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/interrupt.h>
12 #include <linux/irq.h>
13 #include <linux/mfd/core.h>
14 #include <linux/mfd/rn5t618.h>
15 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/platform_device.h>
18 #include <linux/reboot.h>
19 #include <linux/regmap.h>
21 static const struct mfd_cell rn5t618_cells[] = {
22 { .name = "rn5t618-regulator" },
23 { .name = "rn5t618-wdt" },
26 static const struct mfd_cell rc5t619_cells[] = {
27 { .name = "rn5t618-adc" },
28 { .name = "rn5t618-power" },
29 { .name = "rn5t618-regulator" },
30 { .name = "rc5t619-rtc" },
31 { .name = "rn5t618-wdt" },
34 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
37 case RN5T618_WATCHDOGCNT:
39 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
41 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
44 case RN5T618_MON_IOIN:
46 case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
47 case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
49 case RN5T618_REGISET1 ... RN5T618_REGISET2:
50 case RN5T618_CHGSTATE:
51 case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
53 case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
60 static const struct regmap_config rn5t618_regmap_config = {
63 .volatile_reg = rn5t618_volatile_reg,
64 .max_register = RN5T618_MAX_REG,
65 .cache_type = REGCACHE_RBTREE,
68 static const struct regmap_irq rc5t619_irqs[] = {
69 REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
70 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
71 REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
72 REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
73 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
74 REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
77 static const struct regmap_irq_chip rc5t619_irq_chip = {
80 .num_irqs = ARRAY_SIZE(rc5t619_irqs),
82 .status_base = RN5T618_INTMON,
83 .mask_base = RN5T618_INTEN,
87 static struct i2c_client *rn5t618_pm_power_off;
88 static struct notifier_block rn5t618_restart_handler;
90 static int rn5t618_irq_init(struct rn5t618 *rn5t618)
92 const struct regmap_irq_chip *irq_chip = NULL;
98 switch (rn5t618->variant) {
100 irq_chip = &rc5t619_irq_chip;
103 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
104 (int)rn5t618->variant);
108 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
110 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
111 0, irq_chip, &rn5t618->irq_data);
113 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
118 static void rn5t618_trigger_poweroff_sequence(bool repower)
122 /* disable automatic repower-on */
123 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
127 ret &= ~RN5T618_REPCNT_REPWRON;
129 ret |= RN5T618_REPCNT_REPWRON;
131 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
132 RN5T618_REPCNT, (u8)ret);
136 /* start power-off sequence */
137 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
141 ret |= RN5T618_SLPCNT_SWPWROFF;
143 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
144 RN5T618_SLPCNT, (u8)ret);
151 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
154 static void rn5t618_power_off(void)
156 rn5t618_trigger_poweroff_sequence(false);
159 static int rn5t618_restart(struct notifier_block *this,
160 unsigned long mode, void *cmd)
162 rn5t618_trigger_poweroff_sequence(true);
165 * Re-power factor detection on PMIC side is not instant. 1ms
166 * proved to be enough time until reset takes effect.
173 static const struct of_device_id rn5t618_of_match[] = {
174 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
175 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
176 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
179 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
181 static int rn5t618_i2c_probe(struct i2c_client *i2c)
183 const struct of_device_id *of_id;
184 struct rn5t618 *priv;
187 of_id = of_match_device(rn5t618_of_match, &i2c->dev);
189 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
193 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
197 i2c_set_clientdata(i2c, priv);
198 priv->variant = (long)of_id->data;
199 priv->irq = i2c->irq;
200 priv->dev = &i2c->dev;
202 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
203 if (IS_ERR(priv->regmap)) {
204 ret = PTR_ERR(priv->regmap);
205 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
209 if (priv->variant == RC5T619)
210 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
212 ARRAY_SIZE(rc5t619_cells),
215 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
217 ARRAY_SIZE(rn5t618_cells),
220 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
224 rn5t618_pm_power_off = i2c;
225 if (of_device_is_system_power_controller(i2c->dev.of_node)) {
227 pm_power_off = rn5t618_power_off;
229 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
232 rn5t618_restart_handler.notifier_call = rn5t618_restart;
233 rn5t618_restart_handler.priority = 192;
235 ret = register_restart_handler(&rn5t618_restart_handler);
237 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
241 return rn5t618_irq_init(priv);
244 static void rn5t618_i2c_remove(struct i2c_client *i2c)
246 if (i2c == rn5t618_pm_power_off) {
247 rn5t618_pm_power_off = NULL;
251 unregister_restart_handler(&rn5t618_restart_handler);
254 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
256 struct rn5t618 *priv = dev_get_drvdata(dev);
259 disable_irq(priv->irq);
264 static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
266 struct rn5t618 *priv = dev_get_drvdata(dev);
269 enable_irq(priv->irq);
274 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
278 static struct i2c_driver rn5t618_i2c_driver = {
281 .of_match_table = of_match_ptr(rn5t618_of_match),
282 .pm = &rn5t618_i2c_dev_pm_ops,
284 .probe_new = rn5t618_i2c_probe,
285 .remove = rn5t618_i2c_remove,
288 module_i2c_driver(rn5t618_i2c_driver);
290 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
291 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
292 MODULE_LICENSE("GPL v2");