Release 4.14 drivers/power/supply/sbs-charger.c
/*
* Copyright (c) 2016, Prodys S.L.
*
* 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 adds support for sbs-charger compilant chips as defined here:
* http://sbs-forum.org/specs/sbc110.pdf
*
* Implemetation based on sbs-battery.c
*/
#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/regmap.h>
#include <linux/of_gpio.h>
#include <linux/bitops.h>
#define SBS_CHARGER_REG_SPEC_INFO 0x11
#define SBS_CHARGER_REG_STATUS 0x13
#define SBS_CHARGER_REG_ALARM_WARNING 0x16
#define SBS_CHARGER_STATUS_CHARGE_INHIBITED BIT(1)
#define SBS_CHARGER_STATUS_RES_COLD BIT(9)
#define SBS_CHARGER_STATUS_RES_HOT BIT(10)
#define SBS_CHARGER_STATUS_BATTERY_PRESENT BIT(14)
#define SBS_CHARGER_STATUS_AC_PRESENT BIT(15)
#define SBS_CHARGER_POLL_TIME 500
struct sbs_info {
struct i2c_client *client;
struct power_supply *power_supply;
struct regmap *regmap;
struct delayed_work work;
unsigned int last_state;
};
static int sbs_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct sbs_info *chip = power_supply_get_drvdata(psy);
unsigned int reg;
reg = chip->last_state;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
val->intval = !!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT);
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = !!(reg & SBS_CHARGER_STATUS_AC_PRESENT);
break;
case POWER_SUPPLY_PROP_STATUS:
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
if (!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT))
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
else if (reg & SBS_CHARGER_STATUS_AC_PRESENT &&
!(reg & SBS_CHARGER_STATUS_CHARGE_INHIBITED))
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case POWER_SUPPLY_PROP_HEALTH:
if (reg & SBS_CHARGER_STATUS_RES_COLD)
val->intval = POWER_SUPPLY_HEALTH_COLD;
if (reg & SBS_CHARGER_STATUS_RES_HOT)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
default:
return -EINVAL;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 173 | 100.00% | 1 | 100.00% |
| Total | 173 | 100.00% | 1 | 100.00% |
static int sbs_check_state(struct sbs_info *chip)
{
unsigned int reg;
int ret;
ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, ®);
if (!ret && reg != chip->last_state) {
chip->last_state = reg;
power_supply_changed(chip->power_supply);
return 1;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 64 | 100.00% | 1 | 100.00% |
| Total | 64 | 100.00% | 1 | 100.00% |
static void sbs_delayed_work(struct work_struct *work)
{
struct sbs_info *chip = container_of(work, struct sbs_info, work.work);
sbs_check_state(chip);
schedule_delayed_work(&chip->work,
msecs_to_jiffies(SBS_CHARGER_POLL_TIME));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 46 | 100.00% | 1 | 100.00% |
| Total | 46 | 100.00% | 1 | 100.00% |
static irqreturn_t sbs_irq_thread(int irq, void *data)
{
struct sbs_info *chip = data;
int ret;
ret = sbs_check_state(chip);
return ret ? IRQ_HANDLED : IRQ_NONE;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 37 | 100.00% | 1 | 100.00% |
| Total | 37 | 100.00% | 1 | 100.00% |
static enum power_supply_property sbs_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_HEALTH,
};
static bool sbs_readable_reg(struct device *dev, unsigned int reg)
{
return reg >= SBS_CHARGER_REG_SPEC_INFO;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 18 | 90.00% | 1 | 50.00% |
| Daniel Perez De Andres | 2 | 10.00% | 1 | 50.00% |
| Total | 20 | 100.00% | 2 | 100.00% |
static bool sbs_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case SBS_CHARGER_REG_STATUS:
return true;
}
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
static const struct regmap_config sbs_regmap = {
.reg_bits = 8,
.val_bits = 16,
.max_register = SBS_CHARGER_REG_ALARM_WARNING,
.readable_reg = sbs_readable_reg,
.volatile_reg = sbs_volatile_reg,
.val_format_endian = REGMAP_ENDIAN_LITTLE, /* since based on SMBus */
};
static const struct power_supply_desc sbs_desc = {
.name = "sbs-charger",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = sbs_properties,
.num_properties = ARRAY_SIZE(sbs_properties),
.get_property = sbs_get_property,
};
static int sbs_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct power_supply_config psy_cfg = {};
struct sbs_info *chip;
int ret, val;
chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
psy_cfg.of_node = client->dev.of_node;
psy_cfg.drv_data = chip;
i2c_set_clientdata(client, chip);
chip->regmap = devm_regmap_init_i2c(client, &sbs_regmap);
if (IS_ERR(chip->regmap))
return PTR_ERR(chip->regmap);
/*
* Before we register, we need to make sure we can actually talk
* to the battery.
*/
ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &val);
if (ret) {
dev_err(&client->dev, "Failed to get device status\n");
return ret;
}
chip->last_state = val;
chip->power_supply = devm_power_supply_register(&client->dev, &sbs_desc,
&psy_cfg);
if (IS_ERR(chip->power_supply)) {
dev_err(&client->dev, "Failed to register power supply\n");
return PTR_ERR(chip->power_supply);
}
/*
* The sbs-charger spec doesn't impose the use of an interrupt. So in
* the case it wasn't provided we use polling in order get the charger's
* status.
*/
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, sbs_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
dev_name(&client->dev), chip);
if (ret) {
dev_err(&client->dev, "Failed to request irq, %d\n", ret);
return ret;
}
} else {
INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
schedule_delayed_work(&chip->work,
msecs_to_jiffies(SBS_CHARGER_POLL_TIME));
}
dev_info(&client->dev,
"%s: smart charger device registered\n", client->name);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 310 | 100.00% | 1 | 100.00% |
| Total | 310 | 100.00% | 1 | 100.00% |
static int sbs_remove(struct i2c_client *client)
{
struct sbs_info *chip = i2c_get_clientdata(client);
cancel_delayed_work_sync(&chip->work);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
#ifdef CONFIG_OF
static const struct of_device_id sbs_dt_ids[] = {
{ .compatible = "sbs,sbs-charger" },
{ },
};
MODULE_DEVICE_TABLE(of, sbs_dt_ids);
#endif
static const struct i2c_device_id sbs_id[] = {
{ "sbs-charger", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, sbs_id);
static struct i2c_driver sbs_driver = {
.probe = sbs_probe,
.remove = sbs_remove,
.id_table = sbs_id,
.driver = {
.name = "sbs-charger",
.of_match_table = of_match_ptr(sbs_dt_ids),
},
};
module_i2c_driver(sbs_driver);
MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
MODULE_DESCRIPTION("SBS smart charger driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicolas Saenz Julienne | 1017 | 99.80% | 1 | 50.00% |
| Daniel Perez De Andres | 2 | 0.20% | 1 | 50.00% |
| Total | 1019 | 100.00% | 2 | 100.00% |
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