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bq2415x_charger.c
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/*
* bq2415x charger driver
*
* Copyright (C) 2011-2013 Pali Rohár <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Datasheets:
* http://www.ti.com/product/bq24150
* http://www.ti.com/product/bq24150a
* http://www.ti.com/product/bq24152
* http://www.ti.com/product/bq24153
* http://www.ti.com/product/bq24153a
* http://www.ti.com/product/bq24155
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/err.h>
#include <linux/workqueue.h>
#include <linux/sysfs.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/power/bq2415x_charger.h>
/* timeout for resetting chip timer */
#define BQ2415X_TIMER_TIMEOUT 10
#define BQ2415X_REG_STATUS 0x00
#define BQ2415X_REG_CONTROL 0x01
#define BQ2415X_REG_VOLTAGE 0x02
#define BQ2415X_REG_VENDER 0x03
#define BQ2415X_REG_CURRENT 0x04
/* reset state for all registers */
#define BQ2415X_RESET_STATUS BIT(6)
#define BQ2415X_RESET_CONTROL (BIT(4)|BIT(5))
#define BQ2415X_RESET_VOLTAGE (BIT(1)|BIT(3))
#define BQ2415X_RESET_CURRENT (BIT(0)|BIT(3)|BIT(7))
/* status register */
#define BQ2415X_BIT_TMR_RST 7
#define BQ2415X_BIT_OTG 7
#define BQ2415X_BIT_EN_STAT 6
#define BQ2415X_MASK_STAT (BIT(4)|BIT(5))
#define BQ2415X_SHIFT_STAT 4
#define BQ2415X_BIT_BOOST 3
#define BQ2415X_MASK_FAULT (BIT(0)|BIT(1)|BIT(2))
#define BQ2415X_SHIFT_FAULT 0
/* control register */
#define BQ2415X_MASK_LIMIT (BIT(6)|BIT(7))
#define BQ2415X_SHIFT_LIMIT 6
#define BQ2415X_MASK_VLOWV (BIT(4)|BIT(5))
#define BQ2415X_SHIFT_VLOWV 4
#define BQ2415X_BIT_TE 3
#define BQ2415X_BIT_CE 2
#define BQ2415X_BIT_HZ_MODE 1
#define BQ2415X_BIT_OPA_MODE 0
/* voltage register */
#define BQ2415X_MASK_VO (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
#define BQ2415X_SHIFT_VO 2
#define BQ2415X_BIT_OTG_PL 1
#define BQ2415X_BIT_OTG_EN 0
/* vender register */
#define BQ2415X_MASK_VENDER (BIT(5)|BIT(6)|BIT(7))
#define BQ2415X_SHIFT_VENDER 5
#define BQ2415X_MASK_PN (BIT(3)|BIT(4))
#define BQ2415X_SHIFT_PN 3
#define BQ2415X_MASK_REVISION (BIT(0)|BIT(1)|BIT(2))
#define BQ2415X_SHIFT_REVISION 0
/* current register */
#define BQ2415X_MASK_RESET BIT(7)
#define BQ2415X_MASK_VI_CHRG (BIT(4)|BIT(5)|BIT(6))
#define BQ2415X_SHIFT_VI_CHRG 4
/* N/A BIT(3) */
#define BQ2415X_MASK_VI_TERM (BIT(0)|BIT(1)|BIT(2))
#define BQ2415X_SHIFT_VI_TERM 0
enum bq2415x_command {
BQ2415X_TIMER_RESET,
BQ2415X_OTG_STATUS,
BQ2415X_STAT_PIN_STATUS,
BQ2415X_STAT_PIN_ENABLE,
BQ2415X_STAT_PIN_DISABLE,
BQ2415X_CHARGE_STATUS,
BQ2415X_BOOST_STATUS,
BQ2415X_FAULT_STATUS,
BQ2415X_CHARGE_TERMINATION_STATUS,
BQ2415X_CHARGE_TERMINATION_ENABLE,
BQ2415X_CHARGE_TERMINATION_DISABLE,
BQ2415X_CHARGER_STATUS,
BQ2415X_CHARGER_ENABLE,
BQ2415X_CHARGER_DISABLE,
BQ2415X_HIGH_IMPEDANCE_STATUS,
BQ2415X_HIGH_IMPEDANCE_ENABLE,
BQ2415X_HIGH_IMPEDANCE_DISABLE,
BQ2415X_BOOST_MODE_STATUS,
BQ2415X_BOOST_MODE_ENABLE,
BQ2415X_BOOST_MODE_DISABLE,
BQ2415X_OTG_LEVEL,
BQ2415X_OTG_ACTIVATE_HIGH,
BQ2415X_OTG_ACTIVATE_LOW,
BQ2415X_OTG_PIN_STATUS,
BQ2415X_OTG_PIN_ENABLE,
BQ2415X_OTG_PIN_DISABLE,
BQ2415X_VENDER_CODE,
BQ2415X_PART_NUMBER,
BQ2415X_REVISION,
};
enum bq2415x_chip {
BQUNKNOWN,
BQ24150,
BQ24150A,
BQ24151,
