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
  35 #define I2C_ADDR_RTC    (0x0C >> 1)
  36
  37 static struct mfd_cell max77686_devs[] = {
  38         { .name = "max77686-pmic", },
  39         { .name = "max77686-rtc", },
  40         { .name = "max77686-clk", },
  41 };
  42
  43 static struct regmap_config max77686_regmap_config = {
  44         .reg_bits = 8,
  45         .val_bits = 8,
  46 };
  47
  48 #ifdef CONFIG_OF
  49 static struct of_device_id max77686_pmic_dt_match[] = {
  50         {.compatible = "maxim,max77686", .data = NULL},
  51         {},
  52 };
  53
  54 static 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
  69 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  70                                                                   *dev)
  71 {
  72         return 0;
  73 }
  74 #endif
  75
  76 static 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 = devm_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         if (!max77686->rtc) {
 124                 dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
 125                 return -ENODEV;
 126         }
 127         i2c_set_clientdata(max77686->rtc, max77686);
 128
 129         max77686_irq_init(max77686);
 130
 131         ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
 132                               ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
 133         if (ret < 0) {
 134                 mfd_remove_devices(max77686->dev);
 135                 i2c_unregister_device(max77686->rtc);
 136         }
 137
 138         return ret;
 139 }
 140
 141 static int max77686_i2c_remove(struct i2c_client *i2c)
 142 {
 143         struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
 144
 145         mfd_remove_devices(max77686->dev);
 146         i2c_unregister_device(max77686->rtc);
 147
 148         return 0;
 149 }
 150
 151 static const struct i2c_device_id max77686_i2c_id[] = {
 152         { "max77686", TYPE_MAX77686 },
 153         { }
 154 };
 155 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
 156
 157 static struct i2c_driver max77686_i2c_driver = {
 158         .driver = {
 159                    .name = "max77686",
 160                    .owner = THIS_MODULE,
 161                    .of_match_table = of_match_ptr(max77686_pmic_dt_match),
 162         },
 163         .probe = max77686_i2c_probe,
 164         .remove = max77686_i2c_remove,
 165         .id_table = max77686_i2c_id,
 166 };
 167
 168 static int __init max77686_i2c_init(void)
 169 {
 170         return i2c_add_driver(&max77686_i2c_driver);
 171 }
 172 /* init early so consumer devices can complete system boot */
 173 subsys_initcall(max77686_i2c_init);
 174
 175 static void __exit max77686_i2c_exit(void)
 176 {
 177         i2c_del_driver(&max77686_i2c_driver);
 178 }
 179 module_exit(max77686_i2c_exit);
 180
 181 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
 182 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 183 MODULE_LICENSE("GPL");