/* * MFD core driver for Ricoh RN5T618 PMIC * * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> * Copyright (C) 2016 Toradex AG * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/mfd/core.h> #include <linux/mfd/rn5t618.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/reboot.h> #include <linux/regmap.h> static const struct mfd_cell rn5t618_cells[] = { { .name = "rn5t618-regulator" }, { .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_IR_ADC1 ... RN5T618_IR_ADC3: case RN5T618_IR_GPR: case RN5T618_IR_GPF: case RN5T618_MON_IOIN: case RN5T618_INTMON: 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 struct rn5t618 *rn5t618_pm_power_off; static struct notifier_block rn5t618_restart_handler; static void rn5t618_trigger_poweroff_sequence(bool repower) { /* disable automatic repower-on */ regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT, RN5T618_REPCNT_REPWRON, repower ? RN5T618_REPCNT_REPWRON : 0); /* start power-off sequence */ regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT, RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF); } 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 i2c_device_id *id) { 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->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; } ret = devm_mfd_add_devices(&i2c->dev, -1, 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 = priv; 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 0; } static int rn5t618_i2c_remove(struct i2c_client *i2c) { struct rn5t618 *priv = i2c_get_clientdata(i2c); if (priv == rn5t618_pm_power_off) { rn5t618_pm_power_off = NULL; pm_power_off = NULL; } unregister_restart_handler(&rn5t618_restart_handler); return 0; } static const struct i2c_device_id rn5t618_i2c_id[] = { { } }; MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id); static struct i2c_driver rn5t618_i2c_driver = { .driver = { .name = "rn5t618", .of_match_table = of_match_ptr(rn5t618_of_match), }, .probe = rn5t618_i2c_probe, .remove = rn5t618_i2c_remove, .id_table = rn5t618_i2c_id, }; 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");