BQ24151A,
BQ24152,
BQ24153,
BQ24153A,
BQ24155,
BQ24156,
BQ24156A,
BQ24158,
};
static char *bq2415x_chip_name[] = {
"unknown",
"bq24150",
"bq24150a",
"bq24151",
"bq24151a",
"bq24152",
"bq24153",
"bq24153a",
"bq24155",
"bq24156",
"bq24156a",
"bq24158",
};
struct bq2415x_device {
struct device *dev;
struct bq2415x_platform_data init_data;
struct power_supply charger;
struct delayed_work work;
struct power_supply *notify_psy;
struct notifier_block nb;
enum bq2415x_mode reported_mode;/* mode reported by hook function */
enum bq2415x_mode mode; /* current configured mode */
enum bq2415x_chip chip;
const char *timer_error;
char *model;
char *name;
int autotimer; /* 1 - if driver automatically reset timer, 0 - not */
int automode; /* 1 - enabled, 0 - disabled; -1 - not supported */
int id;
};
/* each registered chip must have unique id */
static DEFINE_IDR(bq2415x_id);
static DEFINE_MUTEX(bq2415x_id_mutex);
static DEFINE_MUTEX(bq2415x_timer_mutex);
static DEFINE_MUTEX(bq2415x_i2c_mutex);
/**** i2c read functions ****/
/* read value from register */
static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
{
struct i2c_client *client = to_i2c_client(bq->dev);
struct i2c_msg msg[2];
u8 val;
int ret;
if (!client->adapter)
return -ENODEV;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].buf = ®
msg[0].len = sizeof(reg);
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].buf = &val;
msg[1].len = sizeof(val);
mutex_lock(&bq2415x_i2c_mutex);
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
mutex_unlock(&bq2415x_i2c_mutex);
if (ret < 0)
return ret;
return val;
}
/* read value from register, apply mask and right shift it */
static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
u8 mask, u8 shift)
{
int ret;
if (shift > 8)
return -EINVAL;
ret = bq2415x_i2c_read(bq, reg);
if (ret < 0)
return ret;
return (ret & mask) >> shift;
}
/* read value from register and return one specified bit */
static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
{
if (bit > 8)
return -EINVAL;
return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
}
/**** i2c write functions ****/
/* write value to register */
static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
{
struct i2c_client *client = to_i2c_client(bq->dev);
struct i2c_msg msg[1];
u8 data[2];
int ret;
data[0] = reg;
data[1] = val;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].buf = data;
msg[0].len = ARRAY_SIZE(data);
mutex_lock(&bq2415x_i2c_mutex);
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
mutex_unlock(&bq2415x_i2c_mutex);
/* i2c_transfer returns number of messages transferred */
if (ret < 0)
return ret;
else if (ret != 1)
return -EIO;
return 0;
}
/* read value from register, change it with mask left shifted and write back */
static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
u8 mask, u8 shift)
{
int ret;
if (shift > 8)
return -EINVAL;
ret = bq2415x_i2c_read(bq, reg);
if (ret < 0)
return ret;
ret &= ~mask;
ret |= val << shift;
return bq2415x_i2c_write(bq, reg, ret);
}
/* change only one bit in register */
static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
bool val, u8 bit)
{
if (bit > 8)
return -EINVAL;
return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
