/*
* Driver for batteries with DS2760 chips inside.
*
* Copyright © 2007 Anton Vorontsov
* 2004-2007 Matt Reimer
* 2004 Szabolcs Gyurko
*
* Use consistent with the GNU GPL is permitted,
* provided that this copyright notice is
* preserved in its entirety in all copies and derived works.
*
* Author: Anton Vorontsov <[email protected]>
* February 2007
*
* Matt Reimer <[email protected]>
* April 2004, 2005, 2007
*
* Szabolcs Gyurko <[email protected]>
* September 2004
*/
#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/suspend.h>
#include <linux/w1.h>
#include <linux/of.h>
static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
static bool pmod_enabled;
module_param(pmod_enabled, bool, 0644);
MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");
static unsigned int rated_capacity;
module_param(rated_capacity, uint, 0644);
MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
static unsigned int current_accum;
module_param(current_accum, uint, 0644);
MODULE_PARM_DESC(current_accum, "current accumulator value");
#define W1_FAMILY_DS2760 0x30
/* Known commands to the DS2760 chip */
#define W1_DS2760_SWAP 0xAA
#define W1_DS2760_READ_DATA 0x69
#define W1_DS2760_WRITE_DATA 0x6C
#define W1_DS2760_COPY_DATA 0x48
#define W1_DS2760_RECALL_DATA 0xB8
#define W1_DS2760_LOCK 0x6A
/* Number of valid register addresses */
#define DS2760_DATA_SIZE 0x40
#define DS2760_PROTECTION_REG 0x00
#define DS2760_STATUS_REG 0x01
#define DS2760_STATUS_IE (1 << 2)
#define DS2760_STATUS_SWEN (1 << 3)
#define DS2760_STATUS_RNAOP (1 << 4)
#define DS2760_STATUS_PMOD (1 << 5)
#define DS2760_EEPROM_REG 0x07
#define DS2760_SPECIAL_FEATURE_REG 0x08
#define DS2760_VOLTAGE_MSB 0x0c
#define DS2760_VOLTAGE_LSB 0x0d
#define DS2760_CURRENT_MSB 0x0e
#define DS2760_CURRENT_LSB 0x0f
#define DS2760_CURRENT_ACCUM_MSB 0x10
#define DS2760_CURRENT_ACCUM_LSB 0x11
#define DS2760_TEMP_MSB 0x18
#define DS2760_TEMP_LSB 0x19
#define DS2760_EEPROM_BLOCK0 0x20
#define DS2760_ACTIVE_FULL 0x20
#define DS2760_EEPROM_BLOCK1 0x30
#define DS2760_STATUS_WRITE_REG 0x31
#define DS2760_RATED_CAPACITY 0x32
#define DS2760_CURRENT_OFFSET_BIAS 0x33
#define DS2760_ACTIVE_EMPTY 0x3b
struct ds2760_device_info {
struct device *dev;
/* DS2760 data, valid after calling ds2760_battery_read_status() */
unsigned long update_time; /* jiffies when data read */
char raw[DS2760_DATA_SIZE]; /* raw DS2760 data */
int voltage_raw; /* units of 4.88 mV */
int voltage_uV; /* units of µV */
int current_raw; /* units of 0.625 mA */
int current_uA; /* units of µA */
int accum_current_raw; /* units of 0.25 mAh */
int accum_current_uAh; /* units of µAh */
int temp_raw; /* units of 0.125 °C */
int temp_C; /* units of 0.1 °C */
int rated_capacity; /* units of µAh */
int rem_capacity; /* percentage */
int full_active_uAh; /* units of µAh */
int empty_uAh; /* units of µAh */
int life_sec; /* units of seconds */
int charge_status; /* POWER_SUPPLY_STATUS_* */
int full_counter;
struct power_supply *bat;
struct power_supply_desc bat_desc;
struct workqueue_struct *monitor_wqueue;
struct delayed_work monitor_work;
struct delayed_work set_charged_work;
struct notifier_block pm_notifier;
};
static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
int io)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
if (!dev)
return 0;
mutex_lock(&sl->master->bus_mutex);
if (addr > DS2760_DATA_SIZE || addr < 0) {
count = 0;
goto out;
}
if (addr + count > DS2760_DATA_SIZE)
count = DS2760_DATA_SIZE - addr;
if (!w1_reset_select_slave(sl)) {
if (!io) {
w1_write_8(sl->master, W1_DS2760_READ_DATA);
w1_write_8(sl->master, addr);
count = w1_read_block(sl->master, buf, count);
} else {
w1_write_8(sl->master, W1_DS2760_WRITE_DATA);
w1_write_8(sl->master, addr);
w1_write_block(sl->master, buf, count);
/* XXX w1_write_block returns void, not n_written */
}
}
out:
mutex_unlock(&sl->master->bus_mutex);
return count;
}
static int w1_ds2760_read(struct device *dev,
char *buf, int addr,
size_t count)
{
