/* * Battery charger driver for TI's tps65217 * * Copyright (c) 2015, Collabora Ltd. * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ /* * Battery charger driver for TI's tps65217 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define POLL_INTERVAL (HZ * 2) struct tps65217_charger { struct tps65217 *tps; struct device *dev; struct power_supply *ac; int ac_online; int prev_ac_online; struct task_struct *poll_task; }; static enum power_supply_property tps65217_ac_props[] = { POWER_SUPPLY_PROP_ONLINE, }; static int tps65217_config_charger(struct tps65217_charger *charger) { int ret; dev_dbg(charger->dev, "%s\n", __func__); /* * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic) * * The device can be configured to support a 100k NTC (B = 3960) by * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it * is not recommended to do so. In sleep mode, the charger continues * charging the battery, but all register values are reset to default * values. Therefore, the charger would get the wrong temperature * information. If 100k NTC setting is required, please contact the * factory. * * ATTENTION, conflicting information, from p. 46 * * NTC TYPE (for battery temperature measurement) * 0 – 100k (curve 1, B = 3960) * 1 – 10k (curve 2, B = 3480) (default on reset) * */ ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1, TPS65217_CHGCONFIG1_NTC_TYPE, TPS65217_PROTECT_NONE); if (ret) { dev_err(charger->dev, "failed to set 100k NTC setting: %d\n", ret); return ret; } return 0; } static int tps65217_enable_charging(struct tps65217_charger *charger) { int ret; /* charger already enabled */ if (charger->ac_online) return 0; dev_dbg(charger->dev, "%s: enable charging\n", __func__); ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1, TPS65217_CHGCONFIG1_CHG_EN, TPS65217_CHGCONFIG1_CHG_EN, TPS65217_PROTECT_NONE); if (ret) { dev_err(charger->dev, "%s: Error in writing CHG_EN in reg 0x%x: %d\n", __func__, TPS65217_REG_CHGCONFIG1, ret); return ret; } charger->ac_online = 1; return 0; } static int tps65217_ac_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct tps65217_charger *charger = power_supply_get_drvdata(psy); if (psp == POWER_SUPPLY_PROP_ONLINE) { val->intval = charger->ac_online; return 0; } return -EINVAL; } static irqreturn_t tps65217_charger_irq(int irq, void *dev) { int ret, val; struct tps65217_charger *charger = dev; charger->prev_ac_online = charger->ac_online; ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val); if (ret < 0) { dev_err(charger->dev, "%s: Error in reading reg 0x%x\n", __func__, TPS65217_REG_STATUS); return IRQ_HANDLED; } dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val); /* check for AC status bit */ if (val & TPS65217_STATUS_ACPWR) { ret = tps65217_enable_charging(charger); if (ret) { dev_err(charger->dev, "failed to enable charger: %d\n", ret); return IRQ_HANDLED; } } else { charger->ac_online = 0; } if (charger->prev_ac_online != charger->ac_online) power_supply_changed(charger->ac); ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val); if (ret < 0) { dev_err(charger->dev, "%s: Error in reading reg 0x%x\n", __func__, TPS65217_REG_CHGCONFIG0); return IRQ_HANDLED; } if (val & TPS65217_CHGCONFIG0_ACTIVE) dev_dbg(charger->dev, "%s: charger is charging\n", __func__); else dev_dbg(charger->dev, "%s: charger is NOT charging\n", __func__); return IRQ_HANDLED; } static int tps65217_charger_poll_task(void *data) { set_freezable(); while (!kthread_should_stop()) { schedule_timeout_interruptible(POLL_INTERVAL); try_to_freeze(); tps65217_charger_irq(-1, data); } return 0; } static const struct power_supply_desc tps65217_charger_desc = { .name = "tps65217-ac", .type = POWER_SUPPLY_TYPE_MAINS, .get_property = tps65217_ac_get_property, .properties = tps65217_ac_props, .num_properties = ARRAY_SIZE(tps65217_ac_props), }; static int tps65217_charger_probe(struct platform_device *pdev) { struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent); struct tps65217_charger *charger; int ret; dev_dbg(&pdev->dev, "%s\n", __func__); charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); if (!charger) return -ENOMEM; charger->tps = tps; charger->dev = &pdev->dev; charger->ac = devm_power_supply_register(&pdev->dev, &tps65217_charger_desc, NULL); if (IS_ERR(charger->ac)) { dev_err(&pdev->dev, "failed: power supply register\n"); return PTR_ERR(charger->ac); } ret = tps65217_config_charger(charger); if (ret < 0) { dev_err(charger->dev, "charger config failed, err %d\n", ret); return ret; } charger->poll_task = kthread_run(tps65217_charger_poll_task, charger, "ktps65217charger"); if (IS_ERR(charger->poll_task)) { ret = PTR_ERR(charger->poll_task); dev_err(charger->dev, "Unable to run kthread err %d\n", ret); return ret; } return 0; } static int tps65217_charger_remove(struct platform_device *pdev) { struct tps65217_charger *charger = platform_get_drvdata(pdev); kthread_stop(charger->poll_task); return 0; } static const struct of_device_id tps65217_charger_match_table[] = { { .compatible = "ti,tps65217-charger", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, tps65217_charger_match_table); static struct platform_driver tps65217_charger_driver = { .probe = tps65217_charger_probe, .remove = tps65217_charger_remove, .driver = { .name = "tps65217-charger", .of_match_table = of_match_ptr(tps65217_charger_match_table), }, }; module_platform_driver(tps65217_charger_driver); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Enric Balletbo Serra "); MODULE_DESCRIPTION("TPS65217 battery charger driver");