272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*
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* Copyright (c) 2016, Prodys S.L.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This adds support for sbs-charger compilant chips as defined here:
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* http://sbs-forum.org/specs/sbc110.pdf
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*
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* Implemetation based on sbs-battery.c
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/power_supply.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/regmap.h>
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#include <linux/of_gpio.h>
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#include <linux/bitops.h>
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#define SBS_CHARGER_REG_SPEC_INFO 0x11
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#define SBS_CHARGER_REG_STATUS 0x13
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#define SBS_CHARGER_REG_ALARM_WARNING 0x16
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#define SBS_CHARGER_STATUS_CHARGE_INHIBITED BIT(1)
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#define SBS_CHARGER_STATUS_RES_COLD BIT(9)
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#define SBS_CHARGER_STATUS_RES_HOT BIT(10)
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#define SBS_CHARGER_STATUS_BATTERY_PRESENT BIT(14)
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#define SBS_CHARGER_STATUS_AC_PRESENT BIT(15)
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#define SBS_CHARGER_POLL_TIME 500
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struct sbs_info {
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struct i2c_client *client;
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struct power_supply *power_supply;
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struct regmap *regmap;
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struct delayed_work work;
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unsigned int last_state;
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};
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static int sbs_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct sbs_info *chip = power_supply_get_drvdata(psy);
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unsigned int reg;
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reg = chip->last_state;
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switch (psp) {
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = !!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = !!(reg & SBS_CHARGER_STATUS_AC_PRESENT);
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break;
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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if (!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT))
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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else if (reg & SBS_CHARGER_STATUS_AC_PRESENT &&
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!(reg & SBS_CHARGER_STATUS_CHARGE_INHIBITED))
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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if (reg & SBS_CHARGER_STATUS_RES_COLD)
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val->intval = POWER_SUPPLY_HEALTH_COLD;
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if (reg & SBS_CHARGER_STATUS_RES_HOT)
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val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
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else
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int sbs_check_state(struct sbs_info *chip)
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{
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unsigned int reg;
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int ret;
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ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, ®);
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if (!ret && reg != chip->last_state) {
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chip->last_state = reg;
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power_supply_changed(chip->power_supply);
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return 1;
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}
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return 0;
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}
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static void sbs_delayed_work(struct work_struct *work)
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{
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struct sbs_info *chip = container_of(work, struct sbs_info, work.work);
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sbs_check_state(chip);
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schedule_delayed_work(&chip->work,
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msecs_to_jiffies(SBS_CHARGER_POLL_TIME));
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}
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static irqreturn_t sbs_irq_thread(int irq, void *data)
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{
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struct sbs_info *chip = data;
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int ret;
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ret = sbs_check_state(chip);
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return ret ? IRQ_HANDLED : IRQ_NONE;
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}
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static enum power_supply_property sbs_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_HEALTH,
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};
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static bool sbs_readable_reg(struct device *dev, unsigned int reg)
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{
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return reg >= SBS_CHARGER_REG_SPEC_INFO;
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}
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static bool sbs_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case SBS_CHARGER_REG_STATUS:
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return true;
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}
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return false;
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}
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static const struct regmap_config sbs_regmap = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = SBS_CHARGER_REG_ALARM_WARNING,
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.readable_reg = sbs_readable_reg,
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.volatile_reg = sbs_volatile_reg,
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.val_format_endian = REGMAP_ENDIAN_LITTLE, /* since based on SMBus */
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};
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static const struct power_supply_desc sbs_desc = {
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.name = "sbs-charger",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = sbs_properties,
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.num_properties = ARRAY_SIZE(sbs_properties),
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.get_property = sbs_get_property,
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};
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static int sbs_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct power_supply_config psy_cfg = {};
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struct sbs_info *chip;
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int ret, val;
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chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->client = client;
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psy_cfg.of_node = client->dev.of_node;
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psy_cfg.drv_data = chip;
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i2c_set_clientdata(client, chip);
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chip->regmap = devm_regmap_init_i2c(client, &sbs_regmap);
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if (IS_ERR(chip->regmap))
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return PTR_ERR(chip->regmap);
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/*
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* Before we register, we need to make sure we can actually talk
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* to the battery.
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*/
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ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &val);
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if (ret) {
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dev_err(&client->dev, "Failed to get device status\n");
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return ret;
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}
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chip->last_state = val;
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chip->power_supply = devm_power_supply_register(&client->dev, &sbs_desc,
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&psy_cfg);
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if (IS_ERR(chip->power_supply)) {
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dev_err(&client->dev, "Failed to register power supply\n");
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return PTR_ERR(chip->power_supply);
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}
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/*
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* The sbs-charger spec doesn't impose the use of an interrupt. So in
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* the case it wasn't provided we use polling in order get the charger's
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* status.
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*/
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if (client->irq) {
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ret = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, sbs_irq_thread,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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dev_name(&client->dev), chip);
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if (ret) {
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dev_err(&client->dev, "Failed to request irq, %d\n", ret);
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return ret;
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}
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} else {
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INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
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schedule_delayed_work(&chip->work,
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msecs_to_jiffies(SBS_CHARGER_POLL_TIME));
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}
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dev_info(&client->dev,
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"%s: smart charger device registered\n", client->name);
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return 0;
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}
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static int sbs_remove(struct i2c_client *client)
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{
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struct sbs_info *chip = i2c_get_clientdata(client);
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cancel_delayed_work_sync(&chip->work);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id sbs_dt_ids[] = {
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{ .compatible = "sbs,sbs-charger" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, sbs_dt_ids);
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#endif
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static const struct i2c_device_id sbs_id[] = {
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{ "sbs-charger", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, sbs_id);
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static struct i2c_driver sbs_driver = {
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.probe = sbs_probe,
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.remove = sbs_remove,
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.id_table = sbs_id,
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.driver = {
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.name = "sbs-charger",
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.of_match_table = of_match_ptr(sbs_dt_ids),
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},
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};
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module_i2c_driver(sbs_driver);
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MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
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MODULE_DESCRIPTION("SBS smart charger driver");
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MODULE_LICENSE("GPL v2");
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