return w1_ds2760_io(dev, buf, addr, count, 0);
}
static int w1_ds2760_write(struct device *dev,
char *buf,
int addr, size_t count)
{
return w1_ds2760_io(dev, buf, addr, count, 1);
}
static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
if (!dev)
return -EINVAL;
mutex_lock(&sl->master->bus_mutex);
if (w1_reset_select_slave(sl) == 0) {
w1_write_8(sl->master, cmd);
w1_write_8(sl->master, addr);
}
mutex_unlock(&sl->master->bus_mutex);
return 0;
}
static int w1_ds2760_store_eeprom(struct device *dev, int addr)
{
return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);
}
static int w1_ds2760_recall_eeprom(struct device *dev, int addr)
{
return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);
}
static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t off, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
return w1_ds2760_read(dev, buf, off, count);
}
static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
static struct bin_attribute *w1_ds2760_bin_attrs[] = {
&bin_attr_w1_slave,
NULL,
};
static const struct attribute_group w1_ds2760_group = {
.bin_attrs = w1_ds2760_bin_attrs,
};
static const struct attribute_group *w1_ds2760_groups[] = {
&w1_ds2760_group,
NULL,
};
/* Some batteries have their rated capacity stored a N * 10 mAh, while
* others use an index into this table. */
static int rated_capacities[] = {
0,
920, /* Samsung */
920, /* BYD */
920, /* Lishen */
920, /* NEC */
1440, /* Samsung */
1440, /* BYD */
1440, /* Lishen */
1440, /* NEC */
2880, /* Samsung */
2880, /* BYD */
2880, /* Lishen */
2880, /* NEC */
};
/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
* temp is in Celsius */
static int battery_interpolate(int array[], int temp)
{
int index, dt;
if (temp <= 0)
return array[0];
if (temp >= 40)
return array[4];
index = temp / 10;
dt = temp % 10;
return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
}
static int ds2760_battery_read_status(struct ds2760_device_info *di)
{
int ret, i, start, count, scale[5];
if (di->update_time && time_before(jiffies, di->update_time +
msecs_to_jiffies(cache_time)))
return 0;
/* The first time we read the entire contents of SRAM/EEPROM,
* but after that we just read the interesting bits that change. */
if (di->update_time == 0) {
start = 0;
count = DS2760_DATA_SIZE;
} else {
start = DS2760_VOLTAGE_MSB;
count = DS2760_TEMP_LSB - start + 1;
}
ret = w1_ds2760_read(di->dev, di->raw + start, start, count);
if (ret != count) {
dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
di->dev);
return 1;
}
di->update_time = jiffies;
/* DS2760 reports voltage in units of 4.88mV, but the battery class
* reports in units of uV, so convert by multiplying by 4880. */
di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) |
(di->raw[DS2760_VOLTAGE_LSB] >> 5);
di->voltage_uV = di->voltage_raw * 4880;
/* DS2760 reports current in signed units of 0.625mA, but the battery
* class reports in units of µA, so convert by multiplying by 625. */
di->current_raw =
(((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) |
(di->raw[DS2760_CURRENT_LSB] >> 3);
di->current_uA = di->current_raw * 625;
/* DS2760 reports accumulated current in signed units of 0.25mAh. */
di->accum_current_raw =
(((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) |
di->raw[DS2760_CURRENT_ACCUM_LSB];
di->accum_current_uAh = di->accum_current_raw * 250;
/* DS2760 reports temperature in signed units of 0.125°C, but the
* battery class reports in units of 1/10 °C, so we convert by
* multiplying by .125 * 10 = 1.25. */
di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) |
(di->raw[DS2760_TEMP_LSB] >> 5);
di->temp_C = di->temp_raw + (di->temp_raw / 4);
/* At least some battery monitors (e.g. HP iPAQ) store the battery's
* maximum rated capacity. */
if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
di->rated_capacity = rated_capacities[
(unsigned int)di->raw[DS2760_RATED_CAPACITY]];
else
di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
