mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
89a22b1a98
By passing in the dt node of this device, we enable the logic for linking power_supplies together from dt. This is specified by adding a "power-supplies" property with a phandle to the charger for a given supply. Enable this logic now for the sbs-battery driver. Signed-off-by: Rhyland Klein <rklein@nvidia.com> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
872 lines
21 KiB
C
872 lines
21 KiB
C
/*
|
|
* Gas Gauge driver for SBS Compliant Batteries
|
|
*
|
|
* Copyright (c) 2010, NVIDIA Corporation.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/err.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/power/sbs-battery.h>
|
|
|
|
enum {
|
|
REG_MANUFACTURER_DATA,
|
|
REG_TEMPERATURE,
|
|
REG_VOLTAGE,
|
|
REG_CURRENT,
|
|
REG_CAPACITY,
|
|
REG_TIME_TO_EMPTY,
|
|
REG_TIME_TO_FULL,
|
|
REG_STATUS,
|
|
REG_CYCLE_COUNT,
|
|
REG_SERIAL_NUMBER,
|
|
REG_REMAINING_CAPACITY,
|
|
REG_REMAINING_CAPACITY_CHARGE,
|
|
REG_FULL_CHARGE_CAPACITY,
|
|
REG_FULL_CHARGE_CAPACITY_CHARGE,
|
|
REG_DESIGN_CAPACITY,
|
|
REG_DESIGN_CAPACITY_CHARGE,
|
|
REG_DESIGN_VOLTAGE,
|
|
};
|
|
|
|
/* Battery Mode defines */
|
|
#define BATTERY_MODE_OFFSET 0x03
|
|
#define BATTERY_MODE_MASK 0x8000
|
|
enum sbs_battery_mode {
|
|
BATTERY_MODE_AMPS,
|
|
BATTERY_MODE_WATTS
|
|
};
|
|
|
|
/* manufacturer access defines */
|
|
#define MANUFACTURER_ACCESS_STATUS 0x0006
|
|
#define MANUFACTURER_ACCESS_SLEEP 0x0011
|
|
|
|
/* battery status value bits */
|
|
#define BATTERY_DISCHARGING 0x40
|
|
#define BATTERY_FULL_CHARGED 0x20
|
|
#define BATTERY_FULL_DISCHARGED 0x10
|
|
|
|
#define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
|
|
.psp = _psp, \
|
|
.addr = _addr, \
|
|
.min_value = _min_value, \
|
|
.max_value = _max_value, \
|
|
}
|
|
|
|
static const struct chip_data {
|
|
enum power_supply_property psp;
|
|
u8 addr;
|
|
int min_value;
|
|
int max_value;
|
|
} sbs_data[] = {
|
|
[REG_MANUFACTURER_DATA] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
|
|
[REG_TEMPERATURE] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
|
|
[REG_VOLTAGE] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
|
|
[REG_CURRENT] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
|
|
[REG_CAPACITY] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
|
|
[REG_REMAINING_CAPACITY] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
|
|
[REG_REMAINING_CAPACITY_CHARGE] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
|
|
[REG_FULL_CHARGE_CAPACITY] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
|
|
[REG_FULL_CHARGE_CAPACITY_CHARGE] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
|
|
[REG_TIME_TO_EMPTY] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
|
|
[REG_TIME_TO_FULL] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
|
|
[REG_STATUS] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
|
|
[REG_CYCLE_COUNT] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
|
|
[REG_DESIGN_CAPACITY] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
|
|
[REG_DESIGN_CAPACITY_CHARGE] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
|
|
[REG_DESIGN_VOLTAGE] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
|
|
[REG_SERIAL_NUMBER] =
|
|
SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
|
|
};
|
|
|
|
static enum power_supply_property sbs_properties[] = {
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_HEALTH,
|
|
POWER_SUPPLY_PROP_PRESENT,
|
|
POWER_SUPPLY_PROP_TECHNOLOGY,
|
|
POWER_SUPPLY_PROP_CYCLE_COUNT,
|
|
POWER_SUPPLY_PROP_VOLTAGE_NOW,
|
|
POWER_SUPPLY_PROP_CURRENT_NOW,
|
|
POWER_SUPPLY_PROP_CAPACITY,
|
|
POWER_SUPPLY_PROP_TEMP,
|
|
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
|
|
POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
|
|
POWER_SUPPLY_PROP_SERIAL_NUMBER,
|
|
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
|
|
POWER_SUPPLY_PROP_ENERGY_NOW,
|
|
POWER_SUPPLY_PROP_ENERGY_FULL,
|
|
