drivers/mfd/max77693.c

   1 /*
   2  * max77693.c - mfd core driver for the MAX 77693
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * SangYoung Son <hello.son@smasung.com>
   6  *
   7  * This program is not provided / owned by Maxim Integrated Products.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * This driver is based on max8997.c
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/i2c.h>
  29 #include <linux/err.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/mutex.h>
  33 #include <linux/mfd/core.h>
  34 #include <linux/mfd/max77693.h>
  35 #include <linux/mfd/max77693-private.h>
  36 #include <linux/regulator/machine.h>
  37 #include <linux/regmap.h>
  38
  39 #define I2C_ADDR_PMIC   (0xCC >> 1)     /* Charger, Flash LED */
  40 #define I2C_ADDR_MUIC   (0x4A >> 1)
  41 #define I2C_ADDR_HAPTIC (0x90 >> 1)
  42
  43 static struct mfd_cell max77693_devs[] = {
  44         { .name = "max77693-pmic", },
  45         { .name = "max77693-charger", },
  46         { .name = "max77693-flash", },
  47         { .name = "max77693-muic", },
  48         { .name = "max77693-haptic", },
  49 };
  50
  51 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
  52 {
  53         unsigned int val;
  54         int ret;
  55
  56         ret = regmap_read(map, reg, &val);
  57         *dest = val;
  58
  59         return ret;
  60 }
  61 EXPORT_SYMBOL_GPL(max77693_read_reg);
  62
  63 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
  64 {
  65         int ret;
  66
  67         ret = regmap_bulk_read(map, reg, buf, count);
  68
  69         return ret;
  70 }
  71 EXPORT_SYMBOL_GPL(max77693_bulk_read);
  72
  73 int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
  74 {
  75         int ret;
  76
  77         ret = regmap_write(map, reg, value);
  78
  79         return ret;
  80 }
  81 EXPORT_SYMBOL_GPL(max77693_write_reg);
  82
  83 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
  84 {
  85         int ret;
  86
  87         ret = regmap_bulk_write(map, reg, buf, count);
  88
  89         return ret;
  90 }
  91 EXPORT_SYMBOL_GPL(max77693_bulk_write);
  92
  93 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
  94 {
  95         int ret;
  96
  97         ret = regmap_update_bits(map, reg, mask, val);
  98
  99         return ret;
 100 }
 101 EXPORT_SYMBOL_GPL(max77693_update_reg);
 102
 103 static const struct regmap_config max77693_regmap_config = {
 104         .reg_bits = 8,
 105         .val_bits = 8,
 106         .max_register = MAX77693_PMIC_REG_END,
 107 };
 108
 109 static int max77693_i2c_probe(struct i2c_client *i2c,
 110                               const struct i2c_device_id *id)
 111 {
 112         struct max77693_dev *max77693;
 113         struct max77693_platform_data *pdata = i2c->dev.platform_data;
 114         u8 reg_data;
 115         int ret = 0;
 116
 117         if (!pdata) {
 118                 dev_err(&i2c->dev, "No platform data found.\n");
 119                 return -EINVAL;
 120         }
 121
 122         max77693 = devm_kzalloc(&i2c->dev,
 123                         sizeof(struct max77693_dev), GFP_KERNEL);
 124         if (max77693 == NULL)
 125                 return -ENOMEM;
 126
 127         i2c_set_clientdata(i2c, max77693);
 128         max77693->dev = &i2c->dev;
 129         max77693->i2c = i2c;
 130         max77693->irq = i2c->irq;
 131         max77693->type = id->driver_data;
 132
 133         max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 134         if (IS_ERR(max77693->regmap)) {
 135                 ret = PTR_ERR(max77693->regmap);
 136                 dev_err(max77693->dev, "failed to allocate register map: %d\n",
 137                                 ret);
 138                 return ret;
 139         }
 140
 141         max77693->wakeup = pdata->wakeup;
 142
 143         ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
 144                                 &reg_data);
 145         if (ret < 0) {
 146                 dev_err(max77693->dev, "device not found on this channel\n");
 147                 return ret;
 148         } else
 149                 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
 150
 151         max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 152         if (!max77693->muic) {
 153                 dev_err(max77693->dev, "Failed to allocate I2C device for MUIC\n");
 154                 return -ENODEV;
 155         }
 156         i2c_set_clientdata(max77693->muic, max77693);
 157
 158         max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 159         if (!max77693->haptic) {
 160                 dev_err(max77693->dev, "Failed to allocate I2C device for Haptic\n");
 161                 ret = -ENODEV;
 162                 goto err_i2c_haptic;
 163         }
 164         i2c_set_clientdata(max77693->haptic, max77693);
 165
 166         /*
 167          * Initialize register map for MUIC device because use regmap-muic
 168          * instance of MUIC device when irq of max77693 is initialized
 169          * before call max77693-muic probe() function.
