drivers/mfd/rt5033.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * MFD core driver for the Richtek RT5033.
   4  *
   5  * RT5033 comprises multiple sub-devices switcing charger, fuel gauge,
   6  * flash LED, current source, LDO and BUCK regulators.
   7  *
   8  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
   9  * Author: Beomho Seo <beomho.seo@samsung.com>
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/of_device.h>
  16 #include <linux/mfd/core.h>
  17 #include <linux/mfd/rt5033.h>
  18 #include <linux/mfd/rt5033-private.h>
  19
  20 static const struct regmap_irq rt5033_irqs[] = {
  21         { .mask = RT5033_PMIC_IRQ_BUCKOCP, },
  22         { .mask = RT5033_PMIC_IRQ_BUCKLV, },
  23         { .mask = RT5033_PMIC_IRQ_SAFELDOLV, },
  24         { .mask = RT5033_PMIC_IRQ_LDOLV, },
  25         { .mask = RT5033_PMIC_IRQ_OT, },
  26         { .mask = RT5033_PMIC_IRQ_VDDA_UV, },
  27 };
  28
  29 static const struct regmap_irq_chip rt5033_irq_chip = {
  30         .name           = "rt5033",
  31         .status_base    = RT5033_REG_PMIC_IRQ_STAT,
  32         .mask_base      = RT5033_REG_PMIC_IRQ_CTRL,
  33         .mask_invert    = true,
  34         .num_regs       = 1,
  35         .irqs           = rt5033_irqs,
  36         .num_irqs       = ARRAY_SIZE(rt5033_irqs),
  37 };
  38
  39 static const struct mfd_cell rt5033_devs[] = {
  40         { .name = "rt5033-regulator", },
  41         {
  42                 .name = "rt5033-charger",
  43                 .of_compatible = "richtek,rt5033-charger",
  44         }, {
  45                 .name = "rt5033-led",
  46                 .of_compatible = "richtek,rt5033-led",
  47         },
  48 };
  49
  50 static const struct regmap_config rt5033_regmap_config = {
  51         .reg_bits       = 8,
  52         .val_bits       = 8,
  53         .max_register   = RT5033_REG_END,
  54 };
  55
  56 static int rt5033_i2c_probe(struct i2c_client *i2c,
  57                                 const struct i2c_device_id *id)
  58 {
  59         struct rt5033_dev *rt5033;
  60         unsigned int dev_id;
  61         int ret;
  62
  63         rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
  64         if (!rt5033)
  65                 return -ENOMEM;
  66
  67         i2c_set_clientdata(i2c, rt5033);
  68         rt5033->dev = &i2c->dev;
  69         rt5033->irq = i2c->irq;
  70         rt5033->wakeup = true;
  71
  72         rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
  73         if (IS_ERR(rt5033->regmap)) {
  74                 dev_err(&i2c->dev, "Failed to allocate register map.\n");
  75                 return PTR_ERR(rt5033->regmap);
  76         }
  77
  78         ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
  79         if (ret) {
  80                 dev_err(&i2c->dev, "Device not found\n");
  81                 return -ENODEV;
  82         }
  83         dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
  84
  85         ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
  86                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  87                         0, &rt5033_irq_chip, &rt5033->irq_data);
  88         if (ret) {
  89                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
  90                                                         rt5033->irq, ret);
  91                 return ret;
  92         }
  93
  94         ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs,
  95                                    ARRAY_SIZE(rt5033_devs), NULL, 0,
  96                                    regmap_irq_get_domain(rt5033->irq_data));
  97         if (ret < 0) {
  98                 dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
  99                 return ret;
 100         }
 101
 102         device_init_wakeup(rt5033->dev, rt5033->wakeup);
 103
 104         return 0;
 105 }
 106
 107 static const struct i2c_device_id rt5033_i2c_id[] = {
 108         { "rt5033", },
 109         { }
 110 };
 111 MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
 112
 113 static const struct of_device_id rt5033_dt_match[] = {
 114         { .compatible = "richtek,rt5033", },
 115         { }
 116 };
 117 MODULE_DEVICE_TABLE(of, rt5033_dt_match);
 118
 119 static struct i2c_driver rt5033_driver = {
 120         .driver = {
 121                 .name = "rt5033",
 122                 .of_match_table = of_match_ptr(rt5033_dt_match),
 123         },
 124         .probe = rt5033_i2c_probe,
 125         .id_table = rt5033_i2c_id,
 126 };
 127 module_i2c_driver(rt5033_driver);
 128
 129 MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
 130 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 131 MODULE_LICENSE("GPL");