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
|
|
POWER_SUPPLY_PROP_CHARGE_NOW,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
|
|
};
|
|
|
|
struct sbs_info {
|
|
struct i2c_client *client;
|
|
struct power_supply power_supply;
|
|
struct sbs_platform_data *pdata;
|
|
bool is_present;
|
|
bool gpio_detect;
|
|
bool enable_detection;
|
|
int irq;
|
|
int last_state;
|
|
int poll_time;
|
|
struct delayed_work work;
|
|
int ignore_changes;
|
|
};
|
|
|
|
static int sbs_read_word_data(struct i2c_client *client, u8 address)
|
|
{
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
s32 ret = 0;
|
|
int retries = 1;
|
|
|
|
if (chip->pdata)
|
|
retries = max(chip->pdata->i2c_retry_count + 1, 1);
|
|
|
|
while (retries > 0) {
|
|
ret = i2c_smbus_read_word_data(client, address);
|
|
if (ret >= 0)
|
|
break;
|
|
retries--;
|
|
}
|
|
|
|
if (ret < 0) {
|
|
dev_dbg(&client->dev,
|
|
"%s: i2c read at address 0x%x failed\n",
|
|
__func__, address);
|
|
return ret;
|
|
}
|
|
|
|
return le16_to_cpu(ret);
|
|
}
|
|
|
|
static int sbs_write_word_data(struct i2c_client *client, u8 address,
|
|
u16 value)
|
|
{
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
s32 ret = 0;
|
|
int retries = 1;
|
|
|
|
if (chip->pdata)
|
|
retries = max(chip->pdata->i2c_retry_count + 1, 1);
|
|
|
|
while (retries > 0) {
|
|
ret = i2c_smbus_write_word_data(client, address,
|
|
le16_to_cpu(value));
|
|
if (ret >= 0)
|
|
break;
|
|
retries--;
|
|
}
|
|
|
|
if (ret < 0) {
|
|
dev_dbg(&client->dev,
|
|
"%s: i2c write to address 0x%x failed\n",
|
|
__func__, address);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbs_get_battery_presence_and_health(
|
|
struct i2c_client *client, enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
s32 ret;
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
|
|
if (psp == POWER_SUPPLY_PROP_PRESENT &&
|
|
chip->gpio_detect) {
|
|
ret = gpio_get_value(chip->pdata->battery_detect);
|
|
if (ret == chip->pdata->battery_detect_present)
|
|
val->intval = 1;
|
|
else
|
|
val->intval = 0;
|
|
chip->is_present = val->intval;
|
|
return ret;
|
|
}
|
|
|
|
/* Write to ManufacturerAccess with
|
|
* ManufacturerAccess command and then
|
|
* read the status */
|
|
ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
|
|
MANUFACTURER_ACCESS_STATUS);
|
|
if (ret < 0) {
|
|
if (psp == POWER_SUPPLY_PROP_PRESENT)
|
|
val->intval = 0; /* battery removed */
|
|
return ret;
|
|
}
|
|
|
|
ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
|
|
ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
|
|
val->intval = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Mask the upper nibble of 2nd byte and
|
|
* lower byte of response then
|
|
* shift the result by 8 to get status*/
|
|
ret &= 0x0F00;
|
|
ret >>= 8;
|
|
if (psp == POWER_SUPPLY_PROP_PRESENT) {
|
|
if (ret == 0x0F)
|
|
/* battery removed */
|
|
val->intval = 0;
|
|
else
|
|
val->intval = 1;
|
|
} else if (psp == POWER_SUPPLY_PROP_HEALTH) {
|
|
if (ret == 0x09)
|
|
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
|
|
else if (ret == 0x0B)
|
|
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
|
|
else if (ret == 0x0C)
|
|
val->intval = POWER_SUPPLY_HEALTH_DEAD;
|
|
else
|
|
val->intval = POWER_SUPPLY_HEALTH_GOOD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbs_get_battery_property(struct i2c_client *client,
|
|
int reg_offset, enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
s32 ret;
|
|
|
|
ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* returned values are 16 bit */
|
|
if (sbs_data[reg_offset].min_value < 0)
|
|
ret = (s16)ret;
|
|
|
|
if (ret >= sbs_data[reg_offset].min_value &&
|
|
ret <= sbs_data[reg_offset].max_value) {
|
|
val->intval = ret;
|
|
if (psp != POWER_SUPPLY_PROP_STATUS)
|
|
return 0;
|
|
|
|
if (ret & BATTERY_FULL_CHARGED)
|
|
val->intval = POWER_SUPPLY_STATUS_FULL;
|
|
else if (ret & BATTERY_FULL_DISCHARGED)
|
|
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
