drivers/mfd/rn5t618.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * MFD core driver for Ricoh RN5T618 PMIC
   4  *
   5  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
   6  * Copyright (C) 2016 Toradex AG
   7  */
   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_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/reboot.h>
  19 #include <linux/regmap.h>
  20
  21 static const struct mfd_cell rn5t618_cells[] = {
  22         { .name = "rn5t618-regulator" },
  23         { .name = "rn5t618-wdt" },
  24 };
  25
  26 static const struct mfd_cell rc5t619_cells[] = {
  27         { .name = "rn5t618-adc" },
  28         { .name = "rn5t618-regulator" },
  29         { .name = "rc5t619-rtc" },
  30         { .name = "rn5t618-wdt" },
  31 };
  32
  33 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
  34 {
  35         switch (reg) {
  36         case RN5T618_WATCHDOGCNT:
  37         case RN5T618_DCIRQ:
  38         case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
  39         case RN5T618_ADCCNT3:
  40         case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
  41         case RN5T618_IR_GPR:
  42         case RN5T618_IR_GPF:
  43         case RN5T618_MON_IOIN:
  44         case RN5T618_INTMON:
  45         case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
  46         case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
  47         case RN5T618_CHGSTATE:
  48         case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
  49         case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
  50                 return true;
  51         default:
  52                 return false;
  53         }
  54 }
  55
  56 static const struct regmap_config rn5t618_regmap_config = {
  57         .reg_bits       = 8,
  58         .val_bits       = 8,
  59         .volatile_reg   = rn5t618_volatile_reg,
  60         .max_register   = RN5T618_MAX_REG,
  61         .cache_type     = REGCACHE_RBTREE,
  62 };
  63
  64 static const struct regmap_irq rc5t619_irqs[] = {
  65         REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
  66         REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
  67         REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
  68         REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
  69         REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
  70         REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
  71 };
  72
  73 static const struct regmap_irq_chip rc5t619_irq_chip = {
  74         .name = "rc5t619",
  75         .irqs = rc5t619_irqs,
  76         .num_irqs = ARRAY_SIZE(rc5t619_irqs),
  77         .num_regs = 1,
  78         .status_base = RN5T618_INTMON,
  79         .mask_base = RN5T618_INTEN,
  80         .mask_invert = true,
  81 };
  82
  83 static struct i2c_client *rn5t618_pm_power_off;
  84 static struct notifier_block rn5t618_restart_handler;
  85
  86 static int rn5t618_irq_init(struct rn5t618 *rn5t618)
  87 {
  88         const struct regmap_irq_chip *irq_chip = NULL;
  89         int ret;
  90
  91         if (!rn5t618->irq)
  92                 return 0;
  93
  94         switch (rn5t618->variant) {
  95         case RC5T619:
  96                 irq_chip = &rc5t619_irq_chip;
  97                 break;
  98         default:
  99                 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
 100                         (int)rn5t618->variant);
 101                 return -ENOENT;
 102         }
 103
 104         ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
 105                                        rn5t618->irq,
 106                                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 107                                        0, irq_chip, &rn5t618->irq_data);
 108         if (ret)
 109                 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
 110
 111         return ret;
 112 }
 113
 114 static void rn5t618_trigger_poweroff_sequence(bool repower)
 115 {
 116         int ret;
 117
 118         /* disable automatic repower-on */
 119         ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
 120         if (ret < 0)
 121                 goto err;
 122
 123         ret &= ~RN5T618_REPCNT_REPWRON;
 124         if (repower)
 125                 ret |= RN5T618_REPCNT_REPWRON;
 126
 127         ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
 128                                         RN5T618_REPCNT, (u8)ret);
 129         if (ret < 0)
 130                 goto err;
 131
 132         /* start power-off sequence */
 133         ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
 134         if (ret < 0)
 135                 goto err;
 136
 137         ret |= RN5T618_SLPCNT_SWPWROFF;
 138
 139         ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
 140                                         RN5T618_SLPCNT, (u8)ret);
 141         if (ret < 0)
 142                 goto err;
 143
 144         return;
 145
 146 err:
 147         dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
 148 }
 149
 150 static void rn5t618_power_off(void)
 151 {
 152         rn5t618_trigger_poweroff_sequence(false);
 153 }
 154
 155 static int rn5t618_restart(struct notifier_block *this,
 156                             unsigned long mode, void *cmd)
 157 {
 158         rn5t618_trigger_poweroff_sequence(true);
 159
 160         /*
 161          * Re-power factor detection on PMIC side is not instant. 1ms
 162          * proved to be enough time until reset takes effect.
