drivers/mfd/max8998.c

   1 /*
   2  * max8998.c - mfd core driver for the Maxim 8998
   3  *
   4  *  Copyright (C) 2009-2010 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *  Marek Szyprowski <m.szyprowski@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
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/i2c.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/mutex.h>
  31 #include <linux/mfd/core.h>
  32 #include <linux/mfd/max8998.h>
  33 #include <linux/mfd/max8998-private.h>
  34
  35 #define RTC_I2C_ADDR            (0x0c >> 1)
  36
  37 static struct mfd_cell max8998_devs[] = {
  38         {
  39                 .name = "max8998-pmic",
  40         }, {
  41                 .name = "max8998-rtc",
  42         },
  43 };
  44
  45 static struct mfd_cell lp3974_devs[] = {
  46         {
  47                 .name = "lp3974-pmic",
  48         }, {
  49                 .name = "lp3974-rtc",
  50         },
  51 };
  52
  53 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  54 {
  55         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  56         int ret;
  57
  58         mutex_lock(&max8998->iolock);
  59         ret = i2c_smbus_read_byte_data(i2c, reg);
  60         mutex_unlock(&max8998->iolock);
  61         if (ret < 0)
  62                 return ret;
  63
  64         ret &= 0xff;
  65         *dest = ret;
  66         return 0;
  67 }
  68 EXPORT_SYMBOL(max8998_read_reg);
  69
  70 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  71 {
  72         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  73         int ret;
  74
  75         mutex_lock(&max8998->iolock);
  76         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  77         mutex_unlock(&max8998->iolock);
  78         if (ret < 0)
  79                 return ret;
  80
  81         return 0;
  82 }
  83 EXPORT_SYMBOL(max8998_bulk_read);
  84
  85 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  86 {
  87         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  88         int ret;
  89
  90         mutex_lock(&max8998->iolock);
  91         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  92         mutex_unlock(&max8998->iolock);
  93         return ret;
  94 }
  95 EXPORT_SYMBOL(max8998_write_reg);
  96
  97 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  98 {
  99         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 100         int ret;
 101
 102         mutex_lock(&max8998->iolock);
 103         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 104         mutex_unlock(&max8998->iolock);
 105         if (ret < 0)
 106                 return ret;
 107
 108         return 0;
 109 }
 110 EXPORT_SYMBOL(max8998_bulk_write);
 111
 112 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 113 {
 114         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 115         int ret;
 116
 117         mutex_lock(&max8998->iolock);
 118         ret = i2c_smbus_read_byte_data(i2c, reg);
 119         if (ret >= 0) {
 120                 u8 old_val = ret & 0xff;
 121                 u8 new_val = (val & mask) | (old_val & (~mask));
 122                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 123         }
 124         mutex_unlock(&max8998->iolock);
 125         return ret;
 126 }
 127 EXPORT_SYMBOL(max8998_update_reg);
 128
 129 static int max8998_i2c_probe(struct i2c_client *i2c,
 130                             const struct i2c_device_id *id)
 131 {
 132         struct max8998_platform_data *pdata = i2c->dev.platform_data;
 133         struct max8998_dev *max8998;
 134         int ret = 0;
 135
 136         max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
 137         if (max8998 == NULL)
 138                 return -ENOMEM;
 139
 140         i2c_set_clientdata(i2c, max8998);
 141         max8998->dev = &i2c->dev;
 142         max8998->i2c = i2c;
 143         max8998->irq = i2c->irq;
 144         max8998->type = id->driver_data;
 145         if (pdata) {
 146                 max8998->ono = pdata->ono;
 147                 max8998->irq_base = pdata->irq_base;
 148                 max8998->wakeup = pdata->wakeup;
 149         }
 150         mutex_init(&max8998->iolock);
 151
 152         max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 153         i2c_set_clientdata(max8998->rtc, max8998);
 154
 155         max8998_irq_init(max8998);
 156
 157         pm_runtime_set_active(max8998->dev);
 158
 159         switch (id->driver_data) {
 160         case TYPE_LP3974:
 161                 ret = mfd_add_devices(max8998->dev, -1,
 162                                 lp3974_devs, ARRAY_SIZE(lp3974_devs),
 163                                 NULL, 0);
 164                 break;
 165         case TYPE_MAX8998:
 166                 ret = mfd_add_devices(max8998->dev, -1,
 167                                 max8998_devs, ARRAY_SIZE(max8998_devs),
 168                                 NULL, 0);
 169                 break;
 170         default:
 171                 ret = -EINVAL;
 172         }
 173
 174         if (ret < 0)
 175                 goto err;
 176
 177         return ret;
 178
 179 err:
 180         mfd_remove_devices(max8998->dev);
 181         max8998_irq_exit(max8998);
 182         i2c_unregister_device(max8998->rtc);
 183         kfree(max8998);
 184         return ret;
 185 }
 186
 187 static int max8998_i2c_remove(struct i2c_client *i2c)
 188 {
 189         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 190
 191         mfd_remove_devices(max8998->dev);
 192         max8998_irq_exit(max8998);
 193         i2c_unregister_device(max8998->rtc);
 194         kfree(max8998);
 195
 196         return 0;
 197 }
 198
 199 static const struct i2c_device_id max8998_i2c_id[] = {
 200         { "max8998", TYPE_MAX8998 },
 201         { "lp3974", TYPE_LP3974},
 202         { }
 203 };
 204 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
 205
 206 static int max8998_suspend(struct device *dev)
 207 {
 208         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 209         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 210
 211         if (max8998->wakeup)
 212                 set_irq_wake(max8998->irq, 1);
 213         return 0;
 214 }
 215
 216 static int max8998_resume(struct device *dev)
 217 {
 218         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 219         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 220
 221         if (max8998->wakeup)
 222                 set_irq_wake(max8998->irq, 0);
 223         /*
 224          * In LP3974, if IRQ registers are not "read & clear"
 225          * when it's set during sleep, the interrupt becomes
 226          * disabled.