}
/**** global functions ****/
/* exec command function */
static int bq2415x_exec_command(struct bq2415x_device *bq,
enum bq2415x_command command)
{
int ret;
switch (command) {
case BQ2415X_TIMER_RESET:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
1, BQ2415X_BIT_TMR_RST);
case BQ2415X_OTG_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
BQ2415X_BIT_OTG);
case BQ2415X_STAT_PIN_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
BQ2415X_BIT_EN_STAT);
case BQ2415X_STAT_PIN_ENABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
BQ2415X_BIT_EN_STAT);
case BQ2415X_STAT_PIN_DISABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
BQ2415X_BIT_EN_STAT);
case BQ2415X_CHARGE_STATUS:
return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
case BQ2415X_BOOST_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
BQ2415X_BIT_BOOST);
case BQ2415X_FAULT_STATUS:
return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
case BQ2415X_CHARGE_TERMINATION_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
BQ2415X_BIT_TE);
case BQ2415X_CHARGE_TERMINATION_ENABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
1, BQ2415X_BIT_TE);
case BQ2415X_CHARGE_TERMINATION_DISABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
0, BQ2415X_BIT_TE);
case BQ2415X_CHARGER_STATUS:
ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
BQ2415X_BIT_CE);
if (ret < 0)
return ret;
else
return ret > 0 ? 0 : 1;
case BQ2415X_CHARGER_ENABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
0, BQ2415X_BIT_CE);
case BQ2415X_CHARGER_DISABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
1, BQ2415X_BIT_CE);
case BQ2415X_HIGH_IMPEDANCE_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
BQ2415X_BIT_HZ_MODE);
case BQ2415X_HIGH_IMPEDANCE_ENABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
1, BQ2415X_BIT_HZ_MODE);
case BQ2415X_HIGH_IMPEDANCE_DISABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
0, BQ2415X_BIT_HZ_MODE);
case BQ2415X_BOOST_MODE_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
BQ2415X_BIT_OPA_MODE);
case BQ2415X_BOOST_MODE_ENABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
1, BQ2415X_BIT_OPA_MODE);
case BQ2415X_BOOST_MODE_DISABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
0, BQ2415X_BIT_OPA_MODE);
case BQ2415X_OTG_LEVEL:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
BQ2415X_BIT_OTG_PL);
case BQ2415X_OTG_ACTIVATE_HIGH:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
1, BQ2415X_BIT_OTG_PL);
case BQ2415X_OTG_ACTIVATE_LOW:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
0, BQ2415X_BIT_OTG_PL);
case BQ2415X_OTG_PIN_STATUS:
return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
BQ2415X_BIT_OTG_EN);
case BQ2415X_OTG_PIN_ENABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
1, BQ2415X_BIT_OTG_EN);
case BQ2415X_OTG_PIN_DISABLE:
return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
0, BQ2415X_BIT_OTG_EN);
case BQ2415X_VENDER_CODE:
return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
case BQ2415X_PART_NUMBER:
return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
case BQ2415X_REVISION:
return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
}
return -EINVAL;
