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                 return true;
  48         default:
  49                 return false;
  50         }
  51 }
  52
  53 static const struct regmap_config rn5t618_regmap_config = {
  54         .reg_bits       = 8,
  55         .val_bits       = 8,
  56         .volatile_reg   = rn5t618_volatile_reg,
  57         .max_register   = RN5T618_MAX_REG,
  58         .cache_type     = REGCACHE_RBTREE,
  59 };
  60
  61 static const struct regmap_irq rc5t619_irqs[] = {
  62         REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
  63         REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
  64         REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
  65         REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
  66         REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
  67         REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
  68 };
  69
  70 static const struct regmap_irq_chip rc5t619_irq_chip = {
  71         .name = "rc5t619",
  72         .irqs = rc5t619_irqs,
  73         .num_irqs = ARRAY_SIZE(rc5t619_irqs),
  74         .num_regs = 1,
  75         .status_base = RN5T618_INTMON,
  76         .mask_base = RN5T618_INTEN,
  77         .mask_invert = true,
  78 };
  79
  80 static struct rn5t618 *rn5t618_pm_power_off;
  81 static struct notifier_block rn5t618_restart_handler;
  82
  83 static int rn5t618_irq_init(struct rn5t618 *rn5t618)
  84 {
  85         const struct regmap_irq_chip *irq_chip = NULL;
  86         int ret;
  87
  88         if (!rn5t618->irq)
  89                 return 0;
  90
  91         switch (rn5t618->variant) {
  92         case RC5T619:
  93                 irq_chip = &rc5t619_irq_chip;
  94                 break;
  95         default:
  96                 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
  97                         (int)rn5t618->variant);
  98                 return -ENOENT;
  99         }
 100
 101         ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
 102                                        rn5t618->irq,
 103                                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 104                                        0, irq_chip, &rn5t618->irq_data);
 105         if (ret)
 106                 dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
 107
 108         return ret;
 109 }
 110
 111 static void rn5t618_trigger_poweroff_sequence(bool repower)
 112 {
 113         /* disable automatic repower-on */
 114         regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
 115                            RN5T618_REPCNT_REPWRON,
 116                            repower ? RN5T618_REPCNT_REPWRON : 0);
 117         /* start power-off sequence */
 118         regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
 119                            RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
 120 }
 121
 122 static void rn5t618_power_off(void)
 123 {
 124         rn5t618_trigger_poweroff_sequence(false);
 125 }
 126
 127 static int rn5t618_restart(struct notifier_block *this,
 128                             unsigned long mode, void *cmd)
 129 {
 130         rn5t618_trigger_poweroff_sequence(true);
 131
 132         /*
 133          * Re-power factor detection on PMIC side is not instant. 1ms
 134          * proved to be enough time until reset takes effect.
 135          */
 136         mdelay(1);
 137
 138         return NOTIFY_DONE;
 139 }
 140
 141 static const struct of_device_id rn5t618_of_match[] = {
 142         { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
 143         { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
 144         { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
 145         { }
 146 };
 147 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
 148
 149 static int rn5t618_i2c_probe(struct i2c_client *i2c)
 150 {
 151         const struct of_device_id *of_id;
 152         struct rn5t618 *priv;
 153         int ret;
 154
 155         of_id = of_match_device(rn5t618_of_match, &i2c->dev);
 156         if (!of_id) {
 157                 dev_err(&i2c->dev, "Failed to find matching DT ID\n");
 158                 return -EINVAL;
 159         }
 160
 161         priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
 162         if (!priv)
 163                 return -ENOMEM;
 164
 165         i2c_set_clientdata(i2c, priv);
 166         priv->variant = (long)of_id->data;
 167         priv->irq = i2c->irq;
 168         priv->dev = &i2c->dev;
 169
 170         priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
 171         if (IS_ERR(priv->regmap)) {
 172                 ret = PTR_ERR(priv->regmap);
 173                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 174                 return ret;
 175         }
 176
 177         if (priv->variant == RC5T619)
 178                 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
 179                                            rc5t619_cells,
 180                                            ARRAY_SIZE(rc5t619_cells),
 181                                            NULL, 0, NULL);
 182         else
 183                 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
 184                                            rn5t618_cells,
 185                                            ARRAY_SIZE(rn5t618_cells),
 186                                            NULL, 0, NULL);
 187         if (ret) {
 188                 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
 189                 return ret;
 190         }
 191
 192         rn5t618_pm_power_off = priv;
 193         if (of_device_is_system_power_controller(i2c->dev.of_node)) {
 194                 if (!pm_power_off)
 195                         pm_power_off = rn5t618_power_off;
 196                 else
 197                         dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
 198         }
 199
 200         rn5t618_restart_handler.notifier_call = rn5t618_restart;
 201         rn5t618_restart_handler.priority = 192;
 202
 203         ret = register_restart_handler(&rn5t618_restart_handler);
 204         if (ret) {
 205                 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
 206                 return ret;
 207         }
 208
 209         return rn5t618_irq_init(priv);
 210 }
 211
 212 static int rn5t618_i2c_remove(struct i2c_client *i2c)
 213 {
 214         struct rn5t618 *priv = i2c_get_clientdata(i2c);
 215
 216         if (priv == rn5t618_pm_power_off) {
 217                 rn5t618_pm_power_off = NULL;
 218                 pm_power_off = NULL;
 219         }
 220
 221         unregister_restart_handler(&rn5t618_restart_handler);
 222
 223         return 0;
 224 }
 225
 226 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
 227 {
 228         struct rn5t618 *priv = dev_get_drvdata(dev);
 229
 230         if (priv->irq)
 231                 disable_irq(priv->irq);
 232
 233         return 0;
 234 }
 235
 236 static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
 237 {
 238         struct rn5t618 *priv = dev_get_drvdata(dev);
 239
 240         if (priv->irq)
 241                 enable_irq(priv->irq);
 242
 243         return 0;
 244 }
 245
 246 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
 247                         rn5t618_i2c_suspend,
 248                         rn5t618_i2c_resume);
 249
 250 static struct i2c_driver rn5t618_i2c_driver = {
 251         .driver = {
 252                 .name = "rn5t618",
 253                 .of_match_table = of_match_ptr(rn5t618_of_match),
 254                 .pm = &rn5t618_i2c_dev_pm_ops,
 255         },
 256         .probe_new = rn5t618_i2c_probe,
 257         .remove = rn5t618_i2c_remove,
 258 };
 259
 260 module_i2c_driver(rn5t618_i2c_driver);
 261
 262 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
 263 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
 264 MODULE_LICENSE("GPL v2");