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