linux/drivers/mfd/max8998.c
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   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
  37static struct mfd_cell max8998_devs[] = {
  38        {
  39                .name = "max8998-pmic",
  40        }, {
  41                .name = "max8998-rtc",
  42        }, {
  43                .name = "max8998-battery",
  44        },
  45};
  46
  47static struct mfd_cell lp3974_devs[] = {
  48        {
  49                .name = "lp3974-pmic",
  50        }, {
  51                .name = "lp3974-rtc",
  52        },
  53};
  54
  55int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  56{
  57        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  58        int ret;
  59
  60        mutex_lock(&max8998->iolock);
  61        ret = i2c_smbus_read_byte_data(i2c, reg);
  62        mutex_unlock(&max8998->iolock);
  63        if (ret < 0)
  64                return ret;
  65
  66        ret &= 0xff;
  67        *dest = ret;
  68        return 0;
  69}
  70EXPORT_SYMBOL(max8998_read_reg);
  71
  72int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  73{
  74        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  75        int ret;
  76
  77        mutex_lock(&max8998->iolock);
  78        ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  79        mutex_unlock(&max8998->iolock);
  80        if (ret < 0)
  81                return ret;
  82
  83        return 0;
  84}
  85EXPORT_SYMBOL(max8998_bulk_read);
  86
  87int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  88{
  89        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  90        int ret;
  91
  92        mutex_lock(&max8998->iolock);
  93        ret = i2c_smbus_write_byte_data(i2c, reg, value);
  94        mutex_unlock(&max8998->iolock);
  95        return ret;
  96}
  97EXPORT_SYMBOL(max8998_write_reg);
  98
  99int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 100{
 101        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 102        int ret;
 103
 104        mutex_lock(&max8998->iolock);
 105        ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 106        mutex_unlock(&max8998->iolock);
 107        if (ret < 0)
 108                return ret;
 109
 110        return 0;
 111}
 112EXPORT_SYMBOL(max8998_bulk_write);
 113
 114int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 115{
 116        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 117        int ret;
 118
 119        mutex_lock(&max8998->iolock);
 120        ret = i2c_smbus_read_byte_data(i2c, reg);
 121        if (ret >= 0) {
 122                u8 old_val = ret & 0xff;
 123                u8 new_val = (val & mask) | (old_val & (~mask));
 124                ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 125        }
 126        mutex_unlock(&max8998->iolock);
 127        return ret;
 128}
 129EXPORT_SYMBOL(max8998_update_reg);
 130
 131static int max8998_i2c_probe(struct i2c_client *i2c,
 132                            const struct i2c_device_id *id)
 133{
 134        struct max8998_platform_data *pdata = i2c->dev.platform_data;
 135        struct max8998_dev *max8998;
 136        int ret = 0;
 137
 138        max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
 139        if (max8998 == NULL)
 140                return -ENOMEM;
 141
 142        i2c_set_clientdata(i2c, max8998);
 143        max8998->dev = &i2c->dev;
 144        max8998->i2c = i2c;
 145        max8998->irq = i2c->irq;
 146        max8998->type = id->driver_data;
 147        if (pdata) {
 148                max8998->ono = pdata->ono;
 149                max8998->irq_base = pdata->irq_base;
 150                max8998->wakeup = pdata->wakeup;
 151        }
 152        mutex_init(&max8998->iolock);
 153
 154        max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 155        i2c_set_clientdata(max8998->rtc, max8998);
 156
 157        max8998_irq_init(max8998);
 158
 159        pm_runtime_set_active(max8998->dev);
 160
 161        switch (id->driver_data) {
 162        case TYPE_LP3974:
 163                ret = mfd_add_devices(max8998->dev, -1,
 164                                      lp3974_devs, ARRAY_SIZE(lp3974_devs),
 165                                      NULL, 0, NULL);
 166                break;
 167        case TYPE_MAX8998:
 168                ret = mfd_add_devices(max8998->dev, -1,
 169                                      max8998_devs, ARRAY_SIZE(max8998_devs),
 170                                      NULL, 0, NULL);
 171                break;
 172        default:
 173                ret = -EINVAL;
 174        }
 175
 176        if (ret < 0)
 177                goto err;
 178
 179        device_init_wakeup(max8998->dev, max8998->wakeup);
 180
 181        return ret;
 182
 183err:
 184        mfd_remove_devices(max8998->dev);
 185        max8998_irq_exit(max8998);
 186        i2c_unregister_device(max8998->rtc);
 187        kfree(max8998);
 188        return ret;
 189}
 190
 191static int max8998_i2c_remove(struct i2c_client *i2c)
 192{
 193        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 194
 195        mfd_remove_devices(max8998->dev);
 196        max8998_irq_exit(max8998);
 197        i2c_unregister_device(max8998->rtc);
 198        kfree(max8998);
 199
 200        return 0;
 201}
 202
 203static const struct i2c_device_id max8998_i2c_id[] = {
 204        { "max8998", TYPE_MAX8998 },
 205        { "lp3974", TYPE_LP3974},
 206        { }
 207};
 208MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
 209
 210static int max8998_suspend(struct device *dev)
 211{
 212        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 213        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 214
 215        if (device_may_wakeup(dev))
 216                irq_set_irq_wake(max8998->irq, 1);
 217        return 0;
 218}
 219
 220static int max8998_resume(struct device *dev)
 221{
 222        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 223        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 224
 225        if (device_may_wakeup(dev))
 226                irq_set_irq_wake(max8998->irq, 0);
 227        /*
 228         * In LP3974, if IRQ registers are not "read & clear"
 229         * when it's set during sleep, the interrupt becomes
 230         * disabled.
