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         max77693 = devm_kzalloc(&i2c->dev,
 118                         sizeof(struct max77693_dev), GFP_KERNEL);
 119         if (max77693 == NULL)
 120                 return -ENOMEM;
 121
 122         max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 123         if (IS_ERR(max77693->regmap)) {
 124                 ret = PTR_ERR(max77693->regmap);
 125                 dev_err(max77693->dev,"failed to allocate register map: %d\n",
 126                                 ret);
 127                 goto err_regmap;
 128         }
 129
 130         i2c_set_clientdata(i2c, max77693);
 131         max77693->dev = &i2c->dev;
 132         max77693->i2c = i2c;
 133         max77693->irq = i2c->irq;
 134         max77693->type = id->driver_data;
 135
 136         if (!pdata)
 137                 goto err_regmap;
 138
 139         max77693->wakeup = pdata->wakeup;
 140
 141         if (max77693_read_reg(max77693->regmap,
 142                                 MAX77693_PMIC_REG_PMIC_ID2, &reg_data) < 0) {
 143                 dev_err(max77693->dev, "device not found on this channel\n");
 144                 ret = -ENODEV;
 145                 goto err_regmap;
 146         } else
 147                 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
 148
 149         max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 150         i2c_set_clientdata(max77693->muic, max77693);
 151
 152         max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 153         i2c_set_clientdata(max77693->haptic, max77693);
 154
 155         /*
 156          * Initialize register map for MUIC device because use regmap-muic
 157          * instance of MUIC device when irq of max77693 is initialized
 158          * before call max77693-muic probe() function.
 159          */
 160         max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
 161                                          &max77693_regmap_config);
 162         if (IS_ERR(max77693->regmap_muic)) {
 163                 ret = PTR_ERR(max77693->regmap_muic);
 164                 dev_err(max77693->dev,
 165                         "failed to allocate register map: %d\n", ret);
 166                 goto err_regmap;
 167         }
 168
 169         ret = max77693_irq_init(max77693);
 170         if (ret < 0)
 171                 goto err_irq;
 172
 173         pm_runtime_set_active(max77693->dev);
 174
 175         ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
 176                               ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
 177         if (ret < 0)
 178                 goto err_mfd;
 179
 180         device_init_wakeup(max77693->dev, pdata->wakeup);
 181
 182         return ret;
 183
 184 err_mfd:
 185         max77693_irq_exit(max77693);
 186 err_irq:
 187         i2c_unregister_device(max77693->muic);
 188         i2c_unregister_device(max77693->haptic);
 189 err_regmap:
 190         return ret;
 191 }
 192
 193 static int max77693_i2c_remove(struct i2c_client *i2c)
 194 {
 195         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 196
 197         mfd_remove_devices(max77693->dev);
 198         max77693_irq_exit(max77693);
 199         i2c_unregister_device(max77693->muic);
 200         i2c_unregister_device(max77693->haptic);
 201
 202         return 0;
 203 }
 204
 205 static const struct i2c_device_id max77693_i2c_id[] = {
 206         { "max77693", TYPE_MAX77693 },
 207         { }
 208 };
 209 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 210
 211 static int max77693_suspend(struct device *dev)
 212 {
 213         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 214         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 215
 216         if (device_may_wakeup(dev))
 217                 irq_set_irq_wake(max77693->irq, 1);
 218         return 0;
 219 }
 220
 221 static int max77693_resume(struct device *dev)
 222 {
 223         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 224         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 225
 226         if (device_may_wakeup(dev))
 227                 irq_set_irq_wake(max77693->irq, 0);
 228         return max77693_irq_resume(max77693);
 229 }
 230
 231 static const struct dev_pm_ops max77693_pm = {
 232         .suspend = max77693_suspend,
 233         .resume = max77693_resume,
 234 };
 235
 236 static struct i2c_driver max77693_i2c_driver = {
 237         .driver = {
 238                    .name = "max77693",
 239                    .owner = THIS_MODULE,
 240                    .pm = &max77693_pm,
 241         },
 242         .probe = max77693_i2c_probe,
 243         .remove = max77693_i2c_remove,
 244         .id_table = max77693_i2c_id,
 245 };
 246
 247 static int __init max77693_i2c_init(void)
 248 {
 249         return i2c_add_driver(&max77693_i2c_driver);
 250 }
 251 /* init early so consumer devices can complete system boot */
 252 subsys_initcall(max77693_i2c_init);
 253
 254 static void __exit max77693_i2c_exit(void)
 255 {
 256         i2c_del_driver(&max77693_i2c_driver);
 257 }
 258 module_exit(max77693_i2c_exit);
 259
 260 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
 261 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
 262 MODULE_LICENSE("GPL");