}
/* detect chip type */
static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
{
struct i2c_client *client = to_i2c_client(bq->dev);
int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
if (ret < 0)
return ret;
switch (client->addr) {
case 0x6b:
switch (ret) {
case 0:
if (bq->chip == BQ24151A)
return bq->chip;
else
return BQ24151;
case 1:
if (bq->chip == BQ24150A ||
bq->chip == BQ24152 ||
bq->chip == BQ24155)
return bq->chip;
else
return BQ24150;
case 2:
if (bq->chip == BQ24153A)
return bq->chip;
else
return BQ24153;
default:
return BQUNKNOWN;
}
break;
case 0x6a:
switch (ret) {
case 0:
if (bq->chip == BQ24156A)
return bq->chip;
else
return BQ24156;
case 2:
return BQ24158;
default:
return BQUNKNOWN;
}
break;
}
return BQUNKNOWN;
}
/* detect chip revision */
static int bq2415x_detect_revision(struct bq2415x_device *bq)
{
int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
int chip = bq2415x_detect_chip(bq);
if (ret < 0 || chip < 0)
return -1;
switch (chip) {
case BQ24150:
case BQ24150A:
case BQ24151:
case BQ24151A:
case BQ24152:
if (ret >= 0 && ret <= 3)
return ret;
else
return -1;
case BQ24153:
case BQ24153A:
case BQ24156:
case BQ24156A:
case BQ24158:
if (ret == 3)
return 0;
else if (ret == 1)
return 1;
else
return -1;
case BQ24155:
if (ret == 3)
return 3;
else
return -1;
case BQUNKNOWN:
return -1;
}
return -1;
}
/* return chip vender code */
static int bq2415x_get_vender_code(struct bq2415x_device *bq)
{
int ret;
ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
if (ret < 0)
return 0;
/* convert to binary */
return (ret & 0x1) +
((ret >> 1) & 0x1) * 10 +
((ret >> 2) & 0x1) * 100;
}
/* reset all chip registers to default state */
static void bq2415x_reset_chip(struct bq2415x_device *bq)
{
bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
bq->timer_error = NULL;
}
/**** properties functions ****/
/* set current limit in mA */
static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
{
int val;
if (mA <= 100)
val = 0;
else if (mA <= 500)
val = 1;
else if (mA <= 800)
val = 2;
else
val = 3;
return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
}
/* get current limit in mA */
static int bq2415x_get_current_limit(struct bq2415x_device *bq)
{
int ret;
ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
if (ret < 0)
return ret;
else if (ret == 0)
return 100;
else if (ret == 1)
return 500;
else if (ret == 2)
return 800;
else if (ret == 3)
return 1800;
return -EINVAL;
}
/* set weak battery voltage in mV */
static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
{
int val;
/* round to 100mV */
if (mV <= 3400 + 50)
val = 0;
else if (mV <= 3500 + 50)
val = 1;
else if (mV <= 3600 + 50)
val = 2;
else
val = 3;
return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
}
/* get weak battery voltage in mV */
static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
{
int ret;
ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
if (ret < 0)
return ret;
return 100 * (34 + ret);
}
/* set battery regulation voltage in mV */
static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
int mV)
{
int val = (mV/10 - 350) / 2;
/*
* According to datasheet, maximum battery regulation voltage is
* 4440mV which is b101111 = 47.