di->rated_capacity *= 1000; /* convert to µAh */
/* Calculate the full level at the present temperature. */
di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
di->raw[DS2760_ACTIVE_FULL + 1];
/* If the full_active_uAh value is not given, fall back to the rated
* capacity. This is likely to happen when chips are not part of the
* battery pack and is therefore not bootstrapped. */
if (di->full_active_uAh == 0)
di->full_active_uAh = di->rated_capacity / 1000L;
scale[0] = di->full_active_uAh;
for (i = 1; i < 5; i++)
scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i];
di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
di->full_active_uAh *= 1000; /* convert to µAh */
/* Calculate the empty level at the present temperature. */
scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
for (i = 3; i >= 0; i--)
scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];
di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
di->empty_uAh *= 1000; /* convert to µAh */
if (di->full_active_uAh == di->empty_uAh)
di->rem_capacity = 0;
else
/* From Maxim Application Note 131: remaining capacity =
* ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
(di->full_active_uAh - di->empty_uAh);
if (di->rem_capacity < 0)
di->rem_capacity = 0;
if (di->rem_capacity > 100)
di->rem_capacity = 100;
if (di->current_uA < -100L)
di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
/ (di->current_uA / 100L);
else
di->life_sec = 0;
return 0;
}
static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
unsigned int acr_val)
{
unsigned char acr[2];
/* acr is in units of 0.25 mAh */
acr_val *= 4L;
acr_val /= 1000;
acr[0] = acr_val >> 8;
acr[1] = acr_val & 0xff;
if (w1_ds2760_write(di->dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
dev_warn(di->dev, "ACR write failed\n");
}
static void ds2760_battery_update_status(struct ds2760_device_info *di)
{
int old_charge_status = di->charge_status;
ds2760_battery_read_status(di);
if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
di->full_counter = 0;
if (power_supply_am_i_supplied(di->bat)) {
if (di->current_uA > 10000) {
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
di->full_counter = 0;
} else if (di->current_uA < -5000) {
if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
dev_notice(di->dev, "not enough power to "
"charge\n");
di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
di->full_counter = 0;
} else if (di->current_uA < 10000 &&
di->charge_status != POWER_SUPPLY_STATUS_FULL) {
/* Don't consider the battery to be full unless
* we've seen the current < 10 mA at least two
* consecutive times. */
di->full_counter++;
if (di->full_counter < 2) {
di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
} else {
di->charge_status = POWER_SUPPLY_STATUS_FULL;
ds2760_battery_set_current_accum(di,
di->full_active_uAh);
}
}
} else {
di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
di->full_counter = 0;
}
if (di->charge_status != old_charge_status)
power_supply_changed(di->bat);
}
static void ds2760_battery_write_status(struct ds2760_device_info *di,
char status)
{
if (status == di->raw[DS2760_STATUS_REG])
return;
w1_ds2760_write(di->dev, &status, DS2760_STATUS_WRITE_REG, 1);
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
}
static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
unsigned char rated_capacity)
{
if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
return;
w1_ds2760_write(di->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
}
static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
int active_full)
{
unsigned char tmp[2] = {
active_full >> 8,
active_full & 0xff
};
if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] &&
tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
return;
w1_ds2760_write(di->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0);
w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK0);
/* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
* values won't be read back by ds2760_battery_read_status() */