 227          */
 228         return max8998_irq_resume(i2c_get_clientdata(i2c));
 229 }
 230
 231 struct max8998_reg_dump {
 232         u8      addr;
 233         u8      val;
 234 };
 235 #define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
 236 struct max8998_reg_dump max8998_dump[] = {
 237         SAVE_ITEM(MAX8998_REG_IRQM1),
 238         SAVE_ITEM(MAX8998_REG_IRQM2),
 239         SAVE_ITEM(MAX8998_REG_IRQM3),
 240         SAVE_ITEM(MAX8998_REG_IRQM4),
 241         SAVE_ITEM(MAX8998_REG_STATUSM1),
 242         SAVE_ITEM(MAX8998_REG_STATUSM2),
 243         SAVE_ITEM(MAX8998_REG_CHGR1),
 244         SAVE_ITEM(MAX8998_REG_CHGR2),
 245         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 246         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 247         SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
 248         SAVE_ITEM(MAX8998_REG_ONOFF1),
 249         SAVE_ITEM(MAX8998_REG_ONOFF2),
 250         SAVE_ITEM(MAX8998_REG_ONOFF3),
 251         SAVE_ITEM(MAX8998_REG_ONOFF4),
 252         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
 253         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
 254         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
 255         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
 256         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
 257         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
 258         SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
 259         SAVE_ITEM(MAX8998_REG_LDO4),
 260         SAVE_ITEM(MAX8998_REG_LDO5),
 261         SAVE_ITEM(MAX8998_REG_LDO6),
 262         SAVE_ITEM(MAX8998_REG_LDO7),
 263         SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
 264         SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
 265         SAVE_ITEM(MAX8998_REG_LDO12),
 266         SAVE_ITEM(MAX8998_REG_LDO13),
 267         SAVE_ITEM(MAX8998_REG_LDO14),
 268         SAVE_ITEM(MAX8998_REG_LDO15),
 269         SAVE_ITEM(MAX8998_REG_LDO16),
 270         SAVE_ITEM(MAX8998_REG_LDO17),
 271         SAVE_ITEM(MAX8998_REG_BKCHR),
 272         SAVE_ITEM(MAX8998_REG_LBCNFG1),
 273         SAVE_ITEM(MAX8998_REG_LBCNFG2),
 274 };
 275 /* Save registers before hibernation */
 276 static int max8998_freeze(struct device *dev)
 277 {
 278         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 279         int i;
 280
 281         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 282                 max8998_read_reg(i2c, max8998_dump[i].addr,
 283                                 &max8998_dump[i].val);
 284
 285         return 0;
 286 }
 287
 288 /* Restore registers after hibernation */
 289 static int max8998_restore(struct device *dev)
 290 {
 291         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 292         int i;
 293
 294         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 295                 max8998_write_reg(i2c, max8998_dump[i].addr,
 296                                 max8998_dump[i].val);
 297
 298         return 0;
 299 }
 300
 301 const struct dev_pm_ops max8998_pm = {
 302         .suspend = max8998_suspend,
 303         .resume = max8998_resume,
 304         .freeze = max8998_freeze,
 305         .restore = max8998_restore,
 306 };
 307
 308 static struct i2c_driver max8998_i2c_driver = {
 309         .driver = {
 310                    .name = "max8998",
 311                    .owner = THIS_MODULE,
 312                    .pm = &max8998_pm,
 313         },
 314         .probe = max8998_i2c_probe,
 315         .remove = max8998_i2c_remove,
 316         .id_table = max8998_i2c_id,
 317 };
 318
 319 static int __init max8998_i2c_init(void)
 320 {
 321         return i2c_add_driver(&max8998_i2c_driver);
 322 }
 323 /* init early so consumer devices can complete system boot */
 324 subsys_initcall(max8998_i2c_init);
 325
 326 static void __exit max8998_i2c_exit(void)
 327 {
 328         i2c_del_driver(&max8998_i2c_driver);
 329 }
 330 module_exit(max8998_i2c_exit);
 331
 332 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
 333 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 334 MODULE_LICENSE("GPL");