 170          */
 171         max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
 172                                          &max77693_regmap_config);
 173         if (IS_ERR(max77693->regmap_muic)) {
 174                 ret = PTR_ERR(max77693->regmap_muic);
 175                 dev_err(max77693->dev,
 176                         "failed to allocate register map: %d\n", ret);
 177                 goto err_regmap_muic;
 178         }
 179
 180         ret = max77693_irq_init(max77693);
 181         if (ret < 0)
 182                 goto err_irq;
 183
 184         pm_runtime_set_active(max77693->dev);
 185
 186         ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
 187                               ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
 188         if (ret < 0)
 189                 goto err_mfd;
 190
 191         device_init_wakeup(max77693->dev, pdata->wakeup);
 192
 193         return ret;
 194
 195 err_mfd:
 196         max77693_irq_exit(max77693);
 197 err_irq:
 198 err_regmap_muic:
 199         i2c_unregister_device(max77693->haptic);
 200 err_i2c_haptic:
 201         i2c_unregister_device(max77693->muic);
 202         return ret;
 203 }
 204
 205 static int max77693_i2c_remove(struct i2c_client *i2c)
 206 {
 207         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 208
 209         mfd_remove_devices(max77693->dev);
 210         max77693_irq_exit(max77693);
 211         i2c_unregister_device(max77693->muic);
 212         i2c_unregister_device(max77693->haptic);
 213
 214         return 0;
 215 }
 216
 217 static const struct i2c_device_id max77693_i2c_id[] = {
 218         { "max77693", TYPE_MAX77693 },
 219         { }
 220 };
 221 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 222
 223 static int max77693_suspend(struct device *dev)
 224 {
 225         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 226         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 227
 228         if (device_may_wakeup(dev))
 229                 irq_set_irq_wake(max77693->irq, 1);
 230         return 0;
 231 }
 232
 233 static int max77693_resume(struct device *dev)
 234 {
 235         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 236         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 237
 238         if (device_may_wakeup(dev))
 239                 irq_set_irq_wake(max77693->irq, 0);
 240         return max77693_irq_resume(max77693);
 241 }
 242
 243 static const struct dev_pm_ops max77693_pm = {
 244         .suspend = max77693_suspend,
 245         .resume = max77693_resume,
 246 };
 247
 248 static struct i2c_driver max77693_i2c_driver = {
 249         .driver = {
 250                    .name = "max77693",
 251                    .owner = THIS_MODULE,
 252                    .pm = &max77693_pm,
 253         },
 254         .probe = max77693_i2c_probe,
 255         .remove = max77693_i2c_remove,
 256         .id_table = max77693_i2c_id,
 257 };
 258
 259 static int __init max77693_i2c_init(void)
 260 {
 261         return i2c_add_driver(&max77693_i2c_driver);
 262 }
 263 /* init early so consumer devices can complete system boot */
 264 subsys_initcall(max77693_i2c_init);
 265
 266 static void __exit max77693_i2c_exit(void)
 267 {
 268         i2c_del_driver(&max77693_i2c_driver);
 269 }
 270 module_exit(max77693_i2c_exit);
 271
 272 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
 273 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
 274 MODULE_LICENSE("GPL");