diff options
Diffstat (limited to 'drivers/mfd/rn5t618.c')
| -rw-r--r-- | drivers/mfd/rn5t618.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c new file mode 100644 index 0000000000..0fe616b2db --- /dev/null +++ b/drivers/mfd/rn5t618.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core driver for Ricoh RN5T618 PMIC + * + * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> + * Copyright (C) 2016 Toradex AG + */ + +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/mfd/core.h> +#include <linux/mfd/rn5t618.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> +#include <linux/regmap.h> + +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, + .unmask_base = RN5T618_INTEN, +}; + +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_LOW | 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 void 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); +} + +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 = rn5t618_of_match, + .pm = &rn5t618_i2c_dev_pm_ops, + }, + .probe = rn5t618_i2c_probe, + .remove = rn5t618_i2c_remove, +}; + +module_i2c_driver(rn5t618_i2c_driver); + +MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); +MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver"); +MODULE_LICENSE("GPL v2"); |