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                 .name = "rt5033-led",
  52                 .of_compatible = "richtek,rt5033-led",
  53         },
  54 };
  55
  56 static const struct regmap_config rt5033_regmap_config = {
  57         .reg_bits       = 8,
  58         .val_bits       = 8,
  59         .max_register   = RT5033_REG_END,
  60 };
  61
  62 static int rt5033_i2c_probe(struct i2c_client *i2c,
  63                                 const struct i2c_device_id *id)
  64 {
  65         struct rt5033_dev *rt5033;
  66         unsigned int dev_id;
  67         int ret;
  68
  69         rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
  70         if (!rt5033)
  71                 return -ENOMEM;
  72
  73         i2c_set_clientdata(i2c, rt5033);
  74         rt5033->dev = &i2c->dev;
  75         rt5033->irq = i2c->irq;
  76         rt5033->wakeup = true;
  77
  78         rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
  79         if (IS_ERR(rt5033->regmap)) {
  80                 dev_err(&i2c->dev, "Failed to allocate register map.\n");
  81                 return PTR_ERR(rt5033->regmap);
  82         }
  83
  84         ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
  85         if (ret) {
  86                 dev_err(&i2c->dev, "Device not found\n");
  87                 return -ENODEV;
  88         }
  89         dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
  90
  91         ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
  92                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  93                         0, &rt5033_irq_chip, &rt5033->irq_data);
  94         if (ret) {
  95                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
  96                                                         rt5033->irq, ret);
  97                 return ret;
  98         }
  99
 100         ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs,
 101                                    ARRAY_SIZE(rt5033_devs), NULL, 0,
 102                                    regmap_irq_get_domain(rt5033->irq_data));
 103         if (ret < 0) {
 104                 dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
 105                 return ret;
 106         }
 107
 108         device_init_wakeup(rt5033->dev, rt5033->wakeup);
 109
 110         return 0;
 111 }
 112
 113 static const struct i2c_device_id rt5033_i2c_id[] = {
 114         { "rt5033", },
 115         { }
 116 };
 117 MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
 118
 119 static const struct of_device_id rt5033_dt_match[] = {
 120         { .compatible = "richtek,rt5033", },
 121         { }
 122 };
 123 MODULE_DEVICE_TABLE(of, rt5033_dt_match);
 124
 125 static struct i2c_driver rt5033_driver = {
 126         .driver = {
 127                 .name = "rt5033",
 128                 .of_match_table = of_match_ptr(rt5033_dt_match),
 129         },
 130         .probe = rt5033_i2c_probe,
 131         .id_table = rt5033_i2c_id,
 132 };
 133 module_i2c_driver(rt5033_driver);
 134
 135 MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
 136 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 137 MODULE_LICENSE("GPL");