// SPDX-License-Identifier: GPL-2.0-only /* * MFD core driver for Ricoh RN5T618 PMIC * * Copyright (C) 2014 Beniamino Galvani * Copyright (C) 2016 Toradex AG */ #include #include #include #include #include #include #include #include #include #include #include static const struct mfd_cell rn5t618_cells[] = { { .name = "rn5t618-regulator" }, { .name = "rn5t618-wdt" }, }; static const struct mfd_cell rc5t619_cells[] = { { .name = "rn5t618-adc" }, { .name = "rn5t618-power" }, { .name = "rn5t618-regulator" }, { .name = "rc5t619-rtc" }, { .name = "rn5t618-wdt" }, }; static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case RN5T618_WATCHDOGCNT: case RN5T618_DCIRQ: case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL: case RN5T618_ADCCNT3: case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3: case RN5T618_IR_GPR: case RN5T618_IR_GPF: case RN5T618_MON_IOIN: case RN5T618_INTMON: case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2: case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR: case RN5T618_CHGCTL1: case RN5T618_REGISET1 ... RN5T618_REGISET2: case RN5T618_CHGSTATE: case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI: case RN5T618_GCHGDET: case RN5T618_CONTROL ... RN5T618_CC_AVEREG0: return true; default: return false; } } static const struct regmap_config rn5t618_regmap_config = { .reg_bits = 8, .val_bits = 8, .volatile_reg = rn5t618_volatile_reg, .max_register = RN5T618_MAX_REG, .cache_type = REGCACHE_RBTREE, }; static const struct regmap_irq rc5t619_irqs[] = { REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)), REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)), REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)), REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)), REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)), REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)), }; static const struct regmap_irq_chip rc5t619_irq_chip = { .name = "rc5t619", .irqs = rc5t619_irqs, .num_irqs = ARRAY_SIZE(rc5t619_irqs), .num_regs = 1, .status_base = RN5T618_INTMON, .mask_base = RN5T618_INTEN, .mask_invert = true, }; static struct i2c_client *rn5t618_pm_power_off; static struct notifier_block rn5t618_restart_handler; static int rn5t618_irq_init(struct rn5t618 *rn5t618) { const struct regmap_irq_chip *irq_chip = NULL; int ret; if (!rn5t618->irq) return 0; switch (rn5t618->variant) { case RC5T619: irq_chip = &rc5t619_irq_chip; break; default: dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n", (int)rn5t618->variant); return -ENOENT; } ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap, rn5t618->irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0, irq_chip, &rn5t618->irq_data); if (ret) dev_err(rn5t618->dev, "Failed to register IRQ chip\n"); return ret; } static void rn5t618_trigger_poweroff_sequence(bool repower) { int ret; /* disable automatic repower-on */ ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT); if (ret < 0) goto err; ret &= ~RN5T618_REPCNT_REPWRON; if (repower) ret |= RN5T618_REPCNT_REPWRON; ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT, (u8)ret); if (ret < 0) goto err; /* start power-off sequence */ ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT); if (ret < 0) goto err; ret |= RN5T618_SLPCNT_SWPWROFF; ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT, (u8)ret); if (ret < 0) goto err; return; err: dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret); } static void rn5t618_power_off(void) { rn5t618_trigger_poweroff_sequence(false); } static int rn5t618_restart(struct notifier_block *this, unsigned long mode, void *cmd) { rn5t618_trigger_poweroff_sequence(true); /* * Re-power factor detection on PMIC side is not instant. 1ms * proved to be enough time until reset takes effect. */ mdelay(1); return NOTIFY_DONE; } static const struct of_device_id rn5t618_of_match[] = { { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 }, { } }; MODULE_DEVICE_TABLE(of, rn5t618_of_match); static int rn5t618_i2c_probe(struct i2c_client *i2c) { const struct of_device_id *of_id; struct rn5t618 *priv; int ret; of_id = of_match_device(rn5t618_of_match, &i2c->dev); if (!of_id) { dev_err(&i2c->dev, "Failed to find matching DT ID\n"); return -EINVAL; } priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; i2c_set_clientdata(i2c, priv); priv->variant = (long)of_id->data; priv->irq = i2c->irq; priv->dev = &i2c->dev; priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config); if (IS_ERR(priv->regmap)) { ret = PTR_ERR(priv->regmap); dev_err(&i2c->dev, "regmap init failed: %d\n", ret); return ret; } if (priv->variant == RC5T619) ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, rc5t619_cells, ARRAY_SIZE(rc5t619_cells), NULL, 0, NULL); else ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, rn5t618_cells, ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL); if (ret) { dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret); return ret; } rn5t618_pm_power_off = i2c; if (of_device_is_system_power_controller(i2c->dev.of_node)) { if (!pm_power_off) pm_power_off = rn5t618_power_off; else dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); } rn5t618_restart_handler.notifier_call = rn5t618_restart; rn5t618_restart_handler.priority = 192; ret = register_restart_handler(&rn5t618_restart_handler); if (ret) { dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret); return ret; } return rn5t618_irq_init(priv); } static int rn5t618_i2c_remove(struct i2c_client *i2c) { if (i2c == rn5t618_pm_power_off) { rn5t618_pm_power_off = NULL; pm_power_off = NULL; } unregister_restart_handler(&rn5t618_restart_handler); return 0; } static int __maybe_unused rn5t618_i2c_suspend(struct device *dev) { struct rn5t618 *priv = dev_get_drvdata(dev); if (priv->irq) disable_irq(priv->irq); return 0; } static int __maybe_unused rn5t618_i2c_resume(struct device *dev) { struct rn5t618 *priv = dev_get_drvdata(dev); if (priv->irq) enable_irq(priv->irq); return 0; } static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops, rn5t618_i2c_suspend, rn5t618_i2c_resume); static struct i2c_driver rn5t618_i2c_driver = { .driver = { .name = "rn5t618", .of_match_table = of_match_ptr(rn5t618_of_match), .pm = &rn5t618_i2c_dev_pm_ops, }, .probe_new = rn5t618_i2c_probe, .remove = rn5t618_i2c_remove, }; module_i2c_driver(rn5t618_i2c_driver); MODULE_AUTHOR("Beniamino Galvani "); MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver"); MODULE_LICENSE("GPL v2");