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259 lines
6.2 KiB
259 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2016, Prodys S.L. |
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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/regmap.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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return dev_err_probe(&client->dev, ret, "Failed to get device status\n"); |
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chip->last_state = val; |
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chip->power_supply = devm_power_supply_register(&client->dev, &sbs_desc, &psy_cfg); |
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if (IS_ERR(chip->power_supply)) |
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return dev_err_probe(&client->dev, PTR_ERR(chip->power_supply), |
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"Failed to register power supply\n"); |
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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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return dev_err_probe(&client->dev, ret, "Failed to request irq\n"); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("SBS smart charger driver"); |
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MODULE_LICENSE("GPL v2");
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