 231         */
 232        return max8998_irq_resume(i2c_get_clientdata(i2c));
 233}
 234
 235struct max8998_reg_dump {
 236        u8      addr;
 237        u8      val;
 238};
 239#define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
 240static struct max8998_reg_dump max8998_dump[] = {
 241        SAVE_ITEM(MAX8998_REG_IRQM1),
 242        SAVE_ITEM(MAX8998_REG_IRQM2),
 243        SAVE_ITEM(MAX8998_REG_IRQM3),
 244        SAVE_ITEM(MAX8998_REG_IRQM4),
 245        SAVE_ITEM(MAX8998_REG_STATUSM1),
 246        SAVE_ITEM(MAX8998_REG_STATUSM2),
 247        SAVE_ITEM(MAX8998_REG_CHGR1),
 248        SAVE_ITEM(MAX8998_REG_CHGR2),
 249        SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 250        SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 251        SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
 252        SAVE_ITEM(MAX8998_REG_ONOFF1),
 253        SAVE_ITEM(MAX8998_REG_ONOFF2),
 254        SAVE_ITEM(MAX8998_REG_ONOFF3),
 255        SAVE_ITEM(MAX8998_REG_ONOFF4),
 256        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
 257        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
 258        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
 259        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
 260        SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
 261        SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
 262        SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
 263        SAVE_ITEM(MAX8998_REG_LDO4),
 264        SAVE_ITEM(MAX8998_REG_LDO5),
 265        SAVE_ITEM(MAX8998_REG_LDO6),
 266        SAVE_ITEM(MAX8998_REG_LDO7),
 267        SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
 268        SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
 269        SAVE_ITEM(MAX8998_REG_LDO12),
 270        SAVE_ITEM(MAX8998_REG_LDO13),
 271        SAVE_ITEM(MAX8998_REG_LDO14),
 272        SAVE_ITEM(MAX8998_REG_LDO15),
 273        SAVE_ITEM(MAX8998_REG_LDO16),
 274        SAVE_ITEM(MAX8998_REG_LDO17),
 275        SAVE_ITEM(MAX8998_REG_BKCHR),
 276        SAVE_ITEM(MAX8998_REG_LBCNFG1),
 277        SAVE_ITEM(MAX8998_REG_LBCNFG2),
 278};
 279/* Save registers before hibernation */
 280static int max8998_freeze(struct device *dev)
 281{
 282        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 283        int i;
 284
 285        for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 286                max8998_read_reg(i2c, max8998_dump[i].addr,
 287                                &max8998_dump[i].val);
 288
 289        return 0;
 290}
 291
 292/* Restore registers after hibernation */
 293static int max8998_restore(struct device *dev)
 294{
 295        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 296        int i;
 297
 298        for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 299                max8998_write_reg(i2c, max8998_dump[i].addr,
 300                                max8998_dump[i].val);
 301
 302        return 0;
 303}
 304
 305static const struct dev_pm_ops max8998_pm = {
 306        .suspend = max8998_suspend,
 307        .resume = max8998_resume,
 308        .freeze = max8998_freeze,
 309        .restore = max8998_restore,
 310};
 311
 312static struct i2c_driver max8998_i2c_driver = {
 313        .driver = {
 314                   .name = "max8998",
 315                   .owner = THIS_MODULE,
 316                   .pm = &max8998_pm,
 317        },
 318        .probe = max8998_i2c_probe,
 319        .remove = max8998_i2c_remove,
 320        .id_table = max8998_i2c_id,
 321};
 322
 323static int __init max8998_i2c_init(void)
 324{
 325        return i2c_add_driver(&max8998_i2c_driver);
 326}
 327/* init early so consumer devices can complete system boot */
 328subsys_initcall(max8998_i2c_init);
 329
 330static void __exit max8998_i2c_exit(void)
 331{
 332        i2c_del_driver(&max8998_i2c_driver);
 333}
 334module_exit(max8998_i2c_exit);
 335
 336MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
 337MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 338MODULE_LICENSE("GPL");
 339
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