*/
if (val < 0)
val = 0;
else if (val > 47)
return -EINVAL;
return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
}
/* get battery regulation voltage in mV */
static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
{
int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
if (ret < 0)
return ret;
return 10 * (350 + 2*ret);
}
/* set charge current in mA (platform data must provide resistor sense) */
static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
{
int val;
if (bq->init_data.resistor_sense <= 0)
return -ENOSYS;
val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
if (val < 0)
val = 0;
else if (val > 7)
val = 7;
return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
BQ2415X_SHIFT_VI_CHRG);
}
/* get charge current in mA (platform data must provide resistor sense) */
static int bq2415x_get_charge_current(struct bq2415x_device *bq)
{
int ret;
if (bq->init_data.resistor_sense <= 0)
return -ENOSYS;
ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
if (ret < 0)
return ret;
return (37400 + 6800*ret) / bq->init_data.resistor_sense;
}
/* set termination current in mA (platform data must provide resistor sense) */
static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
{
int val;
if (bq->init_data.resistor_sense <= 0)
return -ENOSYS;
val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
if (val < 0)
val = 0;
else if (val > 7)
val = 7;
return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
BQ2415X_SHIFT_VI_TERM);
}
/* get termination current in mA (platform data must provide resistor sense) */
static int bq2415x_get_termination_current(struct bq2415x_device *bq)
{
int ret;
if (bq->init_data.resistor_sense <= 0)
return -ENOSYS;
ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
if (ret < 0)
return ret;
return (3400 + 3400*ret) / bq->init_data.resistor_sense;
}
/* set default value of property */
#define bq2415x_set_default_value(bq, prop) \
do { \
int ret = 0; \
if (bq->init_data.prop != -1) \
ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
if (ret < 0) \
return ret; \
} while (0)
/* set default values of all properties */
static int bq2415x_set_defaults(struct bq2415x_device *bq)
{
bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
bq2415x_set_default_value(bq, current_limit);
bq2415x_set_default_value(bq, weak_battery_voltage);
bq2415x_set_default_value(bq, battery_regulation_voltage);
if (bq->init_data.resistor_sense > 0) {
bq2415x_set_default_value(bq, charge_current);
bq2415x_set_default_value(bq, termination_current);
bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
}
bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
return 0;
}
/**** charger mode functions ****/
/* set charger mode */
static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
{
int ret = 0;
int charger = 0;
int boost = 0;
if (mode == BQ2415X_MODE_BOOST)
boost = 1;
else if (mode != BQ2415X_MODE_OFF)
charger = 1;
if (!charger)
ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
if (!boost)
ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
if (ret < 0)
return ret;
switch (mode) {
case BQ2415X_MODE_OFF:
dev_dbg(bq->dev, "changing mode to: Offline\n");
ret = bq2415x_set_current_limit(bq, 100);
break;
case BQ2415X_MODE_NONE:
dev_dbg(bq->dev, "changing mode to: N/A\n");
ret = bq2415x_set_current_limit(bq, 100);
break;
case BQ2415X_MODE_HOST_CHARGER:
dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
ret = bq2415x_set_current_limit(bq, 500);
break;
case BQ2415X_MODE_DEDICATED_CHARGER:
dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
ret = bq2415x_set_current_limit(bq, 1800);
break;
case BQ2415X_MODE_BOOST: /* Boost mode */
dev_dbg(bq->dev, "changing mode to: Boost\n");
ret = bq2415x_set_current_limit(bq, 100);
break;
}
if (ret < 0)
return ret;
if (charger)
ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
else if (boost)
ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
if (ret < 0)
return ret;
bq2415x_set_default_value(bq, weak_battery_voltage);
bq2415x_set_default_value(bq, battery_regulation_voltage);
bq->mode = mode;
sysfs_notify(&bq->charger.dev->kobj, NULL, "mode");
return 0;
}
static int bq2415x_notifier_call(struct notifier_block *nb,
unsigned long val, void *v)
{
struct bq2415x_device *bq =
container_of(nb, struct bq2415x_device, nb);
