1 // SPDX-License-Identifier: GPL-2.0-only
3 * MFD core driver for Ricoh RN5T618 PMIC
5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
6 * Copyright (C) 2016 Toradex AG
9 #include <linux/delay.h>
10 #include <linux/i2c.h>
11 #include <linux/mfd/core.h>
12 #include <linux/mfd/rn5t618.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/reboot.h>
16 #include <linux/regmap.h>
18 static const struct mfd_cell rn5t618_cells[] = {
19 { .name = "rn5t618-regulator" },
20 { .name = "rn5t618-wdt" },
23 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
26 case RN5T618_WATCHDOGCNT:
28 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
29 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
32 case RN5T618_MON_IOIN:
40 static const struct regmap_config rn5t618_regmap_config = {
43 .volatile_reg = rn5t618_volatile_reg,
44 .max_register = RN5T618_MAX_REG,
45 .cache_type = REGCACHE_RBTREE,
48 static struct rn5t618 *rn5t618_pm_power_off;
49 static struct notifier_block rn5t618_restart_handler;
51 static void rn5t618_trigger_poweroff_sequence(bool repower)
53 /* disable automatic repower-on */
54 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
55 RN5T618_REPCNT_REPWRON,
56 repower ? RN5T618_REPCNT_REPWRON : 0);
57 /* start power-off sequence */
58 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
59 RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
62 static void rn5t618_power_off(void)
64 rn5t618_trigger_poweroff_sequence(false);
67 static int rn5t618_restart(struct notifier_block *this,
68 unsigned long mode, void *cmd)
70 rn5t618_trigger_poweroff_sequence(true);
73 * Re-power factor detection on PMIC side is not instant. 1ms
74 * proved to be enough time until reset takes effect.
81 static const struct of_device_id rn5t618_of_match[] = {
82 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
83 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
84 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
87 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
89 static int rn5t618_i2c_probe(struct i2c_client *i2c,
90 const struct i2c_device_id *id)
92 const struct of_device_id *of_id;
96 of_id = of_match_device(rn5t618_of_match, &i2c->dev);
98 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
102 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
106 i2c_set_clientdata(i2c, priv);
107 priv->variant = (long)of_id->data;
109 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
110 if (IS_ERR(priv->regmap)) {
111 ret = PTR_ERR(priv->regmap);
112 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
116 ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
117 ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
119 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
123 rn5t618_pm_power_off = priv;
124 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
126 pm_power_off = rn5t618_power_off;
128 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
131 rn5t618_restart_handler.notifier_call = rn5t618_restart;
132 rn5t618_restart_handler.priority = 192;
134 ret = register_restart_handler(&rn5t618_restart_handler);
136 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
143 static int rn5t618_i2c_remove(struct i2c_client *i2c)
145 struct rn5t618 *priv = i2c_get_clientdata(i2c);
147 if (priv == rn5t618_pm_power_off) {
148 rn5t618_pm_power_off = NULL;
152 unregister_restart_handler(&rn5t618_restart_handler);
157 static const struct i2c_device_id rn5t618_i2c_id[] = {
160 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
162 static struct i2c_driver rn5t618_i2c_driver = {
165 .of_match_table = of_match_ptr(rn5t618_of_match),
167 .probe = rn5t618_i2c_probe,
168 .remove = rn5t618_i2c_remove,
169 .id_table = rn5t618_i2c_id,
172 module_i2c_driver(rn5t618_i2c_driver);
174 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
175 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
176 MODULE_LICENSE("GPL v2");