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/err.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/i2c.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/of.h>
  29 #include <linux/of_irq.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/mutex.h>
  32 #include <linux/mfd/core.h>
  33 #include <linux/mfd/max8998.h>
  34 #include <linux/mfd/max8998-private.h>
  35
  36 #define RTC_I2C_ADDR            (0x0c >> 1)
  37
  38 static const struct mfd_cell max8998_devs[] = {
  39         {
  40                 .name = "max8998-pmic",
  41         }, {
  42                 .name = "max8998-rtc",
  43         }, {
  44                 .name = "max8998-battery",
  45         },
  46 };
  47
  48 static const struct mfd_cell lp3974_devs[] = {
  49         {
  50                 .name = "lp3974-pmic",
  51         }, {
  52                 .name = "lp3974-rtc",
  53         },
  54 };
  55
  56 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  57 {
  58         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  59         int ret;
  60
  61         mutex_lock(&max8998->iolock);
  62         ret = i2c_smbus_read_byte_data(i2c, reg);
  63         mutex_unlock(&max8998->iolock);
  64         if (ret < 0)
  65                 return ret;
  66
  67         ret &= 0xff;
  68         *dest = ret;
  69         return 0;
  70 }
  71 EXPORT_SYMBOL(max8998_read_reg);
  72
  73 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  74 {
  75         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  76         int ret;
  77
  78         mutex_lock(&max8998->iolock);
  79         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  80         mutex_unlock(&max8998->iolock);
  81         if (ret < 0)
  82                 return ret;
  83
  84         return 0;
  85 }
  86 EXPORT_SYMBOL(max8998_bulk_read);
  87
  88 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  89 {
  90         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  91         int ret;
  92
  93         mutex_lock(&max8998->iolock);
  94         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  95         mutex_unlock(&max8998->iolock);
  96         return ret;
  97 }
  98 EXPORT_SYMBOL(max8998_write_reg);
  99
 100 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 101 {
 102         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 103         int ret;
 104
 105         mutex_lock(&max8998->iolock);
 106         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
 107         mutex_unlock(&max8998->iolock);
 108         if (ret < 0)
 109                 return ret;
 110
 111         return 0;
 112 }
 113 EXPORT_SYMBOL(max8998_bulk_write);
 114
 115 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 116 {
 117         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 118         int ret;
 119
 120         mutex_lock(&max8998->iolock);
 121         ret = i2c_smbus_read_byte_data(i2c, reg);
 122         if (ret >= 0) {
 123                 u8 old_val = ret & 0xff;
 124                 u8 new_val = (val & mask) | (old_val & (~mask));
 125                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 126         }
 127         mutex_unlock(&max8998->iolock);
 128         return ret;
 129 }
 130 EXPORT_SYMBOL(max8998_update_reg);
 131
 132 #ifdef CONFIG_OF
 133 static const struct of_device_id max8998_dt_match[] = {
 134         { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
 135         { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
 136         { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
 137         {},
 138 };
 139 #endif
 140
 141 /*
 142  * Only the common platform data elements for max8998 are parsed here from the
 143  * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
 144  * to parse their own platform data elements from device tree.
 145  *
 146  * The max8998 platform data structure is instantiated here and the drivers for
 147  * the sub-modules need not instantiate another instance while parsing their
 148  * platform data.
 149  */
 150 static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
 151                                                         struct device *dev)
 152 {
 153         struct max8998_platform_data *pd;
 154
 155         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 156         if (!pd)
 157                 return ERR_PTR(-ENOMEM);
 158
 159         pd->ono = irq_of_parse_and_map(dev->of_node, 1);
 160
 161         /*
 162          * ToDo: the 'wakeup' member in the platform data is more of a linux
 163          * specfic information. Hence, there is no binding for that yet and
 164          * not parsed here.
 165          */
 166         return pd;
 167 }
 168
 169 static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
 170                                                 const struct i2c_device_id *id)
 171 {
 172         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 173                 const struct of_device_id *match;
 174                 match = of_match_node(max8998_dt_match, i2c->dev.of_node);
 175                 return (unsigned long)match->data;
 176         }
 177
 178         return id->driver_data;
 179 }
 180
 181 static int max8998_i2c_probe(struct i2c_client *i2c,
 182                             const struct i2c_device_id *id)
 183 {
 184         struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
 185         struct max8998_dev *max8998;
 186         int ret = 0;
 187
 188         max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
 189                                 GFP_KERNEL);
 190         if (max8998 == NULL)
 191                 return -ENOMEM;
 192
 193         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 194                 pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
 195                 if (IS_ERR(pdata)) {
 196                         ret = PTR_ERR(pdata);
 197                         goto err;
 198                 }
 199         }
 200
 201         i2c_set_clientdata(i2c, max8998);
 202         max8998->dev = &i2c->dev;
 203         max8998->i2c = i2c;
 204         max8998->irq = i2c->irq;
 205         max8998->type = max8998_i2c_get_driver_data(i2c, id);
 206         max8998->pdata = pdata;
 207         if (pdata) {
 208                 max8998->ono = pdata->ono;
