linux/drivers/mfd/max77693.c
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   1/*
   2 * max77693.c - mfd core driver for the MAX 77693
   3 *
   4 * Copyright (C) 2012 Samsung Electronics
   5 * SangYoung Son <hello.son@smasung.com>
   6 *
   7 * This program is not provided / owned by Maxim Integrated Products.
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22 *
  23 * This driver is based on max8997.c
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/slab.h>
  28#include <linux/i2c.h>
  29#include <linux/err.h>
  30#include <linux/interrupt.h>
  31#include <linux/of.h>
  32#include <linux/pm_runtime.h>
  33#include <linux/mutex.h>
  34#include <linux/mfd/core.h>
  35#include <linux/mfd/max77693.h>
  36#include <linux/mfd/max77693-private.h>
  37#include <linux/regulator/machine.h>
  38#include <linux/regmap.h>
  39
  40#define I2C_ADDR_PMIC   (0xCC >> 1)     /* Charger, Flash LED */
  41#define I2C_ADDR_MUIC   (0x4A >> 1)
  42#define I2C_ADDR_HAPTIC (0x90 >> 1)
  43
  44static const struct mfd_cell max77693_devs[] = {
  45        { .name = "max77693-pmic", },
  46        { .name = "max77693-charger", },
  47        { .name = "max77693-flash", },
  48        { .name = "max77693-muic", },
  49        { .name = "max77693-haptic", },
  50};
  51
  52int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
  53{
  54        unsigned int val;
  55        int ret;
  56
  57        ret = regmap_read(map, reg, &val);
  58        *dest = val;
  59
  60        return ret;
  61}
  62EXPORT_SYMBOL_GPL(max77693_read_reg);
  63
  64int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
  65{
  66        int ret;
  67
  68        ret = regmap_bulk_read(map, reg, buf, count);
  69
  70        return ret;
  71}
  72EXPORT_SYMBOL_GPL(max77693_bulk_read);
  73
  74int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
  75{
  76        int ret;
  77
  78        ret = regmap_write(map, reg, value);
  79
  80        return ret;
  81}
  82EXPORT_SYMBOL_GPL(max77693_write_reg);
  83
  84int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
  85{
  86        int ret;
  87
  88        ret = regmap_bulk_write(map, reg, buf, count);
  89
  90        return ret;
  91}
  92EXPORT_SYMBOL_GPL(max77693_bulk_write);
  93
  94int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
  95{
  96        int ret;
  97
  98        ret = regmap_update_bits(map, reg, mask, val);
  99
 100        return ret;
 101}
 102EXPORT_SYMBOL_GPL(max77693_update_reg);
 103
 104static const struct regmap_config max77693_regmap_config = {
 105        .reg_bits = 8,
 106        .val_bits = 8,
 107        .max_register = MAX77693_PMIC_REG_END,
 108};
 109
 110static const struct regmap_config max77693_regmap_muic_config = {
 111        .reg_bits = 8,
 112        .val_bits = 8,
 113        .max_register = MAX77693_MUIC_REG_END,
 114};
 115
 116static int max77693_i2c_probe(struct i2c_client *i2c,
 117                              const struct i2c_device_id *id)
 118{
 119        struct max77693_dev *max77693;
 120        u8 reg_data;
 121        int ret = 0;
 122
 123        max77693 = devm_kzalloc(&i2c->dev,
 124                        sizeof(struct max77693_dev), GFP_KERNEL);
 125        if (max77693 == NULL)
 126                return -ENOMEM;
 127
 128        i2c_set_clientdata(i2c, max77693);
 129        max77693->dev = &i2c->dev;
 130        max77693->i2c = i2c;
 131        max77693->irq = i2c->irq;
 132        max77693->type = id->driver_data;
 133
 134        max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 135        if (IS_ERR(max77693->regmap)) {
 136                ret = PTR_ERR(max77693->regmap);
 137                dev_err(max77693->dev, "failed to allocate register map: %d\n",
 138                                ret);
 139                return ret;
 140        }
 141
 142        ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
 143                                &reg_data);
 144        if (ret < 0) {
 145                dev_err(max77693->dev, "device not found on this channel\n");
 146                return ret;
 147        } else
 148                dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
 149
 150        max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 151        if (!max77693->muic) {
 152                dev_err(max77693->dev, "Failed to allocate I2C device for MUIC\n");
 153                return -ENODEV;
 154        }
 155        i2c_set_clientdata(max77693->muic, max77693);
 156
 157        max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 158        if (!max77693->haptic) {
 159                dev_err(max77693->dev, "Failed to allocate I2C device for Haptic\n");
 160                ret = -ENODEV;
 161                goto err_i2c_haptic;
 162        }
 163        i2c_set_clientdata(max77693->haptic, max77693);
 164
 165        /*
 166         * Initialize register map for MUIC device because use regmap-muic
 167         * instance of MUIC device when irq of max77693 is initialized
 168         * before call max77693-muic probe() function.
