drivers/mfd/max77843.c

   1 /*
   2  * MFD core driver for the Maxim MAX77843
   3  *
   4  * Copyright (C) 2015 Samsung Electronics
   5  * Author: Jaewon Kim <jaewon02.kim@samsung.com>
   6  * Author: Beomho Seo <beomho.seo@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/err.h>
  15 #include <linux/i2c.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/max77693-common.h>
  20 #include <linux/mfd/max77843-private.h>
  21 #include <linux/of_device.h>
  22 #include <linux/platform_device.h>
  23
  24 static const struct mfd_cell max77843_devs[] = {
  25         {
  26                 .name = "max77843-muic",
  27                 .of_compatible = "maxim,max77843-muic",
  28         }, {
  29                 .name = "max77843-regulator",
  30                 .of_compatible = "maxim,max77843-regulator",
  31         }, {
  32                 .name = "max77843-charger",
  33                 .of_compatible = "maxim,max77843-charger"
  34         }, {
  35                 .name = "max77843-fuelgauge",
  36                 .of_compatible = "maxim,max77843-fuelgauge",
  37         }, {
  38                 .name = "max77843-haptic",
  39                 .of_compatible = "maxim,max77843-haptic",
  40         },
  41 };
  42
  43 static const struct regmap_config max77843_charger_regmap_config = {
  44         .reg_bits       = 8,
  45         .val_bits       = 8,
  46         .max_register   = MAX77843_CHG_REG_END,
  47 };
  48
  49 static const struct regmap_config max77843_regmap_config = {
  50         .reg_bits       = 8,
  51         .val_bits       = 8,
  52         .max_register   = MAX77843_SYS_REG_END,
  53 };
  54
  55 static const struct regmap_irq max77843_irqs[] = {
  56         /* TOPSYS interrupts */
  57         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
  58         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
  59         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
  60         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
  61 };
  62
  63 static const struct regmap_irq_chip max77843_irq_chip = {
  64         .name           = "max77843",
  65         .status_base    = MAX77843_SYS_REG_SYSINTSRC,
  66         .mask_base      = MAX77843_SYS_REG_SYSINTMASK,
  67         .mask_invert    = false,
  68         .num_regs       = 1,
  69         .irqs           = max77843_irqs,
  70         .num_irqs       = ARRAY_SIZE(max77843_irqs),
  71 };
  72
  73 /* Charger and Charger regulator use same regmap. */
  74 static int max77843_chg_init(struct max77693_dev *max77843)
  75 {
  76         int ret;
  77
  78         max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG);
  79         if (!max77843->i2c_chg) {
  80                 dev_err(&max77843->i2c->dev,
  81                                 "Cannot allocate I2C device for Charger\n");
  82                 return -ENODEV;
  83         }
  84         i2c_set_clientdata(max77843->i2c_chg, max77843);
  85
  86         max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
  87                         &max77843_charger_regmap_config);
  88         if (IS_ERR(max77843->regmap_chg)) {
  89                 ret = PTR_ERR(max77843->regmap_chg);
  90                 goto err_chg_i2c;
  91         }
  92
  93         return 0;
  94
  95 err_chg_i2c:
  96         i2c_unregister_device(max77843->i2c_chg);
  97
  98         return ret;
  99 }
 100
 101 static int max77843_probe(struct i2c_client *i2c,
 102                           const struct i2c_device_id *id)
 103 {
 104         struct max77693_dev *max77843;
 105         unsigned int reg_data;
 106         int ret;
 107
 108         max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
 109         if (!max77843)
 110                 return -ENOMEM;
 111
 112         i2c_set_clientdata(i2c, max77843);
 113         max77843->dev = &i2c->dev;
 114         max77843->i2c = i2c;
 115         max77843->irq = i2c->irq;
 116         max77843->type = id->driver_data;
 117
 118         max77843->regmap = devm_regmap_init_i2c(i2c,
 119                         &max77843_regmap_config);
 120         if (IS_ERR(max77843->regmap)) {
 121                 dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
 122                 return PTR_ERR(max77843->regmap);
 123         }
 124
 125         ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
 126                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 127                         0, &max77843_irq_chip, &max77843->irq_data_topsys);
 128         if (ret) {
 129                 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
 130                 return ret;
 131         }
 132
 133         ret = regmap_read(max77843->regmap,
 134                         MAX77843_SYS_REG_PMICID, &reg_data);
 135         if (ret < 0) {
 136                 dev_err(&i2c->dev, "Failed to read PMIC ID\n");
 137                 goto err_pmic_id;
 138         }
 139         dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
 140
 141         ret = max77843_chg_init(max77843);
 142         if (ret) {
 143                 dev_err(&i2c->dev, "Failed to init Charger\n");
 144                 goto err_pmic_id;
 145         }
 146
 147         ret = regmap_update_bits(max77843->regmap,
 148                                  MAX77843_SYS_REG_INTSRCMASK,
 149                                  MAX77843_INTSRC_MASK_MASK,
 150                                  (unsigned int)~MAX77843_INTSRC_MASK_MASK);
 151         if (ret < 0) {
 152                 dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
 153                 goto err_pmic_id;
 154         }
 155
 156         ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
 157                               ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
 158         if (ret < 0) {
 159                 dev_err(&i2c->dev, "Failed to add mfd device\n");
 160                 goto err_pmic_id;
 161         }
 162
 163         device_init_wakeup(max77843->dev, true);
 164
 165         return 0;
 166
 167 err_pmic_id:
 168         regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
 169
 170         return ret;
 171 }
 172
 173 static const struct of_device_id max77843_dt_match[] = {
 174         { .compatible = "maxim,max77843", },
 175         { },
 176 };
 177
 178 static const struct i2c_device_id max77843_id[] = {
 179         { "max77843", TYPE_MAX77843, },
 180         { },
 181 };
 182
 183 static int __maybe_unused max77843_suspend(struct device *dev)
 184 {
 185         struct i2c_client *i2c = to_i2c_client(dev);
 186         struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
 187
 188         disable_irq(max77843->irq);
 189         if (device_may_wakeup(dev))
 190                 enable_irq_wake(max77843->irq);
 191
 192         return 0;
 193 }
 194
 195 static int __maybe_unused max77843_resume(struct device *dev)
 196 {
 197         struct i2c_client *i2c = to_i2c_client(dev);
 198         struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
 199
 200         if (device_may_wakeup(dev))
 201                 disable_irq_wake(max77843->irq);
 202         enable_irq(max77843->irq);
 203
 204         return 0;
 205 }
 206
 207 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
 208
 209 static struct i2c_driver max77843_i2c_driver = {
 210         .driver = {
 211                 .name = "max77843",
 212                 .pm = &max77843_pm,
 213                 .of_match_table = max77843_dt_match,
 214                 .suppress_bind_attrs = true,
 215         },
 216         .probe = max77843_probe,
 217         .id_table = max77843_id,
 218 };
 219
 220 static int __init max77843_i2c_init(void)
 221 {
 222         return i2c_add_driver(&max77843_i2c_driver);
 223 }
 224 subsys_initcall(max77843_i2c_init);