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.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_MAPLE,
  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         .unmask_base = RN5T618_INTEN,
  84 };
  85
  86 static struct i2c_client *rn5t618_pm_power_off;
  87 static struct notifier_block rn5t618_restart_handler;
  88
  89 static 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
 117 static 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
 149 err:
 150         dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
 151 }
 152
 153 static void rn5t618_power_off(void)
 154 {
 155         rn5t618_trigger_poweroff_sequence(false);
 156 }
 157
 158 static 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. 1ms
 165          * proved to be enough time until reset takes effect.
 166          */
 167         mdelay(1);
 168
 169         return NOTIFY_DONE;
 170 }
 171
 172 static 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 };
 178 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
 179
 180 static 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         else
 207                 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                 else
 221                         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
 236 static 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
 246 static 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
 256 static 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
 266 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
 267                         rn5t618_i2c_suspend,
 268                         rn5t618_i2c_resume);
 269
 270 static 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
 280 module_i2c_driver(rn5t618_i2c_driver);
 281
 282 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
 283 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
 284 MODULE_LICENSE("GPL v2");