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/pm_runtime.h>
  32#include <linux/mutex.h>
  33#include <linux/mfd/core.h>
  34#include <linux/mfd/max77693.h>
  35#include <linux/mfd/max77693-private.h>
  36#include <linux/regulator/machine.h>
  37#include <linux/regmap.h>
  38
  39#define I2C_ADDR_PMIC   (0xCC >> 1)     /* Charger, Flash LED */
  40#define I2C_ADDR_MUIC   (0x4A >> 1)
  41#define I2C_ADDR_HAPTIC (0x90 >> 1)
  42
  43static struct mfd_cell max77693_devs[] = {
  44        { .name = "max77693-pmic", },
  45        { .name = "max77693-charger", },
  46        { .name = "max77693-flash", },
  47        { .name = "max77693-muic", },
  48        { .name = "max77693-haptic", },
  49};
  50
  51int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
  52{
  53        unsigned int val;
  54        int ret;
  55
  56        ret = regmap_read(map, reg, &val);
  57        *dest = val;
  58
  59        return ret;
  60}
  61EXPORT_SYMBOL_GPL(max77693_read_reg);
  62
  63int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
  64{
  65        int ret;
  66
  67        ret = regmap_bulk_read(map, reg, buf, count);
  68
  69        return ret;
  70}
  71EXPORT_SYMBOL_GPL(max77693_bulk_read);
  72
  73int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
  74{
  75        int ret;
  76
  77        ret = regmap_write(map, reg, value);
  78
  79        return ret;
  80}
  81EXPORT_SYMBOL_GPL(max77693_write_reg);
  82
  83int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
  84{
  85        int ret;
  86
  87        ret = regmap_bulk_write(map, reg, buf, count);
  88
  89        return ret;
  90}
  91EXPORT_SYMBOL_GPL(max77693_bulk_write);
  92
  93int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
  94{
  95        int ret;
  96
  97        ret = regmap_update_bits(map, reg, mask, val);
  98
  99        return ret;
 100}
 101EXPORT_SYMBOL_GPL(max77693_update_reg);
 102
 103static const struct regmap_config max77693_regmap_config = {
 104        .reg_bits = 8,
 105        .val_bits = 8,
 106        .max_register = MAX77693_PMIC_REG_END,
 107};
 108
 109static int max77693_i2c_probe(struct i2c_client *i2c,
 110                              const struct i2c_device_id *id)
 111{
 112        struct max77693_dev *max77693;
 113        struct max77693_platform_data *pdata = i2c->dev.platform_data;
 114        u8 reg_data;
 115        int ret = 0;
 116
 117        max77693 = devm_kzalloc(&i2c->dev,
 118                        sizeof(struct max77693_dev), GFP_KERNEL);
 119        if (max77693 == NULL)
 120                return -ENOMEM;
 121
 122        max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 123        if (IS_ERR(max77693->regmap)) {
 124                ret = PTR_ERR(max77693->regmap);
 125                dev_err(max77693->dev,"failed to allocate register map: %d\n",
 126                                ret);
 127                goto err_regmap;
 128        }
 129
 130        i2c_set_clientdata(i2c, max77693);
 131        max77693->dev = &i2c->dev;
 132        max77693->i2c = i2c;
 133        max77693->irq = i2c->irq;
 134        max77693->type = id->driver_data;
 135
 136        if (!pdata)
 137                goto err_regmap;
 138
 139        max77693->wakeup = pdata->wakeup;
 140
 141        if (max77693_read_reg(max77693->regmap,
 142                                MAX77693_PMIC_REG_PMIC_ID2, &reg_data) < 0) {
 143                dev_err(max77693->dev, "device not found on this channel\n");
 144                ret = -ENODEV;
 145                goto err_regmap;
 146        } else
 147                dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
 148
 149        max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 150        i2c_set_clientdata(max77693->muic, max77693);
 151
 152        max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 153        i2c_set_clientdata(max77693->haptic, max77693);
 154
 155        /*
 156         * Initialize register map for MUIC device because use regmap-muic
 157         * instance of MUIC device when irq of max77693 is initialized
 158         * before call max77693-muic probe() function.
 159         */
 160        max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
 161                                         &max77693_regmap_config);
 162        if (IS_ERR(max77693->regmap_muic)) {
 163                ret = PTR_ERR(max77693->regmap_muic);
 164                dev_err(max77693->dev,
 165                        "failed to allocate register map: %d\n", ret);
 166                goto err_regmap;
 167        }
 168
 169        ret = max77693_irq_init(max77693);
 170        if (ret < 0)
 171                goto err_irq;
 172
 173        pm_runtime_set_active(max77693->dev);
 174
 175        ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
 176                              ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
 177        if (ret < 0)
 178                goto err_mfd;
 179
 180        device_init_wakeup(max77693->dev, pdata->wakeup);
 181
 182        return ret;
 183
 184err_mfd:
 185        max77693_irq_exit(max77693);
 186err_irq:
 187        i2c_unregister_device(max77693->muic);
 188        i2c_unregister_device(max77693->haptic);
 189err_regmap:
 190        return ret;
 191}
 192
 193static int max77693_i2c_remove(struct i2c_client *i2c)
 194{
 195        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 196
 197        mfd_remove_devices(max77693->dev);
 198        max77693_irq_exit(max77693);
 199        i2c_unregister_device(max77693->muic);
 200        i2c_unregister_device(max77693->haptic);
 201
 202        return 0;
 203}
 204
 205static const struct i2c_device_id max77693_i2c_id[] = {
 206        { "max77693", TYPE_MAX77693 },
 207        { }
 208};
 209MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 210
 211static int max77693_suspend(struct device *dev)
 212{
 213        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 214        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 215
 216        if (device_may_wakeup(dev))
 217                irq_set_irq_wake(max77693->irq, 1);
 218        return 0;
 219}
 220
 221static int max77693_resume(struct device *dev)
 222{
 223        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 224        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 225
 226        if (device_may_wakeup(dev))
 227                irq_set_irq_wake(max77693->irq, 0);
 228        return max77693_irq_resume(max77693);
 229}
 230
 231static const struct dev_pm_ops max77693_pm = {
 232        .suspend = max77693_suspend,
 233        .resume = max77693_resume,
 234};
 235
 236static struct i2c_driver max77693_i2c_driver = {
 237        .driver = {
 238                   .name = "max77693",
 239                   .owner = THIS_MODULE,
 240                   .pm = &max77693_pm,
 241        },
 242        .probe = max77693_i2c_probe,
 243        .remove = max77693_i2c_remove,
 244        .id_table = max77693_i2c_id,
 245};
 246
 247static int __init max77693_i2c_init(void)
 248{
 249        return i2c_add_driver(&max77693_i2c_driver);
 250}
 251/* init early so consumer devices can complete system boot */
 252subsys_initcall(max77693_i2c_init);
 253
 254static void __exit max77693_i2c_exit(void)
 255{
 256        i2c_del_driver(&max77693_i2c_driver);
 257}
 258module_exit(max77693_i2c_exit);
 259
 260MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
 261MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
 262MODULE_LICENSE("GPL");
 263
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