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linux-next/drivers/power/supply/bq2415x_charger.c
Sebastian Reichel 06215ce999 power: supply: bq2415x: fix race-condition in sysfs registration 
This registers custom sysfs properties using the native functionality
of the power-supply framework, which cleans up the code a bit and
fixes a race-condition. Before this patch the sysfs attributes were
not properly registered to udev.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2018-12-13 00:15:21 +01:00

1803 lines
46 KiB
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/*
* bq2415x charger driver
*
* Copyright (C) 2011-2013 Pali Rohár <pali.rohar@gmail.com>
*
* 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.
*
* 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
* http://www.ti.com/product/bq24157s
* http://www.ti.com/product/bq24158
*/
#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/acpi.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,
BQ24157S,
BQ24158,
};
static char *bq2415x_chip_name[] = {
"unknown",
"bq24150",
"bq24150a",
"bq24151",
"bq24151a",
"bq24152",
"bq24153",
"bq24153a",
"bq24155",
"bq24156",
"bq24156a",
"bq24157s",
"bq24158",
};
struct bq2415x_device {
struct device *dev;
struct bq2415x_platform_data init_data;
struct power_supply *charger;
struct power_supply_desc charger_desc;
struct delayed_work work;
struct device_node *notify_node;
struct notifier_block nb;
enum bq2415x_mode reported_mode;/* mode reported by hook function */
enum bq2415x_mode mode; /* currently 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 = &reg;
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;
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;
return BQ24151;
case 1:
if (bq->chip == BQ24150A ||
bq->chip == BQ24152 ||
bq->chip == BQ24155)
return bq->chip;
return BQ24150;
case 2:
if (bq->chip == BQ24153A)
return bq->chip;
return BQ24153;
default:
return BQUNKNOWN;
}
break;
case 0x6a:
switch (ret) {
case 0:
if (bq->chip == BQ24156A)
return bq->chip;
return BQ24156;
case 2:
if (bq->chip == BQ24157S)
return bq->chip;
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;
return -1;
case BQ24153:
case BQ24153A:
case BQ24156:
case BQ24156A:
case BQ24157S:
case BQ24158:
if (ret == 3)
return 0;
else if (ret == 1)
return 1;
return -1;
case BQ24155:
if (ret == 3)
return 3;
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 -EINVAL;
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 -EINVAL;
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 -EINVAL;
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 -EINVAL;
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 bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA)
{
enum bq2415x_mode mode;
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 false;
bq->reported_mode = mode;
return true;
}
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;
union power_supply_propval prop;
int ret;
if (val != PSY_EVENT_PROP_CHANGED)
return NOTIFY_OK;
/* Ignore event if it was not send by notify_node/notify_device */
if (bq->notify_node) {
if (!psy->dev.parent ||
psy->dev.parent->of_node != bq->notify_node)
return NOTIFY_OK;
} else if (bq->init_data.notify_device) {
if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0)
return NOTIFY_OK;
}
dev_dbg(bq->dev, "notifier call was called\n");
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX,
&prop);
if (ret != 0)
return NOTIFY_OK;
if (!bq2415x_update_reported_mode(bq, prop.intval))
return NOTIFY_OK;
/* 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)
{
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
if (ret < 0)
return ret;
else if (ret == 0) /* Ready */
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
else if (ret == 1) /* Charge in progress */
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (ret == 2) /* Charge done */
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = bq->model;
break;
default:
return -EINVAL;
}
return 0;
}
static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
{
bq->autotimer = 0;
if (bq->automode > 0)