 163          */
 164         mdelay(1);
 165
 166         return NOTIFY_DONE;
 167 }
 168
 169 static const struct of_device_id rn5t618_of_match[] = {
 170         { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
 171         { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
 172         { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
 173         { }
 174 };
 175 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
 176
 177 static int rn5t618_i2c_probe(struct i2c_client *i2c)
 178 {
 179         const struct of_device_id *of_id;
 180         struct rn5t618 *priv;
 181         int ret;
 182
 183         of_id = of_match_device(rn5t618_of_match, &i2c->dev);
 184         if (!of_id) {
 185                 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
 186                 return -EINVAL;
 187         }
 188
 189         priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 190         if (!priv)
 191                 return -ENOMEM;
 192
 193         i2c_set_clientdata(i2c, priv);
 194         priv->variant = (long)of_id->data;
 195         priv->irq = i2c->irq;
 196         priv->dev = &i2c->dev;
 197
 198         priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
 199         if (IS_ERR(priv->regmap)) {
 200                 ret = PTR_ERR(priv->regmap);
 201                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 202                 return ret;
 203         }
 204
 205         if (priv->variant == RC5T619)
 206                 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
 207                                            rc5t619_cells,
 208                                            ARRAY_SIZE(rc5t619_cells),
 209                                            NULL, 0, NULL);
 210         else
 211                 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
 212                                            rn5t618_cells,
 213                                            ARRAY_SIZE(rn5t618_cells),
 214                                            NULL, 0, NULL);
 215         if (ret) {
 216                 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
 217                 return ret;
 218         }
 219
 220         rn5t618_pm_power_off = i2c;
 221         if (of_device_is_system_power_controller(i2c->dev.of_node)) {
 222                 if (!pm_power_off)
 223                         pm_power_off = rn5t618_power_off;
 224                 else
 225                         dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
 226         }
 227
 228         rn5t618_restart_handler.notifier_call = rn5t618_restart;
 229         rn5t618_restart_handler.priority = 192;
 230
 231         ret = register_restart_handler(&rn5t618_restart_handler);
 232         if (ret) {
 233                 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
 234                 return ret;
 235         }
 236
 237         return rn5t618_irq_init(priv);
 238 }
 239
 240 static int rn5t618_i2c_remove(struct i2c_client *i2c)
 241 {
 242         if (i2c == rn5t618_pm_power_off) {
 243                 rn5t618_pm_power_off = NULL;
 244                 pm_power_off = NULL;
 245         }
 246
 247         unregister_restart_handler(&rn5t618_restart_handler);
 248
 249         return 0;
 250 }
 251
 252 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
 253 {
 254         struct rn5t618 *priv = dev_get_drvdata(dev);
 255
 256         if (priv->irq)
 257                 disable_irq(priv->irq);
 258
 259         return 0;
 260 }
 261
 262 static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
 263 {
 264         struct rn5t618 *priv = dev_get_drvdata(dev);
 265
 266         if (priv->irq)
 267                 enable_irq(priv->irq);
 268
 269         return 0;
 270 }
 271
 272 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
 273                         rn5t618_i2c_suspend,
 274                         rn5t618_i2c_resume);
 275
 276 static struct i2c_driver rn5t618_i2c_driver = {
 277         .driver = {
 278                 .name = "rn5t618",
 279                 .of_match_table = of_match_ptr(rn5t618_of_match),
 280                 .pm = &rn5t618_i2c_dev_pm_ops,
 281         },
 282         .probe_new = rn5t618_i2c_probe,
 283         .remove = rn5t618_i2c_remove,
 284 };
 285
 286 module_i2c_driver(rn5t618_i2c_driver);
 287
 288 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
 289 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
 290 MODULE_LICENSE("GPL v2");