| /* |
| * 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"); |