else if (ret & BATTERY_DISCHARGING)
|
|
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
else
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
|
|
|
if (chip->poll_time == 0)
|
|
chip->last_state = val->intval;
|
|
else if (chip->last_state != val->intval) {
|
|
cancel_delayed_work_sync(&chip->work);
|
|
power_supply_changed(&chip->power_supply);
|
|
chip->poll_time = 0;
|
|
}
|
|
} else {
|
|
if (psp == POWER_SUPPLY_PROP_STATUS)
|
|
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
else
|
|
val->intval = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sbs_unit_adjustment(struct i2c_client *client,
|
|
enum power_supply_property psp, union power_supply_propval *val)
|
|
{
|
|
#define BASE_UNIT_CONVERSION 1000
|
|
#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
|
|
#define TIME_UNIT_CONVERSION 60
|
|
#define TEMP_KELVIN_TO_CELSIUS 2731
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_ENERGY_NOW:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
|
|
/* sbs provides energy in units of 10mWh.
|
|
* Convert to µWh
|
|
*/
|
|
val->intval *= BATTERY_MODE_CAP_MULT_WATT;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
val->intval *= BASE_UNIT_CONVERSION;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
/* sbs provides battery temperature in 0.1K
|
|
* so convert it to 0.1°C
|
|
*/
|
|
val->intval -= TEMP_KELVIN_TO_CELSIUS;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
|
|
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
|
|
/* sbs provides time to empty and time to full in minutes.
|
|
* Convert to seconds
|
|
*/
|
|
val->intval *= TIME_UNIT_CONVERSION;
|
|
break;
|
|
|
|
default:
|
|
dev_dbg(&client->dev,
|
|
"%s: no need for unit conversion %d\n", __func__, psp);
|
|
}
|
|
}
|
|
|
|
static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
|
|
enum sbs_battery_mode mode)
|
|
{
|
|
int ret, original_val;
|
|
|
|
original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
|
|
if (original_val < 0)
|
|
return original_val;
|
|
|
|
if ((original_val & BATTERY_MODE_MASK) == mode)
|
|
return mode;
|
|
|
|
if (mode == BATTERY_MODE_AMPS)
|
|
ret = original_val & ~BATTERY_MODE_MASK;
|
|
else
|
|
ret = original_val | BATTERY_MODE_MASK;
|
|
|
|
ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return original_val & BATTERY_MODE_MASK;
|
|
}
|
|
|
|
static int sbs_get_battery_capacity(struct i2c_client *client,
|
|
int reg_offset, enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
s32 ret;
|
|
enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
|
|
|
|
if (power_supply_is_amp_property(psp))
|
|
mode = BATTERY_MODE_AMPS;
|
|
|
|
mode = sbs_set_battery_mode(client, mode);
|
|
if (mode < 0)
|
|
return mode;
|
|
|
|
ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (psp == POWER_SUPPLY_PROP_CAPACITY) {
|
|
/* sbs spec says that this can be >100 %
|
|
* even if max value is 100 % */
|
|
val->intval = min(ret, 100);
|
|
} else
|
|
val->intval = ret;
|
|
|
|
ret = sbs_set_battery_mode(client, mode);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char sbs_serial[5];
|
|
static int sbs_get_battery_serial_number(struct i2c_client *client,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret;
|
|
|
|
ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = sprintf(sbs_serial, "%04x", ret);
|
|
val->strval = sbs_serial;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbs_get_property_index(struct i2c_client *client,
|
|
enum power_supply_property psp)
|
|
{
|
|
int count;
|
|
for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
|
|
if (psp == sbs_data[count].psp)
|
|
return count;
|
|
|
|
dev_warn(&client->dev,
|
|
"%s: Invalid Property - %d\n", __func__, psp);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int sbs_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret = 0;
|
|
struct sbs_info *chip = container_of(psy,
|
|
struct sbs_info, power_supply);
|
|
struct i2c_client *client = chip->client;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
