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/of.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/mutex.h>
  34 #include <linux/mfd/core.h>
  35 #include <linux/mfd/max77693.h>
  36 #include <linux/mfd/max77693-private.h>
  37 #include <linux/regulator/machine.h>
  38 #include <linux/regmap.h>
  39
  40 #define I2C_ADDR_PMIC   (0xCC >> 1)     /* Charger, Flash LED */
  41 #define I2C_ADDR_MUIC   (0x4A >> 1)
  42 #define I2C_ADDR_HAPTIC (0x90 >> 1)
  43
  44 static const struct mfd_cell max77693_devs[] = {
  45         { .name = "max77693-pmic", },
  46         { .name = "max77693-charger", },
  47         { .name = "max77693-flash", },
  48         { .name = "max77693-muic", },
  49         { .name = "max77693-haptic", },
  50 };
  51
  52 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
  53 {
  54         unsigned int val;
  55         int ret;
  56
  57         ret = regmap_read(map, reg, &val);
  58         *dest = val;
  59
  60         return ret;
  61 }
  62 EXPORT_SYMBOL_GPL(max77693_read_reg);
  63
  64 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
  65 {
  66         int ret;
  67
  68         ret = regmap_bulk_read(map, reg, buf, count);
  69
  70         return ret;
  71 }
  72 EXPORT_SYMBOL_GPL(max77693_bulk_read);
  73
  74 int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
  75 {
  76         int ret;
  77
  78         ret = regmap_write(map, reg, value);
  79
  80         return ret;
  81 }
  82 EXPORT_SYMBOL_GPL(max77693_write_reg);
  83
  84 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
  85 {
  86         int ret;
  87
  88         ret = regmap_bulk_write(map, reg, buf, count);
  89
  90         return ret;
  91 }
  92 EXPORT_SYMBOL_GPL(max77693_bulk_write);
  93
  94 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
  95 {
  96         int ret;
  97
  98         ret = regmap_update_bits(map, reg, mask, val);
  99
 100         return ret;
 101 }
 102 EXPORT_SYMBOL_GPL(max77693_update_reg);
 103
 104 static const struct regmap_config max77693_regmap_config = {
 105         .reg_bits = 8,
 106         .val_bits = 8,
 107         .max_register = MAX77693_PMIC_REG_END,
 108 };
 109
 110 static const struct regmap_config max77693_regmap_muic_config = {
 111         .reg_bits = 8,
 112         .val_bits = 8,
 113         .max_register = MAX77693_MUIC_REG_END,
 114 };
 115
 116 static int max77693_i2c_probe(struct i2c_client *i2c,
 117                               const struct i2c_device_id *id)
 118 {
 119         struct max77693_dev *max77693;
 120         u8 reg_data;
 121         int ret = 0;
 122
 123         max77693 = devm_kzalloc(&i2c->dev,
 124                         sizeof(struct max77693_dev), GFP_KERNEL);
 125         if (max77693 == NULL)
 126                 return -ENOMEM;
 127
 128         i2c_set_clientdata(i2c, max77693);
 129         max77693->dev = &i2c->dev;
 130         max77693->i2c = i2c;
 131         max77693->irq = i2c->irq;
 132         max77693->type = id->driver_data;
 133
 134         max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 135         if (IS_ERR(max77693->regmap)) {
 136                 ret = PTR_ERR(max77693->regmap);
 137                 dev_err(max77693->dev, "failed to allocate register map: %d\n",
 138                                 ret);
 139                 return ret;
 140         }
 141
 142         ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
 143                                 &reg_data);
 144         if (ret < 0) {
 145                 dev_err(max77693->dev, "device not found on this channel\n");
 146                 return ret;
 147         } else
 148                 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
 149
 150         max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 151         i2c_set_clientdata(max77693->muic, max77693);
 152
 153         max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 154         i2c_set_clientdata(max77693->haptic, max77693);
 155
 156         /*
 157          * Initialize register map for MUIC device because use regmap-muic
 158          * instance of MUIC device when irq of max77693 is initialized
 159          * before call max77693-muic probe() function.
 160          */
 161         max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
 162                                          &max77693_regmap_muic_config);
 163         if (IS_ERR(max77693->regmap_muic)) {
 164                 ret = PTR_ERR(max77693->regmap_muic);
 165                 dev_err(max77693->dev,
 166                         "failed to allocate register map: %d\n", ret);
 167                 goto err_regmap_muic;
 168         }
 169
 170         ret = max77693_irq_init(max77693);
 171         if (ret < 0)
 172                 goto err_irq;
 173
 174         pm_runtime_set_active(max77693->dev);
 175
 176         ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
 177                               ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
 178         if (ret < 0)
 179                 goto err_mfd;
 180
 181         return ret;
 182
 183 err_mfd:
 184         max77693_irq_exit(max77693);
 185 err_irq:
 186 err_regmap_muic:
 187         i2c_unregister_device(max77693->muic);
 188         i2c_unregister_device(max77693->haptic);
 189         return ret;
 190 }
 191
 192 static int max77693_i2c_remove(struct i2c_client *i2c)
 193 {
 194         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 195
 196         mfd_remove_devices(max77693->dev);
 197         max77693_irq_exit(max77693);
 198         i2c_unregister_device(max77693->muic);
 199         i2c_unregister_device(max77693->haptic);
 200
 201         return 0;
 202 }
 203
 204 static const struct i2c_device_id max77693_i2c_id[] = {
 205         { "max77693", TYPE_MAX77693 },
 206         { }
 207 };
 208 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 209
 210 static int max77693_suspend(struct device *dev)
 211 {
 212         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 213         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 214
 215         if (device_may_wakeup(dev))
 216                 irq_set_irq_wake(max77693->irq, 1);
 217         return 0;
 218 }
 219
 220 static int max77693_resume(struct device *dev)
 221 {
 222         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 223         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 224
 225         if (device_may_wakeup(dev))
 226                 irq_set_irq_wake(max77693->irq, 0);
 227         return max77693_irq_resume(max77693);
 228 }
 229
 230 static const struct dev_pm_ops max77693_pm = {
 231         .suspend = max77693_suspend,
 232         .resume = max77693_resume,
 233 };
 234
 235 #ifdef CONFIG_OF
 236 static struct of_device_id max77693_dt_match[] = {
 237         { .compatible = "maxim,max77693" },
 238         {},
 239 };
 240 #endif
 241
 242 static struct i2c_driver max77693_i2c_driver = {
 243         .driver = {
 244                    .name = "max77693",
 245                    .owner = THIS_MODULE,
 246                    .pm = &max77693_pm,
 247                    .of_match_table = of_match_ptr(max77693_dt_match),
 248         },
 249         .probe = max77693_i2c_probe,
 250         .remove = max77693_i2c_remove,
 251         .id_table = max77693_i2c_id,
 252 };
 253
 254 static int __init max77693_i2c_init(void)
 255 {
 256         return i2c_add_driver(&max77693_i2c_driver);
 257 }
 258 /* init early so consumer devices can complete system boot */
 259 subsys_initcall(max77693_i2c_init);
 260
 261 static void __exit max77693_i2c_exit(void)
 262 {
 263         i2c_del_driver(&max77693_i2c_driver);
 264 }
 265 module_exit(max77693_i2c_exit);
 266
 267 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
 268 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
 269 MODULE_LICENSE("GPL");