__, subclass, offset);
di->bus.write(di, BLOCK_DATA_CONTROL, 0, true);
msleep(5);
di->bus.write(di, BLOCK_DATA_CLASS, subclass, true);
msleep(5);
di->bus.write(di, DATA_BLOCK, blk_offset, true);
msleep(5);
di->bus.blk_write(di, BLOCK_DATA, data, 32);
msleep(5);
print_buf(__func__, data);
cksum = checksum(data);
di->bus.write(di, BLOCK_DATA_CHECKSUM, cksum, true);
msleep(5);
/* Read back and compare to make sure write is successful */
di->bus.write(di, DATA_BLOCK, blk_offset, true);
msleep(5);
di->bus.blk_read(di, BLOCK_DATA, buf, 32);
if (memcmp(data, buf, 32)) {
dev_err(di->dev, "%s: error updating subclass %d offset %d\n",
__func__, subclass, offset);
return 0;
} else {
return 1;
}
}
static int read_dm_block(struct bq27x00_device_info *di, u8 subclass,
u8 offset, u8 *data)
{
u8 cksum_calc, cksum;
u8 blk_offset = offset >> 5;
dev_dbg(di->dev, "%s: subclass %d offset %d\n",
__func__, subclass, offset);
di->bus.write(di, BLOCK_DATA_CONTROL, 0, true);
msleep(5);
di->bus.write(di, BLOCK_DATA_CLASS, subclass, true);
msleep(5);
di->bus.write(di, DATA_BLOCK, blk_offset, true);
msleep(5);
di->bus.blk_read(di, BLOCK_DATA, data, 32);
cksum_calc = checksum(data);
cksum = di->bus.read(di, BLOCK_DATA_CHECKSUM, true);
if (cksum != cksum_calc) {
dev_err(di->dev, "%s: error reading subclass %d offset %d\n",
__func__, subclass, offset);
return 0;
}
print_buf(__func__, data);
return 1;
}
/*
* Return the battery State-of-Charge
* Or < 0 if something fails.
*/
static int bq27x00_battery_read_soc(struct bq27x00_device_info *di)
{
int soc;
soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
if (soc < 0)
dev_dbg(di->dev, "error reading relative State-of-Charge\n");
return soc;
}
/*
* Return a battery charge value in µAh
* Or < 0 if something fails.
*/
static int bq27x00_battery_read_charge(struct bq27x00_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 == BQ27200)
charge = charge * 3570 / BQ27200_RS;
else
charge *= 1000;
return charge;
}
/*
* Return the battery Nominal available capaciy in µAh
* Or < 0 if something fails.
*/
static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
{
int flags;
if (di->chip == BQ27200) {
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
if (flags >= 0 && (flags & BQ27200_FLAG_CI))
return -ENODATA;
}
return bq27x00_battery_read_charge(di, BQ27XXX_REG_NAC);
}
/*
* Return the battery Last measured discharge in µAh
* Or < 0 if something fails.
*/
static inline int bq27x00_battery_read_fcc(struct bq27x00_device_info *di)
{
return bq27x00_battery_read_charge(di, BQ27XXX_REG_FCC);
}
/*
* Return the Design Capacity in µAh
* Or < 0 if something fails.
*/
static int bq27x00_battery_read_dcap(struct bq27x00_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 == BQ27200)
dcap = dcap * 256 * 3570 / BQ27200_RS;
else
dcap *= 1000;
return dcap;
}
/*
* 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 = bq27xxx_read(di, BQ27XXX_REG_AE, false);
if (ae < 0) {
dev_dbg(di->dev, "error reading available energy\n");
return ae;
}
if (di->chip == BQ27200)
ae = ae * 29200 / BQ27200_RS;
else
ae *= 1000;
return ae;
}
/*
* Return the battery temperature in tenths of degree Kelvin
* Or < 0 if something fails.
*/
static int bq27x00_battery_read_temperature(struct bq27x00_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 == BQ27200)
temp = 5 * temp / 2;
return temp;
}
/*
* 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 = 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 bq27x00_battery_read_time(struct bq27x00_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 a power avg register.
* Return < 0 if something fails.
*/
static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
{
int tval;
tval = bq27xxx_read(di, reg, false);
if (tval < 0) {
dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
reg, tval);
return tval;
}
if (di->chip == BQ27200)
return (tval * BQ27200_POWER_CONSTANT) / BQ27200_RS;
else
return tval;
}
static int overtemperature(struct bq27x00_device_info *di, u16 flags)
{
if (di->chip == BQ27520)
return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
else
return flags & BQ27XXX_FLAG_OTC;
}
/*
* Read flag register.
* Return < 0 if something fails.
*/
static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
{
u16 tval;
tval = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
if (tval < 0) {
dev_err(di->dev, "error reading flag register:%d\n", tval);
return tval;
}
if ((di->chip == BQ27200)) {
if (tval & BQ27200_FLAG_EDV1)
tval = POWER_SUPPLY_HEALTH_DEAD;
else
tval = POWER_SUPPLY_HEALTH_GOOD;
return tval;
} else {
if (tval & BQ27XXX_FLAG_SOCF)
tval = POWER_SUPPLY_HEALTH_DEAD;
else if (overtemperature(di, tval))
tval = POWER_SUPPLY_HEALTH_OVERHEAT;
else
tval = POWER_SUPPLY_HEALTH_GOOD;
return tval;
}
return -1;
}
static void bq27x00_update(struct bq27x00_device_info *di)
{
struct bq27x00_reg_cache cache = {0, };
bool is_bq27200 = di->chip == BQ27200;
bool is_bq27500 = di->chip == BQ27500;
bool is_bq274xx = di->chip == BQ274XX;
bool is_bq276xx = di->chip == BQ276XX;
cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, !is_bq27500);
if (cache.flags >= 0) {
if (is_bq27200 && (cache.flags & BQ27200_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 {
cache.capacity = bq27x00_battery_read_soc(di);
if (!(is_bq274xx || is_bq276xx)) {
cache.energy = bq27x00_battery_read_energy(di);
cache.time_to_empty =
bq27x00_battery_read_time(di,
BQ27XXX_REG_TTE);
cache.time_to_empty_avg =
bq27x00_battery_read_time(di,
BQ27XXX_REG_TTECP);
cache.time_to_full =
bq27x00_battery_read_time(di,
BQ27XXX_REG_TTF);
}
cache.charge_full = bq27x00_battery_read_fcc(di);
cache.health = bq27x00_battery_read_health(di);
}
cache.temperature = bq27x00_battery_read_temperature(di);
if (!is_bq274xx)
cache.cycle_count = bq27x00_battery_read_cyct(di);
cache.power_avg =
bq27x00_battery_read_pwr_avg(di, BQ27XXX_POWER_AVG);
/* We only have to read charge design full once */
if (di->charge_design_full <= 0)
di->charge_design_full = bq27x00_battery_read_dcap(di);
}
if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
di->cache = cache;
power_supply_changed(&di->bat);
}
di->last_update = jiffies;
}
static void copy_to_dm_buf_big_endian(struct bq27x00_device_info *di,