ret = sbs_get_battery_presence_and_health(client, psp, val);
|
|
if (psp == POWER_SUPPLY_PROP_PRESENT)
|
|
return 0;
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
|
|
goto done; /* don't trigger power_supply_changed()! */
|
|
|
|
case POWER_SUPPLY_PROP_ENERGY_NOW:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL:
|
|
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
ret = sbs_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = sbs_get_battery_capacity(client, ret, psp, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_SERIAL_NUMBER:
|
|
ret = sbs_get_battery_serial_number(client, val);
|
|
break;
|
|
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
case POWER_SUPPLY_PROP_CYCLE_COUNT:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
|
|
case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
|
|
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
|
|
ret = sbs_get_property_index(client, psp);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = sbs_get_battery_property(client, ret, psp, val);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&client->dev,
|
|
"%s: INVALID property\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!chip->enable_detection)
|
|
goto done;
|
|
|
|
if (!chip->gpio_detect &&
|
|
chip->is_present != (ret >= 0)) {
|
|
chip->is_present = (ret >= 0);
|
|
power_supply_changed(&chip->power_supply);
|
|
}
|
|
|
|
done:
|
|
if (!ret) {
|
|
/* Convert units to match requirements for power supply class */
|
|
sbs_unit_adjustment(client, psp, val);
|
|
}
|
|
|
|
dev_dbg(&client->dev,
|
|
"%s: property = %d, value = %x\n", __func__, psp, val->intval);
|
|
|
|
if (ret && chip->is_present)
|
|
return ret;
|
|
|
|
/* battery not present, so return NODATA for properties */
|
|
if (ret)
|
|
return -ENODATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t sbs_irq(int irq, void *devid)
|
|
{
|
|
struct power_supply *battery = devid;
|
|
|
|
power_supply_changed(battery);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void sbs_external_power_changed(struct power_supply *psy)
|
|
{
|
|
struct sbs_info *chip;
|
|
|
|
chip = container_of(psy, struct sbs_info, power_supply);
|
|
|
|
if (chip->ignore_changes > 0) {
|
|
chip->ignore_changes--;
|
|
return;
|
|
}
|
|
|
|
/* cancel outstanding work */
|
|
cancel_delayed_work_sync(&chip->work);
|
|
|
|
schedule_delayed_work(&chip->work, HZ);
|
|
chip->poll_time = chip->pdata->poll_retry_count;
|
|
}
|
|
|
|
static void sbs_delayed_work(struct work_struct *work)
|
|
{
|
|
struct sbs_info *chip;
|
|
s32 ret;
|
|
|
|
chip = container_of(work, struct sbs_info, work.work);
|
|
|
|
ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
|
|
/* if the read failed, give up on this work */
|
|
if (ret < 0) {
|
|
chip->poll_time = 0;
|
|
return;
|
|
}
|
|
|
|
if (ret & BATTERY_FULL_CHARGED)
|
|
ret = POWER_SUPPLY_STATUS_FULL;
|
|
else if (ret & BATTERY_FULL_DISCHARGED)
|
|
ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
else if (ret & BATTERY_DISCHARGING)
|
|
ret = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
else
|
|
ret = POWER_SUPPLY_STATUS_CHARGING;
|
|
|
|
if (chip->last_state != ret) {
|
|
chip->poll_time = 0;
|
|
power_supply_changed(&chip->power_supply);
|
|
return;
|
|
}
|
|
if (chip->poll_time > 0) {
|
|
schedule_delayed_work(&chip->work, HZ);
|
|
chip->poll_time--;
|
|
return;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_OF)
|
|
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_gpio.h>
|
|
|
|
static const struct of_device_id sbs_dt_ids[] = {
|
|
{ .compatible = "sbs,sbs-battery" },
|
|
{ .compatible = "ti,bq20z75" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sbs_dt_ids);
|
|
|
|
static struct sbs_platform_data *sbs_of_populate_pdata(
|
|
struct i2c_client *client)
|
|
{
|
|
struct device_node *of_node = client->dev.of_node;
|
|
struct sbs_platform_data *pdata = client->dev.platform_data;
|
|
