// SPDX-License-Identifier: GPL-2.0 // Battery charger driver for TI's tps65217 // // Copyright (C) 2015 Collabora Ltd. // Author: Enric Balletbo i Serra /* * Battery charger driver for TI's tps65217 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define CHARGER_STATUS_PRESENT (TPS65217_STATUS_ACPWR | TPS65217_STATUS_USBPWR) #define NUM_CHARGER_IRQS 2 #define POLL_INTERVAL (HZ * 2) struct tps65217_charger { struct tps65217 *tps; struct device *dev; struct power_supply *psy; int online; int prev_online; struct task_struct *poll_task; }; static enum power_supply_property tps65217_charger_props[] = { POWER_SUPPLY_PROP_ONLINE, }; static int tps65217_config_charger(struct tps65217_charger *charger) { int ret; /* * 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 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->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->online = 1; return 0; } static int tps65217_charger_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->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_online = charger->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 charger status bit */ if (val & CHARGER_STATUS_PRESENT) { ret = tps65217_enable_charging(charger); if (ret) { dev_err(charger->dev, "failed to enable charger: %d\n", ret); return IRQ_HANDLED; } } else { charger->online = 0; } if (charger->prev_online != charger->online) power_supply_changed(charger->psy); 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-charger", .type = POWER_SUPPLY_TYPE_MAINS, .get_property = tps65217_charger_get_property, .properties = tps65217_charger_props, .num_properties = ARRAY_SIZE(tps65217_charger_props), }; static int tps65217_charger_probe(struct platform_device *pdev) { struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent); struct tps65217_charger *charger; struct power_supply_config cfg = {}; struct task_struct *poll_task; int irq[NUM_CHARGER_IRQS]; int ret; int i; charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); if (!charger) return -ENOMEM; platform_set_drvdata(pdev, charger); charger->tps = tps; charger->dev = &pdev->dev; cfg.of_node = pdev->dev.of_node; cfg.drv_data = charger; charger->psy = devm_power_supply_register(&pdev->dev, &tps65217_charger_desc, &cfg); if (IS_ERR(charger->psy)) { dev_err(&pdev->dev, "failed: power supply register\n"); return PTR_ERR(charger->psy); } irq[0] = platform_get_irq_byname(pdev, "USB"); irq[1] = platform_get_irq_byname(pdev, "AC"); ret = tps65217_config_charger(charger); if (ret < 0) { dev_err(charger->dev, "charger config failed, err %d\n", ret); return ret; } /* Create a polling thread if an interrupt is invalid */ if (irq[0] < 0 || irq[1] < 0) { poll_task = kthread_run(tps65217_charger_poll_task, charger, "ktps65217charger"); if (IS_ERR(poll_task)) { ret = PTR_ERR(poll_task); dev_err(charger->dev, "Unable to run kthread err %d\n", ret); return ret; } charger->poll_task = poll_task; return 0; } /* Create IRQ threads for charger interrupts */ for (i = 0; i < NUM_CHARGER_IRQS; i++) { ret = devm_request_threaded_irq(&pdev->dev, irq[i], NULL, tps65217_charger_irq, IRQF_SHARED, "tps65217-charger", charger); if (ret) { dev_err(charger->dev, "Unable to register irq %d err %d\n", irq[i], ret); return ret; } /* Check current state */ tps65217_charger_irq(-1, charger); } return 0; } static void tps65217_charger_remove(struct platform_device *pdev) { struct tps65217_charger *charger = platform_get_drvdata(pdev); if (charger->poll_task) kthread_stop(charger->poll_task); } 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");