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 };
  41
  42 static struct regmap_config max77686_regmap_config = {
  43         .reg_bits = 8,
  44         .val_bits = 8,
  45 };
  46
  47 #ifdef CONFIG_OF
  48 static struct of_device_id max77686_pmic_dt_match[] = {
  49         {.compatible = "maxim,max77686",        .data = 0},
  50         {},
  51 };
  52
  53 static 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
  68 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
  69                                                                   *dev)
  70 {
  71         return 0;
  72 }
  73 #endif
  74
  75 static 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
 136 err_mfd:
 137         mfd_remove_devices(max77686->dev);
 138         i2c_unregister_device(max77686->rtc);
 139 err:
 140         kfree(max77686);
 141         return ret;
 142 }
 143
 144 static 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
 155 static const struct i2c_device_id max77686_i2c_id[] = {
 156         { "max77686", TYPE_MAX77686 },
 157         { }
 158 };
 159 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
 160
 161 static 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
 172 static 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 */
 177 subsys_initcall(max77686_i2c_init);
 178
 179 static void __exit max77686_i2c_exit(void)
 180 {
 181         i2c_del_driver(&max77686_i2c_driver);
 182 }
 183 module_exit(max77686_i2c_exit);
 184
 185 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
 186 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 187 MODULE_LICENSE("GPL");