enum of_gpio_flags gpio_flags;
|
|
int rc;
|
|
u32 prop;
|
|
|
|
/* verify this driver matches this device */
|
|
if (!of_node)
|
|
return NULL;
|
|
|
|
/* if platform data is set, honor it */
|
|
if (pdata)
|
|
return pdata;
|
|
|
|
/* first make sure at least one property is set, otherwise
|
|
* it won't change behavior from running without pdata.
|
|
*/
|
|
if (!of_get_property(of_node, "sbs,i2c-retry-count", NULL) &&
|
|
!of_get_property(of_node, "sbs,poll-retry-count", NULL) &&
|
|
!of_get_property(of_node, "sbs,battery-detect-gpios", NULL))
|
|
goto of_out;
|
|
|
|
pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
|
|
GFP_KERNEL);
|
|
if (!pdata)
|
|
goto of_out;
|
|
|
|
rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
|
|
if (!rc)
|
|
pdata->i2c_retry_count = prop;
|
|
|
|
rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop);
|
|
if (!rc)
|
|
pdata->poll_retry_count = prop;
|
|
|
|
if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) {
|
|
pdata->battery_detect = -1;
|
|
goto of_out;
|
|
}
|
|
|
|
pdata->battery_detect = of_get_named_gpio_flags(of_node,
|
|
"sbs,battery-detect-gpios", 0, &gpio_flags);
|
|
|
|
if (gpio_flags & OF_GPIO_ACTIVE_LOW)
|
|
pdata->battery_detect_present = 0;
|
|
else
|
|
pdata->battery_detect_present = 1;
|
|
|
|
of_out:
|
|
return pdata;
|
|
}
|
|
#else
|
|
static struct sbs_platform_data *sbs_of_populate_pdata(
|
|
struct i2c_client *client)
|
|
{
|
|
return client->dev.platform_data;
|
|
}
|
|
#endif
|
|
|
|
static int sbs_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct sbs_info *chip;
|
|
struct sbs_platform_data *pdata = client->dev.platform_data;
|
|
int rc;
|
|
int irq;
|
|
char *name;
|
|
|
|
name = kasprintf(GFP_KERNEL, "sbs-%s", dev_name(&client->dev));
|
|
if (!name) {
|
|
dev_err(&client->dev, "Failed to allocate device name\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
chip = kzalloc(sizeof(struct sbs_info), GFP_KERNEL);
|
|
if (!chip) {
|
|
rc = -ENOMEM;
|
|
goto exit_free_name;
|
|
}
|
|
|
|
chip->client = client;
|
|
chip->enable_detection = false;
|
|
chip->gpio_detect = false;
|
|
chip->power_supply.name = name;
|
|
chip->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
chip->power_supply.properties = sbs_properties;
|
|
chip->power_supply.num_properties = ARRAY_SIZE(sbs_properties);
|
|
chip->power_supply.get_property = sbs_get_property;
|
|
chip->power_supply.of_node = client->dev.of_node;
|
|
/* ignore first notification of external change, it is generated
|
|
* from the power_supply_register call back
|
|
*/
|
|
chip->ignore_changes = 1;
|
|
chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
chip->power_supply.external_power_changed = sbs_external_power_changed;
|
|
|
|
pdata = sbs_of_populate_pdata(client);
|
|
|
|
if (pdata) {
|
|
chip->gpio_detect = gpio_is_valid(pdata->battery_detect);
|
|
chip->pdata = pdata;
|
|
}
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
if (!chip->gpio_detect)
|
|
goto skip_gpio;
|
|
|
|
rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
|
|
chip->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
rc = gpio_direction_input(pdata->battery_detect);
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
|
|
gpio_free(pdata->battery_detect);
|
|
chip->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
irq = gpio_to_irq(pdata->battery_detect);
|
|
if (irq <= 0) {
|
|
dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
|
|
gpio_free(pdata->battery_detect);
|
|
chip->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
rc = request_irq(irq, sbs_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
dev_name(&client->dev), &chip->power_supply);
|
|
if (rc) {
|
|
dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
|
|
gpio_free(pdata->battery_detect);
|
|
chip->gpio_detect = false;
|
|
goto skip_gpio;
|
|
}
|
|
|
|
chip->irq = irq;
|
|
|
|
skip_gpio:
|
|
/*
|
|
* Before we register, we need to make sure we can actually talk
|
|
* to the battery.
