drivers/mfd/rt5033.c

   1 /*
   2  * MFD core driver for the Richtek RT5033.
   3  *
   4  * RT5033 comprises multiple sub-devices switcing charger, fuel gauge,
   5  * flash LED, current source, LDO and BUCK regulators.
   6  *
   7  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
   8  * Author: Beomho Seo <beomho.seo@samsung.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published bythe Free Software Foundation.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/of_device.h>
  19 #include <linux/mfd/core.h>
  20 #include <linux/mfd/rt5033.h>
  21 #include <linux/mfd/rt5033-private.h>
  22
  23 static const struct regmap_irq rt5033_irqs[] = {
  24         { .mask = RT5033_PMIC_IRQ_BUCKOCP, },
  25         { .mask = RT5033_PMIC_IRQ_BUCKLV, },
  26         { .mask = RT5033_PMIC_IRQ_SAFELDOLV, },
  27         { .mask = RT5033_PMIC_IRQ_LDOLV, },
  28         { .mask = RT5033_PMIC_IRQ_OT, },
  29         { .mask = RT5033_PMIC_IRQ_VDDA_UV, },
  30 };
  31
  32 static const struct regmap_irq_chip rt5033_irq_chip = {
  33         .name           = "rt5033",
  34         .status_base    = RT5033_REG_PMIC_IRQ_STAT,
  35         .mask_base      = RT5033_REG_PMIC_IRQ_CTRL,
  36         .mask_invert    = true,
  37         .num_regs       = 1,
  38         .irqs           = rt5033_irqs,
  39         .num_irqs       = ARRAY_SIZE(rt5033_irqs),
  40 };
  41
  42 static const struct mfd_cell rt5033_devs[] = {
  43         { .name = "rt5033-regulator", },
  44         {
  45                 .name = "rt5033-charger",
  46                 .of_compatible = "richtek,rt5033-charger",
  47         }, {
  48                 .name = "rt5033-battery",
  49                 .of_compatible = "richtek,rt5033-battery",
  50         },
  51 };
  52
  53 static const struct regmap_config rt5033_regmap_config = {
  54         .reg_bits       = 8,
  55         .val_bits       = 8,
  56         .max_register   = RT5033_REG_END,
  57 };
  58
  59 static int rt5033_i2c_probe(struct i2c_client *i2c,
  60                                 const struct i2c_device_id *id)
  61 {
  62         struct rt5033_dev *rt5033;
  63         unsigned int dev_id;
  64         int ret;
  65
  66         rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
  67         if (!rt5033)
  68                 return -ENOMEM;
  69
  70         i2c_set_clientdata(i2c, rt5033);
  71         rt5033->dev = &i2c->dev;
  72         rt5033->irq = i2c->irq;
  73         rt5033->wakeup = true;
  74
  75         rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
  76         if (IS_ERR(rt5033->regmap)) {
  77                 dev_err(&i2c->dev, "Failed to allocate register map.\n");
  78                 return PTR_ERR(rt5033->regmap);
  79         }
  80
  81         ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
  82         if (ret) {
  83                 dev_err(&i2c->dev, "Device not found\n");
  84                 return -ENODEV;
  85         }
  86         dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
  87
  88         ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
  89                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  90                         0, &rt5033_irq_chip, &rt5033->irq_data);
  91         if (ret) {
  92                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
  93                                                         rt5033->irq, ret);
  94                 return ret;
  95         }
  96
  97         ret = mfd_add_devices(rt5033->dev, -1, rt5033_devs,
  98                         ARRAY_SIZE(rt5033_devs), NULL, 0,
  99                         regmap_irq_get_domain(rt5033->irq_data));
 100         if (ret < 0) {
 101                 dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
 102                 return ret;
 103         }
 104
 105         device_init_wakeup(rt5033->dev, rt5033->wakeup);
 106
 107         return 0;
 108 }
 109
 110 static int rt5033_i2c_remove(struct i2c_client *i2c)
 111 {
 112         mfd_remove_devices(&i2c->dev);
 113
 114         return 0;
 115 }
 116
 117 static const struct i2c_device_id rt5033_i2c_id[] = {
 118         { "rt5033", },
 119         { }
 120 };
 121 MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
 122
 123 static const struct of_device_id rt5033_dt_match[] = {
 124         { .compatible = "richtek,rt5033", },
 125         { }
 126 };
 127 MODULE_DEVICE_TABLE(of, rt5033_dt_match);
 128
 129 static struct i2c_driver rt5033_driver = {
 130         .driver = {
 131                 .name = "rt5033",
 132                 .of_match_table = of_match_ptr(rt5033_dt_match),
 133         },
 134         .probe = rt5033_i2c_probe,
 135         .remove = rt5033_i2c_remove,
 136         .id_table = rt5033_i2c_id,
 137 };
 138 module_i2c_driver(rt5033_driver);
 139
 140 MODULE_ALIAS("i2c:rt5033");
 141 MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
 142 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 143 MODULE_LICENSE("GPL");