struct power_supply *psy = v;
enum bq2415x_mode mode;
union power_supply_propval prop;
int ret;
int mA;
if (val != PSY_EVENT_PROP_CHANGED)
return NOTIFY_OK;
if (psy != bq->notify_psy)
return NOTIFY_OK;
dev_dbg(bq->dev, "notifier call was called\n");
ret = psy->get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX, &prop);
if (ret != 0)
return NOTIFY_OK;
mA = prop.intval;
if (mA == 0)
mode = BQ2415X_MODE_OFF;
else if (mA < 500)
mode = BQ2415X_MODE_NONE;
else if (mA < 1800)
mode = BQ2415X_MODE_HOST_CHARGER;
else
mode = BQ2415X_MODE_DEDICATED_CHARGER;
if (bq->reported_mode == mode)
return NOTIFY_OK;
bq->reported_mode = mode;
/* if automode is not enabled do not tell about reported_mode */
if (bq->automode < 1)
return NOTIFY_OK;
schedule_delayed_work(&bq->work, 0);
return NOTIFY_OK;
}
/**** timer functions ****/
/* enable/disable auto resetting chip timer */
static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
{
mutex_lock(&bq2415x_timer_mutex);
if (bq->autotimer == state) {
mutex_unlock(&bq2415x_timer_mutex);
return;
}
bq->autotimer = state;
if (state) {
schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
bq->timer_error = NULL;
} else {
cancel_delayed_work_sync(&bq->work);
}
mutex_unlock(&bq2415x_timer_mutex);
}
/* called by bq2415x_timer_work on timer error */
static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
{
bq->timer_error = msg;
sysfs_notify(&bq->charger.dev->kobj, NULL, "timer");
dev_err(bq->dev, "%s\n", msg);
if (bq->automode > 0)
bq->automode = 0;
bq2415x_set_mode(bq, BQ2415X_MODE_OFF);
bq2415x_set_autotimer(bq, 0);
}
/* delayed work function for auto resetting chip timer */
static void bq2415x_timer_work(struct work_struct *work)
{
struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
work.work);
int ret;
int error;
int boost;
if (bq->automode > 0 && (bq->reported_mode != bq->mode)) {
sysfs_notify(&bq->charger.dev->kobj, NULL, "reported_mode");
bq2415x_set_mode(bq, bq->reported_mode);
}
if (!bq->autotimer)
return;
ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
if (ret < 0) {
bq2415x_timer_error(bq, "Resetting timer failed");
return;
}
boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
if (boost < 0) {
bq2415x_timer_error(bq, "Unknown error");
return;
}
error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
if (error < 0) {
bq2415x_timer_error(bq, "Unknown error");
return;
}
if (boost) {
switch (error) {
/* Non fatal errors, chip is OK */
case 0: /* No error */
break;
case 6: /* Timer expired */
dev_err(bq->dev, "Timer expired\n");
break;
case 3: /* Battery voltage too low */
dev_err(bq->dev, "Battery voltage to low\n");
break;
/* Fatal errors, disable and reset chip */
case 1: /* Overvoltage protection (chip fried) */
bq2415x_timer_error(bq,
"Overvoltage protection (chip fried)");
return;
case 2: /* Overload */
bq2415x_timer_error(bq, "Overload");
return;
case 4: /* Battery overvoltage protection */
bq2415x_timer_error(bq,
"Battery overvoltage protection");
return;
case 5: /* Thermal shutdown (too hot) */
bq2415x_timer_error(bq,
"Thermal shutdown (too hot)");
return;
case 7: /* N/A */
bq2415x_timer_error(bq, "Unknown error");
return;
}
} else {
switch (error) {
/* Non fatal errors, chip is OK */
case 0: /* No error */
break;
case 2: /* Sleep mode */
dev_err(bq->dev, "Sleep mode\n");
break;
case 3: /* Poor input source */
dev_err(bq->dev, "Poor input source\n");
break;
case 6: /* Timer expired */
dev_err(bq->dev, "Timer expired\n");
break;
case 7: /* No battery */
dev_err(bq->dev, "No battery\n");
break;
/* Fatal errors, disable and reset chip */
case 1: /* Overvoltage protection (chip fried) */
bq2415x_timer_error(bq,
"Overvoltage protection (chip fried)");
return;
case 4: /* Battery overvoltage protection */
bq2415x_timer_error(bq,
"Battery overvoltage protection");
return;
case 5: /* Thermal shutdown (too hot) */
bq2415x_timer_error(bq,
"Thermal shutdown (too hot)");
return;
}
}
schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
}
/**** power supply interface code ****/
static enum power_supply_property bq2415x_power_supply_props[] = {
/* TODO: maybe add more power supply properties */
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_MODEL_NAME,
};
static int bq2415x_power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{