bq->automode = 0;
cancel_delayed_work_sync(&bq->work);
power_supply_unregister(bq->charger);
kfree(bq->model);
}
/**** additional sysfs entries for power supply interface ****/
/* show *_status entries */
static ssize_t bq2415x_sysfs_show_status(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
enum bq2415x_command command;
int ret;
if (strcmp(attr->attr.name, "otg_status") == 0)
command = BQ2415X_OTG_STATUS;
else if (strcmp(attr->attr.name, "charge_status") == 0)
command = BQ2415X_CHARGE_STATUS;
else if (strcmp(attr->attr.name, "boost_status") == 0)
command = BQ2415X_BOOST_STATUS;
else if (strcmp(attr->attr.name, "fault_status") == 0)
command = BQ2415X_FAULT_STATUS;
else
return -EINVAL;
ret = bq2415x_exec_command(bq, command);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
/*
* set timer entry:
* auto - enable auto mode
* off - disable auto mode
* (other values) - reset chip timer
*/
static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
int ret = 0;
if (strncmp(buf, "auto", 4) == 0)
bq2415x_set_autotimer(bq, 1);
else if (strncmp(buf, "off", 3) == 0)
bq2415x_set_autotimer(bq, 0);
else
ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
if (ret < 0)
return ret;
return count;
}
/* show timer entry (auto or off) */
static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
if (bq->timer_error)
return sprintf(buf, "%s\n", bq->timer_error);
if (bq->autotimer)
return sprintf(buf, "auto\n");
return sprintf(buf, "off\n");
}
/*
* set mode entry:
* auto - if automode is supported, enable it and set mode to reported
* none - disable charger and boost mode
* host - charging mode for host/hub chargers (current limit 500mA)
* dedicated - charging mode for dedicated chargers (unlimited current limit)
* boost - disable charger and enable boost mode
*/
static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
enum bq2415x_mode mode;
int ret = 0;
if (strncmp(buf, "auto", 4) == 0) {
if (bq->automode < 0)
return -EINVAL;
bq->automode = 1;
mode = bq->reported_mode;
} else if (strncmp(buf, "off", 3) == 0) {
if (bq->automode > 0)
bq->automode = 0;
mode = BQ2415X_MODE_OFF;
} else if (strncmp(buf, "none", 4) == 0) {
if (bq->automode > 0)
bq->automode = 0;
mode = BQ2415X_MODE_NONE;
} else if (strncmp(buf, "host", 4) == 0) {
if (bq->automode > 0)
bq->automode = 0;
mode = BQ2415X_MODE_HOST_CHARGER;
} else if (strncmp(buf, "dedicated", 9) == 0) {
if (bq->automode > 0)
bq->automode = 0;
mode = BQ2415X_MODE_DEDICATED_CHARGER;
} else if (strncmp(buf, "boost", 5) == 0) {
if (bq->automode > 0)
bq->automode = 0;
mode = BQ2415X_MODE_BOOST;
} else if (strncmp(buf, "reset", 5) == 0) {
bq2415x_reset_chip(bq);
bq2415x_set_defaults(bq);
if (bq->automode <= 0)
return count;
bq->automode = 1;
mode = bq->reported_mode;
} else {
return -EINVAL;
}
ret = bq2415x_set_mode(bq, mode);
if (ret < 0)
return ret;
return count;
}
/* show mode entry (auto, none, host, dedicated or boost) */
static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
ssize_t ret = 0;
if (bq->automode > 0)
ret += sprintf(buf+ret, "auto (");
switch (bq->mode) {
case BQ2415X_MODE_OFF:
ret += sprintf(buf+ret, "off");
break;
case BQ2415X_MODE_NONE:
ret += sprintf(buf+ret, "none");
break;
case BQ2415X_MODE_HOST_CHARGER:
ret += sprintf(buf+ret, "host");
break;
case BQ2415X_MODE_DEDICATED_CHARGER:
ret += sprintf(buf+ret, "dedicated");
break;
case BQ2415X_MODE_BOOST:
ret += sprintf(buf+ret, "boost");
break;
}
if (bq->automode > 0)
ret += sprintf(buf+ret, ")");
ret += sprintf(buf+ret, "\n");
return ret;
}
/* show reported_mode entry (none, host, dedicated or boost) */
static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
if (bq->automode < 0)
return -EINVAL;
switch (bq->reported_mode) {
case BQ2415X_MODE_OFF:
return sprintf(buf, "off\n");
case BQ2415X_MODE_NONE:
return sprintf(buf, "none\n");
case BQ2415X_MODE_HOST_CHARGER:
return sprintf(buf, "host\n");
case BQ2415X_MODE_DEDICATED_CHARGER:
return sprintf(buf, "dedicated\n");
case BQ2415X_MODE_BOOST:
return sprintf(buf, "boost\n");
}
return -EINVAL;
}
/* directly set raw value to chip register, format: 'register value' */