 169         */
 170        max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
 171                                         &max77693_regmap_muic_config);
 172        if (IS_ERR(max77693->regmap_muic)) {
 173                ret = PTR_ERR(max77693->regmap_muic);
 174                dev_err(max77693->dev,
 175                        "failed to allocate register map: %d\n", ret);
 176                goto err_regmap_muic;
 177        }
 178
 179        ret = max77693_irq_init(max77693);
 180        if (ret < 0)
 181                goto err_irq;
 182
 183        pm_runtime_set_active(max77693->dev);
 184
 185        ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
 186                              ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
 187        if (ret < 0)
 188                goto err_mfd;
 189
 190        return ret;
 191
 192err_mfd:
 193        max77693_irq_exit(max77693);
 194err_irq:
 195err_regmap_muic:
 196        i2c_unregister_device(max77693->haptic);
 197err_i2c_haptic:
 198        i2c_unregister_device(max77693->muic);
 199        return ret;
 200}
 201
 202static int max77693_i2c_remove(struct i2c_client *i2c)
 203{
 204        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 205
 206        mfd_remove_devices(max77693->dev);
 207        max77693_irq_exit(max77693);
 208        i2c_unregister_device(max77693->muic);
 209        i2c_unregister_device(max77693->haptic);
 210
 211        return 0;
 212}
 213
 214static const struct i2c_device_id max77693_i2c_id[] = {
 215        { "max77693", TYPE_MAX77693 },
 216        { }
 217};
 218MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 219
 220static int max77693_suspend(struct device *dev)
 221{
 222        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 223        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 224
 225        if (device_may_wakeup(dev))
 226                irq_set_irq_wake(max77693->irq, 1);
 227        return 0;
 228}
 229
 230static int max77693_resume(struct device *dev)
 231{
 232        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 233        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 234
 235        if (device_may_wakeup(dev))
 236                irq_set_irq_wake(max77693->irq, 0);
 237        return max77693_irq_resume(max77693);
 238}
 239
 240static const struct dev_pm_ops max77693_pm = {
 241        .suspend = max77693_suspend,
 242        .resume = max77693_resume,
 243};
 244
 245#ifdef CONFIG_OF
 246static const struct of_device_id max77693_dt_match[] = {
 247        { .compatible = "maxim,max77693" },
 248        {},
 249};
 250#endif
 251
 252static struct i2c_driver max77693_i2c_driver = {
 253        .driver = {
 254                   .name = "max77693",
 255                   .owner = THIS_MODULE,
 256                   .pm = &max77693_pm,
 257                   .of_match_table = of_match_ptr(max77693_dt_match),
 258        },
 259        .probe = max77693_i2c_probe,
 260        .remove = max77693_i2c_remove,
 261        .id_table = max77693_i2c_id,
 262};
 263
 264static int __init max77693_i2c_init(void)
 265{
 266        return i2c_add_driver(&max77693_i2c_driver);
 267}
 268/* init early so consumer devices can complete system boot */
 269subsys_initcall(max77693_i2c_init);
 270
 271static void __exit max77693_i2c_exit(void)
 272{
 273        i2c_del_driver(&max77693_i2c_driver);
 274}
 275module_exit(max77693_i2c_exit);
 276
 277MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
 278MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
 279MODULE_LICENSE("GPL");
 280
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