drivers/mfd/max77686.c

   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 #include <linux/of.h>
  35
  36 #define I2C_ADDR_RTC    (0x0C >> 1)
  37
  38 static const struct mfd_cell max77686_devs[] = {
  39         { .name = "max77686-pmic", },
  40         { .name = "max77686-rtc", },
  41         { .name = "max77686-clk", },
  42 };
  43
  44 static struct regmap_config max77686_regmap_config = {
  45         .reg_bits = 8,
  46         .val_bits = 8,
  47 };
  48
  49 #ifdef CONFIG_OF
  50 static const struct of_device_id max77686_pmic_dt_match[] = {
  51         {.compatible = "maxim,max77686", .data = NULL},
  52         {},
  53 };
  54
  55 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  56                                                                   *dev)
  57 {
  58         struct max77686_platform_data *pd;
  59
  60         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
  61         if (!pd) {
  62                 dev_err(dev, "could not allocate memory for pdata\n");
  63                 return NULL;
  64         }
  65
  66         dev->platform_data = pd;
  67         return pd;
  68 }
  69 #else
  70 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  71                                                                   *dev)
  72 {
  73         return 0;
  74 }
  75 #endif
  76
  77 static int max77686_i2c_probe(struct i2c_client *i2c,
  78                               const struct i2c_device_id *id)
  79 {
  80         struct max77686_dev *max77686 = NULL;
  81         struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
  82         unsigned int data;
  83         int ret = 0;
  84
  85         if (i2c->dev.of_node)
  86                 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
  87
  88         if (!pdata) {
  89                 dev_err(&i2c->dev, "No platform data found.\n");
  90                 return -EIO;
  91         }
  92
  93         max77686 = devm_kzalloc(&i2c->dev,
  94                                 sizeof(struct max77686_dev), GFP_KERNEL);
  95         if (max77686 == NULL)
  96                 return -ENOMEM;
  97
  98         i2c_set_clientdata(i2c, max77686);
  99         max77686->dev = &i2c->dev;
 100         max77686->i2c = i2c;
 101         max77686->type = id->driver_data;
 102
 103         max77686->wakeup = pdata->wakeup;
 104         max77686->irq_gpio = pdata->irq_gpio;
 105         max77686->irq = i2c->irq;
 106
 107         max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
 108         if (IS_ERR(max77686->regmap)) {
 109                 ret = PTR_ERR(max77686->regmap);
 110                 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
 111                                 ret);
 112                 return ret;
 113         }
 114
 115         if (regmap_read(max77686->regmap,
 116                          MAX77686_REG_DEVICE_ID, &data) < 0) {
 117                 dev_err(max77686->dev,
 118                         "device not found on this channel (this is not an error)\n");
 119                 return -ENODEV;
 120         } else
 121                 dev_info(max77686->dev, "device found\n");
 122
 123         max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
 124         if (!max77686->rtc) {
 125                 dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
 126                 return -ENODEV;
 127         }
 128         i2c_set_clientdata(max77686->rtc, max77686);
 129
 130         max77686_irq_init(max77686);
 131
 132         ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
 133                               ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
 134         if (ret < 0) {
 135                 mfd_remove_devices(max77686->dev);
 136                 i2c_unregister_device(max77686->rtc);
 137         }
 138
 139         return ret;
 140 }
 141
 142 static int max77686_i2c_remove(struct i2c_client *i2c)
 143 {
 144         struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
 145
 146         mfd_remove_devices(max77686->dev);
 147         i2c_unregister_device(max77686->rtc);
 148
 149         return 0;
 150 }
 151
 152 static const struct i2c_device_id max77686_i2c_id[] = {
 153         { "max77686", TYPE_MAX77686 },
 154         { }
 155 };
 156 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
 157
 158 static struct i2c_driver max77686_i2c_driver = {
 159         .driver = {
 160                    .name = "max77686",
 161                    .owner = THIS_MODULE,
 162                    .of_match_table = of_match_ptr(max77686_pmic_dt_match),
 163         },
 164         .probe = max77686_i2c_probe,
 165         .remove = max77686_i2c_remove,
 166         .id_table = max77686_i2c_id,
 167 };
 168
 169 static int __init max77686_i2c_init(void)
 170 {
 171         return i2c_add_driver(&max77686_i2c_driver);
 172 }
 173 /* init early so consumer devices can complete system boot */
 174 subsys_initcall(max77686_i2c_init);
 175
 176 static void __exit max77686_i2c_exit(void)
 177 {
 178         i2c_del_driver(&max77686_i2c_driver);
 179 }
 180 module_exit(max77686_i2c_exit);
 181
 182 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
 183 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 184 MODULE_LICENSE("GPL");