static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
ssize_t ret = 0;
unsigned int reg;
unsigned int val;
if (sscanf(buf, "%x %x", &reg, &val) != 2)
return -EINVAL;
if (reg > 4 || val > 255)
return -EINVAL;
ret = bq2415x_i2c_write(bq, reg, val);
if (ret < 0)
return ret;
return count;
}
/* print value of chip register, format: 'register=value' */
static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
u8 reg,
char *buf)
{
int ret = bq2415x_i2c_read(bq, reg);
if (ret < 0)
return sprintf(buf, "%#.2x=error %d\n", reg, ret);
return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
}
/* show all raw values of chip register, format per line: 'register=value' */
static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
ssize_t ret = 0;
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
return ret;
}
/* set current and voltage limit entries (in mA or mV) */
static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
long val;
int ret;
if (kstrtol(buf, 10, &val) < 0)
return -EINVAL;
if (strcmp(attr->attr.name, "current_limit") == 0)
ret = bq2415x_set_current_limit(bq, val);
else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
ret = bq2415x_set_weak_battery_voltage(bq, val);
else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
ret = bq2415x_set_battery_regulation_voltage(bq, val);
else if (strcmp(attr->attr.name, "charge_current") == 0)
ret = bq2415x_set_charge_current(bq, val);
else if (strcmp(attr->attr.name, "termination_current") == 0)
ret = bq2415x_set_termination_current(bq, val);
else
return -EINVAL;
if (ret < 0)
return ret;
return count;
}
/* show current and voltage limit entries (in mA or mV) */
static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
int ret;
if (strcmp(attr->attr.name, "current_limit") == 0)
ret = bq2415x_get_current_limit(bq);
else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
ret = bq2415x_get_weak_battery_voltage(bq);
else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
ret = bq2415x_get_battery_regulation_voltage(bq);
else if (strcmp(attr->attr.name, "charge_current") == 0)
ret = bq2415x_get_charge_current(bq);
else if (strcmp(attr->attr.name, "termination_current") == 0)
ret = bq2415x_get_termination_current(bq);
else
return -EINVAL;
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
/* set *_enable entries */
static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
enum bq2415x_command command;
long val;
int ret;
if (kstrtol(buf, 10, &val) < 0)
return -EINVAL;
if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
BQ2415X_CHARGE_TERMINATION_DISABLE;
else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
BQ2415X_HIGH_IMPEDANCE_DISABLE;
else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
command = val ? BQ2415X_OTG_PIN_ENABLE :
BQ2415X_OTG_PIN_DISABLE;
else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
command = val ? BQ2415X_STAT_PIN_ENABLE :
BQ2415X_STAT_PIN_DISABLE;
else
return -EINVAL;
ret = bq2415x_exec_command(bq, command);
if (ret < 0)
return ret;
return count;
}
/* show *_enable entries */
static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct power_supply *psy = dev_get_drvdata(dev);
struct bq2415x_device *bq = power_supply_get_drvdata(psy);
enum bq2415x_command command;
int ret;
if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
command = BQ2415X_CHARGE_TERMINATION_STATUS;
else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
command = BQ2415X_HIGH_IMPEDANCE_STATUS;
else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
command = BQ2415X_OTG_PIN_STATUS;
else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
command = BQ2415X_STAT_PIN_STATUS;
else
return -EINVAL;
ret = bq2415x_exec_command(bq, command);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
static DEVICE_ATTR(reported_mode, S_IRUGO,
bq2415x_sysfs_show_reported_mode, NULL);
static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
static struct attribute *bq2415x_sysfs_attrs[] = {
/*
* TODO: some (appropriate) of these attrs should be switched to
* use power supply class props.
