linux/drivers/power/supply/sbs-charger.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

268 lines
6.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2016, Prodys S.L.
*
* 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;
}
static int sbs_check_state(struct sbs_info *chip)
{
unsigned int reg;
int ret;
ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &reg);
if (!ret && reg != chip->last_state) {
chip->last_state = reg;
power_supply_changed(chip->power_supply);
return 1;
}
return 0;
}
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));
}
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;
}
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;
}
static bool sbs_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case SBS_CHARGER_REG_STATUS:
return true;
}
return false;
}
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;
}
static int sbs_remove(struct i2c_client *client)
{
struct sbs_info *chip = i2c_get_clientdata(client);
cancel_delayed_work_sync(&chip->work);
return 0;
}
#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");