di->raw[DS2760_ACTIVE_FULL] = tmp[0];
di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1];
}
static void ds2760_battery_work(struct work_struct *work)
{
struct ds2760_device_info *di = container_of(work,
struct ds2760_device_info, monitor_work.work);
const int interval = HZ * 60;
dev_dbg(di->dev, "%s\n", __func__);
ds2760_battery_update_status(di);
queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
}
static void ds2760_battery_external_power_changed(struct power_supply *psy)
{
struct ds2760_device_info *di = power_supply_get_drvdata(psy);
dev_dbg(di->dev, "%s\n", __func__);
mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
}
static void ds2760_battery_set_charged_work(struct work_struct *work)
{
char bias;
struct ds2760_device_info *di = container_of(work,
struct ds2760_device_info, set_charged_work.work);
dev_dbg(di->dev, "%s\n", __func__);
ds2760_battery_read_status(di);
/* When we get notified by external circuitry that the battery is
* considered fully charged now, we know that there is no current
* flow any more. However, the ds2760's internal current meter is
* too inaccurate to rely on - spec say something ~15% failure.
* Hence, we use the current offset bias register to compensate
* that error.
*/
if (!power_supply_am_i_supplied(di->bat))
return;
bias = (signed char) di->current_raw +
(signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];
dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
w1_ds2760_write(di->dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
/* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
* value won't be read back by ds2760_battery_read_status() */
di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
}
static void ds2760_battery_set_charged(struct power_supply *psy)
{
struct ds2760_device_info *di = power_supply_get_drvdata(psy);
/* postpone the actual work by 20 secs. This is for debouncing GPIO
* signals and to let the current value settle. See AN4188. */
mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
}
static int ds2760_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ds2760_device_info *di = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = di->charge_status;
return 0;
default:
break;
}
ds2760_battery_read_status(di);
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = di->voltage_uV;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = di->current_uA;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval = di->rated_capacity;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = di->full_active_uAh;
break;
case POWER_SUPPLY_PROP_CHARGE_EMPTY:
val->intval = di->empty_uAh;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = di->accum_current_uAh;
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = di->temp_C;
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
val->intval = di->life_sec;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = di->rem_capacity;
break;
default:
return -EINVAL;
}
return 0;
}
static int ds2760_battery_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct ds2760_device_info *di = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_FULL:
/* the interface counts in uAh, convert the value */
ds2760_battery_write_active_full(di, val->intval / 1000L);
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
/* ds2760_battery_set_current_accum() does the conversion */
ds2760_battery_set_current_accum(di, val->intval);
break;
default:
return -EPERM;
}
return 0;
}
static int ds2760_battery_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_CHARGE_NOW:
return 1;
default:
break;
}
return 0;
}
static enum power_supply_property ds2760_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_EMPTY,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_CAPACITY,
};
static int ds2760_pm_notifier(struct notifier_block *notifier,
unsigned long pm_event,
void *unused)
{
struct ds2760_device_info *di =
container_of(notifier, struct ds2760_device_info, pm_notifier);