 209                 max8998->irq_base = pdata->irq_base;
 210                 max8998->wakeup = pdata->wakeup;
 211         }
 212         mutex_init(&max8998->iolock);
 213
 214         max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 215         if (!max8998->rtc) {
 216                 dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
 217                 return -ENODEV;
 218         }
 219         i2c_set_clientdata(max8998->rtc, max8998);
 220
 221         max8998_irq_init(max8998);
 222
 223         pm_runtime_set_active(max8998->dev);
 224
 225         switch (max8998->type) {
 226         case TYPE_LP3974:
 227                 ret = mfd_add_devices(max8998->dev, -1,
 228                                       lp3974_devs, ARRAY_SIZE(lp3974_devs),
 229                                       NULL, 0, NULL);
 230                 break;
 231         case TYPE_MAX8998:
 232                 ret = mfd_add_devices(max8998->dev, -1,
 233                                       max8998_devs, ARRAY_SIZE(max8998_devs),
 234                                       NULL, 0, NULL);
 235                 break;
 236         default:
 237                 ret = -EINVAL;
 238         }
 239
 240         if (ret < 0)
 241                 goto err;
 242
 243         device_init_wakeup(max8998->dev, max8998->wakeup);
 244
 245         return ret;
 246
 247 err:
 248         mfd_remove_devices(max8998->dev);
 249         max8998_irq_exit(max8998);
 250         i2c_unregister_device(max8998->rtc);
 251         return ret;
 252 }
 253
 254 static const struct i2c_device_id max8998_i2c_id[] = {
 255         { "max8998", TYPE_MAX8998 },
 256         { "lp3974", TYPE_LP3974},
 257         { }
 258 };
 259
 260 static int max8998_suspend(struct device *dev)
 261 {
 262         struct i2c_client *i2c = to_i2c_client(dev);
 263         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 264
 265         if (device_may_wakeup(dev))
 266                 irq_set_irq_wake(max8998->irq, 1);
 267         return 0;
 268 }
 269
 270 static int max8998_resume(struct device *dev)
 271 {
 272         struct i2c_client *i2c = to_i2c_client(dev);
 273         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 274
 275         if (device_may_wakeup(dev))
 276                 irq_set_irq_wake(max8998->irq, 0);
 277         /*
 278          * In LP3974, if IRQ registers are not "read & clear"
 279          * when it's set during sleep, the interrupt becomes
 280          * disabled.
 281          */
 282         return max8998_irq_resume(i2c_get_clientdata(i2c));
 283 }
 284
 285 struct max8998_reg_dump {
 286         u8      addr;
 287         u8      val;
 288 };
 289 #define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
 290 static struct max8998_reg_dump max8998_dump[] = {
 291         SAVE_ITEM(MAX8998_REG_IRQM1),
 292         SAVE_ITEM(MAX8998_REG_IRQM2),
 293         SAVE_ITEM(MAX8998_REG_IRQM3),
 294         SAVE_ITEM(MAX8998_REG_IRQM4),
 295         SAVE_ITEM(MAX8998_REG_STATUSM1),
 296         SAVE_ITEM(MAX8998_REG_STATUSM2),
 297         SAVE_ITEM(MAX8998_REG_CHGR1),
 298         SAVE_ITEM(MAX8998_REG_CHGR2),
 299         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 300         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 301         SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
 302         SAVE_ITEM(MAX8998_REG_ONOFF1),
 303         SAVE_ITEM(MAX8998_REG_ONOFF2),
 304         SAVE_ITEM(MAX8998_REG_ONOFF3),
 305         SAVE_ITEM(MAX8998_REG_ONOFF4),
 306         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
 307         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
 308         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
 309         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
 310         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
 311         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
 312         SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
 313         SAVE_ITEM(MAX8998_REG_LDO4),
 314         SAVE_ITEM(MAX8998_REG_LDO5),
 315         SAVE_ITEM(MAX8998_REG_LDO6),
 316         SAVE_ITEM(MAX8998_REG_LDO7),
 317         SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
 318         SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
 319         SAVE_ITEM(MAX8998_REG_LDO12),
 320         SAVE_ITEM(MAX8998_REG_LDO13),
 321         SAVE_ITEM(MAX8998_REG_LDO14),
 322         SAVE_ITEM(MAX8998_REG_LDO15),
 323         SAVE_ITEM(MAX8998_REG_LDO16),
 324         SAVE_ITEM(MAX8998_REG_LDO17),
 325         SAVE_ITEM(MAX8998_REG_BKCHR),
 326         SAVE_ITEM(MAX8998_REG_LBCNFG1),
 327         SAVE_ITEM(MAX8998_REG_LBCNFG2),
 328 };
 329 /* Save registers before hibernation */
 330 static int max8998_freeze(struct device *dev)
 331 {
 332         struct i2c_client *i2c = to_i2c_client(dev);
 333         int i;
 334
 335         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 336                 max8998_read_reg(i2c, max8998_dump[i].addr,
 337                                 &max8998_dump[i].val);
 338
 339         return 0;
 340 }
 341
 342 /* Restore registers after hibernation */
 343 static int max8998_restore(struct device *dev)
 344 {
 345         struct i2c_client *i2c = to_i2c_client(dev);
 346         int i;
 347
 348         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 349                 max8998_write_reg(i2c, max8998_dump[i].addr,
 350                                 max8998_dump[i].val);
 351
 352         return 0;
 353 }
 354
 355 static const struct dev_pm_ops max8998_pm = {
 356         .suspend = max8998_suspend,
 357         .resume = max8998_resume,
 358         .freeze = max8998_freeze,
 359         .restore = max8998_restore,
 360 };
 361
 362 static struct i2c_driver max8998_i2c_driver = {
 363         .driver = {
 364                    .name = "max8998",
 365                    .pm = &max8998_pm,
 366                    .suppress_bind_attrs = true,
 367                    .of_match_table = of_match_ptr(max8998_dt_match),
 368         },
 369         .probe = max8998_i2c_probe,
 370         .id_table = max8998_i2c_id,
 371 };
 372
 373 static int __init max8998_i2c_init(void)
 374 {
 375         return i2c_add_driver(&max8998_i2c_driver);
 376 }
 377 /* init early so consumer devices can complete system boot */
 378 subsys_initcall(max8998_i2c_init);