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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * MFD core driver for Ricoh RN5T618 PMIC4 *5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>6 * Copyright (C) 2016 Toradex AG7 */8 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.h>17#include <linux/platform_device.h>18#include <linux/reboot.h>19#include <linux/regmap.h>20 21static const struct mfd_cell rn5t618_cells[] = {22 { .name = "rn5t618-regulator" },23 { .name = "rn5t618-wdt" },24};25 26static 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" },32};33 34static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)35{36 switch (reg) {37 case RN5T618_WATCHDOGCNT:38 case RN5T618_DCIRQ:39 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:40 case RN5T618_ADCCNT3:41 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:42 case RN5T618_IR_GPR:43 case RN5T618_IR_GPF:44 case RN5T618_MON_IOIN:45 case RN5T618_INTMON:46 case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:47 case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:48 case RN5T618_CHGCTL1:49 case RN5T618_REGISET1 ... RN5T618_REGISET2:50 case RN5T618_CHGSTATE:51 case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:52 case RN5T618_GCHGDET:53 case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:54 return true;55 default:56 return false;57 }58}59 60static const struct regmap_config rn5t618_regmap_config = {61 .reg_bits = 8,62 .val_bits = 8,63 .volatile_reg = rn5t618_volatile_reg,64 .max_register = RN5T618_MAX_REG,65 .cache_type = REGCACHE_MAPLE,66};67 68static 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)),75};76 77static const struct regmap_irq_chip rc5t619_irq_chip = {78 .name = "rc5t619",79 .irqs = rc5t619_irqs,80 .num_irqs = ARRAY_SIZE(rc5t619_irqs),81 .num_regs = 1,82 .status_base = RN5T618_INTMON,83 .unmask_base = RN5T618_INTEN,84};85 86static struct i2c_client *rn5t618_pm_power_off;87static struct notifier_block rn5t618_restart_handler;88 89static int rn5t618_irq_init(struct rn5t618 *rn5t618)90{91 const struct regmap_irq_chip *irq_chip = NULL;92 int ret;93 94 if (!rn5t618->irq)95 return 0;96 97 switch (rn5t618->variant) {98 case RC5T619:99 irq_chip = &rc5t619_irq_chip;100 break;101 default:102 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",103 (int)rn5t618->variant);104 return -ENOENT;105 }106 107 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,108 rn5t618->irq,109 IRQF_TRIGGER_LOW | IRQF_ONESHOT,110 0, irq_chip, &rn5t618->irq_data);111 if (ret)112 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");113 114 return ret;115}116 117static void rn5t618_trigger_poweroff_sequence(bool repower)118{119 int ret;120 121 /* disable automatic repower-on */122 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);123 if (ret < 0)124 goto err;125 126 ret &= ~RN5T618_REPCNT_REPWRON;127 if (repower)128 ret |= RN5T618_REPCNT_REPWRON;129 130 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,131 RN5T618_REPCNT, (u8)ret);132 if (ret < 0)133 goto err;134 135 /* start power-off sequence */136 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);137 if (ret < 0)138 goto err;139 140 ret |= RN5T618_SLPCNT_SWPWROFF;141 142 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,143 RN5T618_SLPCNT, (u8)ret);144 if (ret < 0)145 goto err;146 147 return;148 149err:150 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);151}152 153static void rn5t618_power_off(void)154{155 rn5t618_trigger_poweroff_sequence(false);156}157 158static int rn5t618_restart(struct notifier_block *this,159 unsigned long mode, void *cmd)160{161 rn5t618_trigger_poweroff_sequence(true);162 163 /*164 * Re-power factor detection on PMIC side is not instant. 1ms165 * proved to be enough time until reset takes effect.166 */167 mdelay(1);168 169 return NOTIFY_DONE;170}171 172static const struct of_device_id rn5t618_of_match[] = {173 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },174 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },175 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },176 { }177};178MODULE_DEVICE_TABLE(of, rn5t618_of_match);179 180static int rn5t618_i2c_probe(struct i2c_client *i2c)181{182 struct rn5t618 *priv;183 int ret;184 185 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);186 if (!priv)187 return -ENOMEM;188 189 i2c_set_clientdata(i2c, priv);190 priv->variant = (long)i2c_get_match_data(i2c);191 priv->irq = i2c->irq;192 priv->dev = &i2c->dev;193 194 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);195 if (IS_ERR(priv->regmap)) {196 ret = PTR_ERR(priv->regmap);197 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);198 return ret;199 }200 201 if (priv->variant == RC5T619)202 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,203 rc5t619_cells,204 ARRAY_SIZE(rc5t619_cells),205 NULL, 0, NULL);206 else207 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,208 rn5t618_cells,209 ARRAY_SIZE(rn5t618_cells),210 NULL, 0, NULL);211 if (ret) {212 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);213 return ret;214 }215 216 rn5t618_pm_power_off = i2c;217 if (of_device_is_system_power_controller(i2c->dev.of_node)) {218 if (!pm_power_off)219 pm_power_off = rn5t618_power_off;220 else221 dev_warn(&i2c->dev, "Poweroff callback already assigned\n");222 }223 224 rn5t618_restart_handler.notifier_call = rn5t618_restart;225 rn5t618_restart_handler.priority = 192;226 227 ret = register_restart_handler(&rn5t618_restart_handler);228 if (ret) {229 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);230 return ret;231 }232 233 return rn5t618_irq_init(priv);234}235 236static void rn5t618_i2c_remove(struct i2c_client *i2c)237{238 if (i2c == rn5t618_pm_power_off) {239 rn5t618_pm_power_off = NULL;240 pm_power_off = NULL;241 }242 243 unregister_restart_handler(&rn5t618_restart_handler);244}245 246static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)247{248 struct rn5t618 *priv = dev_get_drvdata(dev);249 250 if (priv->irq)251 disable_irq(priv->irq);252 253 return 0;254}255 256static int __maybe_unused rn5t618_i2c_resume(struct device *dev)257{258 struct rn5t618 *priv = dev_get_drvdata(dev);259 260 if (priv->irq)261 enable_irq(priv->irq);262 263 return 0;264}265 266static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,267 rn5t618_i2c_suspend,268 rn5t618_i2c_resume);269 270static struct i2c_driver rn5t618_i2c_driver = {271 .driver = {272 .name = "rn5t618",273 .of_match_table = rn5t618_of_match,274 .pm = &rn5t618_i2c_dev_pm_ops,275 },276 .probe = rn5t618_i2c_probe,277 .remove = rn5t618_i2c_remove,278};279 280module_i2c_driver(rn5t618_i2c_driver);281 282MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");283MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");284MODULE_LICENSE("GPL v2");285