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