linux/drivers/mfd/max77686.c
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   1/*
   2 * max77686.c - mfd core driver for the Maxim 77686
   3 *
   4 * Copyright (C) 2012 Samsung Electronics
   5 * Chiwoong Byun <woong.byun@smasung.com>
   6 * Jonghwa Lee <jonghwa3.lee@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 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 *
  22 * This driver is based on max8997.c
  23 */
  24
  25#include <linux/export.h>
  26#include <linux/slab.h>
  27#include <linux/i2c.h>
  28#include <linux/pm_runtime.h>
  29#include <linux/module.h>
  30#include <linux/mfd/core.h>
  31#include <linux/mfd/max77686.h>
  32#include <linux/mfd/max77686-private.h>
  33#include <linux/err.h>
  34
  35#define I2C_ADDR_RTC    (0x0C >> 1)
  36
  37static struct mfd_cell max77686_devs[] = {
  38        { .name = "max77686-pmic", },
  39        { .name = "max77686-rtc", },
  40        { .name = "max77686-clk", },
  41};
  42
  43static struct regmap_config max77686_regmap_config = {
  44        .reg_bits = 8,
  45        .val_bits = 8,
  46};
  47
  48#ifdef CONFIG_OF
  49static struct of_device_id max77686_pmic_dt_match[] = {
  50        {.compatible = "maxim,max77686", .data = NULL},
  51        {},
  52};
  53
  54static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  55                                                                  *dev)
  56{
  57        struct max77686_platform_data *pd;
  58
  59        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
  60        if (!pd) {
  61                dev_err(dev, "could not allocate memory for pdata\n");
  62                return NULL;
  63        }
  64
  65        dev->platform_data = pd;
  66        return pd;
  67}
  68#else
  69static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  70                                                                  *dev)
  71{
  72        return 0;
  73}
  74#endif
  75
  76static int max77686_i2c_probe(struct i2c_client *i2c,
  77                              const struct i2c_device_id *id)
  78{
  79        struct max77686_dev *max77686 = NULL;
  80        struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
  81        unsigned int data;
  82        int ret = 0;
  83
  84        if (i2c->dev.of_node)
  85                pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
  86
  87        if (!pdata) {
  88                dev_err(&i2c->dev, "No platform data found.\n");
  89                return -EIO;
  90        }
  91
  92        max77686 = devm_kzalloc(&i2c->dev,
  93                                sizeof(struct max77686_dev), GFP_KERNEL);
  94        if (max77686 == NULL)
  95                return -ENOMEM;
  96
  97        i2c_set_clientdata(i2c, max77686);
  98        max77686->dev = &i2c->dev;
  99        max77686->i2c = i2c;
 100        max77686->type = id->driver_data;
 101
 102        max77686->wakeup = pdata->wakeup;
 103        max77686->irq_gpio = pdata->irq_gpio;
 104        max77686->irq = i2c->irq;
 105
 106        max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config);
 107        if (IS_ERR(max77686->regmap)) {
 108                ret = PTR_ERR(max77686->regmap);
 109                dev_err(max77686->dev, "Failed to allocate register map: %d\n",
 110                                ret);
 111                return ret;
 112        }
 113
 114        if (regmap_read(max77686->regmap,
 115                         MAX77686_REG_DEVICE_ID, &data) < 0) {
 116                dev_err(max77686->dev,
 117                        "device not found on this channel (this is not an error)\n");
 118                return -ENODEV;
 119        } else
 120                dev_info(max77686->dev, "device found\n");
 121
 122        max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
 123        i2c_set_clientdata(max77686->rtc, max77686);
 124
 125        max77686_irq_init(max77686);
 126
 127        ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
 128                              ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
 129        if (ret < 0) {
 130                mfd_remove_devices(max77686->dev);
 131                i2c_unregister_device(max77686->rtc);
 132        }
 133
 134        return ret;
 135}
 136
 137static int max77686_i2c_remove(struct i2c_client *i2c)
 138{
 139        struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
 140
 141        mfd_remove_devices(max77686->dev);
 142        i2c_unregister_device(max77686->rtc);
 143
 144        return 0;
 145}
 146
 147static const struct i2c_device_id max77686_i2c_id[] = {
 148        { "max77686", TYPE_MAX77686 },
 149        { }
 150};
 151MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
 152
 153static struct i2c_driver max77686_i2c_driver = {
 154        .driver = {
 155                   .name = "max77686",
 156                   .owner = THIS_MODULE,
 157                   .of_match_table = of_match_ptr(max77686_pmic_dt_match),
 158        },
 159        .probe = max77686_i2c_probe,
 160        .remove = max77686_i2c_remove,
 161        .id_table = max77686_i2c_id,
 162};
 163
 164static int __init max77686_i2c_init(void)
 165{
 166        return i2c_add_driver(&max77686_i2c_driver);
 167}
 168/* init early so consumer devices can complete system boot */
 169subsys_initcall(max77686_i2c_init);
 170
 171static void __exit max77686_i2c_exit(void)
 172{
 173        i2c_del_driver(&max77686_i2c_driver);
 174}
 175module_exit(max77686_i2c_exit);
 176
 177MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
 178MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 179MODULE_LICENSE("GPL");
 180
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