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/mod_devicetable.h>
  14 #include <linux/module.h>
  15 #include <linux/interrupt.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         .unmask_base    = RT5033_REG_PMIC_IRQ_CTRL,
  33         .num_regs       = 1,
  34         .irqs           = rt5033_irqs,
  35         .num_irqs       = ARRAY_SIZE(rt5033_irqs),
  36 };
  37
  38 static const struct mfd_cell rt5033_devs[] = {
  39         { .name = "rt5033-regulator", },
  40         {
  41                 .name = "rt5033-charger",
  42                 .of_compatible = "richtek,rt5033-charger",
  43         }, {
  44                 .name = "rt5033-led",
  45                 .of_compatible = "richtek,rt5033-led",
  46         },
  47 };
  48
  49 static const struct regmap_config rt5033_regmap_config = {
  50         .reg_bits       = 8,
  51         .val_bits       = 8,
  52         .max_register   = RT5033_REG_END,
  53 };
  54
  55 static int rt5033_i2c_probe(struct i2c_client *i2c)
  56 {
  57         struct rt5033_dev *rt5033;
  58         unsigned int dev_id, chip_rev;
  59         int ret;
  60
  61         rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
  62         if (!rt5033)
  63                 return -ENOMEM;
  64
  65         i2c_set_clientdata(i2c, rt5033);
  66         rt5033->dev = &i2c->dev;
  67         rt5033->irq = i2c->irq;
  68         rt5033->wakeup = true;
  69
  70         rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
  71         if (IS_ERR(rt5033->regmap)) {
  72                 dev_err(&i2c->dev, "Failed to allocate register map.\n");
  73                 return PTR_ERR(rt5033->regmap);
  74         }
  75
  76         ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
  77         if (ret) {
  78                 dev_err(&i2c->dev, "Device not found\n");
  79                 return -ENODEV;
  80         }
  81         chip_rev = dev_id & RT5033_CHIP_REV_MASK;
  82         dev_info(&i2c->dev, "Device found (rev. %d)\n", chip_rev);
  83
  84         ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
  85                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  86                         0, &rt5033_irq_chip, &rt5033->irq_data);
  87         if (ret) {
  88                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
  89                                                         rt5033->irq, ret);
  90                 return ret;
  91         }
  92
  93         ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs,
  94                                    ARRAY_SIZE(rt5033_devs), NULL, 0,
  95                                    regmap_irq_get_domain(rt5033->irq_data));
  96         if (ret < 0) {
  97                 dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
  98                 return ret;
  99         }
 100
 101         device_init_wakeup(rt5033->dev, rt5033->wakeup);
 102
 103         return 0;
 104 }
 105
 106 static const struct i2c_device_id rt5033_i2c_id[] = {
 107         { "rt5033", },
 108         { }
 109 };
 110 MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
 111
 112 static const struct of_device_id rt5033_dt_match[] = {
 113         { .compatible = "richtek,rt5033", },
 114         { }
 115 };
 116 MODULE_DEVICE_TABLE(of, rt5033_dt_match);
 117
 118 static struct i2c_driver rt5033_driver = {
 119         .driver = {
 120                 .name = "rt5033",
 121                 .of_match_table = rt5033_dt_match,
 122         },
 123         .probe = rt5033_i2c_probe,
 124         .id_table = rt5033_i2c_id,
 125 };
 126 module_i2c_driver(rt5033_driver);
 127
 128 MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
 129 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 130 MODULE_LICENSE("GPL");