*/
&dev_attr_current_limit.attr,
&dev_attr_weak_battery_voltage.attr,
&dev_attr_battery_regulation_voltage.attr,
&dev_attr_charge_current.attr,
&dev_attr_termination_current.attr,
&dev_attr_charge_termination_enable.attr,
&dev_attr_high_impedance_enable.attr,
&dev_attr_otg_pin_enable.attr,
&dev_attr_stat_pin_enable.attr,
&dev_attr_reported_mode.attr,
&dev_attr_mode.attr,
&dev_attr_timer.attr,
&dev_attr_registers.attr,
&dev_attr_otg_status.attr,
&dev_attr_charge_status.attr,
&dev_attr_boost_status.attr,
&dev_attr_fault_status.attr,
NULL,
};
ATTRIBUTE_GROUPS(bq2415x_sysfs);
static int bq2415x_power_supply_init(struct bq2415x_device *bq)
{
int ret;
int chip;
char revstr[8];
struct power_supply_config psy_cfg = {
.drv_data = bq,
.of_node = bq->dev->of_node,
.attr_grp = bq2415x_sysfs_groups,
};
bq->charger_desc.name = bq->name;
bq->charger_desc.type = POWER_SUPPLY_TYPE_USB;
bq->charger_desc.properties = bq2415x_power_supply_props;
bq->charger_desc.num_properties =
ARRAY_SIZE(bq2415x_power_supply_props);
bq->charger_desc.get_property = bq2415x_power_supply_get_property;
ret = bq2415x_detect_chip(bq);
if (ret < 0)
chip = BQUNKNOWN;
else
chip = ret;
ret = bq2415x_detect_revision(bq);
if (ret < 0)
strcpy(revstr, "unknown");
else
sprintf(revstr, "1.%d", ret);
bq->model = kasprintf(GFP_KERNEL,
"chip %s, revision %s, vender code %.3d",
bq2415x_chip_name[chip], revstr,
bq2415x_get_vender_code(bq));
if (!bq->model) {
dev_err(bq->dev, "failed to allocate model name\n");
return -ENOMEM;
}
bq->charger = power_supply_register(bq->dev, &bq->charger_desc,
&psy_cfg);
if (IS_ERR(bq->charger)) {
kfree(bq->model);
return PTR_ERR(bq->charger);
}
return 0;
}
/* main bq2415x probe function */
static int bq2415x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
int num;
char *name = NULL;
struct bq2415x_device *bq;
struct device_node *np = client->dev.of_node;
struct bq2415x_platform_data *pdata = client->dev.platform_data;
const struct acpi_device_id *acpi_id = NULL;
struct power_supply *notify_psy = NULL;
union power_supply_propval prop;
if (!np && !pdata && !ACPI_HANDLE(&client->dev)) {
dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n");
return -ENODEV;
}
/* Get new ID for the new device */
mutex_lock(&bq2415x_id_mutex);
num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
mutex_unlock(&bq2415x_id_mutex);
if (num < 0)
return num;
if (id) {
name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
} else if (ACPI_HANDLE(&client->dev)) {
acpi_id =
acpi_match_device(client->dev.driver->acpi_match_table,
&client->dev);
if (!acpi_id) {
dev_err(&client->dev, "failed to match device name\n");
ret = -ENODEV;
goto error_1;
}
name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num);
}
if (!name) {
dev_err(&client->dev, "failed to allocate device name\n");
ret = -ENOMEM;
goto error_1;
}
bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL);
if (!bq) {
ret = -ENOMEM;
goto error_2;
}
i2c_set_clientdata(client, bq);
bq->id = num;
bq->dev = &client->dev;
if (id)
bq->chip = id->driver_data;
else if (ACPI_HANDLE(bq->dev))
bq->chip = acpi_id->driver_data;
bq->name = name;
bq->mode = BQ2415X_MODE_OFF;
bq->reported_mode = BQ2415X_MODE_OFF;
bq->autotimer = 0;
bq->automode = 0;
if (np || ACPI_HANDLE(bq->dev)) {
ret = device_property_read_u32(bq->dev,
"ti,current-limit",
&bq->init_data.current_limit);
if (ret)
goto error_2;
ret = device_property_read_u32(bq->dev,
"ti,weak-battery-voltage",
&bq->init_data.weak_battery_voltage);
if (ret)
goto error_2;
ret = device_property_read_u32(bq->dev,
"ti,battery-regulation-voltage",
&bq->init_data.battery_regulation_voltage);
if (ret)
goto error_2;
ret = device_property_read_u32(bq->dev,
"ti,charge-current",
&bq->init_data.charge_current);
if (ret)
goto error_2;
ret = device_property_read_u32(bq->dev,
"ti,termination-current",
&bq->init_data.termination_current);
if (ret)
goto error_2;
ret = device_property_read_u32(bq->dev,
"ti,resistor-sense",
&bq->init_data.resistor_sense);
if (ret)
goto error_2;
if (np)
bq->notify_node = of_parse_phandle(np,
"ti,usb-charger-detection", 0);
