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};
  41
  42static struct regmap_config max77686_regmap_config = {
  43        .reg_bits = 8,
  44        .val_bits = 8,
  45};
  46
  47#ifdef CONFIG_OF
  48static struct of_device_id max77686_pmic_dt_match[] = {
  49        {.compatible = "maxim,max77686",        .data = 0},
  50        {},
  51};
  52
  53static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  54                                                                  *dev)
  55{
  56        struct max77686_platform_data *pd;
  57
  58        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
  59        if (!pd) {
  60                dev_err(dev, "could not allocate memory for pdata\n");
  61                return NULL;
  62        }
  63
  64        dev->platform_data = pd;
  65        return pd;
  66}
  67#else
  68static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  69                                                                  *dev)
  70{
  71        return 0;
  72}
  73#endif
  74
  75static int max77686_i2c_probe(struct i2c_client *i2c,
  76                              const struct i2c_device_id *id)
  77{
  78        struct max77686_dev *max77686 = NULL;
  79        struct max77686_platform_data *pdata = i2c->dev.platform_data;
  80        unsigned int data;
  81        int ret = 0;
  82
  83        if (i2c->dev.of_node)
  84                pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
  85
  86        if (!pdata) {
  87                ret = -EIO;
  88                dev_err(&i2c->dev, "No platform data found.\n");
  89                goto err;
  90        }
  91
  92        max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
  93        if (max77686 == NULL)
  94                return -ENOMEM;
  95
  96        i2c_set_clientdata(i2c, max77686);
  97        max77686->dev = &i2c->dev;
  98        max77686->i2c = i2c;
  99        max77686->type = id->driver_data;
 100
 101        max77686->wakeup = pdata->wakeup;
 102        max77686->irq_gpio = pdata->irq_gpio;
 103        max77686->irq = i2c->irq;
 104
 105        max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config);
 106        if (IS_ERR(max77686->regmap)) {
 107                ret = PTR_ERR(max77686->regmap);
 108                dev_err(max77686->dev, "Failed to allocate register map: %d\n",
 109                                ret);
 110                kfree(max77686);
 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                ret = -ENODEV;
 119                goto err;
 120        } else
 121                dev_info(max77686->dev, "device found\n");
 122
 123        max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
 124        i2c_set_clientdata(max77686->rtc, max77686);
 125
 126        max77686_irq_init(max77686);
 127
 128        ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
 129                              ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
 130
 131        if (ret < 0)
 132                goto err_mfd;
 133
 134        return ret;
 135
 136err_mfd:
 137        mfd_remove_devices(max77686->dev);
 138        i2c_unregister_device(max77686->rtc);
 139err:
 140        kfree(max77686);
 141        return ret;
 142}
 143
 144static int max77686_i2c_remove(struct i2c_client *i2c)
 145{
 146        struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
 147
 148        mfd_remove_devices(max77686->dev);
 149        i2c_unregister_device(max77686->rtc);
 150        kfree(max77686);
 151
 152        return 0;
 153}
 154
 155static const struct i2c_device_id max77686_i2c_id[] = {
 156        { "max77686", TYPE_MAX77686 },
 157        { }
 158};
 159MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
 160
 161static struct i2c_driver max77686_i2c_driver = {
 162        .driver = {
 163                   .name = "max77686",
 164                   .owner = THIS_MODULE,
 165                   .of_match_table = of_match_ptr(max77686_pmic_dt_match),
 166        },
 167        .probe = max77686_i2c_probe,
 168        .remove = max77686_i2c_remove,
 169        .id_table = max77686_i2c_id,
 170};
 171
 172static int __init max77686_i2c_init(void)
 173{
 174        return i2c_add_driver(&max77686_i2c_driver);
 175}
 176/* init early so consumer devices can complete system boot */
 177subsys_initcall(max77686_i2c_init);
 178
 179static void __exit max77686_i2c_exit(void)
 180{
 181        i2c_del_driver(&max77686_i2c_driver);
 182}
 183module_exit(max77686_i2c_exit);
 184
 185MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
 186MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 187MODULE_LICENSE("GPL");
 188
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