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/module.h>
  19 #include <linux/mfd/core.h>
  20 #include <linux/mfd/max77693-common.h>
  21 #include <linux/mfd/max77843-private.h>
  22 #include <linux/of_device.h>
  23 #include <linux/platform_device.h>
  24
  25 static const struct mfd_cell max77843_devs[] = {
  26         {
  27                 .name = "max77843-muic",
  28                 .of_compatible = "maxim,max77843-muic",
  29         }, {
  30                 .name = "max77843-regulator",
  31                 .of_compatible = "maxim,max77843-regulator",
  32         }, {
  33                 .name = "max77843-charger",
  34                 .of_compatible = "maxim,max77843-charger"
  35         }, {
  36                 .name = "max77843-fuelgauge",
  37                 .of_compatible = "maxim,max77843-fuelgauge",
  38         }, {
  39                 .name = "max77843-haptic",
  40                 .of_compatible = "maxim,max77843-haptic",
  41         },
  42 };
  43
  44 static const struct regmap_config max77843_charger_regmap_config = {
  45         .reg_bits       = 8,
  46         .val_bits       = 8,
  47         .max_register   = MAX77843_CHG_REG_END,
  48 };
  49
  50 static const struct regmap_config max77843_regmap_config = {
  51         .reg_bits       = 8,
  52         .val_bits       = 8,
  53         .max_register   = MAX77843_SYS_REG_END,
  54 };
  55
  56 static const struct regmap_irq max77843_irqs[] = {
  57         /* TOPSYS interrupts */
  58         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
  59         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
  60         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
  61         { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
  62 };
  63
  64 static const struct regmap_irq_chip max77843_irq_chip = {
  65         .name           = "max77843",
  66         .status_base    = MAX77843_SYS_REG_SYSINTSRC,
  67         .mask_base      = MAX77843_SYS_REG_SYSINTMASK,
  68         .mask_invert    = false,
  69         .num_regs       = 1,
  70         .irqs           = max77843_irqs,
  71         .num_irqs       = ARRAY_SIZE(max77843_irqs),
  72 };
  73
  74 /* Charger and Charger regulator use same regmap. */
  75 static int max77843_chg_init(struct max77693_dev *max77843)
  76 {
  77         int ret;
  78
  79         max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG);
  80         if (!max77843->i2c_chg) {
  81                 dev_err(&max77843->i2c->dev,
  82                                 "Cannot allocate I2C device for Charger\n");
  83                 return -ENODEV;
  84         }
  85         i2c_set_clientdata(max77843->i2c_chg, max77843);
  86
  87         max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
  88                         &max77843_charger_regmap_config);
  89         if (IS_ERR(max77843->regmap_chg)) {
  90                 ret = PTR_ERR(max77843->regmap_chg);
  91                 goto err_chg_i2c;
  92         }
  93
  94         return 0;
  95
  96 err_chg_i2c:
  97         i2c_unregister_device(max77843->i2c_chg);
  98
  99         return ret;
 100 }
 101
 102 static int max77843_probe(struct i2c_client *i2c,
 103                           const struct i2c_device_id *id)
 104 {
 105         struct max77693_dev *max77843;
 106         unsigned int reg_data;
 107         int ret;
 108
 109         max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
 110         if (!max77843)
 111                 return -ENOMEM;
 112
 113         i2c_set_clientdata(i2c, max77843);
 114         max77843->dev = &i2c->dev;
 115         max77843->i2c = i2c;
 116         max77843->irq = i2c->irq;
 117         max77843->type = id->driver_data;
 118
 119         max77843->regmap = devm_regmap_init_i2c(i2c,
 120                         &max77843_regmap_config);
 121         if (IS_ERR(max77843->regmap)) {
 122                 dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
 123                 return PTR_ERR(max77843->regmap);
 124         }
 125
 126         ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
 127                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 128                         0, &max77843_irq_chip, &max77843->irq_data_topsys);
 129         if (ret) {
 130                 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
 131                 return ret;
 132         }
 133
 134         ret = regmap_read(max77843->regmap,
 135                         MAX77843_SYS_REG_PMICID, &reg_data);
 136         if (ret < 0) {
 137                 dev_err(&i2c->dev, "Failed to read PMIC ID\n");
 138                 goto err_pmic_id;
 139         }
 140         dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
 141
 142         ret = max77843_chg_init(max77843);
 143         if (ret) {
 144                 dev_err(&i2c->dev, "Failed to init Charger\n");
 145                 goto err_pmic_id;
 146         }
 147
 148         ret = regmap_update_bits(max77843->regmap,
 149                                  MAX77843_SYS_REG_INTSRCMASK,
 150                                  MAX77843_INTSRC_MASK_MASK,
 151                                  (unsigned int)~MAX77843_INTSRC_MASK_MASK);
 152         if (ret < 0) {
 153                 dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
 154                 goto err_pmic_id;
 155         }
 156
 157         ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
 158                               ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
 159         if (ret < 0) {
 160                 dev_err(&i2c->dev, "Failed to add mfd device\n");
 161                 goto err_pmic_id;
 162         }
 163
 164         device_init_wakeup(max77843->dev, true);
 165
 166         return 0;
 167
 168 err_pmic_id:
 169         regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
 170
 171         return ret;
 172 }
 173
 174 static int max77843_remove(struct i2c_client *i2c)
 175 {
 176         struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
 177
 178         mfd_remove_devices(max77843->dev);
 179
 180         regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
 181
 182         i2c_unregister_device(max77843->i2c_chg);
 183
 184         return 0;
 185 }
 186
 187 static const struct of_device_id max77843_dt_match[] = {
 188         { .compatible = "maxim,max77843", },
 189         { },
 190 };
 191
 192 static const struct i2c_device_id max77843_id[] = {
 193         { "max77843", TYPE_MAX77843, },
 194         { },
 195 };
 196 MODULE_DEVICE_TABLE(i2c, max77843_id);
 197
 198 static int __maybe_unused max77843_suspend(struct device *dev)
 199 {
 200         struct i2c_client *i2c = to_i2c_client(dev);
 201         struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
 202
 203         disable_irq(max77843->irq);
 204         if (device_may_wakeup(dev))
 205                 enable_irq_wake(max77843->irq);
 206
 207         return 0;
 208 }
 209
 210 static int __maybe_unused max77843_resume(struct device *dev)
 211 {
 212         struct i2c_client *i2c = to_i2c_client(dev);
 213         struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
 214
 215         if (device_may_wakeup(dev))
 216                 disable_irq_wake(max77843->irq);
 217         enable_irq(max77843->irq);
 218
 219         return 0;
 220 }
 221
 222 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
 223
 224 static struct i2c_driver max77843_i2c_driver = {
 225         .driver = {
 226                 .name = "max77843",
 227                 .pm = &max77843_pm,
 228                 .of_match_table = max77843_dt_match,
 229         },
 230         .probe = max77843_probe,
 231         .remove = max77843_remove,
 232         .id_table = max77843_id,
 233 };
 234
 235 static int __init max77843_i2c_init(void)
 236 {
 237         return i2c_add_driver(&max77843_i2c_driver);
 238 }
 239 subsys_initcall(max77843_i2c_init);
 240
 241 static void __exit max77843_i2c_exit(void)
 242 {
 243         i2c_del_driver(&max77843_i2c_driver);
 244 }
 245 module_exit(max77843_i2c_exit);