} else {
memcpy(&bq->init_data, pdata, sizeof(bq->init_data));
}
bq2415x_reset_chip(bq);
ret = bq2415x_power_supply_init(bq);
if (ret) {
dev_err(bq->dev, "failed to register power supply: %d\n", ret);
goto error_2;
}
ret = bq2415x_set_defaults(bq);
if (ret) {
dev_err(bq->dev, "failed to set default values: %d\n", ret);
goto error_3;
}
if (bq->notify_node || bq->init_data.notify_device) {
bq->nb.notifier_call = bq2415x_notifier_call;
ret = power_supply_reg_notifier(&bq->nb);
if (ret) {
dev_err(bq->dev, "failed to reg notifier: %d\n", ret);
goto error_3;
}
bq->automode = 1;
dev_info(bq->dev, "automode supported, waiting for events\n");
} else {
bq->automode = -1;
dev_info(bq->dev, "automode not supported\n");
}
/* Query for initial reported_mode and set it */
if (bq->nb.notifier_call) {
if (np) {
notify_psy = power_supply_get_by_phandle(np,
"ti,usb-charger-detection");
if (IS_ERR(notify_psy))
notify_psy = NULL;
} else if (bq->init_data.notify_device) {
notify_psy = power_supply_get_by_name(
bq->init_data.notify_device);
}
}
if (notify_psy) {
ret = power_supply_get_property(notify_psy,
POWER_SUPPLY_PROP_CURRENT_MAX, &prop);
power_supply_put(notify_psy);
if (ret == 0) {
bq2415x_update_reported_mode(bq, prop.intval);
bq2415x_set_mode(bq, bq->reported_mode);
}
}
INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
bq2415x_set_autotimer(bq, 1);
dev_info(bq->dev, "driver registered\n");
return 0;
error_3:
bq2415x_power_supply_exit(bq);
error_2:
if (bq)
of_node_put(bq->notify_node);
kfree(name);
error_1:
mutex_lock(&bq2415x_id_mutex);
idr_remove(&bq2415x_id, num);
mutex_unlock(&bq2415x_id_mutex);
return ret;
}
/* main bq2415x remove function */
static int bq2415x_remove(struct i2c_client *client)
{
struct bq2415x_device *bq = i2c_get_clientdata(client);
if (bq->nb.notifier_call)
power_supply_unreg_notifier(&bq->nb);
of_node_put(bq->notify_node);
bq2415x_power_supply_exit(bq);
bq2415x_reset_chip(bq);
mutex_lock(&bq2415x_id_mutex);
idr_remove(&bq2415x_id, bq->id);
mutex_unlock(&bq2415x_id_mutex);
dev_info(bq->dev, "driver unregistered\n");
kfree(bq->name);
return 0;
}
static const struct i2c_device_id bq2415x_i2c_id_table[] = {
{ "bq2415x", BQUNKNOWN },
{ "bq24150", BQ24150 },
{ "bq24150a", BQ24150A },
{ "bq24151", BQ24151 },
{ "bq24151a", BQ24151A },
{ "bq24152", BQ24152 },
{ "bq24153", BQ24153 },
{ "bq24153a", BQ24153A },
{ "bq24155", BQ24155 },
{ "bq24156", BQ24156 },
{ "bq24156a", BQ24156A },
{ "bq24157s", BQ24157S },
{ "bq24158", BQ24158 },
{},
};
MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
#ifdef CONFIG_ACPI
static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
{ "BQ2415X", BQUNKNOWN },
{ "BQ241500", BQ24150 },
{ "BQA24150", BQ24150A },
{ "BQ241510", BQ24151 },
{ "BQA24151", BQ24151A },
{ "BQ241520", BQ24152 },
{ "BQ241530", BQ24153 },
{ "BQA24153", BQ24153A },
{ "BQ241550", BQ24155 },
{ "BQ241560", BQ24156 },
{ "BQA24156", BQ24156A },
{ "BQS24157", BQ24157S },
{ "BQ241580", BQ24158 },
{},
};
MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
#endif
#ifdef CONFIG_OF
static const struct of_device_id bq2415x_of_match_table[] = {
{ .compatible = "ti,bq24150" },
{ .compatible = "ti,bq24150a" },
{ .compatible = "ti,bq24151" },
{ .compatible = "ti,bq24151a" },
{ .compatible = "ti,bq24152" },
{ .compatible = "ti,bq24153" },
{ .compatible = "ti,bq24153a" },
{ .compatible = "ti,bq24155" },
{ .compatible = "ti,bq24156" },
{ .compatible = "ti,bq24156a" },
{ .compatible = "ti,bq24157s" },
{ .compatible = "ti,bq24158" },
{},
};
MODULE_DEVICE_TABLE(of, bq2415x_of_match_table);
#endif
static struct i2c_driver bq2415x_driver = {
.driver = {
.name = "bq2415x-charger",
.of_match_table = of_match_ptr(bq2415x_of_match_table),
.acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
},
.probe = bq2415x_probe,
.remove = bq2415x_remove,
.id_table = bq2415x_i2c_id_table,
};
module_i2c_driver(bq2415x_driver);
MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
MODULE_DESCRIPTION("bq2415x charger driver");
MODULE_LICENSE("GPL");
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