|
|
*/
|
|
rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
|
|
if (rc < 0) {
|
|
dev_err(&client->dev, "%s: Failed to get device status\n",
|
|
__func__);
|
|
goto exit_psupply;
|
|
}
|
|
|
|
rc = power_supply_register(&client->dev, &chip->power_supply);
|
|
if (rc) {
|
|
dev_err(&client->dev,
|
|
"%s: Failed to register power supply\n", __func__);
|
|
goto exit_psupply;
|
|
}
|
|
|
|
dev_info(&client->dev,
|
|
"%s: battery gas gauge device registered\n", client->name);
|
|
|
|
INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
|
|
|
|
chip->enable_detection = true;
|
|
|
|
return 0;
|
|
|
|
exit_psupply:
|
|
if (chip->irq)
|
|
free_irq(chip->irq, &chip->power_supply);
|
|
if (chip->gpio_detect)
|
|
gpio_free(pdata->battery_detect);
|
|
|
|
kfree(chip);
|
|
|
|
exit_free_name:
|
|
kfree(name);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int sbs_remove(struct i2c_client *client)
|
|
{
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
|
|
if (chip->irq)
|
|
free_irq(chip->irq, &chip->power_supply);
|
|
if (chip->gpio_detect)
|
|
gpio_free(chip->pdata->battery_detect);
|
|
|
|
power_supply_unregister(&chip->power_supply);
|
|
|
|
cancel_delayed_work_sync(&chip->work);
|
|
|
|
kfree(chip->power_supply.name);
|
|
kfree(chip);
|
|
chip = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined CONFIG_PM_SLEEP
|
|
|
|
static int sbs_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct sbs_info *chip = i2c_get_clientdata(client);
|
|
s32 ret;
|
|
|
|
if (chip->poll_time > 0)
|
|
cancel_delayed_work_sync(&chip->work);
|
|
|
|
/* write to manufacturer access with sleep command */
|
|
ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
|
|
MANUFACTURER_ACCESS_SLEEP);
|
|
if (chip->is_present && ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
|
|
#define SBS_PM_OPS (&sbs_pm_ops)
|
|
|
|
#else
|
|
#define SBS_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id sbs_id[] = {
|
|
{ "bq20z75", 0 },
|
|
{ "sbs-battery", 1 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, sbs_id);
|
|
|
|
static struct i2c_driver sbs_battery_driver = {
|
|
.probe = sbs_probe,
|
|
.remove = sbs_remove,
|
|
.id_table = sbs_id,
|
|
.driver = {
|
|
.name = "sbs-battery",
|
|
.of_match_table = of_match_ptr(sbs_dt_ids),
|
|
.pm = SBS_PM_OPS,
|
|
},
|
|
};
|
|
module_i2c_driver(sbs_battery_driver);
|
|
|
|
MODULE_DESCRIPTION("SBS battery monitor driver");
|
|
MODULE_LICENSE("GPL");
|