switch (pm_event) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
break;
case PM_POST_RESTORE:
case PM_POST_HIBERNATION:
case PM_POST_SUSPEND:
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
power_supply_changed(di->bat);
mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
break;
case PM_RESTORE_PREPARE:
default:
break;
}
return NOTIFY_DONE;
}
static int w1_ds2760_add_slave(struct w1_slave *sl)
{
struct power_supply_config psy_cfg = {};
struct ds2760_device_info *di;
struct device *dev = &sl->dev;
int retval = 0;
char name[32];
char status;
di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
if (!di) {
retval = -ENOMEM;
goto di_alloc_failed;
}
snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id);
di->dev = dev;
di->bat_desc.name = name;
di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
di->bat_desc.properties = ds2760_battery_props;
di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props);
di->bat_desc.get_property = ds2760_battery_get_property;
di->bat_desc.set_property = ds2760_battery_set_property;
di->bat_desc.property_is_writeable =
ds2760_battery_property_is_writeable;
di->bat_desc.set_charged = ds2760_battery_set_charged;
di->bat_desc.external_power_changed =
ds2760_battery_external_power_changed;
psy_cfg.drv_data = di;
if (dev->of_node) {
u32 tmp;
psy_cfg.of_node = dev->of_node;
if (!of_property_read_bool(dev->of_node, "maxim,pmod-enabled"))
pmod_enabled = true;
if (!of_property_read_u32(dev->of_node,
"maxim,cache-time-ms", &tmp))
cache_time = tmp;
if (!of_property_read_u32(dev->of_node,
"rated-capacity-microamp-hours",
&tmp))
rated_capacity = tmp / 10; /* property is in mAh */
}
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
sl->family_data = di;
/* enable sleep mode feature */
ds2760_battery_read_status(di);
status = di->raw[DS2760_STATUS_REG];
if (pmod_enabled)
status |= DS2760_STATUS_PMOD;
else
status &= ~DS2760_STATUS_PMOD;
ds2760_battery_write_status(di, status);
/* set rated capacity from module param or device tree */
if (rated_capacity)
ds2760_battery_write_rated_capacity(di, rated_capacity);
/* set current accumulator if given as parameter.
* this should only be done for bootstrapping the value */
if (current_accum)
ds2760_battery_set_current_accum(di, current_accum);
di->bat = devm_power_supply_register(dev, &di->bat_desc, &psy_cfg);
if (IS_ERR(di->bat)) {
dev_err(di->dev, "failed to register battery\n");
retval = PTR_ERR(di->bat);
goto batt_failed;
}
INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
INIT_DELAYED_WORK(&di->set_charged_work,
ds2760_battery_set_charged_work);
di->monitor_wqueue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
if (!di->monitor_wqueue) {
retval = -ESRCH;
goto workqueue_failed;
}
queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
di->pm_notifier.notifier_call = ds2760_pm_notifier;
register_pm_notifier(&di->pm_notifier);
goto success;
workqueue_failed:
batt_failed:
di_alloc_failed:
success:
return retval;
}
static void w1_ds2760_remove_slave(struct w1_slave *sl)
{
struct ds2760_device_info *di = sl->family_data;
unregister_pm_notifier(&di->pm_notifier);
cancel_delayed_work_sync(&di->monitor_work);
cancel_delayed_work_sync(&di->set_charged_work);
destroy_workqueue(di->monitor_wqueue);
}
#ifdef CONFIG_OF
static const struct of_device_id w1_ds2760_of_ids[] = {
{ .compatible = "maxim,ds2760" },
{}
};
#endif
static const struct w1_family_ops w1_ds2760_fops = {
.add_slave = w1_ds2760_add_slave,
.remove_slave = w1_ds2760_remove_slave,
.groups = w1_ds2760_groups,
};
static struct w1_family w1_ds2760_family = {
.fid = W1_FAMILY_DS2760,
.fops = &w1_ds2760_fops,
.of_match_table = of_match_ptr(w1_ds2760_of_ids),
};
module_w1_family(w1_ds2760_family);
MODULE_AUTHOR("Szabolcs Gyurko <[email protected]>, "
"Matt Reimer <[email protected]>, "
"Anton Vorontsov <[email protected]>");
MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));
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